127 lines
3.1 KiB
JavaScript
127 lines
3.1 KiB
JavaScript
import EJSON from 'ejson';
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class EventEmitter {
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constructor() {
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this.events = {};
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}
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on(event, listener) {
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if (typeof this.events[event] !== 'object') {
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this.events[event] = [];
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}
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this.events[event].push(listener);
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}
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removeListener(event, listener) {
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if (typeof this.events[event] === 'object') {
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const idx = this.events[event].indexOf(listener);
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if (idx > -1) {
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this.events[event].splice(idx, 1);
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}
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}
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}
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emit(event, ...args) {
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if (typeof this.events[event] === 'object') {
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this.events[event].forEach((listener) => {
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try {
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listener.apply(this, args);
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} catch (e) {
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console.log(e);
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}
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});
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}
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}
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once(event, listener) {
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this.on(event, function g(...args) {
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this.removeListener(event, g);
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listener.apply(this, args);
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});
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}
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}
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export default class Socket extends EventEmitter {
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constructor(url) {
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super();
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this.url = url.replace(/^http/, 'ws');
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this.id = 0;
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this.subscriptions = {};
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this._connect();
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this.ddp = new EventEmitter();
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this.on('ping', () => this.send({ msg: 'pong' }));
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this.on('result', data => this.ddp.emit(data.id, { result: data.result, error: data.error }));
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this.on('ready', data => this.ddp.emit(data.subs[0], data));
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}
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send(obj) {
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return new Promise((resolve, reject) => {
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this.id += 1;
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const id = obj.id || `${ this.id }`;
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this.connection.send(EJSON.stringify({ ...obj, id }));
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this.ddp.once(id, data => (data.error ? reject(data.error) : resolve(data.result || data.subs)));
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});
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}
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_connect() {
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const connection = new WebSocket(`${ this.url }/websocket`);
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connection.onopen = () => {
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this.emit('open');
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this.send({ msg: 'connect', version: '1', support: ['1', 'pre2', 'pre1'] });
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};
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connection.onclose = e => this.emit('disconnected', e);
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// connection.onerror = () => {
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// // alert(error.type);
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// // console.log(error);
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// // console.log(`WebSocket Error ${ JSON.stringify({...error}) }`);
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// };
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connection.onmessage = (e) => {
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const data = EJSON.parse(e.data);
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this.emit(data.msg, data);
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return data.collection && this.emit(data.collection, data);
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};
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// this.on('disconnected', e => alert(JSON.stringify(e)));
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this.connection = connection;
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}
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logout() {
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return this.call('logout').then(() => this.subscriptions = {});
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}
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disconnect() {
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this.emit('disconnected_by_user');
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this.connection.close();
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}
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reconnect() {
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this.disconnect();
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this.once('connected', () => {
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Object.keys(this.subscriptions).forEach((key) => {
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const { name, params } = this.subscriptions[key];
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this.subscriptions[key].unsubscribe();
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this.subscribe(name, params);
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});
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});
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this._connect();
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}
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call(method, ...params) {
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return this.send({
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msg: 'method', method, params
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});
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}
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unsubscribe(id) {
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if (!this.subscriptions[id]) {
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return Promise.reject();
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}
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delete this.subscriptions[id];
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return this.send({
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msg: 'unsub',
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id
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});
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}
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subscribe(name, ...params) {
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return this.send({
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msg: 'sub', name, params
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}).then((data) => {
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this.subscriptions[data.id] = {
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name,
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params,
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unsubscribe: () => this.unsubscribe(data.id)
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};
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return this.subscriptions[data.id];
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});
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}
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}
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