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93 lines
3.1 KiB
93 lines
3.1 KiB
"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 {EngineRequest} req |
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*/ |
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constructor(req) { |
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super(req); |
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this._doSend = (data) => { |
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this.socket.send(data, this._onSent); |
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}; |
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this._doSendLast = (data) => { |
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this.socket.send(data, this._onSentLast); |
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}; |
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this._onSent = (err) => { |
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if (err) { |
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this.onError("write error", err.stack); |
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} |
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}; |
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this._onSentLast = (err) => { |
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if (err) { |
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this.onError("write error", err.stack); |
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} |
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else { |
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this.emit("drain"); |
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this.writable = true; |
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this.emit("ready"); |
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} |
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}; |
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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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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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get handlesUpgrades() { |
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return true; |
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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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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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// @ts-expect-error use of untyped member |
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this.socket._sender.sendFrame(packet.options.wsPreEncodedFrame, isLast ? this._onSentLast : this._onSent); |
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} |
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else { |
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this.parser.encodePacket(packet, this.supportsBinary, isLast ? this._doSendLast : this._doSend); |
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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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// @ts-expect-error use of untyped member |
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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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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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