remove IQResponseTimeout from IQResponse

IQResponseTimeout does not model an XMPP type but is instead an implementation specific signal that a user-set timeout has occured. Removing it keeps our representation closer to the defined protocol.

add IQSendError to keep the result of sendIQ' clear

source/Network/Xmpp/Concurrent.hs

@@ -117,7 +117,7 @@ handleIQ iqHands out sta = do
         case Map.updateLookupWithKey (\_ _ -> Nothing) (iqID iq) byID of
             (Nothing, _) -> return () -- We are not supposed to send an error.
             (Just tmvar, byID') -> do
-                let answer = either IQResponseError IQResponseResult iq
+                let answer = Just $ either IQResponseError IQResponseResult iq
                 _ <- tryPutTMVar tmvar answer -- Don't block.
                 writeTVar handlers (byNS, byID')
       where

source/Network/Xmpp/Concurrent/IQ.hs

@@ -49,7 +49,7 @@ sendIQ timeOut to tp lang body session = do -- TODO: Add timeout
         else return Nothing
   where
     doTimeOut handlers iqid var = atomically $ do
-      p <- tryPutTMVar var IQResponseTimeout
+      p <- tryPutTMVar var Nothing
       when p $ do
           (byNS, byId) <- readTVar (iqHandlers session)
           writeTVar handlers (byNS, Map.delete iqid byId)
@@ -62,11 +62,11 @@ sendIQ' :: Maybe Integer
         -> Maybe LangTag
         -> Element
         -> Session
-        -> IO (Maybe IQResponse)
+        -> IO (Either IQSendError IQResponse)
 sendIQ' timeout to tp lang body session = do
     ref <- sendIQ timeout to tp lang body session
-    maybe (return Nothing) (fmap Just . atomically . takeTMVar) ref
-
+    maybe (return $ Left IQSendError) (fmap (maybe (Left IQTimeOut) Right)
+                                     . atomically . takeTMVar) ref
 
 -- | Retrieves an IQ listener channel. If the namespace/'IQRequestType' is not
 -- already handled, a new 'TChan' is created and returned as a 'Right' value.

source/Network/Xmpp/Concurrent/Types.hs

@@ -97,7 +97,7 @@ data Session = Session
 -- TMVars of and TMVars for expected IQ responses (the second Text represent a
 -- stanza identifier.
 type IQHandlers = ( Map.Map (IQRequestType, Text) (TChan IQRequestTicket)
-                  , Map.Map Text (TMVar IQResponse)
+                  , Map.Map Text (TMVar (Maybe IQResponse))
                   )
 
 -- | Contains whether or not a reply has been sent, and the IQ request body to
@@ -110,3 +110,8 @@ data IQRequestTicket = IQRequestTicket
                       -- but failed (e.g. there is a connection failure)
     , iqRequestBody :: IQRequest
     }
+
+-- | Error that can occur during sendIQ'
+data IQSendError = IQSendError -- There was an error sending the IQ stanza
+                 | IQTimeOut -- No answer was received during the allotted time
+                   deriving (Show, Eq)

source/Network/Xmpp/IM/Roster.hs

@@ -33,7 +33,7 @@ timeout = Just 3000000 -- 3 seconds
 
 -- | Push a roster item to the server. The values for approved and ask are
 -- ignored and all values for subsciption except "remove" are ignored
-rosterPush :: Item -> Session -> IO (Maybe IQResponse)
+rosterPush :: Item -> Session -> IO (Either IQSendError IQResponse)
 rosterPush item session = do
     let el = pickleElem xpQuery (Query Nothing [fromItem item])
     sendIQ' timeout  Nothing Set Nothing el session
@@ -45,7 +45,7 @@ rosterAdd :: Jid -- ^ JID of the item
           -> Maybe Text -- ^ Name alias
           -> [Text] -- ^ Groups (duplicates will be removed)
           -> Session
-          -> IO (Maybe IQResponse)
+          -> IO (Either IQSendError IQResponse)
 rosterAdd j n gs session = do
     let el = pickleElem xpQuery (Query Nothing
                                  [QueryItem { qiApproved = Nothing
@@ -67,7 +67,7 @@ rosterRemove j sess = do
         Just _ -> do
             res <- rosterPush (Item False False j Nothing Remove []) sess
             case res of
-                Just (IQResponseResult IQResult{}) -> return True
+                Right (IQResponseResult IQResult{}) -> return True
                 _ -> return False
 
 -- | Retrieve the current Roster state
@@ -82,7 +82,7 @@ initRoster session = do
                                                           else Nothing ) session
     case mbRoster of
         Nothing -> errorM "Pontarius.Xmpp"
-                          "Server did not return a roster"
+                          "Server did not return a roster: "
         Just roster -> atomically $ writeTVar (rosterRef session) roster
 
 handleRoster :: TVar Roster -> StanzaHandler
@@ -129,22 +129,19 @@ retrieveRoster mbOldRoster sess = do
                    (pickleElem xpQuery (Query version []))
                    sess
     case res of
-        Nothing -> do
-            errorM "Pontarius.Xmpp.Roster" "getRoster: sending stanza failed"
+        Left e -> do
+            errorM "Pontarius.Xmpp.Roster" $ "getRoster: " ++ show e
             return Nothing
-        Just (IQResponseResult (IQResult{iqResultPayload = Just ros}))
+        Right (IQResponseResult (IQResult{iqResultPayload = Just ros}))
             -> case unpickleElem xpQuery ros of
             Left _e -> do
                 errorM "Pontarius.Xmpp.Roster" "getRoster: invalid query element"
                 return Nothing
             Right ros' -> return . Just $ toRoster ros'
-        Just (IQResponseResult (IQResult{iqResultPayload = Nothing})) -> do
+        Right (IQResponseResult (IQResult{iqResultPayload = Nothing})) -> do
             return mbOldRoster
                 -- sever indicated that no roster updates are necessary
-        Just IQResponseTimeout -> do
-            errorM "Pontarius.Xmpp.Roster" "getRoster: request timed out"
-            return Nothing
-        Just (IQResponseError e) -> do
+        Right (IQResponseError e) -> do
             errorM "Pontarius.Xmpp.Roster" $ "getRoster: server returned error"
                    ++ show e
             return Nothing

source/Network/Xmpp/Types.hs

@@ -119,10 +119,9 @@ data IQRequest = IQRequest { iqRequestID      :: !Text
 data IQRequestType = Get | Set deriving (Eq, Ord, Read, Show)
 
 -- | A "response" Info/Query (IQ) stanza is either an 'IQError', an IQ stanza
--- of  type "result" ('IQResult') or a Timeout.
+-- of  type "result" ('IQResult')
 data IQResponse = IQResponseError IQError
                 | IQResponseResult IQResult
-                | IQResponseTimeout
                 deriving Show
 
 -- | The (non-error) answer to an IQ request.