netserver/Miscutils.hs
author unc0rr
Wed, 30 Apr 2008 20:18:30 +0000
changeset 892 dfe97199f17e
parent 890 1d8c4a5ec622
child 894 2ca76a7f3121
permissions -rw-r--r--
Better QUIT handling imlementation - reduces function return values count
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module Miscutils where
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import IO
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import System.IO
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import Control.Concurrent
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import Control.Concurrent.STM
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import Control.Exception (finally)
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data ClientInfo =
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	ClientInfo
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	{
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		chan :: TChan String,
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		handle :: Handle,
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		nick :: String,
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		room :: String,
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		isMaster :: Bool
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	}
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data RoomInfo =
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	RoomInfo
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	{
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		name :: String,
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		password :: String
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	}
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sendMsg :: Handle -> String -> IO()
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sendMsg clientHandle str = finally (return ()) (hPutStrLn clientHandle str >> hFlush clientHandle) -- catch exception when client tries to send to other
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sendAll :: [Handle] -> String -> IO[()]
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sendAll clientsList str = mapM (\x -> sendMsg x str) clientsList
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sendOthers :: [Handle] -> Handle -> String -> IO[()]
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sendOthers clientsList clientHandle str = sendAll (filter (/= clientHandle) clientsList) str
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extractCmd :: String -> (String, [String])
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extractCmd str = if ws == [] then ("", []) else (head ws, tail ws)
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		where ws = words str
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manipState :: TVar[a] -> ([a] -> [a]) -> IO()
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manipState state op =
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	atomically $ do
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			ls <- readTVar state
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			writeTVar state $ op ls
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manipState2 :: TVar[ClientInfo] -> TVar[RoomInfo] -> ([ClientInfo] -> [RoomInfo] -> ([ClientInfo], [RoomInfo], Bool)) -> IO Bool
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manipState2 state1 state2 op =
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	atomically $ do
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			ls1 <- readTVar state1
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			ls2 <- readTVar state2
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			let (ol1, ol2, res) = op ls1 ls2
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			writeTVar state1 ol1
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			writeTVar state2 ol2
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			return res
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tselect :: [ClientInfo] -> STM (String, ClientInfo)
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tselect = foldl orElse retry . map (\ci -> (flip (,) ci) `fmap` readTChan (chan ci))
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