wizard-wipeout/src-client/Client/Communication.hs
2024-02-02 15:48:55 +01:00

148 lines
3.4 KiB
Haskell

{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE RecordWildCards #-}
module Client.Communication where
import qualified Control.Concurrent.STM as STM
import Control.Monad.RWS
import qualified Data.Aeson as A
import qualified Data.ByteString as B
import qualified Data.ByteString.Lazy.Char8 as B8
import Data.UUID
import qualified Data.Vector.Storable as VS
import Foreign hiding (void)
import Graphics.Vty as Vty
import Network.Socket
import System.Posix.Signals
-- internal imports
import Library.Types
import Client.Types
connectSocket
:: FilePath
-> IO Socket
connectSocket path = do
sock <- socket AF_UNIX Stream defaultProtocol
setSocketOption sock KeepAlive 1
connect sock (SockAddrUnix path)
pure sock
-- | Sends a specified message through given socket to the server
sendMessage
:: ClientMessage
-> Socket
-> IO ()
sendMessage msg sock = do
let msgJson = A.encode msg
msgVector = VS.fromList $ B.unpack $ B.toStrict msgJson
VS.unsafeWith
msgVector
(\ptr -> void $ sendBuf sock ptr (VS.length msgVector))
handleMessages
:: Game ()
handleMessages = do
queue <- asks rcQueue
msgs <- liftIO $ STM.atomically $ STM.flushTQueue queue
mapM_
handleMessage
msgs
handleMessage
:: ServerMessage
-> Game ()
handleMessage ServerQuit = do
st <- get
let stateCont = scClientState st
liftIO $ STM.atomically $ do
stateContainer <- STM.readTMVar stateCont
void $ STM.swapTMVar stateCont $ stateContainer
{ clientStop = True
}
put $ st
{ scClientState = stateCont
}
liftIO $ putStrLn "Quitting due to server shutdown"
handleMessage (Ping id') = do
cid <- asks rcClientUUID
sock <- asks rcSocket
liftIO $ sendMessage
( ClientMessage
cid
(Pong id')
)
sock
handleMessage (TickUpdate slice wizard) = do
modify' (\st@(StateContainer {}) ->
st
{ scWizard = wizard
, scMapSlice = slice
}
)
handleMessage x =
liftIO $ putStrLn $ "received unexpected message from server: " <> show x
receiveMessage
:: Socket
-> STM.TQueue ServerMessage
-> IO ()
receiveMessage sock queue = do
let maxBufferLength = 4096
ptr <- mallocArray maxBufferLength
bufferLength <- recvBuf sock ptr maxBufferLength
rawMsg <- B.pack <$> peekArray bufferLength ptr
let msgs =
if B.length rawMsg < 1
then []
else map B8.tail $ init $ B8.split '>' $ B8.fromStrict rawMsg
mapM_
(\msg -> do
let mJsonMsg = A.decode' msg
maybe
(putStrLn $ "received garbled data: " <> B8.unpack (B8.fromStrict rawMsg))
(STM.atomically . STM.writeTQueue queue)
mJsonMsg
)
msgs
-- | Function that installs a handler on SIGINT to terminate game
terminateGameOnSigint
:: Game ()
terminateGameOnSigint = do
-- sock <- asks rcSocket
-- clientId <- asks rcClientUUID
clientState <- gets scClientState
void $ liftIO $ installHandler
keyboardSignal
(CatchOnce $ do
currentState <- STM.atomically $ do
currentState <- STM.readTMVar clientState
void $ STM.swapTMVar clientState $ currentState { clientStop = True }
pure currentState
Vty.shutdown (clientVty currentState)
-- partingMessage clientId sock
-- Raise SIGINT again so it does not get blocked
-- raiseSignal keyboardSignal
)
Nothing
partingMessage
:: UUID
-> Socket
-> IO ()
partingMessage clientId sock = do
sendMessage (ClientMessage clientId ClientQuit) sock
-- close sock