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module HBridge where
import Control.Applicative
import Control.Concurrent
import Control.Exception
import Control.Monad
import qualified Data.ByteString as StrictB
import qualified Data.ByteString.Lazy as LazyB
import Data.Monoid
import Network
import System.IO
strictBridge :: Handle -> Handle -> IO ()
strictBridge a b = forever (flush a b >> flush b a)
where
flush a b = do
bytes <- readAllNonBlocking a
putStrLn =<< handleMessage a b
StrictB.hPut b bytes
readAllNonBlocking h = do
hWaitForInput h (1)
loop mempty
where
loop bytes = do
bytes' <- StrictB.hGetNonBlocking h 0x1000
ready <- hReady h
(if ready then loop else return) (mappend bytes bytes')
lazyBridge :: Handle -> Handle -> IO ()
lazyBridge a b = do forkIO (flush a b)
forkIO (flush b a)
return ()
where
flush a b = LazyB.hGetContents a >>= LazyB.hPut b
doubleDragon a b = do
rwPair <- newEmptyMVar
(forkIO . forever) (postReadyPair rwPair a b)
(forkIO . forever) (postReadyPair rwPair b a)
forever $ do
(r, w) <- takeMVar rwPair
putStrLn =<< handleMessage r w
transfer4K r w
where
postReadyPair rwPair r w = do
hWaitForInput r (1)
putMVar rwPair (r, w)
transfer4K r w = StrictB.hGetNonBlocking r 0x1000 >>= StrictB.hPut w
handleMessage a b = template <$> hShow a <*> hShow b
where
template x y = x ++ "\n -->>>> " ++ y
proxy :: PortID -> PortID -> (Handle -> Handle -> IO())-> IO ()
proxy source dest bridge = do
socket <- listenOn source
finally (acceptLoop socket) (sClose socket)
where
acceptLoop listenSocket = do
(conn, _, _) <- accept listenSocket
_ <- forkIO (connection conn)
acceptLoop listenSocket
connection conn = do
condition conn
conn' <- connectTo "localhost" dest
condition conn'
bridge conn conn'
condition handle = do hSetBuffering handle NoBuffering
hSetBinaryMode handle True
main = proxy (PortNumber 9000) (PortNumber 8000) lazyBridge
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