90 lines
2.2 KiB
JavaScript
90 lines
2.2 KiB
JavaScript
"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 req
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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.writable = false;
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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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const packet = packets.shift();
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if (typeof packet === "undefined") {
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this.writable = true;
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this.emit("drain");
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return;
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}
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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 send = data => {
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const isBinary = typeof data !== "string";
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const compress = this.perMessageDeflate &&
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Buffer.byteLength(data) > this.perMessageDeflate.threshold;
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debug('writing "%s"', data);
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this.writable = false;
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this.socket.send(data, isBinary, compress);
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this.send(packets);
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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 {
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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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* 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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fn && fn();
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// call fn first since socket.close() immediately emits a "close" event
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this.socket.close();
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}
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}
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exports.WebSocket = WebSocket;
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