142 lines
4 KiB
Haskell
142 lines
4 KiB
Haskell
{- git-remote-daemon core
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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 RemoteDaemon.Core (runForeground) where
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import qualified Annex
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import Common
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import Types.GitConfig
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import RemoteDaemon.Common
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import RemoteDaemon.Types
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import RemoteDaemon.Transport
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import qualified Git
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import qualified Git.Types as Git
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import qualified Git.CurrentRepo
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import Utility.SimpleProtocol
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import Config
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import Annex.Ssh
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import Control.Concurrent
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import Control.Concurrent.Async
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import Control.Concurrent.STM
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import Network.URI
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import qualified Data.Map as M
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runForeground :: IO ()
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runForeground = do
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(readh, writeh) <- dupIoHandles
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ichan <- newTChanIO :: IO (TChan Consumed)
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ochan <- newTChanIO :: IO (TChan Emitted)
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let reader = forever $ do
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l <- hGetLine readh
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case parseMessage l of
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Nothing -> error $ "protocol error: " ++ l
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Just cmd -> atomically $ writeTChan ichan cmd
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let writer = forever $ do
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msg <- atomically $ readTChan ochan
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hPutStrLn writeh $ unwords $ formatMessage msg
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hFlush writeh
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let controller = runController ichan ochan
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-- If any thread fails, the rest will be killed.
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void $ tryIO $
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reader `concurrently` writer `concurrently` controller
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type RemoteMap = M.Map Git.Repo (IO (), TChan Consumed)
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-- Runs the transports, dispatching messages to them, and handling
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-- the main control messages.
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runController :: TChan Consumed -> TChan Emitted -> IO ()
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runController ichan ochan = do
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h <- genTransportHandle
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m <- genRemoteMap h ochan
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startrunning m
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go h False m
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where
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go h paused m = do
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cmd <- atomically $ readTChan ichan
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case cmd of
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RELOAD -> do
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h' <- updateTransportHandle h
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m' <- genRemoteMap h' ochan
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let common = M.intersection m m'
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let new = M.difference m' m
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let old = M.difference m m'
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broadcast STOP old
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unless paused $
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startrunning new
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go h' paused (M.union common new)
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LOSTNET -> do
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-- force close all cached ssh connections
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-- (done here so that if there are multiple
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-- ssh remotes, it's only done once)
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liftAnnex h forceSshCleanup
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broadcast LOSTNET m
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go h True m
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PAUSE -> do
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broadcast STOP m
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go h True m
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RESUME -> do
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when paused $
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startrunning m
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go h False m
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STOP -> exitSuccess
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-- All remaining messages are sent to
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-- all Transports.
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msg -> do
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unless paused $ atomically $
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forM_ chans (`writeTChan` msg)
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go h paused m
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where
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chans = map snd (M.elems m)
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startrunning m = forM_ (M.elems m) startrunning'
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startrunning' (transport, c) = do
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-- drain any old control messages from the channel
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-- to avoid confusing the transport with them
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atomically $ drain c
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void $ async transport
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drain c = maybe noop (const $ drain c) =<< tryReadTChan c
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broadcast msg m = atomically $ forM_ (M.elems m) send
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where
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send (_, c) = writeTChan c msg
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-- Generates a map with a transport for each supported remote in the git repo,
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-- except those that have annex.sync = false
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genRemoteMap :: TransportHandle -> TChan Emitted -> IO RemoteMap
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genRemoteMap h@(TransportHandle (LocalRepo g) _) ochan =
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M.fromList . catMaybes <$> mapM gen (Git.remotes g)
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where
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gen r = case Git.location r of
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Git.Url u -> case M.lookup (uriScheme u) remoteTransports of
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Just transport
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| remoteAnnexSync gc -> do
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ichan <- newTChanIO :: IO (TChan Consumed)
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return $ Just
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( r
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, (transport (RemoteRepo r gc) (RemoteURI u) h ichan ochan, ichan)
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)
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_ -> return Nothing
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_ -> return Nothing
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where
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gc = extractRemoteGitConfig g (Git.repoDescribe r)
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genTransportHandle :: IO TransportHandle
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genTransportHandle = do
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annexstate <- newMVar =<< Annex.new =<< Git.CurrentRepo.get
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g <- Annex.repo <$> readMVar annexstate
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return $ TransportHandle (LocalRepo g) annexstate
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updateTransportHandle :: TransportHandle -> IO TransportHandle
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updateTransportHandle h@(TransportHandle _g annexstate) = do
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g' <- liftAnnex h $ do
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reloadConfig
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Annex.fromRepo id
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return (TransportHandle (LocalRepo g') annexstate)
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