62 lines
2.0 KiB
Haskell
62 lines
2.0 KiB
Haskell
module Link.Server where
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import Control.Concurrent
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import Control.Exception hiding (handle)
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import Control.Monad (forever)
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import Network (withSocketsDo, listenOn, accept, PortID(..))
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import System.IO (hClose, hSetNewlineMode, hSetBuffering, BufferMode(..),
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universalNewlineMode, hGetLine, Handle, stdout)
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import Text.Printf (printf)
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import qualified Data.Map.Strict as Map
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import Link.Client
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import Link.Protocol
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import Link.Types
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runServer :: Int -> IO ()
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runServer port = withSocketsDo $ do
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hSetBuffering stdout LineBuffering
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server <- newServer
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sock <- listenOn . PortNumber . fromIntegral $ port
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printf "Listening on port %d\n" port
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forever $ do
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(handle, host, port') <- accept sock
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printf "Accepted connection from %s: %s\n" host (show port')
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forkIO $ connectClient server handle `finally` hClose handle
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connectClient :: Server -> Handle -> IO ()
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connectClient server handle = do
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hSetNewlineMode handle universalNewlineMode
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hSetBuffering handle LineBuffering
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readName
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where
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readName = do
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name <- hGetLine handle
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if null name
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then readName
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else do
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let user = User name
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ok <- checkAddClient server user handle
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case ok of
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Nothing -> do
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printToHandle handle $ formatMessage (NameInUse name)
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readName
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Just client -> do
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sendResponse client $ Connected name
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runClient server client `finally` removeClient server user
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checkAddClient :: Server -> User -> Handle -> IO (Maybe Client)
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checkAddClient Server {..} user@User {..} handle =
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modifyMVar serverUsers $ \clientMap ->
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if Map.member user clientMap
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then return (clientMap, Nothing)
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else do
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client <- newClient user handle
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printf "New user connected: %s\n" userName
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return (Map.insert user client clientMap, Just client)
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removeClient :: Server -> User -> IO ()
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removeClient Server {..} user =
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modifyMVar_ serverUsers $ return . Map.delete user
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