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|
{- git-annex transfers
-
- Copyright 2012-2016 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE CPP, FlexibleInstances, BangPatterns #-}
module Annex.Transfer (
module X,
upload,
download,
runTransfer,
alwaysRunTransfer,
noRetry,
forwardRetry,
pickRemote,
) where
import Annex.Common
import qualified Annex
import Logs.Transfer as X
import Types.Transfer as X
import Annex.Notification as X
import Annex.Perms
import Utility.Metered
import Annex.LockPool
import Types.Remote (Verification(..))
import qualified Types.Remote as Remote
import Types.Concurrency
import Control.Concurrent
import qualified Data.Set as S
class Observable a where
observeBool :: a -> Bool
observeFailure :: a
instance Observable Bool where
observeBool = id
observeFailure = False
instance Observable (Bool, Verification) where
observeBool = fst
observeFailure = (False, UnVerified)
instance Observable (Either e Bool) where
observeBool (Left _) = False
observeBool (Right b) = b
observeFailure = Right False
upload :: Observable v => UUID -> Key -> AssociatedFile -> RetryDecider -> (MeterUpdate -> Annex v) -> NotifyWitness -> Annex v
upload u key f d a _witness = guardHaveUUID u $
runTransfer (Transfer Upload u key) f d a
download :: Observable v => UUID -> Key -> AssociatedFile -> RetryDecider -> (MeterUpdate -> Annex v) -> NotifyWitness -> Annex v
download u key f d a _witness = guardHaveUUID u $
runTransfer (Transfer Download u key) f d a
guardHaveUUID :: Observable v => UUID -> Annex v -> Annex v
guardHaveUUID u a
| u == NoUUID = return observeFailure
| otherwise = a
{- Runs a transfer action. Creates and locks the lock file while the
- action is running, and stores info in the transfer information
- file.
-
- If the transfer action returns False, the transfer info is
- left in the failedTransferDir.
-
- If the transfer is already in progress, returns False.
-
- An upload can be run from a read-only filesystem, and in this case
- no transfer information or lock file is used.
-}
runTransfer :: Observable v => Transfer -> Maybe FilePath -> RetryDecider -> (MeterUpdate -> Annex v) -> Annex v
runTransfer = runTransfer' False
{- Like runTransfer, but ignores any existing transfer lock file for the
- transfer, allowing re-running a transfer that is already in progress.
-
- Note that this may result in confusing progress meter display in the
- webapp, if multiple processes are writing to the transfer info file. -}
alwaysRunTransfer :: Observable v => Transfer -> Maybe FilePath -> RetryDecider -> (MeterUpdate -> Annex v) -> Annex v
alwaysRunTransfer = runTransfer' True
runTransfer' :: Observable v => Bool -> Transfer -> Maybe FilePath -> RetryDecider -> (MeterUpdate -> Annex v) -> Annex v
runTransfer' ignorelock t file shouldretry transferaction = do
info <- liftIO $ startTransferInfo file
(meter, tfile, metervar) <- mkProgressUpdater t info
mode <- annexFileMode
(lck, inprogress) <- prep tfile mode info
if inprogress && not ignorelock
then do
showNote "transfer already in progress, or unable to take transfer lock"
return observeFailure
else do
v <- retry info metervar $ transferaction meter
liftIO $ cleanup tfile lck
if observeBool v
then removeFailedTransfer t
else recordFailedTransfer t info
return v
where
#ifndef mingw32_HOST_OS
prep tfile mode info = catchPermissionDenied (const prepfailed) $ do
let lck = transferLockFile tfile
createAnnexDirectory $ takeDirectory lck
r <- tryLockExclusive (Just mode) lck
case r of
Nothing -> return (Nothing, True)
Just lockhandle -> ifM (checkSaneLock lck lockhandle)
( do
void $ liftIO $ tryIO $
writeTransferInfoFile info tfile
return (Just lockhandle, False)
, return (Nothing, True)
)
#else
prep tfile _mode info = catchPermissionDenied (const prepfailed) $ do
let lck = transferLockFile tfile
createAnnexDirectory $ takeDirectory lck
v <- catchMaybeIO $ liftIO $ lockExclusive lck
case v of
Nothing -> return (Nothing, False)
Just Nothing -> return (Nothing, True)
Just (Just lockhandle) -> do
void $ liftIO $ tryIO $
writeTransferInfoFile info tfile
return (Just lockhandle, False)
#endif
prepfailed = return (Nothing, False)
cleanup _ Nothing = noop
cleanup tfile (Just lockhandle) = do
let lck = transferLockFile tfile
void $ tryIO $ removeFile tfile
#ifndef mingw32_HOST_OS
void $ tryIO $ removeFile lck
dropLock lockhandle
#else
{- Windows cannot delete the lockfile until the lock
- is closed. So it's possible to race with another
- process that takes the lock before it's removed,
- so ignore failure to remove.
-}
dropLock lockhandle
void $ tryIO $ removeFile lck
#endif
retry oldinfo metervar run = do
v <- tryNonAsync run
case v of
Right b -> return b
Left e -> do
warning (show e)
b <- getbytescomplete metervar
let newinfo = oldinfo { bytesComplete = Just b }
if shouldretry oldinfo newinfo
then retry newinfo metervar run
else return observeFailure
getbytescomplete metervar
| transferDirection t == Upload =
liftIO $ readMVar metervar
| otherwise = do
f <- fromRepo $ gitAnnexTmpObjectLocation (transferKey t)
liftIO $ catchDefaultIO 0 $ getFileSize f
type RetryDecider = TransferInfo -> TransferInfo -> Bool
noRetry :: RetryDecider
noRetry _ _ = False
{- Retries a transfer when it fails, as long as the failed transfer managed
- to send some data. -}
forwardRetry :: RetryDecider
forwardRetry old new = bytesComplete old < bytesComplete new
{- Picks a remote from the list and tries a transfer to it. If the transfer
- does not succeed, goes on to try other remotes from the list.
-
- The list should already be ordered by remote cost, and is normally
- tried in order. However, when concurrent jobs are running, they will
- be assigned different remotes of the same cost when possible. This can
- increase total transfer speed.
-}
pickRemote :: Observable v => [Remote] -> (Remote -> Annex v) -> Annex v
pickRemote l a = go l =<< Annex.getState Annex.concurrency
where
go [] _ = return observeFailure
go (r:[]) _ = a r
go rs (Concurrent n) | n > 1 = do
mv <- Annex.getState Annex.activeremotes
active <- liftIO $ takeMVar mv
let rs' = sortBy (inactiveFirst active) rs
goconcurrent mv active rs'
go (r:rs) _ = do
ok <- a r
if observeBool ok
then return ok
else go rs NonConcurrent
goconcurrent mv active [] = do
liftIO $ putMVar mv active
return observeFailure
goconcurrent mv active (r:rs) = do
let !active' = S.insert r active
liftIO $ putMVar mv active'
let getnewactive = do
active'' <- liftIO $ takeMVar mv
let !active''' = S.delete r active''
return active'''
let removeactive = liftIO . putMVar mv =<< getnewactive
ok <- a r `onException` removeactive
if observeBool ok
then do
removeactive
return ok
else do
active'' <- getnewactive
-- Re-sort the remaining rs
-- because other threads could have
-- been assigned them in the meantime.
let rs' = sortBy (inactiveFirst active'') rs
goconcurrent mv active'' rs'
inactiveFirst :: S.Set Remote -> Remote -> Remote -> Ordering
inactiveFirst active a b
| Remote.cost a == Remote.cost b =
if a `S.member` active then GT else LT
| otherwise = compare a b
|
