added some preliminary IQ-handling support

src/Network/XMPP/Concurrent.hs

@@ -42,6 +42,9 @@ data Thread = Thread { messagesRef :: IORef (Maybe (TChan Message))
                      , mShadow :: TChan Message -- the original chan
                      , pShadow :: TChan Presence -- the original chan
                      , outCh :: TChan Stanza
+                     , iqHandlers :: TVar ( Map.Map (IQType, Text) (TChan IQ)
+                                          , Map.Map Text (TMVar IQ)
+                                          )
                      }
 
 type XMPPThread a = ReaderT Thread IO a
@@ -97,14 +100,34 @@ startThreads = do
                   Set -> case Map.lookup (Set, iqNS) byNS of
                     Nothing -> return () -- TODO: send error stanza
                     Just ch -> writeTChan ch iq
-                  Result -> case Map.lookup (iqId iq) byID of
-                    Nothing -> return () -- ?? Should we be sending an error?
-                    Just tmvar -> putTMVar tmvar iq
+                  Result -> case Map.updateLookupWithKey (\_ _ -> Nothing)
+                                  (iqId iq) byID of
+                    (Nothing, _) -> return () -- we are not supposed
+                                              -- to send an error
+                    (Just tmvar, byID')  -> do
+                        tryPutTMVar tmvar iq -- don't block
+                        writeTVar handlers (byNS, byID)
+
       killConnection writeLock threads = liftIO $ do
         atomically $ takeTMVar writeLock
         forM threads killThread
         return()
 
+addIQChan :: IQType -> Text -> XMPPThread (Bool, TChan IQ)
+addIQChan tp ns = do
+  handlers <- asks iqHandlers
+  liftIO . atomically $ do
+    (byNS, byID) <- readTVar handlers
+    iqCh <- newTChan
+    let (present, byNS') = Map.insertLookupWithKey' (\_ new _ -> new)
+                                                     (tp,ns) iqCh byNS
+    writeTVar handlers (byNS', byID)
+    return $ case present of
+               Nothing -> (False, iqCh)
+               Just iqCh' -> (True, iqCh')
+
+
+
 runThreaded  :: XMPPThread a
                 -> XMPPMonad ThreadId
 runThreaded a = do
@@ -112,7 +135,7 @@ runThreaded a = do
     workermCh <- liftIO . newIORef $ Just mC
     workerpCh <- liftIO . newIORef $ Just pC
     worker <- liftIO . forkIO $ do
-              runReaderT a (Thread workermCh workerpCh mC pC outC)
+              runReaderT a (Thread workermCh workerpCh mC pC outC hand)
               return ()
     return worker
 
@@ -215,3 +238,4 @@ connPersist pushBS lock = forever $ do
   threadDelay 30000000
 
 
+