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