Message data missing or overlaps previous data

[falsecz]

start emmiting multiple messages immediately after socket connected
results to message data loss or overlap

emitting multiple messages in short time interval
for eg: (message name, data)

short shortdata
long long
short shortdata
long long

in some cases data are invalid decoded

short shortdata
long long
short shortdata
long shortdata <--- invalid

needs to reproduces:

• real iOS device
• enable network link conditioner, for eg. Dsl or worse
• try multiple time, or try tune setInterval delay or increase cnt

backend

var app = require('http').createServer()

app.listen(8900)

io = require('socket.io')(app)
var x = 0;
var r = []
for(var i = 0; i < 3072; i++) {
    r.push(80)
}

io.sockets.on("connection", function(socket) {
    console.log("ccccc", r.length)
    var cnt = 0
    var t = setInterval(function(){

        socket.emit("shortm", new Buffer("DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD"));
        socket.emit("longm", new Buffer(r));
        if(cnt++ > 8) {
            clearInterval(t)
        }

    }, 20)
})

ios

    let socket = SocketIOClient(socketURL: "10.0.0.6:8900", opts:["log": false])
    ...
    self.socket.onAny { (e) -> Void in
        dispatch_async(dispatch_get_main_queue()) {
            if(e.event == "connect") {
                return
            }
            let d = e.items![0] as! NSData

            if(e.event != "shortm" && e.event != "longm") {
                fatalError("invalid event");
            }

            if(e.event == "shortm" && d.length != 31) {
                fatalError("invalid short message length \(d.length)")
            }
            if(e.event == "longm" && d.length != 3072) {
                fatalError("invalid long message length \(d.length)")
            }
        }

    }
    self.socket.connect()

there is socket.io log https://gist.github.com/falsecz/4a78d945ffa8c9ceb275
as you can see on line 73, there is long message header followed by short message header, but long data is missing

[nuclearace]

Well first off, I seem to be having trouble with node.js 4.0.0 and buffers

[nuclearace]

Yeah with node.js 4.0.0 and socket.io sending Buffers seems to be broken.

[falsecz]

sorry I've forgotten append versions info

nodejs v0.12.7
npm socket.io 1.3.6

socket.ui-client-swift v2.4.5
XCode 6.4

[nuclearace]

Okay, I fixed my 4.0.0 issue. We need to update the engine version in socket.io to the latest

[nuclearace]

Okay, from what I'm seeing so far, it's a problem when the client is switching from polling to websockets. Doesn't seem to happen when using polling or websockets only

[nuclearace]

Should be fixed in the latest version. Although the latest version will require Swift 2 and Xcode 7, which should be coming out in 2 days

[falsecz]

It works, Thank You!