518 lines
21 KiB
JavaScript
518 lines
21 KiB
JavaScript
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/*
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Copyright 2020 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 { cacheMatchIgnoreParams } from 'workbox-core/_private/cacheMatchIgnoreParams.js';
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import { Deferred } from 'workbox-core/_private/Deferred.js';
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import { executeQuotaErrorCallbacks } from 'workbox-core/_private/executeQuotaErrorCallbacks.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 { timeout } from 'workbox-core/_private/timeout.js';
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import { WorkboxError } from 'workbox-core/_private/WorkboxError.js';
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import './_version.js';
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function toRequest(input) {
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return typeof input === 'string' ? new Request(input) : input;
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}
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/**
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* A class created every time a Strategy instance instance calls
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* {@link workbox-strategies.Strategy~handle} or
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* {@link workbox-strategies.Strategy~handleAll} that wraps all fetch and
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* cache actions around plugin callbacks and keeps track of when the strategy
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* is "done" (i.e. all added `event.waitUntil()` promises have resolved).
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*
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* @memberof workbox-strategies
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*/
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class StrategyHandler {
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/**
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* Creates a new instance associated with the passed strategy and event
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* that's handling the request.
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*
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* The constructor also initializes the state that will be passed to each of
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* the plugins handling this request.
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*
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* @param {workbox-strategies.Strategy} strategy
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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 {ExtendableEvent} options.event The event associated with the
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* request.
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* @param {URL} [options.url]
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* @param {*} [options.params] The return value from the
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* {@link workbox-routing~matchCallback} (if applicable).
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*/
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constructor(strategy, options) {
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this._cacheKeys = {};
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/**
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* The request the strategy is performing (passed to the strategy's
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* `handle()` or `handleAll()` method).
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* @name request
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* @instance
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* @type {Request}
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* @memberof workbox-strategies.StrategyHandler
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*/
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/**
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* The event associated with this request.
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* @name event
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* @instance
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* @type {ExtendableEvent}
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* @memberof workbox-strategies.StrategyHandler
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*/
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/**
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* A `URL` instance of `request.url` (if passed to the strategy's
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* `handle()` or `handleAll()` method).
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* Note: the `url` param will be present if the strategy was invoked
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* from a workbox `Route` object.
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* @name url
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* @instance
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* @type {URL|undefined}
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* @memberof workbox-strategies.StrategyHandler
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*/
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/**
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* A `param` value (if passed to the strategy's
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* `handle()` or `handleAll()` method).
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* Note: the `param` param will be present if the strategy was invoked
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* from a workbox `Route` object and the
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* {@link workbox-routing~matchCallback} returned
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* a truthy value (it will be that value).
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* @name params
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* @instance
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* @type {*|undefined}
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* @memberof workbox-strategies.StrategyHandler
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*/
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if (process.env.NODE_ENV !== 'production') {
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assert.isInstance(options.event, ExtendableEvent, {
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moduleName: 'workbox-strategies',
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className: 'StrategyHandler',
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funcName: 'constructor',
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paramName: 'options.event',
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});
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}
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Object.assign(this, options);
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this.event = options.event;
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this._strategy = strategy;
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this._handlerDeferred = new Deferred();
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this._extendLifetimePromises = [];
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// Copy the plugins list (since it's mutable on the strategy),
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// so any mutations don't affect this handler instance.
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this._plugins = [...strategy.plugins];
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this._pluginStateMap = new Map();
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for (const plugin of this._plugins) {
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this._pluginStateMap.set(plugin, {});
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}
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this.event.waitUntil(this._handlerDeferred.promise);
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}
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/**
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* Fetches a given request (and invokes any applicable plugin callback
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* methods) using the `fetchOptions` (for non-navigation requests) and
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* `plugins` defined on the `Strategy` object.
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*
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* The following plugin lifecycle methods are invoked when using this method:
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* - `requestWillFetch()`
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* - `fetchDidSucceed()`
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* - `fetchDidFail()`
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*
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* @param {Request|string} input The URL or request to fetch.
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* @return {Promise<Response>}
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*/
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async fetch(input) {
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const { event } = this;
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let request = toRequest(input);
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if (request.mode === 'navigate' &&
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event instanceof FetchEvent &&
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event.preloadResponse) {
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const possiblePreloadResponse = (await event.preloadResponse);
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if (possiblePreloadResponse) {
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if (process.env.NODE_ENV !== 'production') {
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logger.log(`Using a preloaded navigation response for ` +
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`'${getFriendlyURL(request.url)}'`);
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}
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return possiblePreloadResponse;
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}
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}
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// If there is a fetchDidFail plugin, we need to save a clone of the
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// original request before it's either modified by a requestWillFetch
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// plugin or before the original request's body is consumed via fetch().
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const originalRequest = this.hasCallback('fetchDidFail')
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? request.clone()
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: null;
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try {
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for (const cb of this.iterateCallbacks('requestWillFetch')) {
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request = await cb({ request: request.clone(), event });
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}
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}
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catch (err) {
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if (err instanceof Error) {
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throw new WorkboxError('plugin-error-request-will-fetch', {
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thrownErrorMessage: err.message,
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});
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}
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}
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// The request can be altered by plugins with `requestWillFetch` making
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// the original request (most likely from a `fetch` event) different
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// from the Request we make. Pass both to `fetchDidFail` to aid debugging.
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const pluginFilteredRequest = request.clone();
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try {
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let fetchResponse;
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// See https://github.com/GoogleChrome/workbox/issues/1796
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fetchResponse = await fetch(request, request.mode === 'navigate' ? undefined : this._strategy.fetchOptions);
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if (process.env.NODE_ENV !== 'production') {
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logger.debug(`Network request for ` +
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`'${getFriendlyURL(request.url)}' returned a response with ` +
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`status '${fetchResponse.status}'.`);
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}
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for (const callback of this.iterateCallbacks('fetchDidSucceed')) {
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fetchResponse = await callback({
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event,
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request: pluginFilteredRequest,
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response: fetchResponse,
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});
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}
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return fetchResponse;
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}
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catch (error) {
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if (process.env.NODE_ENV !== 'production') {
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logger.log(`Network request for ` +
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`'${getFriendlyURL(request.url)}' threw an error.`, error);
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}
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// `originalRequest` will only exist if a `fetchDidFail` callback
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// is being used (see above).
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if (originalRequest) {
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await this.runCallbacks('fetchDidFail', {
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error: error,
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event,
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originalRequest: originalRequest.clone(),
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request: pluginFilteredRequest.clone(),
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});
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}
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throw error;
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}
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}
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/**
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* Calls `this.fetch()` and (in the background) runs `this.cachePut()` on
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* the response generated by `this.fetch()`.
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*
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* The call to `this.cachePut()` automatically invokes `this.waitUntil()`,
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* so you do not have to manually call `waitUntil()` on the event.
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*
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* @param {Request|string} input The request or URL to fetch and cache.
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* @return {Promise<Response>}
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*/
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async fetchAndCachePut(input) {
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const response = await this.fetch(input);
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const responseClone = response.clone();
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void this.waitUntil(this.cachePut(input, responseClone));
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return response;
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}
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/**
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* Matches a request from the cache (and invokes any applicable plugin
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* callback methods) using the `cacheName`, `matchOptions`, and `plugins`
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* defined on the strategy object.
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*
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* The following plugin lifecycle methods are invoked when using this method:
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* - cacheKeyWillByUsed()
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* - cachedResponseWillByUsed()
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*
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* @param {Request|string} key The Request or URL to use as the cache key.
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* @return {Promise<Response|undefined>} A matching response, if found.
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*/
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async cacheMatch(key) {
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const request = toRequest(key);
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let cachedResponse;
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const { cacheName, matchOptions } = this._strategy;
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const effectiveRequest = await this.getCacheKey(request, 'read');
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const multiMatchOptions = Object.assign(Object.assign({}, matchOptions), { cacheName });
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cachedResponse = await caches.match(effectiveRequest, multiMatchOptions);
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if (process.env.NODE_ENV !== 'production') {
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if (cachedResponse) {
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logger.debug(`Found a cached response in '${cacheName}'.`);
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}
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else {
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logger.debug(`No cached response found in '${cacheName}'.`);
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}
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}
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for (const callback of this.iterateCallbacks('cachedResponseWillBeUsed')) {
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cachedResponse =
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(await callback({
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cacheName,
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matchOptions,
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cachedResponse,
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request: effectiveRequest,
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event: this.event,
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})) || undefined;
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}
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return cachedResponse;
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}
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/**
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* Puts a request/response pair in the cache (and invokes any applicable
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* plugin callback methods) using the `cacheName` and `plugins` defined on
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* the strategy object.
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*
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* The following plugin lifecycle methods are invoked when using this method:
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* - cacheKeyWillByUsed()
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* - cacheWillUpdate()
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* - cacheDidUpdate()
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*
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* @param {Request|string} key The request or URL to use as the cache key.
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* @param {Response} response The response to cache.
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* @return {Promise<boolean>} `false` if a cacheWillUpdate caused the response
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* not be cached, and `true` otherwise.
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*/
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async cachePut(key, response) {
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const request = toRequest(key);
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// Run in the next task to avoid blocking other cache reads.
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// https://github.com/w3c/ServiceWorker/issues/1397
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await timeout(0);
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const effectiveRequest = await this.getCacheKey(request, 'write');
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if (process.env.NODE_ENV !== 'production') {
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if (effectiveRequest.method && effectiveRequest.method !== 'GET') {
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throw new WorkboxError('attempt-to-cache-non-get-request', {
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url: getFriendlyURL(effectiveRequest.url),
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method: effectiveRequest.method,
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});
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}
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// See https://github.com/GoogleChrome/workbox/issues/2818
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const vary = response.headers.get('Vary');
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if (vary) {
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logger.debug(`The response for ${getFriendlyURL(effectiveRequest.url)} ` +
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`has a 'Vary: ${vary}' header. ` +
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`Consider setting the {ignoreVary: true} option on your strategy ` +
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`to ensure cache matching and deletion works as expected.`);
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}
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}
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if (!response) {
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if (process.env.NODE_ENV !== 'production') {
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logger.error(`Cannot cache non-existent response for ` +
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`'${getFriendlyURL(effectiveRequest.url)}'.`);
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}
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throw new WorkboxError('cache-put-with-no-response', {
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url: getFriendlyURL(effectiveRequest.url),
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});
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}
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const responseToCache = await this._ensureResponseSafeToCache(response);
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if (!responseToCache) {
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if (process.env.NODE_ENV !== 'production') {
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logger.debug(`Response '${getFriendlyURL(effectiveRequest.url)}' ` +
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`will not be cached.`, responseToCache);
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}
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return false;
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}
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const { cacheName, matchOptions } = this._strategy;
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const cache = await self.caches.open(cacheName);
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const hasCacheUpdateCallback = this.hasCallback('cacheDidUpdate');
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const oldResponse = hasCacheUpdateCallback
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? await cacheMatchIgnoreParams(
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// TODO(philipwalton): the `__WB_REVISION__` param is a precaching
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// feature. Consider into ways to only add this behavior if using
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// precaching.
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cache, effectiveRequest.clone(), ['__WB_REVISION__'], matchOptions)
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: null;
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if (process.env.NODE_ENV !== 'production') {
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logger.debug(`Updating the '${cacheName}' cache with a new Response ` +
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`for ${getFriendlyURL(effectiveRequest.url)}.`);
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}
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try {
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await cache.put(effectiveRequest, hasCacheUpdateCallback ? responseToCache.clone() : responseToCache);
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}
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catch (error) {
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if (error instanceof Error) {
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// See https://developer.mozilla.org/en-US/docs/Web/API/DOMException#exception-QuotaExceededError
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if (error.name === 'QuotaExceededError') {
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await executeQuotaErrorCallbacks();
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}
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throw error;
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}
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}
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for (const callback of this.iterateCallbacks('cacheDidUpdate')) {
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await callback({
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cacheName,
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oldResponse,
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newResponse: responseToCache.clone(),
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request: effectiveRequest,
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event: this.event,
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});
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}
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return true;
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}
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/**
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* Checks the list of plugins for the `cacheKeyWillBeUsed` callback, and
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* executes any of those callbacks found in sequence. The final `Request`
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* object returned by the last plugin is treated as the cache key for cache
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* reads and/or writes. If no `cacheKeyWillBeUsed` plugin callbacks have
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* been registered, the passed request is returned unmodified
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*
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* @param {Request} request
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* @param {string} mode
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* @return {Promise<Request>}
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*/
|
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async getCacheKey(request, mode) {
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|
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const key = `${request.url} | ${mode}`;
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if (!this._cacheKeys[key]) {
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let effectiveRequest = request;
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for (const callback of this.iterateCallbacks('cacheKeyWillBeUsed')) {
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effectiveRequest = toRequest(await callback({
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mode,
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request: effectiveRequest,
|
||
|
|
event: this.event,
|
||
|
|
// params has a type any can't change right now.
|
||
|
|
params: this.params, // eslint-disable-line
|
||
|
|
}));
|
||
|
|
}
|
||
|
|
this._cacheKeys[key] = effectiveRequest;
|
||
|
|
}
|
||
|
|
return this._cacheKeys[key];
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Returns true if the strategy has at least one plugin with the given
|
||
|
|
* callback.
|
||
|
|
*
|
||
|
|
* @param {string} name The name of the callback to check for.
|
||
|
|
* @return {boolean}
|
||
|
|
*/
|
||
|
|
hasCallback(name) {
|
||
|
|
for (const plugin of this._strategy.plugins) {
|
||
|
|
if (name in plugin) {
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Runs all plugin callbacks matching the given name, in order, passing the
|
||
|
|
* given param object (merged ith the current plugin state) as the only
|
||
|
|
* argument.
|
||
|
|
*
|
||
|
|
* Note: since this method runs all plugins, it's not suitable for cases
|
||
|
|
* where the return value of a callback needs to be applied prior to calling
|
||
|
|
* the next callback. See
|
||
|
|
* {@link workbox-strategies.StrategyHandler#iterateCallbacks}
|
||
|
|
* below for how to handle that case.
|
||
|
|
*
|
||
|
|
* @param {string} name The name of the callback to run within each plugin.
|
||
|
|
* @param {Object} param The object to pass as the first (and only) param
|
||
|
|
* when executing each callback. This object will be merged with the
|
||
|
|
* current plugin state prior to callback execution.
|
||
|
|
*/
|
||
|
|
async runCallbacks(name, param) {
|
||
|
|
for (const callback of this.iterateCallbacks(name)) {
|
||
|
|
// TODO(philipwalton): not sure why `any` is needed. It seems like
|
||
|
|
// this should work with `as WorkboxPluginCallbackParam[C]`.
|
||
|
|
await callback(param);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Accepts a callback and returns an iterable of matching plugin callbacks,
|
||
|
|
* where each callback is wrapped with the current handler state (i.e. when
|
||
|
|
* you call each callback, whatever object parameter you pass it will
|
||
|
|
* be merged with the plugin's current state).
|
||
|
|
*
|
||
|
|
* @param {string} name The name fo the callback to run
|
||
|
|
* @return {Array<Function>}
|
||
|
|
*/
|
||
|
|
*iterateCallbacks(name) {
|
||
|
|
for (const plugin of this._strategy.plugins) {
|
||
|
|
if (typeof plugin[name] === 'function') {
|
||
|
|
const state = this._pluginStateMap.get(plugin);
|
||
|
|
const statefulCallback = (param) => {
|
||
|
|
const statefulParam = Object.assign(Object.assign({}, param), { state });
|
||
|
|
// TODO(philipwalton): not sure why `any` is needed. It seems like
|
||
|
|
// this should work with `as WorkboxPluginCallbackParam[C]`.
|
||
|
|
return plugin[name](statefulParam);
|
||
|
|
};
|
||
|
|
yield statefulCallback;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Adds a promise to the
|
||
|
|
* [extend lifetime promises]{@link https://w3c.github.io/ServiceWorker/#extendableevent-extend-lifetime-promises}
|
||
|
|
* of the event event associated with the request being handled (usually a
|
||
|
|
* `FetchEvent`).
|
||
|
|
*
|
||
|
|
* Note: you can await
|
||
|
|
* {@link workbox-strategies.StrategyHandler~doneWaiting}
|
||
|
|
* to know when all added promises have settled.
|
||
|
|
*
|
||
|
|
* @param {Promise} promise A promise to add to the extend lifetime promises
|
||
|
|
* of the event that triggered the request.
|
||
|
|
*/
|
||
|
|
waitUntil(promise) {
|
||
|
|
this._extendLifetimePromises.push(promise);
|
||
|
|
return promise;
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Returns a promise that resolves once all promises passed to
|
||
|
|
* {@link workbox-strategies.StrategyHandler~waitUntil}
|
||
|
|
* have settled.
|
||
|
|
*
|
||
|
|
* Note: any work done after `doneWaiting()` settles should be manually
|
||
|
|
* passed to an event's `waitUntil()` method (not this handler's
|
||
|
|
* `waitUntil()` method), otherwise the service worker thread my be killed
|
||
|
|
* prior to your work completing.
|
||
|
|
*/
|
||
|
|
async doneWaiting() {
|
||
|
|
let promise;
|
||
|
|
while ((promise = this._extendLifetimePromises.shift())) {
|
||
|
|
await promise;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* Stops running the strategy and immediately resolves any pending
|
||
|
|
* `waitUntil()` promises.
|
||
|
|
*/
|
||
|
|
destroy() {
|
||
|
|
this._handlerDeferred.resolve(null);
|
||
|
|
}
|
||
|
|
/**
|
||
|
|
* This method will call cacheWillUpdate on the available plugins (or use
|
||
|
|
* status === 200) to determine if the Response is safe and valid to cache.
|
||
|
|
*
|
||
|
|
* @param {Request} options.request
|
||
|
|
* @param {Response} options.response
|
||
|
|
* @return {Promise<Response|undefined>}
|
||
|
|
*
|
||
|
|
* @private
|
||
|
|
*/
|
||
|
|
async _ensureResponseSafeToCache(response) {
|
||
|
|
let responseToCache = response;
|
||
|
|
let pluginsUsed = false;
|
||
|
|
for (const callback of this.iterateCallbacks('cacheWillUpdate')) {
|
||
|
|
responseToCache =
|
||
|
|
(await callback({
|
||
|
|
request: this.request,
|
||
|
|
response: responseToCache,
|
||
|
|
event: this.event,
|
||
|
|
})) || undefined;
|
||
|
|
pluginsUsed = true;
|
||
|
|
if (!responseToCache) {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (!pluginsUsed) {
|
||
|
|
if (responseToCache && responseToCache.status !== 200) {
|
||
|
|
responseToCache = undefined;
|
||
|
|
}
|
||
|
|
if (process.env.NODE_ENV !== 'production') {
|
||
|
|
if (responseToCache) {
|
||
|
|
if (responseToCache.status !== 200) {
|
||
|
|
if (responseToCache.status === 0) {
|
||
|
|
logger.warn(`The response for '${this.request.url}' ` +
|
||
|
|
`is an opaque response. The caching strategy that you're ` +
|
||
|
|
`using will not cache opaque responses by default.`);
|
||
|
|
}
|
||
|
|
else {
|
||
|
|
logger.debug(`The response for '${this.request.url}' ` +
|
||
|
|
`returned a status code of '${response.status}' and won't ` +
|
||
|
|
`be cached as a result.`);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return responseToCache;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
export { StrategyHandler };
|