77 lines
1.9 KiB
JavaScript
77 lines
1.9 KiB
JavaScript
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const util = require("util");
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const Base = require("../structures/Base");
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let EventEmitter;
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try {
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EventEmitter = require("eventemitter3");
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} catch(err) {
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EventEmitter = require("events").EventEmitter;
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}
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class BrowserWebSocketError extends Error {
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constructor(message, event) {
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super(message);
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this.event = event;
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}
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}
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/**
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* Represents a browser's websocket usable by Eris
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* @extends EventEmitter
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* @prop {String} url The URL to connect to
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*/
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class BrowserWebSocket extends EventEmitter {
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constructor(url) {
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super();
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if(typeof window === "undefined") {
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throw new Error("BrowserWebSocket cannot be used outside of a browser environment");
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}
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this._ws = new window.WebSocket(url);
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this._ws.onopen = () => this.emit("open");
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this._ws.onmessage = this._onMessage.bind(this);
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this._ws.onerror = (event) => this.emit("error", new BrowserWebSocketError("Unknown error", event));
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this._ws.onclose = (event) => this.emit("close", event.code, event.reason);
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}
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get readyState() {
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return this._ws.readyState;
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}
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close(code, reason) {
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return this._ws.close(code, reason);
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}
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removeEventListener(type, listener) {
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return this.removeListener(type, listener);
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}
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send(data) {
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return this._ws.send(data);
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}
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terminate() {
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return this._ws.close();
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}
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async _onMessage(event) {
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if(event.data instanceof window.Blob) {
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this.emit("message", await event.data.arrayBuffer());
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} else {
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this.emit("message", event.data);
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}
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}
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[util.inspect.custom]() {
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return Base.prototype[util.inspect.custom].call(this);
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}
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}
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BrowserWebSocket.CONNECTING = 0;
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BrowserWebSocket.OPEN = 1;
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BrowserWebSocket.CLOSING = 2;
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BrowserWebSocket.CLOSED = 3;
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module.exports = BrowserWebSocket;
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