6.3.0.3

* docker: refactor

* github/docker: bump actions and adjust smp ports

.github/workflows/build.yml

@@ -63,7 +63,7 @@ jobs:
           mv $(cabal list-bin xftp) xftp-ubuntu-${{ matrix.platform_name}}
 
       - name: Build changelog
-        if: startsWith(github.ref, 'refs/tags/v') && matrix.os == 'ubuntu-22.04'
+        if: startsWith(github.ref, 'refs/tags/v')
         id: build_changelog
         uses: mikepenz/release-changelog-builder-action@v1
         with:

.github/workflows/docker-image.yml

@@ -14,22 +14,22 @@ jobs:
       matrix:
         include:
           - app: smp-server
-            app_port: 5223
+            app_port: "443 5223"
           - app: xftp-server
-            app_port: 443 
+            app_port: 443
     steps:
       - name: Clone project
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Log in to Docker Hub
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_PASSWORD }}
 
       - name: Extract metadata for Docker image
         id: meta
-        uses: docker/metadata-action@v4
+        uses: docker/metadata-action@v5
         with:
           images: ${{ secrets.DOCKERHUB_USERNAME }}/${{ matrix.app }}
           flavor: |
@@ -40,7 +40,7 @@ jobs:
             type=semver,pattern=v{{major}}
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v6
         with:
           push: true
           build-args: |

CHANGELOG.md

@@ -1,3 +1,117 @@
+# 6.2.2
+
+SMP server:
+- add optional Prometheus metrics (#1411).
+
+Build:
+- remove three modules from client library.
+
+# 6.2.0
+
+Version 6.2.0.7
+
+Build:
+- client_library flag to build only used modules in the clients, remove package yaml
+
+SMP server:
+- journal storage for messages (BETA).
+- prevent race condition when deleting queue and to avoid "orphan" messages (#1395).
+
+SMP agent:
+- support SMP and XFTP server roles (storage/proxy) and operators (#1343).
+- treat blocked STM and other critical errors that offer restart as temporary for message delivery (#1405).
+- fix inconsistent state after app restart while accepting contact request (#1412).
+
+# 6.1.3
+
+SMP server: fix restoring notification credentials.
+
+# 6.1.2
+
+Servers: more reliable restoring of state.
+
+SMP server: reduced memory usage and faster start.
+
+Notifications: compensate for iOS notifications being droppted by Apple while device is offline (#1378):
+- Ntf server: send multiple SMP notifications in one iOS notification.
+- Agent: get multiple messages for one iOS notification.
+
+# 6.1.1
+
+SMP:
+- stop server faster (#1371)
+- add STORE error (#1372)
+
+# 6.1.0
+
+Version 6.1.0.7
+
+SMP server and client:
+- transport block encryption (#1317).
+
+Agent:
+- batch and optimize iOS notifications processing (#1308, #1311, #1313, #1316, #1330, #1331, #1333, #1337, #1346).
+- allow receiving multiple messages from single iOS notification (#1355, #1362).
+- prepare connection to accept to avoid race condition with events (#1365).
+- transport isolation mode "Session" (default) to use new SOCKS credentials when client restarts or SOCKS proxy configuration changes (#1321).
+
+Ntf server:
+- control port (#1354).
+- enable pings on ntf subscriptions, to resubscribe on reconnection (#1353).
+
+SMP server:
+- support multiple server ports (#1319).
+- support serving HTTPS and SMP transport on the same port (#1326, #1327).
+- persist iOS notifications to avoid losing them when Ntf server is offline (#1336, #1339, #1350).
+- fix lost notification subscriptions (#1347).
+- reject SKEY with different key earlier, at verification step (#1366).
+- pass server information via CLI during server initialization (#1356).
+- show version on server page (#1341).
+- explicit graceful shutdown on SIGINT (#1360).
+
+XRCP (remote access protocol):
+- use SHA3-256 in hybrid key agreement (#1302).
+- session encryption with forward secrecy (#1328).
+
+# 6.0.5
+
+SMP agent:
+- support generic SOCKS proxy (without isolate-by-auth).
+- reduce max message sizes
+
+# 6.0.4
+
+SMP server:
+- better performance/memory: fewer map updates on re-subscriptions (#1297), split and reduce STM transactions (#1294)
+- send DELD when subscribed queue is deleted (#1312)
+- add created/updated/used date to queues to manage expiration (#1306)
+
+XFTP server: truncate file creation time to 1 hour (#1310)
+
+Servers:
+- bind control port only to 127.0.0.1 for better security in case of firewall misconfiguration (#1280)
+- reduce memory used for period stats (#1298)
+
+Agent: process last notification from list (#1307)
+- report receive file error with redirected file ID, when redirect is present (#1304)
+- special error when deleted user record is not in database (#1303)
+- fix race when sending a message to the deleted connection (#1296)
+- support for multiple messages in a single notification
+
+Ntf server:
+- only use SOCKS proxy for servers without public address (#1314)
+
+# 6.0.3
+
+Agent:
+- fix possible stuck queue rotation (#1290).
+
+SMP server:
+- batch END responses when subscribed client switches to reduce server and client traffic.
+- reduce STM transactions for better performance.
+- add stats for END events and for SUB/DEL event batches.
+- remove "expensive" stats to save memory.
+
 # 6.0.2
 
 SMP agent:

Dockerfile

@@ -1,15 +1,20 @@
-ARG TAG=22.04
+# syntax=docker/dockerfile:1.7.0-labs
+ARG TAG=24.04
 
 FROM ubuntu:${TAG} AS build
 
 ### Build stage
 
 # Install curl and git and simplexmq dependencies
-RUN apt-get update && apt-get install -y curl git build-essential libgmp3-dev zlib1g-dev llvm-12 llvm-12-dev libnuma-dev libssl-dev
+RUN apt-get update && apt-get install -y curl git build-essential libgmp3-dev zlib1g-dev llvm-18 llvm-18-dev libnuma-dev libssl-dev
 
 # Specify bootstrap Haskell versions
 ENV BOOTSTRAP_HASKELL_GHC_VERSION=9.6.3
-ENV BOOTSTRAP_HASKELL_CABAL_VERSION=3.10.1.0
+ENV BOOTSTRAP_HASKELL_CABAL_VERSION=3.12.1.0
+
+# Do not install Stack
+ENV BOOTSTRAP_HASKELL_INSTALL_NO_STACK=true
+ENV BOOTSTRAP_HASKELL_INSTALL_NO_STACK_HOOK=true
 
 # Install ghcup
 RUN curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | BOOTSTRAP_HASKELL_NONINTERACTIVE=1 sh
@@ -21,26 +26,42 @@ ENV PATH="/root/.cabal/bin:/root/.ghcup/bin:$PATH"
 RUN ghcup set ghc "${BOOTSTRAP_HASKELL_GHC_VERSION}" && \
     ghcup set cabal "${BOOTSTRAP_HASKELL_CABAL_VERSION}"
 
-COPY . /project
+# Copy only the source code
+COPY apps /project/apps/
+COPY cbits /project/cbits/
+COPY src /project/src/
+
+COPY cabal.project Setup.hs simplexmq.cabal LICENSE /project
+
 WORKDIR /project
 
+# Debug
+#ARG CACHEBUST=1
+
+#ADD --chmod=755 https://github.com/MShekow/directory-checksum/releases/download/v1.4.6/directory-checksum_1.4.6_linux_amd64 /usr/local/bin/directory-checksum
+#RUN directory-checksum --max-depth 2 .
+
+# Set build arguments and check if they exist
 ARG APP
-ARG APP_PORT
-RUN if [ -z "$APP" ] || [ -z "$APP_PORT" ]; then printf "Please spcify \$APP and \$APP_PORT build-arg.\n"; exit 1; fi
+RUN if [ -z "$APP" ]; then printf "Please spcify \$APP build-arg.\n"; exit 1; fi
 
 # Compile app
 RUN cabal update
 RUN cabal build exe:$APP
 
+# Copy scripts
+COPY scripts /project/scripts/
+
 # Create new path containing all files needed
 RUN mkdir /final
 WORKDIR /final
 
 # Strip the binary from debug symbols to reduce size
-RUN bin=$(find /project/dist-newstyle -name "$APP" -type f -executable) && \
+RUN bin="$(find /project/dist-newstyle -name "$APP" -type f -executable)" && \
     mv "$bin" ./ && \
     strip ./"$APP" &&\
-    mv /project/scripts/docker/entrypoint-"$APP" ./entrypoint
+    mv /project/scripts/docker/entrypoint-"$APP" ./entrypoint &&\
+    mv /project/scripts/main/simplex-servers-stopscript ./simplex-servers-stopscript
 
 ### Final stage
 FROM ubuntu:${TAG}
@@ -53,6 +74,8 @@ COPY --from=build /final /usr/local/bin/
 
 # Open app listening port
 ARG APP_PORT
+RUN if [ -z "$APP_PORT" ]; then printf "Please spcify \$APP_PORT build-arg.\n"; exit 1; fi
+
 EXPOSE $APP_PORT
 
 # simplexmq requires using SIGINT to correctly preserve undelivered messages and restore them on restart

README.md

@@ -149,8 +149,15 @@ On Linux, you can deploy smp and xftp server using Docker. This will download im
 You can install and setup servers automatically using our script:
 
 ```sh
-curl --proto '=https' --tlsv1.2 -sSf https://raw.githubusercontent.com/simplex-chat/simplexmq/stable/install.sh -o simplex-server-install.sh \
-&& if echo 'c90886104cd640b2ed64921dba80e90691db36788e8d6dcc13d8f33f92f0ea54 simplex-server-install.sh' | sha256sum -c; then chmod +x ./simplex-server-install.sh && ./simplex-server-install.sh; rm ./simplex-server-install.sh; else echo "SHA-256 checksum is incorrect!" && rm ./simplex-server-install.sh; fi
+curl --proto '=https' --tlsv1.2 -sSf https://raw.githubusercontent.com/simplex-chat/simplexmq/stable/install.sh -o simplex-server-install.sh &&\
+if echo '53fcdb4ceab324316e2c4cda7e84dbbb344f32550a65975a7895425e5a1be757 simplex-server-install.sh' | sha256sum -c; then
+  chmod +x ./simplex-server-install.sh
+  ./simplex-server-install.sh
+  rm ./simplex-server-install.sh
+else
+  echo "SHA-256 checksum is incorrect!"
+  rm ./simplex-server-install.sh
+fi
 ```
 
 ### Build from source

apps/ntf-server/Main.hs

@@ -15,7 +15,7 @@ logCfg = LogConfig {lc_file = Nothing, lc_stderr = True}
 
 main :: IO ()
 main = do
-  setLogLevel LogDebug -- change to LogError in production
+  setLogLevel LogInfo
   cfgPath <- getEnvPath "NTF_SERVER_CFG_PATH" defaultCfgPath
   logPath <- getEnvPath "NTF_SERVER_LOG_PATH" defaultLogPath
   withGlobalLogging logCfg $ ntfServerCLI cfgPath logPath

apps/smp-server/Main.hs

@@ -19,4 +19,4 @@ main = do
   setLogLevel LogDebug
   cfgPath <- getEnvPath "SMP_SERVER_CFG_PATH" defaultCfgPath
   logPath <- getEnvPath "SMP_SERVER_LOG_PATH" defaultLogPath
-  withGlobalLogging logCfg $ smpServerCLI_ Static.generateSite Static.serveStaticFiles cfgPath logPath
+  withGlobalLogging logCfg $ smpServerCLI_ Static.generateSite Static.serveStaticFiles Static.attachStaticFiles cfgPath logPath

apps/smp-server/static/index.html

@@ -221,6 +221,10 @@
               Public information
             </h2>
             <table id="public-info">
+              <tr class="text-grey-black dark:text-white text-base">
+                <td>Server version:</td>
+                <td>${version}</td>
+              </tr>
               <tr class="text-grey-black dark:text-white text-base">
                 <td>Source code:</td>
                 <td><a href="${sourceCode}" target="_blank">${sourceCode}</a></td>
@@ -291,6 +295,12 @@
                   <td>${hostingEntity} (${hostingCountry})</td>
                 </tr>
               </x-hosting>
+              <x-hostingType>
+                <tr class="text-grey-black dark:text-white text-base">
+                  <td>Hosting type:</td>
+                  <td>${hostingType}</td>
+                </tr>
+              </x-hostingType>
               <x-serverCountry>
                 <tr class="text-grey-black dark:text-white text-base">
                   <td>Server country:</td>

apps/smp-server/web/Static.hs

@@ -7,22 +7,30 @@ module Static where
 import Control.Logger.Simple
 import Control.Monad
 import Data.ByteString (ByteString)
-import qualified Data.ByteString as B
+import qualified Data.ByteString.Char8 as B
+import Data.Char (toUpper)
+import Data.IORef (readIORef)
 import Data.Maybe (fromMaybe)
 import Data.String (fromString)
 import Data.Text.Encoding (encodeUtf8)
-import Network.Wai.Application.Static as S
-import Network.Wai.Handler.Warp as W
-import qualified Network.Wai.Handler.WarpTLS as W
+import Network.Socket (getPeerName)
+import Network.Wai (Application)
+import qualified Network.Wai.Application.Static as S
+import qualified Network.Wai.Handler.Warp as W
+import qualified Network.Wai.Handler.Warp.Internal as WI
+import qualified Network.Wai.Handler.WarpTLS as WT
 import Simplex.Messaging.Encoding.String (strEncode)
+import Simplex.Messaging.Server (AttachHTTP)
 import Simplex.Messaging.Server.Information
 import Simplex.Messaging.Server.Main (EmbeddedWebParams (..), WebHttpsParams (..))
+import Simplex.Messaging.Transport (simplexMQVersion)
 import Simplex.Messaging.Transport.Client (TransportHost (..))
 import Simplex.Messaging.Util (tshow)
 import Static.Embedded as E
 import System.Directory (createDirectoryIfMissing)
 import System.FilePath
 import UnliftIO.Concurrent (forkFinally)
+import UnliftIO.Exception (bracket, finally)
 
 serveStaticFiles :: EmbeddedWebParams -> IO ()
 serveStaticFiles EmbeddedWebParams {webStaticPath, webHttpPort, webHttpsParams} = do
@@ -31,9 +39,44 @@ serveStaticFiles EmbeddedWebParams {webStaticPath, webHttpPort, webHttpsParams}
     W.runSettings (mkSettings port) (S.staticApp $ S.defaultFileServerSettings webStaticPath)
   forM_ webHttpsParams $ \WebHttpsParams {port, cert, key} -> flip forkFinally (\e -> logError $ "HTTPS server crashed: " <> tshow e) $ do
     logInfo $ "Serving static site on port " <> tshow port <> " (TLS)"
-    W.runTLS (W.tlsSettings cert key) (mkSettings port) (S.staticApp $ S.defaultFileServerSettings webStaticPath)
+    WT.runTLS (WT.tlsSettings cert key) (mkSettings port) app
   where
-    mkSettings port = setPort port defaultSettings
+    app = staticFiles webStaticPath
+    mkSettings port = W.setPort port warpSettings
+
+-- | Prepare context and prepare HTTP handler for TLS connections that already passed TLS.handshake and ALPN check.
+attachStaticFiles :: FilePath -> (AttachHTTP -> IO ()) -> IO ()
+attachStaticFiles path action =
+  -- Initialize global internal state for http server.
+  WI.withII warpSettings $ \ii -> do
+    action $ \socket cxt -> do
+      -- Initialize internal per-connection resources.
+      addr <- getPeerName socket
+      withConnection addr cxt $ \(conn, transport) ->
+        withTimeout ii conn $ \th ->
+          -- Run Warp connection handler to process HTTP requests for static files.
+          WI.serveConnection conn ii th addr transport warpSettings app
+  where
+    app = staticFiles path
+    -- from warp-tls
+    withConnection socket cxt = bracket (WT.attachConn socket cxt) (terminate . fst)
+    -- from warp
+    withTimeout ii conn =
+      bracket
+        (WI.registerKillThread (WI.timeoutManager ii) (WI.connClose conn))
+        WI.cancel
+    -- shared clean up
+    terminate conn = WI.connClose conn `finally` (readIORef (WI.connWriteBuffer conn) >>= WI.bufFree)
+
+warpSettings :: W.Settings
+warpSettings = W.setGracefulShutdownTimeout (Just 1) W.defaultSettings
+
+staticFiles :: FilePath -> Application
+staticFiles root = S.staticApp settings
+  where
+    settings = (S.defaultFileServerSettings root)
+      { S.ssListing = Nothing
+      }
 
 generateSite :: ServerInformation -> Maybe TransportHost -> FilePath -> IO ()
 generateSite si onionHost sitePath = do
@@ -78,6 +121,7 @@ serverInformation ServerInformation {config, information} onionHost = render E.i
       where
         basic =
           [ ("sourceCode", Just . encodeUtf8 $ sourceCode spi),
+            ("version", Just $ B.pack simplexMQVersion),
             ("website", encodeUtf8 <$> website spi)
           ]
         conds ServerConditions {conditions, amendments} =
@@ -109,7 +153,8 @@ serverInformation ServerInformation {config, information} onionHost = render E.i
             ("hostingCountry", encodeUtf8 <$> country)
           ]
         server =
-          [ ("serverCountry", fmap encodeUtf8 $ serverCountry =<< information)
+          [ ("serverCountry", encodeUtf8 <$> serverCountry spi),
+            ("hostingType",  (\s -> maybe s (\(c, rest) -> toUpper c `B.cons` rest) $ B.uncons s) . strEncode <$> hostingType spi)
           ]
 
 -- Copy-pasted from simplex-chat Simplex.Chat.Types.Preferences

cabal.project

@@ -4,6 +4,14 @@ packages: .
 -- packages: . ../http2
 -- packages: . ../network-transport
 
+-- package *
+   -- coverage: True
+   -- library-coverage: True
+
+-- package attoparsec
+   -- coverage: False
+   -- library-coverage: False
+
 index-state: 2023-12-12T00:00:00Z
 
 package cryptostore
@@ -28,3 +36,17 @@ source-repository-package
     type: git
     location: https://github.com/simplex-chat/sqlcipher-simple.git
     tag: a46bd361a19376c5211f1058908fc0ae6bf42446
+
+-- waiting for published warp-tls-3.4.7
+source-repository-package
+    type: git
+    location: https://github.com/yesodweb/wai.git
+    tag: ec5e017d896a78e787a5acea62b37a4e677dec2e
+    subdir: warp-tls
+
+-- backported fork due http-5.0
+source-repository-package
+    type: git
+    location: https://github.com/simplex-chat/wai.git
+    tag: 2f6e5aa5f05ba9140ac99e195ee647b4f7d926b0
+    subdir: warp

install.sh

@@ -2,9 +2,6 @@
 set -eu
 
 # Links to scripts/configs
-bin="https://github.com/simplex-chat/simplexmq/releases/latest/download"
-remote_version="$(curl --proto '=https' --tlsv1.2 -sSf -L https://api.github.com/repos/simplex-chat/simplexmq/releases/latest | grep -i "tag_name" | awk -F \" '{print $4}')"
-
 scripts="https://raw.githubusercontent.com/simplex-chat/simplexmq/stable/scripts/main"
 scripts_systemd_smp="$scripts/smp-server.service"
 scripts_systemd_xftp="$scripts/xftp-server.service"
@@ -57,7 +54,7 @@ ${GRN}1.${NC} Install latest binaries from GitHub releases:
 ${GRN}2.${NC} Create server directories:
     - smp: ${YLW}${path_conf_smp}${NC}
     - xftp: ${YLW}${path_conf_xftp}${NC}
-${GRN}3.${NC} Setup user for each server:
+${GRN}3.${NC} Setup user for server:
     - xmp: ${YLW}${user_smp}${NC}
     - xftp: ${YLW}${user_xftp}${NC}
 ${GRN}4.${NC} Create systemd services:
@@ -67,9 +64,8 @@ ${GRN}5.${NC} Install stopscript (systemd), update and uninstallation script:
     - all: ${YLW}${path_bin_update}${NC}, ${YLW}${path_bin_uninstall}${NC}, ${YLW}${path_bin_stopscript}${NC}
 
 Press:
-  - ${GRN}ENTER${NC} to continue installing both xftp and smp servers
-  - ${GRN}1${NC} to install only smp server
-  - ${GRN}2${NC} to install only xftp server
+  - ${GRN}1${NC} to install smp server
+  - ${GRN}2${NC} to install xftp server
   - ${RED}Ctrl+C${NC} to cancel installation
   
 Selection: "
@@ -83,6 +79,21 @@ Please checkout our server guides:
 To uninstall with full clean-up, simply run: ${YLW}sudo /usr/local/bin/simplex-servers-uninstall${NC}
 "
 
+set_version() {
+  ver="${VER:-latest}"
+
+  case "$ver" in 
+    latest)
+      bin="https://github.com/simplex-chat/simplexmq/releases/latest/download"
+      remote_version="$(curl --proto '=https' --tlsv1.2 -sSf -L https://api.github.com/repos/simplex-chat/simplexmq/releases/latest | grep -i "tag_name" | awk -F \" '{print $4}')"
+      ;;
+    *)
+      bin="https://github.com/simplex-chat/simplexmq/releases/download/${ver}"
+      remote_version="${ver}"
+      ;;
+  esac
+}
+
 os_test() {
  . /etc/os-release
 
@@ -155,6 +166,7 @@ checks() {
   exit 1
  fi
  
+ set_version
  os_test
 
  mkdir -p $path_conf_info  
@@ -166,13 +178,11 @@ main() {
  printf "%b\n%b" "${BLU}$logo${NC}" "$welcome"
  read ans
 
- if [ "$ans" = '1' ]; then
-  setup='smp'
- elif [ "$ans" = '2' ]; then
-  setup='xftp'
- else
-  setup='smp xftp'
- fi
+ case "$ans" in
+  1) setup='smp' ;;
+  2) setup='xftp' ;;
+  *) printf 'Installation aborted.\n' && exit 0 ;;
+ esac
 
  printf "Installing binaries..."
  

package.yaml

@@ -1,211 +0,0 @@
-name: simplexmq
-version: 6.0.2.0
-synopsis: SimpleXMQ message broker
-description: |
-  This package includes <./docs/Simplex-Messaging-Server.html server>,
-  <./docs/Simplex-Messaging-Client.html client> and
-  <./docs/Simplex-Messaging-Agent.html agent> for SMP protocols:
-  .
-  * <https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md SMP protocol>
-  * <https://github.com/simplex-chat/simplexmq/blob/master/protocol/agent-protocol.md SMP agent protocol>
-  .
-  See <https://github.com/simplex-chat/simplex-chat terminal chat prototype> built with SimpleXMQ broker.
-
-homepage: https://github.com/simplex-chat/simplexmq#readme
-license: AGPL-3
-author: simplex.chat
-maintainer: chat@simplex.chat
-copyright: 2020-2022 simplex.chat
-category: Chat, Network, Web, System, Cryptography
-extra-source-files:
-  - README.md
-  - CHANGELOG.md
-  - cbits/sha512.h
-  - cbits/sntrup761.h
-  - apps/smp-server/static/*.html
-  - apps/smp-server/static/media/*
-
-dependencies:
-  - aeson == 2.2.*
-  - ansi-terminal >= 0.10 && < 0.12
-  - asn1-encoding == 0.9.*
-  - asn1-types == 0.3.*
-  - async == 2.2.*
-  - attoparsec == 0.14.*
-  - base >= 4.14 && < 5
-  - base64-bytestring >= 1.0 && < 1.3
-  - case-insensitive == 1.2.*
-  - composition == 1.0.*
-  - constraints >= 0.12 && < 0.14
-  - containers == 0.6.*
-  - crypton == 0.34.*
-  - crypton-x509 == 1.7.*
-  - crypton-x509-store == 1.6.*
-  - crypton-x509-validation == 1.6.*
-  - cryptostore == 0.3.*
-  - data-default == 0.7.*
-  - direct-sqlcipher == 2.3.*
-  - directory == 1.3.*
-  - filepath == 1.4.*
-  - hourglass == 0.2.*
-  - http-types == 0.12.*
-  - http2 >= 4.2.2 && < 4.3
-  - ini == 0.4.1
-  - iproute == 1.7.*
-  - iso8601-time == 0.1.*
-  - memory == 0.18.*
-  - mtl >= 2.3.1 && < 3.0
-  - network >= 3.1.2.7 && < 3.2
-  - network-info >= 0.2 && < 0.3
-  - network-transport == 0.5.6
-  - network-udp >= 0.0 && < 0.1
-  - optparse-applicative >= 0.15 && < 0.17
-  - process == 1.6.*
-  - random >= 1.1 && < 1.3
-  - simple-logger == 0.1.*
-  - socks == 0.6.*
-  - sqlcipher-simple == 0.4.*
-  - stm == 2.5.*
-  - temporary == 1.3.*
-  - time == 1.12.*
-  - time-manager == 0.0.*
-  - tls >= 1.9.0 && < 1.10
-  - transformers == 0.6.*
-  - unliftio == 0.2.*
-  - unliftio-core == 0.2.*
-  - websockets == 0.12.*
-  - yaml == 0.11.*
-  - zstd == 0.1.3.*
-
-flags:
-  swift:
-    description: Enable swift JSON format
-    manual: True
-    default: False
-  use_crypton:
-    description: Use crypton etc. in cryptostore
-    manual: True
-    default: True
-
-# cpp-options:
-#   - -Dslow_servers
-
-when:
-  - condition: flag(swift)
-    cpp-options:
-      - -DswiftJSON
-  - condition: impl(ghc >= 9.6.2)
-    dependencies:
-      - bytestring == 0.11.*
-      - template-haskell == 2.20.*
-      - text >= 2.0.1 && < 2.2
-  - condition: impl(ghc < 9.6.2)
-    dependencies:
-      - bytestring == 0.10.*
-      - template-haskell == 2.16.*
-      - text >= 1.2.3.0 && < 1.3
-
-library:
-  source-dirs: src
-  c-sources:
-    - cbits/sha512.c
-    - cbits/sntrup761.c
-  include-dirs: cbits
-  extra-libraries: crypto
-
-executables:
-  smp-server:
-    source-dirs:
-    - apps/smp-server
-    - apps/smp-server/web
-    main: Main.hs
-    dependencies:
-      - file-embed
-      - simplexmq
-      - wai-app-static
-      - warp
-      - warp-tls
-    ghc-options:
-      - -threaded
-      - -rtsopts
-
-  ntf-server:
-    source-dirs: apps/ntf-server
-    main: Main.hs
-    dependencies:
-      - simplexmq
-    ghc-options:
-      - -threaded
-      - -rtsopts
-
-  xftp-server:
-    source-dirs: apps/xftp-server
-    main: Main.hs
-    dependencies:
-      - simplexmq
-    ghc-options:
-      - -threaded
-      - -rtsopts
-
-  xftp:
-    source-dirs: apps/xftp
-    main: Main.hs
-    dependencies:
-      - simplexmq
-    ghc-options:
-      - -threaded
-      - -rtsopts
-
-tests:
-  simplexmq-test:
-    source-dirs: tests
-    main: Test.hs
-    dependencies:
-      - simplexmq
-      - deepseq == 1.4.*
-      - generic-random == 1.5.*
-      - hspec == 2.11.*
-      - hspec-core == 2.11.*
-      - HUnit == 1.6.*
-      - QuickCheck == 2.14.*
-      - silently == 1.2.*
-      - main-tester == 0.2.*
-      - timeit == 2.0.*
-    ghc-options:
-      - -threaded
-      - -rtsopts
-      - -with-rtsopts=-A64M
-      - -with-rtsopts=-N1
-
-ghc-options:
-  # - -haddock
-  - -Weverything
-  - -Wno-missing-exported-signatures
-  - -Wno-missing-import-lists
-  - -Wno-missed-specialisations
-  - -Wno-all-missed-specialisations
-  - -Wno-unsafe
-  - -Wno-safe
-  - -Wno-missing-local-signatures
-  - -Wno-missing-kind-signatures
-  - -Wno-missing-deriving-strategies
-  - -Wno-monomorphism-restriction
-  - -Wno-prepositive-qualified-module
-  - -Wno-unused-packages
-  - -Wno-implicit-prelude
-  - -Wno-missing-safe-haskell-mode
-  - -Wno-missing-export-lists
-  - -Wno-partial-fields
-  - -Wcompat
-  - -Werror=incomplete-record-updates
-  - -Werror=incomplete-patterns
-  - -Werror=incomplete-uni-patterns
-  - -Werror=missing-methods
-  - -Werror=tabs
-  - -Wredundant-constraints
-  - -Wincomplete-record-updates
-  - -Wunused-type-patterns
-  - -O2
-
-default-extensions:
-  - StrictData

protocol/xftp.md

@@ -559,11 +559,13 @@ In current implementation of XFTP protocol in SimpleX Chat clients don't use FAC
 
  - perform traffic correlation attacks against senders and recipients and correlate senders and recipients within the monitored set, frustrated by the number of users on the servers.
 
- - observe how much traffic is being sent, and make guesses as to its purpose
+ - observe how much traffic is being sent, and make guesses as to its purpose.
 
-*cannot, even in case of a compromised transport protocol:*
+ - in case of a compromised transport protocol, correlate file senders and receivers.
 
- - perform traffic correlation attacks with any increase in efficiency over a non-compromised transport protocol
+*cannot, in case of a non-compromised transport protocol:*
+
+ - perform traffic correlation attacks.
 
 #### XFTP server
 

protocol/xrcp.md

@@ -67,7 +67,7 @@ The session invitation contains this data:
 - CA TLS certificate fingerprint of the controller - this is part of long term identity of the controller established during the first session, and repeated in the subsequent session announcements.
 - Session Ed25519 public key used to verify the announcement and commands - this mitigates the compromise of the long term signature key, as the controller will have to sign each command with this key first.
 - Long-term Ed25519 public key used to verify the announcement and commands - this is part of the long term controller identity.
-- Session X25519 DH key and SNTRUP761 KEM encapsulation key to agree session encryption (both for multicast announcement and for commands and responses in TLS), as described in https://datatracker.ietf.org/doc/draft-josefsson-ntruprime-hybrid/. The new keys are used for each session, and if client key is already available (from the previous session), the computed shared secret will be used to encrypt the announcement multicast packet. The out-of-band invitation is unencrypted. DH public key and KEM encapsulation key are sent unencrypted. NaCL crypto_box is used for encryption.
+- Session X25519 DH key to agree session encryption (both for multicast announcement and for commands and responses in TLS), as described in https://datatracker.ietf.org/doc/draft-josefsson-ntruprime-hybrid/. The new keys are used for each session, and if client key is already available (from the previous session), the computed shared secret will be used to encrypt the announcement multicast packet. The out-of-band invitation is unencrypted. DH public key and KEM encapsulation key are sent unencrypted. NaCL crypto_box is used for encryption.
 
 Host application decrypts (except the first session) and validates the invitation:
 - Session signature is valid.
@@ -184,7 +184,7 @@ The controller decrypts (including the first session) and validates the received
 The controller should reply with with `ctrlHello` or `ctrlError` response:
 
 ```abnf
-ctrlHello = %s"HELLO " kemCiphertext nonce encrypted(unpaddedSize ctrlHelloJSON helloPad) pad
+ctrlHello = %s"HELLO " kemCiphertext encrypted(unpaddedSize ctrlHelloJSON helloPad) pad
 ; ctrlHelloJSON is encrypted with the hybrid secret,
 ; including both previously agreed DH secret and KEM secret from kemCiphertext
 unpaddedSize = largeLength
@@ -206,6 +206,8 @@ JTD schema for the encrypted part of controller HELLO block `ctrlHelloJSON`:
 }
 ```
 
+Controller `hello` block and all subsequent protocol messages are encrypted with the chain keys derived from the hybrid key (see key exchange below) - that is why conntroller hello block does not include nonce. That provides forward secrecy within the XRCP session. Receiving this `hello` block allows host to compute the same hybrid keys and to derive the same chain keys.
+
 Once the controller replies HELLO to the valid host HELLO block, it should stop accepting new TCP connections.
 
 ### Controller/host session operation
@@ -223,10 +225,12 @@ tlsunique channel binding from TLS session MUST be included in commands (include
 The syntax for encrypted command and response body encoding:
 
 ```abnf
-commandBody = encBody sessSignature idSignature [attachment]
-responseBody = encBody [attachment] ; counter must match command
-encBody = nonce encLength32 encrypted(tlsunique counter body)
-attachment = %x01 nonce encLength32 encrypted(attachment)
+commandBody = counter encBody sessSignature idSignature [attachment]
+responseBody = counter encBody [attachment] ; counter must match command
+; counter is placed outside of encrypted body to allow correlating encryption keys
+; with the chain keys (each command and response are encrypted by different keys)
+encBody = encLength32 encrypted(tlsunique body)
+attachment = %x01 encLength32 encrypted(attachment)
 noAttachment = %x00
 tlsunique = length 1*OCTET
 counter = 8*8 OCTET ; int64
@@ -239,7 +243,7 @@ If the command or response includes attachment, its hash must be included in com
 
 Initial announcement is shared out-of-band (URI with xrcp scheme), and it is not encrypted.
 
-This announcement contains only DH keys, as KEM key is too large to include in QR code, which are used to agree encryption key for host HELLO block. The host HELLO block will contain DH key in plaintext part and KEM encapsulation (public) key in encrypted part, that will be used to determine the shared secret (using SHA256 over concatenated DH shared secret and KEM encapsulated secret) both for controller HELLO response (that contains KEM ciphertext in plaintext part) and subsequent session commands and responses.
+This announcement contains only DH keys, as KEM key is too large to include in QR code, which are used to agree encryption key for host HELLO block. The host HELLO block will contain DH key in plaintext part and KEM encapsulation (public) key in encrypted part, that will be used to determine the shared secret (using SHA3-256 over concatenated DH shared secret and KEM encapsulated secret) to derive keys for controller HELLO response (that contains KEM ciphertext in plaintext part) and subsequent session commands and responses.
 
 During the next session the announcement is sent via encrypted multicast block. The shared key for this announcement and for host HELLO block is determined using the KEM shared secret from the previous session and DH shared secret computed using the host DH key from the previous session and the new controller DH key from the announcement.
 
@@ -250,7 +254,7 @@ In pseudo-code:
 ```
 // session 1
 hostHelloSecret(1) = dhSecret(1)
-sessionSecret(1) = sha256(dhSecret(1) || kemSecret(1)) // to encrypt session 1 data, incl. controller hello
+sessionSecret(1) = sha3-256(dhSecret(1) || kemSecret(1)) // to encrypt session 1 data, incl. controller hello
 dhSecret(1) = dh(hostHelloDhKey(1), controllerInvitationDhKey(1))
 kemCiphertext(1) = enc(kemSecret(1), kemEncKey(1))
 // kemEncKey is included in host HELLO, kemCiphertext - in controller HELLO
@@ -262,7 +266,7 @@ dhSecret(n') = dh(hostHelloDhKey(n - 1), controllerDhKey(n))
 
 // session n
 hostHelloSecret(n) = dhSecret(n)
-sessionSecret(n) = sha256(dhSecret(n) || kemSecret(n)) // to encrypt session n data, incl. controller hello
+sessionSecret(n) = sha3-256(dhSecret(n) || kemSecret(n)) // to encrypt session n data, incl. controller hello
 dhSecret(n) = dh(hostHelloDhKey(n), controllerDhKey(n))
 // controllerDhKey(n) is either from invitation or from multicast announcement
 kemCiphertext(n) = enc(kemSecret(n), kemEncKey(n))
@@ -273,6 +277,22 @@ If controller fails to store the new host DH key after receiving HELLO block, th
 
 To decrypt a multicast announcement, the host should try to decrypt it using the keys of all known (paired) remote controllers.
 
+Once kemSecret is agreed for the session, it is used to derive two chain keys, to receive and to send messages:
+
+```
+host: sndKey, rcvKey = HKDF(kemSecret, "SimpleXSbChainInit", 64)
+controller: rcvKey, sndKey  = HKDF(kemSecret, "SimpleXSbChainInit", 64)
+```
+
+where HKDF is based on SHA512, with empty salt.
+
+Actual keys and nonces to encrypt and decrypt messages are derived from these chain keys:
+
+```
+to send: (sndKey', sk, nonce) = HKDF(sndKey, "SimpleXSbChain", 88)
+to receive: (rcvKey', sk, nonce) = HKDF(rcvKey, "SimpleXSbChain", 88)
+```
+
 ## Threat model
 
 #### A passive network adversary able to monitor the site-local traffic:

rfcs/2024-06-21-short-links.md

@@ -0,0 +1,124 @@
+# Short invitation links
+
+## Problem
+
+Long links look scary and unsafe for many users. While this is a perceived problem, rather than a real one, it hurts adoption.
+
+What is worse, long links do not fit in profile descriptions of other social networks where people might want to advertize their contact addresses.
+
+The current link size limitation is also the reason for not including PQ KEM keys into invitation links and addresses, postponing the moment when PQ-resistant encryption kicks in - if we include PQ KEM key into the link, the QR code will not be scannable.
+
+Additionally, if we store short links, they can also include chat preferences and public profile data.
+
+## Solution
+
+MITM-resistant link shortening.
+
+Instead of generating the random address that would resolve into the link - doing so would create the possibility of MITM by the server hosting this link - we can use private key as the link ID that will be passed to the accepting party, and the hash of the public key as ID for the server - the accepting party would present this key itself as ID and it will also be used for server to client encryption (see Protocol below). HKDF will be used to derive symmetric key from private key and used in secret_box together with random nonce (to allow replacing data with the same key but with a different nonce - nonce will be sent to the server too). secret_box construction is authenticated encryption, so it would protect from MITM.
+
+The proposed syntax:
+
+```abnf
+shortConnectionRequest = connectionScheme "/" connReqType "#/" smpServer "/" linkHash
+connReqType = %s"invitation" / %s"contact"
+connectionScheme = (%s"https://" clientAppServer) / %s"simplex:"
+clientAppServer = hostname [ ":" port ]
+  ; client app server, e.g. simplex.chat
+smpServer = serverIdentity "@" srvHosts [":" port] ; no smp:// prefix, no escaping
+srvHosts = <hostname> ["," srvHosts] ; RFC1123, RFC5891
+linkHash = <base64url encoded SHA256 or SHA512 hash of the original link>
+```
+
+If SMP server supports pages, its name can be used as clientAppServer, without repeating it after #, for a shorter link.
+
+Example link:
+
+```
+https://simplex.chat/contact/#0YuTwO05YJWS8rkjn9eLJDjQhFKvIYd8d4xG8X1blIU=@smp8.simplex.im/abcdefghij0123456789abcdefghij0123456789abc=
+```
+
+This link has the length of ~136 characters (256 bits), which is shorter than the full contact address (~310 characters) and much shorter than invitation links (~528 characters) even without post-quantum keys added to them.
+
+This size can be further reduced by
+- use server domain in the link.
+- do not include onion address, as the connection happens via proxy anyway, if it's untrusted server.
+- not pinning server TLS certificate - the downside here is that while the attack that compromises TLS will not be able to substitute the link (because it's hash will not match), it will be able to intercept and to block it.
+- using shorter hash, e.g. SHA128 - reducing the collision resistance.
+
+If the server is known, the client could use it's hash and onion address, otherwise it could trust the proxy to use any existing session with the same hostname or to accept the risk of interception - given that there is no risk of substitution.
+
+With the first two of these "improvements" the link could be ~122 characters:
+
+```
+https://smp8.simplex.im/contact/#0YuTwO05YJWS8rkjn9eLJDjQhFKvIYd8d4xG8X1blIU@/abcdefghij0123456789abcdefghij0123456789abc
+```
+
+If onion address is preserved the link will be ~184 characters (won't fit in Twitter 160 characters bio):
+
+```
+https://smp8.simplex.im/contact/#0YuTwO05YJWS8rkjn9eLJDjQhFKvIYd8d4xG8X1blIU@beccx4yfxxbvyhqypaavemqurytl6hozr47wfc7uuecacjqdvwpw2xid.onion/abcdefghij0123456789abcdefghij0123456789abc
+```
+
+If we implement it, the request to resolve the link would be made via proxied SMP command (to avoid the direct connection between the client and the recipient's server).
+
+Pros:
+- a bit shorter link.
+- possibility to include post-quantum keys into the full link keeping the same shortened link size.
+- possibility to include chat profile of contact or group, and preferences, for a much better connection experience, and to show this information when the link sent in the conversation (clients can resolve them automatically, without connecting - it can be resolved by the sending clients).
+- server will not have access to the link.
+
+Cons:
+- protocol complexity.
+- observers can access the link content, so for 1-time invitation we should only include permissions and not profile.
+
+Pros are a huge improvement of UX of connecting both within and from outside of the app (e.g., link can be resolved even before creating chat profile, as part of the onboarding).
+
+## Protocol
+
+To support short links, the SMP servers would provide a simple key-value store enabled by three additional commands: `WRT`, `CLR` and `READ`
+
+`WRT` command is used to store and to update values in the store. The size of the value is limited by the same size as sent messages (or, possibly, smaller - as connection information size used in confirmation messages) - the clients would use this fixed size irrespective of the content. `WRT` command will be sent with the data blob ID in the transaction entityId field, public authorization key used to authorize `WRT` and `CLR` commands (subsequent WRT commands to the existing key must use the same key), and the data blob.
+
+`CLR` command must use with the same entity ID and must be authorized by the same key.
+
+`READ` command must use the ID which hash would be equal of the ID used to create the data blob, and this ID would also be used as public authorization
+
+## Algorithm to store and to retrieve data blob.
+
+**Store data blob**
+
+- the data blob owner generates X25519 key pair: `(k, pk)`.
+- private key `pk` will be included in the short link shared with the other party (only base64url encoded key bytes, not X509 encoding).
+- `HKDF(pk)` will be used to encrypt the link data with secret_box before storing it on the server.
+- the hash of public key `sha256(k)` will be used as ID by the owner to store and to remove the data blob (`WRT` and `CLR` commands).
+
+**Retrieve data blob**
+
+- the sender uses the public key `k` derived from the private key `pk` included in the link as entity ID to retrieve data blob (the server will compute the ID used by the owner as `sha256(k)` and will be able to look it up). This provides the quality that the traffic of the parties has no shared IDs inside TLS. It also means that unlike message queue creation, the ID to retrieve the blob was never sent to the blob creator, and also is not known to the server in advance (the second part is only an observation, in itself it does not increase security, as server has access to an encrypted blob anyway).
+- note that the sender does not authorize the request to retrieve the blob, as it would not increase security unless a different key is used to authorize, and adding a key would increase link size.
+- server session keys with the sender will be `(sk, spk)`, where `sk` is public key shared with the sender during session handshake, and `spk` is the private key known only to the server.
+- this public key `k` will also be combined with server session key `spk` using `dh(k, spk)` to encrypt the response, so that there is no ciphertext in common in sent and received traffic for these blobs. Correlation ID will be used as a nonce for this encryption.
+- having received the blob, the client can now decrypt it using secret_box with `HKDF(pk)`.
+
+Using the same key as ID for the request, and also to additionally encrypt the response allows to use a single key in the link, without increasing the link size.
+
+## Threat model
+
+**Compromised SMP server**
+
+can:
+- delete link data.
+- hide link selectively from some requests.
+
+cannot:
+- undetectably replace link data.
+- access unencrypted link data, whether it was or was not accessed by the accepting party.
+- observe IP addresses of the users accessing link data.
+
+**Passive observer who observed short link**:
+
+can:
+- access original unencrypted link data
+
+cannot:
+- replace or delete the link data

rfcs/2024-07-06-ios-notifications.md

@@ -0,0 +1,18 @@
+# iOS notifications stability
+
+## Problem
+
+iOS notifications may fail to deliver for several reasons, but there are two important reasons that we could address:
+- when notification server is not subscribed to SMP server(s), the notifications can be dropped - it can happen because either notification server restarts or becuase SMP server restarted and some messages are received before notification server resubscribed. We lose approximately 3% of notifications because of this reason.
+- when user device is offline or has low power condition, Apple does not deliver notification, but puts them to storage. If while the notification is in storage a new one arrives it would overwrite the previous notification. If it was the message to the same message queue, the client will download messages anyway, up to a limit, but if the message was to another queue, it will not be delivered until the app is opened. Apple delivers about 88% of notifications that should be delivered (not accounting for uninstalled apps), the rest is replaced with the newer notifications.
+
+## Solution
+
+The first problem can be solved by preserving notifications for a limited time (say 1 hour) in case there is no subscription to notification from notification server. At the very least, they can be preserved in SMP server memory but can also be stored to a file on restart, similar to messages, and be delivered when notification server resubscribes. It is sufficient to store one notification per messaging queue.
+
+The second problem is both more damaging and more complex to solve. The solution could be to always deliver several last notifications to different queues in one packet (Apple allows up to ~4-5kb notification size, and we are sending packets of fixed size 512 bytes, so we could fit up to 8-10 of them in each notification).
+
+Every time a client receives such batch of notifications if can:
+- check if that notification was already received in the previous batch.
+- if it was received, it would be ignored, otherwise it would be processed.
+- process them one by one, started from the most recent one while the time allows.

rfcs/2024-09-01-smp-message-storage.md

@@ -0,0 +1,179 @@
+# SMP server message storage
+
+## Problem
+
+Currently SMP servers store all queues in server memory. As the traffic grows, so does the number of undelivered messages. What is worse, Haskell is not avoiding heap fragmentation when messages are allocated and then de-allocated - undelivered messages use ByteString and GC cannot move them around, as they use pinned memory.
+
+## Possible solutions
+
+### Solution 1: solve only GC fragmentation problem
+
+Move from ByteString to some other primitive to store messages in memory long term, e.g. ShortByteString, or manage allocation/de-allocation of stored messages manually in some other way.
+
+Pros: the simplest solution that avoids substantial re-engineering of the server.
+
+Cons:
+- not a long term solution, as memory growth still has limits.
+- may be ineffective, as it introduces additional copying of bytes.
+
+### Solution 2: move message storage to hard drive
+
+Use files or RocksDB to store messages.
+
+Pros:
+- much lower memory usage.
+- no message loss in case of abnormal server termination (important until clients have delivery redundancy).
+- this is a long term solution, and at some point it might need to be done anyway.
+
+Cons:
+- substantial re-engineering costs and risks.
+- metadata privacy. Currently we only save undelivered messages when server is restarted, with this approach all messages will be stored for some time. this argument is limited, as hosting providers of VMs can make memory snapshots too, on the other hand they are harder to analyze than files. On another hand, with this approach messages will be stored for a shorter time.
+
+#### RocksDB and other key-value stores
+
+The downside of any key-value stores is that they don't seem to have efficient primitives for sequential delivery. While sequential delivery can be modelled with linked lists, they would require 1 key insert (on send), 3 key updates (1 update to update queue data on send, 1 update of the last message to point to the next, 1 update on delivery or message expiration) and 1 key deletion (on delivery or message expiration) for each delivered message.
+
+This might result in substantial write amplification and compacting costs.
+
+In general, tree structures that are efficient for quick lookups and updates, given approximately fixed value size, are inefficient for modelling queues.
+
+#### Files
+
+The upside of files is that they are well suited for sequential delivery and don't result in the same churn, with careful design, as trees do.
+
+The downside of filesystem is that it does not scale well with the large number of files in a folder, so queues will have to be spread across multiple folders, following tree-like structure.
+
+I could not find an available library that efficiently models sequential delivery in highly concurrent environment.
+
+A possible design could be the following.
+
+##### Queue folder and files
+
+Each message queue is stored in its own folder (see below on folder locations). Folder would contain these files:
+
+- `messages.abcd.log` - the file that is used to read messages from, sequentially
+- `messages.efgh.log` - the optional file that is used to write messages, in case it is different from read file.
+- `queue.log` - append-only file where the last line represents the current queue state
+- `queue.timestamp.log` - previous states of queue.log file
+
+Each line in "queue.log" file has this syntax
+
+```abnf
+queueLogLine =
+    %s"read_file=" base64
+    %s"read_msg=" digits
+    %s"read_byte=" digits
+    %s"write_file=" base64
+    %s"write_msg=" digits
+```
+
+When queue is first requested by the server:
+
+```c
+if queue folder exists:
+    read queue state from last line of queue.log
+    if queue.log contained more than one line: // compaction
+        copy queue.log to queue.timestamp.log
+        write one line queue state to queue.log
+else:
+    create queue folder
+    create messages.abcd.log (abcd is some random string)
+    read_msg = 0
+    read_byte = 0
+    create queue.log with one line: "read_file=abcd read_msg=0 read_byte=0 write_files=abcd write_msg=0"
+open read_file in ReadMode and seek to read_byte position
+nextReadByte = read_byte
+nextReadMsg = read_msg
+open write_file in AppendMode
+```
+
+When message is added to the queue (assumes that queue state is loaded to server memory, if not the previous section will be done first):
+
+```c
+if write_msg > max_queue_messages:
+    return quota error
+else if write_msg = max_queue_messages:
+    add quota_exceeded message to write_file
+    update queue state: write_msg += 1
+    append updated queue state to queue.log
+else
+    // It is required that `max_queue_messages < max_file_messages`,
+    // so that we never need more than one additional write file.
+    if write_msg >= max_file_messages: // queue file rotation
+        create messages.efgh.log // efgh is some random string
+        update queue state: write_file=efgh write_msg=0 // read file remains the same as it was
+        append updated queue state to queue.log
+        copy queue.log to queue.timestamp.log
+        // `old` needs to be defined to limit the number and storage duration,
+        // preserving not more than N files, and not more than M days files, "and then some"
+        // (that is if the queue has high churn, we have file from M days before in any case, for any debugging).
+        delete `old` `queue.timestamp.log` files
+        write one line queue state to queue.log // compaction
+
+    add message to write_file
+    update queue state: write_msg += 1
+    append updated queue state to queue.log
+```
+
+The above algorithm assumes `max_queue_messages < than max_file_messages`, so that we never need more than one write file.
+
+When message is delivered, it is simply read from the read queue, queue state does not change yet:
+
+```c
+if nextReadMsg > read_msg:
+    deliver cached message, no need to read it again
+else
+    read message from read_file handle
+    nextReadMsg = read_msg + 1
+    nextReadByte = current position in file
+```
+
+When message delivery is acknowledged, the read queue needs to be advanced, and possibly switched to read from the current write_queue:
+
+```c
+if nextReadByte == read_byte:
+    return error // nothing was delivered
+else if nextReadByte = EOF:
+    // end of file is reached, possibly some other condition,
+    // but it should allow changing max_file_messages on server restart
+    currReadFile = read_file
+    read_file = write_file
+    read_msg = 0
+    read_byte = 0
+    append updated queue state to queue.log
+    delete currReadFile
+else
+    read_msg += 1
+    read_byte = nextReadByte
+    // `seek` should not be necessary, as the handle is already at nextReadByte position here
+    // seek to read_byte
+    append updated queue state to queue.log
+```
+
+The above algorithm delegates the problem of compaction and fragmentation management to file system, that is very optimized for such scenarios.
+
+Also, read and write files will grow to almost a constant size, so the space they used may be re-used.
+
+An important consideration is that writes to queue.log and message.log files and queue state modifications have to be sequential, without concurrency - it can be managed with the usual locks.
+
+##### Queue folders structure
+
+Most Linux systems use EXT4 filesystem where the file lookup time scales linearly to the number of files. While alternatives with logarithmic lookup time exist (XFS), they may be very complex to configure on the existing systems.
+
+So storing all queue folders in one folder won't scale.
+
+To solve this problem we could use recipient queue ID in base64url format not as a folder name, but as a folder path, splitting it to path fragments of some length. The number of fragments can be configurable and migration to a different fragment size can be supported as the number of queues on a given server grows.
+
+Currently, queue ID is 24 bytes random number, thus allowing 2^192 possible queue IDs. If we assume that a server must hold 1b queues, it means that we have ~2^162 possible addresses for each existing queue. 24 bytes in base64 is 32 characters that can be split into say 8 fragments with 4 characters each, so that queue folder path for queue with ID `abcdefghijklmnopqrstuvwxyz012345` would be:
+
+`/var/opt/simplex/messages/abcd/efgh/ijkl/mnop/qrst/uvwx/yz01/2345`
+
+The maximum theoretic number of the folders on the 1st level is 64^4, or 2^24 ~ 16m - this is probably still a large number of subfolders for EXT4. Given that addresses are random, all the possible combinations in the first folder can be used with a large number of queues.
+
+So we could use an unequal split of path, two letters each and the last being long:
+
+`/var/opt/simplex/messages/ab/cd/ef/ghijklmnopqrstuvwxyz012345`
+
+The first three levels in this case can have 4096 subfolders each, and it gives 68b possible subfolders (64^2^3), so the last level will be sparse in case of 1b queues on the server. So we could make it 4 levels with 2 letters to never think about it, accounting for a large variance of the random numbers distribution:
+
+`/var/opt/simplex/messages/ab/cd/ef/gh/ijklmnopqrstuvwxyz012345`

rfcs/2024-09-05-queue-storage.md

@@ -0,0 +1,81 @@
+# Storage considerations for SMP queues
+
+See [Short invitation links](./2024-06-21-short-links.md).
+
+## Problem
+
+1) queue records are created permanently, until the clients delete them.
+
+2) clients only delete queue records based on some user action, pending connections do not expire.
+
+While part 2 should be improved in the client, indefinite storage of queue records becomes a much bigger issue if each of them would result in a permanent storage of 4-16kb blob in server memory, without server-side expiration for short invitation links.
+
+## Possible solutions
+
+1) Add some queue timestamp, e.g. queue creation date, to expire unsecured queues after say 3 weeks.
+
+The problem with this approach is that contact addresses are also unsecured queues, and they should not be expired.
+
+We could set really large expiration time, and require that clients "update" the unsecured queues they need at least every 1-2 years, but it would not solve the problem of storing a large number of blobs in the server memory for unused/abandoned 1-time invitations.
+
+2) Do not store blobs in memory / append-only log, and instead use something like RocksDB. While it may be a correct long term solution, it may be not expedient enough at the current POC stage for this feature. Also, the lack of expiration is wrong in any case and would indefinitely grow server storage.
+
+3) Add flag allowing the server to differentiate permanent queues used as contact addresses, also using different blob sizes for them. In this case, messaging queues will be expired if not secured after 3 weeks, and contact address queues would be expired if not "updated" by the owner within 2 years.
+
+Probably all three solutions need to be used, to avoid creating a non-expiring blob storage in memory, as in case too many of such blobs are created it would not be possible to differentiate between real users and resource exhaustion attacks, and unlike with messages, they won't be expiring too.
+
+Servers already can differentiate messaging queues and contact address queues, if they want to:
+- with the old 4-message handshake, the confirmation message on a normal queue was different, and also KEY command was eventually used.
+- with the fast 2-message handshake, while the confirmation message has the same syntax, and the differences are inside encrypted envelope, the client still uses SKEY command.
+- in both cases, the usual messaging queues are secured, and contact addresses are not, so this difference is visible in the storage as well (although it is not easy to differentiate between abandoned 1-time invitations and contact addresses).
+
+Differentiating these queues can also allow different message retention times - e.g., the queues for contact addresses could have bigger size, but have lower message retention time.
+
+## Proposed solution
+
+1. Add queue updated_at date into queue records. While it adds some metadata, it seems necessary to manage retention and quality of service. It will not include exact time, only date, and the time of creation will be replaced by the time of any update - queue secured, a message is sent, or queue owner subscribes to the queue. To avoid the need to update store log on every message this information can be appended to store log on server termination. Or given that only one update per day is needed it may be ok to make these updates as they happen (temporarily making the sequence and time of these events available in storage).
+
+2. Add flag to indicate the queue usage - messaging queue or queue for contact address connection requests. This would result in different queue size and different retention policy for queue and its messages. We already have "sender can secure flag" which is, effectively, this flag - contact address queues are never secured. So this does not increase stored metadata in any way.
+
+## Possible changes to short links
+
+This is a design considerations and a concept, not a design yet.
+
+Instead of implementing a generic blob storage that can be used as an attack vector, and adds additional failure point (another server storing blob that is necessary to connect to the queue on the current server), but instead adds an extended queue information blobs, most of which could be dropped without the loss of connectivity, so that the attack can be mitigated by deleting these blobs without users losing the ability to connect, as long as the queue and minimal extended information is retained.
+
+So, to make the connection there need to be these elements:
+
+- queue server and queue ID - mandatory part, that can be included in short link
+- SMP key - mandatory part for all queues. We are considering initializing ratchets earlier for contact addresses, and include ratchet keys and pre-keys into queue data as well, but it is out of scope here.
+- Ratchet keys - mandatory part for 1-time invitation that won't fit in short link.
+- PQ key - optional part that can be stored with addresses if ratchet keys are added and with 1-time invitations.
+- App blobs - chat preferences for 1-time invitation links and profile information for contact addresses.
+
+So rather that storing one blob with a large address inside it, not associated with the queue, increasing probability of failure and reducing our ability to mitigate resource exhaustion, we could store extended blobs associated with the queues.
+
+Also, we need the address shared with the sender (party accepting the connection) to be short. We could use a similar approach that was proposed for data blobs, using a single random seed per queues to derive multiple keys and IDs from it. For example:
+
+1. The queue owner:
+  - generates Ed25529 key pair `(sk, spk)` and X25519 key pair `(dhk, dhpk)` to use with the server, same as now sent in NEW command.
+  - generates queue recipient ID (this ID can still be server-generated).
+  - generates X25519 key pair `(k, pk)` to use with the accepting party.
+  - derives from `k`:
+    - sender ID.
+    - symmetric key for authenticated encryption of blobs.
+  - `k` will be used as short link.
+2. All other data from the invitation can be included in queue creation request and be associated with the queue as 1-3 blobs with different priority:
+  - ratchet keys - it will have a small size, so only this blob cannot be removed, while other blobs can be removed in case of resource exhaustion.
+  - PQ keys - optional blob.
+  - conversation preferences and profile - can be removed depending on creation time, e.g. all new blobs can be removed.
+
+The algorithm used to derive key and ID from `k` needs to be cryptographically secure, e.g. it could be some KDF or ChaCha DRG initialized with `k` as seed, TBC.
+
+So, coupling blob storage with messaging queues has these pros/cons:
+
+Cons:
+- no additional layer of privacy - the server used for connection is visible in the link, even after the blobs are removed from the server.
+
+Pros:
+- no additional point of failure in the connection process - the same server will be used to retrieve necessary blobs as for connection.
+- queue blobs of messaging blobs will be automatically removed once the queue is secured or expired, without additional request from the recipient - reducing the storage and the time these blobs are available.
+- queue blobs for contact addresses will be structured and some of the large blobs can be removed in case of resource exhaustion attack (and recreated by the client if needed), with the only downside that PQ handshake will be postponed (which is the case now) and profile will not be available at a point of connection.

rfcs/2024-09-09-smp-blobs.md

@@ -0,0 +1,80 @@
+# Blob extensions for SMP queues
+
+Evolution of the design for short links, see [here](./2024-06-21-short-links.md) and [here](./2024-09-05-queue-storage.md).
+
+## Problems
+
+Allow storing extended information with SMP queues to improve UX and security of making connections:
+- short invitation links and contact addresses.
+- PQ encryption from the first message.
+- present user profile with chat preferences and welcome message when the public address link is scanned.
+
+## Design
+
+1. Queue creation/update date is already added to server persistence, allowing to expire queues and blobs, depending on their usage.
+2. Add "queue type" metadata to NEW command to indicate whether messaging queue is used as public address or as messaging queue (see previous docs on why it doesn't change threat model). While at the moment it would match sndSecure flag there may be future scenarios when they diverge. Initially only "invitation" and "contact" types will be supported.
+3. Prohibit sndSecure flag for "contact" queues, prohibit securing contact queues.
+4. Add "queue blobs" to NEW command:
+  - blob0: ratchetKeys up to N0 bytes - priority 0, can't be removed by the server, only in "invitation"
+  - blob1: PQ key up to N1 bytes - priority 1, can be removed by the server, only used in "invitation"
+  - blob2: Application data up to N2 bytes - priority 2, can be removed by the server.
+5. Add linkId to NEW command
+6. linkId and blobs will be removed when queue is secured.
+7. Add recipient command to remove/upsert blob2 for contact queues.
+8. Add sender command to retrieve blobs.
+
+## Protocol
+
+### Creating a queue:
+
+The queue owner:
+- generates Ed25529 key pair `(sk, spk)` and X25519 key pair `(dhk, dhpk)` to use with the server, same as now. `sk` and `dhk` will be sent in NEW command.
+- generates X25519 key pair `(k, pk)` to use with the accepting party to encrypt queue messages.
+- derives from `k` using HKDF:
+- symmetric key `bk` for authenticated encryption of blobs.
+- `linkId`, will be sent in NEW command.
+- `k` will be used as short link.
+- sends NEW command.
+
+NEW command syntax:
+
+```abnf
+create = %s"NEW " linkId queueType recipientAuthPublicKey recipientDhPublicKey
+                  basicAuth subscribe sndSecure [ "0" blob0 ] [ "1" blob1 ] [ "2" blob2 ] 
+queueType = %s"I" / %s "C" ; new parameter
+linkId = length *OCTET ; new parameter,
+                        ; can be empty in which case blobs won't be allowed
+blob0 = word16 *OCTET ; new parameter, encrypted ratchet keys,
+                      ; including nonce and auth tag
+blob1 = word16 *OCTET ; new parameter, encrypted PQ key
+blob2 = word16 *OCTET ; new parameter, encrypted application data
+```
+
+SET - command to update queue blobs (recipientId is used as entity ID):
+
+```abnf
+set = %s"SET " linkId [ "2" blob2 ] ; passing empty blob removes it
+linkId ; updated (or the same) linkId, can be empty to remove blobs
+        ; allows to change the address without removing the queue / changing blobs
+        ; (e.g., to avoid losing the messages).
+```
+
+### Sending messages to the queue
+
+GET - command to get queue blobs (linkId is used as entity ID):
+
+```abnf
+get = %s"GET"
+```
+
+Response to GET:
+
+```abnf
+blobs = %s"BLOB" senderId [ "0" blob0 ] [ "1" blob1 ] [ "2" blob2 ]
+```
+
+As blobs are retrieved using a separate linkId, once blobs are removed it will be impossible to find senderId from short link - it is a threat model improvement. Once server storage is compacted, it will be impossible to find queue related to the link even with the access to server data (unless server preserves the data).
+
+### Possible privacy improvement
+
+We could only allow unauthorized GET and authorized SET commands for long-term "contact" queues, and return BLOB in response to SKEY (or require that GET is authorized) - so that only the person who secures the queue will get access to data blobs. This way it ensures that the parties transmitting the invitation links cannot retrieve their content without the sender noticing it.

rfcs/2024-09-10-private-rendezvous.md

@@ -0,0 +1,26 @@
+# Private rendezvous protocol
+
+## Problem
+
+Our current handshake protocol is open to this attack: whoever observes the link exchange, knows on which server connection is being made, and if the traffic on this server is observed, then it can confirm communication between parties. Further, even with the [last proposal](./2024-09-09-smp-blobs.md#possible-privacy-improvement), having real-time access to the server data allows to establish the exact messaging queue that is used to send messages.
+
+## Solution
+
+We could make the initial link exchange more private by making it harder for any observer to discover which server will be used for messaging by hiding this information from the server that hosts the initial link.
+
+Preliminary, the protocol could be the following:
+
+1. Connection initiator stores 224-256 bytes of encrypted connection link on a rendezvous server (link contains server host and linkId on another messaging server, not a rendezvous one).
+
+2. Rendezvous server adds these links to buckets, up to 64 links per bucket. Bucket ID is the timestamp when the bucket was created + a sequential bucket number, in case more than one bucket is created per second.
+
+3. The server responds to the link creator with a bucket ID where this link was added. That bucket ID is its timestamp + a number prevents server "fingerprinting" clients and using say one bucket for each client. If timestamp is different or a bucket number within this timestamp is too large, the client can refuse to use it, depending on the client settings.
+
+4. The initiating party will pass to the accepting party the rendezvous server host, the hash of this bucket ID (bucket link) and the passphrase to derive the key from. The initiating party has an option to pass a link and passphrase via two channels - in which case the link will only contain the bucket ID.
+
+5. The accepting party would then request the bucket via its ID hash (the server would store hashes to be able to look up - hash is used to prevent showing time in the link) and attempt to decrypt all contained links using the provided key.
+The accepting party then will continue the connection via the decrypted link.
+
+This obviously does not protect accepting party from the initiating party, if it can choose rendezvous server it controls. It also does not protect from the malicious rendezvous server that would collaborate with link observers. I think reunion doesn’t protect from it too.
+
+But it does protect connection from whoever observes the link, particularly if this link only contains the bucket and the key is passed separately, via some other channel.

rfcs/2024-09-15-shared-port.md

@@ -0,0 +1,163 @@
+# Sharing protocol ports with HTTPS
+
+Some networks block all ports other than web ports, including port 5223 used for SMP protocol by default. Running SMP servers on a common web port 443 would allow them to work on more networks. The servers would need to provide an HTTPS page for browsers (and probes).
+
+## Problem
+
+Browsers and tools rely on system CA bundles instead of certificate pinning.
+The crypto parameters used by HTTPS are different from what the protocols use.
+Public certificate providers like LetsEncrypt can only sign specific types of keys and Ed25519 isn't one of them.
+
+This means a server should distinguish browser and protocol clients and adjust its behavior to match.
+
+## Solution
+
+`tls` package has a server hook that allows producing a different set of `TLS.Credentials` according to a client-provided "Server Name Indication" extension.
+
+Since LE certificates are only handed out to domain names, TLS client will be sending the SNI.
+However client transports are constructed over connected sockets and the SNI wouldn't be present unless explicitly requested.
+When a client sends SNI, then it's a browser and a web credentials should be used.
+Otherwise it's a protocol client to be offered the self-signed ca, cert and key.
+
+When a transport colocated with a HTTPS, its ALPN list should be extended with `h2 http/1.1`.
+The browsers will send it, and it should be checked before running transport client.
+If HTTP ALPN is detected, then the client connection is served with HTTP `Application` instead (the same "server information" page).
+
+If some client connects to server IP, doesn't send SNI and doesn't send ALPN, it will look like a pre-handshake client.
+In that case a server will send its handshake first.
+This can be mitigated by delaying its handshake and letting the probe to issue its HTTP request.
+
+## Implementation plan
+
+An unmodified client should be able to use protocols on port 443 right away.
+
+The switchover happens inside `runTransportServerState` before `runClient`:
+
+```haskell
+runServer (tcpPort, ATransport t) = do
+  -- ...
+  runTransportServerState_ ss started tcpPort serverParams tCfg $ \socket h -> do -- expose raw socket for warp-tls internals to attach
+    negotiated <- getSessionALPN
+    if allowHTTP t && isHTTP negotiated -- only attempt the switch for the TLS transport
+      then runHTTP socket (tlsContext h)-- ... collect data and produce values needed to run WAI Application
+      else runClient serverSignKey t h `runReaderT` env -- performs serverHandshake etc as usual
+```
+
+The web app and server live outside, so `runHttp` has to be provided by the `runSMPServer` caller.
+Additonally, Warp is using its `InternalInfo` object that's scoped to `withII` bracket.
+
+```haskell
+  runServer ini = do
+    -- ...
+
+    runWebServer ini ServerInformation {config, information} $ if sharedHttps then Nothing else webHttpsParams -- suppress serving https
+    if sharedHttps
+      then withRunHTTP staticFilesPath \attachStatic -> runSMPServer cfg (Just attachStatic) -- provide wrapped application runner
+      else runSMPServer cfg Nothing
+```
+
+### Upstream
+
+The implementation relies on a few modification to upstream code:
+- `warp-tls`: The library provides `httpOverTls`, but it wants to do handshake itself.
+  Since we have to do the handshake to switch on ALPN, the setup function has to be split.
+  This is a resonable change that may be upstreamed and nothing blocks us from using the recent version.
+- `warp`: Only the re-export of `serveConnection` is needed.
+  Unfortunately the most recent `warp` version can't be used right away due to dependency cascade around `http-5` and `auto-update-2`.
+  So a fork containing the backported re-export has to be used until the dependencies are refreshed.
+
+
+### TLS.ServerParams
+
+When a server has port sharing enabled, a new set of TLS params is loaded and combined with transport params:
+
+```haskell
+newEnv config = do
+  -- ...
+  tlsServerParams <- loadTLSServerParams caCertificateFile certificateFile privateKeyFile (alpn transportConfig)
+  sharedServerParams <- forM ((,) <$> sharedHttpsCredentials config <*> alpn transportConfig) $ \((chain, key), alpn) ->
+    let ca = Nothing -- It is possible to provide CA certificate, but it is typical for web server to use combined certificate chains
+    loadHTTPSServerParams tlsServerParams ca chain key alpn
+```
+
+`loadHTTPSServerParams` extends params with:
+1. `onALPNClientSuggest` hook gets `["h2", "http/1.1"]` added to the ALPN list which is now required.
+2. `onServerNameIndication` hook added, which upon detecting client SNI prepends the web credentials.
+3. `sharedCredentials = T.Credentials []` should be done to prevent transport credentials confusing browsers.
+    But that aborts key exchange somewhere in tls internals, so disabled for now.
+    As a workaround, another set of dummy credentials can be provided in the hope that any sane browser would reject them.
+    Like, RC4 ciphers, "impossible" digest combination, etc.
+
+### supportedParameters
+
+TLS certificate chains provided by LetsEncrypt use ECDSA/P256 and that requires extending `supportedParameters` with things disabled in transports:
+
+```haskell
+    browserCiphers =
+      [ TE.cipher_TLS13_AES128CCM8_SHA256
+      , TE.cipher_ECDHE_ECDSA_AES128CCM8_SHA256
+      , TE.cipher_ECDHE_ECDSA_AES256CCM8_SHA256
+      ]
+    browserGroups =
+      [ T.P256
+      ]
+    browserSigs =
+      [ (T.HashSHA256, T.SignatureECDSA),
+        (T.HashSHA384, T.SignatureECDSA)
+      ]
+```
+
+This may not be enough for other certificate providers.
+
+## Configuration
+
+> XXX: This is for the current implementation and should be updated.
+
+Web certificate chain is picked up from the WEB section:
+
+```ini
+[TRANSPORT]
+port: 443
+
+[WEB]
+https: 443
+cert: /etc/opt/simplex/web.cert
+key: /etc/opt/simplex/web.key
+
+# Alternatively, with a proper access configuration, the paths can point to the LE creds directly:
+# cert: /etc/letsencrypt/live/smp.hostname.tld/fullchain.pem
+# key: /etc/letsencrypt/live/smp.hostname.tld/privkey.pem
+```
+
+When `TRANSPORT.port` matches `WEB.https` the transport server becomes shared.
+
+Perhaps a more desirable option would be explicit configuration resulting in additional transported to run:
+
+```ini
+[TRANSPORT]
+port: 5223 ; pure protocol transport
+# control_port: 5224
+shared_port: 443 ; variant 1: register in TRANSPORT
+
+[WEB]
+https: 443
+cert: /etc/opt/simplex/web.cert
+key: /etc/opt/simplex/web.key
+# transport: on ; variant 2:
+```
+
+## Caveats
+
+Serving static files and the protocols togother may pose a problem for those who currently use dedicated web servers as they should switch to embedded http handlers.
+
+As before, using embedded HTTP server is increasing attack surface.
+
+Users who want to run everything on a single host will have to add and extra IP address and bind servers to specific IPs instead of 0.0.0.0.
+An amalgamated server binary can be provided that would contain both SMP and XFTP servers, where transport will dispatch connections by handshake ALPN.
+
+## Alternative: Use transports routable with reverse-proxies
+
+An "industrial" reverse proxy may do the ALPN routing, serving HTTP by itself and delegating `smp` and `xftp` to protocol servers.
+Same with the `websockets`.
+
+Since this in effect does TLS termination, the protocol servers will have to rely on credentials from protocol handshakes.

rfcs/2024-09-25-ios-notifications-2.md

@@ -0,0 +1,49 @@
+# iOS notifications delivery
+
+## Problem
+
+For iOS notifications to be delivered the client has to create credentials for notification subscription on SMP server using NKEY command and after that create a subscription on notification server using SNEW command. These two commands are sent in sequence, after the connections are created, and for it to happen the client needs to be online and in foreground.
+
+iOS users tend to close the app when it is not used, and iOS has very limited permissions for background activities, so these notification subscriptions are created with a substantial delay, and notifications do not work.
+
+This problem is distinct from and probably more common than other problems affecting notifications delivery described [here](./2024-07-06-ios-notifications.md).
+
+## Solution
+
+1. When the new connection is created, the client already knows if it needs to create notification subscription or not, based on the conversation setting (e.g., if the group is muted, the client will not create notification subscription as well.). We should extend NEW command to avoid the need to send additional NKEY command with an option to create notification subscription at the point where connection is created. NDEL would still be used to disable this notification, and NKEY will be used to re-enable it.
+
+2. In the same way we stopped using SDEL command (NDEL sends notification DELD to subscribed notification server) to delete notificaiton subscriptions from notification server, we should delegate creating notification subscription on notification server to SMP servers. Clients could use keys agreed with ntf server for e2e encryption and for command authorization to encrypt and sign instruction to create notification subscription that will be forwarded to notification server using protocol similar to SMP proxies. This will avoid the need for clients to separately contact notification servers that won't happen until they are online.
+
+3. Instead of making Ntf server trust DELD notifications, we could send deletion instructions signed by the client, which will only fail to send in case notification server is down (and they won't be sent later after server restart).
+
+Cons:
+- If SMP servers were to retain in the storage the information about which notification server is used for which queue, it would reduce metadata privacy. While currently it is not an issue, as all notification servers are known and operated by us, once there are other client apps, this can be used for app users fingerprinting, which would act as a deterrence from using new apps – but only if app users use servers of operators who are different from the app provider. To mitigate it, we could only store it in server memory and include notification instruction in subscription commands (SUB) and include notification subscription status in SUB responses. We don't need to mitigate the problem of server being able to store this information, as messaging servers can observe which notification servers connect to them anyway.
+- If SMP server is restarted before the subscription request is forwared to the notification server, then it will have to be forwarded again, once the client subscribes. The problem here is that if the client is offline, it will neither subscribe to the queue to send notification subscription request, nor receive notifications from this queue. Storing notification server and subscription request would mitigate that, as in this case we could send all pending requests on server start, without depending on client subscriptions.
+- "Small" agent will need to support connections to ntf servers and manage workers that retry sending pending subscription requests.
+- Until the client learns the public keys of notification server, it will not be able to decrypt notifications. It potentially can be mitigated by using the public key of the server returned when token is created, in this way different client keys (per-queue) will be combined with the same ntf server key (per-token).
+
+## Implementation details
+
+1. NEW and NKEY commands will need to be extended to include notification subscription request. As the notifier ID needs to be sent to notification server, this notifier ID will have to be client-generated and supplied as part of NEW command.
+
+now:
+
+```haskell
+NEW :: RcvPublicAuthKey -> RcvPublicDhKey -> Maybe BasicAuth -> SubscriptionMode -> SenderCanSecure -> Command Recipient
+NKEY :: NtfPublicAuthKey -> RcvNtfPublicDhKey -> Command Recipient
+```
+
+extended:
+
+```haskell
+NEW :: RcvPublicAuthKey -> RcvPublicDhKey -> Maybe BasicAuth -> SubscriptionMode -> SenderCanSecure -> Maybe NtfRequest -> Command Recipient
+
+data NtfRequest = NtfRequest NotifierId NtfPublicAuthKey RcvNtfPublicDhKey NtfServerRequest
+
+data NtfServerRequest = NtfServerRequest NtfServer EncSingedNtfCmd
+
+NKEY :: NtfPublicAuthKey -> RcvNtfPublicDhKey -> Maybe NtfServerRequest -> Command Recipient
+-- NotifierID is passed in entity ID field of the transmission
+```
+
+2. Notification server will need to support an additional command to receive "proxied" subscription commands, `SFWD`, that would include `NtfServerRequest`. This command can include both `SNEW` and `SDEL` commands.

rfcs/2024-11-25-journal-expiration.md

@@ -0,0 +1,15 @@
+# Expiring messages in journal storage
+
+## Problem
+
+The journal storage servers recently migrated to do not delete delivered or expired messages, they only update pointers to journal file lines. The messages are actually deleted when the whole journal file is deleted (when fully deleted or fully expired).
+
+The problem is that in case the queue stops receiving the new messages then writing of messages won't switch to the new journal file, and the current journal file containing delivered or expired messages would never be deleted.
+
+## Solution
+
+Remove current journal file and update queue_state.log during message expiration of "idle" queue (that is, without any new messages received or delivered within 3 hours) in case when:
+- the queue is "empty" after the expiration
+- the queue contains only quota marker(s), in which case move them to a new journal file and update the queue_state accordingly. Quota markers can be kept indefinitely to prevent writing the new messages to the dormant queues that reached capacity, so it's important to handle this case.
+
+Also remove current journal file when the queue is opened in case it is empty (as it would not be ever expired in case it remains empty), and also update queue_state.log

rfcs/2024-11-25-queue-blobs-2.md

@@ -0,0 +1,58 @@
+# Blob extensions for SMP queues 2 and queue storage
+
+This document evolves the design proposed [here](./2024-09-09-smp-blobs.md).
+
+## Problems
+
+In addition to problems in the first doc, we have these issues with in-memory queue record storage:
+- many queues are idle or rarely used, but they are loaded to memory, and currently just loading all queues uses 20gb RAM on each server, and takes 10 min to process, increasing downtimes during restarts.
+- adding blobs to memory would make this problem much worse.
+
+## Proposed solution
+
+Move queues to the same journalling approach as [used for messages](./2024-09-01-smp-message-storage.md) now, with independent file names in the same folders.
+
+Each queue change would be logged to its own file, and every time the queue is opened the whole file will be read and compacted to a single line - replacing one store log for all queues, with individual log files for each queue.
+
+Queue deletion would not be making a record in the file, instead it would be deleting the entire folder - it would reduce retention period for any metadata of deleted queues.
+
+We could additionally record deletions to the central log, for debugging, and reset it on every start. But in this case we should not remove folders at the point of deletion, but rather mark them as deleted and delete on restart. TBC
+
+It would also allow simplifying blob storage by having only one blob per queue - for example, limied to 16kb (a bit smaller to fit in block) for contact address queues and 4-8kb for invitations (to fit PQ keys and conversation preferences).
+
+We would also need to be able to lookup recipient ID via sender/notifier/link IDs.
+
+One possible solution is to use and load to memory a central index file. But it is likely to also consume a lot of memory and result in slow starts.
+
+Another solution that is probably better is to use the same folder structure and put notifier/sender/link files with the ID of the recipient queue inside the files. So to locate recipient queue the sender would have to locate folder containing the reference file pointing to the recipient queue and then to locate the actual queue data.
+
+## Implementation details
+
+Each queue folder would these files:
+
+- queue_state.log (and timestamped backups) - to store pointers to message journals (already implemented)
+- messages.randomBase64.log - message journals (already implemented)
+- queue_rec.log (and timestamped backups) - to log complete queue record every time it is changed (so only the last line needs to be read following the same logic as with queue_state.log, to prevent file corruption).
+- blob.data, blob.data.bak, blob.timestamp.data - files for data blobs (to make sure some copy of this file is readable/correct in case of write corruption) - the same two step overwrite process will be used as currently with store log compacting:
+  - on write: 1. if file exists, move it to .bak, 2. store new blob to .data, 3. move .bak to .timestamp.data
+  - on read: 1. if .bak exists, move it to .data 2. use .data
+
+Additional suggestion to reduce probability of queue_state.log and queue_rec.log file corruption is to do one of the following:
+- log end of lines in the beginning of the output, not in the end, to prevent the last line from being corrupted in case the previous line was not fully stored. The downside is that the file will not be EOL terminated, and there will be no confirmation that the output was fully made.
+- log EOL both in the beginning and at the end of output, and ignore empty lines in between - this would both confirm that the last line is fully logged and prevent corruption of the next line in case it was not.
+- check the last byte of the file and log EOL if it is not EOL. Probably cleanest approach, but with a small performance cost.
+
+If queue folder is a reference to the queue, it may have one of these files:
+- notifier.id
+- sender.id
+- link.id
+
+These files would contain a one line with the recipient ID of the queue. These files would never change, they can only be deleted when queue is deleted or when notifier/link is deleted.
+
+There is logic in code preventing using the same ID in different contexts, and the ID size is large enough to make any collisions unlikely (192 bits), so with correctly working code the queue folder would either have one of reference files, and nothing else, or the queue and message files from the beginning of this section. But even if the same ID is re-used in different context, it should not cause any problems as file names don't overlap.
+
+While we could store different types of references in different types of folders, it would have additional costs of maintaining 4 folder hierarchies. Instead we could use the fact that it is one hierarchy to prevent using the same ID in different contexts.
+
+## Protocol
+
+The only change in protocol is that there will be only one blob per queue, without markers (see the previous doc). Otherwise the protocol and proposed privacy improvement seem reasonable.

rfcs/done/2023-10-25-remote-control.md

@@ -53,7 +53,7 @@ The session invitation contains this data:
 - CA TLS certificate fingerprint of the controller - this is part of long term identity of the controller established during the first session, and repeated in the subsequent session announcements.
 - Session Ed25519 public key used to verify the announcement and commands - this mitigates the compromise of the long term signature key, as the controller will have to sign each command with this key first.
 - Long-term Ed25519 public key used to verify the announcement and commands - this is part of the long term controller identity.
-- Session X25519 DH key and sntrup761 KEM encapsulation key to agree session encryption (both for multicast announcement and for commands and responses in TLS), as described in https://datatracker.ietf.org/doc/draft-josefsson-ntruprime-hybrid/. The new keys are used for each session, and if client key is already available (from the previous session), the computed shared secret will be used to encrypt the announcement multicast packet. The out-of-band invitation is unencrypted. These DH public key and KEM encapsulation key are always sent unencrypted. NaCL Cryptobox is used for encryption.
+- Session X25519 DH key and sntrup761 KEM encapsulation key to agree session encryption (both for multicast announcement and for commands and responses in TLS), as described in https://datatracker.ietf.org/doc/draft-josefsson-ntruprime-hybrid/. The new keys are used for each session, and if client key is already available (from the previous session), the computed shared secret will be used to encrypt the announcement multicast packet. The out-of-band invitation is unencrypted. This DH public key is always sent unencrypted. NaCL Cryptobox is used for encryption.
 
 Host device decrypts (except the first session) and validates the invitation:
 - Session signature is valid.

scripts/docker/docker-compose-smp-complete.yml

@@ -0,0 +1,67 @@
+name: SimpleX Chat - smp-server
+
+services:
+  oneshot:
+    image: ubuntu:latest
+    environment:
+      CADDYCONF: |
+        ${CADDY_OPTS:-}
+
+        http://{$$ADDR} {
+            redir https://{$$ADDR}{uri} permanent
+        }
+
+        {$$ADDR}:8443 {
+            tls {
+                key_type rsa4096
+            }
+        }
+    command: sh -c 'if [ ! -f /etc/caddy/Caddyfile ]; then printf "$${CADDYCONF}" > /etc/caddy/Caddyfile; fi'
+    volumes:
+      - ./caddy_conf:/etc/caddy
+
+  caddy:
+    image: caddy:latest
+    depends_on:
+      oneshot:
+        condition: service_completed_successfully
+    cap_add:
+      - NET_ADMIN
+    environment:
+      ADDR: ${ADDR?"Please specify the domain."}
+    volumes:
+      - ./caddy_conf:/etc/caddy
+      - caddy_data:/data
+      - caddy_config:/config
+    ports:
+      - 80:80
+    restart: unless-stopped
+    healthcheck:
+      test: "test -d /data/caddy/certificates/${CERT_PATH:-acme-v02.api.letsencrypt.org-directory}/${ADDR} || exit 1"
+      interval: 1s
+      retries: 60
+
+  smp-server:
+    image: ${SIMPLEX_IMAGE:-simplexchat/smp-server:latest}
+    depends_on:
+      caddy:
+        condition: service_healthy
+    environment:
+      ADDR: ${ADDR?"Please specify the domain."}
+      PASS: ${PASS:-}
+    volumes:
+      - ./smp_configs:/etc/opt/simplex
+      - ./smp_state:/var/opt/simplex
+      - type: volume
+        source: caddy_data
+        target: /certificates
+        volume:
+          subpath: "caddy/certificates/${CERT_PATH:-acme-v02.api.letsencrypt.org-directory}/${ADDR}"
+    ports:
+      - 443:443
+      - 5223:5223
+    restart: unless-stopped
+
+volumes:
+  caddy_data:
+  caddy_config:

scripts/docker/docker-compose-smp-manual.yml

@@ -0,0 +1,15 @@
+name: SimpleX Chat - smp-server
+
+services:
+  smp-server:
+    image: ${SIMPLEX_IMAGE:-simplexchat/smp-server:latest}
+    environment:
+      WEB_MANUAL: ${WEB_MANUAL:-1}
+      ADDR: ${ADDR?"Please specify the domain."}
+      PASS: ${PASS:-}
+    volumes:
+      - ./smp_configs:/etc/opt/simplex
+      - ./smp_state:/var/opt/simplex
+    ports:
+      - 5223:5223
+    restart: unless-stopped

scripts/docker/docker-compose-smp.env

@@ -0,0 +1,11 @@
+# Mandatory
+ADDR=your_ip_or_addr
+
+# Optional
+#PASS='123123'
+#WEB_MANUAL=1
+
+# Debug
+#SIMPLEX_SMP_IMAGE=smp-server-dev
+#CERT_PATH=acme-staging-v02.api.letsencrypt.org-directory
+#CADDY_OPTS='{\n    acme_ca https://acme-staging-v02.api.letsencrypt.org/directory\n}'

scripts/docker/docker-compose-xftp.env

@@ -0,0 +1,9 @@
+# Mandatory
+ADDR=your_ip_or_addr
+QUOTA=120gb
+
+# Optional
+#PASS='123123'
+
+# Debug
+#SIMPLEX_XFTP_IMAGE=xftp-server-dev

scripts/docker/docker-compose-xftp.yml

@@ -0,0 +1,16 @@
+name: SimpleX Chat - xftp-server
+
+services:
+  xftp-server:
+    image: ${SIMPLEX_XFTP_IMAGE:-simplexchat/xftp-server:latest}
+    environment:
+      ADDR: ${ADDR?"Please specify the domain."}
+      QUOTA: ${QUOTA?"Please specify disk quota."}
+      PASS: ${PASS:-}
+    volumes:
+      - ./xftp_configs:/etc/opt/simplex-xftp
+      - ./xftp_state:/var/opt/simplex-xftp
+      - ./xftp_files:/srv/xftp
+    ports:
+      - 443:443
+    restart: unless-stopped

scripts/docker/entrypoint-smp-server

@@ -1,48 +1,87 @@
 #!/usr/bin/env sh
+set -e
+
 confd='/etc/opt/simplex'
-logd='/var/opt/simplex/'
+cert_path='/certificates'
 
 # Check if server has been initialized
 if [ ! -f "${confd}/smp-server.ini" ]; then
   # If not, determine ip or domain
   case "${ADDR}" in
-    '') printf 'Please specify $ADDR environment variable.\n'; exit 1 ;;
+    '')
+      printf 'Please specify $ADDR environment variable.\n'
+      exit 1
+      ;;
+
+    # Determine domain or IPv6
     *[a-zA-Z]*)
       case "${ADDR}" in
-        *:*) set -- --ip "${ADDR}" ;;
-        *) set -- -n "${ADDR}" ;;
+        # IPv6
+        *:*)
+          set -- --ip "${ADDR}"
+          ;;
+
+        # Domain
+        *)
+          case "${ADDR}" in
+            # It's in domain format
+            *.*)
+              # Determine the base domain
+              ADDR_BASE="$(printf '%s' "$ADDR" | awk -F. '{print $(NF-1)"."$NF}')"
+              set -- --fqdn "${ADDR}" --own-domains="${ADDR_BASE}"
+              ;;
+
+            # Incorrect domain
+            *)
+              printf 'Incorrect $ADDR environment variable. Please specify the correct one in format: smp1.example.org / example.org \n'
+              exit 1
+              ;;
+          esac
       esac
       ;;
-    *) set -- --ip "${ADDR}" ;;
+
+    # Assume everything else is IPv4
+    *)
+      set -- --ip "${ADDR}" ;;
   esac
 
   # Optionally, set password
   case "${PASS}" in
-    '') set -- "$@" --no-password ;;
-    *) set -- "$@" --password "${PASS}" ;;
+    # Empty value = no password
+    '')
+      set -- "$@" --no-password
+      ;;
+
+    # Assume that everything else is a password
+    *)
+      set -- "$@" --password "${PASS}"
+      ;;
   esac
 
   # And init certificates and configs
-  smp-server init -y -l "$@"
+  smp-server init --yes \
+                  --store-log \
+                  --daily-stats \
+                  --source-code \
+                  "$@" > /dev/null 2>&1
+
+  # Fix path to certificates
+  if [ -n "${WEB_MANUAL}" ]; then
+    sed -i -e 's|^[^#]*https: |#&|' \
+           -e 's|^[^#]*cert: |#&|' \
+           -e 's|^[^#]*key: |#&|' \
+           -e 's|^port:.*|port: 5223|' \
+           "${confd}/smp-server.ini"
+  else
+    sed -i -e "s|cert: /etc/opt/simplex/web.crt|cert: $cert_path/$ADDR.crt|" \
+           -e "s|key: /etc/opt/simplex/web.key|key: $cert_path/$ADDR.key|" \
+           "${confd}/smp-server.ini"
+  fi
 fi
 
 # Backup store log just in case
-#
-# Uses the UTC (universal) time zone and this
-# format: YYYY-mm-dd'T'HH:MM:SS
-# year, month, day, letter T, hour, minute, second
-#
-# This is the ISO 8601 format without the time zone at the end.
-#
-_file="${logd}/smp-server-store.log"
-if [ -f "${_file}" ]; then
-  _backup_extension="$(date -u '+%Y-%m-%dT%H:%M:%S')"
-  cp -v -p "${_file}" "${_file}.${_backup_extension:-date-failed}"
-  unset -v _backup_extension
-fi
-unset -v _file
+DOCKER=true /usr/local/bin/simplex-servers-stopscript smp-server
 
 # Finally, run smp-sever. Notice that "exec" here is important:
 # smp-server replaces our helper script, so that it can catch INT signal
 exec smp-server start +RTS -N -RTS
-

scripts/docker/entrypoint-xftp-server

@@ -1,50 +1,90 @@
 #!/usr/bin/env sh
+set -eu
+
 confd='/etc/opt/simplex-xftp'
-logd='/var/opt/simplex-xftp'
 
 # Check if server has been initialized
 if [ ! -f "${confd}/file-server.ini" ]; then
   # If not, determine ip or domain
   case "${ADDR}" in
-    '') printf 'Please specify $ADDR environment variable.\n'; exit 1 ;;
+    '')
+      printf 'Please specify $ADDR environment variable.\n'
+      exit 1
+      ;;
+
+    # Determine domain or IPv6
     *[a-zA-Z]*)
       case "${ADDR}" in
-        *:*) set -- --ip "${ADDR}" ;;
-        *) set -- -n "${ADDR}" ;;
+        # IPv6
+        *:*)
+          set -- --ip "${ADDR}"
+          ;;
+
+        # Domain
+        *)
+          case "${ADDR}" in
+            # Check if format is correct
+            *.*)
+              set -- --fqdn "${ADDR}"
+              ;;
+
+            # Incorrect domain
+            *)
+              printf 'Incorrect $ADDR environment variable. Please specify the correct one in format: smp1.example.org / example.org \n'
+              exit 1
+              ;;
+          esac
+          ;;
       esac
       ;;
-    *) set -- --ip "${ADDR}" ;;
+
+    # Assume everything else is IPv4
+    *)
+      set -- --ip "${ADDR}"
+      ;;
   esac
 
-  # Set quota
+  # Set global disk quota
   case "${QUOTA}" in
-    '') printf 'Please specify $QUOTA environment variable.\n'; exit 1 ;;
-    *GB) QUOTA="$(printf ${QUOTA} | tr '[:upper:]' '[:lower:]')"; set -- "$@" --quota "${QUOTA}" ;;
-    *gb) set -- "$@" --quota "${QUOTA}" ;;
-    *) printf 'Wrong format. Format should be: 1gb, 10gb, 100gb.\n'; exit 1 ;;
+    '')
+      printf 'Please specify $QUOTA environment variable.\n'
+      exit 1
+      ;;
+
+    # Incorrect format in uppercase, but automagically workaround this, replacing characters to lowercase
+    *GB)
+      QUOTA="$(printf '%s' "${QUOTA}" | tr '[:upper:]' '[:lower:]')"
+      set -- "$@" --quota "${QUOTA}"
+      ;;
+
+    # Correct format  
+    *gb)
+      set -- "$@" --quota "${QUOTA}"
+      ;;
+
+    # Incorrect format
+    *)
+      printf 'Wrong format. Format should be: 1gb, 10gb, 100gb.\n'
+      exit 1
+      ;;
   esac
 
   # Init the certificates and configs
-  xftp-server init -l -p /srv/xftp "$@"
+  xftp-server init --store-log \
+                   --path /srv/xftp \
+                   "$@" > /dev/null 2>&1
+
+  # Optionally, set password
+  if [ -n "${PASS}" ]; then
+    sed -i -e "/^# create_password:/a create_password: $PASS" \
+           "${confd}/file-server.ini"
+  fi
 fi
 
 # Backup store log just in case
-#
-# Uses the UTC (universal) time zone and this
-# format: YYYY-mm-dd'T'HH:MM:SS
-# year, month, day, letter T, hour, minute, second
-#
-# This is the ISO 8601 format without the time zone at the end.
-#
-_file="${logd}/file-server-store.log"
-if [ -f "${_file}" ]; then
-  _backup_extension="$(date -u '+%Y-%m-%dT%H:%M:%S')"
-  cp -v -p "${_file}" "${_file}.${_backup_extension:-date-failed}"
-  unset -v _backup_extension
-fi
-unset -v _file
+
+DOCKER=true /usr/local/bin/simplex-servers-stopscript xftp-server
 
 # Finally, run xftp-sever. Notice that "exec" here is important:
 # smp-server replaces our helper script, so that it can catch INT signal
 exec xftp-server start +RTS -N -RTS
-

scripts/main/simplex-servers-stopscript

@@ -1,30 +1,176 @@
 #!/usr/bin/env sh
 set -eu
 
-path_conf_var="/var/opt"
-path_conf_smp="$path_conf_var/simplex"
-path_conf_xftp="$path_conf_var/simplex-xftp"
-path_conf_storelog_smp="$path_conf_smp/smp-server-store.log"
-path_conf_storelog_xftp="$path_conf_xftp/file-server-store.log"
+# Common
+# ------
 date="$(date -u '+%Y-%m-%dT%H:%M:%S')"
 
-backup_smp() {
- if [ -e "$path_conf_storelog_smp" ]; then
-  cp "$path_conf_storelog_smp" "${path_conf_storelog_smp}.${date:-date-failed}"
- fi
+GRN='\033[0;32m'
+YLW='\033[1;33m'
+BLU='\033[1;34m'
+RED='\033[0;31m'
+NC='\033[0m'
+
+path_conf_var="/var/opt"
+
+smp_variables() {
+	path_conf_smp="$path_conf_var/simplex"
+	path_conf_smp_archive="$path_conf_smp/backups"
+	path_conf_smp_archive_storelog="$path_conf_smp_archive/queues"
+	path_conf_smp_archive_stats="$path_conf_smp_archive/stats"
+	path_conf_smp_archive_messages="$path_conf_smp_archive/messages"
+	path_conf_storelog_smp="$path_conf_smp/smp-server-store.log"
+	path_conf_storelog_smp_out="$path_conf_smp_archive_storelog/smp-server-store.log.${date:-date-failed}"
+
+	path_conf_stats_smp="$path_conf_smp/smp-server-stats.log"
+	path_conf_stats_smp_out="$path_conf_smp_archive_stats/smp-server-stats.log.${date:-date-failed}"
+
+	path_conf_messages_smp="$path_conf_smp/smp-server-messages.log"
+	path_conf_messages_smp_out="$path_conf_smp_archive_messages/smp-server-messages.log.${date:-date-failed}"
 }
 
-backup_xftp() {
- if [ -e "$path_conf_storelog_xftp" ]; then
-  cp "$path_conf_storelog_xftp" "${path_conf_storelog_xftp}.${date:-date-failed}"
- fi
+xftp_variables() {
+	path_conf_xftp="$path_conf_var/simplex-xftp"
+	path_conf_xftp_archive="$path_conf_xftp/backups"
+
+	path_conf_xftp_archive_storelog="$path_conf_xftp_archive/queues"
+	path_conf_xftp_archive_stats="$path_conf_xftp_archive/stats"
+
+	path_conf_storelog_xftp="$path_conf_xftp/file-server-store.log"
+	path_conf_storelog_xftp_out="$path_conf_xftp_archive_storelog/file-server-store.log.${date:-date-failed}"
+
+	path_conf_stats_xftp="$path_conf_xftp/file-server-stats.log"
+	path_conf_stats_xftp_out="$path_conf_xftp_archive_stats/file-server-stats.log.${date:-date-failed}"
 }
 
-if [ "$1" = 'smp-server' ]; then
- backup_smp
-elif [ "$1" = 'xftp-server' ]; then
- backup_xftp
-else
- backup_smp
- backup_xftp
-fi
+checks() {
+	result=${SERVICE_RESULT:-exit-code}
+	status=${EXIT_STATUS:-TERM}
+
+	case "$result" in
+		success)
+			case "$status" in
+				TERM)
+					printf "${RED}Refusing to backup files with failed service state${NC}\n"
+					exit 1
+					;;
+				*)
+					:
+					;;
+			esac
+			;;
+		*)
+			printf "${RED}Refusing to backup files with failed service state${NC}\n"
+			exit 1
+			;;
+	esac
+}
+
+smp_check() {
+	if [ ! -d "$path_conf_smp_archive_storelog" ]; then
+		mkdir -p "$path_conf_smp_archive_storelog"
+	fi
+	if [ ! -d "$path_conf_smp_archive_messages" ]; then
+		mkdir -p "$path_conf_smp_archive_messages"
+	fi
+	if [ ! -d "$path_conf_smp_archive_stats" ]; then
+		mkdir -p "$path_conf_smp_archive_stats"
+	fi
+}
+
+xftp_check() {
+	if [ ! -d "$path_conf_xftp_archive_storelog" ]; then
+		mkdir -p "$path_conf_xftp_archive_storelog"
+	fi
+	if [ ! -d "$path_conf_xftp_archive_stats" ]; then
+		mkdir -p "$path_conf_xftp_archive_stats"
+	fi
+}
+
+backup() {
+	file="$1"
+	out="$2"
+	file_type="$3"
+
+	if [ -e "$file" ]; then
+		if cp "$file" "$out"; then
+			printf "${YLW}${file_type}${NC} ${GRN}backup successful:${NC} ${BLU}%s${NC}\n" "${out}"
+		else
+			printf "${YLW}${file_type}${NC} ${RED}backup failed!${NC}\n"
+		fi
+	fi
+
+	unset file out file_type
+}
+
+cleanup() {
+	directory="$1"
+	
+	file_type="$2"
+	
+	files_date=$(find "$directory" -type f -exec stat --format="%y" {} + | awk '{print $1}' | sort -nr | uniq | awk 'NR==2')
+	
+	if [ -n "$files_date" ]; then
+		files=$(find "$directory" -type f -not -newermt "$files_date" -printf "%T@ %Tc %p\n" | sort -n | awk '{print $NF}')
+
+		if [ -n "$files" ]; then
+			printf '%s' "$files" | xargs rm -f
+			printf "${YLW}Old ${file_type} files${NC}${GRN} has been deleted:${NC}\n"
+			files_colored=$(printf '%s' "$files" | awk '{print "\033[1;34m"$0"\033[0m"}')
+			printf "${files_colored}\n"
+		fi
+	fi
+
+	unset directory file_type files_date files
+}
+
+smp_backup() {
+	backup "$path_conf_storelog_smp" "$path_conf_storelog_smp_out" 'Storelog'
+	backup "$path_conf_messages_smp" "$path_conf_messages_smp_out" 'Messages'
+	backup "$path_conf_stats_smp" "$path_conf_stats_smp_out" 'Stats'
+}
+
+smp_cleanup() {
+	cleanup "$path_conf_smp_archive_storelog" 'storelog'
+	cleanup "$path_conf_smp_archive_stats" 'stats'
+	cleanup "$path_conf_smp_archive_messages" 'messages'
+}
+
+xftp_backup() {
+	backup "$path_conf_storelog_xftp" "$path_conf_storelog_xftp_out" 'Storelog'
+	backup "$path_conf_stats_xftp" "$path_conf_stats_xftp_out" 'Stats'
+}
+
+xftp_cleanup() {
+	cleanup "$path_conf_xftp_archive_storelog" 'storelog'
+	cleanup "$path_conf_xftp_archive_stats" 'stats'
+}
+
+main() {
+	type="${1:-}"
+
+  if [ -z "${DOCKER+x}" ]; then
+  	checks
+  fi
+
+	case "$type" in
+		smp-server)
+			smp_variables
+			smp_check
+			smp_backup
+			smp_cleanup
+			;;
+		xftp-server)
+			xftp_variables
+			xftp_check
+			xftp_backup
+			xftp_cleanup
+			;;
+		*)
+			printf "${YLW}Unknown server type.${NC}\n"
+			exit 1
+			;;
+	esac 
+}
+
+main "$@"

scripts/main/simplex-servers-update

@@ -2,8 +2,6 @@
 set -eu
 
 # Links to scripts/configs
-bin="https://github.com/simplex-chat/simplexmq/releases/latest/download"
-
 scripts="https://raw.githubusercontent.com/simplex-chat/simplexmq/stable/scripts/main"
 scripts_systemd_smp="$scripts/smp-server.service"
 scripts_systemd_xftp="$scripts/xftp-server.service"
@@ -76,6 +74,21 @@ installed_test() {
   set -u
 }
 
+set_version() {
+  ver="${VER:-latest}"
+
+  case "$ver" in 
+    latest)
+      bin="https://github.com/simplex-chat/simplexmq/releases/latest/download"
+      remote_version="$(curl --proto '=https' --tlsv1.2 -sSf -L https://api.github.com/repos/simplex-chat/simplexmq/releases/latest | grep -i "tag_name" | awk -F \" '{print $4}')"
+      ;;
+    *)
+      bin="https://github.com/simplex-chat/simplexmq/releases/download/${ver}"
+      remote_version="${ver}"
+      ;;
+  esac
+}
+
 update_scripts() {
   curl --proto '=https' --tlsv1.2 -sSf -L "$scripts_update" -o "$path_tmp_bin_update" && chmod +x "$path_tmp_bin_update"
   curl --proto '=https' --tlsv1.2 -sSf -L "$scripts_uninstall" -o "$path_tmp_bin_uninstall" && chmod +x "$path_tmp_bin_uninstall"
@@ -137,8 +150,6 @@ update_bins() {
   eval "bin=\$bin_${1}"
   eval "path_bin=\$path_bin_${1}"
 
-  remote_version="$(curl --proto '=https' --tlsv1.2 -sSf -L https://api.github.com/repos/simplex-chat/simplexmq/releases/latest | grep -i "tag_name" | awk -F \" '{print $4}')"
-
   set_ver() {
     local_version='unset'
     sed -i -- "s/local_version_${1}=.*/local_version_${1}='${remote_version}'/" "$path_conf_info/release"
@@ -192,6 +203,7 @@ checks() {
     exit 1
   fi
 
+  set_version
   os_test
   installed_test
 

scripts/main/smp-server.service

@@ -5,11 +5,22 @@ Description=SMP server
 User=smp
 Group=smp
 Type=simple
+
 ExecStart=/usr/local/bin/smp-server start +RTS -N -RTS 
 ExecStopPost=/usr/local/bin/simplex-servers-stopscript smp-server
+
 LimitNOFILE=65535
 KillSignal=SIGINT
+
+TimeoutStartSec=infinity
 TimeoutStopSec=infinity
 
+Restart=on-failure
+RestartSec=10s
+StartLimitBurst=3
+StartLimitInterval=60s
+
+AmbientCapabilities=CAP_NET_BIND_SERVICE
+
 [Install]
 WantedBy=multi-user.target

scripts/main/xftp-server.service

@@ -5,11 +5,21 @@ Description=XFTP server
 User=xftp
 Group=xftp
 Type=simple
+
 ExecStart=/usr/local/bin/xftp-server start +RTS -N -RTS
 ExecStopPost=/usr/local/bin/simplex-servers-stopscript xftp-server
+
 LimitNOFILE=65535
 KillSignal=SIGINT
+
+TimeoutStartSec=infinity
 TimeoutStopSec=infinity
+
+Restart=on-failure
+RestartSec=10s
+StartLimitBurst=3
+StartLimitInterval=60s
+
 AmbientCapabilities=CAP_NET_BIND_SERVICE
    
 [Install]

simplexmq.cabal

@@ -1,11 +1,7 @@
 cabal-version: 1.12
 
--- This file has been generated from package.yaml by hpack version 0.35.0.
---
--- see: https://github.com/sol/hpack
-
 name:           simplexmq
-version:        6.0.2.0
+version:        6.3.0.3
 synopsis:       SimpleXMQ message broker
 description:    This package includes <./docs/Simplex-Messaging-Server.html server>,
                 <./docs/Simplex-Messaging-Client.html client> and
@@ -66,24 +62,26 @@ flag use_crypton
   manual: True
   default: True
 
+flag client_library
+  description: Don't build server-related code.
+  manual: True
+  default: False
+
+flag client_postgres
+  description: Build with PostgreSQL instead of SQLite.
+  manual: True
+  default: False
+
 library
   exposed-modules:
       Simplex.FileTransfer.Agent
       Simplex.FileTransfer.Chunks
       Simplex.FileTransfer.Client
       Simplex.FileTransfer.Client.Agent
-      Simplex.FileTransfer.Client.Main
       Simplex.FileTransfer.Client.Presets
       Simplex.FileTransfer.Crypto
       Simplex.FileTransfer.Description
       Simplex.FileTransfer.Protocol
-      Simplex.FileTransfer.Server
-      Simplex.FileTransfer.Server.Control
-      Simplex.FileTransfer.Server.Env
-      Simplex.FileTransfer.Server.Main
-      Simplex.FileTransfer.Server.Stats
-      Simplex.FileTransfer.Server.Store
-      Simplex.FileTransfer.Server.StoreLog
       Simplex.FileTransfer.Transport
       Simplex.FileTransfer.Types
       Simplex.FileTransfer.Util
@@ -97,44 +95,12 @@ library
       Simplex.Messaging.Agent.RetryInterval
       Simplex.Messaging.Agent.Stats
       Simplex.Messaging.Agent.Store
-      Simplex.Messaging.Agent.Store.SQLite
-      Simplex.Messaging.Agent.Store.SQLite.Common
-      Simplex.Messaging.Agent.Store.SQLite.DB
-      Simplex.Messaging.Agent.Store.SQLite.Migrations
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220101_initial
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220301_snd_queue_keys
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220322_notifications
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220608_v2
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220625_v2_ntf_mode
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220811_onion_hosts
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220817_connection_ntfs
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220905_commands
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220915_connection_queues
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230110_users
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230117_fkey_indexes
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230120_delete_errors
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230217_server_key_hash
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230223_files
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230320_retry_state
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230401_snd_files
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230510_files_pending_replicas_indexes
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230516_encrypted_rcv_message_hashes
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230531_switch_status
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230615_ratchet_sync
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230701_delivery_receipts
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230720_delete_expired_messages
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230722_indexes
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230814_indexes
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230829_crypto_files
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20231222_command_created_at
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20231225_failed_work_items
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240121_message_delivery_indexes
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240124_file_redirect
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240223_connections_wait_delivery
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240225_ratchet_kem
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240417_rcv_files_approved_relays
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240624_snd_secure
-      Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240702_servers_stats
+      Simplex.Messaging.Agent.Store.AgentStore
+      Simplex.Messaging.Agent.Store.Common
+      Simplex.Messaging.Agent.Store.DB
+      Simplex.Messaging.Agent.Store.Interface
+      Simplex.Messaging.Agent.Store.Migrations
+      Simplex.Messaging.Agent.Store.Shared
       Simplex.Messaging.Agent.TRcvQueues
       Simplex.Messaging.Client
       Simplex.Messaging.Client.Agent
@@ -152,32 +118,12 @@ library
       Simplex.Messaging.Encoding.String
       Simplex.Messaging.Notifications.Client
       Simplex.Messaging.Notifications.Protocol
-      Simplex.Messaging.Notifications.Server
-      Simplex.Messaging.Notifications.Server.Env
-      Simplex.Messaging.Notifications.Server.Main
-      Simplex.Messaging.Notifications.Server.Push.APNS
-      Simplex.Messaging.Notifications.Server.Push.APNS.Internal
-      Simplex.Messaging.Notifications.Server.Stats
-      Simplex.Messaging.Notifications.Server.Store
-      Simplex.Messaging.Notifications.Server.StoreLog
       Simplex.Messaging.Notifications.Transport
       Simplex.Messaging.Notifications.Types
       Simplex.Messaging.Parsers
       Simplex.Messaging.Protocol
-      Simplex.Messaging.Server
-      Simplex.Messaging.Server.CLI
-      Simplex.Messaging.Server.Control
-      Simplex.Messaging.Server.Env.STM
       Simplex.Messaging.Server.Expiration
-      Simplex.Messaging.Server.Information
-      Simplex.Messaging.Server.Main
-      Simplex.Messaging.Server.MsgStore
-      Simplex.Messaging.Server.MsgStore.STM
-      Simplex.Messaging.Server.QueueStore
       Simplex.Messaging.Server.QueueStore.QueueInfo
-      Simplex.Messaging.Server.QueueStore.STM
-      Simplex.Messaging.Server.Stats
-      Simplex.Messaging.Server.StoreLog
       Simplex.Messaging.ServiceScheme
       Simplex.Messaging.Session
       Simplex.Messaging.TMap
@@ -191,7 +137,6 @@ library
       Simplex.Messaging.Transport.HTTP2.Server
       Simplex.Messaging.Transport.KeepAlive
       Simplex.Messaging.Transport.Server
-      Simplex.Messaging.Transport.WebSockets
       Simplex.Messaging.Util
       Simplex.Messaging.Version
       Simplex.Messaging.Version.Internal
@@ -200,13 +145,103 @@ library
       Simplex.RemoteControl.Discovery.Multicast
       Simplex.RemoteControl.Invitation
       Simplex.RemoteControl.Types
+  if flag(client_postgres)
+      exposed-modules:
+          Simplex.Messaging.Agent.Store.Postgres
+          Simplex.Messaging.Agent.Store.Postgres.Common
+          Simplex.Messaging.Agent.Store.Postgres.DB
+          Simplex.Messaging.Agent.Store.Postgres.Migrations
+          Simplex.Messaging.Agent.Store.Postgres.Migrations.M20241210_initial
+      if !flag(client_library)
+          exposed-modules:
+              Simplex.Messaging.Agent.Store.Postgres.Util
+  else
+      exposed-modules:
+          Simplex.Messaging.Agent.Store.SQLite
+          Simplex.Messaging.Agent.Store.SQLite.Common
+          Simplex.Messaging.Agent.Store.SQLite.DB
+          Simplex.Messaging.Agent.Store.SQLite.Migrations
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220101_initial
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220301_snd_queue_keys
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220322_notifications
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220608_v2
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220625_v2_ntf_mode
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220811_onion_hosts
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220817_connection_ntfs
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220905_commands
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220915_connection_queues
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230110_users
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230117_fkey_indexes
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230120_delete_errors
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230217_server_key_hash
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230223_files
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230320_retry_state
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230401_snd_files
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230510_files_pending_replicas_indexes
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230516_encrypted_rcv_message_hashes
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230531_switch_status
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230615_ratchet_sync
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230701_delivery_receipts
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230720_delete_expired_messages
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230722_indexes
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230814_indexes
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230829_crypto_files
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20231222_command_created_at
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20231225_failed_work_items
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240121_message_delivery_indexes
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240124_file_redirect
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240223_connections_wait_delivery
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240225_ratchet_kem
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240417_rcv_files_approved_relays
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240624_snd_secure
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240702_servers_stats
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240930_ntf_tokens_to_delete
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20241007_rcv_queues_last_broker_ts
+          Simplex.Messaging.Agent.Store.SQLite.Migrations.M20241224_ratchet_e2e_snd_params
+  if !flag(client_library)
+      exposed-modules:
+          Simplex.FileTransfer.Client.Main
+          Simplex.FileTransfer.Server
+          Simplex.FileTransfer.Server.Control
+          Simplex.FileTransfer.Server.Env
+          Simplex.FileTransfer.Server.Main
+          Simplex.FileTransfer.Server.Stats
+          Simplex.FileTransfer.Server.Store
+          Simplex.FileTransfer.Server.StoreLog
+          Simplex.Messaging.Notifications.Server
+          Simplex.Messaging.Notifications.Server.Control
+          Simplex.Messaging.Notifications.Server.Env
+          Simplex.Messaging.Notifications.Server.Main
+          Simplex.Messaging.Notifications.Server.Push.APNS
+          Simplex.Messaging.Notifications.Server.Push.APNS.Internal
+          Simplex.Messaging.Notifications.Server.Stats
+          Simplex.Messaging.Notifications.Server.Store
+          Simplex.Messaging.Notifications.Server.StoreLog
+          Simplex.Messaging.Server
+          Simplex.Messaging.Server.CLI
+          Simplex.Messaging.Server.Control
+          Simplex.Messaging.Server.Env.STM
+          Simplex.Messaging.Server.Information
+          Simplex.Messaging.Server.Main
+          Simplex.Messaging.Server.MsgStore
+          Simplex.Messaging.Server.MsgStore.Journal
+          Simplex.Messaging.Server.MsgStore.STM
+          Simplex.Messaging.Server.MsgStore.Types
+          Simplex.Messaging.Server.NtfStore
+          Simplex.Messaging.Server.Prometheus
+          Simplex.Messaging.Server.QueueStore
+          Simplex.Messaging.Server.QueueStore.STM
+          Simplex.Messaging.Server.Stats
+          Simplex.Messaging.Server.StoreLog
+          Simplex.Messaging.Server.StoreLog.Types
+          Simplex.Messaging.Transport.WebSockets
   other-modules:
       Paths_simplexmq
   hs-source-dirs:
       src
   default-extensions:
       StrictData
-  ghc-options: -Weverything -Wno-missing-exported-signatures -Wno-missing-import-lists -Wno-missed-specialisations -Wno-all-missed-specialisations -Wno-unsafe -Wno-safe -Wno-missing-local-signatures -Wno-missing-kind-signatures -Wno-missing-deriving-strategies -Wno-monomorphism-restriction -Wno-prepositive-qualified-module -Wno-unused-packages -Wno-implicit-prelude -Wno-missing-safe-haskell-mode -Wno-missing-export-lists -Wno-partial-fields -Wcompat -Werror=incomplete-record-updates -Werror=incomplete-patterns -Werror=incomplete-uni-patterns -Werror=missing-methods -Werror=tabs -Wredundant-constraints -Wincomplete-record-updates -Wunused-type-patterns -O2
+  ghc-options: -Weverything -Wno-missing-exported-signatures -Wno-missing-import-lists -Wno-missed-specialisations -Wno-all-missed-specialisations -Wno-unsafe -Wno-safe -Wno-missing-local-signatures -Wno-missing-kind-signatures -Wno-missing-deriving-strategies -Wno-monomorphism-restriction -Wno-prepositive-qualified-module -Wno-implicit-prelude -Wno-missing-safe-haskell-mode -Wno-missing-export-lists -Wno-partial-fields -Wcompat -Werror=incomplete-record-updates -Werror=incomplete-patterns -Werror=incomplete-uni-patterns -Werror=missing-home-modules -Werror=missing-methods -Werror=tabs -Wredundant-constraints -Wincomplete-record-updates -Wunused-type-patterns -O2
   include-dirs:
       cbits
   c-sources:
@@ -216,14 +251,12 @@ library
       crypto
   build-depends:
       aeson ==2.2.*
-    , ansi-terminal >=0.10 && <0.12
     , asn1-encoding ==0.9.*
     , asn1-types ==0.3.*
     , async ==2.2.*
     , attoparsec ==0.14.*
     , base >=4.14 && <5
     , base64-bytestring >=1.0 && <1.3
-    , case-insensitive ==1.2.*
     , composition ==1.0.*
     , constraints >=0.12 && <0.14
     , containers ==0.6.*
@@ -233,7 +266,6 @@ library
     , crypton-x509-validation ==1.6.*
     , cryptostore ==0.3.*
     , data-default ==0.7.*
-    , direct-sqlcipher ==2.3.*
     , directory ==1.3.*
     , filepath ==1.4.*
     , hourglass ==0.2.*
@@ -253,7 +285,6 @@ library
     , random >=1.1 && <1.3
     , simple-logger ==0.1.*
     , socks ==0.6.*
-    , sqlcipher-simple ==0.4.*
     , stm ==2.5.*
     , temporary ==1.3.*
     , time ==1.12.*
@@ -262,24 +293,38 @@ library
     , transformers ==0.6.*
     , unliftio ==0.2.*
     , unliftio-core ==0.2.*
-    , websockets ==0.12.*
     , yaml ==0.11.*
     , zstd ==0.1.3.*
   default-language: Haskell2010
   if flag(swift)
     cpp-options: -DswiftJSON
+  if !flag(client_library)
+    build-depends:
+        case-insensitive ==1.2.*
+      , hashable ==1.4.*
+      , websockets ==0.12.*
+  if flag(client_postgres)
+    build-depends:
+        postgresql-libpq >=0.10.0.0
+      , postgresql-simple ==0.7.*
+      , raw-strings-qq ==1.1.*
+    cpp-options: -DdbPostgres
+  else
+    build-depends:
+        direct-sqlcipher ==2.3.*
+      , sqlcipher-simple ==0.4.*
   if impl(ghc >= 9.6.2)
     build-depends:
         bytestring ==0.11.*
-      , template-haskell ==2.20.*
       , text >=2.0.1 && <2.2
   if impl(ghc < 9.6.2)
     build-depends:
         bytestring ==0.10.*
-      , template-haskell ==2.16.*
       , text >=1.2.3.0 && <1.3
 
 executable ntf-server
+  if flag(client_library)
+      buildable: False
   main-is: Main.hs
   other-modules:
       Paths_simplexmq
@@ -287,74 +332,16 @@ executable ntf-server
       apps/ntf-server
   default-extensions:
       StrictData
-  ghc-options: -Weverything -Wno-missing-exported-signatures -Wno-missing-import-lists -Wno-missed-specialisations -Wno-all-missed-specialisations -Wno-unsafe -Wno-safe -Wno-missing-local-signatures -Wno-missing-kind-signatures -Wno-missing-deriving-strategies -Wno-monomorphism-restriction -Wno-prepositive-qualified-module -Wno-unused-packages -Wno-implicit-prelude -Wno-missing-safe-haskell-mode -Wno-missing-export-lists -Wno-partial-fields -Wcompat -Werror=incomplete-record-updates -Werror=incomplete-patterns -Werror=incomplete-uni-patterns -Werror=missing-methods -Werror=tabs -Wredundant-constraints -Wincomplete-record-updates -Wunused-type-patterns -O2 -threaded -rtsopts
+  ghc-options: -Weverything -Wno-missing-exported-signatures -Wno-missing-import-lists -Wno-missed-specialisations -Wno-all-missed-specialisations -Wno-unsafe -Wno-safe -Wno-missing-local-signatures -Wno-missing-kind-signatures -Wno-missing-deriving-strategies -Wno-monomorphism-restriction -Wno-prepositive-qualified-module -Wno-implicit-prelude -Wno-missing-safe-haskell-mode -Wno-missing-export-lists -Wno-partial-fields -Wcompat -Werror=incomplete-record-updates -Werror=incomplete-patterns -Werror=incomplete-uni-patterns -Werror=missing-methods -Werror=tabs -Wredundant-constraints -Wincomplete-record-updates -Wunused-type-patterns -O2 -threaded -rtsopts
   build-depends:
-      aeson ==2.2.*
-    , ansi-terminal >=0.10 && <0.12
-    , asn1-encoding ==0.9.*
-    , asn1-types ==0.3.*
-    , async ==2.2.*
-    , attoparsec ==0.14.*
-    , base >=4.14 && <5
-    , base64-bytestring >=1.0 && <1.3
-    , case-insensitive ==1.2.*
-    , composition ==1.0.*
-    , constraints >=0.12 && <0.14
-    , containers ==0.6.*
-    , crypton ==0.34.*
-    , crypton-x509 ==1.7.*
-    , crypton-x509-store ==1.6.*
-    , crypton-x509-validation ==1.6.*
-    , cryptostore ==0.3.*
-    , data-default ==0.7.*
-    , direct-sqlcipher ==2.3.*
-    , directory ==1.3.*
-    , filepath ==1.4.*
-    , hourglass ==0.2.*
-    , http-types ==0.12.*
-    , http2 >=4.2.2 && <4.3
-    , ini ==0.4.1
-    , iproute ==1.7.*
-    , iso8601-time ==0.1.*
-    , memory ==0.18.*
-    , mtl >=2.3.1 && <3.0
-    , network >=3.1.2.7 && <3.2
-    , network-info ==0.2.*
-    , network-transport ==0.5.6
-    , network-udp ==0.0.*
-    , optparse-applicative >=0.15 && <0.17
-    , process ==1.6.*
-    , random >=1.1 && <1.3
-    , simple-logger ==0.1.*
+      base
+    , simple-logger
     , simplexmq
-    , socks ==0.6.*
-    , sqlcipher-simple ==0.4.*
-    , stm ==2.5.*
-    , temporary ==1.3.*
-    , time ==1.12.*
-    , time-manager ==0.0.*
-    , tls >=1.9.0 && <1.10
-    , transformers ==0.6.*
-    , unliftio ==0.2.*
-    , unliftio-core ==0.2.*
-    , websockets ==0.12.*
-    , yaml ==0.11.*
-    , zstd ==0.1.3.*
   default-language: Haskell2010
-  if flag(swift)
-    cpp-options: -DswiftJSON
-  if impl(ghc >= 9.6.2)
-    build-depends:
-        bytestring ==0.11.*
-      , template-haskell ==2.20.*
-      , text >=2.0.1 && <2.2
-  if impl(ghc < 9.6.2)
-    build-depends:
-        bytestring ==0.10.*
-      , template-haskell ==2.16.*
-      , text >=1.2.3.0 && <1.3
 
 executable smp-server
+  if flag(client_library)
+      buildable: False
   main-is: Main.hs
   other-modules:
       Static
@@ -365,78 +352,27 @@ executable smp-server
       apps/smp-server/web
   default-extensions:
       StrictData
-  ghc-options: -Weverything -Wno-missing-exported-signatures -Wno-missing-import-lists -Wno-missed-specialisations -Wno-all-missed-specialisations -Wno-unsafe -Wno-safe -Wno-missing-local-signatures -Wno-missing-kind-signatures -Wno-missing-deriving-strategies -Wno-monomorphism-restriction -Wno-prepositive-qualified-module -Wno-unused-packages -Wno-implicit-prelude -Wno-missing-safe-haskell-mode -Wno-missing-export-lists -Wno-partial-fields -Wcompat -Werror=incomplete-record-updates -Werror=incomplete-patterns -Werror=incomplete-uni-patterns -Werror=missing-methods -Werror=tabs -Wredundant-constraints -Wincomplete-record-updates -Wunused-type-patterns -O2 -threaded -rtsopts
+  ghc-options: -Weverything -Wno-missing-exported-signatures -Wno-missing-import-lists -Wno-missed-specialisations -Wno-all-missed-specialisations -Wno-unsafe -Wno-safe -Wno-missing-local-signatures -Wno-missing-kind-signatures -Wno-missing-deriving-strategies -Wno-monomorphism-restriction -Wno-prepositive-qualified-module -Wno-implicit-prelude -Wno-missing-safe-haskell-mode -Wno-missing-export-lists -Wno-partial-fields -Wcompat -Werror=incomplete-record-updates -Werror=incomplete-patterns -Werror=incomplete-uni-patterns -Werror=missing-methods -Werror=tabs -Wredundant-constraints -Wincomplete-record-updates -Wunused-type-patterns -O2 -threaded -rtsopts
   build-depends:
-      aeson ==2.2.*
-    , ansi-terminal >=0.10 && <0.12
-    , asn1-encoding ==0.9.*
-    , asn1-types ==0.3.*
-    , async ==2.2.*
-    , attoparsec ==0.14.*
-    , base >=4.14 && <5
-    , base64-bytestring >=1.0 && <1.3
-    , case-insensitive ==1.2.*
-    , composition ==1.0.*
-    , constraints >=0.12 && <0.14
-    , containers ==0.6.*
-    , crypton ==0.34.*
-    , crypton-x509 ==1.7.*
-    , crypton-x509-store ==1.6.*
-    , crypton-x509-validation ==1.6.*
-    , cryptostore ==0.3.*
-    , data-default ==0.7.*
-    , direct-sqlcipher ==2.3.*
-    , directory ==1.3.*
+      base
+    , bytestring
+    , directory
     , file-embed
-    , filepath ==1.4.*
-    , hourglass ==0.2.*
-    , http-types ==0.12.*
-    , http2 >=4.2.2 && <4.3
-    , ini ==0.4.1
-    , iproute ==1.7.*
-    , iso8601-time ==0.1.*
-    , memory ==0.18.*
-    , mtl >=2.3.1 && <3.0
-    , network >=3.1.2.7 && <3.2
-    , network-info ==0.2.*
-    , network-transport ==0.5.6
-    , network-udp ==0.0.*
-    , optparse-applicative >=0.15 && <0.17
-    , process ==1.6.*
-    , random >=1.1 && <1.3
-    , simple-logger ==0.1.*
+    , filepath
+    , network
+    , simple-logger
     , simplexmq
-    , socks ==0.6.*
-    , sqlcipher-simple ==0.4.*
-    , stm ==2.5.*
-    , temporary ==1.3.*
-    , time ==1.12.*
-    , time-manager ==0.0.*
-    , tls >=1.9.0 && <1.10
-    , transformers ==0.6.*
-    , unliftio ==0.2.*
-    , unliftio-core ==0.2.*
+    , text
+    , unliftio
+    , wai
     , wai-app-static
-    , warp
-    , warp-tls
-    , websockets ==0.12.*
-    , yaml ==0.11.*
-    , zstd ==0.1.3.*
+    , warp ==3.3.30
+    , warp-tls ==3.4.7
   default-language: Haskell2010
-  if flag(swift)
-    cpp-options: -DswiftJSON
-  if impl(ghc >= 9.6.2)
-    build-depends:
-        bytestring ==0.11.*
-      , template-haskell ==2.20.*
-      , text >=2.0.1 && <2.2
-  if impl(ghc < 9.6.2)
-    build-depends:
-        bytestring ==0.10.*
-      , template-haskell ==2.16.*
-      , text >=1.2.3.0 && <1.3
 
 executable xftp
+  if flag(client_library)
+      buildable: False
   main-is: Main.hs
   other-modules:
       Paths_simplexmq
@@ -444,74 +380,15 @@ executable xftp
       apps/xftp
   default-extensions:
       StrictData
-  ghc-options: -Weverything -Wno-missing-exported-signatures -Wno-missing-import-lists -Wno-missed-specialisations -Wno-all-missed-specialisations -Wno-unsafe -Wno-safe -Wno-missing-local-signatures -Wno-missing-kind-signatures -Wno-missing-deriving-strategies -Wno-monomorphism-restriction -Wno-prepositive-qualified-module -Wno-unused-packages -Wno-implicit-prelude -Wno-missing-safe-haskell-mode -Wno-missing-export-lists -Wno-partial-fields -Wcompat -Werror=incomplete-record-updates -Werror=incomplete-patterns -Werror=incomplete-uni-patterns -Werror=missing-methods -Werror=tabs -Wredundant-constraints -Wincomplete-record-updates -Wunused-type-patterns -O2 -threaded -rtsopts
+  ghc-options: -Weverything -Wno-missing-exported-signatures -Wno-missing-import-lists -Wno-missed-specialisations -Wno-all-missed-specialisations -Wno-unsafe -Wno-safe -Wno-missing-local-signatures -Wno-missing-kind-signatures -Wno-missing-deriving-strategies -Wno-monomorphism-restriction -Wno-prepositive-qualified-module -Wno-implicit-prelude -Wno-missing-safe-haskell-mode -Wno-missing-export-lists -Wno-partial-fields -Wcompat -Werror=incomplete-record-updates -Werror=incomplete-patterns -Werror=incomplete-uni-patterns -Werror=missing-methods -Werror=tabs -Wredundant-constraints -Wincomplete-record-updates -Wunused-type-patterns -O2 -threaded -rtsopts
   build-depends:
-      aeson ==2.2.*
-    , ansi-terminal >=0.10 && <0.12
-    , asn1-encoding ==0.9.*
-    , asn1-types ==0.3.*
-    , async ==2.2.*
-    , attoparsec ==0.14.*
-    , base >=4.14 && <5
-    , base64-bytestring >=1.0 && <1.3
-    , case-insensitive ==1.2.*
-    , composition ==1.0.*
-    , constraints >=0.12 && <0.14
-    , containers ==0.6.*
-    , crypton ==0.34.*
-    , crypton-x509 ==1.7.*
-    , crypton-x509-store ==1.6.*
-    , crypton-x509-validation ==1.6.*
-    , cryptostore ==0.3.*
-    , data-default ==0.7.*
-    , direct-sqlcipher ==2.3.*
-    , directory ==1.3.*
-    , filepath ==1.4.*
-    , hourglass ==0.2.*
-    , http-types ==0.12.*
-    , http2 >=4.2.2 && <4.3
-    , ini ==0.4.1
-    , iproute ==1.7.*
-    , iso8601-time ==0.1.*
-    , memory ==0.18.*
-    , mtl >=2.3.1 && <3.0
-    , network >=3.1.2.7 && <3.2
-    , network-info ==0.2.*
-    , network-transport ==0.5.6
-    , network-udp ==0.0.*
-    , optparse-applicative >=0.15 && <0.17
-    , process ==1.6.*
-    , random >=1.1 && <1.3
-    , simple-logger ==0.1.*
+      base
     , simplexmq
-    , socks ==0.6.*
-    , sqlcipher-simple ==0.4.*
-    , stm ==2.5.*
-    , temporary ==1.3.*
-    , time ==1.12.*
-    , time-manager ==0.0.*
-    , tls >=1.9.0 && <1.10
-    , transformers ==0.6.*
-    , unliftio ==0.2.*
-    , unliftio-core ==0.2.*
-    , websockets ==0.12.*
-    , yaml ==0.11.*
-    , zstd ==0.1.3.*
   default-language: Haskell2010
-  if flag(swift)
-    cpp-options: -DswiftJSON
-  if impl(ghc >= 9.6.2)
-    build-depends:
-        bytestring ==0.11.*
-      , template-haskell ==2.20.*
-      , text >=2.0.1 && <2.2
-  if impl(ghc < 9.6.2)
-    build-depends:
-        bytestring ==0.10.*
-      , template-haskell ==2.16.*
-      , text >=1.2.3.0 && <1.3
 
 executable xftp-server
+  if flag(client_library)
+      buildable: False
   main-is: Main.hs
   other-modules:
       Paths_simplexmq
@@ -519,74 +396,16 @@ executable xftp-server
       apps/xftp-server
   default-extensions:
       StrictData
-  ghc-options: -Weverything -Wno-missing-exported-signatures -Wno-missing-import-lists -Wno-missed-specialisations -Wno-all-missed-specialisations -Wno-unsafe -Wno-safe -Wno-missing-local-signatures -Wno-missing-kind-signatures -Wno-missing-deriving-strategies -Wno-monomorphism-restriction -Wno-prepositive-qualified-module -Wno-unused-packages -Wno-implicit-prelude -Wno-missing-safe-haskell-mode -Wno-missing-export-lists -Wno-partial-fields -Wcompat -Werror=incomplete-record-updates -Werror=incomplete-patterns -Werror=incomplete-uni-patterns -Werror=missing-methods -Werror=tabs -Wredundant-constraints -Wincomplete-record-updates -Wunused-type-patterns -O2 -threaded -rtsopts
+  ghc-options: -Weverything -Wno-missing-exported-signatures -Wno-missing-import-lists -Wno-missed-specialisations -Wno-all-missed-specialisations -Wno-unsafe -Wno-safe -Wno-missing-local-signatures -Wno-missing-kind-signatures -Wno-missing-deriving-strategies -Wno-monomorphism-restriction -Wno-prepositive-qualified-module -Wno-implicit-prelude -Wno-missing-safe-haskell-mode -Wno-missing-export-lists -Wno-partial-fields -Wcompat -Werror=incomplete-record-updates -Werror=incomplete-patterns -Werror=incomplete-uni-patterns -Werror=missing-methods -Werror=tabs -Wredundant-constraints -Wincomplete-record-updates -Wunused-type-patterns -O2 -threaded -rtsopts
   build-depends:
-      aeson ==2.2.*
-    , ansi-terminal >=0.10 && <0.12
-    , asn1-encoding ==0.9.*
-    , asn1-types ==0.3.*
-    , async ==2.2.*
-    , attoparsec ==0.14.*
-    , base >=4.14 && <5
-    , base64-bytestring >=1.0 && <1.3
-    , case-insensitive ==1.2.*
-    , composition ==1.0.*
-    , constraints >=0.12 && <0.14
-    , containers ==0.6.*
-    , crypton ==0.34.*
-    , crypton-x509 ==1.7.*
-    , crypton-x509-store ==1.6.*
-    , crypton-x509-validation ==1.6.*
-    , cryptostore ==0.3.*
-    , data-default ==0.7.*
-    , direct-sqlcipher ==2.3.*
-    , directory ==1.3.*
-    , filepath ==1.4.*
-    , hourglass ==0.2.*
-    , http-types ==0.12.*
-    , http2 >=4.2.2 && <4.3
-    , ini ==0.4.1
-    , iproute ==1.7.*
-    , iso8601-time ==0.1.*
-    , memory ==0.18.*
-    , mtl >=2.3.1 && <3.0
-    , network >=3.1.2.7 && <3.2
-    , network-info ==0.2.*
-    , network-transport ==0.5.6
-    , network-udp ==0.0.*
-    , optparse-applicative >=0.15 && <0.17
-    , process ==1.6.*
-    , random >=1.1 && <1.3
-    , simple-logger ==0.1.*
+      base
+    , simple-logger
     , simplexmq
-    , socks ==0.6.*
-    , sqlcipher-simple ==0.4.*
-    , stm ==2.5.*
-    , temporary ==1.3.*
-    , time ==1.12.*
-    , time-manager ==0.0.*
-    , tls >=1.9.0 && <1.10
-    , transformers ==0.6.*
-    , unliftio ==0.2.*
-    , unliftio-core ==0.2.*
-    , websockets ==0.12.*
-    , yaml ==0.11.*
-    , zstd ==0.1.3.*
   default-language: Haskell2010
-  if flag(swift)
-    cpp-options: -DswiftJSON
-  if impl(ghc >= 9.6.2)
-    build-depends:
-        bytestring ==0.11.*
-      , template-haskell ==2.20.*
-      , text >=2.0.1 && <2.2
-  if impl(ghc < 9.6.2)
-    build-depends:
-        bytestring ==0.10.*
-      , template-haskell ==2.16.*
-      , text >=1.2.3.0 && <1.3
 
 test-suite simplexmq-test
+  if flag(client_library)
+      buildable: False
   type: exitcode-stdio-1.0
   main-is: Test.hs
   other-modules:
@@ -597,18 +416,21 @@ test-suite simplexmq-test
       AgentTests.FunctionalAPITests
       AgentTests.MigrationTests
       AgentTests.NotificationTests
-      AgentTests.SchemaDump
-      AgentTests.SQLiteTests
+      AgentTests.ServerChoice
       CLITests
       CoreTests.BatchingTests
       CoreTests.CryptoFileTests
       CoreTests.CryptoTests
       CoreTests.EncodingTests
+      CoreTests.MsgStoreTests
       CoreTests.RetryIntervalTests
+      CoreTests.SOCKSSettings
+      CoreTests.StoreLogTests
       CoreTests.TRcvQueuesTests
       CoreTests.UtilTests
       CoreTests.VersionRangeTests
       FileDescriptionTests
+      Fixtures
       NtfClient
       NtfServerTests
       RemoteControl
@@ -621,83 +443,73 @@ test-suite simplexmq-test
       XFTPCLI
       XFTPClient
       XFTPServerTests
+      Static
+      Static.Embedded
       Paths_simplexmq
+  if !flag(client_postgres)
+      other-modules:
+          AgentTests.SchemaDump
+          AgentTests.SQLiteTests
   hs-source-dirs:
       tests
+      apps/smp-server/web
   default-extensions:
       StrictData
-  ghc-options: -Weverything -Wno-missing-exported-signatures -Wno-missing-import-lists -Wno-missed-specialisations -Wno-all-missed-specialisations -Wno-unsafe -Wno-safe -Wno-missing-local-signatures -Wno-missing-kind-signatures -Wno-missing-deriving-strategies -Wno-monomorphism-restriction -Wno-prepositive-qualified-module -Wno-unused-packages -Wno-implicit-prelude -Wno-missing-safe-haskell-mode -Wno-missing-export-lists -Wno-partial-fields -Wcompat -Werror=incomplete-record-updates -Werror=incomplete-patterns -Werror=incomplete-uni-patterns -Werror=missing-methods -Werror=tabs -Wredundant-constraints -Wincomplete-record-updates -Wunused-type-patterns -O2 -threaded -rtsopts -with-rtsopts=-A64M -with-rtsopts=-N1
+  ghc-options: -Weverything -Wno-missing-exported-signatures -Wno-missing-import-lists -Wno-missed-specialisations -Wno-all-missed-specialisations -Wno-unsafe -Wno-safe -Wno-missing-local-signatures -Wno-missing-kind-signatures -Wno-missing-deriving-strategies -Wno-monomorphism-restriction -Wno-prepositive-qualified-module -Wno-implicit-prelude -Wno-missing-safe-haskell-mode -Wno-missing-export-lists -Wno-partial-fields -Wcompat -Werror=incomplete-record-updates -Werror=incomplete-patterns -Werror=incomplete-uni-patterns -Werror=missing-methods -Werror=tabs -Wredundant-constraints -Wincomplete-record-updates -Wunused-type-patterns -O2 -threaded -rtsopts -with-rtsopts=-A64M -with-rtsopts=-N1
   build-depends:
-      HUnit ==1.6.*
-    , QuickCheck ==2.14.*
-    , aeson ==2.2.*
-    , ansi-terminal >=0.10 && <0.12
-    , asn1-encoding ==0.9.*
-    , asn1-types ==0.3.*
-    , async ==2.2.*
-    , attoparsec ==0.14.*
-    , base >=4.14 && <5
-    , base64-bytestring >=1.0 && <1.3
-    , case-insensitive ==1.2.*
-    , composition ==1.0.*
-    , constraints >=0.12 && <0.14
-    , containers ==0.6.*
-    , crypton ==0.34.*
-    , crypton-x509 ==1.7.*
-    , crypton-x509-store ==1.6.*
-    , crypton-x509-validation ==1.6.*
-    , cryptostore ==0.3.*
-    , data-default ==0.7.*
+      base
+    , aeson
+    , async
+    , base64-bytestring
+    , bytestring
+    , containers
+    , crypton
+    , crypton-x509
+    , crypton-x509-store
+    , crypton-x509-validation
     , deepseq ==1.4.*
-    , direct-sqlcipher ==2.3.*
-    , directory ==1.3.*
-    , filepath ==1.4.*
+    , directory
+    , file-embed
+    , filepath
     , generic-random ==1.5.*
-    , hourglass ==0.2.*
+    , hashable
     , hspec ==2.11.*
-    , hspec-core ==2.11.*
-    , http-types ==0.12.*
-    , http2 >=4.2.2 && <4.3
-    , ini ==0.4.1
-    , iproute ==1.7.*
-    , iso8601-time ==0.1.*
+    , http-client
+    , http-types
+    , http2
+    , HUnit ==1.6.*
+    , ini
+    , iso8601-time
     , main-tester ==0.2.*
-    , memory ==0.18.*
-    , mtl >=2.3.1 && <3.0
-    , network >=3.1.2.7 && <3.2
-    , network-info ==0.2.*
-    , network-transport ==0.5.6
-    , network-udp ==0.0.*
-    , optparse-applicative >=0.15 && <0.17
-    , process ==1.6.*
-    , random >=1.1 && <1.3
+    , memory
+    , mtl
+    , network
+    , process
+    , QuickCheck ==2.14.*
+    , random
     , silently ==1.2.*
-    , simple-logger ==0.1.*
+    , simple-logger
     , simplexmq
-    , socks ==0.6.*
-    , sqlcipher-simple ==0.4.*
-    , stm ==2.5.*
-    , temporary ==1.3.*
-    , time ==1.12.*
-    , time-manager ==0.0.*
+    , stm
+    , text
+    , time
     , timeit ==2.0.*
-    , tls >=1.9.0 && <1.10
-    , transformers ==0.6.*
-    , unliftio ==0.2.*
-    , unliftio-core ==0.2.*
-    , websockets ==0.12.*
-    , yaml ==0.11.*
-    , zstd ==0.1.3.*
+    , transformers
+    , unliftio
+    , unliftio-core
+    , unordered-containers
+    , wai
+    , wai-app-static
+    , warp
+    , warp-tls
+    , yaml
   default-language: Haskell2010
-  if flag(swift)
-    cpp-options: -DswiftJSON
-  if impl(ghc >= 9.6.2)
+  if flag(client_postgres)
     build-depends:
-        bytestring ==0.11.*
-      , template-haskell ==2.20.*
-      , text >=2.0.1 && <2.2
-  if impl(ghc < 9.6.2)
+        postgresql-libpq >=0.10.0.0
+      , postgresql-simple ==0.7.*
+      , raw-strings-qq ==1.1.*
+    cpp-options: -DdbPostgres
+  else
     build-depends:
-        bytestring ==0.10.*
-      , template-haskell ==2.16.*
-      , text >=1.2.3.0 && <1.3
+        sqlcipher-simple

src/Simplex/FileTransfer/Agent.hs

@@ -45,14 +45,13 @@ import Data.List (foldl', partition, sortOn)
 import qualified Data.List.NonEmpty as L
 import Data.Map.Strict (Map)
 import qualified Data.Map.Strict as M
-import Data.Maybe (mapMaybe)
+import Data.Maybe (fromMaybe, mapMaybe)
 import qualified Data.Set as S
 import Data.Text (Text)
 import Data.Time.Clock (getCurrentTime)
 import Data.Time.Format (defaultTimeLocale, formatTime)
 import Simplex.FileTransfer.Chunks (toKB)
-import Simplex.FileTransfer.Client (XFTPChunkSpec (..))
-import Simplex.FileTransfer.Client.Main
+import Simplex.FileTransfer.Client (XFTPChunkSpec (..), getChunkDigest, prepareChunkSizes, prepareChunkSpecs, singleChunkSize)
 import Simplex.FileTransfer.Crypto
 import Simplex.FileTransfer.Description
 import Simplex.FileTransfer.Protocol (FileParty (..), SFileParty (..))
@@ -66,15 +65,15 @@ import Simplex.Messaging.Agent.Env.SQLite
 import Simplex.Messaging.Agent.Protocol
 import Simplex.Messaging.Agent.RetryInterval
 import Simplex.Messaging.Agent.Stats
-import Simplex.Messaging.Agent.Store.SQLite
-import qualified Simplex.Messaging.Agent.Store.SQLite.DB as DB
+import Simplex.Messaging.Agent.Store.AgentStore
+import qualified Simplex.Messaging.Agent.Store.DB as DB
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Crypto.File (CryptoFile (..), CryptoFileArgs)
 import qualified Simplex.Messaging.Crypto.File as CF
 import qualified Simplex.Messaging.Crypto.Lazy as LC
 import Simplex.Messaging.Encoding
 import Simplex.Messaging.Encoding.String (strDecode, strEncode)
-import Simplex.Messaging.Protocol (EntityId, ProtocolServer, ProtocolType (..), XFTPServer)
+import Simplex.Messaging.Protocol (ProtocolServer, ProtocolType (..), XFTPServer)
 import qualified Simplex.Messaging.TMap as TM
 import Simplex.Messaging.Util (catchAll_, liftError, tshow, unlessM, whenM)
 import System.FilePath (takeFileName, (</>))
@@ -190,8 +189,9 @@ runXFTPRcvWorker c srv Worker {doWork} = do
     runXFTPOperation :: AgentConfig -> AM ()
     runXFTPOperation AgentConfig {rcvFilesTTL, reconnectInterval = ri, xftpConsecutiveRetries} =
       withWork c doWork (\db -> getNextRcvChunkToDownload db srv rcvFilesTTL) $ \case
-        (RcvFileChunk {rcvFileId, rcvFileEntityId, fileTmpPath, replicas = []}, _) -> rcvWorkerInternalError c rcvFileId rcvFileEntityId (Just fileTmpPath) (INTERNAL "chunk has no replicas")
-        (fc@RcvFileChunk {userId, rcvFileId, rcvFileEntityId, digest, fileTmpPath, replicas = replica@RcvFileChunkReplica {rcvChunkReplicaId, server, delay} : _}, approvedRelays) -> do
+        (RcvFileChunk {rcvFileId, rcvFileEntityId, fileTmpPath, replicas = []}, _, redirectEntityId_) ->
+          rcvWorkerInternalError c rcvFileId rcvFileEntityId redirectEntityId_ (Just fileTmpPath) (INTERNAL "chunk has no replicas")
+        (fc@RcvFileChunk {userId, rcvFileId, rcvFileEntityId, digest, fileTmpPath, replicas = replica@RcvFileChunkReplica {rcvChunkReplicaId, server, delay} : _}, approvedRelays, redirectEntityId_) -> do
           let ri' = maybe ri (\d -> ri {initialInterval = d, increaseAfter = 0}) delay
           withRetryIntervalLimit xftpConsecutiveRetries ri' $ \delay' loop -> do
             liftIO $ waitWhileSuspended c
@@ -202,7 +202,7 @@ runXFTPRcvWorker c srv Worker {doWork} = do
           where
             retryLoop loop e replicaDelay = do
               flip catchAgentError (\_ -> pure ()) $ do
-                when (serverHostError e) $ notify c rcvFileEntityId $ RFWARN e
+                when (serverHostError e) $ notify c (fromMaybe rcvFileEntityId redirectEntityId_) (RFWARN e)
                 liftIO $ closeXFTPServerClient c userId server digest
                 withStore' c $ \db -> updateRcvChunkReplicaDelay db rcvChunkReplicaId replicaDelay
               liftIO $ assertAgentForeground c
@@ -211,7 +211,7 @@ runXFTPRcvWorker c srv Worker {doWork} = do
               atomically . incXFTPServerStat c userId srv $ case e of
                 XFTP _ XFTP.AUTH -> downloadAuthErrs
                 _ -> downloadErrs
-              rcvWorkerInternalError c rcvFileId rcvFileEntityId (Just fileTmpPath) e
+              rcvWorkerInternalError c rcvFileId rcvFileEntityId redirectEntityId_ (Just fileTmpPath) e
     downloadFileChunk :: RcvFileChunk -> RcvFileChunkReplica -> Bool -> AM ()
     downloadFileChunk RcvFileChunk {userId, rcvFileId, rcvFileEntityId, rcvChunkId, chunkNo, chunkSize, digest, fileTmpPath} replica approvedRelays = do
       unlessM ((approvedRelays ||) <$> ipAddressProtected') $ throwE $ FILE NOT_APPROVED
@@ -262,11 +262,11 @@ retryOnError name loop done e = do
     then loop
     else done
 
-rcvWorkerInternalError :: AgentClient -> DBRcvFileId -> RcvFileId -> Maybe FilePath -> AgentErrorType -> AM ()
-rcvWorkerInternalError c rcvFileId rcvFileEntityId tmpPath err = do
+rcvWorkerInternalError :: AgentClient -> DBRcvFileId -> RcvFileId -> Maybe RcvFileId -> Maybe FilePath -> AgentErrorType -> AM ()
+rcvWorkerInternalError c rcvFileId rcvFileEntityId redirectEntityId_ tmpPath err = do
   lift $ forM_ tmpPath (removePath <=< toFSFilePath)
   withStore' c $ \db -> updateRcvFileError db rcvFileId (show err)
-  notify c rcvFileEntityId $ RFERR err
+  notify c (fromMaybe rcvFileEntityId redirectEntityId_) (RFERR err)
 
 runXFTPRcvLocalWorker :: AgentClient -> Worker -> AM ()
 runXFTPRcvLocalWorker c Worker {doWork} = do
@@ -279,8 +279,8 @@ runXFTPRcvLocalWorker c Worker {doWork} = do
     runXFTPOperation :: AgentConfig -> AM ()
     runXFTPOperation AgentConfig {rcvFilesTTL} =
       withWork c doWork (`getNextRcvFileToDecrypt` rcvFilesTTL) $
-        \f@RcvFile {rcvFileId, rcvFileEntityId, tmpPath} ->
-          decryptFile f `catchAgentError` rcvWorkerInternalError c rcvFileId rcvFileEntityId tmpPath
+        \f@RcvFile {rcvFileId, rcvFileEntityId, tmpPath, redirect} ->
+          decryptFile f `catchAgentError` rcvWorkerInternalError c rcvFileId rcvFileEntityId (redirectEntityId <$> redirect) tmpPath
     decryptFile :: RcvFile -> AM ()
     decryptFile RcvFile {rcvFileId, rcvFileEntityId, size, digest, key, nonce, tmpPath, saveFile, status, chunks, redirect} = do
       let CryptoFile savePath cfArgs = saveFile
@@ -346,7 +346,7 @@ xftpDeleteRcvFiles' c rcvFileEntityIds = do
     batchFiles :: (DB.Connection -> DBRcvFileId -> IO a) -> [RcvFile] -> AM' [Either AgentErrorType a]
     batchFiles f rcvFiles = withStoreBatch' c $ \db -> map (\RcvFile {rcvFileId} -> f db rcvFileId) rcvFiles
 
-notify :: forall m e. (MonadIO m, AEntityI e) => AgentClient -> EntityId -> AEvent e -> m ()
+notify :: forall m e. (MonadIO m, AEntityI e) => AgentClient -> AEntityId -> AEvent e -> m ()
 notify c entId cmd = atomically $ writeTBQueue (subQ c) ("", entId, AEvt (sAEntity @e) cmd)
 
 xftpSendFile' :: AgentClient -> UserId -> CryptoFile -> Int -> AM SndFileId
@@ -460,14 +460,14 @@ runXFTPSndPrepareWorker c Worker {doWork} = do
           pure srv
           where
             tryCreate = do
-              usedSrvs <- newTVarIO ([] :: [XFTPServer])
+              triedHosts <- newTVarIO S.empty
               let AgentClient {xftpServers} = c
               userSrvCount <- liftIO $ length <$> TM.lookupIO userId xftpServers
               withRetryIntervalCount (riFast ri) $ \n _ loop -> do
                 liftIO $ waitWhileSuspended c
                 liftIO $ waitForUserNetwork c
                 let triedAllSrvs = n > userSrvCount
-                createWithNextSrv usedSrvs
+                createWithNextSrv triedHosts
                   `catchAgentError` \e -> retryOnError "XFTP prepare worker" (retryLoop loop triedAllSrvs e) (throwE e) e
               where
                 -- we don't do closeXFTPServerClient here to not risk closing connection for concurrent chunk upload
@@ -476,10 +476,10 @@ runXFTPSndPrepareWorker c Worker {doWork} = do
                     when (triedAllSrvs && serverHostError e) $ notify c sndFileEntityId $ SFWARN e
                   liftIO $ assertAgentForeground c
                   loop
-            createWithNextSrv usedSrvs = do
+            createWithNextSrv triedHosts = do
               deleted <- withStore' c $ \db -> getSndFileDeleted db sndFileId
               when deleted $ throwE $ FILE NO_FILE
-              withNextSrv c userId usedSrvs [] $ \srvAuth -> do
+              withNextSrv c userId storageSrvs triedHosts [] $ \srvAuth -> do
                 replica <- agentXFTPNewChunk c ch numRecipients' srvAuth
                 pure (replica, srvAuth)
 
@@ -545,8 +545,8 @@ runXFTPSndWorker c srv Worker {doWork} = do
         withStore' c $ \db -> updateSndFileComplete db sndFileId
       where
         addRecipients :: SndFileChunk -> SndFileChunkReplica -> AM SndFileChunkReplica
-        addRecipients ch@SndFileChunk {numRecipients} cr@SndFileChunkReplica {rcvIdsKeys}
-          | length rcvIdsKeys > numRecipients = throwE $ INTERNAL "too many recipients"
+        addRecipients ch@SndFileChunk {numRecipients} cr@SndFileChunkReplica {sndChunkReplicaId, rcvIdsKeys}
+          | length rcvIdsKeys > numRecipients = throwE $ INTERNAL ("too many recipients, sndChunkReplicaId = " <> show sndChunkReplicaId)
           | length rcvIdsKeys == numRecipients = pure cr
           | otherwise = do
               let numRecipients' = min (numRecipients - length rcvIdsKeys) maxRecipients

src/Simplex/FileTransfer/Client.hs

@@ -20,15 +20,19 @@ import Data.Bifunctor (first)
 import Data.ByteString.Builder (Builder, byteString)
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
+import qualified Data.ByteString.Lazy as LB
 import Data.Int (Int64)
+import Data.List (foldl')
 import Data.List.NonEmpty (NonEmpty (..))
+import Data.Maybe (listToMaybe)
+import Data.Time.Clock (UTCTime)
 import Data.Word (Word32)
 import qualified Data.X509 as X
 import qualified Data.X509.Validation as XV
 import qualified Network.HTTP.Types as N
 import qualified Network.HTTP2.Client as H
+import Simplex.FileTransfer.Chunks
 import Simplex.FileTransfer.Protocol
-import Simplex.FileTransfer.Server.Env (supportedXFTPhandshakes)
 import Simplex.FileTransfer.Transport
 import Simplex.Messaging.Client
   ( NetworkConfig (..),
@@ -36,8 +40,8 @@ import Simplex.Messaging.Client
     TransportSession,
     chooseTransportHost,
     defaultNetworkConfig,
-    proxyUsername,
     transportClientConfig,
+    clientSocksCredentials,
     unexpectedResponse,
   )
 import qualified Simplex.Messaging.Crypto as C
@@ -50,8 +54,9 @@ import Simplex.Messaging.Protocol
     ProtocolServer (..),
     RecipientId,
     SenderId,
+    pattern NoEntity,
   )
-import Simplex.Messaging.Transport (ALPN, HandshakeError (..), THandleAuth (..), THandleParams (..), TransportError (..), TransportPeer (..), supportedParameters)
+import Simplex.Messaging.Transport (ALPN, HandshakeError (..), THandleAuth (..), THandleParams (..), TransportError (..), TransportPeer (..), defaultSupportedParams)
 import Simplex.Messaging.Transport.Client (TransportClientConfig, TransportHost, alpn)
 import Simplex.Messaging.Transport.HTTP2
 import Simplex.Messaging.Transport.HTTP2.Client
@@ -97,21 +102,21 @@ defaultXFTPClientConfig =
       clientALPN = Just supportedXFTPhandshakes
     }
 
-getXFTPClient :: TransportSession FileResponse -> XFTPClientConfig -> (XFTPClient -> IO ()) -> IO (Either XFTPClientError XFTPClient)
-getXFTPClient transportSession@(_, srv, _) config@XFTPClientConfig {clientALPN, xftpNetworkConfig, serverVRange} disconnected = runExceptT $ do
-  let username = proxyUsername transportSession
+getXFTPClient :: TransportSession FileResponse -> XFTPClientConfig -> UTCTime -> (XFTPClient -> IO ()) -> IO (Either XFTPClientError XFTPClient)
+getXFTPClient transportSession@(_, srv, _) config@XFTPClientConfig {clientALPN, xftpNetworkConfig, serverVRange} proxySessTs disconnected = runExceptT $ do
+  let socksCreds = clientSocksCredentials xftpNetworkConfig proxySessTs transportSession
       ProtocolServer _ host port keyHash = srv
   useHost <- liftEither $ chooseTransportHost xftpNetworkConfig host
-  let tcConfig = (transportClientConfig xftpNetworkConfig useHost) {alpn = clientALPN}
+  let tcConfig = (transportClientConfig xftpNetworkConfig useHost False) {alpn = clientALPN}
       http2Config = xftpHTTP2Config tcConfig config
   clientVar <- newTVarIO Nothing
   let usePort = if null port then "443" else port
       clientDisconnected = readTVarIO clientVar >>= mapM_ disconnected
-  http2Client <- liftError' xftpClientError $ getVerifiedHTTP2Client (Just username) useHost usePort (Just keyHash) Nothing http2Config clientDisconnected
+  http2Client <- liftError' xftpClientError $ getVerifiedHTTP2Client socksCreds useHost usePort (Just keyHash) Nothing http2Config clientDisconnected
   let HTTP2Client {sessionId, sessionALPN} = http2Client
       v = VersionXFTP 1
       thServerVRange = versionToRange v
-      thParams0 = THandleParams {sessionId, blockSize = xftpBlockSize, thVersion = v, thServerVRange, thAuth = Nothing, implySessId = False, batch = True}
+      thParams0 = THandleParams {sessionId, blockSize = xftpBlockSize, thVersion = v, thServerVRange, thAuth = Nothing, implySessId = False, encryptBlock = Nothing, batch = True}
   logDebug $ "Client negotiated handshake protocol: " <> tshow sessionALPN
   thParams@THandleParams {thVersion} <- case sessionALPN of
     Just "xftp/1" -> xftpClientHandshakeV1 serverVRange keyHash http2Client thParams0
@@ -171,7 +176,7 @@ xftpHTTP2Config :: TransportClientConfig -> XFTPClientConfig -> HTTP2ClientConfi
 xftpHTTP2Config transportConfig XFTPClientConfig {xftpNetworkConfig = NetworkConfig {tcpConnectTimeout}} =
   defaultHTTP2ClientConfig
     { bodyHeadSize = xftpBlockSize,
-      suportedTLSParams = supportedParameters,
+      suportedTLSParams = defaultSupportedParams,
       connTimeout = tcpConnectTimeout,
       transportConfig
     }
@@ -222,7 +227,7 @@ createXFTPChunk ::
   Maybe BasicAuth ->
   ExceptT XFTPClientError IO (SenderId, NonEmpty RecipientId)
 createXFTPChunk c spKey file rcps auth_ =
-  sendXFTPCommand c spKey "" (FNEW file rcps auth_) Nothing >>= \case
+  sendXFTPCommand c spKey NoEntity (FNEW file rcps auth_) Nothing >>= \case
     (FRSndIds sId rIds, body) -> noFile body (sId, rIds)
     (r, _) -> throwE $ unexpectedResponse r
 
@@ -278,7 +283,7 @@ pingXFTP :: XFTPClient -> ExceptT XFTPClientError IO ()
 pingXFTP c@XFTPClient {thParams} = do
   t <-
     liftEither . first PCETransportError $
-      xftpEncodeTransmission thParams ("", "", FileCmd SFRecipient PING)
+      xftpEncodeTransmission thParams ("", NoEntity, FileCmd SFRecipient PING)
   (r, _) <- sendXFTPTransmission c t Nothing
   case r of
     FRPong -> pure ()
@@ -297,3 +302,41 @@ noFile HTTP2Body {bodyPart} a = case bodyPart of
 
 -- FACK :: FileCommand Recipient
 -- PING :: FileCommand Recipient
+
+singleChunkSize :: Int64 -> Maybe Word32
+singleChunkSize size' =
+  listToMaybe $ dropWhile (< chunkSize) serverChunkSizes
+  where
+    chunkSize = fromIntegral size'
+
+prepareChunkSizes :: Int64 -> [Word32]
+prepareChunkSizes size' = prepareSizes size'
+  where
+    (smallSize, bigSize)
+      | size' > size34 chunkSize3 = (chunkSize2, chunkSize3)
+      | size' > size34 chunkSize2 = (chunkSize1, chunkSize2)
+      | otherwise = (chunkSize0, chunkSize1)
+    size34 sz = (fromIntegral sz * 3) `div` 4
+    prepareSizes 0 = []
+    prepareSizes size
+      | size >= fromIntegral bigSize = replicate (fromIntegral n1) bigSize <> prepareSizes remSz
+      | size > size34 bigSize = [bigSize]
+      | otherwise = replicate (fromIntegral n2') smallSize
+      where
+        (n1, remSz) = size `divMod` fromIntegral bigSize
+        n2' = let (n2, remSz2) = (size `divMod` fromIntegral smallSize) in if remSz2 == 0 then n2 else n2 + 1
+
+prepareChunkSpecs :: FilePath -> [Word32] -> [XFTPChunkSpec]
+prepareChunkSpecs filePath chunkSizes = reverse . snd $ foldl' addSpec (0, []) chunkSizes
+  where
+    addSpec :: (Int64, [XFTPChunkSpec]) -> Word32 -> (Int64, [XFTPChunkSpec])
+    addSpec (chunkOffset, specs) sz =
+      let spec = XFTPChunkSpec {filePath, chunkOffset, chunkSize = sz}
+       in (chunkOffset + fromIntegral sz, spec : specs)
+
+getChunkDigest :: XFTPChunkSpec -> IO ByteString
+getChunkDigest XFTPChunkSpec {filePath = chunkPath, chunkOffset, chunkSize} =
+  withFile chunkPath ReadMode $ \h -> do
+    hSeek h AbsoluteSeek $ fromIntegral chunkOffset
+    chunk <- LB.hGet h (fromIntegral chunkSize)
+    pure $! LC.sha256Hash chunk

src/Simplex/FileTransfer/Client/Agent.hs

@@ -16,6 +16,7 @@ import Data.Bifunctor (first)
 import qualified Data.ByteString.Char8 as B
 import Data.Text (Text)
 import Data.Text.Encoding (decodeUtf8)
+import Data.Time.Clock (UTCTime, getCurrentTime)
 import Simplex.FileTransfer.Client
 import Simplex.Messaging.Agent.RetryInterval
 import Simplex.Messaging.Client (NetworkConfig (..), ProtocolClientError (..), temporaryClientError)
@@ -30,6 +31,7 @@ type XFTPClientVar = TMVar (Either XFTPClientAgentError XFTPClient)
 
 data XFTPClientAgent = XFTPClientAgent
   { xftpClients :: TMap XFTPServer XFTPClientVar,
+    startedAt :: UTCTime,
     config :: XFTPClientAgentConfig
   }
 
@@ -56,19 +58,20 @@ data XFTPClientAgentError = XFTPClientAgentError XFTPServer XFTPClientError
 newXFTPAgent :: XFTPClientAgentConfig -> IO XFTPClientAgent
 newXFTPAgent config = do
   xftpClients <- TM.emptyIO
-  pure XFTPClientAgent {xftpClients, config}
+  startedAt <- getCurrentTime
+  pure XFTPClientAgent {xftpClients, startedAt, config}
 
 type ME a = ExceptT XFTPClientAgentError IO a
 
 getXFTPServerClient :: XFTPClientAgent -> XFTPServer -> ME XFTPClient
-getXFTPServerClient XFTPClientAgent {xftpClients, config} srv = do
+getXFTPServerClient XFTPClientAgent {xftpClients, startedAt, config} srv = do
   atomically getClientVar >>= either newXFTPClient waitForXFTPClient
   where
     connectClient :: ME XFTPClient
     connectClient =
       ExceptT $
         first (XFTPClientAgentError srv)
-          <$> getXFTPClient (1, srv, Nothing) (xftpConfig config) clientDisconnected
+          <$> getXFTPClient (1, srv, Nothing) (xftpConfig config) startedAt clientDisconnected
 
     clientDisconnected :: XFTPClient -> IO ()
     clientDisconnected _ = do

src/Simplex/FileTransfer/Client/Main.hs

@@ -19,11 +19,7 @@ module Simplex.FileTransfer.Client.Main
     singleChunkSize,
     prepareChunkSizes,
     prepareChunkSpecs,
-    maxFileSize,
-    maxFileSizeHard,
-    fileSizeLen,
     getChunkDigest,
-    SentRecipientReplica (..),
   )
 where
 
@@ -34,7 +30,6 @@ import Control.Monad.Trans.Except
 import Crypto.Random (ChaChaDRG)
 import qualified Data.Attoparsec.ByteString.Char8 as A
 import Data.Bifunctor (first)
-import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
 import qualified Data.ByteString.Lazy.Char8 as LB
 import Data.Char (toLower)
@@ -44,8 +39,8 @@ import Data.List (foldl', sortOn)
 import Data.List.NonEmpty (NonEmpty (..), nonEmpty)
 import qualified Data.List.NonEmpty as L
 import Data.Map.Strict (Map)
-import qualified Data.Map as M
-import Data.Maybe (fromMaybe, listToMaybe)
+import qualified Data.Map.Strict as M
+import Data.Maybe (fromMaybe)
 import qualified Data.Text as T
 import Data.Word (Word32)
 import GHC.Records (HasField (getField))
@@ -80,20 +75,6 @@ import UnliftIO.Directory
 xftpClientVersion :: String
 xftpClientVersion = "1.0.1"
 
--- | Soft limit for XFTP clients. Should be checked and reported to user.
-maxFileSize :: Int64
-maxFileSize = gb 1
-
-maxFileSizeStr :: String
-maxFileSizeStr = B.unpack . strEncode $ FileSize maxFileSize
-
--- | Hard internal limit for XFTP agent after which it refuses to prepare chunks.
-maxFileSizeHard :: Int64
-maxFileSizeHard = gb 5
-
-fileSizeLen :: Int64
-fileSizeLen = 8
-
 newtype CLIError = CLIError String
   deriving (Eq, Show, Exception)
 
@@ -231,16 +212,6 @@ data SentFileChunkReplica = SentFileChunkReplica
   }
   deriving (Show)
 
-data SentRecipientReplica = SentRecipientReplica
-  { chunkNo :: Int,
-    server :: XFTPServer,
-    rcvNo :: Int,
-    replicaId :: ChunkReplicaId,
-    replicaKey :: C.APrivateAuthKey,
-    digest :: FileDigest,
-    chunkSize :: FileSize Word32
-  }
-
 logCfg :: LogConfig
 logCfg = LogConfig {lc_file = Nothing, lc_stderr = True}
 
@@ -414,13 +385,6 @@ cliSendFileOpts SendOptions {filePath, outputDir, numRecipients, xftpServers, re
       B.writeFile fdSndPath $ strEncode fdSnd
       pure (fdRcvPaths, fdSndPath)
 
-getChunkDigest :: XFTPChunkSpec -> IO ByteString
-getChunkDigest XFTPChunkSpec {filePath = chunkPath, chunkOffset, chunkSize} =
-  withFile chunkPath ReadMode $ \h -> do
-    hSeek h AbsoluteSeek $ fromIntegral chunkOffset
-    chunk <- LB.hGet h (fromIntegral chunkSize)
-    pure $! LC.sha256Hash chunk
-
 cliReceiveFile :: ReceiveOptions -> ExceptT CLIError IO ()
 cliReceiveFile ReceiveOptions {fileDescription, filePath, retryCount, tempPath, verbose, yes} =
   getFileDescription' fileDescription >>= receive
@@ -536,37 +500,6 @@ getFileDescription' path =
   getFileDescription path >>= \case
     AVFD fd -> either (throwE . CLIError) pure $ checkParty fd
 
-singleChunkSize :: Int64 -> Maybe Word32
-singleChunkSize size' =
-  listToMaybe $ dropWhile (< chunkSize) serverChunkSizes
-  where
-    chunkSize = fromIntegral size'
-
-prepareChunkSizes :: Int64 -> [Word32]
-prepareChunkSizes size' = prepareSizes size'
-  where
-    (smallSize, bigSize)
-      | size' > size34 chunkSize3 = (chunkSize2, chunkSize3)
-      | size' > size34 chunkSize2 = (chunkSize1, chunkSize2)
-      | otherwise = (chunkSize0, chunkSize1)
-    size34 sz = (fromIntegral sz * 3) `div` 4
-    prepareSizes 0 = []
-    prepareSizes size
-      | size >= fromIntegral bigSize = replicate (fromIntegral n1) bigSize <> prepareSizes remSz
-      | size > size34 bigSize = [bigSize]
-      | otherwise = replicate (fromIntegral n2') smallSize
-      where
-        (n1, remSz) = size `divMod` fromIntegral bigSize
-        n2' = let (n2, remSz2) = (size `divMod` fromIntegral smallSize) in if remSz2 == 0 then n2 else n2 + 1
-
-prepareChunkSpecs :: FilePath -> [Word32] -> [XFTPChunkSpec]
-prepareChunkSpecs filePath chunkSizes = reverse . snd $ foldl' addSpec (0, []) chunkSizes
-  where
-    addSpec :: (Int64, [XFTPChunkSpec]) -> Word32 -> (Int64, [XFTPChunkSpec])
-    addSpec (chunkOffset, specs) sz =
-      let spec = XFTPChunkSpec {filePath, chunkOffset, chunkSize = sz}
-       in (chunkOffset + fromIntegral sz, spec : specs)
-
 getEncPath :: MonadIO m => Maybe FilePath -> String -> m FilePath
 getEncPath path name = (`uniqueCombine` (name <> ".encrypted")) =<< maybe (liftIO getCanonicalTemporaryDirectory) pure path
 

src/Simplex/FileTransfer/Description.hs

@@ -1,12 +1,15 @@
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE DeriveAnyClass #-}
+{-# LANGUAGE DerivingStrategies #-}
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE GADTs #-}
+{-# LANGUAGE GeneralizedNewtypeDeriving #-}
 {-# LANGUAGE KindSignatures #-}
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE PatternSynonyms #-}
 {-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE StandaloneDeriving #-}
 {-# LANGUAGE TemplateHaskell #-}
 {-# OPTIONS_GHC -fno-warn-ambiguous-fields #-}
 
@@ -35,6 +38,10 @@ module Simplex.FileTransfer.Description
     FileClientData,
     fileDescriptionURI,
     qrSizeLimit,
+    maxFileSize,
+    maxFileSizeStr,
+    maxFileSizeHard,
+    fileSizeLen,
   )
 where
 
@@ -53,18 +60,17 @@ import Data.List (foldl', sortOn)
 import Data.List.NonEmpty (NonEmpty (..))
 import qualified Data.List.NonEmpty as L
 import Data.Map.Strict (Map)
-import qualified Data.Map as M
+import qualified Data.Map.Strict as M
 import Data.Maybe (fromMaybe)
 import Data.String
 import Data.Text (Text)
 import Data.Text.Encoding (encodeUtf8)
 import Data.Word (Word32)
 import qualified Data.Yaml as Y
-import Database.SQLite.Simple.FromField (FromField (..))
-import Database.SQLite.Simple.ToField (ToField (..))
 import Simplex.FileTransfer.Chunks
 import Simplex.FileTransfer.Protocol
 import Simplex.Messaging.Agent.QueryString
+import Simplex.Messaging.Agent.Store.DB (Binary (..), FromField (..), ToField (..))
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Parsers (defaultJSON, parseAll)
@@ -107,6 +113,9 @@ fdSeparator = "################################\n"
 
 newtype FileDigest = FileDigest {unFileDigest :: ByteString}
   deriving (Eq, Show)
+  deriving newtype (FromField)
+
+instance ToField FileDigest where toField (FileDigest s) = toField $ Binary s
 
 instance StrEncoding FileDigest where
   strEncode (FileDigest fd) = strEncode fd
@@ -120,10 +129,6 @@ instance ToJSON FileDigest where
   toJSON = strToJSON
   toEncoding = strToJEncoding
 
-instance FromField FileDigest where fromField f = FileDigest <$> fromField f
-
-instance ToField FileDigest where toField (FileDigest s) = toField s
-
 data FileChunk = FileChunk
   { chunkNo :: Int,
     chunkSize :: FileSize Word32,
@@ -139,12 +144,9 @@ data FileChunkReplica = FileChunkReplica
   }
   deriving (Eq, Show)
 
-newtype ChunkReplicaId = ChunkReplicaId {unChunkReplicaId :: ByteString}
+newtype ChunkReplicaId = ChunkReplicaId {unChunkReplicaId :: XFTPFileId}
   deriving (Eq, Show)
-
-instance StrEncoding ChunkReplicaId where
-  strEncode (ChunkReplicaId fid) = strEncode fid
-  strP = ChunkReplicaId <$> strP
+  deriving newtype (StrEncoding)
 
 instance FromJSON ChunkReplicaId where
   parseJSON = strParseJSON "ChunkReplicaId"
@@ -153,10 +155,6 @@ instance ToJSON ChunkReplicaId where
   toJSON = strToJSON
   toEncoding = strToJEncoding
 
-instance FromField ChunkReplicaId where fromField f = ChunkReplicaId <$> fromField f
-
-instance ToField ChunkReplicaId where toField (ChunkReplicaId s) = toField s
-
 data YAMLFileDescription = YAMLFileDescription
   { party :: FileParty,
     size :: String,
@@ -271,6 +269,21 @@ instance StrEncoding FileDescriptionURI where
 qrSizeLimit :: Int
 qrSizeLimit = 1002 -- ~2 chunks in URLencoded YAML with some spare size for server hosts
 
+-- | Soft limit for XFTP clients. Should be checked and reported to user.
+maxFileSize :: Int64
+maxFileSize = gb 1
+
+maxFileSizeStr :: String
+maxFileSizeStr = B.unpack . strEncode $ FileSize maxFileSize
+
+-- | Hard internal limit for XFTP agent after which it refuses to prepare chunks.
+maxFileSizeHard :: Int64
+maxFileSizeHard = gb 5
+
+fileSizeLen :: Int64
+fileSizeLen = 8
+
+
 instance (Integral a, Show a) => StrEncoding (FileSize a) where
   strEncode (FileSize b)
     | b' /= 0 = bshow b
@@ -293,9 +306,9 @@ instance (Integral a, Show a) => StrEncoding (FileSize a) where
 instance (Integral a, Show a) => IsString (FileSize a) where
   fromString = either error id . strDecode . B.pack
 
-instance FromField a => FromField (FileSize a) where fromField f = FileSize <$> fromField f
+deriving newtype instance FromField a => FromField (FileSize a)
 
-instance ToField a => ToField (FileSize a) where toField (FileSize s) = toField s
+deriving newtype instance ToField a => ToField (FileSize a)
 
 groupReplicasByServer :: FileSize Word32 -> [FileChunk] -> [NonEmpty FileServerReplica]
 groupReplicasByServer defChunkSize =

src/Simplex/FileTransfer/Protocol.hs

@@ -25,7 +25,7 @@ import Data.List.NonEmpty (NonEmpty (..))
 import Data.Maybe (isNothing)
 import Data.Type.Equality
 import Data.Word (Word32)
-import Simplex.FileTransfer.Transport (XFTPErrorType (..), XFTPVersion, xftpClientHandshakeStub)
+import Simplex.FileTransfer.Transport (XFTPErrorType (..), XFTPVersion, blockedFilesXFTPVersion, xftpClientHandshakeStub)
 import Simplex.Messaging.Client (authTransmission)
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Encoding
@@ -41,6 +41,7 @@ import Simplex.Messaging.Protocol
     ProtocolType (..),
     RcvPublicAuthKey,
     RcvPublicDhKey,
+    EntityId (..),
     RecipientId,
     SenderId,
     SentRawTransmission,
@@ -170,7 +171,7 @@ data FileInfo = FileInfo
   }
   deriving (Show)
 
-type XFTPFileId = ByteString
+type XFTPFileId = EntityId
 
 instance FilePartyI p => ProtocolEncoding XFTPVersion XFTPErrorType (FileCommand p) where
   type Tag (FileCommand p) = FileCommandTag p
@@ -191,7 +192,7 @@ instance FilePartyI p => ProtocolEncoding XFTPVersion XFTPErrorType (FileCommand
   fromProtocolError = fromProtocolError @XFTPVersion @XFTPErrorType @FileResponse
   {-# INLINE fromProtocolError #-}
 
-  checkCredentials (auth, _, fileId, _) cmd = case cmd of
+  checkCredentials (auth, _, EntityId fileId, _) cmd = case cmd of
     -- FNEW must not have signature and chunk ID
     FNEW {}
       | isNothing auth -> Left $ CMD NO_AUTH
@@ -275,12 +276,14 @@ data FileResponse
 
 instance ProtocolEncoding XFTPVersion XFTPErrorType FileResponse where
   type Tag FileResponse = FileResponseTag
-  encodeProtocol _v = \case
+  encodeProtocol v = \case
     FRSndIds fId rIds -> e (FRSndIds_, ' ', fId, rIds)
     FRRcvIds rIds -> e (FRRcvIds_, ' ', rIds)
     FRFile rDhKey nonce -> e (FRFile_, ' ', rDhKey, nonce)
     FROk -> e FROk_
-    FRErr err -> e (FRErr_, ' ', err)
+    FRErr err -> case err of
+      BLOCKED _ | v < blockedFilesXFTPVersion -> e (FRErr_, ' ', AUTH)
+      _ -> e (FRErr_, ' ', err)
     FRPong -> e FRPong_
     where
       e :: Encoding a => a -> ByteString
@@ -301,7 +304,7 @@ instance ProtocolEncoding XFTPVersion XFTPErrorType FileResponse where
     PEBlock -> BLOCK
   {-# INLINE fromProtocolError #-}
 
-  checkCredentials (_, _, entId, _) cmd = case cmd of
+  checkCredentials (_, _, EntityId entId, _) cmd = case cmd of
     FRSndIds {} -> noEntity
     -- ERR response does not always have entity ID
     FRErr _ -> Right cmd

src/Simplex/FileTransfer/Server.hs

@@ -9,6 +9,7 @@
 {-# LANGUAGE NumericUnderscores #-}
 {-# LANGUAGE OverloadedLists #-}
 {-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE PatternSynonyms #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TupleSections #-}
 
@@ -32,11 +33,11 @@ import qualified Data.Map.Strict as M
 import Data.Maybe (fromMaybe, isJust)
 import qualified Data.Text as T
 import Data.Time.Clock (UTCTime (..), diffTimeToPicoseconds, getCurrentTime)
-import Data.Time.Clock.System (SystemTime (..), getSystemTime)
 import Data.Time.Format.ISO8601 (iso8601Show)
 import Data.Word (Word32)
 import qualified Data.X509 as X
 import GHC.IO.Handle (hSetNewlineMode)
+import GHC.IORef (atomicSwapIORef)
 import GHC.Stats (getRTSStats)
 import qualified Network.HTTP.Types as N
 import qualified Network.HTTP2.Server as H
@@ -52,18 +53,20 @@ import qualified Simplex.Messaging.Crypto as C
 import qualified Simplex.Messaging.Crypto.Lazy as LC
 import Simplex.Messaging.Encoding
 import Simplex.Messaging.Encoding.String
-import Simplex.Messaging.Protocol (CorrId (..), RcvPublicAuthKey, RcvPublicDhKey, RecipientId, TransmissionAuth)
+import Simplex.Messaging.Protocol (CorrId (..), BlockingInfo, EntityId (..), RcvPublicAuthKey, RcvPublicDhKey, RecipientId, TransmissionAuth, pattern NoEntity)
 import Simplex.Messaging.Server (dummyVerifyCmd, verifyCmdAuthorization)
+import Simplex.Messaging.Server.Control (CPClientRole (..))
 import Simplex.Messaging.Server.Expiration
+import Simplex.Messaging.Server.QueueStore (RoundedSystemTime, ServerEntityStatus (..), getRoundedSystemTime)
 import Simplex.Messaging.Server.Stats
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
-import Simplex.Messaging.Transport (SessionId, THandleAuth (..), THandleParams (..), TransportPeer (..))
+import Simplex.Messaging.Transport (ALPN, SessionId, THandleAuth (..), THandleParams (..), TransportPeer (..), defaultSupportedParams)
 import Simplex.Messaging.Transport.Buffer (trimCR)
 import Simplex.Messaging.Transport.HTTP2
 import Simplex.Messaging.Transport.HTTP2.File (fileBlockSize)
 import Simplex.Messaging.Transport.HTTP2.Server
-import Simplex.Messaging.Transport.Server (runTCPServer, tlsServerCredentials)
+import Simplex.Messaging.Transport.Server (runLocalTCPServer)
 import Simplex.Messaging.Util
 import Simplex.Messaging.Version
 import System.Exit (exitFailure)
@@ -89,36 +92,35 @@ data XFTPTransportRequest = XFTPTransportRequest
 runXFTPServer :: XFTPServerConfig -> IO ()
 runXFTPServer cfg = do
   started <- newEmptyTMVarIO
-  runXFTPServerBlocking started cfg
+  runXFTPServerBlocking started cfg $ Just supportedXFTPhandshakes
 
-runXFTPServerBlocking :: TMVar Bool -> XFTPServerConfig -> IO ()
-runXFTPServerBlocking started cfg = newXFTPServerEnv cfg >>= runReaderT (xftpServer cfg started)
+runXFTPServerBlocking :: TMVar Bool -> XFTPServerConfig -> Maybe [ALPN] -> IO ()
+runXFTPServerBlocking started cfg alpn_ = newXFTPServerEnv cfg >>= runReaderT (xftpServer cfg started alpn_)
 
 data Handshake
   = HandshakeSent C.PrivateKeyX25519
   | HandshakeAccepted (THandleParams XFTPVersion 'TServer)
 
-xftpServer :: XFTPServerConfig -> TMVar Bool -> M ()
-xftpServer cfg@XFTPServerConfig {xftpPort, transportConfig, inactiveClientExpiration, fileExpiration, xftpServerVRange} started = do
+xftpServer :: XFTPServerConfig -> TMVar Bool -> Maybe [ALPN] -> M ()
+xftpServer cfg@XFTPServerConfig {xftpPort, transportConfig, inactiveClientExpiration, fileExpiration, xftpServerVRange} started alpn_ = do
   mapM_ (expireServerFiles Nothing) fileExpiration
   restoreServerStats
   raceAny_ (runServer : expireFilesThread_ cfg <> serverStatsThread_ cfg <> controlPortThread_ cfg) `finally` stopServer
   where
     runServer :: M ()
     runServer = do
-      serverParams <- asks tlsServerParams
-      let (chain, pk) = tlsServerCredentials serverParams
+      srvCreds@(chain, pk) <- asks tlsServerCreds
       signKey <- liftIO $ case C.x509ToPrivate (pk, []) >>= C.privKey of
         Right pk' -> pure pk'
         Left e -> putStrLn ("servers has no valid key: " <> show e) >> exitFailure
       env <- ask
       sessions <- liftIO TM.emptyIO
       let cleanup sessionId = atomically $ TM.delete sessionId sessions
-      liftIO . runHTTP2Server started xftpPort defaultHTTP2BufferSize serverParams transportConfig inactiveClientExpiration cleanup $ \sessionId sessionALPN r sendResponse -> do
+      liftIO . runHTTP2Server started xftpPort defaultHTTP2BufferSize defaultSupportedParams srvCreds alpn_ transportConfig inactiveClientExpiration cleanup $ \sessionId sessionALPN r sendResponse -> do
         reqBody <- getHTTP2Body r xftpBlockSize
         let v = VersionXFTP 1
             thServerVRange = versionToRange v
-            thParams0 = THandleParams {sessionId, blockSize = xftpBlockSize, thVersion = v, thServerVRange, thAuth = Nothing, implySessId = False, batch = True}
+            thParams0 = THandleParams {sessionId, blockSize = xftpBlockSize, thVersion = v, thServerVRange, thAuth = Nothing, implySessId = False, encryptBlock = Nothing, batch = True}
             req0 = XFTPTransportRequest {thParams = thParams0, request = r, reqBody, sendResponse}
         flip runReaderT env $ case sessionALPN of
           Nothing -> processRequest req0
@@ -179,6 +181,7 @@ xftpServer cfg@XFTPServerConfig {xftpPort, transportConfig, inactiveClientExpira
     stopServer = do
       withFileLog closeStoreLog
       saveServerStats
+      logInfo "Server stopped"
 
     expireFilesThread_ :: XFTPServerConfig -> [M ()]
     expireFilesThread_ XFTPServerConfig {fileExpiration = Just fileExp} = [expireFiles fileExp]
@@ -207,17 +210,17 @@ xftpServer cfg@XFTPServerConfig {xftpPort, transportConfig, inactiveClientExpira
         withFile statsFilePath AppendMode $ \h -> liftIO $ do
           hSetBuffering h LineBuffering
           ts <- getCurrentTime
-          fromTime' <- atomically $ swapTVar fromTime ts
-          filesCreated' <- atomically $ swapTVar filesCreated 0
-          fileRecipients' <- atomically $ swapTVar fileRecipients 0
-          filesUploaded' <- atomically $ swapTVar filesUploaded 0
-          filesExpired' <- atomically $ swapTVar filesExpired 0
-          filesDeleted' <- atomically $ swapTVar filesDeleted 0
-          files <- atomically $ periodStatCounts filesDownloaded ts
-          fileDownloads' <- atomically $ swapTVar fileDownloads 0
-          fileDownloadAcks' <- atomically $ swapTVar fileDownloadAcks 0
-          filesCount' <- readTVarIO filesCount
-          filesSize' <- readTVarIO filesSize
+          fromTime' <- atomicSwapIORef fromTime ts
+          filesCreated' <- atomicSwapIORef filesCreated 0
+          fileRecipients' <- atomicSwapIORef fileRecipients 0
+          filesUploaded' <- atomicSwapIORef filesUploaded 0
+          filesExpired' <- atomicSwapIORef filesExpired 0
+          filesDeleted' <- atomicSwapIORef filesDeleted 0
+          files <- liftIO $ periodStatCounts filesDownloaded ts
+          fileDownloads' <- atomicSwapIORef fileDownloads 0
+          fileDownloadAcks' <- atomicSwapIORef fileDownloadAcks 0
+          filesCount' <- readIORef filesCount
+          filesSize' <- readIORef filesSize
           hPutStrLn h $
             intercalate
               ","
@@ -247,7 +250,7 @@ xftpServer cfg@XFTPServerConfig {xftpPort, transportConfig, inactiveClientExpira
       u <- askUnliftIO
       liftIO $ do
         labelMyThread "control port server"
-        runTCPServer cpStarted port $ runCPClient u
+        runLocalTCPServer cpStarted port $ runCPClient u
       where
         runCPClient :: UnliftIO (ReaderT XFTPEnv IO) -> Socket -> IO ()
         runCPClient u sock = do
@@ -284,11 +287,15 @@ xftpServer cfg@XFTPServerConfig {xftpPort, transportConfig, inactiveClientExpira
               CPDelete fileId -> withUserRole $ unliftIO u $ do
                 fs <- asks store
                 r <- runExceptT $ do
-                  let asSender = ExceptT . atomically $ getFile fs SFSender fileId
-                  let asRecipient = ExceptT . atomically $ getFile fs SFRecipient fileId
-                  (fr, _) <- asSender `catchError` const asRecipient
+                  (fr, _) <- ExceptT $ atomically $ getFile fs SFRecipient fileId
                   ExceptT $ deleteServerFile_ fr
                 liftIO . hPutStrLn h $ either (\e -> "error: " <> show e) (\() -> "ok") r
+              CPBlock fileId info -> withUserRole $ unliftIO u $ do
+                fs <- asks store
+                r <- runExceptT $ do
+                  (fr, _) <- ExceptT $ atomically $ getFile fs SFRecipient fileId
+                  ExceptT $ blockServerFile fr info
+                liftIO . hPutStrLn h $ either (\e -> "error: " <> show e) (\() -> "ok") r
               CPHelp -> hPutStrLn h "commands: stats-rts, delete, help, quit"
               CPQuit -> pure ()
               CPSkip -> pure ()
@@ -309,7 +316,7 @@ data ServerFile = ServerFile
 
 processRequest :: XFTPTransportRequest -> M ()
 processRequest XFTPTransportRequest {thParams, reqBody = body@HTTP2Body {bodyHead}, sendResponse}
-  | B.length bodyHead /= xftpBlockSize = sendXFTPResponse ("", "", FRErr BLOCK) Nothing
+  | B.length bodyHead /= xftpBlockSize = sendXFTPResponse ("", NoEntity, FRErr BLOCK) Nothing
   | otherwise = do
       case xftpDecodeTransmission thParams bodyHead of
         Right (sig_, signed, (corrId, fId, cmdOrErr)) ->
@@ -318,11 +325,11 @@ processRequest XFTPTransportRequest {thParams, reqBody = body@HTTP2Body {bodyHea
               let THandleParams {thAuth} = thParams
               verifyXFTPTransmission ((,C.cbNonce (bs corrId)) <$> thAuth) sig_ signed fId cmd >>= \case
                 VRVerified req -> uncurry send =<< processXFTPRequest body req
-                VRFailed -> send (FRErr AUTH) Nothing
+                VRFailed e -> send (FRErr e) Nothing
             Left e -> send (FRErr e) Nothing
           where
             send resp = sendXFTPResponse (corrId, fId, resp)
-        Left e -> sendXFTPResponse ("", "", FRErr e) Nothing
+        Left e -> sendXFTPResponse ("", NoEntity, FRErr e) Nothing
   where
     sendXFTPResponse (corrId, fId, resp) serverFile_ = do
       let t_ = xftpEncodeTransmission thParams (corrId, fId, resp)
@@ -352,7 +359,7 @@ randomDelay = do
     threadDelay $ (d * (1000 + pc)) `div` 1000
 #endif
 
-data VerificationResult = VRVerified XFTPRequest | VRFailed
+data VerificationResult = VRVerified XFTPRequest | VRFailed XFTPErrorType
 
 verifyXFTPTransmission :: Maybe (THandleAuth 'TServer, C.CbNonce) -> Maybe TransmissionAuth -> ByteString -> XFTPFileId -> FileCmd -> M VerificationResult
 verifyXFTPTransmission auth_ tAuth authorized fId cmd =
@@ -364,13 +371,19 @@ verifyXFTPTransmission auth_ tAuth authorized fId cmd =
     verifyCmd :: SFileParty p -> M VerificationResult
     verifyCmd party = do
       st <- asks store
-      atomically $ verify <$> getFile st party fId
+      atomically $ verify =<< getFile st party fId
       where
         verify = \case
-          Right (fr, k) -> XFTPReqCmd fId fr cmd `verifyWith` k
-          _ -> maybe False (dummyVerifyCmd Nothing authorized) tAuth `seq` VRFailed
+          Right (fr, k) -> result <$> readTVar (fileStatus fr)
+            where
+              result = \case
+                EntityActive -> XFTPReqCmd fId fr cmd `verifyWith` k
+                EntityBlocked info -> VRFailed $ BLOCKED info
+                EntityOff -> noFileAuth
+          Left _ -> pure noFileAuth
+        noFileAuth = maybe False (dummyVerifyCmd Nothing authorized) tAuth `seq` VRFailed AUTH
     -- TODO verify with DH authorization
-    req `verifyWith` k = if verifyCmdAuthorization auth_ tAuth authorized k then VRVerified req else VRFailed
+    req `verifyWith` k = if verifyCmdAuthorization auth_ tAuth authorized k then VRVerified req else VRFailed AUTH
 
 processXFTPRequest :: HTTP2Body -> XFTPRequest -> M (FileResponse, Maybe ServerFile)
 processXFTPRequest HTTP2Body {bodyPart} = \case
@@ -387,7 +400,7 @@ processXFTPRequest HTTP2Body {bodyPart} = \case
     FACK -> noFile =<< ackFileReception fId fr
     -- it should never get to the commands below, they are passed in other constructors of XFTPRequest
     FNEW {} -> noFile $ FRErr INTERNAL
-    PING -> noFile FRPong
+    PING -> noFile $ FRErr INTERNAL
   XFTPReqPing -> noFile FRPong
   where
     noFile resp = pure (resp, Nothing)
@@ -397,7 +410,7 @@ processXFTPRequest HTTP2Body {bodyPart} = \case
       r <- runExceptT $ do
         sizes <- asks $ allowedChunkSizes . config
         unless (size file `elem` sizes) $ throwE SIZE
-        ts <- liftIO getSystemTime
+        ts <- liftIO getFileTime
         -- TODO validate body empty
         sId <- ExceptT $ addFileRetry st file 3 ts
         rcps <- mapM (ExceptT . addRecipientRetry st 3 sId) rks
@@ -405,12 +418,12 @@ processXFTPRequest HTTP2Body {bodyPart} = \case
           logAddFile sl sId file ts
           logAddRecipients sl sId rcps
         stats <- asks serverStats
-        atomically $ modifyTVar' (filesCreated stats) (+ 1)
-        atomically $ modifyTVar' (fileRecipients stats) (+ length rks)
+        lift $ incFileStat filesCreated
+        liftIO $ atomicModifyIORef'_ (fileRecipients stats) (+ length rks)
         let rIds = L.map (\(FileRecipient rId _) -> rId) rcps
         pure $ FRSndIds sId rIds
       pure $ either FRErr id r
-    addFileRetry :: FileStore -> FileInfo -> Int -> SystemTime -> M (Either XFTPErrorType XFTPFileId)
+    addFileRetry :: FileStore -> FileInfo -> Int -> RoundedSystemTime -> M (Either XFTPErrorType XFTPFileId)
     addFileRetry st file n ts =
       retryAdd n $ \sId -> runExceptT $ do
         ExceptT $ addFile st sId file ts
@@ -435,7 +448,7 @@ processXFTPRequest HTTP2Body {bodyPart} = \case
         rcps <- mapM (ExceptT . addRecipientRetry st 3 sId) rks
         lift $ withFileLog $ \sl -> logAddRecipients sl sId rcps
         stats <- asks serverStats
-        atomically $ modifyTVar' (fileRecipients stats) (+ length rks)
+        liftIO $ atomicModifyIORef'_ (fileRecipients stats) (+ length rks)
         let rIds = L.map (\(FileRecipient rId _) -> rId) rcps
         pure $ FRRcvIds rIds
       pure $ either FRErr id r
@@ -463,19 +476,19 @@ processXFTPRequest HTTP2Body {bodyPart} = \case
               \used -> let used' = used + fromIntegral size in if used' <= quota then (True, used') else (False, used)
           receive = do
             path <- asks $ filesPath . config
-            let fPath = path </> B.unpack (B64.encode senderId)
+            let fPath = path </> B.unpack (B64.encode $ unEntityId senderId)
             receiveChunk (XFTPRcvChunkSpec fPath size digest) >>= \case
               Right () -> do
                 stats <- asks serverStats
                 withFileLog $ \sl -> logPutFile sl senderId fPath
                 atomically $ writeTVar filePath (Just fPath)
-                atomically $ modifyTVar' (filesUploaded stats) (+ 1)
-                atomically $ modifyTVar' (filesCount stats) (+ 1)
-                atomically $ modifyTVar' (filesSize stats) (+ fromIntegral size)
+                incFileStat filesUploaded
+                incFileStat filesCount
+                liftIO $ atomicModifyIORef'_ (filesSize stats) (+ fromIntegral size)
                 pure FROk
               Left e -> do
                 us <- asks $ usedStorage . store
-                atomically . modifyTVar' us $ subtract (fromIntegral size)
+                atomically $ modifyTVar' us $ subtract (fromIntegral size)
                 liftIO $ whenM (doesFileExist fPath) (removeFile fPath) `catch` logFileError
                 pure $ FRErr e
           receiveChunk spec = do
@@ -494,8 +507,8 @@ processXFTPRequest HTTP2Body {bodyPart} = \case
               case LC.cbInit dhSecret cbNonce of
                 Right sbState -> do
                   stats <- asks serverStats
-                  atomically $ modifyTVar' (fileDownloads stats) (+ 1)
-                  atomically $ updatePeriodStats (filesDownloaded stats) senderId
+                  incFileStat fileDownloads
+                  liftIO $ updatePeriodStats (filesDownloaded stats) senderId
                   pure (FRFile sDhKey cbNonce, Just ServerFile {filePath = path, fileSize = size, sbState})
                 _ -> pure (FRErr INTERNAL, Nothing)
         _ -> pure (FRErr NO_FILE, Nothing)
@@ -511,24 +524,35 @@ processXFTPRequest HTTP2Body {bodyPart} = \case
       withFileLog (`logAckFile` rId)
       st <- asks store
       atomically $ deleteRecipient st rId fr
-      stats <- asks serverStats
-      atomically $ modifyTVar' (fileDownloadAcks stats) (+ 1)
+      incFileStat fileDownloadAcks
       pure FROk
 
 deleteServerFile_ :: FileRec -> M (Either XFTPErrorType ())
-deleteServerFile_ FileRec {senderId, fileInfo, filePath} = do
+deleteServerFile_ fr@FileRec {senderId} = do
   withFileLog (`logDeleteFile` senderId)
-  runExceptT $ do
-    path <- readTVarIO filePath
-    stats <- asks serverStats
-    ExceptT $ first (\(_ :: SomeException) -> FILE_IO) <$> try (forM_ path $ \p -> whenM (doesFileExist p) (removeFile p >> deletedStats stats))
-    st <- asks store
-    void $ atomically $ deleteFile st senderId
-    atomically $ modifyTVar' (filesDeleted stats) (+ 1)
+  deleteOrBlockServerFile_ fr filesDeleted (`deleteFile` senderId)
+
+-- this also deletes the file from storage, but doesn't include it in delete statistics
+blockServerFile :: FileRec -> BlockingInfo -> M (Either XFTPErrorType ())
+blockServerFile fr@FileRec {senderId} info = do
+  withFileLog $ \sl -> logBlockFile sl senderId info
+  deleteOrBlockServerFile_ fr filesBlocked $ \st -> blockFile st senderId info True
+
+deleteOrBlockServerFile_ :: FileRec -> (FileServerStats -> IORef Int) -> (FileStore -> STM (Either XFTPErrorType ())) -> M (Either XFTPErrorType ())
+deleteOrBlockServerFile_ FileRec {filePath, fileInfo} stat storeAction = runExceptT $ do
+  path <- readTVarIO filePath
+  stats <- asks serverStats
+  ExceptT $ first (\(_ :: SomeException) -> FILE_IO) <$> try (forM_ path $ \p -> whenM (doesFileExist p) (removeFile p >> deletedStats stats))
+  st <- asks store
+  void $ atomically $ storeAction st
+  lift $ incFileStat stat
   where
     deletedStats stats = do
-      atomically $ modifyTVar' (filesCount stats) (subtract 1)
-      atomically $ modifyTVar' (filesSize stats) (subtract $ fromIntegral $ size fileInfo)
+      liftIO $ atomicModifyIORef'_ (filesCount stats) (subtract 1)
+      liftIO $ atomicModifyIORef'_ (filesSize stats) (subtract $ fromIntegral $ size fileInfo)
+
+getFileTime :: IO RoundedSystemTime
+getFileTime = getRoundedSystemTime fileTimePrecision
 
 expireServerFiles :: Maybe Int -> ExpirationConfig -> M ()
 expireServerFiles itemDelay expCfg = do
@@ -554,24 +578,21 @@ expireServerFiles itemDelay expCfg = do
     delete st sId = do
       withFileLog (`logDeleteFile` sId)
       void . atomically $ deleteFile st sId -- will not update usedStorage if sId isn't in store
-      FileServerStats {filesExpired} <- asks serverStats
-      atomically $ modifyTVar' filesExpired (+ 1)
+      incFileStat filesExpired
 
 randomId :: Int -> M ByteString
 randomId n = atomically . C.randomBytes n =<< asks random
 
 getFileId :: M XFTPFileId
-getFileId = do
-  size <- asks (fileIdSize . config)
-  atomically . C.randomBytes size =<< asks random
+getFileId = fmap EntityId . randomId =<< asks (fileIdSize . config)
 
 withFileLog :: (StoreLog 'WriteMode -> IO a) -> M ()
 withFileLog action = liftIO . mapM_ action =<< asks storeLog
 
-incFileStat :: (FileServerStats -> TVar Int) -> M ()
+incFileStat :: (FileServerStats -> IORef Int) -> M ()
 incFileStat statSel = do
   stats <- asks serverStats
-  atomically $ modifyTVar (statSel stats) (+ 1)
+  liftIO $ atomicModifyIORef'_ (statSel stats) (+ 1)
 
 saveServerStats :: M ()
 saveServerStats =
@@ -594,7 +615,7 @@ restoreServerStats = asks (serverStatsBackupFile . config) >>= mapM_ restoreStat
           FileStore {files, usedStorage} <- asks store
           _filesCount <- M.size <$> readTVarIO files
           _filesSize <- readTVarIO usedStorage
-          atomically $ setFileServerStats s d {_filesCount, _filesSize}
+          liftIO $ setFileServerStats s d {_filesCount, _filesSize}
           renameFile f $ f <> ".bak"
           logInfo "server stats restored"
           when (statsFilesCount /= _filesCount) $ logWarn $ "Files count differs: stats: " <> tshow statsFilesCount <> ", store: " <> tshow _filesCount

src/Simplex/FileTransfer/Server/Control.hs

@@ -4,16 +4,15 @@
 module Simplex.FileTransfer.Server.Control where
 
 import qualified Data.Attoparsec.ByteString.Char8 as A
-import Data.ByteString (ByteString)
+import Simplex.FileTransfer.Protocol (XFTPFileId)
 import Simplex.Messaging.Encoding.String
-import Simplex.Messaging.Protocol (BasicAuth)
-
-data CPClientRole = CPRNone | CPRUser | CPRAdmin
+import Simplex.Messaging.Protocol (BasicAuth, BlockingInfo)
 
 data ControlProtocol
   = CPAuth BasicAuth
   | CPStatsRTS
-  | CPDelete ByteString
+  | CPDelete XFTPFileId
+  | CPBlock XFTPFileId BlockingInfo
   | CPHelp
   | CPQuit
   | CPSkip
@@ -23,6 +22,7 @@ instance StrEncoding ControlProtocol where
     CPAuth tok -> "auth " <> strEncode tok
     CPStatsRTS -> "stats-rts"
     CPDelete fId -> strEncode (Str "delete", fId)
+    CPBlock fId info -> strEncode (Str "block", fId, info)
     CPHelp -> "help"
     CPQuit -> "quit"
     CPSkip -> ""
@@ -31,6 +31,7 @@ instance StrEncoding ControlProtocol where
       "auth" -> CPAuth <$> _strP
       "stats-rts" -> pure CPStatsRTS
       "delete" -> CPDelete <$> _strP
+      "block" -> CPBlock <$> _strP <*> _strP
       "help" -> pure CPHelp
       "quit" -> pure CPQuit
       "" -> pure CPSkip

src/Simplex/FileTransfer/Server/Env.hs

@@ -28,8 +28,7 @@ import Simplex.FileTransfer.Transport (VersionRangeXFTP)
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Protocol (BasicAuth, RcvPublicAuthKey)
 import Simplex.Messaging.Server.Expiration
-import Simplex.Messaging.Transport (ALPN)
-import Simplex.Messaging.Transport.Server (TransportServerConfig (..), loadFingerprint, loadTLSServerParams)
+import Simplex.Messaging.Transport.Server (ServerCredentials (..), TransportServerConfig (..), loadFingerprint, loadServerCredential)
 import Simplex.Messaging.Util (tshow)
 import System.IO (IOMode (..))
 import UnliftIO.STM
@@ -57,10 +56,7 @@ data XFTPServerConfig = XFTPServerConfig
     fileTimeout :: Int,
     -- | time after which inactive clients can be disconnected and check interval, seconds
     inactiveClientExpiration :: Maybe ExpirationConfig,
-    -- CA certificate private key is not needed for initialization
-    caCertificateFile :: FilePath,
-    privateKeyFile :: FilePath,
-    certificateFile :: FilePath,
+    xftpCredentials :: ServerCredentials,
     -- | XFTP client-server protocol version range
     xftpServerVRange :: VersionRangeXFTP,
     -- stats config - see SMP server config
@@ -75,7 +71,7 @@ data XFTPServerConfig = XFTPServerConfig
 defaultInactiveClientExpiration :: ExpirationConfig
 defaultInactiveClientExpiration =
   ExpirationConfig
-    { ttl = 43200, -- seconds, 12 hours
+    { ttl = 21600, -- seconds, 6 hours
       checkInterval = 3600 -- seconds, 1 hours
     }
 
@@ -85,7 +81,7 @@ data XFTPEnv = XFTPEnv
     storeLog :: Maybe (StoreLog 'WriteMode),
     random :: TVar ChaChaDRG,
     serverIdentity :: C.KeyHash,
-    tlsServerParams :: T.ServerParams,
+    tlsServerCreds :: T.Credential,
     serverStats :: FileServerStats
   }
 
@@ -99,11 +95,8 @@ defaultFileExpiration =
       checkInterval = 2 * 3600 -- seconds, 2 hours
     }
 
-supportedXFTPhandshakes :: [ALPN]
-supportedXFTPhandshakes = ["xftp/1"]
-
 newXFTPServerEnv :: XFTPServerConfig -> IO XFTPEnv
-newXFTPServerEnv config@XFTPServerConfig {storeLogFile, fileSizeQuota, caCertificateFile, certificateFile, privateKeyFile, transportConfig} = do
+newXFTPServerEnv config@XFTPServerConfig {storeLogFile, fileSizeQuota, xftpCredentials} = do
   random <- C.newRandom
   store <- newFileStore
   storeLog <- mapM (`readWriteFileStore` store) storeLogFile
@@ -112,10 +105,10 @@ newXFTPServerEnv config@XFTPServerConfig {storeLogFile, fileSizeQuota, caCertifi
   forM_ fileSizeQuota $ \quota -> do
     logInfo $ "Total / available storage: " <> tshow quota <> " / " <> tshow (quota - used)
     when (quota < used) $ logInfo "WARNING: storage quota is less than used storage, no files can be uploaded!"
-  tlsServerParams <- loadTLSServerParams caCertificateFile certificateFile privateKeyFile (alpn transportConfig)
-  Fingerprint fp <- loadFingerprint caCertificateFile
+  tlsServerCreds <- loadServerCredential xftpCredentials
+  Fingerprint fp <- loadFingerprint xftpCredentials
   serverStats <- newFileServerStats =<< getCurrentTime
-  pure XFTPEnv {config, store, storeLog, random, tlsServerParams, serverIdentity = C.KeyHash fp, serverStats}
+  pure XFTPEnv {config, store, storeLog, random, tlsServerCreds, serverIdentity = C.KeyHash fp, serverStats}
 
 countUsedStorage :: M.Map k FileRec -> Int64
 countUsedStorage = M.foldl' (\acc FileRec {fileInfo = FileInfo {size}} -> acc + fromIntegral size) 0

src/Simplex/FileTransfer/Server/Main.hs

@@ -19,7 +19,7 @@ import Options.Applicative
 import Simplex.FileTransfer.Chunks
 import Simplex.FileTransfer.Description (FileSize (..))
 import Simplex.FileTransfer.Server (runXFTPServer)
-import Simplex.FileTransfer.Server.Env (XFTPServerConfig (..), defFileExpirationHours, defaultFileExpiration, defaultInactiveClientExpiration, supportedXFTPhandshakes)
+import Simplex.FileTransfer.Server.Env (XFTPServerConfig (..), defFileExpirationHours, defaultFileExpiration, defaultInactiveClientExpiration)
 import Simplex.FileTransfer.Transport (supportedFileServerVRange)
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Encoding.String
@@ -28,7 +28,7 @@ import Simplex.Messaging.Server.CLI
 import Simplex.Messaging.Server.Expiration
 import Simplex.Messaging.Transport (simplexMQVersion)
 import Simplex.Messaging.Transport.Client (TransportHost (..))
-import Simplex.Messaging.Transport.Server (TransportServerConfig (..), defaultTransportServerConfig)
+import Simplex.Messaging.Transport.Server (ServerCredentials (..), TransportServerConfig (..), defaultTransportServerConfig)
 import Simplex.Messaging.Util (safeDecodeUtf8, tshow)
 import System.Directory (createDirectoryIfMissing, doesFileExist)
 import System.FilePath (combine)
@@ -51,7 +51,9 @@ xftpServerCLI cfgPath logPath = do
         True -> readIniFile iniFile >>= either exitError runServer
         _ -> exitError $ "Error: server is not initialized (" <> iniFile <> " does not exist).\nRun `" <> executableName <> " init`."
     Delete -> do
-      confirmOrExit "WARNING: deleting the server will make all queues inaccessible, because the server identity (certificate fingerprint) will change.\nTHIS CANNOT BE UNDONE!"
+      confirmOrExit
+        "WARNING: deleting the server will make all queues inaccessible, because the server identity (certificate fingerprint) will change.\nTHIS CANNOT BE UNDONE!"
+        "Server NOT deleted"
       deleteDirIfExists cfgPath
       deleteDirIfExists logPath
       putStrLn "Deleted configuration and log files"
@@ -101,6 +103,7 @@ xftpServerCLI cfgPath logPath = do
                \\n\
                \# control_port_admin_password:\n\
                \# control_port_user_password:\n\
+               \\n\
                \[TRANSPORT]\n\
                \# host is only used to print server address on start\n"
             <> ("host: " <> T.pack host <> "\n")
@@ -173,9 +176,12 @@ xftpServerCLI cfgPath logPath = do
                     { ttl = readStrictIni "INACTIVE_CLIENTS" "ttl" ini,
                       checkInterval = readStrictIni "INACTIVE_CLIENTS" "check_interval" ini
                     },
-              caCertificateFile = c caCrtFile,
-              privateKeyFile = c serverKeyFile,
-              certificateFile = c serverCrtFile,
+              xftpCredentials =
+                ServerCredentials
+                  { caCertificateFile = Just $ c caCrtFile,
+                    privateKeyFile = c serverKeyFile,
+                    certificateFile = c serverCrtFile
+                  },
               xftpServerVRange = supportedFileServerVRange,
               logStatsInterval = logStats $> 86400, -- seconds
               logStatsStartTime = 0, -- seconds from 00:00 UTC
@@ -183,8 +189,7 @@ xftpServerCLI cfgPath logPath = do
               serverStatsBackupFile = logStats $> combine logPath "file-server-stats.log",
               transportConfig =
                 defaultTransportServerConfig
-                  { logTLSErrors = fromMaybe False $ iniOnOff "TRANSPORT" "log_tls_errors" ini,
-                    alpn = Just supportedXFTPhandshakes
+                  { logTLSErrors = fromMaybe False $ iniOnOff "TRANSPORT" "log_tls_errors" ini
                   },
               responseDelay = 0
             }

src/Simplex/FileTransfer/Server/Stats.hs

@@ -7,25 +7,25 @@ module Simplex.FileTransfer.Server.Stats where
 import Control.Applicative ((<|>))
 import qualified Data.Attoparsec.ByteString.Char8 as A
 import qualified Data.ByteString.Char8 as B
+import Data.IORef
 import Data.Int (Int64)
 import Data.Time.Clock (UTCTime)
 import Simplex.Messaging.Encoding.String
-import Simplex.Messaging.Protocol (SenderId)
 import Simplex.Messaging.Server.Stats (PeriodStats, PeriodStatsData, getPeriodStatsData, newPeriodStats, setPeriodStats)
-import UnliftIO.STM
 
 data FileServerStats = FileServerStats
-  { fromTime :: TVar UTCTime,
-    filesCreated :: TVar Int,
-    fileRecipients :: TVar Int,
-    filesUploaded :: TVar Int,
-    filesExpired :: TVar Int,
-    filesDeleted :: TVar Int,
-    filesDownloaded :: PeriodStats SenderId,
-    fileDownloads :: TVar Int,
-    fileDownloadAcks :: TVar Int,
-    filesCount :: TVar Int,
-    filesSize :: TVar Int64
+  { fromTime :: IORef UTCTime,
+    filesCreated :: IORef Int,
+    fileRecipients :: IORef Int,
+    filesUploaded :: IORef Int,
+    filesExpired :: IORef Int,
+    filesDeleted :: IORef Int,
+    filesBlocked :: IORef Int,
+    filesDownloaded :: PeriodStats,
+    fileDownloads :: IORef Int,
+    fileDownloadAcks :: IORef Int,
+    filesCount :: IORef Int,
+    filesSize :: IORef Int64
   }
 
 data FileServerStatsData = FileServerStatsData
@@ -35,7 +35,8 @@ data FileServerStatsData = FileServerStatsData
     _filesUploaded :: Int,
     _filesExpired :: Int,
     _filesDeleted :: Int,
-    _filesDownloaded :: PeriodStatsData SenderId,
+    _filesBlocked :: Int,
+    _filesDownloaded :: PeriodStatsData,
     _fileDownloads :: Int,
     _fileDownloadAcks :: Int,
     _filesCount :: Int,
@@ -45,50 +46,54 @@ data FileServerStatsData = FileServerStatsData
 
 newFileServerStats :: UTCTime -> IO FileServerStats
 newFileServerStats ts = do
-  fromTime <- newTVarIO ts
-  filesCreated <- newTVarIO 0
-  fileRecipients <- newTVarIO 0
-  filesUploaded <- newTVarIO 0
-  filesExpired <- newTVarIO 0
-  filesDeleted <- newTVarIO 0
+  fromTime <- newIORef ts
+  filesCreated <- newIORef 0
+  fileRecipients <- newIORef 0
+  filesUploaded <- newIORef 0
+  filesExpired <- newIORef 0
+  filesDeleted <- newIORef 0
+  filesBlocked <- newIORef 0
   filesDownloaded <- newPeriodStats
-  fileDownloads <- newTVarIO 0
-  fileDownloadAcks <- newTVarIO 0
-  filesCount <- newTVarIO 0
-  filesSize <- newTVarIO 0
-  pure FileServerStats {fromTime, filesCreated, fileRecipients, filesUploaded, filesExpired, filesDeleted, filesDownloaded, fileDownloads, fileDownloadAcks, filesCount, filesSize}
+  fileDownloads <- newIORef 0
+  fileDownloadAcks <- newIORef 0
+  filesCount <- newIORef 0
+  filesSize <- newIORef 0
+  pure FileServerStats {fromTime, filesCreated, fileRecipients, filesUploaded, filesExpired, filesDeleted, filesBlocked, filesDownloaded, fileDownloads, fileDownloadAcks, filesCount, filesSize}
 
 getFileServerStatsData :: FileServerStats -> IO FileServerStatsData
 getFileServerStatsData s = do
-  _fromTime <- readTVarIO $ fromTime (s :: FileServerStats)
-  _filesCreated <- readTVarIO $ filesCreated s
-  _fileRecipients <- readTVarIO $ fileRecipients s
-  _filesUploaded <- readTVarIO $ filesUploaded s
-  _filesExpired <- readTVarIO $ filesExpired s
-  _filesDeleted <- readTVarIO $ filesDeleted s
+  _fromTime <- readIORef $ fromTime (s :: FileServerStats)
+  _filesCreated <- readIORef $ filesCreated s
+  _fileRecipients <- readIORef $ fileRecipients s
+  _filesUploaded <- readIORef $ filesUploaded s
+  _filesExpired <- readIORef $ filesExpired s
+  _filesDeleted <- readIORef $ filesDeleted s
+  _filesBlocked <- readIORef $ filesBlocked s
   _filesDownloaded <- getPeriodStatsData $ filesDownloaded s
-  _fileDownloads <- readTVarIO $ fileDownloads s
-  _fileDownloadAcks <- readTVarIO $ fileDownloadAcks s
-  _filesCount <- readTVarIO $ filesCount s
-  _filesSize <- readTVarIO $ filesSize s
-  pure FileServerStatsData {_fromTime, _filesCreated, _fileRecipients, _filesUploaded, _filesExpired, _filesDeleted, _filesDownloaded, _fileDownloads, _fileDownloadAcks, _filesCount, _filesSize}
+  _fileDownloads <- readIORef $ fileDownloads s
+  _fileDownloadAcks <- readIORef $ fileDownloadAcks s
+  _filesCount <- readIORef $ filesCount s
+  _filesSize <- readIORef $ filesSize s
+  pure FileServerStatsData {_fromTime, _filesCreated, _fileRecipients, _filesUploaded, _filesExpired, _filesDeleted, _filesBlocked, _filesDownloaded, _fileDownloads, _fileDownloadAcks, _filesCount, _filesSize}
 
-setFileServerStats :: FileServerStats -> FileServerStatsData -> STM ()
+-- this function is not thread safe, it is used on server start only
+setFileServerStats :: FileServerStats -> FileServerStatsData -> IO ()
 setFileServerStats s d = do
-  writeTVar (fromTime (s :: FileServerStats)) $! _fromTime (d :: FileServerStatsData)
-  writeTVar (filesCreated s) $! _filesCreated d
-  writeTVar (fileRecipients s) $! _fileRecipients d
-  writeTVar (filesUploaded s) $! _filesUploaded d
-  writeTVar (filesExpired s) $! _filesExpired d
-  writeTVar (filesDeleted s) $! _filesDeleted d
+  writeIORef (fromTime (s :: FileServerStats)) $! _fromTime (d :: FileServerStatsData)
+  writeIORef (filesCreated s) $! _filesCreated d
+  writeIORef (fileRecipients s) $! _fileRecipients d
+  writeIORef (filesUploaded s) $! _filesUploaded d
+  writeIORef (filesExpired s) $! _filesExpired d
+  writeIORef (filesDeleted s) $! _filesDeleted d
+  writeIORef (filesBlocked s) $! _filesBlocked d
   setPeriodStats (filesDownloaded s) $! _filesDownloaded d
-  writeTVar (fileDownloads s) $! _fileDownloads d
-  writeTVar (fileDownloadAcks s) $! _fileDownloadAcks d
-  writeTVar (filesCount s) $! _filesCount d
-  writeTVar (filesSize s) $! _filesSize d
+  writeIORef (fileDownloads s) $! _fileDownloads d
+  writeIORef (fileDownloadAcks s) $! _fileDownloadAcks d
+  writeIORef (filesCount s) $! _filesCount d
+  writeIORef (filesSize s) $! _filesSize d
 
 instance StrEncoding FileServerStatsData where
-  strEncode FileServerStatsData {_fromTime, _filesCreated, _fileRecipients, _filesUploaded, _filesExpired, _filesDeleted, _filesDownloaded, _fileDownloads, _fileDownloadAcks, _filesCount, _filesSize} =
+  strEncode FileServerStatsData {_fromTime, _filesCreated, _fileRecipients, _filesUploaded, _filesExpired, _filesDeleted, _filesBlocked, _filesDownloaded, _fileDownloads, _fileDownloadAcks, _filesCount, _filesSize} =
     B.unlines
       [ "fromTime=" <> strEncode _fromTime,
         "filesCreated=" <> strEncode _filesCreated,
@@ -96,6 +101,7 @@ instance StrEncoding FileServerStatsData where
         "filesUploaded=" <> strEncode _filesUploaded,
         "filesExpired=" <> strEncode _filesExpired,
         "filesDeleted=" <> strEncode _filesDeleted,
+        "filesBlocked=" <> strEncode _filesBlocked,
         "filesCount=" <> strEncode _filesCount,
         "filesSize=" <> strEncode _filesSize,
         "filesDownloaded:",
@@ -110,9 +116,12 @@ instance StrEncoding FileServerStatsData where
     _filesUploaded <- "filesUploaded=" *> strP <* A.endOfLine
     _filesExpired <- "filesExpired=" *> strP <* A.endOfLine <|> pure 0
     _filesDeleted <- "filesDeleted=" *> strP <* A.endOfLine
+    _filesBlocked <- opt "filesBlocked="
     _filesCount <- "filesCount=" *> strP <* A.endOfLine <|> pure 0
     _filesSize <- "filesSize=" *> strP <* A.endOfLine <|> pure 0
     _filesDownloaded <- "filesDownloaded:" *> A.endOfLine *> strP <* A.endOfLine
     _fileDownloads <- "fileDownloads=" *> strP <* A.endOfLine
     _fileDownloadAcks <- "fileDownloadAcks=" *> strP <* A.endOfLine
-    pure FileServerStatsData {_fromTime, _filesCreated, _fileRecipients, _filesUploaded, _filesExpired, _filesDeleted, _filesDownloaded, _fileDownloads, _fileDownloadAcks, _filesCount, _filesSize}
+    pure FileServerStatsData {_fromTime, _filesCreated, _fileRecipients, _filesUploaded, _filesExpired, _filesDeleted, _filesBlocked, _filesDownloaded, _fileDownloads, _fileDownloadAcks, _filesCount, _filesSize}
+    where
+      opt s = A.string s *> strP <* A.endOfLine <|> pure 0

src/Simplex/FileTransfer/Server/Store.hs

@@ -13,24 +13,27 @@ module Simplex.FileTransfer.Server.Store
     setFilePath,
     addRecipient,
     deleteFile,
+    blockFile,
     deleteRecipient,
     expiredFilePath,
     getFile,
     ackFile,
+    fileTimePrecision,
   )
 where
 
 import Control.Concurrent.STM
+import Control.Monad
 import qualified Data.Attoparsec.ByteString.Char8 as A
 import Data.Int (Int64)
 import Data.Set (Set)
 import qualified Data.Set as S
-import Data.Time.Clock.System (SystemTime (..))
 import Simplex.FileTransfer.Protocol (FileInfo (..), SFileParty (..), XFTPFileId)
 import Simplex.FileTransfer.Transport (XFTPErrorType (..))
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Encoding.String
-import Simplex.Messaging.Protocol (RcvPublicAuthKey, RecipientId, SenderId)
+import Simplex.Messaging.Protocol (BlockingInfo, RcvPublicAuthKey, RecipientId, SenderId)
+import Simplex.Messaging.Server.QueueStore (RoundedSystemTime (..), ServerEntityStatus (..))
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
 import Simplex.Messaging.Util (ifM, ($>>=))
@@ -46,10 +49,15 @@ data FileRec = FileRec
     fileInfo :: FileInfo,
     filePath :: TVar (Maybe FilePath),
     recipientIds :: TVar (Set RecipientId),
-    createdAt :: SystemTime
+    createdAt :: RoundedSystemTime,
+    fileStatus :: TVar ServerEntityStatus
   }
 
+fileTimePrecision :: Int64
+fileTimePrecision = 3600 -- truncate creation time to 1 hour
+
 data FileRecipient = FileRecipient RecipientId RcvPublicAuthKey
+  deriving (Show)
 
 instance StrEncoding FileRecipient where
   strEncode (FileRecipient rId rKey) = strEncode rId <> ":" <> strEncode rKey
@@ -62,18 +70,19 @@ newFileStore = do
   usedStorage <- newTVarIO 0
   pure FileStore {files, recipients, usedStorage}
 
-addFile :: FileStore -> SenderId -> FileInfo -> SystemTime -> STM (Either XFTPErrorType ())
+addFile :: FileStore -> SenderId -> FileInfo -> RoundedSystemTime -> STM (Either XFTPErrorType ())
 addFile FileStore {files} sId fileInfo createdAt =
   ifM (TM.member sId files) (pure $ Left DUPLICATE_) $ do
     f <- newFileRec sId fileInfo createdAt
     TM.insert sId f files
     pure $ Right ()
 
-newFileRec :: SenderId -> FileInfo -> SystemTime -> STM FileRec
+newFileRec :: SenderId -> FileInfo -> RoundedSystemTime -> STM FileRec
 newFileRec senderId fileInfo createdAt = do
   recipientIds <- newTVar S.empty
   filePath <- newTVar Nothing
-  pure FileRec {senderId, fileInfo, filePath, recipientIds, createdAt}
+  fileStatus <- newTVar EntityActive
+  pure FileRec {senderId, fileInfo, filePath, recipientIds, createdAt, fileStatus}
 
 setFilePath :: FileStore -> SenderId -> FilePath -> STM (Either XFTPErrorType ())
 setFilePath st sId fPath =
@@ -104,6 +113,14 @@ deleteFile FileStore {files, recipients, usedStorage} senderId = do
       pure $ Right ()
     _ -> pure $ Left AUTH
 
+-- this function must be called after the file is deleted from the file system
+blockFile :: FileStore -> SenderId -> BlockingInfo -> Bool -> STM (Either XFTPErrorType ())
+blockFile st@FileStore {usedStorage} senderId info deleted =
+  withFile st senderId $ \FileRec {fileInfo, fileStatus} -> do
+    when deleted $ modifyTVar' usedStorage $ subtract (fromIntegral $ size fileInfo)
+    writeTVar fileStatus $! EntityBlocked info
+    pure $ Right ()
+
 deleteRecipient :: FileStore -> RecipientId -> FileRec -> STM ()
 deleteRecipient FileStore {recipients} rId FileRec {recipientIds} = do
   TM.delete rId recipients
@@ -120,8 +137,8 @@ getFile st party fId = case party of
 expiredFilePath :: FileStore -> XFTPFileId -> Int64 -> STM (Maybe (Maybe FilePath))
 expiredFilePath FileStore {files} sId old =
   TM.lookup sId files
-    $>>= \FileRec {filePath, createdAt} ->
-      if systemSeconds createdAt < old
+    $>>= \FileRec {filePath, createdAt = RoundedSystemTime createdAt} ->
+      if createdAt + fileTimePrecision < old
         then Just <$> readTVar filePath
         else pure Nothing
 

src/Simplex/FileTransfer/Server/StoreLog.hs

@@ -14,6 +14,7 @@ module Simplex.FileTransfer.Server.StoreLog
     logPutFile,
     logAddRecipients,
     logDeleteFile,
+    logBlockFile,
     logAckFile,
   )
 where
@@ -28,22 +29,23 @@ import Data.List.NonEmpty (NonEmpty)
 import qualified Data.List.NonEmpty as L
 import Data.Map.Strict (Map)
 import qualified Data.Map.Strict as M
-import Data.Time.Clock.System (SystemTime)
 import Simplex.FileTransfer.Protocol (FileInfo (..))
 import Simplex.FileTransfer.Server.Store
 import Simplex.Messaging.Encoding.String
-import Simplex.Messaging.Protocol (RcvPublicAuthKey, RecipientId, SenderId)
+import Simplex.Messaging.Protocol (BlockingInfo, RcvPublicAuthKey, RecipientId, SenderId)
+import Simplex.Messaging.Server.QueueStore (RoundedSystemTime)
 import Simplex.Messaging.Server.StoreLog
-import Simplex.Messaging.Util (bshow, whenM)
-import System.Directory (doesFileExist, renameFile)
+import Simplex.Messaging.Util (bshow)
 import System.IO
 
 data FileStoreLogRecord
-  = AddFile SenderId FileInfo SystemTime
+  = AddFile SenderId FileInfo RoundedSystemTime
   | PutFile SenderId FilePath
   | AddRecipients SenderId (NonEmpty FileRecipient)
   | DeleteFile SenderId
-  | AckFile RecipientId
+  | BlockFile SenderId BlockingInfo
+  | AckFile RecipientId -- TODO add senderId as well?
+  deriving (Show)
 
 instance StrEncoding FileStoreLogRecord where
   strEncode = \case
@@ -51,6 +53,7 @@ instance StrEncoding FileStoreLogRecord where
     PutFile sId path -> strEncode (Str "FPUT", sId, path)
     AddRecipients sId rcps -> strEncode (Str "FADD", sId, rcps)
     DeleteFile sId -> strEncode (Str "FDEL", sId)
+    BlockFile sId info -> strEncode (Str "FBLK", sId, info)
     AckFile rId -> strEncode (Str "FACK", rId)
   strP =
     A.choice
@@ -58,13 +61,14 @@ instance StrEncoding FileStoreLogRecord where
         "FPUT " *> (PutFile <$> strP_ <*> strP),
         "FADD " *> (AddRecipients <$> strP_ <*> strP),
         "FDEL " *> (DeleteFile <$> strP),
+        "FBLK " *> (BlockFile <$> strP_ <*> strP),
         "FACK " *> (AckFile <$> strP)
       ]
 
 logFileStoreRecord :: StoreLog 'WriteMode -> FileStoreLogRecord -> IO ()
 logFileStoreRecord = writeStoreLogRecord
 
-logAddFile :: StoreLog 'WriteMode -> SenderId -> FileInfo -> SystemTime -> IO ()
+logAddFile :: StoreLog 'WriteMode -> SenderId -> FileInfo -> RoundedSystemTime -> IO ()
 logAddFile s = logFileStoreRecord s .:. AddFile
 
 logPutFile :: StoreLog 'WriteMode -> SenderId -> FilePath -> IO ()
@@ -76,17 +80,14 @@ logAddRecipients s = logFileStoreRecord s .: AddRecipients
 logDeleteFile :: StoreLog 'WriteMode -> SenderId -> IO ()
 logDeleteFile s = logFileStoreRecord s . DeleteFile
 
+logBlockFile :: StoreLog 'WriteMode -> SenderId -> BlockingInfo -> IO ()
+logBlockFile s fId = logFileStoreRecord s . BlockFile fId
+
 logAckFile :: StoreLog 'WriteMode -> RecipientId -> IO ()
 logAckFile s = logFileStoreRecord s . AckFile
 
 readWriteFileStore :: FilePath -> FileStore -> IO (StoreLog 'WriteMode)
-readWriteFileStore f st = do
-  whenM (doesFileExist f) $ do
-    readFileStore f st
-    renameFile f $ f <> ".bak"
-  s <- openWriteStoreLog f
-  writeFileStore s st
-  pure s
+readWriteFileStore = readWriteStoreLog readFileStore writeFileStore
 
 readFileStore :: FilePath -> FileStore -> IO ()
 readFileStore f st = mapM_ (addFileLogRecord . LB.toStrict) . LB.lines =<< LB.readFile f
@@ -102,6 +103,7 @@ readFileStore f st = mapM_ (addFileLogRecord . LB.toStrict) . LB.lines =<< LB.re
       PutFile qId path -> setFilePath st qId path
       AddRecipients sId rcps -> runExceptT $ addRecipients sId rcps
       DeleteFile sId -> deleteFile st sId
+      BlockFile sId info -> blockFile st sId info True
       AckFile rId -> ackFile st rId
     addRecipients sId rcps = mapM_ (ExceptT . addRecipient st sId) rcps
 

src/Simplex/FileTransfer/Transport.hs

@@ -11,7 +11,9 @@
 module Simplex.FileTransfer.Transport
   ( supportedFileServerVRange,
     authCmdsXFTPVersion,
+    blockedFilesXFTPVersion,
     xftpClientHandshakeStub,
+    supportedXFTPhandshakes,
     XFTPClientHandshake (..),
     -- xftpClientHandshake,
     XFTPServerHandshake (..),
@@ -32,7 +34,6 @@ module Simplex.FileTransfer.Transport
   )
 where
 
-import Control.Applicative ((<|>))
 import qualified Control.Exception as E
 import Control.Logger.Simple
 import Control.Monad
@@ -56,8 +57,8 @@ import qualified Simplex.Messaging.Crypto.Lazy as LC
 import Simplex.Messaging.Encoding
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Parsers
-import Simplex.Messaging.Protocol (CommandError)
-import Simplex.Messaging.Transport (SessionId, THandle (..), THandleParams (..), TransportError (..), TransportPeer (..))
+import Simplex.Messaging.Protocol (BlockingInfo, CommandError)
+import Simplex.Messaging.Transport (ALPN, SessionId, THandle (..), THandleParams (..), TransportError (..), TransportPeer (..))
 import Simplex.Messaging.Transport.HTTP2.File
 import Simplex.Messaging.Util (bshow, tshow)
 import Simplex.Messaging.Version
@@ -91,15 +92,21 @@ initialXFTPVersion = VersionXFTP 1
 authCmdsXFTPVersion :: VersionXFTP
 authCmdsXFTPVersion = VersionXFTP 2
 
+blockedFilesXFTPVersion :: VersionXFTP
+blockedFilesXFTPVersion = VersionXFTP 3
+
 currentXFTPVersion :: VersionXFTP
-currentXFTPVersion = VersionXFTP 2
+currentXFTPVersion = VersionXFTP 3
 
 supportedFileServerVRange :: VersionRangeXFTP
 supportedFileServerVRange = mkVersionRange initialXFTPVersion currentXFTPVersion
 
 -- XFTP protocol does not use this handshake method
-xftpClientHandshakeStub :: c -> Maybe C.KeyPairX25519 -> C.KeyHash -> VersionRangeXFTP -> ExceptT TransportError IO (THandle XFTPVersion c 'TClient)
-xftpClientHandshakeStub _c _ks _keyHash _xftpVRange = throwE TEVersion
+xftpClientHandshakeStub :: c -> Maybe C.KeyPairX25519 -> C.KeyHash -> VersionRangeXFTP -> Bool -> ExceptT TransportError IO (THandle XFTPVersion c 'TClient)
+xftpClientHandshakeStub _c _ks _keyHash _xftpVRange _proxyServer = throwE TEVersion
+
+supportedXFTPhandshakes :: [ALPN]
+supportedXFTPhandshakes = ["xftp/1"]
 
 data XFTPServerHandshake = XFTPServerHandshake
   { xftpVersionRange :: VersionRangeXFTP,
@@ -207,6 +214,8 @@ data XFTPErrorType
     CMD {cmdErr :: CommandError}
   | -- | command authorization error - bad signature or non-existing SMP queue
     AUTH
+  | -- | command with the entity that was blocked
+    BLOCKED {blockInfo :: BlockingInfo}
   | -- | incorrent file size
     SIZE
   | -- | storage quota exceeded
@@ -227,15 +236,46 @@ data XFTPErrorType
     INTERNAL
   | -- | used internally, never returned by the server (to be removed)
     DUPLICATE_ -- not part of SMP protocol, used internally
-  deriving (Eq, Read, Show)
+  deriving (Eq, Show)
 
 instance StrEncoding XFTPErrorType where
   strEncode = \case
+    BLOCK -> "BLOCK"
+    SESSION -> "SESSION"
+    HANDSHAKE -> "HANDSHAKE"
     CMD e -> "CMD " <> bshow e
-    e -> bshow e
+    AUTH -> "AUTH"
+    BLOCKED info -> "BLOCKED " <> strEncode info
+    SIZE -> "SIZE"
+    QUOTA -> "QUOTA"
+    DIGEST -> "DIGEST"
+    CRYPTO -> "CRYPTO"
+    NO_FILE -> "NO_FILE"
+    HAS_FILE -> "HAS_FILE"
+    FILE_IO -> "FILE_IO"
+    TIMEOUT -> "TIMEOUT"
+    INTERNAL -> "INTERNAL"
+    DUPLICATE_ -> "DUPLICATE_"
+
   strP =
-    "CMD " *> (CMD <$> parseRead1)
-      <|> parseRead1
+    A.takeTill (== ' ') >>= \case
+      "BLOCK" -> pure BLOCK
+      "SESSION" -> pure SESSION
+      "HANDSHAKE" -> pure HANDSHAKE
+      "CMD" -> CMD <$> parseRead1
+      "AUTH" -> pure AUTH
+      "BLOCKED" -> BLOCKED <$> _strP
+      "SIZE" -> pure SIZE
+      "QUOTA" -> pure QUOTA
+      "DIGEST" -> pure DIGEST
+      "CRYPTO" -> pure CRYPTO
+      "NO_FILE" -> pure NO_FILE
+      "HAS_FILE" -> pure HAS_FILE
+      "FILE_IO" -> pure FILE_IO
+      "TIMEOUT" -> pure TIMEOUT
+      "INTERNAL" -> pure INTERNAL
+      "DUPLICATE_" -> pure DUPLICATE_
+      _ -> fail "bad error type"
 
 instance Encoding XFTPErrorType where
   smpEncode = \case
@@ -244,6 +284,7 @@ instance Encoding XFTPErrorType where
     HANDSHAKE -> "HANDSHAKE"
     CMD err -> "CMD " <> smpEncode err
     AUTH -> "AUTH"
+    BLOCKED info -> "BLOCKED " <> smpEncode info
     SIZE -> "SIZE"
     QUOTA -> "QUOTA"
     DIGEST -> "DIGEST"
@@ -262,6 +303,7 @@ instance Encoding XFTPErrorType where
       "HANDSHAKE" -> pure HANDSHAKE
       "CMD" -> CMD <$> _smpP
       "AUTH" -> pure AUTH
+      "BLOCKED" -> BLOCKED <$> _smpP
       "SIZE" -> pure SIZE
       "QUOTA" -> pure QUOTA
       "DIGEST" -> pure DIGEST

src/Simplex/FileTransfer/Types.hs

@@ -13,8 +13,6 @@ import Data.Int (Int64)
 import qualified Data.Text as T
 import Data.Text.Encoding (encodeUtf8)
 import Data.Word (Word32)
-import Database.SQLite.Simple.FromField (FromField (..))
-import Database.SQLite.Simple.ToField (ToField (..))
 import Simplex.FileTransfer.Client (XFTPChunkSpec (..))
 import Simplex.FileTransfer.Description
 import qualified Simplex.Messaging.Crypto as C
@@ -24,10 +22,11 @@ import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Parsers
 import Simplex.Messaging.Protocol (XFTPServer)
 import System.FilePath ((</>))
+import Simplex.Messaging.Agent.Store.DB (FromField (..), ToField (..))
 
-type RcvFileId = ByteString
+type RcvFileId = ByteString -- Agent entity ID
 
-type SndFileId = ByteString
+type SndFileId = ByteString -- Agent entity ID
 
 authTagSize :: Int64
 authTagSize = fromIntegral C.authTagSize
@@ -246,6 +245,16 @@ data DeletedSndChunkReplica = DeletedSndChunkReplica
   }
   deriving (Show)
 
+data SentRecipientReplica = SentRecipientReplica
+  { chunkNo :: Int,
+    server :: XFTPServer,
+    rcvNo :: Int,
+    replicaId :: ChunkReplicaId,
+    replicaKey :: C.APrivateAuthKey,
+    digest :: FileDigest,
+    chunkSize :: FileSize Word32
+  }
+
 data FileErrorType
   = -- | cannot proceed with download from not approved relays without proxy
     NOT_APPROVED

src/Simplex/Messaging/Agent.hs

@@ -1,3 +1,4 @@
+{-# LANGUAGE BangPatterns #-}
 {-# LANGUAGE ConstraintKinds #-}
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE DuplicateRecordFields #-}
@@ -55,14 +56,15 @@ module Simplex.Messaging.Agent
     createConnection,
     changeConnectionUser,
     prepareConnectionToJoin,
+    prepareConnectionToAccept,
     joinConnection,
     allowConnection,
     acceptContact,
     rejectContact,
     subscribeConnection,
     subscribeConnections,
-    getConnectionMessage,
-    getNotificationMessage,
+    getConnectionMessages,
+    getNotificationConns,
     resubscribeConnection,
     resubscribeConnections,
     sendMessage,
@@ -118,6 +120,8 @@ module Simplex.Messaging.Agent
     debugAgentLocks,
     getAgentSubscriptions,
     logConnection,
+    -- for tests
+    withAgentEnv,
   )
 where
 
@@ -132,7 +136,7 @@ import Data.Bifunctor (bimap, first, second)
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
 import Data.Composition ((.:), (.:.), (.::), (.::.))
-import Data.Either (isRight, rights)
+import Data.Either (isRight, partitionEithers, rights)
 import Data.Foldable (foldl', toList)
 import Data.Functor (($>))
 import Data.Functor.Identity
@@ -163,25 +167,27 @@ import Simplex.Messaging.Agent.Protocol
 import Simplex.Messaging.Agent.RetryInterval
 import Simplex.Messaging.Agent.Stats
 import Simplex.Messaging.Agent.Store
-import Simplex.Messaging.Agent.Store.SQLite
-import qualified Simplex.Messaging.Agent.Store.SQLite.DB as DB
-import qualified Simplex.Messaging.Agent.Store.SQLite.Migrations as Migrations
-import Simplex.Messaging.Client (ProtocolClient (..), SMPClientError, ServerTransmission (..), ServerTransmissionBatch, temporaryClientError, unexpectedResponse)
+import Simplex.Messaging.Agent.Store.AgentStore
+import Simplex.Messaging.Agent.Store.Common (DBStore)
+import qualified Simplex.Messaging.Agent.Store.DB as DB
+import Simplex.Messaging.Agent.Store.Interface (closeDBStore, execSQL)
+import qualified Simplex.Messaging.Agent.Store.Migrations as Migrations
+import Simplex.Messaging.Agent.Store.Shared (UpMigration (..), upMigration)
+import Simplex.Messaging.Client (SMPClientError, ServerTransmission (..), ServerTransmissionBatch, temporaryClientError, unexpectedResponse)
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Crypto.File (CryptoFile, CryptoFileArgs)
 import Simplex.Messaging.Crypto.Ratchet (PQEncryption, PQSupport (..), pattern PQEncOff, pattern PQEncOn, pattern PQSupportOff, pattern PQSupportOn)
 import qualified Simplex.Messaging.Crypto.Ratchet as CR
 import Simplex.Messaging.Encoding
 import Simplex.Messaging.Encoding.String
-import Simplex.Messaging.Notifications.Protocol (DeviceToken, NtfRegCode (NtfRegCode), NtfTknStatus (..), NtfTokenId)
-import Simplex.Messaging.Notifications.Server.Push.APNS (PNMessageData (..))
+import Simplex.Messaging.Notifications.Protocol (DeviceToken, NtfRegCode (NtfRegCode), NtfTknStatus (..), NtfTokenId, PNMessageData (..), pnMessagesP)
 import Simplex.Messaging.Notifications.Types
 import Simplex.Messaging.Parsers (parse)
-import Simplex.Messaging.Protocol (BrokerMsg, Cmd (..), EntityId, ErrorType (AUTH), MsgBody, MsgFlags (..), NtfServer, ProtoServerWithAuth, ProtocolType (..), ProtocolTypeI (..), SMPMsgMeta, SParty (..), SProtocolType (..), SndPublicAuthKey, SubscriptionMode (..), UserProtocol, VersionSMPC, sndAuthKeySMPClientVersion)
+import Simplex.Messaging.Protocol (BrokerMsg, Cmd (..), ErrorType (AUTH), MsgBody, MsgFlags (..), NtfServer, ProtoServerWithAuth, ProtocolType (..), ProtocolTypeI (..), SMPMsgMeta, SParty (..), SProtocolType (..), SndPublicAuthKey, SubscriptionMode (..), UserProtocol, VersionSMPC, sndAuthKeySMPClientVersion)
 import qualified Simplex.Messaging.Protocol as SMP
 import Simplex.Messaging.ServiceScheme (ServiceScheme (..))
 import qualified Simplex.Messaging.TMap as TM
-import Simplex.Messaging.Transport (SMPVersion, THandleParams (sessionId))
+import Simplex.Messaging.Transport (SMPVersion)
 import Simplex.Messaging.Util
 import Simplex.Messaging.Version
 import Simplex.RemoteControl.Client
@@ -197,11 +203,11 @@ import UnliftIO.STM
 type AE a = ExceptT AgentErrorType IO a
 
 -- | Creates an SMP agent client instance
-getSMPAgentClient :: AgentConfig -> InitialAgentServers -> SQLiteStore -> Bool -> IO AgentClient
+getSMPAgentClient :: AgentConfig -> InitialAgentServers -> DBStore -> Bool -> IO AgentClient
 getSMPAgentClient = getSMPAgentClient_ 1
 {-# INLINE getSMPAgentClient #-}
 
-getSMPAgentClient_ :: Int -> AgentConfig -> InitialAgentServers -> SQLiteStore -> Bool -> IO AgentClient
+getSMPAgentClient_ :: Int -> AgentConfig -> InitialAgentServers -> DBStore -> Bool -> IO AgentClient
 getSMPAgentClient_ clientId cfg initServers@InitialAgentServers {smp, xftp} store backgroundMode =
   newSMPAgentEnv cfg store >>= runReaderT runAgent
   where
@@ -274,7 +280,7 @@ disposeAgentClient c@AgentClient {acThread, agentEnv = Env {store}} = do
   t_ <- atomically (swapTVar acThread Nothing) $>>= (liftIO . deRefWeak)
   disconnectAgentClient c
   mapM_ killThread t_
-  liftIO $ closeSQLiteStore store
+  liftIO $ closeDBStore store
 
 resumeAgentClient :: AgentClient -> IO ()
 resumeAgentClient c = atomically $ writeTVar (active c) True
@@ -331,10 +337,10 @@ deleteConnectionsAsync c waitDelivery = withAgentEnv c . deleteConnectionsAsync'
 
 -- | Create SMP agent connection (NEW command)
 createConnection :: AgentClient -> UserId -> Bool -> SConnectionMode c -> Maybe CRClientData -> CR.InitialKeys -> SubscriptionMode -> AE (ConnId, ConnectionRequestUri c)
-createConnection c userId enableNtfs = withAgentEnv c .:: newConn c userId "" enableNtfs
+createConnection c userId enableNtfs = withAgentEnv c .:: newConn c userId enableNtfs
 {-# INLINE createConnection #-}
 
--- | Changes the user id associated with a connection 
+-- | Changes the user id associated with a connection
 changeConnectionUser :: AgentClient -> UserId -> ConnId -> UserId -> AE ()
 changeConnectionUser c oldUserId connId newUserId = withAgentEnv c $ changeConnectionUser' c oldUserId connId newUserId
 {-# INLINE changeConnectionUser #-}
@@ -347,10 +353,13 @@ changeConnectionUser c oldUserId connId newUserId = withAgentEnv c $ changeConne
 prepareConnectionToJoin :: AgentClient -> UserId -> Bool -> ConnectionRequestUri c -> PQSupport -> AE ConnId
 prepareConnectionToJoin c userId enableNtfs = withAgentEnv c .: newConnToJoin c userId "" enableNtfs
 
+-- | Create SMP agent connection without queue (to be joined with acceptContact passing invitation ID).
+prepareConnectionToAccept :: AgentClient -> Bool -> ConfirmationId -> PQSupport -> AE ConnId
+prepareConnectionToAccept c enableNtfs = withAgentEnv c .: newConnToAccept c "" enableNtfs
+
 -- | Join SMP agent connection (JOIN command).
-joinConnection :: AgentClient -> UserId -> Maybe ConnId -> Bool -> ConnectionRequestUri c -> ConnInfo -> PQSupport -> SubscriptionMode -> AE (ConnId, SndQueueSecured)
-joinConnection c userId Nothing enableNtfs = withAgentEnv c .:: joinConn c userId "" False enableNtfs
-joinConnection c userId (Just connId) enableNtfs = withAgentEnv c .:: joinConn c userId connId True enableNtfs
+joinConnection :: AgentClient -> UserId -> ConnId -> Bool -> ConnectionRequestUri c -> ConnInfo -> PQSupport -> SubscriptionMode -> AE SndQueueSecured
+joinConnection c userId connId enableNtfs = withAgentEnv c .:: joinConn c userId connId enableNtfs
 {-# INLINE joinConnection #-}
 
 -- | Allow connection to continue after CONF notification (LET command)
@@ -359,8 +368,8 @@ allowConnection c = withAgentEnv c .:. allowConnection' c
 {-# INLINE allowConnection #-}
 
 -- | Accept contact after REQ notification (ACPT command)
-acceptContact :: AgentClient -> Bool -> ConfirmationId -> ConnInfo -> PQSupport -> SubscriptionMode -> AE (ConnId, SndQueueSecured)
-acceptContact c enableNtfs = withAgentEnv c .:: acceptContact' c "" enableNtfs
+acceptContact :: AgentClient -> ConnId -> Bool -> ConfirmationId -> ConnInfo -> PQSupport -> SubscriptionMode -> AE SndQueueSecured
+acceptContact c connId enableNtfs = withAgentEnv c .:: acceptContact' c connId enableNtfs
 {-# INLINE acceptContact #-}
 
 -- | Reject contact (RJCT command)
@@ -378,15 +387,15 @@ subscribeConnections :: AgentClient -> [ConnId] -> AE (Map ConnId (Either AgentE
 subscribeConnections c = withAgentEnv c . subscribeConnections' c
 {-# INLINE subscribeConnections #-}
 
--- | Get connection message (GET command)
-getConnectionMessage :: AgentClient -> ConnId -> AE (Maybe SMPMsgMeta)
-getConnectionMessage c = withAgentEnv c . getConnectionMessage' c
-{-# INLINE getConnectionMessage #-}
+-- | Get messages for connections (GET commands)
+getConnectionMessages :: AgentClient -> NonEmpty ConnId -> IO (NonEmpty (Maybe SMPMsgMeta))
+getConnectionMessages c = withAgentEnv' c . getConnectionMessages' c
+{-# INLINE getConnectionMessages #-}
 
--- | Get connection message for received notification
-getNotificationMessage :: AgentClient -> C.CbNonce -> ByteString -> AE (NotificationInfo, Maybe SMPMsgMeta)
-getNotificationMessage c = withAgentEnv c .: getNotificationMessage' c
-{-# INLINE getNotificationMessage #-}
+-- | Get connections for received notification
+getNotificationConns :: AgentClient -> C.CbNonce -> ByteString -> AE (NonEmpty NotificationInfo)
+getNotificationConns c = withAgentEnv c .: getNotificationConns' c
+{-# INLINE getNotificationConns #-}
 
 resubscribeConnection :: AgentClient -> ConnId -> AE ()
 resubscribeConnection c = withAgentEnv c . resubscribeConnection' c
@@ -473,14 +482,14 @@ testProtocolServer c userId srv = withAgentEnv' c $ case protocolTypeI @p of
 
 -- | set SOCKS5 proxy on/off and optionally set TCP timeouts for fast network
 setNetworkConfig :: AgentClient -> NetworkConfig -> IO ()
-setNetworkConfig c@AgentClient {useNetworkConfig} cfg' = do
-  changed <- atomically $ do
+setNetworkConfig c@AgentClient {useNetworkConfig, proxySessTs} cfg' = do
+  (spChanged, changed) <- atomically $ do
     (_, cfg) <- readTVar useNetworkConfig
-    if cfg == cfg'
-      then pure False
-      else
-        let cfgSlow = slowNetworkConfig cfg'
-         in True <$ (cfgSlow `seq` writeTVar useNetworkConfig (cfgSlow, cfg'))
+    let changed = cfg /= cfg'
+        !cfgSlow = slowNetworkConfig cfg'
+    when changed $ writeTVar useNetworkConfig (cfgSlow, cfg')
+    pure (socksProxy cfg /= socksProxy cfg', changed)
+  when spChanged $ getCurrentTime >>= atomically . writeTVar proxySessTs
   when changed $ reconnectAllServers c
 
 setUserNetworkInfo :: AgentClient -> UserNetworkInfo -> IO ()
@@ -648,15 +657,15 @@ deleteUser' c@AgentClient {smpServersStats, xftpServersStats} userId delSMPQueue
 
 newConnAsync :: ConnectionModeI c => AgentClient -> UserId -> ACorrId -> Bool -> SConnectionMode c -> CR.InitialKeys -> SubscriptionMode -> AM ConnId
 newConnAsync c userId corrId enableNtfs cMode pqInitKeys subMode = do
-  connId <- newConnNoQueues c userId "" enableNtfs cMode (CR.connPQEncryption pqInitKeys)
+  connId <- newConnNoQueues c userId enableNtfs cMode (CR.connPQEncryption pqInitKeys)
   enqueueCommand c corrId connId Nothing $ AClientCommand $ NEW enableNtfs (ACM cMode) pqInitKeys subMode
   pure connId
 
-newConnNoQueues :: AgentClient -> UserId -> ConnId -> Bool -> SConnectionMode c -> PQSupport -> AM ConnId
-newConnNoQueues c userId connId enableNtfs cMode pqSupport = do
+newConnNoQueues :: AgentClient -> UserId -> Bool -> SConnectionMode c -> PQSupport -> AM ConnId
+newConnNoQueues c userId enableNtfs cMode pqSupport = do
   g <- asks random
   connAgentVersion <- asks $ maxVersion . smpAgentVRange . config
-  let cData = ConnData {userId, connId, connAgentVersion, enableNtfs, lastExternalSndId = 0, deleted = False, ratchetSyncState = RSOk, pqSupport}
+  let cData = ConnData {userId, connId = "", connAgentVersion, enableNtfs, lastExternalSndId = 0, deleted = False, ratchetSyncState = RSOk, pqSupport}
   withStore c $ \db -> createNewConn db g cData cMode
 
 joinConnAsync :: AgentClient -> UserId -> ACorrId -> Bool -> ConnectionRequestUri c -> ConnInfo -> PQSupport -> SubscriptionMode -> AM ConnId
@@ -681,9 +690,15 @@ allowConnectionAsync' c corrId connId confId ownConnInfo =
       enqueueCommand c corrId connId (Just server) $ AClientCommand $ LET confId ownConnInfo
     _ -> throwE $ CMD PROHIBITED "allowConnectionAsync"
 
+-- TODO
+-- Unlike `acceptContact` (synchronous version), `acceptContactAsync` uses `unacceptInvitation` in case of error,
+-- because we're not taking lock here. In practice it is less likely to fail because it doesn't involve network IO,
+-- and also it can't be triggered by user concurrently several times in a row. It could be improved similarly to
+-- `acceptContact` by creating a new map for invitation locks and taking lock here, and removing `unacceptInvitation`
+-- while marking invitation as accepted inside "lock level transaction" after successful `joinConnAsync`.
 acceptContactAsync' :: AgentClient -> ACorrId -> Bool -> InvitationId -> ConnInfo -> PQSupport -> SubscriptionMode -> AM ConnId
 acceptContactAsync' c corrId enableNtfs invId ownConnInfo pqSupport subMode = do
-  Invitation {contactConnId, connReq} <- withStore c (`getInvitation` invId)
+  Invitation {contactConnId, connReq} <- withStore c $ \db -> getInvitation db "acceptContactAsync'" invId
   withStore c (`getConn` contactConnId) >>= \case
     SomeConn _ (ContactConnection ConnData {userId} _) -> do
       withStore' c $ \db -> acceptInvitation db invId ownConnInfo
@@ -743,9 +758,12 @@ switchConnectionAsync' c corrId connId =
             pure . connectionStats $ DuplexConnection cData rqs' sqs
       _ -> throwE $ CMD PROHIBITED "switchConnectionAsync: not duplex"
 
-newConn :: AgentClient -> UserId -> ConnId -> Bool -> SConnectionMode c -> Maybe CRClientData -> CR.InitialKeys -> SubscriptionMode -> AM (ConnId, ConnectionRequestUri c)
-newConn c userId connId enableNtfs cMode clientData pqInitKeys subMode =
-  getSMPServer c userId >>= newConnSrv c userId connId False enableNtfs cMode clientData pqInitKeys subMode
+newConn :: AgentClient -> UserId -> Bool -> SConnectionMode c -> Maybe CRClientData -> CR.InitialKeys -> SubscriptionMode -> AM (ConnId, ConnectionRequestUri c)
+newConn c userId enableNtfs cMode clientData pqInitKeys subMode = do
+  srv <- getSMPServer c userId
+  connId <- newConnNoQueues c userId enableNtfs cMode (CR.connPQEncryption pqInitKeys)
+  cReq <- newRcvConnSrv c userId connId enableNtfs cMode clientData pqInitKeys subMode srv
+  pure (connId, cReq)
 
 changeConnectionUser' :: AgentClient -> UserId -> ConnId -> UserId -> AM ()
 changeConnectionUser' c oldUserId connId newUserId = do
@@ -757,15 +775,7 @@ changeConnectionUser' c oldUserId connId newUserId = do
   where
     updateConn = withStore' c $ \db -> setConnUserId db oldUserId connId newUserId
 
-newConnSrv :: AgentClient -> UserId -> ConnId -> Bool -> Bool -> SConnectionMode c -> Maybe CRClientData -> CR.InitialKeys -> SubscriptionMode -> SMPServerWithAuth -> AM (ConnId, ConnectionRequestUri c)
-newConnSrv c userId connId hasNewConn enableNtfs cMode clientData pqInitKeys subMode srv = do
-  connId' <-
-    if hasNewConn
-      then pure connId
-      else newConnNoQueues c userId connId enableNtfs cMode (CR.connPQEncryption pqInitKeys)
-  newRcvConnSrv c userId connId' enableNtfs cMode clientData pqInitKeys subMode srv
-
-newRcvConnSrv :: AgentClient -> UserId -> ConnId -> Bool -> SConnectionMode c -> Maybe CRClientData -> CR.InitialKeys -> SubscriptionMode -> SMPServerWithAuth -> AM (ConnId, ConnectionRequestUri c)
+newRcvConnSrv :: AgentClient -> UserId -> ConnId -> Bool -> SConnectionMode c -> Maybe CRClientData -> CR.InitialKeys -> SubscriptionMode -> SMPServerWithAuth -> AM (ConnectionRequestUri c)
 newRcvConnSrv c userId connId enableNtfs cMode clientData pqInitKeys subMode srvWithAuth@(ProtoServerWithAuth srv _) = do
   case (cMode, pqInitKeys) of
     (SCMContact, CR.IKUsePQ) -> throwE $ CMD PROHIBITED "newRcvConnSrv"
@@ -778,15 +788,15 @@ newRcvConnSrv c userId connId enableNtfs cMode clientData pqInitKeys subMode srv
   lift . when (subMode == SMSubscribe) $ addNewQueueSubscription c rq' tSess sessId
   when enableNtfs $ do
     ns <- asks ntfSupervisor
-    atomically $ sendNtfSubCommand ns (connId, NSCCreate)
+    atomically $ sendNtfSubCommand ns (NSCCreate, [connId])
   let crData = ConnReqUriData SSSimplex smpAgentVRange [qUri] clientData
   case cMode of
-    SCMContact -> pure (connId, CRContactUri crData)
+    SCMContact -> pure $ CRContactUri crData
     SCMInvitation -> do
       g <- asks random
       (pk1, pk2, pKem, e2eRcvParams) <- liftIO $ CR.generateRcvE2EParams g (maxVersion e2eEncryptVRange) (CR.initialPQEncryption pqInitKeys)
       withStore' c $ \db -> createRatchetX3dhKeys db connId pk1 pk2 pKem
-      pure (connId, CRInvitationUri crData $ toVersionRangeT e2eRcvParams e2eEncryptVRange)
+      pure $ CRInvitationUri crData $ toVersionRangeT e2eRcvParams e2eEncryptVRange
 
 newConnToJoin :: forall c. AgentClient -> UserId -> ConnId -> Bool -> ConnectionRequestUri c -> PQSupport -> AM ConnId
 newConnToJoin c userId connId enableNtfs cReq pqSup = case cReq of
@@ -806,34 +816,60 @@ newConnToJoin c userId connId enableNtfs cReq pqSup = case cReq of
           cData = ConnData {userId, connId, connAgentVersion, enableNtfs, lastExternalSndId = 0, deleted = False, ratchetSyncState = RSOk, pqSupport}
       withStore c $ \db -> createNewConn db g cData SCMInvitation
 
-joinConn :: AgentClient -> UserId -> ConnId -> Bool -> Bool -> ConnectionRequestUri c -> ConnInfo -> PQSupport -> SubscriptionMode -> AM (ConnId, SndQueueSecured)
-joinConn c userId connId hasNewConn enableNtfs cReq cInfo pqSupport subMode = do
-  srv <- case cReq of
-    CRInvitationUri ConnReqUriData {crSmpQueues = q :| _} _ ->
-      getNextServer c userId [qServer q]
-    _ -> getSMPServer c userId
-  joinConnSrv c userId connId hasNewConn enableNtfs cReq cInfo pqSupport subMode srv
+newConnToAccept :: AgentClient -> ConnId -> Bool -> ConfirmationId -> PQSupport -> AM ConnId
+newConnToAccept c connId enableNtfs invId pqSup = do
+  Invitation {connReq, contactConnId} <- withStore c $ \db -> getInvitation db "newConnToAccept" invId
+  withStore c (`getConn` contactConnId) >>= \case
+    SomeConn _ (ContactConnection ConnData {userId} _) ->
+      newConnToJoin c userId connId enableNtfs connReq pqSup
+    _ -> throwE $ CMD PROHIBITED "newConnToAccept"
 
-startJoinInvitation :: UserId -> ConnId -> Maybe SndQueue -> Bool -> ConnectionRequestUri 'CMInvitation -> PQSupport -> AM (ConnData, NewSndQueue, C.PublicKeyX25519, CR.Ratchet 'C.X448, CR.SndE2ERatchetParams 'C.X448)
-startJoinInvitation userId connId sq_ enableNtfs cReqUri pqSup =
+joinConn :: AgentClient -> UserId -> ConnId -> Bool -> ConnectionRequestUri c -> ConnInfo -> PQSupport -> SubscriptionMode -> AM SndQueueSecured
+joinConn c userId connId enableNtfs cReq cInfo pqSupport subMode = do
+  srv <- getNextSMPServer c userId [qServer cReqQueue]
+  joinConnSrv c userId connId enableNtfs cReq cInfo pqSupport subMode srv
+  where
+    cReqQueue :: SMPQueueUri
+    cReqQueue = case cReq of
+      CRInvitationUri ConnReqUriData {crSmpQueues = q :| _} _ -> q
+      CRContactUri ConnReqUriData {crSmpQueues = q :| _} -> q
+
+startJoinInvitation :: AgentClient -> UserId -> ConnId -> Maybe SndQueue -> Bool -> ConnectionRequestUri 'CMInvitation -> PQSupport -> AM (ConnData, SndQueue, CR.SndE2ERatchetParams 'C.X448)
+startJoinInvitation c userId connId sq_ enableNtfs cReqUri pqSup =
   lift (compatibleInvitationUri cReqUri) >>= \case
-    Just (qInfo, Compatible e2eRcvParams@(CR.E2ERatchetParams v _ rcDHRr kem_), Compatible connAgentVersion) -> do
-      g <- asks random
+    Just (qInfo, Compatible e2eRcvParams@(CR.E2ERatchetParams v _ _ _), Compatible connAgentVersion) -> do
+      -- this case avoids re-generating queue keys and subsequent failure of SKEY that timed out
+      -- e2ePubKey is always present, it's Maybe historically
       let pqSupport = pqSup `CR.pqSupportAnd` versionPQSupport_ connAgentVersion (Just v)
+      (sq', e2eSndParams) <- case sq_ of
+        Just sq@SndQueue {e2ePubKey = Just _k} -> do
+          e2eSndParams <-
+            withStore' c (\db -> getSndRatchet db connId v) >>= \case
+              Right r -> pure $ snd r
+              Left e -> do
+                atomically $ writeTBQueue (subQ c) ("", connId, AEvt SAEConn (ERR $ INTERNAL $ "no snd ratchet " <> show e))
+                createRatchet_ pqSupport e2eRcvParams
+          pure (sq, e2eSndParams)
+        _ -> do
+          q <- lift $ fst <$> newSndQueue userId "" qInfo
+          e2eSndParams <- createRatchet_ pqSupport e2eRcvParams
+          withStore c $ \db -> runExceptT $ do
+            sq' <- maybe (ExceptT $ updateNewConnSnd db connId q) pure sq_
+            pure (sq', e2eSndParams)
+      let cData = ConnData {userId, connId, connAgentVersion, enableNtfs, lastExternalSndId = 0, deleted = False, ratchetSyncState = RSOk, pqSupport}
+      pure (cData, sq', e2eSndParams)
+    Nothing -> throwE $ AGENT A_VERSION
+  where
+    createRatchet_ pqSupport e2eRcvParams@(CR.E2ERatchetParams v _ rcDHRr kem_) = do
+      g <- asks random
       (pk1, pk2, pKem, e2eSndParams) <- liftIO $ CR.generateSndE2EParams g v (CR.replyKEM_ v kem_ pqSupport)
       (_, rcDHRs) <- atomically $ C.generateKeyPair g
       rcParams <- liftEitherWith cryptoError $ CR.pqX3dhSnd pk1 pk2 pKem e2eRcvParams
       maxSupported <- asks $ maxVersion . e2eEncryptVRange . config
       let rcVs = CR.RatchetVersions {current = v, maxSupported}
           rc = CR.initSndRatchet rcVs rcDHRr rcDHRs rcParams
-      -- this case avoids re-generating queue keys and subsequent failure of SKEY that timed out
-      -- e2ePubKey is always present, it's Maybe historically
-      (q, e2ePubKey) <- case sq_ of
-        Just sq@SndQueue {e2ePubKey = Just k} -> pure ((sq :: SndQueue) {dbQueueId = DBNewQueue}, k)
-        _ -> lift $ newSndQueue userId "" qInfo
-      let cData = ConnData {userId, connId, connAgentVersion, enableNtfs, lastExternalSndId = 0, deleted = False, ratchetSyncState = RSOk, pqSupport}
-      pure (cData, q, e2ePubKey, rc, e2eSndParams)
-    Nothing -> throwE $ AGENT A_VERSION
+      withStore' c $ \db -> createSndRatchet db connId rc e2eSndParams
+      pure e2eSndParams
 
 connRequestPQSupport :: AgentClient -> PQSupport -> ConnectionRequestUri c -> IO (Maybe (VersionSMPA, PQSupport))
 connRequestPQSupport c pqSup cReq = withAgentEnv' c $ case cReq of
@@ -865,34 +901,26 @@ versionPQSupport_ :: VersionSMPA -> Maybe CR.VersionE2E -> PQSupport
 versionPQSupport_ agentV e2eV_ = PQSupport $ agentV >= pqdrSMPAgentVersion && maybe True (>= CR.pqRatchetE2EEncryptVersion) e2eV_
 {-# INLINE versionPQSupport_ #-}
 
-joinConnSrv :: AgentClient -> UserId -> ConnId -> Bool -> Bool -> ConnectionRequestUri c -> ConnInfo -> PQSupport -> SubscriptionMode -> SMPServerWithAuth -> AM (ConnId, SndQueueSecured)
-joinConnSrv c userId connId hasNewConn enableNtfs inv@CRInvitationUri {} cInfo pqSup subMode srv =
+joinConnSrv :: AgentClient -> UserId -> ConnId -> Bool -> ConnectionRequestUri c -> ConnInfo -> PQSupport -> SubscriptionMode -> SMPServerWithAuth -> AM SndQueueSecured
+joinConnSrv c userId connId enableNtfs inv@CRInvitationUri {} cInfo pqSup subMode srv =
   withInvLock c (strEncode inv) "joinConnSrv" $ do
-    (cData, q, _, rc, e2eSndParams) <- startJoinInvitation userId connId Nothing enableNtfs inv pqSup
-    g <- asks random
-    (connId', sq) <- withStore c $ \db -> runExceptT $ do
-      r@(connId', _) <-
-        if hasNewConn
-          then (connId,) <$> ExceptT (updateNewConnSnd db connId q)
-          else ExceptT $ createSndConn db g cData q
-      liftIO $ createRatchet db connId' rc
-      pure r
-    let cData' = (cData :: ConnData) {connId = connId'}
-    -- joinConnSrv is only used on user interaction, and its failure is permanent,
-    -- otherwise we would need to manage retries here to avoid SndQueue recreated with a different key,
-    -- similar to how joinConnAsync does that.
-    tryError (secureConfirmQueue c cData' sq srv cInfo (Just e2eSndParams) subMode) >>= \case
-      Right sqSecured -> pure (connId', sqSecured)
-      Left e -> do
-        -- possible improvement: recovery for failure on network timeout, see rfcs/2022-04-20-smp-conf-timeout-recovery.md
-        void $ withStore' c $ \db -> deleteConn db Nothing connId'
-        throwE e
-joinConnSrv c userId connId hasNewConn enableNtfs cReqUri@CRContactUri {} cInfo pqSup subMode srv =
+    SomeConn cType conn <- withStore c (`getConn` connId)
+    case conn of
+      NewConnection _ -> doJoin Nothing
+      SndConnection _ sq -> doJoin $ Just sq
+      DuplexConnection _ (RcvQueue {status = New} :| _) (sq@SndQueue {status = New} :| _) -> doJoin $ Just sq
+      _ -> throwE $ CMD PROHIBITED $ "joinConnSrv: bad connection " <> show cType
+  where
+    doJoin :: Maybe SndQueue -> AM SndQueueSecured
+    doJoin sq_ = do
+      (cData, sq, e2eSndParams) <- startJoinInvitation c userId connId sq_ enableNtfs inv pqSup
+      secureConfirmQueue c cData sq srv cInfo (Just e2eSndParams) subMode
+joinConnSrv c userId connId enableNtfs cReqUri@CRContactUri {} cInfo pqSup subMode srv =
   lift (compatibleContactUri cReqUri) >>= \case
     Just (qInfo, vrsn) -> do
-      (connId', cReq) <- newConnSrv c userId connId hasNewConn enableNtfs SCMInvitation Nothing (CR.IKNoPQ pqSup) subMode srv
-      void $ sendInvitation c userId qInfo vrsn cReq cInfo
-      pure (connId', False)
+      cReq <- newRcvConnSrv c userId connId enableNtfs SCMInvitation Nothing (CR.IKNoPQ pqSup) subMode srv
+      void $ sendInvitation c userId connId qInfo vrsn cReq cInfo
+      pure False
     Nothing -> throwE $ AGENT A_VERSION
 
 joinConnSrvAsync :: AgentClient -> UserId -> ConnId -> Bool -> ConnectionRequestUri c -> ConnInfo -> PQSupport -> SubscriptionMode -> SMPServerWithAuth -> AM SndQueueSecured
@@ -905,11 +933,8 @@ joinConnSrvAsync c userId connId enableNtfs inv@CRInvitationUri {} cInfo pqSuppo
   where
     doJoin :: Maybe SndQueue -> AM SndQueueSecured
     doJoin sq_ = do
-      (cData, sq, _, rc, e2eSndParams) <- startJoinInvitation userId connId sq_ enableNtfs inv pqSupport
-      sq' <- withStore c $ \db -> runExceptT $ do
-        liftIO $ createRatchet db connId rc
-        maybe (ExceptT $ updateNewConnSnd db connId sq) pure sq_
-      secureConfirmQueueAsync c cData sq' srv cInfo (Just e2eSndParams) subMode
+      (cData, sq, e2eSndParams) <- startJoinInvitation c userId connId sq_ enableNtfs inv pqSupport
+      secureConfirmQueueAsync c cData sq srv cInfo (Just e2eSndParams) subMode
 joinConnSrvAsync _c _userId _connId _enableNtfs (CRContactUri _) _cInfo _subMode _pqSupport _srv = do
   throwE $ CMD PROHIBITED "joinConnSrvAsync"
 
@@ -923,7 +948,7 @@ createReplyQueue c ConnData {userId, connId, enableNtfs} SndQueue {smpClientVers
   lift . when (subMode == SMSubscribe) $ addNewQueueSubscription c rq' tSess sessId
   when enableNtfs $ do
     ns <- asks ntfSupervisor
-    atomically $ sendNtfSubCommand ns (connId, NSCCreate)
+    atomically $ sendNtfSubCommand ns (NSCCreate, [connId])
   pure qInfo
 
 -- | Approve confirmation (LET command) in Reader monad
@@ -937,15 +962,14 @@ allowConnection' c connId confId ownConnInfo = withConnLock c connId "allowConne
     _ -> throwE $ CMD PROHIBITED "allowConnection"
 
 -- | Accept contact (ACPT command) in Reader monad
-acceptContact' :: AgentClient -> ConnId -> Bool -> InvitationId -> ConnInfo -> PQSupport -> SubscriptionMode -> AM (ConnId, SndQueueSecured)
+acceptContact' :: AgentClient -> ConnId -> Bool -> InvitationId -> ConnInfo -> PQSupport -> SubscriptionMode -> AM SndQueueSecured
 acceptContact' c connId enableNtfs invId ownConnInfo pqSupport subMode = withConnLock c connId "acceptContact" $ do
-  Invitation {contactConnId, connReq} <- withStore c (`getInvitation` invId)
+  Invitation {contactConnId, connReq} <- withStore c $ \db -> getInvitation db "acceptContact'" invId
   withStore c (`getConn` contactConnId) >>= \case
     SomeConn _ (ContactConnection ConnData {userId} _) -> do
+      sqSecured <- joinConn c userId connId enableNtfs connReq ownConnInfo pqSupport subMode
       withStore' c $ \db -> acceptInvitation db invId ownConnInfo
-      joinConn c userId connId False enableNtfs connReq ownConnInfo pqSupport subMode `catchAgentError` \err -> do
-        withStore' c (`unacceptInvitation` invId)
-        throwE err
+      pure sqSecured
     _ -> throwE $ CMD PROHIBITED "acceptContact"
 
 -- | Reject contact (RJCT command) in Reader monad
@@ -1013,14 +1037,13 @@ subscribeConnections' c connIds = do
         order _ = 4
     sendNtfCreate :: NtfSupervisor -> Map ConnId (Either AgentErrorType ()) -> Map ConnId SomeConn -> AM' ()
     sendNtfCreate ns rcvRs cs = do
-      -- TODO this needs to be batched end to end.
-      -- Currently, the only change is to ignore failed subscriptions.
       let oks = M.keysSet $ M.filter (either temporaryAgentError $ const True) rcvRs
-      forM_ (M.restrictKeys cs oks) $ \case
-        SomeConn _ conn -> do
-          let cmd = if enableNtfs $ toConnData conn then NSCCreate else NSCDelete
-              ConnData {connId} = toConnData conn
-          atomically $ writeTBQueue (ntfSubQ ns) (connId, cmd)            
+          cs' = M.restrictKeys cs oks
+          (csCreate, csDelete) = M.partition (\(SomeConn _ conn) -> enableNtfs $ toConnData conn) cs'
+      sendNtfCmd NSCCreate csCreate
+      sendNtfCmd NSCSmpDelete csDelete
+      where
+        sendNtfCmd cmd cs' = forM_ (L.nonEmpty $ M.keys cs') $ \cids -> atomically $ writeTBQueue (ntfSubQ ns) (cmd, cids)
     resumeDelivery :: Map ConnId SomeConn -> AM ()
     resumeDelivery conns = do
       conns' <- M.restrictKeys conns . S.fromList <$> withStore' c getConnectionsForDelivery
@@ -1049,28 +1072,57 @@ resubscribeConnections' c connIds = do
   -- union is left-biased, so results returned by subscribeConnections' take precedence
   (`M.union` r) <$> subscribeConnections' c connIds'
 
-getConnectionMessage' :: AgentClient -> ConnId -> AM (Maybe SMPMsgMeta)
-getConnectionMessage' c connId = do
-  whenM (atomically $ hasActiveSubscription c connId) . throwE $ CMD PROHIBITED "getConnectionMessage: subscribed"
-  SomeConn _ conn <- withStore c (`getConn` connId)
-  case conn of
-    DuplexConnection _ (rq :| _) _ -> getQueueMessage c rq
-    RcvConnection _ rq -> getQueueMessage c rq
-    ContactConnection _ rq -> getQueueMessage c rq
-    SndConnection _ _ -> throwE $ CONN SIMPLEX
-    NewConnection _ -> throwE $ CMD PROHIBITED "getConnectionMessage: NewConnection"
+getConnectionMessages' :: AgentClient -> NonEmpty ConnId -> AM' (NonEmpty (Maybe SMPMsgMeta))
+getConnectionMessages' c = mapM getMsg
+  where
+    getMsg :: ConnId -> AM' (Maybe SMPMsgMeta)
+    getMsg connId =
+      getConnectionMessage connId `catchAgentError'` \e -> do
+        logError $ "Error loading message: " <> tshow e
+        pure Nothing
+    getConnectionMessage :: ConnId -> AM (Maybe SMPMsgMeta)
+    getConnectionMessage connId = do
+      whenM (atomically $ hasActiveSubscription c connId) . throwE $ CMD PROHIBITED "getConnectionMessage: subscribed"
+      SomeConn _ conn <- withStore c (`getConn` connId)
+      case conn of
+        DuplexConnection _ (rq :| _) _ -> getQueueMessage c rq
+        RcvConnection _ rq -> getQueueMessage c rq
+        ContactConnection _ rq -> getQueueMessage c rq
+        SndConnection _ _ -> throwE $ CONN SIMPLEX
+        NewConnection _ -> throwE $ CMD PROHIBITED "getConnectionMessage: NewConnection"
 
-getNotificationMessage' :: AgentClient -> C.CbNonce -> ByteString -> AM (NotificationInfo, Maybe SMPMsgMeta)
-getNotificationMessage' c nonce encNtfInfo = do
+getNotificationConns' :: AgentClient -> C.CbNonce -> ByteString -> AM (NonEmpty NotificationInfo)
+getNotificationConns' c nonce encNtfInfo =
   withStore' c getActiveNtfToken >>= \case
     Just NtfToken {ntfDhSecret = Just dhSecret} -> do
-      ntfData <- agentCbDecrypt dhSecret nonce encNtfInfo
-      PNMessageData {smpQueue, ntfTs, nmsgNonce, encNMsgMeta} <- liftEither (parse strP (INTERNAL "error parsing PNMessageData") ntfData)
-      (ntfConnId, rcvNtfDhSecret) <- withStore c (`getNtfRcvQueue` smpQueue)
-      ntfMsgMeta <- (eitherToMaybe . smpDecode <$> agentCbDecrypt rcvNtfDhSecret nmsgNonce encNMsgMeta) `catchAgentError` \_ -> pure Nothing
-      msgMeta <- getConnectionMessage' c ntfConnId
-      pure (NotificationInfo {ntfConnId, ntfTs, ntfMsgMeta}, msgMeta)
-    _ -> throwE $ CMD PROHIBITED "getNotificationMessage"
+      ntfData <- liftEither $ agentCbDecrypt dhSecret nonce encNtfInfo
+      pnMsgs <- liftEither (parse pnMessagesP (INTERNAL "error parsing PNMessageData") ntfData)
+      let (initNtfs, lastNtf) = (L.init pnMsgs, L.last pnMsgs)
+      rs <-
+        lift $ withStoreBatch c $ \db ->
+          let initNtfInfos = map (getInitNtfInfo db) initNtfs
+              lastNtfInfo = Just . fst <$$> getNtfInfo db lastNtf
+           in initNtfInfos <> [lastNtfInfo]
+      let (errs, ntfInfos_) = partitionEithers rs
+      logError $ "Error(s) loading notifications: " <> tshow errs
+      case L.nonEmpty $ catMaybes ntfInfos_ of
+        Just r -> pure r
+        Nothing -> throwE $ INTERNAL "getNotificationConns: couldn't get conn info"
+    _ -> throwE $ CMD PROHIBITED "getNotificationConns"
+  where
+    getNtfInfo :: DB.Connection -> PNMessageData -> IO (Either AgentErrorType (NotificationInfo, Maybe UTCTime))
+    getNtfInfo db PNMessageData {smpQueue, ntfTs, nmsgNonce, encNMsgMeta} = runExceptT $ do
+      (ntfConnId, rcvNtfDhSecret, lastBrokerTs_) <- liftError' storeError $ getNtfRcvQueue db smpQueue
+      let ntfMsgMeta = eitherToMaybe $ smpDecode =<< first show (C.cbDecrypt rcvNtfDhSecret nmsgNonce encNMsgMeta)
+          ntfInfo = NotificationInfo {ntfConnId, ntfTs, ntfMsgMeta}
+      pure (ntfInfo, lastBrokerTs_)
+    getInitNtfInfo :: DB.Connection -> PNMessageData -> IO (Either AgentErrorType (Maybe NotificationInfo))
+    getInitNtfInfo db msgData = runExceptT $ do
+      (nftInfo, lastBrokerTs_) <- ExceptT $ getNtfInfo db msgData
+      pure $ case (ntfMsgMeta nftInfo, lastBrokerTs_) of
+        (Just SMP.NMsgMeta {msgTs}, Just lastBrokerTs)
+          | systemToUTCTime msgTs > lastBrokerTs -> Just nftInfo
+        _ -> Nothing
 
 -- | Send message to the connection (SEND command) in Reader monad
 sendMessage' :: AgentClient -> ConnId -> PQEncryption -> MsgFlags -> MsgBody -> AM (AgentMsgId, PQEncryption)
@@ -1103,8 +1155,8 @@ sendMessagesB_ c reqs connIds = withConnLocks c connIds "sendMessages" $ do
   where
     getConn_ :: DB.Connection -> TVar (Maybe (Either AgentErrorType SomeConn)) -> MsgReq -> IO (Either AgentErrorType (MsgReq, SomeConn))
     getConn_ db prev req@(connId, _, _, _) =
-      (req,) <$$> 
-        if B.null connId
+      (req,)
+        <$$> if B.null connId
           then fromMaybe (Left $ INTERNAL "sendMessagesB_: empty prev connId") <$> readTVarIO prev
           else do
             conn <- first storeError <$> getConn db connId
@@ -1168,14 +1220,13 @@ runCommandProcessing c@AgentClient {subQ} connId server_ Worker {doWork} = do
     processCmd ri PendingCommand {cmdId, corrId, userId, command} pendingCmds = case command of
       AClientCommand cmd -> case cmd of
         NEW enableNtfs (ACM cMode) pqEnc subMode -> noServer $ do
-          usedSrvs <- newTVarIO ([] :: [SMPServer])
-          tryCommand . withNextSrv c userId usedSrvs [] $ \srv -> do
-            (_, cReq) <- newRcvConnSrv c userId connId enableNtfs cMode Nothing pqEnc subMode srv
+          triedHosts <- newTVarIO S.empty
+          tryCommand . withNextSrv c userId storageSrvs triedHosts [] $ \srv -> do
+            cReq <- newRcvConnSrv c userId connId enableNtfs cMode Nothing pqEnc subMode srv
             notify $ INV (ACR cMode cReq)
         JOIN enableNtfs (ACR _ cReq@(CRInvitationUri ConnReqUriData {crSmpQueues = q :| _} _)) pqEnc subMode connInfo -> noServer $ do
-          let initUsed = [qServer q]
-          usedSrvs <- newTVarIO initUsed
-          tryCommand . withNextSrv c userId usedSrvs initUsed $ \srv -> do
+          triedHosts <- newTVarIO S.empty
+          tryCommand . withNextSrv c userId storageSrvs triedHosts [qServer q] $ \srv -> do
             sqSecured <- joinConnSrvAsync c userId connId enableNtfs cReq connInfo pqEnc subMode srv
             notify $ JOINED sqSecured
         LET confId ownCInfo -> withServer' . tryCommand $ allowConnection' c connId confId ownCInfo >> notify OK
@@ -1258,7 +1309,7 @@ runCommandProcessing c@AgentClient {subQ} connId server_ Worker {doWork} = do
                     withStore' c $ \db -> deleteConnRcvQueue db rq'
                     when (enableNtfs cData) $ do
                       ns <- asks ntfSupervisor
-                      atomically $ sendNtfSubCommand ns (connId, NSCCreate)
+                      atomically $ sendNtfSubCommand ns (NSCCreate, [connId])
                     let conn' = DuplexConnection cData (rq'' :| rqs') sqs
                     notify $ SWITCH QDRcv SPCompleted $ connectionStats conn'
               _ -> internalErr "ICQDelete: cannot delete the only queue in connection"
@@ -1343,7 +1394,7 @@ enqueueMessageB c reqs = do
     storeSentMsg db cfg req@(cData@ConnData {connId}, sq :| _, pqEnc_, msgFlags, aMessage) = fmap (first storeError) $ runExceptT $ do
       let AgentConfig {smpAgentVRange, e2eEncryptVRange} = cfg
       internalTs <- liftIO getCurrentTime
-      (internalId, internalSndId, prevMsgHash) <- liftIO $ updateSndIds db connId
+      (internalId, internalSndId, prevMsgHash) <- ExceptT $ updateSndIds db connId
       let privHeader = APrivHeader (unSndId internalSndId) prevMsgHash
           agentMsg = AgentMessage privHeader aMessage
           agentMsgStr = smpEncode agentMsg
@@ -1623,8 +1674,8 @@ switchDuplexConnection c (DuplexConnection cData@ConnData {connId, userId} rqs s
   checkRQSwchStatus rq RSSwitchStarted
   clientVRange <- asks $ smpClientVRange . config
   -- try to get the server that is different from all queues, or at least from the primary rcv queue
-  srvAuth@(ProtoServerWithAuth srv _) <- getNextServer c userId $ map qServer (L.toList rqs) <> map qServer (L.toList sqs)
-  srv' <- if srv == server then getNextServer c userId [server] else pure srvAuth
+  srvAuth@(ProtoServerWithAuth srv _) <- getNextSMPServer c userId $ map qServer (L.toList rqs) <> map qServer (L.toList sqs)
+  srv' <- if srv == server then getNextSMPServer c userId [server] else pure srvAuth
   (q, qUri, tSess, sessId) <- newRcvQueue c userId connId srv' clientVRange SMSubscribe False
   let rq' = (q :: NewRcvQueue) {primary = True, dbReplaceQueueId = Just dbQueueId}
   rq'' <- withStore c $ \db -> addConnRcvQueue db connId rq'
@@ -1680,14 +1731,21 @@ synchronizeRatchet' c connId pqSupport' force = withConnLock c connId "synchroni
     _ -> throwE $ CMD PROHIBITED "synchronizeRatchet: not duplex"
 
 ackQueueMessage :: AgentClient -> RcvQueue -> SMP.MsgId -> AM ()
-ackQueueMessage c rq@RcvQueue {userId, server} srvMsgId = do
+ackQueueMessage c rq@RcvQueue {userId, connId, server} srvMsgId = do
   atomically $ incSMPServerStat c userId server ackAttempts
   tryAgentError (sendAck c rq srvMsgId) >>= \case
-    Right _ -> atomically $ incSMPServerStat c userId server ackMsgs
-    Left (SMP _ SMP.NO_MSG) -> atomically $ incSMPServerStat c userId server ackNoMsgErrs
+    Right _ -> sendMsgNtf ackMsgs
+    Left (SMP _ SMP.NO_MSG) -> sendMsgNtf ackNoMsgErrs
     Left e -> do
       unless (temporaryOrHostError e) $ atomically $ incSMPServerStat c userId server ackOtherErrs
       throwE e
+  where
+    sendMsgNtf stat = do
+      atomically $ incSMPServerStat c userId server stat
+      whenM (liftIO $ hasGetLock c rq) $ do
+        atomically $ releaseGetLock c rq
+        brokerTs_ <- eitherToMaybe <$> tryAgentError (withStore c $ \db -> getRcvMsgBrokerTs db connId srvMsgId)
+        atomically $ writeTBQueue (subQ c) ("", connId, AEvt SAEConn $ MSGNTF srvMsgId brokerTs_)
 
 -- | Suspend SMP agent connection (OFF command) in Reader monad
 suspendConnection' :: AgentClient -> ConnId -> AM ()
@@ -1715,12 +1773,6 @@ connRcvQueues = \case
   SndConnection _ _ -> []
   NewConnection _ -> []
 
-disableConn :: AgentClient -> ConnId -> AM' ()
-disableConn c connId = do
-  atomically $ removeSubscription c connId
-  ns <- asks ntfSupervisor
-  atomically $ writeTBQueue (ntfSubQ ns) (connId, NSCDelete)
-
 -- Unlike deleteConnectionsAsync, this function does not mark connections as deleted in case of deletion failure.
 deleteConnections' :: AgentClient -> [ConnId] -> AM (Map ConnId (Either AgentErrorType ()))
 deleteConnections' = deleteConnections_ getConns False False
@@ -1747,20 +1799,26 @@ prepareDeleteConnections_ getConnections c waitDelivery connIds = do
       (delRs, rcvQs) = M.mapEither rcvQueues cs
       rqs = concat $ M.elems rcvQs
       connIds' = M.keys rcvQs
-  lift . forM_ connIds' $ disableConn c
+  lift $ forM_ (L.nonEmpty connIds') unsubConnIds
   -- ! delRs is not used to notify about the result in any of the calling functions,
   -- ! it is only used to check results count in deleteConnections_;
   -- ! if it was used to notify about the result, it might be necessary to differentiate
   -- ! between completed deletions of connections, and deletions delayed due to wait for delivery (see deleteConn)
   deliveryTimeout <- if waitDelivery then asks (Just . connDeleteDeliveryTimeout . config) else pure Nothing
-  rs' <- lift $ catMaybes . rights <$> withStoreBatch' c (\db -> map (deleteConn db deliveryTimeout) (M.keys delRs))
-  forM_ rs' $ \cId -> notify ("", cId, AEvt SAEConn DEL_CONN)
+  cIds_ <- lift $ L.nonEmpty . catMaybes . rights <$> withStoreBatch' c (\db -> map (deleteConn db deliveryTimeout) (M.keys delRs))
+  forM_ cIds_ $ \cIds -> notify ("", "", AEvt SAEConn $ DEL_CONNS cIds)
   pure (errs' <> delRs, rqs, connIds')
   where
     rcvQueues :: SomeConn -> Either (Either AgentErrorType ()) [RcvQueue]
     rcvQueues (SomeConn _ conn) = case connRcvQueues conn of
       [] -> Left $ Right ()
       rqs -> Right rqs
+    unsubConnIds :: NonEmpty ConnId -> AM' ()
+    unsubConnIds connIds' = do
+      forM_ connIds' $ \connId ->
+        atomically $ removeSubscription c connId
+      ns <- asks ntfSupervisor
+      atomically $ writeTBQueue (ntfSubQ ns) (NSCDeleteSub, connIds')
     notify = atomically . writeTBQueue (subQ c)
 
 deleteConnQueues :: AgentClient -> Bool -> Bool -> [RcvQueue] -> AM' (Map ConnId (Either AgentErrorType ()))
@@ -1768,32 +1826,33 @@ deleteConnQueues c waitDelivery ntf rqs = do
   rs <- connResults <$> (deleteQueueRecs =<< deleteQueues c rqs)
   let connIds = M.keys $ M.filter isRight rs
   deliveryTimeout <- if waitDelivery then asks (Just . connDeleteDeliveryTimeout . config) else pure Nothing
-  rs' <- catMaybes . rights <$> withStoreBatch' c (\db -> map (deleteConn db deliveryTimeout) connIds)
-  forM_ rs' $ \cId -> notify ("", cId, AEvt SAEConn DEL_CONN)
+  cIds_ <- L.nonEmpty . catMaybes . rights <$> withStoreBatch' c (\db -> map (deleteConn db deliveryTimeout) connIds)
+  forM_ cIds_ $ \cIds -> notify ("", "", AEvt SAEConn $ DEL_CONNS cIds)
   pure rs
   where
     deleteQueueRecs :: [(RcvQueue, Either AgentErrorType ())] -> AM' [(RcvQueue, Either AgentErrorType ())]
     deleteQueueRecs rs = do
       maxErrs <- asks $ deleteErrorCount . config
-      (rs', notifyActions) <- unzip . rights <$> withStoreBatch' c (\db -> map (deleteQueueRec db maxErrs) rs)
-      mapM_ sequence_ notifyActions
-      pure rs'
+      rs' <- rights <$> withStoreBatch' c (\db -> map (deleteQueueRec db maxErrs) rs)
+      let delQ ((rq, _), err_) =  (qConnId rq,qServer rq,queueId rq,) <$> err_
+          delQs_ = L.nonEmpty $ mapMaybe delQ rs'
+      forM_ delQs_ $ \delQs -> notify ("", "", AEvt SAEConn $ DEL_RCVQS delQs)
+      pure $ map fst rs'
       where
         deleteQueueRec ::
           DB.Connection ->
           Int ->
           (RcvQueue, Either AgentErrorType ()) ->
-          IO ((RcvQueue, Either AgentErrorType ()), Maybe (AM' ()))
+          IO ((RcvQueue, Either AgentErrorType ()), Maybe (Maybe AgentErrorType)) -- Nothing - no event, Just Nothing - no error
         deleteQueueRec db maxErrs (rq@RcvQueue {userId, server}, r) = case r of
-          Right _ -> deleteConnRcvQueue db rq $> ((rq, r), Just (notifyRQ rq Nothing))
+          Right _ -> deleteConnRcvQueue db rq $> ((rq, r), Just Nothing)
           Left e
             | temporaryOrHostError e && deleteErrors rq + 1 < maxErrs -> incRcvDeleteErrors db rq $> ((rq, r), Nothing)
             | otherwise -> do
                 deleteConnRcvQueue db rq
                 -- attempts and successes are counted in deleteQueues function
                 atomically $ incSMPServerStat c userId server connDeleted
-                pure ((rq, Right ()), Just (notifyRQ rq (Just e)))
-    notifyRQ rq e_ = notify ("", qConnId rq, AEvt SAEConn $ DEL_RCVQ (qServer rq) (queueId rq) e_)
+                pure ((rq, Right ()), Just (Just e))
     notify = when ntf . atomically . writeTBQueue (subQ c)
     connResults :: [(RcvQueue, Either AgentErrorType ())] -> Map ConnId (Either AgentErrorType ())
     connResults = M.map snd . foldl' addResult M.empty
@@ -1901,16 +1960,12 @@ registerNtfToken' c suppliedDeviceToken suppliedNtfMode =
                 cron <- asks $ ntfCron . config
                 agentNtfEnableCron c tknId tkn cron
                 when (suppliedNtfMode == NMInstant) $ initializeNtfSubs c
-                when (suppliedNtfMode == NMPeriodic && savedNtfMode == NMInstant) $ deleteNtfSubs c NSCDelete
+                when (suppliedNtfMode == NMPeriodic && savedNtfMode == NMInstant) $ deleteNtfSubs c NSCSmpDelete
               -- possible improvement: get updated token status from the server, or maybe TCRON could return the current status
               pure ntfTknStatus
           | otherwise -> replaceToken tknId
-        (Just tknId, Just NTADelete) -> do
-          agentNtfDeleteToken c tknId tkn
-          withStore' c (`removeNtfToken` tkn)
-          ns <- asks ntfSupervisor
-          atomically $ nsRemoveNtfToken ns
-          pure NTExpired
+        -- deprecated
+        (Just _tknId, Just NTADelete) -> deleteToken c tkn $> NTExpired
         _ -> pure ntfTknStatus
       withStore' c $ \db -> updateNtfMode db tkn suppliedNtfMode
       pure status
@@ -1983,8 +2038,8 @@ deleteNtfToken' :: AgentClient -> DeviceToken -> AM ()
 deleteNtfToken' c deviceToken =
   withStore' c getSavedNtfToken >>= \case
     Just tkn@NtfToken {deviceToken = savedDeviceToken} -> do
-      when (deviceToken /= savedDeviceToken) . throwE $ CMD PROHIBITED "deleteNtfToken: different token"
-      deleteToken_ c tkn
+      when (deviceToken /= savedDeviceToken) $ logWarn "deleteNtfToken: different token"
+      deleteToken c tkn
       deleteNtfSubs c NSCSmpDelete
     _ -> throwE $ CMD PROHIBITED "deleteNtfToken: no token"
 
@@ -2016,21 +2071,8 @@ toggleConnectionNtfs' c connId enable = do
       | otherwise = do
           withStore' c $ \db -> setConnectionNtfs db connId enable
           ns <- asks ntfSupervisor
-          let cmd = if enable then NSCCreate else NSCDelete
-          atomically $ sendNtfSubCommand ns (connId, cmd)
-
-deleteToken_ :: AgentClient -> NtfToken -> AM ()
-deleteToken_ c tkn@NtfToken {ntfTokenId, ntfTknStatus} = do
-  ns <- asks ntfSupervisor
-  forM_ ntfTokenId $ \tknId -> do
-    let ntfTknAction = Just NTADelete
-    withStore' c $ \db -> updateNtfToken db tkn ntfTknStatus ntfTknAction
-    atomically $ nsUpdateToken ns tkn {ntfTknStatus, ntfTknAction}
-    agentNtfDeleteToken c tknId tkn `catchAgentError` \case
-      NTF _ AUTH -> pure ()
-      e -> throwE e
-  withStore' c $ \db -> removeNtfToken db tkn
-  atomically $ nsRemoveNtfToken ns
+          let cmd = if enable then NSCCreate else NSCSmpDelete
+          atomically $ sendNtfSubCommand ns (cmd, [connId])
 
 withToken :: AgentClient -> NtfToken -> Maybe (NtfTknStatus, NtfTknAction) -> (NtfTknStatus, Maybe NtfTknAction) -> AM a -> AM NtfTknStatus
 withToken c tkn@NtfToken {deviceToken, ntfMode} from_ (toStatus, toAction_) f = do
@@ -2064,13 +2106,24 @@ deleteNtfSubs c deleteCmd = do
 sendNtfConnCommands :: AgentClient -> NtfSupervisorCommand -> AM ()
 sendNtfConnCommands c cmd = do
   ns <- asks ntfSupervisor
-  connIds <- liftIO $ getSubscriptions c
-  forM_ connIds $ \connId -> do
-    withStore' c (`getConnData` connId) >>= \case
-      Just (ConnData {enableNtfs}, _) ->
-        when enableNtfs . atomically $ writeTBQueue (ntfSubQ ns) (connId, cmd)
-      _ ->
-        atomically $ writeTBQueue (subQ c) ("", connId, AEvt SAEConn $ ERR $ INTERNAL "no connection data")
+  connIds <- liftIO $ S.toList <$> getSubscriptions c
+  rs <- lift $ withStoreBatch' c (\db -> map (getConnData db) connIds)
+  let (connIds', cErrs) = enabledNtfConns (zip connIds rs)
+  forM_ (L.nonEmpty connIds') $ \connIds'' ->
+    atomically $ writeTBQueue (ntfSubQ ns) (cmd, connIds'')
+  unless (null cErrs) $ atomically $ writeTBQueue (subQ c) ("", "", AEvt SAENone $ ERRS cErrs)
+  where
+    enabledNtfConns :: [(ConnId, Either AgentErrorType (Maybe (ConnData, ConnectionMode)))] -> ([ConnId], [(ConnId, AgentErrorType)])
+    enabledNtfConns = foldr addEnabledConn ([], [])
+      where
+        addEnabledConn ::
+          (ConnId, Either AgentErrorType (Maybe (ConnData, ConnectionMode))) ->
+          ([ConnId], [(ConnId, AgentErrorType)]) ->
+          ([ConnId], [(ConnId, AgentErrorType)])
+        addEnabledConn cData_ (cIds, errs) = case cData_ of
+          (_, Right (Just (ConnData {connId, enableNtfs}, _))) -> if enableNtfs then (connId : cIds, errs) else (cIds, errs)
+          (connId, Right Nothing) -> (cIds, (connId, INTERNAL "no connection data") : errs)
+          (connId, Left e) -> (cIds, (connId, e) : errs)
 
 setNtfServers :: AgentClient -> [NtfServer] -> IO ()
 setNtfServers c = atomically . writeTVar (ntfServers c)
@@ -2119,7 +2172,7 @@ execAgentStoreSQL :: AgentClient -> Text -> AE [Text]
 execAgentStoreSQL c sql = withAgentEnv c $ withStore' c (`execSQL` sql)
 
 getAgentMigrations :: AgentClient -> AE [UpMigration]
-getAgentMigrations c = withAgentEnv c $ map upMigration <$> withStore' c (Migrations.getCurrent . DB.conn)
+getAgentMigrations c = withAgentEnv c $ map upMigration <$> withStore' c Migrations.getCurrent
 
 debugAgentLocks :: AgentClient -> IO AgentLocks
 debugAgentLocks AgentClient {connLocks = cs, invLocks = is, deleteLock = d} = do
@@ -2131,9 +2184,13 @@ debugAgentLocks AgentClient {connLocks = cs, invLocks = is, deleteLock = d} = do
     getLocks ls = atomically $ M.mapKeys (B.unpack . strEncode) . M.mapMaybe id <$> (mapM tryReadTMVar =<< readTVar ls)
 
 getSMPServer :: AgentClient -> UserId -> AM SMPServerWithAuth
-getSMPServer c userId = withUserServers c userId pickServer
+getSMPServer c userId = getNextSMPServer c userId []
 {-# INLINE getSMPServer #-}
 
+getNextSMPServer :: AgentClient -> UserId -> [SMPServer] -> AM SMPServerWithAuth
+getNextSMPServer c userId = getNextServer c userId storageSrvs
+{-# INLINE getNextSMPServer #-}
+
 subscriber :: AgentClient -> AM' ()
 subscriber c@AgentClient {msgQ} = forever $ do
   t <- atomically $ readTBQueue msgQ
@@ -2151,6 +2208,7 @@ cleanupManager c@AgentClient {subQ} = do
     run ERR $ withStore' c (`deleteRcvMsgHashesExpired` ttl)
     run ERR $ withStore' c (`deleteSndMsgsExpired` ttl)
     run ERR $ withStore' c (`deleteRatchetKeyHashesExpired` ttl)
+    run ERR $ withStore' c (`deleteExpiredNtfTokensToDelete` ttl)
     run RFERR deleteRcvFilesExpired
     run RFERR deleteRcvFilesDeleted
     run RFERR deleteRcvFilesTmpPaths
@@ -2208,7 +2266,7 @@ cleanupManager c@AgentClient {subQ} = do
     deleteExpiredReplicasForDeletion = do
       rcvFilesTTL <- asks $ rcvFilesTTL . config
       withStore' c (`deleteDeletedSndChunkReplicasExpired` rcvFilesTTL)
-    notify :: forall e. AEntityI e => EntityId -> AEvent e -> AM ()
+    notify :: forall e. AEntityI e => AEntityId -> AEvent e -> AM ()
     notify entId cmd = atomically $ writeTBQueue subQ ("", entId, AEvt (sAEntity @e) cmd)
 
 data ACKd = ACKd | ACKPending
@@ -2289,12 +2347,9 @@ processSMPTransmissions c@AgentClient {subQ} (tSess@(userId, srv, _), _v, sessId
             atomically $ incSMPServerStat c userId srv recvMsgs
             void . handleNotifyAck $ do
               msg' <- decryptSMPMessage rq msg
-              ack' <- handleNotifyAck $ case msg' of
+              handleNotifyAck $ case msg' of
                 SMP.ClientRcvMsgBody {msgTs = srvTs, msgFlags, msgBody} -> processClientMsg srvTs msgFlags msgBody
                 SMP.ClientRcvMsgQuota {} -> queueDrained >> ack
-              whenM (liftIO $ hasGetLock c rq) $
-                notify (MSGNTF $ SMP.rcvMessageMeta srvMsgId msg')
-              pure ack'
             where
               queueDrained = case conn of
                 DuplexConnection _ _ sqs -> void $ enqueueMessages c cData sqs SMP.noMsgFlags $ A_QCONT (sndAddress rq)
@@ -2345,7 +2400,7 @@ processSMPTransmissions c@AgentClient {subQ} (tSess@(userId, srv, _), _v, sessId
                               HELLO -> helloMsg srvMsgId msgMeta conn'' >> ackDel msgId
                               -- note that there is no ACK sent for A_MSG, it is sent with agent's user ACK command
                               A_MSG body -> do
-                                logServer "<--" c srv rId $ "MSG <MSG>:" <> logSecret srvMsgId
+                                logServer "<--" c srv rId $ "MSG <MSG>:" <> logSecret' srvMsgId
                                 notify $ MSG msgMeta msgFlags body
                                 pure ACKPending
                               A_RCVD rcpts -> qDuplex conn'' "RCVD" $ messagesRcvd rcpts msgMeta
@@ -2355,7 +2410,7 @@ processSMPTransmissions c@AgentClient {subQ} (tSess@(userId, srv, _), _v, sessId
                               QUSE qs -> qDuplexAckDel conn'' "QUSE" $ qUseMsg srvMsgId qs
                               -- no action needed for QTEST
                               -- any message in the new queue will mark it active and trigger deletion of the old queue
-                              QTEST _ -> logServer "<--" c srv rId ("MSG <QTEST>:" <> logSecret srvMsgId) >> ackDel msgId
+                              QTEST _ -> logServer "<--" c srv rId ("MSG <QTEST>:" <> logSecret' srvMsgId) >> ackDel msgId
                               EREADY _ -> qDuplexAckDel conn'' "EREADY" $ ereadyMsg rcPrev
                             where
                               qDuplexAckDel :: Connection c -> String -> (Connection 'CDuplex -> AM ()) -> AM ACKd
@@ -2378,7 +2433,7 @@ processSMPTransmissions c@AgentClient {subQ} (tSess@(userId, srv, _), _v, sessId
                                 | otherwise ->
                                     liftEither (parse smpP (AGENT A_MESSAGE) agentMsgBody) >>= \case
                                       AgentMessage _ (A_MSG body) -> do
-                                        logServer "<--" c srv rId $ "MSG <MSG>:" <> logSecret srvMsgId
+                                        logServer "<--" c srv rId $ "MSG <MSG>:" <> logSecret' srvMsgId
                                         notify $ MSG msgMeta msgFlags body
                                         pure ACKPending
                                       _ -> ack
@@ -2449,17 +2504,14 @@ processSMPTransmissions c@AgentClient {subQ} (tSess@(userId, srv, _), _v, sessId
               handleNotifyAck :: AM ACKd -> AM ACKd
               handleNotifyAck m = m `catchAgentError` \e -> notify (ERR e) >> ack
           SMP.END ->
-            atomically (TM.lookup tSess (smpClients c) $>>= (tryReadTMVar . sessionVar) >>= processEND)
+            atomically (ifM (activeClientSession c tSess sessId) (removeSubscription c connId $> True) (pure False))
               >>= notifyEnd
             where
-              processEND = \case
-                Just (Right clnt)
-                  | sessId == sessionId (thParams $ connectedClient clnt) ->
-                      removeSubscription c connId $> True
-                _ -> pure False
               notifyEnd removed
                 | removed = notify END >> logServer "<--" c srv rId "END"
                 | otherwise = logServer "<--" c srv rId "END from disconnected client - ignored"
+          -- Possibly, we need to add some flag to connection that it was deleted
+          SMP.DELD -> atomically (removeSubscription c connId) >> notify DELD
           SMP.ERR e -> notify $ ERR $ SMP (B.unpack $ strEncode srv) e
           r -> unexpected r
         where
@@ -2484,7 +2536,7 @@ processSMPTransmissions c@AgentClient {subQ} (tSess@(userId, srv, _), _v, sessId
 
           decryptClientMessage :: C.DhSecretX25519 -> SMP.ClientMsgEnvelope -> AM (SMP.PrivHeader, AgentMsgEnvelope)
           decryptClientMessage e2eDh SMP.ClientMsgEnvelope {cmNonce, cmEncBody} = do
-            clientMsg <- agentCbDecrypt e2eDh cmNonce cmEncBody
+            clientMsg <- liftEither $ agentCbDecrypt e2eDh cmNonce cmEncBody
             SMP.ClientMessage privHeader clientBody <- parseMessage clientMsg
             agentEnvelope <- parseMessage clientBody
             -- Version check is removed here, because when connecting via v1 contact address the agent still sends v2 message,
@@ -2500,7 +2552,7 @@ processSMPTransmissions c@AgentClient {subQ} (tSess@(userId, srv, _), _v, sessId
 
           smpConfirmation :: SMP.MsgId -> Connection c -> Maybe C.APublicAuthKey -> C.PublicKeyX25519 -> Maybe (CR.SndE2ERatchetParams 'C.X448) -> ByteString -> VersionSMPC -> VersionSMPA -> AM ()
           smpConfirmation srvMsgId conn' senderKey e2ePubKey e2eEncryption encConnInfo smpClientVersion agentVersion = do
-            logServer "<--" c srv rId $ "MSG <CONF>:" <> logSecret srvMsgId
+            logServer "<--" c srv rId $ "MSG <CONF>:" <> logSecret' srvMsgId
             AgentConfig {smpClientVRange, smpAgentVRange, e2eEncryptVRange} <- asks config
             let ConnData {pqSupport} = toConnData conn'
             unless
@@ -2569,7 +2621,7 @@ processSMPTransmissions c@AgentClient {subQ} (tSess@(userId, srv, _), _v, sessId
 
           helloMsg :: SMP.MsgId -> MsgMeta -> Connection c -> AM ()
           helloMsg srvMsgId MsgMeta {pqEncryption} conn' = do
-            logServer "<--" c srv rId $ "MSG <HELLO>:" <> logSecret srvMsgId
+            logServer "<--" c srv rId $ "MSG <HELLO>:" <> logSecret' srvMsgId
             case status of
               Active -> prohibited "hello: active"
               _ ->
@@ -2593,7 +2645,7 @@ processSMPTransmissions c@AgentClient {subQ} (tSess@(userId, srv, _), _v, sessId
           continueSending srvMsgId addr (DuplexConnection _ _ sqs) =
             case findQ addr sqs of
               Just sq -> do
-                logServer "<--" c srv rId $ "MSG <QCONT>:" <> logSecret srvMsgId
+                logServer "<--" c srv rId $ "MSG <QCONT>:" <> logSecret' srvMsgId
                 atomically $
                   TM.lookup (qAddress sq) (smpDeliveryWorkers c)
                     >>= mapM_ (\(_, retryLock) -> tryPutTMVar retryLock ())
@@ -2602,7 +2654,7 @@ processSMPTransmissions c@AgentClient {subQ} (tSess@(userId, srv, _), _v, sessId
 
           messagesRcvd :: NonEmpty AMessageReceipt -> MsgMeta -> Connection 'CDuplex -> AM ACKd
           messagesRcvd rcpts msgMeta@MsgMeta {broker = (srvMsgId, _)} _ = do
-            logServer "<--" c srv rId $ "MSG <RCPT>:" <> logSecret srvMsgId
+            logServer "<--" c srv rId $ "MSG <RCPT>:" <> logSecret' srvMsgId
             rs <- forM rcpts $ \rcpt -> clientReceipt rcpt `catchAgentError` \e -> notify (ERR e) $> Nothing
             case L.nonEmpty . catMaybes $ L.toList rs of
               Just rs' -> notify (RCVD msgMeta rs') $> ACKPending
@@ -2642,7 +2694,7 @@ processSMPTransmissions c@AgentClient {subQ} (tSess@(userId, srv, _), _v, sessId
                         sq2 <- withStore c $ \db -> do
                           liftIO $ mapM_ (deleteConnSndQueue db connId) delSqs
                           addConnSndQueue db connId (sq_ :: NewSndQueue) {primary = True, dbReplaceQueueId = Just dbQueueId}
-                        logServer "<--" c srv rId $ "MSG <QADD>:" <> logSecret srvMsgId <> " " <> logSecret (senderId queueAddress)
+                        logServer "<--" c srv rId $ "MSG <QADD>:" <> logSecret' srvMsgId <> " " <> logSecret (senderId queueAddress)
                         let sqInfo' = (sqInfo :: SMPQueueInfo) {queueAddress = queueAddress {dhPublicKey}}
                         void . enqueueMessages c cData' sqs SMP.noMsgFlags $ QKEY [(sqInfo', sndPublicKey)]
                         sq1 <- withStore' c $ \db -> setSndSwitchStatus db sq $ Just SSSendingQKEY
@@ -2663,7 +2715,7 @@ processSMPTransmissions c@AgentClient {subQ} (tSess@(userId, srv, _), _v, sessId
               Just rq'@RcvQueue {rcvId, e2ePrivKey = dhPrivKey, smpClientVersion = cVer, status = status'}
                 | status' == New || status' == Confirmed -> do
                     checkRQSwchStatus rq RSSendingQADD
-                    logServer "<--" c srv rId $ "MSG <QKEY>:" <> logSecret srvMsgId <> " " <> logSecret senderId
+                    logServer "<--" c srv rId $ "MSG <QKEY>:" <> logSecret' srvMsgId <> " " <> logSecret senderId
                     let dhSecret = C.dh' dhPublicKey dhPrivKey
                     withStore' c $ \db -> setRcvQueueConfirmedE2E db rq' dhSecret $ min cVer cVer'
                     enqueueCommand c "" connId (Just smpServer) $ AInternalCommand $ ICQSecure rcvId senderKey
@@ -2684,7 +2736,7 @@ processSMPTransmissions c@AgentClient {subQ} (tSess@(userId, srv, _), _v, sessId
                 case find ((replaceQId ==) . dbQId) sqs of
                   Just sq1 -> do
                     checkSQSwchStatus sq1 SSSendingQKEY
-                    logServer "<--" c srv rId $ "MSG <QUSE>:" <> logSecret srvMsgId <> " " <> logSecret (snd addr)
+                    logServer "<--" c srv rId $ "MSG <QUSE>:" <> logSecret' srvMsgId <> " " <> logSecret (snd addr)
                     withStore' c $ \db -> setSndQueueStatus db sq' Secured
                     let sq'' = (sq' :: SndQueue) {status = Secured}
                     -- sending QTEST to the new queue only, the old one will be removed if sent successfully
@@ -2708,7 +2760,7 @@ processSMPTransmissions c@AgentClient {subQ} (tSess@(userId, srv, _), _v, sessId
 
           smpInvitation :: SMP.MsgId -> Connection c -> ConnectionRequestUri 'CMInvitation -> ConnInfo -> AM ()
           smpInvitation srvMsgId conn' connReq@(CRInvitationUri crData _) cInfo = do
-            logServer "<--" c srv rId $ "MSG <KEY>:" <> logSecret srvMsgId
+            logServer "<--" c srv rId $ "MSG <KEY>:" <> logSecret' srvMsgId
             case conn' of
               ContactConnection {} -> do
                 -- show connection request even if invitaion via contact address is not compatible.
@@ -2853,7 +2905,7 @@ secureConfirmQueue c cData@ConnData {connId, connAgentVersion, pqSupport} sq srv
       currentE2EVersion <- asks $ maxVersion . e2eEncryptVRange . config
       withStore c $ \db -> runExceptT $ do
         let agentMsgBody = smpEncode aMessage
-        (_, internalSndId, _) <- liftIO $ updateSndIds db connId
+        (_, internalSndId, _) <- ExceptT $ updateSndIds db connId
         liftIO $ updateSndMsgHash db connId internalSndId (C.sha256Hash agentMsgBody)
         let pqEnc = CR.pqSupportToEnc pqSupport
         (encConnInfo, _) <- agentRatchetEncrypt db cData agentMsgBody e2eEncConnInfoLength (Just pqEnc) currentE2EVersion
@@ -2886,7 +2938,7 @@ storeConfirmation c cData@ConnData {connId, pqSupport, connAgentVersion = v} sq
   currentE2EVersion <- asks $ maxVersion . e2eEncryptVRange . config
   withStore c $ \db -> runExceptT $ do
     internalTs <- liftIO getCurrentTime
-    (internalId, internalSndId, prevMsgHash) <- liftIO $ updateSndIds db connId
+    (internalId, internalSndId, prevMsgHash) <- ExceptT $ updateSndIds db connId
     let agentMsgStr = smpEncode agentMsg
         internalHash = C.sha256Hash agentMsgStr
         pqEnc = CR.pqSupportToEnc pqSupport
@@ -2912,7 +2964,7 @@ enqueueRatchetKey c cData@ConnData {connId} sq e2eEncryption = do
     storeRatchetKey :: VersionSMPA -> AM InternalId
     storeRatchetKey agentVersion = withStore c $ \db -> runExceptT $ do
       internalTs <- liftIO getCurrentTime
-      (internalId, internalSndId, prevMsgHash) <- liftIO $ updateSndIds db connId
+      (internalId, internalSndId, prevMsgHash) <- ExceptT $ updateSndIds db connId
       let agentMsg = AgentRatchetInfo ""
           agentMsgStr = smpEncode agentMsg
           internalHash = C.sha256Hash agentMsgStr

src/Simplex/Messaging/Agent/Client.hs

@@ -1,5 +1,6 @@
 {-# LANGUAGE AllowAmbiguousTypes #-}
 {-# LANGUAGE BangPatterns #-}
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE ConstraintKinds #-}
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE DeriveAnyClass #-}
@@ -12,6 +13,7 @@
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE OverloadedLists #-}
 {-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE PatternSynonyms #-}
 {-# LANGUAGE RankNTypes #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE StrictData #-}
@@ -29,6 +31,7 @@ module Simplex.Messaging.Agent.Client
     withConnLocks,
     withInvLock,
     withLockMap,
+    getMapLock,
     ipAddressProtected,
     closeAgentClient,
     closeProtocolServerClients,
@@ -55,8 +58,10 @@ module Simplex.Messaging.Agent.Client
     secureQueue,
     secureSndQueue,
     enableQueueNotifications,
+    EnableQueueNtfReq (..),
     enableQueuesNtfs,
     disableQueueNotifications,
+    DisableQueueNtfReq,
     disableQueuesNtfs,
     sendAgentMessage,
     getQueueInfo,
@@ -67,7 +72,9 @@ module Simplex.Messaging.Agent.Client
     agentNtfDeleteToken,
     agentNtfEnableCron,
     agentNtfCreateSubscription,
+    agentNtfCreateSubscriptions,
     agentNtfCheckSubscription,
+    agentNtfCheckSubscriptions,
     agentNtfDeleteSubscription,
     agentXFTPDownloadChunk,
     agentXFTPNewChunk,
@@ -82,10 +89,12 @@ module Simplex.Messaging.Agent.Client
     deleteQueues,
     logServer,
     logSecret,
+    logSecret',
     removeSubscription,
     hasActiveSubscription,
     hasPendingSubscription,
     hasGetLock,
+    releaseGetLock,
     activeClientSession,
     agentClientStore,
     agentDRG,
@@ -113,6 +122,7 @@ module Simplex.Messaging.Agent.Client
     hasWorkToDo,
     hasWorkToDo',
     withWork,
+    withWorkItems,
     agentOperations,
     agentOperationBracket,
     waitUntilActive,
@@ -140,7 +150,6 @@ module Simplex.Messaging.Agent.Client
     userServers,
     pickServer,
     getNextServer,
-    withUserServers,
     withNextSrv,
     incSMPServerStat,
     incSMPServerStat',
@@ -148,6 +157,7 @@ module Simplex.Messaging.Agent.Client
     incXFTPServerStat',
     incXFTPServerSizeStat,
     incNtfServerStat,
+    incNtfServerStat',
     AgentWorkersDetails (..),
     getAgentWorkersDetails,
     AgentWorkersSummary (..),
@@ -183,12 +193,12 @@ import qualified Data.ByteString.Char8 as B
 import Data.Either (isRight, partitionEithers)
 import Data.Functor (($>))
 import Data.Int (Int64)
-import Data.List (deleteFirstsBy, foldl', partition, (\\))
+import Data.List (find, foldl', partition)
 import Data.List.NonEmpty (NonEmpty (..), (<|))
 import qualified Data.List.NonEmpty as L
 import Data.Map.Strict (Map)
 import qualified Data.Map.Strict as M
-import Data.Maybe (catMaybes, fromMaybe, isJust, isNothing, listToMaybe)
+import Data.Maybe (catMaybes, fromMaybe, isJust, isNothing, listToMaybe, mapMaybe)
 import Data.Set (Set)
 import qualified Data.Set as S
 import Data.Text (Text)
@@ -196,7 +206,6 @@ import Data.Text.Encoding
 import Data.Time (UTCTime, addUTCTime, defaultTimeLocale, formatTime, getCurrentTime)
 import Data.Time.Clock.System (getSystemTime)
 import Data.Word (Word16)
-import qualified Database.SQLite.Simple as SQL
 import Network.Socket (HostName)
 import Simplex.FileTransfer.Client (XFTPChunkSpec (..), XFTPClient, XFTPClientConfig (..), XFTPClientError)
 import qualified Simplex.FileTransfer.Client as X
@@ -212,8 +221,8 @@ import Simplex.Messaging.Agent.Protocol
 import Simplex.Messaging.Agent.RetryInterval
 import Simplex.Messaging.Agent.Stats
 import Simplex.Messaging.Agent.Store
-import Simplex.Messaging.Agent.Store.SQLite (SQLiteStore (..), withTransaction)
-import qualified Simplex.Messaging.Agent.Store.SQLite.DB as DB
+import Simplex.Messaging.Agent.Store.Common (DBStore, withTransaction)
+import qualified Simplex.Messaging.Agent.Store.DB as DB
 import Simplex.Messaging.Agent.TRcvQueues (TRcvQueues (getRcvQueues))
 import qualified Simplex.Messaging.Agent.TRcvQueues as RQ
 import Simplex.Messaging.Client
@@ -228,7 +237,7 @@ import Simplex.Messaging.Parsers (defaultJSON, dropPrefix, enumJSON, parse, sumT
 import Simplex.Messaging.Protocol
   ( AProtocolType (..),
     BrokerMsg,
-    EntityId,
+    EntityId (..),
     ErrorType,
     MsgFlags (..),
     MsgId,
@@ -241,7 +250,6 @@ import Simplex.Messaging.Protocol
     ProtocolServer (..),
     ProtocolType (..),
     ProtocolTypeI (..),
-    QueueId,
     QueueIdsKeys (..),
     RcvMessage (..),
     RcvNtfPublicDhKey,
@@ -255,7 +263,7 @@ import Simplex.Messaging.Protocol
     VersionSMPC,
     XFTPServer,
     XFTPServerWithAuth,
-    sameSrvAddr',
+    pattern NoEntity,
   )
 import qualified Simplex.Messaging.Protocol as SMP
 import Simplex.Messaging.Server.QueueStore.QueueInfo
@@ -274,6 +282,9 @@ import UnliftIO.Concurrent (forkIO, mkWeakThreadId)
 import UnliftIO.Directory (doesFileExist, getTemporaryDirectory, removeFile)
 import qualified UnliftIO.Exception as E
 import UnliftIO.STM
+#if !defined(dbPostgres)
+import qualified Database.SQLite.Simple as SQL
+#endif
 
 type ClientVar msg = SessionVar (Either (AgentErrorType, Maybe UTCTime) (Client msg))
 
@@ -331,6 +342,7 @@ data AgentClient = AgentClient
     smpSubWorkers :: TMap SMPTransportSession (SessionVar (Async ())),
     clientId :: Int,
     agentEnv :: Env,
+    proxySessTs :: TVar UTCTime,
     smpServersStats :: TMap (UserId, SMPServer) AgentSMPServerStats,
     xftpServersStats :: TMap (UserId, XFTPServer) AgentXFTPServerStats,
     ntfServersStats :: TMap (UserId, NtfServer) AgentNtfServerStats,
@@ -459,6 +471,7 @@ newAgentClient :: Int -> InitialAgentServers -> UTCTime -> Env -> IO AgentClient
 newAgentClient clientId InitialAgentServers {smp, ntf, xftp, netCfg} currentTs agentEnv = do
   let cfg = config agentEnv
       qSize = tbqSize cfg
+  proxySessTs <- newTVarIO =<< getCurrentTime
   acThread <- newTVarIO Nothing
   active <- newTVarIO True
   subQ <- newTBQueueIO qSize
@@ -489,7 +502,7 @@ newAgentClient clientId InitialAgentServers {smp, ntf, xftp, netCfg} currentTs a
   getMsgLocks <- TM.emptyIO
   connLocks <- TM.emptyIO
   invLocks <- TM.emptyIO
-  deleteLock <- atomically createLock
+  deleteLock <- createLockIO
   smpSubWorkers <- TM.emptyIO
   smpServersStats <- TM.emptyIO
   xftpServersStats <- TM.emptyIO
@@ -531,6 +544,7 @@ newAgentClient clientId InitialAgentServers {smp, ntf, xftp, netCfg} currentTs a
         smpSubWorkers,
         clientId,
         agentEnv,
+        proxySessTs,
         smpServersStats,
         xftpServersStats,
         ntfServersStats,
@@ -544,7 +558,7 @@ slowNetworkConfig cfg@NetworkConfig {tcpConnectTimeout, tcpTimeout, tcpTimeoutPe
     slow :: Integral a => a -> a
     slow t = (t * 3) `div` 2
 
-agentClientStore :: AgentClient -> SQLiteStore
+agentClientStore :: AgentClient -> DBStore
 agentClientStore AgentClient {agentEnv = Env {store}} = store
 {-# INLINE agentClientStore #-}
 
@@ -606,7 +620,7 @@ getSMPServerClient c@AgentClient {active, smpClients, workerSeq} tSess = do
 getSMPProxyClient :: AgentClient -> Maybe SMPServerWithAuth -> SMPTransportSession -> AM (SMPConnectedClient, Either AgentErrorType ProxiedRelay)
 getSMPProxyClient c@AgentClient {active, smpClients, smpProxiedRelays, workerSeq} proxySrv_ destSess@(userId, destSrv, qId) = do
   unlessM (readTVarIO active) $ throwE INACTIVE
-  proxySrv <- maybe (getNextServer c userId [destSrv]) pure proxySrv_
+  proxySrv <- maybe (getNextServer c userId proxySrvs [destSrv]) pure proxySrv_
   ts <- liftIO getCurrentTime
   atomically (getClientVar proxySrv ts) >>= \(tSess, auth, v) ->
     either (newProxyClient tSess auth ts) (waitForProxyClient tSess auth) v
@@ -655,7 +669,7 @@ getSMPProxyClient c@AgentClient {active, smpClients, smpProxiedRelays, workerSeq
         Nothing -> Left $ BROKER (B.unpack $ strEncode srv) TIMEOUT
 
 smpConnectClient :: AgentClient -> SMPTransportSession -> TMap SMPServer ProxiedRelayVar -> SMPClientVar -> AM SMPConnectedClient
-smpConnectClient c@AgentClient {smpClients, msgQ} tSess@(_, srv, _) prs v =
+smpConnectClient c@AgentClient {smpClients, msgQ, proxySessTs} tSess@(_, srv, _) prs v =
   newProtocolClient c tSess smpClients connectClient v
     `catchAgentError` \e -> lift (resubscribeSMPSession c tSess) >> throwE e
   where
@@ -665,7 +679,8 @@ smpConnectClient c@AgentClient {smpClients, msgQ} tSess@(_, srv, _) prs v =
       g <- asks random
       env <- ask
       liftError (protocolClientError SMP $ B.unpack $ strEncode srv) $ do
-        smp <- ExceptT $ getProtocolClient g tSess cfg (Just msgQ) $ smpClientDisconnected c tSess env v' prs
+        ts <- readTVarIO proxySessTs
+        smp <- ExceptT $ getProtocolClient g tSess cfg (Just msgQ) ts $ smpClientDisconnected c tSess env v' prs
         pure SMPConnectedClient {connectedClient = smp, proxiedRelays = prs}
 
 smpClientDisconnected :: AgentClient -> SMPTransportSession -> Env -> SMPClientVar -> TMap SMPServer ProxiedRelayVar -> SMPClient -> IO ()
@@ -754,7 +769,7 @@ reconnectSMPClient c tSess@(_, srv, _) qs = handleNotify $ do
     notifySub connId cmd = atomically $ writeTBQueue (subQ c) ("", connId, AEvt (sAEntity @e) cmd)
 
 getNtfServerClient :: AgentClient -> NtfTransportSession -> AM NtfClient
-getNtfServerClient c@AgentClient {active, ntfClients, workerSeq} tSess@(_, srv, _) = do
+getNtfServerClient c@AgentClient {active, ntfClients, workerSeq, proxySessTs} tSess@(_, srv, _) = do
   unlessM (readTVarIO active) $ throwE INACTIVE
   ts <- liftIO getCurrentTime
   atomically (getSessVar workerSeq tSess ntfClients ts)
@@ -766,8 +781,9 @@ getNtfServerClient c@AgentClient {active, ntfClients, workerSeq} tSess@(_, srv,
     connectClient v = do
       cfg <- lift $ getClientConfig c ntfCfg
       g <- asks random
+      ts <- readTVarIO proxySessTs
       liftError' (protocolClientError NTF $ B.unpack $ strEncode srv) $
-        getProtocolClient g tSess cfg Nothing $
+        getProtocolClient g tSess cfg Nothing ts $
           clientDisconnected v
 
     clientDisconnected :: NtfClientVar -> NtfClient -> IO ()
@@ -777,7 +793,7 @@ getNtfServerClient c@AgentClient {active, ntfClients, workerSeq} tSess@(_, srv,
       logInfo . decodeUtf8 $ "Agent disconnected from " <> showServer srv
 
 getXFTPServerClient :: AgentClient -> XFTPTransportSession -> AM XFTPClient
-getXFTPServerClient c@AgentClient {active, xftpClients, workerSeq} tSess@(_, srv, _) = do
+getXFTPServerClient c@AgentClient {active, xftpClients, workerSeq, proxySessTs} tSess@(_, srv, _) = do
   unlessM (readTVarIO active) $ throwE INACTIVE
   ts <- liftIO getCurrentTime
   atomically (getSessVar workerSeq tSess xftpClients ts)
@@ -789,8 +805,9 @@ getXFTPServerClient c@AgentClient {active, xftpClients, workerSeq} tSess@(_, srv
     connectClient v = do
       cfg <- asks $ xftpCfg . config
       xftpNetworkConfig <- getNetworkConfig c
+      ts <- readTVarIO proxySessTs
       liftError' (protocolClientError XFTP $ B.unpack $ strEncode srv) $
-        X.getXFTPClient tSess cfg {xftpNetworkConfig} $
+        X.getXFTPClient tSess cfg {xftpNetworkConfig} ts $
           clientDisconnected v
 
     clientDisconnected :: XFTPClientVar -> XFTPClient -> IO ()
@@ -996,7 +1013,7 @@ withClient_ c tSess@(_, srv, _) action = do
   where
     logServerError :: AgentErrorType -> AM a
     logServerError e = do
-      logServer "<--" c srv "" $ bshow e
+      logServer "<--" c srv NoEntity $ bshow e
       throwE e
 
 withProxySession :: AgentClient -> Maybe SMPServerWithAuth -> SMPTransportSession -> SMP.SenderId -> ByteString -> ((SMPConnectedClient, ProxiedRelay) -> AM a) -> AM a
@@ -1013,32 +1030,32 @@ withProxySession c proxySrv_ destSess@(_, destSrv, _) entId cmdStr action = do
     proxySrv = showServer . protocolClientServer' . protocolClient
     logServerError :: SMPConnectedClient -> AgentErrorType -> AM a
     logServerError cl e = do
-      logServer ("<-- " <> proxySrv cl <> " <") c destSrv "" $ bshow e
+      logServer ("<-- " <> proxySrv cl <> " <") c destSrv NoEntity $ bshow e
       throwE e
 
-withLogClient_ :: ProtocolServerClient v err msg => AgentClient -> TransportSession msg -> EntityId -> ByteString -> (Client msg -> AM a) -> AM a
+withLogClient_ :: ProtocolServerClient v err msg => AgentClient -> TransportSession msg -> ByteString -> ByteString -> (Client msg -> AM a) -> AM a
 withLogClient_ c tSess@(_, srv, _) entId cmdStr action = do
-  logServer "-->" c srv entId cmdStr
+  logServer' "-->" c srv entId cmdStr
   res <- withClient_ c tSess action
-  logServer "<--" c srv entId "OK"
+  logServer' "<--" c srv entId "OK"
   return res
 
 withClient :: forall v err msg a. ProtocolServerClient v err msg => AgentClient -> TransportSession msg -> (Client msg -> ExceptT (ProtocolClientError err) IO a) -> AM a
 withClient c tSess action = withClient_ c tSess $ \client -> liftClient (clientProtocolError @v @err @msg) (clientServer $ protocolClient client) $ action client
 {-# INLINE withClient #-}
 
-withLogClient :: forall v err msg a. ProtocolServerClient v err msg => AgentClient -> TransportSession msg -> EntityId -> ByteString -> (Client msg -> ExceptT (ProtocolClientError err) IO a) -> AM a
+withLogClient :: forall v err msg a. ProtocolServerClient v err msg => AgentClient -> TransportSession msg -> ByteString -> ByteString -> (Client msg -> ExceptT (ProtocolClientError err) IO a) -> AM a
 withLogClient c tSess entId cmdStr action = withLogClient_ c tSess entId cmdStr $ \client -> liftClient (clientProtocolError @v @err @msg) (clientServer $ protocolClient client) $ action client
 {-# INLINE withLogClient #-}
 
 withSMPClient :: SMPQueueRec q => AgentClient -> q -> ByteString -> (SMPClient -> ExceptT SMPClientError IO a) -> AM a
 withSMPClient c q cmdStr action = do
   tSess <- mkSMPTransportSession c q
-  withLogClient c tSess (queueId q) cmdStr $ action . connectedClient
+  withLogClient c tSess (unEntityId $ queueId q) cmdStr $ action . connectedClient
 
-sendOrProxySMPMessage :: AgentClient -> UserId -> SMPServer -> ByteString -> Maybe SMP.SndPrivateAuthKey -> SMP.SenderId -> MsgFlags -> SMP.MsgBody -> AM (Maybe SMPServer)
-sendOrProxySMPMessage c userId destSrv cmdStr spKey_ senderId msgFlags msg =
-  sendOrProxySMPCommand c userId destSrv cmdStr senderId sendViaProxy sendDirectly
+sendOrProxySMPMessage :: AgentClient -> UserId -> SMPServer -> ConnId -> ByteString -> Maybe SMP.SndPrivateAuthKey -> SMP.SenderId -> MsgFlags -> SMP.MsgBody -> AM (Maybe SMPServer)
+sendOrProxySMPMessage c userId destSrv connId cmdStr spKey_ senderId msgFlags msg =
+  sendOrProxySMPCommand c userId destSrv connId cmdStr senderId sendViaProxy sendDirectly
   where
     sendViaProxy smp proxySess = do
       atomically $ incSMPServerStat c userId destSrv sentViaProxyAttempts
@@ -1052,14 +1069,15 @@ sendOrProxySMPCommand ::
   AgentClient ->
   UserId ->
   SMPServer ->
+  ConnId ->
   ByteString ->
   SMP.SenderId ->
   (SMPClient -> ProxiedRelay -> ExceptT SMPClientError IO (Either ProxyClientError ())) ->
   (SMPClient -> ExceptT SMPClientError IO ()) ->
   AM (Maybe SMPServer)
-sendOrProxySMPCommand c userId destSrv cmdStr senderId sendCmdViaProxy sendCmdDirectly = do
-  sess <- mkTransportSession c userId destSrv senderId
-  ifM shouldUseProxy (sendViaProxy Nothing sess) (sendDirectly sess $> Nothing)
+sendOrProxySMPCommand c userId destSrv@ProtocolServer {host = destHosts} connId cmdStr senderId sendCmdViaProxy sendCmdDirectly = do
+  tSess <- mkTransportSession c userId destSrv connId
+  ifM shouldUseProxy (sendViaProxy Nothing tSess) (sendDirectly tSess $> Nothing)
   where
     shouldUseProxy = do
       cfg <- getNetworkConfig c
@@ -1076,9 +1094,9 @@ sendOrProxySMPCommand c userId destSrv cmdStr senderId sendCmdViaProxy sendCmdDi
         SPFAllow -> True
         SPFAllowProtected -> ipAddressProtected cfg destSrv
         SPFProhibit -> False
-    unknownServer = liftIO $ maybe True (notElem destSrv . knownSrvs) <$> TM.lookupIO userId (smpServers c)
+    unknownServer = liftIO $ maybe True (\srvs -> all (`S.notMember` knownHosts srvs) destHosts) <$> TM.lookupIO userId (smpServers c)
     sendViaProxy :: Maybe SMPServerWithAuth -> SMPTransportSession -> AM (Maybe SMPServer)
-    sendViaProxy proxySrv_ destSess@(_, _, qId) = do
+    sendViaProxy proxySrv_ destSess@(_, _, connId_) = do
       r <- tryAgentError . withProxySession c proxySrv_ destSess senderId ("PFWD " <> cmdStr) $ \(SMPConnectedClient smp _, proxySess@ProxiedRelay {prBasicAuth}) -> do
         r' <- liftClient SMP (clientServer smp) $ sendCmdViaProxy smp proxySess
         let proxySrv = protocolClientServer' smp
@@ -1105,7 +1123,7 @@ sendOrProxySMPCommand c userId destSrv cmdStr senderId sendCmdViaProxy sendCmdDi
               -- checks that the current proxied relay session is the same one that was used to send the message and removes it
               deleteRelaySession =
                 ( TM.lookup destSess (smpProxiedRelays c)
-                    $>>= \(ProtoServerWithAuth srv _) -> tryReadSessVar (userId, srv, qId) (smpClients c)
+                    $>>= \(ProtoServerWithAuth srv _) -> tryReadSessVar (userId, srv, connId_) (smpClients c)
                 )
                   >>= \case
                     Just (Right (SMPConnectedClient smp' prs))
@@ -1125,7 +1143,7 @@ sendOrProxySMPCommand c userId destSrv cmdStr senderId sendCmdViaProxy sendCmdDi
           | serverHostError e -> ifM directAllowed (sendDirectly destSess $> Nothing) (throwE e)
           | otherwise -> throwE e
     sendDirectly tSess =
-      withLogClient_ c tSess senderId ("SEND " <> cmdStr) $ \(SMPConnectedClient smp _) -> do
+      withLogClient_ c tSess (unEntityId senderId) ("SEND " <> cmdStr) $ \(SMPConnectedClient smp _) -> do
         r <- tryAgentError $ liftClient SMP (clientServer smp) $ sendCmdDirectly smp
         case r of
           Right () -> atomically $ incSMPServerStat c userId destSrv sentDirect
@@ -1138,18 +1156,18 @@ ipAddressProtected NetworkConfig {socksProxy, hostMode} (ProtocolServer _ hosts
     isOnionHost = \case THOnionHost _ -> True; _ -> False
 
 withNtfClient :: AgentClient -> NtfServer -> EntityId -> ByteString -> (NtfClient -> ExceptT NtfClientError IO a) -> AM a
-withNtfClient c srv = withLogClient c (0, srv, Nothing)
+withNtfClient c srv (EntityId entId) = withLogClient c (0, srv, Nothing) entId
 
 withXFTPClient ::
   ProtocolServerClient v err msg =>
   AgentClient ->
-  (UserId, ProtoServer msg, EntityId) ->
+  (UserId, ProtoServer msg, ByteString) ->
   ByteString ->
   (Client msg -> ExceptT (ProtocolClientError err) IO b) ->
   AM b
-withXFTPClient c (userId, srv, entityId) cmdStr action = do
-  tSess <- mkTransportSession c userId srv entityId
-  withLogClient c tSess entityId cmdStr action
+withXFTPClient c (userId, srv, sessEntId) cmdStr action = do
+  tSess <- mkTransportSession c userId srv sessEntId
+  withLogClient c tSess sessEntId cmdStr action
 
 liftClient :: (Show err, Encoding err) => (HostName -> err -> AgentErrorType) -> HostName -> ExceptT (ProtocolClientError err) IO a -> AM a
 liftClient protocolError_ = liftError . protocolClientError protocolError_
@@ -1196,7 +1214,8 @@ runSMPServerTest c userId (ProtoServerWithAuth srv auth) = do
   g <- asks random
   liftIO $ do
     let tSess = (userId, srv, Nothing)
-    getProtocolClient g tSess cfg Nothing (\_ -> pure ()) >>= \case
+    ts <- readTVarIO $ proxySessTs c
+    getProtocolClient g tSess cfg Nothing ts (\_ -> pure ()) >>= \case
       Right smp -> do
         rKeys@(_, rpKey) <- atomically $ C.generateAuthKeyPair ra g
         (sKey, spKey) <- atomically $ C.generateAuthKeyPair sa g
@@ -1226,7 +1245,8 @@ runXFTPServerTest c userId (ProtoServerWithAuth srv auth) = do
   rcvPath <- getTempFilePath workDir
   liftIO $ do
     let tSess = (userId, srv, Nothing)
-    X.getXFTPClient tSess cfg {xftpNetworkConfig} (\_ -> pure ()) >>= \case
+    ts <- readTVarIO $ proxySessTs c
+    X.getXFTPClient tSess cfg {xftpNetworkConfig} ts (\_ -> pure ()) >>= \case
       Right xftp -> withTestChunk filePath $ do
         (sndKey, spKey) <- atomically $ C.generateAuthKeyPair C.SEd25519 g
         (rcvKey, rpKey) <- atomically $ C.generateAuthKeyPair C.SEd25519 g
@@ -1270,7 +1290,8 @@ runNTFServerTest c userId (ProtoServerWithAuth srv _) = do
   g <- asks random
   liftIO $ do
     let tSess = (userId, srv, Nothing)
-    getProtocolClient g tSess cfg Nothing (\_ -> pure ()) >>= \case
+    ts <- readTVarIO $ proxySessTs c
+    getProtocolClient g tSess cfg Nothing ts (\_ -> pure ()) >>= \case
       Right ntf -> do
         (nKey, npKey) <- atomically $ C.generateAuthKeyPair a g
         (dhKey, _) <- atomically $ C.generateKeyPair g
@@ -1291,12 +1312,12 @@ getXFTPWorkPath = do
   workDir <- readTVarIO =<< asks (xftpWorkDir . xftpAgent)
   maybe getTemporaryDirectory pure workDir
 
-mkTransportSession :: MonadIO m => AgentClient -> UserId -> ProtoServer msg -> EntityId -> m (TransportSession msg)
-mkTransportSession c userId srv entityId = mkTSession userId srv entityId <$> getSessionMode c
+mkTransportSession :: MonadIO m => AgentClient -> UserId -> ProtoServer msg -> ByteString -> m (TransportSession msg)
+mkTransportSession c userId srv sessEntId = mkTSession userId srv sessEntId <$> getSessionMode c
 {-# INLINE mkTransportSession #-}
 
-mkTSession :: UserId -> ProtoServer msg -> EntityId -> TransportSessionMode -> TransportSession msg
-mkTSession userId srv entityId mode = (userId, srv, if mode == TSMEntity then Just entityId else Nothing)
+mkTSession :: UserId -> ProtoServer msg -> ByteString -> TransportSessionMode -> TransportSession msg
+mkTSession userId srv sessEntId mode = (userId, srv, if mode == TSMEntity then Just sessEntId else Nothing)
 {-# INLINE mkTSession #-}
 
 mkSMPTransportSession :: (SMPQueueRec q, MonadIO m) => AgentClient -> q -> m SMPTransportSession
@@ -1318,12 +1339,12 @@ newRcvQueue c userId connId (ProtoServerWithAuth srv auth) vRange subMode sender
   rKeys@(_, rcvPrivateKey) <- atomically $ C.generateAuthKeyPair a g
   (dhKey, privDhKey) <- atomically $ C.generateKeyPair g
   (e2eDhKey, e2ePrivKey) <- atomically $ C.generateKeyPair g
-  logServer "-->" c srv "" "NEW"
+  logServer "-->" c srv NoEntity "NEW"
   tSess <- mkTransportSession c userId srv connId
   (sessId, QIK {rcvId, sndId, rcvPublicDhKey, sndSecure}) <-
     withClient c tSess $ \(SMPConnectedClient smp _) ->
       (sessionId $ thParams smp,) <$> createSMPQueue smp rKeys dhKey auth subMode senderCanSecure
-  liftIO . logServer "<--" c srv "" $ B.unwords ["IDS", logSecret rcvId, logSecret sndId]
+  liftIO . logServer "<--" c srv NoEntity $ B.unwords ["IDS", logSecret rcvId, logSecret sndId]
   let rq =
         RcvQueue
           { userId,
@@ -1368,6 +1389,7 @@ temporaryAgentError = \case
   PROXY _ _ (ProxyProtocolError (SMP.PROXY (SMP.BROKER e))) -> tempBrokerError e
   PROXY _ _ (ProxyProtocolError (SMP.PROXY SMP.NO_SESSION)) -> True
   INACTIVE -> True
+  CRITICAL True _ -> True -- critical errors that do not show restart button are likely to be permanent
   _ -> False
   where
     tempBrokerError = \case
@@ -1407,7 +1429,7 @@ subscribeQueues c qs = do
     checkQueue rq = do
       prohibited <- liftIO $ hasGetLock c rq
       pure $ if prohibited then Left (rq, Left $ CMD PROHIBITED "subscribeQueues") else Right rq
-    subscribeQueues_ :: Env -> TVar (Maybe SessionId) -> SMPClient -> NonEmpty RcvQueue -> IO (BatchResponses SMPClientError ())
+    subscribeQueues_ :: Env -> TVar (Maybe SessionId) -> SMPClient -> NonEmpty RcvQueue -> IO (BatchResponses RcvQueue SMPClientError ())
     subscribeQueues_ env session smp qs' = do
       let (userId, srv, _) = transportSession' smp
       atomically $ incSMPServerStat' c userId srv connSubAttempts $ length qs'
@@ -1438,31 +1460,33 @@ activeClientSession c tSess sessId = sameSess <$> tryReadSessVar tSess (smpClien
       Just (Right (SMPConnectedClient smp _)) -> sessId == sessionId (thParams smp)
       _ -> False
 
-type BatchResponses e r = NonEmpty (RcvQueue, Either e r)
+type BatchResponses q e r = NonEmpty (q, Either e r)
 
-sendTSessionBatches :: forall q r. ByteString -> (q -> RcvQueue) -> (SMPClient -> NonEmpty q -> IO (BatchResponses SMPClientError r)) -> AgentClient -> [q] -> AM' [(RcvQueue, Either AgentErrorType r)]
+-- Please note: this function does not preserve order of results to be the same as the order of arguments,
+-- it includes arguments in the results instead.
+sendTSessionBatches :: forall q r. ByteString -> (q -> RcvQueue) -> (SMPClient -> NonEmpty q -> IO (BatchResponses q SMPClientError r)) -> AgentClient -> [q] -> AM' [(q, Either AgentErrorType r)]
 sendTSessionBatches statCmd toRQ action c qs =
   concatMap L.toList <$> (mapConcurrently sendClientBatch =<< batchQueues)
   where
     batchQueues :: AM' [(SMPTransportSession, NonEmpty q)]
     batchQueues = do
       mode <- getSessionMode c
-      pure . M.assocs $ foldl' (batch mode) M.empty qs
+      pure . M.assocs $ foldr (batch mode) M.empty qs
       where
-        batch mode m q =
+        batch mode q m =
           let tSess = mkSMPTSession (toRQ q) mode
            in M.alter (Just . maybe [q] (q <|)) tSess m
-    sendClientBatch :: (SMPTransportSession, NonEmpty q) -> AM' (BatchResponses AgentErrorType r)
+    sendClientBatch :: (SMPTransportSession, NonEmpty q) -> AM' (BatchResponses q AgentErrorType r)
     sendClientBatch (tSess@(_, srv, _), qs') =
       tryAgentError' (getSMPServerClient c tSess) >>= \case
-        Left e -> pure $ L.map ((,Left e) . toRQ) qs'
+        Left e -> pure $ L.map (,Left e) qs'
         Right (SMPConnectedClient smp _) -> liftIO $ do
-          logServer "-->" c srv (bshow (length qs') <> " queues") statCmd
+          logServer' "-->" c srv (bshow (length qs') <> " queues") statCmd
           L.map agentError <$> action smp qs'
           where
             agentError = second . first $ protocolClientError SMP $ clientServer smp
 
-sendBatch :: (SMPClient -> NonEmpty (SMP.RcvPrivateAuthKey, SMP.RecipientId) -> IO (NonEmpty (Either SMPClientError ()))) -> SMPClient -> NonEmpty RcvQueue -> IO (BatchResponses SMPClientError ())
+sendBatch :: (SMPClient -> NonEmpty (SMP.RcvPrivateAuthKey, SMP.RecipientId) -> IO (NonEmpty (Either SMPClientError ()))) -> SMPClient -> NonEmpty RcvQueue -> IO (BatchResponses RcvQueue SMPClientError ())
 sendBatch smpCmdFunc smp qs = L.zip qs <$> smpCmdFunc smp (L.map queueCreds qs)
   where
     queueCreds RcvQueue {rcvPrivateKey, rcvId} = (rcvPrivateKey, rcvId)
@@ -1511,32 +1535,39 @@ getSubscriptions :: AgentClient -> IO (Set ConnId)
 getSubscriptions = readTVarIO . subscrConns
 {-# INLINE getSubscriptions #-}
 
-logServer :: MonadIO m => ByteString -> AgentClient -> ProtocolServer s -> QueueId -> ByteString -> m ()
-logServer dir AgentClient {clientId} srv qId cmdStr =
-  logInfo . decodeUtf8 $ B.unwords ["A", "(" <> bshow clientId <> ")", dir, showServer srv, ":", logSecret qId, cmdStr]
+logServer :: MonadIO m => ByteString -> AgentClient -> ProtocolServer s -> EntityId -> ByteString -> m ()
+logServer dir c srv = logServer' dir c srv . unEntityId
 {-# INLINE logServer #-}
 
+logServer' :: MonadIO m => ByteString -> AgentClient -> ProtocolServer s -> ByteString -> ByteString -> m ()
+logServer' dir AgentClient {clientId} srv qStr cmdStr =
+  logInfo . decodeUtf8 $ B.unwords ["A", "(" <> bshow clientId <> ")", dir, showServer srv, ":", logSecret' qStr, cmdStr]
+
 showServer :: ProtocolServer s -> ByteString
 showServer ProtocolServer {host, port} =
   strEncode host <> B.pack (if null port then "" else ':' : port)
 {-# INLINE showServer #-}
 
-logSecret :: ByteString -> ByteString
-logSecret bs = B64.encode $ B.take 3 bs
+logSecret :: EntityId -> ByteString
+logSecret = logSecret' . unEntityId
 {-# INLINE logSecret #-}
 
+logSecret' :: ByteString -> ByteString
+logSecret' = B64.encode . B.take 3
+{-# INLINE logSecret' #-}
+
 sendConfirmation :: AgentClient -> SndQueue -> ByteString -> AM (Maybe SMPServer)
-sendConfirmation c sq@SndQueue {userId, server, sndId, sndSecure, sndPublicKey, sndPrivateKey, e2ePubKey = e2ePubKey@Just {}} agentConfirmation = do
+sendConfirmation c sq@SndQueue {userId, server, connId, sndId, sndSecure, sndPublicKey, sndPrivateKey, e2ePubKey = e2ePubKey@Just {}} agentConfirmation = do
   let (privHdr, spKey) = if sndSecure then (SMP.PHEmpty, Just sndPrivateKey) else (SMP.PHConfirmation sndPublicKey, Nothing)
       clientMsg = SMP.ClientMessage privHdr agentConfirmation
   msg <- agentCbEncrypt sq e2ePubKey $ smpEncode clientMsg
-  sendOrProxySMPMessage c userId server "<CONF>" spKey sndId (MsgFlags {notification = True}) msg
+  sendOrProxySMPMessage c userId server connId "<CONF>" spKey sndId (MsgFlags {notification = True}) msg
 sendConfirmation _ _ _ = throwE $ INTERNAL "sendConfirmation called without snd_queue public key(s) in the database"
 
-sendInvitation :: AgentClient -> UserId -> Compatible SMPQueueInfo -> Compatible VersionSMPA -> ConnectionRequestUri 'CMInvitation -> ConnInfo -> AM (Maybe SMPServer)
-sendInvitation c userId (Compatible (SMPQueueInfo v SMPQueueAddress {smpServer, senderId, dhPublicKey})) (Compatible agentVersion) connReq connInfo = do
+sendInvitation :: AgentClient -> UserId -> ConnId -> Compatible SMPQueueInfo -> Compatible VersionSMPA -> ConnectionRequestUri 'CMInvitation -> ConnInfo -> AM (Maybe SMPServer)
+sendInvitation c userId connId (Compatible (SMPQueueInfo v SMPQueueAddress {smpServer, senderId, dhPublicKey})) (Compatible agentVersion) connReq connInfo = do
   msg <- mkInvitation
-  sendOrProxySMPMessage c userId smpServer "<INV>" Nothing senderId (MsgFlags {notification = True}) msg
+  sendOrProxySMPMessage c userId smpServer connId "<INV>" Nothing senderId (MsgFlags {notification = True}) msg
   where
     mkInvitation :: AM ByteString
     -- this is only encrypted with per-queue E2E, not with double ratchet
@@ -1562,7 +1593,7 @@ getQueueMessage c rq@RcvQueue {server, rcvId, rcvPrivateKey} = do
 
 decryptSMPMessage :: RcvQueue -> SMP.RcvMessage -> AM SMP.ClientRcvMsgBody
 decryptSMPMessage rq SMP.RcvMessage {msgId, msgBody = SMP.EncRcvMsgBody body} =
-  liftEither . parse SMP.clientRcvMsgBodyP (AGENT A_MESSAGE) =<< decrypt body
+  liftEither $ parse SMP.clientRcvMsgBodyP (AGENT A_MESSAGE) =<< decrypt body
   where
     decrypt = agentCbDecrypt (rcvDhSecret rq) (C.cbNonce msgId)
 
@@ -1572,8 +1603,8 @@ secureQueue c rq@RcvQueue {rcvId, rcvPrivateKey} senderKey =
     secureSMPQueue smp rcvPrivateKey rcvId senderKey
 
 secureSndQueue :: AgentClient -> SndQueue -> AM ()
-secureSndQueue c SndQueue {userId, server, sndId, sndPrivateKey, sndPublicKey} =
-  void $ sendOrProxySMPCommand c userId server "SKEY <key>" sndId secureViaProxy secureDirectly
+secureSndQueue c SndQueue {userId, connId, server, sndId, sndPrivateKey, sndPublicKey} =
+  void $ sendOrProxySMPCommand c userId server connId "SKEY <key>" sndId secureViaProxy secureDirectly
   where
     -- TODO track statistics
     secureViaProxy smp proxySess = proxySecureSndSMPQueue smp proxySess sndPrivateKey sndId sndPublicKey
@@ -1584,28 +1615,44 @@ enableQueueNotifications c rq@RcvQueue {rcvId, rcvPrivateKey} notifierKey rcvNtf
   withSMPClient c rq "NKEY <nkey>" $ \smp ->
     enableSMPQueueNotifications smp rcvPrivateKey rcvId notifierKey rcvNtfPublicDhKey
 
-enableQueuesNtfs :: AgentClient -> [(RcvQueue, SMP.NtfPublicAuthKey, SMP.RcvNtfPublicDhKey)] -> AM' [(RcvQueue, Either AgentErrorType (SMP.NotifierId, SMP.RcvNtfPublicDhKey))]
-enableQueuesNtfs = sendTSessionBatches "NKEY" fst3 enableQueues_
+data EnableQueueNtfReq = EnableQueueNtfReq
+  { eqnrNtfSub :: NtfSubscription,
+    eqnrRq :: RcvQueue,
+    eqnrAuthKeyPair :: C.AAuthKeyPair,
+    eqnrRcvKeyPair :: C.KeyPairX25519
+  }
+
+enableQueuesNtfs :: AgentClient -> [EnableQueueNtfReq] -> AM' [(EnableQueueNtfReq, Either AgentErrorType (SMP.NotifierId, SMP.RcvNtfPublicDhKey))]
+enableQueuesNtfs = sendTSessionBatches "NKEY" eqnrRq enableQueues_
   where
-    fst3 (x, _, _) = x
-    enableQueues_ :: SMPClient -> NonEmpty (RcvQueue, SMP.NtfPublicAuthKey, SMP.RcvNtfPublicDhKey) -> IO (NonEmpty (RcvQueue, Either (ProtocolClientError ErrorType) (SMP.NotifierId, RcvNtfPublicDhKey)))
-    enableQueues_ smp qs' = L.zipWith ((,) . fst3) qs' <$> enableSMPQueuesNtfs smp (L.map queueCreds qs')
-    queueCreds :: (RcvQueue, SMP.NtfPublicAuthKey, SMP.RcvNtfPublicDhKey) -> (SMP.RcvPrivateAuthKey, SMP.RecipientId, SMP.NtfPublicAuthKey, SMP.RcvNtfPublicDhKey)
-    queueCreds (RcvQueue {rcvPrivateKey, rcvId}, notifierKey, rcvNtfPublicDhKey) = (rcvPrivateKey, rcvId, notifierKey, rcvNtfPublicDhKey)
+    enableQueues_ :: SMPClient -> NonEmpty EnableQueueNtfReq -> IO (NonEmpty (EnableQueueNtfReq, Either (ProtocolClientError ErrorType) (SMP.NotifierId, RcvNtfPublicDhKey)))
+    enableQueues_ smp qs' = L.zip qs' <$> enableSMPQueuesNtfs smp (L.map queueCreds qs')
+    queueCreds :: EnableQueueNtfReq -> (SMP.RcvPrivateAuthKey, SMP.RecipientId, SMP.NtfPublicAuthKey, SMP.RcvNtfPublicDhKey)
+    queueCreds EnableQueueNtfReq {eqnrRq, eqnrAuthKeyPair, eqnrRcvKeyPair} =
+      let RcvQueue {rcvPrivateKey, rcvId} = eqnrRq
+          (ntfPublicKey, _) = eqnrAuthKeyPair
+          (rcvNtfPubDhKey, _) = eqnrRcvKeyPair
+       in (rcvPrivateKey, rcvId, ntfPublicKey, rcvNtfPubDhKey)
 
 disableQueueNotifications :: AgentClient -> RcvQueue -> AM ()
 disableQueueNotifications c rq@RcvQueue {rcvId, rcvPrivateKey} =
   withSMPClient c rq "NDEL" $ \smp ->
     disableSMPQueueNotifications smp rcvPrivateKey rcvId
 
-disableQueuesNtfs :: AgentClient -> [RcvQueue] -> AM' [(RcvQueue, Either AgentErrorType ())]
-disableQueuesNtfs = sendTSessionBatches "NDEL" id $ sendBatch disableSMPQueuesNtfs
+type DisableQueueNtfReq = (NtfSubscription, RcvQueue)
+
+disableQueuesNtfs :: AgentClient -> [DisableQueueNtfReq] -> AM' [(DisableQueueNtfReq, Either AgentErrorType ())]
+disableQueuesNtfs = sendTSessionBatches "NDEL" snd disableQueues_
+  where
+    disableQueues_ :: SMPClient -> NonEmpty DisableQueueNtfReq -> IO (NonEmpty (DisableQueueNtfReq, Either (ProtocolClientError ErrorType) ()))
+    disableQueues_ smp qs' = L.zip qs' <$> disableSMPQueuesNtfs smp (L.map queueCreds qs')
+    queueCreds :: DisableQueueNtfReq -> (SMP.RcvPrivateAuthKey, SMP.RecipientId)
+    queueCreds (_, RcvQueue {rcvPrivateKey, rcvId}) = (rcvPrivateKey, rcvId)
 
 sendAck :: AgentClient -> RcvQueue -> MsgId -> AM ()
-sendAck c rq@RcvQueue {rcvId, rcvPrivateKey} msgId = do
-  withSMPClient c rq ("ACK:" <> logSecret msgId) $ \smp ->
+sendAck c rq@RcvQueue {rcvId, rcvPrivateKey} msgId =
+  withSMPClient c rq ("ACK:" <> logSecret' msgId) $ \smp ->
     ackSMPMessage smp rcvPrivateKey rcvId msgId
-  atomically $ releaseGetLock c rq
 
 hasGetLock :: AgentClient -> RcvQueue -> IO Bool
 hasGetLock c RcvQueue {server, rcvId} =
@@ -1637,10 +1684,10 @@ deleteQueues c = sendTSessionBatches "DEL" id deleteQueues_ c
       pure rs
 
 sendAgentMessage :: AgentClient -> SndQueue -> MsgFlags -> ByteString -> AM (Maybe SMPServer)
-sendAgentMessage c sq@SndQueue {userId, server, sndId, sndPrivateKey} msgFlags agentMsg = do
+sendAgentMessage c sq@SndQueue {userId, server, connId, sndId, sndPrivateKey} msgFlags agentMsg = do
   let clientMsg = SMP.ClientMessage SMP.PHEmpty agentMsg
   msg <- agentCbEncrypt sq Nothing $ smpEncode clientMsg
-  sendOrProxySMPMessage c userId server "<MSG>" (Just sndPrivateKey) sndId msgFlags msg
+  sendOrProxySMPMessage c userId server connId "<MSG>" (Just sndPrivateKey) sndId msgFlags msg
 
 data ServerQueueInfo = ServerQueueInfo
   { server :: SMPServer,
@@ -1659,7 +1706,7 @@ getQueueInfo c rq@RcvQueue {server, rcvId, rcvPrivateKey, sndId, status, clientN
     let ntfId = enc . (\ClientNtfCreds {notifierId} -> notifierId) <$> clientNtfCreds
     pure ServerQueueInfo {server, rcvId = enc rcvId, sndId = enc sndId, ntfId, status = serializeQueueStatus status, info}
   where
-    enc = decodeLatin1 . B64.encode
+    enc = decodeLatin1 . B64.encode . unEntityId
 
 agentNtfRegisterToken :: AgentClient -> NtfToken -> NtfPublicAuthKey -> C.PublicKeyX25519 -> AM (NtfTokenId, C.PublicKeyX25519)
 agentNtfRegisterToken c NtfToken {deviceToken, ntfServer, ntfPrivKey} ntfPubKey pubDhKey =
@@ -1677,8 +1724,8 @@ agentNtfReplaceToken :: AgentClient -> NtfTokenId -> NtfToken -> DeviceToken ->
 agentNtfReplaceToken c tknId NtfToken {ntfServer, ntfPrivKey} token =
   withNtfClient c ntfServer tknId "TRPL" $ \ntf -> ntfReplaceToken ntf ntfPrivKey tknId token
 
-agentNtfDeleteToken :: AgentClient -> NtfTokenId -> NtfToken -> AM ()
-agentNtfDeleteToken c tknId NtfToken {ntfServer, ntfPrivKey} =
+agentNtfDeleteToken :: AgentClient -> NtfServer -> C.APrivateAuthKey -> NtfTokenId -> AM ()
+agentNtfDeleteToken c ntfServer ntfPrivKey tknId =
   withNtfClient c ntfServer tknId "TDEL" $ \ntf -> ntfDeleteToken ntf ntfPrivKey tknId
 
 agentNtfEnableCron :: AgentClient -> NtfTokenId -> NtfToken -> Word16 -> AM ()
@@ -1689,10 +1736,34 @@ agentNtfCreateSubscription :: AgentClient -> NtfTokenId -> NtfToken -> SMPQueueN
 agentNtfCreateSubscription c tknId NtfToken {ntfServer, ntfPrivKey} smpQueue nKey =
   withNtfClient c ntfServer tknId "SNEW" $ \ntf -> ntfCreateSubscription ntf ntfPrivKey (NewNtfSub tknId smpQueue nKey)
 
-agentNtfCheckSubscription :: AgentClient -> NtfSubscriptionId -> NtfToken -> AM NtfSubStatus
-agentNtfCheckSubscription c subId NtfToken {ntfServer, ntfPrivKey} =
+agentNtfCreateSubscriptions :: AgentClient -> NtfToken -> NonEmpty (NewNtfEntity 'Subscription) -> AM' (NonEmpty (Either AgentErrorType NtfSubscriptionId))
+agentNtfCreateSubscriptions = withNtfBatch "SNEW" ntfCreateSubscriptions
+
+agentNtfCheckSubscription :: AgentClient -> NtfToken -> NtfSubscriptionId -> AM NtfSubStatus
+agentNtfCheckSubscription c NtfToken {ntfServer, ntfPrivKey} subId =
   withNtfClient c ntfServer subId "SCHK" $ \ntf -> ntfCheckSubscription ntf ntfPrivKey subId
 
+agentNtfCheckSubscriptions :: AgentClient -> NtfToken -> NonEmpty NtfSubscriptionId -> AM' (NonEmpty (Either AgentErrorType NtfSubStatus))
+agentNtfCheckSubscriptions = withNtfBatch "SCHK" ntfCheckSubscriptions
+
+-- This batch sends all commands to one ntf server (client can only use one server at a time)
+withNtfBatch ::
+  ByteString ->
+  (NtfClient -> C.APrivateAuthKey -> NonEmpty a -> IO (NonEmpty (Either NtfClientError r))) ->
+  AgentClient ->
+  NtfToken ->
+  NonEmpty a ->
+  AM' (NonEmpty (Either AgentErrorType r))
+withNtfBatch cmdStr action c NtfToken {ntfServer, ntfPrivKey} subs = do
+  let tSess = (0, ntfServer, Nothing)
+  tryAgentError' (getNtfServerClient c tSess) >>= \case
+    Left e -> pure $ L.map (\_ -> Left e) subs
+    Right ntf -> liftIO $ do
+      logServer' "-->" c ntfServer (bshow (length subs) <> " subscriptions") cmdStr
+      L.map agentError <$> action ntf ntfPrivKey subs
+      where
+        agentError = first $ protocolClientError NTF $ clientServer ntf
+
 agentNtfDeleteSubscription :: AgentClient -> NtfSubscriptionId -> NtfToken -> AM ()
 agentNtfDeleteSubscription c subId NtfToken {ntfServer, ntfPrivKey} =
   withNtfClient c ntfServer subId "SDEL" $ \ntf -> ntfDeleteSubscription ntf ntfPrivKey subId
@@ -1707,10 +1778,10 @@ agentXFTPNewChunk c SndFileChunk {userId, chunkSpec = XFTPChunkSpec {chunkSize},
   rKeys <- xftpRcvKeys n
   (sndKey, replicaKey) <- atomically . C.generateAuthKeyPair C.SEd25519 =<< asks random
   let fileInfo = FileInfo {sndKey, size = chunkSize, digest = chunkDigest}
-  logServer "-->" c srv "" "FNEW"
+  logServer "-->" c srv NoEntity "FNEW"
   tSess <- mkTransportSession c userId srv chunkDigest
   (sndId, rIds) <- withClient c tSess $ \xftp -> X.createXFTPChunk xftp replicaKey fileInfo (L.map fst rKeys) auth
-  logServer "<--" c srv "" $ B.unwords ["SIDS", logSecret sndId]
+  logServer "<--" c srv NoEntity $ B.unwords ["SIDS", logSecret sndId]
   pure NewSndChunkReplica {server = srv, replicaId = ChunkReplicaId sndId, replicaKey, rcvIdsKeys = L.toList $ xftpRcvIdsKeys rIds rKeys}
 
 agentXFTPUploadChunk :: AgentClient -> UserId -> FileDigest -> SndFileChunkReplica -> XFTPChunkSpec -> AM ()
@@ -1734,7 +1805,7 @@ xftpRcvKeys n = do
     Just rKeys' -> pure rKeys'
     _ -> throwE $ INTERNAL "non-positive number of recipients"
 
-xftpRcvIdsKeys :: NonEmpty ByteString -> NonEmpty C.AAuthKeyPair -> NonEmpty (ChunkReplicaId, C.APrivateAuthKey)
+xftpRcvIdsKeys :: NonEmpty EntityId -> NonEmpty C.AAuthKeyPair -> NonEmpty (ChunkReplicaId, C.APrivateAuthKey)
 xftpRcvIdsKeys rIds rKeys = L.map ChunkReplicaId rIds `L.zip` L.map snd rKeys
 
 agentCbEncrypt :: SndQueue -> Maybe C.PublicKeyX25519 -> ByteString -> AM ByteString
@@ -1762,9 +1833,9 @@ agentCbEncryptOnce clientVersion dhRcvPubKey msg = do
 
 -- | NaCl crypto-box decrypt - both for messages received from the server
 -- and per-queue E2E encrypted messages from the sender that were inside.
-agentCbDecrypt :: C.DhSecretX25519 -> C.CbNonce -> ByteString -> AM ByteString
+agentCbDecrypt :: C.DhSecretX25519 -> C.CbNonce -> ByteString -> Either AgentErrorType ByteString
 agentCbDecrypt dhSecret nonce msg =
-  liftEither . first cryptoError $
+  first cryptoError $
     C.cbDecrypt dhSecret nonce msg
 
 cryptoError :: C.CryptoError -> AgentErrorType
@@ -1790,12 +1861,39 @@ withWork c doWork getWork action =
   withStore' c getWork >>= \case
     Right (Just r) -> action r
     Right Nothing -> noWork
+    -- worker is stopped here (noWork) because the next iteration is likely to produce the same result
     Left e@SEWorkItemError {} -> noWork >> notifyErr (CRITICAL False) e
     Left e -> notifyErr INTERNAL e
   where
     noWork = liftIO $ noWorkToDo doWork
     notifyErr err e = atomically $ writeTBQueue (subQ c) ("", "", AEvt SAEConn $ ERR $ err $ show e)
 
+withWorkItems :: AgentClient -> TMVar () -> (DB.Connection -> IO (Either StoreError [Either StoreError a])) -> (NonEmpty a -> AM ()) -> AM ()
+withWorkItems c doWork getWork action = do
+  withStore' c getWork >>= \case
+    Right [] -> noWork
+    Right rs -> do
+      let (errs, items) = partitionEithers rs
+      case L.nonEmpty items of
+        Just items' -> action items'
+        Nothing -> do
+          let criticalErr = find workItemError errs
+          forM_ criticalErr $ \err -> do
+            notifyErr (CRITICAL False) err
+            when (all workItemError errs) noWork
+      unless (null errs) $
+        atomically $
+          writeTBQueue (subQ c) ("", "", AEvt SAENone $ ERRS $ map (\e -> ("", INTERNAL $ show e)) errs)
+    Left e
+      | workItemError e -> noWork >> notifyErr (CRITICAL False) e
+      | otherwise -> notifyErr INTERNAL e
+  where
+    workItemError = \case
+      SEWorkItemError {} -> True
+      _ -> False
+    noWork = liftIO $ noWorkToDo doWork
+    notifyErr err e = atomically $ writeTBQueue (subQ c) ("", "", AEvt SAEConn $ ERR $ err $ show e)
+
 noWorkToDo :: TMVar () -> IO ()
 noWorkToDo = void . atomically . tryTakeTMVar
 {-# INLINE noWorkToDo #-}
@@ -1894,6 +1992,13 @@ withStore c action = do
   withExceptT storeError . ExceptT . liftIO . agentOperationBracket c AODatabase (\_ -> pure ()) $
     withTransaction st action `E.catches` handleDBErrors
   where
+#if defined(dbPostgres)
+    -- TODO [postgres] postgres specific error handling
+    handleDBErrors :: [E.Handler IO (Either StoreError a)]
+    handleDBErrors =
+      [ E.Handler $ \(E.SomeException e) -> pure . Left $ SEInternal $ bshow e
+      ]
+#else
     handleDBErrors :: [E.Handler IO (Either StoreError a)]
     handleDBErrors =
       [ E.Handler $ \(e :: SQL.SQLError) ->
@@ -1902,6 +2007,7 @@ withStore c action = do
            in pure . Left . (if busy then SEDatabaseBusy else SEInternal) $ bshow se,
         E.Handler $ \(E.SomeException e) -> pure . Left $ SEInternal $ bshow e
       ]
+#endif
 
 withStoreBatch :: Traversable t => AgentClient -> (DB.Connection -> t (IO (Either AgentErrorType a))) -> AM' (t (Either AgentErrorType a))
 withStoreBatch c actions = do
@@ -1920,11 +2026,12 @@ withStoreBatch' c actions = withStoreBatch c (fmap (fmap Right) . actions)
 storeError :: StoreError -> AgentErrorType
 storeError = \case
   SEConnNotFound -> CONN NOT_FOUND
+  SEUserNotFound -> NO_USER
   SERatchetNotFound -> CONN NOT_FOUND
   SEConnDuplicate -> CONN DUPLICATE
   SEBadConnType CRcv -> CONN SIMPLEX
   SEBadConnType CSnd -> CONN SIMPLEX
-  SEInvitationNotFound -> CMD PROHIBITED "SEInvitationNotFound"
+  SEInvitationNotFound cxt invId -> CMD PROHIBITED $ "SEInvitationNotFound " <> cxt <> ", invitationId = " <> show invId
   -- this error is never reported as store error,
   -- it is used to wrap agent operations when "transaction-like" store access is needed
   -- NOTE: network IO should NOT be used inside AgentStoreMonad
@@ -1938,33 +2045,82 @@ userServers c = case protocolTypeI @p of
   SPXFTP -> xftpServers c
 {-# INLINE userServers #-}
 
-pickServer :: forall p. NonEmpty (ProtoServerWithAuth p) -> AM (ProtoServerWithAuth p)
+pickServer :: NonEmpty (Maybe OperatorId, ProtoServerWithAuth p) -> AM (ProtoServerWithAuth p)
 pickServer = \case
-  srv :| [] -> pure srv
+  (_, srv) :| [] -> pure srv
   servers -> do
     gen <- asks randomServer
-    atomically $ (servers L.!!) <$> stateTVar gen (randomR (0, L.length servers - 1))
+    atomically $ snd . (servers L.!!) <$> stateTVar gen (randomR (0, L.length servers - 1))
 
-getNextServer :: forall p. (ProtocolTypeI p, UserProtocol p) => AgentClient -> UserId -> [ProtocolServer p] -> AM (ProtoServerWithAuth p)
-getNextServer c userId usedSrvs = withUserServers c userId $ \srvs ->
-  case L.nonEmpty $ deleteFirstsBy sameSrvAddr' (L.toList srvs) (map noAuthSrv usedSrvs) of
-    Just srvs' -> pickServer srvs'
-    _ -> pickServer srvs
+getNextServer ::
+  (ProtocolTypeI p, UserProtocol p) =>
+  AgentClient ->
+  UserId ->
+  (UserServers p -> NonEmpty (Maybe OperatorId, ProtoServerWithAuth p)) ->
+  [ProtocolServer p] ->
+  AM (ProtoServerWithAuth p)
+getNextServer c userId srvsSel usedSrvs = do
+  srvs <- getUserServers_ c userId srvsSel
+  snd <$> getNextServer_ srvs (usedOperatorsHosts srvs usedSrvs)
 
-withUserServers :: forall p a. (ProtocolTypeI p, UserProtocol p) => AgentClient -> UserId -> (NonEmpty (ProtoServerWithAuth p) -> AM a) -> AM a
-withUserServers c userId action =
+usedOperatorsHosts :: NonEmpty (Maybe OperatorId, ProtoServerWithAuth p) -> [ProtocolServer p] -> (Set (Maybe OperatorId), Set TransportHost)
+usedOperatorsHosts srvs usedSrvs = (usedOperators, usedHosts)
+  where
+    usedHosts = S.unions $ map serverHosts usedSrvs
+    usedOperators = S.fromList $ mapMaybe usedOp $ L.toList srvs
+    usedOp (op, srv) = if hasUsedHost srv then Just op else Nothing
+    hasUsedHost (ProtoServerWithAuth srv _) = any (`S.member` usedHosts) $ serverHosts srv
+
+getNextServer_ ::
+  (ProtocolTypeI p, UserProtocol p) =>
+  NonEmpty (Maybe OperatorId, ProtoServerWithAuth p) ->
+  (Set (Maybe OperatorId), Set TransportHost) ->
+  AM (NonEmpty (Maybe OperatorId, ProtoServerWithAuth p), ProtoServerWithAuth p)
+getNextServer_ servers (usedOperators, usedHosts) = do
+  -- choose from servers of unused operators, when possible
+  let otherOpsSrvs = filterOrAll ((`S.notMember` usedOperators) . fst) servers
+      -- choose from servers with unused hosts when possible
+      unusedSrvs = filterOrAll (isUnusedServer usedHosts) otherOpsSrvs
+  (otherOpsSrvs,) <$> pickServer unusedSrvs
+  where
+    filterOrAll p srvs = fromMaybe srvs $ L.nonEmpty $ L.filter p srvs
+
+isUnusedServer :: Set TransportHost -> (Maybe OperatorId, ProtoServerWithAuth p) -> Bool
+isUnusedServer usedHosts (_, ProtoServerWithAuth ProtocolServer {host} _) = all (`S.notMember` usedHosts) host
+
+getUserServers_ ::
+  (ProtocolTypeI p, UserProtocol p) =>
+  AgentClient ->
+  UserId ->
+  (UserServers p -> NonEmpty (Maybe OperatorId, ProtoServerWithAuth p)) ->
+  AM (NonEmpty (Maybe OperatorId, ProtoServerWithAuth p))
+getUserServers_ c userId srvsSel =
   liftIO (TM.lookupIO userId $ userServers c) >>= \case
-    Just srvs -> action $ enabledSrvs srvs
+    Just srvs -> pure $ srvsSel srvs
     _ -> throwE $ INTERNAL "unknown userId - no user servers"
 
-withNextSrv :: forall p a. (ProtocolTypeI p, UserProtocol p) => AgentClient -> UserId -> TVar [ProtocolServer p] -> [ProtocolServer p] -> (ProtoServerWithAuth p -> AM a) -> AM a
-withNextSrv c userId usedSrvs initUsed action = do
-  used <- readTVarIO usedSrvs
-  srvAuth@(ProtoServerWithAuth srv _) <- getNextServer c userId used
-  srvs_ <- liftIO $ TM.lookupIO userId $ userServers c
-  let unused = maybe [] ((\\ used) . map protoServer . L.toList . enabledSrvs) srvs_
-      used' = if null unused then initUsed else srv : used
-  atomically $ writeTVar usedSrvs $! used'
+-- This function checks used servers and operators every time to allow
+-- changing configuration while retry look is executing.
+-- This function is not thread safe.
+withNextSrv ::
+  (ProtocolTypeI p, UserProtocol p) =>
+  AgentClient ->
+  UserId ->
+  (UserServers p -> NonEmpty (Maybe OperatorId, ProtoServerWithAuth p)) ->
+  TVar (Set TransportHost) ->
+  [ProtocolServer p] ->
+  (ProtoServerWithAuth p -> AM a) ->
+  AM a
+withNextSrv c userId srvsSel triedHosts usedSrvs action = do
+  srvs <- getUserServers_ c userId srvsSel
+  let (usedOperators, usedHosts) = usedOperatorsHosts srvs usedSrvs
+  tried <- readTVarIO triedHosts
+  let triedOrUsed = S.union tried usedHosts
+  (otherOpsSrvs, srvAuth@(ProtoServerWithAuth srv _)) <- getNextServer_ srvs (usedOperators, triedOrUsed)
+  let newHosts = serverHosts srv
+      unusedSrvs = L.filter (isUnusedServer $ S.union triedOrUsed newHosts) otherOpsSrvs
+      !tried' = if null unusedSrvs then S.empty else S.union tried newHosts
+  atomically $ writeTVar triedHosts tried'
   action srvAuth
 
 incSMPServerStat :: AgentClient -> UserId -> SMPServer -> (AgentSMPServerStats -> TVar Int) -> STM ()
@@ -1990,9 +2146,13 @@ incXFTPServerStat_ = incServerStat (\AgentClient {xftpServersStats = s} -> s) ne
 {-# INLINE incXFTPServerStat_ #-}
 
 incNtfServerStat :: AgentClient -> UserId -> NtfServer -> (AgentNtfServerStats -> TVar Int) -> STM ()
-incNtfServerStat c userId srv sel = incServerStat (\AgentClient {ntfServersStats = s} -> s) newAgentNtfServerStats c userId srv sel 1
+incNtfServerStat c userId srv sel = incNtfServerStat' c userId srv sel 1
 {-# INLINE incNtfServerStat #-}
 
+incNtfServerStat' :: AgentClient -> UserId -> NtfServer -> (AgentNtfServerStats -> TVar Int) -> Int -> STM ()
+incNtfServerStat' = incServerStat (\AgentClient {ntfServersStats = s} -> s) newAgentNtfServerStats
+{-# INLINE incNtfServerStat' #-}
+
 incServerStat :: Num n => (AgentClient -> TMap (UserId, ProtocolServer p) s) -> STM s -> AgentClient -> UserId -> ProtocolServer p -> (s -> TVar n) -> n -> STM ()
 incServerStat statsSel mkNewStats c userId srv sel n = do
   TM.lookup (userId, srv) (statsSel c) >>= \case

src/Simplex/Messaging/Agent/Env/SQLite.hs

@@ -17,11 +17,14 @@ module Simplex.Messaging.Agent.Env.SQLite
     AgentConfig (..),
     InitialAgentServers (..),
     ServerCfg (..),
+    ServerRoles (..),
+    OperatorId,
     UserServers (..),
     NetworkConfig (..),
     presetServerCfg,
-    enabledServerCfg,
+    allRoles,
     mkUserServers,
+    serverHosts,
     defaultAgentConfig,
     defaultReconnectInterval,
     tryAgentError,
@@ -42,18 +45,20 @@ module Simplex.Messaging.Agent.Env.SQLite
 where
 
 import Control.Concurrent (ThreadId)
+import Control.Exception (BlockedIndefinitelyOnSTM (..), SomeException, fromException)
 import Control.Monad.Except
 import Control.Monad.IO.Unlift
 import Control.Monad.Reader
 import Crypto.Random
 import Data.Aeson (FromJSON (..), ToJSON (..))
 import qualified Data.Aeson.TH as JQ
-import Data.ByteArray (ScrubbedBytes)
 import Data.Int (Int64)
 import Data.List.NonEmpty (NonEmpty)
 import qualified Data.List.NonEmpty as L
 import Data.Map.Strict (Map)
 import Data.Maybe (fromMaybe)
+import Data.Set (Set)
+import qualified Data.Set as S
 import Data.Time.Clock (NominalDiffTime, nominalDay)
 import Data.Time.Clock.System (SystemTime (..))
 import Data.Word (Word16)
@@ -62,8 +67,10 @@ import Numeric.Natural
 import Simplex.FileTransfer.Client (XFTPClientConfig (..), defaultXFTPClientConfig)
 import Simplex.Messaging.Agent.Protocol
 import Simplex.Messaging.Agent.RetryInterval
-import Simplex.Messaging.Agent.Store.SQLite
-import qualified Simplex.Messaging.Agent.Store.SQLite.Migrations as Migrations
+import Simplex.Messaging.Agent.Store (createStore)
+import Simplex.Messaging.Agent.Store.Common (DBStore)
+import Simplex.Messaging.Agent.Store.Interface (DBOpts)
+import Simplex.Messaging.Agent.Store.Shared (MigrationConfirmation (..), MigrationError (..))
 import Simplex.Messaging.Client
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Crypto.Ratchet (VersionRangeE2E, supportedE2EEncryptVRange)
@@ -71,15 +78,14 @@ import Simplex.Messaging.Notifications.Client (defaultNTFClientConfig)
 import Simplex.Messaging.Notifications.Transport (NTFVersion)
 import Simplex.Messaging.Notifications.Types
 import Simplex.Messaging.Parsers (defaultJSON)
-import Simplex.Messaging.Protocol (NtfServer, ProtoServerWithAuth, ProtocolServer, ProtocolType (..), ProtocolTypeI, VersionRangeSMPC, XFTPServer, supportedSMPClientVRange)
+import Simplex.Messaging.Protocol (NtfServer, ProtoServerWithAuth (..), ProtocolServer (..), ProtocolType (..), ProtocolTypeI, VersionRangeSMPC, XFTPServer, supportedSMPClientVRange)
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
-import Simplex.Messaging.Transport (SMPVersion, TLS, Transport (..))
-import Simplex.Messaging.Transport.Client (defaultSMPPort)
+import Simplex.Messaging.Transport (SMPVersion)
+import Simplex.Messaging.Transport.Client (TransportHost)
 import Simplex.Messaging.Util (allFinally, catchAllErrors, catchAllErrors', tryAllErrors, tryAllErrors')
 import System.Mem.Weak (Weak)
 import System.Random (StdGen, newStdGen)
-import UnliftIO (SomeException)
 import UnliftIO.STM
 
 type AM' a = ReaderT Env IO a
@@ -95,29 +101,42 @@ data InitialAgentServers = InitialAgentServers
 
 data ServerCfg p = ServerCfg
   { server :: ProtoServerWithAuth p,
-    preset :: Bool,
-    tested :: Maybe Bool,
-    enabled :: Bool
+    operator :: Maybe OperatorId,
+    enabled :: Bool,
+    roles :: ServerRoles
   }
   deriving (Show)
 
-enabledServerCfg :: ProtoServerWithAuth p -> ServerCfg p
-enabledServerCfg server = ServerCfg {server, preset = False, tested = Nothing, enabled = True}
+data ServerRoles = ServerRoles
+  { storage :: Bool,
+    proxy :: Bool
+  }
+  deriving (Show)
 
-presetServerCfg :: Bool -> ProtoServerWithAuth p -> ServerCfg p
-presetServerCfg enabled server = ServerCfg {server, preset = True, tested = Nothing, enabled}
+allRoles :: ServerRoles
+allRoles = ServerRoles True True
+
+presetServerCfg :: Bool -> ServerRoles -> Maybe OperatorId -> ProtoServerWithAuth p -> ServerCfg p
+presetServerCfg enabled roles operator server =
+  ServerCfg {server, operator, enabled, roles}
 
 data UserServers p = UserServers
-  { enabledSrvs :: NonEmpty (ProtoServerWithAuth p),
-    knownSrvs :: NonEmpty (ProtocolServer p)
+  { storageSrvs :: NonEmpty (Maybe OperatorId, ProtoServerWithAuth p),
+    proxySrvs :: NonEmpty (Maybe OperatorId, ProtoServerWithAuth p),
+    knownHosts :: Set TransportHost
   }
 
+type OperatorId = Int64
+
 -- This function sets all servers as enabled in case all passed servers are disabled.
 mkUserServers :: NonEmpty (ServerCfg p) -> UserServers p
-mkUserServers srvs = UserServers {enabledSrvs, knownSrvs}
+mkUserServers srvs = UserServers {storageSrvs = filterSrvs storage, proxySrvs = filterSrvs proxy, knownHosts}
   where
-    enabledSrvs = L.map (\ServerCfg {server} -> server) $ fromMaybe srvs $ L.nonEmpty $ L.filter (\ServerCfg {enabled} -> enabled) srvs
-    knownSrvs = L.map (\ServerCfg {server = ProtoServerWithAuth srv _} -> srv) srvs
+    filterSrvs role = L.map (\ServerCfg {operator, server} -> (operator, server)) $ fromMaybe srvs $ L.nonEmpty $ L.filter (\ServerCfg {enabled, roles} -> enabled && role roles) srvs
+    knownHosts = S.unions $ L.map (\ServerCfg {server = ProtoServerWithAuth srv _} -> serverHosts srv) srvs
+
+serverHosts :: ProtocolServer p -> Set TransportHost
+serverHosts ProtocolServer {host} = S.fromList $ L.toList host
 
 data AgentConfig = AgentConfig
   { tcpPort :: Maybe ServiceName,
@@ -150,6 +169,8 @@ data AgentConfig = AgentConfig
     xftpMaxRecipientsPerRequest :: Int,
     deleteErrorCount :: Int,
     ntfCron :: Word16,
+    ntfBatchSize :: Int,
+    ntfSubFirstCheckInterval :: NominalDiffTime,
     ntfSubCheckInterval :: NominalDiffTime,
     caCertificateFile :: FilePath,
     privateKeyFile :: FilePath,
@@ -193,9 +214,9 @@ defaultAgentConfig =
       rcvAuthAlg = C.AuthAlg C.SEd25519, -- this will stay as Ed25519
       sndAuthAlg = C.AuthAlg C.SEd25519, -- TODO replace with X25519 when switching to v7
       connIdBytes = 12,
-      tbqSize = 64,
-      smpCfg = defaultSMPClientConfig {defaultTransport = (show defaultSMPPort, transport @TLS)},
-      ntfCfg = defaultNTFClientConfig {defaultTransport = ("443", transport @TLS)},
+      tbqSize = 128,
+      smpCfg = defaultSMPClientConfig,
+      ntfCfg = defaultNTFClientConfig,
       xftpCfg = defaultXFTPClientConfig,
       reconnectInterval = defaultReconnectInterval,
       messageRetryInterval = defaultMessageRetryInterval,
@@ -219,7 +240,9 @@ defaultAgentConfig =
       xftpMaxRecipientsPerRequest = 200,
       deleteErrorCount = 10,
       ntfCron = 20, -- minutes
-      ntfSubCheckInterval = nominalDay,
+      ntfBatchSize = 150,
+      ntfSubFirstCheckInterval = nominalDay,
+      ntfSubCheckInterval = 3 * nominalDay,
       -- CA certificate private key is not needed for initialization
       -- ! we do not generate these
       caCertificateFile = "/etc/opt/simplex-agent/ca.crt",
@@ -232,7 +255,7 @@ defaultAgentConfig =
 
 data Env = Env
   { config :: AgentConfig,
-    store :: SQLiteStore,
+    store :: DBStore,
     random :: TVar ChaChaDRG,
     randomServer :: TVar StdGen,
     ntfSupervisor :: NtfSupervisor,
@@ -240,7 +263,7 @@ data Env = Env
     multicastSubscribers :: TMVar Int
   }
 
-newSMPAgentEnv :: AgentConfig -> SQLiteStore -> IO Env
+newSMPAgentEnv :: AgentConfig -> DBStore -> IO Env
 newSMPAgentEnv config store = do
   random <- C.newRandom
   randomServer <- newTVarIO =<< liftIO newStdGen
@@ -249,17 +272,18 @@ newSMPAgentEnv config store = do
   multicastSubscribers <- newTMVarIO 0
   pure Env {config, store, random, randomServer, ntfSupervisor, xftpAgent, multicastSubscribers}
 
-createAgentStore :: FilePath -> ScrubbedBytes -> Bool -> MigrationConfirmation -> IO (Either MigrationError SQLiteStore)
-createAgentStore dbFilePath dbKey keepKey = createSQLiteStore dbFilePath dbKey keepKey Migrations.app
+createAgentStore :: DBOpts -> MigrationConfirmation -> IO (Either MigrationError DBStore)
+createAgentStore = createStore
 
 data NtfSupervisor = NtfSupervisor
   { ntfTkn :: TVar (Maybe NtfToken),
-    ntfSubQ :: TBQueue (ConnId, NtfSupervisorCommand),
+    ntfSubQ :: TBQueue (NtfSupervisorCommand, NonEmpty ConnId),
     ntfWorkers :: TMap NtfServer Worker,
-    ntfSMPWorkers :: TMap SMPServer Worker
+    ntfSMPWorkers :: TMap SMPServer Worker,
+    ntfTknDelWorkers :: TMap NtfServer Worker
   }
 
-data NtfSupervisorCommand = NSCCreate | NSCDelete | NSCSmpDelete | NSCNtfWorker NtfServer | NSCNtfSMPWorker SMPServer
+data NtfSupervisorCommand = NSCCreate | NSCSmpDelete | NSCDeleteSub
   deriving (Show)
 
 newNtfSubSupervisor :: Natural -> IO NtfSupervisor
@@ -268,7 +292,8 @@ newNtfSubSupervisor qSize = do
   ntfSubQ <- newTBQueueIO qSize
   ntfWorkers <- TM.emptyIO
   ntfSMPWorkers <- TM.emptyIO
-  pure NtfSupervisor {ntfTkn, ntfSubQ, ntfWorkers, ntfSMPWorkers}
+  ntfTknDelWorkers <- TM.emptyIO
+  pure NtfSupervisor {ntfTkn, ntfSubQ, ntfWorkers, ntfSMPWorkers, ntfTknDelWorkers}
 
 data XFTPAgent = XFTPAgent
   { -- if set, XFTP file paths will be considered as relative to this directory
@@ -308,7 +333,9 @@ agentFinally = allFinally mkInternal
 {-# INLINE agentFinally #-}
 
 mkInternal :: SomeException -> AgentErrorType
-mkInternal = INTERNAL . show
+mkInternal e = case fromException e of
+  Just BlockedIndefinitelyOnSTM -> CRITICAL True "Thread blocked indefinitely in STM transaction"
+  _ -> INTERNAL $ show e
 {-# INLINE mkInternal #-}
 
 data Worker = Worker
@@ -330,6 +357,8 @@ updateRestartCount t (RestartCount minute count) = do
 
 $(pure [])
 
+$(JQ.deriveJSON defaultJSON ''ServerRoles)
+
 instance ProtocolTypeI p => ToJSON (ServerCfg p) where
   toEncoding = $(JQ.mkToEncoding defaultJSON ''ServerCfg)
   toJSON = $(JQ.mkToJSON defaultJSON ''ServerCfg)

src/Simplex/Messaging/Agent/Lock.hs

@@ -1,6 +1,7 @@
 module Simplex.Messaging.Agent.Lock
   ( Lock,
     createLock,
+    createLockIO,
     withLock,
     withLock',
     withGetLock,
@@ -24,6 +25,10 @@ createLock :: STM Lock
 createLock = newEmptyTMVar
 {-# INLINE createLock #-}
 
+createLockIO :: IO Lock
+createLockIO = newEmptyTMVarIO
+{-# INLINE createLockIO #-}
+
 withLock :: MonadUnliftIO m => Lock -> String -> ExceptT e m a -> ExceptT e m a
 withLock lock name = ExceptT . withLock' lock name . runExceptT
 {-# INLINE withLock #-}

src/Simplex/Messaging/Agent/NtfSubSupervisor.hs

@@ -1,7 +1,9 @@
+{-# LANGUAGE DataKinds #-}
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedLists #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TupleSections #-}
@@ -13,6 +15,7 @@ module Simplex.Messaging.Agent.NtfSubSupervisor
     nsRemoveNtfToken,
     sendNtfSubCommand,
     instantNotifications,
+    deleteToken,
     closeNtfSupervisor,
     getNtfServer,
   )
@@ -22,23 +25,32 @@ import Control.Logger.Simple (logError, logInfo)
 import Control.Monad
 import Control.Monad.Reader
 import Control.Monad.Trans.Except
+import Crypto.Random (ChaChaDRG)
 import Data.Bifunctor (first)
+import Data.Either (fromRight, partitionEithers)
+import Data.Functor (($>))
+import Data.List (foldl')
+import Data.List.NonEmpty (NonEmpty (..))
+import qualified Data.List.NonEmpty as L
 import qualified Data.Map.Strict as M
-import Data.Text (Text)
+import Data.Maybe (catMaybes)
+import qualified Data.Set as S
 import Data.Time (UTCTime, addUTCTime, getCurrentTime)
 import Data.Time.Clock (diffUTCTime)
 import Simplex.Messaging.Agent.Client
 import Simplex.Messaging.Agent.Env.SQLite
-import Simplex.Messaging.Agent.Protocol (AEvent (..), AEvt (..), AgentErrorType (..), BrokerErrorType (..), ConnId, NotificationsMode (..), SAEntity (..))
+import Simplex.Messaging.Agent.Protocol
 import Simplex.Messaging.Agent.RetryInterval
 import Simplex.Messaging.Agent.Stats
 import Simplex.Messaging.Agent.Store
-import Simplex.Messaging.Agent.Store.SQLite
+import Simplex.Messaging.Agent.Store.AgentStore
+import qualified Simplex.Messaging.Agent.Store.DB as DB
 import qualified Simplex.Messaging.Crypto as C
-import Simplex.Messaging.Notifications.Protocol (NtfSubStatus (..), NtfTknStatus (..), SMPQueueNtf (..))
+import Simplex.Messaging.Notifications.Protocol
 import Simplex.Messaging.Notifications.Types
-import Simplex.Messaging.Protocol (NtfServer, SMPServer, sameSrvAddr)
-import Simplex.Messaging.Util (diffToMicroseconds, threadDelay', tshow, unlessM)
+import Simplex.Messaging.Protocol (NtfServer, sameSrvAddr)
+import qualified Simplex.Messaging.Protocol as SMP
+import Simplex.Messaging.Util (diffToMicroseconds, threadDelay', tshow)
 import System.Random (randomR)
 import UnliftIO
 import UnliftIO.Concurrent (forkIO)
@@ -47,91 +59,134 @@ import qualified UnliftIO.Exception as E
 runNtfSupervisor :: AgentClient -> AM' ()
 runNtfSupervisor c = do
   ns <- asks ntfSupervisor
+  runExceptT startTknDelete >>= \case
+    Left e -> notifyErr e
+    Right _ -> pure ()
   forever $ do
-    cmd@(connId, _) <- atomically . readTBQueue $ ntfSubQ ns
-    handleErr connId . agentOperationBracket c AONtfNetwork waitUntilActive $
-      runExceptT (processNtfSub c cmd) >>= \case
-        Left e -> notifyErr connId e
+    cmd <- atomically . readTBQueue $ ntfSubQ ns
+    handleErr . agentOperationBracket c AONtfNetwork waitUntilActive $
+      runExceptT (processNtfCmd c cmd) >>= \case
+        Left e -> notifyErr e
         Right _ -> return ()
   where
-    handleErr :: ConnId -> AM' () -> AM' ()
-    handleErr connId = E.handle $ \(e :: E.SomeException) -> do
+    startTknDelete :: AM ()
+    startTknDelete = do
+      pendingDelServers <- withStore' c getPendingDelTknServers
+      lift . forM_ pendingDelServers $ getNtfTknDelWorker True c
+    handleErr :: AM' () -> AM' ()
+    handleErr = E.handle $ \(e :: E.SomeException) -> do
       logError $ "runNtfSupervisor error " <> tshow e
-      notifyErr connId e
-    notifyErr connId e = notifyInternalError c connId $ "runNtfSupervisor error " <> show e
+      notifyErr e
+    notifyErr e = notifyInternalError' c $ "runNtfSupervisor error " <> show e
 
-processNtfSub :: AgentClient -> (ConnId, NtfSupervisorCommand) -> AM ()
-processNtfSub c (connId, cmd) = do
-  logInfo $ "processNtfSub - connId = " <> tshow connId <> " - cmd = " <> tshow cmd
+partitionErrs :: (a -> ConnId) -> [a] -> [Either AgentErrorType b] -> ([(ConnId, AgentErrorType)], [b])
+partitionErrs f xs = partitionEithers . zipWith (\x -> first (f x,)) xs
+{-# INLINE partitionErrs #-}
+
+ntfSubConnId :: NtfSubscription -> ConnId
+ntfSubConnId NtfSubscription {connId} = connId
+
+processNtfCmd :: AgentClient -> (NtfSupervisorCommand, NonEmpty ConnId) -> AM ()
+processNtfCmd c (cmd, connIds) = do
+  logInfo $ "processNtfCmd - cmd = " <> tshow cmd
+  let connIds' = L.toList connIds
   case cmd of
     NSCCreate -> do
-      (a, RcvQueue {userId, server = smpServer, clientNtfCreds}) <- withStore c $ \db -> runExceptT $ do
-        a <- liftIO $ getNtfSubscription db connId
-        q <- ExceptT $ getPrimaryRcvQueue db connId
-        pure (a, q)
-      logInfo $ "processNtfSub, NSCCreate - a = " <> tshow a
-      case a of
-        Nothing -> do
+      (cErrs, rqSubActions) <- lift $ partitionErrs id connIds' <$> withStoreBatch c (\db -> map (getQueueSub db) connIds')
+      notifyErrs c cErrs
+      logInfo $ "processNtfCmd, NSCCreate - length rqSubs = " <> tshow (length rqSubActions)
+      let (ns, rs, css, cns) = partitionQueueSubActions rqSubActions
+      createNewSubs ns
+      resetSubs rs
+      lift $ do
+        mapM_ (getNtfSMPWorker True c) (S.fromList css)
+        mapM_ (getNtfNTFWorker True c) (S.fromList cns)
+      where
+        getQueueSub ::
+          DB.Connection ->
+          ConnId ->
+          IO (Either AgentErrorType (RcvQueue, Maybe NtfSupervisorSub))
+        getQueueSub db connId = fmap (first storeError) $ runExceptT $ do
+          rq <- ExceptT $ getPrimaryRcvQueue db connId
+          sub <- liftIO $ getNtfSubscription db connId
+          pure (rq, sub)
+        createNewSubs :: [RcvQueue] -> AM ()
+        createNewSubs rqs = do
           withTokenServer $ \ntfServer -> do
-            case clientNtfCreds of
-              Just ClientNtfCreds {notifierId} -> do
-                let newSub = newNtfSubscription userId connId smpServer (Just notifierId) ntfServer NASKey
-                withStore c $ \db -> createNtfSubscription db newSub $ NSANtf NSACreate
-                lift . void $ getNtfNTFWorker True c ntfServer
-              Nothing -> do
-                let newSub = newNtfSubscription userId connId smpServer Nothing ntfServer NASNew
-                withStore c $ \db -> createNtfSubscription db newSub $ NSASMP NSASmpKey
-                lift . void $ getNtfSMPWorker True c smpServer
-        (Just (sub@NtfSubscription {ntfSubStatus, ntfServer = subNtfServer, smpServer = smpServer', ntfQueueId}, action_)) -> do
-          case (clientNtfCreds, ntfQueueId) of
-            (Just ClientNtfCreds {notifierId}, Just ntfQueueId')
-              | sameSrvAddr smpServer smpServer' && notifierId == ntfQueueId' -> create
-              | otherwise -> rotate
-            (Nothing, Nothing) -> create
-            _ -> rotate
+            let newSubs = map (rqToNewSub ntfServer) rqs
+            (cErrs, _) <- lift $ partitionErrs ntfSubConnId newSubs <$> withStoreBatch c (\db -> map (storeNewSub db) newSubs)
+            notifyErrs c cErrs
+            kickSMPWorkers rqs
           where
-            create :: AM ()
-            create = case action_ of
-              -- action was set to NULL after worker internal error
-              Nothing -> resetSubscription
-              Just (action, _)
-                -- subscription was marked for deletion / is being deleted
-                | isDeleteNtfSubAction action -> do
-                    if ntfSubStatus == NASNew || ntfSubStatus == NASOff || ntfSubStatus == NASDeleted
-                      then resetSubscription
-                      else withTokenServer $ \ntfServer -> do
-                        withStore' c $ \db -> supervisorUpdateNtfSub db sub {ntfServer} (NSANtf NSACreate)
-                        lift . void $ getNtfNTFWorker True c ntfServer
-                | otherwise -> case action of
-                    NSANtf _ -> lift . void $ getNtfNTFWorker True c subNtfServer
-                    NSASMP _ -> lift . void $ getNtfSMPWorker True c smpServer
-            rotate :: AM ()
-            rotate = do
-              withStore' c $ \db -> supervisorUpdateNtfSub db sub (NSANtf NSARotate)
-              lift . void $ getNtfNTFWorker True c subNtfServer
-            resetSubscription :: AM ()
-            resetSubscription =
-              withTokenServer $ \ntfServer -> do
-                let sub' = sub {ntfQueueId = Nothing, ntfServer, ntfSubId = Nothing, ntfSubStatus = NASNew}
-                withStore' c $ \db -> supervisorUpdateNtfSub db sub' (NSASMP NSASmpKey)
-                lift . void $ getNtfSMPWorker True c smpServer
-    NSCDelete -> do
-      sub_ <- withStore' c $ \db -> do
-        supervisorUpdateNtfAction db connId (NSANtf NSADelete)
-        getNtfSubscription db connId
-      logInfo $ "processNtfSub, NSCDelete - sub_ = " <> tshow sub_
-      case sub_ of
-        (Just (NtfSubscription {ntfServer}, _)) -> lift . void $ getNtfNTFWorker True c ntfServer
-        _ -> pure () -- err "NSCDelete - no subscription"
+            rqToNewSub :: NtfServer -> RcvQueue -> NtfSubscription
+            rqToNewSub ntfServer RcvQueue {userId, connId, server} = newNtfSubscription userId connId server Nothing ntfServer NASNew
+            storeNewSub :: DB.Connection -> NtfSubscription -> IO (Either AgentErrorType ())
+            storeNewSub db sub = first storeError <$> createNtfSubscription db sub (NSASMP NSASmpKey)
+        resetSubs :: [(RcvQueue, NtfSubscription)] -> AM ()
+        resetSubs rqSubs = do
+          withTokenServer $ \ntfServer -> do
+            let subsToReset = map (toResetSub ntfServer) rqSubs
+            (cErrs, _) <- lift $ partitionErrs ntfSubConnId subsToReset <$> withStoreBatch' c (\db -> map (storeResetSub db) subsToReset)
+            notifyErrs c cErrs
+            let rqs = map fst rqSubs
+            kickSMPWorkers rqs
+          where
+            toResetSub :: NtfServer -> (RcvQueue, NtfSubscription) -> NtfSubscription
+            toResetSub ntfServer (rq, sub) =
+              let RcvQueue {server = smpServer} = rq
+               in sub {smpServer, ntfQueueId = Nothing, ntfServer, ntfSubId = Nothing, ntfSubStatus = NASNew}
+            storeResetSub :: DB.Connection -> NtfSubscription -> IO ()
+            storeResetSub db sub = supervisorUpdateNtfSub db sub (NSASMP NSASmpKey)
+        partitionQueueSubActions ::
+          [(RcvQueue, Maybe NtfSupervisorSub)] ->
+          ( [RcvQueue], -- new subs
+            [(RcvQueue, NtfSubscription)], -- reset subs
+            [SMPServer], -- continue work (SMP)
+            [NtfServer] -- continue work (Ntf)
+          )
+        partitionQueueSubActions = foldr decideSubWork ([], [], [], [])
+          where
+            -- sub = Nothing, needs to be created
+            decideSubWork (rq, Nothing) (ns, rs, css, cns) = (rq : ns, rs, css, cns)
+            decideSubWork (rq, Just (sub, subAction_)) (ns, rs, css, cns) =
+              case (clientNtfCreds rq, ntfQueueId sub) of
+                -- notifier ID created on SMP server (on ntf server subscription can be registered or not yet),
+                -- need to clarify action
+                (Just ClientNtfCreds {notifierId}, Just ntfQueueId')
+                  | sameSrvAddr (qServer rq) subSMPServer && notifierId == ntfQueueId' -> contOrReset
+                  | otherwise -> reset
+                (Nothing, Nothing) -> contOrReset
+                _ -> reset
+              where
+                NtfSubscription {ntfServer = subNtfServer, smpServer = subSMPServer} = sub
+                contOrReset = case subAction_ of
+                  -- action was set to NULL after worker internal error
+                  Nothing -> reset
+                  Just (action, _)
+                    -- subscription was marked for deletion / is being deleted
+                    | isDeleteNtfSubAction action -> reset
+                    -- continue work on subscription (e.g. supervisor was repeatedly tasked with creating a subscription)
+                    | otherwise -> case action of
+                        NSASMP _ -> (ns, rs, qServer rq : css, cns)
+                        NSANtf _ -> (ns, rs, css, subNtfServer : cns)
+                reset = (ns, (rq, sub) : rs, css, cns)
     NSCSmpDelete -> do
-      withStore' c (`getPrimaryRcvQueue` connId) >>= \case
-        Right rq@RcvQueue {server = smpServer} -> do
-          logInfo $ "processNtfSub, NSCSmpDelete - rq = " <> tshow rq
-          withStore' c $ \db -> supervisorUpdateNtfAction db connId (NSASMP NSASmpDelete)
-          lift . void $ getNtfSMPWorker True c smpServer
-        _ -> notifyInternalError c connId "NSCSmpDelete - no rcv queue"
-    NSCNtfWorker ntfServer -> lift . void $ getNtfNTFWorker True c ntfServer
-    NSCNtfSMPWorker smpServer -> lift . void $ getNtfSMPWorker True c smpServer
+      (cErrs, rqs) <- lift $ partitionErrs id connIds' <$> withStoreBatch c (\db -> map (getQueue db) connIds')
+      logInfo $ "processNtfCmd, NSCSmpDelete - length rqs = " <> tshow (length rqs)
+      (cErrs', _) <- lift $ partitionErrs qConnId rqs <$> withStoreBatch' c (\db -> map (updateAction db) rqs)
+      notifyErrs c (cErrs <> cErrs')
+      kickSMPWorkers rqs
+      where
+        getQueue :: DB.Connection -> ConnId -> IO (Either AgentErrorType RcvQueue)
+        getQueue db connId = first storeError <$> getPrimaryRcvQueue db connId
+        updateAction :: DB.Connection -> RcvQueue -> IO ()
+        updateAction db rq = supervisorUpdateNtfAction db (qConnId rq) (NSASMP NSASmpDelete)
+    NSCDeleteSub -> void $ lift $ withStoreBatch' c $ \db -> map (deleteNtfSubscription' db) connIds'
+  where
+    kickSMPWorkers :: [RcvQueue] -> AM ()
+    kickSMPWorkers rqs = do
+      let smpServers = S.fromList $ map qServer rqs
+      lift $ mapM_ (getNtfSMPWorker True c) smpServers
 
 getNtfNTFWorker :: Bool -> AgentClient -> NtfServer -> AM' Worker
 getNtfNTFWorker hasWork c server = do
@@ -143,6 +198,11 @@ getNtfSMPWorker hasWork c server = do
   ws <- asks $ ntfSMPWorkers . ntfSupervisor
   getAgentWorker "ntf_smp" hasWork c server ws $ runNtfSMPWorker c server
 
+getNtfTknDelWorker :: Bool -> AgentClient -> NtfServer -> AM' Worker
+getNtfTknDelWorker hasWork c server = do
+  ws <- asks $ ntfTknDelWorkers . ntfSupervisor
+  getAgentWorker "ntf_tkn_del" hasWork c server ws $ runNtfTknDelWorker c server
+
 withTokenServer :: (NtfServer -> AM ()) -> AM ()
 withTokenServer action = lift getNtfToken >>= mapM_ (\NtfToken {ntfServer} -> action ntfServer)
 
@@ -153,153 +213,288 @@ runNtfWorker c srv Worker {doWork} =
     ExceptT $ agentOperationBracket c AONtfNetwork throwWhenInactive $ runExceptT runNtfOperation
   where
     runNtfOperation :: AM ()
-    runNtfOperation =
-      withWork c doWork (`getNextNtfSubNTFAction` srv) $
-        \nextSub@(NtfSubscription {connId}, _, _) -> do
-          logInfo $ "runNtfWorker, nextSub " <> tshow nextSub
-          ri <- asks $ reconnectInterval . config
-          withRetryInterval ri $ \_ loop -> do
-            liftIO $ waitWhileSuspended c
-            liftIO $ waitForUserNetwork c
-            processSub nextSub
-              `catchAgentError` retryOnError c "NtfWorker" loop (workerInternalError c connId . show)
-    processSub :: (NtfSubscription, NtfSubNTFAction, NtfActionTs) -> AM ()
-    processSub (sub@NtfSubscription {userId, connId, smpServer, ntfSubId}, action, actionTs) = do
-      ts <- liftIO getCurrentTime
-      unlessM (lift $ rescheduleAction doWork ts actionTs) $
-        case action of
-          NSACreate ->
-            lift getNtfToken >>= \case
-              Just tkn@NtfToken {ntfServer, ntfTokenId = Just tknId, ntfTknStatus = NTActive, ntfMode = NMInstant} -> do
-                RcvQueue {clientNtfCreds} <- withStore c (`getPrimaryRcvQueue` connId)
-                case clientNtfCreds of
-                  Just ClientNtfCreds {ntfPrivateKey, notifierId} -> do
-                    atomically $ incNtfServerStat c userId ntfServer ntfCreateAttempts
-                    nSubId <- agentNtfCreateSubscription c tknId tkn (SMPQueueNtf smpServer notifierId) ntfPrivateKey
-                    atomically $ incNtfServerStat c userId ntfServer ntfCreated
-                    -- possible improvement: smaller retry until Active, less frequently (daily?) once Active
-                    let actionTs' = addUTCTime 30 ts
-                    withStore' c $ \db ->
-                      updateNtfSubscription db sub {ntfSubId = Just nSubId, ntfSubStatus = NASCreated NSNew} (NSANtf NSACheck) actionTs'
-                  _ -> workerInternalError c connId "NSACreate - no notifier queue credentials"
-              _ -> workerInternalError c connId "NSACreate - no active token"
-          NSACheck ->
-            lift getNtfToken >>= \case
-              Just tkn@NtfToken {ntfServer} ->
-                case ntfSubId of
-                  Just nSubId -> do
-                    atomically $ incNtfServerStat c userId ntfServer ntfCheckAttempts
-                    agentNtfCheckSubscription c nSubId tkn >>= \case
-                      NSAuth -> do
-                        withStore' c $ \db ->
-                          updateNtfSubscription db sub {ntfServer, ntfQueueId = Nothing, ntfSubId = Nothing, ntfSubStatus = NASNew} (NSASMP NSASmpKey) ts
-                        ns <- asks ntfSupervisor
-                        atomically $ writeTBQueue (ntfSubQ ns) (connId, NSCNtfSMPWorker smpServer)
-                      status -> updateSubNextCheck ts status
-                    atomically $ incNtfServerStat c userId ntfServer ntfChecked
-                  Nothing -> workerInternalError c connId "NSACheck - no subscription ID"
-              _ -> workerInternalError c connId "NSACheck - no active token"
-          NSADelete ->
-            deleteNtfSub $ do
-              let sub' = sub {ntfSubId = Nothing, ntfSubStatus = NASOff}
-              withStore' c $ \db -> updateNtfSubscription db sub' (NSASMP NSASmpDelete) ts
-              ns <- asks ntfSupervisor
-              atomically $ writeTBQueue (ntfSubQ ns) (connId, NSCNtfSMPWorker smpServer)
-          NSARotate ->
-            deleteNtfSub $ do
-              withStore' c $ \db -> deleteNtfSubscription db connId
-              ns <- asks ntfSupervisor
-              atomically $ writeTBQueue (ntfSubQ ns) (connId, NSCCreate)
+    runNtfOperation = do
+      ntfBatchSize <- asks $ ntfBatchSize . config
+      withWorkItems c doWork (\db -> getNextNtfSubNTFActions db srv ntfBatchSize) $ \nextSubs -> do
+        logInfo $ "runNtfWorker - length nextSubs = " <> tshow (length nextSubs)
+        currTs <- liftIO getCurrentTime
+        let (creates, checks, deletes, rotates) = splitActions currTs nextSubs
+        if null creates && null checks && null deletes && null rotates
+          then
+            let (_, _, firstActionTs) = L.head nextSubs
+             in lift $ rescheduleWork doWork currTs firstActionTs
+          else do
+            retrySubActions c creates createSubs
+            retrySubActions c checks checkSubs
+            retrySubActions c deletes deleteSubs
+            retrySubActions c rotates rotateSubs
+    splitActions :: UTCTime -> NonEmpty (NtfSubNTFAction, NtfSubscription, NtfActionTs) -> ([NtfSubscription], [NtfSubscription], [NtfSubscription], [NtfSubscription])
+    splitActions currTs = foldr addAction ([], [], [], [])
       where
-        deleteNtfSub continue = case ntfSubId of
-          Just nSubId ->
-            lift getNtfToken >>= \case
-              Just tkn@NtfToken {ntfServer} -> do
-                atomically $ incNtfServerStat c userId ntfServer ntfDelAttempts
-                tryAgentError (agentNtfDeleteSubscription c nSubId tkn) >>= \case
-                  Left e | temporaryOrHostError e -> throwE e
-                  _ -> continue
+        addAction (cmd, sub, ts) acc@(creates, checks, deletes, rotates) = case cmd of
+          NSACreate -> (sub : creates, checks, deletes, rotates)
+          NSACheck
+            | ts <= currTs -> (creates, sub : checks, deletes, rotates)
+            | otherwise -> acc
+          NSADelete -> (creates, checks, sub : deletes, rotates)
+          NSARotate -> (creates, checks, deletes, sub : rotates)
+    createSubs :: [NtfSubscription] -> AM' [NtfSubscription]
+    createSubs ntfSubs =
+      getNtfToken >>= \case
+        Just tkn@NtfToken {ntfServer, ntfTokenId = Just tknId, ntfTknStatus = NTActive, ntfMode = NMInstant} -> do
+          subsRqs_ <- zip ntfSubs <$> withStoreBatch c (\db -> map (getQueue db) ntfSubs)
+          let (errs1, subs_, newSubs_) = splitSubs tknId subsRqs_
+          incStatByUserId ntfServer ntfCreateAttempts subs_
+          case (L.nonEmpty subs_, L.nonEmpty newSubs_) of
+            (Just subs, Just newSubs) -> do
+              rs <- L.zip subs <$> agentNtfCreateSubscriptions c tkn newSubs
+              let (ntfSubs', errs2, nSubIds) = splitResults $ L.toList rs
+                  subs' = map fst nSubIds
+                  errs2' = map (first ntfSubConnId) errs2
+              incStatByUserId ntfServer ntfCreated subs'
+              ts <- liftIO getCurrentTime
+              int <- asks $ ntfSubFirstCheckInterval . config
+              let checkTs = addUTCTime int ts
+              (errs3, _) <- partitionErrs ntfSubConnId subs' <$> withStoreBatch' c (\db -> map (updateSubNSACheck db checkTs) nSubIds)
+              workerErrors c $ errs1 <> errs2' <> errs3
+              pure ntfSubs'
+            _ -> workerErrors c errs1 $> []
+        _ -> do
+          let errs = map (\sub -> (ntfSubConnId sub, INTERNAL "NSACreate - no active token")) ntfSubs
+          workerErrors c errs
+          pure []
+      where
+        getQueue :: DB.Connection -> NtfSubscription -> IO (Either AgentErrorType RcvQueue)
+        getQueue db NtfSubscription {connId} = first storeError <$> getPrimaryRcvQueue db connId
+        splitSubs :: NtfTokenId -> [(NtfSubscription, Either AgentErrorType RcvQueue)] -> ([(ConnId, AgentErrorType)], [NtfSubscription], [NewNtfEntity 'Subscription])
+        splitSubs tknId = foldr splitSub ([], [], [])
+          where
+            splitSub (sub, rq) (errs, subs, newSubs) = case rq of
+              Right RcvQueue {clientNtfCreds = Just creds} -> (errs, sub : subs, toNewSub sub creds : newSubs)
+              Right _ -> ((ntfSubConnId sub, INTERNAL "NSACreate - no notifier queue credentials") : errs, subs, newSubs)
+              Left e -> ((ntfSubConnId sub, e) : errs, subs, newSubs)
+            toNewSub NtfSubscription {smpServer} ClientNtfCreds {ntfPrivateKey, notifierId} =
+              NewNtfSub tknId (SMPQueueNtf smpServer notifierId) ntfPrivateKey
+        updateSubNSACheck :: DB.Connection -> UTCTime -> (NtfSubscription, NtfSubscriptionId) -> IO ()
+        updateSubNSACheck db checkTs (sub, nSubId) = updateNtfSubscription db sub {ntfSubId = Just nSubId, ntfSubStatus = NASCreated NSNew} (NSANtf NSACheck) checkTs
+    checkSubs :: [NtfSubscription] -> AM' [NtfSubscription]
+    checkSubs ntfSubs =
+      getNtfToken >>= \case
+        Just tkn@NtfToken {ntfServer, ntfTknStatus = NTActive, ntfMode = NMInstant} -> do
+          let (errs1, subs_, subIds_) = splitSubs ntfSubs
+          incStatByUserId ntfServer ntfCheckAttempts subs_
+          case (L.nonEmpty subs_, L.nonEmpty subIds_) of
+            (Just subs, Just subIds) -> do
+              rs <- L.zip subs <$> agentNtfCheckSubscriptions c tkn subIds
+              let (ntfSubs', errs2, nSubStatuses) = splitResults $ L.toList rs
+                  subs' = map fst nSubStatuses
+                  (errs2', authSubs) = partitionEithers $ map (\case (sub, NTF _ SMP.AUTH) -> Right sub; e -> Left $ first ntfSubConnId e) errs2
+              incStatByUserId ntfServer ntfChecked subs'
+              ts <- liftIO getCurrentTime
+              int <- asks $ ntfSubCheckInterval . config
+              let nextCheckTs = addUTCTime int ts
+              (errs3, srvs) <- partitionErrs ntfSubConnId subs' <$> withStoreBatch' c (\db -> map (updateSub db ntfServer ts nextCheckTs) nSubStatuses)
+              (errs4, srvs') <- partitionErrs ntfSubConnId authSubs <$> withStoreBatch' c (\db -> map (recreateNtfSub db ntfServer ts) authSubs)
+              mapM_ (getNtfSMPWorker True c) $ S.fromList (catMaybes srvs <> srvs')
+              workerErrors c $ errs1 <> errs2' <> errs3 <> errs4
+              pure ntfSubs'
+            _ -> workerErrors c errs1 $> []
+        _ -> do
+          let errs = map (\sub -> (ntfSubConnId sub, INTERNAL "NSACheck - no active token")) ntfSubs
+          workerErrors c errs
+          pure []
+      where
+        splitSubs :: [NtfSubscription] -> ([(ConnId, AgentErrorType)], [NtfSubscription], [NtfSubscriptionId])
+        splitSubs = foldr splitSub ([], [], [])
+          where
+            splitSub sub (errs, subs, subIds) = case sub of
+              NtfSubscription {ntfSubId = Just subId} -> (errs, sub : subs, subId : subIds)
+              _ -> ((ntfSubConnId sub, INTERNAL "NSACheck - no subscription ID") : errs, subs, subIds)
+        updateSub :: DB.Connection -> NtfServer -> UTCTime -> UTCTime -> (NtfSubscription, NtfSubStatus) -> IO (Maybe SMPServer)
+        updateSub db ntfServer ts nextCheckTs (sub, status)
+          | ntfShouldSubscribe status =
+              let sub' = sub {ntfSubStatus = NASCreated status}
+               in Nothing <$ updateNtfSubscription db sub' (NSANtf NSACheck) nextCheckTs
+          -- ntf server stopped subscribing to this queue
+          | otherwise = Just <$> recreateNtfSub db ntfServer ts sub
+        recreateNtfSub :: DB.Connection -> NtfServer -> UTCTime -> NtfSubscription -> IO SMPServer
+        recreateNtfSub db ntfServer ts sub@NtfSubscription {smpServer} =
+          let sub' = sub {ntfServer, ntfQueueId = Nothing, ntfSubId = Nothing, ntfSubStatus = NASNew}
+           in smpServer <$ updateNtfSubscription db sub' (NSASMP NSASmpKey) ts
+    incStatByUserId :: NtfServer -> (AgentNtfServerStats -> TVar Int) -> [NtfSubscription] -> AM' ()
+    incStatByUserId ntfServer sel ss =
+      forM_ (M.assocs userIdsCounts) $ \(userId, count) ->
+        atomically $ incNtfServerStat' c userId ntfServer sel count
+      where
+        userIdsCounts = foldl' (\acc NtfSubscription {userId} -> M.insertWith (+) userId 1 acc) M.empty ss
+    -- NSADelete and NSARotate are deprecated, but their processing is kept for legacy db records;
+    -- These actions are not batched
+    deleteSubs :: [NtfSubscription] -> AM' [NtfSubscription]
+    deleteSubs ntfSubs = do
+      retrySubs_ <- mapM (runCatching deleteSub) ntfSubs
+      pure $ catMaybes retrySubs_
+      where
+        deleteSub :: NtfSubscription -> AM (Maybe NtfSubscription)
+        deleteSub sub@NtfSubscription {smpServer} =
+          deleteNtfSub sub $ do
+            let sub' = sub {ntfSubId = Nothing, ntfSubStatus = NASOff}
+            ts <- liftIO getCurrentTime
+            withStore' c $ \db -> updateNtfSubscription db sub' (NSASMP NSASmpDelete) ts
+            lift . void $ getNtfSMPWorker True c smpServer
+    rotateSubs :: [NtfSubscription] -> AM' [NtfSubscription]
+    rotateSubs ntfSubs = do
+      retrySubs_ <- mapM (runCatching rotateSub) ntfSubs
+      pure $ catMaybes retrySubs_
+      where
+        rotateSub :: NtfSubscription -> AM (Maybe NtfSubscription)
+        rotateSub sub@NtfSubscription {connId} =
+          deleteNtfSub sub $ do
+            withStore' c $ \db -> deleteNtfSubscription db connId
+            ns <- asks ntfSupervisor
+            atomically $ writeTBQueue (ntfSubQ ns) (NSCCreate, [connId])
+    runCatching :: (NtfSubscription -> AM (Maybe NtfSubscription)) -> NtfSubscription -> AM' (Maybe NtfSubscription)
+    runCatching action sub@NtfSubscription {connId} =
+      fromRight Nothing
+        <$> runExceptT (action sub `catchAgentError` \e -> workerInternalError c connId (show e) $> Nothing)
+    -- deleteNtfSub is only used in NSADelete and NSARotate, so also deprecated
+    deleteNtfSub :: NtfSubscription -> AM () -> AM (Maybe NtfSubscription)
+    deleteNtfSub sub@NtfSubscription {userId, ntfSubId} continue = case ntfSubId of
+      Just nSubId ->
+        lift getNtfToken >>= \case
+          Just tkn@NtfToken {ntfServer} -> do
+            atomically $ incNtfServerStat c userId ntfServer ntfDelAttempts
+            tryAgentError (agentNtfDeleteSubscription c nSubId tkn) >>= \case
+              Right _ -> do
                 atomically $ incNtfServerStat c userId ntfServer ntfDeleted
-              Nothing -> continue
-          _ -> continue
-        updateSubNextCheck ts toStatus = do
-          checkInterval <- asks $ ntfSubCheckInterval . config
-          let nextCheckTs = addUTCTime checkInterval ts
-          updateSub (NASCreated toStatus) (NSANtf NSACheck) nextCheckTs
-        updateSub toStatus toAction actionTs' =
-          withStore' c $ \db ->
-            updateNtfSubscription db sub {ntfSubStatus = toStatus} toAction actionTs'
+                continue'
+              Left e
+                | temporaryOrHostError e -> pure $ Just sub -- don't continue, retry
+                | otherwise -> continue'
+          Nothing -> continue'
+      _ -> continue'
+      where
+        continue' = continue $> Nothing -- continue without retry
 
 runNtfSMPWorker :: AgentClient -> SMPServer -> Worker -> AM ()
-runNtfSMPWorker c srv Worker {doWork} = do
-  env <- ask
-  forever $ do
-    waitForWork doWork
-    ExceptT . liftIO . agentOperationBracket c AONtfNetwork throwWhenInactive $
-      runReaderT (runExceptT runNtfSMPOperation) env
+runNtfSMPWorker c srv Worker {doWork} = forever $ do
+  waitForWork doWork
+  ExceptT $ agentOperationBracket c AONtfNetwork throwWhenInactive $ runExceptT runNtfSMPOperation
   where
-    runNtfSMPOperation =
-      withWork c doWork (`getNextNtfSubSMPAction` srv) $
-        \nextSub@(NtfSubscription {connId}, _, _) -> do
-          logInfo $ "runNtfSMPWorker, nextSub " <> tshow nextSub
-          ri <- asks $ reconnectInterval . config
-          withRetryInterval ri $ \_ loop -> do
-            liftIO $ waitWhileSuspended c
-            liftIO $ waitForUserNetwork c
-            processSub nextSub
-              `catchAgentError` retryOnError c "NtfSMPWorker" loop (workerInternalError c connId . show)
-    processSub :: (NtfSubscription, NtfSubSMPAction, NtfActionTs) -> AM ()
-    processSub (sub@NtfSubscription {connId, ntfServer}, smpAction, actionTs) = do
-      ts <- liftIO getCurrentTime
-      unlessM (lift $ rescheduleAction doWork ts actionTs) $
-        case smpAction of
-          NSASmpKey ->
-            lift getNtfToken >>= \case
-              Just NtfToken {ntfTknStatus = NTActive, ntfMode = NMInstant} -> do
-                rq <- withStore c (`getPrimaryRcvQueue` connId)
-                C.AuthAlg a <- asks (rcvAuthAlg . config)
-                g <- asks random
-                (ntfPublicKey, ntfPrivateKey) <- atomically $ C.generateAuthKeyPair a g
-                (rcvNtfPubDhKey, rcvNtfPrivDhKey) <- atomically $ C.generateKeyPair g
-                (notifierId, rcvNtfSrvPubDhKey) <- enableQueueNotifications c rq ntfPublicKey rcvNtfPubDhKey
-                let rcvNtfDhSecret = C.dh' rcvNtfSrvPubDhKey rcvNtfPrivDhKey
-                withStore' c $ \db -> do
-                  setRcvQueueNtfCreds db connId $ Just ClientNtfCreds {ntfPublicKey, ntfPrivateKey, notifierId, rcvNtfDhSecret}
-                  updateNtfSubscription db sub {ntfQueueId = Just notifierId, ntfSubStatus = NASKey} (NSANtf NSACreate) ts
-                ns <- asks ntfSupervisor
-                atomically $ sendNtfSubCommand ns (connId, NSCNtfWorker ntfServer)
-              _ -> workerInternalError c connId "NSASmpKey - no active token"
-          NSASmpDelete -> do
-            -- TODO should we remove it after successful removal from the server?
-            rq_ <- withStore' c $ \db -> do
-              setRcvQueueNtfCreds db connId Nothing
-              getPrimaryRcvQueue db connId
-            mapM_ (disableQueueNotifications c) rq_
-            withStore' c $ \db -> deleteNtfSubscription db connId
+    runNtfSMPOperation :: AM ()
+    runNtfSMPOperation = do
+      ntfBatchSize <- asks $ ntfBatchSize . config
+      withWorkItems c doWork (\db -> getNextNtfSubSMPActions db srv ntfBatchSize) $ \nextSubs -> do
+        logInfo $ "runNtfSMPWorker - length nextSubs = " <> tshow (length nextSubs)
+        let (creates, deletes) = splitActions nextSubs
+        retrySubActions c creates createNotifierKeys
+        retrySubActions c deletes deleteNotifierKeys
+    splitActions :: NonEmpty (NtfSubSMPAction, NtfSubscription) -> ([NtfSubscription], [NtfSubscription])
+    splitActions = foldr addAction ([], [])
+      where
+        addAction (cmd, sub) (creates, deletes) = case cmd of
+          NSASmpKey -> (sub : creates, deletes)
+          NSASmpDelete -> (creates, sub : deletes)
+    createNotifierKeys :: [NtfSubscription] -> AM' [NtfSubscription]
+    createNotifierKeys ntfSubs =
+      getNtfToken >>= \case
+        Just NtfToken {ntfTknStatus = NTActive, ntfMode = NMInstant} -> do
+          (errs1, subRqKeys) <- prepareQueueSmpKey ntfSubs
+          rs <- enableQueuesNtfs c subRqKeys
+          let (subRqKeys', errs2, successes) = splitResults rs
+              ntfSubs' = map eqnrNtfSub subRqKeys'
+              errs2' = map (first (qConnId . eqnrRq)) errs2
+          ts <- liftIO getCurrentTime
+          (errs3, srvs) <- partitionErrs (qConnId . eqnrRq . fst) successes <$> withStoreBatch' c (\db -> map (storeNtfSubCreds db ts) successes)
+          mapM_ (getNtfNTFWorker True c) $ S.fromList srvs
+          workerErrors c $ errs1 <> errs2' <> errs3
+          pure ntfSubs'
+        _ -> do
+          let errs = map (\sub -> (ntfSubConnId sub, INTERNAL "NSASmpKey - no active token")) ntfSubs
+          workerErrors c errs
+          pure []
+      where
+        prepareQueueSmpKey :: [NtfSubscription] -> AM' ([(ConnId, AgentErrorType)], [EnableQueueNtfReq])
+        prepareQueueSmpKey subs = do
+          alg <- asks (rcvAuthAlg . config)
+          g <- asks random
+          partitionErrs ntfSubConnId subs <$> withStoreBatch c (\db -> map (getQueue db alg g) subs)
+          where
+            getQueue :: DB.Connection -> C.AuthAlg -> TVar ChaChaDRG -> NtfSubscription -> IO (Either AgentErrorType EnableQueueNtfReq)
+            getQueue db (C.AuthAlg a) g sub = fmap (first storeError) $ runExceptT $ do
+              rq <- ExceptT $ getPrimaryRcvQueue db (ntfSubConnId sub)
+              authKeyPair <- atomically $ C.generateAuthKeyPair a g
+              rcvNtfKeyPair <- atomically $ C.generateKeyPair g
+              pure (EnableQueueNtfReq sub rq authKeyPair rcvNtfKeyPair)
+        storeNtfSubCreds :: DB.Connection -> UTCTime -> (EnableQueueNtfReq, (SMP.NotifierId, SMP.RcvNtfPublicDhKey)) -> IO NtfServer
+        storeNtfSubCreds db ts (EnableQueueNtfReq {eqnrNtfSub, eqnrAuthKeyPair = (ntfPublicKey, ntfPrivateKey), eqnrRcvKeyPair = (_, pk)}, (notifierId, srvPubDhKey)) = do
+          let NtfSubscription {ntfServer} = eqnrNtfSub
+              rcvNtfDhSecret = C.dh' srvPubDhKey pk
+          setRcvQueueNtfCreds db (ntfSubConnId eqnrNtfSub) $ Just ClientNtfCreds {ntfPublicKey, ntfPrivateKey, notifierId, rcvNtfDhSecret}
+          updateNtfSubscription db eqnrNtfSub {ntfQueueId = Just notifierId, ntfSubStatus = NASKey} (NSANtf NSACreate) ts
+          pure ntfServer
+    deleteNotifierKeys :: [NtfSubscription] -> AM' [NtfSubscription]
+    deleteNotifierKeys ntfSubs = do
+      (errs1, subRqs) <- partitionErrs ntfSubConnId ntfSubs <$> withStoreBatch c (\db -> map (resetCredsGetQueue db) ntfSubs)
+      rs <- disableQueuesNtfs c subRqs
+      let (subRqs', errs2, successes) = splitResults rs
+          ntfSubs' = map fst subRqs'
+          errs2' = map (first (qConnId . snd)) errs2
+          disabledRqs = map (snd . fst) successes
+      (errs3, _) <- partitionErrs qConnId disabledRqs <$> withStoreBatch' c (\db -> map (deleteSub db) disabledRqs)
+      workerErrors c $ errs1 <> errs2' <> errs3
+      pure ntfSubs'
+      where
+        resetCredsGetQueue :: DB.Connection -> NtfSubscription -> IO (Either AgentErrorType DisableQueueNtfReq)
+        resetCredsGetQueue db sub@NtfSubscription {connId} = fmap (first storeError) $ runExceptT $ do
+          liftIO $ setRcvQueueNtfCreds db connId Nothing
+          rq <- ExceptT $ getPrimaryRcvQueue db connId
+          pure (sub, rq)
+        deleteSub :: DB.Connection -> RcvQueue -> IO ()
+        deleteSub db rq = deleteNtfSubscription db (qConnId rq)
 
-rescheduleAction :: TMVar () -> UTCTime -> UTCTime -> AM' Bool
-rescheduleAction doWork ts actionTs
-  | actionTs <= ts = pure False
-  | otherwise = do
-      void . atomically $ tryTakeTMVar doWork
-      void . forkIO $ do
-        liftIO $ threadDelay' $ diffToMicroseconds $ diffUTCTime actionTs ts
-        atomically $ hasWorkToDo' doWork
-      pure True
+retrySubActions :: AgentClient -> [NtfSubscription] -> ([NtfSubscription] -> AM' [NtfSubscription]) -> AM ()
+retrySubActions _ [] _ = pure ()
+retrySubActions c subs action = do
+  v <- newTVarIO subs
+  ri <- asks $ reconnectInterval . config
+  withRetryInterval ri $ \_ loop -> do
+    liftIO $ waitWhileSuspended c
+    liftIO $ waitForUserNetwork c
+    subs' <- readTVarIO v
+    retrySubs <- lift $ action subs'
+    unless (null retrySubs) $ do
+      atomically $ writeTVar v retrySubs
+      retryNetworkLoop c loop
 
-retryOnError :: AgentClient -> Text -> AM () -> (AgentErrorType -> AM ()) -> AgentErrorType -> AM ()
-retryOnError c name loop done e = do
-  logError $ name <> " error: " <> tshow e
-  case e of
-    BROKER _ NETWORK -> retryLoop
-    BROKER _ TIMEOUT -> retryLoop
-    _ -> done e
+--                                                (temporary errs, other errs, successes)
+splitResults :: [(a, Either AgentErrorType r)] -> ([a], [(a, AgentErrorType)], [(a, r)])
+splitResults = foldr addRes ([], [], [])
   where
-    retryLoop = do
-      atomically $ endAgentOperation c AONtfNetwork
-      liftIO $ throwWhenInactive c
-      atomically $ beginAgentOperation c AONtfNetwork
-      loop
+    addRes (a, r_) (as, errs, rs) = case r_ of
+      Right r -> (as, errs, (a, r) : rs)
+      Left e
+        | temporaryOrHostError e -> (a : as, errs, rs)
+        | otherwise -> (as, (a, e) : errs, rs)
+
+rescheduleWork :: TMVar () -> UTCTime -> UTCTime -> AM' ()
+rescheduleWork doWork ts actionTs = do
+  void . atomically $ tryTakeTMVar doWork
+  void . forkIO $ do
+    liftIO $ threadDelay' $ diffToMicroseconds $ diffUTCTime actionTs ts
+    atomically $ hasWorkToDo' doWork
+
+retryNetworkLoop :: AgentClient -> AM () -> AM ()
+retryNetworkLoop c loop = do
+  atomically $ endAgentOperation c AONtfNetwork
+  liftIO $ throwWhenInactive c
+  atomically $ beginAgentOperation c AONtfNetwork
+  loop
+
+workerErrors :: AgentClient -> [(ConnId, AgentErrorType)] -> AM' ()
+workerErrors c connErrs =
+  unless (null connErrs) $ do
+    void $ withStoreBatch' c (\db -> map (setNullNtfSubscriptionAction db . fst) connErrs)
+    notifyErrs c connErrs
 
 workerInternalError :: AgentClient -> ConnId -> String -> AM ()
 workerInternalError c connId internalErrStr = do
@@ -311,6 +506,14 @@ notifyInternalError :: MonadIO m => AgentClient -> ConnId -> String -> m ()
 notifyInternalError AgentClient {subQ} connId internalErrStr = atomically $ writeTBQueue subQ ("", connId, AEvt SAEConn $ ERR $ INTERNAL internalErrStr)
 {-# INLINE notifyInternalError #-}
 
+notifyInternalError' :: MonadIO m => AgentClient -> String -> m ()
+notifyInternalError' AgentClient {subQ} internalErrStr = atomically $ writeTBQueue subQ ("", "", AEvt SAEConn $ ERR $ INTERNAL internalErrStr)
+{-# INLINE notifyInternalError' #-}
+
+notifyErrs :: MonadIO m => AgentClient -> [(ConnId, AgentErrorType)] -> m ()
+notifyErrs AgentClient {subQ} connErrs = unless (null connErrs) $ atomically $ writeTBQueue subQ ("", "", AEvt SAENone $ ERRS connErrs)
+{-# INLINE notifyErrs #-}
+
 getNtfToken :: AM' (Maybe NtfToken)
 getNtfToken = do
   tkn <- asks $ ntfTkn . ntfSupervisor
@@ -322,7 +525,7 @@ nsUpdateToken ns tkn = writeTVar (ntfTkn ns) $ Just tkn
 nsRemoveNtfToken :: NtfSupervisor -> STM ()
 nsRemoveNtfToken ns = writeTVar (ntfTkn ns) Nothing
 
-sendNtfSubCommand :: NtfSupervisor -> (ConnId, NtfSupervisorCommand) -> STM ()
+sendNtfSubCommand :: NtfSupervisor -> (NtfSupervisorCommand, NonEmpty ConnId) -> STM ()
 sendNtfSubCommand ns cmd = do
   tkn <- readTVar (ntfTkn ns)
   when (instantNotifications tkn) $ writeTBQueue (ntfSubQ ns) cmd
@@ -332,10 +535,51 @@ instantNotifications = \case
   Just NtfToken {ntfTknStatus = NTActive, ntfMode = NMInstant} -> True
   _ -> False
 
+deleteToken :: AgentClient -> NtfToken -> AM ()
+deleteToken c tkn@NtfToken {ntfServer, ntfTokenId, ntfPrivKey} = do
+  setToDelete <- withStore' c $ \db -> do
+    removeNtfToken db tkn
+    case ntfTokenId of
+      Just tknId -> addNtfTokenToDelete db ntfServer ntfPrivKey tknId $> True
+      Nothing -> pure False
+  ns <- asks ntfSupervisor
+  atomically $ nsRemoveNtfToken ns
+  when setToDelete $ void $ lift $ getNtfTknDelWorker True c ntfServer
+
+runNtfTknDelWorker :: AgentClient -> NtfServer -> Worker -> AM ()
+runNtfTknDelWorker c srv Worker {doWork} =
+  forever $ do
+    waitForWork doWork
+    ExceptT $ agentOperationBracket c AONtfNetwork throwWhenInactive $ runExceptT runNtfOperation
+  where
+    runNtfOperation :: AM ()
+    runNtfOperation =
+      withWork c doWork (`getNextNtfTokenToDelete` srv) $
+        \nextTknToDelete -> do
+          logInfo $ "runNtfTknDelWorker, nextTknToDelete " <> tshow nextTknToDelete
+          ri <- asks $ reconnectInterval . config
+          withRetryInterval ri $ \_ loop -> do
+            liftIO $ waitWhileSuspended c
+            liftIO $ waitForUserNetwork c
+            processTknToDelete nextTknToDelete `catchAgentError` retryTmpError loop nextTknToDelete
+    retryTmpError :: AM () -> NtfTokenToDelete -> AgentErrorType -> AM ()
+    retryTmpError loop (tknDbId, _, _) e = do
+      logError $ "ntf tkn del error: " <> tshow e
+      if temporaryOrHostError e
+        then retryNetworkLoop c loop
+        else do
+          withStore' c $ \db -> deleteNtfTokenToDelete db tknDbId
+          notifyInternalError' c (show e)
+    processTknToDelete :: NtfTokenToDelete -> AM ()
+    processTknToDelete (tknDbId, ntfPrivKey, tknId) = do
+      agentNtfDeleteToken c srv ntfPrivKey tknId
+      withStore' c $ \db -> deleteNtfTokenToDelete db tknDbId
+
 closeNtfSupervisor :: NtfSupervisor -> IO ()
 closeNtfSupervisor ns = do
   stopWorkers $ ntfWorkers ns
   stopWorkers $ ntfSMPWorkers ns
+  stopWorkers $ ntfTknDelWorkers ns
   where
     stopWorkers workers = atomically (swapTVar workers M.empty) >>= mapM_ (liftIO . cancelWorker)
 

src/Simplex/Messaging/Agent/Protocol.hs

@@ -51,6 +51,7 @@ module Simplex.Messaging.Agent.Protocol
     -- * SMP agent protocol types
     ConnInfo,
     SndQueueSecured,
+    AEntityId,
     ACommand (..),
     AEvent (..),
     AEvt (..),
@@ -107,6 +108,7 @@ module Simplex.Messaging.Agent.Protocol
     ConnReqUriData (..),
     CRClientData,
     ServiceScheme,
+    sameConnReqContact,
     simplexChat,
     connReqUriP',
     AgentErrorType (..),
@@ -165,8 +167,7 @@ import Data.Time.Clock.System (SystemTime)
 import Data.Type.Equality
 import Data.Typeable ()
 import Data.Word (Word16, Word32)
-import Database.SQLite.Simple.FromField
-import Database.SQLite.Simple.ToField
+import Simplex.Messaging.Agent.Store.DB (FromField (..), ToField (..))
 import Simplex.FileTransfer.Description
 import Simplex.FileTransfer.Protocol (FileParty (..))
 import Simplex.FileTransfer.Transport (XFTPErrorType)
@@ -190,7 +191,6 @@ import Simplex.Messaging.Parsers
 import Simplex.Messaging.Protocol
   ( AProtocolType,
     BrokerErrorType (..),
-    EntityId,
     ErrorType,
     MsgBody,
     MsgFlags,
@@ -198,7 +198,6 @@ import Simplex.Messaging.Protocol
     NMsgMeta,
     ProtocolServer (..),
     SMPClientVersion,
-    SMPMsgMeta,
     SMPServer,
     SMPServerWithAuth,
     SndPublicAuthKey,
@@ -277,20 +276,22 @@ supportedSMPAgentVRange = mkVersionRange minSupportedSMPAgentVersion currentSMPA
 e2eEncConnInfoLength :: VersionSMPA -> PQSupport -> Int
 e2eEncConnInfoLength v = \case
   -- reduced by 3726 (roughly the increase of message ratchet header size + key and ciphertext in reply link)
-  PQSupportOn | v >= pqdrSMPAgentVersion -> 11122
-  _ -> 14848
+  PQSupportOn | v >= pqdrSMPAgentVersion -> 11106
+  _ -> 14832
 
 e2eEncAgentMsgLength :: VersionSMPA -> PQSupport -> Int
 e2eEncAgentMsgLength v = \case
   -- reduced by 2222 (the increase of message ratchet header size)
-  PQSupportOn | v >= pqdrSMPAgentVersion -> 13634
-  _ -> 15856
+  PQSupportOn | v >= pqdrSMPAgentVersion -> 13618
+  _ -> 15840
 
 -- | SMP agent event
-type ATransmission = (ACorrId, EntityId, AEvt)
+type ATransmission = (ACorrId, AEntityId, AEvt)
 
 type UserId = Int64
 
+type AEntityId = ByteString
+
 type ACorrId = ByteString
 
 data AEntity = AEConn | AERcvFile | AESndFile | AENone
@@ -342,6 +343,7 @@ data AEvent (e :: AEntity) where
   INFO :: PQSupport -> ConnInfo -> AEvent AEConn
   CON :: PQEncryption -> AEvent AEConn -- notification that connection is established
   END :: AEvent AEConn
+  DELD :: AEvent AEConn
   CONNECT :: AProtocolType -> TransportHost -> AEvent AENone
   DISCONNECT :: AProtocolType -> TransportHost -> AEvent AENone
   DOWN :: SMPServer -> [ConnId] -> AEvent AENone
@@ -353,16 +355,17 @@ data AEvent (e :: AEntity) where
   MERR :: AgentMsgId -> AgentErrorType -> AEvent AEConn
   MERRS :: NonEmpty AgentMsgId -> AgentErrorType -> AEvent AEConn
   MSG :: MsgMeta -> MsgFlags -> MsgBody -> AEvent AEConn
-  MSGNTF :: SMPMsgMeta -> AEvent AEConn
+  MSGNTF :: MsgId -> Maybe UTCTime -> AEvent AEConn
   RCVD :: MsgMeta -> NonEmpty MsgReceipt -> AEvent AEConn
   QCONT :: AEvent AEConn
-  DEL_RCVQ :: SMPServer -> SMP.RecipientId -> Maybe AgentErrorType -> AEvent AEConn
-  DEL_CONN :: AEvent AEConn
+  DEL_RCVQS :: NonEmpty (ConnId, SMPServer, SMP.RecipientId, Maybe AgentErrorType) -> AEvent AEConn
+  DEL_CONNS :: NonEmpty ConnId -> AEvent AEConn
   DEL_USER :: Int64 -> AEvent AENone
   STAT :: ConnectionStats -> AEvent AEConn
   OK :: AEvent AEConn
   JOINED :: SndQueueSecured -> AEvent AEConn
   ERR :: AgentErrorType -> AEvent AEConn
+  ERRS :: [(ConnId, AgentErrorType)] -> AEvent AENone
   SUSPENDED :: AEvent AENone
   RFPROG :: Int64 -> Int64 -> AEvent AERcvFile
   RFDONE :: FilePath -> AEvent AERcvFile
@@ -411,6 +414,7 @@ data AEventTag (e :: AEntity) where
   INFO_ :: AEventTag AEConn
   CON_ :: AEventTag AEConn
   END_ :: AEventTag AEConn
+  DELD_ :: AEventTag AEConn
   CONNECT_ :: AEventTag AENone
   DISCONNECT_ :: AEventTag AENone
   DOWN_ :: AEventTag AENone
@@ -425,13 +429,14 @@ data AEventTag (e :: AEntity) where
   MSGNTF_ :: AEventTag AEConn
   RCVD_ :: AEventTag AEConn
   QCONT_ :: AEventTag AEConn
-  DEL_RCVQ_ :: AEventTag AEConn
-  DEL_CONN_ :: AEventTag AEConn
+  DEL_RCVQS_ :: AEventTag AEConn
+  DEL_CONNS_ :: AEventTag AEConn
   DEL_USER_ :: AEventTag AENone
   STAT_ :: AEventTag AEConn
   OK_ :: AEventTag AEConn
   JOINED_ :: AEventTag AEConn
   ERR_ :: AEventTag AEConn
+  ERRS_ :: AEventTag AENone
   SUSPENDED_ :: AEventTag AENone
   -- XFTP commands and responses
   RFDONE_ :: AEventTag AERcvFile
@@ -464,6 +469,7 @@ aEventTag = \case
   INFO {} -> INFO_
   CON _ -> CON_
   END -> END_
+  DELD -> DELD_
   CONNECT {} -> CONNECT_
   DISCONNECT {} -> DISCONNECT_
   DOWN {} -> DOWN_
@@ -478,13 +484,14 @@ aEventTag = \case
   MSGNTF {} -> MSGNTF_
   RCVD {} -> RCVD_
   QCONT -> QCONT_
-  DEL_RCVQ {} -> DEL_RCVQ_
-  DEL_CONN -> DEL_CONN_
+  DEL_RCVQS _ -> DEL_RCVQS_
+  DEL_CONNS _ -> DEL_CONNS_
   DEL_USER _ -> DEL_USER_
   STAT _ -> STAT_
   OK -> OK_
   JOINED _ -> JOINED_
   ERR _ -> ERR_
+  ERRS _ -> ERRS_
   SUSPENDED -> SUSPENDED_
   RFPROG {} -> RFPROG_
   RFDONE {} -> RFDONE_
@@ -1256,6 +1263,12 @@ instance Eq AConnectionRequestUri where
 
 deriving instance Show AConnectionRequestUri
 
+sameConnReqContact :: ConnectionRequestUri 'CMContact -> ConnectionRequestUri 'CMContact -> Bool
+sameConnReqContact (CRContactUri ConnReqUriData {crSmpQueues = qs}) (CRContactUri ConnReqUriData {crSmpQueues = qs'}) =
+  L.length qs == L.length qs' && all same (L.zip qs qs')
+  where
+    same (q, q') = sameQAddress (qAddress q) (qAddress q')
+
 data ConnReqUriData = ConnReqUriData
   { crScheme :: ServiceScheme,
     crAgentVRange :: VersionRangeSMPA,
@@ -1336,6 +1349,8 @@ data AgentErrorType
     CMD {cmdErr :: CommandErrorType, errContext :: String}
   | -- | connection errors
     CONN {connErr :: ConnectionErrorType}
+  | -- | user not found in database
+    NO_USER
   | -- | SMP protocol errors forwarded to agent clients
     SMP {serverAddress :: String, smpErr :: ErrorType}
   | -- | NTF protocol errors forwarded to agent clients

src/Simplex/Messaging/Agent/Stats.hs

@@ -10,11 +10,10 @@ import qualified Data.Aeson.TH as J
 import Data.Int (Int64)
 import Data.Map.Strict (Map)
 import qualified Data.Map.Strict as M
-import Database.SQLite.Simple.FromField (FromField (..))
-import Database.SQLite.Simple.ToField (ToField (..))
 import Simplex.Messaging.Agent.Protocol (UserId)
+import Simplex.Messaging.Agent.Store.DB (FromField (..), ToField (..))
 import Simplex.Messaging.Parsers (defaultJSON, fromTextField_)
-import Simplex.Messaging.Protocol (SMPServer, XFTPServer, NtfServer)
+import Simplex.Messaging.Protocol (NtfServer, SMPServer, XFTPServer)
 import Simplex.Messaging.Util (decodeJSON, encodeJSON)
 import UnliftIO.STM
 

src/Simplex/Messaging/Agent/Store.hs

@@ -29,6 +29,10 @@ import Data.Time (UTCTime)
 import Data.Type.Equality
 import Simplex.Messaging.Agent.Protocol
 import Simplex.Messaging.Agent.RetryInterval (RI2State)
+import Simplex.Messaging.Agent.Store.Common
+import Simplex.Messaging.Agent.Store.Interface (DBOpts, createDBStore)
+import qualified Simplex.Messaging.Agent.Store.Migrations as Migrations
+import Simplex.Messaging.Agent.Store.Shared (MigrationConfirmation (..), MigrationError (..))
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Crypto.Ratchet (PQEncryption, PQSupport, RatchetX448)
 import Simplex.Messaging.Encoding.String
@@ -42,13 +46,16 @@ import Simplex.Messaging.Protocol
     RcvDhSecret,
     RcvNtfDhSecret,
     RcvPrivateAuthKey,
+    SenderCanSecure,
     SndPrivateAuthKey,
     SndPublicAuthKey,
-    SenderCanSecure,
     VersionSMPC,
   )
 import qualified Simplex.Messaging.Protocol as SMP
 
+createStore :: DBOpts -> MigrationConfirmation -> IO (Either MigrationError DBStore)
+createStore dbOpts = createDBStore dbOpts Migrations.app
+
 -- * Queue types
 
 data QueueStored = QSStored | QSNew
@@ -623,7 +630,7 @@ data StoreError
   | -- | Confirmation not found.
     SEConfirmationNotFound
   | -- | Invitation not found
-    SEInvitationNotFound
+    SEInvitationNotFound String InvitationId
   | -- | Message not found
     SEMsgNotFound
   | -- | Command not found

src/Simplex/Messaging/Agent/Store/Common.hs

@@ -0,0 +1,14 @@
+{-# LANGUAGE CPP #-}
+
+module Simplex.Messaging.Agent.Store.Common
+#if defined(dbPostgres)
+  ( module Simplex.Messaging.Agent.Store.Postgres.Common,
+  )
+  where
+import Simplex.Messaging.Agent.Store.Postgres.Common
+#else
+  ( module Simplex.Messaging.Agent.Store.SQLite.Common,
+  )
+  where
+import Simplex.Messaging.Agent.Store.SQLite.Common
+#endif

src/Simplex/Messaging/Agent/Store/DB.hs

@@ -0,0 +1,19 @@
+{-# LANGUAGE CPP #-}
+
+module Simplex.Messaging.Agent.Store.DB
+#if defined(dbPostgres)
+  ( module Simplex.Messaging.Agent.Store.Postgres.DB,
+    FromField (..),
+    ToField (..),
+  )
+  where
+import Simplex.Messaging.Agent.Store.Postgres.DB
+#else
+  ( module Simplex.Messaging.Agent.Store.SQLite.DB,
+    FromField (..),
+    ToField (..),
+  )
+  where
+import Simplex.Messaging.Agent.Store.SQLite.DB
+#endif
+

src/Simplex/Messaging/Agent/Store/Interface.hs

@@ -0,0 +1,14 @@
+{-# LANGUAGE CPP #-}
+
+module Simplex.Messaging.Agent.Store.Interface
+#if defined(dbPostgres)
+  ( module Simplex.Messaging.Agent.Store.Postgres,
+  )
+  where
+import Simplex.Messaging.Agent.Store.Postgres
+#else
+  ( module Simplex.Messaging.Agent.Store.SQLite,
+  )
+  where
+import Simplex.Messaging.Agent.Store.SQLite
+#endif

src/Simplex/Messaging/Agent/Store/Migrations.hs

@@ -0,0 +1,95 @@
+{-# LANGUAGE CPP #-}
+{-# LANGUAGE LambdaCase #-}
+
+module Simplex.Messaging.Agent.Store.Migrations
+  ( Migration (..),
+    MigrationsToRun (..),
+    DownMigration (..),
+    Migrations.app,
+    Migrations.getCurrent,
+    get,
+    Migrations.initialize,
+    Migrations.run,
+    migrateSchema,
+    -- for tests
+    migrationsToRun,
+    toDownMigration,
+  )
+where
+
+import Control.Monad
+import Data.Char (toLower)
+import Data.Functor (($>))
+import Data.Maybe (isNothing, mapMaybe)
+import Simplex.Messaging.Agent.Store.Common
+import Simplex.Messaging.Agent.Store.Shared
+import System.Exit (exitFailure)
+import System.IO (hFlush, stdout)
+#if defined(dbPostgres)
+import qualified Simplex.Messaging.Agent.Store.Postgres.Migrations as Migrations
+#else
+import qualified Simplex.Messaging.Agent.Store.SQLite.Migrations as Migrations
+import System.Directory (copyFile)
+#endif
+
+get :: DBStore -> [Migration] -> IO (Either MTRError MigrationsToRun)
+get st migrations = migrationsToRun migrations <$> withTransaction st Migrations.getCurrent
+
+migrationsToRun :: [Migration] -> [Migration] -> Either MTRError MigrationsToRun
+migrationsToRun [] [] = Right MTRNone
+migrationsToRun appMs [] = Right $ MTRUp appMs
+migrationsToRun [] dbMs
+  | length dms == length dbMs = Right $ MTRDown dms
+  | otherwise = Left $ MTRENoDown $ mapMaybe nameNoDown dbMs
+  where
+    dms = mapMaybe toDownMigration dbMs
+    nameNoDown m = if isNothing (down m) then Just $ name m else Nothing
+migrationsToRun (a : as) (d : ds)
+  | name a == name d = migrationsToRun as ds
+  | otherwise = Left $ MTREDifferent (name a) (name d)
+
+migrateSchema :: DBStore -> [Migration] -> MigrationConfirmation -> Bool -> IO (Either MigrationError ())
+migrateSchema st migrations confirmMigrations vacuum = do
+  Migrations.initialize st
+  get st migrations >>= \case
+    Left e -> do
+      when (confirmMigrations == MCConsole) $ confirmOrExit ("Database state error: " <> mtrErrorDescription e)
+      pure . Left $ MigrationError e
+    Right MTRNone -> pure $ Right ()
+    Right ms@(MTRUp ums)
+      | dbNew st -> Migrations.run st vacuum ms $> Right ()
+      | otherwise -> case confirmMigrations of
+          MCYesUp -> runWithBackup st vacuum ms
+          MCYesUpDown -> runWithBackup st vacuum ms
+          MCConsole -> confirm err >> runWithBackup st vacuum ms
+          MCError -> pure $ Left err
+      where
+        err = MEUpgrade $ map upMigration ums -- "The app has a newer version than the database.\nConfirm to back up and upgrade using these migrations: " <> intercalate ", " (map name ums)
+    Right ms@(MTRDown dms) -> case confirmMigrations of
+      MCYesUpDown -> runWithBackup st vacuum ms
+      MCConsole -> confirm err >> runWithBackup st vacuum ms
+      MCYesUp -> pure $ Left err
+      MCError -> pure $ Left err
+      where
+        err = MEDowngrade $ map downName dms
+  where
+    confirm err = confirmOrExit $ migrationErrorDescription err
+
+runWithBackup :: DBStore -> Bool -> MigrationsToRun -> IO (Either a ())
+#if defined(dbPostgres)
+runWithBackup st vacuum ms = Migrations.run st vacuum ms $> Right ()
+#else
+runWithBackup st vacuum ms = do
+  let f = dbFilePath st
+  copyFile f (f <> ".bak")
+  Migrations.run st vacuum ms
+  pure $ Right ()
+#endif
+
+confirmOrExit :: String -> IO ()
+confirmOrExit s = do
+  putStrLn s
+  putStr "Continue (y/N): "
+  hFlush stdout
+  ok <- getLine
+  when (map toLower ok /= "y") exitFailure

src/Simplex/Messaging/Agent/Store/Postgres.hs

@@ -0,0 +1,107 @@
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE QuasiQuotes #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+
+module Simplex.Messaging.Agent.Store.Postgres
+  ( DBOpts (..),
+    createDBStore,
+    closeDBStore,
+    reopenDBStore,
+    execSQL,
+  )
+where
+
+import Control.Exception (throwIO)
+import Control.Monad (unless, void)
+import Data.ByteString (ByteString)
+import Data.Functor (($>))
+import Data.String (fromString)
+import Data.Text (Text)
+import Database.PostgreSQL.Simple (Only (..))
+import qualified Database.PostgreSQL.Simple as PSQL
+import Database.PostgreSQL.Simple.SqlQQ (sql)
+import Simplex.Messaging.Agent.Store.Migrations (migrateSchema)
+import Simplex.Messaging.Agent.Store.Postgres.Common
+import qualified Simplex.Messaging.Agent.Store.Postgres.DB as DB
+import Simplex.Messaging.Agent.Store.Shared (Migration (..), MigrationConfirmation (..), MigrationError (..))
+import Simplex.Messaging.Util (ifM)
+import UnliftIO.Exception (bracketOnError, onException)
+import UnliftIO.MVar
+import UnliftIO.STM
+
+data DBOpts = DBOpts
+  { connstr :: ByteString,
+    schema :: String
+  }
+
+-- | Create a new Postgres DBStore with the given connection string, schema name and migrations.
+-- If passed schema does not exist in connectInfo database, it will be created.
+-- Applies necessary migrations to schema.
+-- TODO [postgres] authentication / user password, db encryption (?)
+createDBStore :: DBOpts -> [Migration] -> MigrationConfirmation -> IO (Either MigrationError DBStore)
+createDBStore DBOpts {connstr, schema} migrations confirmMigrations = do
+  st <- connectPostgresStore connstr schema
+  r <- migrateSchema st migrations confirmMigrations True `onException` closeDBStore st
+  case r of
+    Right () -> pure $ Right st
+    Left e -> closeDBStore st $> Left e
+
+connectPostgresStore :: ByteString -> String -> IO DBStore
+connectPostgresStore dbConnstr dbSchema = do
+  (dbConn, dbNew) <- connectDB dbConnstr dbSchema -- TODO [postgres] analogue for dbBusyLoop?
+  dbConnection <- newMVar dbConn
+  dbClosed <- newTVarIO False
+  pure DBStore {dbConnstr, dbSchema, dbConnection, dbNew, dbClosed}
+
+connectDB :: ByteString -> String -> IO (DB.Connection, Bool)
+connectDB connstr schema = do
+  db <- PSQL.connectPostgreSQL connstr
+  schemaExists <- prepare db `onException` PSQL.close db
+  let dbNew = not schemaExists
+  pure (db, dbNew)
+  where
+    prepare db = do
+      void $ PSQL.execute_ db "SET client_min_messages TO WARNING"
+      [Only schemaExists] <-
+        PSQL.query
+          db
+          [sql|
+            SELECT EXISTS (
+              SELECT 1 FROM pg_catalog.pg_namespace
+              WHERE nspname = ?
+            )
+          |]
+          (Only schema)
+      unless schemaExists $ void $ PSQL.execute_ db (fromString $ "CREATE SCHEMA " <> schema)
+      void $ PSQL.execute_ db (fromString $ "SET search_path TO " <> schema)
+      pure schemaExists
+
+-- can share with SQLite
+closeDBStore :: DBStore -> IO ()
+closeDBStore st@DBStore {dbClosed} =
+  ifM (readTVarIO dbClosed) (putStrLn "closeDBStore: already closed") $
+    withConnection st $ \conn -> do
+      DB.close conn
+      atomically $ writeTVar dbClosed True
+
+openPostgresStore_ :: DBStore -> IO ()
+openPostgresStore_ DBStore {dbConnstr, dbSchema, dbConnection, dbClosed} =
+  bracketOnError
+    (takeMVar dbConnection)
+    (tryPutMVar dbConnection)
+    $ \_dbConn -> do
+      (dbConn, _dbNew) <- connectDB dbConnstr dbSchema
+      atomically $ writeTVar dbClosed False
+      putMVar dbConnection dbConn
+
+reopenDBStore :: DBStore -> IO ()
+reopenDBStore st@DBStore {dbClosed} =
+  ifM (readTVarIO dbClosed) open (putStrLn "reopenDBStore: already opened")
+  where
+    open = openPostgresStore_ st
+
+-- TODO [postgres] not necessary for postgres (used for ExecAgentStoreSQL, ExecChatStoreSQL)
+execSQL :: PSQL.Connection -> Text -> IO [Text]
+execSQL _db _query = throwIO (userError "not implemented")

src/Simplex/Messaging/Agent/Store/Postgres/Common.hs

@@ -0,0 +1,49 @@
+{-# LANGUAGE NamedFieldPuns #-}
+
+module Simplex.Messaging.Agent.Store.Postgres.Common
+  ( DBStore (..),
+    withConnection,
+    withConnection',
+    withTransaction,
+    withTransaction',
+    withTransactionPriority,
+  )
+where
+
+import Data.ByteString (ByteString)
+import qualified Database.PostgreSQL.Simple as PSQL
+import UnliftIO.MVar
+import UnliftIO.STM
+
+-- TODO [postgres] use log_min_duration_statement instead of custom slow queries (SQLite's Connection type)
+data DBStore = DBStore
+  { dbConnstr :: ByteString,
+    dbSchema :: String,
+    dbConnection :: MVar PSQL.Connection,
+    dbClosed :: TVar Bool,
+    dbNew :: Bool
+  }
+
+-- TODO [postgres] connection pool
+withConnectionPriority :: DBStore -> Bool -> (PSQL.Connection -> IO a) -> IO a
+withConnectionPriority DBStore {dbConnection} _priority action =
+  withMVar dbConnection action
+
+withConnection :: DBStore -> (PSQL.Connection -> IO a) -> IO a
+withConnection st = withConnectionPriority st False
+
+withConnection' :: DBStore -> (PSQL.Connection -> IO a) -> IO a
+withConnection' = withConnection
+
+withTransaction' :: DBStore -> (PSQL.Connection -> IO a) -> IO a
+withTransaction' = withTransaction
+
+withTransaction :: DBStore -> (PSQL.Connection -> IO a) -> IO a
+withTransaction st = withTransactionPriority st False
+{-# INLINE withTransaction #-}
+
+-- TODO [postgres] analogue for dbBusyLoop?
+withTransactionPriority :: DBStore -> Bool -> (PSQL.Connection -> IO a) -> IO a
+withTransactionPriority st priority action = withConnectionPriority st priority transaction
+  where
+    transaction conn = PSQL.withTransaction conn $ action conn

src/Simplex/Messaging/Agent/Store/Postgres/DB.hs

@@ -0,0 +1,65 @@
+{-# LANGUAGE ScopedTypeVariables #-}
+
+module Simplex.Messaging.Agent.Store.Postgres.DB
+  ( BoolInt (..),
+    PSQL.Binary (..),
+    PSQL.Connection,
+    FromField (..),
+    ToField (..),
+    PSQL.connect,
+    PSQL.close,
+    execute,
+    execute_,
+    executeMany,
+    PSQL.query,
+    PSQL.query_,
+  )
+where
+
+import Control.Monad (void)
+import Data.Int (Int32, Int64)
+import Data.Word (Word16, Word32)
+import Database.PostgreSQL.Simple (ResultError (..))
+import qualified Database.PostgreSQL.Simple as PSQL
+import Database.PostgreSQL.Simple.FromField (FromField (..), returnError)
+import Database.PostgreSQL.Simple.ToField (ToField (..))
+
+newtype BoolInt = BI {unBI :: Bool}
+
+instance FromField BoolInt where
+  fromField field dat = BI . (/= (0 :: Int)) <$> fromField field dat
+  {-# INLINE fromField #-}
+
+instance ToField BoolInt where
+  toField (BI b) = toField ((if b then 1 else 0) :: Int)
+  {-# INLINE toField #-}
+
+execute :: PSQL.ToRow q => PSQL.Connection -> PSQL.Query -> q -> IO ()
+execute db q qs = void $ PSQL.execute db q qs
+{-# INLINE execute #-}
+
+execute_ :: PSQL.Connection -> PSQL.Query -> IO ()
+execute_ db q = void $ PSQL.execute_ db q
+{-# INLINE execute_ #-}
+
+executeMany :: PSQL.ToRow q => PSQL.Connection -> PSQL.Query -> [q] -> IO ()
+executeMany db q qs = void $ PSQL.executeMany db q qs
+{-# INLINE executeMany #-}
+
+-- orphan instances
+
+-- used in FileSize
+instance FromField Word32 where
+  fromField field dat = do
+    i :: Int64 <- fromField field dat
+    if i >= 0 && i <= fromIntegral (maxBound :: Word32)
+      then pure (fromIntegral i :: Word32)
+      else returnError ConversionFailed field "Negative value can't be converted to Word32"
+
+-- used in Version
+instance FromField Word16 where
+  fromField field dat = do
+    i :: Int64 <- fromField field dat
+    if i >= 0 && i <= fromIntegral (maxBound :: Word16)
+      then pure (fromIntegral i :: Word16)
+      else returnError ConversionFailed field "Negative value can't be converted to Word16"

src/Simplex/Messaging/Agent/Store/Postgres/Migrations.hs

@@ -0,0 +1,78 @@
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE QuasiQuotes #-}
+{-# LANGUAGE TupleSections #-}
+
+module Simplex.Messaging.Agent.Store.Postgres.Migrations
+  ( app,
+    initialize,
+    run,
+    getCurrent,
+  )
+where
+
+import Control.Monad (void)
+import Data.List (sortOn)
+import Data.Text (Text)
+import qualified Data.Text as T
+import qualified Data.Text.Encoding as TE
+import Data.Time.Clock (getCurrentTime)
+import qualified Database.PostgreSQL.LibPQ as LibPQ
+import Database.PostgreSQL.Simple (Only (..))
+import qualified Database.PostgreSQL.Simple as PSQL
+import Database.PostgreSQL.Simple.Internal (Connection (..))
+import Database.PostgreSQL.Simple.SqlQQ (sql)
+import Simplex.Messaging.Agent.Store.Postgres.Common
+import Simplex.Messaging.Agent.Store.Postgres.Migrations.M20241210_initial
+import Simplex.Messaging.Agent.Store.Shared
+import UnliftIO.MVar
+
+schemaMigrations :: [(String, Text, Maybe Text)]
+schemaMigrations =
+  [ ("20241210_initial", m20241210_initial, Nothing)
+  ]
+
+-- | The list of migrations in ascending order by date
+app :: [Migration]
+app = sortOn name $ map migration schemaMigrations
+  where
+    migration (name, up, down) = Migration {name, up, down = down}
+
+initialize :: DBStore -> IO ()
+initialize st = withTransaction' st $ \db ->
+  void $
+    PSQL.execute_
+      db
+      [sql|
+      CREATE TABLE IF NOT EXISTS migrations (
+        name TEXT NOT NULL,
+        ts TIMESTAMP NOT NULL,
+        down TEXT,
+        PRIMARY KEY (name)
+      )
+    |]
+
+run :: DBStore -> Bool -> MigrationsToRun -> IO ()
+run st _vacuum = \case
+  MTRUp [] -> pure ()
+  MTRUp ms -> mapM_ runUp ms
+  MTRDown ms -> mapM_ runDown $ reverse ms
+  MTRNone -> pure ()
+  where
+    runUp Migration {name, up, down} = withTransaction' st $ \db -> do
+      insert db
+      execSQL db up
+      where
+        insert db = void $ PSQL.execute db "INSERT INTO migrations (name, down, ts) VALUES (?,?,?)" . (name,down,) =<< getCurrentTime
+    runDown DownMigration {downName, downQuery} = withTransaction' st $ \db -> do
+      execSQL db downQuery
+      void $ PSQL.execute db "DELETE FROM migrations WHERE name = ?" (Only downName)
+    execSQL db query =
+      withMVar (connectionHandle db) $ \pqConn ->
+        void $ LibPQ.exec pqConn (TE.encodeUtf8 query)
+
+getCurrent :: PSQL.Connection -> IO [Migration]
+getCurrent db = map toMigration <$> PSQL.query_ db "SELECT name, down FROM migrations ORDER BY name ASC;"
+  where
+    toMigration (name, down) = Migration {name, up = T.pack "", down}

src/Simplex/Messaging/Agent/Store/Postgres/Migrations/M20241210_initial.hs

@@ -0,0 +1,545 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Messaging.Agent.Store.Postgres.Migrations.M20241210_initial where
+
+import Data.Text (Text)
+import qualified Data.Text as T
+import Text.RawString.QQ (r)
+
+m20241210_initial :: Text
+m20241210_initial =
+  T.pack
+    [r|
+CREATE TABLE users(
+  user_id BIGINT PRIMARY KEY GENERATED ALWAYS AS IDENTITY,
+  deleted SMALLINT NOT NULL DEFAULT 0
+);
+CREATE TABLE servers(
+  host TEXT NOT NULL,
+  port TEXT NOT NULL,
+  key_hash BYTEA NOT NULL,
+  PRIMARY KEY(host, port)
+);
+CREATE TABLE connections(
+  conn_id BYTEA NOT NULL PRIMARY KEY,
+  conn_mode TEXT NOT NULL,
+  last_internal_msg_id BIGINT NOT NULL DEFAULT 0,
+  last_internal_rcv_msg_id BIGINT NOT NULL DEFAULT 0,
+  last_internal_snd_msg_id BIGINT NOT NULL DEFAULT 0,
+  last_external_snd_msg_id BIGINT NOT NULL DEFAULT 0,
+  last_rcv_msg_hash BYTEA NOT NULL DEFAULT ''::BYTEA,
+  last_snd_msg_hash BYTEA NOT NULL DEFAULT ''::BYTEA,
+  smp_agent_version INTEGER NOT NULL DEFAULT 1,
+  duplex_handshake SMALLINT NULL DEFAULT 0,
+  enable_ntfs SMALLINT,
+  deleted SMALLINT NOT NULL DEFAULT 0,
+  user_id BIGINT NOT NULL REFERENCES users ON DELETE CASCADE,
+  ratchet_sync_state TEXT NOT NULL DEFAULT 'ok',
+  deleted_at_wait_delivery TIMESTAMPTZ,
+  pq_support SMALLINT NOT NULL DEFAULT 0
+);
+CREATE TABLE rcv_queues(
+  host TEXT NOT NULL,
+  port TEXT NOT NULL,
+  rcv_id BYTEA NOT NULL,
+  conn_id BYTEA NOT NULL REFERENCES connections ON DELETE CASCADE,
+  rcv_private_key BYTEA NOT NULL,
+  rcv_dh_secret BYTEA NOT NULL,
+  e2e_priv_key BYTEA NOT NULL,
+  e2e_dh_secret BYTEA,
+  snd_id BYTEA NOT NULL,
+  snd_key BYTEA,
+  status TEXT NOT NULL,
+  smp_server_version INTEGER NOT NULL DEFAULT 1,
+  smp_client_version INTEGER,
+  ntf_public_key BYTEA,
+  ntf_private_key BYTEA,
+  ntf_id BYTEA,
+  rcv_ntf_dh_secret BYTEA,
+  rcv_queue_id BIGINT NOT NULL,
+  rcv_primary SMALLINT NOT NULL,
+  replace_rcv_queue_id BIGINT NULL,
+  delete_errors BIGINT NOT NULL DEFAULT 0,
+  server_key_hash BYTEA,
+  switch_status TEXT,
+  deleted SMALLINT NOT NULL DEFAULT 0,
+  snd_secure SMALLINT NOT NULL DEFAULT 0,
+  last_broker_ts TIMESTAMPTZ,
+  PRIMARY KEY(host, port, rcv_id),
+  FOREIGN KEY(host, port) REFERENCES servers
+  ON DELETE RESTRICT ON UPDATE CASCADE,
+  UNIQUE(host, port, snd_id)
+);
+CREATE TABLE snd_queues(
+  host TEXT NOT NULL,
+  port TEXT NOT NULL,
+  snd_id BYTEA NOT NULL,
+  conn_id BYTEA NOT NULL REFERENCES connections ON DELETE CASCADE,
+  snd_private_key BYTEA NOT NULL,
+  e2e_dh_secret BYTEA NOT NULL,
+  status TEXT NOT NULL,
+  smp_server_version INTEGER NOT NULL DEFAULT 1,
+  smp_client_version INTEGER NOT NULL DEFAULT 1,
+  snd_public_key BYTEA,
+  e2e_pub_key BYTEA,
+  snd_queue_id BIGINT NOT NULL,
+  snd_primary SMALLINT NOT NULL,
+  replace_snd_queue_id BIGINT NULL,
+  server_key_hash BYTEA,
+  switch_status TEXT,
+  snd_secure SMALLINT NOT NULL DEFAULT 0,
+  PRIMARY KEY(host, port, snd_id),
+  FOREIGN KEY(host, port) REFERENCES servers
+  ON DELETE RESTRICT ON UPDATE CASCADE
+);
+CREATE TABLE messages(
+  conn_id BYTEA NOT NULL REFERENCES connections(conn_id)
+  ON DELETE CASCADE,
+  internal_id BIGINT NOT NULL,
+  internal_ts TIMESTAMPTZ NOT NULL,
+  internal_rcv_id BIGINT,
+  internal_snd_id BIGINT,
+  msg_type BYTEA NOT NULL,
+  msg_body BYTEA NOT NULL DEFAULT ''::BYTEA,
+  msg_flags TEXT NULL,
+  pq_encryption SMALLINT NOT NULL DEFAULT 0,
+  PRIMARY KEY(conn_id, internal_id)
+);
+CREATE TABLE rcv_messages(
+  conn_id BYTEA NOT NULL,
+  internal_rcv_id BIGINT NOT NULL,
+  internal_id BIGINT NOT NULL,
+  external_snd_id BIGINT NOT NULL,
+  broker_id BYTEA NOT NULL,
+  broker_ts TIMESTAMPTZ NOT NULL,
+  internal_hash BYTEA NOT NULL,
+  external_prev_snd_hash BYTEA NOT NULL,
+  integrity BYTEA NOT NULL,
+  user_ack SMALLINT NULL DEFAULT 0,
+  rcv_queue_id BIGINT NOT NULL,
+  PRIMARY KEY(conn_id, internal_rcv_id),
+  FOREIGN KEY(conn_id, internal_id) REFERENCES messages
+  ON DELETE CASCADE
+);
+ALTER TABLE messages
+ADD CONSTRAINT fk_messages_rcv_messages
+  FOREIGN KEY (conn_id, internal_rcv_id) REFERENCES rcv_messages
+  ON DELETE CASCADE DEFERRABLE INITIALLY DEFERRED;
+CREATE TABLE snd_messages(
+  conn_id BYTEA NOT NULL,
+  internal_snd_id BIGINT NOT NULL,
+  internal_id BIGINT NOT NULL,
+  internal_hash BYTEA NOT NULL,
+  previous_msg_hash BYTEA NOT NULL DEFAULT ''::BYTEA,
+  retry_int_slow BIGINT,
+  retry_int_fast BIGINT,
+  rcpt_internal_id BIGINT,
+  rcpt_status TEXT,
+  PRIMARY KEY(conn_id, internal_snd_id),
+  FOREIGN KEY(conn_id, internal_id) REFERENCES messages
+  ON DELETE CASCADE
+);
+ALTER TABLE messages
+ADD CONSTRAINT fk_messages_snd_messages
+  FOREIGN KEY (conn_id, internal_snd_id) REFERENCES snd_messages
+  ON DELETE CASCADE DEFERRABLE INITIALLY DEFERRED;
+CREATE TABLE conn_confirmations(
+  confirmation_id BYTEA NOT NULL PRIMARY KEY,
+  conn_id BYTEA NOT NULL REFERENCES connections ON DELETE CASCADE,
+  e2e_snd_pub_key BYTEA NOT NULL,
+  sender_key BYTEA,
+  ratchet_state BYTEA NOT NULL,
+  sender_conn_info BYTEA NOT NULL,
+  accepted SMALLINT NOT NULL,
+  own_conn_info BYTEA,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT (now()),
+  smp_reply_queues BYTEA NULL,
+  smp_client_version INTEGER
+);
+CREATE TABLE conn_invitations(
+  invitation_id BYTEA NOT NULL PRIMARY KEY,
+  contact_conn_id BYTEA NOT NULL REFERENCES connections ON DELETE CASCADE,
+  cr_invitation BYTEA NOT NULL,
+  recipient_conn_info BYTEA NOT NULL,
+  accepted SMALLINT NOT NULL DEFAULT 0,
+  own_conn_info BYTEA,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT (now())
+);
+CREATE TABLE ratchets(
+  conn_id BYTEA NOT NULL PRIMARY KEY REFERENCES connections
+  ON DELETE CASCADE,
+  x3dh_priv_key_1 BYTEA,
+  x3dh_priv_key_2 BYTEA,
+  ratchet_state BYTEA,
+  e2e_version INTEGER NOT NULL DEFAULT 1,
+  x3dh_pub_key_1 BYTEA,
+  x3dh_pub_key_2 BYTEA,
+  pq_priv_kem BYTEA,
+  pq_pub_kem BYTEA
+);
+CREATE TABLE skipped_messages(
+  skipped_message_id BIGINT PRIMARY KEY GENERATED ALWAYS AS IDENTITY,
+  conn_id BYTEA NOT NULL REFERENCES ratchets
+  ON DELETE CASCADE,
+  header_key BYTEA NOT NULL,
+  msg_n BIGINT NOT NULL,
+  msg_key BYTEA NOT NULL
+);
+CREATE TABLE ntf_servers(
+  ntf_host TEXT NOT NULL,
+  ntf_port TEXT NOT NULL,
+  ntf_key_hash BYTEA NOT NULL,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT (now()),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT (now()),
+  PRIMARY KEY(ntf_host, ntf_port)
+);
+CREATE TABLE ntf_tokens(
+  provider TEXT NOT NULL,
+  device_token TEXT NOT NULL,
+  ntf_host TEXT NOT NULL,
+  ntf_port TEXT NOT NULL,
+  tkn_id BYTEA,
+  tkn_pub_key BYTEA NOT NULL,
+  tkn_priv_key BYTEA NOT NULL,
+  tkn_pub_dh_key BYTEA NOT NULL,
+  tkn_priv_dh_key BYTEA NOT NULL,
+  tkn_dh_secret BYTEA,
+  tkn_status TEXT NOT NULL,
+  tkn_action BYTEA,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT (now()),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT (now()),
+  ntf_mode BYTEA NULL,
+  PRIMARY KEY(provider, device_token, ntf_host, ntf_port),
+  FOREIGN KEY(ntf_host, ntf_port) REFERENCES ntf_servers
+  ON DELETE RESTRICT ON UPDATE CASCADE
+);
+CREATE TABLE ntf_subscriptions(
+  conn_id BYTEA NOT NULL,
+  smp_host TEXT NULL,
+  smp_port TEXT NULL,
+  smp_ntf_id BYTEA,
+  ntf_host TEXT NOT NULL,
+  ntf_port TEXT NOT NULL,
+  ntf_sub_id BYTEA,
+  ntf_sub_status TEXT NOT NULL,
+  ntf_sub_action BYTEA,
+  ntf_sub_smp_action BYTEA,
+  ntf_sub_action_ts TIMESTAMPTZ,
+  updated_by_supervisor SMALLINT NOT NULL DEFAULT 0,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT (now()),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT (now()),
+  smp_server_key_hash BYTEA,
+  ntf_failed SMALLINT DEFAULT 0,
+  smp_failed SMALLINT DEFAULT 0,
+  PRIMARY KEY(conn_id),
+  FOREIGN KEY(smp_host, smp_port) REFERENCES servers(host, port)
+  ON DELETE SET NULL ON UPDATE CASCADE,
+  FOREIGN KEY(ntf_host, ntf_port) REFERENCES ntf_servers
+  ON DELETE RESTRICT ON UPDATE CASCADE
+);
+CREATE TABLE commands(
+  command_id BIGINT PRIMARY KEY GENERATED ALWAYS AS IDENTITY,
+  conn_id BYTEA NOT NULL REFERENCES connections ON DELETE CASCADE,
+  host TEXT,
+  port TEXT,
+  corr_id BYTEA NOT NULL,
+  command_tag BYTEA NOT NULL,
+  command BYTEA NOT NULL,
+  agent_version INTEGER NOT NULL DEFAULT 1,
+  server_key_hash BYTEA,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT '1970-01-01 00:00:00',
+  failed SMALLINT DEFAULT 0,
+  FOREIGN KEY(host, port) REFERENCES servers
+  ON DELETE RESTRICT ON UPDATE CASCADE
+);
+CREATE TABLE snd_message_deliveries(
+  snd_message_delivery_id BIGINT PRIMARY KEY GENERATED ALWAYS AS IDENTITY,
+  conn_id BYTEA NOT NULL REFERENCES connections ON DELETE CASCADE,
+  snd_queue_id BIGINT NOT NULL,
+  internal_id BIGINT NOT NULL,
+  failed SMALLINT DEFAULT 0,
+  FOREIGN KEY(conn_id, internal_id) REFERENCES messages ON DELETE CASCADE DEFERRABLE INITIALLY DEFERRED
+);
+CREATE TABLE xftp_servers(
+  xftp_server_id BIGINT PRIMARY KEY GENERATED ALWAYS AS IDENTITY,
+  xftp_host TEXT NOT NULL,
+  xftp_port TEXT NOT NULL,
+  xftp_key_hash BYTEA NOT NULL,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT (now()),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT (now()),
+  UNIQUE(xftp_host, xftp_port, xftp_key_hash)
+);
+CREATE TABLE rcv_files(
+  rcv_file_id BIGINT PRIMARY KEY GENERATED ALWAYS AS IDENTITY,
+  rcv_file_entity_id BYTEA NOT NULL,
+  user_id BIGINT NOT NULL REFERENCES users ON DELETE CASCADE,
+  size BIGINT NOT NULL,
+  digest BYTEA NOT NULL,
+  key BYTEA NOT NULL,
+  nonce BYTEA NOT NULL,
+  chunk_size BIGINT NOT NULL,
+  prefix_path TEXT NOT NULL,
+  tmp_path TEXT,
+  save_path TEXT NOT NULL,
+  status TEXT NOT NULL,
+  deleted SMALLINT NOT NULL DEFAULT 0,
+  error TEXT,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT (now()),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT (now()),
+  save_file_key BYTEA,
+  save_file_nonce BYTEA,
+  failed SMALLINT DEFAULT 0,
+  redirect_id BIGINT REFERENCES rcv_files ON DELETE SET NULL,
+  redirect_entity_id BYTEA,
+  redirect_size BIGINT,
+  redirect_digest BYTEA,
+  approved_relays SMALLINT NOT NULL DEFAULT 0,
+  UNIQUE(rcv_file_entity_id)
+);
+CREATE TABLE rcv_file_chunks(
+  rcv_file_chunk_id BIGINT PRIMARY KEY GENERATED ALWAYS AS IDENTITY,
+  rcv_file_id BIGINT NOT NULL REFERENCES rcv_files ON DELETE CASCADE,
+  chunk_no BIGINT NOT NULL,
+  chunk_size BIGINT NOT NULL,
+  digest BYTEA NOT NULL,
+  tmp_path TEXT,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT (now()),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT (now())
+);
+CREATE TABLE rcv_file_chunk_replicas(
+  rcv_file_chunk_replica_id BIGINT PRIMARY KEY GENERATED ALWAYS AS IDENTITY,
+  rcv_file_chunk_id BIGINT NOT NULL REFERENCES rcv_file_chunks ON DELETE CASCADE,
+  replica_number BIGINT NOT NULL,
+  xftp_server_id BIGINT NOT NULL REFERENCES xftp_servers ON DELETE CASCADE,
+  replica_id BYTEA NOT NULL,
+  replica_key BYTEA NOT NULL,
+  received SMALLINT NOT NULL DEFAULT 0,
+  delay BIGINT,
+  retries BIGINT NOT NULL DEFAULT 0,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT (now()),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT (now())
+);
+CREATE TABLE snd_files(
+  snd_file_id BIGINT PRIMARY KEY GENERATED ALWAYS AS IDENTITY,
+  snd_file_entity_id BYTEA NOT NULL,
+  user_id BIGINT NOT NULL REFERENCES users ON DELETE CASCADE,
+  num_recipients BIGINT NOT NULL,
+  digest BYTEA,
+  key BYTEA NOT NUll,
+  nonce BYTEA NOT NUll,
+  path TEXT NOT NULL,
+  prefix_path TEXT,
+  status TEXT NOT NULL,
+  deleted SMALLINT NOT NULL DEFAULT 0,
+  error TEXT,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT (now()),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT (now()),
+  src_file_key BYTEA,
+  src_file_nonce BYTEA,
+  failed SMALLINT DEFAULT 0,
+  redirect_size BIGINT,
+  redirect_digest BYTEA
+);
+CREATE TABLE snd_file_chunks(
+  snd_file_chunk_id BIGINT PRIMARY KEY GENERATED ALWAYS AS IDENTITY,
+  snd_file_id BIGINT NOT NULL REFERENCES snd_files ON DELETE CASCADE,
+  chunk_no BIGINT NOT NULL,
+  chunk_offset BIGINT NOT NULL,
+  chunk_size BIGINT NOT NULL,
+  digest BYTEA NOT NULL,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT (now()),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT (now())
+);
+CREATE TABLE snd_file_chunk_replicas(
+  snd_file_chunk_replica_id BIGINT PRIMARY KEY GENERATED ALWAYS AS IDENTITY,
+  snd_file_chunk_id BIGINT NOT NULL REFERENCES snd_file_chunks ON DELETE CASCADE,
+  replica_number BIGINT NOT NULL,
+  xftp_server_id BIGINT NOT NULL REFERENCES xftp_servers ON DELETE CASCADE,
+  replica_id BYTEA NOT NULL,
+  replica_key BYTEA NOT NULL,
+  replica_status TEXT NOT NULL,
+  delay BIGINT,
+  retries BIGINT NOT NULL DEFAULT 0,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT (now()),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT (now())
+);
+CREATE TABLE snd_file_chunk_replica_recipients(
+  snd_file_chunk_replica_recipient_id BIGINT PRIMARY KEY GENERATED ALWAYS AS IDENTITY,
+  snd_file_chunk_replica_id BIGINT NOT NULL REFERENCES snd_file_chunk_replicas ON DELETE CASCADE,
+  rcv_replica_id BYTEA NOT NULL,
+  rcv_replica_key BYTEA NOT NULL,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT (now()),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT (now())
+);
+CREATE TABLE deleted_snd_chunk_replicas(
+  deleted_snd_chunk_replica_id BIGINT PRIMARY KEY GENERATED ALWAYS AS IDENTITY,
+  user_id BIGINT NOT NULL REFERENCES users ON DELETE CASCADE,
+  xftp_server_id BIGINT NOT NULL REFERENCES xftp_servers ON DELETE CASCADE,
+  replica_id BYTEA NOT NULL,
+  replica_key BYTEA NOT NULL,
+  chunk_digest BYTEA NOT NULL,
+  delay BIGINT,
+  retries BIGINT NOT NULL DEFAULT 0,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT (now()),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT (now()),
+  failed SMALLINT DEFAULT 0
+);
+CREATE TABLE encrypted_rcv_message_hashes(
+  encrypted_rcv_message_hash_id BIGINT PRIMARY KEY GENERATED ALWAYS AS IDENTITY,
+  conn_id BYTEA NOT NULL REFERENCES connections ON DELETE CASCADE,
+  hash BYTEA NOT NULL,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT (now()),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT (now())
+);
+CREATE TABLE processed_ratchet_key_hashes(
+  processed_ratchet_key_hash_id BIGINT PRIMARY KEY GENERATED ALWAYS AS IDENTITY,
+  conn_id BYTEA NOT NULL REFERENCES connections ON DELETE CASCADE,
+  hash BYTEA NOT NULL,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT (now()),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT (now())
+);
+CREATE TABLE servers_stats(
+  servers_stats_id BIGINT PRIMARY KEY GENERATED ALWAYS AS IDENTITY,
+  servers_stats TEXT,
+  started_at TIMESTAMPTZ NOT NULL DEFAULT (now()),
+  created_at TIMESTAMPTZ NOT NULL DEFAULT (now()),
+  updated_at TIMESTAMPTZ NOT NULL DEFAULT (now())
+);
+INSERT INTO servers_stats DEFAULT VALUES;
+CREATE TABLE ntf_tokens_to_delete(
+  ntf_token_to_delete_id BIGINT PRIMARY KEY GENERATED ALWAYS AS IDENTITY,
+  ntf_host TEXT NOT NULL,
+  ntf_port TEXT NOT NULL,
+  ntf_key_hash BYTEA NOT NULL,
+  tkn_id BYTEA NOT NULL,
+  tkn_priv_key BYTEA NOT NULL,
+  del_failed SMALLINT DEFAULT 0,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT (now())
+);
+CREATE UNIQUE INDEX idx_rcv_queues_ntf ON rcv_queues(host, port, ntf_id);
+CREATE UNIQUE INDEX idx_rcv_queue_id ON rcv_queues(conn_id, rcv_queue_id);
+CREATE UNIQUE INDEX idx_snd_queue_id ON snd_queues(conn_id, snd_queue_id);
+CREATE INDEX idx_snd_message_deliveries ON snd_message_deliveries(
+  conn_id,
+  snd_queue_id
+);
+CREATE INDEX idx_connections_user ON connections(user_id);
+CREATE INDEX idx_commands_conn_id ON commands(conn_id);
+CREATE INDEX idx_commands_host_port ON commands(host, port);
+CREATE INDEX idx_conn_confirmations_conn_id ON conn_confirmations(conn_id);
+CREATE INDEX idx_conn_invitations_contact_conn_id ON conn_invitations(
+  contact_conn_id
+);
+CREATE INDEX idx_messages_conn_id_internal_snd_id ON messages(
+  conn_id,
+  internal_snd_id
+);
+CREATE INDEX idx_messages_conn_id_internal_rcv_id ON messages(
+  conn_id,
+  internal_rcv_id
+);
+CREATE INDEX idx_messages_conn_id ON messages(conn_id);
+CREATE INDEX idx_ntf_subscriptions_ntf_host_ntf_port ON ntf_subscriptions(
+  ntf_host,
+  ntf_port
+);
+CREATE INDEX idx_ntf_subscriptions_smp_host_smp_port ON ntf_subscriptions(
+  smp_host,
+  smp_port
+);
+CREATE INDEX idx_ntf_tokens_ntf_host_ntf_port ON ntf_tokens(
+  ntf_host,
+  ntf_port
+);
+CREATE INDEX idx_ratchets_conn_id ON ratchets(conn_id);
+CREATE INDEX idx_rcv_messages_conn_id_internal_id ON rcv_messages(
+  conn_id,
+  internal_id
+);
+CREATE INDEX idx_skipped_messages_conn_id ON skipped_messages(conn_id);
+CREATE INDEX idx_snd_message_deliveries_conn_id_internal_id ON snd_message_deliveries(
+  conn_id,
+  internal_id
+);
+CREATE INDEX idx_snd_messages_conn_id_internal_id ON snd_messages(
+  conn_id,
+  internal_id
+);
+CREATE INDEX idx_snd_queues_host_port ON snd_queues(host, port);
+CREATE INDEX idx_rcv_files_user_id ON rcv_files(user_id);
+CREATE INDEX idx_rcv_file_chunks_rcv_file_id ON rcv_file_chunks(rcv_file_id);
+CREATE INDEX idx_rcv_file_chunk_replicas_rcv_file_chunk_id ON rcv_file_chunk_replicas(
+  rcv_file_chunk_id
+);
+CREATE INDEX idx_rcv_file_chunk_replicas_xftp_server_id ON rcv_file_chunk_replicas(
+  xftp_server_id
+);
+CREATE INDEX idx_snd_files_user_id ON snd_files(user_id);
+CREATE INDEX idx_snd_file_chunks_snd_file_id ON snd_file_chunks(snd_file_id);
+CREATE INDEX idx_snd_file_chunk_replicas_snd_file_chunk_id ON snd_file_chunk_replicas(
+  snd_file_chunk_id
+);
+CREATE INDEX idx_snd_file_chunk_replicas_xftp_server_id ON snd_file_chunk_replicas(
+  xftp_server_id
+);
+CREATE INDEX idx_snd_file_chunk_replica_recipients_snd_file_chunk_replica_id ON snd_file_chunk_replica_recipients(
+  snd_file_chunk_replica_id
+);
+CREATE INDEX idx_deleted_snd_chunk_replicas_user_id ON deleted_snd_chunk_replicas(
+  user_id
+);
+CREATE INDEX idx_deleted_snd_chunk_replicas_xftp_server_id ON deleted_snd_chunk_replicas(
+  xftp_server_id
+);
+CREATE INDEX idx_rcv_file_chunk_replicas_pending ON rcv_file_chunk_replicas(
+  received,
+  replica_number
+);
+CREATE INDEX idx_snd_file_chunk_replicas_pending ON snd_file_chunk_replicas(
+  replica_status,
+  replica_number
+);
+CREATE INDEX idx_deleted_snd_chunk_replicas_pending ON deleted_snd_chunk_replicas(
+  created_at
+);
+CREATE INDEX idx_encrypted_rcv_message_hashes_hash ON encrypted_rcv_message_hashes(
+  conn_id,
+  hash
+);
+CREATE INDEX idx_processed_ratchet_key_hashes_hash ON processed_ratchet_key_hashes(
+  conn_id,
+  hash
+);
+CREATE INDEX idx_snd_messages_rcpt_internal_id ON snd_messages(
+  conn_id,
+  rcpt_internal_id
+);
+CREATE INDEX idx_processed_ratchet_key_hashes_created_at ON processed_ratchet_key_hashes(
+  created_at
+);
+CREATE INDEX idx_encrypted_rcv_message_hashes_created_at ON encrypted_rcv_message_hashes(
+  created_at
+);
+CREATE INDEX idx_messages_internal_ts ON messages(internal_ts);
+CREATE INDEX idx_commands_server_commands ON commands(
+  host,
+  port,
+  created_at,
+  command_id
+);
+CREATE INDEX idx_rcv_files_status_created_at ON rcv_files(status, created_at);
+CREATE INDEX idx_snd_files_status_created_at ON snd_files(status, created_at);
+CREATE INDEX idx_snd_files_snd_file_entity_id ON snd_files(snd_file_entity_id);
+CREATE INDEX idx_messages_snd_expired ON messages(
+  conn_id,
+  internal_snd_id,
+  internal_ts
+);
+CREATE INDEX idx_snd_message_deliveries_expired ON snd_message_deliveries(
+  conn_id,
+  snd_queue_id,
+  failed,
+  internal_id
+);
+CREATE INDEX idx_rcv_files_redirect_id on rcv_files(redirect_id);
+|]

src/Simplex/Messaging/Agent/Store/Postgres/Util.hs

@@ -0,0 +1,100 @@
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE QuasiQuotes #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+
+module Simplex.Messaging.Agent.Store.Postgres.Util
+  ( createDBAndUserIfNotExists,
+    dropSchema,
+    dropAllSchemasExceptSystem,
+    dropDatabaseAndUser,
+  )
+where
+
+import Control.Exception (bracket)
+import Control.Monad (forM_, unless, void, when)
+import Data.String (fromString)
+import Database.PostgreSQL.Simple (ConnectInfo (..), Only (..), defaultConnectInfo)
+import qualified Database.PostgreSQL.Simple as PSQL
+import Database.PostgreSQL.Simple.SqlQQ (sql)
+
+createDBAndUserIfNotExists :: ConnectInfo -> IO ()
+createDBAndUserIfNotExists ConnectInfo {connectUser = user, connectDatabase = dbName} = do
+  -- connect to the default "postgres" maintenance database
+  bracket (PSQL.connect defaultConnectInfo {connectUser = "postgres", connectDatabase = "postgres"}) PSQL.close $
+    \postgresDB -> do
+      void $ PSQL.execute_ postgresDB "SET client_min_messages TO WARNING"
+      -- check if the user exists, create if not
+      [Only userExists] <-
+        PSQL.query
+          postgresDB
+          [sql|
+            SELECT EXISTS (
+              SELECT 1 FROM pg_catalog.pg_roles
+              WHERE rolname = ?
+            )
+          |]
+          (Only user)
+      unless userExists $ void $ PSQL.execute_ postgresDB (fromString $ "CREATE USER " <> user)
+      -- check if the database exists, create if not
+      dbExists <- checkDBExists postgresDB dbName
+      unless dbExists $ void $ PSQL.execute_ postgresDB (fromString $ "CREATE DATABASE " <> dbName <> " OWNER " <> user)
+
+checkDBExists :: PSQL.Connection -> String -> IO Bool
+checkDBExists postgresDB dbName = do
+  [Only dbExists] <-
+    PSQL.query
+      postgresDB
+      [sql|
+        SELECT EXISTS (
+          SELECT 1 FROM pg_catalog.pg_database
+          WHERE datname = ?
+        )
+      |]
+      (Only dbName)
+  pure dbExists
+
+dropSchema :: ConnectInfo -> String -> IO ()
+dropSchema connectInfo schema =
+  bracket (PSQL.connect connectInfo) PSQL.close $
+    \db -> do
+      void $ PSQL.execute_ db "SET client_min_messages TO WARNING"
+      void $ PSQL.execute_ db (fromString $ "DROP SCHEMA IF EXISTS " <> schema <> " CASCADE")
+
+dropAllSchemasExceptSystem :: ConnectInfo -> IO ()
+dropAllSchemasExceptSystem connectInfo =
+  bracket (PSQL.connect connectInfo) PSQL.close $
+    \db -> do
+      void $ PSQL.execute_ db "SET client_min_messages TO WARNING"
+      schemaNames :: [Only String] <-
+        PSQL.query_
+          db
+          [sql|
+            SELECT schema_name
+            FROM information_schema.schemata
+            WHERE schema_name NOT IN ('public', 'pg_catalog', 'information_schema')
+          |]
+      forM_ schemaNames $ \(Only schema) ->
+        PSQL.execute_ db (fromString $ "DROP SCHEMA " <> schema <> " CASCADE")
+
+dropDatabaseAndUser :: ConnectInfo -> IO ()
+dropDatabaseAndUser ConnectInfo {connectUser = user, connectDatabase = dbName} =
+  bracket (PSQL.connect defaultConnectInfo {connectUser = "postgres", connectDatabase = "postgres"}) PSQL.close $
+    \postgresDB -> do
+      void $ PSQL.execute_ postgresDB "SET client_min_messages TO WARNING"
+      dbExists <- checkDBExists postgresDB dbName
+      when dbExists $ do
+        void $ PSQL.execute_ postgresDB (fromString $ "ALTER DATABASE " <> dbName <> " WITH ALLOW_CONNECTIONS false")
+        -- terminate all connections to the database
+        _r :: [Only Bool] <-
+          PSQL.query
+            postgresDB
+            [sql|
+              SELECT pg_terminate_backend(pg_stat_activity.pid)
+              FROM pg_stat_activity
+              WHERE datname = ?
+                AND pid <> pg_backend_pid()
+            |]
+            (Only dbName)
+        void $ PSQL.execute_ postgresDB (fromString $ "DROP DATABASE " <> dbName)
+      void $ PSQL.execute_ postgresDB (fromString $ "DROP USER IF EXISTS " <> user)

src/Simplex/Messaging/Agent/Store/SQLite/Common.hs

@@ -4,7 +4,7 @@
 {-# LANGUAGE ScopedTypeVariables #-}
 
 module Simplex.Messaging.Agent.Store.SQLite.Common
-  ( SQLiteStore (..),
+  ( DBStore (..),
     withConnection,
     withConnection',
     withTransaction,
@@ -30,7 +30,7 @@ import UnliftIO.STM
 storeKey :: ScrubbedBytes -> Bool -> Maybe ScrubbedBytes
 storeKey key keepKey = if keepKey || BA.null key then Just key else Nothing
 
-data SQLiteStore = SQLiteStore
+data DBStore = DBStore
   { dbFilePath :: FilePath,
     dbKey :: TVar (Maybe ScrubbedBytes),
     dbSem :: TVar Int,
@@ -39,8 +39,8 @@ data SQLiteStore = SQLiteStore
     dbNew :: Bool
   }
 
-withConnectionPriority :: SQLiteStore -> Bool -> (DB.Connection -> IO a) -> IO a
-withConnectionPriority SQLiteStore {dbSem, dbConnection} priority action
+withConnectionPriority :: DBStore -> Bool -> (DB.Connection -> IO a) -> IO a
+withConnectionPriority DBStore {dbSem, dbConnection} priority action
   | priority = E.bracket_ signal release $ withMVar dbConnection action
   | otherwise = lowPriority
   where
@@ -50,20 +50,20 @@ withConnectionPriority SQLiteStore {dbSem, dbConnection} priority action
     wait = unlessM free $ atomically $ unlessM ((0 ==) <$> readTVar dbSem) retry
     free = (0 ==) <$> readTVarIO dbSem
 
-withConnection :: SQLiteStore -> (DB.Connection -> IO a) -> IO a
+withConnection :: DBStore -> (DB.Connection -> IO a) -> IO a
 withConnection st = withConnectionPriority st False
 
-withConnection' :: SQLiteStore -> (SQL.Connection -> IO a) -> IO a
+withConnection' :: DBStore -> (SQL.Connection -> IO a) -> IO a
 withConnection' st action = withConnection st $ action . DB.conn
 
-withTransaction' :: SQLiteStore -> (SQL.Connection -> IO a) -> IO a
+withTransaction' :: DBStore -> (SQL.Connection -> IO a) -> IO a
 withTransaction' st action = withTransaction st $ action . DB.conn
 
-withTransaction :: SQLiteStore -> (DB.Connection -> IO a) -> IO a
+withTransaction :: DBStore -> (DB.Connection -> IO a) -> IO a
 withTransaction st = withTransactionPriority st False
 {-# INLINE withTransaction #-}
 
-withTransactionPriority :: SQLiteStore -> Bool -> (DB.Connection -> IO a) -> IO a
+withTransactionPriority :: DBStore -> Bool -> (DB.Connection -> IO a) -> IO a
 withTransactionPriority st priority action = withConnectionPriority st priority $ dbBusyLoop . transaction
   where
     transaction db@DB.Connection {conn} = SQL.withImmediateTransaction conn $ action db

src/Simplex/Messaging/Agent/Store/SQLite/DB.hs

@@ -1,45 +1,63 @@
 {-# LANGUAGE DeriveAnyClass #-}
+{-# LANGUAGE DerivingStrategies #-}
+{-# LANGUAGE GeneralizedNewtypeDeriving #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE StrictData #-}
 {-# LANGUAGE TemplateHaskell #-}
 
 module Simplex.Messaging.Agent.Store.SQLite.DB
-  ( Connection (..),
+  ( BoolInt (..),
+    Binary (..),
+    Connection (..),
     SlowQueryStats (..),
+    TrackQueries (..),
+    FromField (..),
+    ToField (..),
     open,
     close,
     execute,
     execute_,
-    executeNamed,
     executeMany,
     query,
     query_,
-    queryNamed,
   )
 where
 
 import Control.Concurrent.STM
-import Control.Monad (when)
 import Control.Exception
+import Control.Monad (when)
 import qualified Data.Aeson.TH as J
+import Data.ByteString (ByteString)
 import Data.Int (Int64)
 import Data.Map.Strict (Map)
 import qualified Data.Map.Strict as M
 import Data.Text (Text)
 import Data.Time (diffUTCTime, getCurrentTime)
-import Database.SQLite.Simple (FromRow, NamedParam, Query, ToRow)
+import Database.SQLite.Simple (FromRow, Query, ToRow)
 import qualified Database.SQLite.Simple as SQL
+import Database.SQLite.Simple.FromField (FromField (..))
+import Database.SQLite.Simple.ToField (ToField (..))
 import Simplex.Messaging.Parsers (defaultJSON)
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
-import Simplex.Messaging.Util (diffToMilliseconds, tshow)
+import Simplex.Messaging.Util (diffToMicroseconds, tshow)
+
+newtype BoolInt = BI {unBI :: Bool}
+  deriving newtype (FromField, ToField)
+
+newtype Binary = Binary {fromBinary :: ByteString}
+  deriving newtype (FromField, ToField)
 
 data Connection = Connection
   { conn :: SQL.Connection,
+    track :: TrackQueries,
     slow :: TMap Query SlowQueryStats
   }
 
+data TrackQueries = TQAll | TQSlow Int64 | TQOff
+  deriving (Eq)
+
 data SlowQueryStats = SlowQueryStats
   { count :: Int64,
     timeMax :: Int64,
@@ -48,21 +66,29 @@ data SlowQueryStats = SlowQueryStats
   }
   deriving (Show)
 
-timeIt :: TMap Query SlowQueryStats -> Query -> IO a -> IO a
-timeIt slow sql a = do
-  t <- getCurrentTime
-  r <- a `catch` \e -> do
-    atomically $ TM.alter (Just . updateQueryErrors e) sql slow
-    throwIO e
-  t' <- getCurrentTime
-  let diff = diffToMilliseconds $ diffUTCTime t' t
-  when (diff > 1) $ atomically $ TM.alter (updateQueryStats diff) sql slow
-  pure r
+timeIt :: Connection -> Query -> IO a -> IO a
+timeIt Connection {slow, track} sql a
+  | track == TQOff = makeQuery
+  | otherwise = do
+      t <- getCurrentTime
+      r <- makeQuery
+      t' <- getCurrentTime
+      let diff = diffToMicroseconds $ diffUTCTime t' t
+      when (trackQuery diff) $ atomically $ TM.alter (updateQueryStats diff) sql slow
+      pure r
   where
+    makeQuery =
+      a `catch` \e -> do
+        atomically $ TM.alter (Just . updateQueryErrors e) sql slow
+        throwIO e
+    trackQuery diff = case track of
+      TQOff -> False
+      TQSlow t -> diff > t
+      TQAll -> True
     updateQueryErrors :: SomeException -> Maybe SlowQueryStats -> SlowQueryStats
     updateQueryErrors e Nothing = SlowQueryStats 0 0 0 $ M.singleton (tshow e) 1
-    updateQueryErrors e (Just stats@SlowQueryStats {errs}) =
-      stats {errs = M.alter (Just . maybe 1 (+ 1)) (tshow e) errs}
+    updateQueryErrors e (Just st@SlowQueryStats {errs}) =
+      st {errs = M.alter (Just . maybe 1 (+ 1)) (tshow e) errs}
     updateQueryStats :: Int64 -> Maybe SlowQueryStats -> Maybe SlowQueryStats
     updateQueryStats diff Nothing = Just $ SlowQueryStats 1 diff diff M.empty
     updateQueryStats diff (Just SlowQueryStats {count, timeMax, timeAvg, errs}) =
@@ -74,41 +100,33 @@ timeIt slow sql a = do
             errs
           }
 
-open :: String -> IO Connection
-open f = do
+open :: String -> TrackQueries -> IO Connection
+open f track = do
   conn <- SQL.open f
   slow <- TM.emptyIO
-  pure Connection {conn, slow}
+  pure Connection {conn, slow, track}
 
 close :: Connection -> IO ()
 close = SQL.close . conn
 
 execute :: ToRow q => Connection -> Query -> q -> IO ()
-execute Connection {conn, slow} sql = timeIt slow sql . SQL.execute conn sql
+execute c sql = timeIt c sql . SQL.execute (conn c) sql
 {-# INLINE execute #-}
 
 execute_ :: Connection -> Query -> IO ()
-execute_ Connection {conn, slow} sql = timeIt slow sql $ SQL.execute_ conn sql
+execute_ c sql = timeIt c sql $ SQL.execute_ (conn c) sql
 {-# INLINE execute_ #-}
 
-executeNamed :: Connection -> Query -> [NamedParam] -> IO ()
-executeNamed Connection {conn, slow} sql = timeIt slow sql . SQL.executeNamed conn sql
-{-# INLINE executeNamed #-}
-
 executeMany :: ToRow q => Connection -> Query -> [q] -> IO ()
-executeMany Connection {conn, slow} sql = timeIt slow sql . SQL.executeMany conn sql
+executeMany c sql = timeIt c sql . SQL.executeMany (conn c) sql
 {-# INLINE executeMany #-}
 
 query :: (ToRow q, FromRow r) => Connection -> Query -> q -> IO [r]
-query Connection {conn, slow} sql = timeIt slow sql . SQL.query conn sql
+query c sql = timeIt c sql . SQL.query (conn c) sql
 {-# INLINE query #-}
 
 query_ :: FromRow r => Connection -> Query -> IO [r]
-query_ Connection {conn, slow} sql = timeIt slow sql $ SQL.query_ conn sql
+query_ c sql = timeIt c sql $ SQL.query_ (conn c) sql
 {-# INLINE query_ #-}
 
-queryNamed :: FromRow r => Connection -> Query -> [NamedParam] -> IO [r]
-queryNamed Connection {conn, slow} sql = timeIt slow sql . SQL.queryNamed conn sql
-{-# INLINE queryNamed #-}
-
 $(J.deriveJSON defaultJSON ''SlowQueryStats)

src/Simplex/Messaging/Agent/Store/SQLite/Migrations.hs

@@ -5,40 +5,29 @@
 {-# LANGUAGE QuasiQuotes #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE StrictData #-}
-{-# LANGUAGE TemplateHaskell #-}
 {-# LANGUAGE TupleSections #-}
 
 module Simplex.Messaging.Agent.Store.SQLite.Migrations
-  ( Migration (..),
-    MigrationsToRun (..),
-    MTRError (..),
-    DownMigration (..),
-    app,
+  ( app,
     initialize,
-    get,
     run,
     getCurrent,
-    mtrErrorDescription,
-    -- for unit tests
-    migrationsToRun,
-    toDownMigration,
   )
 where
 
 import Control.Monad (forM_, when)
-import qualified Data.Aeson.TH as J
-import Data.List (intercalate, sortOn)
+import Data.List (sortOn)
 import Data.List.NonEmpty (NonEmpty)
-import qualified Data.Map as M
-import Data.Maybe (isNothing, mapMaybe)
+import qualified Data.Map.Strict as M
 import Data.Text (Text)
 import Data.Text.Encoding (decodeLatin1)
 import Data.Time.Clock (getCurrentTime)
-import Database.SQLite.Simple (Connection, Only (..), Query (..))
-import qualified Database.SQLite.Simple as DB
+import Database.SQLite.Simple (Only (..), Query (..))
+import qualified Database.SQLite.Simple as SQL
 import Database.SQLite.Simple.QQ (sql)
 import qualified Database.SQLite3 as SQLite3
 import Simplex.Messaging.Agent.Protocol (extraSMPServerHosts)
+import qualified Simplex.Messaging.Agent.Store.DB as DB
 import Simplex.Messaging.Agent.Store.SQLite.Common
 import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220101_initial
 import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220301_snd_queue_keys
@@ -74,13 +63,13 @@ import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240225_ratchet_kem
 import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240417_rcv_files_approved_relays
 import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240624_snd_secure
 import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240702_servers_stats
+import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240930_ntf_tokens_to_delete
+import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20241007_rcv_queues_last_broker_ts
+import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20241224_ratchet_e2e_snd_params
+import Simplex.Messaging.Agent.Store.Shared
 import Simplex.Messaging.Encoding.String
-import Simplex.Messaging.Parsers (dropPrefix, sumTypeJSON)
 import Simplex.Messaging.Transport.Client (TransportHost)
 
-data Migration = Migration {name :: String, up :: Text, down :: Maybe Text}
-  deriving (Eq, Show)
-
 schemaMigrations :: [(String, Query, Maybe Query)]
 schemaMigrations =
   [ ("20220101_initial", m20220101_initial, Nothing),
@@ -116,7 +105,10 @@ schemaMigrations =
     ("m20240225_ratchet_kem", m20240225_ratchet_kem, Just down_m20240225_ratchet_kem),
     ("m20240417_rcv_files_approved_relays", m20240417_rcv_files_approved_relays, Just down_m20240417_rcv_files_approved_relays),
     ("m20240624_snd_secure", m20240624_snd_secure, Just down_m20240624_snd_secure),
-    ("m20240702_servers_stats", m20240702_servers_stats, Just down_m20240702_servers_stats)
+    ("m20240702_servers_stats", m20240702_servers_stats, Just down_m20240702_servers_stats),
+    ("m20240930_ntf_tokens_to_delete", m20240930_ntf_tokens_to_delete, Just down_m20240930_ntf_tokens_to_delete),
+    ("m20241007_rcv_queues_last_broker_ts", m20241007_rcv_queues_last_broker_ts, Just down_m20241007_rcv_queues_last_broker_ts),
+    ("m20241224_ratchet_e2e_snd_params", m20241224_ratchet_e2e_snd_params, Just down_m20241224_ratchet_e2e_snd_params)
   ]
 
 -- | The list of migrations in ascending order by date
@@ -125,18 +117,17 @@ app = sortOn name $ map migration schemaMigrations
   where
     migration (name, up, down) = Migration {name, up = fromQuery up, down = fromQuery <$> down}
 
-get :: SQLiteStore -> [Migration] -> IO (Either MTRError MigrationsToRun)
-get st migrations = migrationsToRun migrations <$> withTransaction' st getCurrent
-
-getCurrent :: Connection -> IO [Migration]
-getCurrent db = map toMigration <$> DB.query_ db "SELECT name, down FROM migrations ORDER BY name ASC;"
+getCurrent :: DB.Connection -> IO [Migration]
+getCurrent DB.Connection {DB.conn} = map toMigration <$> SQL.query_ conn "SELECT name, down FROM migrations ORDER BY name ASC;"
   where
     toMigration (name, down) = Migration {name, up = "", down}
 
-run :: SQLiteStore -> MigrationsToRun -> IO ()
-run st = \case
+run :: DBStore -> Bool -> MigrationsToRun -> IO ()
+run st vacuum = \case
   MTRUp [] -> pure ()
-  MTRUp ms -> mapM_ runUp ms >> withConnection' st (`execSQL` "VACUUM;")
+  MTRUp ms -> do
+    mapM_ runUp ms
+    when vacuum $ withConnection' st (`execSQL` "VACUUM;")
   MTRDown ms -> mapM_ runDown $ reverse ms
   MTRNone -> pure ()
   where
@@ -144,27 +135,27 @@ run st = \case
       when (name == "m20220811_onion_hosts") $ updateServers db
       insert db >> execSQL db up'
       where
-        insert db = DB.execute db "INSERT INTO migrations (name, down, ts) VALUES (?,?,?)" . (name,down,) =<< getCurrentTime
+        insert db = SQL.execute db "INSERT INTO migrations (name, down, ts) VALUES (?,?,?)" . (name,down,) =<< getCurrentTime
         up'
           | dbNew st && name == "m20230110_users" = fromQuery new_m20230110_users
           | otherwise = up
         updateServers db = forM_ (M.assocs extraSMPServerHosts) $ \(h, h') ->
           let hs = decodeLatin1 . strEncode $ ([h, h'] :: NonEmpty TransportHost)
-           in DB.execute db "UPDATE servers SET host = ? WHERE host = ?" (hs, decodeLatin1 $ strEncode h)
+           in SQL.execute db "UPDATE servers SET host = ? WHERE host = ?" (hs, decodeLatin1 $ strEncode h)
     runDown DownMigration {downName, downQuery} = withTransaction' st $ \db -> do
       execSQL db downQuery
-      DB.execute db "DELETE FROM migrations WHERE name = ?" (Only downName)
-    execSQL db = SQLite3.exec $ DB.connectionHandle db
+      SQL.execute db "DELETE FROM migrations WHERE name = ?" (Only downName)
+    execSQL db = SQLite3.exec $ SQL.connectionHandle db
 
-initialize :: SQLiteStore -> IO ()
+initialize :: DBStore -> IO ()
 initialize st = withTransaction' st $ \db -> do
-  cs :: [Text] <- map fromOnly <$> DB.query_ db "SELECT name FROM pragma_table_info('migrations')"
+  cs :: [Text] <- map fromOnly <$> SQL.query_ db "SELECT name FROM pragma_table_info('migrations')"
   case cs of
     [] -> createMigrations db
-    _ -> when ("down" `notElem` cs) $ DB.execute_ db "ALTER TABLE migrations ADD COLUMN down TEXT"
+    _ -> when ("down" `notElem` cs) $ SQL.execute_ db "ALTER TABLE migrations ADD COLUMN down TEXT"
   where
     createMigrations db =
-      DB.execute_
+      SQL.execute_
         db
         [sql|
           CREATE TABLE IF NOT EXISTS migrations (
@@ -174,37 +165,3 @@ initialize st = withTransaction' st $ \db -> do
             PRIMARY KEY (name)
           );
         |]
-
-data DownMigration = DownMigration {downName :: String, downQuery :: Text}
-  deriving (Eq, Show)
-
-toDownMigration :: Migration -> Maybe DownMigration
-toDownMigration Migration {name, down} = DownMigration name <$> down
-
-data MigrationsToRun = MTRUp [Migration] | MTRDown [DownMigration] | MTRNone
-  deriving (Eq, Show)
-
-data MTRError
-  = MTRENoDown {dbMigrations :: [String]}
-  | MTREDifferent {appMigration :: String, dbMigration :: String}
-  deriving (Eq, Show)
-
-mtrErrorDescription :: MTRError -> String
-mtrErrorDescription = \case
-  MTRENoDown ms -> "database version is newer than the app, but no down migration for: " <> intercalate ", " ms
-  MTREDifferent a d -> "different migration in the app/database: " <> a <> " / " <> d
-
-migrationsToRun :: [Migration] -> [Migration] -> Either MTRError MigrationsToRun
-migrationsToRun [] [] = Right MTRNone
-migrationsToRun appMs [] = Right $ MTRUp appMs
-migrationsToRun [] dbMs
-  | length dms == length dbMs = Right $ MTRDown dms
-  | otherwise = Left $ MTRENoDown $ mapMaybe nameNoDown dbMs
-  where
-    dms = mapMaybe toDownMigration dbMs
-    nameNoDown m = if isNothing (down m) then Just $ name m else Nothing
-migrationsToRun (a : as) (d : ds)
-  | name a == name d = migrationsToRun as ds
-  | otherwise = Left $ MTREDifferent (name a) (name d)
-
-$(J.deriveJSON (sumTypeJSON $ dropPrefix "MTRE") ''MTRError)

src/Simplex/Messaging/Agent/Store/SQLite/Migrations/M20240930_ntf_tokens_to_delete.hs

@@ -0,0 +1,27 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Messaging.Agent.Store.SQLite.Migrations.M20240930_ntf_tokens_to_delete where
+
+import Database.SQLite.Simple (Query)
+import Database.SQLite.Simple.QQ (sql)
+
+m20240930_ntf_tokens_to_delete :: Query
+m20240930_ntf_tokens_to_delete =
+    [sql|
+CREATE TABLE ntf_tokens_to_delete (
+  ntf_token_to_delete_id INTEGER PRIMARY KEY,
+  ntf_host TEXT NOT NULL,
+  ntf_port TEXT NOT NULL,
+  ntf_key_hash BLOB NOT NULL,
+  tkn_id BLOB NOT NULL, -- token ID assigned by notifications server
+  tkn_priv_key BLOB NOT NULL, -- client's private key to sign token commands,
+  del_failed INTEGER DEFAULT 0,
+  created_at TEXT NOT NULL DEFAULT (datetime('now'))
+);
+|]
+
+down_m20240930_ntf_tokens_to_delete :: Query
+down_m20240930_ntf_tokens_to_delete =
+    [sql|
+DROP TABLE ntf_tokens_to_delete;
+|]

src/Simplex/Messaging/Agent/Store/SQLite/Migrations/M20241007_rcv_queues_last_broker_ts.hs

@@ -0,0 +1,18 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Messaging.Agent.Store.SQLite.Migrations.M20241007_rcv_queues_last_broker_ts where
+
+import Database.SQLite.Simple (Query)
+import Database.SQLite.Simple.QQ (sql)
+
+m20241007_rcv_queues_last_broker_ts :: Query
+m20241007_rcv_queues_last_broker_ts =
+    [sql|
+ALTER TABLE rcv_queues ADD COLUMN last_broker_ts TEXT;
+|]
+
+down_m20241007_rcv_queues_last_broker_ts :: Query
+down_m20241007_rcv_queues_last_broker_ts =
+    [sql|
+ALTER TABLE rcv_queues DROP COLUMN last_broker_ts;
+|]

src/Simplex/Messaging/Agent/Store/SQLite/Migrations/M20241224_ratchet_e2e_snd_params.hs

@@ -0,0 +1,18 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Messaging.Agent.Store.SQLite.Migrations.M20241224_ratchet_e2e_snd_params where
+
+import Database.SQLite.Simple (Query)
+import Database.SQLite.Simple.QQ (sql)
+
+m20241224_ratchet_e2e_snd_params :: Query
+m20241224_ratchet_e2e_snd_params =
+    [sql|
+ALTER TABLE ratchets ADD COLUMN pq_pub_kem BLOB;
+|]
+
+down_m20241224_ratchet_e2e_snd_params :: Query
+down_m20241224_ratchet_e2e_snd_params =
+    [sql|
+ALTER TABLE ratchets DROP COLUMN pq_pub_kem;
+|]

src/Simplex/Messaging/Agent/Store/SQLite/Migrations/agent_lint.sql

@@ -0,0 +1 @@
+CREATE INDEX 'ratchets_conn_id' ON 'ratchets'('conn_id'); --> connections(conn_id)

src/Simplex/Messaging/Agent/Store/SQLite/Migrations/agent_schema.sql

@@ -56,6 +56,7 @@ CREATE TABLE rcv_queues(
   switch_status TEXT,
   deleted INTEGER NOT NULL DEFAULT 0,
   snd_secure INTEGER NOT NULL DEFAULT 0,
+  last_broker_ts TEXT,
   PRIMARY KEY(host, port, rcv_id),
   FOREIGN KEY(host, port) REFERENCES servers
   ON DELETE RESTRICT ON UPDATE CASCADE,
@@ -165,7 +166,8 @@ CREATE TABLE ratchets(
   ,
   x3dh_pub_key_1 BLOB,
   x3dh_pub_key_2 BLOB,
-  pq_priv_kem BLOB
+  pq_priv_kem BLOB,
+  pq_pub_kem BLOB
 ) WITHOUT ROWID;
 CREATE TABLE skipped_messages(
   skipped_message_id INTEGER PRIMARY KEY,
@@ -403,6 +405,16 @@ CREATE TABLE servers_stats(
   created_at TEXT NOT NULL DEFAULT(datetime('now')),
   updated_at TEXT NOT NULL DEFAULT(datetime('now'))
 );
+CREATE TABLE ntf_tokens_to_delete(
+  ntf_token_to_delete_id INTEGER PRIMARY KEY,
+  ntf_host TEXT NOT NULL,
+  ntf_port TEXT NOT NULL,
+  ntf_key_hash BLOB NOT NULL,
+  tkn_id BLOB NOT NULL, -- token ID assigned by notifications server
+  tkn_priv_key BLOB NOT NULL, -- client's private key to sign token commands,
+del_failed INTEGER DEFAULT 0,
+created_at TEXT NOT NULL DEFAULT(datetime('now'))
+);
 CREATE UNIQUE INDEX idx_rcv_queues_ntf ON rcv_queues(host, port, ntf_id);
 CREATE UNIQUE INDEX idx_rcv_queue_id ON rcv_queues(conn_id, rcv_queue_id);
 CREATE UNIQUE INDEX idx_snd_queue_id ON snd_queues(conn_id, snd_queue_id);

src/Simplex/Messaging/Agent/Store/Shared.hs

@@ -0,0 +1,93 @@
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE TemplateHaskell #-}
+
+module Simplex.Messaging.Agent.Store.Shared
+  ( Migration (..),
+    MigrationsToRun (..),
+    DownMigration (..),
+    MTRError (..),
+    mtrErrorDescription,
+    MigrationConfirmation (..),
+    MigrationError (..),
+    UpMigration (..),
+    migrationErrorDescription,
+    -- for tests
+    toDownMigration,
+    upMigration,
+  )
+where
+
+import qualified Data.Aeson.TH as J
+import qualified Data.Attoparsec.ByteString.Char8 as A
+import Data.List (intercalate)
+import Data.Maybe (isJust)
+import Data.Text (Text)
+import Simplex.Messaging.Encoding.String
+import Simplex.Messaging.Parsers (defaultJSON, dropPrefix, sumTypeJSON)
+
+data Migration = Migration {name :: String, up :: Text, down :: Maybe Text}
+  deriving (Eq, Show)
+
+data DownMigration = DownMigration {downName :: String, downQuery :: Text}
+  deriving (Eq, Show)
+
+toDownMigration :: Migration -> Maybe DownMigration
+toDownMigration Migration {name, down} = DownMigration name <$> down
+
+data MigrationsToRun = MTRUp [Migration] | MTRDown [DownMigration] | MTRNone
+  deriving (Eq, Show)
+
+data MTRError
+  = MTRENoDown {dbMigrations :: [String]}
+  | MTREDifferent {appMigration :: String, dbMigration :: String}
+  deriving (Eq, Show)
+
+mtrErrorDescription :: MTRError -> String
+mtrErrorDescription = \case
+  MTRENoDown ms -> "database version is newer than the app, but no down migration for: " <> intercalate ", " ms
+  MTREDifferent a d -> "different migration in the app/database: " <> a <> " / " <> d
+
+data MigrationError
+  = MEUpgrade {upMigrations :: [UpMigration]}
+  | MEDowngrade {downMigrations :: [String]}
+  | MigrationError {mtrError :: MTRError}
+  deriving (Eq, Show)
+
+migrationErrorDescription :: MigrationError -> String
+migrationErrorDescription = \case
+  MEUpgrade ums ->
+    "The app has a newer version than the database.\nConfirm to back up and upgrade using these migrations: " <> intercalate ", " (map upName ums)
+  MEDowngrade dms ->
+    "Database version is newer than the app.\nConfirm to back up and downgrade using these migrations: " <> intercalate ", " dms
+  MigrationError err -> mtrErrorDescription err
+
+data UpMigration = UpMigration {upName :: String, withDown :: Bool}
+  deriving (Eq, Show)
+
+upMigration :: Migration -> UpMigration
+upMigration Migration {name, down} = UpMigration name $ isJust down
+
+data MigrationConfirmation = MCYesUp | MCYesUpDown | MCConsole | MCError
+  deriving (Eq, Show)
+
+instance StrEncoding MigrationConfirmation where
+  strEncode = \case
+    MCYesUp -> "yesUp"
+    MCYesUpDown -> "yesUpDown"
+    MCConsole -> "console"
+    MCError -> "error"
+  strP =
+    A.takeByteString >>= \case
+      "yesUp" -> pure MCYesUp
+      "yesUpDown" -> pure MCYesUpDown
+      "console" -> pure MCConsole
+      "error" -> pure MCError
+      _ -> fail "invalid MigrationConfirmation"
+
+$(J.deriveJSON (sumTypeJSON $ dropPrefix "MTRE") ''MTRError)
+
+$(J.deriveJSON defaultJSON ''UpMigration)
+
+$(J.deriveToJSON (sumTypeJSON $ dropPrefix "ME") ''MigrationError)

src/Simplex/Messaging/Agent/TRcvQueues.hs

@@ -31,7 +31,7 @@ import Simplex.Messaging.Transport
 
 class Queue q where
   connId' :: q -> ConnId
-  qKey :: q -> (UserId, SMPServer, ConnId)
+  qKey :: q -> (UserId, SMPServer, RecipientId)
 
 -- the fields in this record have the same data with swapped keys for lookup efficiency,
 -- and all methods must maintain this invariant.
@@ -63,7 +63,7 @@ addQueue rq (TRcvQueues qs cs) = do
     addQ = Just . maybe (k :| []) (k <|)
     k = qKey rq
 
--- Save time by aggregating modifyTVar
+-- Save time by aggregating modifyTVar'
 batchAddQueues :: (Foldable t, Queue q) => TRcvQueues q -> t q -> STM ()
 batchAddQueues (TRcvQueues qs cs) rqs = do
   modifyTVar' qs $ \now -> foldl' (\rqs' rq -> M.insert (qKey rq) rq rqs') now rqs
@@ -97,7 +97,7 @@ getDelSessQueues tSess sessId' (TRcvQueues qs cs) = do
     delQ acc@(removed, qs') (sessId, rq)
       | rq `isSession` tSess && sessId == sessId' = (rq : removed, M.delete (qKey rq) qs')
       | otherwise = acc
-    delConn :: ([ConnId], M.Map ConnId (NonEmpty (UserId, SMPServer, ConnId))) -> RcvQueue -> ([ConnId], M.Map ConnId (NonEmpty (UserId, SMPServer, ConnId)))
+    delConn :: ([ConnId], M.Map ConnId (NonEmpty (UserId, SMPServer, RecipientId))) -> RcvQueue -> ([ConnId], M.Map ConnId (NonEmpty (UserId, SMPServer, RecipientId)))
     delConn (removed, cs') rq = M.alterF f cId cs'
       where
         cId = connId rq
@@ -113,7 +113,7 @@ isSession rq (uId, srv, connId_) =
 
 instance Queue RcvQueue where
   connId' = connId
-  qKey rq = (userId rq, server rq, connId rq)
+  qKey rq = (userId rq, server rq, rcvId rq)
 
 instance Queue (SessionId, RcvQueue) where
   connId' = connId . snd

src/Simplex/Messaging/Client.hs

@@ -63,11 +63,13 @@ module Simplex.Messaging.Client
     forwardSMPTransmission,
     getSMPQueueInfo,
     sendProtocolCommand,
+    sendProtocolCommands,
 
     -- * Supporting types and client configuration
     ProtocolClientError (..),
     SMPClientError,
     ProxyClientError (..),
+    Response (..),
     unexpectedResponse,
     ProtocolClientConfig (..),
     NetworkConfig (..),
@@ -80,10 +82,11 @@ module Simplex.Messaging.Client
     defaultSMPClientConfig,
     defaultNetworkConfig,
     transportClientConfig,
+    clientSocksCredentials,
     chooseTransportHost,
-    proxyUsername,
     temporaryClientError,
     smpProxyError,
+    textToHostMode,
     ServerTransmissionBatch,
     ServerTransmission (..),
     ClientCommand,
@@ -116,16 +119,20 @@ import qualified Data.Aeson.TH as J
 import qualified Data.Attoparsec.ByteString.Char8 as A
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
+import qualified Data.ByteString.Base64 as B64
 import Data.Functor (($>))
 import Data.Int (Int64)
 import Data.List (find)
 import Data.List.NonEmpty (NonEmpty (..))
 import qualified Data.List.NonEmpty as L
 import Data.Maybe (catMaybes, fromMaybe)
+import Data.Text (Text)
+import qualified Data.Text as T
 import Data.Time.Clock (UTCTime (..), diffUTCTime, getCurrentTime)
 import qualified Data.X509 as X
 import qualified Data.X509.Validation as XV
 import Network.Socket (ServiceName)
+import Network.Socks5 (SocksCredentials (..))
 import Numeric.Natural
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Encoding
@@ -136,9 +143,8 @@ import Simplex.Messaging.Server.QueueStore.QueueInfo
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
 import Simplex.Messaging.Transport
-import Simplex.Messaging.Transport.Client (SocksProxy, TransportClientConfig (..), TransportHost (..), defaultTcpConnectTimeout, runTransportClient)
+import Simplex.Messaging.Transport.Client (SocksAuth (..), SocksProxyWithAuth (..), TransportClientConfig (..), TransportHost (..), defaultSMPPort, defaultTcpConnectTimeout, runTransportClient)
 import Simplex.Messaging.Transport.KeepAlive
-import Simplex.Messaging.Transport.WebSockets (WS)
 import Simplex.Messaging.Util (bshow, diffToMicroseconds, ifM, liftEitherWith, raceAny_, threadDelay', tshow, whenM)
 import Simplex.Messaging.Version
 import System.Mem.Weak (Weak, deRefWeak)
@@ -165,7 +171,7 @@ data PClient v err msg = PClient
     timeoutErrorCount :: TVar Int,
     clientCorrId :: TVar ChaChaDRG,
     sentCommands :: TMap CorrId (Request err msg),
-    sndQ :: TBQueue (Maybe (TVar Bool), ByteString),
+    sndQ :: TBQueue (Maybe (Request err msg), ByteString),
     rcvQ :: TBQueue (NonEmpty (SignedTransmission err msg)),
     msgQ :: Maybe (TBQueue (ServerTransmissionBatch v err msg))
   }
@@ -192,6 +198,7 @@ smpClientStub g sessionId thVersion thAuth = do
               thAuth,
               blockSize = smpBlockSize,
               implySessId = thVersion >= authCmdsSMPVersion,
+              encryptBlock = Nothing,
               batch = True
             },
         sessionTs = ts,
@@ -236,6 +243,12 @@ data HostMode
     HMPublic
   deriving (Eq, Show)
 
+textToHostMode :: Text -> Either String HostMode
+textToHostMode = \case
+  "public" -> Right HMPublic
+  "onion" -> Right HMOnionViaSocks
+  s -> Left $ T.unpack $ "Invalid host_mode: " <> s
+
 data SocksMode
   = -- | always use SOCKS proxy when enabled
     SMAlways
@@ -257,7 +270,7 @@ instance StrEncoding SocksMode where
 -- | network configuration for the client
 data NetworkConfig = NetworkConfig
   { -- | use SOCKS5 proxy
-    socksProxy :: Maybe SocksProxy,
+    socksProxy :: Maybe SocksProxyWithAuth,
     -- | when to use SOCKS proxy
     socksMode :: SocksMode,
     -- | determines critera which host is chosen from the list
@@ -270,6 +283,8 @@ data NetworkConfig = NetworkConfig
     smpProxyMode :: SMPProxyMode,
     -- | Fallback to direct connection when destination SMP relay does not support SMP proxy protocol extensions
     smpProxyFallback :: SMPProxyFallback,
+    -- | use web port 443 for SMP protocol
+    smpWebPort :: Bool,
     -- | timeout for the initial client TCP/TLS connection (microseconds)
     tcpConnectTimeout :: Int,
     -- | timeout of protocol commands (microseconds)
@@ -288,7 +303,7 @@ data NetworkConfig = NetworkConfig
   }
   deriving (Eq, Show)
 
-data TransportSessionMode = TSMUser | TSMEntity
+data TransportSessionMode = TSMUser | TSMSession | TSMServer | TSMEntity
   deriving (Eq, Show)
 
 -- SMP proxy mode for sending messages
@@ -338,9 +353,10 @@ defaultNetworkConfig =
       socksMode = SMAlways,
       hostMode = HMOnionViaSocks,
       requiredHostMode = False,
-      sessionMode = TSMUser,
+      sessionMode = TSMSession,
       smpProxyMode = SPMNever,
       smpProxyFallback = SPFAllow,
+      smpWebPort = False,
       tcpConnectTimeout = defaultTcpConnectTimeout,
       tcpTimeout = 15_000_000,
       tcpTimeoutPerKb = 5_000,
@@ -351,15 +367,31 @@ defaultNetworkConfig =
       logTLSErrors = False
     }
 
-transportClientConfig :: NetworkConfig -> TransportHost -> TransportClientConfig
-transportClientConfig NetworkConfig {socksProxy, socksMode, tcpConnectTimeout, tcpKeepAlive, logTLSErrors} host =
-  TransportClientConfig {socksProxy = useSocksProxy socksMode, tcpConnectTimeout, tcpKeepAlive, logTLSErrors, clientCredentials = Nothing, alpn = Nothing}
+transportClientConfig :: NetworkConfig -> TransportHost -> Bool -> TransportClientConfig
+transportClientConfig NetworkConfig {socksProxy, socksMode, tcpConnectTimeout, tcpKeepAlive, logTLSErrors} host useSNI =
+  TransportClientConfig {socksProxy = useSocksProxy socksMode, tcpConnectTimeout, tcpKeepAlive, logTLSErrors, clientCredentials = Nothing, alpn = Nothing, useSNI}
   where
-    useSocksProxy SMAlways = socksProxy
+    socksProxy' = (\(SocksProxyWithAuth _ proxy) -> proxy) <$> socksProxy
+    useSocksProxy SMAlways = socksProxy'
     useSocksProxy SMOnion = case host of
-      THOnionHost _ -> socksProxy
+      THOnionHost _ -> socksProxy'
       _ -> Nothing
-{-# INLINE transportClientConfig #-}
+
+clientSocksCredentials :: ProtocolTypeI (ProtoType msg) => NetworkConfig -> UTCTime -> TransportSession msg -> Maybe SocksCredentials
+clientSocksCredentials NetworkConfig {socksProxy, sessionMode} proxySessTs (userId, srv, entityId_) = case socksProxy of
+  Just (SocksProxyWithAuth auth _) -> case auth of
+    SocksAuthUsername {username, password} -> Just $ SocksCredentials username password
+    SocksAuthNull -> Nothing
+    SocksIsolateByAuth -> Just $ SocksCredentials sessionUsername ""
+  Nothing -> Nothing
+  where
+    sessionUsername =
+      B64.encode $ C.sha256Hash $
+        bshow userId <> case sessionMode of
+          TSMUser -> ""
+          TSMSession -> ":" <> bshow proxySessTs
+          TSMServer -> ":" <> bshow proxySessTs <> "@" <> strEncode srv
+          TSMEntity -> ":" <> bshow proxySessTs <> "@" <> strEncode srv <> maybe "" ("/" <>) entityId_
 
 -- | protocol client configuration.
 data ProtocolClientConfig v = ProtocolClientConfig
@@ -373,24 +405,34 @@ data ProtocolClientConfig v = ProtocolClientConfig
     -- | client-server protocol version range
     serverVRange :: VersionRange v,
     -- | agree shared session secret (used in SMP proxy for additional encryption layer)
-    agreeSecret :: Bool
+    agreeSecret :: Bool,
+    -- | Whether connecting client is a proxy server. See comment in ClientHandshake
+    proxyServer :: Bool,
+    -- | send SNI to server, False for SMP
+    useSNI :: Bool
   }
 
 -- | Default protocol client configuration.
-defaultClientConfig :: Maybe [ALPN] -> VersionRange v -> ProtocolClientConfig v
-defaultClientConfig clientALPN serverVRange =
+defaultClientConfig :: Maybe [ALPN] -> Bool -> VersionRange v -> ProtocolClientConfig v
+defaultClientConfig clientALPN useSNI serverVRange =
   ProtocolClientConfig
     { qSize = 64,
       defaultTransport = ("443", transport @TLS),
       networkConfig = defaultNetworkConfig,
       clientALPN,
       serverVRange,
-      agreeSecret = False
+      agreeSecret = False,
+      proxyServer = False,
+      useSNI
     }
 {-# INLINE defaultClientConfig #-}
 
 defaultSMPClientConfig :: ProtocolClientConfig SMPVersion
-defaultSMPClientConfig = defaultClientConfig (Just supportedSMPHandshakes) supportedClientSMPRelayVRange
+defaultSMPClientConfig =
+  (defaultClientConfig (Just supportedSMPHandshakes) False supportedClientSMPRelayVRange)
+    { defaultTransport = (show defaultSMPPort, transport @TLS),
+      agreeSecret = True
+    }
 {-# INLINE defaultSMPClientConfig #-}
 
 data Request err msg = Request
@@ -441,22 +483,23 @@ transportSession' = transportSession . client_
 type UserId = Int64
 
 -- | Transport session key - includes entity ID if `sessionMode = TSMEntity`.
-type TransportSession msg = (UserId, ProtoServer msg, Maybe EntityId)
+-- Please note that for SMP connection ID is used as entity ID, not queue ID.
+type TransportSession msg = (UserId, ProtoServer msg, Maybe ByteString)
 
 -- | Connects to 'ProtocolServer' using passed client configuration
 -- and queue for messages and notifications.
 --
 -- A single queue can be used for multiple 'SMPClient' instances,
 -- as 'SMPServerTransmission' includes server information.
-getProtocolClient :: forall v err msg. Protocol v err msg => TVar ChaChaDRG -> TransportSession msg -> ProtocolClientConfig v -> Maybe (TBQueue (ServerTransmissionBatch v err msg)) -> (ProtocolClient v err msg -> IO ()) -> IO (Either (ProtocolClientError err) (ProtocolClient v err msg))
-getProtocolClient g transportSession@(_, srv, _) cfg@ProtocolClientConfig {qSize, networkConfig, clientALPN, serverVRange, agreeSecret} msgQ disconnected = do
+getProtocolClient :: forall v err msg. Protocol v err msg => TVar ChaChaDRG -> TransportSession msg -> ProtocolClientConfig v -> Maybe (TBQueue (ServerTransmissionBatch v err msg)) -> UTCTime -> (ProtocolClient v err msg -> IO ()) -> IO (Either (ProtocolClientError err) (ProtocolClient v err msg))
+getProtocolClient g transportSession@(_, srv, _) cfg@ProtocolClientConfig {qSize, networkConfig, clientALPN, serverVRange, agreeSecret, proxyServer, useSNI} msgQ proxySessTs disconnected = do
   case chooseTransportHost networkConfig (host srv) of
     Right useHost ->
       (getCurrentTime >>= mkProtocolClient useHost >>= runClient useTransport useHost)
         `catch` \(e :: IOException) -> pure . Left $ PCEIOError e
     Left e -> pure $ Left e
   where
-    NetworkConfig {tcpConnectTimeout, tcpTimeout, smpPingInterval} = networkConfig
+    NetworkConfig {smpWebPort, tcpConnectTimeout, tcpTimeout, smpPingInterval} = networkConfig
     mkProtocolClient :: TransportHost -> UTCTime -> IO (PClient v err msg)
     mkProtocolClient transportHost ts = do
       connected <- newTVarIO False
@@ -487,10 +530,10 @@ getProtocolClient g transportSession@(_, srv, _) cfg@ProtocolClientConfig {qSize
     runClient :: (ServiceName, ATransport) -> TransportHost -> PClient v err msg -> IO (Either (ProtocolClientError err) (ProtocolClient v err msg))
     runClient (port', ATransport t) useHost c = do
       cVar <- newEmptyTMVarIO
-      let tcConfig = (transportClientConfig networkConfig useHost) {alpn = clientALPN}
-          username = proxyUsername transportSession
+      let tcConfig = (transportClientConfig networkConfig useHost useSNI) {alpn = clientALPN}
+          socksCreds = clientSocksCredentials networkConfig proxySessTs transportSession
       tId <-
-        runTransportClient tcConfig (Just username) useHost port' (Just $ keyHash srv) (client t c cVar)
+        runTransportClient tcConfig socksCreds useHost port' (Just $ keyHash srv) (client t c cVar)
           `forkFinally` \_ -> void (atomically . tryPutTMVar cVar $ Left PCENetworkError)
       c_ <- tcpConnectTimeout `timeout` atomically (takeTMVar cVar)
       case c_ of
@@ -500,14 +543,15 @@ getProtocolClient g transportSession@(_, srv, _) cfg@ProtocolClientConfig {qSize
 
     useTransport :: (ServiceName, ATransport)
     useTransport = case port srv of
-      "" -> defaultTransport cfg
-      "80" -> ("80", transport @WS)
+      "" -> case protocolTypeI @(ProtoType msg) of
+        SPSMP | smpWebPort -> ("443", transport @TLS)
+        _ -> defaultTransport cfg
       p -> (p, transport @TLS)
 
     client :: forall c. Transport c => TProxy c -> PClient v err msg -> TMVar (Either (ProtocolClientError err) (ProtocolClient v err msg)) -> c -> IO ()
     client _ c cVar h = do
       ks <- if agreeSecret then Just <$> atomically (C.generateKeyPair g) else pure Nothing
-      runExceptT (protocolClientHandshake @v @err @msg h ks (keyHash srv) serverVRange) >>= \case
+      runExceptT (protocolClientHandshake @v @err @msg h ks (keyHash srv) serverVRange proxyServer) >>= \case
         Left e -> atomically . putTMVar cVar . Left $ PCETransportError e
         Right th@THandle {params} -> do
           sessionTs <- getCurrentTime
@@ -522,9 +566,12 @@ getProtocolClient g transportSession@(_, srv, _) cfg@ProtocolClientConfig {qSize
     send :: Transport c => ProtocolClient v err msg -> THandle v c 'TClient -> IO ()
     send ProtocolClient {client_ = PClient {sndQ}} h = forever $ atomically (readTBQueue sndQ) >>= sendPending
       where
-        sendPending (Nothing, s) = send_ s
-        sendPending (Just pending, s) = whenM (readTVarIO pending) $ send_ s
-        send_ = void . tPutLog h
+        sendPending (r, s) = case r of
+          Nothing -> void $ tPutLog h s
+          Just Request {pending, responseVar} ->
+            whenM (readTVarIO pending) $ tPutLog h s >>= either responseErr pure
+            where
+              responseErr = atomically . putTMVar responseVar . Left . PCETransportError
 
     receive :: Transport c => ProtocolClient v err msg -> THandle v c 'TClient -> IO ()
     receive ProtocolClient {client_ = PClient {rcvQ, lastReceived, timeoutErrorCount}} h = forever $ do
@@ -544,7 +591,7 @@ getProtocolClient g transportSession@(_, srv, _) cfg@ProtocolClientConfig {qSize
           if remaining > 1_000_000 -- delay pings only for significant time
             then loop remaining
             else do
-              whenM (readTVarIO sendPings) $ void . runExceptT $ sendProtocolCommand c Nothing "" (protocolPing @v @err @msg)
+              whenM (readTVarIO sendPings) $ void . runExceptT $ sendProtocolCommand c Nothing NoEntity (protocolPing @v @err @msg)
               -- sendProtocolCommand/getResponse updates counter for each command
               cnt <- readTVarIO timeoutErrorCount
               -- drop client when maxCnt of commands have timed out in sequence, but only after some time has passed after last received response
@@ -596,10 +643,6 @@ getProtocolClient g transportSession@(_, srv, _) cfg@ProtocolClientConfig {qSize
 unexpectedResponse :: Show r => r -> ProtocolClientError err
 unexpectedResponse = PCEUnexpectedResponse . B.pack . take 32 . show
 
-proxyUsername :: TransportSession msg -> ByteString
-proxyUsername (userId, _, entityId_) = C.sha256Hash $ bshow userId <> maybe "" (":" <>) entityId_
-{-# INLINE proxyUsername #-}
-
 -- | Disconnects client from the server and terminates client threads.
 closeProtocolClient :: ProtocolClient v err msg -> IO ()
 closeProtocolClient = mapM_ (deRefWeak >=> mapM_ killThread) . action
@@ -670,7 +713,7 @@ createSMPQueue ::
   Bool ->
   ExceptT SMPClientError IO QueueIdsKeys
 createSMPQueue c (rKey, rpKey) dhKey auth subMode sndSecure =
-  sendSMPCommand c (Just rpKey) "" (NEW rKey dhKey auth subMode sndSecure) >>= \case
+  sendSMPCommand c (Just rpKey) NoEntity (NEW rKey dhKey auth subMode sndSecure) >>= \case
     IDS qik -> pure qik
     r -> throwE $ unexpectedResponse r
 
@@ -678,8 +721,8 @@ createSMPQueue c (rKey, rpKey) dhKey auth subMode sndSecure =
 --
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#subscribe-to-queue
 subscribeSMPQueue :: SMPClient -> RcvPrivateAuthKey -> RecipientId -> ExceptT SMPClientError IO ()
-subscribeSMPQueue c@ProtocolClient {client_ = PClient {sendPings}} rpKey rId = do
-  liftIO . atomically $ writeTVar sendPings True
+subscribeSMPQueue c rpKey rId = do
+  liftIO $ enablePings c
   sendSMPCommand c (Just rpKey) rId SUB >>= \case
     OK -> pure ()
     cmd@MSG {} -> liftIO $ writeSMPMessage c rId cmd
@@ -687,8 +730,8 @@ subscribeSMPQueue c@ProtocolClient {client_ = PClient {sendPings}} rpKey rId = d
 
 -- | Subscribe to multiple SMP queues batching commands if supported.
 subscribeSMPQueues :: SMPClient -> NonEmpty (RcvPrivateAuthKey, RecipientId) -> IO (NonEmpty (Either SMPClientError ()))
-subscribeSMPQueues c@ProtocolClient {client_ = PClient {sendPings}} qs = do
-  atomically $ writeTVar sendPings True
+subscribeSMPQueues c qs = do
+  liftIO $ enablePings c
   sendProtocolCommands c cs >>= mapM (processSUBResponse c)
   where
     cs = L.map (\(rpKey, rId) -> (Just rpKey, rId, Cmd SRecipient SUB)) qs
@@ -727,14 +770,22 @@ getSMPMessage c rpKey rId =
 --
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#subscribe-to-queue-notifications
 subscribeSMPQueueNotifications :: SMPClient -> NtfPrivateAuthKey -> NotifierId -> ExceptT SMPClientError IO ()
-subscribeSMPQueueNotifications = okSMPCommand NSUB
+subscribeSMPQueueNotifications c npKey nId = do
+  liftIO $ enablePings c
+  okSMPCommand NSUB c npKey nId
 {-# INLINE subscribeSMPQueueNotifications #-}
 
 -- | Subscribe to multiple SMP queues notifications batching commands if supported.
 subscribeSMPQueuesNtfs :: SMPClient -> NonEmpty (NtfPrivateAuthKey, NotifierId) -> IO (NonEmpty (Either SMPClientError ()))
-subscribeSMPQueuesNtfs = okSMPCommands NSUB
+subscribeSMPQueuesNtfs c qs = do
+  liftIO $ enablePings c
+  okSMPCommands NSUB c qs
 {-# INLINE subscribeSMPQueuesNtfs #-}
 
+enablePings :: SMPClient -> IO ()
+enablePings ProtocolClient {client_ = PClient {sendPings}} = atomically $ writeTVar sendPings True
+{-# INLINE enablePings #-}
+
 -- | Secure the SMP queue by adding a sender public key.
 --
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#secure-queue-command
@@ -829,7 +880,7 @@ deleteSMPQueues = okSMPCommands DEL
 connectSMPProxiedRelay :: SMPClient -> SMPServer -> Maybe BasicAuth -> ExceptT SMPClientError IO ProxiedRelay
 connectSMPProxiedRelay c@ProtocolClient {client_ = PClient {tcpConnectTimeout, tcpTimeout}} relayServ@ProtocolServer {keyHash = C.KeyHash kh} proxyAuth
   | thVersion (thParams c) >= sendingProxySMPVersion =
-      sendProtocolCommand_ c Nothing tOut Nothing "" (Cmd SProxiedClient (PRXY relayServ proxyAuth)) >>= \case
+      sendProtocolCommand_ c Nothing tOut Nothing NoEntity (Cmd SProxiedClient (PRXY relayServ proxyAuth)) >>= \case
         PKEY sId vr (chain, key) ->
           case supportedClientSMPRelayVRange `compatibleVersion` vr of
             Nothing -> throwE $ transportErr TEVersion
@@ -931,7 +982,7 @@ proxySMPCommand c@ProtocolClient {thParams = proxyThParams, client_ = PClient {c
   et <- liftEitherWith PCECryptoError $ EncTransmission <$> C.cbEncrypt cmdSecret nonce b paddedProxiedTLength
   -- proxy interaction errors are wrapped
   let tOut = Just $ 2 * tcpTimeout
-  tryE (sendProtocolCommand_ c (Just nonce) tOut Nothing sessionId (Cmd SProxiedClient (PFWD v cmdPubKey et))) >>= \case
+  tryE (sendProtocolCommand_ c (Just nonce) tOut Nothing (EntityId sessionId) (Cmd SProxiedClient (PFWD v cmdPubKey et))) >>= \case
     Right r -> case r of
       PRES (EncResponse er) -> do
         -- server interaction errors are thrown directly
@@ -967,7 +1018,7 @@ forwardSMPTransmission c@ProtocolClient {thParams, client_ = PClient {clientCorr
   let fwdT = FwdTransmission {fwdCorrId, fwdVersion, fwdKey, fwdTransmission}
       eft = EncFwdTransmission $ C.cbEncryptNoPad sessSecret nonce (smpEncode fwdT)
   -- send
-  sendProtocolCommand_ c (Just nonce) Nothing Nothing "" (Cmd SSender (RFWD eft)) >>= \case
+  sendProtocolCommand_ c (Just nonce) Nothing Nothing NoEntity (Cmd SSender (RFWD eft)) >>= \case
     RRES (EncFwdResponse efr) -> do
       -- unwrap
       r' <- liftEitherWith PCECryptoError $ C.cbDecryptNoPad sessSecret (C.reverseNonce nonce) efr
@@ -1015,7 +1066,7 @@ sendProtocolCommands c@ProtocolClient {thParams = THandleParams {batch, blockSiz
       | diff == 0 = pure $ L.fromList rs
       | diff > 0 = do
           putStrLn "send error: fewer responses than expected"
-          pure $ L.fromList $ rs <> replicate diff (Response "" $ Left $ PCETransportError TEBadBlock)
+          pure $ L.fromList $ rs <> replicate diff (Response NoEntity $ Left $ PCETransportError TEBadBlock)
       | otherwise = do
           putStrLn "send error: more responses than expected"
           pure $ L.fromList $ take (L.length cs) rs
@@ -1056,12 +1107,12 @@ sendProtocolCommand_ c@ProtocolClient {client_ = PClient {sndQ}, thParams = THan
   where
     -- two separate "atomically" needed to avoid blocking
     sendRecv :: Either TransportError SentRawTransmission -> Request err msg -> IO (Either (ProtocolClientError err) msg)
-    sendRecv t_ r@Request {pending} = case t_ of
+    sendRecv t_ r = case t_ of
       Left e -> pure . Left $ PCETransportError e
       Right t
         | B.length s > blockSize - 2 -> pure . Left $ PCETransportError TELargeMsg
         | otherwise -> do
-            atomically $ writeTBQueue sndQ (Just pending, s)
+            atomically $ writeTBQueue sndQ (Just r, s)
             response <$> getResponse c tOut r
         where
           s

src/Simplex/Messaging/Client/Agent.hs

@@ -76,7 +76,7 @@ data SMPClientAgentConfig = SMPClientAgentConfig
 defaultSMPClientAgentConfig :: SMPClientAgentConfig
 defaultSMPClientAgentConfig =
   SMPClientAgentConfig
-    { smpCfg = defaultSMPClientConfig {defaultTransport = ("5223", transport @TLS)},
+    { smpCfg = defaultSMPClientConfig,
       reconnectInterval =
         RetryInterval
           { initialInterval = second,
@@ -84,8 +84,8 @@ defaultSMPClientAgentConfig =
             maxInterval = 10 * second
           },
       persistErrorInterval = 30, -- seconds
-      msgQSize = 1024,
-      agentQSize = 1024,
+      msgQSize = 2048,
+      agentQSize = 2048,
       agentSubsBatchSize = 1360,
       ownServerDomains = []
     }
@@ -95,6 +95,7 @@ defaultSMPClientAgentConfig =
 data SMPClientAgent = SMPClientAgent
   { agentCfg :: SMPClientAgentConfig,
     active :: TVar Bool,
+    startedAt :: UTCTime,
     msgQ :: TBQueue (ServerTransmissionBatch SMPVersion ErrorType BrokerMsg),
     agentQ :: TBQueue SMPClientAgentEvent,
     randomDrg :: TVar ChaChaDRG,
@@ -111,6 +112,7 @@ type OwnServer = Bool
 newSMPClientAgent :: SMPClientAgentConfig -> TVar ChaChaDRG -> IO SMPClientAgent
 newSMPClientAgent agentCfg@SMPClientAgentConfig {msgQSize, agentQSize} randomDrg = do
   active <- newTVarIO True
+  startedAt <- getCurrentTime
   msgQ <- newTBQueueIO msgQSize
   agentQ <- newTBQueueIO agentQSize
   smpClients <- TM.emptyIO
@@ -123,6 +125,7 @@ newSMPClientAgent agentCfg@SMPClientAgentConfig {msgQSize, agentQSize} randomDrg
     SMPClientAgent
       { agentCfg,
         active,
+        startedAt,
         msgQ,
         agentQ,
         randomDrg,
@@ -194,8 +197,8 @@ isOwnServer SMPClientAgent {agentCfg} ProtocolServer {host} =
 
 -- | Run an SMP client for SMPClientVar
 connectClient :: SMPClientAgent -> SMPServer -> SMPClientVar -> IO (Either SMPClientError SMPClient)
-connectClient ca@SMPClientAgent {agentCfg, smpClients, smpSessions, msgQ, randomDrg} srv v =
-  getProtocolClient randomDrg (1, srv, Nothing) (smpCfg agentCfg) (Just msgQ) clientDisconnected
+connectClient ca@SMPClientAgent {agentCfg, smpClients, smpSessions, msgQ, randomDrg, startedAt} srv v =
+  getProtocolClient randomDrg (1, srv, Nothing) (smpCfg agentCfg) (Just msgQ) startedAt clientDisconnected
   where
     clientDisconnected :: SMPClient -> IO ()
     clientDisconnected smp = do

src/Simplex/Messaging/Crypto.hs

@@ -1,11 +1,14 @@
 {-# LANGUAGE AllowAmbiguousTypes #-}
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE ConstraintKinds #-}
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE DeriveAnyClass #-}
+{-# LANGUAGE DerivingStrategies #-}
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE GADTs #-}
+{-# LANGUAGE GeneralizedNewtypeDeriving #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE NamedFieldPuns #-}
@@ -152,6 +155,12 @@ module Simplex.Messaging.Crypto
     unsafeSbKey,
     randomSbKey,
 
+    -- * secret_box chains
+    SbChainKey,
+    SbKeyNonce,
+    sbcInit,
+    sbcHkdf,
+
     -- * pseudo-random bytes
     randomBytes,
 
@@ -198,6 +207,7 @@ import qualified Crypto.Cipher.Types as AES
 import qualified Crypto.Cipher.XSalsa as XSalsa
 import qualified Crypto.Error as CE
 import Crypto.Hash (Digest, SHA256 (..), SHA512 (..), hash, hashDigestSize)
+import qualified Crypto.KDF.HKDF as H
 import qualified Crypto.MAC.Poly1305 as Poly1305
 import qualified Crypto.PubKey.Curve25519 as X25519
 import qualified Crypto.PubKey.Curve448 as X448
@@ -226,10 +236,9 @@ import Data.Typeable (Proxy (Proxy), Typeable)
 import Data.Word (Word32)
 import Data.X509
 import Data.X509.Validation (Fingerprint (..), getFingerprint)
-import Database.SQLite.Simple.FromField (FromField (..))
-import Database.SQLite.Simple.ToField (ToField (..))
 import GHC.TypeLits (ErrorMessage (..), KnownNat, Nat, TypeError, natVal, type (+))
 import Network.Transport.Internal (decodeWord16, encodeWord16)
+import Simplex.Messaging.Agent.Store.DB (Binary (..), FromField (..), ToField (..))
 import Simplex.Messaging.Encoding
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Parsers (blobFieldDecoder, parseAll, parseString)
@@ -714,23 +723,23 @@ generateKeyPair_ = case sAlgorithm @a of
       let k = X448.toPublic pk
        in pure (PublicKeyX448 k, PrivateKeyX448 pk k)
 
-instance ToField APrivateSignKey where toField = toField . encodePrivKey
+instance ToField APrivateSignKey where toField = toField . Binary . encodePrivKey
 
-instance ToField APublicVerifyKey where toField = toField . encodePubKey
+instance ToField APublicVerifyKey where toField = toField . Binary . encodePubKey
 
-instance ToField APrivateAuthKey where toField = toField . encodePrivKey
+instance ToField APrivateAuthKey where toField = toField . Binary . encodePrivKey
 
-instance ToField APublicAuthKey where toField = toField . encodePubKey
+instance ToField APublicAuthKey where toField = toField . Binary . encodePubKey
 
-instance ToField APrivateDhKey where toField = toField . encodePrivKey
+instance ToField APrivateDhKey where toField = toField . Binary . encodePrivKey
 
-instance ToField APublicDhKey where toField = toField . encodePubKey
+instance ToField APublicDhKey where toField = toField . Binary . encodePubKey
 
-instance AlgorithmI a => ToField (PrivateKey a) where toField = toField . encodePrivKey
+instance AlgorithmI a => ToField (PrivateKey a) where toField = toField . Binary . encodePrivKey
 
-instance AlgorithmI a => ToField (PublicKey a) where toField = toField . encodePubKey
+instance AlgorithmI a => ToField (PublicKey a) where toField = toField . Binary . encodePubKey
 
-instance ToField (DhSecret a) where toField = toField . dhBytes'
+instance ToField (DhSecret a) where toField = toField . Binary . dhBytes'
 
 instance FromField APrivateSignKey where fromField = blobFieldDecoder decodePrivKey
 
@@ -881,10 +890,9 @@ validSignatureSize n =
 -- | AES key newtype.
 newtype Key = Key {unKey :: ByteString}
   deriving (Eq, Ord, Show)
+  deriving newtype (FromField)
 
-instance ToField Key where toField = toField . unKey
-
-instance FromField Key where fromField f = Key <$> fromField f
+instance ToField Key where toField (Key s) = toField $ Binary s
 
 instance ToJSON Key where
   toJSON = strToJSON . unKey
@@ -945,7 +953,7 @@ instance FromJSON KeyHash where
 instance IsString KeyHash where
   fromString = parseString $ parseAll strP
 
-instance ToField KeyHash where toField = toField . strEncode
+instance ToField KeyHash where toField = toField . Binary . strEncode
 
 instance FromField KeyHash where fromField = blobFieldDecoder $ parseAll strP
 
@@ -1155,10 +1163,14 @@ instance SignatureAlgorithmX509 pk => SignatureAlgorithmX509 (a, pk) where
 newtype SignedObject a = SignedObject {getSignedExact :: SignedExact a}
 
 instance (Typeable a, Eq a, Show a, ASN1Object a) => FromField (SignedObject a) where
+#if defined(dbPostgres)
+  fromField f dat = SignedObject <$> blobFieldDecoder decodeSignedObject f dat
+#else
   fromField = fmap SignedObject . blobFieldDecoder decodeSignedObject
+#endif
 
 instance (Eq a, Show a, ASN1Object a) => ToField (SignedObject a) where
-  toField (SignedObject s) = toField $ encodeSignedObject s
+  toField (SignedObject s) = toField . Binary $ encodeSignedObject s
 
 instance (Eq a, Show a, ASN1Object a) => Encoding (SignedObject a) where
   smpEncode (SignedObject exact) = smpEncode . Large $ encodeSignedObject exact
@@ -1258,6 +1270,9 @@ cbVerify k pk nonce (CbAuthenticator s) authorized = cbDecryptNoPad (dh' k pk) n
 
 newtype CbNonce = CryptoBoxNonce {unCbNonce :: ByteString}
   deriving (Eq, Show)
+  deriving newtype (FromField)
+
+instance ToField CbNonce where toField (CryptoBoxNonce s) = toField $ Binary s
 
 pattern CbNonce :: ByteString -> CbNonce
 pattern CbNonce s <- CryptoBoxNonce s
@@ -1275,10 +1290,6 @@ instance ToJSON CbNonce where
 instance FromJSON CbNonce where
   parseJSON = strParseJSON "CbNonce"
 
-instance FromField CbNonce where fromField f = CryptoBoxNonce <$> fromField f
-
-instance ToField CbNonce where toField (CryptoBoxNonce s) = toField s
-
 cbNonce :: ByteString -> CbNonce
 cbNonce s
   | len == 24 = CryptoBoxNonce s
@@ -1302,6 +1313,9 @@ instance Encoding CbNonce where
 
 newtype SbKey = SecretBoxKey {unSbKey :: ByteString}
   deriving (Eq, Show)
+  deriving newtype (FromField)
+
+instance ToField SbKey where toField (SecretBoxKey s) = toField $ Binary s
 
 pattern SbKey :: ByteString -> SbKey
 pattern SbKey s <- SecretBoxKey s
@@ -1319,10 +1333,6 @@ instance ToJSON SbKey where
 instance FromJSON SbKey where
   parseJSON = strParseJSON "SbKey"
 
-instance FromField SbKey where fromField f = SecretBoxKey <$> fromField f
-
-instance ToField SbKey where toField (SecretBoxKey s) = toField s
-
 sbKey :: ByteString -> Either String SbKey
 sbKey s
   | B.length s == 32 = Right $ SecretBoxKey s
@@ -1334,6 +1344,26 @@ unsafeSbKey s = either error id $ sbKey s
 randomSbKey :: TVar ChaChaDRG -> STM SbKey
 randomSbKey gVar = SecretBoxKey <$> randomBytes 32 gVar
 
+newtype SbChainKey = SecretBoxChainKey {unSbChainKey :: ByteString}
+  deriving (Eq, Show)
+
+sbcInit :: ByteArrayAccess secret => ByteString -> secret -> (SbChainKey, SbChainKey)
+sbcInit salt secret = (SecretBoxChainKey ck1, SecretBoxChainKey ck2)
+  where
+    prk = H.extract salt secret :: H.PRK SHA512
+    out = H.expand prk ("SimpleXSbChainInit" :: ByteString) 64
+    (ck1, ck2) = B.splitAt 32 out
+
+type SbKeyNonce = (SbKey, CbNonce)
+
+sbcHkdf :: SbChainKey -> (SbKeyNonce, SbChainKey)
+sbcHkdf (SecretBoxChainKey ck) = ((SecretBoxKey sk, CryptoBoxNonce nonce), SecretBoxChainKey ck')
+  where
+    prk = H.extract B.empty ck :: H.PRK SHA512
+    out = H.expand prk ("SimpleXSbChain" :: ByteString) 88 -- = 32 (new chain key) + 32 (secret_box key) + 24 (nonce)
+    (ck', rest) = B.splitAt 32 out
+    (sk, nonce) = B.splitAt 32 rest
+
 xSalsa20 :: ByteArrayAccess key => key -> ByteString -> ByteString -> (ByteString, ByteString)
 xSalsa20 secret nonce msg = (rs, msg')
   where

src/Simplex/Messaging/Crypto/Lazy.hs

@@ -17,6 +17,8 @@ module Simplex.Messaging.Crypto.Lazy
     kcbEncryptTailTag,
     sbDecryptTailTag,
     kcbDecryptTailTag,
+    sbEncryptTailTagNoPad,
+    sbDecryptTailTagNoPad,
     fastReplicate,
     secretBox,
     secretBoxTailTag,
@@ -49,7 +51,7 @@ import Data.Composition ((.:.))
 import Data.Int (Int64)
 import Data.List.NonEmpty (NonEmpty (..))
 import Foreign (sizeOf)
-import Simplex.Messaging.Crypto (CbNonce, CryptoError (..), DhSecret (..), DhSecretX25519, SbKey, pattern CbNonce, pattern SbKey)
+import Simplex.Messaging.Crypto (CbNonce, CryptoError (..), DhSecret (..), DhSecretX25519, SbKey, SbKeyNonce, pattern CbNonce, pattern SbKey)
 import Simplex.Messaging.Crypto.SNTRUP761 (KEMHybridSecret (..))
 import Simplex.Messaging.Encoding
 
@@ -142,6 +144,10 @@ sbEncryptTailTag_ :: ByteArrayAccess key => key -> CbNonce -> LazyByteString ->
 sbEncryptTailTag_ key (CbNonce nonce) msg len paddedLen =
   LB.fromChunks <$> (secretBoxTailTag sbEncryptChunk key nonce =<< pad msg len paddedLen)
 
+sbEncryptTailTagNoPad :: SbKeyNonce -> LazyByteString -> Either CryptoError LazyByteString
+sbEncryptTailTagNoPad (SbKey key, CbNonce nonce) msg =
+  LB.fromChunks <$> secretBoxTailTag sbEncryptChunk key nonce msg
+
 -- | NaCl @secret_box@ decrypt with a symmetric 256-bit key and 192-bit nonce with appended auth tag (more efficient with large files).
 -- paddedLen should NOT include the tag length, it should be the same number that is passed to sbEncrypt / sbEncryptTailTag.
 sbDecryptTailTag :: SbKey -> CbNonce -> Int64 -> LazyByteString -> Either CryptoError (Bool, LazyByteString)
@@ -165,6 +171,15 @@ sbDecryptTailTag_ key (CbNonce nonce) paddedLen packet =
   where
     (c, tag') = LB.splitAt paddedLen packet
 
+sbDecryptTailTagNoPad :: SbKeyNonce -> Int64 -> LazyByteString -> Either CryptoError (Bool, LazyByteString)
+sbDecryptTailTagNoPad (SbKey key, CbNonce nonce) paddedLen packet =
+  result <$> secretBox sbDecryptChunk key nonce c
+  where
+    result (tag :| cs) =
+      let valid = LB.length tag' == 16 && BA.constEq (LB.toStrict tag') tag
+       in (valid, LB.fromChunks cs)
+    (c, tag') = LB.splitAt paddedLen packet
+
 secretBoxTailTag :: ByteArrayAccess key => (SbState -> ByteString -> (ByteString, SbState)) -> key -> ByteString -> LazyByteString -> Either CryptoError [ByteString]
 secretBoxTailTag sbProcess secret nonce msg = run <$> sbInit_ secret nonce
   where

src/Simplex/Messaging/Crypto/Ratchet.hs

@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE DeriveAnyClass #-}
 {-# LANGUAGE DuplicateRecordFields #-}
@@ -109,9 +110,8 @@ import Data.Maybe (fromMaybe, isJust)
 import Data.Type.Equality
 import Data.Typeable (Typeable)
 import Data.Word (Word16, Word32)
-import Database.SQLite.Simple.FromField (FromField (..))
-import Database.SQLite.Simple.ToField (ToField (..))
 import Simplex.Messaging.Agent.QueryString
+import Simplex.Messaging.Agent.Store.DB (Binary (..), BoolInt (..), FromField (..), ToField (..))
 import Simplex.Messaging.Crypto
 import Simplex.Messaging.Crypto.SNTRUP761.Bindings
 import Simplex.Messaging.Encoding
@@ -206,6 +206,10 @@ instance Encoding ARKEMParams where
       'A' -> ARKP SRKSAccepted .: RKParamsAccepted <$> smpP <*> smpP
       _ -> fail "bad ratchet KEM params"
 
+instance ToField ARKEMParams where toField = toField . Binary . smpEncode
+
+instance FromField ARKEMParams where fromField = blobFieldDecoder smpDecode
+
 data E2ERatchetParams (s :: RatchetKEMState) (a :: Algorithm)
   = E2ERatchetParams VersionE2E (PublicKey a) (PublicKey a) (Maybe (RKEMParams s))
   deriving (Show)
@@ -359,7 +363,7 @@ instance Encoding APrivRKEMParams where
       'A' -> APRKP SRKSAccepted .:. PrivateRKParamsAccepted <$> smpP <*> smpP <*> smpP
       _ -> fail "bad APrivRKEMParams"
 
-instance RatchetKEMStateI s => ToField (PrivRKEMParams s) where toField = toField . smpEncode
+instance RatchetKEMStateI s => ToField (PrivRKEMParams s) where toField = toField . Binary . smpEncode
 
 instance (Typeable s, RatchetKEMStateI s) => FromField (PrivRKEMParams s) where fromField = blobFieldDecoder smpDecode
 
@@ -576,7 +580,7 @@ instance ToJSON RatchetKey where
 instance FromJSON RatchetKey where
   parseJSON = fmap RatchetKey . strParseJSON "Key"
 
-instance ToField MessageKey where toField = toField . smpEncode
+instance ToField MessageKey where toField = toField . Binary . smpEncode
 
 instance FromField MessageKey where fromField = blobFieldDecoder smpDecode
 
@@ -1120,14 +1124,24 @@ instance AlgorithmI a => ToJSON (Ratchet a) where
 instance AlgorithmI a => FromJSON (Ratchet a) where
   parseJSON = $(JQ.mkParseJSON defaultJSON ''Ratchet)
 
-instance AlgorithmI a => ToField (Ratchet a) where toField = toField . LB.toStrict . J.encode
+instance AlgorithmI a => ToField (Ratchet a) where toField = toField . Binary . LB.toStrict . J.encode
 
 instance (AlgorithmI a, Typeable a) => FromField (Ratchet a) where fromField = blobFieldDecoder J.eitherDecodeStrict'
 
-instance ToField PQEncryption where toField (PQEncryption pqEnc) = toField pqEnc
+instance ToField PQEncryption where toField (PQEncryption pqEnc) = toField (BI pqEnc)
 
-instance FromField PQEncryption where fromField f = PQEncryption <$> fromField f
+instance FromField PQEncryption where 
+#if defined(dbPostgres)
+  fromField f dat = PQEncryption . unBI <$> fromField f dat
+#else
+  fromField f = PQEncryption . unBI <$> fromField f
+#endif
 
-instance ToField PQSupport where toField (PQSupport pqEnc) = toField pqEnc
+instance ToField PQSupport where toField (PQSupport pqEnc) = toField (BI pqEnc)
 
-instance FromField PQSupport where fromField f = PQSupport <$> fromField f
+instance FromField PQSupport where
+#if defined(dbPostgres)
+  fromField f dat = PQSupport . unBI <$> fromField f dat
+#else
+  fromField f = PQSupport . unBI <$> fromField f
+#endif

src/Simplex/Messaging/Crypto/SNTRUP761.hs

@@ -4,7 +4,7 @@
 
 module Simplex.Messaging.Crypto.SNTRUP761 where
 
-import Crypto.Hash (Digest, SHA256, hash)
+import Crypto.Hash (Digest, SHA3_256, hash)
 import Data.ByteArray (ScrubbedBytes)
 import qualified Data.ByteArray as BA
 import Data.ByteString (ByteString)
@@ -28,4 +28,4 @@ kcbEncrypt (KEMHybridSecret k) = sbEncrypt_ k
 kemHybridSecret :: PublicKeyX25519 -> PrivateKeyX25519 -> KEMSharedKey -> KEMHybridSecret
 kemHybridSecret k pk (KEMSharedKey kem) =
   let DhSecretX25519 dh = C.dh' k pk
-   in KEMHybridSecret $ BA.convert (hash $ BA.convert dh <> kem :: Digest SHA256)
+   in KEMHybridSecret $ BA.convert (hash $ BA.convert dh <> kem :: Digest SHA3_256)

src/Simplex/Messaging/Crypto/SNTRUP761/Bindings.hs

@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE TypeApplications #-}
 
 module Simplex.Messaging.Crypto.SNTRUP761.Bindings where
@@ -9,9 +10,8 @@ import Data.Bifunctor (bimap)
 import Data.ByteArray (ScrubbedBytes)
 import qualified Data.ByteArray as BA
 import Data.ByteString (ByteString)
-import Database.SQLite.Simple.FromField
-import Database.SQLite.Simple.ToField
 import Foreign (nullPtr)
+import Simplex.Messaging.Agent.Store.DB (FromField (..), ToField (..))
 import Simplex.Messaging.Crypto.SNTRUP761.Bindings.Defines
 import Simplex.Messaging.Crypto.SNTRUP761.Bindings.FFI
 import Simplex.Messaging.Crypto.SNTRUP761.Bindings.RNG (withDRG)
@@ -121,7 +121,11 @@ instance ToField KEMSharedKey where
   toField (KEMSharedKey k) = toField (BA.convert k :: ByteString)
 
 instance FromField KEMSharedKey where
+#if defined(dbPostgres)
+  fromField f dat = KEMSharedKey . BA.convert @ByteString <$> fromField f dat
+#else
   fromField f = KEMSharedKey . BA.convert @ByteString <$> fromField f
+#endif
 
 instance ToJSON KEMSharedKey where
   toJSON = strToJSON

src/Simplex/Messaging/Encoding.hs

@@ -42,10 +42,12 @@ class Encoding a where
   -- | decoding of type (default implementation uses parser)
   smpDecode :: ByteString -> Either String a
   smpDecode = parseAll smpP
+  {-# INLINE smpDecode #-}
 
   -- | protocol parser of type (default implementation parses protocol ByteString encoding)
   smpP :: Parser a
   smpP = smpDecode <$?> smpP
+  {-# INLINE smpP #-}
 
 instance Encoding Char where
   smpEncode = B.singleton

src/Simplex/Messaging/Encoding/String.hs

@@ -28,6 +28,8 @@ import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
 import Data.Char (isAlphaNum)
 import Data.Int (Int64)
+import Data.IntSet (IntSet)
+import qualified Data.IntSet as IS
 import qualified Data.List.NonEmpty as L
 import Data.Set (Set)
 import qualified Data.Set as S
@@ -39,7 +41,7 @@ import Data.Time.Format.ISO8601
 import Data.Word (Word16, Word32)
 import Simplex.Messaging.Encoding
 import Simplex.Messaging.Parsers (parseAll)
-import Simplex.Messaging.Util ((<$?>))
+import Simplex.Messaging.Util (bshow, (<$?>))
 
 class TextEncoding a where
   textEncode :: a -> Text
@@ -53,14 +55,20 @@ class StrEncoding a where
   -- Please note - if you only specify strDecode, it will use base64urlP as default parser before decoding the string
   strDecode :: ByteString -> Either String a
   strDecode = parseAll strP
+  {-# INLINE strDecode #-}
+
   strP :: Parser a
   strP = strDecode <$?> base64urlP
+  {-# INLINE strP #-}
 
 -- base64url encoding/decoding of ByteStrings - the parser only allows non-empty strings
 instance StrEncoding ByteString where
   strEncode = U.encode
+  {-# INLINE strEncode #-}
   strDecode = U.decode
+  {-# INLINE strDecode #-}
   strP = base64urlP
+  {-# INLINE strP #-}
 
 base64urlP :: Parser ByteString
 base64urlP = do
@@ -119,15 +127,15 @@ instance StrEncoding Bool where
   {-# INLINE strP #-}
 
 instance StrEncoding Int where
-  strEncode = B.pack . show
+  strEncode = bshow
   {-# INLINE strEncode #-}
-  strP = A.decimal
+  strP = A.signed A.decimal
   {-# INLINE strP #-}
 
 instance StrEncoding Int64 where
-  strEncode = B.pack . show
+  strEncode = bshow
   {-# INLINE strEncode #-}
-  strP = A.decimal
+  strP = A.signed A.decimal
   {-# INLINE strP #-}
 
 instance StrEncoding SystemTime where
@@ -154,6 +162,10 @@ instance (StrEncoding a, Ord a) => StrEncoding (Set a) where
   strEncode = strEncodeList . S.toList
   strP = S.fromList <$> listItem `A.sepBy'` A.char ','
 
+instance StrEncoding IntSet where
+  strEncode = strEncodeList . IS.toList
+  strP = IS.fromList <$> listItem `A.sepBy'` A.char ','
+
 listItem :: StrEncoding a => Parser a
 listItem = parseAll strP <$?> A.takeTill (\c -> c == ',' || c == ' ' || c == '\n')
 

src/Simplex/Messaging/Notifications/Client.hs

@@ -1,28 +1,36 @@
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE PatternSynonyms #-}
+{-# LANGUAGE TypeApplications #-}
 
 module Simplex.Messaging.Notifications.Client where
 
 import Control.Monad.Except
 import Control.Monad.Trans.Except
+import Data.List.NonEmpty (NonEmpty (..))
+import qualified Data.List.NonEmpty as L
 import Data.Word (Word16)
 import Simplex.Messaging.Client
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Notifications.Protocol
 import Simplex.Messaging.Notifications.Transport (NTFVersion, supportedClientNTFVRange, supportedNTFHandshakes)
-import Simplex.Messaging.Protocol (ErrorType)
+import Simplex.Messaging.Protocol (ErrorType, pattern NoEntity)
+import Simplex.Messaging.Transport (TLS, Transport (..))
 
 type NtfClient = ProtocolClient NTFVersion ErrorType NtfResponse
 
 type NtfClientError = ProtocolClientError ErrorType
 
 defaultNTFClientConfig :: ProtocolClientConfig NTFVersion
-defaultNTFClientConfig = defaultClientConfig (Just supportedNTFHandshakes) supportedClientNTFVRange
+defaultNTFClientConfig =
+  (defaultClientConfig (Just supportedNTFHandshakes) False supportedClientNTFVRange)
+    {defaultTransport = ("443", transport @TLS)}
+{-# INLINE defaultNTFClientConfig #-}
 
 ntfRegisterToken :: NtfClient -> C.APrivateAuthKey -> NewNtfEntity 'Token -> ExceptT NtfClientError IO (NtfTokenId, C.PublicKeyX25519)
 ntfRegisterToken c pKey newTkn =
-  sendNtfCommand c (Just pKey) "" (TNEW newTkn) >>= \case
+  sendNtfCommand c (Just pKey) NoEntity (TNEW newTkn) >>= \case
     NRTknId tknId dhKey -> pure (tknId, dhKey)
     r -> throwE $ unexpectedResponse r
 
@@ -46,16 +54,34 @@ ntfEnableCron c pKey tknId int = okNtfCommand (TCRN int) c pKey tknId
 
 ntfCreateSubscription :: NtfClient -> C.APrivateAuthKey -> NewNtfEntity 'Subscription -> ExceptT NtfClientError IO NtfSubscriptionId
 ntfCreateSubscription c pKey newSub =
-  sendNtfCommand c (Just pKey) "" (SNEW newSub) >>= \case
+  sendNtfCommand c (Just pKey) NoEntity (SNEW newSub) >>= \case
     NRSubId subId -> pure subId
     r -> throwE $ unexpectedResponse r
 
+ntfCreateSubscriptions :: NtfClient -> C.APrivateAuthKey -> NonEmpty (NewNtfEntity 'Subscription) -> IO (NonEmpty (Either NtfClientError NtfSubscriptionId))
+ntfCreateSubscriptions c pKey newSubs = L.map process <$> sendProtocolCommands c cs
+  where
+    cs = L.map (\newSub -> (Just pKey, NoEntity, NtfCmd SSubscription $ SNEW newSub)) newSubs
+    process (Response _ r) = case r of
+      Right (NRSubId subId) -> Right subId
+      Right r' -> Left $ unexpectedResponse r'
+      Left e -> Left e
+
 ntfCheckSubscription :: NtfClient -> C.APrivateAuthKey -> NtfSubscriptionId -> ExceptT NtfClientError IO NtfSubStatus
 ntfCheckSubscription c pKey subId =
   sendNtfCommand c (Just pKey) subId SCHK >>= \case
     NRSub stat -> pure stat
     r -> throwE $ unexpectedResponse r
 
+ntfCheckSubscriptions :: NtfClient -> C.APrivateAuthKey -> NonEmpty NtfSubscriptionId -> IO (NonEmpty (Either NtfClientError NtfSubStatus))
+ntfCheckSubscriptions c pKey subIds = L.map process <$> sendProtocolCommands c cs
+  where
+    cs = L.map (\subId -> (Just pKey, subId, NtfCmd SSubscription SCHK)) subIds
+    process (Response _ r) = case r of
+      Right (NRSub stat) -> Right stat
+      Right r' -> Left $ unexpectedResponse r'
+      Left e -> Left e
+
 ntfDeleteSubscription :: NtfClient -> C.APrivateAuthKey -> NtfSubscriptionId -> ExceptT NtfClientError IO ()
 ntfDeleteSubscription = okNtfCommand SDEL
 

src/Simplex/Messaging/Notifications/Protocol.hs

@@ -20,13 +20,15 @@ import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
 import Data.Functor (($>))
 import Data.Kind
+import Data.List.NonEmpty (NonEmpty (..))
+import qualified Data.List.NonEmpty as L
 import Data.Maybe (isNothing)
 import Data.Text.Encoding (decodeLatin1, encodeUtf8)
+import Data.Time.Clock.System
 import Data.Type.Equality
 import Data.Word (Word16)
-import Database.SQLite.Simple.FromField (FromField (..))
-import Database.SQLite.Simple.ToField (ToField (..))
 import Simplex.Messaging.Agent.Protocol (updateSMPServerHosts)
+import Simplex.Messaging.Agent.Store.DB (FromField (..), ToField (..))
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Encoding
 import Simplex.Messaging.Encoding.String
@@ -208,7 +210,7 @@ instance NtfEntityI e => ProtocolEncoding NTFVersion ErrorType (NtfCommand e) wh
   fromProtocolError = fromProtocolError @NTFVersion @ErrorType @NtfResponse
   {-# INLINE fromProtocolError #-}
 
-  checkCredentials (auth, _, entityId, _) cmd = case cmd of
+  checkCredentials (auth, _, EntityId entityId, _) cmd = case cmd of
     -- TNEW and SNEW must have signature but NOT token/subscription IDs
     TNEW {} -> sigNoEntity
     SNEW {} -> sigNoEntity
@@ -322,7 +324,7 @@ instance ProtocolEncoding NTFVersion ErrorType NtfResponse where
     PEBlock -> BLOCK
   {-# INLINE fromProtocolError #-}
 
-  checkCredentials (_, _, entId, _) cmd = case cmd of
+  checkCredentials (_, _, EntityId entId, _) cmd = case cmd of
     -- IDTKN response must not have queue ID
     NRTknId {} -> noEntity
     -- IDSUB response must not have queue ID
@@ -426,7 +428,31 @@ instance FromJSON DeviceToken where
     t <- encodeUtf8 <$> o .: "token"
     pure $ DeviceToken pp t
 
-type NtfEntityId = ByteString
+-- List of PNMessageData uses semicolon-separated encoding instead of strEncode,
+-- because strEncode of NonEmpty list uses comma for separator,
+-- and encoding of PNMessageData's smpQueue has comma in list of hosts
+encodePNMessages :: NonEmpty PNMessageData -> ByteString
+encodePNMessages = B.intercalate ";" . map strEncode . L.toList
+
+pnMessagesP :: A.Parser (NonEmpty PNMessageData)
+pnMessagesP = L.fromList <$> strP `A.sepBy1` A.char ';'
+
+data PNMessageData = PNMessageData
+  { smpQueue :: SMPQueueNtf,
+    ntfTs :: SystemTime,
+    nmsgNonce :: C.CbNonce,
+    encNMsgMeta :: EncNMsgMeta
+  }
+  deriving (Show)
+
+instance StrEncoding PNMessageData where
+  strEncode PNMessageData {smpQueue, ntfTs, nmsgNonce, encNMsgMeta} =
+    strEncode (smpQueue, ntfTs, nmsgNonce, encNMsgMeta)
+  strP = do
+    (smpQueue, ntfTs, nmsgNonce, encNMsgMeta) <- strP
+    pure PNMessageData {smpQueue, ntfTs, nmsgNonce, encNMsgMeta}
+
+type NtfEntityId = EntityId
 
 type NtfSubscriptionId = NtfEntityId
 
@@ -443,6 +469,8 @@ data NtfSubStatus
     NSInactive
   | -- | END received
     NSEnd
+  | -- | DELD received (connection was deleted)
+    NSDeleted
   | -- | SMP AUTH error
     NSAuth
   | -- | SMP error other than AUTH
@@ -456,6 +484,7 @@ ntfShouldSubscribe = \case
   NSActive -> True
   NSInactive -> True
   NSEnd -> False
+  NSDeleted -> False
   NSAuth -> False
   NSErr _ -> False
 
@@ -466,6 +495,7 @@ instance Encoding NtfSubStatus where
     NSActive -> "ACTIVE"
     NSInactive -> "INACTIVE"
     NSEnd -> "END"
+    NSDeleted -> "DELETED"
     NSAuth -> "AUTH"
     NSErr err -> "ERR " <> err
   smpP =
@@ -475,6 +505,7 @@ instance Encoding NtfSubStatus where
       "ACTIVE" -> pure NSActive
       "INACTIVE" -> pure NSInactive
       "END" -> pure NSEnd
+      "DELETED" -> pure NSDeleted
       "AUTH" -> pure NSAuth
       "ERR" -> NSErr <$> (A.space *> A.takeByteString)
       _ -> fail "bad NtfSubStatus"

src/Simplex/Messaging/Notifications/Server.hs

@@ -1,3 +1,5 @@
+{-# LANGUAGE CPP #-}
+{-# LANGUAGE BangPatterns #-}
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE FlexibleContexts #-}
@@ -7,6 +9,7 @@
 {-# LANGUAGE NumericUnderscores #-}
 {-# LANGUAGE OverloadedLists #-}
 {-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE PatternSynonyms #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TupleSections #-}
 
@@ -16,11 +19,17 @@ import Control.Logger.Simple
 import Control.Monad
 import Control.Monad.Except
 import Control.Monad.Reader
+import Data.Bifunctor (first)
+import qualified Data.ByteString.Builder as BLD
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
+import qualified Data.ByteString.Lazy.Char8 as LB
+import Data.Either (partitionEithers)
 import Data.Functor (($>))
+import Data.IORef
 import Data.Int (Int64)
-import Data.List (intercalate, sort)
+import qualified Data.IntSet as IS
+import Data.List (intercalate, partition, sort)
 import Data.List.NonEmpty (NonEmpty (..))
 import qualified Data.List.NonEmpty as L
 import qualified Data.Map.Strict as M
@@ -30,34 +39,43 @@ import Data.Text.Encoding (decodeLatin1)
 import Data.Time.Clock (UTCTime (..), diffTimeToPicoseconds, getCurrentTime)
 import Data.Time.Clock.System (getSystemTime)
 import Data.Time.Format.ISO8601 (iso8601Show)
-import Network.Socket (ServiceName)
+import GHC.IORef (atomicSwapIORef)
+import GHC.Stats (getRTSStats)
+import Network.Socket (ServiceName, Socket, socketToHandle)
 import Simplex.Messaging.Client (ProtocolClientError (..), SMPClientError, ServerTransmission (..))
 import Simplex.Messaging.Client.Agent
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Notifications.Protocol
+import Simplex.Messaging.Notifications.Server.Control
 import Simplex.Messaging.Notifications.Server.Env
-import Simplex.Messaging.Notifications.Server.Push.APNS (PNMessageData (..), PushNotification (..), PushProviderError (..))
+import Simplex.Messaging.Notifications.Server.Push.APNS (PushNotification (..), PushProviderError (..))
 import Simplex.Messaging.Notifications.Server.Stats
 import Simplex.Messaging.Notifications.Server.Store
 import Simplex.Messaging.Notifications.Server.StoreLog
 import Simplex.Messaging.Notifications.Transport
-import Simplex.Messaging.Protocol (ErrorType (..), ProtocolServer (host), SMPServer, SignedTransmission, Transmission, encodeTransmission, tGet, tPut)
+import Simplex.Messaging.Protocol (EntityId (..), ErrorType (..), ProtocolServer (host), SMPServer, SignedTransmission, Transmission, pattern NoEntity, pattern SMPServer, encodeTransmission, tGet, tPut)
 import qualified Simplex.Messaging.Protocol as SMP
 import Simplex.Messaging.Server
-import Simplex.Messaging.Server.Stats
+import Simplex.Messaging.Server.Control (CPClientRole (..))
+import Simplex.Messaging.Server.Stats (PeriodStats (..), PeriodStatCounts (..), periodStatCounts, updatePeriodStats)
+import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
-import Simplex.Messaging.Transport (ATransport (..), THandle (..), THandleAuth (..), THandleParams (..), TProxy, Transport (..), TransportPeer (..))
-import Simplex.Messaging.Transport.Server (runTransportServer, tlsServerCredentials)
+import Simplex.Messaging.Transport (ATransport (..), THandle (..), THandleAuth (..), THandleParams (..), TProxy, Transport (..), TransportPeer (..), defaultSupportedParams)
+import Simplex.Messaging.Transport.Buffer (trimCR)
+import Simplex.Messaging.Transport.Server (AddHTTP, runTransportServer, runLocalTCPServer)
 import Simplex.Messaging.Util
 import System.Exit (exitFailure)
-import System.IO (BufferMode (..), hPutStrLn, hSetBuffering)
+import System.IO (BufferMode (..), hClose, hPrint, hPutStrLn, hSetBuffering, hSetNewlineMode, universalNewlineMode)
 import System.Mem.Weak (deRefWeak)
-import UnliftIO (IOMode (..), async, uninterruptibleCancel, withFile)
+import UnliftIO (IOMode (..), UnliftIO, askUnliftIO, async, uninterruptibleCancel, unliftIO, withFile)
 import UnliftIO.Concurrent (forkIO, killThread, mkWeakThreadId)
 import UnliftIO.Directory (doesFileExist, renameFile)
 import UnliftIO.Exception
 import UnliftIO.STM
+#if MIN_VERSION_base(4,18,0)
+import GHC.Conc (listThreads)
+#endif
 
 runNtfServer :: NtfServerConfig -> IO ()
 runNtfServer cfg = do
@@ -71,18 +89,19 @@ type M a = ReaderT NtfEnv IO a
 
 ntfServer :: NtfServerConfig -> TMVar Bool -> M ()
 ntfServer cfg@NtfServerConfig {transports, transportConfig = tCfg} started = do
+  restoreServerLastNtfs
   restoreServerStats
   s <- asks subscriber
   ps <- asks pushServer
   resubscribe s
-  raceAny_ (ntfSubscriber s : ntfPush ps : map runServer transports <> serverStatsThread_ cfg) `finally` stopServer
+  raceAny_ (ntfSubscriber s : ntfPush ps : map runServer transports <> serverStatsThread_ cfg <> controlPortThread_ cfg) `finally` stopServer
   where
-    runServer :: (ServiceName, ATransport) -> M ()
-    runServer (tcpPort, ATransport t) = do
-      serverParams <- asks tlsServerParams
-      serverSignKey <- either fail pure . fromTLSCredentials $ tlsServerCredentials serverParams
+    runServer :: (ServiceName, ATransport, AddHTTP) -> M ()
+    runServer (tcpPort, ATransport t, _addHTTP) = do
+      srvCreds <- asks tlsServerCreds
+      serverSignKey <- either fail pure $ fromTLSCredentials srvCreds
       env <- ask
-      liftIO $ runTransportServer started tcpPort serverParams tCfg $ \h -> runClient serverSignKey t h `runReaderT` env
+      liftIO $ runTransportServer started tcpPort defaultSupportedParams srvCreds (Just supportedNTFHandshakes) tCfg $ \h -> runClient serverSignKey t h `runReaderT` env
     fromTLSCredentials (_, pk) = C.x509ToPrivate (pk, []) >>= C.privKey
 
     runClient :: Transport c => C.APrivateSignKey -> TProxy c -> c -> M ()
@@ -96,11 +115,15 @@ ntfServer cfg@NtfServerConfig {transports, transportConfig = tCfg} started = do
 
     stopServer :: M ()
     stopServer = do
-      withNtfLog closeStoreLog
-      saveServerStats
+      logInfo "Saving server state..."
+      saveServer
       NtfSubscriber {smpSubscribers, smpAgent} <- asks subscriber
       liftIO $ readTVarIO smpSubscribers >>= mapM_ (\SMPSubscriber {subThreadId} -> readTVarIO subThreadId >>= mapM_ (deRefWeak >=> mapM_ killThread))
       liftIO $ closeSMPClientAgent smpAgent
+      logInfo "Server stopped"
+
+    saveServer :: M ()
+    saveServer = withNtfLog closeStoreLog >> saveServerLastNtfs >> saveServerStats
 
     serverStatsThread_ :: NtfServerConfig -> [M ()]
     serverStatsThread_ NtfServerConfig {logStatsInterval = Just interval, logStatsStartTime, serverStatsLogFile} =
@@ -118,16 +141,16 @@ ntfServer cfg@NtfServerConfig {transports, transportConfig = tCfg} started = do
         withFile statsFilePath AppendMode $ \h -> liftIO $ do
           hSetBuffering h LineBuffering
           ts <- getCurrentTime
-          fromTime' <- atomically $ swapTVar fromTime ts
-          tknCreated' <- atomically $ swapTVar tknCreated 0
-          tknVerified' <- atomically $ swapTVar tknVerified 0
-          tknDeleted' <- atomically $ swapTVar tknDeleted 0
-          subCreated' <- atomically $ swapTVar subCreated 0
-          subDeleted' <- atomically $ swapTVar subDeleted 0
-          ntfReceived' <- atomically $ swapTVar ntfReceived 0
-          ntfDelivered' <- atomically $ swapTVar ntfDelivered 0
-          tkn <- atomically $ periodStatCounts activeTokens ts
-          sub <- atomically $ periodStatCounts activeSubs ts
+          fromTime' <- atomicSwapIORef fromTime ts
+          tknCreated' <- atomicSwapIORef tknCreated 0
+          tknVerified' <- atomicSwapIORef tknVerified 0
+          tknDeleted' <- atomicSwapIORef tknDeleted 0
+          subCreated' <- atomicSwapIORef subCreated 0
+          subDeleted' <- atomicSwapIORef subDeleted 0
+          ntfReceived' <- atomicSwapIORef ntfReceived 0
+          ntfDelivered' <- atomicSwapIORef ntfDelivered 0
+          tkn <- liftIO $ periodStatCounts activeTokens ts
+          sub <- liftIO $ periodStatCounts activeSubs ts
           hPutStrLn h $
             intercalate
               ","
@@ -148,6 +171,131 @@ ntfServer cfg@NtfServerConfig {transports, transportConfig = tCfg} started = do
               ]
         liftIO $ threadDelay' interval
 
+    controlPortThread_ :: NtfServerConfig -> [M ()]
+    controlPortThread_ NtfServerConfig {controlPort = Just port} = [runCPServer port]
+    controlPortThread_ _ = []
+
+    runCPServer :: ServiceName -> M ()
+    runCPServer port = do
+      cpStarted <- newEmptyTMVarIO
+      u <- askUnliftIO
+      liftIO $ do
+        labelMyThread "control port server"
+        runLocalTCPServer cpStarted port $ runCPClient u
+      where
+        runCPClient :: UnliftIO (ReaderT NtfEnv IO) -> Socket -> IO ()
+        runCPClient u sock = do
+          labelMyThread "control port client"
+          h <- socketToHandle sock ReadWriteMode
+          hSetBuffering h LineBuffering
+          hSetNewlineMode h universalNewlineMode
+          hPutStrLn h "Ntf server control port\n'help' for supported commands"
+          role <- newTVarIO CPRNone
+          cpLoop h role
+          where
+            cpLoop h role = do
+              s <- trimCR <$> B.hGetLine h
+              case strDecode s of
+                Right CPQuit -> hClose h
+                Right cmd -> logCmd s cmd >> processCP h role cmd >> cpLoop h role
+                Left err -> hPutStrLn h ("error: " <> err) >> cpLoop h role
+            logCmd s cmd = when shouldLog $ logWarn $ "ControlPort: " <> tshow s
+              where
+                shouldLog = case cmd of
+                  CPAuth _ -> False
+                  CPHelp -> False
+                  CPQuit -> False
+                  CPSkip -> False
+                  _ -> True
+            processCP h role = \case
+              CPAuth auth -> atomically $ writeTVar role $! newRole cfg
+                where
+                  newRole NtfServerConfig {controlPortUserAuth = user, controlPortAdminAuth = admin}
+                    | Just auth == admin = CPRAdmin
+                    | Just auth == user = CPRUser
+                    | otherwise = CPRNone
+              CPStats -> withUserRole $ do
+                ss <- unliftIO u $ asks serverStats
+                let getStat :: (NtfServerStats -> IORef a) -> IO a
+                    getStat var = readIORef (var ss)
+                    putStat :: Show a => String -> (NtfServerStats -> IORef a) -> IO ()
+                    putStat label var = getStat var >>= \v -> hPutStrLn h $ label <> ": " <> show v
+                putStat "fromTime" fromTime
+                putStat "tknCreated" tknCreated
+                putStat "tknVerified" tknVerified
+                putStat "tknDeleted" tknDeleted
+                putStat "subCreated" subCreated
+                putStat "subDeleted" subDeleted
+                putStat "ntfReceived" ntfReceived
+                getStat (day . activeTokens) >>= \v -> hPutStrLn h $ "daily active tokens: " <> show (IS.size v)
+                getStat (day . activeSubs) >>= \v -> hPutStrLn h $ "daily active subscriptions: " <> show (IS.size v)
+              CPStatsRTS -> tryAny getRTSStats >>= either (hPrint h) (hPrint h)
+              CPServerInfo -> readTVarIO role >>= \case
+                CPRNone -> do
+                  logError "Unauthorized control port command"
+                  hPutStrLn h "AUTH"
+                r -> do
+#if MIN_VERSION_base(4,18,0)
+                  threads <- liftIO listThreads
+                  hPutStrLn h $ "Threads: " <> show (length threads)
+#else
+                  hPutStrLn h "Threads: not available on GHC 8.10"
+#endif
+                  NtfSubscriber {smpSubscribers, smpAgent = a} <- unliftIO u $ asks subscriber
+                  putSMPWorkers a "SMP subcscribers" smpSubscribers
+                  let SMPClientAgent {smpClients, smpSessions, srvSubs, pendingSrvSubs, smpSubWorkers} = a
+                  putSMPWorkers a "SMP clients" smpClients
+                  putSMPWorkers a "SMP subscription workers" smpSubWorkers
+                  sessions <- readTVarIO smpSessions
+                  hPutStrLn h $ "SMP sessions count: " <> show (M.size sessions)
+                  putSMPSubs a "SMP subscriptions" srvSubs
+                  putSMPSubs a "Pending SMP subscriptions" pendingSrvSubs
+                  where
+                    putSMPSubs :: SMPClientAgent -> String -> TMap SMPServer (TMap SMPSub a) -> IO ()
+                    putSMPSubs a name v = do
+                      subs <- readTVarIO v
+                      (totalCnt, ownCount, otherCnt, servers, ownByServer) <- foldM countSubs (0, 0, 0, [], M.empty) $ M.assocs subs
+                      showServers a name servers
+                      hPutStrLn h $ name <> " total: " <> show totalCnt
+                      hPutStrLn h $ name <> " on own servers: " <> show ownCount
+                      when (r == CPRAdmin && not (null ownByServer)) $
+                        forM_ (M.assocs ownByServer) $ \(SMPServer (host :| _) _ _, cnt) ->
+                          hPutStrLn h $ name <> " on " <> B.unpack (strEncode host) <> ": " <> show cnt
+                      hPutStrLn h $ name <> " on other servers: " <> show otherCnt
+                      where
+                        countSubs :: (Int, Int, Int, [SMPServer], M.Map SMPServer Int) -> (SMPServer, TMap SMPSub a) -> IO (Int, Int, Int, [SMPServer], M.Map SMPServer Int)
+                        countSubs (!totalCnt, !ownCount, !otherCnt, !servers, !ownByServer) (srv, srvSubs) = do
+                          cnt <- M.size <$> readTVarIO srvSubs
+                          let totalCnt' = totalCnt + cnt
+                              ownServer = isOwnServer a srv
+                              (ownCount', otherCnt')
+                                | ownServer = (ownCount + cnt, otherCnt)
+                                | otherwise = (ownCount, otherCnt + cnt)
+                              servers' = if cnt > 0 then srv : servers else servers
+                              ownByServer'
+                                | r == CPRAdmin && ownServer && cnt > 0 = M.alter (Just . maybe cnt (+ cnt)) srv ownByServer
+                                | otherwise = ownByServer
+                          pure (totalCnt', ownCount', otherCnt', servers', ownByServer')
+                    putSMPWorkers :: SMPClientAgent -> String -> TMap SMPServer a -> IO ()
+                    putSMPWorkers a name v = readTVarIO v >>= showServers a name . M.keys
+                    showServers :: SMPClientAgent -> String -> [SMPServer] -> IO ()
+                    showServers a name srvs = do
+                      let (ownSrvs, otherSrvs) = partition (isOwnServer a) srvs
+                      hPutStrLn h $ name <> " own servers count: " <> show (length ownSrvs)
+                      when (r == CPRAdmin) $ hPutStrLn h $ name <> " own servers: " <> intercalate "," (sort $ map (\(SMPServer (host :| _) _ _) -> B.unpack $ strEncode host) ownSrvs)
+                      hPutStrLn h $ name <> " other servers count: " <> show (length otherSrvs)
+              CPHelp -> hPutStrLn h "commands: stats, stats-rts, server-info, help, quit"
+              CPQuit -> pure ()
+              CPSkip -> pure ()
+              where
+                withUserRole action =
+                  readTVarIO role >>= \case
+                    CPRAdmin -> action
+                    CPRUser -> action
+                    _ -> do
+                      logError "Unauthorized control port command"
+                      hPutStrLn h "AUTH"
+
 resubscribe :: NtfSubscriber -> M ()
 resubscribe NtfSubscriber {newSubQ} = do
   logInfo "Preparing SMP resubscriptions..."
@@ -215,14 +363,17 @@ ntfSubscriber NtfSubscriber {smpSubscribers, newSubQ, smpAgent = ca@SMPClientAge
               st <- asks store
               NtfPushServer {pushQ} <- asks pushServer
               stats <- asks serverStats
-              atomically $ updatePeriodStats (activeSubs stats) ntfId
-              atomically $
-                findNtfSubscriptionToken st smpQueue
-                  >>= mapM_ (\tkn -> writeTBQueue pushQ (tkn, PNMessage PNMessageData {smpQueue, ntfTs, nmsgNonce, encNMsgMeta}))
+              liftIO $ updatePeriodStats (activeSubs stats) ntfId
+              tkn_ <- atomically (findNtfSubscriptionToken st smpQueue)
+              forM_ tkn_ $ \tkn -> do
+                let newNtf = PNMessageData {smpQueue, ntfTs, nmsgNonce, encNMsgMeta}
+                lastNtfs <- liftIO $ addTokenLastNtf st (ntfTknId tkn) newNtf
+                atomically (writeTBQueue pushQ (tkn, PNMessage lastNtfs))
               incNtfStat ntfReceived
             Right SMP.END ->
               whenM (atomically $ activeClientSession' ca sessionId srv) $
                 updateSubStatus smpQueue NSEnd
+            Right SMP.DELD -> updateSubStatus smpQueue NSDeleted
             Right (SMP.ERR e) -> logError $ "SMP server error: " <> tshow e
             Right _ -> logError "SMP server unexpected response"
             Left e -> logError $ "SMP client error: " <> tshow e
@@ -299,7 +450,7 @@ ntfPush s@NtfPushServer {pushQ} = forever $ do
       void $ deliverNotification pp tkn ntf
     PNMessage {} -> checkActiveTkn status $ do
       stats <- asks serverStats
-      atomically $ updatePeriodStats (activeTokens stats) ntfTknId
+      liftIO $ updatePeriodStats (activeTokens stats) ntfTknId
       void $ deliverNotification pp tkn ntf
       incNtfStat ntfDelivered
   where
@@ -350,28 +501,29 @@ clientDisconnected NtfServerClient {connected} = atomically $ writeTVar connecte
 
 receive :: Transport c => THandleNTF c 'TServer -> NtfServerClient -> M ()
 receive th@THandle {params = THandleParams {thAuth}} NtfServerClient {rcvQ, sndQ, rcvActiveAt} = forever $ do
-  ts <- liftIO $ tGet th
-  forM_ ts $ \t@(_, _, (corrId, entId, cmdOrError)) -> do
-    atomically . writeTVar rcvActiveAt =<< liftIO getSystemTime
-    logDebug "received transmission"
-    case cmdOrError of
-      Left e -> write sndQ (corrId, entId, NRErr e)
-      Right cmd ->
-        verifyNtfTransmission ((,C.cbNonce (SMP.bs corrId)) <$> thAuth) t cmd >>= \case
-          VRVerified req -> write rcvQ req
-          VRFailed -> write sndQ (corrId, entId, NRErr AUTH)
+  ts <- L.toList <$> liftIO (tGet th)
+  atomically . (writeTVar rcvActiveAt $!) =<< liftIO getSystemTime
+  (errs, cmds) <- partitionEithers <$> mapM cmdAction ts
+  write sndQ errs
+  write rcvQ cmds
   where
-    write q t = atomically $ writeTBQueue q t
+    cmdAction t@(_, _, (corrId, entId, cmdOrError)) =
+      case cmdOrError of
+        Left e -> pure $ Left (corrId, entId, NRErr e)
+        Right cmd ->
+          verified <$> verifyNtfTransmission ((,C.cbNonce (SMP.bs corrId)) <$> thAuth) t cmd
+          where
+            verified = \case
+              VRVerified req -> Right req
+              VRFailed -> Left (corrId, entId, NRErr AUTH)
+    write q = mapM_ (atomically . writeTBQueue q) . L.nonEmpty
 
 send :: Transport c => THandleNTF c 'TServer -> NtfServerClient -> IO ()
 send h@THandle {params} NtfServerClient {sndQ, sndActiveAt} = forever $ do
-  t <- atomically $ readTBQueue sndQ
-  void . liftIO $ tPut h [Right (Nothing, encodeTransmission params t)]
+  ts <- atomically $ readTBQueue sndQ
+  void . liftIO $ tPut h $ L.map (\t -> Right (Nothing, encodeTransmission params t)) ts
   atomically . (writeTVar sndActiveAt $!) =<< liftIO getSystemTime
 
--- instance Show a => Show (TVar a) where
---   show x = unsafePerformIO $ show <$> readTVarIO x
-
 data VerificationResult = VRVerified NtfRequest | VRFailed
 
 verifyNtfTransmission :: Maybe (THandleAuth 'TServer, C.CbNonce) -> SignedTransmission ErrorType NtfCmd -> NtfCmd -> M VerificationResult
@@ -429,7 +581,7 @@ client :: NtfServerClient -> NtfSubscriber -> NtfPushServer -> M ()
 client NtfServerClient {rcvQ, sndQ} NtfSubscriber {newSubQ, smpAgent = ca} NtfPushServer {pushQ, intervalNotifiers} =
   forever $
     atomically (readTBQueue rcvQ)
-      >>= processCommand
+      >>= mapM processCommand
       >>= atomically . writeTBQueue sndQ
   where
     processCommand :: NtfRequest -> M (Transmission NtfResponse)
@@ -446,7 +598,7 @@ client NtfServerClient {rcvQ, sndQ} NtfSubscriber {newSubQ, smpAgent = ca} NtfPu
         atomically $ writeTBQueue pushQ (tkn, PNVerification regCode)
         withNtfLog (`logCreateToken` tkn)
         incNtfStatT token tknCreated
-        pure (corrId, "", NRTknId tknId srvDhPubKey)
+        pure (corrId, NoEntity, NRTknId tknId srvDhPubKey)
       NtfReqCmd SToken (NtfTkn tkn@NtfTknData {token, ntfTknId, tknStatus, tknRegCode, tknDhSecret, tknDhKeys = (srvDhPubKey, srvDhPrivKey), tknCronInterval}) (corrId, tknId, cmd) -> do
         status <- readTVarIO tknStatus
         (corrId,tknId,) <$> case cmd of
@@ -537,7 +689,7 @@ client NtfServerClient {rcvQ, sndQ} NtfSubscriber {newSubQ, smpAgent = ca} NtfPu
             _ -> pure $ NRErr AUTH
         withNtfLog (`logCreateSubscription` sub)
         incNtfStat subCreated
-        pure (corrId, "", resp)
+        pure (corrId, NoEntity, resp)
       NtfReqCmd SSubscription (NtfSub NtfSubData {smpQueue = SMPQueueNtf {smpServer, notifierId}, notifierKey = registeredNKey, subStatus}) (corrId, subId, cmd) -> do
         status <- readTVarIO subStatus
         (corrId,subId,) <$> case cmd of
@@ -562,7 +714,7 @@ client NtfServerClient {rcvQ, sndQ} NtfSubscriber {newSubQ, smpAgent = ca} NtfPu
           PING -> pure NRPong
       NtfReqPing corrId entId -> pure (corrId, entId, NRPong)
     getId :: M NtfEntityId
-    getId = randomBytes =<< asks (subIdBytes . config)
+    getId = fmap EntityId . randomBytes =<< asks (subIdBytes . config)
     getRegCode :: M NtfRegCode
     getRegCode = NtfRegCode <$> (randomBytes =<< asks (regCodeBytes . config))
     randomBytes :: Int -> M ByteString
@@ -575,14 +727,52 @@ client NtfServerClient {rcvQ, sndQ} NtfSubscriber {newSubQ, smpAgent = ca} NtfPu
 withNtfLog :: (StoreLog 'WriteMode -> IO a) -> M ()
 withNtfLog action = liftIO . mapM_ action =<< asks storeLog
 
-incNtfStatT :: DeviceToken -> (NtfServerStats -> TVar Int) -> M ()
+incNtfStatT :: DeviceToken -> (NtfServerStats -> IORef Int) -> M ()
 incNtfStatT (DeviceToken PPApnsNull _) _ = pure ()
 incNtfStatT _ statSel = incNtfStat statSel
 
-incNtfStat :: (NtfServerStats -> TVar Int) -> M ()
+incNtfStat :: (NtfServerStats -> IORef Int) -> M ()
 incNtfStat statSel = do
   stats <- asks serverStats
-  atomically $ modifyTVar' (statSel stats) (+ 1)
+  liftIO $ atomicModifyIORef'_ (statSel stats) (+ 1)
+
+saveServerLastNtfs :: M ()
+saveServerLastNtfs = asks (storeLastNtfsFile . config) >>= mapM_ saveLastNtfs
+  where
+    saveLastNtfs f = do
+      logInfo $ "saving last notifications to file " <> T.pack f
+      NtfStore {tokenLastNtfs} <- asks store
+      liftIO . withFile f WriteMode $ \h ->
+        readTVarIO tokenLastNtfs >>= mapM_ (saveTokenLastNtfs h) . M.assocs
+      logInfo "notifications saved"
+      where
+        -- reverse on save, to save notifications in order, will become reversed again when restoring.
+        saveTokenLastNtfs h (tknId, v) = BLD.hPutBuilder h . encodeLastNtfs tknId . L.reverse =<< readTVarIO v
+        encodeLastNtfs tknId = mconcat . L.toList . L.map (\ntf -> BLD.byteString (strEncode $ TNMRv1 tknId ntf) <> BLD.char8 '\n')
+
+restoreServerLastNtfs :: M ()
+restoreServerLastNtfs =
+  asks (storeLastNtfsFile . config) >>= mapM_ restoreLastNtfs
+  where
+    restoreLastNtfs f =
+      whenM (doesFileExist f) $ do
+        logInfo $ "restoring last notifications from file " <> T.pack f
+        st <- asks store
+        runExceptT (liftIO (LB.readFile f) >>= mapM (restoreNtf st) . LB.lines) >>= \case
+          Left e -> do
+            logError . T.pack $ "error restoring last notifications: " <> e
+            liftIO exitFailure
+          Right _ -> do
+            renameFile f $ f <> ".bak"
+            logInfo "last notifications restored"
+      where
+        restoreNtf st s' = do
+          TNMRv1 tknId ntf <- liftEither . first (ntfErr "parsing") $ strDecode s
+          liftIO $ storeTokenLastNtf st tknId ntf
+          where
+            s = LB.toStrict s'
+            ntfErr :: Show e => String -> e -> String
+            ntfErr op e = op <> " error (" <> show e <> "): " <> B.unpack (B.take 100 s)
 
 saveServerStats :: M ()
 saveServerStats =
@@ -602,7 +792,7 @@ restoreServerStats = asks (serverStatsBackupFile . config) >>= mapM_ restoreStat
       liftIO (strDecode <$> B.readFile f) >>= \case
         Right d -> do
           s <- asks serverStats
-          atomically $ setNtfServerStats s d
+          liftIO $ setNtfServerStats s d
           renameFile f $ f <> ".bak"
           logInfo "server stats restored"
         Left e -> do

src/Simplex/Messaging/Notifications/Server/Control.hs

@@ -0,0 +1,37 @@
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+module Simplex.Messaging.Notifications.Server.Control where
+
+import qualified Data.Attoparsec.ByteString.Char8 as A
+import Simplex.Messaging.Encoding.String
+import Simplex.Messaging.Protocol (BasicAuth)
+
+data ControlProtocol
+  = CPAuth BasicAuth
+  | CPStats
+  | CPStatsRTS
+  | CPServerInfo
+  | CPHelp
+  | CPQuit
+  | CPSkip
+
+instance StrEncoding ControlProtocol where
+  strEncode = \case
+    CPAuth tok -> "auth " <> strEncode tok
+    CPStats -> "stats"
+    CPStatsRTS -> "stats-rts"
+    CPServerInfo -> "server-info"
+    CPHelp -> "help"
+    CPQuit -> "quit"
+    CPSkip -> ""
+  strP =
+    A.takeTill (== ' ') >>= \case
+      "auth" -> CPAuth <$> _strP
+      "stats" -> pure CPStats
+      "stats-rts" -> pure CPStatsRTS
+      "server-info" -> pure CPServerInfo
+      "help" -> pure CPHelp
+      "quit" -> pure CPQuit
+      "" -> pure CPSkip
+      _ -> fail "bad ControlProtocol command"

src/Simplex/Messaging/Notifications/Server/Env.hs

@@ -28,18 +28,21 @@ import Simplex.Messaging.Notifications.Server.Stats
 import Simplex.Messaging.Notifications.Server.Store
 import Simplex.Messaging.Notifications.Server.StoreLog
 import Simplex.Messaging.Notifications.Transport (NTFVersion, VersionRangeNTF)
-import Simplex.Messaging.Protocol (CorrId, SMPServer, Transmission)
+import Simplex.Messaging.Protocol (BasicAuth, CorrId, SMPServer, Transmission)
 import Simplex.Messaging.Server.Expiration
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
 import Simplex.Messaging.Transport (ATransport, THandleParams, TransportPeer (..))
-import Simplex.Messaging.Transport.Server (TransportServerConfig, alpn, loadFingerprint, loadTLSServerParams)
+import Simplex.Messaging.Transport.Server (AddHTTP, ServerCredentials, TransportServerConfig, loadFingerprint, loadServerCredential)
 import System.IO (IOMode (..))
 import System.Mem.Weak (Weak)
 import UnliftIO.STM
 
 data NtfServerConfig = NtfServerConfig
-  { transports :: [(ServiceName, ATransport)],
+  { transports :: [(ServiceName, ATransport, AddHTTP)],
+    controlPort :: Maybe ServiceName,
+    controlPortUserAuth :: Maybe BasicAuth,
+    controlPortAdminAuth :: Maybe BasicAuth,
     subIdBytes :: Int,
     regCodeBytes :: Int,
     clientQSize :: Natural,
@@ -50,10 +53,8 @@ data NtfServerConfig = NtfServerConfig
     subsBatchSize :: Int,
     inactiveClientExpiration :: Maybe ExpirationConfig,
     storeLogFile :: Maybe FilePath,
-    -- CA certificate private key is not needed for initialization
-    caCertificateFile :: FilePath,
-    privateKeyFile :: FilePath,
-    certificateFile :: FilePath,
+    storeLastNtfsFile :: Maybe FilePath,
+    ntfCredentials :: ServerCredentials,
     -- stats config - see SMP server config
     logStatsInterval :: Maybe Int64,
     logStatsStartTime :: Int64,
@@ -77,13 +78,13 @@ data NtfEnv = NtfEnv
     store :: NtfStore,
     storeLog :: Maybe (StoreLog 'WriteMode),
     random :: TVar ChaChaDRG,
-    tlsServerParams :: T.ServerParams,
+    tlsServerCreds :: T.Credential,
     serverIdentity :: C.KeyHash,
     serverStats :: NtfServerStats
   }
 
 newNtfServerEnv :: NtfServerConfig -> IO NtfEnv
-newNtfServerEnv config@NtfServerConfig {subQSize, pushQSize, smpAgentCfg, apnsConfig, storeLogFile, caCertificateFile, certificateFile, privateKeyFile, transportConfig} = do
+newNtfServerEnv config@NtfServerConfig {subQSize, pushQSize, smpAgentCfg, apnsConfig, storeLogFile, ntfCredentials} = do
   random <- C.newRandom
   store <- newNtfStore
   logInfo "restoring subscriptions..."
@@ -91,10 +92,10 @@ newNtfServerEnv config@NtfServerConfig {subQSize, pushQSize, smpAgentCfg, apnsCo
   logInfo "restored subscriptions"
   subscriber <- newNtfSubscriber subQSize smpAgentCfg random
   pushServer <- newNtfPushServer pushQSize apnsConfig
-  tlsServerParams <- loadTLSServerParams caCertificateFile certificateFile privateKeyFile (alpn transportConfig)
-  Fingerprint fp <- loadFingerprint caCertificateFile
+  tlsServerCreds <- loadServerCredential ntfCredentials
+  Fingerprint fp <- loadFingerprint ntfCredentials
   serverStats <- newNtfServerStats =<< getCurrentTime
-  pure NtfEnv {config, subscriber, pushServer, store, storeLog, random, tlsServerParams, serverIdentity = C.KeyHash fp, serverStats}
+  pure NtfEnv {config, subscriber, pushServer, store, storeLog, random, tlsServerCreds, serverIdentity = C.KeyHash fp, serverStats}
 
 data NtfSubscriber = NtfSubscriber
   { smpSubscribers :: TMap SMPServer SMPSubscriber,
@@ -158,8 +159,8 @@ data NtfRequest
   | NtfReqPing CorrId NtfEntityId
 
 data NtfServerClient = NtfServerClient
-  { rcvQ :: TBQueue NtfRequest,
-    sndQ :: TBQueue (Transmission NtfResponse),
+  { rcvQ :: TBQueue (NonEmpty NtfRequest),
+    sndQ :: TBQueue (NonEmpty (Transmission NtfResponse)),
     ntfThParams :: THandleParams NTFVersion 'TServer,
     connected :: TVar Bool,
     rcvActiveAt :: TVar SystemTime,

src/Simplex/Messaging/Notifications/Server/Main.hs

@@ -5,6 +5,7 @@
 {-# LANGUAGE OverloadedLists #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE PatternSynonyms #-}
+{-# OPTIONS_GHC -fno-warn-ambiguous-fields #-}
 
 module Simplex.Messaging.Notifications.Server.Main where
 
@@ -13,22 +14,23 @@ import Data.Functor (($>))
 import Data.Ini (lookupValue, readIniFile)
 import Data.Maybe (fromMaybe)
 import qualified Data.Text as T
+import Data.Text.Encoding (encodeUtf8)
 import qualified Data.Text.IO as T
 import Network.Socket (HostName)
 import Options.Applicative
-import Simplex.Messaging.Client (NetworkConfig (..), ProtocolClientConfig (..), SocksMode (..), defaultNetworkConfig)
+import Simplex.Messaging.Client (HostMode (..), NetworkConfig (..), ProtocolClientConfig (..), SocksMode (..), defaultNetworkConfig, textToHostMode)
 import Simplex.Messaging.Client.Agent (SMPClientAgentConfig (..), defaultSMPClientAgentConfig)
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Notifications.Server (runNtfServer)
 import Simplex.Messaging.Notifications.Server.Env (NtfServerConfig (..), defaultInactiveClientExpiration)
 import Simplex.Messaging.Notifications.Server.Push.APNS (defaultAPNSPushClientConfig)
-import Simplex.Messaging.Notifications.Transport (supportedNTFHandshakes, supportedServerNTFVRange)
+import Simplex.Messaging.Notifications.Transport (supportedServerNTFVRange)
 import Simplex.Messaging.Protocol (ProtoServerWithAuth (..), pattern NtfServer)
 import Simplex.Messaging.Server.CLI
 import Simplex.Messaging.Server.Expiration
 import Simplex.Messaging.Transport (simplexMQVersion)
 import Simplex.Messaging.Transport.Client (TransportHost (..))
-import Simplex.Messaging.Transport.Server (TransportServerConfig (..), defaultTransportServerConfig)
+import Simplex.Messaging.Transport.Server (ServerCredentials (..), TransportServerConfig (..), defaultTransportServerConfig)
 import Simplex.Messaging.Util (tshow)
 import System.Directory (createDirectoryIfMissing, doesFileExist)
 import System.FilePath (combine)
@@ -51,7 +53,9 @@ ntfServerCLI cfgPath logPath =
         True -> readIniFile iniFile >>= either exitError runServer
         _ -> exitError $ "Error: server is not initialized (" <> iniFile <> " does not exist).\nRun `" <> executableName <> " init`."
     Delete -> do
-      confirmOrExit "WARNING: deleting the server will make all queues inaccessible, because the server identity (certificate fingerprint) will change.\nTHIS CANNOT BE UNDONE!"
+      confirmOrExit
+        "WARNING: deleting the server will make all queues inaccessible, because the server identity (certificate fingerprint) will change.\nTHIS CANNOT BE UNDONE!"
+        "Server NOT deleted"
       deleteDirIfExists cfgPath
       deleteDirIfExists logPath
       putStrLn "Deleted configuration and log files"
@@ -83,21 +87,38 @@ ntfServerCLI cfgPath logPath =
           \# and restoring it when the server is started.\n\
           \# Log is compacted on start (deleted objects are removed).\n"
             <> ("enable: " <> onOff enableStoreLog <> "\n\n")
+            <> "# Last notifications are optionally saved and restored when the server restarts,\n\
+               \# they are preserved in the .bak file until the next restart.\n"
+            <> ("restore_last_notifications: " <> onOff enableStoreLog <> "\n\n")
             <> "log_stats: off\n\n\
+               \[AUTH]\n\
+               \# control_port_admin_password:\n\
+               \# control_port_user_password:\n\
+               \\n\
                \[TRANSPORT]\n\
-               \# host is only used to print server address on start\n"
+               \# Host is only used to print server address on start.\n\
+               \# You can specify multiple server ports.\n"
             <> ("host: " <> T.pack host <> "\n")
             <> ("port: " <> T.pack defaultServerPort <> "\n")
-            <> "log_tls_errors: off\n"
-            <> "websockets: off\n\n\
+            <> "log_tls_errors: off\n\n\
+               \# Use `websockets: 443` to run websockets server in addition to plain TLS.\n\
+               \websockets: off\n\n\
+               \# control_port: 5227\n\
+               \\n\
                \[SUBSCRIBER]\n\
                \# Network configuration for notification server client.\n\
+               \# `host_mode` can be 'public' (default) or 'onion'.\n\
+               \# It defines prefferred hostname for destination servers with multiple hostnames.\n\
+               \# host_mode: public\n\
+               \# required_host_mode: off\n\n\
                \# SOCKS proxy port for subscribing to SMP servers.\n\
                \# You may need a separate instance of SOCKS proxy for incoming single-hop requests.\n\
                \# socks_proxy: localhost:9050\n\n\
                \# `socks_mode` can be 'onion' for SOCKS proxy to be used for .onion destination hosts only (default)\n\
                \# or 'always' to be used for all destination hosts (can be used if it is an .onion server).\n\
                \# socks_mode: onion\n\n\
+               \# The domain suffixes of the relays you operate (space-separated) to count as separate proxy statistics.\n\
+               \# own_server_domains: \n\n\
                \[INACTIVE_CLIENTS]\n\
                \# TTL and interval to check inactive clients\n\
                \disconnect: off\n"
@@ -118,9 +139,17 @@ ntfServerCLI cfgPath logPath =
         enableStoreLog = settingIsOn "STORE_LOG" "enable" ini
         logStats = settingIsOn "STORE_LOG" "log_stats" ini
         c = combine cfgPath . ($ defaultX509Config)
+        restoreLastNtfsFile path = case iniOnOff "STORE_LOG" "restore_last_notifications" ini of
+          Just True -> Just path
+          Just False -> Nothing
+          -- if the setting is not set, it is enabled when store log is enabled
+          _ -> enableStoreLog $> path
         serverConfig =
           NtfServerConfig
             { transports = iniTransports ini,
+              controlPort = either (const Nothing) (Just . T.unpack) $ lookupValue "TRANSPORT" "control_port" ini,
+              controlPortAdminAuth = either error id <$!> strDecodeIni "AUTH" "control_port_admin_password" ini,
+              controlPortUserAuth = either error id <$!> strDecodeIni "AUTH" "control_port_user_password" ini,
               subIdBytes = 24,
               regCodeBytes = 32,
               clientQSize = 64,
@@ -134,9 +163,12 @@ ntfServerCLI cfgPath logPath =
                             defaultNetworkConfig
                               { socksProxy = either error id <$!> strDecodeIni "SUBSCRIBER" "socks_proxy" ini,
                                 socksMode = maybe SMOnion (either error id) $! strDecodeIni "SUBSCRIBER" "socks_mode" ini,
-                                smpPingInterval = 60_000_000 -- 1 minutes
+                                hostMode = either (const HMPublic) (either error id . textToHostMode) $ lookupValue "SUBSCRIBER" "host_mode" ini,
+                                requiredHostMode = fromMaybe False $ iniOnOff "SUBSCRIBER" "required_host_mode" ini,
+                                smpPingInterval = 60_000_000 -- 1 minute
                               }
                         },
+                    ownServerDomains = either (const []) (map encodeUtf8 . T.words) $ lookupValue "SUBSCRIBER" "own_server_domains" ini,
                     persistErrorInterval = 0 -- seconds
                   },
               apnsConfig = defaultAPNSPushClientConfig,
@@ -148,9 +180,13 @@ ntfServerCLI cfgPath logPath =
                       checkInterval = readStrictIni "INACTIVE_CLIENTS" "check_interval" ini
                     },
               storeLogFile = enableStoreLog $> storeLogFilePath,
-              caCertificateFile = c caCrtFile,
-              privateKeyFile = c serverKeyFile,
-              certificateFile = c serverCrtFile,
+              storeLastNtfsFile = restoreLastNtfsFile $ combine logPath "ntf-server-last-notifications.log",
+              ntfCredentials =
+                ServerCredentials
+                  { caCertificateFile = Just $ c caCrtFile,
+                    privateKeyFile = c serverKeyFile,
+                    certificateFile = c serverCrtFile
+                  },
               logStatsInterval = logStats $> 86400, -- seconds
               logStatsStartTime = 0, -- seconds from 00:00 UTC
               serverStatsLogFile = combine logPath "ntf-server-stats.daily.log",
@@ -158,8 +194,7 @@ ntfServerCLI cfgPath logPath =
               ntfServerVRange = supportedServerNTFVRange,
               transportConfig =
                 defaultTransportServerConfig
-                  { logTLSErrors = fromMaybe False $ iniOnOff "TRANSPORT" "log_tls_errors" ini,
-                    alpn = Just supportedNTFHandshakes
+                  { logTLSErrors = fromMaybe False $ iniOnOff "TRANSPORT" "log_tls_errors" ini
                   }
             }