BrokerClient: skip unsolicited requests

src/ATrade/Broker/Client.hs

@@ -34,7 +34,7 @@ import           Control.Concurrent             (MVar, ThreadId, forkIO,
                                                  killThread, newEmptyMVar,
                                                  putMVar, readMVar, takeMVar,
                                                  threadDelay, tryReadMVar,
-                                                 yield)
+                                                 tryTakeMVar, yield)
 import           Control.Concurrent.BoundedChan ()
 import           Control.Concurrent.MVar        (tryPutMVar)
 import           Control.Exception              (SomeException, bracket, catch,
@@ -155,12 +155,16 @@ brokerClientThread socketIdentity ep cmd comp killMv notificationCallbacks logge
 
     handleMessage :: MVar (BrokerServerRequest, MVar BrokerServerResponse, UTCTime) -> BrokerClientEvent -> IO ()
     handleMessage respVar (IncomingResponse resp)    = do
-      log Debug "Broker.Client" $ TL.toStrict $ [t|Incoming message: %?|] resp
-      (req, respVar, _) <- takeMVar respVar
+      log Debug "Broker.Client" $ TL.toStrict $ [t|Incoming response: %?|] resp
+      maybePending <- tryTakeMVar respVar
+      case maybePending of
+        Just (req, respVar, _) -> do
           log Debug "Broker.Client" $ TL.toStrict $ [t|Pending request: %?|] req
           if getRequestId req == getResponseRequestId resp
             then putMVar respVar resp
             else log Warning "Broker.Client" $ TL.toStrict $ [t|Request ID mismatch: %?/%?|] (getRequestId req) (getResponseRequestId resp)
+        _ -> log Warning "Broker.Client" $ TL.toStrict $ [t|Ignore unsolicited response|]
+
     handleMessage _ (IncomingNotification notif) = callNotificationCallbacks notif
 
     callNotificationCallbacks notif = mapM_ (\cb -> cb notif) notificationCallbacks