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{- P2P protocol, partial IO implementation
-
- Copyright 2016 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU GPL version 3 or higher.
-}
{-# LANGUAGE RankNTypes #-}
module Remote.Helper.P2P.IO
( RunProto
, runNetProtoHandle
) where
import Remote.Helper.P2P
import Utility.Process
import Git
import Git.Command
import Utility.SafeCommand
import Utility.SimpleProtocol
import Control.Monad
import Control.Monad.Free
import Control.Monad.IO.Class
import Data.Maybe
import System.Exit (ExitCode(..))
import System.IO
import Control.Concurrent
import qualified Data.ByteString as B
import qualified Data.ByteString.Lazy as L
type RunProto = forall a m. MonadIO m => Proto a -> m a
data S = S
{ repo :: Repo
, hdl :: Handle
}
-- Implementation of the protocol, communicating with a peer
-- over a Handle. No Local actions will be run.
runNetProtoHandle :: MonadIO m => Handle -> Repo -> Proto a -> m a
runNetProtoHandle h r = go
where
go :: RunProto
go (Pure a) = pure a
go (Free (Net n)) = runNetHandle (S r h) go n
go (Free (Local _)) = error "local actions not allowed"
runNetHandle :: MonadIO m => S -> RunProto -> NetF (Proto a) -> m a
runNetHandle s runner f = case f of
SendMessage m next -> do
liftIO $ do
hPutStrLn (hdl s) (unwords (formatMessage m))
hFlush (hdl s)
runner next
ReceiveMessage next -> do
l <- liftIO $ hGetLine (hdl s)
let m = fromMaybe (ERROR "protocol parse error")
(parseMessage l)
runner (next m)
SendBytes _len b next -> do
liftIO $ do
L.hPut (hdl s) b
hFlush (hdl s)
runner next
ReceiveBytes (Len n) next -> do
b <- liftIO $ L.hGet (hdl s) (fromIntegral n)
runner (next b)
Relay hout callback next ->
runRelay runner hout callback >>= runner . next
RelayService service callback next ->
runRelayService s runner service callback >>= runner . next
WriteRelay (RelayHandle h) b next -> do
liftIO $ do
L.hPut h b
hFlush h
runner next
runRelay
:: MonadIO m
=> RunProto
-> RelayHandle
-> (RelayData -> Net (Maybe ExitCode))
-> m ExitCode
runRelay runner (RelayHandle hout) callback = do
v <- liftIO newEmptyMVar
_ <- liftIO $ forkIO $ readout v
feeder <- liftIO $ forkIO $ feedin v
exitcode <- liftIO $ drain v
liftIO $ killThread feeder
return exitcode
where
feedin v = forever $ do
m <- runner $ net receiveMessage
putMVar v $ RelayMessage m
readout v = do
b <- B.hGetSome hout 65536
if B.null b
then hClose hout
else do
putMVar v $ RelayData (L.fromChunks [b])
readout v
drain v = do
d <- takeMVar v
r <- runner $ net $ callback d
case r of
Nothing -> drain v
Just exitcode -> return exitcode
runRelayService
:: MonadIO m
=> S
-> RunProto
-> Service
-> (RelayHandle -> RelayData -> Net (Maybe ExitCode))
-> m ExitCode
runRelayService s runner service callback = do
v <- liftIO newEmptyMVar
(Just hin, Just hout, _, pid) <- liftIO $ createProcess serviceproc
{ std_out = CreatePipe
, std_in = CreatePipe
}
_ <- liftIO $ forkIO $ readout v hout
feeder <- liftIO $ forkIO $ feedin v
_ <- liftIO $ forkIO $ putMVar v . Left =<< waitForProcess pid
exitcode <- liftIO $ drain v hin
liftIO $ killThread feeder
return exitcode
where
cmd = case service of
UploadPack -> "upload-pack"
ReceivePack -> "receive-pack"
serviceproc = gitCreateProcess [Param cmd, File (repoPath (repo s))] (repo s)
drain v hin = do
d <- takeMVar v
case d of
Left exitcode -> do
hClose hin
return exitcode
Right relaydata -> do
_ <- runner $ net $
callback (RelayHandle hin) relaydata
drain v hin
readout v hout = do
b <- B.hGetSome hout 65536
if B.null b
then hClose hout
else do
putMVar v $ Right $
RelayData (L.fromChunks [b])
readout v hout
feedin v = forever $ do
m <- runner $ net receiveMessage
putMVar v $ Right $ RelayMessage m
|
