e426fac273
Motivation: Hook scripts for nautilus or other file managers need to provide the user with feedback that a file is being downloaded. This commit was sponsored by THM Schoemaker.
140 lines
3.7 KiB
Haskell
140 lines
3.7 KiB
Haskell
{- git-annex command, used internally by assistant
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-
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- Copyright 2012, 2013 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 TypeSynonymInstances, FlexibleInstances #-}
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module Command.TransferKeys where
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import Common.Annex
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import Command
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import Annex.Content
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import Logs.Location
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import Annex.Transfer
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import qualified Remote
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import Types.Key
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import GHC.IO.Handle
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data TransferRequest = TransferRequest Direction Remote Key AssociatedFile
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def :: [Command]
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def = [command "transferkeys" paramNothing seek
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SectionPlumbing "transfers keys"]
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seek :: CommandSeek
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seek = withNothing start
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start :: CommandStart
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start = withHandles $ \(readh, writeh) -> do
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runRequests readh writeh runner
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stop
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where
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runner (TransferRequest direction remote key file)
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| direction == Upload = notifyTransfer direction file $
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upload (Remote.uuid remote) key file forwardRetry $ \p -> do
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ok <- Remote.storeKey remote key file p
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when ok $
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Remote.logStatus remote key InfoPresent
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return ok
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| otherwise = notifyTransfer direction file $
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download (Remote.uuid remote) key file forwardRetry $ \p ->
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getViaTmp key $ \t -> Remote.retrieveKeyFile remote key file t p
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{- stdin and stdout are connected with the caller, to be used for
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- communication with it. But doing a transfer might involve something
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- that tries to read from stdin, or write to stdout. To avoid that, close
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- stdin, and duplicate stderr to stdout. Return two new handles
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- that are duplicates of the original (stdin, stdout). -}
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withHandles :: ((Handle, Handle) -> Annex a) -> Annex a
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withHandles a = do
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readh <- liftIO $ hDuplicate stdin
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writeh <- liftIO $ hDuplicate stdout
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liftIO $ do
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nullh <- openFile devNull ReadMode
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nullh `hDuplicateTo` stdin
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stderr `hDuplicateTo` stdout
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a (readh, writeh)
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runRequests
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:: Handle
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-> Handle
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-> (TransferRequest -> Annex Bool)
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-> Annex ()
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runRequests readh writeh a = do
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liftIO $ do
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hSetBuffering readh NoBuffering
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fileEncoding readh
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fileEncoding writeh
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go =<< readrequests
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where
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go (d:u:k:f:rest) = do
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case (deserialize d, deserialize u, deserialize k, deserialize f) of
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(Just direction, Just uuid, Just key, Just file) -> do
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mremote <- Remote.remoteFromUUID uuid
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case mremote of
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Nothing -> sendresult False
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Just remote -> sendresult =<< a
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(TransferRequest direction remote key file)
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_ -> sendresult False
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go rest
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go [] = noop
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go [""] = noop
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go v = error $ "transferkeys protocol error: " ++ show v
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readrequests = liftIO $ split fieldSep <$> hGetContents readh
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sendresult b = liftIO $ do
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hPutStrLn writeh $ serialize b
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hFlush writeh
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sendRequest :: Transfer -> AssociatedFile -> Handle -> IO ()
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sendRequest t f h = do
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hPutStr h $ intercalate fieldSep
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[ serialize (transferDirection t)
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, serialize (transferUUID t)
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, serialize (transferKey t)
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, serialize f
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, "" -- adds a trailing null
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]
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hFlush h
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readResponse :: Handle -> IO Bool
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readResponse h = fromMaybe False . deserialize <$> hGetLine h
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fieldSep :: String
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fieldSep = "\0"
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class TCSerialized a where
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serialize :: a -> String
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deserialize :: String -> Maybe a
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instance TCSerialized Bool where
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serialize True = "1"
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serialize False = "0"
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deserialize "1" = Just True
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deserialize "0" = Just False
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deserialize _ = Nothing
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instance TCSerialized Direction where
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serialize Upload = "u"
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serialize Download = "d"
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deserialize "u" = Just Upload
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deserialize "d" = Just Download
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deserialize _ = Nothing
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instance TCSerialized AssociatedFile where
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serialize (Just f) = f
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serialize Nothing = ""
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deserialize "" = Just Nothing
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deserialize f = Just $ Just f
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instance TCSerialized UUID where
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serialize = fromUUID
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deserialize = Just . toUUID
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instance TCSerialized Key where
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serialize = key2file
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deserialize = file2key
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