mirror of
https://github.com/idanoo/GoScrobble.git
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253 lines
9.9 KiB
JavaScript
253 lines
9.9 KiB
JavaScript
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/*
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Copyright 2018 Google LLC
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Use of this source code is governed by an MIT-style
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license that can be found in the LICENSE file or at
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https://opensource.org/licenses/MIT.
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*/
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import { assert } from 'workbox-core/_private/assert.js';
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import { cacheNames } from 'workbox-core/_private/cacheNames.js';
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import { cacheWrapper } from 'workbox-core/_private/cacheWrapper.js';
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import { fetchWrapper } from 'workbox-core/_private/fetchWrapper.js';
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import { getFriendlyURL } from 'workbox-core/_private/getFriendlyURL.js';
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import { logger } from 'workbox-core/_private/logger.js';
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import { WorkboxError } from 'workbox-core/_private/WorkboxError.js';
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import { messages } from './utils/messages.js';
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import { cacheOkAndOpaquePlugin } from './plugins/cacheOkAndOpaquePlugin.js';
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import './_version.js';
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/**
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* An implementation of a
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* [network first]{@link https://developers.google.com/web/fundamentals/instant-and-offline/offline-cookbook/#network-falling-back-to-cache}
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* request strategy.
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*
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* By default, this strategy will cache responses with a 200 status code as
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* well as [opaque responses]{@link https://developers.google.com/web/tools/workbox/guides/handle-third-party-requests}.
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* Opaque responses are are cross-origin requests where the response doesn't
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* support [CORS]{@link https://enable-cors.org/}.
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*
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* If the network request fails, and there is no cache match, this will throw
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* a `WorkboxError` exception.
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*
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* @memberof module:workbox-strategies
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*/
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class NetworkFirst {
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/**
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* @param {Object} options
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* @param {string} options.cacheName Cache name to store and retrieve
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* requests. Defaults to cache names provided by
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* [workbox-core]{@link module:workbox-core.cacheNames}.
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* @param {Array<Object>} options.plugins [Plugins]{@link https://developers.google.com/web/tools/workbox/guides/using-plugins}
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* to use in conjunction with this caching strategy.
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* @param {Object} options.fetchOptions Values passed along to the
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* [`init`](https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/fetch#Parameters)
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* of all fetch() requests made by this strategy.
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* @param {Object} options.matchOptions [`CacheQueryOptions`](https://w3c.github.io/ServiceWorker/#dictdef-cachequeryoptions)
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* @param {number} options.networkTimeoutSeconds If set, any network requests
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* that fail to respond within the timeout will fallback to the cache.
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*
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* This option can be used to combat
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* "[lie-fi]{@link https://developers.google.com/web/fundamentals/performance/poor-connectivity/#lie-fi}"
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* scenarios.
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*/
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constructor(options = {}) {
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this._cacheName = cacheNames.getRuntimeName(options.cacheName);
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if (options.plugins) {
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const isUsingCacheWillUpdate = options.plugins.some((plugin) => !!plugin.cacheWillUpdate);
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this._plugins = isUsingCacheWillUpdate ?
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options.plugins : [cacheOkAndOpaquePlugin, ...options.plugins];
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}
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else {
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// No plugins passed in, use the default plugin.
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this._plugins = [cacheOkAndOpaquePlugin];
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}
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this._networkTimeoutSeconds = options.networkTimeoutSeconds || 0;
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if (process.env.NODE_ENV !== 'production') {
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if (this._networkTimeoutSeconds) {
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assert.isType(this._networkTimeoutSeconds, 'number', {
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moduleName: 'workbox-strategies',
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className: 'NetworkFirst',
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funcName: 'constructor',
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paramName: 'networkTimeoutSeconds',
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});
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}
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}
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this._fetchOptions = options.fetchOptions;
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this._matchOptions = options.matchOptions;
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}
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/**
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* This method will perform a request strategy and follows an API that
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* will work with the
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* [Workbox Router]{@link module:workbox-routing.Router}.
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*
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* @param {Object} options
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* @param {Request|string} options.request A request to run this strategy for.
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* @param {Event} [options.event] The event that triggered the request.
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* @return {Promise<Response>}
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*/
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async handle({ event, request }) {
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const logs = [];
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if (typeof request === 'string') {
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request = new Request(request);
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}
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if (process.env.NODE_ENV !== 'production') {
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assert.isInstance(request, Request, {
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moduleName: 'workbox-strategies',
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className: 'NetworkFirst',
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funcName: 'handle',
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paramName: 'makeRequest',
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});
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}
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const promises = [];
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let timeoutId;
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if (this._networkTimeoutSeconds) {
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const { id, promise } = this._getTimeoutPromise({ request, event, logs });
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timeoutId = id;
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promises.push(promise);
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}
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const networkPromise = this._getNetworkPromise({ timeoutId, request, event, logs });
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promises.push(networkPromise);
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// Promise.race() will resolve as soon as the first promise resolves.
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let response = await Promise.race(promises);
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// If Promise.race() resolved with null, it might be due to a network
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// timeout + a cache miss. If that were to happen, we'd rather wait until
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// the networkPromise resolves instead of returning null.
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// Note that it's fine to await an already-resolved promise, so we don't
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// have to check to see if it's still "in flight".
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if (!response) {
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response = await networkPromise;
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}
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if (process.env.NODE_ENV !== 'production') {
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logger.groupCollapsed(messages.strategyStart('NetworkFirst', request));
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for (const log of logs) {
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logger.log(log);
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}
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messages.printFinalResponse(response);
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logger.groupEnd();
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}
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if (!response) {
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throw new WorkboxError('no-response', { url: request.url });
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}
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return response;
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}
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/**
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* @param {Object} options
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* @param {Request} options.request
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* @param {Array} options.logs A reference to the logs array
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* @param {Event} [options.event]
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* @return {Promise<Response>}
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*
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* @private
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*/
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_getTimeoutPromise({ request, logs, event }) {
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let timeoutId;
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const timeoutPromise = new Promise((resolve) => {
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const onNetworkTimeout = async () => {
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if (process.env.NODE_ENV !== 'production') {
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logs.push(`Timing out the network response at ` +
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`${this._networkTimeoutSeconds} seconds.`);
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}
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resolve(await this._respondFromCache({ request, event }));
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};
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timeoutId = setTimeout(onNetworkTimeout, this._networkTimeoutSeconds * 1000);
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});
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return {
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promise: timeoutPromise,
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id: timeoutId,
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};
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}
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/**
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* @param {Object} options
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* @param {number|undefined} options.timeoutId
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* @param {Request} options.request
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* @param {Array} options.logs A reference to the logs Array.
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* @param {Event} [options.event]
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* @return {Promise<Response>}
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*
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* @private
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*/
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async _getNetworkPromise({ timeoutId, request, logs, event }) {
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let error;
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let response;
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try {
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response = await fetchWrapper.fetch({
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request,
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event,
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fetchOptions: this._fetchOptions,
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plugins: this._plugins,
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});
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}
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catch (err) {
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error = err;
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}
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if (timeoutId) {
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clearTimeout(timeoutId);
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}
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if (process.env.NODE_ENV !== 'production') {
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if (response) {
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logs.push(`Got response from network.`);
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}
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else {
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logs.push(`Unable to get a response from the network. Will respond ` +
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`with a cached response.`);
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}
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}
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if (error || !response) {
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response = await this._respondFromCache({ request, event });
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if (process.env.NODE_ENV !== 'production') {
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if (response) {
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logs.push(`Found a cached response in the '${this._cacheName}'` +
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` cache.`);
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}
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else {
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logs.push(`No response found in the '${this._cacheName}' cache.`);
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}
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}
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}
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else {
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// Keep the service worker alive while we put the request in the cache
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const responseClone = response.clone();
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const cachePut = cacheWrapper.put({
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cacheName: this._cacheName,
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request,
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response: responseClone,
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event,
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plugins: this._plugins,
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});
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if (event) {
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try {
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// The event has been responded to so we can keep the SW alive to
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// respond to the request
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event.waitUntil(cachePut);
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}
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catch (err) {
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if (process.env.NODE_ENV !== 'production') {
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logger.warn(`Unable to ensure service worker stays alive when ` +
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`updating cache for '${getFriendlyURL(request.url)}'.`);
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}
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}
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}
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}
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return response;
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}
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/**
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* Used if the network timeouts or fails to make the request.
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*
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* @param {Object} options
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* @param {Request} request The request to match in the cache
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* @param {Event} [options.event]
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* @return {Promise<Object>}
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*
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* @private
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*/
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_respondFromCache({ event, request }) {
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return cacheWrapper.match({
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cacheName: this._cacheName,
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request,
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event,
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matchOptions: this._matchOptions,
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plugins: this._plugins,
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});
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}
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}
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export { NetworkFirst };
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