243e99717d
This is not perfect, because on loss of connection, we do not currently immediately detect it and stop the client. It has to time out, and then the buddy list will clear. The NetWatcher should detect disconnects too..
309 lines
11 KiB
Haskell
309 lines
11 KiB
Haskell
{- git-annex XMPP client
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-
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- Copyright 2012 Joey Hess <joey@kitenet.net>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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module Assistant.Threads.XMPPClient where
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import Assistant.Common
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import Assistant.XMPP
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import Assistant.XMPP.Client
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import Assistant.NetMessager
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import Assistant.Types.NetMessager
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import Assistant.Types.Buddies
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import Assistant.XMPP.Buddies
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import Assistant.Sync
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import Assistant.DaemonStatus
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import qualified Remote
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import Utility.ThreadScheduler
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import Assistant.WebApp (UrlRenderer, renderUrl)
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import Assistant.WebApp.Types
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import Assistant.Alert
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import Assistant.Pairing
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import Assistant.XMPP.Git
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import Annex.UUID
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import Network.Protocol.XMPP
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import Control.Concurrent
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import qualified Data.Text as T
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import qualified Data.Set as S
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import qualified Data.Map as M
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import qualified Git.Branch
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import Data.Time.Clock
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{- Whether to include verbose protocol dump in debug output. -}
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protocolDebug :: Bool
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protocolDebug = False
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xmppClientThread :: UrlRenderer -> NamedThread
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xmppClientThread urlrenderer = namedThread "XMPPClient" $
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restartableClient . xmppClient urlrenderer =<< getAssistant id
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{- Runs the client, handing restart events. -}
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restartableClient :: (XMPPCreds -> IO ()) -> Assistant ()
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restartableClient a = forever $ go =<< liftAnnex getXMPPCreds
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where
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go Nothing = waitNetMessagerRestart
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go (Just creds) = do
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tid <- liftIO $ forkIO $ a creds
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waitNetMessagerRestart
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liftIO $ killThread tid
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xmppClient :: UrlRenderer -> AssistantData -> XMPPCreds -> IO ()
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xmppClient urlrenderer d creds =
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retry (runclient creds) =<< getCurrentTime
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where
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liftAssistant = runAssistant d
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inAssistant = liftIO . liftAssistant
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{- When the client exits, it's restarted;
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- if it keeps failing, back off to wait 5 minutes before
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- trying it again. -}
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retry client starttime = do
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{- The buddy list starts empty each time
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- the client connects, so that stale info
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- is not retained. -}
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liftAssistant $
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updateBuddyList (const noBuddies) <<~ buddyList
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e <- client
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liftAssistant $ modifyDaemonStatus_ $ \s -> s
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{ xmppClientID = Nothing }
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now <- getCurrentTime
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if diffUTCTime now starttime > 300
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then do
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liftAssistant $ debug ["connection lost; reconnecting", show e]
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retry client now
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else do
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liftAssistant $ debug ["connection failed; will retry", show e]
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threadDelaySeconds (Seconds 300)
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retry client =<< getCurrentTime
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runclient c = liftIO $ connectXMPP c $ \jid -> do
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selfjid <- bindJID jid
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putStanza gitAnnexSignature
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inAssistant $ do
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modifyDaemonStatus_ $ \s -> s
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{ xmppClientID = Just $ xmppJID creds }
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debug ["connected", show selfjid]
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xmppThread $ receivenotifications selfjid
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forever $ do
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a <- inAssistant $ relayNetMessage selfjid
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a
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receivenotifications selfjid = forever $ do
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l <- decodeStanza selfjid <$> getStanza
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when protocolDebug $
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inAssistant $ debug ["received:", show l]
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mapM_ (handle selfjid) l
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handle selfjid (PresenceMessage p) = do
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void $ inAssistant $
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updateBuddyList (updateBuddies p) <<~ buddyList
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resendImportantMessages selfjid p
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handle _ (GotNetMessage QueryPresence) = putStanza gitAnnexSignature
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handle _ (GotNetMessage (NotifyPush us)) = void $ inAssistant $ pull us
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handle selfjid (GotNetMessage (PairingNotification stage c u)) =
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maybe noop (inAssistant . pairMsgReceived urlrenderer stage u selfjid) (parseJID c)
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handle _ (GotNetMessage m@(Pushing _ pushstage))
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| isPushInitiation pushstage = inAssistant $
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unlessM (queueNetPushMessage m) $
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void $ forkIO <~> handlePushInitiation m
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| otherwise = void $ inAssistant $ queueNetPushMessage m
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handle _ (Ignorable _) = noop
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handle _ (Unknown _) = noop
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handle _ (ProtocolError _) = noop
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resendImportantMessages selfjid (Presence { presenceFrom = Just jid }) = do
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let c = formatJID jid
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(stored, sent) <- inAssistant $
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checkImportantNetMessages (formatJID (baseJID jid), c)
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forM_ (S.toList $ S.difference stored sent) $ \msg -> do
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inAssistant $ debug ["sending to new client:", show c, show msg]
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a <- inAssistant $ convertNetMsg (readdressNetMessage msg c) selfjid
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a
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inAssistant $ sentImportantNetMessage msg c
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resendImportantMessages _ _ = noop
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data XMPPEvent
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= GotNetMessage NetMessage
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| PresenceMessage Presence
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| Ignorable ReceivedStanza
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| Unknown ReceivedStanza
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| ProtocolError ReceivedStanza
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deriving Show
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{- Decodes an XMPP stanza into one or more events. -}
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decodeStanza :: JID -> ReceivedStanza -> [XMPPEvent]
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decodeStanza selfjid s@(ReceivedPresence p)
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| presenceType p == PresenceError = [ProtocolError s]
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| presenceFrom p == Nothing = [Ignorable s]
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| presenceFrom p == Just selfjid = [Ignorable s]
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| otherwise = maybe [PresenceMessage p] decode (gitAnnexTagInfo p)
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where
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decode i
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| tagAttr i == pushAttr = impliedp $ GotNetMessage $ NotifyPush $
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decodePushNotification (tagValue i)
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| tagAttr i == queryAttr = impliedp $ GotNetMessage QueryPresence
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| otherwise = [Unknown s]
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{- Things sent via presence imply a presence message,
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- along with their real meaning. -}
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impliedp v = [PresenceMessage p, v]
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decodeStanza selfjid s@(ReceivedMessage m)
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| messageFrom m == Nothing = [Ignorable s]
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| messageFrom m == Just selfjid = [Ignorable s]
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| messageType m == MessageError = [ProtocolError s]
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| otherwise = [fromMaybe (Unknown s) (GotNetMessage <$> decodeMessage m)]
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decodeStanza _ s = [Unknown s]
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{- Waits for a NetMessager message to be sent, and relays it to XMPP.
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-
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- Chat messages must be directed to specific clients, not a base
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- account JID, due to git-annex clients using a negative presence priority.
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- PairingNotification messages are always directed at specific
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- clients, but Pushing messages are sometimes not, and need to be exploded
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- out to specific clients.
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-
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- Important messages, not directed at any specific client,
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- are cached to be sent later when additional clients connect.
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-}
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relayNetMessage :: JID -> Assistant (XMPP ())
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relayNetMessage selfjid = do
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msg <- waitNetMessage
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when protocolDebug $
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debug ["sending:", show msg]
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handleImportant msg
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convert msg
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where
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handleImportant msg = case parseJID =<< isImportantNetMessage msg of
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Just tojid
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| tojid == baseJID tojid ->
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storeImportantNetMessage msg (formatJID tojid) $
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\c -> (baseJID <$> parseJID c) == Just tojid
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_ -> noop
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convert (Pushing c pushstage) = withOtherClient selfjid c $ \tojid -> do
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if tojid == baseJID tojid
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then do
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clients <- maybe [] (S.toList . buddyAssistants)
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<$> getBuddy (genBuddyKey tojid) <<~ buddyList
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when protocolDebug $
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debug ["exploded undirected message to clients", show clients]
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return $ forM_ (clients) $ \(Client jid) ->
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putStanza $ pushMessage pushstage jid selfjid
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else return $ putStanza $ pushMessage pushstage tojid selfjid
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convert msg = convertNetMsg msg selfjid
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{- Converts a NetMessage to an XMPP action. -}
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convertNetMsg :: NetMessage -> JID -> Assistant (XMPP ())
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convertNetMsg msg selfjid = convert msg
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where
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convert (NotifyPush us) = return $ putStanza $ pushNotification us
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convert QueryPresence = return $ putStanza presenceQuery
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convert (PairingNotification stage c u) = withOtherClient selfjid c $ \tojid -> do
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changeBuddyPairing tojid True
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return $ putStanza $ pairingNotification stage u tojid selfjid
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convert (Pushing c pushstage) = withOtherClient selfjid c $ \tojid ->
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return $ putStanza $ pushMessage pushstage tojid selfjid
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withOtherClient :: JID -> ClientID -> (JID -> Assistant (XMPP ())) -> (Assistant (XMPP ()))
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withOtherClient selfjid c a = case parseJID c of
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Nothing -> return noop
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Just tojid
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| tojid == selfjid -> return noop
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| otherwise -> a tojid
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withClient :: ClientID -> (JID -> XMPP ()) -> XMPP ()
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withClient c a = maybe noop a $ parseJID c
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{- Runs a XMPP action in a separate thread, using a session to allow it
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- to access the same XMPP client. -}
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xmppThread :: XMPP () -> XMPP ()
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xmppThread a = do
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s <- getSession
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void $ liftIO $ forkIO $
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void $ runXMPP s a
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{- We only pull from one remote out of the set listed in the push
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- notification, as an optimisation.
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-
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- Note that it might be possible (though very unlikely) for the push
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- notification to take a while to be sent, and multiple pushes happen
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- before it is sent, so it includes multiple remotes that were pushed
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- to at different times.
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-
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- It could then be the case that the remote we choose had the earlier
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- push sent to it, but then failed to get the later push, and so is not
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- fully up-to-date. If that happens, the pushRetryThread will come along
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- and retry the push, and we'll get another notification once it succeeds,
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- and pull again. -}
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pull :: [UUID] -> Assistant ()
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pull [] = noop
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pull us = do
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rs <- filter matching . syncGitRemotes <$> getDaemonStatus
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debug $ "push notification for" : map (fromUUID . Remote.uuid ) rs
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pullone rs =<< liftAnnex (inRepo Git.Branch.current)
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where
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matching r = Remote.uuid r `S.member` s
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s = S.fromList us
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pullone [] _ = noop
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pullone (r:rs) branch =
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unlessM (all id . fst <$> manualPull branch [r]) $
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pullone rs branch
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pairMsgReceived :: UrlRenderer -> PairStage -> UUID -> JID -> JID -> Assistant ()
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pairMsgReceived urlrenderer PairReq theiruuid selfjid theirjid
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| baseJID selfjid == baseJID theirjid = autoaccept
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| otherwise = do
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knownjids <- catMaybes . map (parseJID . getXMPPClientID)
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. filter isXMPPRemote . syncRemotes <$> getDaemonStatus
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if any (== baseJID theirjid) knownjids
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then autoaccept
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else showalert
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where
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-- PairReq from another client using our JID, or the JID of
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-- any repo we're already paired with is automatically accepted.
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autoaccept = do
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selfuuid <- liftAnnex getUUID
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sendNetMessage $
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PairingNotification PairAck (formatJID theirjid) selfuuid
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finishXMPPPairing theirjid theiruuid
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-- Show an alert to let the user decide if they want to pair.
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showalert = do
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let route = ConfirmXMPPPairR (PairKey theiruuid $ formatJID theirjid)
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url <- liftIO $ renderUrl urlrenderer route []
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close <- asIO1 removeAlert
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void $ addAlert $ pairRequestReceivedAlert (T.unpack $ buddyName theirjid)
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AlertButton
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{ buttonUrl = url
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, buttonLabel = T.pack "Respond"
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, buttonAction = Just close
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}
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pairMsgReceived _ PairAck theiruuid _selfjid theirjid =
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{- PairAck must come from one of the buddies we are pairing with;
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- don't pair with just anyone. -}
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whenM (isBuddyPairing theirjid) $ do
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changeBuddyPairing theirjid False
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selfuuid <- liftAnnex getUUID
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sendNetMessage $
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PairingNotification PairDone (formatJID theirjid) selfuuid
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finishXMPPPairing theirjid theiruuid
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pairMsgReceived _ PairDone _theiruuid _selfjid theirjid =
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changeBuddyPairing theirjid False
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isBuddyPairing :: JID -> Assistant Bool
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isBuddyPairing jid = maybe False buddyPairing <$>
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getBuddy (genBuddyKey jid) <<~ buddyList
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changeBuddyPairing :: JID -> Bool -> Assistant ()
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changeBuddyPairing jid ispairing =
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updateBuddyList (M.adjust set key) <<~ buddyList
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where
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key = genBuddyKey jid
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set b = b { buddyPairing = ispairing }
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