ntf server: better batching and logging (#780)

* ntf server: better batching and logging

* reduce batch delay for ntf server

* comments

* 5.1.3, ntf 1.4.2

* more logging

* more logging

* split large batches, more logging

* remove some logs

.github/CODEOWNERS

@@ -1 +1,4 @@
-* @epoberezkin @efim-poberezkin
+* @epoberezkin @spaced4ndy
+/Dockerfile @shumvgolove
+/scripts/docker/ @shumvgolove
+/scripts/main/ @shumvgolove

.github/workflows/build.yml

@@ -17,8 +17,10 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: ubuntu-18.04
           - os: ubuntu-20.04
+            platform_name: 20_04-x86-64
+          - os: ubuntu-22.04
+            platform_name: 22_04-x86-64
     steps:
       - name: Clone project
         uses: actions/checkout@v2
@@ -42,17 +44,18 @@ jobs:
         run: cabal build --enable-tests
 
       - name: Test
-        if: matrix.os == 'ubuntu-18.04'
         timeout-minutes: 30
         shell: bash
         run: cabal test --test-show-details=direct
 
       - name: Prepare binaries
-        if: startsWith(github.ref, 'refs/tags/v') && matrix.os == 'ubuntu-20.04'
+        if: startsWith(github.ref, 'refs/tags/v')
         shell: bash
         run: |
-          mv $(cabal list-bin smp-server) smp-server-ubuntu-20_04-x86-64
-          mv $(cabal list-bin ntf-server) ntf-server-ubuntu-20_04-x86-64
+          mv $(cabal list-bin smp-server) smp-server-ubuntu-${{ matrix.platform_name}}
+          mv $(cabal list-bin ntf-server) ntf-server-ubuntu-${{ matrix.platform_name}}
+          mv $(cabal list-bin xftp-server) xftp-server-ubuntu-${{ matrix.platform_name}}
+          mv $(cabal list-bin xftp) xftp-ubuntu-${{ matrix.platform_name}}
 
       - name: Build changelog
         if: startsWith(github.ref, 'refs/tags/v') && matrix.os == 'ubuntu-20.04'
@@ -78,8 +81,10 @@ jobs:
           prerelease: true
           files: |
             LICENSE
-            smp-server-ubuntu-20_04-x86-64
-            ntf-server-ubuntu-20_04-x86-64
+            smp-server-ubuntu-${{ matrix.platform_name}}
+            ntf-server-ubuntu-${{ matrix.platform_name}}
+            xftp-server-ubuntu-${{ matrix.platform_name}}
+            xftp-ubuntu-${{ matrix.platform_name}}
           fail_on_unmatched_files: true
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/docker-image.yml

@@ -0,0 +1,50 @@
+name: Build and push Docker image to Docker Hub
+
+on:
+  push:
+    tags:
+      - "v*"
+
+jobs:
+  build-and-push:
+    name: Build and push Docker image
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - app: smp-server
+            app_port: 5223
+          - app: xftp-server
+            app_port: 443 
+    steps:
+      - name: Clone project
+        uses: actions/checkout@v3
+
+      - name: Log in to Docker Hub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+
+      - name: Extract metadata for Docker image
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ secrets.DOCKERHUB_USERNAME }}/${{ matrix.app }}
+          flavor: |
+            latest=auto
+          tags: |
+            type=semver,pattern=v{{version}}
+            type=semver,pattern=v{{major}}.{{minor}}
+            type=semver,pattern=v{{major}}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v4
+        with:
+          push: true
+          build-args: |
+            APP=${{ matrix.app }}
+            APP_PORT=${{ matrix.app_port }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

.gitignore

@@ -7,3 +7,7 @@ dist-newstyle/
 
 cabal.project.local
 cabal.project.local~
+
+.hpc/
+*.tix
+.coverage

CHANGELOG.md

@@ -1,3 +1,45 @@
+# 5.0.0
+
+SimpleX File Transfer Protocol (XFTP):
+- XFTP server
+- XFTP CLI
+- support XFTP in the agent
+
+Other changes:
+- preserve retry interval for sending messages on agent restarts
+- support IPv6 in the servers and in the agent
+- support for 32-bit platforms
+
+Read more about XFTP in this post: https://simplex.chat/blog/20230301-simplex-file-transfer-protocol.html
+
+# 4.4.1
+
+SMP agent:
+
+- fix handling of server addresses.
+- prevent message delivery getting stuck on IO error in SMP client.
+
+# 4.4.0
+
+SMP agent:
+
+- support multiple user profiles with transport session isolation.
+- support optional transport isolation per connection.
+- batch connection deletion
+- improve asynchronous connection deletion – it may now be completed after the client is restarted as well.
+- improve subscription logic to retry if initial attempt fails.
+- end SMP client connection after a number of failed PINGs (defalt is 3).
+
+# 4.3.0
+
+SMP server:
+
+- additional server usage statistics.
+
+SMP agent:
+
+- increase retry interval when sending messages after ERR QUOTA.
+
 # 4.2.0
 
 SMP agent and server:

Dockerfile

@@ -0,0 +1,62 @@
+ARG TAG=22.04
+
+FROM ubuntu:${TAG} AS build
+
+### Build stage
+
+# Install curl and git and simplexmq dependencies
+RUN apt-get update && apt-get install -y curl git build-essential libgmp3-dev zlib1g-dev llvm-12 llvm-12-dev libnuma-dev
+
+# Specify bootstrap Haskell versions
+ENV BOOTSTRAP_HASKELL_GHC_VERSION=8.10.7
+ENV BOOTSTRAP_HASKELL_CABAL_VERSION=3.6.2.0
+
+# Install ghcup
+RUN curl --proto '=https' --tlsv1.2 -sSf https://get-ghcup.haskell.org | BOOTSTRAP_HASKELL_NONINTERACTIVE=1 sh
+
+# Adjust PATH
+ENV PATH="/root/.cabal/bin:/root/.ghcup/bin:$PATH"
+
+# Set both as default
+RUN ghcup set ghc "${BOOTSTRAP_HASKELL_GHC_VERSION}" && \
+    ghcup set cabal
+
+COPY . /project
+WORKDIR /project
+
+ARG APP
+ARG APP_PORT
+RUN if [ -z "$APP" ] || [ -z "$APP_PORT" ]; then printf "Please spcify \$APP and \$APP_PORT build-arg.\n"; exit 1; fi
+
+# Compile app
+RUN cabal update
+RUN cabal build exe:$APP
+
+# 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) && \
+    mv "$bin" ./ && \
+    strip ./"$APP" &&\
+    mv /project/scripts/docker/entrypoint-"$APP" ./entrypoint
+
+### Final stage
+FROM ubuntu:${TAG}
+
+# Install OpenSSL dependency
+RUN apt-get update && apt-get install -y openssl libnuma-dev
+
+# Copy compiled app from build stage
+COPY --from=build /final /usr/local/bin/
+
+# Open app listening port
+ARG APP_PORT
+EXPOSE $APP_PORT
+
+# simplexmq requires using SIGINT to correctly preserve undelivered messages and restore them on restart
+STOPSIGNAL SIGINT
+
+# Finally, execute helper script
+ENTRYPOINT [ "/usr/local/bin/entrypoint" ]

README.md

@@ -90,11 +90,11 @@ You can either run your own SMP server locally or deploy using [Linode StackScri
 
 It's the easiest to try SMP agent via a prototype [simplex-chat](https://github.com/simplex-chat/simplex-chat) terminal UI.
 
-## Deploy SMP server on Linux
+## Deploy SMP/XFTP servers on Linux
 
-You can run your SMP server as a Linux process, optionally using a service manager for booting and restarts.
+You can run your SMP/XFTP server as a Linux process, optionally using a service manager for booting and restarts.
 
-Notice that `smp-server` requires `openssl` as run-time dependency (it is used to generate server certificates during initialization). Install it with your packet manager:
+Notice that `smp-server` and `xftp-server` requires `openssl` as run-time dependency (it is used to generate server certificates during initialization). Install it with your packet manager:
 
 ```sh
 # For Ubuntu
@@ -105,28 +105,53 @@ apt update && apt install openssl
 
 #### Using Docker
 
-On Linux, you can deploy smp server using Docker. This will download image from [Docker Hub](https://hub.docker.com/r/simplexchat/simplexmq).
+On Linux, you can deploy smp and xftp server using Docker. This will download image from [Docker Hub](https://hub.docker.com/r/simplexchat).
 
-1. Create `config` and `logs` directories:
+1. Create directories for persistent Docker configuration:
 
    ```sh
-   mkdir -p ~/simplex/{config,logs}
+   mkdir -p $HOME/simplex/{xftp,smp}/{config,logs} && mkdir -p $HOME/simplex/xftp/files
    ```
 
-2. Run your Docker container. You must change **your_ip_or_domain**. `-e pass="password"` is optional variable to password-protect your `smp` server:
-   ```sh
-   docker run -d \
-       -e addr="your_ip_or_domain" \
-       -e pass="password" \
-       -p 5223:5223 \
-       -v $HOME/simplex/config:/etc/opt/simplex:z \
-       -v $HOME/simplex/logs:/var/opt/simplex:z \
-       simplexchat/simplexmq
-   ```
+2. Run your Docker container.
 
-#### Ubuntu
+   - `smp-server`
+   
+     You must change **your_ip_or_domain**. `-e "pass=password"` is optional variable to password-protect your `smp` server:
+     ```sh
+     docker run -d \
+         -e "ADDR=your_ip_or_domain" \
+         -e "PASS=password" \
+         -p 5223:5223 \
+         -v $HOME/simplex/smp/config:/etc/opt/simplex:z \
+         -v $HOME/simplex/smp/logs:/var/opt/simplex:z \
+         simplexchat/smp-server:latest
+     ```
 
-For Ubuntu you can download a binary from [the latest release](https://github.com/simplex-chat/simplexmq/releases).
+   - `xftp-server`
+   
+     You must change **your_ip_or_domain** and **maximum_storage**.
+     ```sh
+     docker run -d \
+         -e "ADDR=your_ip_or_domain" \
+         -e "QUOTA=maximum_storage" \
+         -p 443:443 \
+         -v $HOME/simplex/xftp/config:/etc/opt/simplex-xftp:z \
+         -v $HOME/simplex/xftp/logs:/var/opt/simplex-xftp:z \
+         -v $HOME/simplex/xftp/files:/srv/xftp:z \
+         simplexchat/xftp-server:latest
+     ```
+
+#### Using installation script
+
+**Please note** that currently, only Ubuntu distribution is supported.
+
+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 'b8cf2be103f21f9461d9a500bcd3db06ab7d01d68871b07f4bd245195cbead1d 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
 
@@ -136,31 +161,50 @@ For Ubuntu you can download a binary from [the latest release](https://github.co
 
 On Linux, you can build smp server using Docker.
 
-1. Build your `smp-server` image:
+1. Build your images:
 
    ```sh
    git clone https://github.com/simplex-chat/simplexmq
    cd simplexmq
    git checkout stable
-   DOCKER_BUILDKIT=1 docker build -t smp-server -f ./build.Dockerfile .
+   DOCKER_BUILDKIT=1 docker build -t local/smp-server --build-arg APP="smp-server" --build-arg APP_PORT="5223" . # For xmp-server
+   DOCKER_BUILDKIT=1 docker build -t local/xftp-server --build-arg APP="xftp-server" --build-arg APP_PORT="443" . # For xftp-server
    ```
 
-2. Create `config` and `logs` directories:
+2. Create directories for persistent Docker configuration:
 
    ```sh
-   mkdir -p ~/simplex/{config,logs}
+   mkdir -p $HOME/simplex/{xftp,smp}/{config,logs} && mkdir -p $HOME/simplex/xftp/files
    ```
 
-3. Run your Docker container. You must change **your_ip_or_domain**. `-e pass="password"` is optional variable to password-protect your `smp` server::
-   ```sh
-   docker run -d \
-       -e addr="your_ip_or_domain" \
-       -e pass="password" \
-       -p 5223:5223 \
-       -v $HOME/simplex/config:/etc/opt/simplex:z \
-       -v $HOME/simplex/logs:/var/opt/simplex:z \
-       smp-server
-   ```
+3. Run your Docker container.
+
+   - `smp-server`
+   
+     You must change **your_ip_or_domain**. `-e "pass=password"` is optional variable to password-protect your `smp` server:
+     ```sh
+     docker run -d \
+         -e "ADDR=your_ip_or_domain" \
+         -e "PASS=password" \
+         -p 5223:5223 \
+         -v $HOME/simplex/smp/config:/etc/opt/simplex:z \
+         -v $HOME/simplex/smp/logs:/var/opt/simplex:z \
+         simplexchat/smp-server:latest
+     ```
+
+   - `xftp-server`
+   
+     You must change **your_ip_or_domain** and **maximum_storage**.
+     ```sh
+     docker run -d \
+         -e "ADDR=your_ip_or_domain" \
+         -e "QUOTA=maximum_storage" \
+         -p 443:443 \
+         -v $HOME/simplex/xftp/config:/etc/opt/simplex-xftp:z \
+         -v $HOME/simplex/xftp/logs:/var/opt/simplex-xftp:z \
+         -v $HOME/simplex/xftp/files:/srv/xftp:z \
+         simplexchat/xftp-server:latest
+     ```
 
 #### Using your distribution
 

apps/smp-agent/Main.hs

@@ -1,5 +1,4 @@
 {-# LANGUAGE DuplicateRecordFields #-}
-{-# LANGUAGE NumericUnderscores #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE TypeApplications #-}
 
@@ -7,19 +6,28 @@ module Main where
 
 import Control.Logger.Simple
 import qualified Data.List.NonEmpty as L
+import qualified Data.Map.Strict as M
 import Simplex.Messaging.Agent.Env.SQLite
 import Simplex.Messaging.Agent.Server (runSMPAgent)
+import Simplex.Messaging.Agent.Store.SQLite (MigrationConfirmation (..))
 import Simplex.Messaging.Client (defaultNetworkConfig)
 import Simplex.Messaging.Transport (TLS, Transport (..))
 
 cfg :: AgentConfig
 cfg = defaultAgentConfig
 
+agentDbFile :: String
+agentDbFile = "smp-agent.db"
+
+agentDbKey :: String
+agentDbKey = ""
+
 servers :: InitialAgentServers
 servers =
   InitialAgentServers
-    { smp = L.fromList ["smp://bU0K-bRg24xWW__lS0umO1Zdw_SXqpJNtm1_RrPLViE=@localhost:5223"],
+    { smp = M.fromList [(1, L.fromList ["smp://bU0K-bRg24xWW__lS0umO1Zdw_SXqpJNtm1_RrPLViE=@localhost:5223"])],
       ntf = [],
+      xftp = M.empty,
       netCfg = defaultNetworkConfig
     }
 
@@ -30,4 +38,5 @@ main :: IO ()
 main = do
   putStrLn $ "SMP agent listening on port " ++ tcpPort (cfg :: AgentConfig)
   setLogLevel LogInfo -- LogError
-  withGlobalLogging logCfg $ runSMPAgent (transport @TLS) cfg servers
+  Right st <- createAgentStore agentDbFile agentDbKey MCConsole
+  withGlobalLogging logCfg $ runSMPAgent (transport @TLS) cfg servers st

apps/xftp-server/Main.hs

@@ -0,0 +1,18 @@
+module Main where
+
+import Control.Logger.Simple
+import Simplex.FileTransfer.Server.Main
+
+cfgPath :: FilePath
+cfgPath = "/etc/opt/simplex-xftp"
+
+logPath :: FilePath
+logPath = "/var/opt/simplex-xftp"
+
+logCfg :: LogConfig
+logCfg = LogConfig {lc_file = Nothing, lc_stderr = True}
+
+main :: IO ()
+main = do
+  setLogLevel LogDebug -- change to LogError in production
+  withGlobalLogging logCfg $ xftpServerCLI cfgPath logPath

apps/xftp/Main.hs

@@ -0,0 +1,6 @@
+module Main where
+
+import Simplex.FileTransfer.Client.Main
+
+main :: IO ()
+main = xftpClientCLI

build.Dockerfile

@@ -1,51 +0,0 @@
-FROM ubuntu:focal AS final
-FROM ubuntu:focal AS build
-
-### Build stage
-
-# Install curl and git and smp-related dependencies
-RUN apt-get update && apt-get install -y curl git build-essential libgmp3-dev zlib1g-dev
-
-# Install ghcup
-RUN curl https://downloads.haskell.org/~ghcup/x86_64-linux-ghcup -o /usr/bin/ghcup && \
-    chmod +x /usr/bin/ghcup
-
-# Install ghc
-RUN ghcup install ghc 8.10.7
-# Install cabal
-RUN ghcup install cabal
-# Set both as default
-RUN ghcup set ghc 8.10.7 && \
-    ghcup set cabal
-
-COPY . /project
-WORKDIR /project
-
-# Adjust PATH
-ENV PATH="/root/.cabal/bin:/root/.ghcup/bin:$PATH"
-
-# Compile smp-server
-RUN cabal update
-RUN cabal install
-
-### Final stage
-
-FROM final
-
-# Install OpenSSL dependency
-RUN apt-get update && apt-get install -y openssl
-
-# Copy compiled smp-server from build stage
-COPY --from=build /root/.cabal/bin/smp-server /usr/bin/smp-server
-
-# Copy our helper script
-COPY ./scripts/docker/entrypoint /usr/bin/entrypoint
-
-# Open smp-server listening port
-EXPOSE 5223
-
-# SimpleX requires using SIGINT to correctly preserve undelivered messages and restore them on restart
-STOPSIGNAL SIGINT
-
-# Finally, execute helper script
-ENTRYPOINT [ "/usr/bin/entrypoint" ]

cabal.project

@@ -1,11 +1,23 @@
 packages: .
 -- packages: . ../direct-sqlcipher ../sqlcipher-simple
+-- packages: . ../hs-socks
+-- packages: . ../http2
 
 source-repository-package
     type: git
     location: https://github.com/simplex-chat/aeson.git
     tag: 3eb66f9a68f103b5f1489382aad89f5712a64db7
 
+source-repository-package
+    type: git
+    location: https://github.com/simplex-chat/hs-socks.git
+    tag: a30cc7a79a08d8108316094f8f2f82a0c5e1ac51
+
+source-repository-package
+    type: git
+    location: https://github.com/kazu-yamamoto/http2.git
+    tag: b5a1b7200cf5bc7044af34ba325284271f6dff25
+
 source-repository-package
     type: git
     location: https://github.com/simplex-chat/direct-sqlcipher.git

download.Dockerfile

@@ -1,20 +0,0 @@
-FROM ubuntu:focal
-
-# Install curl
-RUN apt-get update && apt-get install -y curl
-
-# Download latest smp-server release and assign executable permission
-RUN curl -L https://github.com/simplex-chat/simplexmq/releases/latest/download/smp-server-ubuntu-20_04-x86-64 -o /usr/bin/smp-server && \
-	chmod +x /usr/bin/smp-server
-
-# Copy our helper script
-COPY ./scripts/docker/entrypoint /usr/bin/entrypoint
-
-# Open smp-server listening port
-EXPOSE 5223
-
-# SimpleX requires using SIGINT to correctly preserve undelivered messages and restore them on restart
-STOPSIGNAL SIGINT
-
-# Finally, execute helper script
-ENTRYPOINT [ "/usr/bin/entrypoint" ]

install.sh

@@ -0,0 +1,144 @@
+#!/usr/bin/env sh
+set -eu
+
+# Links to scripts/configs
+bin="https://github.com/simplex-chat/simplexmq/releases/latest/download"
+bin_smp="$bin/smp-server-ubuntu-20_04-x86-64"
+bin_xftp="$bin/xftp-server-ubuntu-20_04-x86-64"
+
+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"
+scripts_update="$scripts/simplex-servers-update"
+scripts_uninstall="$scripts/simplex-servers-uninstall"
+scripts_stopscript="$scripts/simplex-servers-stopscript"
+
+# Default installation paths
+path_bin="/usr/local/bin"
+path_bin_smp="$path_bin/smp-server"
+path_bin_xftp="$path_bin/xftp-server"
+path_bin_update="$path_bin/simplex-servers-update"
+path_bin_uninstall="$path_bin/simplex-servers-uninstall"
+path_bin_stopscript="$path_bin/simplex-servers-stopscript"
+
+path_conf_etc="/etc/opt"
+path_conf_var="/var/opt"
+path_conf_smp="$path_conf_etc/simplex $path_conf_var/simplex"
+path_conf_xftp="$path_conf_etc/simplex-xftp $path_conf_var/simplex-xftp /srv/xftp"
+
+path_systemd="/etc/systemd/system"
+path_systemd_smp="$path_systemd/smp-server.service"
+path_systemd_xftp="$path_systemd/xftp-server.service"
+
+# Defaut users
+user_smp="smp"
+user_xftp="xftp"
+
+GRN='\033[0;32m'
+BLU='\033[1;34m'
+YLW='\033[1;33m'
+RED='\033[0;31m'
+NC='\033[0m'
+
+logo='
+ ____  _                 _     __  __
+/ ___|(_)_ __ ___  _ __ | | ___\ \/ /
+\___ \| | '"'"'_ ` _ \| '"'"'_ \| |/ _ \\  / 
+ ___) | | | | | | | |_) | |  __//  \ 
+|____/|_|_| |_| |_| .__/|_|\___/_/\_\
+                  |_|                            
+'
+
+welcome="Welcome to SMP/XFTP installation script! Here's what we're going to do:
+${GRN}1.${NC} Install latest binaries from GitHub releases:
+    - smp: ${YLW}${path_bin_smp}${NC}
+    - xftp: ${YLW}${path_bin_xftp}${NC}
+${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:
+    - xmp: ${YLW}${user_smp}${NC}
+    - xftp: ${YLW}${user_xftp}${NC}
+${GRN}4.${NC} Create systemd services:
+    - smp: ${YLW}${path_systemd_smp}${NC}
+    - xftp: ${YLW}${path_systemd_xftp}${NC}
+${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 or ${RED}Ctrl+C${NC} to cancel installation"
+
+end="Installtion is complete!
+
+Please checkout our server guides:
+- smp: ${GRN}https://simplex.chat/docs/server.html${NC}
+- xftp: ${GRN}https://simplex.chat/docs/xftp-server.html${NC}
+
+To uninstall with full clean-up, simply run: ${YLW}sudo /usr/local/bin/simplex-servers-uninstall${NC}
+"
+
+setup_bins() {
+ curl --proto '=https' --tlsv1.2 -sSf -L "$bin_smp" -o "$path_bin_smp" && chmod +x "$path_bin_smp"
+ curl --proto '=https' --tlsv1.2 -sSf -L "$bin_xftp" -o "$path_bin_xftp" && chmod +x "$path_bin_xftp"
+}
+
+setup_users() {
+ useradd -M "$user_smp" 2> /dev/null || true
+ useradd -M "$user_xftp" 2> /dev/null || true
+}
+
+setup_dirs() {
+ # Unquoted varibles, so field splitting can occur
+ mkdir -p $path_conf_smp
+ chown "$user_smp":"$user_smp" $path_conf_smp
+ mkdir -p $path_conf_xftp
+ chown "$user_xftp":"$user_xftp" $path_conf_xftp
+}
+
+setup_systemd() {
+ curl --proto '=https' --tlsv1.2 -sSf -L "$scripts_systemd_smp" -o "$path_systemd_smp"
+ curl --proto '=https' --tlsv1.2 -sSf -L "$scripts_systemd_xftp" -o "$path_systemd_xftp"
+}
+
+setup_scripts() {
+ curl --proto '=https' --tlsv1.2 -sSf -L "$scripts_update" -o "$path_bin_update" && chmod +x "$path_bin_update"
+ curl --proto '=https' --tlsv1.2 -sSf -L "$scripts_uninstall" -o "$path_bin_uninstall" && chmod +x "$path_bin_uninstall"
+ curl --proto '=https' --tlsv1.2 -sSf -L "$scripts_stopscript" -o "$path_bin_stopscript" && chmod +x "$path_bin_stopscript"
+ }
+
+checks() {
+ if [ "$(id -u)" -ne 0 ]; then
+  printf "This script is intended to be run with root privileges. Please re-run script using sudo."
+  exit 1
+ fi
+}
+
+main() {
+ checks
+ 
+ printf "%b\n%b\n" "${BLU}$logo${NC}" "$welcome"
+ read ans
+
+ printf "Installing binaries..."
+ setup_bins
+ printf "${GRN} Done!${NC}\n"
+
+ printf "Creating users..."
+ setup_users
+ printf "${GRN} Done!${NC}\n"
+ 
+ printf "Creating directories..."
+ setup_dirs
+ printf "${GRN} Done!${NC}\n"
+
+ printf "Creating systemd services..."
+ setup_systemd
+ printf "${GRN} Done!${NC}\n"
+
+ printf "Installing stopscript, update and uninstallation script..."
+ setup_scripts
+ printf "${GRN} Done!${NC}\n"
+
+ printf "%b" "$end"
+}
+
+main

package.yaml

@@ -1,5 +1,5 @@
 name: simplexmq
-version: 4.2.1
+version: 5.1.3
 synopsis: SimpleXMQ message broker
 description: |
   This package includes <./docs/Simplex-Messaging-Server.html server>,
@@ -42,9 +42,10 @@ dependencies:
   - directory == 1.3.*
   - filepath == 1.4.*
   - http-types == 0.12.*
-  - http2 == 3.0.*
+  - http2 == 4.1.*
   - generic-random >= 1.3 && < 1.5
   - ini == 0.4.1
+  - iproute == 1.7.*
   - iso8601-time == 0.1.*
   - memory == 0.15.*
   - mtl == 2.2.*
@@ -59,6 +60,7 @@ dependencies:
   - sqlcipher-simple == 0.4.*
   - stm == 2.5.*
   - template-haskell == 2.16.*
+  - temporary == 1.3.*
   - text == 1.2.*
   - time == 1.9.*
   - time-compat == 1.9.*
@@ -71,6 +73,7 @@ dependencies:
   - x509 == 1.7.*
   - x509-store == 1.6.*
   - x509-validation == 1.6.*
+  - yaml == 0.11.*
 
 flags:
   swift:
@@ -103,6 +106,14 @@ executables:
     ghc-options:
       - -threaded
 
+  xftp-server:
+    source-dirs: apps/xftp-server
+    main: Main.hs
+    dependencies:
+      - simplexmq
+    ghc-options:
+      - -threaded
+
   smp-agent:
     source-dirs: apps/smp-agent
     main: Main.hs
@@ -111,12 +122,21 @@ executables:
     ghc-options:
       - -threaded
 
+  xftp:
+    source-dirs: apps/xftp
+    main: Main.hs
+    dependencies:
+      - simplexmq
+    ghc-options:
+      - -threaded
+
 tests:
-  smp-server-test:
+  simplexmq-test:
     source-dirs: tests
     main: Test.hs
     dependencies:
       - simplexmq
+      - deepseq == 1.4.*
       - hspec == 2.7.*
       - hspec-core == 2.7.*
       - HUnit == 1.6.*

rfcs/2022-12-26-simplex-file-transfer.md

@@ -95,10 +95,12 @@ To send the file, the sender will:
 
 - compute SHA512 digest
 - pad the file to match the whole number of chunks in size,
-- encrypt it with a randomly chosen symmetric key and IV (e.g., using NaCL cryptobox),
+- encrypt it with a randomly chosen symmetric key and IV (e.g., using NaCL crypto_secretbox),
 - split into fixed size chunks
 - upload each chunk to a randomly chosen server.
 
+The sending client should generate more per-recipient keys than the actual number of recipients, possibly rounding up to a power of 2, to conceal the actual number of intended recipients.
+
 Then the sending client will combine addresses of all chunks and other information into "file description", different for each file recipient, that will include:
 
 - an encryption key that was used to encrypt the file (the same for all recipients).
@@ -106,37 +108,39 @@ Then the sending client will combine addresses of all chunks and other informati
 - list of chunk descriptions; information for each chunk:
   - private Ed25519 key to sign commands for file transfer server.
   - chunk address (server host and chunk ID).
+  - chunk sha512 digest
 
 To reduce the size, chunk descriptions will be grouped by the server host.
 
-This "file description" itself will be sent as a small file. To estimate its size:
+This "file description" itself will be sent as a small file over an authenticated channel, to prevent file description modification. To estimate its size:
 
 - each chunk \* redundancy per chunk, assuming chunks are grouped per server:
-  - chunk number in the file - 8 bytes (including any overhead)
+  - 1-based chunk number in the file - 8 bytes (including any overhead)
   - Ed25519 key (different for each recipient / chunk combination) - 32 bytes \* 4/3 (base64, assuming text encoding)
   - chunk ID (different for each recipient) - 64 bytes \* 4/3
+  - optional (only in the first chunk occurence) chunk sha512 digests - 64 bytes \* 4/3
 - server addresses - say, 128 bytes per server
 - sha512 digest - 64 bytes \* 4/3
 - encryption key - 32 bytes \* 4/3
 - IV - 32 bytes \* 4/3
 - encoding overhead - say, 256 bytes
 
-For 1gb file, sent via 4 different servers, in 8Mb chunks, with redundancy 2, the size of "file description", assuming text encoding, will be ~34kb (`128 * (8 + 32 + 64) * 2 * 4/3 + 128 * 4 + (64 + 32 + 32) * 4/3 + 256`).
+For 1gb file, sent via 4 different servers, in 8Mb chunks, with redundancy 2, the size of "file description", assuming text encoding, will be ~45kb (`128 * (8 + 32 + 64) * 2 * 4/3 + 128 * 64 * 4/3 + 128 * 4 + (64 + 32 + 32) * 4/3 + 256`).
 
 File description format (yml):
 
 ```
 name: file.ext
 size: 33200000
-chunk: 8Mb
+chunk: 8mb
 hash: abc=
 key: abc=
 iv: abc=
 parts:
   - server: xftp://abc=@example1.com
-    chunks: [1:abc=:def=, 3:abc=:def=]
+    chunks: [1:abc=:def=:ghi=, 3:abc=:def=:ghi=]
   - server: xftp://abc=@example2.com
-    chunks: [2:abc=:def=, 4:abc=:def=]
+    chunks: [2:abc=:def=:ghi=, 4:abc=:def=:ghi=:2mb]
   - server: xftp://abc=@example3.com
     chunks: [1:abc=:def=, 4:abc=:def=]
   - server: xftp://abc=@example4.com

scripts/docker/entrypoint

@@ -1,29 +0,0 @@
-#!/usr/bin/env sh
-confd="/etc/opt/simplex"
-logd="/var/opt/simplex/"
-
-# 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 ;;
-    *[a-zA-Z]*) set -- -n $addr ;;
-    *) set -- --ip $addr ;;
-  esac
-
-  case $pass in
-    '') set -- "$@" --no-password ;;
-    *) set -- "$@" --password $pass ;;
-  esac
-
-  smp-server init -y -l "$@"
-fi
-
-# backup store log
-[ -f "$logd/smp-server-store.log" ] && cp "$logd"/smp-server-store.log "$logd"/smp-server-store.log.bak
-# rotate server log
-[ -f "$logd/smp-server.log" ] && mv "$logd"/smp-server.log "$logd"/smp-server-"$(date +'%FT%T')".log
-
-# Finally, run smp-sever. Notice that "exec" here is important:
-# smp-server replaces our helper script, so that it can catch INT signal
-exec smp-server start > "$logd"/smp-server.log 2>&1

scripts/docker/entrypoint-smp-server

@@ -0,0 +1,48 @@
+#!/usr/bin/env sh
+confd='/etc/opt/simplex'
+logd='/var/opt/simplex/'
+
+# 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 $ADDR environment variable.\n'; exit 1 ;;
+    *[a-zA-Z]*)
+      case "${ADDR}" in
+        *:*) set -- --ip "${ADDR}" ;;
+        *) set -- -n "${ADDR}" ;;
+      esac
+      ;;
+    *) set -- --ip "${ADDR}" ;;
+  esac
+
+  # Optionally, set password
+  case "${PASS}" in
+    '') set -- "$@" --no-password ;;
+    *) set -- "$@" --password "${PASS}" ;;
+  esac
+
+  # And init certificates and configs
+  smp-server init -y -l "$@"
+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
+
+# 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

@@ -0,0 +1,48 @@
+#!/usr/bin/env sh
+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 $ADDR environment variable.\n'; exit 1 ;;
+    *[a-zA-Z]*)
+      case "${ADDR}" in
+        *:*) set -- --ip "${ADDR}" ;;
+        *) set -- -n "${ADDR}" ;;
+      esac
+      ;;
+    *) set -- --ip "${ADDR}" ;;
+  esac
+
+  # Set quota
+  case "${QUOTA}" in
+    '') printf 'Please specify $QUOTA environment variable.\n'; exit 1 ;;
+    *) set -- "$@" --quota "${QUOTA}" ;;
+  esac
+
+  # Init the certificates and configs
+  xftp-server init -l -p /srv/xftp "$@"
+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
+
+# 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

@@ -0,0 +1,30 @@
+#!/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"
+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}.${date:-date-failed}"
+ fi
+}
+
+backup_xftp() {
+ if [ -e "$path_conf_storelog_xftp" ]; then
+  cp "$path_conf_storelog_xftp" "${path_conf_storelog_xftp}.${date:-date-failed}"
+ fi
+}
+
+if [ "$1" = 'smp-server' ]; then
+ backup_smp
+elif [ "$1" = 'xftp-server' ]; then
+ backup_xftp
+else
+ backup_smp
+ backup_xftp
+fi

scripts/main/simplex-servers-uninstall

@@ -0,0 +1,23 @@
+#!/usr/bin/env sh
+set -eu
+
+GRN='\033[0;32m'
+RED='\033[0;31m'
+NC='\033[0m'
+
+if [ "$(id -u)" -ne 0 ]; then
+  printf "This script is intended to be run with root privileges. Please re-run script using sudo."
+  exit 1
+fi
+
+printf "${RED}This action will permanently remove all configs, directories, binaries from Installation Script. Please backup any relevant configs if they are needed.${NC}\n\nPress ${GRN}ENTER${NC} to continue or ${RED}Ctrl+C${NC} to cancel installation"
+read ans
+
+systemctl stop smp-server
+systemctl stop xftp-server
+
+rm -rf /var/opt/simplex /etc/opt/simplex /var/opt/simplex-xftp /etc/opt/simplex-xftp /srv/xftp /etc/systemd/system/smp-server.service /etc/systemd/system/xftp-server.service /usr/local/bin/smp-server /usr/local/bin/xftp-server /usr/local/bin/simplex-servers-update /usr/local/bin/simplex-servers-uninstall
+
+userdel smp && userdel xftp
+
+printf "Uninstallation is complete! Thanks for trying out SimpleX!\n"

scripts/main/simplex-servers-update

@@ -0,0 +1,174 @@
+#!/usr/bin/env sh
+set -eu
+
+# Links to scripts/configs
+bin="https://github.com/simplex-chat/simplexmq/releases/latest/download"
+bin_smp="$bin/smp-server-ubuntu-20_04-x86-64"
+bin_xftp="$bin/xftp-server-ubuntu-20_04-x86-64"
+
+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"
+scripts_update="$scripts/simplex-servers-update"
+scripts_uninstall="$scripts/simplex-servers-uninstall"
+scripts_stopscript="$scripts/simplex-servers-stopscript"
+
+# Default installation paths
+path_bin="/usr/local/bin"
+path_bin_smp="$path_bin/smp-server"
+path_bin_xftp="$path_bin/xftp-server"
+path_bin_update="$path_bin/simplex-servers-update"
+path_bin_uninstall="$path_bin/simplex-servers-uninstall"
+path_bin_stopscript="$path_bin/simplex-servers-stopscript"
+
+path_systemd="/etc/systemd/system"
+path_systemd_smp="$path_systemd/smp-server.service"
+path_systemd_xftp="$path_systemd/xftp-server.service"
+
+# Temporary paths
+path_tmp_bin="$(mktemp -d)"
+path_tmp_bin_update="$path_tmp_bin/simplex-servers-update"
+path_tmp_bin_uninstall="$path_tmp_bin/simplex-servers-uninstall"
+path_tmp_bin_stopscript="$path_tmp_bin/simplex-servers-stopscript"
+path_tmp_systemd_smp="$path_tmp_bin/smp-server.service"
+path_tmp_systemd_xftp="$path_tmp_bin/xftp-server.service"
+
+GRN='\033[0;32m'
+BLU='\033[1;36m'
+YLW='\033[1;33m'
+RED='\033[0;31m'
+NC='\033[0m'
+
+# Currently, XFTP default to v0.1.0, so it doesn't make sense to check its version
+local_version="$($path_bin_smp -v | awk '{print $3}')"
+remote_version="$(curl --proto '=https' --tlsv1.2 -sSf -L https://api.github.com/repos/simplex-chat/simplexmq/releases/latest | grep -i "tag_name" | awk -F \" '{print $4}')"
+
+update_scripts() {
+  curl --proto '=https' --tlsv1.2 -sSf -L "$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 "$path_tmp_bin_uninstall"
+  curl --proto '=https' --tlsv1.2 -sSf -L "$scripts_stopscript" -o "$path_tmp_bin_stopscript" && chmod +x "$path_tmp_bin_stopscript"
+
+  if diff -q "$path_bin_uninstall" "$path_tmp_bin_uninstall" > /dev/null 2>&1; then
+    printf -- "- ${YLW}Uninstall script is up-to-date${NC}.\n"
+    rm "$path_tmp_bin_uninstall"
+  else
+    printf -- "- Updating uninstall script..."
+    mv "$path_tmp_bin_uninstall" "$path_bin_uninstall"
+    printf "${GRN}Done!${NC}\n"
+  fi
+  if diff -q "$path_bin_stopscript" "$path_tmp_bin_stopscript" > /dev/null 2>&1; then
+    printf -- "- ${YLW}Stopscript script is up-to-date${NC}.\n"
+    rm "$path_tmp_bin_stopscript"
+  else
+    printf -- "- Updating stopscript script..."
+    mv "$path_tmp_bin_stopscript" "$path_bin_stopscript"
+    printf "${GRN}Done!${NC}\n"
+  fi
+  if diff -q "$path_bin_update" "$path_tmp_bin_update" > /dev/null 2>&1; then
+    printf -- "- ${YLW}Update script is up-to-date${NC}.\n"
+    rm "$path_tmp_bin_update"
+  else
+    printf -- "- Updating update script..."
+    mv "$path_tmp_bin_update" "$path_bin_update"
+    printf "${GRN}Done!${NC}\n"
+    printf "Re-executing Update script with latest updates..."
+    exec sh "$path_bin_update" "continue"
+  fi
+}
+
+update_systemd() {
+  curl --proto '=https' --tlsv1.2 -sSf -L "$scripts_systemd_smp" -o "$path_tmp_systemd_smp"
+  curl --proto '=https' --tlsv1.2 -sSf -L "$scripts_systemd_xftp" -o "$path_tmp_systemd_xftp"
+
+  if diff -q "$path_systemd_smp" "$path_tmp_systemd_smp" > /dev/null 2>&1; then
+    printf -- "- ${YLW}smp-server service is up-to-date${NC}.\n"
+    rm "$path_tmp_systemd_smp"
+  else
+    printf -- "- Updating smp-server service..."
+    mv "$path_tmp_systemd_smp" "$path_systemd_smp"
+    systemctl daemon-reload
+    printf "${GRN}Done!${NC}\n"
+  fi
+  if diff -q "$path_systemd_xftp" "$path_tmp_systemd_xftp" > /dev/null 2>&1; then
+    printf -- "- ${YLW}xftp-server service is up-to-date${NC}.\n"
+    rm "$path_tmp_systemd_xftp"
+  else
+    printf -- "- Updating xftp-server service..."
+    mv "$path_tmp_systemd_xftp" "$path_systemd_xftp"
+    systemctl daemon-reload
+    printf "${GRN}Done!${NC}\n"
+  fi
+}
+
+update_bins() {
+  if [ "$local_version" != "$remote_version" ]; then
+    if systemctl is-active --quiet smp-server; then
+      printf -- "- Stopping smp-server service..."
+      systemctl stop smp-server
+      printf "${GRN}Done!${NC}\n"
+
+      printf -- "- Updating smp-server bin to %s..." "$remote_version"
+      curl --proto '=https' --tlsv1.2 -sSf -L "$bin_smp" -o "$path_bin_smp" && chmod +x "$path_bin_smp"
+      printf "${GRN}Done!${NC}\n"
+      
+      printf -- "- Starting smp-server service..."
+      systemctl start smp-server
+      printf "${GRN}Done!${NC}\n"
+    else
+      printf -- "- Updating smp-server bin..."
+      curl --proto '=https' --tlsv1.2 -sSf -L "$bin_smp" -o "$path_bin_smp" && chmod +x "$path_bin_smp"
+      printf "${GRN}Done!${NC}\n"
+    fi
+
+    if systemctl is-active --quiet xftp-server; then
+      printf -- "- Stopping xftp-server service..."
+      systemctl stop xftp-server
+      printf "${GRN}Done!${NC}\n"
+
+      printf -- "- Updating xftp-server bin to %s..." "$remote_version"
+      curl --proto '=https' --tlsv1.2 -sSf -L "$bin_xftp" -o "$path_bin_xftp" && chmod +x "$path_bin_xftp"
+      printf "${GRN}Done!${NC}\n"
+      
+      printf -- "- Starting xftp-server service..."
+      systemctl start xftp-server
+      printf "${GRN}Done!${NC}\n"
+    else
+      printf -- "- Updating xftp-server bin..."
+      curl --proto '=https' --tlsv1.2 -sSf -L "$bin_smp" -o "$path_bin_xftp" && chmod +x "$path_bin_xftp"
+      printf "${GRN}Done!${NC}\n"
+    fi
+  else
+    printf -- "- ${YLW}smp-server and xftp-server binaries is up-to-date${NC}.\n"
+  fi
+}
+
+checks() {
+  if [ "$(id -u)" -ne 0 ]; then
+    printf "This script is intended to be run with root privileges. Please re-run script using sudo.\n"
+    exit 1
+  fi
+}
+
+main() {
+  checks
+
+  set +u
+  if [ "$1" != "continue" ]; then
+    set -u
+    printf "Updating scripts...\n"
+    update_scripts
+  else
+    set -u
+    printf "${GRN}Done!${NC}\n"
+  fi
+
+  printf "Updating systemd services...\n"
+  update_systemd
+  
+  printf "Updating simplex server binaries...\n"
+  update_bins
+
+  rm -rf "$path_tmp_bin"
+}
+
+main "$@"

scripts/main/smp-server.service

@@ -0,0 +1,15 @@
+[Unit]
+Description=SMP server
+
+[Service]
+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
+TimeoutStopSec=infinity
+
+[Install]
+WantedBy=multi-user.target

scripts/main/xftp-server.service

@@ -0,0 +1,16 @@
+[Unit]
+Description=XFTP server
+
+[Service]
+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
+TimeoutStopSec=infinity
+AmbientCapabilities=CAP_NET_BIND_SERVICE
+   
+[Install]
+WantedBy=multi-user.target

simplexmq.cabal

@@ -1,11 +1,11 @@
 cabal-version: 1.12
 
--- This file has been generated from package.yaml by hpack version 0.35.0.
+-- This file has been generated from package.yaml by hpack version 0.35.1.
 --
 -- see: https://github.com/sol/hpack
 
 name:           simplexmq
-version:        4.2.1
+version:        5.1.3
 synopsis:       SimpleXMQ message broker
 description:    This package includes <./docs/Simplex-Messaging-Server.html server>,
                 <./docs/Simplex-Messaging-Client.html client> and
@@ -34,6 +34,24 @@ flag swift
 
 library
   exposed-modules:
+      Simplex.FileTransfer
+      Simplex.FileTransfer.Agent
+      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.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
       Simplex.Messaging.Agent
       Simplex.Messaging.Agent.Client
       Simplex.Messaging.Agent.Env.SQLite
@@ -55,10 +73,22 @@ library
       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.TAsyncs
       Simplex.Messaging.Agent.TRcvQueues
       Simplex.Messaging.Client
       Simplex.Messaging.Client.Agent
       Simplex.Messaging.Crypto
+      Simplex.Messaging.Crypto.Lazy
       Simplex.Messaging.Crypto.Ratchet
       Simplex.Messaging.Encoding
       Simplex.Messaging.Encoding.String
@@ -88,6 +118,7 @@ library
       Simplex.Messaging.Server.StoreLog
       Simplex.Messaging.TMap
       Simplex.Messaging.Transport
+      Simplex.Messaging.Transport.Buffer
       Simplex.Messaging.Transport.Client
       Simplex.Messaging.Transport.HTTP2
       Simplex.Messaging.Transport.HTTP2.Client
@@ -125,8 +156,9 @@ library
     , filepath ==1.4.*
     , generic-random >=1.3 && <1.5
     , http-types ==0.12.*
-    , http2 ==3.0.*
+    , http2 ==4.1.*
     , ini ==0.4.1
+    , iproute ==1.7.*
     , iso8601-time ==0.1.*
     , memory ==0.15.*
     , mtl ==2.2.*
@@ -140,6 +172,7 @@ library
     , sqlcipher-simple ==0.4.*
     , stm ==2.5.*
     , template-haskell ==2.16.*
+    , temporary ==1.3.*
     , text ==1.2.*
     , time ==1.9.*
     , time-compat ==1.9.*
@@ -152,6 +185,7 @@ library
     , x509 ==1.7.*
     , x509-store ==1.6.*
     , x509-validation ==1.6.*
+    , yaml ==0.11.*
   default-language: Haskell2010
   if flag(swift)
     cpp-options: -DswiftJSON
@@ -186,8 +220,9 @@ executable ntf-server
     , filepath ==1.4.*
     , generic-random >=1.3 && <1.5
     , http-types ==0.12.*
-    , http2 ==3.0.*
+    , http2 ==4.1.*
     , ini ==0.4.1
+    , iproute ==1.7.*
     , iso8601-time ==0.1.*
     , memory ==0.15.*
     , mtl ==2.2.*
@@ -202,6 +237,7 @@ executable ntf-server
     , sqlcipher-simple ==0.4.*
     , stm ==2.5.*
     , template-haskell ==2.16.*
+    , temporary ==1.3.*
     , text ==1.2.*
     , time ==1.9.*
     , time-compat ==1.9.*
@@ -214,6 +250,7 @@ executable ntf-server
     , x509 ==1.7.*
     , x509-store ==1.6.*
     , x509-validation ==1.6.*
+    , yaml ==0.11.*
   default-language: Haskell2010
   if flag(swift)
     cpp-options: -DswiftJSON
@@ -248,8 +285,9 @@ executable smp-agent
     , filepath ==1.4.*
     , generic-random >=1.3 && <1.5
     , http-types ==0.12.*
-    , http2 ==3.0.*
+    , http2 ==4.1.*
     , ini ==0.4.1
+    , iproute ==1.7.*
     , iso8601-time ==0.1.*
     , memory ==0.15.*
     , mtl ==2.2.*
@@ -264,6 +302,7 @@ executable smp-agent
     , sqlcipher-simple ==0.4.*
     , stm ==2.5.*
     , template-haskell ==2.16.*
+    , temporary ==1.3.*
     , text ==1.2.*
     , time ==1.9.*
     , time-compat ==1.9.*
@@ -276,6 +315,7 @@ executable smp-agent
     , x509 ==1.7.*
     , x509-store ==1.6.*
     , x509-validation ==1.6.*
+    , yaml ==0.11.*
   default-language: Haskell2010
   if flag(swift)
     cpp-options: -DswiftJSON
@@ -310,8 +350,9 @@ executable smp-server
     , filepath ==1.4.*
     , generic-random >=1.3 && <1.5
     , http-types ==0.12.*
-    , http2 ==3.0.*
+    , http2 ==4.1.*
     , ini ==0.4.1
+    , iproute ==1.7.*
     , iso8601-time ==0.1.*
     , memory ==0.15.*
     , mtl ==2.2.*
@@ -326,6 +367,7 @@ executable smp-server
     , sqlcipher-simple ==0.4.*
     , stm ==2.5.*
     , template-haskell ==2.16.*
+    , temporary ==1.3.*
     , text ==1.2.*
     , time ==1.9.*
     , time-compat ==1.9.*
@@ -338,11 +380,142 @@ executable smp-server
     , x509 ==1.7.*
     , x509-store ==1.6.*
     , x509-validation ==1.6.*
+    , yaml ==0.11.*
   default-language: Haskell2010
   if flag(swift)
     cpp-options: -DswiftJSON
 
-test-suite smp-server-test
+executable xftp
+  main-is: Main.hs
+  other-modules:
+      Paths_simplexmq
+  hs-source-dirs:
+      apps/xftp
+  ghc-options: -Wall -Wcompat -Werror=incomplete-patterns -Wredundant-constraints -Wincomplete-record-updates -Wincomplete-uni-patterns -Wunused-type-patterns -threaded
+  build-depends:
+      QuickCheck ==2.14.*
+    , aeson ==2.0.*
+    , 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
+    , bytestring ==0.10.*
+    , case-insensitive ==1.2.*
+    , composition ==1.0.*
+    , constraints >=0.12 && <0.14
+    , containers ==0.6.*
+    , cryptonite >=0.27 && <0.30
+    , cryptostore ==0.2.*
+    , data-default ==0.7.*
+    , direct-sqlcipher ==2.3.*
+    , directory ==1.3.*
+    , filepath ==1.4.*
+    , generic-random >=1.3 && <1.5
+    , http-types ==0.12.*
+    , http2 ==4.1.*
+    , ini ==0.4.1
+    , iproute ==1.7.*
+    , iso8601-time ==0.1.*
+    , memory ==0.15.*
+    , mtl ==2.2.*
+    , network >=3.1.2.7 && <3.2
+    , network-transport ==0.5.4
+    , optparse-applicative >=0.15 && <0.17
+    , process ==1.6.*
+    , random >=1.1 && <1.3
+    , simple-logger ==0.1.*
+    , simplexmq
+    , socks ==0.6.*
+    , sqlcipher-simple ==0.4.*
+    , stm ==2.5.*
+    , template-haskell ==2.16.*
+    , temporary ==1.3.*
+    , text ==1.2.*
+    , time ==1.9.*
+    , time-compat ==1.9.*
+    , time-manager ==0.0.*
+    , tls >=1.6.0 && <1.7
+    , transformers ==0.5.*
+    , unliftio ==0.2.*
+    , unliftio-core ==0.2.*
+    , websockets ==0.12.*
+    , x509 ==1.7.*
+    , x509-store ==1.6.*
+    , x509-validation ==1.6.*
+    , yaml ==0.11.*
+  default-language: Haskell2010
+  if flag(swift)
+    cpp-options: -DswiftJSON
+
+executable xftp-server
+  main-is: Main.hs
+  other-modules:
+      Paths_simplexmq
+  hs-source-dirs:
+      apps/xftp-server
+  ghc-options: -Wall -Wcompat -Werror=incomplete-patterns -Wredundant-constraints -Wincomplete-record-updates -Wincomplete-uni-patterns -Wunused-type-patterns -threaded
+  build-depends:
+      QuickCheck ==2.14.*
+    , aeson ==2.0.*
+    , 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
+    , bytestring ==0.10.*
+    , case-insensitive ==1.2.*
+    , composition ==1.0.*
+    , constraints >=0.12 && <0.14
+    , containers ==0.6.*
+    , cryptonite >=0.27 && <0.30
+    , cryptostore ==0.2.*
+    , data-default ==0.7.*
+    , direct-sqlcipher ==2.3.*
+    , directory ==1.3.*
+    , filepath ==1.4.*
+    , generic-random >=1.3 && <1.5
+    , http-types ==0.12.*
+    , http2 ==4.1.*
+    , ini ==0.4.1
+    , iproute ==1.7.*
+    , iso8601-time ==0.1.*
+    , memory ==0.15.*
+    , mtl ==2.2.*
+    , network >=3.1.2.7 && <3.2
+    , network-transport ==0.5.4
+    , optparse-applicative >=0.15 && <0.17
+    , process ==1.6.*
+    , random >=1.1 && <1.3
+    , simple-logger ==0.1.*
+    , simplexmq
+    , socks ==0.6.*
+    , sqlcipher-simple ==0.4.*
+    , stm ==2.5.*
+    , template-haskell ==2.16.*
+    , temporary ==1.3.*
+    , text ==1.2.*
+    , time ==1.9.*
+    , time-compat ==1.9.*
+    , time-manager ==0.0.*
+    , tls >=1.6.0 && <1.7
+    , transformers ==0.5.*
+    , unliftio ==0.2.*
+    , unliftio-core ==0.2.*
+    , websockets ==0.12.*
+    , x509 ==1.7.*
+    , x509-store ==1.6.*
+    , x509-validation ==1.6.*
+    , yaml ==0.11.*
+  default-language: Haskell2010
+  if flag(swift)
+    cpp-options: -DswiftJSON
+
+test-suite simplexmq-test
   type: exitcode-stdio-1.0
   main-is: Test.hs
   other-modules:
@@ -350,6 +523,7 @@ test-suite smp-server-test
       AgentTests.ConnectionRequestTests
       AgentTests.DoubleRatchetTests
       AgentTests.FunctionalAPITests
+      AgentTests.MigrationTests
       AgentTests.NotificationTests
       AgentTests.SchemaDump
       AgentTests.SQLiteTests
@@ -359,11 +533,16 @@ test-suite smp-server-test
       CoreTests.ProtocolErrorTests
       CoreTests.RetryIntervalTests
       CoreTests.VersionRangeTests
+      FileDescriptionTests
       NtfClient
       NtfServerTests
       ServerTests
       SMPAgentClient
       SMPClient
+      XFTPAgent
+      XFTPCLI
+      XFTPClient
+      XFTPServerTests
       Paths_simplexmq
   hs-source-dirs:
       tests
@@ -387,6 +566,7 @@ test-suite smp-server-test
     , cryptonite >=0.27 && <0.30
     , cryptostore ==0.2.*
     , data-default ==0.7.*
+    , deepseq ==1.4.*
     , direct-sqlcipher ==2.3.*
     , directory ==1.3.*
     , filepath ==1.4.*
@@ -394,8 +574,9 @@ test-suite smp-server-test
     , hspec ==2.7.*
     , hspec-core ==2.7.*
     , http-types ==0.12.*
-    , http2 ==3.0.*
+    , http2 ==4.1.*
     , ini ==0.4.1
+    , iproute ==1.7.*
     , iso8601-time ==0.1.*
     , main-tester ==0.2.*
     , memory ==0.15.*
@@ -412,6 +593,7 @@ test-suite smp-server-test
     , sqlcipher-simple ==0.4.*
     , stm ==2.5.*
     , template-haskell ==2.16.*
+    , temporary ==1.3.*
     , text ==1.2.*
     , time ==1.9.*
     , time-compat ==1.9.*
@@ -425,6 +607,7 @@ test-suite smp-server-test
     , x509 ==1.7.*
     , x509-store ==1.6.*
     , x509-validation ==1.6.*
+    , yaml ==0.11.*
   default-language: Haskell2010
   if flag(swift)
     cpp-options: -DswiftJSON

src/Simplex/FileTransfer.hs

@@ -0,0 +1,14 @@
+module Simplex.FileTransfer where
+
+-- TODO
+-- Protocol
+-- Store (in memory storage)
+-- StoreLog (append only log)
+-- FileDescription
+-- Server
+-- Client
+-- Server/Main (server CLI)
+-- Client/Main (client CLI)
+--
+-- Transport for HTTP2 ?
+-- streaming Crypto

src/Simplex/FileTransfer/Agent.hs

@@ -0,0 +1,646 @@
+{-# LANGUAGE ConstraintKinds #-}
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE RankNTypes #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE TupleSections #-}
+{-# LANGUAGE TypeApplications #-}
+
+module Simplex.FileTransfer.Agent
+  ( startWorkers,
+    closeXFTPAgent,
+    toFSFilePath,
+    -- Receiving files
+    receiveFile,
+    deleteRcvFile,
+    -- Sending files
+    sendFileExperimental,
+    sendFile,
+    deleteSndFileInternal,
+    deleteSndFileRemote,
+  )
+where
+
+import Control.Concurrent.STM (stateTVar)
+import Control.Logger.Simple (logError)
+import Control.Monad
+import Control.Monad.Except
+import Control.Monad.Reader
+import Crypto.Random (ChaChaDRG, randomBytesGenerate)
+import Data.Bifunctor (first)
+import Data.ByteString (ByteString)
+import qualified Data.ByteString.Base64.URL as U
+import qualified Data.ByteString.Char8 as B
+import qualified Data.ByteString.Lazy.Char8 as LB
+import Data.Composition ((.:))
+import Data.Int (Int64)
+import Data.List (foldl', isSuffixOf, partition, sortOn)
+import Data.List.NonEmpty (nonEmpty)
+import qualified Data.List.NonEmpty as L
+import Data.Map (Map)
+import qualified Data.Map.Strict as M
+import Data.Text (Text)
+import Data.Time.Clock (getCurrentTime)
+import Data.Time.Format (defaultTimeLocale, formatTime)
+import Simplex.FileTransfer.Client (XFTPChunkSpec (..))
+import Simplex.FileTransfer.Client.Main
+import Simplex.FileTransfer.Crypto
+import Simplex.FileTransfer.Description
+import Simplex.FileTransfer.Protocol (FileParty (..), FilePartyI, SFileParty (..))
+import Simplex.FileTransfer.Transport (XFTPRcvChunkSpec (..))
+import Simplex.FileTransfer.Types
+import Simplex.FileTransfer.Util (removePath, uniqueCombine)
+import Simplex.Messaging.Agent.Client
+import Simplex.Messaging.Agent.Env.SQLite
+import Simplex.Messaging.Agent.Protocol
+import Simplex.Messaging.Agent.RetryInterval
+import Simplex.Messaging.Agent.Store.SQLite
+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 (EntityId, XFTPServer, XFTPServerWithAuth)
+import Simplex.Messaging.TMap (TMap)
+import qualified Simplex.Messaging.TMap as TM
+import Simplex.Messaging.Util (liftError, liftIOEither, tshow, unlessM, whenM)
+import System.FilePath (takeFileName, (</>))
+import UnliftIO
+import UnliftIO.Concurrent
+import UnliftIO.Directory
+import qualified UnliftIO.Exception as E
+
+startWorkers :: AgentMonad m => AgentClient -> Maybe FilePath -> m ()
+startWorkers c workDir = do
+  wd <- asks $ xftpWorkDir . xftpAgent
+  atomically $ writeTVar wd workDir
+  startRcvFiles
+  startSndFiles
+  startDelFiles
+  where
+    startRcvFiles = do
+      rcvFilesTTL <- asks $ rcvFilesTTL . config
+      pendingRcvServers <- withStore' c (`getPendingRcvFilesServers` rcvFilesTTL)
+      forM_ pendingRcvServers $ \s -> addXFTPRcvWorker c (Just s)
+      -- start local worker for files pending decryption,
+      -- no need to make an extra query for the check
+      -- as the worker will check the store anyway
+      addXFTPRcvWorker c Nothing
+    startSndFiles = do
+      sndFilesTTL <- asks $ sndFilesTTL . config
+      -- start worker for files pending encryption/creation
+      addXFTPSndWorker c Nothing
+      pendingSndServers <- withStore' c (`getPendingSndFilesServers` sndFilesTTL)
+      forM_ pendingSndServers $ \s -> addXFTPSndWorker c (Just s)
+    startDelFiles = do
+      rcvFilesTTL <- asks $ rcvFilesTTL . config
+      pendingDelServers <- withStore' c (`getPendingDelFilesServers` rcvFilesTTL)
+      forM_ pendingDelServers $ addXFTPDelWorker c
+
+closeXFTPAgent :: MonadUnliftIO m => XFTPAgent -> m ()
+closeXFTPAgent XFTPAgent {xftpRcvWorkers, xftpSndWorkers} = do
+  stopWorkers xftpRcvWorkers
+  stopWorkers xftpSndWorkers
+  where
+    stopWorkers wsSel = do
+      ws <- atomically $ stateTVar wsSel (,M.empty)
+      mapM_ (uninterruptibleCancel . snd) ws
+
+receiveFile :: AgentMonad m => AgentClient -> UserId -> ValidFileDescription 'FRecipient -> m RcvFileId
+receiveFile c userId (ValidFileDescription fd@FileDescription {chunks}) = do
+  g <- asks idsDrg
+  prefixPath <- getPrefixPath "rcv.xftp"
+  createDirectory prefixPath
+  let relPrefixPath = takeFileName prefixPath
+      relTmpPath = relPrefixPath </> "xftp.encrypted"
+      relSavePath = relPrefixPath </> "xftp.decrypted"
+  createDirectory =<< toFSFilePath relTmpPath
+  createEmptyFile =<< toFSFilePath relSavePath
+  fId <- withStore c $ \db -> createRcvFile db g userId fd relPrefixPath relTmpPath relSavePath
+  forM_ chunks downloadChunk
+  pure fId
+  where
+    downloadChunk :: AgentMonad m => FileChunk -> m ()
+    downloadChunk FileChunk {replicas = (FileChunkReplica {server} : _)} = do
+      addXFTPRcvWorker c (Just server)
+    downloadChunk _ = throwError $ INTERNAL "no replicas"
+
+getPrefixPath :: AgentMonad m => String -> m FilePath
+getPrefixPath suffix = do
+  workPath <- getXFTPWorkPath
+  ts <- liftIO getCurrentTime
+  let isoTime = formatTime defaultTimeLocale "%Y%m%d_%H%M%S_%6q" ts
+  uniqueCombine workPath (isoTime <> "_" <> suffix)
+
+toFSFilePath :: AgentMonad m => FilePath -> m FilePath
+toFSFilePath f = (</> f) <$> getXFTPWorkPath
+
+createEmptyFile :: AgentMonad m => FilePath -> m ()
+createEmptyFile fPath = do
+  h <- openFile fPath AppendMode
+  liftIO $ B.hPut h "" >> hFlush h
+
+addXFTPRcvWorker :: AgentMonad m => AgentClient -> Maybe XFTPServer -> m ()
+addXFTPRcvWorker c = addWorker c xftpRcvWorkers runXFTPRcvWorker runXFTPRcvLocalWorker
+
+addWorker ::
+  AgentMonad m =>
+  AgentClient ->
+  (XFTPAgent -> TMap (Maybe XFTPServer) (TMVar (), Async ())) ->
+  (AgentClient -> XFTPServer -> TMVar () -> m ()) ->
+  (AgentClient -> TMVar () -> m ()) ->
+  Maybe XFTPServer ->
+  m ()
+addWorker c wsSel runWorker runWorkerNoSrv srv_ = do
+  ws <- asks $ wsSel . xftpAgent
+  atomically (TM.lookup srv_ ws) >>= \case
+    Nothing -> do
+      doWork <- newTMVarIO ()
+      let runWorker' = case srv_ of
+            Just srv -> runWorker c srv doWork
+            Nothing -> runWorkerNoSrv c doWork
+      worker <- async $ runWorker' `E.finally` atomically (TM.delete srv_ ws)
+      atomically $ TM.insert srv_ (doWork, worker) ws
+    Just (doWork, _) ->
+      void . atomically $ tryPutTMVar doWork ()
+
+runXFTPRcvWorker :: forall m. AgentMonad m => AgentClient -> XFTPServer -> TMVar () -> m ()
+runXFTPRcvWorker c srv doWork = do
+  forever $ do
+    void . atomically $ readTMVar doWork
+    atomically $ assertAgentForeground c
+    runXFTPOperation
+  where
+    noWorkToDo = void . atomically $ tryTakeTMVar doWork
+    runXFTPOperation :: m ()
+    runXFTPOperation = do
+      rcvFilesTTL <- asks (rcvFilesTTL . config)
+      nextChunk <- withStore' c $ \db -> getNextRcvChunkToDownload db srv rcvFilesTTL
+      case nextChunk of
+        Nothing -> noWorkToDo
+        Just RcvFileChunk {rcvFileId, rcvFileEntityId, fileTmpPath, replicas = []} -> rcvWorkerInternalError c rcvFileId rcvFileEntityId (Just fileTmpPath) "chunk has no replicas"
+        Just fc@RcvFileChunk {userId, rcvFileId, rcvFileEntityId, digest, fileTmpPath, replicas = replica@RcvFileChunkReplica {rcvChunkReplicaId, server, delay} : _} -> do
+          ri <- asks $ reconnectInterval . config
+          let ri' = maybe ri (\d -> ri {initialInterval = d, increaseAfter = 0}) delay
+          withRetryInterval ri' $ \delay' loop ->
+            downloadFileChunk fc replica
+              `catchError` \e -> retryOnError "XFTP rcv worker" (retryLoop loop e delay') (retryDone e) e
+          where
+            retryLoop loop e replicaDelay = do
+              flip catchError (\_ -> pure ()) $ do
+                notifyOnRetry <- asks (xftpNotifyErrsOnRetry . config)
+                when notifyOnRetry $ notify c rcvFileEntityId $ RFERR e
+                closeXFTPServerClient c userId server digest
+                withStore' c $ \db -> updateRcvChunkReplicaDelay db rcvChunkReplicaId replicaDelay
+              atomically $ assertAgentForeground c
+              loop
+            retryDone e = rcvWorkerInternalError c rcvFileId rcvFileEntityId (Just fileTmpPath) (show e)
+    downloadFileChunk :: RcvFileChunk -> RcvFileChunkReplica -> m ()
+    downloadFileChunk RcvFileChunk {userId, rcvFileId, rcvFileEntityId, rcvChunkId, chunkNo, chunkSize, digest, fileTmpPath} replica = do
+      fsFileTmpPath <- toFSFilePath fileTmpPath
+      chunkPath <- uniqueCombine fsFileTmpPath $ show chunkNo
+      let chunkSpec = XFTPRcvChunkSpec chunkPath (unFileSize chunkSize) (unFileDigest digest)
+          relChunkPath = fileTmpPath </> takeFileName chunkPath
+      agentXFTPDownloadChunk c userId digest replica chunkSpec
+      (complete, progress) <- withStore c $ \db -> runExceptT $ do
+        liftIO $ updateRcvFileChunkReceived db (rcvChunkReplicaId replica) rcvChunkId relChunkPath
+        RcvFile {size = FileSize total, chunks} <- ExceptT $ getRcvFile db rcvFileId
+        let rcvd = receivedSize chunks
+            complete = all chunkReceived chunks
+        liftIO . when complete $ updateRcvFileStatus db rcvFileId RFSReceived
+        pure (complete, RFPROG rcvd total)
+      notify c rcvFileEntityId progress
+      when complete $ addXFTPRcvWorker c Nothing
+      where
+        receivedSize :: [RcvFileChunk] -> Int64
+        receivedSize = foldl' (\sz ch -> sz + receivedChunkSize ch) 0
+        receivedChunkSize ch@RcvFileChunk {chunkSize = s}
+          | chunkReceived ch = fromIntegral (unFileSize s)
+          | otherwise = 0
+        chunkReceived RcvFileChunk {replicas} = any received replicas
+
+retryOnError :: AgentMonad m => Text -> m a -> m a -> AgentErrorType -> m a
+retryOnError name loop done e = do
+  logError $ name <> " error: " <> tshow e
+  if temporaryAgentError e
+    then loop
+    else done
+
+rcvWorkerInternalError :: AgentMonad m => AgentClient -> DBRcvFileId -> RcvFileId -> Maybe FilePath -> String -> m ()
+rcvWorkerInternalError c rcvFileId rcvFileEntityId tmpPath internalErrStr = do
+  forM_ tmpPath (removePath <=< toFSFilePath)
+  withStore' c $ \db -> updateRcvFileError db rcvFileId internalErrStr
+  notify c rcvFileEntityId $ RFERR $ INTERNAL internalErrStr
+
+runXFTPRcvLocalWorker :: forall m. AgentMonad m => AgentClient -> TMVar () -> m ()
+runXFTPRcvLocalWorker c doWork = do
+  forever $ do
+    void . atomically $ readTMVar doWork
+    atomically $ assertAgentForeground c
+    runXFTPOperation
+  where
+    runXFTPOperation :: m ()
+    runXFTPOperation = do
+      rcvFilesTTL <- asks (rcvFilesTTL . config)
+      nextFile <- withStore' c (`getNextRcvFileToDecrypt` rcvFilesTTL)
+      case nextFile of
+        Nothing -> noWorkToDo
+        Just f@RcvFile {rcvFileId, rcvFileEntityId, tmpPath} ->
+          decryptFile f `catchError` (rcvWorkerInternalError c rcvFileId rcvFileEntityId tmpPath . show)
+    noWorkToDo = void . atomically $ tryTakeTMVar doWork
+    decryptFile :: RcvFile -> m ()
+    decryptFile RcvFile {rcvFileId, rcvFileEntityId, key, nonce, tmpPath, savePath, status, chunks} = do
+      fsSavePath <- toFSFilePath savePath
+      when (status == RFSDecrypting) $
+        whenM (doesFileExist fsSavePath) (removeFile fsSavePath >> createEmptyFile fsSavePath)
+      withStore' c $ \db -> updateRcvFileStatus db rcvFileId RFSDecrypting
+      chunkPaths <- getChunkPaths chunks
+      encSize <- liftIO $ foldM (\s path -> (s +) . fromIntegral <$> getFileSize path) 0 chunkPaths
+      void $ liftError (INTERNAL . show) $ decryptChunks encSize chunkPaths key nonce $ \_ -> pure fsSavePath
+      notify c rcvFileEntityId $ RFDONE fsSavePath
+      forM_ tmpPath (removePath <=< toFSFilePath)
+      withStore' c (`updateRcvFileComplete` rcvFileId)
+      where
+        getChunkPaths :: [RcvFileChunk] -> m [FilePath]
+        getChunkPaths [] = pure []
+        getChunkPaths (RcvFileChunk {chunkTmpPath = Just path} : cs) = do
+          ps <- getChunkPaths cs
+          fsPath <- toFSFilePath path
+          pure $ fsPath : ps
+        getChunkPaths (RcvFileChunk {chunkTmpPath = Nothing} : _cs) =
+          throwError $ INTERNAL "no chunk path"
+
+deleteRcvFile :: AgentMonad m => AgentClient -> RcvFileId -> m ()
+deleteRcvFile c rcvFileEntityId = do
+  RcvFile {rcvFileId, prefixPath, status} <- withStore c $ \db -> getRcvFileByEntityId db rcvFileEntityId
+  if status == RFSComplete || status == RFSError
+    then do
+      removePath prefixPath
+      withStore' c (`deleteRcvFile'` rcvFileId)
+    else withStore' c (`updateRcvFileDeleted` rcvFileId)
+
+sendFileExperimental :: forall m. AgentMonad m => AgentClient -> UserId -> FilePath -> Int -> m SndFileId
+sendFileExperimental c@AgentClient {xftpServers} userId filePath numRecipients = do
+  g <- asks idsDrg
+  sndFileId <- liftIO $ randomId g 12
+  xftpSrvs <- atomically $ TM.lookup userId xftpServers
+  void $ forkIO $ sendCLI sndFileId $ maybe [] L.toList xftpSrvs
+  pure sndFileId
+  where
+    randomId :: TVar ChaChaDRG -> Int -> IO ByteString
+    randomId gVar n = U.encode <$> (atomically . stateTVar gVar $ randomBytesGenerate n)
+    sendCLI :: SndFileId -> [XFTPServerWithAuth] -> m ()
+    sendCLI sndFileId xftpSrvs = do
+      let fileName = takeFileName filePath
+      workPath <- getXFTPWorkPath
+      outputDir <- uniqueCombine workPath $ fileName <> ".descr"
+      createDirectory outputDir
+      let tempPath = workPath </> "snd"
+      createDirectoryIfMissing False tempPath
+      runSend fileName outputDir tempPath `catchError` \e -> do
+        cleanup outputDir tempPath
+        notify c sndFileId $ SFERR e
+      where
+        runSend :: String -> FilePath -> FilePath -> m ()
+        runSend fileName outputDir tempPath = do
+          let sendOptions =
+                SendOptions
+                  { filePath,
+                    outputDir = Just outputDir,
+                    numRecipients,
+                    xftpServers = xftpSrvs,
+                    retryCount = 3,
+                    tempPath = Just tempPath,
+                    verbose = False
+                  }
+          liftCLI $ cliSendFileOpts sendOptions False $ notify c sndFileId .: SFPROG
+          (sndDescr, rcvDescrs) <- readDescrs outputDir fileName
+          cleanup outputDir tempPath
+          notify c sndFileId $ SFDONE sndDescr rcvDescrs
+        cleanup :: FilePath -> FilePath -> m ()
+        cleanup outputDir tempPath = do
+          removePath tempPath
+          removePath outputDir
+    liftCLI :: ExceptT CLIError IO () -> m ()
+    liftCLI = either (throwError . INTERNAL . show) pure <=< liftIO . runExceptT
+    readDescrs :: FilePath -> FilePath -> m (ValidFileDescription 'FSender, [ValidFileDescription 'FRecipient])
+    readDescrs outDir fileName = do
+      let descrDir = outDir </> (fileName <> ".xftp")
+      files <- listDirectory descrDir
+      let (sdFiles, rdFiles) = partition ("snd.xftp.private" `isSuffixOf`) files
+          sdFile = maybe "" (\l -> descrDir </> L.head l) (nonEmpty sdFiles)
+          rdFiles' = map (descrDir </>) rdFiles
+      (,) <$> readDescr sdFile <*> mapM readDescr rdFiles'
+    readDescr :: FilePartyI p => FilePath -> m (ValidFileDescription p)
+    readDescr f = liftIOEither $ first INTERNAL . strDecode <$> B.readFile f
+
+notify :: forall m e. (MonadUnliftIO m, AEntityI e) => AgentClient -> EntityId -> ACommand 'Agent e -> m ()
+notify c entId cmd = atomically $ writeTBQueue (subQ c) ("", entId, APC (sAEntity @e) cmd)
+
+sendFile :: AgentMonad m => AgentClient -> UserId -> FilePath -> Int -> m SndFileId
+sendFile c userId filePath numRecipients = do
+  g <- asks idsDrg
+  prefixPath <- getPrefixPath "snd.xftp"
+  createDirectory prefixPath
+  let relPrefixPath = takeFileName prefixPath
+  key <- liftIO C.randomSbKey
+  nonce <- liftIO C.randomCbNonce
+  -- saving absolute filePath will not allow to restore file encryption after app update, but it's a short window
+  fId <- withStore c $ \db -> createSndFile db g userId numRecipients filePath relPrefixPath key nonce
+  addXFTPSndWorker c Nothing
+  pure fId
+
+addXFTPSndWorker :: AgentMonad m => AgentClient -> Maybe XFTPServer -> m ()
+addXFTPSndWorker c = addWorker c xftpSndWorkers runXFTPSndWorker runXFTPSndPrepareWorker
+
+runXFTPSndPrepareWorker :: forall m. AgentMonad m => AgentClient -> TMVar () -> m ()
+runXFTPSndPrepareWorker c doWork = do
+  forever $ do
+    void . atomically $ readTMVar doWork
+    atomically $ assertAgentForeground c
+    runXFTPOperation
+  where
+    runXFTPOperation :: m ()
+    runXFTPOperation = do
+      sndFilesTTL <- asks (sndFilesTTL . config)
+      nextFile <- withStore' c (`getNextSndFileToPrepare` sndFilesTTL)
+      case nextFile of
+        Nothing -> noWorkToDo
+        Just f@SndFile {sndFileId, sndFileEntityId, prefixPath} ->
+          prepareFile f `catchError` (sndWorkerInternalError c sndFileId sndFileEntityId prefixPath . show)
+    noWorkToDo = void . atomically $ tryTakeTMVar doWork
+    prepareFile :: SndFile -> m ()
+    prepareFile SndFile {prefixPath = Nothing} =
+      throwError $ INTERNAL "no prefix path"
+    prepareFile sndFile@SndFile {sndFileId, userId, prefixPath = Just ppath, status} = do
+      SndFile {numRecipients, chunks} <-
+        if status /= SFSEncrypted -- status is SFSNew or SFSEncrypting
+          then do
+            fsEncPath <- toFSFilePath $ sndFileEncPath ppath
+            when (status == SFSEncrypting) $
+              whenM (doesFileExist fsEncPath) $ removeFile fsEncPath
+            withStore' c $ \db -> updateSndFileStatus db sndFileId SFSEncrypting
+            (digest, chunkSpecsDigests) <- encryptFileForUpload sndFile fsEncPath
+            withStore c $ \db -> do
+              updateSndFileEncrypted db sndFileId digest chunkSpecsDigests
+              getSndFile db sndFileId
+          else pure sndFile
+      maxRecipients <- asks (xftpMaxRecipientsPerRequest . config)
+      let numRecipients' = min numRecipients maxRecipients
+      -- concurrently?
+      forM_ (filter (not . chunkCreated) chunks) $ createChunk numRecipients'
+      withStore' c $ \db -> updateSndFileStatus db sndFileId SFSUploading
+      where
+        encryptFileForUpload :: SndFile -> FilePath -> m (FileDigest, [(XFTPChunkSpec, FileDigest)])
+        encryptFileForUpload SndFile {key, nonce, filePath} fsEncPath = do
+          let fileName = takeFileName filePath
+          fileSize <- fromInteger <$> getFileSize filePath
+          when (fileSize > maxFileSize) $ throwError $ INTERNAL "max file size exceeded"
+          let fileHdr = smpEncode FileHeader {fileName, fileExtra = Nothing}
+              fileSize' = fromIntegral (B.length fileHdr) + fileSize
+              chunkSizes = prepareChunkSizes $ fileSize' + fileSizeLen + authTagSize
+              chunkSizes' = map fromIntegral chunkSizes
+              encSize = sum chunkSizes'
+          void $ liftError (INTERNAL . show) $ encryptFile filePath fileHdr key nonce fileSize' encSize fsEncPath
+          digest <- liftIO $ LC.sha512Hash <$> LB.readFile fsEncPath
+          let chunkSpecs = prepareChunkSpecs fsEncPath chunkSizes
+          chunkDigests <- map FileDigest <$> mapM (liftIO . getChunkDigest) chunkSpecs
+          pure (FileDigest digest, zip chunkSpecs chunkDigests)
+        chunkCreated :: SndFileChunk -> Bool
+        chunkCreated SndFileChunk {replicas} =
+          any (\SndFileChunkReplica {replicaStatus} -> replicaStatus == SFRSCreated) replicas
+        createChunk :: Int -> SndFileChunk -> m ()
+        createChunk numRecipients' ch = do
+          atomically $ assertAgentForeground c
+          (replica, ProtoServerWithAuth srv _) <- tryCreate
+          withStore' c $ \db -> createSndFileReplica db ch replica
+          addXFTPSndWorker c $ Just srv
+          where
+            tryCreate = do
+              ri <- asks $ messageRetryInterval . config
+              usedSrvs <- newTVarIO ([] :: [XFTPServer])
+              withRetryInterval (riFast ri) $ \_ loop ->
+                createWithNextSrv usedSrvs
+                  `catchError` \e -> retryOnError "XFTP prepare worker" (retryLoop loop) (throwError e) e
+              where
+                retryLoop loop = atomically (assertAgentForeground c) >> loop
+            createWithNextSrv usedSrvs = do
+              deleted <- withStore' c $ \db -> getSndFileDeleted db sndFileId
+              when deleted $ throwError $ INTERNAL "file deleted, aborting chunk creation"
+              withNextSrv c userId usedSrvs [] $ \srvAuth -> do
+                replica <- agentXFTPNewChunk c ch numRecipients' srvAuth
+                pure (replica, srvAuth)
+
+sndWorkerInternalError :: AgentMonad m => AgentClient -> DBSndFileId -> SndFileId -> Maybe FilePath -> String -> m ()
+sndWorkerInternalError c sndFileId sndFileEntityId prefixPath internalErrStr = do
+  forM_ prefixPath $ removePath <=< toFSFilePath
+  withStore' c $ \db -> updateSndFileError db sndFileId internalErrStr
+  notify c sndFileEntityId $ SFERR $ INTERNAL internalErrStr
+
+runXFTPSndWorker :: forall m. AgentMonad m => AgentClient -> XFTPServer -> TMVar () -> m ()
+runXFTPSndWorker c srv doWork = do
+  forever $ do
+    void . atomically $ readTMVar doWork
+    atomically $ assertAgentForeground c
+    runXFTPOperation
+  where
+    noWorkToDo = void . atomically $ tryTakeTMVar doWork
+    runXFTPOperation :: m ()
+    runXFTPOperation = do
+      sndFilesTTL <- asks (sndFilesTTL . config)
+      nextChunk <- withStore' c $ \db -> getNextSndChunkToUpload db srv sndFilesTTL
+      case nextChunk of
+        Nothing -> noWorkToDo
+        Just SndFileChunk {sndFileId, sndFileEntityId, filePrefixPath, replicas = []} -> sndWorkerInternalError c sndFileId sndFileEntityId (Just filePrefixPath) "chunk has no replicas"
+        Just fc@SndFileChunk {userId, sndFileId, sndFileEntityId, filePrefixPath, digest, replicas = replica@SndFileChunkReplica {sndChunkReplicaId, server, delay} : _} -> do
+          ri <- asks $ reconnectInterval . config
+          let ri' = maybe ri (\d -> ri {initialInterval = d, increaseAfter = 0}) delay
+          withRetryInterval ri' $ \delay' loop ->
+            uploadFileChunk fc replica
+              `catchError` \e -> retryOnError "XFTP snd worker" (retryLoop loop e delay') (retryDone e) e
+          where
+            retryLoop loop e replicaDelay = do
+              flip catchError (\_ -> pure ()) $ do
+                notifyOnRetry <- asks (xftpNotifyErrsOnRetry . config)
+                when notifyOnRetry $ notify c sndFileEntityId $ SFERR e
+                closeXFTPServerClient c userId server digest
+                withStore' c $ \db -> updateSndChunkReplicaDelay db sndChunkReplicaId replicaDelay
+              atomically $ assertAgentForeground c
+              loop
+            retryDone e = sndWorkerInternalError c sndFileId sndFileEntityId (Just filePrefixPath) (show e)
+    uploadFileChunk :: SndFileChunk -> SndFileChunkReplica -> m ()
+    uploadFileChunk sndFileChunk@SndFileChunk {sndFileId, userId, chunkSpec = chunkSpec@XFTPChunkSpec {filePath}, digest = chunkDigest} replica = do
+      replica'@SndFileChunkReplica {sndChunkReplicaId} <- addRecipients sndFileChunk replica
+      fsFilePath <- toFSFilePath filePath
+      unlessM (doesFileExist fsFilePath) $ throwError $ INTERNAL "encrypted file doesn't exist on upload"
+      let chunkSpec' = chunkSpec {filePath = fsFilePath} :: XFTPChunkSpec
+      atomically $ assertAgentForeground c
+      agentXFTPUploadChunk c userId chunkDigest replica' chunkSpec'
+      sf@SndFile {sndFileEntityId, prefixPath, chunks} <- withStore c $ \db -> do
+        updateSndChunkReplicaStatus db sndChunkReplicaId SFRSUploaded
+        getSndFile db sndFileId
+      let uploaded = uploadedSize chunks
+          total = totalSize chunks
+          complete = all chunkUploaded chunks
+      notify c sndFileEntityId $ SFPROG uploaded total
+      when complete $ do
+        (sndDescr, rcvDescrs) <- sndFileToDescrs sf
+        notify c sndFileEntityId $ SFDONE sndDescr rcvDescrs
+        forM_ prefixPath $ removePath <=< toFSFilePath
+        withStore' c $ \db -> updateSndFileComplete db sndFileId
+      where
+        addRecipients :: SndFileChunk -> SndFileChunkReplica -> m SndFileChunkReplica
+        addRecipients ch@SndFileChunk {numRecipients} cr@SndFileChunkReplica {rcvIdsKeys}
+          | length rcvIdsKeys > numRecipients = throwError $ INTERNAL "too many recipients"
+          | length rcvIdsKeys == numRecipients = pure cr
+          | otherwise = do
+            maxRecipients <- asks $ xftpMaxRecipientsPerRequest . config
+            let numRecipients' = min (numRecipients - length rcvIdsKeys) maxRecipients
+            rcvIdsKeys' <- agentXFTPAddRecipients c userId chunkDigest cr numRecipients'
+            cr' <- withStore' c $ \db -> addSndChunkReplicaRecipients db cr $ L.toList rcvIdsKeys'
+            addRecipients ch cr'
+        sndFileToDescrs :: SndFile -> m (ValidFileDescription 'FSender, [ValidFileDescription 'FRecipient])
+        sndFileToDescrs SndFile {digest = Nothing} = throwError $ INTERNAL "snd file has no digest"
+        sndFileToDescrs SndFile {chunks = []} = throwError $ INTERNAL "snd file has no chunks"
+        sndFileToDescrs SndFile {digest = Just digest, key, nonce, chunks = chunks@(fstChunk : _)} = do
+          let chunkSize = FileSize $ sndChunkSize fstChunk
+              size = FileSize $ sum $ map (fromIntegral . sndChunkSize) chunks
+          -- snd description
+          sndDescrChunks <- mapM toSndDescrChunk chunks
+          let fdSnd = FileDescription {party = SFSender, size, digest, key, nonce, chunkSize, chunks = sndDescrChunks}
+          validFdSnd <- either (throwError . INTERNAL) pure $ validateFileDescription fdSnd
+          -- rcv descriptions
+          let fdRcv = FileDescription {party = SFRecipient, size, digest, key, nonce, chunkSize, chunks = []}
+              fdRcvs = createRcvFileDescriptions fdRcv chunks
+          validFdRcvs <- either (throwError . INTERNAL) pure $ mapM validateFileDescription fdRcvs
+          pure (validFdSnd, validFdRcvs)
+        toSndDescrChunk :: SndFileChunk -> m FileChunk
+        toSndDescrChunk SndFileChunk {replicas = []} = throwError $ INTERNAL "snd file chunk has no replicas"
+        toSndDescrChunk ch@SndFileChunk {chunkNo, digest = chDigest, replicas = (SndFileChunkReplica {server, replicaId, replicaKey} : _)} = do
+          let chunkSize = FileSize $ sndChunkSize ch
+              replicas = [FileChunkReplica {server, replicaId, replicaKey}]
+          pure FileChunk {chunkNo, digest = chDigest, chunkSize, replicas}
+        createRcvFileDescriptions :: FileDescription 'FRecipient -> [SndFileChunk] -> [FileDescription 'FRecipient]
+        createRcvFileDescriptions fd sndChunks = map (\chunks -> (fd :: (FileDescription 'FRecipient)) {chunks}) rcvChunks
+          where
+            rcvReplicas :: [SentRecipientReplica]
+            rcvReplicas = concatMap toSentRecipientReplicas sndChunks
+            toSentRecipientReplicas :: SndFileChunk -> [SentRecipientReplica]
+            toSentRecipientReplicas ch@SndFileChunk {chunkNo, digest, replicas} =
+              let chunkSize = FileSize $ sndChunkSize ch
+               in concatMap
+                    ( \SndFileChunkReplica {server, rcvIdsKeys} ->
+                        zipWith
+                          (\rcvNo (replicaId, replicaKey) -> SentRecipientReplica {chunkNo, server, rcvNo, replicaId, replicaKey, digest, chunkSize})
+                          [1 ..]
+                          rcvIdsKeys
+                    )
+                    replicas
+            rcvChunks :: [[FileChunk]]
+            rcvChunks = map (sortChunks . M.elems) $ M.elems $ foldl' addRcvChunk M.empty rcvReplicas
+            sortChunks :: [FileChunk] -> [FileChunk]
+            sortChunks = map reverseReplicas . sortOn (chunkNo :: FileChunk -> Int)
+            reverseReplicas ch@FileChunk {replicas} = (ch :: FileChunk) {replicas = reverse replicas}
+            addRcvChunk :: Map Int (Map Int FileChunk) -> SentRecipientReplica -> Map Int (Map Int FileChunk)
+            addRcvChunk m SentRecipientReplica {chunkNo, server, rcvNo, replicaId, replicaKey, digest, chunkSize} =
+              M.alter (Just . addOrChangeRecipient) rcvNo m
+              where
+                addOrChangeRecipient :: Maybe (Map Int FileChunk) -> Map Int FileChunk
+                addOrChangeRecipient = \case
+                  Just m' -> M.alter (Just . addOrChangeChunk) chunkNo m'
+                  _ -> M.singleton chunkNo $ FileChunk {chunkNo, digest, chunkSize, replicas = [replica']}
+                addOrChangeChunk :: Maybe FileChunk -> FileChunk
+                addOrChangeChunk = \case
+                  Just ch@FileChunk {replicas} -> ch {replicas = replica' : replicas}
+                  _ -> FileChunk {chunkNo, digest, chunkSize, replicas = [replica']}
+                replica' = FileChunkReplica {server, replicaId, replicaKey}
+        uploadedSize :: [SndFileChunk] -> Int64
+        uploadedSize = foldl' (\sz ch -> sz + uploadedChunkSize ch) 0
+        uploadedChunkSize ch
+          | chunkUploaded ch = fromIntegral (sndChunkSize ch)
+          | otherwise = 0
+        totalSize :: [SndFileChunk] -> Int64
+        totalSize = foldl' (\sz ch -> sz + fromIntegral (sndChunkSize ch)) 0
+        chunkUploaded :: SndFileChunk -> Bool
+        chunkUploaded SndFileChunk {replicas} =
+          any (\SndFileChunkReplica {replicaStatus} -> replicaStatus == SFRSUploaded) replicas
+
+deleteSndFileInternal :: AgentMonad m => AgentClient -> SndFileId -> m ()
+deleteSndFileInternal c sndFileEntityId = do
+  SndFile {sndFileId, prefixPath, status} <- withStore c $ \db -> getSndFileByEntityId db sndFileEntityId
+  if status == SFSComplete || status == SFSError
+    then do
+      forM_ prefixPath $ removePath <=< toFSFilePath
+      withStore' c (`deleteSndFile'` sndFileId)
+    else withStore' c (`updateSndFileDeleted` sndFileId)
+
+deleteSndFileRemote :: forall m. AgentMonad m => AgentClient -> UserId -> SndFileId -> ValidFileDescription 'FSender -> m ()
+deleteSndFileRemote c userId sndFileEntityId (ValidFileDescription FileDescription {chunks}) = do
+  deleteSndFileInternal c sndFileEntityId `catchError` (notify c sndFileEntityId . SFERR)
+  forM_ chunks $ \ch -> deleteFileChunk ch `catchError` (notify c sndFileEntityId . SFERR)
+  where
+    deleteFileChunk :: FileChunk -> m ()
+    deleteFileChunk FileChunk {digest, replicas = replica@FileChunkReplica {server} : _} = do
+      withStore' c $ \db -> createDeletedSndChunkReplica db userId replica digest
+      addXFTPDelWorker c server
+    deleteFileChunk _ = pure ()
+
+addXFTPDelWorker :: AgentMonad m => AgentClient -> XFTPServer -> m ()
+addXFTPDelWorker c srv = do
+  ws <- asks $ xftpDelWorkers . xftpAgent
+  atomically (TM.lookup srv ws) >>= \case
+    Nothing -> do
+      doWork <- newTMVarIO ()
+      worker <- async $ runXFTPDelWorker c srv doWork `E.finally` atomically (TM.delete srv ws)
+      atomically $ TM.insert srv (doWork, worker) ws
+    Just (doWork, _) ->
+      void . atomically $ tryPutTMVar doWork ()
+
+runXFTPDelWorker :: forall m. AgentMonad m => AgentClient -> XFTPServer -> TMVar () -> m ()
+runXFTPDelWorker c srv doWork = do
+  forever $ do
+    void . atomically $ readTMVar doWork
+    atomically $ assertAgentForeground c
+    runXFTPOperation
+  where
+    noWorkToDo = void . atomically $ tryTakeTMVar doWork
+    runXFTPOperation :: m ()
+    runXFTPOperation = do
+      -- no point in deleting files older than rcv ttl, as they will be expired on server
+      rcvFilesTTL <- asks (rcvFilesTTL . config)
+      nextReplica <- withStore' c $ \db -> getNextDeletedSndChunkReplica db srv rcvFilesTTL
+      case nextReplica of
+        Nothing -> noWorkToDo
+        Just replica@DeletedSndChunkReplica {deletedSndChunkReplicaId, userId, server, chunkDigest, delay} -> do
+          ri <- asks $ reconnectInterval . config
+          let ri' = maybe ri (\d -> ri {initialInterval = d, increaseAfter = 0}) delay
+          withRetryInterval ri' $ \delay' loop ->
+            deleteChunkReplica replica
+              `catchError` \e -> retryOnError "XFTP del worker" (retryLoop loop e delay') (retryDone e) e
+          where
+            retryLoop loop e replicaDelay = do
+              flip catchError (\_ -> pure ()) $ do
+                notifyOnRetry <- asks (xftpNotifyErrsOnRetry . config)
+                when notifyOnRetry $ notify c "" $ SFERR e
+                closeXFTPServerClient c userId server chunkDigest
+                withStore' c $ \db -> updateDeletedSndChunkReplicaDelay db deletedSndChunkReplicaId replicaDelay
+              atomically $ assertAgentForeground c
+              loop
+            retryDone e = delWorkerInternalError c deletedSndChunkReplicaId e
+    deleteChunkReplica :: DeletedSndChunkReplica -> m ()
+    deleteChunkReplica replica@DeletedSndChunkReplica {userId, deletedSndChunkReplicaId} = do
+      agentXFTPDeleteChunk c userId replica
+      withStore' c $ \db -> deleteDeletedSndChunkReplica db deletedSndChunkReplicaId
+
+delWorkerInternalError :: AgentMonad m => AgentClient -> Int64 -> AgentErrorType -> m ()
+delWorkerInternalError c deletedSndChunkReplicaId e = do
+  withStore' c $ \db -> deleteDeletedSndChunkReplica db deletedSndChunkReplicaId
+  notify c "" $ SFERR e
+
+assertAgentForeground :: AgentClient -> STM ()
+assertAgentForeground c = do
+  throwWhenInactive c
+  waitUntilForeground c

src/Simplex/FileTransfer/Client.hs

@@ -0,0 +1,219 @@
+{-# LANGUAGE BlockArguments #-}
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE TypeApplications #-}
+
+module Simplex.FileTransfer.Client where
+
+import Control.Monad.Except
+import Data.Bifunctor (first)
+import Data.ByteString.Builder (Builder, byteString)
+import Data.ByteString.Char8 (ByteString)
+import qualified Data.ByteString.Char8 as B
+import Data.Int (Int64)
+import Data.List.NonEmpty (NonEmpty (..))
+import Data.Time (UTCTime)
+import Data.Word (Word32)
+import qualified Network.HTTP.Types as N
+import qualified Network.HTTP2.Client as H
+import Simplex.FileTransfer.Description (mb)
+import Simplex.FileTransfer.Protocol
+import Simplex.FileTransfer.Transport
+import Simplex.Messaging.Client
+  ( NetworkConfig (..),
+    ProtocolClientError (..),
+    TransportSession,
+    chooseTransportHost,
+    defaultNetworkConfig,
+    proxyUsername,
+    transportClientConfig,
+  )
+import Simplex.Messaging.Client.Agent ()
+import qualified Simplex.Messaging.Crypto as C
+import qualified Simplex.Messaging.Crypto.Lazy as LC
+import Simplex.Messaging.Encoding.String
+import Simplex.Messaging.Protocol
+  ( BasicAuth,
+    Protocol (..),
+    ProtocolServer (..),
+    RecipientId,
+    SenderId,
+  )
+import Simplex.Messaging.Transport (supportedParameters)
+import Simplex.Messaging.Transport.Client (TransportClientConfig, TransportHost)
+import Simplex.Messaging.Transport.HTTP2
+import Simplex.Messaging.Transport.HTTP2.Client
+import Simplex.Messaging.Util (bshow, liftEitherError, whenM)
+import UnliftIO
+import UnliftIO.Directory
+
+data XFTPClient = XFTPClient
+  { http2Client :: HTTP2Client,
+    transportSession :: TransportSession FileResponse,
+    config :: XFTPClientConfig
+  }
+
+data XFTPClientConfig = XFTPClientConfig
+  { xftpNetworkConfig :: NetworkConfig,
+    uploadTimeoutPerMb :: Int64
+  }
+
+data XFTPChunkBody = XFTPChunkBody
+  { chunkSize :: Int,
+    chunkPart :: Int -> IO ByteString,
+    http2Body :: HTTP2Body
+  }
+
+data XFTPChunkSpec = XFTPChunkSpec
+  { filePath :: FilePath,
+    chunkOffset :: Int64,
+    chunkSize :: Word32
+  }
+  deriving (Eq, Show)
+
+type XFTPClientError = ProtocolClientError XFTPErrorType
+
+defaultXFTPClientConfig :: XFTPClientConfig
+defaultXFTPClientConfig =
+  XFTPClientConfig
+    { xftpNetworkConfig = defaultNetworkConfig,
+      uploadTimeoutPerMb = 10000000 -- 10 seconds
+    }
+
+getXFTPClient :: TransportSession FileResponse -> XFTPClientConfig -> (XFTPClient -> IO ()) -> IO (Either XFTPClientError XFTPClient)
+getXFTPClient transportSession@(_, srv, _) config@XFTPClientConfig {xftpNetworkConfig} disconnected = runExceptT $ do
+  let tcConfig = transportClientConfig xftpNetworkConfig
+      http2Config = xftpHTTP2Config tcConfig config
+      username = proxyUsername transportSession
+      ProtocolServer _ host port keyHash = srv
+  useHost <- liftEither $ chooseTransportHost xftpNetworkConfig host
+  clientVar <- newTVarIO Nothing
+  let usePort = if null port then "443" else port
+      clientDisconnected = readTVarIO clientVar >>= mapM_ disconnected
+  http2Client <- liftEitherError xftpClientError $ getVerifiedHTTP2Client (Just username) useHost usePort (Just keyHash) Nothing http2Config clientDisconnected
+  let c = XFTPClient {http2Client, transportSession, config}
+  atomically $ writeTVar clientVar $ Just c
+  pure c
+
+closeXFTPClient :: XFTPClient -> IO ()
+closeXFTPClient XFTPClient {http2Client} = closeHTTP2Client http2Client
+
+xftpClientServer :: XFTPClient -> String
+xftpClientServer = B.unpack . strEncode . snd3 . transportSession
+  where
+    snd3 (_, s, _) = s
+
+xftpTransportHost :: XFTPClient -> TransportHost
+xftpTransportHost = (host :: HClient -> TransportHost) . client_ . http2Client
+
+xftpSessionTs :: XFTPClient -> UTCTime
+xftpSessionTs = sessionTs . http2Client
+
+xftpHTTP2Config :: TransportClientConfig -> XFTPClientConfig -> HTTP2ClientConfig
+xftpHTTP2Config transportConfig XFTPClientConfig {xftpNetworkConfig = NetworkConfig {tcpConnectTimeout}} =
+  defaultHTTP2ClientConfig
+    { bodyHeadSize = xftpBlockSize,
+      suportedTLSParams = supportedParameters,
+      connTimeout = tcpConnectTimeout,
+      transportConfig
+    }
+
+xftpClientError :: HTTP2ClientError -> XFTPClientError
+xftpClientError = \case
+  HCResponseTimeout -> PCEResponseTimeout
+  HCNetworkError -> PCENetworkError
+  HCIOError e -> PCEIOError e
+
+sendXFTPCommand :: forall p. FilePartyI p => XFTPClient -> C.APrivateSignKey -> XFTPFileId -> FileCommand p -> Maybe XFTPChunkSpec -> ExceptT XFTPClientError IO (FileResponse, HTTP2Body)
+sendXFTPCommand XFTPClient {config, http2Client = http2@HTTP2Client {sessionId}} pKey fId cmd chunkSpec_ = do
+  t <-
+    liftEither . first PCETransportError $
+      xftpEncodeTransmission sessionId (Just pKey) ("", fId, FileCmd (sFileParty @p) cmd)
+  let req = H.requestStreaming N.methodPost "/" [] $ streamBody t
+      reqTimeout = (\XFTPChunkSpec {chunkSize} -> chunkTimeout config chunkSize) <$> chunkSpec_
+  HTTP2Response {respBody = body@HTTP2Body {bodyHead}} <- liftEitherError xftpClientError $ sendRequest http2 req reqTimeout
+  when (B.length bodyHead /= xftpBlockSize) $ throwError $ PCEResponseError BLOCK
+  -- TODO validate that the file ID is the same as in the request?
+  (_, _, (_, _fId, respOrErr)) <- liftEither . first PCEResponseError $ xftpDecodeTransmission sessionId bodyHead
+  case respOrErr of
+    Right r -> case protocolError r of
+      Just e -> throwError $ PCEProtocolError e
+      _ -> pure (r, body)
+    Left e -> throwError $ PCEResponseError e
+  where
+    streamBody :: ByteString -> (Builder -> IO ()) -> IO () -> IO ()
+    streamBody t send done = do
+      send $ byteString t
+      forM_ chunkSpec_ $ \XFTPChunkSpec {filePath, chunkOffset, chunkSize} ->
+        withFile filePath ReadMode $ \h -> do
+          hSeek h AbsoluteSeek $ fromIntegral chunkOffset
+          sendFile h send $ fromIntegral chunkSize
+      done
+
+createXFTPChunk ::
+  XFTPClient ->
+  C.APrivateSignKey ->
+  FileInfo ->
+  NonEmpty C.APublicVerifyKey ->
+  Maybe BasicAuth ->
+  ExceptT XFTPClientError IO (SenderId, NonEmpty RecipientId)
+createXFTPChunk c spKey file rcps auth_ =
+  sendXFTPCommand c spKey "" (FNEW file rcps auth_) Nothing >>= \case
+    (FRSndIds sId rIds, body) -> noFile body (sId, rIds)
+    (r, _) -> throwError . PCEUnexpectedResponse $ bshow r
+
+addXFTPRecipients :: XFTPClient -> C.APrivateSignKey -> XFTPFileId -> NonEmpty C.APublicVerifyKey -> ExceptT XFTPClientError IO (NonEmpty RecipientId)
+addXFTPRecipients c spKey fId rcps =
+  sendXFTPCommand c spKey fId (FADD rcps) Nothing >>= \case
+    (FRRcvIds rIds, body) -> noFile body rIds
+    (r, _) -> throwError . PCEUnexpectedResponse $ bshow r
+
+uploadXFTPChunk :: XFTPClient -> C.APrivateSignKey -> XFTPFileId -> XFTPChunkSpec -> ExceptT XFTPClientError IO ()
+uploadXFTPChunk c spKey fId chunkSpec =
+  sendXFTPCommand c spKey fId FPUT (Just chunkSpec) >>= okResponse
+
+downloadXFTPChunk :: XFTPClient -> C.APrivateSignKey -> XFTPFileId -> XFTPRcvChunkSpec -> ExceptT XFTPClientError IO ()
+downloadXFTPChunk c@XFTPClient {config} rpKey fId chunkSpec@XFTPRcvChunkSpec {filePath, chunkSize} = do
+  (rDhKey, rpDhKey) <- liftIO C.generateKeyPair'
+  sendXFTPCommand c rpKey fId (FGET rDhKey) Nothing >>= \case
+    (FRFile sDhKey cbNonce, HTTP2Body {bodyHead = _bg, bodySize = _bs, bodyPart}) -> case bodyPart of
+      -- TODO atm bodySize is set to 0, so chunkSize will be incorrect - validate once set
+      Just chunkPart -> do
+        let dhSecret = C.dh' sDhKey rpDhKey
+        cbState <- liftEither . first PCECryptoError $ LC.cbInit dhSecret cbNonce
+        let t = chunkTimeout config chunkSize
+        t `timeout` download cbState >>= maybe (throwError PCEResponseTimeout) pure
+        where
+          download cbState =
+            withExceptT PCEResponseError $
+              receiveEncFile chunkPart cbState chunkSpec `catchError` \e ->
+                whenM (doesFileExist filePath) (removeFile filePath) >> throwError e
+      _ -> throwError $ PCEResponseError NO_FILE
+    (r, _) -> throwError . PCEUnexpectedResponse $ bshow r
+
+chunkTimeout :: XFTPClientConfig -> Word32 -> Int
+chunkTimeout config chunkSize = fromIntegral $ (fromIntegral chunkSize * uploadTimeoutPerMb config) `div` mb 1
+
+deleteXFTPChunk :: XFTPClient -> C.APrivateSignKey -> SenderId -> ExceptT XFTPClientError IO ()
+deleteXFTPChunk c spKey sId = sendXFTPCommand c spKey sId FDEL Nothing >>= okResponse
+
+ackXFTPChunk :: XFTPClient -> C.APrivateSignKey -> RecipientId -> ExceptT XFTPClientError IO ()
+ackXFTPChunk c rpKey rId = sendXFTPCommand c rpKey rId FACK Nothing >>= okResponse
+
+okResponse :: (FileResponse, HTTP2Body) -> ExceptT XFTPClientError IO ()
+okResponse = \case
+  (FROk, body) -> noFile body ()
+  (r, _) -> throwError . PCEUnexpectedResponse $ bshow r
+
+-- TODO this currently does not check anything because response size is not set and bodyPart is always Just
+noFile :: HTTP2Body -> a -> ExceptT XFTPClientError IO a
+noFile HTTP2Body {bodyPart} a = case bodyPart of
+  Just _ -> pure a -- throwError $ PCEResponseError HAS_FILE
+  _ -> pure a
+
+-- FACK :: FileCommand Recipient
+-- PING :: FileCommand Recipient

src/Simplex/FileTransfer/Client/Agent.hs

@@ -0,0 +1,127 @@
+{-# LANGUAGE DeriveAnyClass #-}
+{-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE NumericUnderscores #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+module Simplex.FileTransfer.Client.Agent where
+
+import Control.Logger.Simple (logInfo)
+import Control.Monad.Except
+import Data.Bifunctor (first)
+import qualified Data.ByteString.Char8 as B
+import Data.Text (Text)
+import Data.Text.Encoding (decodeUtf8)
+import Simplex.FileTransfer.Client
+import Simplex.Messaging.Agent.RetryInterval
+import Simplex.Messaging.Client (NetworkConfig (..), ProtocolClientError (..), temporaryClientError)
+import Simplex.Messaging.Client.Agent ()
+import Simplex.Messaging.Encoding.String
+import Simplex.Messaging.Protocol (ProtocolServer (..), XFTPServer)
+import Simplex.Messaging.TMap (TMap)
+import qualified Simplex.Messaging.TMap as TM
+import Simplex.Messaging.Util (catchAll_, tryError)
+import UnliftIO
+
+type XFTPClientVar = TMVar (Either XFTPClientAgentError XFTPClient)
+
+data XFTPClientAgent = XFTPClientAgent
+  { xftpClients :: TMap XFTPServer XFTPClientVar,
+    config :: XFTPClientAgentConfig
+  }
+
+data XFTPClientAgentConfig = XFTPClientAgentConfig
+  { xftpConfig :: XFTPClientConfig,
+    reconnectInterval :: RetryInterval
+  }
+
+defaultXFTPClientAgentConfig :: XFTPClientAgentConfig
+defaultXFTPClientAgentConfig =
+  XFTPClientAgentConfig
+    { xftpConfig = defaultXFTPClientConfig,
+      reconnectInterval =
+        RetryInterval
+          { initialInterval = 5_000000,
+            increaseAfter = 10_000000,
+            maxInterval = 60_000000
+          }
+    }
+
+data XFTPClientAgentError = XFTPClientAgentError XFTPServer XFTPClientError
+  deriving (Show, Exception)
+
+newXFTPAgent :: XFTPClientAgentConfig -> STM XFTPClientAgent
+newXFTPAgent config = do
+  xftpClients <- TM.empty
+  pure XFTPClientAgent {xftpClients, config}
+
+type ME a = ExceptT XFTPClientAgentError IO a
+
+getXFTPServerClient :: XFTPClientAgent -> XFTPServer -> ME XFTPClient
+getXFTPServerClient XFTPClientAgent {xftpClients, config} srv = do
+  atomically getClientVar >>= either newXFTPClient waitForXFTPClient
+  where
+    connectClient :: ME XFTPClient
+    connectClient =
+      ExceptT $
+        first (XFTPClientAgentError srv)
+          <$> getXFTPClient (1, srv, Nothing) (xftpConfig config) clientDisconnected
+
+    clientDisconnected :: XFTPClient -> IO ()
+    clientDisconnected _ = do
+      atomically $ TM.delete srv xftpClients
+      logInfo $ "disconnected from " <> showServer srv
+
+    getClientVar :: STM (Either XFTPClientVar XFTPClientVar)
+    getClientVar = maybe (Left <$> newClientVar) (pure . Right) =<< TM.lookup srv xftpClients
+      where
+        newClientVar :: STM XFTPClientVar
+        newClientVar = do
+          var <- newEmptyTMVar
+          TM.insert srv var xftpClients
+          pure var
+
+    waitForXFTPClient :: XFTPClientVar -> ME XFTPClient
+    waitForXFTPClient clientVar = do
+      let XFTPClientConfig {xftpNetworkConfig = NetworkConfig {tcpConnectTimeout}} = xftpConfig config
+      client_ <- tcpConnectTimeout `timeout` atomically (readTMVar clientVar)
+      liftEither $ case client_ of
+        Just (Right c) -> Right c
+        Just (Left e) -> Left e
+        Nothing -> Left $ XFTPClientAgentError srv PCEResponseTimeout
+
+    newXFTPClient :: XFTPClientVar -> ME XFTPClient
+    newXFTPClient clientVar = tryConnectClient tryConnectAsync
+      where
+        tryConnectClient :: ME () -> ME XFTPClient
+        tryConnectClient retryAction =
+          tryError connectClient >>= \r -> case r of
+            Right client -> do
+              logInfo $ "connected to " <> showServer srv
+              atomically $ putTMVar clientVar r
+              pure client
+            Left e@(XFTPClientAgentError _ e') -> do
+              if temporaryClientError e'
+                then retryAction
+                else atomically $ do
+                  putTMVar clientVar r
+                  TM.delete srv xftpClients
+              throwError e
+        tryConnectAsync :: ME ()
+        tryConnectAsync = void . async $ do
+          withRetryInterval (reconnectInterval config) $ \_ loop -> void $ tryConnectClient loop
+
+showServer :: XFTPServer -> Text
+showServer ProtocolServer {host, port} =
+  decodeUtf8 $ strEncode host <> B.pack (if null port then "" else ':' : port)
+
+closeXFTPServerClient :: XFTPClientAgent -> XFTPServer -> IO ()
+closeXFTPServerClient XFTPClientAgent {xftpClients, config} srv =
+  atomically (TM.lookupDelete srv xftpClients) >>= mapM_ closeClient
+  where
+    closeClient cVar = do
+      let NetworkConfig {tcpConnectTimeout} = xftpNetworkConfig $ xftpConfig config
+      tcpConnectTimeout `timeout` atomically (readTMVar cVar) >>= \case
+        Just (Right client) -> closeXFTPClient client `catchAll_` pure ()
+        _ -> pure ()

src/Simplex/FileTransfer/Client/Main.hs

@@ -0,0 +1,601 @@
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE DeriveAnyClass #-}
+{-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE GADTs #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE TypeApplications #-}
+
+module Simplex.FileTransfer.Client.Main
+  ( SendOptions (..),
+    CLIError (..),
+    xftpClientCLI,
+    cliSendFile,
+    cliSendFileOpts,
+    prepareChunkSizes,
+    prepareChunkSpecs,
+    chunkSize1,
+    chunkSize2,
+    chunkSize3,
+    maxFileSize,
+    fileSizeLen,
+    getChunkDigest,
+    SentRecipientReplica (..),
+  )
+where
+
+import Control.Concurrent.STM (stateTVar)
+import Control.Logger.Simple
+import Control.Monad
+import Control.Monad.Except
+import Crypto.Random (getRandomBytes)
+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)
+import Data.Int (Int64)
+import Data.List (foldl', sortOn)
+import Data.List.NonEmpty (NonEmpty (..), nonEmpty)
+import qualified Data.List.NonEmpty as L
+import Data.Map (Map)
+import qualified Data.Map as M
+import Data.Maybe (fromMaybe)
+import qualified Data.Text as T
+import Data.Word (Word32)
+import GHC.Records (HasField (getField))
+import Options.Applicative
+import Simplex.FileTransfer.Client
+import Simplex.FileTransfer.Client.Agent
+import Simplex.FileTransfer.Client.Presets
+import Simplex.FileTransfer.Crypto
+import Simplex.FileTransfer.Description
+import Simplex.FileTransfer.Protocol
+import Simplex.FileTransfer.Transport (XFTPRcvChunkSpec (..))
+import Simplex.FileTransfer.Types
+import Simplex.FileTransfer.Util (uniqueCombine)
+import qualified Simplex.Messaging.Crypto as C
+import qualified Simplex.Messaging.Crypto.Lazy as LC
+import Simplex.Messaging.Encoding
+import Simplex.Messaging.Encoding.String (StrEncoding (..))
+import Simplex.Messaging.Parsers (parseAll)
+import Simplex.Messaging.Protocol (ProtoServerWithAuth (..), SenderId, SndPrivateSignKey, XFTPServer, XFTPServerWithAuth)
+import Simplex.Messaging.Server.CLI (getCliCommand')
+import Simplex.Messaging.Util (groupAllOn, ifM, tshow, whenM)
+import System.Exit (exitFailure)
+import System.FilePath (splitFileName, (</>))
+import System.IO.Temp (getCanonicalTemporaryDirectory)
+import System.Random (StdGen, newStdGen, randomR)
+import UnliftIO
+import UnliftIO.Directory
+
+xftpClientVersion :: String
+xftpClientVersion = "0.1.0"
+
+chunkSize1 :: Word32
+chunkSize1 = kb 256
+
+chunkSize2 :: Word32
+chunkSize2 = mb 1
+
+chunkSize3 :: Word32
+chunkSize3 = mb 4
+
+maxFileSize :: Int64
+maxFileSize = gb 1
+
+maxFileSizeStr :: String
+maxFileSizeStr = B.unpack . strEncode $ FileSize maxFileSize
+
+fileSizeLen :: Int64
+fileSizeLen = 8
+
+newtype CLIError = CLIError String
+  deriving (Eq, Show, Exception)
+
+cliCryptoError :: FTCryptoError -> CLIError
+cliCryptoError = \case
+  FTCECryptoError e -> CLIError $ "Error decrypting file: " <> show e
+  FTCEInvalidHeader e -> CLIError $ "Invalid file header: " <> e
+  FTCEInvalidAuthTag -> CLIError "Error decrypting file: incorrect auth tag"
+  FTCEFileIOError e -> CLIError $ "File IO error: " <> show e
+
+data CliCommand
+  = SendFile SendOptions
+  | ReceiveFile ReceiveOptions
+  | DeleteFile DeleteOptions
+  | RandomFile RandomFileOptions
+  | FileDescrInfo InfoOptions
+
+data SendOptions = SendOptions
+  { filePath :: FilePath,
+    outputDir :: Maybe FilePath,
+    numRecipients :: Int,
+    xftpServers :: [XFTPServerWithAuth],
+    retryCount :: Int,
+    tempPath :: Maybe FilePath,
+    verbose :: Bool
+  }
+  deriving (Show)
+
+data ReceiveOptions = ReceiveOptions
+  { fileDescription :: FilePath,
+    filePath :: Maybe FilePath,
+    retryCount :: Int,
+    tempPath :: Maybe FilePath,
+    verbose :: Bool,
+    yes :: Bool
+  }
+  deriving (Show)
+
+data DeleteOptions = DeleteOptions
+  { fileDescription :: FilePath,
+    retryCount :: Int,
+    verbose :: Bool,
+    yes :: Bool
+  }
+  deriving (Show)
+
+newtype InfoOptions = InfoOptions
+  { fileDescription :: FilePath
+  }
+  deriving (Show)
+
+data RandomFileOptions = RandomFileOptions
+  { filePath :: FilePath,
+    fileSize :: FileSize Int64
+  }
+  deriving (Show)
+
+defaultRetryCount :: Int
+defaultRetryCount = 3
+
+cliCommandP :: Parser CliCommand
+cliCommandP =
+  hsubparser
+    ( command "send" (info (SendFile <$> sendP) (progDesc "Send file"))
+        <> command "recv" (info (ReceiveFile <$> receiveP) (progDesc "Receive file"))
+        <> command "del" (info (DeleteFile <$> deleteP) (progDesc "Delete file from server(s)"))
+        <> command "info" (info (FileDescrInfo <$> infoP) (progDesc "Show file description"))
+    )
+    <|> hsubparser (command "rand" (info (RandomFile <$> randomP) (progDesc "Generate a random file of a given size")) <> internal)
+  where
+    sendP :: Parser SendOptions
+    sendP =
+      SendOptions
+        <$> argument str (metavar "FILE" <> help "File to send")
+        <*> optional (argument str $ metavar "DIR" <> help "Directory to save file descriptions (default: current directory)")
+        <*> option auto (short 'n' <> metavar "COUNT" <> help "Number of recipients" <> value 1 <> showDefault)
+        <*> xftpServers
+        <*> retryCountP
+        <*> temp
+        <*> verboseP
+    receiveP :: Parser ReceiveOptions
+    receiveP =
+      ReceiveOptions
+        <$> fileDescrArg
+        <*> optional (argument str $ metavar "DIR" <> help "Directory to save file (default: system Downloads directory)")
+        <*> retryCountP
+        <*> temp
+        <*> verboseP
+        <*> yesP
+    deleteP :: Parser DeleteOptions
+    deleteP =
+      DeleteOptions
+        <$> fileDescrArg
+        <*> retryCountP
+        <*> verboseP
+        <*> yesP
+    infoP :: Parser InfoOptions
+    infoP = InfoOptions <$> fileDescrArg
+    randomP :: Parser RandomFileOptions
+    randomP =
+      RandomFileOptions
+        <$> argument str (metavar "FILE" <> help "Path to save file")
+        <*> argument str (metavar "SIZE" <> help "File size (bytes/kb/mb/gb)")
+    fileDescrArg = argument str (metavar "FILE" <> help "File description file")
+    retryCountP = option auto (long "retry" <> short 'r' <> metavar "RETRY" <> help "Number of network retries" <> value defaultRetryCount <> showDefault)
+    temp = optional (strOption $ long "tmp" <> metavar "TMP" <> help "Directory for temporary encrypted file (default: system temp directory)")
+    verboseP = switch (long "verbose" <> short 'v' <> help "Verbose output")
+    yesP = switch (long "yes" <> short 'y' <> help "Yes to questions")
+    xftpServers =
+      option
+        parseXFTPServers
+        ( long "servers"
+            <> short 's'
+            <> metavar "SERVER"
+            <> help "Semicolon-separated list of XFTP server(s) to use (each server can have more than one hostname)"
+            <> value []
+        )
+    parseXFTPServers = eitherReader $ parseAll xftpServersP . B.pack
+    xftpServersP = strP `A.sepBy1` A.char ';'
+
+data SentFileChunk = SentFileChunk
+  { chunkNo :: Int,
+    sndId :: SenderId,
+    sndPrivateKey :: SndPrivateSignKey,
+    chunkSize :: FileSize Word32,
+    digest :: FileDigest,
+    replicas :: [SentFileChunkReplica]
+  }
+  deriving (Eq, Show)
+
+data SentFileChunkReplica = SentFileChunkReplica
+  { server :: XFTPServer,
+    recipients :: [(ChunkReplicaId, C.APrivateSignKey)]
+  }
+  deriving (Eq, Show)
+
+data SentRecipientReplica = SentRecipientReplica
+  { chunkNo :: Int,
+    server :: XFTPServer,
+    rcvNo :: Int,
+    replicaId :: ChunkReplicaId,
+    replicaKey :: C.APrivateSignKey,
+    digest :: FileDigest,
+    chunkSize :: FileSize Word32
+  }
+
+logCfg :: LogConfig
+logCfg = LogConfig {lc_file = Nothing, lc_stderr = True}
+
+xftpClientCLI :: IO ()
+xftpClientCLI =
+  getCliCommand' cliCommandP clientVersion >>= \case
+    SendFile opts -> runLogE opts $ cliSendFile opts
+    ReceiveFile opts -> runLogE opts $ cliReceiveFile opts
+    DeleteFile opts -> runLogE opts $ cliDeleteFile opts
+    FileDescrInfo opts -> runE $ cliFileDescrInfo opts
+    RandomFile opts -> cliRandomFile opts
+  where
+    clientVersion = "SimpleX XFTP client v" <> xftpClientVersion
+
+runLogE :: HasField "verbose" a Bool => a -> ExceptT CLIError IO () -> IO ()
+runLogE opts a
+  | getField @"verbose" opts = setLogLevel LogDebug >> withGlobalLogging logCfg (runE a)
+  | otherwise = runE a
+
+runE :: ExceptT CLIError IO () -> IO ()
+runE a =
+  runExceptT a >>= \case
+    Left (CLIError e) -> putStrLn e >> exitFailure
+    _ -> pure ()
+
+cliSendFile :: SendOptions -> ExceptT CLIError IO ()
+cliSendFile opts = cliSendFileOpts opts True $ printProgress "Uploaded"
+
+cliSendFileOpts :: SendOptions -> Bool -> (Int64 -> Int64 -> IO ()) -> ExceptT CLIError IO ()
+cliSendFileOpts SendOptions {filePath, outputDir, numRecipients, xftpServers, retryCount, tempPath, verbose} printInfo notifyProgress = do
+  let (_, fileName) = splitFileName filePath
+  liftIO $ when printInfo $ printNoNewLine "Encrypting file..."
+  (encPath, fdRcv, fdSnd, chunkSpecs, encSize) <- encryptFileForUpload fileName
+  liftIO $ when printInfo $ printNoNewLine "Uploading file..."
+  uploadedChunks <- newTVarIO []
+  sentChunks <- uploadFile chunkSpecs uploadedChunks encSize
+  whenM (doesFileExist encPath) $ removeFile encPath
+  -- TODO if only small chunks, use different default size
+  liftIO $ do
+    let fdRcvs = createRcvFileDescriptions fdRcv sentChunks
+        fdSnd' = createSndFileDescription fdSnd sentChunks
+    (fdRcvPaths, fdSndPath) <- writeFileDescriptions fileName fdRcvs fdSnd'
+    when printInfo $ do
+      printNoNewLine "File uploaded!"
+      putStrLn $ "\nSender file description: " <> fdSndPath
+      putStrLn "Pass file descriptions to the recipient(s):"
+    forM_ fdRcvPaths putStrLn
+  where
+    encryptFileForUpload :: String -> ExceptT CLIError IO (FilePath, FileDescription 'FRecipient, FileDescription 'FSender, [XFTPChunkSpec], Int64)
+    encryptFileForUpload fileName = do
+      fileSize <- fromInteger <$> getFileSize filePath
+      when (fileSize > maxFileSize) $ throwError $ CLIError $ "Files bigger than " <> maxFileSizeStr <> " are not supported"
+      encPath <- getEncPath tempPath "xftp"
+      key <- liftIO C.randomSbKey
+      nonce <- liftIO C.randomCbNonce
+      let fileHdr = smpEncode FileHeader {fileName, fileExtra = Nothing}
+          fileSize' = fromIntegral (B.length fileHdr) + fileSize
+          chunkSizes = prepareChunkSizes $ fileSize' + fileSizeLen + authTagSize
+          defChunkSize = head chunkSizes
+          chunkSizes' = map fromIntegral chunkSizes
+          encSize = sum chunkSizes'
+      withExceptT (CLIError . show) $ encryptFile filePath fileHdr key nonce fileSize' encSize encPath
+      digest <- liftIO $ LC.sha512Hash <$> LB.readFile encPath
+      let chunkSpecs = prepareChunkSpecs encPath chunkSizes
+          fdRcv = FileDescription {party = SFRecipient, size = FileSize encSize, digest = FileDigest digest, key, nonce, chunkSize = FileSize defChunkSize, chunks = []}
+          fdSnd = FileDescription {party = SFSender, size = FileSize encSize, digest = FileDigest digest, key, nonce, chunkSize = FileSize defChunkSize, chunks = []}
+      logInfo $ "encrypted file to " <> tshow encPath
+      pure (encPath, fdRcv, fdSnd, chunkSpecs, encSize)
+    uploadFile :: [XFTPChunkSpec] -> TVar [Int64] -> Int64 -> ExceptT CLIError IO [SentFileChunk]
+    uploadFile chunks uploadedChunks encSize = do
+      a <- atomically $ newXFTPAgent defaultXFTPClientAgentConfig
+      gen <- newTVarIO =<< liftIO newStdGen
+      let xftpSrvs = fromMaybe defaultXFTPServers (nonEmpty xftpServers)
+      srvs <- liftIO $ replicateM (length chunks) $ getXFTPServer gen xftpSrvs
+      let thd3 (_, _, x) = x
+          chunks' = groupAllOn thd3 $ zip3 [1 ..] chunks srvs
+      -- TODO shuffle/unshuffle chunks
+      -- the reason we don't do pooled downloads here within one server is that http2 library doesn't handle cleint concurrency, even though
+      -- upload doesn't allow other requests within the same client until complete (but download does allow).
+      logInfo $ "uploading " <> tshow (length chunks) <> " chunks..."
+      map snd . sortOn fst . concat <$> pooledForConcurrentlyN 16 chunks' (mapM $ uploadFileChunk a)
+      where
+        uploadFileChunk :: XFTPClientAgent -> (Int, XFTPChunkSpec, XFTPServerWithAuth) -> ExceptT CLIError IO (Int, SentFileChunk)
+        uploadFileChunk a (chunkNo, chunkSpec@XFTPChunkSpec {chunkSize}, ProtoServerWithAuth xftpServer auth) = do
+          logInfo $ "uploading chunk " <> tshow chunkNo <> " to " <> showServer xftpServer <> "..."
+          (sndKey, spKey) <- liftIO $ C.generateSignatureKeyPair C.SEd25519
+          rKeys <- liftIO $ L.fromList <$> replicateM numRecipients (C.generateSignatureKeyPair C.SEd25519)
+          digest <- liftIO $ getChunkDigest chunkSpec
+          let ch = FileInfo {sndKey, size = fromIntegral chunkSize, digest}
+          c <- withRetry retryCount $ getXFTPServerClient a xftpServer
+          (sndId, rIds) <- withRetry retryCount $ createXFTPChunk c spKey ch (L.map fst rKeys) auth
+          withReconnect a xftpServer retryCount $ \c' -> uploadXFTPChunk c' spKey sndId chunkSpec
+          logInfo $ "uploaded chunk " <> tshow chunkNo
+          uploaded <- atomically . stateTVar uploadedChunks $ \cs ->
+            let cs' = fromIntegral chunkSize : cs in (sum cs', cs')
+          liftIO $ do
+            notifyProgress uploaded encSize
+            when verbose $ putStrLn ""
+          let recipients = L.toList $ L.map ChunkReplicaId rIds `L.zip` L.map snd rKeys
+              replicas = [SentFileChunkReplica {server = xftpServer, recipients}]
+          pure (chunkNo, SentFileChunk {chunkNo, sndId, sndPrivateKey = spKey, chunkSize = FileSize $ fromIntegral chunkSize, digest = FileDigest digest, replicas})
+        getXFTPServer :: TVar StdGen -> NonEmpty XFTPServerWithAuth -> IO XFTPServerWithAuth
+        getXFTPServer gen = \case
+          srv :| [] -> pure srv
+          servers -> do
+            atomically $ (servers L.!!) <$> stateTVar gen (randomR (0, L.length servers - 1))
+
+    -- M chunks, R replicas, N recipients
+    -- rcvReplicas: M[SentFileChunk] -> M * R * N [SentRecipientReplica]
+    -- rcvChunks: M * R * N [SentRecipientReplica] -> N[ M[FileChunk] ]
+    createRcvFileDescriptions :: FileDescription 'FRecipient -> [SentFileChunk] -> [FileDescription 'FRecipient]
+    createRcvFileDescriptions fd sentChunks = map (\chunks -> (fd :: (FileDescription 'FRecipient)) {chunks}) rcvChunks
+      where
+        rcvReplicas :: [SentRecipientReplica]
+        rcvReplicas =
+          concatMap
+            ( \SentFileChunk {chunkNo, digest, chunkSize, replicas} ->
+                concatMap
+                  ( \SentFileChunkReplica {server, recipients} ->
+                      zipWith (\rcvNo (replicaId, replicaKey) -> SentRecipientReplica {chunkNo, server, rcvNo, replicaId, replicaKey, digest, chunkSize}) [1 ..] recipients
+                  )
+                  replicas
+            )
+            sentChunks
+        rcvChunks :: [[FileChunk]]
+        rcvChunks = map (sortChunks . M.elems) $ M.elems $ foldl' addRcvChunk M.empty rcvReplicas
+        sortChunks :: [FileChunk] -> [FileChunk]
+        sortChunks = map reverseReplicas . sortOn (chunkNo :: FileChunk -> Int)
+        reverseReplicas ch@FileChunk {replicas} = (ch :: FileChunk) {replicas = reverse replicas}
+        addRcvChunk :: Map Int (Map Int FileChunk) -> SentRecipientReplica -> Map Int (Map Int FileChunk)
+        addRcvChunk m SentRecipientReplica {chunkNo, server, rcvNo, replicaId, replicaKey, digest, chunkSize} =
+          M.alter (Just . addOrChangeRecipient) rcvNo m
+          where
+            addOrChangeRecipient :: Maybe (Map Int FileChunk) -> Map Int FileChunk
+            addOrChangeRecipient = \case
+              Just m' -> M.alter (Just . addOrChangeChunk) chunkNo m'
+              _ -> M.singleton chunkNo $ FileChunk {chunkNo, digest, chunkSize, replicas = [replica]}
+            addOrChangeChunk :: Maybe FileChunk -> FileChunk
+            addOrChangeChunk = \case
+              Just ch@FileChunk {replicas} -> ch {replicas = replica : replicas}
+              _ -> FileChunk {chunkNo, digest, chunkSize, replicas = [replica]}
+            replica = FileChunkReplica {server, replicaId, replicaKey}
+    createSndFileDescription :: FileDescription 'FSender -> [SentFileChunk] -> FileDescription 'FSender
+    createSndFileDescription fd sentChunks = fd {chunks = sndChunks}
+      where
+        sndChunks :: [FileChunk]
+        sndChunks =
+          map
+            ( \SentFileChunk {chunkNo, sndId, sndPrivateKey, chunkSize, digest, replicas} ->
+                FileChunk {chunkNo, digest, chunkSize, replicas = sndReplicas replicas (ChunkReplicaId sndId) sndPrivateKey}
+            )
+            sentChunks
+        -- SentFileChunk having sndId and sndPrivateKey represents the current implementation's limitation
+        -- that sender uploads each chunk only to one server, so we can use the first replica's server for FileChunkReplica
+        sndReplicas :: [SentFileChunkReplica] -> ChunkReplicaId -> C.APrivateSignKey -> [FileChunkReplica]
+        sndReplicas [] _ _ = []
+        sndReplicas (SentFileChunkReplica {server} : _) replicaId replicaKey = [FileChunkReplica {server, replicaId, replicaKey}]
+    writeFileDescriptions :: String -> [FileDescription 'FRecipient] -> FileDescription 'FSender -> IO ([FilePath], FilePath)
+    writeFileDescriptions fileName fdRcvs fdSnd = do
+      outDir <- uniqueCombine (fromMaybe "." outputDir) (fileName <> ".xftp")
+      createDirectoryIfMissing True outDir
+      fdRcvPaths <- forM (zip [1 ..] fdRcvs) $ \(i :: Int, fd) -> do
+        let fdPath = outDir </> ("rcv" <> show i <> ".xftp")
+        B.writeFile fdPath $ strEncode fd
+        pure fdPath
+      let fdSndPath = outDir </> "snd.xftp.private"
+      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
+    LC.sha256Hash <$> LB.hGet h (fromIntegral chunkSize)
+
+cliReceiveFile :: ReceiveOptions -> ExceptT CLIError IO ()
+cliReceiveFile ReceiveOptions {fileDescription, filePath, retryCount, tempPath, verbose, yes} =
+  getFileDescription' fileDescription >>= receiveFile
+  where
+    receiveFile :: ValidFileDescription 'FRecipient -> ExceptT CLIError IO ()
+    receiveFile (ValidFileDescription FileDescription {size, digest, key, nonce, chunks}) = do
+      encPath <- getEncPath tempPath "xftp"
+      createDirectory encPath
+      a <- atomically $ newXFTPAgent defaultXFTPClientAgentConfig
+      liftIO $ printNoNewLine "Downloading file..."
+      downloadedChunks <- newTVarIO []
+      let srv FileChunk {replicas} = server (head replicas :: FileChunkReplica)
+          srvChunks = groupAllOn srv chunks
+      chunkPaths <- map snd . sortOn fst . concat <$> pooledForConcurrentlyN 16 srvChunks (mapM $ downloadFileChunk a encPath size downloadedChunks)
+      encDigest <- liftIO $ LC.sha512Hash <$> readChunks chunkPaths
+      when (encDigest /= unFileDigest digest) $ throwError $ CLIError "File digest mismatch"
+      encSize <- liftIO $ foldM (\s path -> (s +) . fromIntegral <$> getFileSize path) 0 chunkPaths
+      when (FileSize encSize /= size) $ throwError $ CLIError "File size mismatch"
+      liftIO $ printNoNewLine "Decrypting file..."
+      path <- withExceptT cliCryptoError $ decryptChunks encSize chunkPaths key nonce getFilePath
+      forM_ chunks $ acknowledgeFileChunk a
+      whenM (doesPathExist encPath) $ removeDirectoryRecursive encPath
+      liftIO $ do
+        printNoNewLine $ "File downloaded: " <> path
+        removeFD yes fileDescription
+    downloadFileChunk :: XFTPClientAgent -> FilePath -> FileSize Int64 -> TVar [Int64] -> FileChunk -> ExceptT CLIError IO (Int, FilePath)
+    downloadFileChunk a encPath (FileSize encSize) downloadedChunks FileChunk {chunkNo, chunkSize, digest, replicas = replica : _} = do
+      let FileChunkReplica {server, replicaId, replicaKey} = replica
+      logInfo $ "downloading chunk " <> tshow chunkNo <> " from " <> showServer server <> "..."
+      chunkPath <- uniqueCombine encPath $ show chunkNo
+      let chunkSpec = XFTPRcvChunkSpec chunkPath (unFileSize chunkSize) (unFileDigest digest)
+      withReconnect a server retryCount $ \c -> downloadXFTPChunk c replicaKey (unChunkReplicaId replicaId) chunkSpec
+      logInfo $ "downloaded chunk " <> tshow chunkNo <> " to " <> T.pack chunkPath
+      downloaded <- atomically . stateTVar downloadedChunks $ \cs ->
+        let cs' = fromIntegral (unFileSize chunkSize) : cs in (sum cs', cs')
+      liftIO $ do
+        printProgress "Downloaded" downloaded encSize
+        when verbose $ putStrLn ""
+      pure (chunkNo, chunkPath)
+    downloadFileChunk _ _ _ _ _ = throwError $ CLIError "chunk has no replicas"
+    getFilePath :: String -> ExceptT String IO FilePath
+    getFilePath name =
+      case filePath of
+        Just path ->
+          ifM (doesDirectoryExist path) (uniqueCombine path name) $
+            ifM (doesFileExist path) (throwError "File already exists") (pure path)
+        _ -> (`uniqueCombine` name) . (</> "Downloads") =<< getHomeDirectory
+    acknowledgeFileChunk :: XFTPClientAgent -> FileChunk -> ExceptT CLIError IO ()
+    acknowledgeFileChunk a FileChunk {replicas = replica : _} = do
+      let FileChunkReplica {server, replicaId, replicaKey} = replica
+      c <- withRetry retryCount $ getXFTPServerClient a server
+      withRetry retryCount $ ackXFTPChunk c replicaKey (unChunkReplicaId replicaId)
+    acknowledgeFileChunk _ _ = throwError $ CLIError "chunk has no replicas"
+
+printProgress :: String -> Int64 -> Int64 -> IO ()
+printProgress s part total = printNoNewLine $ s <> " " <> show ((part * 100) `div` total) <> "%"
+
+printNoNewLine :: String -> IO ()
+printNoNewLine s = do
+  putStr $ s <> replicate (max 0 $ 25 - length s) ' ' <> "\r"
+  hFlush stdout
+
+cliDeleteFile :: DeleteOptions -> ExceptT CLIError IO ()
+cliDeleteFile DeleteOptions {fileDescription, retryCount, yes} = do
+  getFileDescription' fileDescription >>= deleteFile
+  where
+    deleteFile :: ValidFileDescription 'FSender -> ExceptT CLIError IO ()
+    deleteFile (ValidFileDescription FileDescription {chunks}) = do
+      a <- atomically $ newXFTPAgent defaultXFTPClientAgentConfig
+      forM_ chunks $ deleteFileChunk a
+      liftIO $ do
+        printNoNewLine "File deleted!"
+        removeFD yes fileDescription
+    deleteFileChunk :: XFTPClientAgent -> FileChunk -> ExceptT CLIError IO ()
+    deleteFileChunk a FileChunk {chunkNo, replicas = replica : _} = do
+      let FileChunkReplica {server, replicaId, replicaKey} = replica
+      withReconnect a server retryCount $ \c -> deleteXFTPChunk c replicaKey (unChunkReplicaId replicaId)
+      logInfo $ "deleted chunk " <> tshow chunkNo <> " from " <> showServer server
+    deleteFileChunk _ _ = throwError $ CLIError "chunk has no replicas"
+
+cliFileDescrInfo :: InfoOptions -> ExceptT CLIError IO ()
+cliFileDescrInfo InfoOptions {fileDescription} = do
+  getFileDescription fileDescription >>= \case
+    AVFD (ValidFileDescription FileDescription {party, size, chunkSize, chunks}) -> do
+      let replicas = groupReplicasByServer chunkSize chunks
+      liftIO $ do
+        printParty
+        putStrLn $ "File download size: " <> strEnc size
+        putStrLn "File server(s):"
+        forM_ replicas $ \srvReplicas -> do
+          let srv = replicaServer $ head srvReplicas
+              chSizes = map (\FileServerReplica {chunkSize = chSize_} -> unFileSize $ fromMaybe chunkSize chSize_) srvReplicas
+          putStrLn $ strEnc srv <> ": " <> strEnc (FileSize $ sum chSizes)
+      where
+        printParty :: IO ()
+        printParty = case party of
+          SFRecipient -> putStrLn "Recipient file description"
+          SFSender -> putStrLn "Sender file description"
+
+strEnc :: StrEncoding a => a -> String
+strEnc = B.unpack . strEncode
+
+getFileDescription :: FilePath -> ExceptT CLIError IO AValidFileDescription
+getFileDescription path =
+  ExceptT $ first (CLIError . ("Failed to parse file description: " <>)) . strDecode <$> B.readFile path
+
+getFileDescription' :: FilePartyI p => FilePath -> ExceptT CLIError IO (ValidFileDescription p)
+getFileDescription' path =
+  getFileDescription path >>= \case
+    AVFD fd -> either (throwError . CLIError) pure $ checkParty fd
+
+prepareChunkSizes :: Int64 -> [Word32]
+prepareChunkSizes size' = prepareSizes size'
+  where
+    (smallSize, bigSize) = if size' > size34 chunkSize3 then (chunkSize2, chunkSize3) else (chunkSize1, chunkSize2)
+    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 = fromIntegral 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
+
+withReconnect :: Show e => XFTPClientAgent -> XFTPServer -> Int -> (XFTPClient -> ExceptT e IO a) -> ExceptT CLIError IO a
+withReconnect a srv n run = withRetry n $ do
+  c <- withRetry n $ getXFTPServerClient a srv
+  withExceptT (CLIError . show) (run c) `catchError` \e -> do
+    liftIO $ closeXFTPServerClient a srv
+    throwError e
+
+withRetry :: Show e => Int -> ExceptT e IO a -> ExceptT CLIError IO a
+withRetry retryCount = withRetry' retryCount . withExceptT (CLIError . show)
+  where
+    withRetry' :: Int -> ExceptT CLIError IO a -> ExceptT CLIError IO a
+    withRetry' 0 _ = throwError $ CLIError "internal: no retry attempts"
+    withRetry' 1 a = a
+    withRetry' n a =
+      a `catchError` \e -> do
+        logWarn ("retrying: " <> tshow e)
+        withRetry' (n - 1) a
+
+removeFD :: Bool -> FilePath -> IO ()
+removeFD yes fd
+  | yes = do
+    removeFile fd
+    putStrLn $ "\nFile description " <> fd <> " is deleted."
+  | otherwise = do
+    y <- liftIO . getConfirmation $ "\nFile description " <> fd <> " can't be used again. Delete it"
+    when y $ removeFile fd
+
+getConfirmation :: String -> IO Bool
+getConfirmation prompt = do
+  putStr $ prompt <> " (Y/n): "
+  hFlush stdout
+  s <- getLine
+  case map toLower s of
+    "y" -> pure True
+    "" -> pure True
+    "n" -> pure False
+    _ -> getConfirmation prompt
+
+cliRandomFile :: RandomFileOptions -> IO ()
+cliRandomFile RandomFileOptions {filePath, fileSize = FileSize size} = do
+  withFile filePath WriteMode (`saveRandomFile` size)
+  putStrLn $ "File created: " <> filePath
+  where
+    saveRandomFile h sz = do
+      bytes <- getRandomBytes $ fromIntegral $ min mb' sz
+      B.hPut h bytes
+      when (sz > mb') $ saveRandomFile h (sz - mb')
+    mb' = mb 1

src/Simplex/FileTransfer/Client/Presets.hs

@@ -0,0 +1,17 @@
+{-# LANGUAGE OverloadedLists #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+module Simplex.FileTransfer.Client.Presets where
+
+import Data.List.NonEmpty (NonEmpty)
+import Simplex.Messaging.Protocol (XFTPServerWithAuth)
+
+defaultXFTPServers :: NonEmpty XFTPServerWithAuth
+defaultXFTPServers =
+  [ "xftp://da1aH3nOT-9G8lV7bWamhxpDYdJ1xmW7j3JpGaDR5Ug=@xftp1.simplex.im,blisztokwh6alt5oem45f2eksm2xdowxszmhjesntcyolmhutoon7sid.onion",
+    "xftp://5vog2Imy1ExJB_7zDZrkV1KDWi96jYFyy9CL6fndBVw=@xftp2.simplex.im,jk6jybnel5hin2am5omd7g3hyvb4tfkyl7ea4vx5ldi7gpvz5ogqtcqd.onion",
+    "xftp://PYa32DdYNFWi0uZZOprWQoQpIk5qyjRJ3EF7bVpbsn8=@xftp3.simplex.im,pqhchr4bpkzef5wra4hnmzvppn5j5mjrpzkh5ixx6mhylnxxd6lmwnad.onion",
+    "xftp://k_GgQl40UZVV0Y4BX9ZTyMVqX5ZewcLW0waQIl7AYDE=@xftp4.simplex.im,q2lrjgiyo2efyweksavwxh3dlsrxetaxjztde2x5nateugrtrwzvmdid.onion",
+    "xftp://-bIo6o8wuVc4wpZkZD3tH-rCeYaeER_0lz1ffQcSJDs=@xftp5.simplex.im,2kikdbdhlrluburwt6q6rnoxvezcm2ifx2hj463jlunkeftlzm7hf3qd.onion",
+    "xftp://6nSvtY9pJn6PXWTAIMNl95E1Kk1vD7FM2TeOA64CFLg=@xftp6.simplex.im,tg3fmu6houq7vfqlsipm2qqzhtpgxesnuydqozx3khojxydhs53sbbyd.onion"
+  ]

src/Simplex/FileTransfer/Crypto.hs

@@ -0,0 +1,115 @@
+{-# LANGUAGE BangPatterns #-}
+{-# LANGUAGE DeriveAnyClass #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+
+module Simplex.FileTransfer.Crypto where
+
+import Control.Monad.Except
+import qualified Data.Attoparsec.ByteString.Char8 as A
+import Data.Bifunctor (first)
+import qualified Data.ByteArray as BA
+import Data.ByteString.Char8 (ByteString)
+import qualified Data.ByteString.Char8 as B
+import qualified Data.ByteString.Lazy.Char8 as LB
+import Data.Int (Int64)
+import Simplex.FileTransfer.Types (FileHeader (..), authTagSize)
+import qualified Simplex.Messaging.Crypto as C
+import Simplex.Messaging.Crypto.Lazy (LazyByteString)
+import qualified Simplex.Messaging.Crypto.Lazy as LC
+import Simplex.Messaging.Encoding
+import Simplex.Messaging.Util (liftEitherWith)
+import UnliftIO
+import UnliftIO.Directory (removeFile)
+
+encryptFile :: FilePath -> ByteString -> C.SbKey -> C.CbNonce -> Int64 -> Int64 -> FilePath -> ExceptT FTCryptoError IO ()
+encryptFile filePath fileHdr key nonce fileSize' encSize encFile = do
+  sb <- liftEitherWith FTCECryptoError $ LC.sbInit key nonce
+  withFile filePath ReadMode $ \r -> withFile encFile WriteMode $ \w -> do
+    let lenStr = smpEncode fileSize'
+        (hdr, !sb') = LC.sbEncryptChunk sb $ lenStr <> fileHdr
+        padLen = encSize - authTagSize - fileSize' - 8
+    liftIO $ B.hPut w hdr
+    sb2 <- encryptChunks r w (sb', fileSize' - fromIntegral (B.length fileHdr))
+    sb3 <- encryptPad w (sb2, padLen)
+    let tag = BA.convert $ LC.sbAuth sb3
+    liftIO $ B.hPut w tag
+  where
+    encryptChunks r = encryptChunks_ $ liftIO . B.hGet r . fromIntegral
+    encryptPad = encryptChunks_ $ \sz -> pure $ B.replicate (fromIntegral sz) '#'
+    encryptChunks_ :: (Int64 -> IO ByteString) -> Handle -> (LC.SbState, Int64) -> ExceptT FTCryptoError IO LC.SbState
+    encryptChunks_ get w (!sb, !len)
+      | len == 0 = pure sb
+      | otherwise = do
+        let chSize = min len 65536
+        ch <- liftIO $ get chSize
+        when (B.length ch /= fromIntegral chSize) $ throwError $ FTCEFileIOError "encrypting file: unexpected EOF"
+        let (ch', sb') = LC.sbEncryptChunk sb ch
+        liftIO $ B.hPut w ch'
+        encryptChunks_ get w (sb', len - chSize)
+
+decryptChunks :: Int64 -> [FilePath] -> C.SbKey -> C.CbNonce -> (String -> ExceptT String IO String) -> ExceptT FTCryptoError IO FilePath
+decryptChunks _ [] _ _ _ = throwError $ FTCEInvalidHeader "empty"
+decryptChunks encSize (chPath : chPaths) key nonce getFilePath = case reverse chPaths of
+  [] -> do
+    (!authOk, !f) <- liftEither . first FTCECryptoError . LC.sbDecryptTailTag key nonce (encSize - authTagSize) =<< liftIO (LB.readFile chPath)
+    unless authOk $ throwError FTCEInvalidAuthTag
+    (FileHeader {fileName}, !f') <- parseFileHeader f
+    path <- withExceptT FTCEFileIOError $ getFilePath fileName
+    liftIO $ LB.writeFile path f'
+    pure path
+  lastPath : chPaths' -> do
+    (state, expectedLen, ch) <- decryptFirstChunk
+    (FileHeader {fileName}, ch') <- parseFileHeader ch
+    path <- withExceptT FTCEFileIOError $ getFilePath fileName
+    authOk <- liftIO . withFile path WriteMode $ \h -> do
+      liftIO $ LB.hPut h ch'
+      state' <- foldM (decryptChunk h) state $ reverse chPaths'
+      decryptLastChunk h state' expectedLen
+    unless authOk $ do
+      removeFile path
+      throwError FTCEInvalidAuthTag
+    pure path
+    where
+      decryptFirstChunk = do
+        sb <- liftEitherWith FTCECryptoError $ LC.sbInit key nonce
+        ch <- liftIO $ LB.readFile chPath
+        let (ch1, !sb') = LC.sbDecryptChunkLazy sb ch
+        (!expectedLen, ch2) <- liftEitherWith FTCECryptoError $ LC.splitLen ch1
+        let len1 = LB.length ch2
+        pure ((sb', len1), expectedLen, ch2)
+      decryptChunk h (!sb, !len) chPth = do
+        ch <- LB.readFile chPth
+        let len' = len + LB.length ch
+            (ch', sb') = LC.sbDecryptChunkLazy sb ch
+        LB.hPut h ch'
+        pure (sb', len')
+      decryptLastChunk h (!sb, !len) expectedLen = do
+        ch <- LB.readFile lastPath
+        let (ch1, tag') = LB.splitAt (LB.length ch - authTagSize) ch
+            tag'' = LB.toStrict tag'
+            (ch2, sb') = LC.sbDecryptChunkLazy sb ch1
+            len' = len + LB.length ch2
+            ch3 = LB.take (LB.length ch2 - len' + expectedLen) ch2
+            tag :: ByteString = BA.convert (LC.sbAuth sb')
+        LB.hPut h ch3
+        pure $ B.length tag'' == 16 && BA.constEq tag'' tag
+  where
+    parseFileHeader :: LazyByteString -> ExceptT FTCryptoError IO (FileHeader, LazyByteString)
+    parseFileHeader s = do
+      let (hdrStr, s') = LB.splitAt 1024 s
+      case A.parse smpP $ LB.toStrict hdrStr of
+        A.Fail _ _ e -> throwError $ FTCEInvalidHeader e
+        A.Partial _ -> throwError $ FTCEInvalidHeader "incomplete"
+        A.Done rest hdr -> pure (hdr, LB.fromStrict rest <> s')
+
+readChunks :: [FilePath] -> IO LB.ByteString
+readChunks = foldM (\s path -> (s <>) <$> LB.readFile path) ""
+
+data FTCryptoError
+  = FTCECryptoError C.CryptoError
+  | FTCEInvalidHeader String
+  | FTCEInvalidAuthTag
+  | FTCEFileIOError String
+  deriving (Show, Eq, Exception)

src/Simplex/FileTransfer/Description.hs

@@ -0,0 +1,356 @@
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE DeriveAnyClass #-}
+{-# LANGUAGE DeriveGeneric #-}
+{-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE GADTs #-}
+{-# LANGUAGE KindSignatures #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE PatternSynonyms #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+
+module Simplex.FileTransfer.Description
+  ( FileDescription (..),
+    AFileDescription (..),
+    ValidFileDescription, -- constructor is not exported, use pattern
+    pattern ValidFileDescription,
+    AValidFileDescription (..),
+    FileDigest (..),
+    FileChunk (..),
+    FileChunkReplica (..),
+    FileServerReplica (..),
+    FileSize (..),
+    ChunkReplicaId (..),
+    YAMLFileDescription (..), -- for tests
+    YAMLServerReplicas (..), -- for tests
+    validateFileDescription,
+    groupReplicasByServer,
+    replicaServer,
+    fdSeparator,
+    kb,
+    mb,
+    gb,
+  )
+where
+
+import Control.Applicative (optional)
+import Control.Monad ((<=<))
+import Data.Aeson (FromJSON, ToJSON)
+import qualified Data.Aeson as J
+import Data.Attoparsec.ByteString.Char8 (Parser)
+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 Data.Int (Int64)
+import Data.List (foldl', sortOn)
+import Data.Map (Map)
+import qualified Data.Map as M
+import Data.Maybe (fromMaybe)
+import Data.String
+import Data.Word (Word32)
+import qualified Data.Yaml as Y
+import Database.SQLite.Simple.FromField (FromField (..))
+import Database.SQLite.Simple.ToField (ToField (..))
+import GHC.Generics (Generic)
+import Simplex.FileTransfer.Protocol
+import qualified Simplex.Messaging.Crypto as C
+import Simplex.Messaging.Encoding.String
+import Simplex.Messaging.Parsers (parseAll)
+import Simplex.Messaging.Protocol (XFTPServer)
+import Simplex.Messaging.Util (bshow, groupAllOn, (<$?>))
+
+data FileDescription (p :: FileParty) = FileDescription
+  { party :: SFileParty p,
+    size :: FileSize Int64,
+    digest :: FileDigest,
+    key :: C.SbKey,
+    nonce :: C.CbNonce,
+    chunkSize :: FileSize Word32,
+    chunks :: [FileChunk]
+  }
+  deriving (Eq, Show)
+
+data AFileDescription = forall p. FilePartyI p => AFD (FileDescription p)
+
+newtype ValidFileDescription p = ValidFD (FileDescription p)
+  deriving (Eq, Show)
+
+pattern ValidFileDescription :: FileDescription p -> ValidFileDescription p
+pattern ValidFileDescription fd = ValidFD fd
+
+{-# COMPLETE ValidFileDescription #-}
+
+data AValidFileDescription = forall p. FilePartyI p => AVFD (ValidFileDescription p)
+
+fdSeparator :: IsString s => s
+fdSeparator = "################################\n"
+
+newtype FileDigest = FileDigest {unFileDigest :: ByteString}
+  deriving (Eq, Show)
+
+instance StrEncoding FileDigest where
+  strEncode (FileDigest fd) = strEncode fd
+  strDecode s = FileDigest <$> strDecode s
+  strP = FileDigest <$> strP
+
+instance FromJSON FileDigest where
+  parseJSON = strParseJSON "FileDigest"
+
+instance ToJSON FileDigest where
+  toJSON = strToJSON
+  toEncoding = strToJEncoding
+
+instance FromField FileDigest where fromField f = FileDigest <$> fromField f
+
+instance ToField FileDigest where toField (FileDigest s) = toField s
+
+data FileChunk = FileChunk
+  { chunkNo :: Int,
+    chunkSize :: FileSize Word32,
+    digest :: FileDigest,
+    replicas :: [FileChunkReplica]
+  }
+  deriving (Eq, Show)
+
+data FileChunkReplica = FileChunkReplica
+  { server :: XFTPServer,
+    replicaId :: ChunkReplicaId,
+    replicaKey :: C.APrivateSignKey
+  }
+  deriving (Eq, Show)
+
+newtype ChunkReplicaId = ChunkReplicaId {unChunkReplicaId :: ByteString}
+  deriving (Eq, Show)
+
+instance StrEncoding ChunkReplicaId where
+  strEncode (ChunkReplicaId fid) = strEncode fid
+  strP = ChunkReplicaId <$> strP
+
+instance FromJSON ChunkReplicaId where
+  parseJSON = strParseJSON "ChunkReplicaId"
+
+instance ToJSON ChunkReplicaId where
+  toJSON = strToJSON
+  toEncoding = strToJEncoding
+
+instance FromField ChunkReplicaId where fromField f = ChunkReplicaId <$> fromField f
+
+instance ToField ChunkReplicaId where toField (ChunkReplicaId s) = toField s
+
+data YAMLFileDescription = YAMLFileDescription
+  { party :: FileParty,
+    size :: String,
+    digest :: FileDigest,
+    key :: C.SbKey,
+    nonce :: C.CbNonce,
+    chunkSize :: String,
+    replicas :: [YAMLServerReplicas]
+  }
+  deriving (Eq, Show, Generic, FromJSON)
+
+instance ToJSON YAMLFileDescription where
+  toJSON = J.genericToJSON J.defaultOptions
+  toEncoding = J.genericToEncoding J.defaultOptions
+
+data YAMLServerReplicas = YAMLServerReplicas
+  { server :: XFTPServer,
+    chunks :: [String]
+  }
+  deriving (Eq, Show, Generic, FromJSON)
+
+instance ToJSON YAMLServerReplicas where
+  toJSON = J.genericToJSON J.defaultOptions
+  toEncoding = J.genericToEncoding J.defaultOptions
+
+data FileServerReplica = FileServerReplica
+  { chunkNo :: Int,
+    server :: XFTPServer,
+    replicaId :: ChunkReplicaId,
+    replicaKey :: C.APrivateSignKey,
+    digest :: Maybe FileDigest,
+    chunkSize :: Maybe (FileSize Word32)
+  }
+  deriving (Show)
+
+instance FilePartyI p => StrEncoding (ValidFileDescription p) where
+  strEncode (ValidFD fd) = strEncode fd
+  strDecode s = strDecode s >>= (\(AVFD fd) -> checkParty fd)
+  strP = strDecode <$?> A.takeByteString
+
+instance StrEncoding AValidFileDescription where
+  strEncode (AVFD fd) = strEncode fd
+  strDecode = (\(AFD fd) -> AVFD <$> validateFileDescription fd) <=< strDecode
+  strP = strDecode <$?> A.takeByteString
+
+instance FilePartyI p => StrEncoding (FileDescription p) where
+  strEncode = Y.encode . encodeFileDescription
+  strDecode s = strDecode s >>= (\(AFD fd) -> checkParty fd)
+  strP = strDecode <$?> A.takeByteString
+
+instance StrEncoding AFileDescription where
+  strEncode (AFD fd) = strEncode fd
+  strDecode = decodeFileDescription <=< first show . Y.decodeEither'
+  strP = strDecode <$?> A.takeByteString
+
+validateFileDescription :: FileDescription p -> Either String (ValidFileDescription p)
+validateFileDescription fd@FileDescription {size, chunks}
+  | chunkNos /= [1 .. length chunks] = Left "chunk numbers are not sequential"
+  | chunksSize chunks /= unFileSize size = Left "chunks total size is different than file size"
+  | otherwise = Right $ ValidFD fd
+  where
+    chunkNos = map (chunkNo :: FileChunk -> Int) chunks
+    chunksSize = fromIntegral . foldl' (\s FileChunk {chunkSize} -> s + unFileSize chunkSize) 0
+
+encodeFileDescription :: FileDescription p -> YAMLFileDescription
+encodeFileDescription FileDescription {party, size, digest, key, nonce, chunkSize, chunks} =
+  YAMLFileDescription
+    { party = toFileParty party,
+      size = B.unpack $ strEncode size,
+      digest,
+      key,
+      nonce,
+      chunkSize = B.unpack $ strEncode chunkSize,
+      replicas = encodeFileReplicas chunkSize chunks
+    }
+
+newtype FileSize a = FileSize {unFileSize :: a}
+  deriving (Eq, Show)
+
+instance (Integral a, Show a) => StrEncoding (FileSize a) where
+  strEncode (FileSize b)
+    | b' /= 0 = bshow b
+    | ks' /= 0 = bshow ks <> "kb"
+    | ms' /= 0 = bshow ms <> "mb"
+    | otherwise = bshow gs <> "gb"
+    where
+      (ks, b') = b `divMod` 1024
+      (ms, ks') = ks `divMod` 1024
+      (gs, ms') = ms `divMod` 1024
+  strP =
+    FileSize
+      <$> A.choice
+        [ gb <$> A.decimal <* "gb",
+          mb <$> A.decimal <* "mb",
+          kb <$> A.decimal <* "kb",
+          A.decimal
+        ]
+
+kb :: Integral a => a -> a
+kb n = 1024 * n
+{-# INLINE kb #-}
+
+mb :: Integral a => a -> a
+mb n = 1024 * kb n
+{-# INLINE mb #-}
+
+gb :: Integral a => a -> a
+gb n = 1024 * mb n
+{-# INLINE gb #-}
+
+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
+
+instance (ToField a) => ToField (FileSize a) where toField (FileSize s) = toField s
+
+groupReplicasByServer :: FileSize Word32 -> [FileChunk] -> [[FileServerReplica]]
+groupReplicasByServer defChunkSize =
+  groupAllOn replicaServer . unfoldChunksToReplicas defChunkSize
+
+encodeFileReplicas :: FileSize Word32 -> [FileChunk] -> [YAMLServerReplicas]
+encodeFileReplicas defChunkSize =
+  map encodeServerReplicas . groupReplicasByServer defChunkSize
+  where
+    encodeServerReplicas fs =
+      YAMLServerReplicas
+        { server = replicaServer $ head fs, -- groupAllOn guarantees that fs is not empty
+          chunks = map (B.unpack . encodeServerReplica) fs
+        }
+
+replicaServer :: FileServerReplica -> XFTPServer
+replicaServer = server
+
+encodeServerReplica :: FileServerReplica -> ByteString
+encodeServerReplica FileServerReplica {chunkNo, replicaId, replicaKey, digest, chunkSize} =
+  bshow chunkNo
+    <> ":"
+    <> strEncode replicaId
+    <> ":"
+    <> strEncode replicaKey
+    <> maybe "" ((":" <>) . strEncode) digest
+    <> maybe "" ((":" <>) . strEncode) chunkSize
+
+serverReplicaP :: XFTPServer -> Parser FileServerReplica
+serverReplicaP server = do
+  chunkNo <- A.decimal
+  replicaId <- A.char ':' *> strP
+  replicaKey <- A.char ':' *> strP
+  digest <- optional (A.char ':' *> strP)
+  chunkSize <- optional (A.char ':' *> strP)
+  pure FileServerReplica {chunkNo, server, replicaId, replicaKey, digest, chunkSize}
+
+unfoldChunksToReplicas :: FileSize Word32 -> [FileChunk] -> [FileServerReplica]
+unfoldChunksToReplicas defChunkSize = concatMap chunkReplicas
+  where
+    chunkReplicas c@FileChunk {replicas} = zipWith (replicaToServerReplica c) [1 ..] replicas
+    replicaToServerReplica :: FileChunk -> Int -> FileChunkReplica -> FileServerReplica
+    replicaToServerReplica FileChunk {chunkNo, digest, chunkSize} replicaNo FileChunkReplica {server, replicaId, replicaKey} =
+      let chunkSize' = if chunkSize /= defChunkSize && replicaNo == 1 then Just chunkSize else Nothing
+          digest' = if replicaNo == 1 then Just digest else Nothing
+       in FileServerReplica {chunkNo, server, replicaId, replicaKey, digest = digest', chunkSize = chunkSize'}
+
+decodeFileDescription :: YAMLFileDescription -> Either String AFileDescription
+decodeFileDescription YAMLFileDescription {party, size, digest, key, nonce, chunkSize, replicas} = do
+  size' <- strDecode $ B.pack size
+  chunkSize' <- strDecode $ B.pack chunkSize
+  replicas' <- decodeFileParts replicas
+  chunks <- foldReplicasToChunks chunkSize' replicas'
+  pure $ case aFileParty party of
+    AFP party' -> AFD FileDescription {party = party', size = size', digest, key, nonce, chunkSize = chunkSize', chunks}
+  where
+    decodeFileParts = fmap concat . mapM decodeYAMLServerReplicas
+
+decodeYAMLServerReplicas :: YAMLServerReplicas -> Either String [FileServerReplica]
+decodeYAMLServerReplicas YAMLServerReplicas {server, chunks} =
+  mapM (parseAll (serverReplicaP server) . B.pack) chunks
+
+-- this function should fail if:
+-- 1. no replica has digest or two replicas have different digests
+-- 2. two replicas have different chunk sizes
+foldReplicasToChunks :: FileSize Word32 -> [FileServerReplica] -> Either String [FileChunk]
+foldReplicasToChunks defChunkSize fs = do
+  sd <- foldSizesDigests fs
+  -- TODO validate (check that chunks match) or in separate function
+  sortOn (chunkNo :: FileChunk -> Int) . map reverseReplicas . M.elems <$> foldChunks sd fs
+  where
+    foldSizesDigests :: [FileServerReplica] -> Either String (Map Int (FileSize Word32), Map Int FileDigest)
+    foldSizesDigests = foldl' addSizeDigest $ Right (M.empty, M.empty)
+    addSizeDigest :: Either String (Map Int (FileSize Word32), Map Int FileDigest) -> FileServerReplica -> Either String (Map Int (FileSize Word32), Map Int FileDigest)
+    addSizeDigest (Left e) _ = Left e
+    addSizeDigest (Right (ms, md)) FileServerReplica {chunkNo, chunkSize, digest} =
+      (,) <$> combineChunk ms chunkNo chunkSize <*> combineChunk md chunkNo digest
+    combineChunk :: Eq a => Map Int a -> Int -> Maybe a -> Either String (Map Int a)
+    combineChunk m _ Nothing = Right m
+    combineChunk m chunkNo (Just value) = case M.lookup chunkNo m of
+      Nothing -> Right $ M.insert chunkNo value m
+      Just v -> if v == value then Right m else Left "different size or digest in chunk replicas"
+    foldChunks :: (Map Int (FileSize Word32), Map Int FileDigest) -> [FileServerReplica] -> Either String (Map Int FileChunk)
+    foldChunks sd = foldl' (addReplica sd) (Right M.empty)
+    addReplica :: (Map Int (FileSize Word32), Map Int FileDigest) -> Either String (Map Int FileChunk) -> FileServerReplica -> Either String (Map Int FileChunk)
+    addReplica _ (Left e) _ = Left e
+    addReplica (ms, md) (Right cs) FileServerReplica {chunkNo, server, replicaId, replicaKey} = do
+      case M.lookup chunkNo cs of
+        Just chunk@FileChunk {replicas} ->
+          let replica = FileChunkReplica {server, replicaId, replicaKey}
+           in Right $ M.insert chunkNo ((chunk :: FileChunk) {replicas = replica : replicas}) cs
+        _ -> do
+          case M.lookup chunkNo md of
+            Just digest' ->
+              let replica = FileChunkReplica {server, replicaId, replicaKey}
+                  chunkSize' = fromMaybe defChunkSize $ M.lookup chunkNo ms
+                  chunk = FileChunk {chunkNo, digest = digest', chunkSize = chunkSize', replicas = [replica]}
+               in Right $ M.insert chunkNo chunk cs
+            _ -> Left "no digest for chunk"
+    reverseReplicas c@FileChunk {replicas} = (c :: FileChunk) {replicas = reverse replicas}

src/Simplex/FileTransfer/Protocol.hs

@@ -0,0 +1,434 @@
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE DeriveGeneric #-}
+{-# LANGUAGE GADTs #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE StandaloneDeriving #-}
+{-# LANGUAGE TypeApplications #-}
+{-# LANGUAGE TypeFamilies #-}
+{-# OPTIONS_GHC -fno-warn-unticked-promoted-constructors #-}
+
+module Simplex.FileTransfer.Protocol where
+
+import Control.Applicative ((<|>))
+import Data.Aeson (FromJSON, ToJSON)
+import qualified Data.Aeson as J
+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 Data.Kind (Type)
+import Data.List.NonEmpty (NonEmpty (..))
+import Data.Maybe (isNothing)
+import Data.Type.Equality
+import Data.Word (Word32)
+import GHC.Generics (Generic)
+import Generic.Random (genericArbitraryU)
+import qualified Simplex.Messaging.Crypto as C
+import Simplex.Messaging.Encoding
+import Simplex.Messaging.Encoding.String
+import Simplex.Messaging.Notifications.Transport (ntfClientHandshake)
+import Simplex.Messaging.Parsers
+import Simplex.Messaging.Protocol
+  ( BasicAuth,
+    CommandError (..),
+    Protocol (..),
+    ProtocolEncoding (..),
+    ProtocolErrorType (..),
+    ProtocolMsgTag (..),
+    ProtocolType (..),
+    RcvPublicDhKey,
+    RcvPublicVerifyKey,
+    RecipientId,
+    SenderId,
+    SentRawTransmission,
+    SignedTransmission,
+    SndPublicVerifyKey,
+    Transmission,
+    encodeTransmission,
+    messageTagP,
+    tDecodeParseValidate,
+    tEncode,
+    tEncodeBatch,
+    tParse,
+    _smpP,
+  )
+import Simplex.Messaging.Transport (SessionId, TransportError (..))
+import Simplex.Messaging.Util (bshow, (<$?>))
+import Simplex.Messaging.Version
+import Test.QuickCheck (Arbitrary (..))
+
+currentXFTPVersion :: Version
+currentXFTPVersion = 1
+
+xftpBlockSize :: Int
+xftpBlockSize = 16384
+
+-- | File protocol clients
+data FileParty = FRecipient | FSender
+  deriving (Eq, Show, Generic)
+
+instance FromJSON FileParty where
+  parseJSON = J.genericParseJSON . enumJSON $ dropPrefix "F"
+
+instance ToJSON FileParty where
+  toJSON = J.genericToJSON . enumJSON $ dropPrefix "F"
+  toEncoding = J.genericToEncoding . enumJSON $ dropPrefix "F"
+
+data SFileParty :: FileParty -> Type where
+  SFRecipient :: SFileParty FRecipient
+  SFSender :: SFileParty FSender
+
+instance TestEquality SFileParty where
+  testEquality SFRecipient SFRecipient = Just Refl
+  testEquality SFSender SFSender = Just Refl
+  testEquality _ _ = Nothing
+
+deriving instance Eq (SFileParty p)
+
+deriving instance Show (SFileParty p)
+
+data AFileParty = forall p. FilePartyI p => AFP (SFileParty p)
+
+toFileParty :: SFileParty p -> FileParty
+toFileParty = \case
+  SFRecipient -> FRecipient
+  SFSender -> FSender
+
+aFileParty :: FileParty -> AFileParty
+aFileParty = \case
+  FRecipient -> AFP SFRecipient
+  FSender -> AFP SFSender
+
+class FilePartyI (p :: FileParty) where sFileParty :: SFileParty p
+
+instance FilePartyI FRecipient where sFileParty = SFRecipient
+
+instance FilePartyI FSender where sFileParty = SFSender
+
+data FileCommandTag (p :: FileParty) where
+  FNEW_ :: FileCommandTag FSender
+  FADD_ :: FileCommandTag FSender
+  FPUT_ :: FileCommandTag FSender
+  FDEL_ :: FileCommandTag FSender
+  FGET_ :: FileCommandTag FRecipient
+  FACK_ :: FileCommandTag FRecipient
+  PING_ :: FileCommandTag FRecipient
+
+deriving instance Show (FileCommandTag p)
+
+data FileCmdTag = forall p. FilePartyI p => FCT (SFileParty p) (FileCommandTag p)
+
+instance FilePartyI p => Encoding (FileCommandTag p) where
+  smpEncode = \case
+    FNEW_ -> "FNEW"
+    FADD_ -> "FADD"
+    FPUT_ -> "FPUT"
+    FDEL_ -> "FDEL"
+    FGET_ -> "FGET"
+    FACK_ -> "FACK"
+    PING_ -> "PING"
+  smpP = messageTagP
+
+instance Encoding FileCmdTag where
+  smpEncode (FCT _ t) = smpEncode t
+  smpP = messageTagP
+
+instance ProtocolMsgTag FileCmdTag where
+  decodeTag = \case
+    "FNEW" -> Just $ FCT SFSender FNEW_
+    "FADD" -> Just $ FCT SFSender FADD_
+    "FPUT" -> Just $ FCT SFSender FPUT_
+    "FDEL" -> Just $ FCT SFSender FDEL_
+    "FGET" -> Just $ FCT SFRecipient FGET_
+    "FACK" -> Just $ FCT SFRecipient FACK_
+    "PING" -> Just $ FCT SFRecipient PING_
+    _ -> Nothing
+
+instance FilePartyI p => ProtocolMsgTag (FileCommandTag p) where
+  decodeTag s = decodeTag s >>= (\(FCT _ t) -> checkParty' t)
+
+instance Protocol XFTPErrorType FileResponse where
+  type ProtoCommand FileResponse = FileCmd
+  type ProtoType FileResponse = 'PXFTP
+  protocolClientHandshake = ntfClientHandshake
+  protocolPing = FileCmd SFRecipient PING
+  protocolError = \case
+    FRErr e -> Just e
+    _ -> Nothing
+
+data FileCommand (p :: FileParty) where
+  FNEW :: FileInfo -> NonEmpty RcvPublicVerifyKey -> Maybe BasicAuth -> FileCommand FSender
+  FADD :: NonEmpty RcvPublicVerifyKey -> FileCommand FSender
+  FPUT :: FileCommand FSender
+  FDEL :: FileCommand FSender
+  FGET :: RcvPublicDhKey -> FileCommand FRecipient
+  FACK :: FileCommand FRecipient
+  PING :: FileCommand FRecipient
+
+deriving instance Show (FileCommand p)
+
+data FileCmd = forall p. FilePartyI p => FileCmd (SFileParty p) (FileCommand p)
+
+deriving instance Show FileCmd
+
+data FileInfo = FileInfo
+  { sndKey :: SndPublicVerifyKey,
+    size :: Word32,
+    digest :: ByteString
+  }
+  deriving (Eq, Show)
+
+type XFTPFileId = ByteString
+
+instance FilePartyI p => ProtocolEncoding XFTPErrorType (FileCommand p) where
+  type Tag (FileCommand p) = FileCommandTag p
+  encodeProtocol _v = \case
+    FNEW file rKeys auth_ -> e (FNEW_, ' ', file, rKeys, auth_)
+    FADD rKeys -> e (FADD_, ' ', rKeys)
+    FPUT -> e FPUT_
+    FDEL -> e FDEL_
+    FGET rKey -> e (FGET_, ' ', rKey)
+    FACK -> e FACK_
+    PING -> e PING_
+    where
+      e :: Encoding a => a -> ByteString
+      e = smpEncode
+
+  protocolP v tag = (\(FileCmd _ c) -> checkParty c) <$?> protocolP v (FCT (sFileParty @p) tag)
+
+  fromProtocolError = fromProtocolError @XFTPErrorType @FileResponse
+  {-# INLINE fromProtocolError #-}
+
+  checkCredentials (sig, _, fileId, _) cmd = case cmd of
+    -- FNEW must not have signature and chunk ID
+    FNEW {}
+      | isNothing sig -> Left $ CMD NO_AUTH
+      | not (B.null fileId) -> Left $ CMD HAS_AUTH
+      | otherwise -> Right cmd
+    PING
+      | isNothing sig && B.null fileId -> Right cmd
+      | otherwise -> Left $ CMD HAS_AUTH
+    -- other client commands must have both signature and queue ID
+    _
+      | isNothing sig || B.null fileId -> Left $ CMD NO_AUTH
+      | otherwise -> Right cmd
+
+instance ProtocolEncoding XFTPErrorType FileCmd where
+  type Tag FileCmd = FileCmdTag
+  encodeProtocol _v (FileCmd _ c) = encodeProtocol _v c
+
+  protocolP _v = \case
+    FCT SFSender tag ->
+      FileCmd SFSender <$> case tag of
+        FNEW_ -> FNEW <$> _smpP <*> smpP <*> smpP
+        FADD_ -> FADD <$> _smpP
+        FPUT_ -> pure FPUT
+        FDEL_ -> pure FDEL
+    FCT SFRecipient tag ->
+      FileCmd SFRecipient <$> case tag of
+        FGET_ -> FGET <$> _smpP
+        FACK_ -> pure FACK
+        PING_ -> pure PING
+
+  fromProtocolError = fromProtocolError @XFTPErrorType @FileResponse
+  {-# INLINE fromProtocolError #-}
+
+  checkCredentials t (FileCmd p c) = FileCmd p <$> checkCredentials t c
+
+instance Encoding FileInfo where
+  smpEncode FileInfo {sndKey, size, digest} = smpEncode (sndKey, size, digest)
+  smpP = FileInfo <$> smpP <*> smpP <*> smpP
+
+instance StrEncoding FileInfo where
+  strEncode FileInfo {sndKey, size, digest} = strEncode (sndKey, size, digest)
+  strP = FileInfo <$> strP_ <*> strP_ <*> strP
+
+data FileResponseTag
+  = FRSndIds_
+  | FRRcvIds_
+  | FRFile_
+  | FROk_
+  | FRErr_
+  | FRPong_
+  deriving (Show)
+
+instance Encoding FileResponseTag where
+  smpEncode = \case
+    FRSndIds_ -> "SIDS"
+    FRRcvIds_ -> "RIDS"
+    FRFile_ -> "FILE"
+    FROk_ -> "OK"
+    FRErr_ -> "ERR"
+    FRPong_ -> "PONG"
+  smpP = messageTagP
+
+instance ProtocolMsgTag FileResponseTag where
+  decodeTag = \case
+    "SIDS" -> Just FRSndIds_
+    "RIDS" -> Just FRRcvIds_
+    "FILE" -> Just FRFile_
+    "OK" -> Just FROk_
+    "ERR" -> Just FRErr_
+    "PONG" -> Just FRPong_
+    _ -> Nothing
+
+data FileResponse
+  = FRSndIds SenderId (NonEmpty RecipientId)
+  | FRRcvIds (NonEmpty RecipientId)
+  | FRFile RcvPublicDhKey C.CbNonce
+  | FROk
+  | FRErr XFTPErrorType
+  | FRPong
+  deriving (Show)
+
+instance ProtocolEncoding XFTPErrorType FileResponse where
+  type Tag FileResponse = FileResponseTag
+  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)
+    FRPong -> e FRPong_
+    where
+      e :: Encoding a => a -> ByteString
+      e = smpEncode
+
+  protocolP _v = \case
+    FRSndIds_ -> FRSndIds <$> _smpP <*> smpP
+    FRRcvIds_ -> FRRcvIds <$> _smpP
+    FRFile_ -> FRFile <$> _smpP <*> smpP
+    FROk_ -> pure FROk
+    FRErr_ -> FRErr <$> _smpP
+    FRPong_ -> pure FRPong
+
+  fromProtocolError = \case
+    PECmdSyntax -> CMD SYNTAX
+    PECmdUnknown -> CMD UNKNOWN
+    PESession -> SESSION
+    PEBlock -> BLOCK
+  {-# INLINE fromProtocolError #-}
+
+  checkCredentials (_, _, entId, _) cmd = case cmd of
+    FRSndIds {} -> noEntity
+    -- ERR response does not always have entity ID
+    FRErr _ -> Right cmd
+    -- PONG response must not have queue ID
+    FRPong -> noEntity
+    -- other server responses must have entity ID
+    _
+      | B.null entId -> Left $ CMD NO_ENTITY
+      | otherwise -> Right cmd
+    where
+      noEntity
+        | B.null entId = Right cmd
+        | otherwise = Left $ CMD HAS_AUTH
+
+data XFTPErrorType
+  = -- | incorrect block format, encoding or signature size
+    BLOCK
+  | -- | incorrect SMP session ID (TLS Finished message / tls-unique binding RFC5929)
+    SESSION
+  | -- | SMP command is unknown or has invalid syntax
+    CMD {cmdErr :: CommandError}
+  | -- | command authorization error - bad signature or non-existing SMP queue
+    AUTH
+  | -- | incorrent file size
+    SIZE
+  | -- | storage quota exceeded
+    QUOTA
+  | -- | incorrent file digest
+    DIGEST
+  | -- | file encryption/decryption failed
+    CRYPTO
+  | -- | no expected file body in request/response or no file on the server
+    NO_FILE
+  | -- | unexpected file body
+    HAS_FILE
+  | -- | file IO error
+    FILE_IO
+  | -- | internal server error
+    INTERNAL
+  | -- | used internally, never returned by the server (to be removed)
+    DUPLICATE_ -- not part of SMP protocol, used internally
+  deriving (Eq, Generic, Read, Show)
+
+instance ToJSON XFTPErrorType where
+  toJSON = J.genericToJSON $ sumTypeJSON id
+  toEncoding = J.genericToEncoding $ sumTypeJSON id
+
+instance StrEncoding XFTPErrorType where
+  strEncode = \case
+    CMD e -> "CMD " <> bshow e
+    e -> bshow e
+  strP = "CMD " *> (CMD <$> parseRead1) <|> parseRead1
+
+instance Arbitrary XFTPErrorType where arbitrary = genericArbitraryU
+
+instance Encoding XFTPErrorType where
+  smpEncode = \case
+    BLOCK -> "BLOCK"
+    SESSION -> "SESSION"
+    CMD err -> "CMD " <> smpEncode err
+    AUTH -> "AUTH"
+    SIZE -> "SIZE"
+    QUOTA -> "QUOTA"
+    DIGEST -> "DIGEST"
+    CRYPTO -> "CRYPTO"
+    NO_FILE -> "NO_FILE"
+    HAS_FILE -> "HAS_FILE"
+    FILE_IO -> "FILE_IO"
+    INTERNAL -> "INTERNAL"
+    DUPLICATE_ -> "DUPLICATE_"
+
+  smpP =
+    A.takeTill (== ' ') >>= \case
+      "BLOCK" -> pure BLOCK
+      "SESSION" -> pure SESSION
+      "CMD" -> CMD <$> _smpP
+      "AUTH" -> pure AUTH
+      "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
+      "INTERNAL" -> pure INTERNAL
+      "DUPLICATE_" -> pure DUPLICATE_
+      _ -> fail "bad error type"
+
+checkParty :: forall t p p'. (FilePartyI p, FilePartyI p') => t p' -> Either String (t p)
+checkParty c = case testEquality (sFileParty @p) (sFileParty @p') of
+  Just Refl -> Right c
+  Nothing -> Left "incorrect XFTP party"
+
+checkParty' :: forall t p p'. (FilePartyI p, FilePartyI p') => t p' -> Maybe (t p)
+checkParty' c = case testEquality (sFileParty @p) (sFileParty @p') of
+  Just Refl -> Just c
+  _ -> Nothing
+
+xftpEncodeTransmission :: ProtocolEncoding e c => SessionId -> Maybe C.APrivateSignKey -> Transmission c -> Either TransportError ByteString
+xftpEncodeTransmission sessionId pKey (corrId, fId, msg) = do
+  let t = encodeTransmission currentXFTPVersion sessionId (corrId, fId, msg)
+  xftpEncodeBatch1 $ signTransmission t
+  where
+    signTransmission :: ByteString -> SentRawTransmission
+    signTransmission t = ((`C.sign` t) <$> pKey, t)
+
+-- this function uses batch syntax but puts only one transmission in the batch
+xftpEncodeBatch1 :: (Maybe C.ASignature, ByteString) -> Either TransportError ByteString
+xftpEncodeBatch1 (sig, t) =
+  let t' = tEncodeBatch 1 . smpEncode . Large $ tEncode (sig, t)
+   in first (const TELargeMsg) $ C.pad t' xftpBlockSize
+
+xftpDecodeTransmission :: ProtocolEncoding e c => SessionId -> ByteString -> Either XFTPErrorType (SignedTransmission e c)
+xftpDecodeTransmission sessionId t = do
+  t' <- first (const BLOCK) $ C.unPad t
+  case tParse True t' of
+    t'' :| [] -> Right $ tDecodeParseValidate sessionId currentXFTPVersion t''
+    _ -> Left BLOCK

src/Simplex/FileTransfer/Server.hs

@@ -0,0 +1,403 @@
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE FlexibleContexts #-}
+{-# LANGUAGE GADTs #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE NumericUnderscores #-}
+{-# LANGUAGE OverloadedLists #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+
+module Simplex.FileTransfer.Server where
+
+import Control.Logger.Simple
+import Control.Monad.Except
+import Control.Monad.IO.Unlift (MonadUnliftIO)
+import Control.Monad.Reader
+import Crypto.Random (getRandomBytes)
+import Data.Bifunctor (first)
+import qualified Data.ByteString.Base64.URL as B64
+import Data.ByteString.Builder (byteString)
+import Data.ByteString.Char8 (ByteString)
+import qualified Data.ByteString.Char8 as B
+import Data.Functor (($>))
+import Data.Int (Int64)
+import Data.List (intercalate)
+import Data.List.NonEmpty (NonEmpty)
+import qualified Data.List.NonEmpty as L
+import qualified Data.Map.Strict as M
+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 Network.HTTP.Types as N
+import qualified Network.HTTP2.Server as H
+import Simplex.FileTransfer.Protocol
+import Simplex.FileTransfer.Server.Env
+import Simplex.FileTransfer.Server.Stats
+import Simplex.FileTransfer.Server.Store
+import Simplex.FileTransfer.Server.StoreLog
+import Simplex.FileTransfer.Transport
+import qualified Simplex.Messaging.Crypto as C
+import qualified Simplex.Messaging.Crypto.Lazy as LC
+import Simplex.Messaging.Encoding.String
+import Simplex.Messaging.Protocol (CorrId, RcvPublicDhKey, RcvPublicVerifyKey, RecipientId)
+import Simplex.Messaging.Server (dummyVerifyCmd, verifyCmdSignature)
+import Simplex.Messaging.Server.Expiration
+import Simplex.Messaging.Server.Stats
+import Simplex.Messaging.Transport.HTTP2
+import Simplex.Messaging.Transport.HTTP2.Server
+import Simplex.Messaging.Util
+import System.Exit (exitFailure)
+import System.FilePath ((</>))
+import System.IO (BufferMode (..), hPutStrLn, hSetBuffering)
+import UnliftIO (IOMode (..), withFile)
+import UnliftIO.Concurrent (threadDelay)
+import UnliftIO.Directory (doesFileExist, removeFile, renameFile)
+import UnliftIO.Exception
+import UnliftIO.STM
+
+type M a = ReaderT XFTPEnv IO a
+
+runXFTPServer :: XFTPServerConfig -> IO ()
+runXFTPServer cfg = do
+  started <- newEmptyTMVarIO
+  runXFTPServerBlocking started cfg
+
+runXFTPServerBlocking :: TMVar Bool -> XFTPServerConfig -> IO ()
+runXFTPServerBlocking started cfg = newXFTPServerEnv cfg >>= runReaderT (xftpServer cfg started)
+
+xftpServer :: XFTPServerConfig -> TMVar Bool -> M ()
+xftpServer cfg@XFTPServerConfig {xftpPort, logTLSErrors} started = do
+  restoreServerStats
+  raceAny_ (runServer : expireFilesThread_ cfg <> serverStatsThread_ cfg) `finally` stopServer
+  where
+    runServer :: M ()
+    runServer = do
+      serverParams <- asks tlsServerParams
+      env <- ask
+      liftIO $
+        runHTTP2Server started xftpPort defaultHTTP2BufferSize serverParams logTLSErrors $ \sessionId r sendResponse -> do
+          reqBody <- getHTTP2Body r xftpBlockSize
+          processRequest HTTP2Request {sessionId, request = r, reqBody, sendResponse} `runReaderT` env
+
+    stopServer :: M ()
+    stopServer = do
+      withFileLog closeStoreLog
+      saveServerStats
+
+    expireFilesThread_ :: XFTPServerConfig -> [M ()]
+    expireFilesThread_ XFTPServerConfig {fileExpiration = Just fileExp} = [expireFiles fileExp]
+    expireFilesThread_ _ = []
+
+    expireFiles :: ExpirationConfig -> M ()
+    expireFiles expCfg = do
+      st <- asks store
+      let interval = checkInterval expCfg * 1000000
+      forever $ do
+        liftIO $ threadDelay' interval
+        old <- liftIO $ expireBeforeEpoch expCfg
+        sIds <- M.keysSet <$> readTVarIO (files st)
+        forM_ sIds $ \sId -> do
+          threadDelay 100000
+          atomically (expiredFilePath st sId old)
+            >>= mapM_ (remove $ delete st sId)
+      where
+        remove del filePath =
+          ifM
+            (doesFileExist filePath)
+            (removeFile filePath >> del `catch` \(e :: SomeException) -> logError $ "failed to remove expired file " <> tshow filePath <> ": " <> tshow e)
+            del
+        delete st sId = do
+          withFileLog (`logDeleteFile` sId)
+          void $ atomically $ deleteFile st sId
+
+    serverStatsThread_ :: XFTPServerConfig -> [M ()]
+    serverStatsThread_ XFTPServerConfig {logStatsInterval = Just interval, logStatsStartTime, serverStatsLogFile} =
+      [logServerStats logStatsStartTime interval serverStatsLogFile]
+    serverStatsThread_ _ = []
+
+    logServerStats :: Int64 -> Int64 -> FilePath -> M ()
+    logServerStats startAt logInterval statsFilePath = do
+      initialDelay <- (startAt -) . fromIntegral . (`div` 1000000_000000) . diffTimeToPicoseconds . utctDayTime <$> liftIO getCurrentTime
+      liftIO $ putStrLn $ "server stats log enabled: " <> statsFilePath
+      liftIO $ threadDelay' $ 1_000_000 * (initialDelay + if initialDelay < 0 then 86_400 else 0)
+      FileServerStats {fromTime, filesCreated, fileRecipients, filesUploaded, filesDeleted, filesDownloaded, fileDownloads, fileDownloadAcks, filesCount, filesSize} <- asks serverStats
+      let interval = 1_000_000 * logInterval
+      forever $ do
+        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
+          filesDeleted' <- atomically $ swapTVar filesDeleted 0
+          files <- atomically $ periodStatCounts filesDownloaded ts
+          fileDownloads' <- atomically $ swapTVar fileDownloads 0
+          fileDownloadAcks' <- atomically $ swapTVar fileDownloadAcks 0
+          filesCount' <- atomically $ swapTVar filesCount 0
+          filesSize' <- atomically $ swapTVar filesSize 0
+          hPutStrLn h $
+            intercalate
+              ","
+              [ iso8601Show $ utctDay fromTime',
+                show filesCreated',
+                show fileRecipients',
+                show filesUploaded',
+                show filesDeleted',
+                dayCount files,
+                weekCount files,
+                monthCount files,
+                show fileDownloads',
+                show fileDownloadAcks',
+                show filesCount',
+                show filesSize'
+              ]
+        liftIO $ threadDelay' interval
+
+data ServerFile = ServerFile
+  { filePath :: FilePath,
+    fileSize :: Word32,
+    sbState :: LC.SbState
+  }
+
+processRequest :: HTTP2Request -> M ()
+processRequest HTTP2Request {sessionId, reqBody = body@HTTP2Body {bodyHead}, sendResponse}
+  | B.length bodyHead /= xftpBlockSize = sendXFTPResponse ("", "", FRErr BLOCK) Nothing
+  | otherwise = do
+    case xftpDecodeTransmission sessionId bodyHead of
+      Right (sig_, signed, (corrId, fId, cmdOrErr)) -> do
+        case cmdOrErr of
+          Right cmd -> do
+            verifyXFTPTransmission sig_ signed fId cmd >>= \case
+              VRVerified req -> uncurry send =<< processXFTPRequest body req
+              VRFailed -> send (FRErr AUTH) Nothing
+          Left e -> send (FRErr e) Nothing
+        where
+          send resp = sendXFTPResponse (corrId, fId, resp)
+      Left e -> sendXFTPResponse ("", "", FRErr e) Nothing
+  where
+    sendXFTPResponse :: (CorrId, XFTPFileId, FileResponse) -> Maybe ServerFile -> M ()
+    sendXFTPResponse (corrId, fId, resp) serverFile_ = do
+      let t_ = xftpEncodeTransmission sessionId Nothing (corrId, fId, resp)
+      liftIO $ sendResponse $ H.responseStreaming N.ok200 [] $ streamBody t_
+      where
+        streamBody t_ send done = do
+          case t_ of
+            Left _ -> do
+              send "padding error" -- TODO respond with BLOCK error?
+              done
+            Right t -> do
+              send $ byteString t
+              -- timeout sending file in the same way as receiving
+              forM_ serverFile_ $ \ServerFile {filePath, fileSize, sbState} -> do
+                withFile filePath ReadMode $ \h -> sendEncFile h send sbState (fromIntegral fileSize)
+          done
+
+data VerificationResult = VRVerified XFTPRequest | VRFailed
+
+verifyXFTPTransmission :: Maybe C.ASignature -> ByteString -> XFTPFileId -> FileCmd -> M VerificationResult
+verifyXFTPTransmission sig_ signed fId cmd =
+  case cmd of
+    FileCmd SFSender (FNEW file rcps auth) -> pure $ XFTPReqNew file rcps auth `verifyWith` sndKey file
+    FileCmd SFRecipient PING -> pure $ VRVerified XFTPReqPing
+    FileCmd party _ -> verifyCmd party
+  where
+    verifyCmd :: SFileParty p -> M VerificationResult
+    verifyCmd party = do
+      st <- asks store
+      atomically $ verify <$> getFile st party fId
+      where
+        verify = \case
+          Right (fr, k) -> XFTPReqCmd fId fr cmd `verifyWith` k
+          _ -> maybe False (dummyVerifyCmd signed) sig_ `seq` VRFailed
+    req `verifyWith` k = if verifyCmdSignature sig_ signed k then VRVerified req else VRFailed
+
+processXFTPRequest :: HTTP2Body -> XFTPRequest -> M (FileResponse, Maybe ServerFile)
+processXFTPRequest HTTP2Body {bodyPart} = \case
+  XFTPReqNew file rks auth -> noFile =<< ifM allowNew (createFile file rks) (pure $ FRErr AUTH)
+    where
+      allowNew = do
+        XFTPServerConfig {allowNewFiles, newFileBasicAuth} <- asks config
+        pure $ allowNewFiles && maybe True ((== auth) . Just) newFileBasicAuth
+  XFTPReqCmd fId fr (FileCmd _ cmd) -> case cmd of
+    FADD rks -> noFile =<< addRecipients fId rks
+    FPUT -> noFile =<< receiveServerFile fr
+    FDEL -> noFile =<< deleteServerFile fr
+    FGET rDhKey -> sendServerFile fr rDhKey
+    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
+  XFTPReqPing -> noFile FRPong
+  where
+    noFile resp = pure (resp, Nothing)
+    createFile :: FileInfo -> NonEmpty RcvPublicVerifyKey -> M FileResponse
+    createFile file rks = do
+      st <- asks store
+      r <- runExceptT $ do
+        sizes <- asks $ allowedChunkSizes . config
+        unless (size file `elem` sizes) $ throwError SIZE
+        ts <- liftIO getSystemTime
+        -- TODO validate body empty
+        sId <- ExceptT $ addFileRetry st file 3 ts
+        rcps <- mapM (ExceptT . addRecipientRetry st 3 sId) rks
+        withFileLog $ \sl -> do
+          logAddFile sl sId file ts
+          logAddRecipients sl sId rcps
+        stats <- asks serverStats
+        atomically $ modifyTVar' (filesCreated stats) (+ 1)
+        atomically $ modifyTVar' (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 st file n ts =
+      retryAdd n $ \sId -> runExceptT $ do
+        ExceptT $ addFile st sId file ts
+        pure sId
+    addRecipientRetry :: FileStore -> Int -> XFTPFileId -> RcvPublicVerifyKey -> M (Either XFTPErrorType FileRecipient)
+    addRecipientRetry st n sId rpk =
+      retryAdd n $ \rId -> runExceptT $ do
+        let rcp = FileRecipient rId rpk
+        ExceptT $ addRecipient st sId rcp
+        pure rcp
+    retryAdd :: Int -> (XFTPFileId -> STM (Either XFTPErrorType a)) -> M (Either XFTPErrorType a)
+    retryAdd 0 _ = pure $ Left INTERNAL
+    retryAdd n add = do
+      fId <- getFileId
+      atomically (add fId) >>= \case
+        Left DUPLICATE_ -> retryAdd (n - 1) add
+        r -> pure r
+    addRecipients :: XFTPFileId -> NonEmpty RcvPublicVerifyKey -> M FileResponse
+    addRecipients sId rks = do
+      st <- asks store
+      r <- runExceptT $ do
+        rcps <- mapM (ExceptT . addRecipientRetry st 3 sId) rks
+        withFileLog $ \sl -> logAddRecipients sl sId rcps
+        stats <- asks serverStats
+        atomically $ modifyTVar' (fileRecipients stats) (+ length rks)
+        let rIds = L.map (\(FileRecipient rId _) -> rId) rcps
+        pure $ FRRcvIds rIds
+      pure $ either FRErr id r
+    receiveServerFile :: FileRec -> M FileResponse
+    receiveServerFile fr@FileRec {senderId, fileInfo} = case bodyPart of
+      -- TODO do not allow repeated file upload
+      Nothing -> pure $ FRErr SIZE
+      Just getBody -> do
+        -- TODO validate body size before downloading, once it's populated
+        path <- asks $ filesPath . config
+        let fPath = path </> B.unpack (B64.encode senderId)
+            FileInfo {size, digest} = fileInfo
+        withFileLog $ \sl -> logPutFile sl senderId fPath
+        st <- asks store
+        quota_ <- asks $ fileSizeQuota . config
+        -- TODO timeout file upload, remove partially uploaded files
+        stats <- asks serverStats
+        liftIO $
+          runExceptT (receiveFile getBody (XFTPRcvChunkSpec fPath size digest)) >>= \case
+            Right () -> do
+              used <- readTVarIO $ usedStorage st
+              if maybe False (used + fromIntegral size >) quota_
+                then remove fPath $> FRErr QUOTA
+                else do
+                  atomically (setFilePath' st fr fPath)
+                  atomically $ modifyTVar' (filesUploaded stats) (+ 1)
+                  atomically $ modifyTVar' (filesCount stats) (+ 1)
+                  atomically $ modifyTVar' (filesSize stats) (+ fromIntegral size)
+                  pure FROk
+            Left e -> remove fPath $> FRErr e
+        where
+          remove fPath = whenM (doesFileExist fPath) (removeFile fPath) `catch` logFileError
+
+    sendServerFile :: FileRec -> RcvPublicDhKey -> M (FileResponse, Maybe ServerFile)
+    sendServerFile FileRec {senderId, filePath, fileInfo = FileInfo {size}} rDhKey = do
+      readTVarIO filePath >>= \case
+        Just path -> do
+          (sDhKey, spDhKey) <- liftIO C.generateKeyPair'
+          let dhSecret = C.dh' rDhKey spDhKey
+          cbNonce <- liftIO C.randomCbNonce
+          case LC.cbInit dhSecret cbNonce of
+            Right sbState -> do
+              stats <- asks serverStats
+              atomically $ modifyTVar' (fileDownloads stats) (+ 1)
+              atomically $ updatePeriodStats (filesDownloaded stats) senderId
+              pure (FRFile sDhKey cbNonce, Just ServerFile {filePath = path, fileSize = size, sbState})
+            _ -> pure (FRErr INTERNAL, Nothing)
+        _ -> pure (FRErr NO_FILE, Nothing)
+
+    deleteServerFile :: FileRec -> M FileResponse
+    deleteServerFile FileRec {senderId, fileInfo, filePath} = do
+      withFileLog (`logDeleteFile` senderId)
+      r <- 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)
+        pure FROk
+      either (pure . FRErr) pure r
+      where
+        deletedStats stats = do
+          atomically $ modifyTVar' (filesCount stats) (subtract 1)
+          atomically $ modifyTVar' (filesSize stats) (subtract $ fromIntegral $ size fileInfo)
+
+    logFileError :: SomeException -> IO ()
+    logFileError e = logError $ "Error deleting file: " <> tshow e
+
+    ackFileReception :: RecipientId -> FileRec -> M FileResponse
+    ackFileReception rId fr = do
+      withFileLog (`logAckFile` rId)
+      st <- asks store
+      atomically $ deleteRecipient st rId fr
+      stats <- asks serverStats
+      atomically $ modifyTVar' (fileDownloadAcks stats) (+ 1)
+      pure FROk
+
+randomId :: (MonadUnliftIO m, MonadReader XFTPEnv m) => Int -> m ByteString
+randomId n = do
+  gVar <- asks idsDrg
+  atomically (C.pseudoRandomBytes n gVar)
+
+getFileId :: M XFTPFileId
+getFileId = liftIO . getRandomBytes =<< asks (fileIdSize . config)
+
+withFileLog :: (MonadIO m, MonadReader XFTPEnv m) => (StoreLog 'WriteMode -> IO a) -> m ()
+withFileLog action = liftIO . mapM_ action =<< asks storeLog
+
+incFileStat :: (FileServerStats -> TVar Int) -> M ()
+incFileStat statSel = do
+  stats <- asks serverStats
+  atomically $ modifyTVar (statSel stats) (+ 1)
+
+saveServerStats :: M ()
+saveServerStats =
+  asks (serverStatsBackupFile . config)
+    >>= mapM_ (\f -> asks serverStats >>= atomically . getFileServerStatsData >>= liftIO . saveStats f)
+  where
+    saveStats f stats = do
+      logInfo $ "saving server stats to file " <> T.pack f
+      B.writeFile f $ strEncode stats
+      logInfo "server stats saved"
+
+restoreServerStats :: M ()
+restoreServerStats = asks (serverStatsBackupFile . config) >>= mapM_ restoreStats
+  where
+    restoreStats f = whenM (doesFileExist f) $ do
+      logInfo $ "restoring server stats from file " <> T.pack f
+      liftIO (strDecode <$> B.readFile f) >>= \case
+        Right d -> do
+          s <- asks serverStats
+          fs <- readTVarIO . files =<< asks store
+          let _filesCount = length $ M.keys fs
+              _filesSize = M.foldl' (\n -> (n +) . fromIntegral . size . fileInfo) 0 fs
+          atomically $ setFileServerStats s d {_filesCount, _filesSize}
+          renameFile f $ f <> ".bak"
+          logInfo "server stats restored"
+        Left e -> do
+          logInfo $ "error restoring server stats: " <> T.pack e
+          liftIO exitFailure

src/Simplex/FileTransfer/Server/Env.hs

@@ -0,0 +1,98 @@
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE GADTs #-}
+{-# LANGUAGE KindSignatures #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE StrictData #-}
+
+module Simplex.FileTransfer.Server.Env where
+
+import Control.Logger.Simple (logInfo)
+import Control.Monad
+import Control.Monad.IO.Unlift
+import Crypto.Random
+import Data.Int (Int64)
+import Data.List.NonEmpty (NonEmpty)
+import Data.Time.Clock (getCurrentTime)
+import Data.Word (Word32)
+import Data.X509.Validation (Fingerprint (..))
+import Network.Socket
+import qualified Network.TLS as T
+import Simplex.FileTransfer.Protocol (FileCmd, FileInfo, XFTPFileId)
+import Simplex.FileTransfer.Server.Stats
+import Simplex.FileTransfer.Server.Store
+import Simplex.FileTransfer.Server.StoreLog
+import qualified Simplex.Messaging.Crypto as C
+import Simplex.Messaging.Protocol (BasicAuth, RcvPublicVerifyKey)
+import Simplex.Messaging.Server.Expiration
+import Simplex.Messaging.Transport.Server (loadFingerprint, loadTLSServerParams)
+import Simplex.Messaging.Util (tshow)
+import System.IO (IOMode (..))
+import UnliftIO.STM
+
+data XFTPServerConfig = XFTPServerConfig
+  { xftpPort :: ServiceName,
+    fileIdSize :: Int,
+    storeLogFile :: Maybe FilePath,
+    filesPath :: FilePath,
+    -- | server storage quota
+    fileSizeQuota :: Maybe Int64,
+    -- | allowed file chunk sizes
+    allowedChunkSizes :: [Word32],
+    -- | set to False to prohibit creating new files
+    allowNewFiles :: Bool,
+    -- | simple password that the clients need to pass in handshake to be able to create new files
+    newFileBasicAuth :: Maybe BasicAuth,
+    -- | time after which the files can be removed and check interval, seconds
+    fileExpiration :: Maybe ExpirationConfig,
+    -- CA certificate private key is not needed for initialization
+    caCertificateFile :: FilePath,
+    privateKeyFile :: FilePath,
+    certificateFile :: FilePath,
+    -- stats config - see SMP server config
+    logStatsInterval :: Maybe Int64,
+    logStatsStartTime :: Int64,
+    serverStatsLogFile :: FilePath,
+    serverStatsBackupFile :: Maybe FilePath,
+    logTLSErrors :: Bool
+  }
+
+data XFTPEnv = XFTPEnv
+  { config :: XFTPServerConfig,
+    store :: FileStore,
+    storeLog :: Maybe (StoreLog 'WriteMode),
+    idsDrg :: TVar ChaChaDRG,
+    serverIdentity :: C.KeyHash,
+    tlsServerParams :: T.ServerParams,
+    serverStats :: FileServerStats
+  }
+
+defFileExpirationHours :: Int64
+defFileExpirationHours = 48
+
+defaultFileExpiration :: ExpirationConfig
+defaultFileExpiration =
+  ExpirationConfig
+    { ttl = defFileExpirationHours * 3600, -- seconds
+      checkInterval = 2 * 3600 -- seconds, 2 hours
+    }
+
+newXFTPServerEnv :: (MonadUnliftIO m, MonadRandom m) => XFTPServerConfig -> m XFTPEnv
+newXFTPServerEnv config@XFTPServerConfig {storeLogFile, fileSizeQuota, caCertificateFile, certificateFile, privateKeyFile} = do
+  idsDrg <- drgNew >>= newTVarIO
+  store <- atomically newFileStore
+  storeLog <- liftIO $ mapM (`readWriteFileStore` store) storeLogFile
+  used <- readTVarIO (usedStorage store)
+  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 <- liftIO $ loadTLSServerParams caCertificateFile certificateFile privateKeyFile
+  Fingerprint fp <- liftIO $ loadFingerprint caCertificateFile
+  serverStats <- atomically . newFileServerStats =<< liftIO getCurrentTime
+  pure XFTPEnv {config, store, storeLog, idsDrg, tlsServerParams, serverIdentity = C.KeyHash fp, serverStats}
+
+data XFTPRequest
+  = XFTPReqNew FileInfo (NonEmpty RcvPublicVerifyKey) (Maybe BasicAuth)
+  | XFTPReqCmd XFTPFileId FileRec FileCmd
+  | XFTPReqPing

src/Simplex/FileTransfer/Server/Main.hs

@@ -0,0 +1,223 @@
+{-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedLists #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE PatternSynonyms #-}
+
+module Simplex.FileTransfer.Server.Main where
+
+import qualified Data.ByteString.Char8 as B
+import Data.Either (fromRight)
+import Data.Functor (($>))
+import Data.Ini (lookupValue, readIniFile)
+import Data.Int (Int64)
+import Data.Maybe (fromMaybe)
+import qualified Data.Text as T
+import Network.Socket (HostName)
+import Options.Applicative
+import Simplex.FileTransfer.Description (FileSize (..), kb, mb)
+import Simplex.FileTransfer.Server (runXFTPServer)
+import Simplex.FileTransfer.Server.Env (XFTPServerConfig (..), defaultFileExpiration, defFileExpirationHours)
+import qualified Simplex.Messaging.Crypto as C
+import Simplex.Messaging.Encoding.String
+import Simplex.Messaging.Protocol (ProtoServerWithAuth (..), pattern XFTPServer)
+import Simplex.Messaging.Server.CLI
+import Simplex.Messaging.Server.Expiration
+import Simplex.Messaging.Transport.Client (TransportHost (..))
+import System.Directory (createDirectoryIfMissing, doesFileExist)
+import System.FilePath (combine)
+import System.IO (BufferMode (..), hSetBuffering, stderr, stdout)
+import Text.Read (readMaybe)
+
+xftpServerVersion :: String
+xftpServerVersion = "1.0.0"
+
+xftpServerCLI :: FilePath -> FilePath -> IO ()
+xftpServerCLI cfgPath logPath = do
+  getCliCommand' (cliCommandP cfgPath logPath iniFile) serverVersion >>= \case
+    Init opts ->
+      doesFileExist iniFile >>= \case
+        True -> exitError $ "Error: server is already initialized (" <> iniFile <> " exists).\nRun `" <> executableName <> " start`."
+        _ -> initializeServer opts
+    Start ->
+      doesFileExist iniFile >>= \case
+        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!"
+      deleteDirIfExists cfgPath
+      deleteDirIfExists logPath
+      putStrLn "Deleted configuration and log files"
+  where
+    iniFile = combine cfgPath "file-server.ini"
+    serverVersion = "SimpleX XFTP server v" <> xftpServerVersion
+    defaultServerPort = "443"
+    executableName = "file-server"
+    storeLogFilePath = combine logPath "file-server-store.log"
+    initializeServer InitOptions {enableStoreLog, signAlgorithm, ip, fqdn, filesPath, fileSizeQuota} = do
+      clearDirIfExists cfgPath
+      clearDirIfExists logPath
+      createDirectoryIfMissing True cfgPath
+      createDirectoryIfMissing True logPath
+      let x509cfg = defaultX509Config {commonName = fromMaybe ip fqdn, signAlgorithm}
+      fp <- createServerX509 cfgPath x509cfg
+      let host = fromMaybe (if ip == "127.0.0.1" then "<hostnames>" else ip) fqdn
+          srv = ProtoServerWithAuth (XFTPServer [THDomainName host] "" (C.KeyHash fp)) Nothing
+      writeFile iniFile $ iniFileContent host
+      putStrLn $ "Server initialized, you can modify configuration in " <> iniFile <> ".\nRun `" <> executableName <> " start` to start server."
+      warnCAPrivateKeyFile cfgPath x509cfg
+      printServiceInfo serverVersion srv
+      where
+        iniFileContent host =
+          "[STORE_LOG]\n\
+          \# The server uses STM memory for persistence,\n\
+          \# that will be lost on restart (e.g., as with redis).\n\
+          \# This option enables saving memory to append only log,\n\
+          \# and restoring it when the server is started.\n\
+          \# Log is compacted on start (deleted objects are removed).\n"
+            <> ("enable: " <> onOff enableStoreLog <> "\n\n")
+            <> "# Expire files after the specified number of hours.\n"
+            <> ("expire_files_hours: " <> show defFileExpirationHours <> "\n\n")
+            <> "log_stats: off\n\
+               \\n\
+               \[AUTH]\n\
+               \# Set new_files option to off to completely prohibit uploading new files.\n\
+               \# This can be useful when you want to decommission the server, but still allow downloading the existing files.\n\
+               \new_files: on\n\
+               \\n\
+               \# Use create_password option to enable basic auth to upload new files.\n\
+               \# The password should be used as part of server address in client configuration:\n\
+               \# xftp://fingerprint:password@host1,host2\n\
+               \# The password will not be shared with file recipients, you must share it only\n\
+               \# with the users who you want to allow uploading files to your server.\n\
+               \# create_password: password to upload files (any printable ASCII characters without whitespace, '@', ':' and '/')\n\
+               \\n\
+               \[TRANSPORT]\n\
+               \# host is only used to print server address on start\n"
+            <> ("host: " <> host <> "\n")
+            <> ("port: " <> defaultServerPort <> "\n")
+            <> "log_tls_errors: off\n\
+               \\n\
+               \[FILES]\n"
+            <> ("path: " <> filesPath <> "\n")
+            <> ("storage_quota: " <> B.unpack (strEncode fileSizeQuota) <> "\n")
+    runServer ini = do
+      hSetBuffering stdout LineBuffering
+      hSetBuffering stderr LineBuffering
+      fp <- checkSavedFingerprint cfgPath defaultX509Config
+      let host = fromRight "<hostnames>" $ T.unpack <$> lookupValue "TRANSPORT" "host" ini
+          port = T.unpack $ strictIni "TRANSPORT" "port" ini
+          srv = ProtoServerWithAuth (XFTPServer [THDomainName host] (if port == "443" then "" else port) (C.KeyHash fp)) Nothing
+      printServiceInfo serverVersion srv
+      printXFTPConfig serverConfig
+      runXFTPServer serverConfig
+      where
+        enableStoreLog = settingIsOn "STORE_LOG" "enable" ini
+        logStats = settingIsOn "STORE_LOG" "log_stats" ini
+        c = combine cfgPath . ($ defaultX509Config)
+        printXFTPConfig XFTPServerConfig {allowNewFiles, newFileBasicAuth, xftpPort, storeLogFile, fileExpiration} = do
+          putStrLn $ case storeLogFile of
+            Just f -> "Store log: " <> f
+            _ -> "Store log disabled."
+          putStrLn $ case fileExpiration of
+            Just ExpirationConfig {ttl} -> "expiring files after " <> showTTL ttl
+            _ -> "not expiring files"
+          putStrLn $
+            "Uploading new files "
+              <> if allowNewFiles
+                then maybe "allowed." (const "requires password.") newFileBasicAuth
+                else "NOT allowed."
+          putStrLn $ "Listening on port " <> xftpPort <> "..."
+
+        serverConfig =
+          XFTPServerConfig
+            { xftpPort = T.unpack $ strictIni "TRANSPORT" "port" ini,
+              fileIdSize = 16,
+              storeLogFile = enableStoreLog $> storeLogFilePath,
+              filesPath = T.unpack $ strictIni "FILES" "path" ini,
+              fileSizeQuota = either error unFileSize <$> strDecodeIni "FILES" "storage_quota" ini,
+              allowedChunkSizes = [kb 256, mb 1, mb 4],
+              allowNewFiles = fromMaybe True $ iniOnOff "AUTH" "new_files" ini,
+              newFileBasicAuth = either error id <$> strDecodeIni "AUTH" "create_password" ini,
+              fileExpiration =
+                Just defaultFileExpiration
+                  { ttl = 3600 * readIniDefault defFileExpirationHours "STORE_LOG" "expire_files_hours" ini
+                  },
+              caCertificateFile = c caCrtFile,
+              privateKeyFile = c serverKeyFile,
+              certificateFile = c serverCrtFile,
+              logStatsInterval = logStats $> 86400, -- seconds
+              logStatsStartTime = 0, -- seconds from 00:00 UTC
+              serverStatsLogFile = combine logPath "file-server-stats.daily.log",
+              serverStatsBackupFile = logStats $> combine logPath "file-server-stats.log",
+              logTLSErrors = fromMaybe False $ iniOnOff "TRANSPORT" "log_tls_errors" ini
+            }
+
+data CliCommand
+  = Init InitOptions
+  | Start
+  | Delete
+
+data InitOptions = InitOptions
+  { enableStoreLog :: Bool,
+    signAlgorithm :: SignAlgorithm,
+    ip :: HostName,
+    fqdn :: Maybe HostName,
+    filesPath :: FilePath,
+    fileSizeQuota :: FileSize Int64
+  }
+  deriving (Show)
+
+cliCommandP :: FilePath -> FilePath -> FilePath -> Parser CliCommand
+cliCommandP cfgPath logPath iniFile =
+  hsubparser
+    ( command "init" (info (Init <$> initP) (progDesc $ "Initialize server - creates " <> cfgPath <> " and " <> logPath <> " directories and configuration files"))
+        <> command "start" (info (pure Start) (progDesc $ "Start server (configuration: " <> iniFile <> ")"))
+        <> command "delete" (info (pure Delete) (progDesc "Delete configuration and log files"))
+    )
+  where
+    initP :: Parser InitOptions
+    initP =
+      InitOptions
+        <$> switch
+          ( long "store-log"
+              <> short 'l'
+              <> help "Enable store log for persistence"
+          )
+        <*> option
+          (maybeReader readMaybe)
+          ( long "sign-algorithm"
+              <> short 'a'
+              <> help "Signature algorithm used for TLS certificates: ED25519, ED448"
+              <> value ED448
+              <> showDefault
+              <> metavar "ALG"
+          )
+        <*> strOption
+          ( long "ip"
+              <> help
+                "Server IP address, used as Common Name for TLS online certificate if FQDN is not supplied"
+              <> value "127.0.0.1"
+              <> showDefault
+              <> metavar "IP"
+          )
+        <*> (optional . strOption)
+          ( long "fqdn"
+              <> short 'n'
+              <> help "Server FQDN used as Common Name for TLS online certificate"
+              <> showDefault
+              <> metavar "FQDN"
+          )
+        <*> strOption
+          ( long "path"
+              <> short 'p'
+              <> help "Path to the directory to store files"
+              <> metavar "PATH"
+          )
+        <*> strOption
+          ( long "quota"
+              <> short 'q'
+              <> help "File storage quota (e.g. 100gb)"
+              <> metavar "QUOTA"
+          )

src/Simplex/FileTransfer/Server/Stats.hs

@@ -0,0 +1,106 @@
+{-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+module Simplex.FileTransfer.Server.Stats where
+
+import qualified Data.Attoparsec.ByteString.Char8 as A
+import qualified Data.ByteString.Char8 as B
+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,
+    filesDeleted :: TVar Int,
+    filesDownloaded :: PeriodStats SenderId,
+    fileDownloads :: TVar Int,
+    fileDownloadAcks :: TVar Int,
+    filesCount :: TVar Int,
+    filesSize :: TVar Int64
+  }
+
+data FileServerStatsData = FileServerStatsData
+  { _fromTime :: UTCTime,
+    _filesCreated :: Int,
+    _fileRecipients :: Int,
+    _filesUploaded :: Int,
+    _filesDeleted :: Int,
+    _filesDownloaded :: PeriodStatsData SenderId,
+    _fileDownloads :: Int,
+    _fileDownloadAcks :: Int,
+    _filesCount :: Int,
+    _filesSize :: Int64
+  }
+  deriving (Show)
+
+newFileServerStats :: UTCTime -> STM FileServerStats
+newFileServerStats ts = do
+  fromTime <- newTVar ts
+  filesCreated <- newTVar 0
+  fileRecipients <- newTVar 0
+  filesUploaded <- newTVar 0
+  filesDeleted <- newTVar 0
+  filesDownloaded <- newPeriodStats
+  fileDownloads <- newTVar 0
+  fileDownloadAcks <- newTVar 0
+  filesCount <- newTVar 0
+  filesSize <- newTVar 0
+  pure FileServerStats {fromTime, filesCreated, fileRecipients, filesUploaded, filesDeleted, filesDownloaded, fileDownloads, fileDownloadAcks, filesCount, filesSize}
+
+getFileServerStatsData :: FileServerStats -> STM FileServerStatsData
+getFileServerStatsData s = do
+  _fromTime <- readTVar $ fromTime (s :: FileServerStats)
+  _filesCreated <- readTVar $ filesCreated s
+  _fileRecipients <- readTVar $ fileRecipients s
+  _filesUploaded <- readTVar $ filesUploaded s
+  _filesDeleted <- readTVar $ filesDeleted s
+  _filesDownloaded <- getPeriodStatsData $ filesDownloaded s
+  _fileDownloads <- readTVar $ fileDownloads s
+  _fileDownloadAcks <- readTVar $ fileDownloadAcks s
+  _filesCount <- readTVar $ filesCount s
+  _filesSize <- readTVar $ filesSize s
+  pure FileServerStatsData {_fromTime, _filesCreated, _fileRecipients, _filesUploaded, _filesDeleted, _filesDownloaded, _fileDownloads, _fileDownloadAcks, _filesCount, _filesSize}
+
+setFileServerStats :: FileServerStats -> FileServerStatsData -> STM ()
+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 (filesDeleted s) $! _filesDeleted 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
+
+instance StrEncoding FileServerStatsData where
+  strEncode FileServerStatsData {_fromTime, _filesCreated, _fileRecipients, _filesUploaded, _filesDeleted, _filesDownloaded, _fileDownloads, _fileDownloadAcks} =
+    B.unlines
+      [ "fromTime=" <> strEncode _fromTime,
+        "filesCreated=" <> strEncode _filesCreated,
+        "fileRecipients=" <> strEncode _fileRecipients,
+        "filesUploaded=" <> strEncode _filesUploaded,
+        "filesDeleted=" <> strEncode _filesDeleted,
+        "filesDownloaded:",
+        strEncode _filesDownloaded,
+        "fileDownloads=" <> strEncode _fileDownloads,
+        "fileDownloadAcks=" <> strEncode _fileDownloadAcks
+      ]
+  strP = do
+    _fromTime <- "fromTime=" *> strP <* A.endOfLine
+    _filesCreated <- "filesCreated=" *> strP <* A.endOfLine
+    _fileRecipients <- "fileRecipients=" *> strP <* A.endOfLine
+    _filesUploaded <- "filesUploaded=" *> strP <* A.endOfLine
+    _filesDeleted <- "filesDeleted=" *> strP <* A.endOfLine
+    _filesDownloaded <- "filesDownloaded:" *> A.endOfLine *> strP <* A.endOfLine
+    _fileDownloads <- "fileDownloads=" *> strP <* A.endOfLine
+    _fileDownloadAcks <- "fileDownloadAcks=" *> strP <* A.endOfLine
+    pure FileServerStatsData {_fromTime, _filesCreated, _fileRecipients, _filesUploaded, _filesDeleted, _filesDownloaded, _fileDownloads, _fileDownloadAcks, _filesCount = 0, _filesSize = 0}

src/Simplex/FileTransfer/Server/Store.hs

@@ -0,0 +1,145 @@
+{-# LANGUAGE GADTs #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE TupleSections #-}
+
+module Simplex.FileTransfer.Server.Store
+  ( FileStore (..),
+    FileRec (..),
+    FileRecipient (..),
+    newFileStore,
+    addFile,
+    setFilePath,
+    setFilePath',
+    addRecipient,
+    deleteFile,
+    deleteRecipient,
+    expiredFilePath,
+    getFile,
+    ackFile,
+  )
+where
+
+import Control.Concurrent.STM
+import qualified Data.Attoparsec.ByteString.Char8 as A
+import Data.Functor (($>))
+import Data.Int (Int64)
+import Data.Set (Set)
+import qualified Data.Set as S
+import Data.Time.Clock.System (SystemTime (..))
+import Simplex.FileTransfer.Protocol (FileInfo (..), SFileParty (..), XFTPErrorType (..), XFTPFileId)
+import qualified Simplex.Messaging.Crypto as C
+import Simplex.Messaging.Encoding.String
+import Simplex.Messaging.Protocol (RcvPublicVerifyKey, RecipientId, SenderId)
+import Simplex.Messaging.TMap (TMap)
+import qualified Simplex.Messaging.TMap as TM
+import Simplex.Messaging.Util (ifM, ($>>=))
+
+data FileStore = FileStore
+  { files :: TMap SenderId FileRec,
+    recipients :: TMap RecipientId (SenderId, RcvPublicVerifyKey),
+    usedStorage :: TVar Int64
+  }
+
+data FileRec = FileRec
+  { senderId :: SenderId,
+    fileInfo :: FileInfo,
+    filePath :: TVar (Maybe FilePath),
+    recipientIds :: TVar (Set RecipientId),
+    createdAt :: SystemTime
+  }
+  deriving (Eq)
+
+data FileRecipient = FileRecipient RecipientId RcvPublicVerifyKey
+
+instance StrEncoding FileRecipient where
+  strEncode (FileRecipient rId rKey) = strEncode rId <> ":" <> strEncode rKey
+  strP = FileRecipient <$> strP <* A.char ':' <*> strP
+
+newFileStore :: STM FileStore
+newFileStore = do
+  files <- TM.empty
+  recipients <- TM.empty
+  usedStorage <- newTVar 0
+  pure FileStore {files, recipients, usedStorage}
+
+addFile :: FileStore -> SenderId -> FileInfo -> SystemTime -> 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 createdAt = do
+  recipientIds <- newTVar S.empty
+  filePath <- newTVar Nothing
+  pure FileRec {senderId, fileInfo, filePath, recipientIds, createdAt}
+
+setFilePath :: FileStore -> SenderId -> FilePath -> STM (Either XFTPErrorType ())
+setFilePath st sId fPath =
+  withFile st sId $ \fr -> setFilePath' st fr fPath $> Right ()
+
+setFilePath' :: FileStore -> FileRec -> FilePath -> STM ()
+setFilePath' st FileRec {fileInfo, filePath} fPath = do
+  writeTVar filePath (Just fPath)
+  modifyTVar' (usedStorage st) (+ fromIntegral (size fileInfo))
+
+addRecipient :: FileStore -> SenderId -> FileRecipient -> STM (Either XFTPErrorType ())
+addRecipient st@FileStore {recipients} senderId (FileRecipient rId rKey) =
+  withFile st senderId $ \FileRec {recipientIds} -> do
+    rIds <- readTVar recipientIds
+    mem <- TM.member rId recipients
+    if rId `S.member` rIds || mem
+      then pure $ Left DUPLICATE_
+      else do
+        writeTVar recipientIds $! S.insert rId rIds
+        TM.insert rId (senderId, rKey) recipients
+        pure $ Right ()
+
+-- this function must be called after the file is deleted from the file system
+deleteFile :: FileStore -> SenderId -> STM (Either XFTPErrorType ())
+deleteFile FileStore {files, recipients, usedStorage} senderId = do
+  TM.lookupDelete senderId files >>= \case
+    Just FileRec {fileInfo, recipientIds} -> do
+      readTVar recipientIds >>= mapM_ (`TM.delete` recipients)
+      modifyTVar' usedStorage $ subtract (fromIntegral $ size fileInfo)
+      pure $ Right ()
+    _ -> pure $ Left AUTH
+
+deleteRecipient :: FileStore -> RecipientId -> FileRec -> STM ()
+deleteRecipient FileStore {recipients} rId FileRec {recipientIds} = do
+  TM.delete rId recipients
+  modifyTVar' recipientIds $ S.delete rId
+
+getFile :: FileStore -> SFileParty p -> XFTPFileId -> STM (Either XFTPErrorType (FileRec, C.APublicVerifyKey))
+getFile st party fId = case party of
+  SFSender -> withFile st fId $ pure . Right . (\f -> (f, sndKey $ fileInfo f))
+  SFRecipient ->
+    TM.lookup fId (recipients st) >>= \case
+      Just (sId, rKey) -> withFile st sId $ pure . Right . (,rKey)
+      _ -> pure $ Left AUTH
+
+expiredFilePath :: FileStore -> XFTPFileId -> Int64 -> STM (Maybe FilePath)
+expiredFilePath FileStore {files} sId old =
+  TM.lookup sId files
+    $>>= \FileRec {filePath, createdAt} ->
+      if systemSeconds createdAt < old
+        then readTVar filePath
+        else pure Nothing
+
+ackFile :: FileStore -> RecipientId -> STM (Either XFTPErrorType ())
+ackFile st@FileStore {recipients} recipientId = do
+  TM.lookupDelete recipientId recipients >>= \case
+    Just (sId, _) ->
+      withFile st sId $ \FileRec {recipientIds} -> do
+        modifyTVar' recipientIds $ S.delete recipientId
+        pure $ Right ()
+    _ -> pure $ Left AUTH
+
+withFile :: FileStore -> SenderId -> (FileRec -> STM (Either XFTPErrorType a)) -> STM (Either XFTPErrorType a)
+withFile FileStore {files} sId a =
+  TM.lookup sId files >>= \case
+    Just f -> a f
+    _ -> pure $ Left AUTH

src/Simplex/FileTransfer/Server/StoreLog.hs

@@ -0,0 +1,124 @@
+{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE GADTs #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+module Simplex.FileTransfer.Server.StoreLog
+  ( StoreLog,
+    FileStoreLogRecord (..),
+    closeStoreLog,
+    readWriteFileStore,
+    logAddFile,
+    logPutFile,
+    logAddRecipients,
+    logDeleteFile,
+    logAckFile,
+  )
+where
+
+import Control.Concurrent.STM
+import Control.Monad.Except
+import qualified Data.Attoparsec.ByteString.Char8 as A
+import qualified Data.ByteString.Char8 as B
+import Data.Composition ((.:), (.:.))
+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 (RcvPublicVerifyKey, RecipientId, SenderId)
+import Simplex.Messaging.Server.StoreLog
+import Simplex.Messaging.Util (bshow, whenM)
+import System.Directory (doesFileExist, renameFile)
+import System.IO
+
+data FileStoreLogRecord
+  = AddFile SenderId FileInfo SystemTime
+  | PutFile SenderId FilePath
+  | AddRecipients SenderId (NonEmpty FileRecipient)
+  | DeleteFile SenderId
+  | AckFile RecipientId
+
+instance StrEncoding FileStoreLogRecord where
+  strEncode = \case
+    AddFile sId file createdAt -> strEncode (Str "FNEW", sId, file, createdAt)
+    PutFile sId path -> strEncode (Str "FPUT", sId, path)
+    AddRecipients sId rcps -> strEncode (Str "FADD", sId, rcps)
+    DeleteFile sId -> strEncode (Str "FDEL", sId)
+    AckFile rId -> strEncode (Str "FACK", rId)
+  strP =
+    A.choice
+      [ "FNEW " *> (AddFile <$> strP_ <*> strP_ <*> strP),
+        "FPUT " *> (PutFile <$> strP_ <*> strP),
+        "FADD " *> (AddRecipients <$> strP_ <*> strP),
+        "FDEL " *> (DeleteFile <$> strP),
+        "FACK " *> (AckFile <$> strP)
+      ]
+
+logFileStoreRecord :: StoreLog 'WriteMode -> FileStoreLogRecord -> IO ()
+logFileStoreRecord = writeStoreLogRecord
+
+logAddFile :: StoreLog 'WriteMode -> SenderId -> FileInfo -> SystemTime -> IO ()
+logAddFile s = logFileStoreRecord s .:. AddFile
+
+logPutFile :: StoreLog 'WriteMode -> SenderId -> FilePath -> IO ()
+logPutFile s = logFileStoreRecord s .: PutFile
+
+logAddRecipients :: StoreLog 'WriteMode -> SenderId -> NonEmpty FileRecipient -> IO ()
+logAddRecipients s = logFileStoreRecord s .: AddRecipients
+
+logDeleteFile :: StoreLog 'WriteMode -> SenderId -> IO ()
+logDeleteFile s = logFileStoreRecord s . DeleteFile
+
+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
+
+readFileStore :: FilePath -> FileStore -> IO ()
+readFileStore f st = mapM_ addFileLogRecord . B.lines =<< B.readFile f
+  where
+    addFileLogRecord s = case strDecode s of
+      Left e -> B.putStrLn $ "Log parsing error (" <> B.pack e <> "): " <> B.take 100 s
+      Right lr ->
+        atomically (addToStore lr) >>= \case
+          Left e -> B.putStrLn $ "Log processing error (" <> bshow e <> "): " <> B.take 100 s
+          _ -> pure ()
+    addToStore = \case
+      AddFile sId file createdAt -> addFile st sId file createdAt
+      PutFile qId path -> setFilePath st qId path
+      AddRecipients sId rcps -> runExceptT $ addRecipients sId rcps
+      DeleteFile sId -> deleteFile st sId
+      AckFile rId -> ackFile st rId
+    addRecipients sId rcps = mapM_ (ExceptT . addRecipient st sId) rcps
+
+writeFileStore :: StoreLog 'WriteMode -> FileStore -> IO ()
+writeFileStore s FileStore {files, recipients} = do
+  allRcps <- readTVarIO recipients
+  readTVarIO files >>= mapM_ (logFile allRcps)
+  where
+    logFile :: Map RecipientId (SenderId, RcvPublicVerifyKey) -> FileRec -> IO ()
+    logFile allRcps FileRec {senderId, fileInfo, filePath, recipientIds, createdAt} = do
+      logAddFile s senderId fileInfo createdAt
+      (rcpErrs, rcps) <- M.mapEither getRcp . M.fromSet id <$> readTVarIO recipientIds
+      mapM_ (logAddRecipients s senderId) $ L.nonEmpty $ M.elems rcps
+      mapM_ (B.putStrLn . ("Error storing log: " <>)) rcpErrs
+      readTVarIO filePath >>= mapM_ (logPutFile s senderId)
+      where
+        getRcp rId = case M.lookup rId allRcps of
+          Just (sndId, rKey)
+            | sndId == senderId -> Right $ FileRecipient rId rKey
+            | otherwise -> Left $ "sender ID for recipient ID " <> bshow rId <> " does not match FileRec"
+          Nothing -> Left $ "recipient ID " <> bshow rId <> " not found"

src/Simplex/FileTransfer/Transport.hs

@@ -0,0 +1,113 @@
+{-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE MultiWayIf #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+
+module Simplex.FileTransfer.Transport
+  ( supportedFileServerVRange,
+    XFTPRcvChunkSpec (..),
+    sendFile,
+    receiveFile,
+    sendEncFile,
+    receiveEncFile,
+  )
+where
+
+import qualified Control.Exception as E
+import Control.Monad.Except
+import qualified Data.ByteArray as BA
+import Data.ByteString.Builder (Builder, byteString)
+import Data.ByteString.Char8 (ByteString)
+import qualified Data.ByteString.Char8 as B
+import qualified Data.ByteString.Lazy.Char8 as LB
+import Data.Word (Word32)
+import GHC.IO.Handle.Internals (ioe_EOF)
+import Simplex.FileTransfer.Protocol (XFTPErrorType (..))
+import qualified Simplex.Messaging.Crypto as C
+import qualified Simplex.Messaging.Crypto.Lazy as LC
+import Simplex.Messaging.Version
+import System.IO (Handle, IOMode (..), withFile)
+
+data XFTPRcvChunkSpec = XFTPRcvChunkSpec
+  { filePath :: FilePath,
+    chunkSize :: Word32,
+    chunkDigest :: ByteString
+  }
+  deriving (Show)
+
+supportedFileServerVRange :: VersionRange
+supportedFileServerVRange = mkVersionRange 1 1
+
+fileBlockSize :: Int
+fileBlockSize = 16 * 1024
+
+sendFile :: Handle -> (Builder -> IO ()) -> Word32 -> IO ()
+sendFile h send = go
+  where
+    go 0 = pure ()
+    go sz =
+      getFileChunk h sz >>= \ch -> do
+        send $ byteString ch
+        go $ sz - fromIntegral (B.length ch)
+
+sendEncFile :: Handle -> (Builder -> IO ()) -> LC.SbState -> Word32 -> IO ()
+sendEncFile h send = go
+  where
+    go sbState 0 = do
+      let authTag = BA.convert (LC.sbAuth sbState)
+      send $ byteString authTag
+    go sbState sz =
+      getFileChunk h sz >>= \ch -> do
+        let (encCh, sbState') = LC.sbEncryptChunk sbState ch
+        send (byteString encCh) `E.catch` \(e :: E.SomeException) -> print e >> E.throwIO e
+        go sbState' $ sz - fromIntegral (B.length ch)
+
+getFileChunk :: Handle -> Word32 -> IO ByteString
+getFileChunk h sz =
+  B.hGet h fileBlockSize >>= \case
+    "" -> ioe_EOF
+    ch -> pure $ B.take (fromIntegral sz) ch -- sz >= xftpBlockSize
+
+receiveFile :: (Int -> IO ByteString) -> XFTPRcvChunkSpec -> ExceptT XFTPErrorType IO ()
+receiveFile getBody = receiveFile_ receive
+  where
+    receive h sz = do
+      ch <- getBody fileBlockSize
+      let chSize = fromIntegral $ B.length ch
+      if
+          | chSize > sz -> pure $ Left SIZE
+          | chSize > 0 -> B.hPut h ch >> receive h (sz - chSize)
+          | sz == 0 -> pure $ Right ()
+          | otherwise -> pure $ Left SIZE
+
+receiveEncFile :: (Int -> IO ByteString) -> LC.SbState -> XFTPRcvChunkSpec -> ExceptT XFTPErrorType IO ()
+receiveEncFile getBody = receiveFile_ . receive
+  where
+    receive sbState h sz = do
+      ch <- getBody fileBlockSize
+      let chSize = fromIntegral $ B.length ch
+      if
+          | chSize > sz + authSz -> pure $ Left SIZE
+          | chSize > 0 -> do
+            let (ch', rest) = B.splitAt (fromIntegral sz) ch
+                (decCh, sbState') = LC.sbDecryptChunk sbState ch'
+                sz' = sz - fromIntegral (B.length ch')
+            B.hPut h decCh
+            if sz' > 0
+              then receive sbState' h sz'
+              else do
+                let tag' = B.take C.authTagSize rest
+                    tagSz = B.length tag'
+                    tag = LC.sbAuth sbState'
+                tag'' <- if tagSz == C.authTagSize then pure tag' else (tag' <>) <$> getBody (C.authTagSize - tagSz)
+                pure $ if BA.constEq tag'' tag then Right () else Left CRYPTO
+          | otherwise -> pure $ Left SIZE
+    authSz = fromIntegral C.authTagSize
+
+receiveFile_ :: (Handle -> Word32 -> IO (Either XFTPErrorType ())) -> XFTPRcvChunkSpec -> ExceptT XFTPErrorType IO ()
+receiveFile_ receive XFTPRcvChunkSpec {filePath, chunkSize, chunkDigest} = do
+  ExceptT $ withFile filePath WriteMode (`receive` chunkSize)
+  digest' <- liftIO $ LC.sha256Hash <$> LB.readFile filePath
+  when (digest' /= chunkDigest) $ throwError DIGEST

src/Simplex/FileTransfer/Types.hs

@@ -0,0 +1,228 @@
+{-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+module Simplex.FileTransfer.Types where
+
+import Data.Int (Int64)
+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 Simplex.Messaging.Agent.Protocol (RcvFileId, SndFileId)
+import qualified Simplex.Messaging.Crypto as C
+import Simplex.Messaging.Encoding
+import Simplex.Messaging.Encoding.String
+import Simplex.Messaging.Parsers (fromTextField_)
+import Simplex.Messaging.Protocol
+import System.FilePath ((</>))
+
+authTagSize :: Int64
+authTagSize = fromIntegral C.authTagSize
+
+-- fileExtra is added to allow header extension in future versions
+data FileHeader = FileHeader
+  { fileName :: String,
+    fileExtra :: Maybe String
+  }
+  deriving (Eq, Show)
+
+instance Encoding FileHeader where
+  smpEncode FileHeader {fileName, fileExtra} = smpEncode (fileName, fileExtra)
+  smpP = do
+    (fileName, fileExtra) <- smpP
+    pure FileHeader {fileName, fileExtra}
+
+type DBRcvFileId = Int64
+
+data RcvFile = RcvFile
+  { rcvFileId :: DBRcvFileId,
+    rcvFileEntityId :: RcvFileId,
+    userId :: Int64,
+    size :: FileSize Int64,
+    digest :: FileDigest,
+    key :: C.SbKey,
+    nonce :: C.CbNonce,
+    chunkSize :: FileSize Word32,
+    chunks :: [RcvFileChunk],
+    prefixPath :: FilePath,
+    tmpPath :: Maybe FilePath,
+    savePath :: FilePath,
+    status :: RcvFileStatus,
+    deleted :: Bool
+  }
+  deriving (Eq, Show)
+
+data RcvFileStatus
+  = RFSReceiving
+  | RFSReceived
+  | RFSDecrypting
+  | RFSComplete
+  | RFSError
+  deriving (Eq, Show)
+
+instance FromField RcvFileStatus where fromField = fromTextField_ textDecode
+
+instance ToField RcvFileStatus where toField = toField . textEncode
+
+instance TextEncoding RcvFileStatus where
+  textDecode = \case
+    "receiving" -> Just RFSReceiving
+    "received" -> Just RFSReceived
+    "decrypting" -> Just RFSDecrypting
+    "complete" -> Just RFSComplete
+    "error" -> Just RFSError
+    _ -> Nothing
+  textEncode = \case
+    RFSReceiving -> "receiving"
+    RFSReceived -> "received"
+    RFSDecrypting -> "decrypting"
+    RFSComplete -> "complete"
+    RFSError -> "error"
+
+data RcvFileChunk = RcvFileChunk
+  { rcvFileId :: DBRcvFileId,
+    rcvFileEntityId :: RcvFileId,
+    userId :: Int64,
+    rcvChunkId :: Int64,
+    chunkNo :: Int,
+    chunkSize :: FileSize Word32,
+    digest :: FileDigest,
+    replicas :: [RcvFileChunkReplica],
+    fileTmpPath :: FilePath,
+    chunkTmpPath :: Maybe FilePath
+  }
+  deriving (Eq, Show)
+
+data RcvFileChunkReplica = RcvFileChunkReplica
+  { rcvChunkReplicaId :: Int64,
+    server :: XFTPServer,
+    replicaId :: ChunkReplicaId,
+    replicaKey :: C.APrivateSignKey,
+    received :: Bool,
+    delay :: Maybe Int64,
+    retries :: Int
+  }
+  deriving (Eq, Show)
+
+-- Sending files
+
+type DBSndFileId = Int64
+
+data SndFile = SndFile
+  { sndFileId :: DBSndFileId,
+    sndFileEntityId :: SndFileId,
+    userId :: Int64,
+    numRecipients :: Int,
+    digest :: Maybe FileDigest,
+    key :: C.SbKey,
+    nonce :: C.CbNonce,
+    chunks :: [SndFileChunk],
+    filePath :: FilePath,
+    prefixPath :: Maybe FilePath,
+    status :: SndFileStatus,
+    deleted :: Bool
+  }
+  deriving (Eq, Show)
+
+sndFileEncPath :: FilePath -> FilePath
+sndFileEncPath prefixPath = prefixPath </> "xftp.encrypted"
+
+data SndFileStatus
+  = SFSNew -- db record created
+  | SFSEncrypting -- encryption started
+  | SFSEncrypted -- encryption complete
+  | SFSUploading -- all chunk replicas are created on servers
+  | SFSComplete -- all chunk replicas are uploaded
+  | SFSError -- permanent error
+  deriving (Eq, Show)
+
+instance FromField SndFileStatus where fromField = fromTextField_ textDecode
+
+instance ToField SndFileStatus where toField = toField . textEncode
+
+instance TextEncoding SndFileStatus where
+  textDecode = \case
+    "new" -> Just SFSNew
+    "encrypting" -> Just SFSEncrypting
+    "encrypted" -> Just SFSEncrypted
+    "uploading" -> Just SFSUploading
+    "complete" -> Just SFSComplete
+    "error" -> Just SFSError
+    _ -> Nothing
+  textEncode = \case
+    SFSNew -> "new"
+    SFSEncrypting -> "encrypting"
+    SFSEncrypted -> "encrypted"
+    SFSUploading -> "uploading"
+    SFSComplete -> "complete"
+    SFSError -> "error"
+
+data SndFileChunk = SndFileChunk
+  { sndFileId :: DBSndFileId,
+    sndFileEntityId :: SndFileId,
+    userId :: Int64,
+    numRecipients :: Int,
+    sndChunkId :: Int64,
+    chunkNo :: Int,
+    chunkSpec :: XFTPChunkSpec,
+    filePrefixPath :: FilePath,
+    digest :: FileDigest,
+    replicas :: [SndFileChunkReplica]
+  }
+  deriving (Eq, Show)
+
+sndChunkSize :: SndFileChunk -> Word32
+sndChunkSize SndFileChunk {chunkSpec = XFTPChunkSpec {chunkSize}} = chunkSize
+
+data NewSndChunkReplica = NewSndChunkReplica
+  { server :: XFTPServer,
+    replicaId :: ChunkReplicaId,
+    replicaKey :: C.APrivateSignKey,
+    rcvIdsKeys :: [(ChunkReplicaId, C.APrivateSignKey)]
+  }
+  deriving (Eq, Show)
+
+data SndFileChunkReplica = SndFileChunkReplica
+  { sndChunkReplicaId :: Int64,
+    server :: XFTPServer,
+    replicaId :: ChunkReplicaId,
+    replicaKey :: C.APrivateSignKey,
+    rcvIdsKeys :: [(ChunkReplicaId, C.APrivateSignKey)],
+    replicaStatus :: SndFileReplicaStatus,
+    delay :: Maybe Int64,
+    retries :: Int
+  }
+  deriving (Eq, Show)
+
+data SndFileReplicaStatus
+  = SFRSCreated
+  | SFRSUploaded
+  deriving (Eq, Show)
+
+instance FromField SndFileReplicaStatus where fromField = fromTextField_ textDecode
+
+instance ToField SndFileReplicaStatus where toField = toField . textEncode
+
+instance TextEncoding SndFileReplicaStatus where
+  textDecode = \case
+    "created" -> Just SFRSCreated
+    "uploaded" -> Just SFRSUploaded
+    _ -> Nothing
+  textEncode = \case
+    SFRSCreated -> "created"
+    SFRSUploaded -> "uploaded"
+
+data DeletedSndChunkReplica = DeletedSndChunkReplica
+  { deletedSndChunkReplicaId :: Int64,
+    userId :: Int64,
+    server :: XFTPServer,
+    replicaId :: ChunkReplicaId,
+    replicaKey :: C.APrivateSignKey,
+    chunkDigest :: FileDigest,
+    delay :: Maybe Int64,
+    retries :: Int
+  }
+  deriving (Eq, Show)

src/Simplex/FileTransfer/Util.hs

@@ -0,0 +1,24 @@
+module Simplex.FileTransfer.Util
+  ( uniqueCombine,
+    removePath,
+  )
+where
+
+import Simplex.Messaging.Util (ifM, whenM)
+import System.FilePath (splitExtensions, (</>))
+import UnliftIO
+import UnliftIO.Directory
+
+uniqueCombine :: MonadIO m => FilePath -> String -> m FilePath
+uniqueCombine filePath fileName = tryCombine (0 :: Int)
+  where
+    tryCombine n =
+      let (name, ext) = splitExtensions fileName
+          suffix = if n == 0 then "" else "_" <> show n
+          f = filePath </> (name <> suffix <> ext)
+       in ifM (doesPathExist f) (tryCombine $ n + 1) (pure f)
+
+removePath :: MonadIO m => FilePath -> m ()
+removePath p = do
+  ifM (doesDirectoryExist p) (removeDirectoryRecursive p) $
+    whenM (doesFileExist p) (removeFile p)

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

@@ -3,7 +3,6 @@
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE GADTs #-}
-{-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE NumericUnderscores #-}
 {-# LANGUAGE RankNTypes #-}
@@ -12,9 +11,8 @@
 
 module Simplex.Messaging.Agent.Env.SQLite
   ( AgentMonad,
+    AgentMonad',
     AgentConfig (..),
-    AgentDatabase (..),
-    databaseFile,
     InitialAgentServers (..),
     NetworkConfig (..),
     defaultAgentConfig,
@@ -24,6 +22,7 @@ module Simplex.Messaging.Agent.Env.SQLite
     createAgentStore,
     NtfSupervisor (..),
     NtfSupervisorCommand (..),
+    XFTPAgent (..),
   )
 where
 
@@ -31,11 +30,14 @@ import Control.Monad.Except
 import Control.Monad.IO.Unlift
 import Control.Monad.Reader
 import Crypto.Random
+import Data.Int (Int64)
 import Data.List.NonEmpty (NonEmpty)
+import Data.Map (Map)
 import Data.Time.Clock (NominalDiffTime, nominalDay)
 import Data.Word (Word16)
 import Network.Socket
 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
@@ -45,7 +47,7 @@ import Simplex.Messaging.Client.Agent ()
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Crypto.Ratchet (supportedE2EEncryptVRange)
 import Simplex.Messaging.Notifications.Types
-import Simplex.Messaging.Protocol (NtfServer, supportedSMPClientVRange)
+import Simplex.Messaging.Protocol (NtfServer, XFTPServer, XFTPServerWithAuth, supportedSMPClientVRange)
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
 import Simplex.Messaging.Transport (TLS, Transport (..))
@@ -55,37 +57,37 @@ import System.Random (StdGen, newStdGen)
 import UnliftIO (Async)
 import UnliftIO.STM
 
--- | Agent monad with MonadReader Env and MonadError AgentErrorType
-type AgentMonad m = (MonadUnliftIO m, MonadReader Env m, MonadError AgentErrorType m)
+type AgentMonad' m = (MonadUnliftIO m, MonadReader Env m)
+
+type AgentMonad m = (AgentMonad' m, MonadError AgentErrorType m)
 
 data InitialAgentServers = InitialAgentServers
-  { smp :: NonEmpty SMPServerWithAuth,
+  { smp :: Map UserId (NonEmpty SMPServerWithAuth),
     ntf :: [NtfServer],
+    xftp :: Map UserId (NonEmpty XFTPServerWithAuth),
     netCfg :: NetworkConfig
   }
 
-data AgentDatabase
-  = AgentDB SQLiteStore
-  | AgentDBFile {dbFile :: FilePath, dbKey :: String}
-
-databaseFile :: AgentDatabase -> FilePath
-databaseFile = \case
-  AgentDB SQLiteStore {dbFilePath} -> dbFilePath
-  AgentDBFile {dbFile} -> dbFile
-
 data AgentConfig = AgentConfig
   { tcpPort :: ServiceName,
     cmdSignAlg :: C.SignAlg,
     connIdBytes :: Int,
     tbqSize :: Natural,
-    database :: AgentDatabase,
-    yesToMigrations :: Bool,
     smpCfg :: ProtocolClientConfig,
     ntfCfg :: ProtocolClientConfig,
+    xftpCfg :: XFTPClientConfig,
     reconnectInterval :: RetryInterval,
     messageRetryInterval :: RetryInterval2,
     messageTimeout :: NominalDiffTime,
     helloTimeout :: NominalDiffTime,
+    initialCleanupDelay :: Int64,
+    cleanupInterval :: Int64,
+    rcvMsgHashesTTL :: NominalDiffTime,
+    rcvFilesTTL :: NominalDiffTime,
+    sndFilesTTL :: NominalDiffTime,
+    xftpNotifyErrsOnRetry :: Bool,
+    xftpMaxRecipientsPerRequest :: Int,
+    deleteErrorCount :: Int,
     ntfCron :: Word16,
     ntfWorkerDelay :: Int,
     ntfSMPWorkerDelay :: Int,
@@ -118,13 +120,13 @@ defaultMessageRetryInterval =
             maxInterval = 60_000000
           },
       riSlow =
-        -- TODO: these timeouts can be increased in v4.6 once most clients are updated
+        -- TODO: these timeouts can be increased in v5.0 once most clients are updated
         -- to resume sending on QCONT messages.
         -- After that local message expiration period should be also increased.
         RetryInterval
-          { initialInterval = 10_000000,
-            increaseAfter = 30_000000,
-            maxInterval = 300_000000
+          { initialInterval = 60_000000,
+            increaseAfter = 60_000000,
+            maxInterval = 3600_000000 -- 1 hour
           }
     }
 
@@ -135,14 +137,21 @@ defaultAgentConfig =
       cmdSignAlg = C.SignAlg C.SEd448,
       connIdBytes = 12,
       tbqSize = 64,
-      database = AgentDBFile {dbFile = "smp-agent.db", dbKey = ""},
-      yesToMigrations = False,
       smpCfg = defaultClientConfig {defaultTransport = (show defaultSMPPort, transport @TLS)},
       ntfCfg = defaultClientConfig {defaultTransport = ("443", transport @TLS)},
+      xftpCfg = defaultXFTPClientConfig,
       reconnectInterval = defaultReconnectInterval,
       messageRetryInterval = defaultMessageRetryInterval,
       messageTimeout = 2 * nominalDay,
       helloTimeout = 2 * nominalDay,
+      initialCleanupDelay = 30 * 1000000, -- 30 seconds
+      cleanupInterval = 30 * 60 * 1000000, -- 30 minutes
+      rcvMsgHashesTTL = 30 * nominalDay,
+      rcvFilesTTL = 2 * nominalDay,
+      sndFilesTTL = nominalDay,
+      xftpNotifyErrsOnRetry = True,
+      xftpMaxRecipientsPerRequest = 200,
+      deleteErrorCount = 10,
       ntfCron = 20, -- minutes
       ntfWorkerDelay = 100000, -- microseconds
       ntfSMPWorkerDelay = 500000, -- microseconds
@@ -165,21 +174,20 @@ data Env = Env
     idsDrg :: TVar ChaChaDRG,
     clientCounter :: TVar Int,
     randomServer :: TVar StdGen,
-    ntfSupervisor :: NtfSupervisor
+    ntfSupervisor :: NtfSupervisor,
+    xftpAgent :: XFTPAgent
   }
 
-newSMPAgentEnv :: (MonadUnliftIO m, MonadRandom m) => AgentConfig -> m Env
-newSMPAgentEnv config@AgentConfig {database, yesToMigrations, initialClientId} = do
-  idsDrg <- newTVarIO =<< drgNew
-  store <- case database of
-    AgentDB st -> pure st
-    AgentDBFile {dbFile, dbKey} -> liftIO $ createAgentStore dbFile dbKey yesToMigrations
+newSMPAgentEnv :: AgentConfig -> SQLiteStore -> IO Env
+newSMPAgentEnv config@AgentConfig {initialClientId} store = do
+  idsDrg <- newTVarIO =<< liftIO drgNew
   clientCounter <- newTVarIO initialClientId
   randomServer <- newTVarIO =<< liftIO newStdGen
   ntfSupervisor <- atomically . newNtfSubSupervisor $ tbqSize config
-  return Env {config, store, idsDrg, clientCounter, randomServer, ntfSupervisor}
+  xftpAgent <- atomically newXFTPAgent
+  pure Env {config, store, idsDrg, clientCounter, randomServer, ntfSupervisor, xftpAgent}
 
-createAgentStore :: FilePath -> String -> Bool -> IO SQLiteStore
+createAgentStore :: FilePath -> String -> MigrationConfirmation -> IO (Either MigrationError SQLiteStore)
 createAgentStore dbFilePath dbKey = createSQLiteStore dbFilePath dbKey Migrations.app
 
 data NtfSupervisor = NtfSupervisor
@@ -199,3 +207,19 @@ newNtfSubSupervisor qSize = do
   ntfWorkers <- TM.empty
   ntfSMPWorkers <- TM.empty
   pure NtfSupervisor {ntfTkn, ntfSubQ, ntfWorkers, ntfSMPWorkers}
+
+data XFTPAgent = XFTPAgent
+  { -- if set, XFTP file paths will be considered as relative to this directory
+    xftpWorkDir :: TVar (Maybe FilePath),
+    xftpRcvWorkers :: TMap (Maybe XFTPServer) (TMVar (), Async ()),
+    xftpSndWorkers :: TMap (Maybe XFTPServer) (TMVar (), Async ()),
+    xftpDelWorkers :: TMap XFTPServer (TMVar (), Async ())
+  }
+
+newXFTPAgent :: STM XFTPAgent
+newXFTPAgent = do
+  xftpWorkDir <- newTVar Nothing
+  xftpRcvWorkers <- TM.empty
+  xftpSndWorkers <- TM.empty
+  xftpDelWorkers <- TM.empty
+  pure XFTPAgent {xftpWorkDir, xftpRcvWorkers, xftpSndWorkers, xftpDelWorkers}

src/Simplex/Messaging/Agent/Lock.hs

@@ -10,7 +10,11 @@ import UnliftIO.STM
 
 type Lock = TMVar String
 
-withLock :: MonadUnliftIO m => TMVar String -> String -> m a -> m a
+createLock :: STM Lock
+createLock = newEmptyTMVar
+{-# INLINE createLock #-}
+
+withLock :: MonadUnliftIO m => Lock -> String -> m a -> m a
 withLock lock name =
   E.bracket_
     (atomically $ putTMVar lock name)

src/Simplex/Messaging/Agent/NtfSubSupervisor.hs

@@ -17,22 +17,19 @@ module Simplex.Messaging.Agent.NtfSubSupervisor
   )
 where
 
-import Control.Concurrent.Async (Async, uninterruptibleCancel)
 import Control.Concurrent.STM (stateTVar)
 import Control.Logger.Simple (logError, logInfo)
 import Control.Monad
 import Control.Monad.Except
-import Control.Monad.IO.Unlift (MonadUnliftIO)
 import Control.Monad.Reader
 import Data.Bifunctor (first)
-import Data.Fixed (Fixed (MkFixed), Pico)
 import qualified Data.Map.Strict as M
 import Data.Text (Text)
-import Data.Time (UTCTime, addUTCTime, diffUTCTime, getCurrentTime, nominalDiffTimeToSeconds)
+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 (AgentErrorType (..), BrokerErrorType (..), ConnId, NotificationsMode (..))
-import qualified Simplex.Messaging.Agent.Protocol as AP
+import Simplex.Messaging.Agent.Protocol (ACommand (..), APartyCmd (..), AgentErrorType (..), BrokerErrorType (..), ConnId, NotificationsMode (..), SAEntity (..))
 import Simplex.Messaging.Agent.RetryInterval
 import Simplex.Messaging.Agent.Store
 import Simplex.Messaging.Agent.Store.SQLite
@@ -40,17 +37,16 @@ import Simplex.Messaging.Client.Agent ()
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Notifications.Protocol (NtfSubStatus (..), NtfTknStatus (..), SMPQueueNtf (..))
 import Simplex.Messaging.Notifications.Types
-import Simplex.Messaging.Protocol
+import Simplex.Messaging.Protocol (NtfServer, ProtocolServer, SMPServer, sameSrvAddr)
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
-import Simplex.Messaging.Util (tshow, unlessM)
+import Simplex.Messaging.Util (diffToMicroseconds, threadDelay', tshow, unlessM)
 import System.Random (randomR)
-import UnliftIO (async)
+import UnliftIO
 import UnliftIO.Concurrent (forkIO, threadDelay)
 import qualified UnliftIO.Exception as E
-import UnliftIO.STM
 
-runNtfSupervisor :: forall m. (MonadUnliftIO m, MonadReader Env m) => AgentClient -> m ()
+runNtfSupervisor :: forall m. AgentMonad' m => AgentClient -> m ()
 runNtfSupervisor c = do
   ns <- asks ntfSupervisor
   forever $ do
@@ -82,11 +78,11 @@ processNtfSub c (connId, cmd) = do
             case clientNtfCreds of
               Just ClientNtfCreds {notifierId} -> do
                 let newSub = newNtfSubscription connId smpServer (Just notifierId) ntfServer NASKey
-                withStore' c $ \db -> createNtfSubscription db newSub $ NtfSubNTFAction NSACreate
+                withStore c $ \db -> createNtfSubscription db newSub $ NtfSubNTFAction NSACreate
                 addNtfNTFWorker ntfServer
               Nothing -> do
                 let newSub = newNtfSubscription connId smpServer Nothing ntfServer NASNew
-                withStore' c $ \db -> createNtfSubscription db newSub $ NtfSubSMPAction NSASmpKey
+                withStore c $ \db -> createNtfSubscription db newSub $ NtfSubSMPAction NSASmpKey
                 addNtfSMPWorker smpServer
         (Just (sub@NtfSubscription {ntfSubStatus, ntfServer = subNtfServer, smpServer = smpServer', ntfQueueId}, action_)) -> do
           case (clientNtfCreds, ntfQueueId) of
@@ -156,7 +152,7 @@ processNtfSub c (connId, cmd) = do
         Just (doWork, _) ->
           void . atomically $ tryPutTMVar doWork ()
 
-withNtfServer :: AgentMonad m => AgentClient -> (NtfServer -> m ()) -> m ()
+withNtfServer :: AgentMonad' m => AgentClient -> (NtfServer -> m ()) -> m ()
 withNtfServer c action = getNtfServer c >>= mapM_ action
 
 runNtfWorker :: forall m. AgentMonad m => AgentClient -> NtfServer -> TMVar () -> m ()
@@ -175,7 +171,7 @@ runNtfWorker c srv doWork = do
         Nothing -> noWorkToDo
         Just a@(NtfSubscription {connId}, _, _) -> do
           ri <- asks $ reconnectInterval . config
-          withRetryInterval ri $ \loop ->
+          withRetryInterval ri $ \_ loop ->
             processAction a
               `catchError` retryOnError c "NtfWorker" loop (workerInternalError c connId . show)
     noWorkToDo = void . atomically $ tryTakeTMVar doWork
@@ -259,7 +255,7 @@ runNtfSMPWorker c srv doWork = do
         Nothing -> noWorkToDo
         Just a@(NtfSubscription {connId}, _, _) -> do
           ri <- asks $ reconnectInterval . config
-          withRetryInterval ri $ \loop ->
+          withRetryInterval ri $ \_ loop ->
             processAction a
               `catchError` retryOnError c "NtfSMPWorker" loop (workerInternalError c connId . show)
     noWorkToDo = void . atomically $ tryTakeTMVar doWork
@@ -290,23 +286,17 @@ runNtfSMPWorker c srv doWork = do
             mapM_ (disableQueueNotifications c) rq_
             withStore' c $ \db -> deleteNtfSubscription db connId
 
-rescheduleAction :: AgentMonad m => TMVar () -> UTCTime -> UTCTime -> m Bool
+rescheduleAction :: AgentMonad' m => TMVar () -> UTCTime -> UTCTime -> m Bool
 rescheduleAction doWork ts actionTs
   | actionTs <= ts = pure False
   | otherwise = do
     void . atomically $ tryTakeTMVar doWork
     void . forkIO $ do
-      threadDelay $ diffInMicros actionTs ts
+      liftIO $ threadDelay' $ diffToMicroseconds $ diffUTCTime actionTs ts
       void . atomically $ tryPutTMVar doWork ()
     pure True
 
-fromPico :: Pico -> Integer
-fromPico (MkFixed i) = i
-
-diffInMicros :: UTCTime -> UTCTime -> Int
-diffInMicros a b = (`div` 1000000) . fromInteger . fromPico . nominalDiffTimeToSeconds $ diffUTCTime a b
-
-retryOnError :: AgentMonad m => AgentClient -> Text -> m () -> (AgentErrorType -> m ()) -> AgentErrorType -> m ()
+retryOnError :: AgentMonad' m => AgentClient -> Text -> m () -> (AgentErrorType -> m ()) -> AgentErrorType -> m ()
 retryOnError c name loop done e = do
   logError $ name <> " error: " <> tshow e
   case e of
@@ -325,10 +315,11 @@ workerInternalError c connId internalErrStr = do
   withStore' c $ \db -> setNullNtfSubscriptionAction db connId
   notifyInternalError c connId internalErrStr
 
-notifyInternalError :: (MonadUnliftIO m) => AgentClient -> ConnId -> String -> m ()
-notifyInternalError AgentClient {subQ} connId internalErrStr = atomically $ writeTBQueue subQ ("", connId, AP.ERR $ AP.INTERNAL internalErrStr)
+-- TODO change error
+notifyInternalError :: MonadUnliftIO m => AgentClient -> ConnId -> String -> m ()
+notifyInternalError AgentClient {subQ} connId internalErrStr = atomically $ writeTBQueue subQ ("", connId, APC SAEConn $ ERR $ INTERNAL internalErrStr)
 
-getNtfToken :: AgentMonad m => m (Maybe NtfToken)
+getNtfToken :: AgentMonad' m => m (Maybe NtfToken)
 getNtfToken = do
   tkn <- asks $ ntfTkn . ntfSupervisor
   readTVarIO tkn
@@ -349,17 +340,17 @@ instantNotifications = \case
   Just NtfToken {ntfTknStatus = NTActive, ntfMode = NMInstant} -> True
   _ -> False
 
-closeNtfSupervisor :: NtfSupervisor -> IO ()
+closeNtfSupervisor :: MonadUnliftIO m => NtfSupervisor -> m ()
 closeNtfSupervisor ns = do
   cancelNtfWorkers_ $ ntfWorkers ns
   cancelNtfWorkers_ $ ntfSMPWorkers ns
 
-cancelNtfWorkers_ :: TMap (ProtocolServer s) (TMVar (), Async ()) -> IO ()
+cancelNtfWorkers_ :: MonadUnliftIO m => TMap (ProtocolServer s) (TMVar (), Async ()) -> m ()
 cancelNtfWorkers_ wsVar = do
   ws <- atomically $ stateTVar wsVar (,M.empty)
   mapM_ (uninterruptibleCancel . snd) ws
 
-getNtfServer :: AgentMonad m => AgentClient -> m (Maybe NtfServer)
+getNtfServer :: AgentMonad' m => AgentClient -> m (Maybe NtfServer)
 getNtfServer c = do
   ntfServers <- readTVarIO $ ntfServers c
   case ntfServers of

src/Simplex/Messaging/Agent/Protocol.hs

@@ -40,17 +40,27 @@ module Simplex.Messaging.Agent.Protocol
     -- * SMP agent protocol types
     ConnInfo,
     ACommand (..),
+    APartyCmd (..),
     ACommandTag (..),
     aCommandTag,
+    aPartyCmdTag,
     ACmd (..),
+    APartyCmdTag (..),
     ACmdTag (..),
     AParty (..),
+    AEntity (..),
     SAParty (..),
+    SAEntity (..),
     APartyI (..),
+    AEntityI (..),
     MsgHash,
     MsgMeta (..),
+    RcvQueueInfo (..),
+    SndQueueInfo (..),
     ConnectionStats (..),
     SwitchPhase (..),
+    RcvSwitchStatus (..),
+    SndSwitchStatus (..),
     QueueDirection (..),
     SMPConfirmation (..),
     AgentMsgEnvelope (..),
@@ -87,15 +97,19 @@ module Simplex.Messaging.Agent.Protocol
     ConnectionErrorType (..),
     BrokerErrorType (..),
     SMPAgentError (..),
+    AgentCryptoError (..),
     ATransmission,
     ATransmissionOrError,
     ARawTransmission,
     ConnId,
+    RcvFileId,
+    SndFileId,
     ConfirmationId,
     InvitationId,
     MsgIntegrity (..),
     MsgErrorType (..),
     QueueStatus (..),
+    UserId,
     ACorrId,
     AgentMsgId,
     NotificationsMode (..),
@@ -125,6 +139,8 @@ module Simplex.Messaging.Agent.Protocol
 where
 
 import Control.Applicative (optional, (<|>))
+import Control.Monad (unless)
+import Control.Monad.Except (runExceptT, throwError)
 import Control.Monad.IO.Class
 import Data.Aeson (FromJSON (..), ToJSON (..))
 import qualified Data.Aeson as J
@@ -143,16 +159,19 @@ import qualified Data.Map as M
 import Data.Maybe (isJust)
 import Data.Text (Text)
 import qualified Data.Text as T
-import Data.Text.Encoding (encodeUtf8)
+import Data.Text.Encoding (decodeLatin1, encodeUtf8)
 import Data.Time.Clock (UTCTime)
 import Data.Time.Clock.System (SystemTime)
 import Data.Time.ISO8601
 import Data.Type.Equality
 import Data.Typeable ()
+import Data.Word (Word32)
 import Database.SQLite.Simple.FromField
 import Database.SQLite.Simple.ToField
 import GHC.Generics (Generic)
 import Generic.Random (genericArbitraryU)
+import Simplex.FileTransfer.Description
+import Simplex.FileTransfer.Protocol (FileParty (..), XFTPErrorType)
 import Simplex.Messaging.Agent.QueryString
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Crypto.Ratchet (E2ERatchetParams, E2ERatchetParamsUri)
@@ -161,6 +180,7 @@ import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Parsers
 import Simplex.Messaging.Protocol
   ( AProtocolType,
+    EntityId,
     ErrorType,
     MsgBody,
     MsgFlags,
@@ -207,10 +227,12 @@ e2eEncUserMsgLength = 15856
 type ARawTransmission = (ByteString, ByteString, ByteString)
 
 -- | Parsed SMP agent protocol transmission.
-type ATransmission p = (ACorrId, ConnId, ACommand p)
+type ATransmission p = (ACorrId, EntityId, APartyCmd p)
 
 -- | SMP agent protocol transmission or transmission error.
-type ATransmissionOrError p = (ACorrId, ConnId, Either AgentErrorType (ACommand p))
+type ATransmissionOrError p = (ACorrId, EntityId, Either AgentErrorType (APartyCmd p))
+
+type UserId = Int64
 
 type ACorrId = ByteString
 
@@ -238,90 +260,161 @@ instance APartyI Agent where sAParty = SAgent
 
 instance APartyI Client where sAParty = SClient
 
-data ACmd = forall p. APartyI p => ACmd (SAParty p) (ACommand p)
+data AEntity = AEConn | AERcvFile | AESndFile | AENone
+  deriving (Eq, Show)
+
+data SAEntity :: AEntity -> Type where
+  SAEConn :: SAEntity AEConn
+  SAERcvFile :: SAEntity AERcvFile
+  SAESndFile :: SAEntity AESndFile
+  SAENone :: SAEntity AENone
+
+deriving instance Show (SAEntity e)
+
+deriving instance Eq (SAEntity e)
+
+instance TestEquality SAEntity where
+  testEquality SAEConn SAEConn = Just Refl
+  testEquality SAERcvFile SAERcvFile = Just Refl
+  testEquality SAESndFile SAESndFile = Just Refl
+  testEquality SAENone SAENone = Just Refl
+  testEquality _ _ = Nothing
+
+class AEntityI (e :: AEntity) where sAEntity :: SAEntity e
+
+instance AEntityI AEConn where sAEntity = SAEConn
+
+instance AEntityI AERcvFile where sAEntity = SAERcvFile
+
+instance AEntityI AESndFile where sAEntity = SAESndFile
+
+instance AEntityI AENone where sAEntity = SAENone
+
+data ACmd = forall p e. (APartyI p, AEntityI e) => ACmd (SAParty p) (SAEntity e) (ACommand p e)
 
 deriving instance Show ACmd
 
+data APartyCmd p = forall e. AEntityI e => APC (SAEntity e) (ACommand p e)
+
+instance Eq (APartyCmd p) where
+  APC e cmd == APC e' cmd' = case testEquality e e' of
+    Just Refl -> cmd == cmd'
+    Nothing -> False
+
+deriving instance Show (APartyCmd p)
+
 type ConnInfo = ByteString
 
 -- | Parameterized type for SMP agent protocol commands and responses from all participants.
-data ACommand (p :: AParty) where
-  NEW :: Bool -> AConnectionMode -> ACommand Client -- response INV
-  INV :: AConnectionRequestUri -> ACommand Agent
-  JOIN :: Bool -> AConnectionRequestUri -> ConnInfo -> ACommand Client -- response OK
-  CONF :: ConfirmationId -> [SMPServer] -> ConnInfo -> ACommand Agent -- ConnInfo is from sender, [SMPServer] will be empty only in v1 handshake
-  LET :: ConfirmationId -> ConnInfo -> ACommand Client -- ConnInfo is from client
-  REQ :: InvitationId -> L.NonEmpty SMPServer -> ConnInfo -> ACommand Agent -- ConnInfo is from sender
-  ACPT :: InvitationId -> ConnInfo -> ACommand Client -- ConnInfo is from client
-  RJCT :: InvitationId -> ACommand Client
-  INFO :: ConnInfo -> ACommand Agent
-  CON :: ACommand Agent -- notification that connection is established
-  SUB :: ACommand Client
-  END :: ACommand Agent
-  CONNECT :: AProtocolType -> TransportHost -> ACommand Agent
-  DISCONNECT :: AProtocolType -> TransportHost -> ACommand Agent
-  DOWN :: SMPServer -> [ConnId] -> ACommand Agent
-  UP :: SMPServer -> [ConnId] -> ACommand Agent
-  SWITCH :: QueueDirection -> SwitchPhase -> ConnectionStats -> ACommand Agent
-  SEND :: MsgFlags -> MsgBody -> ACommand Client
-  MID :: AgentMsgId -> ACommand Agent
-  SENT :: AgentMsgId -> ACommand Agent
-  MERR :: AgentMsgId -> AgentErrorType -> ACommand Agent
-  MSG :: MsgMeta -> MsgFlags -> MsgBody -> ACommand Agent
-  ACK :: AgentMsgId -> ACommand Client
-  SWCH :: ACommand Client
-  OFF :: ACommand Client
-  DEL :: ACommand Client
-  CHK :: ACommand Client
-  STAT :: ConnectionStats -> ACommand Agent
-  OK :: ACommand Agent
-  ERR :: AgentErrorType -> ACommand Agent
-  SUSPENDED :: ACommand Agent
+data ACommand (p :: AParty) (e :: AEntity) where
+  NEW :: Bool -> AConnectionMode -> ACommand Client AEConn -- response INV
+  INV :: AConnectionRequestUri -> ACommand Agent AEConn
+  JOIN :: Bool -> AConnectionRequestUri -> ConnInfo -> ACommand Client AEConn -- response OK
+  CONF :: ConfirmationId -> [SMPServer] -> ConnInfo -> ACommand Agent AEConn -- ConnInfo is from sender, [SMPServer] will be empty only in v1 handshake
+  LET :: ConfirmationId -> ConnInfo -> ACommand Client AEConn -- ConnInfo is from client
+  REQ :: InvitationId -> L.NonEmpty SMPServer -> ConnInfo -> ACommand Agent AEConn -- ConnInfo is from sender
+  ACPT :: InvitationId -> ConnInfo -> ACommand Client AEConn -- ConnInfo is from client
+  RJCT :: InvitationId -> ACommand Client AEConn
+  INFO :: ConnInfo -> ACommand Agent AEConn
+  CON :: ACommand Agent AEConn -- notification that connection is established
+  SUB :: ACommand Client AEConn
+  END :: ACommand Agent AEConn
+  CONNECT :: AProtocolType -> TransportHost -> ACommand Agent AENone
+  DISCONNECT :: AProtocolType -> TransportHost -> ACommand Agent AENone
+  DOWN :: SMPServer -> [ConnId] -> ACommand Agent AENone
+  UP :: SMPServer -> [ConnId] -> ACommand Agent AENone
+  SWITCH :: QueueDirection -> SwitchPhase -> ConnectionStats -> ACommand Agent AEConn
+  SEND :: MsgFlags -> MsgBody -> ACommand Client AEConn
+  MID :: AgentMsgId -> ACommand Agent AEConn
+  SENT :: AgentMsgId -> ACommand Agent AEConn
+  MERR :: AgentMsgId -> AgentErrorType -> ACommand Agent AEConn
+  MSG :: MsgMeta -> MsgFlags -> MsgBody -> ACommand Agent AEConn
+  ACK :: AgentMsgId -> ACommand Client AEConn
+  SWCH :: ACommand Client AEConn
+  OFF :: ACommand Client AEConn
+  DEL :: ACommand Client AEConn
+  DEL_RCVQ :: SMPServer -> SMP.RecipientId -> Maybe AgentErrorType -> ACommand Agent AEConn
+  DEL_CONN :: ACommand Agent AEConn
+  DEL_USER :: Int64 -> ACommand Agent AENone
+  CHK :: ACommand Client AEConn
+  STAT :: ConnectionStats -> ACommand Agent AEConn
+  OK :: ACommand Agent AEConn
+  ERR :: AgentErrorType -> ACommand Agent AEConn
+  SUSPENDED :: ACommand Agent AENone
+  -- XFTP commands and responses
+  RFPROG :: Int64 -> Int64 -> ACommand Agent AERcvFile
+  RFDONE :: FilePath -> ACommand Agent AERcvFile
+  RFERR :: AgentErrorType -> ACommand Agent AERcvFile
+  SFPROG :: Int64 -> Int64 -> ACommand Agent AESndFile
+  SFDONE :: ValidFileDescription 'FSender -> [ValidFileDescription 'FRecipient] -> ACommand Agent AESndFile
+  SFERR :: AgentErrorType -> ACommand Agent AESndFile
 
-deriving instance Eq (ACommand p)
+deriving instance Eq (ACommand p e)
 
-deriving instance Show (ACommand p)
+deriving instance Show (ACommand p e)
 
-data ACmdTag = forall p. APartyI p => ACmdTag (SAParty p) (ACommandTag p)
+data ACmdTag = forall p e. (APartyI p, AEntityI e) => ACmdTag (SAParty p) (SAEntity e) (ACommandTag p e)
 
-data ACommandTag (p :: AParty) where
-  NEW_ :: ACommandTag Client
-  INV_ :: ACommandTag Agent
-  JOIN_ :: ACommandTag Client
-  CONF_ :: ACommandTag Agent
-  LET_ :: ACommandTag Client
-  REQ_ :: ACommandTag Agent
-  ACPT_ :: ACommandTag Client
-  RJCT_ :: ACommandTag Client
-  INFO_ :: ACommandTag Agent
-  CON_ :: ACommandTag Agent
-  SUB_ :: ACommandTag Client
-  END_ :: ACommandTag Agent
-  CONNECT_ :: ACommandTag Agent
-  DISCONNECT_ :: ACommandTag Agent
-  DOWN_ :: ACommandTag Agent
-  UP_ :: ACommandTag Agent
-  SWITCH_ :: ACommandTag Agent
-  SEND_ :: ACommandTag Client
-  MID_ :: ACommandTag Agent
-  SENT_ :: ACommandTag Agent
-  MERR_ :: ACommandTag Agent
-  MSG_ :: ACommandTag Agent
-  ACK_ :: ACommandTag Client
-  SWCH_ :: ACommandTag Client
-  OFF_ :: ACommandTag Client
-  DEL_ :: ACommandTag Client
-  CHK_ :: ACommandTag Client
-  STAT_ :: ACommandTag Agent
-  OK_ :: ACommandTag Agent
-  ERR_ :: ACommandTag Agent
-  SUSPENDED_ :: ACommandTag Agent
+data APartyCmdTag p = forall e. AEntityI e => APCT (SAEntity e) (ACommandTag p e)
 
-deriving instance Eq (ACommandTag p)
+instance Eq (APartyCmdTag p) where
+  APCT e cmd == APCT e' cmd' = case testEquality e e' of
+    Just Refl -> cmd == cmd'
+    Nothing -> False
 
-deriving instance Show (ACommandTag p)
+deriving instance Show (APartyCmdTag p)
 
-aCommandTag :: ACommand p -> ACommandTag p
+data ACommandTag (p :: AParty) (e :: AEntity) where
+  NEW_ :: ACommandTag Client AEConn
+  INV_ :: ACommandTag Agent AEConn
+  JOIN_ :: ACommandTag Client AEConn
+  CONF_ :: ACommandTag Agent AEConn
+  LET_ :: ACommandTag Client AEConn
+  REQ_ :: ACommandTag Agent AEConn
+  ACPT_ :: ACommandTag Client AEConn
+  RJCT_ :: ACommandTag Client AEConn
+  INFO_ :: ACommandTag Agent AEConn
+  CON_ :: ACommandTag Agent AEConn
+  SUB_ :: ACommandTag Client AEConn
+  END_ :: ACommandTag Agent AEConn
+  CONNECT_ :: ACommandTag Agent AENone
+  DISCONNECT_ :: ACommandTag Agent AENone
+  DOWN_ :: ACommandTag Agent AENone
+  UP_ :: ACommandTag Agent AENone
+  SWITCH_ :: ACommandTag Agent AEConn
+  SEND_ :: ACommandTag Client AEConn
+  MID_ :: ACommandTag Agent AEConn
+  SENT_ :: ACommandTag Agent AEConn
+  MERR_ :: ACommandTag Agent AEConn
+  MSG_ :: ACommandTag Agent AEConn
+  ACK_ :: ACommandTag Client AEConn
+  SWCH_ :: ACommandTag Client AEConn
+  OFF_ :: ACommandTag Client AEConn
+  DEL_ :: ACommandTag Client AEConn
+  DEL_RCVQ_ :: ACommandTag Agent AEConn
+  DEL_CONN_ :: ACommandTag Agent AEConn
+  DEL_USER_ :: ACommandTag Agent AENone
+  CHK_ :: ACommandTag Client AEConn
+  STAT_ :: ACommandTag Agent AEConn
+  OK_ :: ACommandTag Agent AEConn
+  ERR_ :: ACommandTag Agent AEConn
+  SUSPENDED_ :: ACommandTag Agent AENone
+  -- XFTP commands and responses
+  RFDONE_ :: ACommandTag Agent AERcvFile
+  RFPROG_ :: ACommandTag Agent AERcvFile
+  RFERR_ :: ACommandTag Agent AERcvFile
+  SFPROG_ :: ACommandTag Agent AESndFile
+  SFDONE_ :: ACommandTag Agent AESndFile
+  SFERR_ :: ACommandTag Agent AESndFile
+
+deriving instance Eq (ACommandTag p e)
+
+deriving instance Show (ACommandTag p e)
+
+aPartyCmdTag :: APartyCmd p -> APartyCmdTag p
+aPartyCmdTag (APC e cmd) = APCT e $ aCommandTag cmd
+
+aCommandTag :: ACommand p e -> ACommandTag p e
 aCommandTag = \case
   NEW {} -> NEW_
   INV _ -> INV_
@@ -349,11 +442,20 @@ aCommandTag = \case
   SWCH -> SWCH_
   OFF -> OFF_
   DEL -> DEL_
+  DEL_RCVQ {} -> DEL_RCVQ_
+  DEL_CONN -> DEL_CONN_
+  DEL_USER _ -> DEL_USER_
   CHK -> CHK_
   STAT _ -> STAT_
   OK -> OK_
   ERR _ -> ERR_
   SUSPENDED -> SUSPENDED_
+  RFPROG {} -> RFPROG_
+  RFDONE {} -> RFDONE_
+  RFERR {} -> RFERR_
+  SFPROG {} -> SFPROG_
+  SFDONE {} -> SFDONE_
+  SFERR {} -> SFERR_
 
 data QueueDirection = QDRcv | QDSnd
   deriving (Eq, Show)
@@ -375,18 +477,20 @@ instance ToJSON QueueDirection where
 instance FromJSON QueueDirection where
   parseJSON = strParseJSON "QueueDirection"
 
-data SwitchPhase = SPStarted | SPConfirmed | SPCompleted
+data SwitchPhase = SPStarted | SPConfirmed | SPSecured | SPCompleted
   deriving (Eq, Show)
 
 instance StrEncoding SwitchPhase where
   strEncode = \case
     SPStarted -> "started"
     SPConfirmed -> "confirmed"
+    SPSecured -> "secured"
     SPCompleted -> "completed"
   strP =
     A.takeTill (== ' ') >>= \case
       "started" -> pure SPStarted
       "confirmed" -> pure SPConfirmed
+      "secured" -> pure SPSecured
       "completed" -> pure SPCompleted
       _ -> fail "bad SwitchPhase"
 
@@ -397,19 +501,113 @@ instance ToJSON SwitchPhase where
 instance FromJSON SwitchPhase where
   parseJSON = strParseJSON "SwitchPhase"
 
+data RcvSwitchStatus
+  = RSSwitchStarted
+  | RSSendingQADD
+  | RSSendingQUSE
+  | RSReceivedMessage
+  deriving (Eq, Show)
+
+instance StrEncoding RcvSwitchStatus where
+  strEncode = \case
+    RSSwitchStarted -> "switch_started"
+    RSSendingQADD -> "sending_qadd"
+    RSSendingQUSE -> "sending_quse"
+    RSReceivedMessage -> "received_message"
+  strP =
+    A.takeTill (== ' ') >>= \case
+      "switch_started" -> pure RSSwitchStarted
+      "sending_qadd" -> pure RSSendingQADD
+      "sending_quse" -> pure RSSendingQUSE
+      "received_message" -> pure RSReceivedMessage
+      _ -> fail "bad RcvSwitchStatus"
+
+instance ToField RcvSwitchStatus where toField = toField . decodeLatin1 . strEncode
+
+instance FromField RcvSwitchStatus where fromField = fromTextField_ $ eitherToMaybe . strDecode . encodeUtf8
+
+instance ToJSON RcvSwitchStatus where
+  toEncoding = strToJEncoding
+  toJSON = strToJSON
+
+instance FromJSON RcvSwitchStatus where
+  parseJSON = strParseJSON "RcvSwitchStatus"
+
+data SndSwitchStatus
+  = SSSendingQKEY
+  | SSSendingQTEST
+  deriving (Eq, Show)
+
+instance StrEncoding SndSwitchStatus where
+  strEncode = \case
+    SSSendingQKEY -> "sending_qkey"
+    SSSendingQTEST -> "sending_qtest"
+  strP =
+    A.takeTill (== ' ') >>= \case
+      "sending_qkey" -> pure SSSendingQKEY
+      "sending_qtest" -> pure SSSendingQTEST
+      _ -> fail "bad SndSwitchStatus"
+
+instance ToField SndSwitchStatus where toField = toField . decodeLatin1 . strEncode
+
+instance FromField SndSwitchStatus where fromField = fromTextField_ $ eitherToMaybe . strDecode . encodeUtf8
+
+instance ToJSON SndSwitchStatus where
+  toEncoding = strToJEncoding
+  toJSON = strToJSON
+
+instance FromJSON SndSwitchStatus where
+  parseJSON = strParseJSON "SndSwitchStatus"
+
+data RcvQueueInfo = RcvQueueInfo
+  { rcvServer :: SMPServer,
+    rcvSwitchStatus :: Maybe RcvSwitchStatus,
+    canAbortSwitch :: Bool
+  }
+  deriving (Eq, Show, Generic)
+
+instance ToJSON RcvQueueInfo where toEncoding = J.genericToEncoding J.defaultOptions {J.omitNothingFields = True}
+
+instance StrEncoding RcvQueueInfo where
+  strEncode RcvQueueInfo {rcvServer, rcvSwitchStatus, canAbortSwitch} =
+    "srv=" <> strEncode rcvServer
+      <> maybe "" (\switch -> ";switch=" <> strEncode switch) rcvSwitchStatus
+      <> (";can_abort_switch=" <> strEncode canAbortSwitch)
+  strP = do
+    rcvServer <- "srv=" *> strP
+    rcvSwitchStatus <- optional $ ";switch=" *> strP
+    canAbortSwitch <- ";can_abort_switch=" *> strP
+    pure RcvQueueInfo {rcvServer, rcvSwitchStatus, canAbortSwitch}
+
+data SndQueueInfo = SndQueueInfo
+  { sndServer :: SMPServer,
+    sndSwitchStatus :: Maybe SndSwitchStatus
+  }
+  deriving (Eq, Show, Generic)
+
+instance ToJSON SndQueueInfo where toEncoding = J.genericToEncoding J.defaultOptions {J.omitNothingFields = True}
+
+instance StrEncoding SndQueueInfo where
+  strEncode SndQueueInfo {sndServer, sndSwitchStatus} =
+    "srv=" <> strEncode sndServer <> maybe "" (\switch -> ";switch=" <> strEncode switch) sndSwitchStatus
+  strP = do
+    sndServer <- "srv=" *> strP
+    sndSwitchStatus <- optional $ ";switch=" *> strP
+    pure SndQueueInfo {sndServer, sndSwitchStatus}
+
 data ConnectionStats = ConnectionStats
-  { rcvServers :: [SMPServer],
-    sndServers :: [SMPServer]
+  { rcvQueuesInfo :: [RcvQueueInfo],
+    sndQueuesInfo :: [SndQueueInfo]
   }
   deriving (Eq, Show, Generic)
 
 instance StrEncoding ConnectionStats where
-  strEncode ConnectionStats {rcvServers, sndServers} =
-    "rcv=" <> strEncodeList rcvServers <> " snd=" <> strEncodeList sndServers
+  strEncode ConnectionStats {rcvQueuesInfo, sndQueuesInfo} =
+    "rcv=" <> strEncodeList rcvQueuesInfo <> " snd=" <> strEncodeList sndQueuesInfo
   strP = do
-    rcvServers <- "rcv=" *> strListP
-    sndServers <- " snd=" *> strListP
-    pure ConnectionStats {rcvServers, sndServers}
+    rcvQueuesInfo <- "rcv=" *> strListP
+    sndQueuesInfo <- " snd=" *> strListP
+    pure ConnectionStats {rcvQueuesInfo, sndQueuesInfo}
 
 instance ToJSON ConnectionStats where toEncoding = J.genericToEncoding J.defaultOptions
 
@@ -802,6 +1000,10 @@ connModeT = \case
 -- | SMP agent connection ID.
 type ConnId = ByteString
 
+type RcvFileId = ByteString
+
+type SndFileId = ByteString
+
 type ConfirmationId = ByteString
 
 type InvitationId = ByteString
@@ -1061,6 +1263,8 @@ data AgentErrorType
     SMP {smpErr :: ErrorType}
   | -- | NTF protocol errors forwarded to agent clients
     NTF {ntfErr :: ErrorType}
+  | -- | XFTP protocol errors forwarded to agent clients
+    XFTP {xftpErr :: XFTPErrorType}
   | -- | SMP server errors
     BROKER {brokerAddress :: String, brokerErr :: BrokerErrorType}
   | -- | errors of other agents
@@ -1112,7 +1316,7 @@ instance ToJSON ConnectionErrorType where
 -- | SMP server errors.
 data BrokerErrorType
   = -- | invalid server response (failed to parse)
-    RESPONSE {smpErr :: ErrorType}
+    RESPONSE {smpErr :: String}
   | -- | unexpected response
     UNEXPECTED
   | -- | network error
@@ -1138,13 +1342,31 @@ data SMPAgentError
   | -- | incompatible version of SMP client, agent or encryption protocols
     A_VERSION
   | -- | cannot decrypt message
-    A_ENCRYPTION
+    A_CRYPTO {cryptoErr :: AgentCryptoError}
   | -- | duplicate message - this error is detected by ratchet decryption - this message will be ignored and not shown
+    -- it may also indicate a loss of ratchet synchronization (when only one message is sent via copied ratchet)
     A_DUPLICATE
   | -- | error in the message to add/delete/etc queue in connection
     A_QUEUE {queueErr :: String}
   deriving (Eq, Generic, Read, Show, Exception)
 
+data AgentCryptoError
+  = -- | AES decryption error
+    DECRYPT_AES
+  | -- CryptoBox decryption error
+    DECRYPT_CB
+  | -- | can't decrypt ratchet header, possibly ratchet out of sync due to device change
+    RATCHET_HEADER
+  | -- | earlier message number (or, possibly, skipped message that failed to decrypt?)
+    RATCHET_EARLIER Word32
+  | -- | too many skipped messages
+    RATCHET_SKIPPED Word32
+  deriving (Eq, Generic, Read, Show, Exception)
+
+instance ToJSON AgentCryptoError where
+  toJSON = J.genericToJSON $ sumTypeJSON id
+  toEncoding = J.genericToEncoding $ sumTypeJSON id
+
 instance ToJSON SMPAgentError where
   toJSON = J.genericToJSON $ sumTypeJSON id
   toEncoding = J.genericToEncoding $ sumTypeJSON id
@@ -1155,27 +1377,31 @@ instance StrEncoding AgentErrorType where
       <|> "CONN " *> (CONN <$> parseRead1)
       <|> "SMP " *> (SMP <$> strP)
       <|> "NTF " *> (NTF <$> strP)
-      <|> "BROKER " *> (BROKER <$> srvP <* " RESPONSE " <*> (RESPONSE <$> strP))
-      <|> "BROKER " *> (BROKER <$> srvP <* " TRANSPORT " <*> (TRANSPORT <$> transportErrorP))
-      <|> "BROKER " *> (BROKER <$> srvP <* A.space <*> parseRead1)
+      <|> "XFTP " *> (XFTP <$> strP)
+      <|> "BROKER " *> (BROKER <$> textP <* " RESPONSE " <*> (RESPONSE <$> textP))
+      <|> "BROKER " *> (BROKER <$> textP <* " TRANSPORT " <*> (TRANSPORT <$> transportErrorP))
+      <|> "BROKER " *> (BROKER <$> textP <* A.space <*> parseRead1)
+      <|> "AGENT CRYPTO " *> (AGENT . A_CRYPTO <$> parseRead A.takeByteString)
       <|> "AGENT QUEUE " *> (AGENT . A_QUEUE <$> parseRead A.takeByteString)
       <|> "AGENT " *> (AGENT <$> parseRead1)
       <|> "INTERNAL " *> (INTERNAL <$> parseRead A.takeByteString)
     where
-      srvP = T.unpack . safeDecodeUtf8 <$> A.takeTill (== ' ')
+      textP = T.unpack . safeDecodeUtf8 <$> A.takeTill (== ' ')
   strEncode = \case
     CMD e -> "CMD " <> bshow e
     CONN e -> "CONN " <> bshow e
     SMP e -> "SMP " <> strEncode e
     NTF e -> "NTF " <> strEncode e
-    BROKER srv (RESPONSE e) -> "BROKER " <> addr srv <> " RESPONSE " <> strEncode e
-    BROKER srv (TRANSPORT e) -> "BROKER " <> addr srv <> " TRANSPORT " <> serializeTransportError e
-    BROKER srv e -> "BROKER " <> addr srv <> " " <> bshow e
+    XFTP e -> "XFTP " <> strEncode e
+    BROKER srv (RESPONSE e) -> "BROKER " <> text srv <> " RESPONSE " <> text e
+    BROKER srv (TRANSPORT e) -> "BROKER " <> text srv <> " TRANSPORT " <> serializeTransportError e
+    BROKER srv e -> "BROKER " <> text srv <> " " <> bshow e
+    AGENT (A_CRYPTO e) -> "AGENT CRYPTO " <> bshow e
     AGENT (A_QUEUE e) -> "AGENT QUEUE " <> bshow e
     AGENT e -> "AGENT " <> bshow e
     INTERNAL e -> "INTERNAL " <> bshow e
     where
-      addr = encodeUtf8 . T.pack
+      text = encodeUtf8 . T.pack
 
 instance Arbitrary AgentErrorType where arbitrary = genericArbitraryU
 
@@ -1187,6 +1413,8 @@ instance Arbitrary BrokerErrorType where arbitrary = genericArbitraryU
 
 instance Arbitrary SMPAgentError where arbitrary = genericArbitraryU
 
+instance Arbitrary AgentCryptoError where arbitrary = genericArbitraryU
+
 -- | SMP agent command and response parser for commands passed via network (only parses binary length)
 networkCommandP :: Parser ACmd
 networkCommandP = commandP A.takeByteString
@@ -1196,43 +1424,61 @@ dbCommandP :: Parser ACmd
 dbCommandP = commandP $ A.take =<< (A.decimal <* "\n")
 
 instance StrEncoding ACmdTag where
-  strEncode (ACmdTag _ cmd) = strEncode cmd
+  strEncode (ACmdTag _ _ cmd) = strEncode cmd
   strP =
     A.takeTill (== ' ') >>= \case
-      "NEW" -> pure $ ACmdTag SClient NEW_
-      "INV" -> pure $ ACmdTag SAgent INV_
-      "JOIN" -> pure $ ACmdTag SClient JOIN_
-      "CONF" -> pure $ ACmdTag SAgent CONF_
-      "LET" -> pure $ ACmdTag SClient LET_
-      "REQ" -> pure $ ACmdTag SAgent REQ_
-      "ACPT" -> pure $ ACmdTag SClient ACPT_
-      "RJCT" -> pure $ ACmdTag SClient RJCT_
-      "INFO" -> pure $ ACmdTag SAgent INFO_
-      "CON" -> pure $ ACmdTag SAgent CON_
-      "SUB" -> pure $ ACmdTag SClient SUB_
-      "END" -> pure $ ACmdTag SAgent END_
-      "CONNECT" -> pure $ ACmdTag SAgent CONNECT_
-      "DISCONNECT" -> pure $ ACmdTag SAgent DISCONNECT_
-      "DOWN" -> pure $ ACmdTag SAgent DOWN_
-      "UP" -> pure $ ACmdTag SAgent UP_
-      "SWITCH" -> pure $ ACmdTag SAgent SWITCH_
-      "SEND" -> pure $ ACmdTag SClient SEND_
-      "MID" -> pure $ ACmdTag SAgent MID_
-      "SENT" -> pure $ ACmdTag SAgent SENT_
-      "MERR" -> pure $ ACmdTag SAgent MERR_
-      "MSG" -> pure $ ACmdTag SAgent MSG_
-      "ACK" -> pure $ ACmdTag SClient ACK_
-      "SWCH" -> pure $ ACmdTag SClient SWCH_
-      "OFF" -> pure $ ACmdTag SClient OFF_
-      "DEL" -> pure $ ACmdTag SClient DEL_
-      "CHK" -> pure $ ACmdTag SClient CHK_
-      "STAT" -> pure $ ACmdTag SAgent STAT_
-      "OK" -> pure $ ACmdTag SAgent OK_
-      "ERR" -> pure $ ACmdTag SAgent ERR_
-      "SUSPENDED" -> pure $ ACmdTag SAgent SUSPENDED_
+      "NEW" -> t NEW_
+      "INV" -> ct INV_
+      "JOIN" -> t JOIN_
+      "CONF" -> ct CONF_
+      "LET" -> t LET_
+      "REQ" -> ct REQ_
+      "ACPT" -> t ACPT_
+      "RJCT" -> t RJCT_
+      "INFO" -> ct INFO_
+      "CON" -> ct CON_
+      "SUB" -> t SUB_
+      "END" -> ct END_
+      "CONNECT" -> nt CONNECT_
+      "DISCONNECT" -> nt DISCONNECT_
+      "DOWN" -> nt DOWN_
+      "UP" -> nt UP_
+      "SWITCH" -> ct SWITCH_
+      "SEND" -> t SEND_
+      "MID" -> ct MID_
+      "SENT" -> ct SENT_
+      "MERR" -> ct MERR_
+      "MSG" -> ct MSG_
+      "ACK" -> t ACK_
+      "SWCH" -> t SWCH_
+      "OFF" -> t OFF_
+      "DEL" -> t DEL_
+      "DEL_RCVQ" -> ct DEL_RCVQ_
+      "DEL_CONN" -> ct DEL_CONN_
+      "DEL_USER" -> nt DEL_USER_
+      "CHK" -> t CHK_
+      "STAT" -> ct STAT_
+      "OK" -> ct OK_
+      "ERR" -> ct ERR_
+      "SUSPENDED" -> nt SUSPENDED_
+      "RFPROG" -> at SAERcvFile RFPROG_
+      "RFDONE" -> at SAERcvFile RFDONE_
+      "RFERR" -> at SAERcvFile RFERR_
+      "SFPROG" -> at SAESndFile SFPROG_
+      "SFDONE" -> at SAESndFile SFDONE_
+      "SFERR" -> at SAESndFile SFERR_
       _ -> fail "bad ACmdTag"
+    where
+      t = pure . ACmdTag SClient SAEConn
+      at e = pure . ACmdTag SAgent e
+      ct = at SAEConn
+      nt = at SAENone
 
-instance APartyI p => StrEncoding (ACommandTag p) where
+instance APartyI p => StrEncoding (APartyCmdTag p) where
+  strEncode (APCT _ cmd) = strEncode cmd
+  strP = (\(ACmdTag _ e t) -> checkParty $ APCT e t) <$?> strP
+
+instance (APartyI p, AEntityI e) => StrEncoding (ACommandTag p e) where
   strEncode = \case
     NEW_ -> "NEW"
     INV_ -> "INV"
@@ -1260,25 +1506,39 @@ instance APartyI p => StrEncoding (ACommandTag p) where
     SWCH_ -> "SWCH"
     OFF_ -> "OFF"
     DEL_ -> "DEL"
+    DEL_RCVQ_ -> "DEL_RCVQ"
+    DEL_CONN_ -> "DEL_CONN"
+    DEL_USER_ -> "DEL_USER"
     CHK_ -> "CHK"
     STAT_ -> "STAT"
     OK_ -> "OK"
     ERR_ -> "ERR"
     SUSPENDED_ -> "SUSPENDED"
-  strP = (\(ACmdTag _ t) -> checkParty t) <$?> strP
+    RFPROG_ -> "RFPROG"
+    RFDONE_ -> "RFDONE"
+    RFERR_ -> "RFERR"
+    SFPROG_ -> "SFPROG"
+    SFDONE_ -> "SFDONE"
+    SFERR_ -> "SFERR"
+  strP = (\(APCT _ t) -> checkEntity t) <$?> strP
 
 checkParty :: forall t p p'. (APartyI p, APartyI p') => t p' -> Either String (t p)
 checkParty x = case testEquality (sAParty @p) (sAParty @p') of
   Just Refl -> Right x
   Nothing -> Left "bad party"
 
+checkEntity :: forall t e e'. (AEntityI e, AEntityI e') => t e' -> Either String (t e)
+checkEntity x = case testEquality (sAEntity @e) (sAEntity @e') of
+  Just Refl -> Right x
+  Nothing -> Left "bad entity"
+
 -- | SMP agent command and response parser
 commandP :: Parser ByteString -> Parser ACmd
 commandP binaryP =
   strP
     >>= \case
-      ACmdTag SClient cmd ->
-        ACmd SClient <$> case cmd of
+      ACmdTag SClient e cmd ->
+        ACmd SClient e <$> case cmd of
           NEW_ -> s (NEW <$> strP_ <*> strP)
           JOIN_ -> s (JOIN <$> strP_ <*> strP_ <*> binaryP)
           LET_ -> s (LET <$> A.takeTill (== ' ') <* A.space <*> binaryP)
@@ -1291,8 +1551,8 @@ commandP binaryP =
           OFF_ -> pure OFF
           DEL_ -> pure DEL
           CHK_ -> pure CHK
-      ACmdTag SAgent cmd ->
-        ACmd SAgent <$> case cmd of
+      ACmdTag SAgent e cmd ->
+        ACmd SAgent e <$> case cmd of
           INV_ -> s (INV <$> strP)
           CONF_ -> s (CONF <$> A.takeTill (== ' ') <* A.space <*> strListP <* A.space <*> binaryP)
           REQ_ -> s (REQ <$> A.takeTill (== ' ') <* A.space <*> strP_ <*> binaryP)
@@ -1308,15 +1568,30 @@ commandP binaryP =
           SENT_ -> s (SENT <$> A.decimal)
           MERR_ -> s (MERR <$> A.decimal <* A.space <*> strP)
           MSG_ -> s (MSG <$> msgMetaP <* A.space <*> smpP <* A.space <*> binaryP)
+          DEL_RCVQ_ -> s (DEL_RCVQ <$> strP_ <*> strP_ <*> strP)
+          DEL_CONN_ -> pure DEL_CONN
+          DEL_USER_ -> s (DEL_USER <$> strP)
           STAT_ -> s (STAT <$> strP)
           OK_ -> pure OK
           ERR_ -> s (ERR <$> strP)
           SUSPENDED_ -> pure SUSPENDED
+          RFPROG_ -> s (RFPROG <$> A.decimal <* A.space <*> A.decimal)
+          RFDONE_ -> s (RFDONE <$> strP)
+          RFERR_ -> s (RFERR <$> strP)
+          SFPROG_ -> s (SFPROG <$> A.decimal <* A.space <*> A.decimal)
+          SFDONE_ -> s (sfDone . safeDecodeUtf8 <$?> binaryP)
+          SFERR_ -> s (SFERR <$> strP)
   where
     s :: Parser a -> Parser a
     s p = A.space *> p
     connections :: Parser [ConnId]
     connections = strP `A.sepBy'` A.char ','
+    sfDone :: Text -> Either String (ACommand 'Agent 'AESndFile)
+    sfDone t =
+      let ds = T.splitOn fdSeparator t
+       in case ds of
+            [] -> Left "no sender file description"
+            sd : rds -> SFDONE <$> strDecode (encodeUtf8 sd) <*> mapM (strDecode . encodeUtf8) rds
     msgMetaP = do
       integrity <- strP
       recipient <- " R=" *> partyMeta A.decimal
@@ -1329,7 +1604,7 @@ parseCommand :: ByteString -> Either AgentErrorType ACmd
 parseCommand = parse (commandP A.takeByteString) $ CMD SYNTAX
 
 -- | Serialize SMP agent command.
-serializeCommand :: ACommand p -> ByteString
+serializeCommand :: ACommand p e -> ByteString
 serializeCommand = \case
   NEW ntfs cMode -> s (NEW_, ntfs, cMode)
   INV cReq -> s (INV_, cReq)
@@ -1356,12 +1631,21 @@ serializeCommand = \case
   SWCH -> s SWCH_
   OFF -> s OFF_
   DEL -> s DEL_
+  DEL_RCVQ srv rcvId err_ -> s (DEL_RCVQ_, srv, rcvId, err_)
+  DEL_CONN -> s DEL_CONN_
+  DEL_USER userId -> s (DEL_USER_, userId)
   CHK -> s CHK_
   STAT srvs -> s (STAT_, srvs)
   CON -> s CON_
   ERR e -> s (ERR_, e)
   OK -> s OK_
   SUSPENDED -> s SUSPENDED_
+  RFPROG rcvd total -> s (RFPROG_, rcvd, total)
+  RFDONE fPath -> s (RFDONE_, fPath)
+  RFERR e -> s (RFERR_, e)
+  SFPROG sent total -> s (SFPROG_, sent, total)
+  SFDONE sd rds -> B.unwords [s SFDONE_, serializeBinary (sfDone sd rds)]
+  SFERR e -> s (SFERR_, e)
   where
     s :: StrEncoding a => a -> ByteString
     s = strEncode
@@ -1369,6 +1653,7 @@ serializeCommand = \case
     showTs = B.pack . formatISO8601Millis
     connections :: [ConnId] -> ByteString
     connections = B.intercalate "," . map strEncode
+    sfDone sd rds = B.intercalate fdSeparator $ strEncode sd : map strEncode rds
     serializeMsgMeta :: MsgMeta -> ByteString
     serializeMsgMeta MsgMeta {integrity, recipient = (rmId, rTs), broker = (bmId, bTs), sndMsgId} =
       B.unwords
@@ -1394,60 +1679,65 @@ tGetRaw h = (,,) <$> getLn h <*> getLn h <*> getLn h
 
 -- | Send SMP agent protocol command (or response) to TCP connection.
 tPut :: (Transport c, MonadIO m) => c -> ATransmission p -> m ()
-tPut h (corrId, connId, command) =
-  liftIO $ tPutRaw h (corrId, connId, serializeCommand command)
+tPut h (corrId, connId, APC _ cmd) =
+  liftIO $ tPutRaw h (corrId, connId, serializeCommand cmd)
 
 -- | Receive client and agent transmissions from TCP connection.
 tGet :: forall c m p. (Transport c, MonadIO m) => SAParty p -> c -> m (ATransmissionOrError p)
 tGet party h = liftIO (tGetRaw h) >>= tParseLoadBody
   where
     tParseLoadBody :: ARawTransmission -> m (ATransmissionOrError p)
-    tParseLoadBody t@(corrId, connId, command) = do
+    tParseLoadBody t@(corrId, entId, command) = do
       let cmd = parseCommand command >>= fromParty >>= tConnId t
       fullCmd <- either (return . Left) cmdWithMsgBody cmd
-      return (corrId, connId, fullCmd)
+      return (corrId, entId, fullCmd)
 
-    fromParty :: ACmd -> Either AgentErrorType (ACommand p)
-    fromParty (ACmd (p :: p1) cmd) = case testEquality party p of
-      Just Refl -> Right cmd
+    fromParty :: ACmd -> Either AgentErrorType (APartyCmd p)
+    fromParty (ACmd (p :: p1) e cmd) = case testEquality party p of
+      Just Refl -> Right $ APC e cmd
       _ -> Left $ CMD PROHIBITED
 
-    tConnId :: ARawTransmission -> ACommand p -> Either AgentErrorType (ACommand p)
-    tConnId (_, connId, _) cmd = case cmd of
-      -- NEW, JOIN and ACPT have optional connId
-      NEW {} -> Right cmd
-      JOIN {} -> Right cmd
-      ACPT {} -> Right cmd
-      -- ERROR response does not always have connId
-      ERR _ -> Right cmd
-      CONNECT {} -> Right cmd
-      DISCONNECT {} -> Right cmd
-      DOWN {} -> Right cmd
-      UP {} -> Right cmd
-      -- other responses must have connId
-      _
-        | B.null connId -> Left $ CMD NO_CONN
-        | otherwise -> Right cmd
+    tConnId :: ARawTransmission -> APartyCmd p -> Either AgentErrorType (APartyCmd p)
+    tConnId (_, entId, _) (APC e cmd) =
+      APC e <$> case cmd of
+        -- NEW, JOIN and ACPT have optional connection ID
+        NEW {} -> Right cmd
+        JOIN {} -> Right cmd
+        ACPT {} -> Right cmd
+        -- ERROR response does not always have connection ID
+        ERR _ -> Right cmd
+        CONNECT {} -> Right cmd
+        DISCONNECT {} -> Right cmd
+        DOWN {} -> Right cmd
+        UP {} -> Right cmd
+        SUSPENDED {} -> Right cmd
+        -- other responses must have connection ID
+        _
+          | B.null entId -> Left $ CMD NO_CONN
+          | otherwise -> Right cmd
 
-    cmdWithMsgBody :: ACommand p -> m (Either AgentErrorType (ACommand p))
-    cmdWithMsgBody = \case
-      SEND msgFlags body -> SEND msgFlags <$$> getBody body
-      MSG msgMeta msgFlags body -> MSG msgMeta msgFlags <$$> getBody body
-      JOIN ntfs qUri cInfo -> JOIN ntfs qUri <$$> getBody cInfo
-      CONF confId srvs cInfo -> CONF confId srvs <$$> getBody cInfo
-      LET confId cInfo -> LET confId <$$> getBody cInfo
-      REQ invId srvs cInfo -> REQ invId srvs <$$> getBody cInfo
-      ACPT invId cInfo -> ACPT invId <$$> getBody cInfo
-      INFO cInfo -> INFO <$$> getBody cInfo
-      cmd -> pure $ Right cmd
+    cmdWithMsgBody :: APartyCmd p -> m (Either AgentErrorType (APartyCmd p))
+    cmdWithMsgBody (APC e cmd) =
+      APC e <$$> case cmd of
+        SEND msgFlags body -> SEND msgFlags <$$> getBody body
+        MSG msgMeta msgFlags body -> MSG msgMeta msgFlags <$$> getBody body
+        JOIN ntfs qUri cInfo -> JOIN ntfs qUri <$$> getBody cInfo
+        CONF confId srvs cInfo -> CONF confId srvs <$$> getBody cInfo
+        LET confId cInfo -> LET confId <$$> getBody cInfo
+        REQ invId srvs cInfo -> REQ invId srvs <$$> getBody cInfo
+        ACPT invId cInfo -> ACPT invId <$$> getBody cInfo
+        INFO cInfo -> INFO <$$> getBody cInfo
+        _ -> pure $ Right cmd
 
     getBody :: ByteString -> m (Either AgentErrorType ByteString)
     getBody binary =
       case B.unpack binary of
         ':' : body -> return . Right $ B.pack body
         str -> case readMaybe str :: Maybe Int of
-          Just size -> liftIO $ do
-            body <- cGet h size
-            s <- getLn h
-            return $ if B.null s then Right body else Left $ CMD SIZE
+          Just size -> runExceptT $ do
+            body <- liftIO $ cGet h size
+            unless (B.length body == size) $ throwError $ CMD SIZE
+            s <- liftIO $ getLn h
+            unless (B.null s) $ throwError $ CMD SIZE
+            pure body
           Nothing -> return . Left $ CMD SYNTAX

src/Simplex/Messaging/Agent/RetryInterval.hs

@@ -1,26 +1,30 @@
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 
 module Simplex.Messaging.Agent.RetryInterval
   ( RetryInterval (..),
     RetryInterval2 (..),
     RetryIntervalMode (..),
+    RI2State (..),
     withRetryInterval,
     withRetryLock2,
+    updateRetryInterval2,
   )
 where
 
-import Control.Concurrent (forkIO, threadDelay)
+import Control.Concurrent (forkIO)
 import Control.Monad (void)
 import Control.Monad.IO.Class (MonadIO, liftIO)
-import Simplex.Messaging.Util (whenM)
+import Data.Int (Int64)
+import Simplex.Messaging.Util (threadDelay', whenM)
 import UnliftIO.STM
 
 data RetryInterval = RetryInterval
-  { initialInterval :: Int,
-    increaseAfter :: Int,
-    maxInterval :: Int
+  { initialInterval :: Int64,
+    increaseAfter :: Int64,
+    maxInterval :: Int64
   }
 
 data RetryInterval2 = RetryInterval2
@@ -28,27 +32,40 @@ data RetryInterval2 = RetryInterval2
     riFast :: RetryInterval
   }
 
-data RetryIntervalMode = RISlow | RIFast
-  deriving (Eq)
+data RI2State = RI2State
+  { slowInterval :: Int64,
+    fastInterval :: Int64
+  }
+  deriving (Show)
 
-withRetryInterval :: forall m. MonadIO m => RetryInterval -> (m () -> m ()) -> m ()
+updateRetryInterval2 :: RI2State -> RetryInterval2 -> RetryInterval2
+updateRetryInterval2 RI2State {slowInterval, fastInterval} RetryInterval2 {riSlow, riFast} =
+  RetryInterval2
+    { riSlow = riSlow {initialInterval = slowInterval, increaseAfter = 0},
+      riFast = riFast {initialInterval = fastInterval, increaseAfter = 0}
+    }
+
+data RetryIntervalMode = RISlow | RIFast
+  deriving (Eq, Show)
+
+withRetryInterval :: forall m a. MonadIO m => RetryInterval -> (Int64 -> m a -> m a) -> m a
 withRetryInterval ri action = callAction 0 $ initialInterval ri
   where
-    callAction :: Int -> Int -> m ()
-    callAction elapsed delay = action loop
+    callAction :: Int64 -> Int64 -> m a
+    callAction elapsed delay = action delay loop
       where
         loop = do
-          liftIO $ threadDelay delay
+          liftIO $ threadDelay' delay
           let elapsed' = elapsed + delay
           callAction elapsed' $ nextDelay elapsed' delay ri
 
 -- This function allows action to toggle between slow and fast retry intervals.
-withRetryLock2 :: forall m. MonadIO m => RetryInterval2 -> TMVar () -> ((RetryIntervalMode -> m ()) -> m ()) -> m ()
+withRetryLock2 :: forall m. MonadIO m => RetryInterval2 -> TMVar () -> (RI2State -> (RetryIntervalMode -> m ()) -> m ()) -> m ()
 withRetryLock2 RetryInterval2 {riSlow, riFast} lock action =
   callAction (0, initialInterval riSlow) (0, initialInterval riFast)
   where
-    callAction :: (Int, Int) -> (Int, Int) -> m ()
-    callAction slow fast = action loop
+    callAction :: (Int64, Int64) -> (Int64, Int64) -> m ()
+    callAction slow fast = action (RI2State (snd slow) (snd fast)) loop
       where
         loop = \case
           RISlow -> run slow riSlow (`callAction` fast)
@@ -56,17 +73,18 @@ withRetryLock2 RetryInterval2 {riSlow, riFast} lock action =
         run (elapsed, delay) ri call = do
           wait delay
           let elapsed' = elapsed + delay
-          call (elapsed', nextDelay elapsed' delay ri)
+              delay' = nextDelay elapsed' delay ri
+          call (elapsed', delay')
         wait delay = do
           waiting <- newTVarIO True
           _ <- liftIO . forkIO $ do
-            threadDelay delay
+            threadDelay' delay
             atomically $ whenM (readTVar waiting) $ void $ tryPutTMVar lock ()
           atomically $ do
             takeTMVar lock
             writeTVar waiting False
 
-nextDelay :: Int -> Int -> RetryInterval -> Int
+nextDelay :: Int64 -> Int64 -> RetryInterval -> Int64
 nextDelay elapsed delay RetryInterval {increaseAfter, maxInterval} =
   if elapsed < increaseAfter || delay == maxInterval
     then delay

src/Simplex/Messaging/Agent/Server.hs

@@ -21,6 +21,7 @@ import Data.Text.Encoding (decodeUtf8)
 import Simplex.Messaging.Agent
 import Simplex.Messaging.Agent.Env.SQLite
 import Simplex.Messaging.Agent.Protocol
+import Simplex.Messaging.Agent.Store.SQLite (SQLiteStore)
 import Simplex.Messaging.Transport (ATransport (..), TProxy, Transport (..), simplexMQVersion)
 import Simplex.Messaging.Transport.Server (loadTLSServerParams, runTransportServer)
 import Simplex.Messaging.Util (bshow)
@@ -31,18 +32,17 @@ import UnliftIO.STM
 -- | Runs an SMP agent as a TCP service using passed configuration.
 --
 -- See a full agent executable here: https://github.com/simplex-chat/simplexmq/blob/master/apps/smp-agent/Main.hs
-runSMPAgent :: (MonadRandom m, MonadUnliftIO m) => ATransport -> AgentConfig -> InitialAgentServers -> m ()
-runSMPAgent t cfg initServers = do
-  started <- newEmptyTMVarIO
-  runSMPAgentBlocking t started cfg initServers
+runSMPAgent :: (MonadRandom m, MonadUnliftIO m) => ATransport -> AgentConfig -> InitialAgentServers -> SQLiteStore -> m ()
+runSMPAgent t cfg initServers store =
+  runSMPAgentBlocking t cfg initServers store =<< newEmptyTMVarIO
 
 -- | Runs an SMP agent as a TCP service using passed configuration with signalling.
 --
 -- This function uses passed TMVar to signal when the server is ready to accept TCP requests (True)
 -- and when it is disconnected from the TCP socket once the server thread is killed (False).
-runSMPAgentBlocking :: (MonadRandom m, MonadUnliftIO m) => ATransport -> TMVar Bool -> AgentConfig -> InitialAgentServers -> m ()
-runSMPAgentBlocking (ATransport t) started cfg@AgentConfig {tcpPort, caCertificateFile, certificateFile, privateKeyFile} initServers = do
-  runReaderT (smpAgent t) =<< newSMPAgentEnv cfg
+runSMPAgentBlocking :: (MonadRandom m, MonadUnliftIO m) => ATransport -> AgentConfig -> InitialAgentServers -> SQLiteStore -> TMVar Bool -> m ()
+runSMPAgentBlocking (ATransport t) cfg@AgentConfig {tcpPort, caCertificateFile, certificateFile, privateKeyFile} initServers store started = do
+  liftIO (newSMPAgentEnv cfg store) >>= runReaderT (smpAgent t)
   where
     smpAgent :: forall c m'. (Transport c, MonadUnliftIO m', MonadReader Env m') => TProxy c -> m' ()
     smpAgent _ = do
@@ -60,10 +60,10 @@ connectClient h c = race_ (send h c) (receive h c)
 
 receive :: forall c m. (Transport c, MonadUnliftIO m) => c -> AgentClient -> m ()
 receive h c@AgentClient {rcvQ, subQ} = forever $ do
-  (corrId, connId, cmdOrErr) <- tGet SClient h
+  (corrId, entId, cmdOrErr) <- tGet SClient h
   case cmdOrErr of
-    Right cmd -> write rcvQ (corrId, connId, cmd)
-    Left e -> write subQ (corrId, connId, ERR e)
+    Right cmd -> write rcvQ (corrId, entId, cmd)
+    Left e -> write subQ (corrId, entId, APC SAEConn $ ERR e)
   where
     write :: TBQueue (ATransmission p) -> ATransmission p -> m ()
     write q t = do
@@ -77,5 +77,5 @@ send h c@AgentClient {subQ} = forever $ do
   logClient c "<--" t
 
 logClient :: MonadUnliftIO m => AgentClient -> ByteString -> ATransmission a -> m ()
-logClient AgentClient {clientId} dir (corrId, connId, cmd) = do
+logClient AgentClient {clientId} dir (corrId, connId, APC _ cmd) = do
   logInfo . decodeUtf8 $ B.unwords [bshow clientId, dir, "A :", corrId, connId, B.takeWhile (/= ' ') $ serializeCommand cmd]

src/Simplex/Messaging/Agent/Store.hs

@@ -21,9 +21,11 @@ import Data.Kind (Type)
 import Data.List (find)
 import Data.List.NonEmpty (NonEmpty)
 import qualified Data.List.NonEmpty as L
+import Data.Maybe (isJust)
 import Data.Time (UTCTime)
 import Data.Type.Equality
 import Simplex.Messaging.Agent.Protocol
+import Simplex.Messaging.Agent.RetryInterval (RI2State)
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Crypto.Ratchet (RatchetX448)
 import Simplex.Messaging.Encoding.String
@@ -34,6 +36,7 @@ import Simplex.Messaging.Protocol
     NotifierId,
     NtfPrivateSignKey,
     NtfPublicVerifyKey,
+    QueueId,
     RcvDhSecret,
     RcvNtfDhSecret,
     RcvPrivateSignKey,
@@ -47,7 +50,8 @@ import Simplex.Messaging.Version
 
 -- | A receive queue. SMP queue through which the agent receives messages from a sender.
 data RcvQueue = RcvQueue
-  { connId :: ConnId,
+  { userId :: UserId,
+    connId :: ConnId,
     server :: SMPServer,
     -- | recipient queue ID
     rcvId :: SMP.RecipientId,
@@ -63,19 +67,37 @@ data RcvQueue = RcvQueue
     sndId :: SMP.SenderId,
     -- | queue status
     status :: QueueStatus,
-    -- | database queue ID (within connection), can be Nothing for old queues
+    -- | database queue ID (within connection)
     dbQueueId :: Int64,
     -- | True for a primary or a next primary queue of the connection (next if dbReplaceQueueId is set)
     primary :: Bool,
     -- | database queue ID to replace, Nothing if this queue is not replacing another, `Just Nothing` is used for replacing old queues
     dbReplaceQueueId :: Maybe Int64,
+    rcvSwchStatus :: Maybe RcvSwitchStatus,
     -- | SMP client version
     smpClientVersion :: Version,
     -- | credentials used in context of notifications
-    clientNtfCreds :: Maybe ClientNtfCreds
+    clientNtfCreds :: Maybe ClientNtfCreds,
+    deleteErrors :: Int
   }
   deriving (Eq, Show)
 
+rcvQueueInfo :: RcvQueue -> RcvQueueInfo
+rcvQueueInfo rq@RcvQueue {server, rcvSwchStatus} =
+  RcvQueueInfo {rcvServer = server, rcvSwitchStatus = rcvSwchStatus, canAbortSwitch = canAbortRcvSwitch rq}
+
+canAbortRcvSwitch :: RcvQueue -> Bool
+canAbortRcvSwitch = maybe False canAbort . rcvSwchStatus
+  where
+    canAbort = \case
+      RSSwitchStarted -> True
+      RSSendingQADD -> True
+      -- if switch is in RSSendingQUSE, a race condition with sender deleting the original queue is possible
+      RSSendingQUSE -> False
+      -- if switch is in RSReceivedMessage status, aborting switch (deleting new queue)
+      -- will break the connection because the sender would have original queue deleted
+      RSReceivedMessage -> False
+
 data ClientNtfCreds = ClientNtfCreds
   { -- | key pair to be used by the notification server to sign transmissions
     ntfPublicKey :: NtfPublicVerifyKey,
@@ -89,7 +111,8 @@ data ClientNtfCreds = ClientNtfCreds
 
 -- | A send queue. SMP queue through which the agent sends messages to a recipient.
 data SndQueue = SndQueue
-  { connId :: ConnId,
+  { userId :: UserId,
+    connId :: ConnId,
     server :: SMPServer,
     -- | sender queue ID
     sndId :: SMP.SenderId,
@@ -102,17 +125,22 @@ data SndQueue = SndQueue
     e2eDhSecret :: C.DhSecretX25519,
     -- | queue status
     status :: QueueStatus,
-    -- | database queue ID (within connection), can be Nothing for old queues
+    -- | database queue ID (within connection)
     dbQueueId :: Int64,
     -- | True for a primary or a next primary queue of the connection (next if dbReplaceQueueId is set)
     primary :: Bool,
     -- | ID of the queue this one is replacing
     dbReplaceQueueId :: Maybe Int64,
+    sndSwchStatus :: Maybe SndSwitchStatus,
     -- | SMP client version
     smpClientVersion :: Version
   }
   deriving (Eq, Show)
 
+sndQueueInfo :: SndQueue -> SndQueueInfo
+sndQueueInfo SndQueue {server, sndSwchStatus} =
+  SndQueueInfo {sndServer = server, sndSwitchStatus = sndSwchStatus}
+
 instance SMPQueue RcvQueue where
   qServer RcvQueue {server} = server
   {-# INLINE qServer #-}
@@ -150,6 +178,45 @@ findRQ :: (SMPServer, SMP.SenderId) -> NonEmpty RcvQueue -> Maybe RcvQueue
 findRQ sAddr = find $ sameQAddress sAddr . sndAddress
 {-# INLINE findRQ #-}
 
+switchingRQ :: NonEmpty RcvQueue -> Maybe RcvQueue
+switchingRQ = find $ isJust . rcvSwchStatus
+{-# INLINE switchingRQ #-}
+
+updatedQs :: SMPQueueRec q => q -> NonEmpty q -> NonEmpty q
+updatedQs q = L.map $ \q' -> if dbQId q == dbQId q' then q else q'
+{-# INLINE updatedQs #-}
+
+class SMPQueue q => SMPQueueRec q where
+  qUserId :: q -> UserId
+  qConnId :: q -> ConnId
+  queueId :: q -> QueueId
+  dbQId :: q -> Int64
+  dbReplaceQId :: q -> Maybe Int64
+
+instance SMPQueueRec RcvQueue where
+  qUserId = userId
+  {-# INLINE qUserId #-}
+  qConnId = connId
+  {-# INLINE qConnId #-}
+  queueId = rcvId
+  {-# INLINE queueId #-}
+  dbQId = dbQueueId
+  {-# INLINE dbQId #-}
+  dbReplaceQId = dbReplaceQueueId
+  {-# INLINE dbReplaceQId #-}
+
+instance SMPQueueRec SndQueue where
+  qUserId = userId
+  {-# INLINE qUserId #-}
+  qConnId = connId
+  {-# INLINE qConnId #-}
+  queueId = sndId
+  {-# INLINE queueId #-}
+  dbQId = dbQueueId
+  {-# INLINE dbQId #-}
+  dbReplaceQId = dbReplaceQueueId
+  {-# INLINE dbReplaceQId #-}
+
 -- * Connection types
 
 -- | Type of a connection.
@@ -222,6 +289,7 @@ deriving instance Show SomeConn
 
 data ConnData = ConnData
   { connId :: ConnId,
+    userId :: UserId,
     connAgentVersion :: Version,
     enableNtfs :: Bool,
     duplexHandshake :: Maybe Bool, -- added in agent protocol v2
@@ -229,6 +297,13 @@ data ConnData = ConnData
   }
   deriving (Eq, Show)
 
+data PendingCommand = PendingCommand
+  { corrId :: ACorrId,
+    userId :: UserId,
+    connId :: ConnId,
+    command :: AgentCommand
+  }
+
 data AgentCmdType = ACClient | ACInternal
 
 instance StrEncoding AgentCmdType where
@@ -242,20 +317,20 @@ instance StrEncoding AgentCmdType where
       _ -> fail "bad AgentCmdType"
 
 data AgentCommand
-  = AClientCommand (ACommand 'Client)
+  = AClientCommand (APartyCmd 'Client)
   | AInternalCommand InternalCommand
 
 instance StrEncoding AgentCommand where
   strEncode = \case
-    AClientCommand cmd -> strEncode (ACClient, Str $ serializeCommand cmd)
+    AClientCommand (APC _ cmd) -> strEncode (ACClient, Str $ serializeCommand cmd)
     AInternalCommand cmd -> strEncode (ACInternal, cmd)
   strP =
     strP_ >>= \case
-      ACClient -> AClientCommand <$> ((\(ACmd _ cmd) -> checkParty cmd) <$?> dbCommandP)
+      ACClient -> AClientCommand <$> ((\(ACmd _ e cmd) -> checkParty $ APC e cmd) <$?> dbCommandP)
       ACInternal -> AInternalCommand <$> strP
 
 data AgentCommandTag
-  = AClientCommandTag (ACommandTag 'Client)
+  = AClientCommandTag (APartyCmdTag 'Client)
   | AInternalCommandTag InternalCommandTag
   deriving (Show)
 
@@ -274,6 +349,7 @@ data InternalCommand
   | ICAllowSecure SMP.RecipientId SMP.SndPublicVerifyKey
   | ICDuplexSecure SMP.RecipientId SMP.SndPublicVerifyKey
   | ICDeleteConn
+  | ICDeleteRcvQueue SMP.RecipientId
   | ICQSecure SMP.RecipientId SMP.SndPublicVerifyKey
   | ICQDelete SMP.RecipientId
 
@@ -283,6 +359,7 @@ data InternalCommandTag
   | ICAllowSecure_
   | ICDuplexSecure_
   | ICDeleteConn_
+  | ICDeleteRcvQueue_
   | ICQSecure_
   | ICQDelete_
   deriving (Show)
@@ -294,6 +371,7 @@ instance StrEncoding InternalCommand where
     ICAllowSecure rId sndKey -> strEncode (ICAllowSecure_, rId, sndKey)
     ICDuplexSecure rId sndKey -> strEncode (ICDuplexSecure_, rId, sndKey)
     ICDeleteConn -> strEncode ICDeleteConn_
+    ICDeleteRcvQueue rId -> strEncode (ICDeleteRcvQueue_, rId)
     ICQSecure rId senderKey -> strEncode (ICQSecure_, rId, senderKey)
     ICQDelete rId -> strEncode (ICQDelete_, rId)
   strP =
@@ -303,6 +381,7 @@ instance StrEncoding InternalCommand where
       ICAllowSecure_ -> ICAllowSecure <$> _strP <*> _strP
       ICDuplexSecure_ -> ICDuplexSecure <$> _strP <*> _strP
       ICDeleteConn_ -> pure ICDeleteConn
+      ICDeleteRcvQueue_ -> ICDeleteRcvQueue <$> _strP
       ICQSecure_ -> ICQSecure <$> _strP <*> _strP
       ICQDelete_ -> ICQDelete <$> _strP
 
@@ -313,6 +392,7 @@ instance StrEncoding InternalCommandTag where
     ICAllowSecure_ -> "ALLOW_SECURE"
     ICDuplexSecure_ -> "DUPLEX_SECURE"
     ICDeleteConn_ -> "DELETE_CONN"
+    ICDeleteRcvQueue_ -> "DELETE_RCV_QUEUE"
     ICQSecure_ -> "QSECURE"
     ICQDelete_ -> "QDELETE"
   strP =
@@ -322,13 +402,14 @@ instance StrEncoding InternalCommandTag where
       "ALLOW_SECURE" -> pure ICAllowSecure_
       "DUPLEX_SECURE" -> pure ICDuplexSecure_
       "DELETE_CONN" -> pure ICDeleteConn_
+      "DELETE_RCV_QUEUE" -> pure ICDeleteRcvQueue_
       "QSECURE" -> pure ICQSecure_
       "QDELETE" -> pure ICQDelete_
       _ -> fail "bad InternalCommandTag"
 
 agentCommandTag :: AgentCommand -> AgentCommandTag
 agentCommandTag = \case
-  AClientCommand cmd -> AClientCommandTag $ aCommandTag cmd
+  AClientCommand cmd -> AClientCommandTag $ aPartyCmdTag cmd
   AInternalCommand cmd -> AInternalCommandTag $ internalCmdTag cmd
 
 internalCmdTag :: InternalCommand -> InternalCommandTag
@@ -338,6 +419,7 @@ internalCmdTag = \case
   ICAllowSecure {} -> ICAllowSecure_
   ICDuplexSecure {} -> ICDuplexSecure_
   ICDeleteConn -> ICDeleteConn_
+  ICDeleteRcvQueue {} -> ICDeleteRcvQueue_
   ICQSecure {} -> ICQSecure_
   ICQDelete _ -> ICQDelete_
 
@@ -394,7 +476,8 @@ data RcvMsgData = RcvMsgData
     msgBody :: MsgBody,
     internalRcvId :: InternalRcvId,
     internalHash :: MsgHash,
-    externalPrevSndHash :: MsgHash
+    externalPrevSndHash :: MsgHash,
+    encryptedMsgHash :: MsgHash
   }
 
 data RcvMsg = RcvMsg
@@ -420,6 +503,7 @@ data PendingMsgData = PendingMsgData
     msgType :: AgentMessageType,
     msgFlags :: MsgFlags,
     msgBody :: MsgBody,
+    msgRetryState :: Maybe RI2State,
     internalTs :: InternalTs
   }
   deriving (Show)
@@ -471,8 +555,12 @@ data StoreError
     SEInternal ByteString
   | -- | Failed to generate unique random ID
     SEUniqueID
+  | -- | User ID not found
+    SEUserNotFound
   | -- | Connection not found (or both queues absent).
     SEConnNotFound
+  | -- | Server not found.
+    SEServerNotFound
   | -- | Connection already used.
     SEConnDuplicate
   | -- | Wrong connection type, e.g. "send" connection when "receive" or "duplex" is expected, or vice versa.
@@ -496,4 +584,10 @@ data StoreError
     SEX3dhKeysNotFound
   | -- | Used to wrap agent errors inside store operations to avoid race conditions
     SEAgentError AgentErrorType
+  | -- | XFTP Server not found.
+    SEXFTPServerNotFound
+  | -- | XFTP File not found.
+    SEFileNotFound
+  | -- | XFTP Deleted snd chunk replica not found.
+    SEDeletedSndChunkReplicaNotFound
   deriving (Eq, Show, Exception)

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

@@ -1,25 +1,38 @@
+{-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE OverloadedLists #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE QuasiQuotes #-}
 {-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE StrictData #-}
 {-# LANGUAGE TemplateHaskell #-}
 {-# LANGUAGE TupleSections #-}
 
 module Simplex.Messaging.Agent.Store.SQLite.Migrations
   ( Migration (..),
+    MigrationsToRun (..),
+    MTRError (..),
+    DownMigration (..),
     app,
     initialize,
     get,
     run,
+    getCurrent,
+    mtrErrorDescription,
+    -- for unit tests
+    migrationsToRun,
+    toDownMigration,
   )
 where
 
 import Control.Monad (forM_, when)
+import Data.Aeson (ToJSON)
+import qualified Data.Aeson as J
 import Data.List (intercalate, sortOn)
 import Data.List.NonEmpty (NonEmpty)
 import qualified Data.Map as M
+import Data.Maybe (isNothing, mapMaybe)
 import Data.Text (Text)
 import Data.Text.Encoding (decodeLatin1)
 import Data.Time.Clock (getCurrentTime)
@@ -27,6 +40,7 @@ import Database.SQLite.Simple (Connection, Only (..), Query (..))
 import qualified Database.SQLite.Simple as DB
 import Database.SQLite.Simple.QQ (sql)
 import qualified Database.SQLite3 as SQLite3
+import GHC.Generics (Generic)
 import Simplex.Messaging.Agent.Protocol (extraSMPServerHosts)
 import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220101_initial
 import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220301_snd_queue_keys
@@ -37,63 +51,133 @@ import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220811_onion_hosts
 import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220817_connection_ntfs
 import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220905_commands
 import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20220915_connection_queues
+import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230110_users
+import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230117_fkey_indexes
+import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230120_delete_errors
+import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230217_server_key_hash
+import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230223_files
+import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230320_retry_state
+import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230401_snd_files
+import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230510_files_pending_replicas_indexes
+import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230516_encrypted_rcv_message_hashes
+import Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230531_switch_status
 import Simplex.Messaging.Encoding.String
+import Simplex.Messaging.Parsers (dropPrefix, sumTypeJSON)
 import Simplex.Messaging.Transport.Client (TransportHost)
 
-data Migration = Migration {name :: String, up :: Text}
-  deriving (Show)
+data Migration = Migration {name :: String, up :: Text, down :: Maybe Text}
+  deriving (Eq, Show)
 
-schemaMigrations :: [(String, Query)]
+schemaMigrations :: [(String, Query, Maybe Query)]
 schemaMigrations =
-  [ ("20220101_initial", m20220101_initial),
-    ("20220301_snd_queue_keys", m20220301_snd_queue_keys),
-    ("20220322_notifications", m20220322_notifications),
-    ("20220607_v2", m20220608_v2),
-    ("m20220625_v2_ntf_mode", m20220625_v2_ntf_mode),
-    ("m20220811_onion_hosts", m20220811_onion_hosts),
-    ("m20220817_connection_ntfs", m20220817_connection_ntfs),
-    ("m20220905_commands", m20220905_commands),
-    ("m20220915_connection_queues", m20220915_connection_queues)
+  [ ("20220101_initial", m20220101_initial, Nothing),
+    ("20220301_snd_queue_keys", m20220301_snd_queue_keys, Nothing),
+    ("20220322_notifications", m20220322_notifications, Nothing),
+    ("20220607_v2", m20220608_v2, Nothing),
+    ("m20220625_v2_ntf_mode", m20220625_v2_ntf_mode, Nothing),
+    ("m20220811_onion_hosts", m20220811_onion_hosts, Nothing),
+    ("m20220817_connection_ntfs", m20220817_connection_ntfs, Nothing),
+    ("m20220905_commands", m20220905_commands, Nothing),
+    ("m20220915_connection_queues", m20220915_connection_queues, Nothing),
+    ("m20230110_users", m20230110_users, Nothing),
+    ("m20230117_fkey_indexes", m20230117_fkey_indexes, Nothing),
+    ("m20230120_delete_errors", m20230120_delete_errors, Nothing),
+    ("m20230217_server_key_hash", m20230217_server_key_hash, Nothing),
+    ("m20230223_files", m20230223_files, Just down_m20230223_files),
+    ("m20230320_retry_state", m20230320_retry_state, Just down_m20230320_retry_state),
+    ("m20230401_snd_files", m20230401_snd_files, Just down_m20230401_snd_files),
+    ("m20230510_files_pending_replicas_indexes", m20230510_files_pending_replicas_indexes, Just down_m20230510_files_pending_replicas_indexes),
+    ("m20230516_encrypted_rcv_message_hashes", m20230516_encrypted_rcv_message_hashes, Just down_m20230516_encrypted_rcv_message_hashes),
+    ("m20230531_switch_status", m20230531_switch_status, Just down_m20230531_switch_status)
   ]
 
 -- | The list of migrations in ascending order by date
 app :: [Migration]
 app = sortOn name $ map migration schemaMigrations
   where
-    migration (name, query) = Migration {name = name, up = fromQuery query}
+    migration (name, up, down) = Migration {name, up = fromQuery up, down = fromQuery <$> down}
 
-get :: Connection -> [Migration] -> IO (Either String [Migration])
-get conn migrations =
-  migrationsToRun migrations . map fromOnly
-    <$> DB.query_ conn "SELECT name FROM migrations ORDER BY name ASC;"
+get :: Connection -> [Migration] -> IO (Either MTRError MigrationsToRun)
+get db migrations = migrationsToRun migrations <$> getCurrent db
 
-run :: Connection -> [Migration] -> IO ()
-run conn ms = forM_ ms $ \Migration {name, up} -> do
-  when (name == "m20220811_onion_hosts") updateServers
-  DB.withImmediateTransaction conn $ insert name >> execSQL up
+getCurrent :: Connection -> IO [Migration]
+getCurrent db = map toMigration <$> DB.query_ db "SELECT name, down FROM migrations ORDER BY name ASC;"
   where
-    insert name = DB.execute conn "INSERT INTO migrations (name, ts) VALUES (?, ?);" . (name,) =<< getCurrentTime
-    execSQL = SQLite3.exec $ DB.connectionHandle conn
-    updateServers = forM_ (M.assocs extraSMPServerHosts) $ \(h, h') ->
-      DB.withImmediateTransaction conn $
-        let hs = decodeLatin1 . strEncode $ ([h, h'] :: NonEmpty TransportHost)
-         in DB.execute conn "UPDATE servers SET host = ? WHERE host = ?" (hs, decodeLatin1 $ strEncode h)
+    toMigration (name, down) = Migration {name, up = "", down}
+
+run :: Connection -> MigrationsToRun -> IO ()
+run db = \case
+  MTRUp [] -> pure ()
+  MTRUp ms -> mapM_ runUp ms >> execSQL "VACUUM;"
+  MTRDown ms -> mapM_ runDown $ reverse ms
+  MTRNone -> pure ()
+  where
+    runUp Migration {name, up, down} = do
+      when (name == "m20220811_onion_hosts") updateServers
+      DB.withImmediateTransaction db $ insert >> execSQL up
+      where
+        insert = DB.execute db "INSERT INTO migrations (name, down, ts) VALUES (?,?,?)" . (name,down,) =<< getCurrentTime
+        updateServers = forM_ (M.assocs extraSMPServerHosts) $ \(h, h') ->
+          DB.withImmediateTransaction db $
+            let hs = decodeLatin1 . strEncode $ ([h, h'] :: NonEmpty TransportHost)
+             in DB.execute db "UPDATE servers SET host = ? WHERE host = ?" (hs, decodeLatin1 $ strEncode h)
+    runDown DownMigration {downName, downQuery} = do
+      DB.withImmediateTransaction db $ do
+        execSQL downQuery
+        DB.execute db "DELETE FROM migrations WHERE name = ?" (Only downName)
+    execSQL = SQLite3.exec $ DB.connectionHandle db
 
 initialize :: Connection -> IO ()
-initialize conn =
-  DB.execute_
-    conn
-    [sql|
-      CREATE TABLE IF NOT EXISTS migrations (
-        name TEXT NOT NULL,
-        ts TEXT NOT NULL,
-        PRIMARY KEY (name)
-      );
-    |]
+initialize db = do
+  cs :: [Text] <- map fromOnly <$> DB.query_ db "SELECT name FROM pragma_table_info('migrations')"
+  case cs of
+    [] -> createMigrations
+    _ -> when ("down" `notElem` cs) $ DB.execute_ db "ALTER TABLE migrations ADD COLUMN down TEXT"
+  where
+    createMigrations =
+      DB.execute_
+        db
+        [sql|
+          CREATE TABLE IF NOT EXISTS migrations (
+            name TEXT NOT NULL,
+            ts TEXT NOT NULL,
+            down TEXT,
+            PRIMARY KEY (name)
+          );
+        |]
 
-migrationsToRun :: [Migration] -> [String] -> Either String [Migration]
-migrationsToRun appMs [] = Right appMs
-migrationsToRun [] dbMs = Left $ "database version is newer than the app: " <> intercalate ", " dbMs
+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, Generic)
+
+instance ToJSON MTRError where
+  toJSON = J.genericToJSON . sumTypeJSON $ dropPrefix "MTRE"
+  toEncoding = J.genericToEncoding . sumTypeJSON $ dropPrefix "MTRE"
+
+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 == d = migrationsToRun as ds
-  | otherwise = Left $ "different migration in the app/database: " <> name a <> " / " <> d
+  | name a == name d = migrationsToRun as ds
+  | otherwise = Left $ MTREDifferent (name a) (name d)

src/Simplex/Messaging/Agent/Store/SQLite/Migrations/M20230110_users.hs

@@ -0,0 +1,29 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230110_users where
+
+import Database.SQLite.Simple (Query)
+import Database.SQLite.Simple.QQ (sql)
+
+m20230110_users :: Query
+m20230110_users =
+  [sql|
+PRAGMA ignore_check_constraints=ON;
+
+CREATE TABLE users (
+  user_id INTEGER PRIMARY KEY AUTOINCREMENT
+);
+
+INSERT INTO users (user_id) VALUES (1);
+
+ALTER TABLE connections ADD COLUMN user_id INTEGER CHECK (user_id NOT NULL)
+REFERENCES users ON DELETE CASCADE;
+
+CREATE INDEX idx_connections_user ON connections(user_id);
+
+CREATE INDEX idx_commands_conn_id ON commands(conn_id);
+
+UPDATE connections SET user_id = 1;
+
+PRAGMA ignore_check_constraints=OFF;
+|]

src/Simplex/Messaging/Agent/Store/SQLite/Migrations/M20230117_fkey_indexes.hs

@@ -0,0 +1,27 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230117_fkey_indexes where
+
+import Database.SQLite.Simple (Query)
+import Database.SQLite.Simple.QQ (sql)
+
+-- .lint fkey-indexes
+m20230117_fkey_indexes :: Query
+m20230117_fkey_indexes =
+  [sql|
+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);
+|]

src/Simplex/Messaging/Agent/Store/SQLite/Migrations/M20230120_delete_errors.hs

@@ -0,0 +1,20 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230120_delete_errors where
+
+import Database.SQLite.Simple (Query)
+import Database.SQLite.Simple.QQ (sql)
+
+m20230120_delete_errors :: Query
+m20230120_delete_errors =
+  [sql|
+PRAGMA ignore_check_constraints=ON;
+
+ALTER TABLE rcv_queues ADD COLUMN delete_errors INTEGER DEFAULT 0 CHECK (delete_errors NOT NULL);
+UPDATE rcv_queues SET delete_errors = 0;
+
+ALTER TABLE users ADD COLUMN deleted INTEGER DEFAULT 0 CHECK (deleted NOT NULL);
+UPDATE users SET deleted = 0;
+
+PRAGMA ignore_check_constraints=OFF;
+|]

src/Simplex/Messaging/Agent/Store/SQLite/Migrations/M20230217_server_key_hash.hs

@@ -0,0 +1,20 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230217_server_key_hash where
+
+import Database.SQLite.Simple (Query)
+import Database.SQLite.Simple.QQ (sql)
+
+-- server_key_hash is not null for records whose entities refer to a server
+-- that was previously saved with the same host and port but different key hash
+m20230217_server_key_hash :: Query
+m20230217_server_key_hash =
+  [sql|
+ALTER TABLE rcv_queues ADD COLUMN server_key_hash BLOB;
+
+ALTER TABLE snd_queues ADD COLUMN server_key_hash BLOB;
+
+ALTER TABLE ntf_subscriptions ADD COLUMN smp_server_key_hash BLOB;
+
+ALTER TABLE commands ADD COLUMN server_key_hash BLOB;
+|]

src/Simplex/Messaging/Agent/Store/SQLite/Migrations/M20230223_files.hs

@@ -0,0 +1,89 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230223_files where
+
+import Database.SQLite.Simple (Query)
+import Database.SQLite.Simple.QQ (sql)
+
+m20230223_files :: Query
+m20230223_files =
+  [sql|
+CREATE TABLE xftp_servers (
+  xftp_server_id INTEGER PRIMARY KEY,
+  xftp_host TEXT NOT NULL,
+  xftp_port TEXT NOT NULL,
+  xftp_key_hash BLOB NOT NULL,
+  created_at TEXT NOT NULL DEFAULT (datetime('now')),
+  updated_at TEXT NOT NULL DEFAULT (datetime('now')),
+  UNIQUE(xftp_host, xftp_port, xftp_key_hash)
+);
+
+CREATE TABLE rcv_files (
+  rcv_file_id INTEGER PRIMARY KEY,
+  rcv_file_entity_id BLOB NOT NULL,
+  user_id INTEGER NOT NULL REFERENCES users ON DELETE CASCADE,
+  size INTEGER NOT NULL,
+  digest BLOB NOT NULL,
+  key BLOB NOT NULL,
+  nonce BLOB NOT NULL,
+  chunk_size INTEGER NOT NULL,
+  prefix_path TEXT NOT NULL,
+  tmp_path TEXT,
+  save_path TEXT NOT NULL,
+  status TEXT NOT NULL,
+  deleted INTEGER NOT NULL DEFAULT 0,
+  error TEXT,
+  created_at TEXT NOT NULL DEFAULT (datetime('now')),
+  updated_at TEXT NOT NULL DEFAULT (datetime('now')),
+  UNIQUE(rcv_file_entity_id)
+);
+
+CREATE INDEX idx_rcv_files_user_id ON rcv_files(user_id);
+
+CREATE TABLE rcv_file_chunks (
+  rcv_file_chunk_id INTEGER PRIMARY KEY,
+  rcv_file_id INTEGER NOT NULL REFERENCES rcv_files ON DELETE CASCADE,
+  chunk_no INTEGER NOT NULL,
+  chunk_size INTEGER NOT NULL,
+  digest BLOB NOT NULL,
+  tmp_path TEXT,
+  created_at TEXT NOT NULL DEFAULT (datetime('now')),
+  updated_at TEXT NOT NULL DEFAULT (datetime('now'))
+);
+
+CREATE INDEX idx_rcv_file_chunks_rcv_file_id ON rcv_file_chunks(rcv_file_id);
+
+CREATE TABLE rcv_file_chunk_replicas (
+  rcv_file_chunk_replica_id INTEGER PRIMARY KEY,
+  rcv_file_chunk_id INTEGER NOT NULL REFERENCES rcv_file_chunks ON DELETE CASCADE,
+  replica_number INTEGER NOT NULL,
+  xftp_server_id INTEGER NOT NULL REFERENCES xftp_servers ON DELETE CASCADE,
+  replica_id BLOB NOT NULL,
+  replica_key BLOB NOT NULL,
+  received INTEGER NOT NULL DEFAULT 0,
+  delay INTEGER,
+  retries INTEGER NOT NULL DEFAULT 0,
+  created_at TEXT NOT NULL DEFAULT (datetime('now')),
+  updated_at TEXT NOT NULL DEFAULT (datetime('now'))
+);
+
+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);
+|]
+
+-- this is for tests, older versions do not support down migrations
+down_m20230223_files :: Query
+down_m20230223_files =
+  [sql|
+DROP INDEX idx_rcv_file_chunk_replicas_xftp_server_id;
+DROP INDEX idx_rcv_file_chunk_replicas_rcv_file_chunk_id;
+DROP TABLE rcv_file_chunk_replicas;
+
+DROP INDEX idx_rcv_file_chunks_rcv_file_id;
+DROP TABLE rcv_file_chunks;
+
+DROP INDEX idx_rcv_files_user_id;
+DROP TABLE rcv_files;
+
+DROP TABLE xftp_servers;
+|]

src/Simplex/Messaging/Agent/Store/SQLite/Migrations/M20230320_retry_state.hs

@@ -0,0 +1,21 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230320_retry_state where
+
+import Database.SQLite.Simple (Query)
+import Database.SQLite.Simple.QQ (sql)
+
+m20230320_retry_state :: Query
+m20230320_retry_state =
+  [sql|
+ALTER TABLE snd_messages ADD COLUMN retry_int_slow INTEGER;
+ALTER TABLE snd_messages ADD COLUMN retry_int_fast INTEGER;
+|]
+
+-- this is for tests, older versions do not support down migrations
+down_m20230320_retry_state :: Query
+down_m20230320_retry_state =
+  [sql|
+ALTER TABLE snd_messages DROP COLUMN retry_int_fast;
+ALTER TABLE snd_messages DROP COLUMN retry_int_slow;
+|]

src/Simplex/Messaging/Agent/Store/SQLite/Migrations/M20230401_snd_files.hs

@@ -0,0 +1,107 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230401_snd_files where
+
+import Database.SQLite.Simple (Query)
+import Database.SQLite.Simple.QQ (sql)
+
+m20230401_snd_files :: Query
+m20230401_snd_files =
+  [sql|
+CREATE TABLE snd_files (
+  snd_file_id INTEGER PRIMARY KEY,
+  snd_file_entity_id BLOB NOT NULL,
+  user_id INTEGER NOT NULL REFERENCES users ON DELETE CASCADE,
+  num_recipients INTEGER NOT NULL,
+  digest BLOB,
+  key BLOB NOT NUll,
+  nonce BLOB NOT NUll,
+  path TEXT NOT NULL,
+  prefix_path TEXT,
+  status TEXT NOT NULL,
+  deleted INTEGER NOT NULL DEFAULT 0,
+  error TEXT,
+  created_at TEXT NOT NULL DEFAULT (datetime('now')),
+  updated_at TEXT NOT NULL DEFAULT (datetime('now'))
+);
+
+CREATE INDEX idx_snd_files_user_id ON snd_files(user_id);
+
+CREATE TABLE snd_file_chunks (
+  snd_file_chunk_id INTEGER PRIMARY KEY,
+  snd_file_id INTEGER NOT NULL REFERENCES snd_files ON DELETE CASCADE,
+  chunk_no INTEGER NOT NULL,
+  chunk_offset INTEGER NOT NULL,
+  chunk_size INTEGER NOT NULL,
+  digest BLOB NOT NULL,
+  created_at TEXT NOT NULL DEFAULT (datetime('now')),
+  updated_at TEXT NOT NULL DEFAULT (datetime('now'))
+);
+
+CREATE INDEX idx_snd_file_chunks_snd_file_id ON snd_file_chunks(snd_file_id);
+
+CREATE TABLE snd_file_chunk_replicas (
+  snd_file_chunk_replica_id INTEGER PRIMARY KEY,
+  snd_file_chunk_id INTEGER NOT NULL REFERENCES snd_file_chunks ON DELETE CASCADE,
+  replica_number INTEGER NOT NULL,
+  xftp_server_id INTEGER NOT NULL REFERENCES xftp_servers ON DELETE CASCADE,
+  replica_id BLOB NOT NULL,
+  replica_key BLOB NOT NULL,
+  replica_status TEXT NOT NULL,
+  delay INTEGER,
+  retries INTEGER NOT NULL DEFAULT 0,
+  created_at TEXT NOT NULL DEFAULT (datetime('now')),
+  updated_at TEXT NOT NULL DEFAULT (datetime('now'))
+);
+
+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 TABLE snd_file_chunk_replica_recipients (
+  snd_file_chunk_replica_recipient_id INTEGER PRIMARY KEY,
+  snd_file_chunk_replica_id INTEGER NOT NULL REFERENCES snd_file_chunk_replicas ON DELETE CASCADE,
+  rcv_replica_id BLOB NOT NULL,
+  rcv_replica_key BLOB NOT NULL,
+  created_at TEXT NOT NULL DEFAULT (datetime('now')),
+  updated_at TEXT NOT NULL DEFAULT (datetime('now'))
+);
+
+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 TABLE deleted_snd_chunk_replicas (
+  deleted_snd_chunk_replica_id INTEGER PRIMARY KEY,
+  user_id INTEGER NOT NULL REFERENCES users ON DELETE CASCADE,
+  xftp_server_id INTEGER NOT NULL REFERENCES xftp_servers ON DELETE CASCADE,
+  replica_id BLOB NOT NULL,
+  replica_key BLOB NOT NULL,
+  chunk_digest BLOB NOT NULL,
+  delay INTEGER,
+  retries INTEGER NOT NULL DEFAULT 0,
+  created_at TEXT NOT NULL DEFAULT (datetime('now')),
+  updated_at TEXT NOT NULL DEFAULT (datetime('now'))
+);
+
+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);
+|]
+
+down_m20230401_snd_files :: Query
+down_m20230401_snd_files =
+  [sql|
+DROP INDEX idx_deleted_snd_chunk_replicas_xftp_server_id;
+DROP INDEX idx_deleted_snd_chunk_replicas_user_id;
+DROP TABLE deleted_snd_chunk_replicas;
+
+DROP INDEX idx_snd_file_chunk_replica_recipients_snd_file_chunk_replica_id;
+DROP TABLE snd_file_chunk_replica_recipients;
+
+DROP INDEX idx_snd_file_chunk_replicas_snd_file_chunk_id;
+DROP INDEX idx_snd_file_chunk_replicas_xftp_server_id;
+DROP TABLE snd_file_chunk_replicas;
+
+DROP INDEX idx_snd_file_chunks_snd_file_id;
+DROP TABLE snd_file_chunks;
+
+DROP INDEX idx_snd_files_user_id;
+DROP TABLE snd_files;
+|]

src/Simplex/Messaging/Agent/Store/SQLite/Migrations/M20230510_files_pending_replicas_indexes.hs

@@ -0,0 +1,22 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230510_files_pending_replicas_indexes where
+
+import Database.SQLite.Simple (Query)
+import Database.SQLite.Simple.QQ (sql)
+
+m20230510_files_pending_replicas_indexes :: Query
+m20230510_files_pending_replicas_indexes =
+  [sql|
+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);
+|]
+
+down_m20230510_files_pending_replicas_indexes :: Query
+down_m20230510_files_pending_replicas_indexes =
+  [sql|
+DROP INDEX idx_deleted_snd_chunk_replicas_pending;
+DROP INDEX idx_snd_file_chunk_replicas_pending;
+DROP INDEX idx_rcv_file_chunk_replicas_pending;
+|]

src/Simplex/Messaging/Agent/Store/SQLite/Migrations/M20230516_encrypted_rcv_message_hashes.hs

@@ -0,0 +1,28 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230516_encrypted_rcv_message_hashes where
+
+import Database.SQLite.Simple (Query)
+import Database.SQLite.Simple.QQ (sql)
+
+m20230516_encrypted_rcv_message_hashes :: Query
+m20230516_encrypted_rcv_message_hashes =
+  [sql|
+CREATE TABLE encrypted_rcv_message_hashes(
+  encrypted_rcv_message_hash_id INTEGER PRIMARY KEY,
+  conn_id BLOB NOT NULL REFERENCES connections ON DELETE CASCADE,
+  hash BLOB NOT NULL,
+  created_at TEXT NOT NULL DEFAULT (datetime('now')),
+  updated_at TEXT NOT NULL DEFAULT (datetime('now'))
+);
+
+CREATE INDEX idx_encrypted_rcv_message_hashes_hash ON encrypted_rcv_message_hashes(conn_id, hash);
+|]
+
+down_m20230516_encrypted_rcv_message_hashes :: Query
+down_m20230516_encrypted_rcv_message_hashes =
+  [sql|
+DROP INDEX idx_encrypted_rcv_message_hashes_hash;
+
+DROP TABLE encrypted_rcv_message_hashes;
+|]

src/Simplex/Messaging/Agent/Store/SQLite/Migrations/M20230531_switch_status.hs

@@ -0,0 +1,22 @@
+{-# LANGUAGE QuasiQuotes #-}
+
+module Simplex.Messaging.Agent.Store.SQLite.Migrations.M20230531_switch_status where
+
+import Database.SQLite.Simple (Query)
+import Database.SQLite.Simple.QQ (sql)
+
+m20230531_switch_status :: Query
+m20230531_switch_status =
+  [sql|
+ALTER TABLE rcv_queues ADD COLUMN switch_status TEXT;
+ALTER TABLE rcv_queues ADD COLUMN deleted INTEGER NOT NULL DEFAULT 0;
+ALTER TABLE snd_queues ADD COLUMN switch_status TEXT;
+|]
+
+down_m20230531_switch_status :: Query
+down_m20230531_switch_status =
+  [sql|
+ALTER TABLE snd_queues DROP COLUMN switch_status;
+ALTER TABLE rcv_queues DROP COLUMN deleted;
+ALTER TABLE rcv_queues DROP COLUMN switch_status;
+|]

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

@@ -1,6 +1,7 @@
 CREATE TABLE migrations(
   name TEXT NOT NULL,
   ts TEXT NOT NULL,
+  down TEXT,
   PRIMARY KEY(name)
 );
 CREATE TABLE servers(
@@ -22,7 +23,9 @@ CREATE TABLE connections(
   ,
   duplex_handshake INTEGER NULL DEFAULT 0,
   enable_ntfs INTEGER,
-  deleted INTEGER DEFAULT 0 CHECK(deleted NOT NULL)
+  deleted INTEGER DEFAULT 0 CHECK(deleted NOT NULL),
+  user_id INTEGER CHECK(user_id NOT NULL)
+  REFERENCES users ON DELETE CASCADE
 ) WITHOUT ROWID;
 CREATE TABLE rcv_queues(
   host TEXT NOT NULL,
@@ -45,6 +48,10 @@ CREATE TABLE rcv_queues(
   rcv_queue_id INTEGER CHECK(rcv_queue_id NOT NULL),
   rcv_primary INTEGER CHECK(rcv_primary NOT NULL),
   replace_rcv_queue_id INTEGER NULL,
+  delete_errors INTEGER DEFAULT 0 CHECK(delete_errors NOT NULL),
+  server_key_hash BLOB,
+  switch_status TEXT,
+  deleted INTEGER NOT NULL DEFAULT 0,
   PRIMARY KEY(host, port, rcv_id),
   FOREIGN KEY(host, port) REFERENCES servers
   ON DELETE RESTRICT ON UPDATE CASCADE,
@@ -65,6 +72,8 @@ CREATE TABLE snd_queues(
   snd_queue_id INTEGER CHECK(snd_queue_id NOT NULL),
   snd_primary INTEGER CHECK(snd_primary NOT NULL),
   replace_snd_queue_id INTEGER NULL,
+  server_key_hash BLOB,
+  switch_status TEXT,
   PRIMARY KEY(host, port, snd_id),
   FOREIGN KEY(host, port) REFERENCES servers
   ON DELETE RESTRICT ON UPDATE CASCADE
@@ -107,6 +116,8 @@ CREATE TABLE snd_messages(
   internal_id INTEGER NOT NULL,
   internal_hash BLOB NOT NULL,
   previous_msg_hash BLOB NOT NULL DEFAULT x'',
+  retry_int_slow INTEGER,
+  retry_int_fast INTEGER,
   PRIMARY KEY(conn_id, internal_snd_id),
   FOREIGN KEY(conn_id, internal_id) REFERENCES messages
   ON DELETE CASCADE
@@ -180,7 +191,6 @@ tkn_dh_secret BLOB, -- DH secret for e2e encryption of notifications
   FOREIGN KEY(ntf_host, ntf_port) REFERENCES ntf_servers
   ON DELETE RESTRICT ON UPDATE CASCADE
 ) WITHOUT ROWID;
-CREATE UNIQUE INDEX idx_rcv_queues_ntf ON rcv_queues(host, port, ntf_id);
 CREATE TABLE ntf_subscriptions(
   conn_id BLOB NOT NULL,
   smp_host TEXT NULL,
@@ -196,6 +206,7 @@ CREATE TABLE ntf_subscriptions(
   updated_by_supervisor INTEGER NOT NULL DEFAULT 0, -- to be checked on updates by workers to not overwrite supervisor command(state still should be updated)
   created_at TEXT NOT NULL DEFAULT(datetime('now')),
   updated_at TEXT NOT NULL DEFAULT(datetime('now')),
+  smp_server_key_hash BLOB,
   PRIMARY KEY(conn_id),
   FOREIGN KEY(smp_host, smp_port) REFERENCES servers(host, port)
   ON DELETE SET NULL ON UPDATE CASCADE,
@@ -211,11 +222,10 @@ CREATE TABLE commands(
   command_tag BLOB NOT NULL,
   command BLOB NOT NULL,
   agent_version INTEGER NOT NULL DEFAULT 1,
+  server_key_hash BLOB,
   FOREIGN KEY(host, port) REFERENCES servers
   ON DELETE RESTRICT ON UPDATE CASCADE
 );
-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 TABLE snd_message_deliveries(
   snd_message_delivery_id INTEGER PRIMARY KEY AUTOINCREMENT,
   conn_id BLOB NOT NULL REFERENCES connections ON DELETE CASCADE,
@@ -224,7 +234,215 @@ CREATE TABLE snd_message_deliveries(
   FOREIGN KEY(conn_id, internal_id) REFERENCES messages ON DELETE CASCADE DEFERRABLE INITIALLY DEFERRED
 );
 CREATE TABLE sqlite_sequence(name,seq);
+CREATE TABLE users(
+  user_id INTEGER PRIMARY KEY AUTOINCREMENT
+  ,
+  deleted INTEGER DEFAULT 0 CHECK(deleted NOT NULL)
+);
+CREATE TABLE xftp_servers(
+  xftp_server_id INTEGER PRIMARY KEY,
+  xftp_host TEXT NOT NULL,
+  xftp_port TEXT NOT NULL,
+  xftp_key_hash BLOB NOT NULL,
+  created_at TEXT NOT NULL DEFAULT(datetime('now')),
+  updated_at TEXT NOT NULL DEFAULT(datetime('now')),
+  UNIQUE(xftp_host, xftp_port, xftp_key_hash)
+);
+CREATE TABLE rcv_files(
+  rcv_file_id INTEGER PRIMARY KEY,
+  rcv_file_entity_id BLOB NOT NULL,
+  user_id INTEGER NOT NULL REFERENCES users ON DELETE CASCADE,
+  size INTEGER NOT NULL,
+  digest BLOB NOT NULL,
+  key BLOB NOT NULL,
+  nonce BLOB NOT NULL,
+  chunk_size INTEGER NOT NULL,
+  prefix_path TEXT NOT NULL,
+  tmp_path TEXT,
+  save_path TEXT NOT NULL,
+  status TEXT NOT NULL,
+  deleted INTEGER NOT NULL DEFAULT 0,
+  error TEXT,
+  created_at TEXT NOT NULL DEFAULT(datetime('now')),
+  updated_at TEXT NOT NULL DEFAULT(datetime('now')),
+  UNIQUE(rcv_file_entity_id)
+);
+CREATE TABLE rcv_file_chunks(
+  rcv_file_chunk_id INTEGER PRIMARY KEY,
+  rcv_file_id INTEGER NOT NULL REFERENCES rcv_files ON DELETE CASCADE,
+  chunk_no INTEGER NOT NULL,
+  chunk_size INTEGER NOT NULL,
+  digest BLOB NOT NULL,
+  tmp_path TEXT,
+  created_at TEXT NOT NULL DEFAULT(datetime('now')),
+  updated_at TEXT NOT NULL DEFAULT(datetime('now'))
+);
+CREATE TABLE rcv_file_chunk_replicas(
+  rcv_file_chunk_replica_id INTEGER PRIMARY KEY,
+  rcv_file_chunk_id INTEGER NOT NULL REFERENCES rcv_file_chunks ON DELETE CASCADE,
+  replica_number INTEGER NOT NULL,
+  xftp_server_id INTEGER NOT NULL REFERENCES xftp_servers ON DELETE CASCADE,
+  replica_id BLOB NOT NULL,
+  replica_key BLOB NOT NULL,
+  received INTEGER NOT NULL DEFAULT 0,
+  delay INTEGER,
+  retries INTEGER NOT NULL DEFAULT 0,
+  created_at TEXT NOT NULL DEFAULT(datetime('now')),
+  updated_at TEXT NOT NULL DEFAULT(datetime('now'))
+);
+CREATE TABLE snd_files(
+  snd_file_id INTEGER PRIMARY KEY,
+  snd_file_entity_id BLOB NOT NULL,
+  user_id INTEGER NOT NULL REFERENCES users ON DELETE CASCADE,
+  num_recipients INTEGER NOT NULL,
+  digest BLOB,
+  key BLOB NOT NUll,
+  nonce BLOB NOT NUll,
+  path TEXT NOT NULL,
+  prefix_path TEXT,
+  status TEXT NOT NULL,
+  deleted INTEGER NOT NULL DEFAULT 0,
+  error TEXT,
+  created_at TEXT NOT NULL DEFAULT(datetime('now')),
+  updated_at TEXT NOT NULL DEFAULT(datetime('now'))
+);
+CREATE TABLE snd_file_chunks(
+  snd_file_chunk_id INTEGER PRIMARY KEY,
+  snd_file_id INTEGER NOT NULL REFERENCES snd_files ON DELETE CASCADE,
+  chunk_no INTEGER NOT NULL,
+  chunk_offset INTEGER NOT NULL,
+  chunk_size INTEGER NOT NULL,
+  digest BLOB NOT NULL,
+  created_at TEXT NOT NULL DEFAULT(datetime('now')),
+  updated_at TEXT NOT NULL DEFAULT(datetime('now'))
+);
+CREATE TABLE snd_file_chunk_replicas(
+  snd_file_chunk_replica_id INTEGER PRIMARY KEY,
+  snd_file_chunk_id INTEGER NOT NULL REFERENCES snd_file_chunks ON DELETE CASCADE,
+  replica_number INTEGER NOT NULL,
+  xftp_server_id INTEGER NOT NULL REFERENCES xftp_servers ON DELETE CASCADE,
+  replica_id BLOB NOT NULL,
+  replica_key BLOB NOT NULL,
+  replica_status TEXT NOT NULL,
+  delay INTEGER,
+  retries INTEGER NOT NULL DEFAULT 0,
+  created_at TEXT NOT NULL DEFAULT(datetime('now')),
+  updated_at TEXT NOT NULL DEFAULT(datetime('now'))
+);
+CREATE TABLE snd_file_chunk_replica_recipients(
+  snd_file_chunk_replica_recipient_id INTEGER PRIMARY KEY,
+  snd_file_chunk_replica_id INTEGER NOT NULL REFERENCES snd_file_chunk_replicas ON DELETE CASCADE,
+  rcv_replica_id BLOB NOT NULL,
+  rcv_replica_key BLOB NOT NULL,
+  created_at TEXT NOT NULL DEFAULT(datetime('now')),
+  updated_at TEXT NOT NULL DEFAULT(datetime('now'))
+);
+CREATE TABLE deleted_snd_chunk_replicas(
+  deleted_snd_chunk_replica_id INTEGER PRIMARY KEY,
+  user_id INTEGER NOT NULL REFERENCES users ON DELETE CASCADE,
+  xftp_server_id INTEGER NOT NULL REFERENCES xftp_servers ON DELETE CASCADE,
+  replica_id BLOB NOT NULL,
+  replica_key BLOB NOT NULL,
+  chunk_digest BLOB NOT NULL,
+  delay INTEGER,
+  retries INTEGER NOT NULL DEFAULT 0,
+  created_at TEXT NOT NULL DEFAULT(datetime('now')),
+  updated_at TEXT NOT NULL DEFAULT(datetime('now'))
+);
+CREATE TABLE encrypted_rcv_message_hashes(
+  encrypted_rcv_message_hash_id INTEGER PRIMARY KEY,
+  conn_id BLOB NOT NULL REFERENCES connections ON DELETE CASCADE,
+  hash BLOB NOT NULL,
+  created_at TEXT NOT NULL DEFAULT(datetime('now')),
+  updated_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);
 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
+);

src/Simplex/Messaging/Agent/TAsyncs.hs

@@ -0,0 +1,25 @@
+module Simplex.Messaging.Agent.TAsyncs where
+
+import Control.Concurrent.STM (stateTVar)
+import Control.Monad.IO.Unlift (MonadUnliftIO)
+import Simplex.Messaging.TMap (TMap)
+import qualified Simplex.Messaging.TMap as TM
+import UnliftIO.Async (Async, async)
+import UnliftIO.STM
+
+data TAsyncs = TAsyncs
+  { actionId :: TVar Int,
+    actions :: TMap Int (Async ())
+  }
+
+newTAsyncs :: STM TAsyncs
+newTAsyncs = TAsyncs <$> newTVar 0 <*> TM.empty
+
+newAsyncAction :: MonadUnliftIO m => (Int -> m ()) -> TAsyncs -> m ()
+newAsyncAction action as = do
+  aId <- atomically $ stateTVar (actionId as) $ \i -> (i + 1, i + 1)
+  a <- async $ action aId
+  atomically $ TM.insert aId a $ actions as
+
+removeAsyncAction :: Int -> TAsyncs -> STM ()
+removeAsyncAction aId = TM.delete aId . actions

src/Simplex/Messaging/Agent/TRcvQueues.hs

@@ -1,18 +1,28 @@
-{-# LANGUAGE NamedFieldPuns #-}
-
-module Simplex.Messaging.Agent.TRcvQueues where
+module Simplex.Messaging.Agent.TRcvQueues
+  ( TRcvQueues,
+    empty,
+    clear,
+    deleteConn,
+    hasConn,
+    getConns,
+    addQueue,
+    deleteQueue,
+    getSessQueues,
+    getDelSessQueues,
+  )
+where
 
 import Control.Concurrent.STM
 import qualified Data.Map.Strict as M
 import Data.Set (Set)
 import qualified Data.Set as S
-import Simplex.Messaging.Agent.Protocol (ConnId)
+import Simplex.Messaging.Agent.Protocol (ConnId, UserId)
 import Simplex.Messaging.Agent.Store (RcvQueue (..))
 import Simplex.Messaging.Protocol (RecipientId, SMPServer)
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
 
-newtype TRcvQueues = TRcvQueues (TMap (SMPServer, RecipientId) RcvQueue)
+newtype TRcvQueues = TRcvQueues (TMap (UserId, SMPServer, RecipientId) RcvQueue)
 
 empty :: STM TRcvQueues
 empty = TRcvQueues <$> TM.empty
@@ -30,19 +40,26 @@ getConns :: TRcvQueues -> STM (Set ConnId)
 getConns (TRcvQueues qs) = M.foldr' (S.insert . connId) S.empty <$> readTVar qs
 
 addQueue :: RcvQueue -> TRcvQueues -> STM ()
-addQueue rq@RcvQueue {server, rcvId} (TRcvQueues qs) = TM.insert (server, rcvId) rq qs
+addQueue rq (TRcvQueues qs) = TM.insert (qKey rq) rq qs
 
 deleteQueue :: RcvQueue -> TRcvQueues -> STM ()
-deleteQueue RcvQueue {server, rcvId} (TRcvQueues qs) = TM.delete (server, rcvId) qs
+deleteQueue rq (TRcvQueues qs) = TM.delete (qKey rq) qs
 
-getSrvQueues :: SMPServer -> TRcvQueues -> STM [RcvQueue]
-getSrvQueues srv (TRcvQueues qs) = M.foldl' addQ [] <$> readTVar qs
+getSessQueues :: (UserId, SMPServer, Maybe ConnId) -> TRcvQueues -> STM [RcvQueue]
+getSessQueues tSess (TRcvQueues qs) = M.foldl' addQ [] <$> readTVar qs
   where
-    addQ qs' rq@RcvQueue {server} = if srv == server then rq : qs' else qs'
+    addQ qs' rq = if rq `isSession` tSess then rq : qs' else qs'
 
-getDelSrvQueues :: SMPServer -> TRcvQueues -> STM ([RcvQueue], Set ConnId)
-getDelSrvQueues srv (TRcvQueues qs) = stateTVar qs $ M.foldl' addQ (([], S.empty), M.empty)
+getDelSessQueues :: (UserId, SMPServer, Maybe ConnId) -> TRcvQueues -> STM [RcvQueue]
+getDelSessQueues tSess (TRcvQueues qs) = stateTVar qs $ M.foldl' addQ ([], M.empty)
   where
-    addQ (removed@(remQs, remConns), qs') rq@RcvQueue {connId, server, rcvId}
-      | srv == server = ((rq : remQs, S.insert connId remConns), qs')
-      | otherwise = (removed, M.insert (server, rcvId) rq qs')
+    addQ (removed, qs') rq
+      | rq `isSession` tSess = (rq : removed, qs')
+      | otherwise = (removed, M.insert (qKey rq) rq qs')
+
+isSession :: RcvQueue -> (UserId, SMPServer, Maybe ConnId) -> Bool
+isSession rq (uId, srv, connId_) =
+  userId rq == uId && server rq == srv && maybe True (connId rq ==) connId_
+
+qKey :: RcvQueue -> (UserId, SMPServer, ConnId)
+qKey rq = (userId rq, server rq, connId rq)

src/Simplex/Messaging/Client.hs

@@ -26,12 +26,14 @@
 -- See https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md
 module Simplex.Messaging.Client
   ( -- * Connect (disconnect) client to (from) SMP server
+    TransportSession,
     ProtocolClient (thVersion, sessionId, sessionTs),
     SMPClient,
     getProtocolClient,
     closeProtocolClient,
-    clientServer,
+    protocolClientServer,
     transportHost',
+    transportSession',
 
     -- * SMP protocol command functions
     createSMPQueue,
@@ -39,6 +41,7 @@ module Simplex.Messaging.Client
     subscribeSMPQueues,
     getSMPMessage,
     subscribeSMPQueueNotifications,
+    subscribeSMPQueuesNtfs,
     secureSMPQueue,
     enableSMPQueueNotifications,
     disableSMPQueueNotifications,
@@ -48,21 +51,26 @@ module Simplex.Messaging.Client
     ackSMPMessage,
     suspendSMPQueue,
     deleteSMPQueue,
+    deleteSMPQueues,
     sendProtocolCommand,
 
     -- * Supporting types and client configuration
     ProtocolClientError (..),
+    SMPClientError,
     ProtocolClientConfig (..),
     NetworkConfig (..),
+    TransportSessionMode (..),
     defaultClientConfig,
     defaultNetworkConfig,
     transportClientConfig,
     chooseTransportHost,
+    proxyUsername,
+    temporaryClientError,
     ServerTransmission,
+    ClientCommand,
   )
 where
 
-import Control.Concurrent (threadDelay)
 import Control.Concurrent.Async
 import Control.Concurrent.STM
 import Control.Exception
@@ -75,6 +83,7 @@ import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
 import Data.Either (rights)
 import Data.Functor (($>))
+import Data.Int (Int64)
 import Data.List (find)
 import Data.List.NonEmpty (NonEmpty)
 import qualified Data.List.NonEmpty as L
@@ -93,40 +102,41 @@ import Simplex.Messaging.Transport
 import Simplex.Messaging.Transport.Client (SocksProxy, TransportClientConfig (..), TransportHost (..), runTransportClient)
 import Simplex.Messaging.Transport.KeepAlive
 import Simplex.Messaging.Transport.WebSockets (WS)
-import Simplex.Messaging.Util (bshow, raceAny_)
+import Simplex.Messaging.Util (bshow, raceAny_, threadDelay')
 import Simplex.Messaging.Version
 import System.Timeout (timeout)
 
 -- | 'SMPClient' is a handle used to send commands to a specific SMP server.
 --
 -- Use 'getSMPClient' to connect to an SMP server and create a client handle.
-data ProtocolClient msg = ProtocolClient
+data ProtocolClient err msg = ProtocolClient
   { action :: Maybe (Async ()),
     sessionId :: SessionId,
     sessionTs :: UTCTime,
     thVersion :: Version,
-    client_ :: PClient msg
+    client_ :: PClient err msg
   }
 
-data PClient msg = PClient
+data PClient err msg = PClient
   { connected :: TVar Bool,
-    protocolServer :: ProtoServer msg,
+    transportSession :: TransportSession msg,
     transportHost :: TransportHost,
     tcpTimeout :: Int,
+    pingErrorCount :: TVar Int,
     clientCorrId :: TVar Natural,
-    sentCommands :: TMap CorrId (Request msg),
+    sentCommands :: TMap CorrId (Request err msg),
     sndQ :: TBQueue (NonEmpty SentRawTransmission),
-    rcvQ :: TBQueue (NonEmpty (SignedTransmission msg)),
+    rcvQ :: TBQueue (NonEmpty (SignedTransmission err msg)),
     msgQ :: Maybe (TBQueue (ServerTransmission msg))
   }
 
-type SMPClient = ProtocolClient SMP.BrokerMsg
+type SMPClient = ProtocolClient ErrorType SMP.BrokerMsg
 
 -- | Type for client command data
 type ClientCommand msg = (Maybe C.APrivateSignKey, QueueId, ProtoCommand msg)
 
 -- | Type synonym for transmission from some SPM server queue.
-type ServerTransmission msg = (ProtoServer msg, Version, SessionId, QueueId, msg)
+type ServerTransmission msg = (TransportSession msg, Version, SessionId, QueueId, msg)
 
 data HostMode
   = -- | prefer (or require) onion hosts when connecting via SOCKS proxy
@@ -152,14 +162,18 @@ data NetworkConfig = NetworkConfig
     hostMode :: HostMode,
     -- | if above criteria is not met, if the below setting is True return error, otherwise use the first host
     requiredHostMode :: Bool,
+    -- | transport sessions are created per user or per entity
+    sessionMode :: TransportSessionMode,
     -- | timeout for the initial client TCP/TLS connection (microseconds)
     tcpConnectTimeout :: Int,
     -- | timeout of protocol commands (microseconds)
     tcpTimeout :: Int,
     -- | TCP keep-alive options, Nothing to skip enabling keep-alive
     tcpKeepAlive :: Maybe KeepAliveOpts,
-    -- | period for SMP ping commands (microseconds)
-    smpPingInterval :: Int,
+    -- | period for SMP ping commands (microseconds, 0 to disable)
+    smpPingInterval :: Int64,
+    -- | the count of PING errors after which SMP client terminates (and will be reconnected), 0 to disable
+    smpPingCount :: Int,
     logTLSErrors :: Bool
   }
   deriving (Eq, Show, Generic, FromJSON)
@@ -168,16 +182,28 @@ instance ToJSON NetworkConfig where
   toJSON = J.genericToJSON J.defaultOptions {J.omitNothingFields = True}
   toEncoding = J.genericToEncoding J.defaultOptions {J.omitNothingFields = True}
 
+data TransportSessionMode = TSMUser | TSMEntity
+  deriving (Eq, Show, Generic)
+
+instance ToJSON TransportSessionMode where
+  toJSON = J.genericToJSON . enumJSON $ dropPrefix "TSM"
+  toEncoding = J.genericToEncoding . enumJSON $ dropPrefix "TSM"
+
+instance FromJSON TransportSessionMode where
+  parseJSON = J.genericParseJSON . enumJSON $ dropPrefix "TSM"
+
 defaultNetworkConfig :: NetworkConfig
 defaultNetworkConfig =
   NetworkConfig
     { socksProxy = Nothing,
       hostMode = HMOnionViaSocks,
       requiredHostMode = False,
+      sessionMode = TSMUser,
       tcpConnectTimeout = 7_500_000,
       tcpTimeout = 5_000_000,
       tcpKeepAlive = Just defaultKeepAliveOpts,
       smpPingInterval = 600_000_000, -- 10min
+      smpPingCount = 3,
       logTLSErrors = False
     }
 
@@ -193,8 +219,10 @@ data ProtocolClientConfig = ProtocolClientConfig
     defaultTransport :: (ServiceName, ATransport),
     -- | network configuration
     networkConfig :: NetworkConfig,
-    -- | SMP client-server protocol version range
-    smpServerVRange :: VersionRange
+    -- | client-server protocol version range
+    serverVRange :: VersionRange,
+    -- | delay between sending batches of commands (microseconds)
+    batchDelay :: Maybe Int
   }
 
 -- | Default protocol client configuration.
@@ -204,17 +232,18 @@ defaultClientConfig =
     { qSize = 64,
       defaultTransport = ("443", transport @TLS),
       networkConfig = defaultNetworkConfig,
-      smpServerVRange = supportedSMPServerVRange
+      serverVRange = supportedSMPServerVRange,
+      batchDelay = Nothing
     }
 
-data Request msg = Request
+data Request err msg = Request
   { queueId :: QueueId,
-    responseVar :: TMVar (Response msg)
+    responseVar :: TMVar (Response err msg)
   }
 
-type Response msg = Either ProtocolClientError msg
+type Response err msg = Either (ProtocolClientError err) msg
 
-chooseTransportHost :: NetworkConfig -> NonEmpty TransportHost -> Either ProtocolClientError TransportHost
+chooseTransportHost :: NetworkConfig -> NonEmpty TransportHost -> Either (ProtocolClientError err) TransportHost
 chooseTransportHost NetworkConfig {socksProxy, hostMode, requiredHostMode} hosts =
   firstOrError $ case hostMode of
     HMOnionViaSocks -> maybe publicHost (const onionHost) socksProxy
@@ -228,29 +257,40 @@ chooseTransportHost NetworkConfig {socksProxy, hostMode, requiredHostMode} hosts
     onionHost = find isOnionHost hosts
     publicHost = find (not . isOnionHost) hosts
 
-clientServer :: ProtocolTypeI (ProtoType msg) => ProtocolClient msg -> String
-clientServer = B.unpack . strEncode . protocolServer . client_
+protocolClientServer :: ProtocolTypeI (ProtoType msg) => ProtocolClient err msg -> String
+protocolClientServer = B.unpack . strEncode . snd3 . transportSession . client_
+  where
+    snd3 (_, s, _) = s
 
-transportHost' :: ProtocolClient msg -> TransportHost
+transportHost' :: ProtocolClient err msg -> TransportHost
 transportHost' = transportHost . client_
 
+transportSession' :: ProtocolClient err msg -> TransportSession msg
+transportSession' = transportSession . client_
+
+type UserId = Int64
+
+-- | Transport session key - includes entity ID if `sessionMode = TSMEntity`.
+type TransportSession msg = (UserId, ProtoServer msg, Maybe EntityId)
+
 -- | 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 msg. Protocol msg => ProtoServer msg -> ProtocolClientConfig -> Maybe (TBQueue (ServerTransmission msg)) -> (ProtocolClient msg -> IO ()) -> IO (Either ProtocolClientError (ProtocolClient msg))
-getProtocolClient protocolServer cfg@ProtocolClientConfig {qSize, networkConfig, smpServerVRange} msgQ disconnected = do
-  case chooseTransportHost networkConfig (host protocolServer) of
+getProtocolClient :: forall err msg. Protocol err msg => TransportSession msg -> ProtocolClientConfig -> Maybe (TBQueue (ServerTransmission msg)) -> (ProtocolClient err msg -> IO ()) -> IO (Either (ProtocolClientError err) (ProtocolClient err msg))
+getProtocolClient transportSession@(_, srv, _) cfg@ProtocolClientConfig {qSize, networkConfig, serverVRange, batchDelay} msgQ disconnected = do
+  case chooseTransportHost networkConfig (host srv) of
     Right useHost ->
       (atomically (mkProtocolClient useHost) >>= runClient useTransport useHost)
         `catch` \(e :: IOException) -> pure . Left $ PCEIOError e
     Left e -> pure $ Left e
   where
     NetworkConfig {tcpConnectTimeout, tcpTimeout, smpPingInterval} = networkConfig
-    mkProtocolClient :: TransportHost -> STM (PClient msg)
+    mkProtocolClient :: TransportHost -> STM (PClient err msg)
     mkProtocolClient transportHost = do
       connected <- newTVar False
+      pingErrorCount <- newTVar 0
       clientCorrId <- newTVar 0
       sentCommands <- TM.empty
       sndQ <- newTBQueue qSize
@@ -258,9 +298,10 @@ getProtocolClient protocolServer cfg@ProtocolClientConfig {qSize, networkConfig,
       return
         PClient
           { connected,
-            protocolServer,
+            transportSession,
             transportHost,
             tcpTimeout,
+            pingErrorCount,
             clientCorrId,
             sentCommands,
             sndQ,
@@ -268,13 +309,14 @@ getProtocolClient protocolServer cfg@ProtocolClientConfig {qSize, networkConfig,
             msgQ
           }
 
-    runClient :: (ServiceName, ATransport) -> TransportHost -> PClient msg -> IO (Either ProtocolClientError (ProtocolClient msg))
+    runClient :: (ServiceName, ATransport) -> TransportHost -> PClient err msg -> IO (Either (ProtocolClientError err) (ProtocolClient err msg))
     runClient (port', ATransport t) useHost c = do
       cVar <- newEmptyTMVarIO
       let tcConfig = transportClientConfig networkConfig
+          username = proxyUsername transportSession
       action <-
         async $
-          runTransportClient tcConfig useHost port' (Just $ keyHash protocolServer) (client t c cVar)
+          runTransportClient tcConfig (Just username) useHost port' (Just $ keyHash srv) (client t c cVar)
             `finally` atomically (putTMVar cVar $ Left PCENetworkError)
       c_ <- tcpConnectTimeout `timeout` atomically (takeTMVar cVar)
       pure $ case c_ of
@@ -283,14 +325,14 @@ getProtocolClient protocolServer cfg@ProtocolClientConfig {qSize, networkConfig,
         Nothing -> Left PCENetworkError
 
     useTransport :: (ServiceName, ATransport)
-    useTransport = case port protocolServer of
+    useTransport = case port srv of
       "" -> defaultTransport cfg
       "80" -> ("80", transport @WS)
       p -> (p, transport @TLS)
 
-    client :: forall c. Transport c => TProxy c -> PClient msg -> TMVar (Either ProtocolClientError (ProtocolClient msg)) -> c -> IO ()
+    client :: forall c. Transport c => TProxy c -> PClient err msg -> TMVar (Either (ProtocolClientError err) (ProtocolClient err msg)) -> c -> IO ()
     client _ c cVar h =
-      runExceptT (protocolClientHandshake @msg h (keyHash protocolServer) smpServerVRange) >>= \case
+      runExceptT (protocolClientHandshake @err @msg h (keyHash srv) serverVRange) >>= \case
         Left e -> atomically . putTMVar cVar . Left $ PCETransportError e
         Right th@THandle {sessionId, thVersion} -> do
           sessionTs <- getCurrentTime
@@ -301,21 +343,27 @@ getProtocolClient protocolServer cfg@ProtocolClientConfig {qSize, networkConfig,
           raceAny_ ([send c' th, process c', receive c' th] <> [ping c' | smpPingInterval > 0])
             `finally` disconnected c'
 
-    send :: Transport c => ProtocolClient msg -> THandle c -> IO ()
-    send ProtocolClient {client_ = PClient {sndQ}} h = forever $ atomically (readTBQueue sndQ) >>= tPut h
+    send :: Transport c => ProtocolClient err msg -> THandle c -> IO ()
+    send ProtocolClient {client_ = PClient {sndQ}} h = forever $ atomically (readTBQueue sndQ) >>= tPut h batchDelay
 
-    receive :: Transport c => ProtocolClient msg -> THandle c -> IO ()
+    receive :: Transport c => ProtocolClient err msg -> THandle c -> IO ()
     receive ProtocolClient {client_ = PClient {rcvQ}} h = forever $ tGet h >>= atomically . writeTBQueue rcvQ
 
-    ping :: ProtocolClient msg -> IO ()
-    ping c = forever $ do
-      threadDelay smpPingInterval
-      runExceptT $ sendProtocolCommand c Nothing "" protocolPing
+    ping :: ProtocolClient err msg -> IO ()
+    ping c@ProtocolClient {client_ = PClient {pingErrorCount}} = do
+      threadDelay' smpPingInterval
+      runExceptT (sendProtocolCommand c Nothing "" $ protocolPing @err @msg) >>= \case
+        Left PCEResponseTimeout -> do
+          cnt <- atomically $ stateTVar pingErrorCount $ \cnt -> (cnt + 1, cnt + 1)
+          when (maxCnt == 0 || cnt < maxCnt) $ ping c
+        _ -> ping c -- sendProtocolCommand resets pingErrorCount
+      where
+        maxCnt = smpPingCount networkConfig
 
-    process :: ProtocolClient msg -> IO ()
+    process :: ProtocolClient err msg -> IO ()
     process c = forever $ atomically (readTBQueue $ rcvQ $ client_ c) >>= mapM_ (processMsg c)
 
-    processMsg :: ProtocolClient msg -> SignedTransmission msg -> IO ()
+    processMsg :: ProtocolClient err msg -> SignedTransmission err msg -> IO ()
     processMsg c@ProtocolClient {client_ = PClient {sentCommands}} (_, _, (corrId, qId, respOrErr)) =
       if B.null $ bs corrId
         then sendMsg respOrErr
@@ -333,23 +381,26 @@ getProtocolClient protocolServer cfg@ProtocolClientConfig {qSize, networkConfig,
                       _ -> Right r
                   else Left . PCEUnexpectedResponse $ bshow respOrErr
       where
-        sendMsg :: Either ErrorType msg -> IO ()
+        sendMsg :: Either err msg -> IO ()
         sendMsg = \case
           Right msg -> atomically $ mapM_ (`writeTBQueue` serverTransmission c qId msg) msgQ
           Left e -> putStrLn $ "SMP client error: " <> show e
 
+proxyUsername :: TransportSession msg -> ByteString
+proxyUsername (userId, _, entityId_) = C.sha256Hash $ bshow userId <> maybe "" (":" <>) entityId_
+
 -- | Disconnects client from the server and terminates client threads.
-closeProtocolClient :: ProtocolClient msg -> IO ()
+closeProtocolClient :: ProtocolClient err msg -> IO ()
 closeProtocolClient = mapM_ uninterruptibleCancel . action
 
 -- | SMP client error type.
-data ProtocolClientError
+data ProtocolClientError err
   = -- | Correctly parsed SMP server ERR response.
     -- This error is forwarded to the agent client as `ERR SMP err`.
-    PCEProtocolError ErrorType
+    PCEProtocolError err
   | -- | Invalid server response that failed to parse.
     -- Forwarded to the agent client as `ERR BROKER RESPONSE`.
-    PCEResponseError ErrorType
+    PCEResponseError err
   | -- | Different response from what is expected to a certain SMP command,
     -- e.g. server should respond `IDS` or `ERR` to `NEW` command,
     -- other responses would result in this error.
@@ -366,12 +417,21 @@ data ProtocolClientError
   | -- | TCP transport handshake or some other transport error.
     -- Forwarded to the agent client as `ERR BROKER TRANSPORT e`.
     PCETransportError TransportError
-  | -- | Error when cryptographically "signing" the command.
-    PCESignatureError C.CryptoError
+  | -- | Error when cryptographically "signing" the command or when initializing crypto_box.
+    PCECryptoError C.CryptoError
   | -- | IO Error
     PCEIOError IOException
   deriving (Eq, Show, Exception)
 
+type SMPClientError = ProtocolClientError ErrorType
+
+temporaryClientError :: ProtocolClientError err -> Bool
+temporaryClientError = \case
+  PCENetworkError -> True
+  PCEResponseTimeout -> True
+  PCEIOError _ -> True
+  _ -> False
+
 -- | Create a new SMP queue.
 --
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#create-queue-command
@@ -381,7 +441,7 @@ createSMPQueue ::
   RcvPublicVerifyKey ->
   RcvPublicDhKey ->
   Maybe BasicAuth ->
-  ExceptT ProtocolClientError IO QueueIdsKeys
+  ExceptT SMPClientError IO QueueIdsKeys
 createSMPQueue c rpKey rKey dhKey auth =
   sendSMPCommand c (Just rpKey) "" (NEW rKey dhKey auth) >>= \case
     IDS qik -> pure qik
@@ -390,7 +450,7 @@ createSMPQueue c rpKey rKey dhKey auth =
 -- | Subscribe to the SMP queue.
 --
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#subscribe-to-queue
-subscribeSMPQueue :: SMPClient -> RcvPrivateSignKey -> RecipientId -> ExceptT ProtocolClientError IO ()
+subscribeSMPQueue :: SMPClient -> RcvPrivateSignKey -> RecipientId -> ExceptT SMPClientError IO ()
 subscribeSMPQueue c rpKey rId =
   sendSMPCommand c (Just rpKey) rId SUB >>= \case
     OK -> return ()
@@ -398,7 +458,7 @@ subscribeSMPQueue c rpKey rId =
     r -> throwE . PCEUnexpectedResponse $ bshow r
 
 -- | Subscribe to multiple SMP queues batching commands if supported.
-subscribeSMPQueues :: SMPClient -> NonEmpty (RcvPrivateSignKey, RecipientId) -> IO (NonEmpty (Either ProtocolClientError ()))
+subscribeSMPQueues :: SMPClient -> NonEmpty (RcvPrivateSignKey, RecipientId) -> IO (NonEmpty (Either SMPClientError ()))
 subscribeSMPQueues c qs = sendProtocolCommands c cs >>= mapM response . L.zip qs
   where
     cs = L.map (\(rpKey, rId) -> (Just rpKey, rId, Cmd SRecipient SUB)) qs
@@ -411,14 +471,14 @@ subscribeSMPQueues c qs = sendProtocolCommands c cs >>= mapM response . L.zip qs
 writeSMPMessage :: SMPClient -> RecipientId -> BrokerMsg -> IO ()
 writeSMPMessage c rId msg = atomically $ mapM_ (`writeTBQueue` serverTransmission c rId msg) (msgQ $ client_ c)
 
-serverTransmission :: ProtocolClient msg -> RecipientId -> msg -> ServerTransmission msg
-serverTransmission ProtocolClient {thVersion, sessionId, client_ = PClient {protocolServer}} entityId message =
-  (protocolServer, thVersion, sessionId, entityId, message)
+serverTransmission :: ProtocolClient err msg -> RecipientId -> msg -> ServerTransmission msg
+serverTransmission ProtocolClient {thVersion, sessionId, client_ = PClient {transportSession}} entityId message =
+  (transportSession, thVersion, sessionId, entityId, message)
 
 -- | Get message from SMP queue. The server returns ERR PROHIBITED if a client uses SUB and GET via the same transport connection for the same queue
 --
 -- https://github.covm/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#receive-a-message-from-the-queue
-getSMPMessage :: SMPClient -> RcvPrivateSignKey -> RecipientId -> ExceptT ProtocolClientError IO (Maybe RcvMessage)
+getSMPMessage :: SMPClient -> RcvPrivateSignKey -> RecipientId -> ExceptT SMPClientError IO (Maybe RcvMessage)
 getSMPMessage c rpKey rId =
   sendSMPCommand c (Just rpKey) rId GET >>= \case
     OK -> pure Nothing
@@ -428,26 +488,36 @@ getSMPMessage c rpKey rId =
 -- | Subscribe to the SMP queue notifications.
 --
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#subscribe-to-queue-notifications
-subscribeSMPQueueNotifications :: SMPClient -> NtfPrivateSignKey -> NotifierId -> ExceptT ProtocolClientError IO ()
+subscribeSMPQueueNotifications :: SMPClient -> NtfPrivateSignKey -> NotifierId -> ExceptT SMPClientError IO ()
 subscribeSMPQueueNotifications = okSMPCommand NSUB
 
+-- | Subscribe to multiple SMP queues notifications batching commands if supported.
+subscribeSMPQueuesNtfs :: SMPClient -> NonEmpty (NtfPrivateSignKey, NotifierId) -> IO (NonEmpty (Either SMPClientError ()))
+subscribeSMPQueuesNtfs c qs = sendProtocolCommands c cs >>= mapM response
+  where
+    cs = L.map (\(npKey, nId) -> (Just npKey, nId, Cmd SNotifier NSUB)) qs
+    response r = pure $ case r of
+      Right OK -> Right ()
+      Right r' -> Left . PCEUnexpectedResponse $ bshow r'
+      Left e -> Left e
+
 -- | 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
-secureSMPQueue :: SMPClient -> RcvPrivateSignKey -> RecipientId -> SndPublicVerifyKey -> ExceptT ProtocolClientError IO ()
+secureSMPQueue :: SMPClient -> RcvPrivateSignKey -> RecipientId -> SndPublicVerifyKey -> ExceptT SMPClientError IO ()
 secureSMPQueue c rpKey rId senderKey = okSMPCommand (KEY senderKey) c rpKey rId
 
 -- | Enable notifications for the queue for push notifications server.
 --
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#enable-notifications-command
-enableSMPQueueNotifications :: SMPClient -> RcvPrivateSignKey -> RecipientId -> NtfPublicVerifyKey -> RcvNtfPublicDhKey -> ExceptT ProtocolClientError IO (NotifierId, RcvNtfPublicDhKey)
+enableSMPQueueNotifications :: SMPClient -> RcvPrivateSignKey -> RecipientId -> NtfPublicVerifyKey -> RcvNtfPublicDhKey -> ExceptT SMPClientError IO (NotifierId, RcvNtfPublicDhKey)
 enableSMPQueueNotifications c rpKey rId notifierKey rcvNtfPublicDhKey =
   sendSMPCommand c (Just rpKey) rId (NKEY notifierKey rcvNtfPublicDhKey) >>= \case
     NID nId rcvNtfSrvPublicDhKey -> pure (nId, rcvNtfSrvPublicDhKey)
     r -> throwE . PCEUnexpectedResponse $ bshow r
 
 -- | Enable notifications for the multiple queues for push notifications server.
-enableSMPQueuesNtfs :: SMPClient -> NonEmpty (RcvPrivateSignKey, RecipientId, NtfPublicVerifyKey, RcvNtfPublicDhKey) -> IO (NonEmpty (Either ProtocolClientError (NotifierId, RcvNtfPublicDhKey)))
+enableSMPQueuesNtfs :: SMPClient -> NonEmpty (RcvPrivateSignKey, RecipientId, NtfPublicVerifyKey, RcvNtfPublicDhKey) -> IO (NonEmpty (Either SMPClientError (NotifierId, RcvNtfPublicDhKey)))
 enableSMPQueuesNtfs c qs = L.map response <$> sendProtocolCommands c cs
   where
     cs = L.map (\(rpKey, rId, notifierKey, rcvNtfPublicDhKey) -> (Just rpKey, rId, Cmd SRecipient $ NKEY notifierKey rcvNtfPublicDhKey)) qs
@@ -459,23 +529,17 @@ enableSMPQueuesNtfs c qs = L.map response <$> sendProtocolCommands c cs
 -- | Disable notifications for the queue for push notifications server.
 --
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#disable-notifications-command
-disableSMPQueueNotifications :: SMPClient -> RcvPrivateSignKey -> RecipientId -> ExceptT ProtocolClientError IO ()
+disableSMPQueueNotifications :: SMPClient -> RcvPrivateSignKey -> RecipientId -> ExceptT SMPClientError IO ()
 disableSMPQueueNotifications = okSMPCommand NDEL
 
 -- | Disable notifications for multiple queues for push notifications server.
-disableSMPQueuesNtfs :: SMPClient -> NonEmpty (RcvPrivateSignKey, RecipientId) -> IO (NonEmpty (Either ProtocolClientError ()))
-disableSMPQueuesNtfs c qs = L.map response <$> sendProtocolCommands c cs
-  where
-    cs = L.map (\(rpKey, rId) -> (Just rpKey, rId, Cmd SRecipient NDEL)) qs
-    response = \case
-      Right OK -> Right ()
-      Right r -> Left . PCEUnexpectedResponse $ bshow r
-      Left e -> Left e
+disableSMPQueuesNtfs :: SMPClient -> NonEmpty (RcvPrivateSignKey, RecipientId) -> IO (NonEmpty (Either SMPClientError ()))
+disableSMPQueuesNtfs = okSMPCommands NDEL
 
 -- | Send SMP message.
 --
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#send-message
-sendSMPMessage :: SMPClient -> Maybe SndPrivateSignKey -> SenderId -> MsgFlags -> MsgBody -> ExceptT ProtocolClientError IO ()
+sendSMPMessage :: SMPClient -> Maybe SndPrivateSignKey -> SenderId -> MsgFlags -> MsgBody -> ExceptT SMPClientError IO ()
 sendSMPMessage c spKey sId flags msg =
   sendSMPCommand c spKey sId (SEND flags msg) >>= \case
     OK -> pure ()
@@ -484,7 +548,7 @@ sendSMPMessage c spKey sId flags msg =
 -- | Acknowledge message delivery (server deletes the message).
 --
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#acknowledge-message-delivery
-ackSMPMessage :: SMPClient -> RcvPrivateSignKey -> QueueId -> MsgId -> ExceptT ProtocolClientError IO ()
+ackSMPMessage :: SMPClient -> RcvPrivateSignKey -> QueueId -> MsgId -> ExceptT SMPClientError IO ()
 ackSMPMessage c rpKey rId msgId =
   sendSMPCommand c (Just rpKey) rId (ACK msgId) >>= \case
     OK -> return ()
@@ -495,49 +559,65 @@ ackSMPMessage c rpKey rId msgId =
 -- The existing messages from the queue will still be delivered.
 --
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#suspend-queue
-suspendSMPQueue :: SMPClient -> RcvPrivateSignKey -> QueueId -> ExceptT ProtocolClientError IO ()
+suspendSMPQueue :: SMPClient -> RcvPrivateSignKey -> QueueId -> ExceptT SMPClientError IO ()
 suspendSMPQueue = okSMPCommand OFF
 
 -- | Irreversibly delete SMP queue and all messages in it.
 --
 -- https://github.com/simplex-chat/simplexmq/blob/master/protocol/simplex-messaging.md#delete-queue
-deleteSMPQueue :: SMPClient -> RcvPrivateSignKey -> QueueId -> ExceptT ProtocolClientError IO ()
+deleteSMPQueue :: SMPClient -> RcvPrivateSignKey -> RecipientId -> ExceptT SMPClientError IO ()
 deleteSMPQueue = okSMPCommand DEL
 
-okSMPCommand :: PartyI p => Command p -> SMPClient -> C.APrivateSignKey -> QueueId -> ExceptT ProtocolClientError IO ()
+-- | Delete multiple SMP queues batching commands if supported.
+deleteSMPQueues :: SMPClient -> NonEmpty (RcvPrivateSignKey, RecipientId) -> IO (NonEmpty (Either SMPClientError ()))
+deleteSMPQueues = okSMPCommands DEL
+
+okSMPCommand :: PartyI p => Command p -> SMPClient -> C.APrivateSignKey -> QueueId -> ExceptT SMPClientError IO ()
 okSMPCommand cmd c pKey qId =
   sendSMPCommand c (Just pKey) qId cmd >>= \case
     OK -> return ()
     r -> throwE . PCEUnexpectedResponse $ bshow r
 
+okSMPCommands :: PartyI p => Command p -> SMPClient -> NonEmpty (C.APrivateSignKey, QueueId) -> IO (NonEmpty (Either SMPClientError ()))
+okSMPCommands cmd c qs = L.map response <$> sendProtocolCommands c cs
+  where
+    aCmd = Cmd sParty cmd
+    cs = L.map (\(pKey, qId) -> (Just pKey, qId, aCmd)) qs
+    response = \case
+      Right OK -> Right ()
+      Right r -> Left . PCEUnexpectedResponse $ bshow r
+      Left e -> Left e
+
 -- | Send SMP command
-sendSMPCommand :: PartyI p => SMPClient -> Maybe C.APrivateSignKey -> QueueId -> Command p -> ExceptT ProtocolClientError IO BrokerMsg
+sendSMPCommand :: PartyI p => SMPClient -> Maybe C.APrivateSignKey -> QueueId -> Command p -> ExceptT SMPClientError IO BrokerMsg
 sendSMPCommand c pKey qId cmd = sendProtocolCommand c pKey qId (Cmd sParty cmd)
 
 -- | Send multiple commands with batching and collect responses
-sendProtocolCommands :: forall msg. ProtocolEncoding (ProtoCommand msg) => ProtocolClient msg -> NonEmpty (ClientCommand msg) -> IO (NonEmpty (Either ProtocolClientError msg))
-sendProtocolCommands c@ProtocolClient {client_ = PClient {sndQ, tcpTimeout}} cs = do
+sendProtocolCommands :: forall err msg. ProtocolEncoding err (ProtoCommand msg) => ProtocolClient err msg -> NonEmpty (ClientCommand msg) -> IO (NonEmpty (Either (ProtocolClientError err) msg))
+sendProtocolCommands c@ProtocolClient {client_ = PClient {sndQ}} cs = do
   ts <- mapM (runExceptT . mkTransmission c) cs
   mapM_ (atomically . writeTBQueue sndQ . L.map fst) . L.nonEmpty . rights $ L.toList ts
   forConcurrently ts $ \case
-    Right (_, r) -> withTimeout . atomically $ takeTMVar r
+    Right (_, r) -> withTimeout c $ atomically $ takeTMVar r
     Left e -> pure $ Left e
-  where
-    withTimeout a = fromMaybe (Left PCEResponseTimeout) <$> timeout tcpTimeout a
 
 -- | Send Protocol command
-sendProtocolCommand :: forall msg. ProtocolEncoding (ProtoCommand msg) => ProtocolClient msg -> Maybe C.APrivateSignKey -> QueueId -> ProtoCommand msg -> ExceptT ProtocolClientError IO msg
-sendProtocolCommand c@ProtocolClient {client_ = PClient {sndQ, tcpTimeout}} pKey qId cmd = do
+sendProtocolCommand :: forall err msg. ProtocolEncoding err (ProtoCommand msg) => ProtocolClient err msg -> Maybe C.APrivateSignKey -> QueueId -> ProtoCommand msg -> ExceptT (ProtocolClientError err) IO msg
+sendProtocolCommand c@ProtocolClient {client_ = PClient {sndQ}} pKey qId cmd = do
   (t, r) <- mkTransmission c (pKey, qId, cmd)
   ExceptT $ sendRecv t r
   where
     -- two separate "atomically" needed to avoid blocking
-    sendRecv :: SentRawTransmission -> TMVar (Response msg) -> IO (Response msg)
-    sendRecv t r = atomically (writeTBQueue sndQ [t]) >> withTimeout (atomically $ takeTMVar r)
-      where
-        withTimeout a = fromMaybe (Left PCEResponseTimeout) <$> timeout tcpTimeout a
+    sendRecv :: SentRawTransmission -> TMVar (Response err msg) -> IO (Response err msg)
+    sendRecv t r = atomically (writeTBQueue sndQ [t]) >> withTimeout c (atomically $ takeTMVar r)
 
-mkTransmission :: forall msg. ProtocolEncoding (ProtoCommand msg) => ProtocolClient msg -> ClientCommand msg -> ExceptT ProtocolClientError IO (SentRawTransmission, TMVar (Response msg))
+withTimeout :: ProtocolClient err msg -> IO (Either (ProtocolClientError err) msg) -> IO (Either (ProtocolClientError err) msg)
+withTimeout ProtocolClient {client_ = PClient {tcpTimeout, pingErrorCount}} a =
+  timeout tcpTimeout a >>= \case
+    Just r -> atomically (writeTVar pingErrorCount 0) >> pure r
+    _ -> pure $ Left PCEResponseTimeout
+
+mkTransmission :: forall err msg. ProtocolEncoding err (ProtoCommand msg) => ProtocolClient err msg -> ClientCommand msg -> ExceptT (ProtocolClientError err) IO (SentRawTransmission, TMVar (Response err msg))
 mkTransmission ProtocolClient {sessionId, thVersion, client_ = PClient {clientCorrId, sentCommands}} (pKey, qId, cmd) = do
   corrId <- liftIO $ atomically getNextCorrId
   let t = signTransmission $ encodeTransmission thVersion sessionId (corrId, qId, cmd)
@@ -550,7 +630,7 @@ mkTransmission ProtocolClient {sessionId, thVersion, client_ = PClient {clientCo
       pure . CorrId $ bshow i
     signTransmission :: ByteString -> SentRawTransmission
     signTransmission t = ((`C.sign` t) <$> pKey, t)
-    mkRequest :: CorrId -> STM (TMVar (Response msg))
+    mkRequest :: CorrId -> STM (TMVar (Response err msg))
     mkRequest corrId = do
       r <- newEmptyTMVar
       TM.insert corrId (Request qId r) sentCommands

src/Simplex/Messaging/Client/Agent.hs

@@ -5,6 +5,7 @@
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE RankNTypes #-}
 {-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE TupleSections #-}
 {-# LANGUAGE TypeApplications #-}
 {-# OPTIONS_GHC -fno-warn-orphans #-}
 
@@ -16,36 +17,43 @@ import Control.Logger.Simple
 import Control.Monad.Except
 import Control.Monad.IO.Unlift
 import Control.Monad.Trans.Except
+import Data.Bifunctor (first, bimap)
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
+import Data.Either (partitionEithers)
+import Data.List (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 (listToMaybe)
 import Data.Set (Set)
 import Data.Text.Encoding
+import Data.Tuple (swap)
 import Numeric.Natural
 import Simplex.Messaging.Agent.RetryInterval
 import Simplex.Messaging.Client
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Encoding.String
-import Simplex.Messaging.Protocol (BrokerMsg, ProtocolServer (..), QueueId, SMPServer)
+import Simplex.Messaging.Protocol (BrokerMsg, ProtocolServer (..), QueueId, SMPServer, NtfPrivateSignKey, NotifierId, RcvPrivateSignKey, RecipientId)
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
 import Simplex.Messaging.Transport
-import Simplex.Messaging.Util (catchAll_, tryE, unlessM, ($>>=))
+import Simplex.Messaging.Util (catchAll_, tryE, ($>>=))
 import System.Timeout (timeout)
-import UnliftIO (async, forConcurrently_)
+import UnliftIO (async)
 import UnliftIO.Exception (Exception)
 import qualified UnliftIO.Exception as E
 import UnliftIO.STM
 
-type SMPClientVar = TMVar (Either ProtocolClientError SMPClient)
+type SMPClientVar = TMVar (Either SMPClientError SMPClient)
 
 data SMPClientAgentEvent
   = CAConnected SMPServer
   | CADisconnected SMPServer (Set SMPSub)
   | CAReconnected SMPServer
-  | CAResubscribed SMPServer SMPSub
-  | CASubError SMPServer SMPSub ProtocolClientError
+  | CAResubscribed SMPServer (NonEmpty SMPSub)
+  | CASubError SMPServer (NonEmpty (SMPSub, SMPClientError))
 
 data SMPSubParty = SPRecipient | SPNotifier
   deriving (Eq, Ord, Show)
@@ -111,7 +119,7 @@ newSMPClientAgent agentCfg@SMPClientAgentConfig {msgQSize, agentQSize} = do
   asyncClients <- newTVar []
   pure SMPClientAgent {agentCfg, msgQ, agentQ, smpClients, srvSubs, pendingSrvSubs, reconnections, asyncClients}
 
-getSMPServerClient' :: SMPClientAgent -> SMPServer -> ExceptT ProtocolClientError IO SMPClient
+getSMPServerClient' :: SMPClientAgent -> SMPServer -> ExceptT SMPClientError IO SMPClient
 getSMPServerClient' ca@SMPClientAgent {agentCfg, smpClients, msgQ} srv =
   atomically getClientVar >>= either newSMPClient waitForSMPClient
   where
@@ -124,7 +132,7 @@ getSMPServerClient' ca@SMPClientAgent {agentCfg, smpClients, msgQ} srv =
       TM.insert srv smpVar smpClients
       pure smpVar
 
-    waitForSMPClient :: SMPClientVar -> ExceptT ProtocolClientError IO SMPClient
+    waitForSMPClient :: SMPClientVar -> ExceptT SMPClientError IO SMPClient
     waitForSMPClient smpVar = do
       let ProtocolClientConfig {networkConfig = NetworkConfig {tcpConnectTimeout}} = smpCfg agentCfg
       smpClient_ <- liftIO $ tcpConnectTimeout `timeout` atomically (readTMVar smpVar)
@@ -133,10 +141,10 @@ getSMPServerClient' ca@SMPClientAgent {agentCfg, smpClients, msgQ} srv =
         Just (Left e) -> Left e
         Nothing -> Left PCEResponseTimeout
 
-    newSMPClient :: SMPClientVar -> ExceptT ProtocolClientError IO SMPClient
+    newSMPClient :: SMPClientVar -> ExceptT SMPClientError IO SMPClient
     newSMPClient smpVar = tryConnectClient pure tryConnectAsync
       where
-        tryConnectClient :: (SMPClient -> ExceptT ProtocolClientError IO a) -> ExceptT ProtocolClientError IO () -> ExceptT ProtocolClientError IO a
+        tryConnectClient :: (SMPClient -> ExceptT SMPClientError IO a) -> ExceptT SMPClientError IO () -> ExceptT SMPClientError IO a
         tryConnectClient successAction retryAction =
           tryE connectClient >>= \r -> case r of
             Right smp -> do
@@ -150,17 +158,17 @@ getSMPServerClient' ca@SMPClientAgent {agentCfg, smpClients, msgQ} srv =
                   putTMVar smpVar (Left e)
                   TM.delete srv smpClients
               throwE e
-        tryConnectAsync :: ExceptT ProtocolClientError IO ()
+        tryConnectAsync :: ExceptT SMPClientError IO ()
         tryConnectAsync = do
           a <- async connectAsync
           atomically $ modifyTVar' (asyncClients ca) (a :)
-        connectAsync :: ExceptT ProtocolClientError IO ()
+        connectAsync :: ExceptT SMPClientError IO ()
         connectAsync =
-          withRetryInterval (reconnectInterval agentCfg) $ \loop ->
+          withRetryInterval (reconnectInterval agentCfg) $ \_ loop ->
             void $ tryConnectClient (const reconnectClient) loop
 
-    connectClient :: ExceptT ProtocolClientError IO SMPClient
-    connectClient = ExceptT $ getProtocolClient srv (smpCfg agentCfg) (Just msgQ) clientDisconnected
+    connectClient :: ExceptT SMPClientError IO SMPClient
+    connectClient = ExceptT $ getProtocolClient (1, srv, Nothing) (smpCfg agentCfg) (Just msgQ) clientDisconnected
 
     clientDisconnected :: SMPClient -> IO ()
     clientDisconnected _ = do
@@ -184,44 +192,55 @@ getSMPServerClient' ca@SMPClientAgent {agentCfg, smpClients, msgQ} srv =
             _ -> TM.insert srv sVar ps
 
     serverDown :: Map SMPSub C.APrivateSignKey -> IO ()
-    serverDown ss = unless (M.null ss) . void . runExceptT $ do
+    serverDown ss = unless (M.null ss) $ do
       notify . CADisconnected srv $ M.keysSet ss
-      reconnectServer
+      void $ runExceptT reconnectServer
 
-    reconnectServer :: ExceptT ProtocolClientError IO ()
+    reconnectServer :: ExceptT SMPClientError IO ()
     reconnectServer = do
       a <- async tryReconnectClient
       atomically $ modifyTVar' (reconnections ca) (a :)
 
-    tryReconnectClient :: ExceptT ProtocolClientError IO ()
+    tryReconnectClient :: ExceptT SMPClientError IO ()
     tryReconnectClient = do
-      withRetryInterval (reconnectInterval agentCfg) $ \loop ->
+      withRetryInterval (reconnectInterval agentCfg) $ \_ loop ->
         reconnectClient `catchE` const loop
 
-    reconnectClient :: ExceptT ProtocolClientError IO ()
+    reconnectClient :: ExceptT SMPClientError IO ()
     reconnectClient = do
       withSMP ca srv $ \smp -> do
-        notify $ CAReconnected srv
-        cs <- atomically $ mapM readTVar =<< TM.lookup srv (pendingSrvSubs ca)
-        forConcurrently_ (maybe [] M.assocs cs) $ \sub@(s, _) ->
-          unlessM (atomically $ hasSub (srvSubs ca) srv s) $
-            subscribe_ smp sub `catchE` handleError s
+        liftIO $ notify $ CAReconnected srv
+        cs_ <- atomically $ mapM readTVar =<< TM.lookup srv (pendingSrvSubs ca)
+        forM_ cs_ $ \cs -> do
+          subs' <- filterM (fmap not . atomically . hasSub (srvSubs ca) srv . fst) $ M.assocs cs
+          let (nSubs, rSubs) = partition (isNotifier . fst . fst) subs'
+          subscribe_ smp SPNotifier nSubs
+          subscribe_ smp SPRecipient rSubs
       where
-        subscribe_ :: SMPClient -> (SMPSub, C.APrivateSignKey) -> ExceptT ProtocolClientError IO ()
-        subscribe_ smp sub@(s, _) = do
-          smpSubscribe smp sub
-          atomically $ addSubscription ca srv sub
-          notify $ CAResubscribed srv s
+        isNotifier = \case
+          SPNotifier -> True
+          SPRecipient -> False
 
-        handleError :: SMPSub -> ProtocolClientError -> ExceptT ProtocolClientError IO ()
-        handleError s = \case
-          e@PCEResponseTimeout -> throwE e
-          e@PCENetworkError -> throwE e
-          e -> do
-            notify $ CASubError srv s e
-            atomically $ removePendingSubscription ca srv s
+        subscribe_ :: SMPClient -> SMPSubParty -> [(SMPSub, C.APrivateSignKey)] -> ExceptT SMPClientError IO ()
+        subscribe_ smp party subs =
+          case L.nonEmpty subs of
+            Just subs' -> do
+              let subs'' :: (NonEmpty (QueueId, C.APrivateSignKey)) = L.map (first snd) subs'
+              rs <- liftIO $ smpSubscribeQueues party ca smp srv subs''
+              let rs' :: (NonEmpty ((SMPSub, C.APrivateSignKey), Either SMPClientError ())) =
+                    L.zipWith (first . const) subs' rs
+                  rs'' :: [Either (SMPSub, SMPClientError) (SMPSub, C.APrivateSignKey)] =
+                    map (\(sub, r) -> bimap (fst sub,) (const sub) r) $ L.toList rs'
+                  (errs, oks) = partitionEithers rs''
+                  (tempErrs, finalErrs) = partition (temporaryClientError . snd) errs
+              mapM_ (atomically . addSubscription ca srv) oks
+              mapM_ (liftIO . notify . CAResubscribed srv) $ L.nonEmpty $ map fst oks
+              mapM_ (atomically . removePendingSubscription ca srv . fst) finalErrs 
+              mapM_ (liftIO . notify . CASubError srv) $ L.nonEmpty finalErrs
+              mapM_ (throwE . snd) $ listToMaybe tempErrs
+            Nothing -> pure ()
 
-    notify :: SMPClientAgentEvent -> ExceptT ProtocolClientError IO ()
+    notify :: SMPClientAgentEvent -> IO ()
     notify evt = atomically $ writeTBQueue (agentQ ca) evt
 
 closeSMPClientAgent :: MonadUnliftIO m => SMPClientAgent -> m ()
@@ -241,15 +260,15 @@ closeSMPServerClients c = readTVarIO (smpClients c) >>= mapM_ (forkIO . closeCli
 cancelActions :: Foldable f => TVar (f (Async ())) -> IO ()
 cancelActions as = readTVarIO as >>= mapM_ uninterruptibleCancel
 
-withSMP :: SMPClientAgent -> SMPServer -> (SMPClient -> ExceptT ProtocolClientError IO a) -> ExceptT ProtocolClientError IO a
+withSMP :: SMPClientAgent -> SMPServer -> (SMPClient -> ExceptT SMPClientError IO a) -> ExceptT SMPClientError IO a
 withSMP ca srv action = (getSMPServerClient' ca srv >>= action) `catchE` logSMPError
   where
-    logSMPError :: ProtocolClientError -> ExceptT ProtocolClientError IO a
+    logSMPError :: SMPClientError -> ExceptT SMPClientError IO a
     logSMPError e = do
       liftIO $ putStrLn $ "SMP error (" <> show srv <> "): " <> show e
       throwE e
 
-subscribeQueue :: SMPClientAgent -> SMPServer -> (SMPSub, C.APrivateSignKey) -> ExceptT ProtocolClientError IO ()
+subscribeQueue :: SMPClientAgent -> SMPServer -> (SMPSub, C.APrivateSignKey) -> ExceptT SMPClientError IO ()
 subscribeQueue ca srv sub = do
   atomically $ addPendingSubscription ca srv sub
   withSMP ca srv $ \smp -> subscribe_ smp `catchE` handleError
@@ -263,11 +282,40 @@ subscribeQueue ca srv sub = do
         removePendingSubscription ca srv $ fst sub
       throwE e
 
+subscribeQueuesSMP :: SMPClientAgent -> SMPServer -> NonEmpty (RecipientId, RcvPrivateSignKey) -> IO (NonEmpty (RecipientId, Either SMPClientError ()))
+subscribeQueuesSMP = subscribeQueues_ SPRecipient
+
+subscribeQueuesNtfs :: SMPClientAgent -> SMPServer -> NonEmpty (NotifierId, NtfPrivateSignKey) -> IO (NonEmpty (NotifierId, Either SMPClientError ()))
+subscribeQueuesNtfs = subscribeQueues_ SPNotifier
+
+subscribeQueues_ :: SMPSubParty -> SMPClientAgent -> SMPServer -> NonEmpty (QueueId, C.APrivateSignKey) -> IO (NonEmpty (QueueId, Either SMPClientError ()))
+subscribeQueues_ party ca srv subs = do
+  atomically $ forM_ subs $ addPendingSubscription ca srv . first (party,)
+  runExceptT (getSMPServerClient' ca srv) >>= \case
+    Left e -> pure $ L.map ((,Left e) . fst) subs
+    Right smp -> smpSubscribeQueues party ca smp srv subs
+
+smpSubscribeQueues :: SMPSubParty -> SMPClientAgent -> SMPClient -> SMPServer -> NonEmpty (QueueId, C.APrivateSignKey) -> IO (NonEmpty (QueueId, Either SMPClientError ()))
+smpSubscribeQueues party ca smp srv subs = do
+  rs <- L.zip subs <$> subscribe smp (L.map swap subs)
+  atomically $ forM rs $ \(sub, r) -> (fst sub,) <$> case r of
+    Right () -> do
+      addSubscription ca srv $ first (party,) sub
+      pure $ Right ()
+    Left e -> do
+      when (e /= PCENetworkError && e /= PCEResponseTimeout) $
+        removePendingSubscription ca srv $ (party,) $ fst sub
+      pure $ Left e
+  where
+    subscribe = case party of
+      SPRecipient -> subscribeSMPQueues
+      SPNotifier -> subscribeSMPQueuesNtfs
+
 showServer :: SMPServer -> ByteString
 showServer ProtocolServer {host, port} =
   strEncode host <> B.pack (if null port then "" else ':' : port)
 
-smpSubscribe :: SMPClient -> (SMPSub, C.APrivateSignKey) -> ExceptT ProtocolClientError IO ()
+smpSubscribe :: SMPClient -> (SMPSub, C.APrivateSignKey) -> ExceptT SMPClientError IO ()
 smpSubscribe smp ((party, queueId), privKey) = subscribe_ smp privKey queueId
   where
     subscribe_ = case party of

src/Simplex/Messaging/Crypto.hs

@@ -91,18 +91,23 @@ module Simplex.Messaging.Crypto
     -- * AES256 AEAD-GCM scheme
     Key (..),
     IV (..),
+    GCMIV (unGCMIV), -- constructor is not exported
     AuthTag (..),
-    encryptAES,
-    decryptAES,
     encryptAEAD,
     decryptAEAD,
+    encryptAESNoPad,
+    decryptAESNoPad,
     authTagSize,
     randomAesKey,
     randomIV,
+    randomGCMIV,
     ivSize,
+    gcmIVSize,
+    gcmIV,
 
     -- * NaCl crypto_box
     CbNonce (unCbNonce),
+    pattern CbNonce,
     cbEncrypt,
     cbEncryptMaxLenBS,
     cbDecrypt,
@@ -110,11 +115,21 @@ module Simplex.Messaging.Crypto
     randomCbNonce,
     pseudoRandomCbNonce,
 
+    -- * NaCl crypto_secretbox
+    SbKey (unSbKey),
+    pattern SbKey,
+    sbEncrypt,
+    sbDecrypt,
+    sbKey,
+    unsafeSbKey,
+    randomSbKey,
+
     -- * pseudo-random bytes
     pseudoRandomBytes,
 
-    -- * SHA256 hash
+    -- * digests
     sha256Hash,
+    sha512Hash,
 
     -- * Message padding / un-padding
     pad,
@@ -140,7 +155,7 @@ import Crypto.Cipher.AES (AES256)
 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 (..), hash)
+import Crypto.Hash (Digest, SHA256, SHA512, hash)
 import qualified Crypto.MAC.Poly1305 as Poly1305
 import qualified Crypto.PubKey.Curve25519 as X25519
 import qualified Crypto.PubKey.Curve448 as X448
@@ -153,18 +168,19 @@ import Data.ASN1.Types
 import Data.Aeson (FromJSON (..), ToJSON (..))
 import qualified Data.Attoparsec.ByteString.Char8 as A
 import Data.Bifunctor (bimap, first)
+import Data.ByteArray (ByteArrayAccess)
 import qualified Data.ByteArray as BA
 import Data.ByteString.Base64 (decode, encode)
 import qualified Data.ByteString.Base64.URL as U
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
-import Data.ByteString.Internal (c2w, w2c)
 import Data.ByteString.Lazy (fromStrict, toStrict)
 import Data.Constraint (Dict (..))
 import Data.Kind (Constraint, Type)
 import Data.String
 import Data.Type.Equality
 import Data.Typeable (Proxy (Proxy), Typeable)
+import Data.Word (Word32)
 import Data.X509
 import Database.SQLite.Simple.FromField (FromField (..))
 import Database.SQLite.Simple.ToField (ToField (..))
@@ -690,6 +706,8 @@ data CryptoError
     AESDecryptError
   | -- CryptoBox decryption error
     CBDecryptError
+  | -- Poly1305 initialization error
+    CryptoPoly1305Error CE.CryptoError
   | -- | message is larger that allowed padded length minus 2 (to prepend message length)
     -- (or required un-padded length is larger than the message length)
     CryptoLargeMsgError
@@ -702,9 +720,9 @@ data CryptoError
   | -- | header decryption error (could indicate that another key should be tried)
     CERatchetHeader
   | -- | too many skipped messages
-    CERatchetTooManySkipped
+    CERatchetTooManySkipped Word32
   | -- | earlier message number (or, possibly, skipped message that failed to decrypt?)
-    CERatchetEarlierMessage
+    CERatchetEarlierMessage Word32
   | -- | duplicate message number
     CERatchetDuplicateMessage
   deriving (Eq, Show, Exception)
@@ -742,16 +760,32 @@ instance FromJSON Key where
 
 -- | IV bytes newtype.
 newtype IV = IV {unIV :: ByteString}
+  deriving (Eq, Show)
 
 instance Encoding IV where
   smpEncode = unIV
   smpP = IV <$> A.take (ivSize @AES256)
 
+instance ToJSON IV where
+  toJSON = strToJSON . unIV
+  toEncoding = strToJEncoding . unIV
+
+instance FromJSON IV where
+  parseJSON = fmap IV . strParseJSON "IV"
+
+-- | GCMIV bytes newtype.
+newtype GCMIV = GCMIV {unGCMIV :: ByteString}
+
+gcmIV :: ByteString -> Either CryptoError GCMIV
+gcmIV s
+  | B.length s == gcmIVSize = Right $ GCMIV s
+  | otherwise = Left CryptoIVError
+
 newtype AuthTag = AuthTag {unAuthTag :: AES.AuthTag}
 
 instance Encoding AuthTag where
-  smpEncode = B.pack . map w2c . BA.unpack . AES.unAuthTag . unAuthTag
-  smpP = AuthTag . AES.AuthTag . BA.pack . map c2w . B.unpack <$> A.take authTagSize
+  smpEncode = BA.convert . unAuthTag
+  smpP = AuthTag . AES.AuthTag . BA.convert <$> A.take authTagSize
 
 -- | Certificate fingerpint newtype.
 --
@@ -777,35 +811,52 @@ instance FromField KeyHash where fromField = blobFieldDecoder $ parseAll strP
 sha256Hash :: ByteString -> ByteString
 sha256Hash = BA.convert . (hash :: ByteString -> Digest SHA256)
 
--- | AEAD-GCM encryption with empty associated data.
---
--- Used as part of hybrid E2E encryption scheme and for SMP transport blocks encryption.
-encryptAES :: Key -> IV -> Int -> ByteString -> ExceptT CryptoError IO (AuthTag, ByteString)
-encryptAES key iv paddedLen = encryptAEAD key iv paddedLen ""
+-- | SHA512 digest.
+sha512Hash :: ByteString -> ByteString
+sha512Hash = BA.convert . (hash :: ByteString -> Digest SHA512)
 
--- | AEAD-GCM encryption.
+-- | AEAD-GCM encryption with associated data.
 --
--- Used as part of hybrid E2E encryption scheme and for SMP transport blocks encryption.
+-- Used as part of double ratchet encryption.
+-- This function requires 16 bytes IV, it transforms IV in cryptonite_aes_gcm_init here:
+-- https://github.com/haskell-crypto/cryptonite/blob/master/cbits/cryptonite_aes.c
 encryptAEAD :: Key -> IV -> Int -> ByteString -> ByteString -> ExceptT CryptoError IO (AuthTag, ByteString)
 encryptAEAD aesKey ivBytes paddedLen ad msg = do
   aead <- initAEAD @AES256 aesKey ivBytes
   msg' <- liftEither $ pad msg paddedLen
   pure . first AuthTag $ AES.aeadSimpleEncrypt aead ad msg' authTagSize
 
--- | AEAD-GCM decryption with empty associated data.
---
--- Used as part of hybrid E2E encryption scheme and for SMP transport blocks decryption.
-decryptAES :: Key -> IV -> ByteString -> AuthTag -> ExceptT CryptoError IO ByteString
-decryptAES key iv = decryptAEAD key iv ""
+-- Used to encrypt WebRTC frames.
+-- This function requires 12 bytes IV, it does not transform IV.
+encryptAESNoPad :: Key -> GCMIV -> ByteString -> ExceptT CryptoError IO (AuthTag, ByteString)
+encryptAESNoPad key iv = encryptAEADNoPad key iv ""
 
--- | AEAD-GCM decryption.
+encryptAEADNoPad :: Key -> GCMIV -> ByteString -> ByteString -> ExceptT CryptoError IO (AuthTag, ByteString)
+encryptAEADNoPad aesKey ivBytes ad msg = do
+  aead <- initAEADGCM aesKey ivBytes
+  pure . first AuthTag $ AES.aeadSimpleEncrypt aead ad msg authTagSize
+
+-- | AEAD-GCM decryption with associated data.
 --
--- Used as part of hybrid E2E encryption scheme and for SMP transport blocks decryption.
+-- Used as part of double ratchet encryption.
+-- This function requires 16 bytes IV, it transforms IV in cryptonite_aes_gcm_init here:
+-- https://github.com/haskell-crypto/cryptonite/blob/master/cbits/cryptonite_aes.c
+-- To make it compatible with WebCrypto we will need to start using initAEADGCM.
 decryptAEAD :: Key -> IV -> ByteString -> ByteString -> AuthTag -> ExceptT CryptoError IO ByteString
 decryptAEAD aesKey ivBytes ad msg (AuthTag authTag) = do
   aead <- initAEAD @AES256 aesKey ivBytes
   liftEither . unPad =<< maybeError AESDecryptError (AES.aeadSimpleDecrypt aead ad msg authTag)
 
+-- Used to decrypt WebRTC frames.
+-- This function requires 12 bytes IV, it does not transform IV.
+decryptAESNoPad :: Key -> GCMIV -> ByteString -> AuthTag -> ExceptT CryptoError IO ByteString
+decryptAESNoPad key iv = decryptAEADNoPad key iv ""
+
+decryptAEADNoPad :: Key -> GCMIV -> ByteString -> ByteString -> AuthTag -> ExceptT CryptoError IO ByteString
+decryptAEADNoPad aesKey iv ad msg (AuthTag tag) = do
+  aead <- initAEADGCM aesKey iv
+  maybeError AESDecryptError (AES.aeadSimpleDecrypt aead ad msg tag)
+
 maxMsgLen :: Int
 maxMsgLen = 2 ^ (16 :: Int) - 3
 
@@ -860,6 +911,9 @@ appendMaxLenBS (MLBS s1) (MLBS s2) = MLBS $ s1 <> s2
 maxLength :: forall i. KnownNat i => Int
 maxLength = fromIntegral (natVal $ Proxy @i)
 
+-- this function requires 16 bytes IV, it transforms IV in cryptonite_aes_gcm_init here:
+-- https://github.com/haskell-crypto/cryptonite/blob/master/cbits/cryptonite_aes.c
+-- This is used for double ratchet encryption, so to make it compatible with WebCrypto we will need to deprecate it and start using initAEADGCM
 initAEAD :: forall c. AES.BlockCipher c => Key -> IV -> ExceptT CryptoError IO (AES.AEAD c)
 initAEAD (Key aesKey) (IV ivBytes) = do
   iv <- makeIV @c ivBytes
@@ -867,6 +921,12 @@ initAEAD (Key aesKey) (IV ivBytes) = do
     cipher <- AES.cipherInit aesKey
     AES.aeadInit AES.AEAD_GCM cipher iv
 
+-- this function requires 12 bytes IV, it does not transforms IV.
+initAEADGCM :: Key -> GCMIV -> ExceptT CryptoError IO (AES.AEAD AES256)
+initAEADGCM (Key aesKey) (GCMIV ivBytes) = cryptoFailable $ do
+  cipher <- AES.cipherInit aesKey
+  AES.aeadInit AES.AEAD_GCM cipher ivBytes
+
 -- | Random AES256 key.
 randomAesKey :: IO Key
 randomAesKey = Key <$> getRandomBytes aesKeySize
@@ -875,9 +935,15 @@ randomAesKey = Key <$> getRandomBytes aesKeySize
 randomIV :: IO IV
 randomIV = IV <$> getRandomBytes (ivSize @AES256)
 
+randomGCMIV :: IO GCMIV
+randomGCMIV = GCMIV <$> getRandomBytes gcmIVSize
+
 ivSize :: forall c. AES.BlockCipher c => Int
 ivSize = AES.blockSize (undefined :: c)
 
+gcmIVSize :: Int
+gcmIVSize = 12
+
 makeIV :: AES.BlockCipher c => ByteString -> ExceptT CryptoError IO (AES.IV c)
 makeIV bs = maybeError CryptoIVError $ AES.makeIV bs
 
@@ -915,13 +981,20 @@ dh' (PublicKeyX448 k) (PrivateKeyX448 pk _) = DhSecretX448 $ X448.dh k pk
 
 -- | NaCl @crypto_box@ encrypt with a shared DH secret and 192-bit nonce.
 cbEncrypt :: DhSecret X25519 -> CbNonce -> ByteString -> Int -> Either CryptoError ByteString
-cbEncrypt secret (CbNonce nonce) msg paddedLen = cryptoBox secret nonce <$> pad msg paddedLen
+cbEncrypt (DhSecretX25519 secret) = sbEncrypt_ secret
+
+-- | NaCl @secret_box@ encrypt with a symmetric 256-bit key and 192-bit nonce.
+sbEncrypt :: SbKey -> CbNonce -> ByteString -> Int -> Either CryptoError ByteString
+sbEncrypt (SbKey key) = sbEncrypt_ key
+
+sbEncrypt_ :: ByteArrayAccess key => key -> CbNonce -> ByteString -> Int -> Either CryptoError ByteString
+sbEncrypt_ secret (CbNonce nonce) msg paddedLen = cryptoBox secret nonce <$> pad msg paddedLen
 
 -- | NaCl @crypto_box@ encrypt with a shared DH secret and 192-bit nonce.
 cbEncryptMaxLenBS :: KnownNat i => DhSecret X25519 -> CbNonce -> MaxLenBS i -> ByteString
-cbEncryptMaxLenBS secret (CbNonce nonce) = cryptoBox secret nonce . unMaxLenBS . padMaxLenBS
+cbEncryptMaxLenBS (DhSecretX25519 secret) (CbNonce nonce) = cryptoBox secret nonce . unMaxLenBS . padMaxLenBS
 
-cryptoBox :: DhSecret 'X25519 -> ByteString -> ByteString -> ByteString
+cryptoBox :: ByteArrayAccess key => key -> ByteString -> ByteString -> ByteString
 cryptoBox secret nonce s = BA.convert tag <> c
   where
     (rs, c) = xSalsa20 secret nonce s
@@ -929,7 +1002,15 @@ cryptoBox secret nonce s = BA.convert tag <> c
 
 -- | NaCl @crypto_box@ decrypt with a shared DH secret and 192-bit nonce.
 cbDecrypt :: DhSecret X25519 -> CbNonce -> ByteString -> Either CryptoError ByteString
-cbDecrypt secret (CbNonce nonce) packet
+cbDecrypt (DhSecretX25519 secret) = sbDecrypt_ secret
+
+-- | NaCl @secret_box@ decrypt with a symmetric 256-bit key and 192-bit nonce.
+sbDecrypt :: SbKey -> CbNonce -> ByteString -> Either CryptoError ByteString
+sbDecrypt (SbKey key) = sbDecrypt_ key
+
+-- | NaCl @crypto_box@ decrypt with a shared DH secret and 192-bit nonce.
+sbDecrypt_ :: ByteArrayAccess key => key -> CbNonce -> ByteString -> Either CryptoError ByteString
+sbDecrypt_ secret (CbNonce nonce) packet
   | B.length packet < 16 = Left CBDecryptError
   | BA.constEq tag' tag = unPad msg
   | otherwise = Left CBDecryptError
@@ -938,9 +1019,14 @@ cbDecrypt secret (CbNonce nonce) packet
     (rs, msg) = xSalsa20 secret nonce c
     tag = Poly1305.auth rs c
 
-newtype CbNonce = CbNonce {unCbNonce :: ByteString}
+newtype CbNonce = CryptoBoxNonce {unCbNonce :: ByteString}
   deriving (Eq, Show)
 
+pattern CbNonce :: ByteString -> CbNonce
+pattern CbNonce s <- CryptoBoxNonce s
+
+{-# COMPLETE CbNonce #-}
+
 instance StrEncoding CbNonce where
   strEncode (CbNonce s) = strEncode s
   strP = cbNonce <$> strP
@@ -949,37 +1035,74 @@ instance ToJSON CbNonce where
   toJSON = strToJSON
   toEncoding = strToJEncoding
 
+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 = CbNonce s
-  | len > 24 = CbNonce . fst $ B.splitAt 24 s
-  | otherwise = CbNonce $ s <> B.replicate (24 - len) (toEnum 0)
+  | len == 24 = CryptoBoxNonce s
+  | len > 24 = CryptoBoxNonce . fst $ B.splitAt 24 s
+  | otherwise = CryptoBoxNonce $ s <> B.replicate (24 - len) (toEnum 0)
   where
     len = B.length s
 
 randomCbNonce :: IO CbNonce
-randomCbNonce = CbNonce <$> getRandomBytes 24
+randomCbNonce = CryptoBoxNonce <$> getRandomBytes 24
 
 pseudoRandomCbNonce :: TVar ChaChaDRG -> STM CbNonce
-pseudoRandomCbNonce gVar = CbNonce <$> pseudoRandomBytes 24 gVar
+pseudoRandomCbNonce gVar = CryptoBoxNonce <$> pseudoRandomBytes 24 gVar
 
 pseudoRandomBytes :: Int -> TVar ChaChaDRG -> STM ByteString
-pseudoRandomBytes n gVar = do
-  g <- readTVar gVar
-  let (bytes, g') = randomBytesGenerate n g
-  writeTVar gVar g'
-  return bytes
+pseudoRandomBytes n gVar = stateTVar gVar $ randomBytesGenerate n
 
 instance Encoding CbNonce where
   smpEncode = unCbNonce
-  smpP = CbNonce <$> A.take 24
+  smpP = CryptoBoxNonce <$> A.take 24
 
-xSalsa20 :: DhSecret X25519 -> ByteString -> ByteString -> (ByteString, ByteString)
-xSalsa20 (DhSecretX25519 shared) nonce msg = (rs, msg')
+newtype SbKey = SecretBoxKey {unSbKey :: ByteString}
+  deriving (Eq, Show)
+
+pattern SbKey :: ByteString -> SbKey
+pattern SbKey s <- SecretBoxKey s
+
+{-# COMPLETE SbKey #-}
+
+instance StrEncoding SbKey where
+  strEncode (SbKey s) = strEncode s
+  strP = sbKey <$?> strP
+
+instance ToJSON SbKey where
+  toJSON = strToJSON
+  toEncoding = strToJEncoding
+
+instance FromJSON SbKey where
+  parseJSON = strParseJSON "SbKey"
+
+instance FromField SbKey where fromField f = SecretBoxKey <$> 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
+  | otherwise = Left "SbKey: invalid length"
+
+unsafeSbKey :: ByteString -> SbKey
+unsafeSbKey s = either error id $ sbKey s
+
+randomSbKey :: IO SbKey
+randomSbKey = SecretBoxKey <$> getRandomBytes 32
+
+xSalsa20 :: ByteArrayAccess key => key -> ByteString -> ByteString -> (ByteString, ByteString)
+xSalsa20 secret nonce msg = (rs, msg')
   where
     zero = B.replicate 16 $ toEnum 0
     (iv0, iv1) = B.splitAt 8 nonce
-    state0 = XSalsa.initialize 20 shared (zero `B.append` iv0)
+    state0 = XSalsa.initialize 20 secret (zero `B.append` iv0)
     state1 = XSalsa.derive state0 iv1
     (rs, state2) = XSalsa.generate state1 32
     (msg', _) = XSalsa.combine state2 msg

src/Simplex/Messaging/Crypto/Lazy.hs

@@ -0,0 +1,211 @@
+{-# LANGUAGE BangPatterns #-}
+{-# LANGUAGE GADTs #-}
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE PatternSynonyms #-}
+{-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE TupleSections #-}
+
+module Simplex.Messaging.Crypto.Lazy
+  ( sha256Hash,
+    sha512Hash,
+    pad,
+    unPad,
+    splitLen,
+    sbEncrypt,
+    sbDecrypt,
+    sbEncryptTailTag,
+    sbDecryptTailTag,
+    fastReplicate,
+    SbState,
+    cbInit,
+    sbInit,
+    sbEncryptChunk,
+    sbDecryptChunk,
+    sbEncryptChunkLazy,
+    sbDecryptChunkLazy,
+    sbAuth,
+    LazyByteString,
+  )
+where
+
+import qualified Crypto.Cipher.XSalsa as XSalsa
+import qualified Crypto.Error as CE
+import Crypto.Hash (Digest, hashlazy)
+import Crypto.Hash.Algorithms (SHA256, SHA512)
+import qualified Crypto.MAC.Poly1305 as Poly1305
+import Data.Bifunctor (first)
+import Data.ByteArray (ByteArrayAccess)
+import qualified Data.ByteArray as BA
+import qualified Data.ByteString as S
+import Data.ByteString.Char8 (ByteString)
+import qualified Data.ByteString.Char8 as B
+import qualified Data.ByteString.Lazy.Char8 as LB
+import qualified Data.ByteString.Lazy.Internal as LB
+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.Encoding
+
+type LazyByteString = LB.ByteString
+
+-- | SHA512 digest of a lazy bytestring.
+sha256Hash :: LazyByteString -> ByteString
+sha256Hash = BA.convert . (hashlazy :: LazyByteString -> Digest SHA256)
+
+-- | SHA512 digest of a lazy bytestring.
+sha512Hash :: LazyByteString -> ByteString
+sha512Hash = BA.convert . (hashlazy :: LazyByteString -> Digest SHA512)
+
+-- this function does not validate the length of the message to avoid consuming all chunks,
+-- but if the passed string is longer it will truncate it to specified length
+pad :: LazyByteString -> Int64 -> Int64 -> Either CryptoError LazyByteString
+pad msg len paddedLen
+  | padLen >= 0 = Right $ LB.fromStrict encodedLen <> LB.take len msg <> fastReplicate padLen '#'
+  | otherwise = Left CryptoLargeMsgError
+  where
+    encodedLen = smpEncode len -- 8 bytes Int64 encoded length
+    padLen = paddedLen - len - 8
+
+fastReplicate :: Int64 -> Char -> LazyByteString
+fastReplicate n c
+  | n <= 0 = LB.empty
+  | n < chSize' = LB.fromStrict $ B.replicate (fromIntegral n) c
+  | otherwise = LB.fromChunks $ B.replicate (fromIntegral r) c : replicate (fromIntegral q) chPad
+  where
+    chSize = 65536 - 2 * sizeOf (undefined :: Int)
+    chPad = B.replicate chSize c
+    chSize' = fromIntegral chSize
+    (q, r) = quotRem n chSize'
+
+-- this function does not validate the length of the message to avoid consuming all chunks,
+-- so it can return a shorter string than expected
+unPad :: LazyByteString -> Either CryptoError LazyByteString
+unPad = fmap snd . splitLen
+
+splitLen :: LazyByteString -> Either CryptoError (Int64, LazyByteString)
+splitLen padded
+  | LB.length lenStr == 8 = case smpDecode $ LB.toStrict lenStr of
+    Right len
+      | len < 0 -> Left CryptoInvalidMsgError
+      | otherwise -> Right (len, LB.take len rest)
+    Left _ -> Left CryptoInvalidMsgError
+  | otherwise = Left CryptoInvalidMsgError
+  where
+    (lenStr, rest) = LB.splitAt 8 padded
+
+-- | NaCl @secret_box@ lazy encrypt with a symmetric 256-bit key and 192-bit nonce.
+-- The resulting string will be bigger than paddedLen by the size of the auth tag (16 bytes).
+sbEncrypt :: SbKey -> CbNonce -> LazyByteString -> Int64 -> Int64 -> Either CryptoError LazyByteString
+sbEncrypt (SbKey key) (CbNonce nonce) msg len paddedLen =
+  prependTag <$> (secretBox sbEncryptChunk key nonce =<< pad msg len paddedLen)
+  where
+    prependTag (tag :| cs) = LB.Chunk tag $ LB.fromChunks cs
+
+-- | NaCl @secret_box@ decrypt with a symmetric 256-bit key and 192-bit nonce.
+-- The resulting string will be smaller than packet size by the size of the auth tag (16 bytes).
+sbDecrypt :: SbKey -> CbNonce -> LazyByteString -> Either CryptoError LazyByteString
+sbDecrypt (SbKey key) (CbNonce nonce) packet
+  | LB.length tag' < 16 = Left CBDecryptError
+  | otherwise = case secretBox sbDecryptChunk key nonce c of
+    Right (tag :| cs)
+      | BA.constEq (LB.toStrict tag') tag -> unPad $ LB.fromChunks cs
+      | otherwise -> Left CBDecryptError
+    Left e -> Left e
+  where
+    (tag', c) = LB.splitAt 16 packet
+
+secretBox :: ByteArrayAccess key => (SbState -> ByteString -> (ByteString, SbState)) -> key -> ByteString -> LazyByteString -> Either CryptoError (NonEmpty ByteString)
+secretBox sbProcess secret nonce msg = run <$> sbInit_ secret nonce
+  where
+    run state =
+      let (!cs, !state') = secretBoxLazy_ sbProcess state msg
+       in BA.convert (sbAuth state') :| reverse cs
+
+-- | NaCl @secret_box@ lazy encrypt with a symmetric 256-bit key and 192-bit nonce with appended auth tag (more efficient with large files).
+sbEncryptTailTag :: SbKey -> CbNonce -> LazyByteString -> Int64 -> Int64 -> Either CryptoError LazyByteString
+sbEncryptTailTag (SbKey key) (CbNonce nonce) msg len paddedLen =
+  LB.fromChunks <$> (secretBoxTailTag sbEncryptChunk key nonce =<< pad msg len paddedLen)
+
+-- | 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)
+sbDecryptTailTag (SbKey key) (CbNonce nonce) paddedLen packet =
+  case secretBox sbDecryptChunk key nonce c of
+    Right (tag :| cs) ->
+      let valid = LB.length tag' == 16 && BA.constEq (LB.toStrict tag') tag
+       in (valid,) <$> unPad (LB.fromChunks cs)
+    Left e -> Left e
+  where
+    (c, tag') = LB.splitAt paddedLen packet
+
+secretBoxTailTag :: ByteArrayAccess key => (SbState -> ByteString -> (ByteString, SbState)) -> key -> ByteString -> LazyByteString -> Either CryptoError [ByteString]
+secretBoxTailTag sbProcess secret nonce msg = run <$> sbInit_ secret nonce
+  where
+    run state =
+      let (cs, state') = secretBoxLazy_ sbProcess state msg
+       in reverse $ BA.convert (sbAuth state') : cs
+
+-- passes lazy bytestring via initialized secret box returning the reversed list of chunks
+secretBoxLazy_ :: (SbState -> ByteString -> (ByteString, SbState)) -> SbState -> LazyByteString -> ([ByteString], SbState)
+secretBoxLazy_ sbProcess state = foldlChunks update ([], state)
+  where
+    update (cs, st) chunk = let (!c, !st') = sbProcess st chunk in (c : cs, st')
+
+type SbState = (XSalsa.State, Poly1305.State)
+
+cbInit :: DhSecretX25519 -> CbNonce -> Either CryptoError SbState
+cbInit (DhSecretX25519 secret) (CbNonce nonce) = sbInit_ secret nonce
+{-# INLINE cbInit #-}
+
+sbInit :: SbKey -> CbNonce -> Either CryptoError SbState
+sbInit (SbKey secret) (CbNonce nonce) = sbInit_ secret nonce
+{-# INLINE sbInit #-}
+
+sbInit_ :: ByteArrayAccess key => key -> ByteString -> Either CryptoError SbState
+sbInit_ secret nonce = (state2,) <$> cryptoPassed (Poly1305.initialize rs)
+  where
+    zero = B.replicate 16 $ toEnum 0
+    (iv0, iv1) = B.splitAt 8 nonce
+    state0 = XSalsa.initialize 20 secret (zero `B.append` iv0)
+    state1 = XSalsa.derive state0 iv1
+    (rs :: ByteString, state2) = XSalsa.generate state1 32
+
+sbEncryptChunkLazy :: SbState -> LazyByteString -> (LazyByteString, SbState)
+sbEncryptChunkLazy = sbProcessChunkLazy_ sbEncryptChunk
+
+sbDecryptChunkLazy :: SbState -> LazyByteString -> (LazyByteString, SbState)
+sbDecryptChunkLazy = sbProcessChunkLazy_ sbDecryptChunk
+
+sbProcessChunkLazy_ :: (SbState -> ByteString -> (ByteString, SbState)) -> SbState -> LazyByteString -> (LazyByteString, SbState)
+sbProcessChunkLazy_ = first (LB.fromChunks . reverse) .:. secretBoxLazy_
+{-# INLINE sbProcessChunkLazy_ #-}
+
+sbEncryptChunk :: SbState -> ByteString -> (ByteString, SbState)
+sbEncryptChunk (st, authSt) chunk =
+  let (!c, !st') = XSalsa.combine st chunk
+      !authSt' = Poly1305.update authSt c
+   in (c, (st', authSt'))
+
+sbDecryptChunk :: SbState -> ByteString -> (ByteString, SbState)
+sbDecryptChunk (st, authSt) chunk =
+  let (!s, !st') = XSalsa.combine st chunk
+      !authSt' = Poly1305.update authSt chunk
+   in (s, (st', authSt'))
+
+sbAuth :: SbState -> Poly1305.Auth
+sbAuth = Poly1305.finalize . snd
+
+cryptoPassed :: CE.CryptoFailable b -> Either CryptoError b
+cryptoPassed = \case
+  CE.CryptoPassed a -> Right a
+  CE.CryptoFailed e -> Left $ CryptoPoly1305Error e
+
+foldlChunks :: (a -> S.ByteString -> a) -> a -> LazyByteString -> a
+foldlChunks f = go
+  where
+    go !a LB.Empty = a
+    go !a (LB.Chunk c cs) = go (f a c) cs
+{-# INLINE foldlChunks #-}

src/Simplex/Messaging/Crypto/Ratchet.hs

@@ -423,9 +423,9 @@ rcDecrypt rc@Ratchet {rcRcv, rcAD = Str rcAD} rcMKSkipped msg' = do
     skipMessageKeys :: Word32 -> Ratchet a -> Either CryptoError (Ratchet a, SkippedMsgKeys)
     skipMessageKeys _ r@Ratchet {rcRcv = Nothing} = Right (r, M.empty)
     skipMessageKeys untilN r@Ratchet {rcRcv = Just rr@RcvRatchet {rcCKr, rcHKr}, rcNr}
-      | rcNr > untilN + 1 = Left CERatchetEarlierMessage
+      | rcNr > untilN + 1 = Left $ CERatchetEarlierMessage (rcNr - untilN - 1)
       | rcNr == untilN + 1 = Left CERatchetDuplicateMessage
-      | rcNr + maxSkip < untilN = Left CERatchetTooManySkipped
+      | rcNr + maxSkip < untilN = Left $ CERatchetTooManySkipped (untilN + 1 - rcNr)
       | rcNr == untilN = Right (r, M.empty)
       | otherwise =
         let (rcCKr', rcNr', mks) = advanceRcvRatchet (untilN - rcNr) rcCKr rcNr M.empty

src/Simplex/Messaging/Encoding/String.hs

@@ -36,7 +36,7 @@ import Data.Text.Encoding (decodeLatin1, encodeUtf8)
 import Data.Time.Clock (UTCTime)
 import Data.Time.Clock.System (SystemTime (..))
 import Data.Time.Format.ISO8601
-import Data.Word (Word16)
+import Data.Word (Word16, Word32)
 import Simplex.Messaging.Encoding
 import Simplex.Messaging.Parsers (parseAll)
 import Simplex.Messaging.Util ((<$?>))
@@ -75,6 +75,10 @@ instance StrEncoding Str where
   strEncode = unStr
   strP = Str <$> A.takeTill (== ' ') <* optional A.space
 
+instance StrEncoding String where
+  strEncode = strEncode . B.pack
+  strP = B.unpack <$> strP
+
 instance ToJSON Str where
   toJSON (Str s) = strToJSON s
   toEncoding (Str s) = strToJEncoding s
@@ -94,6 +98,12 @@ instance StrEncoding Word16 where
   strP = A.decimal
   {-# INLINE strP #-}
 
+instance StrEncoding Word32 where
+  strEncode = B.pack . show
+  {-# INLINE strEncode #-}
+  strP = A.decimal
+  {-# INLINE strP #-}
+
 instance StrEncoding Char where
   strEncode = smpEncode
   {-# INLINE strEncode #-}

src/Simplex/Messaging/Notifications/Client.hs

@@ -10,54 +10,57 @@ import Data.Word (Word16)
 import Simplex.Messaging.Client
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Notifications.Protocol
+import Simplex.Messaging.Protocol (ErrorType)
 import Simplex.Messaging.Util (bshow)
 
-type NtfClient = ProtocolClient NtfResponse
+type NtfClient = ProtocolClient ErrorType NtfResponse
 
-ntfRegisterToken :: NtfClient -> C.APrivateSignKey -> NewNtfEntity 'Token -> ExceptT ProtocolClientError IO (NtfTokenId, C.PublicKeyX25519)
+type NtfClientError = ProtocolClientError ErrorType
+
+ntfRegisterToken :: NtfClient -> C.APrivateSignKey -> NewNtfEntity 'Token -> ExceptT NtfClientError IO (NtfTokenId, C.PublicKeyX25519)
 ntfRegisterToken c pKey newTkn =
   sendNtfCommand c (Just pKey) "" (TNEW newTkn) >>= \case
     NRTknId tknId dhKey -> pure (tknId, dhKey)
     r -> throwE . PCEUnexpectedResponse $ bshow r
 
-ntfVerifyToken :: NtfClient -> C.APrivateSignKey -> NtfTokenId -> NtfRegCode -> ExceptT ProtocolClientError IO ()
+ntfVerifyToken :: NtfClient -> C.APrivateSignKey -> NtfTokenId -> NtfRegCode -> ExceptT NtfClientError IO ()
 ntfVerifyToken c pKey tknId code = okNtfCommand (TVFY code) c pKey tknId
 
-ntfCheckToken :: NtfClient -> C.APrivateSignKey -> NtfTokenId -> ExceptT ProtocolClientError IO NtfTknStatus
+ntfCheckToken :: NtfClient -> C.APrivateSignKey -> NtfTokenId -> ExceptT NtfClientError IO NtfTknStatus
 ntfCheckToken c pKey tknId =
   sendNtfCommand c (Just pKey) tknId TCHK >>= \case
     NRTkn stat -> pure stat
     r -> throwE . PCEUnexpectedResponse $ bshow r
 
-ntfReplaceToken :: NtfClient -> C.APrivateSignKey -> NtfTokenId -> DeviceToken -> ExceptT ProtocolClientError IO ()
+ntfReplaceToken :: NtfClient -> C.APrivateSignKey -> NtfTokenId -> DeviceToken -> ExceptT NtfClientError IO ()
 ntfReplaceToken c pKey tknId token = okNtfCommand (TRPL token) c pKey tknId
 
-ntfDeleteToken :: NtfClient -> C.APrivateSignKey -> NtfTokenId -> ExceptT ProtocolClientError IO ()
+ntfDeleteToken :: NtfClient -> C.APrivateSignKey -> NtfTokenId -> ExceptT NtfClientError IO ()
 ntfDeleteToken = okNtfCommand TDEL
 
-ntfEnableCron :: NtfClient -> C.APrivateSignKey -> NtfTokenId -> Word16 -> ExceptT ProtocolClientError IO ()
+ntfEnableCron :: NtfClient -> C.APrivateSignKey -> NtfTokenId -> Word16 -> ExceptT NtfClientError IO ()
 ntfEnableCron c pKey tknId int = okNtfCommand (TCRN int) c pKey tknId
 
-ntfCreateSubscription :: NtfClient -> C.APrivateSignKey -> NewNtfEntity 'Subscription -> ExceptT ProtocolClientError IO NtfSubscriptionId
+ntfCreateSubscription :: NtfClient -> C.APrivateSignKey -> NewNtfEntity 'Subscription -> ExceptT NtfClientError IO NtfSubscriptionId
 ntfCreateSubscription c pKey newSub =
   sendNtfCommand c (Just pKey) "" (SNEW newSub) >>= \case
     NRSubId subId -> pure subId
     r -> throwE . PCEUnexpectedResponse $ bshow r
 
-ntfCheckSubscription :: NtfClient -> C.APrivateSignKey -> NtfSubscriptionId -> ExceptT ProtocolClientError IO NtfSubStatus
+ntfCheckSubscription :: NtfClient -> C.APrivateSignKey -> NtfSubscriptionId -> ExceptT NtfClientError IO NtfSubStatus
 ntfCheckSubscription c pKey subId =
   sendNtfCommand c (Just pKey) subId SCHK >>= \case
     NRSub stat -> pure stat
     r -> throwE . PCEUnexpectedResponse $ bshow r
 
-ntfDeleteSubscription :: NtfClient -> C.APrivateSignKey -> NtfSubscriptionId -> ExceptT ProtocolClientError IO ()
+ntfDeleteSubscription :: NtfClient -> C.APrivateSignKey -> NtfSubscriptionId -> ExceptT NtfClientError IO ()
 ntfDeleteSubscription = okNtfCommand SDEL
 
 -- | Send notification server command
-sendNtfCommand :: NtfEntityI e => NtfClient -> Maybe C.APrivateSignKey -> NtfEntityId -> NtfCommand e -> ExceptT ProtocolClientError IO NtfResponse
+sendNtfCommand :: NtfEntityI e => NtfClient -> Maybe C.APrivateSignKey -> NtfEntityId -> NtfCommand e -> ExceptT NtfClientError IO NtfResponse
 sendNtfCommand c pKey entId cmd = sendProtocolCommand c pKey entId (NtfCmd sNtfEntity cmd)
 
-okNtfCommand :: NtfEntityI e => NtfCommand e -> NtfClient -> C.APrivateSignKey -> NtfEntityId -> ExceptT ProtocolClientError IO ()
+okNtfCommand :: NtfEntityI e => NtfCommand e -> NtfClient -> C.APrivateSignKey -> NtfEntityId -> ExceptT NtfClientError IO ()
 okNtfCommand cmd c pKey entId =
   sendNtfCommand c (Just pKey) entId cmd >>= \case
     NROk -> return ()

src/Simplex/Messaging/Notifications/Protocol.hs

@@ -1,6 +1,7 @@
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE GADTs #-}
 {-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE ScopedTypeVariables #-}
@@ -146,7 +147,7 @@ instance Encoding ANewNtfEntity where
       'S' -> ANE SSubscription <$> (NewNtfSub <$> smpP <*> smpP <*> smpP)
       _ -> fail "bad ANewNtfEntity"
 
-instance Protocol NtfResponse where
+instance Protocol ErrorType NtfResponse where
   type ProtoCommand NtfResponse = NtfCmd
   type ProtoType NtfResponse = 'PNTF
   protocolClientHandshake = ntfClientHandshake
@@ -183,7 +184,7 @@ data NtfCmd = forall e. NtfEntityI e => NtfCmd (SNtfEntity e) (NtfCommand e)
 
 deriving instance Show NtfCmd
 
-instance NtfEntityI e => ProtocolEncoding (NtfCommand e) where
+instance NtfEntityI e => ProtocolEncoding ErrorType (NtfCommand e) where
   type Tag (NtfCommand e) = NtfCommandTag e
   encodeProtocol _v = \case
     TNEW newTkn -> e (TNEW_, ' ', newTkn)
@@ -202,6 +203,9 @@ instance NtfEntityI e => ProtocolEncoding (NtfCommand e) where
 
   protocolP _v tag = (\(NtfCmd _ c) -> checkEntity c) <$?> protocolP _v (NCT (sNtfEntity @e) tag)
 
+  fromProtocolError = fromProtocolError @ErrorType @NtfResponse
+  {-# INLINE fromProtocolError #-}
+
   checkCredentials (sig, _, entityId, _) cmd = case cmd of
     -- TNEW and SNEW must have signature but NOT token/subscription IDs
     TNEW {} -> sigNoEntity
@@ -219,7 +223,7 @@ instance NtfEntityI e => ProtocolEncoding (NtfCommand e) where
         | not (B.null entityId) = Left $ CMD HAS_AUTH
         | otherwise = Right cmd
 
-instance ProtocolEncoding NtfCmd where
+instance ProtocolEncoding ErrorType NtfCmd where
   type Tag NtfCmd = NtfCmdTag
   encodeProtocol _v (NtfCmd _ c) = encodeProtocol _v c
 
@@ -239,6 +243,9 @@ instance ProtocolEncoding NtfCmd where
         SDEL_ -> pure SDEL
         PING_ -> pure PING
 
+  fromProtocolError = fromProtocolError @ErrorType @NtfResponse
+  {-# INLINE fromProtocolError #-}
+
   checkCredentials t (NtfCmd e c) = NtfCmd e <$> checkCredentials t c
 
 data NtfResponseTag
@@ -283,7 +290,7 @@ data NtfResponse
   | NRPong
   deriving (Show)
 
-instance ProtocolEncoding NtfResponse where
+instance ProtocolEncoding ErrorType NtfResponse where
   type Tag NtfResponse = NtfResponseTag
   encodeProtocol _v = \case
     NRTknId entId dhKey -> e (NRTknId_, ' ', entId, dhKey)
@@ -306,6 +313,13 @@ instance ProtocolEncoding NtfResponse where
     NRSub_ -> NRSub <$> _smpP
     NRPong_ -> pure NRPong
 
+  fromProtocolError = \case
+    PECmdSyntax -> CMD SYNTAX
+    PECmdUnknown -> CMD UNKNOWN
+    PESession -> SESSION
+    PEBlock -> BLOCK
+  {-# INLINE fromProtocolError #-}
+
   checkCredentials (_, _, entId, _) cmd = case cmd of
     -- IDTKN response must not have queue ID
     NRTknId {} -> noEntity
@@ -415,7 +429,7 @@ data NtfSubStatus
     NSAuth
   | -- | SMP error other than AUTH
     NSErr ByteString
-  deriving (Eq, Show)
+  deriving (Eq, Ord, Show)
 
 ntfShouldSubscribe :: NtfSubStatus -> Bool
 ntfShouldSubscribe = \case

src/Simplex/Messaging/Notifications/Server.hs

@@ -16,18 +16,24 @@ import Control.Concurrent.STM (stateTVar)
 import Control.Logger.Simple
 import Control.Monad.Except
 import Control.Monad.Reader
+import Data.Bifunctor (second)
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
 import Data.Functor (($>))
-import Data.List (intercalate)
+import Data.Int (Int64)
+import Data.List (intercalate, sort)
+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)
 import qualified Data.Text as T
 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 Simplex.Messaging.Client (ProtocolClientError (..))
+import Simplex.Messaging.Client (ProtocolClientError (..), SMPClientError)
 import Simplex.Messaging.Client.Agent
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Encoding.String
@@ -50,7 +56,7 @@ import System.Exit (exitFailure)
 import System.IO (BufferMode (..), hPutStrLn, hSetBuffering)
 import System.Mem.Weak (deRefWeak)
 import UnliftIO (IOMode (..), async, uninterruptibleCancel, withFile)
-import UnliftIO.Concurrent (forkIO, killThread, mkWeakThreadId, threadDelay)
+import UnliftIO.Concurrent (forkIO, killThread, mkWeakThreadId)
 import UnliftIO.Directory (doesFileExist, renameFile)
 import UnliftIO.Exception
 import UnliftIO.STM
@@ -97,11 +103,11 @@ ntfServer cfg@NtfServerConfig {transports, logTLSErrors} started = do
       [logServerStats logStatsStartTime interval serverStatsLogFile]
     serverStatsThread_ _ = []
 
-    logServerStats :: Int -> Int -> FilePath -> M ()
+    logServerStats :: Int64 -> Int64 -> FilePath -> M ()
     logServerStats startAt logInterval statsFilePath = do
       initialDelay <- (startAt -) . fromIntegral . (`div` 1000000_000000) . diffTimeToPicoseconds . utctDayTime <$> liftIO getCurrentTime
       liftIO $ putStrLn $ "server stats log enabled: " <> statsFilePath
-      threadDelay $ 1000000 * (initialDelay + if initialDelay < 0 then 86400 else 0)
+      liftIO $ threadDelay' $ 1000000 * (initialDelay + if initialDelay < 0 then 86400 else 0)
       NtfServerStats {fromTime, tknCreated, tknVerified, tknDeleted, subCreated, subDeleted, ntfReceived, ntfDelivered, activeTokens, activeSubs} <- asks serverStats
       let interval = 1000000 * logInterval
       withFile statsFilePath AppendMode $ \h -> liftIO $ do
@@ -136,28 +142,36 @@ ntfServer cfg@NtfServerConfig {transports, logTLSErrors} started = do
                 weekCount sub,
                 monthCount sub
               ]
-          threadDelay interval
+          threadDelay' interval
 
 resubscribe :: NtfSubscriber -> Map NtfSubscriptionId NtfSubData -> M ()
 resubscribe NtfSubscriber {newSubQ} subs = do
-  d <- asks $ resubscribeDelay . config
-  forM_ subs $ \sub@NtfSubData {} ->
-    whenM (ntfShouldSubscribe <$> readTVarIO (subStatus sub)) $ do
-      atomically $ writeTBQueue newSubQ $ NtfSub sub
-      threadDelay d
-  liftIO $ logInfo "SMP connections resubscribed"
+  subs' <- atomically $ filterM (fmap ntfShouldSubscribe . readTVar . subStatus) $ M.elems subs
+  atomically . writeTBQueue newSubQ $ map NtfSub subs'
+  liftIO $ logInfo $ "SMP resubscriptions queued (" <> tshow (length subs') <> " subscriptions)"
 
 ntfSubscriber :: NtfSubscriber -> M ()
 ntfSubscriber NtfSubscriber {smpSubscribers, newSubQ, smpAgent = ca@SMPClientAgent {msgQ, agentQ}} = do
   raceAny_ [subscribe, receiveSMP, receiveAgent]
   where
     subscribe :: M ()
-    subscribe =
-      forever $
-        atomically (readTBQueue newSubQ) >>= \case
-          sub@(NtfSub NtfSubData {smpQueue = SMPQueueNtf {smpServer}}) -> do
-            SMPSubscriber {newSubQ = subscriberSubQ} <- getSMPSubscriber smpServer
-            atomically $ writeTQueue subscriberSubQ sub
+    subscribe = forever $ do
+      subs <- atomically (readTBQueue newSubQ)
+      let ss = L.groupAllWith server subs
+      forM_ ss $ \serverSubs -> do
+        let srv = server $ L.head serverSubs
+            batches = toChunks 900 $ L.toList serverSubs
+        SMPSubscriber {newSubQ = subscriberSubQ} <- getSMPSubscriber srv
+        mapM_ (atomically . writeTQueue subscriberSubQ) batches
+
+    toChunks :: Int -> [a] -> [NonEmpty a]
+    toChunks _ [] = []
+    toChunks n xs =
+      let (ys, xs') = splitAt n xs
+      in maybe id (:) (L.nonEmpty ys) (toChunks n xs')
+
+    server :: NtfEntityRec 'Subscription -> SMPServer
+    server (NtfSub sub) = ntfSubServer sub
 
     getSMPSubscriber :: SMPServer -> M SMPSubscriber
     getSMPSubscriber smpServer =
@@ -172,25 +186,40 @@ ntfSubscriber NtfSubscriber {smpSubscribers, newSubQ, smpAgent = ca@SMPClientAge
 
     runSMPSubscriber :: SMPSubscriber -> M ()
     runSMPSubscriber SMPSubscriber {newSubQ = subscriberSubQ} =
-      forever $
-        atomically (peekTQueue subscriberSubQ)
-          >>= \(NtfSub NtfSubData {smpQueue, notifierKey}) -> do
-            updateSubStatus smpQueue NSPending
-            let SMPQueueNtf {smpServer, notifierId} = smpQueue
-            liftIO (runExceptT $ subscribeQueue ca smpServer ((SPNotifier, notifierId), notifierKey)) >>= \case
-              Right _ -> do
-                updateSubStatus smpQueue NSActive
-                void . atomically $ readTQueue subscriberSubQ
-              Left err -> do
-                handleSubError smpQueue err
-                case err of
-                  PCEResponseTimeout -> pure ()
-                  PCENetworkError -> pure ()
-                  _ -> void . atomically $ readTQueue subscriberSubQ
+      forever $ do
+        subs <- atomically (peekTQueue subscriberSubQ)
+        let subs' = L.map (\(NtfSub sub) -> sub) subs
+            srv = server $ L.head subs
+        logSubStatus srv "subscribing" $ length subs
+        mapM_ (\NtfSubData {smpQueue} -> updateSubStatus smpQueue NSPending) subs'
+        rs <- liftIO $ subscribeQueues srv subs'
+        (subs'', oks, errs) <- foldM process ([], 0, []) rs
+        atomically $ do
+          void $ readTQueue subscriberSubQ
+          mapM_ (writeTQueue subscriberSubQ . L.map NtfSub) $ L.nonEmpty subs''
+        logSubStatus srv "retrying" $ length subs''
+        logSubStatus srv "subscribed" oks
+        logSubErrors srv errs
+      where
+        process :: ([NtfSubData], Int, [NtfSubStatus]) -> (NtfSubData, Either SMPClientError ()) -> M ([NtfSubData], Int, [NtfSubStatus])
+        process (subs, oks, errs) (sub@NtfSubData {smpQueue}, r) = case r of
+          Right _ -> updateSubStatus smpQueue NSActive $> (subs, oks + 1, errs)
+          Left e -> update <$> handleSubError smpQueue e
+          where
+            update = \case
+              Just err -> (subs, oks, err : errs) -- permanent error, log and don't retry subscription
+              Nothing -> (sub : subs, oks, errs) -- temporary error, retry subscription
+
+    -- | Subscribe to queues. The list of results can have a different order.
+    subscribeQueues :: SMPServer -> NonEmpty NtfSubData -> IO (NonEmpty (NtfSubData, Either SMPClientError ()))
+    subscribeQueues srv subs =
+      L.map (second snd) . L.zip subs <$> subscribeQueuesNtfs ca srv (L.map sub subs)
+      where
+        sub NtfSubData {smpQueue = SMPQueueNtf {notifierId}, notifierKey} = (notifierId, notifierKey)
 
     receiveSMP :: M ()
     receiveSMP = forever $ do
-      (srv, _, _, ntfId, msg) <- atomically $ readTBQueue msgQ
+      ((_, srv, _), _, _, ntfId, msg) <- atomically $ readTBQueue msgQ
       let smpQueue = SMPQueueNtf srv ntfId
       case msg of
         SMP.NMSG nmsgNonce encNMsgMeta -> do
@@ -211,37 +240,43 @@ ntfSubscriber NtfSubscriber {smpSubscribers, newSubQ, smpAgent = ca@SMPClientAge
         atomically (readTBQueue agentQ) >>= \case
           CAConnected _ -> pure ()
           CADisconnected srv subs -> do
-            logInfo $ "SMP server disconnected " <> showServer' srv <> " (" <> tshow (length subs) <> ") subscriptions"
+            logSubStatus srv "disconnected" $ length subs
             forM_ subs $ \(_, ntfId) -> do
               let smpQueue = SMPQueueNtf srv ntfId
               updateSubStatus smpQueue NSInactive
           CAReconnected srv ->
             logInfo $ "SMP server reconnected " <> showServer' srv
-          CAResubscribed srv sub -> do
-            let ntfId = snd sub
-                smpQueue = SMPQueueNtf srv ntfId
-            updateSubStatus smpQueue NSActive
-          CASubError srv (_, ntfId) err -> do
-            logError $ "SMP subscription error on server " <> showServer' srv <> ": " <> tshow err
-            handleSubError (SMPQueueNtf srv ntfId) err
-      where
-        showServer' = decodeLatin1 . strEncode . host
+          CAResubscribed srv subs -> do
+            forM_ subs $ \(_, ntfId) -> updateSubStatus (SMPQueueNtf srv ntfId) NSActive
+            logSubStatus srv "resubscribed" $ length subs
+          CASubError srv errs ->
+            forM errs (\((_, ntfId), err) -> handleSubError (SMPQueueNtf srv ntfId) err)
+              >>= logSubErrors srv . catMaybes . L.toList
 
-    handleSubError :: SMPQueueNtf -> ProtocolClientError -> M ()
+    logSubStatus srv event n = when (n > 0) $
+      logInfo $ "SMP server " <> event <> " " <> showServer' srv <> " (" <> tshow n <> " subscriptions)"
+
+    logSubErrors :: SMPServer -> [NtfSubStatus] -> M ()        
+    logSubErrors srv errs = forM_ (L.group $ sort errs) $ \errs' -> do
+      logError $ "SMP subscription errors on server " <> showServer' srv <> ": " <> tshow (L.head errs') <> " (" <> tshow (length errs') <> " errors)"
+
+    showServer' = decodeLatin1 . strEncode . host
+
+    handleSubError :: SMPQueueNtf -> SMPClientError -> M (Maybe NtfSubStatus)
     handleSubError smpQueue = \case
-      PCEProtocolError AUTH -> updateSubStatus smpQueue NSAuth
+      PCEProtocolError AUTH -> updateSubStatus smpQueue NSAuth $> Just NSAuth
       PCEProtocolError e -> updateErr "SMP error " e
-      PCEIOError e -> updateErr "IOError " e
       PCEResponseError e -> updateErr "ResponseError " e
       PCEUnexpectedResponse r -> updateErr "UnexpectedResponse " r
       PCETransportError e -> updateErr "TransportError " e
-      PCESignatureError e -> updateErr "SignatureError " e
-      PCEIncompatibleHost -> updateSubStatus smpQueue $ NSErr "IncompatibleHost"
-      PCEResponseTimeout -> pure ()
-      PCENetworkError -> pure ()
+      PCECryptoError e -> updateErr "CryptoError " e
+      PCEIncompatibleHost -> let e = NSErr "IncompatibleHost" in updateSubStatus smpQueue e $> Just e
+      PCEResponseTimeout -> pure Nothing
+      PCENetworkError -> pure Nothing
+      PCEIOError _ -> pure Nothing
       where
-        updateErr :: Show e => ByteString -> e -> M ()
-        updateErr errType e = updateSubStatus smpQueue . NSErr $ errType <> bshow e
+        updateErr :: Show e => ByteString -> e -> M (Maybe NtfSubStatus)
+        updateErr errType e = updateSubStatus smpQueue (NSErr $ errType <> bshow e) $> Just (NSErr errType)
 
     updateSubStatus smpQueue status = do
       st <- asks store
@@ -319,7 +354,7 @@ clientDisconnected NtfServerClient {connected} = atomically $ writeTVar connecte
 
 receive :: Transport c => THandle c -> NtfServerClient -> M ()
 receive th NtfServerClient {rcvQ, sndQ, activeAt} = forever $ do
-  ts <- tGet th
+  ts <- liftIO $ tGet th
   forM_ ts $ \t@(_, _, (corrId, entId, cmdOrError)) -> do
     atomically . writeTVar activeAt =<< liftIO getSystemTime
     logDebug "received transmission"
@@ -335,7 +370,7 @@ receive th NtfServerClient {rcvQ, sndQ, activeAt} = forever $ do
 send :: Transport c => THandle c -> NtfServerClient -> IO ()
 send h@THandle {thVersion = v} NtfServerClient {sndQ, sessionId, activeAt} = forever $ do
   t <- atomically $ readTBQueue sndQ
-  void . liftIO $ tPut h [(Nothing, encodeTransmission v sessionId t)]
+  void . liftIO $ tPut h Nothing [(Nothing, encodeTransmission v sessionId t)]
   atomically . writeTVar activeAt =<< liftIO getSystemTime
 
 -- instance Show a => Show (TVar a) where
@@ -343,7 +378,7 @@ send h@THandle {thVersion = v} NtfServerClient {sndQ, sessionId, activeAt} = for
 
 data VerificationResult = VRVerified NtfRequest | VRFailed
 
-verifyNtfTransmission :: SignedTransmission NtfCmd -> NtfCmd -> M VerificationResult
+verifyNtfTransmission :: SignedTransmission ErrorType NtfCmd -> NtfCmd -> M VerificationResult
 verifyNtfTransmission (sig_, signed, (corrId, entId, _)) cmd = do
   st <- asks store
   case cmd of
@@ -372,6 +407,7 @@ verifyNtfTransmission (sig_, signed, (corrId, entId, _)) cmd = do
               t_ <- atomically $ getActiveNtfToken st subTknId
               verifyToken' t_ $ verifiedSubCmd s c
             else pure $ maybe False (dummyVerifyCmd signed) sig_ `seq` VRFailed
+    NtfCmd SSubscription PING -> pure $ VRVerified $ NtfReqPing corrId entId
     NtfCmd SSubscription c -> do
       s_ <- atomically $ getNtfSubscription st entId
       case s_ of
@@ -493,7 +529,7 @@ client NtfServerClient {rcvQ, sndQ} NtfSubscriber {newSubQ, smpAgent = ca} NtfPu
                 atomically $ TM.insert tknId notifier intervalNotifiers
                 where
                   intervalNotifier delay = forever $ do
-                    threadDelay delay
+                    liftIO $ threadDelay' delay
                     atomically $ writeTBQueue pushQ (tkn, PNCheckMessages)
       NtfReqNew corrId (ANE SSubscription newSub) -> do
         logDebug "SNEW - new subscription"
@@ -502,7 +538,7 @@ client NtfServerClient {rcvQ, sndQ} NtfSubscriber {newSubQ, smpAgent = ca} NtfPu
         sub <- atomically $ mkNtfSubData subId newSub
         resp <-
           atomically (addNtfSubscription st subId sub) >>= \case
-            Just _ -> atomically (writeTBQueue newSubQ $ NtfSub sub) $> NRSubId subId
+            Just _ -> atomically (writeTBQueue newSubQ [NtfSub sub]) $> NRSubId subId
             _ -> pure $ NRErr AUTH
         withNtfLog (`logCreateSubscription` sub)
         incNtfStat subCreated
@@ -529,6 +565,7 @@ client NtfServerClient {rcvQ, sndQ} NtfSubscriber {newSubQ, smpAgent = ca} NtfPu
             incNtfStat subDeleted
             pure NROk
           PING -> pure NRPong
+      NtfReqPing corrId entId -> pure (corrId, entId, NRPong)
     getId :: M NtfEntityId
     getId = getRandomBytes =<< asks (subIdBytes . config)
     getRegCode :: M NtfRegCode
@@ -548,7 +585,7 @@ withNtfLog action = liftIO . mapM_ action =<< asks storeLog
 incNtfStat :: (NtfServerStats -> TVar Int) -> M ()
 incNtfStat statSel = do
   stats <- asks serverStats
-  atomically $ modifyTVar (statSel stats) (+ 1)
+  atomically $ modifyTVar' (statSel stats) (+ 1)
 
 saveServerStats :: M ()
 saveServerStats =

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

@@ -11,6 +11,8 @@ import Control.Concurrent.Async (Async)
 import Control.Monad.IO.Unlift
 import Crypto.Random
 import Data.ByteString.Char8 (ByteString)
+import Data.Int (Int64)
+import Data.List.NonEmpty (NonEmpty)
 import Data.Time.Clock (getCurrentTime)
 import Data.Time.Clock.System (SystemTime)
 import Data.Word (Word16)
@@ -46,14 +48,13 @@ data NtfServerConfig = NtfServerConfig
     apnsConfig :: APNSPushClientConfig,
     inactiveClientExpiration :: Maybe ExpirationConfig,
     storeLogFile :: Maybe FilePath,
-    resubscribeDelay :: Int, -- microseconds
     -- CA certificate private key is not needed for initialization
     caCertificateFile :: FilePath,
     privateKeyFile :: FilePath,
     certificateFile :: FilePath,
     -- stats config - see SMP server config
-    logStatsInterval :: Maybe Int,
-    logStatsStartTime :: Int,
+    logStatsInterval :: Maybe Int64,
+    logStatsStartTime :: Int64,
     serverStatsLogFile :: FilePath,
     serverStatsBackupFile :: Maybe FilePath,
     logTLSErrors :: Bool
@@ -73,7 +74,6 @@ data NtfEnv = NtfEnv
     store :: NtfStore,
     storeLog :: Maybe (StoreLog 'WriteMode),
     idsDrg :: TVar ChaChaDRG,
-    serverIdentity :: C.KeyHash,
     tlsServerParams :: T.ServerParams,
     serverIdentity :: C.KeyHash,
     serverStats :: NtfServerStats
@@ -93,7 +93,7 @@ newNtfServerEnv config@NtfServerConfig {subQSize, pushQSize, smpAgentCfg, apnsCo
 
 data NtfSubscriber = NtfSubscriber
   { smpSubscribers :: TMap SMPServer SMPSubscriber,
-    newSubQ :: TBQueue (NtfEntityRec 'Subscription),
+    newSubQ :: TBQueue [NtfEntityRec 'Subscription],
     smpAgent :: SMPClientAgent
   }
 
@@ -105,7 +105,7 @@ newNtfSubscriber qSize smpAgentCfg = do
   pure NtfSubscriber {smpSubscribers, newSubQ, smpAgent}
 
 data SMPSubscriber = SMPSubscriber
-  { newSubQ :: TQueue (NtfEntityRec 'Subscription),
+  { newSubQ :: TQueue (NonEmpty (NtfEntityRec 'Subscription)),
     subThreadId :: TVar (Maybe (Weak ThreadId))
   }
 
@@ -148,6 +148,7 @@ getPushClient s@NtfPushServer {pushClients} pp =
 data NtfRequest
   = NtfReqNew CorrId ANewNtfEntity
   | forall e. NtfEntityI e => NtfReqCmd (SNtfEntity e) (NtfEntityRec e) (Transmission (NtfCommand e))
+  | NtfReqPing CorrId NtfEntityId
 
 data NtfServerClient = NtfServerClient
   { rcvQ :: TBQueue NtfRequest,

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

@@ -14,7 +14,8 @@ import Data.Maybe (fromMaybe)
 import qualified Data.Text as T
 import Network.Socket (HostName)
 import Options.Applicative
-import Simplex.Messaging.Client.Agent (defaultSMPClientAgentConfig)
+import Simplex.Messaging.Client (ProtocolClientConfig (..))
+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 (..))
@@ -28,7 +29,10 @@ import System.IO (BufferMode (..), hSetBuffering, stderr, stdout)
 import Text.Read (readMaybe)
 
 ntfServerVersion :: String
-ntfServerVersion = "1.3.0"
+ntfServerVersion = "1.4.2"
+
+defaultSMPBatchDelay :: Int
+defaultSMPBatchDelay = 10000
 
 ntfServerCLI :: FilePath -> FilePath -> IO ()
 ntfServerCLI cfgPath logPath =
@@ -80,7 +84,9 @@ ntfServerCLI cfgPath logPath =
             <> ("host: " <> host <> "\n")
             <> ("port: " <> defaultServerPort <> "\n")
             <> "log_tls_errors: off\n\
-               \websockets: off\n"
+               \# delay between command batches sent to SMP relays (microseconds), 0 to disable\n"
+            <> ("smp_batch_delay: " <> show defaultSMPBatchDelay <> "\n")
+            <> "websockets: off\n"
     runServer ini = do
       hSetBuffering stdout LineBuffering
       hSetBuffering stderr LineBuffering
@@ -96,19 +102,20 @@ ntfServerCLI cfgPath logPath =
         enableStoreLog = settingIsOn "STORE_LOG" "enable" ini
         logStats = settingIsOn "STORE_LOG" "log_stats" ini
         c = combine cfgPath . ($ defaultX509Config)
+        smpBatchDelay = readIniDefault defaultSMPBatchDelay "TRANSPORT" "smp_batch_delay" ini
+        batchDelay = if smpBatchDelay <= 0 then Nothing else Just smpBatchDelay
         serverConfig =
           NtfServerConfig
             { transports = iniTransports ini,
               subIdBytes = 24,
               regCodeBytes = 32,
-              clientQSize = 16,
-              subQSize = 64,
-              pushQSize = 128,
-              smpAgentCfg = defaultSMPClientAgentConfig,
+              clientQSize = 64,
+              subQSize = 512,
+              pushQSize = 1048,
+              smpAgentCfg = defaultSMPClientAgentConfig {smpCfg = (smpCfg defaultSMPClientAgentConfig) {batchDelay}},
               apnsConfig = defaultAPNSPushClientConfig,
               inactiveClientExpiration = Nothing,
               storeLogFile = enableStoreLog $> storeLogFilePath,
-              resubscribeDelay = 50000, -- 50ms
               caCertificateFile = c caCrtFile,
               privateKeyFile = c serverKeyFile,
               certificateFile = c serverCrtFile,

src/Simplex/Messaging/Notifications/Server/Push/APNS.hs

@@ -32,10 +32,12 @@ import qualified Data.ByteString.Lazy.Char8 as LB
 import qualified Data.CaseInsensitive as CI
 import Data.Int (Int64)
 import Data.Map.Strict (Map)
+import Data.Maybe (isNothing)
 import Data.Text (Text)
 import qualified Data.Text as T
 import Data.Time.Clock.System
 import qualified Data.X509 as X
+import qualified Data.X509.CertificateStore as XS
 import GHC.Generics (Generic)
 import Network.HTTP.Types (HeaderName, Status)
 import qualified Network.HTTP.Types as N
@@ -47,6 +49,7 @@ import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Notifications.Protocol
 import Simplex.Messaging.Notifications.Server.Store (NtfTknData (..))
 import Simplex.Messaging.Protocol (EncNMsgMeta)
+import Simplex.Messaging.Transport.HTTP2 (HTTP2Body (..))
 import Simplex.Messaging.Transport.HTTP2.Client
 import Simplex.Messaging.Util (safeDecodeUtf8)
 import System.Environment (getEnv)
@@ -97,8 +100,8 @@ readECPrivateKey f = do
 data PushNotification
   = PNVerification NtfRegCode
   | PNMessage PNMessageData
-  -- | PNAlert Text
-  | PNCheckMessages
+  | -- | PNAlert Text
+    PNCheckMessages
   deriving (Show)
 
 data PNMessageData = PNMessageData
@@ -194,9 +197,9 @@ data APNSPushClientConfig = APNSPushClientConfig
     appName :: ByteString,
     appTeamId :: Text,
     apnsPort :: ServiceName,
-    http2cfg :: HTTP2ClientConfig
+    http2cfg :: HTTP2ClientConfig,
+    caStoreFile :: FilePath
   }
-  deriving (Show)
 
 apnsProviderHost :: PushProvider -> HostName
 apnsProviderHost = \case
@@ -215,7 +218,8 @@ defaultAPNSPushClientConfig =
       appName = "chat.simplex.app",
       appTeamId = "5NN7GUYB6T",
       apnsPort = "443",
-      http2cfg = defaultHTTP2ClientConfig
+      http2cfg = defaultHTTP2ClientConfig {bufferSize = 16384},
+      caStoreFile = "/etc/ssl/cert.pem"
     }
 
 data APNSPushClient = APNSPushClient
@@ -259,8 +263,10 @@ mkApnsJWTToken appTeamId jwtHeader privateKey = do
   pure (jwt, signedJWT)
 
 connectHTTPS2 :: HostName -> APNSPushClientConfig -> TVar (Maybe HTTP2Client) -> IO (Either HTTP2ClientError HTTP2Client)
-connectHTTPS2 apnsHost APNSPushClientConfig {apnsPort, http2cfg} https2Client = do
-  r <- getHTTP2Client apnsHost apnsPort http2cfg disconnected
+connectHTTPS2 apnsHost APNSPushClientConfig {apnsPort, http2cfg, caStoreFile} https2Client = do
+  caStore_ <- XS.readCertificateStore caStoreFile
+  when (isNothing caStore_) $ putStrLn $ "Error loading CertificateStore from " <> caStoreFile
+  r <- getHTTP2Client apnsHost apnsPort caStore_ http2cfg disconnected
   case r of
     Right client -> atomically . writeTVar https2Client $ Just client
     Left e -> putStrLn $ "Error connecting to APNS: " <> show e
@@ -294,7 +300,8 @@ apnsNotification NtfTknData {tknDhSecret} nonce paddedLen = \case
     encrypt ntfData f = f . safeDecodeUtf8 . U.encode <$> C.cbEncrypt tknDhSecret nonce ntfData paddedLen
     apn aps notificationData = APNSNotification {aps, notificationData}
     apnMutableContent = APNSMutableContent {mutableContent = 1, alert = APNSAlertText "Encrypted message or another app event", category = Just ntfCategoryCheckMessage}
-    -- apnAlert alert = APNSAlert {alert, badge = Nothing, sound = Nothing, category = Nothing}
+
+-- apnAlert alert = APNSAlert {alert, badge = Nothing, sound = Nothing, category = Nothing}
 
 apnsRequest :: APNSPushClient -> ByteString -> APNSNotification -> IO Request
 apnsRequest c tkn ntf@APNSNotification {aps} = do
@@ -336,9 +343,10 @@ apnsPushProviderClient c@APNSPushClient {nonceDrg, apnsCfg} tkn@NtfTknData {toke
   nonce <- atomically $ C.pseudoRandomCbNonce nonceDrg
   apnsNtf <- liftEither $ first PPCryptoError $ apnsNotification tkn nonce (paddedNtfLength apnsCfg) pn
   req <- liftIO $ apnsRequest c tknStr apnsNtf
-  HTTP2Response {response, respBody} <- liftHTTPS2 $ sendRequest http2 req
+  -- TODO when HTTP2 client is thread-safe, we can use sendRequestDirect
+  HTTP2Response {response, respBody = HTTP2Body {bodyHead}} <- liftHTTPS2 $ sendRequest http2 req Nothing
   let status = H.responseStatus response
-      reason' = maybe "" reason $ J.decodeStrict' respBody
+      reason' = maybe "" reason $ J.decodeStrict' bodyHead
   logDebug $ "APNS response: " <> T.pack (show status) <> " " <> reason'
   result status reason'
   where

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

@@ -70,14 +70,14 @@ getNtfServerStatsData s = do
 
 setNtfServerStats :: NtfServerStats -> NtfServerStatsData -> STM ()
 setNtfServerStats s d = do
-  writeTVar (fromTime (s :: NtfServerStats)) (_fromTime (d :: NtfServerStatsData))
-  writeTVar (tknCreated s) (_tknCreated d)
-  writeTVar (tknVerified s) (_tknVerified d)
-  writeTVar (tknDeleted s) (_tknDeleted d)
-  writeTVar (subCreated s) (_subCreated d)
-  writeTVar (subDeleted s) (_subDeleted d)
-  writeTVar (ntfReceived s) (_ntfReceived d)
-  writeTVar (ntfDelivered s) (_ntfDelivered d)
+  writeTVar (fromTime (s :: NtfServerStats)) $! _fromTime (d :: NtfServerStatsData)
+  writeTVar (tknCreated s) $! _tknCreated d
+  writeTVar (tknVerified s) $! _tknVerified d
+  writeTVar (tknDeleted s) $! _tknDeleted d
+  writeTVar (subCreated s) $! _subCreated d
+  writeTVar (subDeleted s) $! _subDeleted d
+  writeTVar (ntfReceived s) $! _ntfReceived d
+  writeTVar (ntfDelivered s) $! _ntfDelivered d
   setPeriodStats (activeTokens s) (_activeTokens d)
   setPeriodStats (activeSubs s) (_activeSubs d)
 

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

@@ -20,7 +20,7 @@ import qualified Data.Set as S
 import Data.Word (Word16)
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Notifications.Protocol
-import Simplex.Messaging.Protocol (NtfPrivateSignKey)
+import Simplex.Messaging.Protocol (NtfPrivateSignKey, SMPServer)
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
 import Simplex.Messaging.Util (whenM, ($>>=))
@@ -68,6 +68,9 @@ data NtfSubData = NtfSubData
     subStatus :: TVar NtfSubStatus
   }
 
+ntfSubServer :: NtfSubData -> SMPServer
+ntfSubServer NtfSubData {smpQueue = SMPQueueNtf {smpServer}} = smpServer
+
 data NtfEntityRec (e :: NtfEntity) where
   NtfTkn :: NtfTknData -> NtfEntityRec 'Token
   NtfSub :: NtfSubData -> NtfEntityRec 'Subscription

src/Simplex/Messaging/Protocol.hs

@@ -4,6 +4,7 @@
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE FlexibleInstances #-}
+{-# LANGUAGE FunctionalDependencies #-}
 {-# LANGUAGE GADTs #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE NamedFieldPuns #-}
@@ -19,11 +20,10 @@
 {-# LANGUAGE TypeFamilyDependencies #-}
 {-# LANGUAGE TypeOperators #-}
 {-# LANGUAGE UndecidableInstances #-}
+{-# HLINT ignore "Use newtype instead of data" #-}
 {-# OPTIONS_GHC -Wno-unrecognised-pragmas #-}
 {-# OPTIONS_GHC -fno-warn-unticked-promoted-constructors #-}
 
-{-# HLINT ignore "Use newtype instead of data" #-}
-
 -- |
 -- Module      : Simplex.Messaging.ProtocolEncoding
 -- Copyright   : (c) simplex.chat
@@ -52,6 +52,7 @@ module Simplex.Messaging.Protocol
     SParty (..),
     PartyI (..),
     QueueIdsKeys (..),
+    ProtocolErrorType (..),
     ErrorType (..),
     CommandError (..),
     Transmission,
@@ -64,8 +65,10 @@ module Simplex.Messaging.Protocol
     PrivHeader (..),
     Protocol (..),
     ProtocolType (..),
+    SProtocolType (..),
     AProtocolType (..),
     ProtocolTypeI (..),
+    UserProtocol,
     ProtocolServer (..),
     ProtoServer,
     SMPServer,
@@ -73,10 +76,15 @@ module Simplex.Messaging.Protocol
     SMPServerWithAuth,
     NtfServer,
     pattern NtfServer,
+    XFTPServer,
+    pattern XFTPServer,
+    XFTPServerWithAuth,
     ProtoServerWithAuth (..),
+    AProtoServerWithAuth (..),
     BasicAuth (..),
     SrvLoc (..),
     CorrId (..),
+    EntityId,
     QueueId,
     RecipientId,
     SenderId,
@@ -104,6 +112,7 @@ module Simplex.Messaging.Protocol
     SMPMsgMeta (..),
     NMsgMeta (..),
     MsgFlags (..),
+    userProtocol,
     rcvMessageMeta,
     noMsgFlags,
 
@@ -125,6 +134,10 @@ module Simplex.Messaging.Protocol
     -- * TCP transport functions
     tPut,
     tGet,
+    tParse,
+    tDecodeParseValidate,
+    tEncode,
+    tEncodeBatch,
 
     -- * exports for tests
     CommandTag (..),
@@ -133,6 +146,7 @@ module Simplex.Messaging.Protocol
 where
 
 import Control.Applicative (optional, (<|>))
+import Control.Concurrent (threadDelay)
 import Control.Monad.Except
 import Data.Aeson (FromJSON (..), ToJSON (..))
 import qualified Data.Aeson as J
@@ -141,6 +155,7 @@ import qualified Data.Attoparsec.ByteString.Char8 as A
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
 import Data.Char (isPrint, isSpace)
+import Data.Constraint (Dict (..))
 import Data.Functor (($>))
 import Data.Kind
 import Data.List.NonEmpty (NonEmpty (..))
@@ -150,7 +165,7 @@ import Data.String
 import Data.Time.Clock.System (SystemTime (..))
 import Data.Type.Equality
 import GHC.Generics (Generic)
-import GHC.TypeLits (type (+))
+import GHC.TypeLits (ErrorMessage (..), TypeError, type (+))
 import Generic.Random (genericArbitraryU)
 import Network.Socket (HostName, ServiceName)
 import qualified Simplex.Messaging.Crypto as C
@@ -159,7 +174,7 @@ import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Parsers
 import Simplex.Messaging.Transport
 import Simplex.Messaging.Transport.Client (TransportHost, TransportHosts (..))
-import Simplex.Messaging.Util (bshow, (<$?>))
+import Simplex.Messaging.Util (bshow, eitherToMaybe, (<$?>))
 import Simplex.Messaging.Version
 import Test.QuickCheck (Arbitrary (..))
 
@@ -219,7 +234,7 @@ deriving instance Show Cmd
 type Transmission c = (CorrId, EntityId, c)
 
 -- | signed parsed transmission, with original raw bytes and parsing error.
-type SignedTransmission c = (Maybe C.ASignature, Signed, Transmission (Either ErrorType c))
+type SignedTransmission e c = (Maybe C.ASignature, Signed, Transmission (Either e c))
 
 type Signed = ByteString
 
@@ -617,6 +632,15 @@ pattern NtfServer host port keyHash = ProtocolServer SPNTF host port keyHash
 
 {-# COMPLETE NtfServer #-}
 
+type XFTPServer = ProtocolServer 'PXFTP
+
+pattern XFTPServer :: NonEmpty TransportHost -> ServiceName -> C.KeyHash -> ProtocolServer 'PXFTP
+pattern XFTPServer host port keyHash = ProtocolServer SPXFTP host port keyHash
+
+{-# COMPLETE XFTPServer #-}
+
+type XFTPServerWithAuth = ProtoServerWithAuth 'PXFTP
+
 sameSrvAddr' :: ProtoServerWithAuth p -> ProtoServerWithAuth p -> Bool
 sameSrvAddr' (ProtoServerWithAuth srv _) (ProtoServerWithAuth srv' _) = sameSrvAddr srv srv'
 {-# INLINE sameSrvAddr' #-}
@@ -625,22 +649,25 @@ sameSrvAddr :: ProtocolServer p -> ProtocolServer p -> Bool
 sameSrvAddr ProtocolServer {host, port} ProtocolServer {host = h', port = p'} = host == h' && port == p'
 {-# INLINE sameSrvAddr #-}
 
-data ProtocolType = PSMP | PNTF
+data ProtocolType = PSMP | PNTF | PXFTP
   deriving (Eq, Ord, Show)
 
 instance StrEncoding ProtocolType where
   strEncode = \case
     PSMP -> "smp"
     PNTF -> "ntf"
+    PXFTP -> "xftp"
   strP =
     A.takeTill (\c -> c == ':' || c == ' ') >>= \case
       "smp" -> pure PSMP
       "ntf" -> pure PNTF
+      "xftp" -> pure PXFTP
       _ -> fail "bad ProtocolType"
 
 data SProtocolType (p :: ProtocolType) where
   SPSMP :: SProtocolType 'PSMP
   SPNTF :: SProtocolType 'PNTF
+  SPXFTP :: SProtocolType 'PXFTP
 
 deriving instance Eq (SProtocolType p)
 
@@ -658,17 +685,20 @@ instance Eq AProtocolType where
 instance TestEquality SProtocolType where
   testEquality SPSMP SPSMP = Just Refl
   testEquality SPNTF SPNTF = Just Refl
+  testEquality SPXFTP SPXFTP = Just Refl
   testEquality _ _ = Nothing
 
 protocolType :: SProtocolType p -> ProtocolType
 protocolType = \case
   SPSMP -> PSMP
   SPNTF -> PNTF
+  SPXFTP -> PXFTP
 
 aProtocolType :: ProtocolType -> AProtocolType
 aProtocolType = \case
   PSMP -> AProtocolType SPSMP
   PNTF -> AProtocolType SPNTF
+  PXFTP -> AProtocolType SPXFTP
 
 instance ProtocolTypeI p => StrEncoding (SProtocolType p) where
   strEncode = strEncode . protocolType
@@ -678,6 +708,10 @@ instance StrEncoding AProtocolType where
   strEncode (AProtocolType p) = strEncode p
   strP = aProtocolType <$> strP
 
+instance ProtocolTypeI p => ToJSON (SProtocolType p) where
+  toEncoding = strToJEncoding
+  toJSON = strToJSON
+
 instance ToJSON AProtocolType where
   toEncoding = strToJEncoding
   toJSON = strToJSON
@@ -694,6 +728,20 @@ instance ProtocolTypeI 'PSMP where protocolTypeI = SPSMP
 
 instance ProtocolTypeI 'PNTF where protocolTypeI = SPNTF
 
+instance ProtocolTypeI 'PXFTP where protocolTypeI = SPXFTP
+
+type family UserProtocol (p :: ProtocolType) :: Constraint where
+  UserProtocol PSMP = ()
+  UserProtocol PXFTP = ()
+  UserProtocol a =
+    (Int ~ Bool, TypeError (Text "Servers for protocol " :<>: ShowType a :<>: Text " cannot be configured by the users"))
+
+userProtocol :: SProtocolType p -> Maybe (Dict (UserProtocol p))
+userProtocol = \case
+  SPSMP -> Just Dict
+  SPXFTP -> Just Dict
+  _ -> Nothing
+
 -- | server location and transport key digest (hash).
 data ProtocolServer p = ProtocolServer
   { scheme :: SProtocolType p,
@@ -703,6 +751,8 @@ data ProtocolServer p = ProtocolServer
   }
   deriving (Eq, Ord, Show)
 
+data AProtocolServer = forall p. ProtocolTypeI p => AProtocolServer (SProtocolType p) (ProtocolServer p)
+
 instance ProtocolTypeI p => IsString (ProtocolServer p) where
   fromString = parseString strDecode
 
@@ -718,15 +768,18 @@ instance ProtocolTypeI p => StrEncoding (ProtocolServer p) where
     strEncodeServer scheme (strEncode host) port keyHash Nothing
   strP =
     serverStrP >>= \case
-      (srv, Nothing) -> pure srv
+      (AProtocolServer _ srv, Nothing) -> either fail pure $ checkProtocolType srv
       _ -> fail "ProtocolServer with basic auth not allowed"
 
 instance ProtocolTypeI p => ToJSON (ProtocolServer p) where
   toJSON = strToJSON
   toEncoding = strToJEncoding
 
+instance ProtocolTypeI p => FromJSON (ProtocolServer p) where
+  parseJSON = strParseJSON "ProtocolServer"
+
 newtype BasicAuth = BasicAuth {unBasicAuth :: ByteString}
-  deriving (Eq, Show)
+  deriving (Eq, Ord, Show)
 
 instance IsString BasicAuth where fromString = BasicAuth . B.pack
 
@@ -745,16 +798,26 @@ basicAuth s
   where
     valid c = isPrint c && not (isSpace c) && c /= '@' && c /= ':' && c /= '/'
 
-data ProtoServerWithAuth p = ProtoServerWithAuth (ProtocolServer p) (Maybe BasicAuth)
-  deriving (Show)
+data ProtoServerWithAuth p = ProtoServerWithAuth {protoServer :: ProtocolServer p, serverBasicAuth :: Maybe BasicAuth}
+  deriving (Eq, Ord, Show)
 
 instance ProtocolTypeI p => IsString (ProtoServerWithAuth p) where
   fromString = parseString strDecode
 
+data AProtoServerWithAuth = forall p. ProtocolTypeI p => AProtoServerWithAuth (SProtocolType p) (ProtoServerWithAuth p)
+
+deriving instance Show AProtoServerWithAuth
+
 instance ProtocolTypeI p => StrEncoding (ProtoServerWithAuth p) where
   strEncode (ProtoServerWithAuth ProtocolServer {scheme, host, port, keyHash} auth_) =
     strEncodeServer scheme (strEncode host) port keyHash auth_
-  strP = uncurry ProtoServerWithAuth <$> serverStrP
+  strP = (\(AProtoServerWithAuth _ srv) -> checkProtocolType srv) <$?> strP
+
+instance StrEncoding AProtoServerWithAuth where
+  strEncode (AProtoServerWithAuth _ srv) = strEncode srv
+  strP =
+    serverStrP >>= \(AProtocolServer p srv, auth) ->
+      pure $ AProtoServerWithAuth p (ProtoServerWithAuth srv auth)
 
 instance ProtocolTypeI p => ToJSON (ProtoServerWithAuth p) where
   toJSON = strToJSON
@@ -763,6 +826,13 @@ instance ProtocolTypeI p => ToJSON (ProtoServerWithAuth p) where
 instance ProtocolTypeI p => FromJSON (ProtoServerWithAuth p) where
   parseJSON = strParseJSON "ProtoServerWithAuth"
 
+instance ToJSON AProtoServerWithAuth where
+  toJSON = strToJSON
+  toEncoding = strToJEncoding
+
+instance FromJSON AProtoServerWithAuth where
+  parseJSON = strParseJSON "AProtoServerWithAuth"
+
 noAuthSrv :: ProtocolServer p -> ProtoServerWithAuth p
 noAuthSrv srv = ProtoServerWithAuth srv Nothing
 
@@ -785,14 +855,15 @@ strEncodeServer scheme host port keyHash auth_ =
   where
     portStr = B.pack $ if null port then "" else ':' : port
 
-serverStrP :: ProtocolTypeI p => Parser (ProtocolServer p, Maybe BasicAuth)
+serverStrP :: Parser (AProtocolServer, Maybe BasicAuth)
 serverStrP = do
   scheme <- strP <* "://"
   keyHash <- strP
   auth_ <- optional $ A.char ':' *> strP
   TransportHosts host <- A.char '@' *> strP
   port <- portP <|> pure ""
-  pure (ProtocolServer {scheme, host, port, keyHash}, auth_)
+  pure $ case scheme of
+    AProtocolType s -> (AProtocolServer s $ ProtocolServer {scheme = s, host, port, keyHash}, auth_)
   where
     portP = show <$> (A.char ':' *> (A.decimal :: Parser Int))
 
@@ -869,6 +940,8 @@ type MsgId = ByteString
 -- | SMP message body.
 type MsgBody = ByteString
 
+data ProtocolErrorType = PECmdSyntax | PECmdUnknown | PESession | PEBlock
+
 -- | Type for protocol errors.
 data ErrorType
   = -- | incorrect block format, encoding or signature size
@@ -939,16 +1012,16 @@ transmissionP = do
       command <- A.takeByteString
       pure RawTransmission {signature, signed, sessId, corrId, entityId, command}
 
-class (ProtocolEncoding msg, ProtocolEncoding (ProtoCommand msg), Show msg) => Protocol msg where
+class (ProtocolEncoding err msg, ProtocolEncoding err (ProtoCommand msg), Show err, Show msg) => Protocol err msg | msg -> err where
   type ProtoCommand msg = cmd | cmd -> msg
   type ProtoType msg = (sch :: ProtocolType) | sch -> msg
   protocolClientHandshake :: forall c. Transport c => c -> C.KeyHash -> VersionRange -> ExceptT TransportError IO (THandle c)
   protocolPing :: ProtoCommand msg
-  protocolError :: msg -> Maybe ErrorType
+  protocolError :: msg -> Maybe err
 
 type ProtoServer msg = ProtocolServer (ProtoType msg)
 
-instance Protocol BrokerMsg where
+instance Protocol ErrorType BrokerMsg where
   type ProtoCommand BrokerMsg = Cmd
   type ProtoType BrokerMsg = 'PSMP
   protocolClientHandshake = smpClientHandshake
@@ -957,13 +1030,14 @@ instance Protocol BrokerMsg where
     ERR e -> Just e
     _ -> Nothing
 
-class ProtocolMsgTag (Tag msg) => ProtocolEncoding msg where
+class ProtocolMsgTag (Tag msg) => ProtocolEncoding err msg | msg -> err where
   type Tag msg
   encodeProtocol :: Version -> msg -> ByteString
   protocolP :: Version -> Tag msg -> Parser msg
-  checkCredentials :: SignedRawTransmission -> msg -> Either ErrorType msg
+  fromProtocolError :: ProtocolErrorType -> err
+  checkCredentials :: SignedRawTransmission -> msg -> Either err msg
 
-instance PartyI p => ProtocolEncoding (Command p) where
+instance PartyI p => ProtocolEncoding ErrorType (Command p) where
   type Tag (Command p) = CommandTag p
   encodeProtocol v = \case
     NEW rKey dhKey auth_ -> case auth_ of
@@ -994,6 +1068,9 @@ instance PartyI p => ProtocolEncoding (Command p) where
 
   protocolP v tag = (\(Cmd _ c) -> checkParty c) <$?> protocolP v (CT (sParty @p) tag)
 
+  fromProtocolError = fromProtocolError @ErrorType @BrokerMsg
+  {-# INLINE fromProtocolError #-}
+
   checkCredentials (sig, _, queueId, _) cmd = case cmd of
     -- NEW must have signature but NOT queue ID
     NEW {}
@@ -1013,7 +1090,7 @@ instance PartyI p => ProtocolEncoding (Command p) where
       | isNothing sig || B.null queueId -> Left $ CMD NO_AUTH
       | otherwise -> Right cmd
 
-instance ProtocolEncoding Cmd where
+instance ProtocolEncoding ErrorType Cmd where
   type Tag Cmd = CmdTag
   encodeProtocol v (Cmd _ c) = encodeProtocol v c
 
@@ -1043,9 +1120,12 @@ instance ProtocolEncoding Cmd where
         PING_ -> pure PING
     CT SNotifier NSUB_ -> pure $ Cmd SNotifier NSUB
 
+  fromProtocolError = fromProtocolError @ErrorType @BrokerMsg
+  {-# INLINE fromProtocolError #-}
+
   checkCredentials t (Cmd p c) = Cmd p <$> checkCredentials t c
 
-instance ProtocolEncoding BrokerMsg where
+instance ProtocolEncoding ErrorType BrokerMsg where
   type Tag BrokerMsg = BrokerMsgTag
   encodeProtocol v = \case
     IDS (QIK rcvId sndId srvDh) -> e (IDS_, ' ', rcvId, sndId, srvDh)
@@ -1080,6 +1160,13 @@ instance ProtocolEncoding BrokerMsg where
     ERR_ -> ERR <$> _smpP
     PONG_ -> pure PONG
 
+  fromProtocolError = \case
+    PECmdSyntax -> CMD SYNTAX
+    PECmdUnknown -> CMD UNKNOWN
+    PESession -> SESSION
+    PEBlock -> BLOCK
+  {-# INLINE fromProtocolError #-}
+
   checkCredentials (_, _, queueId, _) cmd = case cmd of
     -- IDS response should not have queue ID
     IDS _ -> Right cmd
@@ -1098,12 +1185,12 @@ _smpP :: Encoding a => Parser a
 _smpP = A.space *> smpP
 
 -- | Parse SMP protocol commands and broker messages
-parseProtocol :: ProtocolEncoding msg => Version -> ByteString -> Either ErrorType msg
+parseProtocol :: forall err msg. ProtocolEncoding err msg => Version -> ByteString -> Either err msg
 parseProtocol v s =
   let (tag, params) = B.break (== ' ') s
    in case decodeTag tag of
-        Just cmd -> parse (protocolP v cmd) (CMD SYNTAX) params
-        Nothing -> Left $ CMD UNKNOWN
+        Just cmd -> parse (protocolP v cmd) (fromProtocolError @err @msg $ PECmdSyntax) params
+        Nothing -> Left $ fromProtocolError @err @msg $ PECmdUnknown
 
 checkParty :: forall t p p'. (PartyI p, PartyI p') => t p' -> Either String (t p)
 checkParty c = case testEquality (sParty @p) (sParty @p') of
@@ -1111,9 +1198,7 @@ checkParty c = case testEquality (sParty @p) (sParty @p') of
   Nothing -> Left "bad command party"
 
 checkParty' :: forall t p p'. (PartyI p, PartyI p') => t p' -> Maybe (t p)
-checkParty' c = case testEquality (sParty @p) (sParty @p') of
-  Just Refl -> Just c
-  _ -> Nothing
+checkParty' = eitherToMaybe . checkParty
 
 instance Encoding ErrorType where
   smpEncode = \case
@@ -1160,18 +1245,18 @@ instance Encoding CommandError where
       _ -> fail "bad command error type"
 
 -- | Send signed SMP transmission to TCP transport.
-tPut :: Transport c => THandle c -> NonEmpty SentRawTransmission -> IO [Either TransportError ()]
-tPut th trs
+tPut :: Transport c => THandle c -> Maybe Int -> NonEmpty SentRawTransmission -> IO [Either TransportError ()]
+tPut th delay_ trs 
   | batch th = tPutBatch [] $ L.map tEncode trs
   | otherwise = forM (L.toList trs) $ tPutLog . tEncode
   where
     tPutBatch :: [Either TransportError ()] -> NonEmpty ByteString -> IO [Either TransportError ()]
     tPutBatch rs ts = do
       let (n, s, ts_) = encodeBatch 0 "" ts
-      r <- if n == 0 then largeMsg else replicate n <$> tPutLog (lenEncode n `B.cons` s)
+      r <- if n == 0 then largeMsg else replicate n <$> tPutLog (tEncodeBatch n s)
       let rs' = rs <> r
       case ts_ of
-        Just ts' -> tPutBatch rs' ts'
+        Just ts' -> mapM_ threadDelay delay_ >> tPutBatch rs' ts'
         _ -> pure rs'
     largeMsg = putStrLn "tPut error: large message" >> pure [Left TELargeMsg]
     tPutLog s = do
@@ -1191,41 +1276,49 @@ tPut th trs
               else case L.nonEmpty ts_ of
                 Just ts' -> encodeBatch n' s' ts'
                 _ -> (n', s', Nothing)
-    tEncode (sig, tr) = smpEncode (C.signatureBytes sig) <> tr
 
-encodeTransmission :: ProtocolEncoding c => Version -> ByteString -> Transmission c -> ByteString
+tEncode :: (Maybe C.ASignature, ByteString) -> ByteString
+tEncode (sig, t) = smpEncode (C.signatureBytes sig) <> t
+
+tEncodeBatch :: Int -> ByteString -> ByteString
+tEncodeBatch n s = lenEncode n `B.cons` s
+
+encodeTransmission :: ProtocolEncoding e c => Version -> ByteString -> Transmission c -> ByteString
 encodeTransmission v sessionId (CorrId corrId, queueId, command) =
   smpEncode (sessionId, corrId, queueId) <> encodeProtocol v command
 
 -- | Receive and parse transmission from the TCP transport (ignoring any trailing padding).
 tGetParse :: Transport c => THandle c -> IO (NonEmpty (Either TransportError RawTransmission))
-tGetParse th
-  | batch th = either ((:| []) . Left) id <$> runExceptT getBatch
-  | otherwise = (:| []) . (parse transmissionP TEBadBlock =<<) <$> tGetBlock th
+tGetParse th = eitherList (tParse $ batch th) <$> tGetBlock th
+
+tParse :: Bool -> ByteString -> NonEmpty (Either TransportError RawTransmission)
+tParse batch s
+  | batch = eitherList (L.map (\(Large t) -> tParse1 t)) ts
+  | otherwise = [tParse1 s]
   where
-    getBatch :: ExceptT TransportError IO (NonEmpty (Either TransportError RawTransmission))
-    getBatch = do
-      s <- ExceptT $ tGetBlock th
-      ts <- liftEither $ parse smpP TEBadBlock s
-      pure $ L.map (\(Large t) -> parse transmissionP TEBadBlock t) ts
+    tParse1 = parse transmissionP TEBadBlock
+    ts = parse smpP TEBadBlock s
+
+eitherList :: (a -> NonEmpty (Either e b)) -> Either e a -> NonEmpty (Either e b)
+eitherList = either (\e -> [Left e])
 
 -- | Receive client and server transmissions (determined by `cmd` type).
-tGet :: forall cmd c m. (ProtocolEncoding cmd, Transport c, MonadIO m) => THandle c -> m (NonEmpty (SignedTransmission cmd))
-tGet th@THandle {sessionId, thVersion = v} = liftIO (tGetParse th) >>= mapM decodeParseValidate
+tGet :: forall err cmd c. (ProtocolEncoding err cmd, Transport c) => THandle c -> IO (NonEmpty (SignedTransmission err cmd))
+tGet th@THandle {sessionId, thVersion = v} = L.map (tDecodeParseValidate sessionId v) <$> tGetParse th
+
+tDecodeParseValidate :: forall err cmd. ProtocolEncoding err cmd => SessionId -> Version -> Either TransportError RawTransmission -> SignedTransmission err cmd
+tDecodeParseValidate sessionId v = \case
+  Right RawTransmission {signature, signed, sessId, corrId, entityId, command}
+    | sessId == sessionId ->
+      let decodedTransmission = (,corrId,entityId,command) <$> C.decodeSignature signature
+       in either (const $ tError corrId) (tParseValidate signed) decodedTransmission
+    | otherwise -> (Nothing, "", (CorrId corrId, "", Left $ fromProtocolError @err @cmd PESession))
+  Left _ -> tError ""
   where
-    decodeParseValidate :: Either TransportError RawTransmission -> m (SignedTransmission cmd)
-    decodeParseValidate = \case
-      Right RawTransmission {signature, signed, sessId, corrId, entityId, command}
-        | sessId == sessionId ->
-          let decodedTransmission = (,corrId,entityId,command) <$> C.decodeSignature signature
-           in either (const $ tError corrId) (tParseValidate signed) decodedTransmission
-        | otherwise -> pure (Nothing, "", (CorrId corrId, "", Left SESSION))
-      Left _ -> tError ""
+    tError :: ByteString -> SignedTransmission err cmd
+    tError corrId = (Nothing, "", (CorrId corrId, "", Left $ fromProtocolError @err @cmd PEBlock))
 
-    tError :: ByteString -> m (SignedTransmission cmd)
-    tError corrId = pure (Nothing, "", (CorrId corrId, "", Left BLOCK))
-
-    tParseValidate :: ByteString -> SignedRawTransmission -> m (SignedTransmission cmd)
-    tParseValidate signed t@(sig, corrId, entityId, command) = do
-      let cmd = parseProtocol v command >>= checkCredentials t
-      pure (sig, signed, (CorrId corrId, entityId, cmd))
+    tParseValidate :: ByteString -> SignedRawTransmission -> SignedTransmission err cmd
+    tParseValidate signed t@(sig, corrId, entityId, command) =
+      let cmd = parseProtocol @err @cmd v command >>= checkCredentials t
+       in (sig, signed, (CorrId corrId, entityId, cmd))

src/Simplex/Messaging/Server.hs

@@ -46,6 +46,7 @@ import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
 import Data.Either (fromRight, partitionEithers)
 import Data.Functor (($>))
+import Data.Int (Int64)
 import Data.List (intercalate)
 import qualified Data.List.NonEmpty as L
 import qualified Data.Map.Strict as M
@@ -65,9 +66,9 @@ import Simplex.Messaging.Protocol
 import Simplex.Messaging.Server.Env.STM
 import Simplex.Messaging.Server.Expiration
 import Simplex.Messaging.Server.MsgStore
-import Simplex.Messaging.Server.MsgStore.STM (MsgQueue)
+import Simplex.Messaging.Server.MsgStore.STM
 import Simplex.Messaging.Server.QueueStore
-import Simplex.Messaging.Server.QueueStore.STM (QueueStore)
+import Simplex.Messaging.Server.QueueStore.STM
 import Simplex.Messaging.Server.Stats
 import Simplex.Messaging.Server.StoreLog
 import Simplex.Messaging.TMap (TMap)
@@ -104,8 +105,8 @@ type M a = ReaderT Env IO a
 smpServer :: TMVar Bool -> ServerConfig -> M ()
 smpServer started cfg@ServerConfig {transports, logTLSErrors} = do
   s <- asks server
-  restoreServerStats
   restoreServerMessages
+  restoreServerStats
   raceAny_
     ( serverThread s subscribedQ subscribers subscriptions cancelSub :
       serverThread s ntfSubscribedQ notifiers ntfSubscriptions (\_ -> pure ()) :
@@ -157,7 +158,7 @@ smpServer started cfg@ServerConfig {transports, logTLSErrors} = do
       quota <- asks $ msgQueueQuota . config
       let interval = checkInterval expCfg * 1000000
       forever $ do
-        threadDelay interval
+        liftIO $ threadDelay' interval
         old <- liftIO $ expireBeforeEpoch expCfg
         rIds <- M.keysSet <$> readTVarIO ms
         forM_ rIds $ \rId ->
@@ -169,12 +170,12 @@ smpServer started cfg@ServerConfig {transports, logTLSErrors} = do
       [logServerStats logStatsStartTime interval serverStatsLogFile]
     serverStatsThread_ _ = []
 
-    logServerStats :: Int -> Int -> FilePath -> M ()
+    logServerStats :: Int64 -> Int64 -> FilePath -> M ()
     logServerStats startAt logInterval statsFilePath = do
       initialDelay <- (startAt -) . fromIntegral . (`div` 1000000_000000) . diffTimeToPicoseconds . utctDayTime <$> liftIO getCurrentTime
       liftIO $ putStrLn $ "server stats log enabled: " <> statsFilePath
-      threadDelay $ 1000000 * (initialDelay + if initialDelay < 0 then 86400 else 0)
-      ServerStats {fromTime, qCreated, qSecured, qDeleted, msgSent, msgRecv, activeQueues} <- asks serverStats
+      liftIO $ threadDelay' $ 1000000 * (initialDelay + if initialDelay < 0 then 86400 else 0)
+      ServerStats {fromTime, qCreated, qSecured, qDeleted, msgSent, msgRecv, activeQueues, msgSentNtf, msgRecvNtf, activeQueuesNtf, qCount, msgCount} <- asks serverStats
       let interval = 1000000 * logInterval
       withFile statsFilePath AppendMode $ \h -> liftIO $ do
         hSetBuffering h LineBuffering
@@ -187,8 +188,32 @@ smpServer started cfg@ServerConfig {transports, logTLSErrors} = do
           msgSent' <- atomically $ swapTVar msgSent 0
           msgRecv' <- atomically $ swapTVar msgRecv 0
           ps <- atomically $ periodStatCounts activeQueues ts
-          hPutStrLn h $ intercalate "," [iso8601Show $ utctDay fromTime', show qCreated', show qSecured', show qDeleted', show msgSent', show msgRecv', dayCount ps, weekCount ps, monthCount ps]
-          threadDelay interval
+          msgSentNtf' <- atomically $ swapTVar msgSentNtf 0
+          msgRecvNtf' <- atomically $ swapTVar msgRecvNtf 0
+          psNtf <- atomically $ periodStatCounts activeQueuesNtf ts
+          qCount' <- readTVarIO qCount
+          msgCount' <- readTVarIO msgCount
+          hPutStrLn h $
+            intercalate
+              ","
+              [ iso8601Show $ utctDay fromTime',
+                show qCreated',
+                show qSecured',
+                show qDeleted',
+                show msgSent',
+                show msgRecv',
+                dayCount ps,
+                weekCount ps,
+                monthCount ps,
+                show msgSentNtf',
+                show msgRecvNtf',
+                dayCount psNtf,
+                weekCount psNtf,
+                monthCount psNtf,
+                show qCount',
+                show msgCount'
+              ]
+          threadDelay' interval
 
     runClient :: Transport c => TProxy c -> c -> M ()
     runClient _ h = do
@@ -236,13 +261,13 @@ cancelSub sub =
 
 receive :: Transport c => THandle c -> Client -> M ()
 receive th Client {rcvQ, sndQ, activeAt} = forever $ do
-  ts <- L.toList <$> tGet th
+  ts <- L.toList <$> liftIO (tGet th)
   atomically . writeTVar activeAt =<< liftIO getSystemTime
   as <- partitionEithers <$> mapM cmdAction ts
   write sndQ $ fst as
   write rcvQ $ snd as
   where
-    cmdAction :: SignedTransmission Cmd -> M (Either (Transmission BrokerMsg) (Maybe QueueRec, Transmission Cmd))
+    cmdAction :: SignedTransmission ErrorType Cmd -> M (Either (Transmission BrokerMsg) (Maybe QueueRec, Transmission Cmd))
     cmdAction (sig, signed, (corrId, queueId, cmdOrError)) =
       case cmdOrError of
         Left e -> pure $ Left (corrId, queueId, ERR e)
@@ -256,7 +281,7 @@ receive th Client {rcvQ, sndQ, activeAt} = forever $ do
 send :: Transport c => THandle c -> Client -> IO ()
 send h@THandle {thVersion = v} Client {sndQ, sessionId, activeAt} = forever $ do
   ts <- atomically $ L.sortWith tOrder <$> readTBQueue sndQ
-  void . liftIO . tPut h $ L.map ((Nothing,) . encodeTransmission v sessionId) ts
+  void . liftIO . tPut h Nothing $ L.map ((Nothing,) . encodeTransmission v sessionId) ts
   atomically . writeTVar activeAt =<< liftIO getSystemTime
   where
     tOrder :: Transmission BrokerMsg -> Int
@@ -268,7 +293,7 @@ disconnectTransport :: Transport c => THandle c -> client -> (client -> TVar Sys
 disconnectTransport THandle {connection} c activeAt expCfg = do
   let interval = checkInterval expCfg * 1000000
   forever . liftIO $ do
-    threadDelay interval
+    threadDelay' interval
     old <- expireBeforeEpoch expCfg
     ts <- readTVarIO $ activeAt c
     when (systemSeconds ts < old) $ closeConnection connection
@@ -276,7 +301,7 @@ disconnectTransport THandle {connection} c activeAt expCfg = do
 data VerificationResult = VRVerified (Maybe QueueRec) | VRFailed
 
 verifyTransmission :: Maybe C.ASignature -> ByteString -> QueueId -> Cmd -> M VerificationResult
-verifyTransmission sig_ signed queueId cmd = do
+verifyTransmission sig_ signed queueId cmd =
   case cmd of
     Cmd SRecipient (NEW k _ _) -> pure $ Nothing `verified` verifyCmdSignature sig_ signed k
     Cmd SRecipient _ -> verifyCmd SRecipient $ verifyCmdSignature sig_ signed . recipientKey
@@ -287,7 +312,7 @@ verifyTransmission sig_ signed queueId cmd = do
     verifyCmd :: SParty p -> (QueueRec -> Bool) -> M VerificationResult
     verifyCmd party f = do
       st <- asks queueStore
-      q_ <- atomically (getQueue st party queueId)
+      q_ <- atomically $ getQueue st party queueId
       pure $ case q_ of
         Right q -> Just q `verified` f q
         _ -> maybe False (dummyVerifyCmd signed) sig_ `seq` VRFailed
@@ -386,7 +411,8 @@ client clnt@Client {thVersion, subscriptions, ntfSubscriptions, rcvQ, sndQ} Serv
                 Right _ -> do
                   withLog (`logCreateById` rId)
                   stats <- asks serverStats
-                  atomically $ modifyTVar (qCreated stats) (+ 1)
+                  atomically $ modifyTVar' (qCreated stats) (+ 1)
+                  atomically $ modifyTVar' (qCount stats) (+ 1)
                   subscribeQueue qr rId $> IDS (qik ids)
 
             logCreateById :: StoreLog 'WriteMode -> RecipientId -> IO ()
@@ -404,7 +430,7 @@ client clnt@Client {thVersion, subscriptions, ntfSubscriptions, rcvQ, sndQ} Serv
         secureQueue_ st sKey = time "KEY" $ do
           withLog $ \s -> logSecureQueue s queueId sKey
           stats <- asks serverStats
-          atomically $ modifyTVar (qSecured stats) (+ 1)
+          atomically $ modifyTVar' (qSecured stats) (+ 1)
           atomically $ (corrId,queueId,) . either ERR (const OK) <$> secureQueue st queueId sKey
 
         addQueueNotifier_ :: QueueStore -> NtfPublicVerifyKey -> RcvNtfPublicDhKey -> m (Transmission BrokerMsg)
@@ -509,12 +535,12 @@ client clnt@Client {thVersion, subscriptions, ntfSubscriptions, rcvQ, sndQ} Serv
                   q <- getStoreMsgQueue "ACK" queueId
                   case s of
                     Sub {subThread = ProhibitSub} -> do
-                      msgDeleted <- atomically $ tryDelMsg q msgId
-                      when msgDeleted updateStats
+                      deletedMsg_ <- atomically $ tryDelMsg q msgId
+                      mapM_ updateStats deletedMsg_
                       pure ok
                     _ -> do
-                      (msgDeleted, msg_) <- atomically $ tryDelPeekMsg q msgId
-                      when msgDeleted updateStats
+                      (deletedMsg_, msg_) <- atomically $ tryDelPeekMsg q msgId
+                      mapM_ updateStats deletedMsg_
                       deliverMessage "ACK" qr queueId sub q msg_
                 _ -> pure $ err NO_MSG
           where
@@ -525,11 +551,17 @@ client clnt@Client {thVersion, subscriptions, ntfSubscriptions, rcvQ, sndQ} Serv
                 if msgId == msgId' || B.null msgId
                   then pure $ Just s
                   else putTMVar delivered msgId' $> Nothing
-            updateStats :: m ()
-            updateStats = do
-              stats <- asks serverStats
-              atomically $ modifyTVar (msgRecv stats) (+ 1)
-              atomically $ updatePeriodStats (activeQueues stats) queueId
+            updateStats :: Message -> m ()
+            updateStats = \case
+              MessageQuota {} -> pure ()
+              Message {msgFlags} -> do
+                stats <- asks serverStats
+                atomically $ modifyTVar' (msgRecv stats) (+ 1)
+                atomically $ modifyTVar' (msgCount stats) (+ 1)
+                atomically $ updatePeriodStats (activeQueues stats) queueId
+                when (notification msgFlags) $ do
+                  atomically $ modifyTVar' (msgRecvNtf stats) (+ 1)
+                  atomically $ updatePeriodStats (activeQueuesNtf stats) queueId
 
         sendMessage :: QueueRec -> MsgFlags -> MsgBody -> m (Transmission BrokerMsg)
         sendMessage qr msgFlags msgBody
@@ -547,10 +579,13 @@ client clnt@Client {thVersion, subscriptions, ntfSubscriptions, rcvQ, sndQ} Serv
                   case msg_ of
                     Nothing -> pure $ err QUOTA
                     Just msg -> time "SEND ok" $ do
-                      when (notification msgFlags) $
-                        atomically . trySendNotification msg =<< asks idsDrg
                       stats <- asks serverStats
-                      atomically $ modifyTVar (msgSent stats) (+ 1)
+                      when (notification msgFlags) $ do
+                        atomically . trySendNotification msg =<< asks idsDrg
+                        atomically $ modifyTVar' (msgSentNtf stats) (+ 1)
+                        atomically $ updatePeriodStats (activeQueuesNtf stats) (recipientId qr)
+                      atomically $ modifyTVar' (msgSent stats) (+ 1)
+                      atomically $ modifyTVar' (msgCount stats) (subtract 1)
                       atomically $ updatePeriodStats (activeQueues stats) (recipientId qr)
                       pure ok
           where
@@ -599,9 +634,9 @@ client clnt@Client {thVersion, subscriptions, ntfSubscriptions, rcvQ, sndQ} Serv
           where
             forkSub :: m ()
             forkSub = do
-              atomically . modifyTVar sub $ \s -> s {subThread = SubPending}
+              atomically . modifyTVar' sub $ \s -> s {subThread = SubPending}
               t <- mkWeakThreadId =<< forkIO subscriber
-              atomically . modifyTVar sub $ \case
+              atomically . modifyTVar' sub $ \case
                 s@Sub {subThread = SubPending} -> s {subThread = SubThread t}
                 s -> s
               where
@@ -612,7 +647,7 @@ client clnt@Client {thVersion, subscriptions, ntfSubscriptions, rcvQ, sndQ} Serv
                     writeTBQueue sndQ [(CorrId "", rId, MSG encMsg)]
                     s <- readTVar sub
                     void $ setDelivered s msg
-                    writeTVar sub s {subThread = NoSub}
+                    writeTVar sub $! s {subThread = NoSub}
 
         time :: T.Text -> m a -> m a
         time name = timed name queueId
@@ -646,7 +681,8 @@ client clnt@Client {thVersion, subscriptions, ntfSubscriptions, rcvQ, sndQ} Serv
           withLog (`logDeleteQueue` queueId)
           ms <- asks msgStore
           stats <- asks serverStats
-          atomically $ modifyTVar (qDeleted stats) (+ 1)
+          atomically $ modifyTVar' (qDeleted stats) (+ 1)
+          atomically $ modifyTVar' (qCount stats) (subtract 1)
           atomically $
             deleteQueue st queueId >>= \case
               Left e -> pure $ err e
@@ -705,7 +741,8 @@ restoreServerMessages = asks (storeMsgsFile . config) >>= mapM_ restoreMessages
       st <- asks queueStore
       ms <- asks msgStore
       quota <- asks $ msgQueueQuota . config
-      runExceptT (liftIO (B.readFile f) >>= mapM_ (restoreMsg st ms quota) . B.lines) >>= \case
+      old_ <- asks (messageExpiration . config) $>>= (liftIO . fmap Just . expireBeforeEpoch)
+      runExceptT (liftIO (B.readFile f) >>= mapM_ (restoreMsg st ms quota old_) . B.lines) >>= \case
         Left e -> do
           logError . T.pack $ "error restoring messages: " <> e
           liftIO exitFailure
@@ -713,7 +750,7 @@ restoreServerMessages = asks (storeMsgsFile . config) >>= mapM_ restoreMessages
           renameFile f $ f <> ".bak"
           logInfo "messages restored"
       where
-        restoreMsg st ms quota s = do
+        restoreMsg st ms quota old_ s = do
           r <- liftEither . first (msgErr "parsing") $ strDecode s
           case r of
             MLRv3 rId msg -> addToMsgQueue rId msg
@@ -723,10 +760,14 @@ restoreServerMessages = asks (storeMsgsFile . config) >>= mapM_ restoreMessages
               addToMsgQueue rId msg'
           where
             addToMsgQueue rId msg = do
-              full <- atomically $ do
+              logFull <- atomically $ do
                 q <- getMsgQueue ms rId quota
-                isNothing <$> writeMsg q msg
-              when full . logError . decodeLatin1 $ "message queue " <> strEncode rId <> " is full, message not restored: " <> strEncode (msgId (msg :: Message))
+                case msg of
+                  Message {msgTs}
+                    | maybe True (systemSeconds msgTs >=) old_ -> isNothing <$> writeMsg q msg
+                    | otherwise -> pure False
+                  MessageQuota {} -> writeMsg q msg $> False
+              when logFull . logError . decodeLatin1 $ "message queue " <> strEncode rId <> " is full, message not restored: " <> strEncode (msgId (msg :: Message))
             updateMsgV1toV3 QueueRec {rcvDhSecret} RcvMessage {msgId, msgTs, msgFlags, msgBody = EncRcvMsgBody body} = do
               let nonce = C.cbNonce msgId
               msgBody <- liftEither . first (msgErr "v1 message decryption") $ C.maxLenBS =<< C.cbDecrypt rcvDhSecret nonce body
@@ -752,7 +793,9 @@ restoreServerStats = asks (serverStatsBackupFile . config) >>= mapM_ restoreStat
       liftIO (strDecode <$> B.readFile f) >>= \case
         Right d -> do
           s <- asks serverStats
-          atomically $ setServerStats s d
+          _qCount <- fmap (length . M.keys) . readTVarIO . queues =<< asks queueStore
+          _msgCount <- foldM (\n q -> (n +) <$> readTVarIO (size q)) 0 =<< readTVarIO =<< asks msgStore
+          atomically $ setServerStats s d {_qCount, _msgCount}
           renameFile f $ f <> ".bak"
           logInfo "server stats restored"
         Left e -> do

src/Simplex/Messaging/Server/CLI.hs

@@ -16,6 +16,7 @@ import Data.Either (fromRight)
 import Data.Ini (Ini, lookupValue)
 import Data.Text (Text)
 import qualified Data.Text as T
+import Data.Text.Encoding (encodeUtf8)
 import Data.X509.Validation (Fingerprint (..))
 import Network.Socket (HostName, ServiceName)
 import Options.Applicative
@@ -24,7 +25,7 @@ import Simplex.Messaging.Protocol (ProtoServerWithAuth (..), ProtocolServer (..)
 import Simplex.Messaging.Transport (ATransport (..), TLS, Transport (..))
 import Simplex.Messaging.Transport.Server (loadFingerprint)
 import Simplex.Messaging.Transport.WebSockets (WS)
-import Simplex.Messaging.Util (whenM)
+import Simplex.Messaging.Util (eitherToMaybe, whenM)
 import System.Directory (doesDirectoryExist, listDirectory, removeDirectoryRecursive, removePathForcibly)
 import System.Exit (exitFailure)
 import System.FilePath (combine)
@@ -163,6 +164,9 @@ strictIni section key ini =
 readStrictIni :: Read a => Text -> Text -> Ini -> a
 readStrictIni section key = read . T.unpack . strictIni section key
 
+readIniDefault :: Read a => a -> Text -> Text -> Ini -> a
+readIniDefault def section key = either (const def) (read . T.unpack) . lookupValue section key
+
 iniOnOff :: Text -> Text -> Ini -> Maybe Bool
 iniOnOff section name ini = case lookupValue section name ini of
   Right "on" -> Just True
@@ -170,6 +174,9 @@ iniOnOff section name ini = case lookupValue section name ini of
   Right s -> error . T.unpack $ "invalid INI setting " <> name <> ": " <> s
   _ -> Nothing
 
+strDecodeIni :: StrEncoding a => Text -> Text -> Ini -> Maybe (Either String a)
+strDecodeIni section name ini = strDecode . encodeUtf8 <$> eitherToMaybe (lookupValue section name ini)
+
 withPrompt :: String -> IO a -> IO a
 withPrompt s a = putStr s >> hFlush stdout >> a
 

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

@@ -9,6 +9,7 @@ import Control.Concurrent (ThreadId)
 import Control.Monad.IO.Unlift
 import Crypto.Random
 import Data.ByteString.Char8 (ByteString)
+import Data.Int (Int64)
 import Data.List.NonEmpty (NonEmpty)
 import Data.Map.Strict (Map)
 import qualified Data.Map.Strict as M
@@ -54,10 +55,10 @@ data ServerConfig = ServerConfig
     -- and check interval, seconds
     inactiveClientExpiration :: Maybe ExpirationConfig,
     -- | log SMP server usage statistics, only aggregates are logged, seconds
-    logStatsInterval :: Maybe Int,
+    logStatsInterval :: Maybe Int64,
     -- | time of the day when the stats are logged first, to log at consistent times,
     -- irrespective of when the server is started (seconds from 00:00 UTC)
-    logStatsStartTime :: Int,
+    logStatsStartTime :: Int64,
     -- | file to log stats
     serverStatsLogFile :: FilePath,
     -- | file to save and restore stats
@@ -71,10 +72,13 @@ data ServerConfig = ServerConfig
     logTLSErrors :: Bool
   }
 
+defMsgExpirationDays :: Int64
+defMsgExpirationDays = 21
+
 defaultMessageExpiration :: ExpirationConfig
 defaultMessageExpiration =
   ExpirationConfig
-    { ttl = 30 * 86400, -- seconds, 30 days
+    { ttl = defMsgExpirationDays * 86400, -- seconds
       checkInterval = 43200 -- seconds, 12 hours
     }
 
@@ -164,8 +168,8 @@ newEnv config@ServerConfig {caCertificateFile, certificateFile, privateKeyFile,
       (qs, s') <- liftIO $ readWriteStoreLog s
       atomically $ do
         writeTVar queues =<< mapM newTVar qs
-        writeTVar senders $ M.foldr' addSender M.empty qs
-        writeTVar notifiers $ M.foldr' addNotifier M.empty qs
+        writeTVar senders $! M.foldr' addSender M.empty qs
+        writeTVar notifiers $! M.foldr' addNotifier M.empty qs
       pure s'
     addSender :: QueueRec -> Map SenderId RecipientId -> Map SenderId RecipientId
     addSender q = M.insert (senderId q) (recipientId q)

src/Simplex/Messaging/Server/Expiration.hs

@@ -10,8 +10,19 @@ data ExpirationConfig = ExpirationConfig
   { -- time after which the entity can be expired, seconds
     ttl :: Int64,
     -- interval to check expiration, seconds
-    checkInterval :: Int
+    checkInterval :: Int64
   }
 
 expireBeforeEpoch :: ExpirationConfig -> IO Int64
 expireBeforeEpoch ExpirationConfig {ttl} = subtract ttl . systemSeconds <$> liftIO getSystemTime
+
+showTTL :: Int64 -> String
+showTTL s
+  | s' /= 0 = show s <> " seconds"
+  | ms' /= 0 = show ms <> " minutes"
+  | hs' /= 0 = show hs <> " hours"
+  | otherwise = show ds <> " days"
+  where
+    (ms, s') = s `divMod` 60
+    (hs, ms') = ms `divMod` 60
+    (ds, hs') = hs `divMod` 24

src/Simplex/Messaging/Server/Main.hs

@@ -24,7 +24,7 @@ import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Protocol (BasicAuth (..), ProtoServerWithAuth (ProtoServerWithAuth), pattern SMPServer)
 import Simplex.Messaging.Server (runSMPServer)
 import Simplex.Messaging.Server.CLI
-import Simplex.Messaging.Server.Env.STM (ServerConfig (..), defaultInactiveClientExpiration, defaultMessageExpiration)
+import Simplex.Messaging.Server.Env.STM (ServerConfig (..), defaultInactiveClientExpiration, defaultMessageExpiration, defMsgExpirationDays)
 import Simplex.Messaging.Server.Expiration
 import Simplex.Messaging.Transport (simplexMQVersion, supportedSMPServerVRange)
 import Simplex.Messaging.Transport.Client (TransportHost (..))
@@ -106,7 +106,8 @@ smpServerCLI cfgPath logPath =
                 <> ("enable: " <> onOff enableStoreLog <> "\n\n")
                 <> "# Undelivered messages are optionally saved and restored when the server restarts,\n\
                    \# they are preserved in the .bak file until the next restart.\n"
-                <> ("restore_messages: " <> onOff enableStoreLog <> "\n\n")
+                <> ("restore_messages: " <> onOff enableStoreLog <> "\n")
+                <> ("expire_messages_days: " <> show defMsgExpirationDays <> "\n\n")
                 <> "# Log daily server statistics to CSV file\n"
                 <> ("log_stats: " <> onOff logStats <> "\n\n")
                 <> "[AUTH]\n\
@@ -140,10 +141,13 @@ smpServerCLI cfgPath logPath =
       fp <- checkSavedFingerprint cfgPath defaultX509Config
       let host = fromRight "<hostnames>" $ T.unpack <$> lookupValue "TRANSPORT" "host" ini
           port = T.unpack $ strictIni "TRANSPORT" "port" ini
-          cfg@ServerConfig {transports, storeLogFile, newQueueBasicAuth, inactiveClientExpiration} = serverConfig
+          cfg@ServerConfig {transports, storeLogFile, newQueueBasicAuth, messageExpiration, inactiveClientExpiration} = serverConfig
           srv = ProtoServerWithAuth (SMPServer [THDomainName host] (if port == "5223" then "" else port) (C.KeyHash fp)) newQueueBasicAuth
       printServiceInfo serverVersion srv
       printServerConfig transports storeLogFile
+      putStrLn $ case messageExpiration of
+        Just ExpirationConfig {ttl} -> "expiring messages after " <> showTTL ttl
+        _ -> "not expiring messages"
       putStrLn $ case inactiveClientExpiration of
         Just ExpirationConfig {ttl, checkInterval} -> "expiring clients inactive for " <> show ttl <> " seconds every " <> show checkInterval <> " seconds"
         _ -> "not expiring inactive clients"
@@ -160,8 +164,8 @@ smpServerCLI cfgPath logPath =
         serverConfig =
           ServerConfig
             { transports = iniTransports ini,
-              tbqSize = 32,
-              serverTbqSize = 128,
+              tbqSize = 64,
+              serverTbqSize = 1024,
               msgQueueQuota = 128,
               queueIdBytes = 24,
               msgIdBytes = 24, -- must be at least 24 bytes, it is used as 192-bit nonce for XSalsa20
@@ -178,10 +182,11 @@ smpServerCLI cfgPath logPath =
                       _ -> enableStoreLog $> messagesPath,
               -- allow creating new queues by default
               allowNewQueues = fromMaybe True $ iniOnOff "AUTH" "new_queues" ini,
-              newQueueBasicAuth = case lookupValue "AUTH" "create_password" ini of
-                Right auth -> either error Just . strDecode $ encodeUtf8 auth
-                _ -> Nothing,
-              messageExpiration = Just defaultMessageExpiration,
+              newQueueBasicAuth = either error id <$> strDecodeIni "AUTH" "create_password" ini,
+              messageExpiration =
+                Just defaultMessageExpiration
+                  { ttl = 86400 * readIniDefault defMsgExpirationDays "STORE_LOG" "expire_messages_days" ini
+                  },
               inactiveClientExpiration =
                 settingIsOn "INACTIVE_CLIENTS" "disconnect" ini
                   $> ExpirationConfig

src/Simplex/Messaging/Server/MsgStore.hs

@@ -1,13 +1,11 @@
-{-# LANGUAGE FunctionalDependencies #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE OverloadedStrings #-}
 
 module Simplex.Messaging.Server.MsgStore where
 
 import Control.Applicative ((<|>))
-import Data.Int (Int64)
 import Simplex.Messaging.Encoding.String
-import Simplex.Messaging.Protocol (Message (..), MsgId, RcvMessage (..), RecipientId)
+import Simplex.Messaging.Protocol (Message (..), RcvMessage (..), RecipientId)
 
 data MsgLogRecord = MLRv3 RecipientId Message | MLRv1 RecipientId RcvMessage
 
@@ -16,16 +14,3 @@ instance StrEncoding MsgLogRecord where
     MLRv3 rId msg -> strEncode (Str "v3", rId, msg)
     MLRv1 rId msg -> strEncode (rId, msg)
   strP = "v3 " *> (MLRv3 <$> strP_ <*> strP) <|> MLRv1 <$> strP_ <*> strP
-
-class MonadMsgStore s q m | s -> q where
-  getMsgQueue :: s -> RecipientId -> Int -> m q
-  delMsgQueue :: s -> RecipientId -> m ()
-  flushMsgQueue :: s -> RecipientId -> m [Message]
-
-class MonadMsgQueue q m where
-  writeMsg :: q -> Message -> m (Maybe Message) -- non blocking
-  tryPeekMsg :: q -> m (Maybe Message) -- non blocking
-  peekMsg :: q -> m Message -- blocking
-  tryDelMsg :: q -> MsgId -> m Bool -- non blocking
-  tryDelPeekMsg :: q -> MsgId -> m (Bool, Maybe Message) -- atomic delete (== read) last and peek next message, if available
-  deleteExpiredMsgs :: q -> Int64 -> m ()

src/Simplex/Messaging/Server/MsgStore/STM.hs

@@ -1,7 +1,6 @@
 {-# LANGUAGE ConstraintKinds #-}
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE FlexibleInstances #-}
-{-# LANGUAGE InstanceSigs #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE NamedFieldPuns #-}
@@ -9,8 +8,17 @@
 
 module Simplex.Messaging.Server.MsgStore.STM
   ( STMMsgStore,
-    MsgQueue,
+    MsgQueue (..),
     newMsgStore,
+    getMsgQueue,
+    delMsgQueue,
+    flushMsgQueue,
+    writeMsg,
+    tryPeekMsg,
+    peekMsg,
+    tryDelMsg,
+    tryDelPeekMsg,
+    deleteExpiredMsgs,
   )
 where
 
@@ -21,7 +29,6 @@ import Data.Functor (($>))
 import Data.Int (Int64)
 import Data.Time.Clock.System (SystemTime (systemSeconds))
 import Simplex.Messaging.Protocol (Message (..), MsgId, RecipientId)
-import Simplex.Messaging.Server.MsgStore
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
 import UnliftIO.STM
@@ -38,75 +45,73 @@ type STMMsgStore = TMap RecipientId MsgQueue
 newMsgStore :: STM STMMsgStore
 newMsgStore = TM.empty
 
-instance MonadMsgStore STMMsgStore MsgQueue STM where
-  getMsgQueue :: STMMsgStore -> RecipientId -> Int -> STM MsgQueue
-  getMsgQueue st rId quota = maybe newQ pure =<< TM.lookup rId st
-    where
-      newQ = do
-        msgQueue <- newTQueue
-        canWrite <- newTVar True
-        size <- newTVar 0
-        let q = MsgQueue {msgQueue, quota, canWrite, size}
-        TM.insert rId q st
-        pure q
+getMsgQueue :: STMMsgStore -> RecipientId -> Int -> STM MsgQueue
+getMsgQueue st rId quota = maybe newQ pure =<< TM.lookup rId st
+  where
+    newQ = do
+      msgQueue <- newTQueue
+      canWrite <- newTVar True
+      size <- newTVar 0
+      let q = MsgQueue {msgQueue, quota, canWrite, size}
+      TM.insert rId q st
+      pure q
 
-  delMsgQueue :: STMMsgStore -> RecipientId -> STM ()
-  delMsgQueue st rId = TM.delete rId st
+delMsgQueue :: STMMsgStore -> RecipientId -> STM ()
+delMsgQueue st rId = TM.delete rId st
 
-  flushMsgQueue :: STMMsgStore -> RecipientId -> STM [Message]
-  flushMsgQueue st rId = TM.lookupDelete rId st >>= maybe (pure []) (flushTQueue . msgQueue)
+flushMsgQueue :: STMMsgStore -> RecipientId -> STM [Message]
+flushMsgQueue st rId = TM.lookupDelete rId st >>= maybe (pure []) (flushTQueue . msgQueue)
 
-instance MonadMsgQueue MsgQueue STM where
-  writeMsg :: MsgQueue -> Message -> STM (Maybe Message)
-  writeMsg MsgQueue {msgQueue = q, quota, canWrite, size} msg = do
-    canWrt <- readTVar canWrite
-    empty <- isEmptyTQueue q
-    if canWrt || empty
-      then do
-        canWrt' <- (quota >) <$> readTVar size
-        writeTVar canWrite canWrt'
-        modifyTVar' size (+ 1)
-        if canWrt'
-          then writeTQueue q msg $> Just msg
-          else writeTQueue q msgQuota $> Nothing
-      else pure Nothing
-    where
-      msgQuota = MessageQuota {msgId = msgId msg, msgTs = msgTs msg}
+writeMsg :: MsgQueue -> Message -> STM (Maybe Message)
+writeMsg MsgQueue {msgQueue = q, quota, canWrite, size} msg = do
+  canWrt <- readTVar canWrite
+  empty <- isEmptyTQueue q
+  if canWrt || empty
+    then do
+      canWrt' <- (quota >) <$> readTVar size
+      writeTVar canWrite $! canWrt'
+      modifyTVar' size (+ 1)
+      if canWrt'
+        then writeTQueue q msg $> Just msg
+        else writeTQueue q msgQuota $> Nothing
+    else pure Nothing
+  where
+    msgQuota = MessageQuota {msgId = msgId msg, msgTs = msgTs msg}
 
-  tryPeekMsg :: MsgQueue -> STM (Maybe Message)
-  tryPeekMsg = tryPeekTQueue . msgQueue
-  {-# INLINE tryPeekMsg #-}
+tryPeekMsg :: MsgQueue -> STM (Maybe Message)
+tryPeekMsg = tryPeekTQueue . msgQueue
+{-# INLINE tryPeekMsg #-}
 
-  peekMsg :: MsgQueue -> STM Message
-  peekMsg = peekTQueue . msgQueue
-  {-# INLINE peekMsg #-}
+peekMsg :: MsgQueue -> STM Message
+peekMsg = peekTQueue . msgQueue
+{-# INLINE peekMsg #-}
 
-  tryDelMsg :: MsgQueue -> MsgId -> STM Bool
-  tryDelMsg mq msgId' =
-    tryPeekMsg mq >>= \case
-      Just msg
-        | msgId msg == msgId' || B.null msgId' -> tryDeleteMsg mq >> pure True
-        | otherwise -> pure False
-      _ -> pure False
+tryDelMsg :: MsgQueue -> MsgId -> STM (Maybe Message)
+tryDelMsg mq msgId' =
+  tryPeekMsg mq >>= \case
+    msg_@(Just msg)
+      | msgId msg == msgId' || B.null msgId' -> tryDeleteMsg mq >> pure msg_
+      | otherwise -> pure Nothing
+    _ -> pure Nothing
 
-  -- atomic delete (== read) last and peek next message if available
-  tryDelPeekMsg :: MsgQueue -> MsgId -> STM (Bool, Maybe Message)
-  tryDelPeekMsg mq msgId' =
-    tryPeekMsg mq >>= \case
-      msg_@(Just msg)
-        | msgId msg == msgId' || B.null msgId' -> (True,) <$> (tryDeleteMsg mq >> tryPeekMsg mq)
-        | otherwise -> pure (False, msg_)
-      _ -> pure (False, Nothing)
+-- atomic delete (== read) last and peek next message if available
+tryDelPeekMsg :: MsgQueue -> MsgId -> STM (Maybe Message, Maybe Message)
+tryDelPeekMsg mq msgId' =
+  tryPeekMsg mq >>= \case
+    msg_@(Just msg)
+      | msgId msg == msgId' || B.null msgId' -> (msg_,) <$> (tryDeleteMsg mq >> tryPeekMsg mq)
+      | otherwise -> pure (Nothing, msg_)
+    _ -> pure (Nothing, Nothing)
 
-  deleteExpiredMsgs :: MsgQueue -> Int64 -> STM ()
-  deleteExpiredMsgs mq old = loop
-    where
-      loop = tryPeekMsg mq >>= mapM_ delOldMsg
-      delOldMsg = \case
-        Message {msgTs} ->
-          when (systemSeconds msgTs < old) $
-            tryDeleteMsg mq >> loop
-        _ -> pure ()
+deleteExpiredMsgs :: MsgQueue -> Int64 -> STM ()
+deleteExpiredMsgs mq old = loop
+  where
+    loop = tryPeekMsg mq >>= mapM_ delOldMsg
+    delOldMsg = \case
+      Message {msgTs} ->
+        when (systemSeconds msgTs < old) $
+          tryDeleteMsg mq >> loop
+      _ -> pure ()
 
 tryDeleteMsg :: MsgQueue -> STM ()
 tryDeleteMsg MsgQueue {msgQueue = q, size} =

src/Simplex/Messaging/Server/QueueStore.hs

@@ -9,20 +9,20 @@ import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Protocol
 
 data QueueRec = QueueRec
-  { recipientId :: RecipientId,
-    recipientKey :: RcvPublicVerifyKey,
-    rcvDhSecret :: RcvDhSecret,
-    senderId :: SenderId,
-    senderKey :: Maybe SndPublicVerifyKey,
-    notifier :: Maybe NtfCreds,
-    status :: ServerQueueStatus
+  { recipientId :: !RecipientId,
+    recipientKey :: !RcvPublicVerifyKey,
+    rcvDhSecret :: !RcvDhSecret,
+    senderId :: !SenderId,
+    senderKey :: !(Maybe SndPublicVerifyKey),
+    notifier :: !(Maybe NtfCreds),
+    status :: !ServerQueueStatus
   }
   deriving (Eq, Show)
 
 data NtfCreds = NtfCreds
-  { notifierId :: NotifierId,
-    notifierKey :: NtfPublicVerifyKey,
-    rcvNtfDhSecret :: RcvNtfDhSecret
+  { notifierId :: !NotifierId,
+    notifierKey :: !NtfPublicVerifyKey,
+    rcvNtfDhSecret :: !RcvNtfDhSecret
   }
   deriving (Eq, Show)
 
@@ -33,12 +33,3 @@ instance StrEncoding NtfCreds where
     pure NtfCreds {notifierId, notifierKey, rcvNtfDhSecret}
 
 data ServerQueueStatus = QueueActive | QueueOff deriving (Eq, Show)
-
-class MonadQueueStore s m where
-  addQueue :: s -> QueueRec -> m (Either ErrorType ())
-  getQueue :: s -> SParty p -> QueueId -> m (Either ErrorType QueueRec)
-  secureQueue :: s -> RecipientId -> SndPublicVerifyKey -> m (Either ErrorType QueueRec)
-  addQueueNotifier :: s -> RecipientId -> NtfCreds -> m (Either ErrorType QueueRec)
-  deleteQueueNotifier :: s -> RecipientId -> m (Either ErrorType ())
-  suspendQueue :: s -> RecipientId -> m (Either ErrorType ())
-  deleteQueue :: s -> RecipientId -> m (Either ErrorType ())

src/Simplex/Messaging/Server/QueueStore/STM.hs

@@ -1,7 +1,6 @@
 {-# LANGUAGE DataKinds #-}
 {-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE GADTs #-}
-{-# LANGUAGE InstanceSigs #-}
 {-# LANGUAGE KindSignatures #-}
 {-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
@@ -10,7 +9,18 @@
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE UndecidableInstances #-}
 
-module Simplex.Messaging.Server.QueueStore.STM where
+module Simplex.Messaging.Server.QueueStore.STM
+  ( QueueStore (..),
+    newQueueStore,
+    addQueue,
+    getQueue,
+    secureQueue,
+    addQueueNotifier,
+    deleteQueueNotifier,
+    suspendQueue,
+    deleteQueue,
+  )
+where
 
 import Control.Monad
 import Data.Functor (($>))
@@ -34,66 +44,65 @@ newQueueStore = do
   notifiers <- TM.empty
   pure QueueStore {queues, senders, notifiers}
 
-instance MonadQueueStore QueueStore STM where
-  addQueue :: QueueStore -> QueueRec -> STM (Either ErrorType ())
-  addQueue QueueStore {queues, senders} q@QueueRec {recipientId = rId, senderId = sId} = do
-    ifM hasId (pure $ Left DUPLICATE_) $ do
-      qVar <- newTVar q
-      TM.insert rId qVar queues
-      TM.insert sId rId senders
-      pure $ Right ()
-    where
-      hasId = (||) <$> TM.member rId queues <*> TM.member sId senders
+addQueue :: QueueStore -> QueueRec -> STM (Either ErrorType ())
+addQueue QueueStore {queues, senders} q@QueueRec {recipientId = rId, senderId = sId} = do
+  ifM hasId (pure $ Left DUPLICATE_) $ do
+    qVar <- newTVar q
+    TM.insert rId qVar queues
+    TM.insert sId rId senders
+    pure $ Right ()
+  where
+    hasId = (||) <$> TM.member rId queues <*> TM.member sId senders
 
-  getQueue :: QueueStore -> SParty p -> QueueId -> STM (Either ErrorType QueueRec)
-  getQueue QueueStore {queues, senders, notifiers} party qId =
-    toResult <$> (mapM readTVar =<< getVar)
-    where
-      getVar = case party of
-        SRecipient -> TM.lookup qId queues
-        SSender -> TM.lookup qId senders $>>= (`TM.lookup` queues)
-        SNotifier -> TM.lookup qId notifiers $>>= (`TM.lookup` queues)
+getQueue :: QueueStore -> SParty p -> QueueId -> STM (Either ErrorType QueueRec)
+getQueue QueueStore {queues, senders, notifiers} party qId =
+  toResult <$> (mapM readTVar =<< getVar)
+  where
+    getVar = case party of
+      SRecipient -> TM.lookup qId queues
+      SSender -> TM.lookup qId senders $>>= (`TM.lookup` queues)
+      SNotifier -> TM.lookup qId notifiers $>>= (`TM.lookup` queues)
 
-  secureQueue :: QueueStore -> RecipientId -> SndPublicVerifyKey -> STM (Either ErrorType QueueRec)
-  secureQueue QueueStore {queues} rId sKey =
-    withQueue rId queues $ \qVar ->
-      readTVar qVar >>= \q -> case senderKey q of
-        Just k -> pure $ if sKey == k then Just q else Nothing
-        _ ->
-          let q' = q {senderKey = Just sKey}
-          in writeTVar qVar q' $> Just q'
+secureQueue :: QueueStore -> RecipientId -> SndPublicVerifyKey -> STM (Either ErrorType QueueRec)
+secureQueue QueueStore {queues} rId sKey =
+  withQueue rId queues $ \qVar ->
+    readTVar qVar >>= \q -> case senderKey q of
+      Just k -> pure $ if sKey == k then Just q else Nothing
+      _ ->
+        let q' = q {senderKey = Just sKey}
+         in writeTVar qVar q' $> Just q'
 
-  addQueueNotifier :: QueueStore -> RecipientId -> NtfCreds -> STM (Either ErrorType QueueRec)
-  addQueueNotifier QueueStore {queues, notifiers} rId ntfCreds@NtfCreds {notifierId = nId} = do
-    ifM (TM.member nId notifiers) (pure $ Left DUPLICATE_) $
-      withQueue rId queues $ \qVar -> do
-        q <- readTVar qVar
-        forM_ (notifier q) $ (`TM.delete` notifiers) . notifierId
-        writeTVar qVar q {notifier = Just ntfCreds}
-        TM.insert nId rId notifiers
-        pure $ Just q
-
-  deleteQueueNotifier :: QueueStore -> RecipientId -> STM (Either ErrorType ())
-  deleteQueueNotifier QueueStore {queues, notifiers} rId =
+addQueueNotifier :: QueueStore -> RecipientId -> NtfCreds -> STM (Either ErrorType QueueRec)
+addQueueNotifier QueueStore {queues, notifiers} rId ntfCreds@NtfCreds {notifierId = nId} = do
+  ifM (TM.member nId notifiers) (pure $ Left DUPLICATE_) $
     withQueue rId queues $ \qVar -> do
       q <- readTVar qVar
-      forM_ (notifier q) $ \NtfCreds {notifierId} -> TM.delete notifierId notifiers
-      writeTVar qVar q {notifier = Nothing}
-      pure $ Just ()
+      forM_ (notifier q) $ (`TM.delete` notifiers) . notifierId
+      writeTVar qVar $! q {notifier = Just ntfCreds}
+      TM.insert nId rId notifiers
+      pure $ Just q
 
-  suspendQueue :: QueueStore -> RecipientId -> STM (Either ErrorType ())
-  suspendQueue QueueStore {queues} rId =
-    withQueue rId queues $ \qVar -> modifyTVar' qVar (\q -> q {status = QueueOff}) $> Just ()
+deleteQueueNotifier :: QueueStore -> RecipientId -> STM (Either ErrorType ())
+deleteQueueNotifier QueueStore {queues, notifiers} rId =
+  withQueue rId queues $ \qVar -> do
+    q <- readTVar qVar
+    forM_ (notifier q) $ \NtfCreds {notifierId} -> TM.delete notifierId notifiers
+    writeTVar qVar $! q {notifier = Nothing}
+    pure $ Just ()
 
-  deleteQueue :: QueueStore -> RecipientId -> STM (Either ErrorType ())
-  deleteQueue QueueStore {queues, senders, notifiers} rId = do
-    TM.lookupDelete rId queues >>= \case
-      Just qVar ->
-        readTVar qVar >>= \q -> do
-          TM.delete (senderId q) senders
-          forM_ (notifier q) $ \NtfCreds {notifierId} -> TM.delete notifierId notifiers
-          pure $ Right ()
-      _ -> pure $ Left AUTH
+suspendQueue :: QueueStore -> RecipientId -> STM (Either ErrorType ())
+suspendQueue QueueStore {queues} rId =
+  withQueue rId queues $ \qVar -> modifyTVar' qVar (\q -> q {status = QueueOff}) $> Just ()
+
+deleteQueue :: QueueStore -> RecipientId -> STM (Either ErrorType ())
+deleteQueue QueueStore {queues, senders, notifiers} rId = do
+  TM.lookupDelete rId queues >>= \case
+    Just qVar ->
+      readTVar qVar >>= \q -> do
+        TM.delete (senderId q) senders
+        forM_ (notifier q) $ \NtfCreds {notifierId} -> TM.delete notifierId notifiers
+        pure $ Right ()
+    _ -> pure $ Left AUTH
 
 toResult :: Maybe a -> Either ErrorType a
 toResult = maybe (Left AUTH) Right

src/Simplex/Messaging/Server/Stats.hs

@@ -1,3 +1,4 @@
+{-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE PatternSynonyms #-}
@@ -5,7 +6,7 @@
 
 module Simplex.Messaging.Server.Stats where
 
-import Control.Applicative (optional)
+import Control.Applicative (optional, (<|>))
 import qualified Data.Attoparsec.ByteString.Char8 as A
 import qualified Data.ByteString.Char8 as B
 import Data.Set (Set)
@@ -24,7 +25,12 @@ data ServerStats = ServerStats
     qDeleted :: TVar Int,
     msgSent :: TVar Int,
     msgRecv :: TVar Int,
-    activeQueues :: PeriodStats RecipientId
+    activeQueues :: PeriodStats RecipientId,
+    msgSentNtf :: TVar Int,
+    msgRecvNtf :: TVar Int,
+    activeQueuesNtf :: PeriodStats RecipientId,
+    qCount :: TVar Int,
+    msgCount :: TVar Int
   }
 
 data ServerStatsData = ServerStatsData
@@ -34,8 +40,14 @@ data ServerStatsData = ServerStatsData
     _qDeleted :: Int,
     _msgSent :: Int,
     _msgRecv :: Int,
-    _activeQueues :: PeriodStatsData RecipientId
+    _activeQueues :: PeriodStatsData RecipientId,
+    _msgSentNtf :: Int,
+    _msgRecvNtf :: Int,
+    _activeQueuesNtf :: PeriodStatsData RecipientId,
+    _qCount :: Int,
+    _msgCount :: Int
   }
+  deriving (Show)
 
 newServerStats :: UTCTime -> STM ServerStats
 newServerStats ts = do
@@ -46,7 +58,12 @@ newServerStats ts = do
   msgSent <- newTVar 0
   msgRecv <- newTVar 0
   activeQueues <- newPeriodStats
-  pure ServerStats {fromTime, qCreated, qSecured, qDeleted, msgSent, msgRecv, activeQueues}
+  msgSentNtf <- newTVar 0
+  msgRecvNtf <- newTVar 0
+  activeQueuesNtf <- newPeriodStats
+  qCount <- newTVar 0
+  msgCount <- newTVar 0
+  pure ServerStats {fromTime, qCreated, qSecured, qDeleted, msgSent, msgRecv, activeQueues, msgSentNtf, msgRecvNtf, activeQueuesNtf, qCount, msgCount}
 
 getServerStatsData :: ServerStats -> STM ServerStatsData
 getServerStatsData s = do
@@ -57,20 +74,30 @@ getServerStatsData s = do
   _msgSent <- readTVar $ msgSent s
   _msgRecv <- readTVar $ msgRecv s
   _activeQueues <- getPeriodStatsData $ activeQueues s
-  pure ServerStatsData {_fromTime, _qCreated, _qSecured, _qDeleted, _msgSent, _msgRecv, _activeQueues}
+  _msgSentNtf <- readTVar $ msgSentNtf s
+  _msgRecvNtf <- readTVar $ msgRecvNtf s
+  _activeQueuesNtf <- getPeriodStatsData $ activeQueuesNtf s
+  _qCount <- readTVar $ qCount s
+  _msgCount <- readTVar $ msgCount s
+  pure ServerStatsData {_fromTime, _qCreated, _qSecured, _qDeleted, _msgSent, _msgRecv, _activeQueues, _msgSentNtf, _msgRecvNtf, _activeQueuesNtf, _qCount, _msgCount}
 
 setServerStats :: ServerStats -> ServerStatsData -> STM ()
 setServerStats s d = do
-  writeTVar (fromTime s) (_fromTime d)
-  writeTVar (qCreated s) (_qCreated d)
-  writeTVar (qSecured s) (_qSecured d)
-  writeTVar (qDeleted s) (_qDeleted d)
-  writeTVar (msgSent s) (_msgSent d)
-  writeTVar (msgRecv s) (_msgRecv d)
+  writeTVar (fromTime s) $! _fromTime d
+  writeTVar (qCreated s) $! _qCreated d
+  writeTVar (qSecured s) $! _qSecured d
+  writeTVar (qDeleted s) $! _qDeleted d
+  writeTVar (msgSent s) $! _msgSent d
+  writeTVar (msgRecv s) $! _msgRecv d
   setPeriodStats (activeQueues s) (_activeQueues d)
+  writeTVar (msgSentNtf s) $! _msgSentNtf d
+  writeTVar (msgRecvNtf s) $! _msgRecvNtf d
+  setPeriodStats (activeQueuesNtf s) (_activeQueuesNtf d)
+  writeTVar (qCount s) $! _qCount d
+  writeTVar (msgCount s) $! _qCount d
 
 instance StrEncoding ServerStatsData where
-  strEncode ServerStatsData {_fromTime, _qCreated, _qSecured, _qDeleted, _msgSent, _msgRecv, _activeQueues} =
+  strEncode ServerStatsData {_fromTime, _qCreated, _qSecured, _qDeleted, _msgSent, _msgRecv, _msgSentNtf, _msgRecvNtf, _activeQueues, _activeQueuesNtf} =
     B.unlines
       [ "fromTime=" <> strEncode _fromTime,
         "qCreated=" <> strEncode _qCreated,
@@ -78,8 +105,12 @@ instance StrEncoding ServerStatsData where
         "qDeleted=" <> strEncode _qDeleted,
         "msgSent=" <> strEncode _msgSent,
         "msgRecv=" <> strEncode _msgRecv,
+        "msgSentNtf=" <> strEncode _msgSentNtf,
+        "msgRecvNtf=" <> strEncode _msgRecvNtf,
         "activeQueues:",
-        strEncode _activeQueues
+        strEncode _activeQueues,
+        "activeQueuesNtf:",
+        strEncode _activeQueuesNtf
       ]
   strP = do
     _fromTime <- "fromTime=" *> strP <* A.endOfLine
@@ -88,15 +119,21 @@ instance StrEncoding ServerStatsData where
     _qDeleted <- "qDeleted=" *> strP <* A.endOfLine
     _msgSent <- "msgSent=" *> strP <* A.endOfLine
     _msgRecv <- "msgRecv=" *> strP <* A.endOfLine
-    r <- optional ("activeQueues:" <* A.endOfLine)
-    _activeQueues <- case r of
-      Just _ -> strP <* optional A.endOfLine
-      _ -> do
-        _day <- "dayMsgQueues=" *> strP <* A.endOfLine
-        _week <- "weekMsgQueues=" *> strP <* A.endOfLine
-        _month <- "monthMsgQueues=" *> strP <* optional A.endOfLine
-        pure PeriodStatsData {_day, _week, _month}
-    pure ServerStatsData {_fromTime, _qCreated, _qSecured, _qDeleted, _msgSent, _msgRecv, _activeQueues}
+    _msgSentNtf <- "msgSentNtf=" *> strP <* A.endOfLine <|> pure 0
+    _msgRecvNtf <- "msgRecvNtf=" *> strP <* A.endOfLine <|> pure 0
+    _activeQueues <-
+      optional ("activeQueues:" <* A.endOfLine) >>= \case
+        Just _ -> strP <* optional A.endOfLine
+        _ -> do
+          _day <- "dayMsgQueues=" *> strP <* A.endOfLine
+          _week <- "weekMsgQueues=" *> strP <* A.endOfLine
+          _month <- "monthMsgQueues=" *> strP <* optional A.endOfLine
+          pure PeriodStatsData {_day, _week, _month}
+    _activeQueuesNtf <-
+      optional ("activeQueuesNtf:" <* A.endOfLine) >>= \case
+        Just _ -> strP <* optional A.endOfLine
+        _ -> pure newPeriodStatsData
+    pure ServerStatsData {_fromTime, _qCreated, _qSecured, _qDeleted, _msgSent, _msgRecv, _msgSentNtf, _msgRecvNtf, _activeQueues, _activeQueuesNtf, _qCount = 0, _msgCount = 0}
 
 data PeriodStats a = PeriodStats
   { day :: TVar (Set a),
@@ -116,6 +153,10 @@ data PeriodStatsData a = PeriodStatsData
     _week :: Set a,
     _month :: Set a
   }
+  deriving (Show)
+
+newPeriodStatsData :: PeriodStatsData a
+newPeriodStatsData = PeriodStatsData {_day = S.empty, _week = S.empty, _month = S.empty}
 
 getPeriodStatsData :: PeriodStats a -> STM (PeriodStatsData a)
 getPeriodStatsData s = do
@@ -126,9 +167,9 @@ getPeriodStatsData s = do
 
 setPeriodStats :: PeriodStats a -> PeriodStatsData a -> STM ()
 setPeriodStats s d = do
-  writeTVar (day s) (_day d)
-  writeTVar (week s) (_week d)
-  writeTVar (month s) (_month d)
+  writeTVar (day s) $! _day d
+  writeTVar (week s) $! _week d
+  writeTVar (month s) $! _month d
 
 instance (Ord a, StrEncoding a) => StrEncoding (PeriodStatsData a) where
   strEncode PeriodStatsData {_day, _week, _month} =
@@ -165,4 +206,4 @@ updatePeriodStats stats pId = do
   updatePeriod week
   updatePeriod month
   where
-    updatePeriod pSel = modifyTVar (pSel stats) (S.insert pId)
+    updatePeriod pSel = modifyTVar' (pSel stats) (S.insert pId)

src/Simplex/Messaging/Server/StoreLog.hs

@@ -38,7 +38,7 @@ import qualified Data.Map.Strict as M
 import Simplex.Messaging.Encoding.String
 import Simplex.Messaging.Protocol
 import Simplex.Messaging.Server.QueueStore (NtfCreds (..), QueueRec (..), ServerQueueStatus (..))
-import Simplex.Messaging.Transport (trimCR)
+import Simplex.Messaging.Transport.Buffer (trimCR)
 import System.Directory (doesFileExist)
 import System.IO
 

src/Simplex/Messaging/Transport.hs

@@ -56,9 +56,6 @@ module Simplex.Messaging.Transport
     transportErrorP,
     sendHandshake,
     getHandshake,
-
-    -- * Trim trailing CR
-    trimCR,
   )
 where
 
@@ -75,15 +72,18 @@ import qualified Data.ByteString.Char8 as B
 import qualified Data.ByteString.Lazy as BL
 import Data.Default (def)
 import Data.Functor (($>))
+import Data.Version (showVersion)
 import GHC.Generics (Generic)
 import GHC.IO.Handle.Internals (ioe_EOF)
 import Generic.Random (genericArbitraryU)
 import Network.Socket
 import qualified Network.TLS as T
 import qualified Network.TLS.Extra as TE
+import qualified Paths_simplexmq as SMQ
 import qualified Simplex.Messaging.Crypto as C
 import Simplex.Messaging.Encoding
 import Simplex.Messaging.Parsers (dropPrefix, parse, parseRead1, sumTypeJSON)
+import Simplex.Messaging.Transport.Buffer
 import Simplex.Messaging.Util (bshow, catchAll, catchAll_)
 import Simplex.Messaging.Version
 import Test.QuickCheck (Arbitrary (..))
@@ -100,7 +100,7 @@ supportedSMPServerVRange :: VersionRange
 supportedSMPServerVRange = mkVersionRange 1 5
 
 simplexMQVersion :: String
-simplexMQVersion = "4.2.1"
+simplexMQVersion = showVersion SMQ.version
 
 -- * Transport connection class
 
@@ -150,8 +150,7 @@ data TLS = TLS
   { tlsContext :: T.Context,
     tlsPeer :: TransportPeer,
     tlsUniq :: ByteString,
-    buffer :: TVar ByteString,
-    getLock :: TMVar ()
+    tlsBuffer :: TBuffer
   }
 
 connectTLS :: T.TLSParams p => Maybe HostName -> Bool -> p -> Socket -> IO T.Context
@@ -167,9 +166,8 @@ getTLS :: TransportPeer -> T.Context -> IO TLS
 getTLS tlsPeer cxt = withTlsUnique tlsPeer cxt newTLS
   where
     newTLS tlsUniq = do
-      buffer <- newTVarIO ""
-      getLock <- newTMVarIO ()
-      pure TLS {tlsContext = cxt, tlsPeer, tlsUniq, buffer, getLock}
+      tlsBuffer <- atomically newTBuffer
+      pure TLS {tlsContext = cxt, tlsPeer, tlsUniq, tlsBuffer}
 
 withTlsUnique :: TransportPeer -> T.Context -> (ByteString -> IO c) -> IO c
 withTlsUnique peer cxt f =
@@ -206,53 +204,22 @@ instance Transport TLS where
   tlsUnique = tlsUniq
   closeConnection tls = closeTLS $ tlsContext tls
 
+  -- https://hackage.haskell.org/package/tls-1.6.0/docs/Network-TLS.html#v:recvData
+  -- this function may return less than requested number of bytes
   cGet :: TLS -> Int -> IO ByteString
-  cGet TLS {tlsContext, buffer, getLock} n =
-    E.bracket_
-      (atomically $ takeTMVar getLock)
-      (atomically $ putTMVar getLock ())
-      $ do
-        b <- readChunks =<< readTVarIO buffer
-        let (s, b') = B.splitAt n b
-        atomically $ writeTVar buffer b'
-        pure s
-    where
-      readChunks :: ByteString -> IO ByteString
-      readChunks b
-        | B.length b >= n = pure b
-        | otherwise =
-          T.recvData tlsContext >>= \case
-            -- https://hackage.haskell.org/package/tls-1.6.0/docs/Network-TLS.html#v:recvData
-            "" -> ioe_EOF
-            s -> readChunks $ b <> s
+  cGet TLS {tlsContext, tlsBuffer} n = getBuffered tlsBuffer n (T.recvData tlsContext)
 
   cPut :: TLS -> ByteString -> IO ()
   cPut tls = T.sendData (tlsContext tls) . BL.fromStrict
 
   getLn :: TLS -> IO ByteString
-  getLn TLS {tlsContext, buffer, getLock} = do
-    E.bracket_
-      (atomically $ takeTMVar getLock)
-      (atomically $ putTMVar getLock ())
-      $ do
-        b <- readChunks =<< readTVarIO buffer
-        let (s, b') = B.break (== '\n') b
-        atomically $ writeTVar buffer (B.drop 1 b') -- drop '\n' we made a break at
-        pure $ trimCR s
+  getLn TLS {tlsContext, tlsBuffer} = do
+    getLnBuffered tlsBuffer (T.recvData tlsContext) `E.catch` handleEOF
     where
-      readChunks :: ByteString -> IO ByteString
-      readChunks b
-        | B.elem '\n' b = pure b
-        | otherwise = readChunks . (b <>) =<< T.recvData tlsContext `E.catch` handleEOF
       handleEOF = \case
         T.Error_EOF -> E.throwIO TEBadBlock
         e -> E.throwIO e
 
--- | Trim trailing CR from ByteString.
-trimCR :: ByteString -> ByteString
-trimCR "" = ""
-trimCR s = if B.last s == '\r' then B.init s else s
-
 -- * SMP transport
 
 -- | The handle for SMP encrypted transport connection over Transport .
@@ -335,7 +302,7 @@ transportErrorP =
   "BLOCK" $> TEBadBlock
     <|> "LARGE_MSG" $> TELargeMsg
     <|> "SESSION" $> TEBadSession
-    <|> TEHandshake <$> parseRead1
+    <|> "HANDSHAKE " *> (TEHandshake <$> parseRead1)
 
 -- | Serialize SMP encrypted transport error.
 serializeTransportError :: TransportError -> ByteString
@@ -343,7 +310,7 @@ serializeTransportError = \case
   TEBadBlock -> "BLOCK"
   TELargeMsg -> "LARGE_MSG"
   TEBadSession -> "SESSION"
-  TEHandshake e -> bshow e
+  TEHandshake e -> "HANDSHAKE " <> bshow e
 
 -- | Pad and send block to SMP transport.
 tPutBlock :: Transport c => THandle c -> ByteString -> IO (Either TransportError ())
@@ -353,10 +320,11 @@ tPutBlock THandle {connection = c, blockSize} block =
 
 -- | Receive block from SMP transport.
 tGetBlock :: Transport c => THandle c -> IO (Either TransportError ByteString)
-tGetBlock THandle {connection = c, blockSize} =
-  cGet c blockSize >>= \case
-    "" -> ioe_EOF
-    msg -> pure . first (const TELargeMsg) $ C.unPad msg
+tGetBlock THandle {connection = c, blockSize} = do
+  msg <- cGet c blockSize
+  if B.length msg == blockSize
+    then pure . first (const TELargeMsg) $ C.unPad msg
+    else ioe_EOF
 
 -- | Server SMP transport handshake.
 --

src/Simplex/Messaging/Transport/Buffer.hs

@@ -0,0 +1,63 @@
+{-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+module Simplex.Messaging.Transport.Buffer where
+
+import Control.Concurrent.STM
+import qualified Control.Exception as E
+import Data.ByteString.Char8 (ByteString)
+import qualified Data.ByteString.Char8 as B
+
+data TBuffer = TBuffer
+  { buffer :: TVar ByteString,
+    getLock :: TMVar ()
+  }
+
+newTBuffer :: STM TBuffer
+newTBuffer = do
+  buffer <- newTVar ""
+  getLock <- newTMVar ()
+  pure TBuffer {buffer, getLock}
+
+withBufferLock :: TBuffer -> IO a -> IO a
+withBufferLock TBuffer {getLock} =
+  E.bracket_
+    (atomically $ takeTMVar getLock)
+    (atomically $ putTMVar getLock ())
+
+getBuffered :: TBuffer -> Int -> IO ByteString -> IO ByteString
+getBuffered tb@TBuffer {buffer} n getChunk = withBufferLock tb $ do
+  b <- readChunks =<< readTVarIO buffer
+  let (s, b') = B.splitAt n b
+  atomically $ writeTVar buffer $! b'
+  -- This would prevent the need to pad auth tag in HTTP2
+  -- threadDelay 150
+  pure s
+  where
+    readChunks :: ByteString -> IO ByteString
+    readChunks b
+      | B.length b >= n = pure b
+      | otherwise =
+        getChunk >>= \case
+          "" -> pure b
+          s -> readChunks $ b <> s
+
+-- This function is only used in test and needs to be improved before it can be used in production,
+-- it will never complete if TLS connection is closed before there is newline.
+getLnBuffered :: TBuffer -> IO ByteString -> IO ByteString
+getLnBuffered tb@TBuffer {buffer} getChunk = withBufferLock tb $ do
+  b <- readChunks =<< readTVarIO buffer
+  let (s, b') = B.break (== '\n') b
+  atomically $ writeTVar buffer $! B.drop 1 b' -- drop '\n' we made a break at
+  pure $ trimCR s
+  where
+    readChunks :: ByteString -> IO ByteString
+    readChunks b
+      | B.elem '\n' b = pure b
+      | otherwise = readChunks . (b <>) =<< getChunk
+
+-- | Trim trailing CR from ByteString.
+trimCR :: ByteString -> ByteString
+trimCR "" = ""
+trimCR s = if B.last s == '\r' then B.init s else s

src/Simplex/Messaging/Transport/Client.hs

@@ -26,12 +26,14 @@ import Data.Aeson (FromJSON (..), ToJSON (..))
 import qualified Data.Attoparsec.ByteString.Char8 as A
 import Data.ByteString.Char8 (ByteString)
 import qualified Data.ByteString.Char8 as B
+import Data.Char (isAsciiLower, isDigit, isHexDigit)
 import Data.Default (def)
+import Data.IP
 import Data.List.NonEmpty (NonEmpty (..))
 import qualified Data.List.NonEmpty as L
 import Data.Maybe (fromMaybe)
 import Data.String
-import Data.Word (Word8)
+import Data.Word (Word32, Word8)
 import qualified Data.X509 as X
 import qualified Data.X509.CertificateStore as XS
 import Data.X509.Validation (Fingerprint (..))
@@ -54,6 +56,7 @@ import qualified UnliftIO.Exception as E
 
 data TransportHost
   = THIPv4 (Word8, Word8, Word8, Word8)
+  | THIPv6 (Word32, Word32, Word32, Word32)
   | THOnionHost ByteString
   | THDomainName HostName
   deriving (Eq, Ord, Show)
@@ -65,16 +68,21 @@ instance Encoding TransportHost where
 instance StrEncoding TransportHost where
   strEncode = \case
     THIPv4 (a1, a2, a3, a4) -> B.intercalate "." $ map bshow [a1, a2, a3, a4]
+    THIPv6 addr -> bshow $ toIPv6w addr
     THOnionHost host -> host
     THDomainName host -> B.pack host
   strP =
     A.choice
       [ THIPv4 <$> ((,,,) <$> ipNum <*> ipNum <*> ipNum <*> A.decimal),
-        THOnionHost <$> ((<>) <$> A.takeTill (== '.') <*> A.string ".onion"),
-        THDomainName . B.unpack <$> A.takeWhile1 (A.notInClass ":#,;/ ")
+        maybe (Left "bad IPv6") (Right . THIPv6 . fromIPv6w) . readMaybe . B.unpack <$?> A.takeWhile1 (\c -> isHexDigit c || c == ':'),
+        THOnionHost <$> ((<>) <$> A.takeWhile (\c -> isAsciiLower c || isDigit c) <*> A.string ".onion"),
+        THDomainName . B.unpack <$> (notOnion <$?> A.takeWhile1 (A.notInClass ":#,;/ \n\r\t"))
       ]
     where
-      ipNum = A.decimal <* A.char '.'
+      ipNum = validIP <$?> (A.decimal <* A.char '.')
+      validIP :: Int -> Either String Word8
+      validIP n = if 0 <= n && n <= 255 then Right $ fromIntegral n else Left "invalid IP address"
+      notOnion s = if ".onion" `B.isSuffixOf` s then Left "invalid onion host" else Right s
 
 instance ToJSON TransportHost where
   toEncoding = strToJEncoding
@@ -107,15 +115,15 @@ defaultTransportClientConfig :: TransportClientConfig
 defaultTransportClientConfig = TransportClientConfig Nothing (Just defaultKeepAliveOpts) True
 
 -- | Connect to passed TCP host:port and pass handle to the client.
-runTransportClient :: (Transport c, MonadUnliftIO m) => TransportClientConfig -> TransportHost -> ServiceName -> Maybe C.KeyHash -> (c -> m a) -> m a
+runTransportClient :: (Transport c, MonadUnliftIO m) => TransportClientConfig -> Maybe ByteString -> TransportHost -> ServiceName -> Maybe C.KeyHash -> (c -> m a) -> m a
 runTransportClient = runTLSTransportClient supportedParameters Nothing
 
-runTLSTransportClient :: (Transport c, MonadUnliftIO m) => T.Supported -> Maybe XS.CertificateStore -> TransportClientConfig -> TransportHost -> ServiceName -> Maybe C.KeyHash -> (c -> m a) -> m a
-runTLSTransportClient tlsParams caStore_ TransportClientConfig {socksProxy, tcpKeepAlive, logTLSErrors} host port keyHash client = do
+runTLSTransportClient :: (Transport c, MonadUnliftIO m) => T.Supported -> Maybe XS.CertificateStore -> TransportClientConfig -> Maybe ByteString -> TransportHost -> ServiceName -> Maybe C.KeyHash -> (c -> m a) -> m a
+runTLSTransportClient tlsParams caStore_ TransportClientConfig {socksProxy, tcpKeepAlive, logTLSErrors} proxyUsername host port keyHash client = do
   let hostName = B.unpack $ strEncode host
       clientParams = mkTLSClientParams tlsParams caStore_ hostName port keyHash
       connectTCP = case socksProxy of
-        Just proxy -> connectSocksClient proxy $ hostAddr host
+        Just proxy -> connectSocksClient proxy proxyUsername $ hostAddr host
         _ -> connectTCPClient hostName
   c <- liftIO $ do
     sock <- connectTCP port
@@ -125,6 +133,7 @@ runTLSTransportClient tlsParams caStore_ TransportClientConfig {socksProxy, tcpK
   where
     hostAddr = \case
       THIPv4 addr -> SocksAddrIPV4 $ tupleToHostAddress addr
+      THIPv6 addr -> SocksAddrIPV6 addr
       THOnionHost h -> SocksAddrDomainName h
       THDomainName h -> SocksAddrDomainName $ B.pack h
 
@@ -153,10 +162,12 @@ connectTCPClient host port = withSocketsDo $ resolve >>= tryOpen err
 defaultSMPPort :: PortNumber
 defaultSMPPort = 5223
 
-connectSocksClient :: SocksProxy -> SocksHostAddress -> ServiceName -> IO Socket
-connectSocksClient (SocksProxy addr) hostAddr _port = do
+connectSocksClient :: SocksProxy -> Maybe ByteString -> SocksHostAddress -> ServiceName -> IO Socket
+connectSocksClient (SocksProxy addr) proxyUsername hostAddr _port = do
   let port = if null _port then defaultSMPPort else fromMaybe defaultSMPPort $ readMaybe _port
-  fst <$> socksConnect (defaultSocksConf addr) (SocksAddress hostAddr port)
+  fst <$> case proxyUsername of
+    Just username -> socksConnectAuth (defaultSocksConf addr) (SocksAddress hostAddr port) (SocksCredentials username "")
+    _ -> socksConnect (defaultSocksConf addr) (SocksAddress hostAddr port)
 
 defaultSocksHost :: HostAddress
 defaultSocksHost = tupleToHostAddress (127, 0, 0, 1)

src/Simplex/Messaging/Transport/HTTP2.hs

@@ -1,20 +1,32 @@
+{-# LANGUAGE NamedFieldPuns #-}
+
 module Simplex.Messaging.Transport.HTTP2 where
 
+import Control.Concurrent.STM
 import qualified Control.Exception as E
+import Data.ByteString.Char8 (ByteString)
+import qualified Data.ByteString.Char8 as B
 import Data.Default (def)
+import Data.Maybe (fromMaybe)
 import Foreign (mallocBytes)
 import Network.HPACK (BufferSize)
 import Network.HTTP2.Client (Config (..), defaultPositionReadMaker, freeSimpleConfig)
+import qualified Network.HTTP2.Client as HC
+import qualified Network.HTTP2.Server as HS
 import qualified Network.TLS as T
 import qualified Network.TLS.Extra as TE
-import Simplex.Messaging.Transport (TLS, Transport (cGet, cPut))
+import Simplex.Messaging.Transport (SessionId, TLS (tlsUniq), Transport (cGet, cPut))
+import Simplex.Messaging.Transport.Buffer
 import qualified System.TimeManager as TI
 
-withTlsConfig :: TLS -> BufferSize -> (Config -> IO ()) -> IO ()
-withTlsConfig c sz = E.bracket (allocTlsConfig c sz) freeSimpleConfig
+defaultHTTP2BufferSize :: BufferSize
+defaultHTTP2BufferSize = 32768
 
-allocTlsConfig :: TLS -> BufferSize -> IO Config
-allocTlsConfig c sz = do
+withHTTP2 :: BufferSize -> (Config -> SessionId -> IO a) -> TLS -> IO a
+withHTTP2 sz run c = E.bracket (allocHTTP2Config c sz) freeSimpleConfig (`run` tlsUniq c)
+
+allocHTTP2Config :: TLS -> BufferSize -> IO Config
+allocHTTP2Config c sz = do
   buf <- mallocBytes sz
   tm <- TI.initialize $ 30 * 1000000
   pure
@@ -34,3 +46,36 @@ http2TLSParams =
       T.supportedCiphers = TE.ciphersuite_strong_det,
       T.supportedSecureRenegotiation = False
     }
+
+data HTTP2Body = HTTP2Body
+  { bodyHead :: ByteString,
+    bodySize :: Int,
+    bodyPart :: Maybe (Int -> IO ByteString),
+    bodyBuffer :: TBuffer
+  }
+
+class HTTP2BodyChunk a where
+  getBodyChunk :: a -> IO ByteString
+  getBodySize :: a -> Maybe Int
+
+instance HTTP2BodyChunk HC.Response where
+  getBodyChunk = HC.getResponseBodyChunk
+  {-# INLINE getBodyChunk #-}
+  getBodySize = HC.responseBodySize
+  {-# INLINE getBodySize #-}
+
+instance HTTP2BodyChunk HS.Request where
+  getBodyChunk = HS.getRequestBodyChunk
+  {-# INLINE getBodyChunk #-}
+  getBodySize = HS.requestBodySize
+  {-# INLINE getBodySize #-}
+
+getHTTP2Body :: HTTP2BodyChunk a => a -> Int -> IO HTTP2Body
+getHTTP2Body r n = do
+  bodyBuffer <- atomically newTBuffer
+  let getPart n' = getBuffered bodyBuffer n' $ getBodyChunk r
+  bodyHead <- getPart n
+  let bodySize = fromMaybe 0 $ getBodySize r
+      -- TODO check bodySize once it is set
+      bodyPart = if B.length bodyHead == n then Just getPart else Nothing
+  pure HTTP2Body {bodyHead, bodySize, bodyPart, bodyBuffer}

src/Simplex/Messaging/Transport/HTTP2/Client.hs

@@ -1,4 +1,5 @@
 {-# LANGUAGE DuplicateRecordFields #-}
+{-# LANGUAGE LambdaCase #-}
 {-# LANGUAGE NamedFieldPuns #-}
 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE ScopedTypeVariables #-}
@@ -6,28 +7,39 @@
 module Simplex.Messaging.Transport.HTTP2.Client where
 
 import Control.Concurrent.Async
-import Control.Exception (IOException)
+import Control.Exception (IOException, try)
 import qualified Control.Exception as E
 import Control.Monad.Except
 import Data.ByteString.Char8 (ByteString)
-import qualified Data.ByteString.Char8 as B
-import Data.Maybe (isNothing)
+import Data.Functor (($>))
+import Data.Time (UTCTime, getCurrentTime)
 import qualified Data.X509.CertificateStore as XS
-import Network.HPACK (HeaderTable)
+import Network.HPACK (BufferSize)
 import Network.HTTP2.Client (ClientConfig (..), Request, Response)
 import qualified Network.HTTP2.Client as H
 import Network.Socket (HostName, ServiceName)
 import qualified Network.TLS as T
 import Numeric.Natural (Natural)
+import qualified Simplex.Messaging.Crypto as C
+import Simplex.Messaging.Encoding.String
+import Simplex.Messaging.Transport (SessionId)
 import Simplex.Messaging.Transport.Client (TransportClientConfig (..), TransportHost (..), runTLSTransportClient)
-import Simplex.Messaging.Transport.HTTP2 (http2TLSParams, withTlsConfig)
+import Simplex.Messaging.Transport.HTTP2
 import UnliftIO.STM
 import UnliftIO.Timeout
 
 data HTTP2Client = HTTP2Client
-  { action :: Maybe (Async ()),
-    connected :: TVar Bool,
-    host :: HostName,
+  { action :: Maybe (Async HTTP2Response),
+    sessionId :: SessionId,
+    sessionTs :: UTCTime,
+    sendReq :: Request -> (Response -> IO HTTP2Response) -> IO HTTP2Response,
+    client_ :: HClient
+  }
+
+data HClient = HClient
+  { connected :: TVar Bool,
+    disconnected :: IO (),
+    host :: TransportHost,
     port :: ServiceName,
     config :: HTTP2ClientConfig,
     reqQ :: TBQueue (Request, TMVar HTTP2Response)
@@ -35,15 +47,15 @@ data HTTP2Client = HTTP2Client
 
 data HTTP2Response = HTTP2Response
   { response :: Response,
-    respBody :: ByteString,
-    respTrailers :: Maybe HeaderTable
+    respBody :: HTTP2Body
   }
 
 data HTTP2ClientConfig = HTTP2ClientConfig
   { qSize :: Natural,
     connTimeout :: Int,
     transportConfig :: TransportClientConfig,
-    caStoreFile :: FilePath,
+    bufferSize :: BufferSize,
+    bodyHeadSize :: Int,
     suportedTLSParams :: T.Supported
   }
   deriving (Show)
@@ -54,73 +66,89 @@ defaultHTTP2ClientConfig =
     { qSize = 64,
       connTimeout = 10000000,
       transportConfig = TransportClientConfig Nothing Nothing True,
-      caStoreFile = "/etc/ssl/cert.pem",
+      bufferSize = defaultHTTP2BufferSize,
+      bodyHeadSize = 16384,
       suportedTLSParams = http2TLSParams
     }
 
-data HTTP2ClientError = HCResponseTimeout | HCNetworkError | HCNetworkError1 | HCIOError IOException
+data HTTP2ClientError = HCResponseTimeout | HCNetworkError | HCIOError IOException
   deriving (Show)
 
-getHTTP2Client :: HostName -> ServiceName -> HTTP2ClientConfig -> IO () -> IO (Either HTTP2ClientError HTTP2Client)
-getHTTP2Client host port config@HTTP2ClientConfig {transportConfig, connTimeout, caStoreFile, suportedTLSParams} disconnected =
+getHTTP2Client :: HostName -> ServiceName -> Maybe XS.CertificateStore -> HTTP2ClientConfig -> IO () -> IO (Either HTTP2ClientError HTTP2Client)
+getHTTP2Client host port = getVerifiedHTTP2Client Nothing (THDomainName host) port Nothing
+
+getVerifiedHTTP2Client :: Maybe ByteString -> TransportHost -> ServiceName -> Maybe C.KeyHash -> Maybe XS.CertificateStore -> HTTP2ClientConfig -> IO () -> IO (Either HTTP2ClientError HTTP2Client)
+getVerifiedHTTP2Client proxyUsername host port keyHash caStore config@HTTP2ClientConfig {transportConfig, bufferSize, bodyHeadSize, connTimeout, suportedTLSParams} disconnected =
   (atomically mkHTTPS2Client >>= runClient)
     `E.catch` \(e :: IOException) -> pure . Left $ HCIOError e
   where
-    mkHTTPS2Client :: STM HTTP2Client
+    mkHTTPS2Client :: STM HClient
     mkHTTPS2Client = do
       connected <- newTVar False
       reqQ <- newTBQueue $ qSize config
-      pure HTTP2Client {action = Nothing, connected, host, port, config, reqQ}
+      pure HClient {connected, disconnected, host, port, config, reqQ}
 
-    runClient :: HTTP2Client -> IO (Either HTTP2ClientError HTTP2Client)
+    runClient :: HClient -> IO (Either HTTP2ClientError HTTP2Client)
     runClient c = do
       cVar <- newEmptyTMVarIO
-      caStore <- XS.readCertificateStore caStoreFile
-      when (isNothing caStore) . putStrLn $ "Error loading CertificateStore from " <> caStoreFile
       action <-
         async $
-          runHTTP2Client suportedTLSParams caStore transportConfig host port (client c cVar)
+          runHTTP2Client suportedTLSParams caStore transportConfig bufferSize proxyUsername host port keyHash (client c cVar)
             `E.finally` atomically (putTMVar cVar $ Left HCNetworkError)
-      conn_ <- connTimeout `timeout` atomically (takeTMVar cVar)
-      pure $ case conn_ of
-        Just (Right ()) -> Right c {action = Just action}
+      c_ <- connTimeout `timeout` atomically (takeTMVar cVar)
+      pure $ case c_ of
+        Just (Right c') -> Right c' {action = Just action}
         Just (Left e) -> Left e
-        Nothing -> Left HCNetworkError1
+        Nothing -> Left HCNetworkError
 
-    client :: HTTP2Client -> TMVar (Either HTTP2ClientError ()) -> (Request -> (Response -> IO ()) -> IO ()) -> IO ()
-    client c cVar sendReq = do
+    client :: HClient -> TMVar (Either HTTP2ClientError HTTP2Client) -> SessionId -> H.Client HTTP2Response
+    client c cVar sessionId sendReq = do
+      sessionTs <- getCurrentTime
+      let c' = HTTP2Client {action = Nothing, client_ = c, sendReq, sessionId, sessionTs}
       atomically $ do
         writeTVar (connected c) True
-        putTMVar cVar $ Right ()
-      process c sendReq `E.finally` disconnected
+        putTMVar cVar (Right c')
+      process c' sendReq `E.finally` disconnected
 
-    process :: HTTP2Client -> (Request -> (Response -> IO ()) -> IO ()) -> IO ()
-    process HTTP2Client {reqQ} sendReq = forever $ do
+    process :: HTTP2Client -> H.Client HTTP2Response
+    process HTTP2Client {client_ = HClient {reqQ}} sendReq = forever $ do
       (req, respVar) <- atomically $ readTBQueue reqQ
       sendReq req $ \r -> do
-        let writeResp respBody respTrailers = atomically $ putTMVar respVar HTTP2Response {response = r, respBody, respTrailers}
-        respBody <- getResponseBody r ""
-        respTrailers <- H.getResponseTrailers r
-        writeResp respBody respTrailers
-
-    getResponseBody :: Response -> ByteString -> IO ByteString
-    getResponseBody r s =
-      H.getResponseBodyChunk r >>= \chunk ->
-        if B.null chunk then pure s else getResponseBody r $ s <> chunk
+        respBody <- getHTTP2Body r bodyHeadSize
+        let resp = HTTP2Response {response = r, respBody}
+        atomically $ putTMVar respVar resp
+        pure resp
 
 -- | Disconnects client from the server and terminates client threads.
 closeHTTP2Client :: HTTP2Client -> IO ()
 closeHTTP2Client = mapM_ uninterruptibleCancel . action
 
-sendRequest :: HTTP2Client -> Request -> IO (Either HTTP2ClientError HTTP2Response)
-sendRequest HTTP2Client {reqQ, config} req = do
+sendRequest :: HTTP2Client -> Request -> Maybe Int -> IO (Either HTTP2ClientError HTTP2Response)
+sendRequest HTTP2Client {client_ = HClient {config, reqQ}} req reqTimeout_ = do
   resp <- newEmptyTMVarIO
   atomically $ writeTBQueue reqQ (req, resp)
-  maybe (Left HCResponseTimeout) Right <$> (connTimeout config `timeout` atomically (takeTMVar resp))
+  let reqTimeout = http2RequestTimeout config reqTimeout_
+  maybe (Left HCResponseTimeout) Right <$> (reqTimeout `timeout` atomically (takeTMVar resp))
 
-runHTTP2Client :: T.Supported -> Maybe XS.CertificateStore -> TransportClientConfig -> HostName -> ServiceName -> ((Request -> (Response -> IO ()) -> IO ()) -> IO ()) -> IO ()
-runHTTP2Client tlsParams caStore tcConfig host port client =
-  runTLSTransportClient tlsParams caStore tcConfig (THDomainName host) port Nothing $ \c ->
-    withTlsConfig c 16384 (`run` client)
+-- | this function should not be used until HTTP2 is thread safe, use sendRequest
+sendRequestDirect :: HTTP2Client -> Request -> Maybe Int -> IO (Either HTTP2ClientError HTTP2Response)
+sendRequestDirect HTTP2Client {client_ = HClient {config, disconnected}, sendReq} req reqTimeout_ = do
+  let reqTimeout = http2RequestTimeout config reqTimeout_
+  reqTimeout `timeout` try (sendReq req process) >>= \case
+    Just (Right r) -> pure $ Right r
+    Just (Left e) -> disconnected $> Left (HCIOError e)
+    Nothing -> pure $ Left HCNetworkError
   where
-    run = H.run $ ClientConfig "https" (B.pack host) 20
+    process r = do
+      respBody <- getHTTP2Body r $ bodyHeadSize config
+      pure HTTP2Response {response = r, respBody}
+
+http2RequestTimeout :: HTTP2ClientConfig -> Maybe Int -> Int
+http2RequestTimeout HTTP2ClientConfig {connTimeout} = maybe connTimeout (connTimeout +)
+
+runHTTP2Client :: forall a. T.Supported -> Maybe XS.CertificateStore -> TransportClientConfig -> BufferSize -> Maybe ByteString -> TransportHost -> ServiceName -> Maybe C.KeyHash -> (SessionId -> H.Client a) -> IO a
+runHTTP2Client tlsParams caStore tcConfig bufferSize proxyUsername host port keyHash client =
+  runTLSTransportClient tlsParams caStore tcConfig proxyUsername host port keyHash $ withHTTP2 bufferSize run
+  where
+    run :: H.Config -> SessionId -> IO a
+    run cfg = H.run (ClientConfig "https" (strEncode host) 20) cfg . client

src/Simplex/Messaging/Transport/HTTP2/Server.hs

@@ -6,22 +6,23 @@ module Simplex.Messaging.Transport.HTTP2.Server where
 import Control.Concurrent.Async (Async, async, uninterruptibleCancel)
 import Control.Concurrent.STM
 import Control.Monad
-import Data.ByteString (ByteString)
-import qualified Data.ByteString.Char8 as B
-import Network.HPACK (HeaderTable)
-import Network.HTTP2.Server (Aux, PushPromise, Request, Response)
+import Network.HPACK (BufferSize)
+import Network.HTTP2.Server (Request, Response)
 import qualified Network.HTTP2.Server as H
 import Network.Socket
 import qualified Network.TLS as T
 import Numeric.Natural (Natural)
-import Simplex.Messaging.Transport.HTTP2 (withTlsConfig)
+import Simplex.Messaging.Transport (SessionId)
+import Simplex.Messaging.Transport.HTTP2
 import Simplex.Messaging.Transport.Server (loadSupportedTLSServerParams, runTransportServer)
 
-type HTTP2ServerFunc = (Request -> (Response -> IO ()) -> IO ())
+type HTTP2ServerFunc = SessionId -> Request -> (Response -> IO ()) -> IO ()
 
 data HTTP2ServerConfig = HTTP2ServerConfig
   { qSize :: Natural,
     http2Port :: ServiceName,
+    bufferSize :: BufferSize,
+    bodyHeadSize :: Int,
     serverSupported :: T.Supported,
     caCertificateFile :: FilePath,
     privateKeyFile :: FilePath,
@@ -31,9 +32,9 @@ data HTTP2ServerConfig = HTTP2ServerConfig
   deriving (Show)
 
 data HTTP2Request = HTTP2Request
-  { request :: Request,
-    reqBody :: ByteString,
-    reqTrailers :: Maybe HeaderTable,
+  { sessionId :: SessionId,
+    request :: Request,
+    reqBody :: HTTP2Body,
     sendResponse :: Response -> IO ()
   }
 
@@ -42,30 +43,24 @@ data HTTP2Server = HTTP2Server
     reqQ :: TBQueue HTTP2Request
   }
 
+-- This server is for testing only, it processes all requests in a single queue.
 getHTTP2Server :: HTTP2ServerConfig -> IO HTTP2Server
-getHTTP2Server HTTP2ServerConfig {qSize, http2Port, serverSupported, caCertificateFile, certificateFile, privateKeyFile, logTLSErrors} = do
+getHTTP2Server HTTP2ServerConfig {qSize, http2Port, bufferSize, bodyHeadSize, serverSupported, caCertificateFile, certificateFile, privateKeyFile, logTLSErrors} = do
   tlsServerParams <- loadSupportedTLSServerParams serverSupported caCertificateFile certificateFile privateKeyFile
   started <- newEmptyTMVarIO
   reqQ <- newTBQueueIO qSize
   action <- async $
-    runHTTP2Server started http2Port tlsServerParams logTLSErrors $ \r sendResponse -> do
-      reqBody <- getRequestBody r ""
-      reqTrailers <- H.getRequestTrailers r
-      atomically $ writeTBQueue reqQ HTTP2Request {request = r, reqBody, reqTrailers, sendResponse}
+    runHTTP2Server started http2Port bufferSize tlsServerParams logTLSErrors $ \sessionId r sendResponse -> do
+      reqBody <- getHTTP2Body r bodyHeadSize
+      atomically $ writeTBQueue reqQ HTTP2Request {sessionId, request = r, reqBody, sendResponse}
   void . atomically $ takeTMVar started
   pure HTTP2Server {action, reqQ}
-  where
-    getRequestBody :: Request -> ByteString -> IO ByteString
-    getRequestBody r s =
-      H.getRequestBodyChunk r >>= \chunk ->
-        if B.null chunk then pure s else getRequestBody r $ s <> chunk
 
 closeHTTP2Server :: HTTP2Server -> IO ()
 closeHTTP2Server = uninterruptibleCancel . action
 
-runHTTP2Server :: TMVar Bool -> ServiceName -> T.ServerParams -> Bool -> HTTP2ServerFunc -> IO ()
-runHTTP2Server started port serverParams logTLSErrors http2Server =
-  runTransportServer started port serverParams logTLSErrors $ \c -> withTlsConfig c 16384 (`H.run` server)
+runHTTP2Server :: TMVar Bool -> ServiceName -> BufferSize -> T.ServerParams -> Bool -> HTTP2ServerFunc -> IO ()
+runHTTP2Server started port bufferSize serverParams logTLSErrors http2Server =
+  runTransportServer started port serverParams logTLSErrors $ withHTTP2 bufferSize run
   where
-    server :: Request -> Aux -> (Response -> [PushPromise] -> IO ()) -> IO ()
-    server req _aux sendResp = http2Server req (`sendResp` [])
+    run cfg sessId = H.run cfg $ \req _aux sendResp -> http2Server sessId req (`sendResp` [])

src/Simplex/Messaging/Transport/Server.hs

@@ -1,5 +1,7 @@
 {-# LANGUAGE DuplicateRecordFields #-}
 {-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE NamedFieldPuns #-}
+{-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 
 module Simplex.Messaging.Transport.Server
@@ -12,11 +14,15 @@ module Simplex.Messaging.Transport.Server
   )
 where
 
+import Control.Applicative ((<|>))
 import Control.Concurrent.STM (stateTVar)
+import Control.Logger.Simple
 import Control.Monad.Except
 import Control.Monad.IO.Unlift
 import qualified Crypto.Store.X509 as SX
 import Data.Default (def)
+import Data.List (find)
+import Data.Maybe (fromJust)
 import qualified Data.X509 as X
 import Data.X509.Validation (Fingerprint (..))
 import qualified Data.X509.Validation as XV
@@ -25,7 +31,7 @@ import qualified Network.TLS as T
 import Simplex.Messaging.TMap (TMap)
 import qualified Simplex.Messaging.TMap as TM
 import Simplex.Messaging.Transport
-import Simplex.Messaging.Util (catchAll_)
+import Simplex.Messaging.Util (catchAll_, tshow)
 import System.Exit (exitFailure)
 import System.Mem.Weak (Weak, deRefWeak)
 import UnliftIO.Concurrent
@@ -70,14 +76,18 @@ startTCPServer started port = withSocketsDo $ resolve >>= open >>= setStarted
   where
     resolve =
       let hints = defaultHints {addrFlags = [AI_PASSIVE], addrSocketType = Stream}
-       in head <$> getAddrInfo (Just hints) Nothing (Just port)
+       in select <$> getAddrInfo (Just hints) Nothing (Just port)
+    select as = fromJust $ family AF_INET6 <|> family AF_INET
+      where
+        family f = find ((== f) . addrFamily) as
     open addr = do
       sock <- socket (addrFamily addr) (addrSocketType addr) (addrProtocol addr)
       setSocketOption sock ReuseAddr 1
       withFdSocket sock setCloseOnExecIfNeeded
+      logInfo $ "binding to " <> tshow (addrAddress addr)
       bind sock $ addrAddress addr
       listen sock 1024
-      return sock
+      pure sock
     setStarted sock = atomically (tryPutTMVar started True) >> pure sock
 
 loadTLSServerParams :: FilePath -> FilePath -> FilePath -> IO T.ServerParams