40 lines
894 B
JavaScript
40 lines
894 B
JavaScript
'use strict';
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const EventEmitter = require('events');
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// wrapper around the Node.js ws module
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// for use in browsers
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class WebSocketWrapper extends EventEmitter {
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constructor(url) {
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super();
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this._ws = new WebSocket(url); // eslint-disable-line no-undef
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this._ws.onopen = () => {
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this.emit('open');
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};
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this._ws.onclose = () => {
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this.emit('close');
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};
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this._ws.onmessage = (event) => {
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this.emit('message', event.data);
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};
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this._ws.onerror = () => {
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this.emit('error', new Error('WebSocket error'));
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};
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}
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close() {
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this._ws.close();
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}
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send(data, callback) {
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try {
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this._ws.send(data);
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callback();
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} catch (err) {
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callback(err);
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}
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}
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}
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module.exports = WebSocketWrapper;
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