| 6 | const debug = debugModule("engine:ws"); |
| 7 | |
| 8 | export class WebSocket extends Transport { |
| 9 | perMessageDeflate?: boolean | PerMessageDeflateOptions; |
| 10 | private socket: WsWebSocket; |
| 11 | |
| 12 | /** |
| 13 | * WebSocket transport |
| 14 | * |
| 15 | * @param {EngineRequest} req |
| 16 | */ |
| 17 | constructor(req: EngineRequest) { |
| 18 | super(req); |
| 19 | this.socket = req.websocket; |
| 20 | this.socket.on("message", (data, isBinary) => { |
| 21 | const message = isBinary ? data : data.toString(); |
| 22 | debug('received "%s"', message); |
| 23 | super.onData(message); |
| 24 | }); |
| 25 | this.socket.once("close", this.onClose.bind(this)); |
| 26 | this.socket.on("error", this.onError.bind(this)); |
| 27 | this.writable = true; |
| 28 | this.perMessageDeflate = null; |
| 29 | } |
| 30 | |
| 31 | /** |
| 32 | * Transport name |
| 33 | */ |
| 34 | get name() { |
| 35 | return "websocket"; |
| 36 | } |
| 37 | |
| 38 | /** |
| 39 | * Advertise upgrade support. |
| 40 | */ |
| 41 | get handlesUpgrades() { |
| 42 | return true; |
| 43 | } |
| 44 | |
| 45 | send(packets: Packet[]) { |
| 46 | this.writable = false; |
| 47 | |
| 48 | for (let i = 0; i < packets.length; i++) { |
| 49 | const packet = packets[i]; |
| 50 | const isLast = i + 1 === packets.length; |
| 51 | |
| 52 | if (this._canSendPreEncodedFrame(packet)) { |
| 53 | // the WebSocket frame was computed with WebSocket.Sender.frame() |
| 54 | // see https://github.com/websockets/ws/issues/617#issuecomment-283002469 |
| 55 | // @ts-expect-error use of untyped member |
| 56 | this.socket._sender.sendFrame( |
| 57 | packet.options.wsPreEncodedFrame, |
| 58 | isLast ? this._onSentLast : this._onSent, |
| 59 | ); |
| 60 | } else { |
| 61 | this.parser.encodePacket( |
| 62 | packet, |
| 63 | this.supportsBinary, |
| 64 | isLast ? this._doSendLast : this._doSend, |
| 65 | ); |