[socket.io] SubscribeMessage / handleConnection fires two events

I’m submitting a…

[ ] Regression 
[x] Bug report
[ ] Feature request
[ ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead post your question on Stack Overflow.

Current behavior

WebSocketGateway methods fire twice for each events / connection Note sure if this is expected but this could be problematic in many cases

Expected behavior

Fire only one event

Minimal reproduction of the problem with instructions

server

@WebSocketGateway()
export class SampleWsGateway {
    @WebSocketServer() server

    @SubscribeMessage("events")
    onEvent(client, data: any): WsResponse<any> {
        console.log("received message on [events], data = ", data)
        return data
    }

    handleConnection(client) {
        console.log("connection to socket... token = ", client.handshake.query.token)
    }
}

client : based on sample-2

        const socket = io('http://localhost:3000', {
            query: {
                token: "sampleToken"
            }
        });
        socket.on('connect', function () {
            console.log('Connected');
            socket.emit('events', { test: 'test' });
        });
        socket.on('events', function (data) {
            console.log('event', data);
        });

Logs from the server :

connection to socket... token =  sampleToken
connection to socket... token =  sampleToken
received message on [events], data =  { test: 'test' }
received message on [events], data =  { test: 'test' }

What is the motivation / use case for changing the behavior?

Environment

Nest version: 5.0.1

 
For Tooling issues:
- Node version: 8.9.4  
- Platform:  

Others:

[Loriot-n]

Sorry, I made a mistake, in my app.module.ts I imported my ws.gateway and my ws.module So it was instantiated twice ! Thanks for the help @BorntraegerMarc

[lock[bot]]

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