add a push retry thread

Assistant/Pushes.hs

@@ -0,0 +1,36 @@
+{- git-annex assistant push tracking
+ -
+ - Copyright 2012 Joey Hess <joey@kitenet.net>
+ -
+ - Licensed under the GNU GPL version 3 or higher.
+ -}
+
+module Assistant.Pushes where
+
+import Common.Annex
+import Utility.TSet
+
+import Data.Time.Clock
+
+type FailedPushChan = TSet FailedPush
+
+data FailedPush = FailedPush
+        { failedRemote :: Remote
+        , failedTimeStamp :: UTCTime
+        }
+
+newFailedPushChan :: IO FailedPushChan
+newFailedPushChan = newTSet
+
+{- Gets all failed pushes. Blocks until there is at least one failed push. -}
+getFailedPushes :: FailedPushChan -> IO [FailedPush]
+getFailedPushes = getTSet
+
+{- Puts failed pushes back into the channel.
+ - Note: Original order is not preserved. -}
+refillFailedPushes :: FailedPushChan -> [FailedPush] -> IO ()
+refillFailedPushes = putTSet
+
+{- Records a failed push in the channel. -}
+recordFailedPush :: FailedPushChan -> FailedPush -> IO ()
+recordFailedPush = putTSet1