130 lines
3.5 KiB
Haskell
130 lines
3.5 KiB
Haskell
{- git-annex command, used internally by assistant
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-
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- Copyright 2012, 2013 Joey Hess <id@joeyh.name>
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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 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 Utility.SimpleProtocol (dupIoHandles)
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import Git.Types (RemoteName)
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import qualified Database.Keys
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data TransferRequest = TransferRequest Direction Remote Key AssociatedFile
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cmd :: Command
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cmd = command "transferkeys" SectionPlumbing "transfers keys"
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paramNothing (withParams seek)
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seek :: CmdParams -> CommandSeek
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seek = withNothing start
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start :: CommandStart
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start = do
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(readh, writeh) <- liftIO dupIoHandles
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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 (RemoteVerify remote) key $ \t -> do
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r <- Remote.retrieveKeyFile remote key file t p
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-- Make sure we get the current
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-- associated files data for the key,
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-- not old cached data.
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Database.Keys.closeDb
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return r
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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 $ hSetBuffering readh NoBuffering
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go =<< readrequests
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where
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go (d:rn:k:f:rest) = do
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case (deserialize d, deserialize rn, deserialize k, deserialize f) of
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(Just direction, Just remotename, Just key, Just file) -> do
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mremote <- Remote.byName' remotename
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case mremote of
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Left _ -> sendresult False
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Right 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 -> TransferInfo -> Handle -> IO ()
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sendRequest t tinfo h = do
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hPutStr h $ intercalate fieldSep
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[ serialize (transferDirection t)
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, maybe (serialize (fromUUID (transferUUID t)))
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(serialize . Remote.name)
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(transferRemote tinfo)
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, serialize (transferKey t)
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, serialize (associatedFile tinfo)
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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 RemoteName where
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serialize n = n
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deserialize n = Just n
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instance TCSerialized Key where
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serialize = key2file
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deserialize = file2key
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