CODEWITHSUNDEEP
haskellwebsocket
ciembor
ciembor

Reputation: 7337

Simple Haskell WebSockets application -- connection is closed just after client starts (connection is ready, but not opened)

OK, this is continuation of this topic: How to run official example of Haskell WebSockets library. I want a server which will response to every client request in a loop. 

{-# LANGUAGE OverloadedStrings #-}

import Data.Char (isPunctuation, isSpace)
import Data.Monoid (mappend)
import Data.Text (Text)
import Control.Exception (fromException)
import Control.Monad (forM_, forever)
import Control.Concurrent (MVar, newMVar, modifyMVar_, readMVar)
import Control.Monad.IO.Class (liftIO)
import qualified Data.Text as T
import qualified Data.Text.IO as T
import Network.WebSockets

meow :: TextProtocol p => WebSockets p ()
meow = forever $ do
    msg <- receiveData
    sendTextData $ msg `T.append` ", meow."

app :: Request -> WebSockets Hybi00 ()
app _ = meow

main :: IO ()
main = runServer "0.0.0.0" 8000 app

Now I try to use it from JavaScript:

var socket;  
var host = "ws://localhost:8000";  
var socket = new WebSocket(host);  
    console.log("ready");  
    socket.onopen = function(){  
         console.log("open");  
         socket.send("cats do ");
    }  
    socket.onmessage = function(msg){  
         console.log("msg");  
    }  
    socket.onclose = function(){  
         console.log("close");  
    }

But connection is closed just after client starts (connection is ready, but not opened). I expected something else...

Upvotes: 4

Views: 981

Answers (1)

shang
shang

Reputation: 24802

You need to accept the request before you can start using the websocket connection. E.g.

app :: Request -> WebSockets Hybi00 ()
app req = do
    acceptRequest req
    meow

Upvotes: 3

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