move all preview drawing code into its own class (for a simplified and more readable MapConfigViewController)
{-# LANGUAGE ScopedTypeVariables, OverloadedStrings #-}
module ClientIO where
import qualified Control.Exception as Exception
import Control.Concurrent.Chan
import Control.Concurrent
import Control.Monad
import System.IO
import Network
import Network.Socket.ByteString
import qualified Data.ByteString.Char8 as B
----------------
import CoreTypes
import RoomsAndClients
import Utils
pDelim :: B.ByteString
pDelim = B.pack "\n\n"
bs2Packets :: B.ByteString -> ([[B.ByteString]], B.ByteString)
bs2Packets buf = unfoldrE extractPackets buf
where
extractPackets :: B.ByteString -> Either B.ByteString ([B.ByteString], B.ByteString)
extractPackets buf =
let buf' = until (not . B.isPrefixOf pDelim) (B.drop 2) buf in
let (bsPacket, bufTail) = B.breakSubstring pDelim buf' in
if B.null bufTail then
Left bsPacket
else
if B.null bsPacket then
Left bufTail
else
Right (B.splitWith (== '\n') bsPacket, bufTail)
listenLoop :: Socket -> Chan CoreMessage -> ClientIndex -> IO ()
listenLoop sock chan ci = recieveWithBufferLoop B.empty
where
recieveWithBufferLoop recvBuf = do
recvBS <- recv sock 4096
-- putStrLn $ show sock ++ " got smth: " ++ (show $ B.length recvBS)
unless (B.null recvBS) $ do
let (packets, newrecvBuf) = bs2Packets $ B.append recvBuf recvBS
forM_ packets sendPacket
recieveWithBufferLoop newrecvBuf
sendPacket packet = writeChan chan $ ClientMessage (ci, packet)
clientRecvLoop :: Socket -> Chan CoreMessage -> ClientIndex -> IO ()
clientRecvLoop s chan ci = do
msg <- (listenLoop s chan ci >> return "Connection closed") `catch` (return . B.pack . show)
clientOff msg
where
clientOff msg = mapM_ (writeChan chan) [ClientMessage (ci, ["QUIT", msg]), Remove ci]
clientSendLoop :: Socket -> Chan CoreMessage -> Chan [B.ByteString] -> ClientIndex -> IO()
clientSendLoop s coreChan chan ci = do
answer <- readChan chan
Exception.handle
(\(e :: Exception.IOException) -> when (not $ isQuit answer) $ sendQuit e) $ do
sendAll s $ (B.unlines answer) `B.append` (B.singleton '\n')
if (isQuit answer) then
Exception.handle (\(_ :: Exception.IOException) -> putStrLn "error on sClose") $ sClose s
else
clientSendLoop s coreChan chan ci
where
--sendQuit e = writeChan coreChan $ ClientMessage (ci, ["QUIT", B.pack $ show e])
sendQuit e = putStrLn $ show e
isQuit ("BYE":xs) = True
isQuit _ = False