51 lines
2.0 KiB
JavaScript
51 lines
2.0 KiB
JavaScript
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var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
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function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
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return new (P || (P = Promise))(function (resolve, reject) {
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function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
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function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
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function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
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step((generator = generator.apply(thisArg, _arguments || [])).next());
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});
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};
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import EventEmitter from 'eventemitter3';
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import { buildPath } from './utils';
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export class Downloader extends EventEmitter {
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constructor(storage, queue, basePath = '') {
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super();
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this.storage = storage;
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this.queue = queue;
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this.basePath = basePath;
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}
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setBasePath(path) {
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this.basePath = this.basePath;
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}
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download() {
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return __awaiter(this, void 0, void 0, function* () {
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const downloaded = new Map();
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let numDownloaded = 0;
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while (this.queue.length() > 0) {
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const path = this.queue.pop();
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const item = yield this.downloadItem(buildPath(this.basePath, path));
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downloaded.set(path, item);
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numDownloaded++;
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this.emit('download.progress', {
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downloaded: numDownloaded,
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remaining: this.queue.length()
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});
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}
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return downloaded;
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});
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}
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downloadItem(path) {
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return __awaiter(this, void 0, void 0, function* () {
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const inCache = yield this.storage.get(path);
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if (inCache) {
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return inCache;
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}
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const response = yield fetch(path);
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this.storage.add(path, response);
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return response;
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});
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}
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}
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