hexo/node_modules/workbox-strategies/CacheOnly.js

62 lines
2.2 KiB
JavaScript

/*
Copyright 2018 Google LLC
Use of this source code is governed by an MIT-style
license that can be found in the LICENSE file or at
https://opensource.org/licenses/MIT.
*/
import { assert } from 'workbox-core/_private/assert.js';
import { logger } from 'workbox-core/_private/logger.js';
import { WorkboxError } from 'workbox-core/_private/WorkboxError.js';
import { Strategy } from './Strategy.js';
import { messages } from './utils/messages.js';
import './_version.js';
/**
* An implementation of a [cache-only](https://developer.chrome.com/docs/workbox/caching-strategies-overview/#cache-only)
* request strategy.
*
* This class is useful if you want to take advantage of any
* [Workbox plugins](https://developer.chrome.com/docs/workbox/using-plugins/).
*
* If there is no cache match, this will throw a `WorkboxError` exception.
*
* @extends workbox-strategies.Strategy
* @memberof workbox-strategies
*/
class CacheOnly extends Strategy {
/**
* @private
* @param {Request|string} request A request to run this strategy for.
* @param {workbox-strategies.StrategyHandler} handler The event that
* triggered the request.
* @return {Promise<Response>}
*/
async _handle(request, handler) {
if (process.env.NODE_ENV !== 'production') {
assert.isInstance(request, Request, {
moduleName: 'workbox-strategies',
className: this.constructor.name,
funcName: 'makeRequest',
paramName: 'request',
});
}
const response = await handler.cacheMatch(request);
if (process.env.NODE_ENV !== 'production') {
logger.groupCollapsed(messages.strategyStart(this.constructor.name, request));
if (response) {
logger.log(`Found a cached response in the '${this.cacheName}' ` + `cache.`);
messages.printFinalResponse(response);
}
else {
logger.log(`No response found in the '${this.cacheName}' cache.`);
}
logger.groupEnd();
}
if (!response) {
throw new WorkboxError('no-response', { url: request.url });
}
return response;
}
}
export { CacheOnly };