wizard-wipeout/src-server/Server/Communication.hs

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{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
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module Server.Communication where
import Control.Concurrent
import qualified Control.Concurrent.STM as STM
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import Control.Monad
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import Control.Monad.IO.Class
import Control.Monad.RWS.Strict
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import qualified Data.Aeson as A
import qualified Data.ByteString as B
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import qualified Data.ByteString.Lazy.Char8 as B8
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import Data.List
import Data.Maybe
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import Data.UUID hiding (null)
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import Data.UUID.V4
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import Data.Time
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import qualified Data.Vector.Storable as VS
import Foreign hiding (void)
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import Network.Socket as Net
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import System.Posix.Signals
-- internal imports
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import Library.Types
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import Server.Types
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import Server.Util
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-- | Function which determines whether the given filePath is a supported socket path and
-- subsequently creates a socket in said location.
bindSocket
:: FilePath -- ^ File Path for socket to be created (e.g.: "/tmp/wizard.sock")
-> IO Socket -- ^ resulting Socket
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bindSocket path = do
let sockAddr = SockAddrUnix path
unless (isSupportedSockAddr sockAddr)
(error $ "invalid socket path " <> path)
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-- aremoveIfExists path
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sock <- socket AF_UNIX Stream defaultProtocol
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bind sock sockAddr
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Net.listen sock 5
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pure sock
-- | Function that installs a handler on SIGINT to terminate game
terminateGameOnSigint
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:: FilePath
-> Game ()
terminateGameOnSigint path = do
sock <- asks rcMainSocket
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clientList <- gets scClientSockets
clients <- liftIO $ STM.atomically $ STM.readTMVar clientList
serverState <- gets scServerState
void $ liftIO $ installHandler
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sigINT
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(CatchOnce $ do
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putStrLn "SIGINT caught, terminating…"
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disconnectClients clientList clients
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close sock
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removeIfExists path
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void $ STM.atomically $ STM.swapTMVar serverState (ServerState False True)
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-- Raise SIGINT again so it does not get blocked
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-- raiseSignal sigINT
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)
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Nothing
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disconnectClients
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:: STM.TMVar [(Maybe UUID, Socket)]
-> [(Maybe UUID, Socket)]
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-> IO ()
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disconnectClients clientList = mapM_
(\client@(_, clientSocket) -> do
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sendMessage ServerQuit clientSocket
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dropClient clientList client
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)
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dropClient
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:: STM.TMVar [(Maybe UUID, Socket)]
-> (Maybe UUID, Socket)
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-> IO ()
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dropClient clientList (uuid, clientSocket) = do
STM.atomically $ do
clients <- STM.readTMVar clientList
let reducedClients = filter ((/= uuid) . fst) clients
void $ STM.swapTMVar clientList reducedClients
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putStrLn $ "dropping client " <> show uuid
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close clientSocket
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-- | Process incoming connection requests
processRequests :: Game ()
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processRequests = do
mainSocket <- asks rcMainSocket
socketList <- gets scClientSockets
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void $ liftIO $ forkIO $ acceptConnection mainSocket socketList
where
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acceptConnection mainSocket socketList = do
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putStrLn "accepting new connections…"
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(clientSock, _) <- accept mainSocket
liftIO $ STM.atomically $ do
list <- STM.takeTMVar socketList
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STM.putTMVar socketList ((Nothing, clientSock) : list)
putStrLn "accepted new connection"
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acceptConnection mainSocket socketList
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-- | Sends a specified message through given socket to the client
sendMessage
:: ServerMessage
-> Socket
-> IO ()
sendMessage msg sock = do
let msgJson = A.encode msg
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msgVector = VS.fromList $ B.unpack $ B.toStrict $ ('<' `B8.cons` (msgJson `B8.snoc` '>'))
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-- putStrLn $ "sending: " <> B8.unpack msgJson
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VS.unsafeWith
msgVector
(\ptr -> void $ sendBuf sock ptr (VS.length msgVector))
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-- | receive incoming messages from clients
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receiveMessages
:: STM.TMVar [(Maybe UUID, Socket)]
-> STM.TQueue ClientMessage
-> IO ()
receiveMessages clientsVar queue = do
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clients <- liftIO $ STM.atomically $ STM.readTMVar clientsVar
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mapM_
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(\(_, clientSocket) -> do
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receiveMessage clientSocket queue
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)
clients
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-- | handle received messages
handleMessages :: Game ()
handleMessages = do
queue <- gets scMessageQueue
serverState <- get
readerContainer <- ask
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emptyState <- liftIO $ STM.atomically $ STM.isEmptyTQueue queue
unless emptyState $ do
msgs <- liftIO $ STM.atomically $ STM.flushTQueue queue
void $ liftIO $ do
mapM_
(handleMessage serverState readerContainer)
msgs
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-- | receive a 'ClientMessage'
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receiveMessage
:: Socket
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-> STM.TQueue ClientMessage
-> IO ()
receiveMessage sock queue = do
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let maxBufferLength = 4096
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mmsg <- do
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ptr <- mallocArray maxBufferLength
bufferLength <- recvBuf sock ptr maxBufferLength
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msg <- B.pack <$> peekArray bufferLength ptr
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let mJsonMsg = A.decode' $ B8.fromStrict msg :: Maybe ClientMessage
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free ptr
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if bufferLength > 0
then
pure mJsonMsg
else
pure Nothing
maybe
(pure ())
(\msg -> do
liftIO $ STM.atomically $ STM.writeTQueue queue msg
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-- when (msg == IdRequest) (threadDelay $ 10 ^ 3)
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)
mmsg
-- | function for translating 'ClientMessage's into server actions
handleMessage
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:: StateContainer
-> ReaderContainer
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-> ClientMessage
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-> IO ()
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handleMessage stateContainer readerContainer msg = do
let clientList = scClientSockets stateContainer
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clients <- liftIO $ STM.atomically $ STM.readTMVar clientList
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putStrLn $ "Handling following: " <> show msg
case msg of
IdRequest -> do
clientId <- nextRandom
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let clientIdx = findIndex (isNothing . fst) clients
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let clientSock = snd $ clients !! fromJust clientIdx
let newClients = map
(\old@(muuid, oldClientSock) ->
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if oldClientSock == clientSock && isNothing muuid
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then
(Just clientId, clientSock)
else
old
)
clients
void $ liftIO $ STM.atomically $ STM.swapTMVar clientList newClients
putStrLn $ "Accepted Client with UUID " <> show clientId
sendMessage (AcceptClient clientId) clientSock
ClientMessage clientId payload ->
case payload of
ClientQuit -> do
putStrLn $ "removing client " <> show clientId
let newClients = filter (\a -> fst a /= Just clientId) clients
STM.atomically $ do
currentPlayers <- STM.readTMVar (scPlayers stateContainer)
let newPlayers = filter (\p -> playerId p /= clientId) currentPlayers
void $ STM.swapTMVar (scPlayers stateContainer) newPlayers
void $ STM.swapTMVar clientList newClients
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ClientRequestWizard -> do
putStrLn "initializing new wizard"
let arena = rcMap readerContainer
initPos <- rollInitPosition arena
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now <- liftIO getCurrentTime
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uuid <- nextRandom
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let freshWizard = newWizard initPos
STM.atomically $ do
currentPlayers <- STM.readTMVar (scPlayers stateContainer)
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void $ STM.swapTMVar (scPlayers stateContainer) $
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Player clientId freshWizard False (now, uuid) : currentPlayers
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let clientSock = fromJust $ lookup (Just clientId) clients
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sendMessage (ProvideInitialWizard freshWizard) clientSock
ClientReady -> do
putStrLn $ "client " <> show clientId <> " is ready!"
STM.atomically $ do
currentPlayers <- STM.readTMVar (scPlayers stateContainer)
let (thisPlayers, otherPlayers) =
partition (\p -> playerId p == clientId) currentPlayers
unless (null thisPlayers) $
void $ STM.swapTMVar (scPlayers stateContainer) $
(head thisPlayers) {playerReady = True} : otherPlayers
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Pong uuid -> do
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let client = fromJust (lookup (Just clientId) clients)
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player <- STM.atomically $ do
players <- STM.readTMVar (scPlayers stateContainer)
pure $ head $ filter (\p -> playerId p == clientId) players
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-- if snd (playerLastPong player) /= uuid
-- then do
-- putStrLn $ "dropping client " <> show clientId
-- dropClient clientList (Just clientId, client)
-- else do
now <- getCurrentTime
STM.atomically$ do
players <- STM.readTMVar (scPlayers stateContainer)
let otherPlayers = filter (\a -> playerId a /= playerId player) players
modPlayer = player
{ playerLastPong = (now, uuid)
}
void $ STM.swapTMVar (scPlayers stateContainer) (modPlayer : otherPlayers)
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_ -> pure ()
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sendPings :: Game ()
sendPings = do
now <- liftIO getCurrentTime
maxTimeout <- asks rcClientMaxTimeout
framesPerPing <- asks rcFramesPerPing
fps <- asks rcFPS
stateContainer <- get
players <- liftIO $ STM.atomically $ STM.readTMVar (scPlayers stateContainer)
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sockets <- liftIO $ STM.atomically $ STM.readTMVar (scClientSockets stateContainer)
mapM_
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(\player@(Player plId (Wizard {}) readiness (lastPongTime, _)) -> do
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let timeDiff = realToFrac $ diffUTCTime now lastPongTime
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when (readiness && timeDiff > (fromIntegral framesPerPing * recip (fromIntegral fps))) $ do
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let clientSock = lookup (Just plId) sockets
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when (isJust clientSock) $
if timeDiff > realToFrac maxTimeout
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then do
liftIO $ dropClient (scClientSockets stateContainer) (Just plId, fromJust clientSock)
put stateContainer
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else do
random <- liftIO nextRandom
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let newPong = (lastPongTime, random)
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liftIO $ sendMessage
( Ping random
)
(fromJust clientSock)
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let newPlayer = player
{ playerLastPong = newPong
}
otherPlayers = filter (\a -> playerId a /= plId) players
liftIO $ void $ STM.atomically $
STM.swapTMVar (scPlayers stateContainer) (newPlayer : otherPlayers)
put stateContainer
)
players