You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 

98 lines
3.7 KiB

/*
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 { timeout } from 'workbox-core/_private/timeout.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
* [network-only](https://developer.chrome.com/docs/workbox/caching-strategies-overview/#network-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 the network request fails, this will throw a `WorkboxError` exception.
*
* @extends workbox-strategies.Strategy
* @memberof workbox-strategies
*/
class NetworkOnly extends Strategy {
/**
* @param {Object} [options]
* @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 [non-navigation](https://github.com/GoogleChrome/workbox/issues/1796)
* `fetch()` requests made by this strategy.
* @param {number} [options.networkTimeoutSeconds] If set, any network requests
* that fail to respond within the timeout will result in a network error.
*/
constructor(options = {}) {
super(options);
this._networkTimeoutSeconds = options.networkTimeoutSeconds || 0;
}
/**
* @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: '_handle',
paramName: 'request',
});
}
let error = undefined;
let response;
try {
const promises = [
handler.fetch(request),
];
if (this._networkTimeoutSeconds) {
const timeoutPromise = timeout(this._networkTimeoutSeconds * 1000);
promises.push(timeoutPromise);
}
response = await Promise.race(promises);
if (!response) {
throw new Error(`Timed out the network response after ` +
`${this._networkTimeoutSeconds} seconds.`);
}
}
catch (err) {
if (err instanceof Error) {
error = err;
}
}
if (process.env.NODE_ENV !== 'production') {
logger.groupCollapsed(messages.strategyStart(this.constructor.name, 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 };