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{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE TypeOperators #-}
{-# LANGUAGE OverloadedStrings #-}
module Server where
import Network.Socket
import Data.ByteString.Lazy.Char8 as L
( fromChunks
, putStrLn )
import Data.ByteString.Char8
( hGetNonBlocking
)
import System.IO
( IOMode(..)
, hSetBuffering
, BufferMode(..)
, hWaitForInput
, hClose
, hIsEOF
)
import Control.Monad
import Control.Concurrent (forkIO)
import Control.Exception (handle,SomeException(..))
import Data.HList
import Data.HList.TypeEqGeneric1()
import Data.HList.TypeCastGeneric1()
import System.IO.Error
import ByteStringOperators
newtype ConnId = ConnId Int
deriving Eq
newtype ConnectionFinalizer = ConnectionFinalizer (IO ())
getPacket h = do { hWaitForInput h (-1) ; fmap (fromChunks . (:[])) $ hGetNonBlocking h 1024 }
newtype ServerHandle = ServerHandle Socket
quitListening :: ServerHandle -> IO ()
quitListening (ServerHandle socket) = sClose socket
doServer addrfamily port g startCon = do
doServer' addrfamily port g startCon
doServer' family port g startCon = runServer2 port (runConn2 g)
where
runConn2 g st (sock,_) = do
h <- socketToHandle sock ReadWriteMode
hSetBuffering h NoBuffering
st'' <- startCon sock (h .*. st)
let doException (SomeException e) = Prelude.putStrLn ("\n\nexception: " ++ show e ++ "\n\n")
handle doException $ fix $ \loop -> do
let continue () = hIsEOF h >>= flip when loop . not
packet <- getPacket h
g st'' packet continue
let ConnectionFinalizer cleanup = hOccursFst st''
cleanup
hClose h
{-
runServer2 ::
Num num =>
PortNumber -> (num -> (Socket, SockAddr) -> IO b -> IO b) -> IO b
-}
runServer2 st@(HCons port _) 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
if -- typ == InvalidArgument
-- but the symbol is not exported :/
bshow typ=="invalid argument"
then do
L.putStrLn $ "quit accept-loop."
else do
L.putStrLn ("accept-loop exception: " <++> bshow ioerror <++> "\n")
return Nothing
mcon <- handle doException $ fix $ \loop -> do
con <- accept sock
return $ Just con
case mcon of
Just con -> do
forkIO $ go (idnum .*. st) con
mainLoop sock (ConnId (n+1)) go
Nothing -> return ()
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