wizard-wipeout/src-client/Client/Communication.hs

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{-# LANGUAGE LambdaCase #-}
module Client.Communication where
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import Control.Monad (void)
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import qualified Data.Aeson as A
import qualified Data.ByteString as B
import qualified Data.ByteString.Lazy.Char8 as B8
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import qualified Data.Vector.Storable as VS
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import Foreign hiding (void)
import Network.Socket
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-- internal imports
import Library.Types
connectSocket
:: FilePath
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-> IO Socket
connectSocket path = do
sock <- socket AF_UNIX Stream defaultProtocol
setSocketOption sock KeepAlive 1
connect sock (SockAddrUnix path)
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pure sock
-- | Sends a specified message through given socket to the server
sendMessage
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:: ClientMessage
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-> Socket
-> IO ()
sendMessage msg sock = do
let msgJson = A.encode msg
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msgVector = VS.fromList $ B.unpack $ B.toStrict msgJson
VS.unsafeWith
msgVector
(\ptr -> void $ sendBuf sock ptr (VS.length msgVector))
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receiveMessage
:: Socket
-> IO ServerMessage
receiveMessage sock = do
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let maxBufferLength = 4096
ptr <- mallocArray maxBufferLength
bufferLength <- recvBuf sock ptr maxBufferLength
msg <- B.pack <$> peekArray bufferLength ptr
let mJsonMsg = A.decode' $ B8.fromStrict msg
jsonMsg <- maybe
(error $ "unexpected message from Server: " <> show msg)
pure
mJsonMsg
free ptr
pure jsonMsg