131 lines
3.9 KiB
Haskell
131 lines
3.9 KiB
Haskell
{- git-annex transfers
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-
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- Copyright 2012-2014 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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{-# LANGUAGE CPP #-}
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module Annex.Transfer (
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module X,
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upload,
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download,
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runTransfer,
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noRetry,
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forwardRetry,
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) where
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import Common.Annex
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import Logs.Transfer as X
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import Annex.Notification as X
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import Annex.Perms
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import Annex.Exception
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import Utility.Metered
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#ifdef mingw32_HOST_OS
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import Utility.WinLock
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#endif
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import Control.Concurrent
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upload :: UUID -> Key -> AssociatedFile -> RetryDecider -> (MeterUpdate -> Annex Bool) -> NotifyWitness -> Annex Bool
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upload u key f d a _witness = runTransfer (Transfer Upload u key) f d a
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download :: UUID -> Key -> AssociatedFile -> RetryDecider -> (MeterUpdate -> Annex Bool) -> NotifyWitness -> Annex Bool
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download u key f d a _witness = runTransfer (Transfer Download u key) f d a
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{- Runs a transfer action. Creates and locks the lock file while the
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- action is running, and stores info in the transfer information
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- file.
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-
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- If the transfer action returns False, the transfer info is
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- left in the failedTransferDir.
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-
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- If the transfer is already in progress, returns False.
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-
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- An upload can be run from a read-only filesystem, and in this case
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- no transfer information or lock file is used.
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-}
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runTransfer :: Transfer -> Maybe FilePath -> RetryDecider -> (MeterUpdate -> Annex Bool) -> Annex Bool
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runTransfer t file shouldretry a = do
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info <- liftIO $ startTransferInfo file
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(meter, tfile, metervar) <- mkProgressUpdater t info
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mode <- annexFileMode
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(fd, inprogress) <- liftIO $ prep tfile mode info
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if inprogress
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then do
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showNote "transfer already in progress"
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return False
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else do
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ok <- retry info metervar $
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bracketIO (return fd) (cleanup tfile) (const $ a meter)
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unless ok $ recordFailedTransfer t info
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return ok
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where
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#ifndef mingw32_HOST_OS
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prep tfile mode info = do
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mfd <- catchMaybeIO $
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openFd (transferLockFile tfile) ReadWrite (Just mode)
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defaultFileFlags { trunc = True }
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case mfd of
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Nothing -> return (Nothing, False)
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Just fd -> do
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locked <- catchMaybeIO $
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setLock fd (WriteLock, AbsoluteSeek, 0, 0)
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if isNothing locked
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then return (Nothing, True)
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else do
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void $ tryIO $ writeTransferInfoFile info tfile
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return (mfd, False)
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#else
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prep tfile _mode info = do
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v <- catchMaybeIO $ lockExclusive (transferLockFile tfile)
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case v of
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Nothing -> return (Nothing, False)
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Just Nothing -> return (Nothing, True)
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Just (Just lockhandle) -> do
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void $ tryIO $ writeTransferInfoFile info tfile
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return (Just lockhandle, False)
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#endif
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cleanup _ Nothing = noop
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cleanup tfile (Just lockhandle) = do
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void $ tryIO $ removeFile tfile
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#ifndef mingw32_HOST_OS
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void $ tryIO $ removeFile $ transferLockFile tfile
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closeFd lockhandle
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#else
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{- Windows cannot delete the lockfile until the lock
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- is closed. So it's possible to race with another
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- process that takes the lock before it's removed,
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- so ignore failure to remove.
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-}
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dropLock lockhandle
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void $ tryIO $ removeFile $ transferLockFile tfile
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#endif
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retry oldinfo metervar run = do
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v <- tryAnnex run
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case v of
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Right b -> return b
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Left _ -> do
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b <- getbytescomplete metervar
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let newinfo = oldinfo { bytesComplete = Just b }
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if shouldretry oldinfo newinfo
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then retry newinfo metervar run
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else return False
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getbytescomplete metervar
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| transferDirection t == Upload =
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liftIO $ readMVar metervar
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| otherwise = do
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f <- fromRepo $ gitAnnexTmpObjectLocation (transferKey t)
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liftIO $ catchDefaultIO 0 $
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fromIntegral . fileSize <$> getFileStatus f
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type RetryDecider = TransferInfo -> TransferInfo -> Bool
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noRetry :: RetryDecider
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noRetry _ _ = False
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{- Retries a transfer when it fails, as long as the failed transfer managed
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- to send some data. -}
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forwardRetry :: RetryDecider
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forwardRetry old new = bytesComplete old < bytesComplete new
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