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|
{- git-annex transfer information files and lock files
-
- Copyright 2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Logs.Transfer where
import Common.Annex
import Annex.Perms
import Annex.Exception
import qualified Git
import Types.Remote
import qualified Fields
import System.Posix.Types
import Data.Time.Clock
import Data.Time.Clock.POSIX
import Data.Time
import System.Locale
import Control.Concurrent
{- Enough information to uniquely identify a transfer, used as the filename
- of the transfer information file. -}
data Transfer = Transfer
{ transferDirection :: Direction
, transferUUID :: UUID
, transferKey :: Key
}
deriving (Show, Eq, Ord)
{- Information about a Transfer, stored in the transfer information file.
-
- Note that the associatedFile may not correspond to a file in the local
- git repository. It's some file, possibly relative to some directory,
- of some repository, that was acted on to initiate the transfer.
-}
data TransferInfo = TransferInfo
{ startedTime :: Maybe POSIXTime
, transferPid :: Maybe ProcessID
, transferTid :: Maybe ThreadId
, transferRemote :: Maybe Remote
, bytesComplete :: Maybe Integer
, associatedFile :: Maybe FilePath
}
deriving (Show, Eq, Ord)
data Direction = Upload | Download
deriving (Eq, Ord)
instance Show Direction where
show Upload = "upload"
show Download = "download"
readDirection :: String -> Maybe Direction
readDirection "upload" = Just Upload
readDirection "download" = Just Download
readDirection _ = Nothing
upload :: UUID -> Key -> AssociatedFile -> Annex a -> Annex a
upload u key file a = transfer (Transfer Upload u key) file a
download :: UUID -> Key -> AssociatedFile -> Annex a -> Annex a
download u key file a = transfer (Transfer Download u key) file a
fieldTransfer :: Direction -> Key -> Annex a -> Annex a
fieldTransfer direction key a = do
afile <- Fields.getField Fields.associatedFile
maybe a (\u -> transfer (Transfer direction (toUUID u) key) afile a)
=<< Fields.getField Fields.remoteUUID
{- Runs a transfer action. Creates and locks the lock file while the
- action is running, and stores info in the transfer information
- file. Will throw an error if the transfer is already in progress.
-}
transfer :: Transfer -> Maybe FilePath -> Annex a -> Annex a
transfer t file a = do
tfile <- fromRepo $ transferFile t
createAnnexDirectory $ takeDirectory tfile
mode <- annexFileMode
info <- liftIO $ TransferInfo
<$> (Just . utcTimeToPOSIXSeconds <$> getCurrentTime)
<*> pure Nothing -- pid not stored in file, so omitted for speed
<*> pure Nothing -- tid ditto
<*> pure Nothing -- not 0; transfer may be resuming
<*> pure Nothing
<*> pure file
bracketIO (prep tfile mode info) (cleanup tfile) a
where
prep tfile mode info = do
fd <- openFd (transferLockFile tfile) ReadWrite (Just mode)
defaultFileFlags { trunc = True }
locked <- catchMaybeIO $
setLock fd (WriteLock, AbsoluteSeek, 0, 0)
when (locked == Nothing) $
error $ "transfer already in progress"
writeFile tfile $ writeTransferInfo info
return fd
cleanup tfile fd = do
removeFile tfile
removeFile $ transferLockFile tfile
closeFd fd
{- If a transfer is still running, returns its TransferInfo. -}
checkTransfer :: Transfer -> Annex (Maybe TransferInfo)
checkTransfer t = do
mode <- annexFileMode
tfile <- fromRepo $ transferFile t
mfd <- liftIO $ catchMaybeIO $
openFd (transferLockFile tfile) ReadOnly (Just mode) defaultFileFlags
case mfd of
Nothing -> return Nothing -- failed to open file; not running
Just fd -> do
locked <- liftIO $
getLock fd (WriteLock, AbsoluteSeek, 0, 0)
liftIO $ closeFd fd
case locked of
Nothing -> return Nothing
Just (pid, _) -> liftIO $
flip catchDefaultIO Nothing $ do
readTransferInfo pid
<$> readFile tfile
{- Gets all currently running transfers. -}
getTransfers :: Annex [(Transfer, TransferInfo)]
getTransfers = do
transfers <- catMaybes . map parseTransferFile <$> findfiles
infos <- mapM checkTransfer transfers
return $ map (\(t, Just i) -> (t, i)) $
filter running $ zip transfers infos
where
findfiles = liftIO . dirContentsRecursive
=<< fromRepo gitAnnexTransferDir
running (_, i) = isJust i
{- The transfer information file to use for a given Transfer. -}
transferFile :: Transfer -> Git.Repo -> FilePath
transferFile (Transfer direction u key) r = gitAnnexTransferDir r
</> show direction
</> fromUUID u
</> keyFile key
{- The transfer lock file corresponding to a given transfer info file. -}
transferLockFile :: FilePath -> FilePath
transferLockFile infofile = let (d,f) = splitFileName infofile in
combine d ("lck." ++ f)
{- Parses a transfer information filename to a Transfer. -}
parseTransferFile :: FilePath -> Maybe Transfer
parseTransferFile file
| "lck." `isPrefixOf` (takeFileName file) = Nothing
| otherwise = case drop (length bits - 3) bits of
[direction, u, key] -> Transfer
<$> readDirection direction
<*> pure (toUUID u)
<*> fileKey key
_ -> Nothing
where
bits = splitDirectories file
writeTransferInfo :: TransferInfo -> String
writeTransferInfo info = unlines
-- transferPid is not included; instead obtained by looking at
-- the process that locks the file.
[ maybe "" show $ startedTime info
-- bytesComplete is not included; changes too fast
, fromMaybe "" $ associatedFile info -- comes last; arbitrary content
]
readTransferInfo :: ProcessID -> String -> Maybe TransferInfo
readTransferInfo pid s =
case bits of
[time] -> TransferInfo
<$> (Just <$> parsePOSIXTime time)
<*> pure (Just pid)
<*> pure Nothing
<*> pure Nothing
<*> pure Nothing
<*> pure (if null filename then Nothing else Just filename)
_ -> Nothing
where
(bits, filebits) = splitAt 1 $ lines s
filename = join "\n" filebits
parsePOSIXTime :: String -> Maybe POSIXTime
parsePOSIXTime s = utcTimeToPOSIXSeconds
<$> parseTime defaultTimeLocale "%s%Qs" s
|
