module Main where
import Network
import IO
import System.IO
import Control.Concurrent
import Control.Concurrent.STM
import Control.Exception (finally)
import Control.Monad (forM, forM_, filterM, liftM)
import Data.List
import Miscutils
import HWProto
acceptLoop :: Socket -> TChan ClientInfo -> IO ()
acceptLoop servSock acceptChan = do
(cHandle, host, port) <- accept servSock
cChan <- atomically newTChan
forkIO $ clientLoop cHandle cChan
atomically $ writeTChan acceptChan (ClientInfo cChan cHandle "" 0 "" False)
acceptLoop servSock acceptChan
listenLoop :: Handle -> TChan String -> IO ()
listenLoop handle chan = do
str <- hGetLine handle
atomically $ writeTChan chan str
listenLoop handle chan
clientLoop :: Handle -> TChan String -> IO ()
clientLoop handle chan =
listenLoop handle chan
`catch` (const $ clientOff >> return ())
where clientOff = atomically $ writeTChan chan "QUIT"
mainLoop :: Socket -> TChan ClientInfo -> [ClientInfo] -> [RoomInfo] -> IO ()
mainLoop servSock acceptChan clients rooms = do
r <- atomically $ (Left `fmap` readTChan acceptChan) `orElse` (Right `fmap` tselect clients)
case r of
Left ci -> do
mainLoop servSock acceptChan (ci:clients) rooms
Right (line, client) -> do
let (mclient, mrooms, recipients, strs) = handleCmd client clients rooms $ words line
clients' <- forM recipients $
\ci -> do
forM_ strs (\str -> hPutStrLn (handle ci) str)
hFlush (handle ci)
return []
`catch` const (hClose (handle ci) >> return [ci])
client' <- if (not $ null strs) && (head strs == "QUIT") then hClose (handle client) >> return [client] else return []
mainLoop servSock acceptChan (remove (remove (mclient : filter (\cl -> handle cl /= handle client) clients) (concat clients')) client') mrooms
where
remove list rmClients = deleteFirstsBy (\ a b -> handle a == handle b) list rmClients
startServer serverSocket = do
acceptChan <- atomically newTChan
forkIO $ acceptLoop serverSocket acceptChan
mainLoop serverSocket acceptChan [] []
main = withSocketsDo $ do
serverSocket <- listenOn $ Service "hedgewars"
startServer serverSocket `finally` sClose serverSocket