122 lines
3.7 KiB
JavaScript
122 lines
3.7 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.WebSocket = void 0;
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const transport_1 = require("../transport");
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const debug_1 = require("debug");
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const debug = (0, debug_1.default)("engine:ws");
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class WebSocket extends transport_1.Transport {
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/**
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* WebSocket transport
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*
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* @param {http.IncomingMessage}
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* @api public
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*/
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constructor(req) {
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super(req);
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this.socket = req.websocket;
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this.socket.on("message", (data, isBinary) => {
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const message = isBinary ? data : data.toString();
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debug('received "%s"', message);
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super.onData(message);
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});
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this.socket.once("close", this.onClose.bind(this));
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this.socket.on("error", this.onError.bind(this));
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this.writable = true;
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this.perMessageDeflate = null;
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}
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/**
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* Transport name
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*
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* @api public
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*/
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get name() {
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return "websocket";
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}
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/**
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* Advertise upgrade support.
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*
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* @api public
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*/
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get handlesUpgrades() {
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return true;
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}
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/**
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* Advertise framing support.
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*
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* @api public
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*/
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get supportsFraming() {
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return true;
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}
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/**
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* Writes a packet payload.
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*
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* @param {Array} packets
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* @api private
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*/
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send(packets) {
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this.writable = false;
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for (let i = 0; i < packets.length; i++) {
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const packet = packets[i];
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const isLast = i + 1 === packets.length;
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// always creates a new object since ws modifies it
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const opts = {};
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if (packet.options) {
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opts.compress = packet.options.compress;
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}
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const onSent = (err) => {
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if (err) {
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return this.onError("write error", err.stack);
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}
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else if (isLast) {
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this.writable = true;
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this.emit("drain");
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}
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};
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const send = (data) => {
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if (this.perMessageDeflate) {
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const len = "string" === typeof data ? Buffer.byteLength(data) : data.length;
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if (len < this.perMessageDeflate.threshold) {
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opts.compress = false;
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}
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}
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debug('writing "%s"', data);
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this.socket.send(data, opts, onSent);
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};
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if (packet.options && typeof packet.options.wsPreEncoded === "string") {
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send(packet.options.wsPreEncoded);
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}
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else if (this._canSendPreEncodedFrame(packet)) {
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// the WebSocket frame was computed with WebSocket.Sender.frame()
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// see https://github.com/websockets/ws/issues/617#issuecomment-283002469
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this.socket._sender.sendFrame(packet.options.wsPreEncodedFrame, onSent);
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}
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else {
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this.parser.encodePacket(packet, this.supportsBinary, send);
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}
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}
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}
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/**
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* Whether the encoding of the WebSocket frame can be skipped.
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* @param packet
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* @private
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*/
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_canSendPreEncodedFrame(packet) {
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var _a, _b, _c;
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return (!this.perMessageDeflate &&
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typeof ((_b = (_a = this.socket) === null || _a === void 0 ? void 0 : _a._sender) === null || _b === void 0 ? void 0 : _b.sendFrame) === "function" &&
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((_c = packet.options) === null || _c === void 0 ? void 0 : _c.wsPreEncodedFrame) !== undefined);
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}
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/**
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* Closes the transport.
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*
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* @api private
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*/
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doClose(fn) {
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debug("closing");
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this.socket.close();
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fn && fn();
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}
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}
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exports.WebSocket = WebSocket;
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