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{- git-annex assistant push notification thread, using XMPP
-
- This handles both sending outgoing push notifications, and receiving
- incoming push notifications.
-
- Copyright 2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Assistant.Threads.PushNotifier where
import Assistant.Common
import Assistant.XMPP
import Assistant.DaemonStatus
import Assistant.Pushes
import Assistant.Sync
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
pushNotifierThread :: NamedThread
pushNotifierThread = NamedThread "PushNotifier" $ do
iodebug <- asIO debug
iopull <- asIO pull
pn <- getAssistant pushNotifier
controllerThread pn <~> xmppClient pn iodebug iopull
controllerThread :: PushNotifier -> IO () -> IO ()
controllerThread pushnotifier xmppclient = forever $ do
tid <- forkIO xmppclient
waitRestart pushnotifier
killThread tid
xmppClient :: PushNotifier -> ([String] -> IO ()) -> ([UUID] -> IO ()) -> Assistant ()
xmppClient pushnotifier iodebug iopull = do
v <- liftAnnex getXMPPCreds
case v of
Nothing -> noop
Just c -> liftIO $ loop c =<< getCurrentTime
where
loop c starttime = do
void $ connectXMPP c $ \jid -> do
fulljid <- bindJID jid
liftIO $ iodebug ["XMPP connected", show fulljid]
putStanza $ gitAnnexPresence gitAnnexSignature
s <- getSession
_ <- liftIO $ forkIO $ void $ runXMPP s $
receivenotifications
sendnotifications
now <- getCurrentTime
if diffUTCTime now starttime > 300
then do
iodebug ["XMPP connection lost; reconnecting"]
loop c now
else do
iodebug ["XMPP connection failed; will retry"]
threadDelaySeconds (Seconds 300)
loop c =<< getCurrentTime
sendnotifications = forever $ do
us <- liftIO $ waitPush pushnotifier
putStanza $ gitAnnexPresence $ encodePushNotification us
receivenotifications = forever $ do
s <- getStanza
liftIO $ iodebug ["received XMPP:", show s]
case s of
ReceivedPresence p@(Presence { presenceType = PresenceAvailable }) ->
liftIO $ iopull $ concat $ catMaybes $
map decodePushNotification $
presencePayloads p
_ -> noop
{- 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 <$> daemonStatus
debug $ "push notification for" : map (fromUUID . Remote.uuid ) rs
st <- getAssistant threadState
liftIO . pullone st rs =<< liftAnnex (inRepo Git.Branch.current)
where
matching r = Remote.uuid r `S.member` s
s = S.fromList us
pullone _ [] _ = noop
pullone st (r:rs) branch =
unlessM (all id . fst <$> manualPull st branch [r]) $
pullone st rs branch
|
