450ee53ab6
Most of the time, there will be no discreprancy between programPath and readProgramFile. But, the programFile might have been written by an old version of git-annex that is still installed, while a newer one is currently running. In this case, we want to run the same one that's currently running. This is especially important for things like the GIT_SSH=git-annex used for ssh connection caching. The only code that still uses readProgramFile directly is the upgrade code, which needs to know where the standalone git-annex was installed, in order to upgrade it.
121 lines
3.5 KiB
Haskell
121 lines
3.5 KiB
Haskell
{- git-annex assistant communication with remotedaemon
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-
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- Copyright 2014 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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module Assistant.Threads.RemoteControl where
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import Assistant.Common
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import RemoteDaemon.Types
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import Annex.Path
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import Utility.Batch
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import Utility.SimpleProtocol
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import Assistant.Alert
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import Assistant.Alert.Utility
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import Assistant.DaemonStatus
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import qualified Git
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import qualified Git.Types as Git
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import qualified Remote
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import qualified Types.Remote as Remote
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import Control.Concurrent
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import Control.Concurrent.Async
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import Network.URI
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import qualified Data.Map as M
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import qualified Data.Set as S
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remoteControlThread :: NamedThread
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remoteControlThread = namedThread "RemoteControl" $ do
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program <- liftIO programPath
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(cmd, params) <- liftIO $ toBatchCommand
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(program, [Param "remotedaemon"])
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let p = proc cmd (toCommand params)
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(Just toh, Just fromh, _, pid) <- liftIO $ createProcess p
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{ std_in = CreatePipe
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, std_out = CreatePipe
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}
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urimap <- liftIO . newMVar =<< liftAnnex getURIMap
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controller <- asIO $ remoteControllerThread toh
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responder <- asIO $ remoteResponderThread fromh urimap
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-- run controller and responder until the remotedaemon dies
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liftIO $ void $ tryNonAsync $ controller `concurrently` responder
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debug ["remotedaemon exited"]
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liftIO $ forceSuccessProcess p pid
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-- feed from the remoteControl channel into the remotedaemon
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remoteControllerThread :: Handle -> Assistant ()
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remoteControllerThread toh = do
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clicker <- getAssistant remoteControl
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forever $ do
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msg <- liftIO $ readChan clicker
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debug [show msg]
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liftIO $ do
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hPutStrLn toh $ unwords $ formatMessage msg
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hFlush toh
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-- read status messages emitted by the remotedaemon and handle them
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remoteResponderThread :: Handle -> MVar (M.Map URI Remote) -> Assistant ()
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remoteResponderThread fromh urimap = go M.empty
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where
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go syncalerts = do
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l <- liftIO $ hGetLine fromh
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debug [l]
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case parseMessage l of
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Just (CONNECTED uri) -> changeconnected S.insert uri
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Just (DISCONNECTED uri) -> changeconnected S.delete uri
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Just (SYNCING uri) -> withr uri $ \r ->
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if M.member (Remote.uuid r) syncalerts
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then go syncalerts
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else do
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i <- addAlert $ syncAlert [r]
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go (M.insert (Remote.uuid r) i syncalerts)
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Just (DONESYNCING uri status) -> withr uri $ \r ->
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case M.lookup (Remote.uuid r) syncalerts of
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Nothing -> cont
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Just i -> do
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let (succeeded, failed) = if status
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then ([r], [])
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else ([], [r])
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updateAlertMap $ mergeAlert i $
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syncResultAlert succeeded failed
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go (M.delete (Remote.uuid r) syncalerts)
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Just (WARNING (RemoteURI uri) msg) -> do
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void $ addAlert $
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warningAlert ("RemoteControl "++ show uri) msg
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cont
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Nothing -> do
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debug ["protocol error from remotedaemon: ", l]
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cont
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where
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cont = go syncalerts
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withr uri = withRemote uri urimap cont
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changeconnected sm uri = withr uri $ \r -> do
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changeCurrentlyConnected $ sm $ Remote.uuid r
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cont
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getURIMap :: Annex (M.Map URI Remote)
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getURIMap = Remote.remoteMap' id (mkk . Git.location . Remote.repo)
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where
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mkk (Git.Url u) = Just u
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mkk _ = Nothing
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withRemote
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:: RemoteURI
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-> MVar (M.Map URI Remote)
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-> Assistant a
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-> (Remote -> Assistant a)
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-> Assistant a
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withRemote (RemoteURI uri) remotemap noremote a = do
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m <- liftIO $ readMVar remotemap
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case M.lookup uri m of
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Just r -> a r
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Nothing -> do
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{- Reload map, in case a new remote has been added. -}
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m' <- liftAnnex getURIMap
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void $ liftIO $ swapMVar remotemap $ m'
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maybe noremote a (M.lookup uri m')
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