[e29cc2e] | 1 | "use strict";
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| 2 | Object.defineProperty(exports, "__esModule", { value: true });
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| 3 | exports.WebSocket = void 0;
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| 4 | const transport_1 = require("../transport");
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| 5 | const debug_1 = require("debug");
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| 6 | const debug = (0, debug_1.default)("engine:ws");
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| 7 | class WebSocket extends transport_1.Transport {
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| 8 | /**
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| 9 | * WebSocket transport
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| 10 | *
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| 11 | * @param {http.IncomingMessage}
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| 12 | * @api public
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| 13 | */
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| 14 | constructor(req) {
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| 15 | super(req);
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| 16 | this.socket = req.websocket;
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| 17 | this.socket.on("message", (data, isBinary) => {
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| 18 | const message = isBinary ? data : data.toString();
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| 19 | debug('received "%s"', message);
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| 20 | super.onData(message);
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| 21 | });
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| 22 | this.socket.once("close", this.onClose.bind(this));
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| 23 | this.socket.on("error", this.onError.bind(this));
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| 24 | this.writable = true;
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| 25 | this.perMessageDeflate = null;
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| 26 | }
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| 27 | /**
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| 28 | * Transport name
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| 29 | *
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| 30 | * @api public
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| 31 | */
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| 32 | get name() {
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| 33 | return "websocket";
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| 34 | }
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| 35 | /**
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| 36 | * Advertise upgrade support.
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| 37 | *
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| 38 | * @api public
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| 39 | */
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| 40 | get handlesUpgrades() {
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| 41 | return true;
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| 42 | }
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| 43 | /**
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| 44 | * Advertise framing support.
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| 45 | *
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| 46 | * @api public
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| 47 | */
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| 48 | get supportsFraming() {
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| 49 | return true;
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| 50 | }
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| 51 | /**
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| 52 | * Writes a packet payload.
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| 53 | *
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| 54 | * @param {Array} packets
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| 55 | * @api private
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| 56 | */
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| 57 | send(packets) {
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| 58 | const packet = packets.shift();
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| 59 | if (typeof packet === "undefined") {
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| 60 | this.writable = true;
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| 61 | this.emit("drain");
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| 62 | return;
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| 63 | }
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| 64 | // always creates a new object since ws modifies it
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| 65 | const opts = {};
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| 66 | if (packet.options) {
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| 67 | opts.compress = packet.options.compress;
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| 68 | }
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| 69 | const send = data => {
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| 70 | if (this.perMessageDeflate) {
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| 71 | const len = "string" === typeof data ? Buffer.byteLength(data) : data.length;
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| 72 | if (len < this.perMessageDeflate.threshold) {
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| 73 | opts.compress = false;
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| 74 | }
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| 75 | }
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| 76 | debug('writing "%s"', data);
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| 77 | this.writable = false;
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| 78 | this.socket.send(data, opts, err => {
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| 79 | if (err)
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| 80 | return this.onError("write error", err.stack);
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| 81 | this.send(packets);
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| 82 | });
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| 83 | };
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| 84 | if (packet.options && typeof packet.options.wsPreEncoded === "string") {
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| 85 | send(packet.options.wsPreEncoded);
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| 86 | }
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| 87 | else {
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| 88 | this.parser.encodePacket(packet, this.supportsBinary, send);
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| 89 | }
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| 90 | }
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| 91 | /**
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| 92 | * Closes the transport.
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| 93 | *
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| 94 | * @api private
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| 95 | */
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| 96 | doClose(fn) {
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| 97 | debug("closing");
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| 98 | this.socket.close();
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| 99 | fn && fn();
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| 100 | }
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| 101 | }
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| 102 | exports.WebSocket = WebSocket;
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