87 lines
2.9 KiB
Haskell
87 lines
2.9 KiB
Haskell
{- git-annex assistant git pushing threads
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-
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- Copyright 2012 Joey Hess <joey@kitenet.net>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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module Assistant.Threads.Pusher where
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import Common.Annex
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import Assistant.Commits
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import Assistant.Pushes
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import Assistant.ThreadedMonad
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import Assistant.Threads.Merger
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import qualified Command.Sync
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import Utility.ThreadScheduler
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import Utility.Parallel
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import Data.Time.Clock
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{- This thread retries pushes that failed before. -}
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pushRetryThread :: ThreadState -> FailedPushChan -> IO ()
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pushRetryThread st pushchan = runEvery (Seconds halfhour) $ do
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-- We already waited half an hour, now wait until there are failed
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-- pushes to retry.
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pushes <- getFailedPushes pushchan
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-- Check times, to avoid repushing a push that's too new.
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now <- getCurrentTime
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let (newpushes, oldpushes) = partition (toorecent now . failedTimeStamp) pushes
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unless (null newpushes) $
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refillFailedPushes pushchan newpushes
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unless (null oldpushes) $
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pushToRemotes now st pushchan $ map failedRemote oldpushes
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where
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halfhour = 1800
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toorecent now time = now `diffUTCTime` time < fromIntegral halfhour
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{- This thread pushes git commits out to remotes soon after they are made. -}
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pushThread :: ThreadState -> CommitChan -> FailedPushChan -> IO ()
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pushThread st commitchan pushchan = do
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remotes <- runThreadState st $ Command.Sync.syncRemotes []
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runEvery (Seconds 2) $ do
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-- We already waited two seconds as a simple rate limiter.
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-- Next, wait until at least one commit has been made
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commits <- getCommits commitchan
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-- Now see if now's a good time to push.
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now <- getCurrentTime
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if shouldPush now commits
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then pushToRemotes now st pushchan remotes
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else refillCommits commitchan commits
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{- Decide if now is a good time to push to remotes.
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-
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- Current strategy: Immediately push all commits. The commit machinery
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- already determines batches of changes, so we can't easily determine
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- batches better.
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-}
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shouldPush :: UTCTime -> [Commit] -> Bool
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shouldPush _now commits
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| not (null commits) = True
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| otherwise = False
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{- Updates the local sync branch, then pushes it to all remotes, in
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- parallel.
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-
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- Avoids running possibly long-duration commands in the Annex monad, so
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- as not to block other threads. -}
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pushToRemotes :: UTCTime -> ThreadState -> FailedPushChan -> [Remote] -> IO ()
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pushToRemotes now st pushchan remotes = do
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(g, branch) <- runThreadState st $
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(,) <$> fromRepo id <*> Command.Sync.currentBranch
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go True branch g remotes
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where
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go shouldretry branch g rs = do
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Command.Sync.updateBranch (Command.Sync.syncBranch branch) g
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failed <- inParallel (push g branch) rs
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unless (null failed) $
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if shouldretry
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then retry branch g rs
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else refillFailedPushes pushchan $
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map (`FailedPush` now) failed
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push g branch remote =
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ifM (Command.Sync.pushBranch remote branch g)
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( exitSuccess, exitFailure)
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retry branch g rs = do
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runThreadState st $ manualPull branch rs
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go False branch g rs
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