BrokerServer: replaced poll with timeout $ readMulti

src/ATrade/Broker/Server.hs

@@ -137,31 +137,29 @@ brokerServerThread state = finally brokerServerThread' cleanup
   where
     brokerServerThread' = whileM_ (fmap killMvar (readIORef state) >>= fmap isNothing . tryReadMVar) $ do
       sock <- bsSocket <$> readIORef state
-      evs <- poll 200 [Sock sock [In] Nothing] 
-      when ((L.length . L.head) evs > 0) $ do
-        msg <- receiveMulti sock
-        case msg of
-          [peerId, _, payload] ->
-            case decode . BL.fromStrict $ payload of
-              Just request -> do
-                let sqnum = requestSqnum request
-                -- Here, we should check if previous packet sequence number is the same
-                -- If it is, we should resend previous response
-                lastPackMap <- lastPacket <$> readIORef state
-                case shouldResend sqnum peerId lastPackMap of
-                  Just response -> sendMessage sock peerId response -- Resend
-                  Nothing -> do
-                    -- Handle incoming request, send response
-                    response <- handleMessage peerId request
-                    sendMessage sock peerId response
-                    -- and store response in case we'll need to resend it
-                    atomicMapIORef state (\s -> s { lastPacket = M.insert peerId (sqnum, response) (lastPacket s)})
-              Nothing -> do
-                -- If we weren't able to parse request, we should send error
-                -- but shouldn't update lastPacket
-                let response = ResponseError "Invalid request"
-                sendMessage sock peerId response
-          _ -> warningM "Broker.Server" ("Invalid packet received: " ++ show msg)
+      msg <- timeout 1000000 $ receiveMulti sock
+      case msg of
+        Just [peerId, _, payload] ->
+          case decode . BL.fromStrict $ payload of
+            Just request -> do
+              let sqnum = requestSqnum request
+              -- Here, we should check if previous packet sequence number is the same
+              -- If it is, we should resend previous response
+              lastPackMap <- lastPacket <$> readIORef state
+              case shouldResend sqnum peerId lastPackMap of
+                Just response -> sendMessage sock peerId response -- Resend
+                Nothing -> do
+                  -- Handle incoming request, send response
+                  response <- handleMessage peerId request
+                  sendMessage sock peerId response
+                  -- and store response in case we'll need to resend it
+                  atomicMapIORef state (\s -> s { lastPacket = M.insert peerId (sqnum, response) (lastPacket s)})
+            Nothing -> do
+              -- If we weren't able to parse request, we should send error
+              -- but shouldn't update lastPacket
+              let response = ResponseError "Invalid request"
+              sendMessage sock peerId response
+        _ -> warningM "Broker.Server" ("Invalid packet received: " ++ show msg)
 
     shouldResend sqnum peerId lastPackMap = case M.lookup peerId lastPackMap of
       Just (lastSqnum, response) -> if sqnum == lastSqnum