gameServer/ClientIO.hs
author sheepluva
Sat, 01 Jan 2011 14:23:39 +0100
changeset 4802 4c1041eef577
parent 4570 fa19f0579083
child 4904 0eab727d4717
permissions -rw-r--r--
fix very ancient typo in CheckCollision() that would cause check for collision at bottom and right instead of movement direction
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{-# LANGUAGE ScopedTypeVariables #-}
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module ClientIO where
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import qualified Control.Exception as Exception
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import Control.Concurrent.Chan
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import Control.Concurrent
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import Control.Monad
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import System.IO
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import qualified Data.ByteString.UTF8 as BUTF8
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import qualified Data.ByteString as B
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----------------
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import CoreTypes
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listenLoop :: Handle -> Int -> [String] -> Chan CoreMessage -> Int -> IO ()
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listenLoop handle linesNumber buf chan clientID = do
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    str <- liftM BUTF8.toString $ B.hGetLine handle
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    if (linesNumber > 50) || (length str > 20000) then
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        writeChan chan $ ClientMessage (clientID, ["QUIT", "Protocol violation"])
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        else
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        if str == "" then do
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            writeChan chan $ ClientMessage (clientID, buf)
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            yield
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            listenLoop handle 0 [] chan clientID
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            else
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            listenLoop handle (linesNumber + 1) (buf ++ [str]) chan clientID
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clientRecvLoop :: Handle -> Chan CoreMessage -> Int -> IO ()
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clientRecvLoop handle chan clientID =
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    listenLoop handle 0 [] chan clientID
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        `catch` (\e -> clientOff (show e) >> return ())
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    where clientOff msg = writeChan chan $ ClientMessage (clientID, ["QUIT", msg]) -- if the client disconnects, we perform as if it sent QUIT message
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clientSendLoop :: Handle -> Chan CoreMessage -> Chan [String] -> Int -> IO()
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clientSendLoop handle coreChan chan clientID = do
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    answer <- readChan chan
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    doClose <- Exception.handle
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        (\(e :: Exception.IOException) -> if isQuit answer then return True else sendQuit e >> return False) $ do
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            B.hPutStrLn handle $ BUTF8.fromString $ unlines answer
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            hFlush handle
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            return $ isQuit answer
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    if doClose then
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        Exception.handle (\(_ :: Exception.IOException) -> putStrLn "error on hClose") $ hClose handle
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        else
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        clientSendLoop handle coreChan chan clientID
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    where
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        sendQuit e = writeChan coreChan $ ClientMessage (clientID, ["QUIT", show e])
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        isQuit ("BYE":xs) = True
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        isQuit _ = False