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|
{- git-annex XMPP client
-
- Copyright 2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Assistant.Threads.XMPPClient where
import Assistant.Common
import Assistant.XMPP
import Assistant.XMPP.Client
import Assistant.NetMessager
import Assistant.Types.NetMessager
import Assistant.Types.Buddies
import Assistant.XMPP.Buddies
import Assistant.Sync
import Assistant.DaemonStatus
import qualified Remote
import Utility.ThreadScheduler
import Network.Protocol.XMPP
import Control.Concurrent
import qualified Data.Set as S
import qualified Git.Branch
import Data.Time.Clock
xmppClientThread :: NamedThread
xmppClientThread = NamedThread "XMPPClient" $ do
iodebug <- asIO1 debug
iopull <- asIO1 pull
ioupdatebuddies <- asIO1 $ \p ->
updateBuddyList (updateBuddies p) <<~ buddyList
ioemptybuddies <- asIO $
updateBuddyList (const noBuddies) <<~ buddyList
iorelay <- asIO relayNetMessage
ioclientthread <- asIO $
go iorelay iodebug iopull ioupdatebuddies ioemptybuddies
restartableClient ioclientthread
where
go iorelay iodebug iopull ioupdatebuddies ioemptybuddies = do
v <- liftAnnex getXMPPCreds
case v of
Nothing -> noop
Just c -> liftIO $ loop c =<< getCurrentTime
where
debug' = void . liftIO . iodebug
{- When the client exits, it's restarted;
- if it keeps failing, back off to wait 5 minutes before
- trying it again. -}
loop c starttime = do
runclient c
now <- getCurrentTime
if diffUTCTime now starttime > 300
then do
void $ iodebug ["connection lost; reconnecting"]
loop c now
else do
void $ iodebug ["connection failed; will retry"]
threadDelaySeconds (Seconds 300)
loop c =<< getCurrentTime
runclient c = void $ connectXMPP c $ \jid -> do
fulljid <- bindJID jid
debug' ["connected", show fulljid]
{- The buddy list starts empty each time
- the client connects, so that stale info
- is not retained. -}
void $ liftIO ioemptybuddies
putStanza $ gitAnnexPresence gitAnnexSignature
xmppThread $ receivenotifications fulljid
forever $ do
a <- liftIO iorelay
a
receivenotifications fulljid = forever $ do
s <- getStanza
let v = decodeStanza fulljid s
debug' ["received:", show v]
case v of
PresenceMessage p -> void $ liftIO $ ioupdatebuddies p
PresenceQuery p -> do
void $ liftIO $ ioupdatebuddies p
putStanza $ gitAnnexPresence gitAnnexSignature
PushNotification us -> void $ liftIO $ iopull us
Ignorable _ -> noop
Unknown _ -> noop
{- Waits for a NetMessager message to be sent, and relays it to XMPP. -}
relayNetMessage :: Assistant (XMPP ())
relayNetMessage = convert <$> waitNetMessage
where
convert (NotifyPush us) =
putStanza $ gitAnnexPresence $ encodePushNotification us
data DecodedStanza
= PresenceMessage Presence
| PresenceQuery Presence
| PushNotification [UUID]
| Ignorable Presence
| Unknown ReceivedStanza
deriving Show
decodeStanza :: JID -> ReceivedStanza -> DecodedStanza
decodeStanza fulljid (ReceivedPresence p)
| presenceFrom p == Nothing = Ignorable p
| presenceFrom p == Just fulljid = Ignorable p
| isPresenceQuery p = PresenceQuery p
| null pushed = Ignorable p
| otherwise = PushNotification pushed
where
pushed = concat $ catMaybes $ map decodePushNotification $
presencePayloads p
decodeStanza _ s = Unknown s
{- Runs the client, handing restart events. -}
restartableClient :: IO () -> Assistant ()
restartableClient a = forever $ do
tid <- liftIO $ forkIO a
waitNetMessagerRestart
liftIO $ killThread tid
{- Runs a XMPP action in a separate thread, using a session to allow it
- to access the same XMPP client. -}
xmppThread :: XMPP () -> XMPP ()
xmppThread a = do
s <- getSession
void $ liftIO $ forkIO $
void $ runXMPP s a
{- We only pull from one remote out of the set listed in the push
- notification, as an optimisation.
-
- Note that it might be possible (though very unlikely) for the push
- notification to take a while to be sent, and multiple pushes happen
- before it is sent, so it includes multiple remotes that were pushed
- to at different times.
-
- It could then be the case that the remote we choose had the earlier
- push sent to it, but then failed to get the later push, and so is not
- fully up-to-date. If that happens, the pushRetryThread will come along
- and retry the push, and we'll get another notification once it succeeds,
- and pull again. -}
pull :: [UUID] -> Assistant ()
pull [] = noop
pull us = do
rs <- filter matching . syncRemotes <$> getDaemonStatus
debug $ "push notification for" : map (fromUUID . Remote.uuid ) rs
pullone rs =<< liftAnnex (inRepo Git.Branch.current)
where
matching r = Remote.uuid r `S.member` s
s = S.fromList us
pullone [] _ = noop
pullone (r:rs) branch =
unlessM (all id . fst <$> manualPull branch [r]) $
pullone rs branch
|
