@needle-tools/engine/lib/engine/engine_networking.transport.websocket.js

Needle Engine is a web-based runtime for 3D apps. It runs on your machine for development with great integrations into editors like Unity or Blender - and can be deployed onto any device! It is flexible, extensible and networking and XR are built-in.

/** Default transport that wraps the `websocket-ts` library */
export class WebsocketTransport {
    _url;
    _ws;
    onOpen = null;
    onClose = null;
    onError = null;
    onMessage = null;
    get url() { return this._ws?.url ?? this._url; }
    constructor(url) {
        this._url = url;
    }
    async start() {
        const pkg = await import('websocket-ts');
        // @ts-ignore
        const WebsocketBuilder = pkg.default?.WebsocketBuilder ?? pkg.WebsocketBuilder;
        const ExponentialBackoff = pkg.default?.ExponentialBackoff ?? pkg.ExponentialBackoff;
        const ws = new WebsocketBuilder(this._url)
            .withMaxRetries(10)
            .withBackoff(new ExponentialBackoff(2000, 4))
            .onOpen(() => { this._ws = ws; this.onOpen?.(); })
            .onClose(() => { this.onClose?.(); })
            .onError(() => { this.onError?.(new Error("Websocket connection failed")); })
            .onRetry(() => { console.log("Retry connecting to networking websocket"); })
            .build();
        ws.addEventListener(pkg.WebsocketEvent.message, (_, msg) => {
            this.onMessage?.(msg.data);
        });
    }
    send(data) {
        this._ws?.send(data);
    }
    close() {
        this._ws?.close();
        this._ws = undefined;
    }
}
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