NetworkOnly.js
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/*
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 { fetchWrapper } from 'workbox-core/_private/fetchWrapper.js';
import { logger } from 'workbox-core/_private/logger.js';
import { WorkboxError } from 'workbox-core/_private/WorkboxError.js';
import { messages } from './utils/messages.js';
import './_version.js';
/**
* An implementation of a
* [network-only]{@link https://developers.google.com/web/fundamentals/instant-and-offline/offline-cookbook/#network-only}
* request strategy.
*
* This class is useful if you want to take advantage of any
* [Workbox plugins]{@link https://developers.google.com/web/tools/workbox/guides/using-plugins}.
*
* If the network request fails, this will throw a `WorkboxError` exception.
*
* @memberof module:workbox-strategies
*/
class NetworkOnly {
/**
* @param {Object} options
* @param {string} options.cacheName Cache name to store and retrieve
* requests. Defaults to cache names provided by
* [workbox-core]{@link module:workbox-core.cacheNames}.
* @param {Array<Object>} options.plugins [Plugins]{@link https://developers.google.com/web/tools/workbox/guides/using-plugins}
* to use in conjunction with this caching strategy.
* @param {Object} options.fetchOptions Values passed along to the
* [`init`](https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/fetch#Parameters)
* of all fetch() requests made by this strategy.
*/
constructor(options = {}) {
this._plugins = options.plugins || [];
this._fetchOptions = options.fetchOptions;
}
/**
* This method will perform a request strategy and follows an API that
* will work with the
* [Workbox Router]{@link module:workbox-routing.Router}.
*
* @param {Object} options
* @param {Request|string} options.request The request to run this strategy for.
* @param {Event} [options.event] The event that triggered the request.
* @return {Promise<Response>}
*/
async handle({ event, request }) {
if (typeof request === 'string') {
request = new Request(request);
}
if (process.env.NODE_ENV !== 'production') {
assert.isInstance(request, Request, {
moduleName: 'workbox-strategies',
className: 'NetworkOnly',
funcName: 'handle',
paramName: 'request',
});
}
let error;
let response;
try {
response = await fetchWrapper.fetch({
request,
event,
fetchOptions: this._fetchOptions,
plugins: this._plugins,
});
}
catch (err) {
error = err;
}
if (process.env.NODE_ENV !== 'production') {
logger.groupCollapsed(messages.strategyStart('NetworkOnly', request));
if (response) {
logger.log(`Got response from network.`);
}
else {
logger.log(`Unable to get a response from the network.`);
}
messages.printFinalResponse(response);
logger.groupEnd();
}
if (!response) {
throw new WorkboxError('no-response', { url: request.url, error });
}
return response;
}
}
export { NetworkOnly };