websockets v2

controllers.application\.js

import Controller from '@ember/controller';
import { inject as service } from '@ember/service';
import { connect, on } from '../decorators';

@connect('ws://foo.baz')
export default class ApplicationController extends Controller {
  @service websocket;
}

decorators\.js

export function on(event_type, connection_filter){
  if (!['open', 'close', 'message', 'error'].includes(event_type)) {
    throw new Error('invalid event type');
  }
  
  return function (object, property, descriptor) {
		console.log('on');
    // validate that this.websocket exists
    
    this.websocket.addEventListener(event_type, (event) => {
      // check if object is still valid
      object.property.call(object, event);
      
      // then call removeEventListener
    });
  };
};

export function connect(url) {
	return function(object, property, descriptor) {
    console.log('connect')
    console.log(object)
    return this.websocket.connect(url);
  }
}

services.websocket\.js

import Service from '@ember/service';

export default class WebSocket extends Service {
  get name() { 
    return 'foo' 
  }
  
  constructor() {
    super(...arguments);
    console.log('service');
    this.sockets = new WeakMap();
  }
  
  connect(url) {
    // TODO: normalize url
    const socket = new WebSocket(url);
    this.sockets.set(url, socket);
  }
  
  for(url) {
		return this.sockets.get(url);
  }
}

templates.application\.hbs

<h1>Welcome to WebSockets</h1>
<br>
<br>
{{this.websocket.name}}
<br>
<br>

twiddle\.json

{
  "version": "0.17.1",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js",
    "ember": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}