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{- git-annex assistant git syncing thread
-
- Copyright 2012 Joey Hess <joey@kitenet.net>
-}
module Assistant.Syncer where
import Common.Annex
import Assistant.Commits
import Assistant.ThreadedMonad
import qualified Command.Sync
import Utility.ThreadScheduler
import Utility.Parallel
import Data.Time.Clock
data FailedSync = FailedSync
{ failedRemote :: Remote
, failedTimeStamp :: UTCTime
}
{- This thread syncs git commits out to remotes. -}
syncThread :: ThreadState -> CommitChan -> IO ()
syncThread st commitchan = do
remotes <- runThreadState st $ Command.Sync.syncRemotes []
runEveryWith (Seconds 2) [] $ \failedsyncs -> do
-- We already waited two seconds as a simple rate limiter.
-- Next, wait until at least one commit has been made
commits <- getCommits commitchan
-- Now see if now's a good time to sync.
time <- getCurrentTime
if shouldSync time commits failedsyncs
then syncToRemotes time st remotes
else do
refillCommits commitchan commits
return failedsyncs
{- Decide if now is a good time to sync to remotes.
-
- Current strategy: Immediately sync all commits. The commit machinery
- already determines batches of changes, so we can't easily determine
- batches better.
-
- TODO: FailedSyncs are only retried the next time there's a commit.
- Should retry them periodically, or when a remote that was not available
- becomes available.
-}
shouldSync :: UTCTime -> [Commit] -> [FailedSync] -> Bool
shouldSync _now commits _failedremotes
| not (null commits) = True
| otherwise = False
{- Updates the local sync branch, then pushes it to all remotes, in
- parallel.
-
- Avoids running possibly long-duration commands in the Annex monad, so
- as not to block other threads. -}
syncToRemotes :: UTCTime -> ThreadState -> [Remote] -> IO [FailedSync]
syncToRemotes now st remotes = do
(g, branch) <- runThreadState st $
(,) <$> fromRepo id <*> Command.Sync.currentBranch
Command.Sync.updateBranch (Command.Sync.syncBranch branch) g
map (`FailedSync` now) <$> inParallel (go g branch) remotes
where
go g branch remote =
ifM (Command.Sync.pushBranch remote branch g)
( exitSuccess, exitFailure)
|
