mirror of https://github.com/jkjoy/sunpeiwen.git
402 lines
17 KiB
JavaScript
402 lines
17 KiB
JavaScript
/*
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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 { WorkboxError } from 'workbox-core/_private/WorkboxError.js';
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import { logger } from 'workbox-core/_private/logger.js';
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import { assert } from 'workbox-core/_private/assert.js';
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import { getFriendlyURL } from 'workbox-core/_private/getFriendlyURL.js';
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import { QueueStore } from './lib/QueueStore.js';
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import { StorableRequest } from './lib/StorableRequest.js';
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import './_version.js';
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const TAG_PREFIX = 'workbox-background-sync';
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const MAX_RETENTION_TIME = 60 * 24 * 7; // 7 days in minutes
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const queueNames = new Set();
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/**
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* Converts a QueueStore entry into the format exposed by Queue. This entails
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* converting the request data into a real request and omitting the `id` and
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* `queueName` properties.
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*
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* @param {UnidentifiedQueueStoreEntry} queueStoreEntry
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* @return {Queue}
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* @private
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*/
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const convertEntry = (queueStoreEntry) => {
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const queueEntry = {
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request: new StorableRequest(queueStoreEntry.requestData).toRequest(),
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timestamp: queueStoreEntry.timestamp,
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};
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if (queueStoreEntry.metadata) {
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queueEntry.metadata = queueStoreEntry.metadata;
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}
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return queueEntry;
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};
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/**
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* A class to manage storing failed requests in IndexedDB and retrying them
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* later. All parts of the storing and replaying process are observable via
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* callbacks.
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*
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* @memberof workbox-background-sync
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*/
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class Queue {
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/**
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* Creates an instance of Queue with the given options
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*
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* @param {string} name The unique name for this queue. This name must be
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* unique as it's used to register sync events and store requests
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* in IndexedDB specific to this instance. An error will be thrown if
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* a duplicate name is detected.
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* @param {Object} [options]
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* @param {Function} [options.onSync] A function that gets invoked whenever
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* the 'sync' event fires. The function is invoked with an object
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* containing the `queue` property (referencing this instance), and you
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* can use the callback to customize the replay behavior of the queue.
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* When not set the `replayRequests()` method is called.
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* Note: if the replay fails after a sync event, make sure you throw an
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* error, so the browser knows to retry the sync event later.
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* @param {number} [options.maxRetentionTime=7 days] The amount of time (in
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* minutes) a request may be retried. After this amount of time has
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* passed, the request will be deleted from the queue.
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* @param {boolean} [options.forceSyncFallback=false] If `true`, instead
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* of attempting to use background sync events, always attempt to replay
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* queued request at service worker startup. Most folks will not need
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* this, unless you explicitly target a runtime like Electron that
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* exposes the interfaces for background sync, but does not have a working
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* implementation.
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*/
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constructor(name, { forceSyncFallback, onSync, maxRetentionTime } = {}) {
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this._syncInProgress = false;
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this._requestsAddedDuringSync = false;
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// Ensure the store name is not already being used
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if (queueNames.has(name)) {
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throw new WorkboxError('duplicate-queue-name', { name });
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}
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else {
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queueNames.add(name);
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}
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this._name = name;
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this._onSync = onSync || this.replayRequests;
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this._maxRetentionTime = maxRetentionTime || MAX_RETENTION_TIME;
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this._forceSyncFallback = Boolean(forceSyncFallback);
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this._queueStore = new QueueStore(this._name);
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this._addSyncListener();
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}
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/**
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* @return {string}
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*/
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get name() {
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return this._name;
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}
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/**
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* Stores the passed request in IndexedDB (with its timestamp and any
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* metadata) at the end of the queue.
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*
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* @param {QueueEntry} entry
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* @param {Request} entry.request The request to store in the queue.
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* @param {Object} [entry.metadata] Any metadata you want associated with the
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* stored request. When requests are replayed you'll have access to this
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* metadata object in case you need to modify the request beforehand.
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* @param {number} [entry.timestamp] The timestamp (Epoch time in
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* milliseconds) when the request was first added to the queue. This is
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* used along with `maxRetentionTime` to remove outdated requests. In
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* general you don't need to set this value, as it's automatically set
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* for you (defaulting to `Date.now()`), but you can update it if you
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* don't want particular requests to expire.
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*/
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async pushRequest(entry) {
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if (process.env.NODE_ENV !== 'production') {
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assert.isType(entry, 'object', {
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moduleName: 'workbox-background-sync',
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className: 'Queue',
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funcName: 'pushRequest',
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paramName: 'entry',
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});
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assert.isInstance(entry.request, Request, {
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moduleName: 'workbox-background-sync',
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className: 'Queue',
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funcName: 'pushRequest',
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paramName: 'entry.request',
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});
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}
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await this._addRequest(entry, 'push');
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}
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/**
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* Stores the passed request in IndexedDB (with its timestamp and any
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* metadata) at the beginning of the queue.
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*
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* @param {QueueEntry} entry
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* @param {Request} entry.request The request to store in the queue.
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* @param {Object} [entry.metadata] Any metadata you want associated with the
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* stored request. When requests are replayed you'll have access to this
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* metadata object in case you need to modify the request beforehand.
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* @param {number} [entry.timestamp] The timestamp (Epoch time in
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* milliseconds) when the request was first added to the queue. This is
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* used along with `maxRetentionTime` to remove outdated requests. In
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* general you don't need to set this value, as it's automatically set
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* for you (defaulting to `Date.now()`), but you can update it if you
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* don't want particular requests to expire.
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*/
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async unshiftRequest(entry) {
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if (process.env.NODE_ENV !== 'production') {
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assert.isType(entry, 'object', {
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moduleName: 'workbox-background-sync',
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className: 'Queue',
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funcName: 'unshiftRequest',
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paramName: 'entry',
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});
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assert.isInstance(entry.request, Request, {
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moduleName: 'workbox-background-sync',
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className: 'Queue',
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funcName: 'unshiftRequest',
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paramName: 'entry.request',
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});
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}
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await this._addRequest(entry, 'unshift');
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}
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/**
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* Removes and returns the last request in the queue (along with its
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* timestamp and any metadata). The returned object takes the form:
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* `{request, timestamp, metadata}`.
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*
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* @return {Promise<QueueEntry | undefined>}
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*/
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async popRequest() {
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return this._removeRequest('pop');
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}
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/**
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* Removes and returns the first request in the queue (along with its
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* timestamp and any metadata). The returned object takes the form:
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* `{request, timestamp, metadata}`.
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*
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* @return {Promise<QueueEntry | undefined>}
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*/
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async shiftRequest() {
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return this._removeRequest('shift');
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}
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/**
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* Returns all the entries that have not expired (per `maxRetentionTime`).
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* Any expired entries are removed from the queue.
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*
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* @return {Promise<Array<QueueEntry>>}
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*/
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async getAll() {
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const allEntries = await this._queueStore.getAll();
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const now = Date.now();
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const unexpiredEntries = [];
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for (const entry of allEntries) {
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// Ignore requests older than maxRetentionTime. Call this function
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// recursively until an unexpired request is found.
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const maxRetentionTimeInMs = this._maxRetentionTime * 60 * 1000;
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if (now - entry.timestamp > maxRetentionTimeInMs) {
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await this._queueStore.deleteEntry(entry.id);
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}
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else {
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unexpiredEntries.push(convertEntry(entry));
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}
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}
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return unexpiredEntries;
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}
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/**
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* Returns the number of entries present in the queue.
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* Note that expired entries (per `maxRetentionTime`) are also included in this count.
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*
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* @return {Promise<number>}
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*/
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async size() {
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return await this._queueStore.size();
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}
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/**
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* Adds the entry to the QueueStore and registers for a sync event.
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*
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* @param {Object} entry
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* @param {Request} entry.request
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* @param {Object} [entry.metadata]
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* @param {number} [entry.timestamp=Date.now()]
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* @param {string} operation ('push' or 'unshift')
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* @private
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*/
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async _addRequest({ request, metadata, timestamp = Date.now() }, operation) {
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const storableRequest = await StorableRequest.fromRequest(request.clone());
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const entry = {
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requestData: storableRequest.toObject(),
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timestamp,
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};
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// Only include metadata if it's present.
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if (metadata) {
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entry.metadata = metadata;
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}
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switch (operation) {
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case 'push':
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await this._queueStore.pushEntry(entry);
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break;
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case 'unshift':
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await this._queueStore.unshiftEntry(entry);
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break;
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}
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if (process.env.NODE_ENV !== 'production') {
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logger.log(`Request for '${getFriendlyURL(request.url)}' has ` +
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`been added to background sync queue '${this._name}'.`);
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}
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// Don't register for a sync if we're in the middle of a sync. Instead,
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// we wait until the sync is complete and call register if
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// `this._requestsAddedDuringSync` is true.
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if (this._syncInProgress) {
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this._requestsAddedDuringSync = true;
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}
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else {
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await this.registerSync();
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}
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}
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/**
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* Removes and returns the first or last (depending on `operation`) entry
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* from the QueueStore that's not older than the `maxRetentionTime`.
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*
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* @param {string} operation ('pop' or 'shift')
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* @return {Object|undefined}
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* @private
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*/
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async _removeRequest(operation) {
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const now = Date.now();
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let entry;
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switch (operation) {
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case 'pop':
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entry = await this._queueStore.popEntry();
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break;
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case 'shift':
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entry = await this._queueStore.shiftEntry();
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break;
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}
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if (entry) {
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// Ignore requests older than maxRetentionTime. Call this function
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// recursively until an unexpired request is found.
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const maxRetentionTimeInMs = this._maxRetentionTime * 60 * 1000;
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if (now - entry.timestamp > maxRetentionTimeInMs) {
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return this._removeRequest(operation);
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}
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return convertEntry(entry);
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}
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else {
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return undefined;
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}
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}
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/**
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* Loops through each request in the queue and attempts to re-fetch it.
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* If any request fails to re-fetch, it's put back in the same position in
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* the queue (which registers a retry for the next sync event).
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*/
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async replayRequests() {
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let entry;
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while ((entry = await this.shiftRequest())) {
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try {
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await fetch(entry.request.clone());
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if (process.env.NODE_ENV !== 'production') {
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logger.log(`Request for '${getFriendlyURL(entry.request.url)}' ` +
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`has been replayed in queue '${this._name}'`);
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}
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}
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catch (error) {
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await this.unshiftRequest(entry);
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if (process.env.NODE_ENV !== 'production') {
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logger.log(`Request for '${getFriendlyURL(entry.request.url)}' ` +
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`failed to replay, putting it back in queue '${this._name}'`);
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}
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throw new WorkboxError('queue-replay-failed', { name: this._name });
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}
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}
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if (process.env.NODE_ENV !== 'production') {
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logger.log(`All requests in queue '${this.name}' have successfully ` +
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`replayed; the queue is now empty!`);
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}
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}
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/**
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* Registers a sync event with a tag unique to this instance.
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*/
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async registerSync() {
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// See https://github.com/GoogleChrome/workbox/issues/2393
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if ('sync' in self.registration && !this._forceSyncFallback) {
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try {
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await self.registration.sync.register(`${TAG_PREFIX}:${this._name}`);
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}
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catch (err) {
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// This means the registration failed for some reason, possibly due to
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// the user disabling it.
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if (process.env.NODE_ENV !== 'production') {
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logger.warn(`Unable to register sync event for '${this._name}'.`, err);
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}
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}
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}
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}
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/**
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* In sync-supporting browsers, this adds a listener for the sync event.
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* In non-sync-supporting browsers, or if _forceSyncFallback is true, this
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* will retry the queue on service worker startup.
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*
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* @private
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*/
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_addSyncListener() {
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// See https://github.com/GoogleChrome/workbox/issues/2393
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if ('sync' in self.registration && !this._forceSyncFallback) {
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self.addEventListener('sync', (event) => {
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if (event.tag === `${TAG_PREFIX}:${this._name}`) {
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if (process.env.NODE_ENV !== 'production') {
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logger.log(`Background sync for tag '${event.tag}' ` + `has been received`);
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}
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const syncComplete = async () => {
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this._syncInProgress = true;
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let syncError;
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try {
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await this._onSync({ queue: this });
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}
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catch (error) {
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if (error instanceof Error) {
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syncError = error;
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// Rethrow the error. Note: the logic in the finally clause
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// will run before this gets rethrown.
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throw syncError;
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}
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}
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finally {
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// New items may have been added to the queue during the sync,
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// so we need to register for a new sync if that's happened...
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// Unless there was an error during the sync, in which
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// case the browser will automatically retry later, as long
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// as `event.lastChance` is not true.
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if (this._requestsAddedDuringSync &&
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!(syncError && !event.lastChance)) {
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await this.registerSync();
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}
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this._syncInProgress = false;
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this._requestsAddedDuringSync = false;
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}
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};
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event.waitUntil(syncComplete());
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}
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});
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}
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else {
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if (process.env.NODE_ENV !== 'production') {
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logger.log(`Background sync replaying without background sync event`);
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}
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// If the browser doesn't support background sync, or the developer has
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// opted-in to not using it, retry every time the service worker starts up
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// as a fallback.
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void this._onSync({ queue: this });
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}
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}
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/**
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* Returns the set of queue names. This is primarily used to reset the list
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* of queue names in tests.
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*
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* @return {Set<string>}
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*
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* @private
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*/
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static get _queueNames() {
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return queueNames;
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}
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}
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export { Queue };
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