Usage stats - Total connections

[bristoljon]

Story

As a developer/sysadmin

I want to know the total number of connected clients

So that I can establish load capacity of a single server

Acceptance criteria

• Developer is able to log out the total connections inside onConnect (or anywhere else)

[enisdenjo]

Quite easy, simply use the onConnect and onClose hooks:

import { WebSocketServer } from 'ws';
import { useServer } from 'graphql-ws/lib/use/ws';

const server = new WebSocketServer({
  port: 4000,
  path: '/graphql',
});

let connectedClients = 0;
useServer(
  {
    // ...
    onConnect: () => {
      connectedClients++;
    },
    onClose: () => {
      connectedClients--;
    },
  },
  server,
);

console.log('Listening to port 4000');