agent: send UP from initial subscriptions

src/Simplex/Messaging/Agent/Client.hs

@@ -170,7 +170,7 @@ 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 (isJust, isNothing, listToMaybe)
+import Data.Maybe (catMaybes, isJust, isNothing, listToMaybe)
 import Data.Set (Set)
 import qualified Data.Set as S
 import Data.Text (Text)
@@ -678,15 +678,12 @@ smpClientDisconnected c@AgentClient {active, smpClients, smpProxiedRelays} tSess
     serverDown :: ([RcvQueue], [ConnId]) -> IO ()
     serverDown (qs, conns) = whenM (readTVarIO active) $ do
       incClientStat' c userId client "DISCONNECT" ""
-      notifySub "" $ hostEvent' DISCONNECT client
-      unless (null conns) $ notifySub "" $ DOWN srv conns
+      notifySub c "" $ hostEvent' DISCONNECT client
+      unless (null conns) $ notifySub c "" $ DOWN srv conns
       unless (null qs) $ do
         atomically $ mapM_ (releaseGetLock c) qs
         runReaderT (resubscribeSMPSession c tSess) env
 
-    notifySub :: forall e. AEntityI e => ConnId -> ACommand 'Agent e -> IO ()
-    notifySub connId cmd = atomically $ writeTBQueue (subQ c) ("", connId, APC (sAEntity @e) cmd)
-
 resubscribeSMPSession :: AgentClient -> SMPTransportSession -> AM' ()
 resubscribeSMPSession c@AgentClient {smpSubWorkers, workerSeq} tSess =
   atomically getWorkerVar >>= mapM_ (either newSubWorker (\_ -> pure ()))
@@ -721,21 +718,22 @@ reconnectSMPClient c tSess@(_, srv, _) qs = handleNotify $ do
   (rs, sessId_) <- subscribeQueues c $ L.toList qs
   let (errs, okConns) = partitionEithers $ map (\(RcvQueue {connId}, r) -> bimap (connId,) (const connId) r) rs
       conns = filter (`M.notMember` cs) okConns
-  unless (null conns) $ notifySub "" $ UP srv conns
+  unless (null conns) $ notifySub c "" $ UP srv conns
   let (tempErrs, finalErrs) = partition (temporaryAgentError . snd) errs
-  mapM_ (\(connId, e) -> notifySub connId $ ERR e) finalErrs
+  mapM_ (\(connId, e) -> notifySub c connId $ ERR e) finalErrs
   forM_ (listToMaybe tempErrs) $ \(connId, e) -> do
     when (null okConns && M.null cs && null finalErrs) . liftIO $
       forM_ sessId_ $ \sessId -> do
         -- We only close the client session that was used to subscribe.
         v_ <- atomically $ ifM (activeClientSession c tSess sessId) (TM.lookupDelete tSess $ smpClients c) (pure Nothing)
         mapM_ (closeClient_ c) v_
-    notifySub connId $ ERR e
+    notifySub c connId $ ERR e
   where
     handleNotify :: AM' () -> AM' ()
-    handleNotify = E.handleAny $ notifySub "" . ERR . INTERNAL . show
-    notifySub :: forall e. AEntityI e => ConnId -> ACommand 'Agent e -> AM' ()
-    notifySub connId cmd = atomically $ writeTBQueue (subQ c) ("", connId, APC (sAEntity @e) cmd)
+    handleNotify = E.handleAny $ notifySub c "" . ERR . INTERNAL . show
+
+notifySub :: forall e m. (AEntityI e, MonadIO m) => AgentClient -> ConnId -> ACommand 'Agent e -> m ()
+notifySub c connId cmd = atomically $ writeTBQueue (subQ c) ("", connId, APC (sAEntity @e) cmd)
 
 getNtfServerClient :: AgentClient -> NtfTransportSession -> AM NtfClient
 getNtfServerClient c@AgentClient {active, ntfClients, workerSeq} tSess@(userId, srv, _) = do
@@ -1291,14 +1289,10 @@ newRcvQueue c userId connId (ProtoServerWithAuth srv auth) vRange subMode = do
       qUri = SMPQueueUri vRange $ SMPQueueAddress srv sndId e2eDhKey
   pure (rq, qUri, tSess, sessId)
 
-processSubResult :: AgentClient -> RcvQueue -> Either SMPClientError () -> STM ()
+processSubResult :: AgentClient -> RcvQueue -> Either SMPClientError () -> STM (Maybe ConnId)
 processSubResult c rq@RcvQueue {connId} = \case
-  Left e ->
-    unless (temporaryClientError e) $
-      failSubscription c rq e
-  Right () ->
-    whenM (hasPendingSubscription c connId) $
-      addSubscription c rq
+  Left e -> Nothing <$ unless (temporaryClientError e) (failSubscription c rq e)
+  Right () -> ifM (hasPendingSubscription c connId) (Just connId <$ addSubscription c rq) (pure Nothing)
 
 temporaryAgentError :: AgentErrorType -> Bool
 temporaryAgentError = \case
@@ -1349,23 +1343,26 @@ subscribeQueues c qs = do
     subscribeQueues_ :: Env -> TVar (Maybe SessionId) -> SMPClient -> NonEmpty RcvQueue -> IO (BatchResponses SMPClientError ())
     subscribeQueues_ env session smp qs' = do
       rs <- sendBatch subscribeSMPQueues smp qs'
-      active <-
+      (active, subResults) <-
         atomically $
           ifM
             (activeClientSession c tSess sessId)
-            (writeTVar session (Just sessId) >> processSubResults rs $> True)
-            (pure False)
+            (writeTVar session (Just sessId) >> ((True,) <$> processSubResults rs))
+            (pure (False, []))
       if active
-        then when (hasTempErrors rs) resubscribe $> rs
+        then do
+          when (any isNothing subResults) resubscribe
+          let up = catMaybes $ L.toList subResults
+          unless (null up) $ notifySub c "" $ UP srv up
+          pure rs
         else do
           logWarn "subcription batch result for replaced SMP client, resubscribing"
           resubscribe $> L.map (second $ \_ -> Left PCENetworkError) rs
       where
-        tSess = transportSession' smp
+        tSess@(_, srv, _) = transportSession' smp
         sessId = sessionId $ thParams smp
-        hasTempErrors = any (either temporaryClientError (const False) . snd)
-        processSubResults :: NonEmpty (RcvQueue, Either SMPClientError ()) -> STM ()
-        processSubResults = mapM_ $ uncurry $ processSubResult c
+        processSubResults :: NonEmpty (RcvQueue, Either SMPClientError ()) -> STM (NonEmpty (Maybe ConnId))
+        processSubResults = mapM (uncurry $ processSubResult c)
         resubscribe = resubscribeSMPSession c tSess `runReaderT` env
 
 activeClientSession :: AgentClient -> SMPTransportSession -> SessionId -> STM Bool