375 lines
13 KiB
Haskell
375 lines
13 KiB
Haskell
{- git-annex XMPP client
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-
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- Copyright 2012, 2013 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)
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import Assistant.WebApp.Types hiding (liftAssistant)
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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 Logs.UUID
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import Network.Protocol.XMPP
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import Control.Concurrent
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import Control.Concurrent.STM.TMVar
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import Control.Concurrent.STM (atomically)
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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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import Control.Concurrent.Async
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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 -> UUID -> 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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xmppuuid <- maybe NoUUID Remote.uuid . headMaybe
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. filter Remote.isXMPPRemote . syncRemotes
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<$> getDaemonStatus
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tid <- liftIO $ forkIO $ a creds xmppuuid
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waitNetMessagerRestart
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liftIO $ killThread tid
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xmppClient :: UrlRenderer -> AssistantData -> XMPPCreds -> UUID -> IO ()
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xmppClient urlrenderer d creds xmppuuid =
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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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void client
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liftAssistant $ do
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modifyDaemonStatus_ $ \s -> s
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{ xmppClientID = Nothing }
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changeCurrentlyConnected $ S.delete xmppuuid
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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"]
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retry client now
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else do
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liftAssistant $ debug ["connection failed; will retry"]
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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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changeCurrentlyConnected $ S.insert xmppuuid
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debug ["connected", logJid selfjid]
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lasttraffic <- liftIO $ atomically . newTMVar =<< getCurrentTime
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sender <- xmppSession $ sendnotifications selfjid
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receiver <- xmppSession $ receivenotifications selfjid lasttraffic
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pinger <- xmppSession $ sendpings selfjid lasttraffic
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{- Run all 3 threads concurrently, until
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- any of them throw an exception.
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- Then kill all 3 threads, and rethrow the
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- exception.
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-
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- If this thread gets an exception, the 3 threads
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- will also be killed. -}
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liftIO $ pinger `concurrently` sender `concurrently` receiver
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sendnotifications selfjid = forever $
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join $ inAssistant $ relayNetMessage selfjid
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receivenotifications selfjid lasttraffic = forever $ do
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l <- decodeStanza selfjid <$> getStanza
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void $ liftIO $ atomically . swapTMVar lasttraffic =<< getCurrentTime
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inAssistant $ debug
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["received:", show $ map logXMPPEvent l]
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mapM_ (handle selfjid) l
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sendpings selfjid lasttraffic = forever $ do
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putStanza pingstanza
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startping <- liftIO getCurrentTime
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liftIO $ threadDelaySeconds (Seconds 120)
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t <- liftIO $ atomically $ readTMVar lasttraffic
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when (t < startping) $ do
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inAssistant $ debug ["ping timeout"]
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error "ping timeout"
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where
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{- XEP-0199 says that the server will respond with either
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- a ping response or an error message. Either will
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- cause traffic, so good enough. -}
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pingstanza = xmppPing selfjid
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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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| isPushNotice pushstage = inAssistant $ handlePushNotice m
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| isPushInitiation pushstage = inAssistant $ queuePushInitiation m
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| otherwise = inAssistant $ storeInbox 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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let msg' = readdressNetMessage msg c
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inAssistant $ debug
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[ "sending to new client:"
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, logJid jid
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, show $ logNetMessage msg'
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]
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join $ inAssistant $ convertNetMsg msg' selfjid
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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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logXMPPEvent :: XMPPEvent -> String
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logXMPPEvent (GotNetMessage m) = logNetMessage m
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logXMPPEvent (PresenceMessage p) = logPresence p
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logXMPPEvent (Ignorable (ReceivedPresence p)) = "Ignorable " ++ logPresence p
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logXMPPEvent (Ignorable _) = "Ignorable message"
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logXMPPEvent (Unknown _) = "Unknown message"
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logXMPPEvent (ProtocolError _) = "Protocol error message"
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logPresence :: Presence -> String
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logPresence (p@Presence { presenceFrom = Just jid }) = unwords
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[ "Presence from"
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, logJid jid
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, show $ extractGitAnnexTag p
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]
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logPresence _ = "Presence from unknown"
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logJid :: JID -> String
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logJid jid =
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let name = T.unpack (buddyName jid)
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resource = maybe "" (T.unpack . strResource) (jidResource jid)
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in take 1 name ++ show (length name) ++ "/" ++ resource
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logClient :: Client -> String
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logClient (Client jid) = logJid jid
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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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| isNothing (presenceFrom p) = [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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| isNothing (messageFrom m) = [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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debug ["sending:", logNetMessage msg]
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a1 <- handleImportant msg
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a2 <- convert msg
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return (a1 >> a2)
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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 -> do
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storeImportantNetMessage msg (formatJID tojid) $
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\c -> (baseJID <$> parseJID c) == Just tojid
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return $ putStanza presenceQuery
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_ -> return noop
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convert (Pushing c pushstage) = withOtherClient selfjid c $ \tojid ->
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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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debug ["exploded undirected message to clients", unwords $ map logClient clients]
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return $ forM_ clients $ \(Client jid) ->
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putStanza $ pushMessage pushstage jid selfjid
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else do
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debug ["to client:", logJid tojid]
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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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{- Returns an IO action that runs a XMPP action in a separate thread,
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- using a session to allow it to access the same XMPP client. -}
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xmppSession :: XMPP () -> XMPP (IO ())
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xmppSession a = do
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s <- getSession
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return $ 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 (null . fst <$> manualPull branch [r]) $
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pullone rs branch
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{- PairReq from another client using our JID is automatically
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- accepted. This is so pairing devices all using the same XMPP
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- account works without confirmations.
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-
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- Also, autoaccept PairReq from the same JID of any repo we've
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- already paired with, as long as the UUID in the PairReq is
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- one we know about.
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-}
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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 <- mapMaybe (parseJID . getXMPPClientID)
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. filter Remote.isXMPPRemote . syncRemotes <$> getDaemonStatus
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um <- liftAnnex uuidMap
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if elem (baseJID theirjid) knownjids && M.member theiruuid um
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then autoaccept
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else showalert
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where
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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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button <- mkAlertButton True (T.pack "Respond") urlrenderer $
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ConfirmXMPPPairFriendR $
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PairKey theiruuid $ formatJID theirjid
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void $ addAlert $ pairRequestReceivedAlert
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(T.unpack $ buddyName theirjid)
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button
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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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pairMsgReceived _ PairAck theiruuid _selfjid theirjid =
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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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