playcanvas/build/playcanvas.prf/src/framework/handlers/bundle.js

PlayCanvas WebGL game engine

import { Bundle } from '../bundle/bundle.js';
import { Untar } from './untar.js';
import { ResourceHandler } from './handler.js';

class BundleHandler extends ResourceHandler {
		constructor(app){
				super(app, 'bundle');
				this._assets = app.assets;
		}
		_fetchRetries(url, options, retries = 0) {
				return new Promise((resolve, reject)=>{
						const tryFetch = ()=>{
								fetch(url, options).then(resolve).catch((err)=>{
										retries++;
										if (retries < this.maxRetries) {
												tryFetch();
										} else {
												reject(err);
										}
								});
						};
						tryFetch();
				});
		}
		load(url, callback) {
				if (typeof url === 'string') {
						url = {
								load: url,
								original: url
						};
				}
				this._fetchRetries(url.load, {
						mode: 'cors'
				}, this.maxRetries).then((res)=>{
						const bundle = new Bundle();
						callback(null, bundle);
						const untar = new Untar(res, this._assets.prefix);
						untar.on('file', (file)=>{
								bundle.addFile(file.name, file.data);
						});
						untar.on('done', ()=>{
								bundle.loaded = true;
						});
						untar.on('error', (err)=>{
								callback(err);
						});
				}).catch((err)=>{
						callback(err);
				});
		}
		open(url, bundle) {
				return bundle;
		}
}

export { BundleHandler };