69 lines
2.2 KiB
Haskell
69 lines
2.2 KiB
Haskell
{- git-annex assistant git pushing thread
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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.Pusher where
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import Common.Annex
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import Assistant.Commits
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import Assistant.ThreadedMonad
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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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data FailedPush = FailedPush
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{ failedRemote :: Remote
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, failedTimeStamp :: UTCTime
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}
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{- This thread pushes git commits out to remotes. -}
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pushThread :: ThreadState -> CommitChan -> IO ()
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pushThread st commitchan = do
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remotes <- runThreadState st $ Command.Sync.syncRemotes []
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runEveryWith (Seconds 2) [] $ \failedpushes -> 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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time <- getCurrentTime
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if shouldPush time commits failedpushes
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then pushToRemotes time st remotes
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else do
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refillCommits commitchan commits
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return failedpushes
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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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- TODO: FailedPushs are only retried the next time there's a commit.
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- Should retry them periodically, or when a remote that was not available
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- becomes available.
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-}
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shouldPush :: UTCTime -> [Commit] -> [FailedPush] -> Bool
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shouldPush _now commits _failedremotes
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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 -> [Remote] -> IO [FailedPush]
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pushToRemotes now st remotes = do
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(g, branch) <- runThreadState st $
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(,) <$> fromRepo id <*> Command.Sync.currentBranch
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Command.Sync.updateBranch (Command.Sync.syncBranch branch) g
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map (`FailedPush` now) <$> inParallel (push g branch) remotes
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where
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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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