xmpp reconnection

If it managed to run for 5 minutes, reconnect immediately. Otherwise,
wait 5 minutes before reconnecting.

Assistant/Threads/PushNotifier.hs

@@ -17,11 +17,13 @@ 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
 
 thisThread :: ThreadName
 thisThread = "PushNotifier"
@@ -31,14 +33,27 @@ pushNotifierThread st dstatus pushnotifier = NamedThread thisThread $ do
 	v <- runThreadState st $ getXMPPCreds
 	case v of
 		Nothing -> return () -- no creds? exit thread
-		Just c -> void $ connectXMPP c $ \jid -> do
+		Just c -> loop c =<< getCurrentTime
+	where
+		loop c starttime = do
+			void $ connectXMPP c $ \jid -> do
 				fulljid <- bindJID jid
 				liftIO $ debug thisThread ["XMPP connected", show fulljid]
 				s <- getSession
 				_ <- liftIO $ forkIO $ void $ runXMPP s $
 					receivenotifications
 				sendnotifications
-	where
+			now <- getCurrentTime
+			if diffUTCTime now starttime > 300
+				then do
+					debug thisThread ["XMPP connection lost; reconnecting"]
+					loop c now
+				else do
+					debug thisThread ["XMPP connection failed; will retry"]
+					threadDelaySeconds (Seconds 300)
+					loop c =<< getCurrentTime
+
+		
 		sendnotifications = forever $ do
 			us <- liftIO $ waitPush pushnotifier
 			let payload = [extendedAway, encodePushNotification us]

doc/design/assistant/xmpp.mdwn

@@ -4,20 +4,20 @@ who share a repository, that is stored in the [[cloud]].
 
 ### TODO
 
-* Track down segfault when the XMPP library is starting up a client connection.
-* test with big servers, eg google chat
 * Prevent idle disconnection. Probably means sending or receiving pings,
   but would prefer to avoid eg pinging every 60 seconds as some clients do.
+* Make the NetWatcher restart the XMPP connection when there's a new default
+  route. Currently, if moving networks, it needs to go through a TCP timeout.
 * Make the git-annex clients invisible, so a user can use their regular
   account without always seeming to be present when git-annex is logged in.
   See <http://xmpp.org/extensions/xep-0126.html>
-* webapp configuration
+* (re)start PushNotifier when webapp is used to change XMPP config.
 * After pulling from a remote, may need to scan for transfers, which
   could involve other remotes (ie, S3). Since the remote client is not able to
   talk to us directly, it won't be able to upload any new files to us.
   Need a fast way to find new files, and get them transferring. The expensive
   transfer scan may be needed to get fully in sync, but is too expensive to
-  run every time this happens.
+  run every time this happens. Send transfer notifications using XMPP?
 
 ## design goals