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|
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RankNTypes #-}
module ServerC
( doServer
, ConnId(..)
, ServerHandle
, quitListening
) where
import Network.Socket as Socket
import Data.ByteString.Lazy.Char8 as L
( putStrLn )
import Data.ByteString.Char8
( hGetNonBlocking
)
import qualified Data.ByteString.Char8 as S
( hPutStr
)
import System.IO
( IOMode(..)
, hSetBuffering
, BufferMode(..)
, hWaitForInput
, hClose
, hIsEOF
)
import Control.Monad
import Control.Concurrent (forkIO,threadDelay)
import Control.Exception (handle,SomeException(..))
import Data.HList
import Data.HList.TypeEqGeneric1()
import Data.HList.TypeCastGeneric1()
import System.IO.Error
import Data.Conduit
import Control.Monad.Trans.Class (lift)
import Control.Monad.IO.Class (MonadIO (liftIO))
import qualified Data.ByteString as S (ByteString)
import System.IO (Handle)
import ByteStringOperators
import SocketLike
newtype ConnId = ConnId Int
deriving Eq
newtype ServerHandle = ServerHandle Socket
quitListening :: ServerHandle -> IO ()
quitListening (ServerHandle socket) = sClose socket
data AcceptResult =
GotConnection (Socket,SockAddr)
| Retry
| QuitOnException
doServer ::
MonadIO m =>
HCons Socket.Family (HCons PortNumber l)
-> (HCons RestrictedSocket (HCons ConnId l)
-> Source m S.ByteString
-> Sink S.ByteString m ()
-> IO ())
-> IO ServerHandle
doServer (HCons family port) g = runServer port (runConn g)
where
runServer (HCons port st) go = do
sock <- socket family Stream 0
setSocketOption sock ReuseAddr 1
case family of
AF_INET -> bindSocket sock (SockAddrInet port iNADDR_ANY)
AF_INET6 -> bindSocket sock (SockAddrInet6 port 0 iN6ADDR_ANY 0)
listen sock 2
forkIO $ do
mainLoop sock (ConnId 0) go
-- L.putStrLn $ "quit accept loop"
return (ServerHandle sock)
where
mainLoop sock idnum@(ConnId n) go = do
let doException ioerror = do
let typ = ioeGetErrorType ioerror
case bshow typ of
-- ResourceExhausted
"resource exhausted" -> return Retry
-- InvalidArgument
"invalid argument" -> L.putStrLn "quit accept-loop." >> return QuitOnException
_ -> do
L.putStrLn ("accept-loop exception: " <++> bshow ioerror <++> "\n")
return QuitOnException
mcon <- handle doException $ fix $ \loop -> do
con <- accept sock
return $ GotConnection con
case mcon of
GotConnection con -> do
forkIO $ go (idnum `HCons` st) con
mainLoop sock (ConnId (n+1)) go
Retry -> threadDelay 500000 >> mainLoop sock idnum go
QuitOnException -> return ()
packets :: MonadIO m => Handle -> Source m S.ByteString
packets h = do
packet <- lift $ liftIO $ getPacket h
yield packet
isEof <- lift $ liftIO $ hIsEOF h
when (not isEof) (packets h)
where
getPacket h = do { hWaitForInput h (-1) ; hGetNonBlocking h 1024 }
outgoing :: MonadIO m => Handle -> Sink S.ByteString m ()
outgoing h = do
mpacket <- await
maybe (return ())
(\r -> (lift . liftIO . S.hPutStr h $ r) >> outgoing h)
mpacket
runConn ::
MonadIO m =>
(HCons RestrictedSocket st
-> Source m S.ByteString
-> Sink S.ByteString m ()
-> IO ())
-> st
-> (Socket, t)
-> IO ()
runConn g st (sock,_) = do
h <- socketToHandle sock ReadWriteMode
hSetBuffering h NoBuffering
let doException (SomeException e) = Prelude.putStrLn ("\n\nexception: " ++ show e ++ "\n\n")
handle doException (g (restrictSocket sock `HCons` st) (packets h) (outgoing h))
hClose h
|
