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

PlayCanvas WebGL game engine

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

/**
 * @import { AppBase } from '../app-base.js'
 */ /**
 * Loads Bundle Assets.
 *
 * @ignore
 */ class BundleHandler extends ResourceHandler {
    /**
     * Create a new BundleHandler instance.
     *
     * @param {AppBase} app - The running {@link AppBase}.
     */ 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) {
                        Debug.error(`Bundle failed to load retrying (attempt ${retries}`);
                        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)=>{
                Debug.error(err);
                callback(err);
            });
        }).catch((err)=>{
            Debug.error(err);
            callback(err);
        });
    }
    /**
     * Open the bundle.
     *
     * @param {string} url - The URL of the resource to open.
     * @param {Bundle} bundle - Bundle to open.
     * @returns {Bundle} The bundle.
     */ open(url, bundle) {
        return bundle;
    }
}

export { BundleHandler };