this.workbox = this.workbox || {};
this.workbox.backgroundSync = (function (exports, WorkboxError_mjs, logger_mjs, assert_mjs, getFriendlyURL_mjs, DBWrapper_mjs) {
'use strict';
try {
self['workbox:background-sync:4.3.1'] && _();
} catch (e) {} // eslint-disable-line
/*
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.
*/
const DB_VERSION = 3;
const DB_NAME = 'workbox-background-sync';
const OBJECT_STORE_NAME = 'requests';
const INDEXED_PROP = 'queueName';
/**
* A class to manage storing requests from a Queue in IndexedbDB,
* indexed by their queue name for easier access.
*
* @private
*/
class QueueStore {
/**
* Associates this instance with a Queue instance, so entries added can be
* identified by their queue name.
*
* @param {string} queueName
* @private
*/
constructor(queueName) {
this._queueName = queueName;
this._db = new DBWrapper_mjs.DBWrapper(DB_NAME, DB_VERSION, {
onupgradeneeded: this._upgradeDb
});
}
/**
* Append an entry last in the queue.
*
* @param {Object} entry
* @param {Object} entry.requestData
* @param {number} [entry.timestamp]
* @param {Object} [entry.metadata]
* @private
*/
async pushEntry(entry) {
{
assert_mjs.assert.isType(entry, 'object', {
moduleName: 'workbox-background-sync',
className: 'QueueStore',
funcName: 'pushEntry',
paramName: 'entry'
});
assert_mjs.assert.isType(entry.requestData, 'object', {
moduleName: 'workbox-background-sync',
className: 'QueueStore',
funcName: 'pushEntry',
paramName: 'entry.requestData'
});
} // Don't specify an ID since one is automatically generated.
delete entry.id;
entry.queueName = this._queueName;
await this._db.add(OBJECT_STORE_NAME, entry);
}
/**
* Preppend an entry first in the queue.
*
* @param {Object} entry
* @param {Object} entry.requestData
* @param {number} [entry.timestamp]
* @param {Object} [entry.metadata]
* @private
*/
async unshiftEntry(entry) {
{
assert_mjs.assert.isType(entry, 'object', {
moduleName: 'workbox-background-sync',
className: 'QueueStore',
funcName: 'unshiftEntry',
paramName: 'entry'
});
assert_mjs.assert.isType(entry.requestData, 'object', {
moduleName: 'workbox-background-sync',
className: 'QueueStore',
funcName: 'unshiftEntry',
paramName: 'entry.requestData'
});
}
const [firstEntry] = await this._db.getAllMatching(OBJECT_STORE_NAME, {
count: 1
});
if (firstEntry) {
// Pick an ID one less than the lowest ID in the object store.
entry.id = firstEntry.id - 1;
} else {
// Otherwise let the auto-incrementor assign the ID.
delete entry.id;
}
entry.queueName = this._queueName;
await this._db.add(OBJECT_STORE_NAME, entry);
}
/**
* Removes and returns the last entry in the queue matching the `queueName`.
*
* @return {Promise<Object>}
* @private
*/
async popEntry() {
return this._removeEntry({
direction: 'prev'
});
}
/**
* Removes and returns the first entry in the queue matching the `queueName`.
*
* @return {Promise<Object>}
* @private
*/
async shiftEntry() {
return this._removeEntry({
direction: 'next'
});
}
/**
* Returns all entries in the store matching the `queueName`.
*
* @param {Object} options See workbox.backgroundSync.Queue~getAll}
* @return {Promise<Array<Object>>}
* @private
*/
async getAll() {
return await this._db.getAllMatching(OBJECT_STORE_NAME, {
index: INDEXED_PROP,
query: IDBKeyRange.only(this._queueName)
});
}
/**
* Deletes the entry for the given ID.
*
* WARNING: this method does not ensure the deleted enry belongs to this
* queue (i.e. matches the `queueName`). But this limitation is acceptable
* as this class is not publicly exposed. An additional check would make
* this method slower than it needs to be.
*
* @private
* @param {number} id
*/
async deleteEntry(id) {
await this._db.delete(OBJECT_STORE_NAME, id);
}
/**
* Removes and returns the first or last entry in the queue (based on the
* `direction` argument) matching the `queueName`.
*
* @return {Promise<Object>}
* @private
*/
async _removeEntry({
direction
}) {
const [entry] = await this._db.getAllMatching(OBJECT_STORE_NAME, {
direction,
index: INDEXED_PROP,
query: IDBKeyRange.only(this._queueName),
count: 1
});
if (entry) {
await this.deleteEntry(entry.id);
return entry;
}
}
/**
* Upgrades the database given an `upgradeneeded` event.
*
* @param {Event} event
* @private
*/
_upgradeDb(event) {
const db = event.target.result;
if (event.oldVersion > 0 && event.oldVersion < DB_VERSION) {
if (db.objectStoreNames.contains(OBJECT_STORE_NAME)) {
db.deleteObjectStore(OBJECT_STORE_NAME);
}
}
const objStore = db.createObjectStore(OBJECT_STORE_NAME, {
autoIncrement: true,
keyPath: 'id'
});
objStore.createIndex(INDEXED_PROP, INDEXED_PROP, {
unique: false
});
}
}
/*
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.
*/
const serializableProperties = ['method', 'referrer', 'referrerPolicy', 'mode', 'credentials', 'cache', 'redirect', 'integrity', 'keepalive'];
/**
* A class to make it easier to serialize and de-serialize requests so they
* can be stored in IndexedDB.
*
* @private
*/
class StorableRequest {
/**
* Converts a Request object to a plain object that can be structured
* cloned or JSON-stringified.
*
* @param {Request} request
* @return {Promise<StorableRequest>}
*
* @private
*/
static async fromRequest(request) {
const requestData = {
url: request.url,
headers: {}
}; // Set the body if present.
if (request.method !== 'GET') {
// Use ArrayBuffer to support non-text request bodies.
// NOTE: we can't use Blobs becuse Safari doesn't support storing
// Blobs in IndexedDB in some cases:
// https://github.com/dfahlander/Dexie.js/issues/618#issuecomment-398348457
requestData.body = await request.clone().arrayBuffer();
} // Convert the headers from an iterable to an object.
for (const [key, value] of request.headers.entries()) {
requestData.headers[key] = value;
} // Add all other serializable request properties
for (const prop of serializableProperties) {
if (request[prop] !== undefined) {
requestData[prop] = request[prop];
}
}
return new StorableRequest(requestData);
}
/**
* Accepts an object of request data that can be used to construct a
* `Request` but can also be stored in IndexedDB.
*
* @param {Object} requestData An object of request data that includes the
* `url` plus any relevant properties of
* [requestInit]{@link https://fetch.spec.whatwg.org/#requestinit}.
* @private
*/
constructor(requestData) {
{
assert_mjs.assert.isType(requestData, 'object', {
moduleName: 'workbox-background-sync',
className: 'StorableRequest',
funcName: 'constructor',
paramName: 'requestData'
});
assert_mjs.assert.isType(requestData.url, 'string', {
moduleName: 'workbox-background-sync',
className: 'StorableRequest',
funcName: 'constructor',
paramName: 'requestData.url'
});
} // If the request's mode is `navigate`, convert it to `same-origin` since
// navigation requests can't be constructed via script.
if (requestData.mode === 'navigate') {
requestData.mode = 'same-origin';
}
this._requestData = requestData;
}
/**
* Returns a deep clone of the instances `_requestData` object.
*
* @return {Object}
*
* @private
*/
toObject() {
const requestData = Object.assign({}, this._requestData);
requestData.headers = Object.assign({}, this._requestData.headers);
if (requestData.body) {
requestData.body = requestData.body.slice(0);
}
return requestData;
}
/**
* Converts this instance to a Request.
*
* @return {Request}
*
* @private
*/
toRequest() {
return new Request(this._requestData.url, this._requestData);
}
/**
* Creates and returns a deep clone of the instance.
*
* @return {StorableRequest}
*
* @private
*/
clone() {
return new StorableRequest(this.toObject());
}
}
/*
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.
*/
const TAG_PREFIX = 'workbox-background-sync';
const MAX_RETENTION_TIME = 60 * 24 * 7; // 7 days in minutes
const queueNames = new Set();
/**
* A class to manage storing failed requests in IndexedDB and retrying them
* later. All parts of the storing and replaying process are observable via
* callbacks.
*
* @memberof workbox.backgroundSync
*/
class Queue {
/**
* Creates an instance of Queue with the given options
*
* @param {string} name The unique name for this queue. This name must be
* unique as it's used to register sync events and store requests
* in IndexedDB specific to this instance. An error will be thrown if
* a duplicate name is detected.
* @param {Object} [options]
* @param {Function} [options.onSync] A function that gets invoked whenever
* the 'sync' event fires. The function is invoked with an object
* containing the `queue` property (referencing this instance), and you
* can use the callback to customize the replay behavior of the queue.
* When not set the `replayRequests()` method is called.
* Note: if the replay fails after a sync event, make sure you throw an
* error, so the browser knows to retry the sync event later.
* @param {number} [options.maxRetentionTime=7 days] The amount of time (in
* minutes) a request may be retried. After this amount of time has
* passed, the request will be deleted from the queue.
*/
constructor(name, {
onSync,
maxRetentionTime
} = {}) {
// Ensure the store name is not already being used
if (queueNames.has(name)) {
throw new WorkboxError_mjs.WorkboxError('duplicate-queue-name', {
name
});
} else {
queueNames.add(name);
}
this._name = name;
this._onSync = onSync || this.replayRequests;
this._maxRetentionTime = maxRetentionTime || MAX_RETENTION_TIME;
this._queueStore = new QueueStore(this._name);
this._addSyncListener();
}
/**
* @return {string}
*/
get name() {
return this._name;
}
/**
* Stores the passed request in IndexedDB (with its timestamp and any
* metadata) at the end of the queue.
*
* @param {Object} entry
* @param {Request} entry.request The request to store in the queue.
* @param {Object} [entry.metadata] Any metadata you want associated with the
* stored request. When requests are replayed you'll have access to this
* metadata object in case you need to modify the request beforehand.
* @param {number} [entry.timestamp] The timestamp (Epoch time in
* milliseconds) when the request was first added to the queue. This is
* used along with `maxRetentionTime` to remove outdated requests. In
* general you don't need to set this value, as it's automatically set
* for you (defaulting to `Date.now()`), but you can update it if you
* don't want particular requests to expire.
*/
async pushRequest(entry) {
{
assert_mjs.assert.isType(entry, 'object', {
moduleName: 'workbox-background-sync',
className: 'Queue',
funcName: 'pushRequest',
paramName: 'entry'
});
assert_mjs.assert.isInstance(entry.request, Request, {
moduleName: 'workbox-background-sync',
className: 'Queue',
funcName: 'pushRequest',
paramName: 'entry.request'
});
}
await this._addRequest(entry, 'push');
}
/**
* Stores the passed request in IndexedDB (with its timestamp and any
* metadata) at the beginning of the queue.
*
* @param {Object} entry
* @param {Request} entry.request The request to store in the queue.
* @param {Object} [entry.metadata] Any metadata you want associated with the
* stored request. When requests are replayed you'll have access to this
* metadata object in case you need to modify the request beforehand.
* @param {number} [entry.timestamp] The timestamp (Epoch time in
* milliseconds) when the request was first added to the queue. This is
* used along with `maxRetentionTime` to remove outdated requests. In
* general you don't need to set this value, as it's automatically set
* for you (defaulting to `Date.now()`), but you can update it if you
* don't want particular requests to expire.
*/
async unshiftRequest(entry) {
{
assert_mjs.assert.isType(entry, 'object', {
moduleName: 'workbox-background-sync',
className: 'Queue',
funcName: 'unshiftRequest',
paramName: 'entry'
});
assert_mjs.assert.isInstance(entry.request, Request, {
moduleName: 'workbox-background-sync',
className: 'Queue',
funcName: 'unshiftRequest',
paramName: 'entry.request'
});
}
await this._addRequest(entry, 'unshift');
}
/**
* Removes and returns the last request in the queue (along with its
* timestamp and any metadata). The returned object takes the form:
* `{request, timestamp, metadata}`.
*
* @return {Promise<Object>}
*/
async popRequest() {
return this._removeRequest('pop');
}
/**
* Removes and returns the first request in the queue (along with its
* timestamp and any metadata). The returned object takes the form:
* `{request, timestamp, metadata}`.
*
* @return {Promise<Object>}
*/
async shiftRequest() {
return this._removeRequest('shift');
}
/**
* Returns all the entries that have not expired (per `maxRetentionTime`).
* Any expired entries are removed from the queue.
*
* @return {Promise<Array<Object>>}
*/
async getAll() {
const allEntries = await this._queueStore.getAll();
const now = Date.now();
const unexpiredEntries = [];
for (const entry of allEntries) {
// Ignore requests older than maxRetentionTime. Call this function
// recursively until an unexpired request is found.
const maxRetentionTimeInMs = this._maxRetentionTime * 60 * 1000;
if (now - entry.timestamp > maxRetentionTimeInMs) {
await this._queueStore.deleteEntry(entry.id);
} else {
unexpiredEntries.push(convertEntry(entry));
}
}
return unexpiredEntries;
}
/**
* Adds the entry to the QueueStore and registers for a sync event.
*
* @param {Object} entry
* @param {Request} entry.request
* @param {Object} [entry.metadata]
* @param {number} [entry.timestamp=Date.now()]
* @param {string} operation ('push' or 'unshift')
* @private
*/
async _addRequest({
request,
metadata,
timestamp = Date.now()
}, operation) {
const storableRequest = await StorableRequest.fromRequest(request.clone());
const entry = {
requestData: storableRequest.toObject(),
timestamp
}; // Only include metadata if it's present.
if (metadata) {
entry.metadata = metadata;
}
await this._queueStore[`${operation}Entry`](entry);
{
logger_mjs.logger.log(`Request for '${getFriendlyURL_mjs.getFriendlyURL(request.url)}' has ` + `been added to background sync queue '${this._name}'.`);
} // Don't register for a sync if we're in the middle of a sync. Instead,
// we wait until the sync is complete and call register if
// `this._requestsAddedDuringSync` is true.
if (this._syncInProgress) {
this._requestsAddedDuringSync = true;
} else {
await this.registerSync();
}
}
/**
* Removes and returns the first or last (depending on `operation`) entry
* from the QueueStore that's not older than the `maxRetentionTime`.
*
* @param {string} operation ('pop' or 'shift')
* @return {Object|undefined}
* @private
*/
async _removeRequest(operation) {
const now = Date.now();
const entry = await this._queueStore[`${operation}Entry`]();
if (entry) {
// Ignore requests older than maxRetentionTime. Call this function
// recursively until an unexpired request is found.
const maxRetentionTimeInMs = this._maxRetentionTime * 60 * 1000;
if (now - entry.timestamp > maxRetentionTimeInMs) {
return this._removeRequest(operation);
}
return convertEntry(entry);
}
}
/**
* Loops through each request in the queue and attempts to re-fetch it.
* If any request fails to re-fetch, it's put back in the same position in
* the queue (which registers a retry for the next sync event).
*/
async replayRequests() {
let entry;
while (entry = await this.shiftRequest()) {
try {
await fetch(entry.request.clone());
{
logger_mjs.logger.log(`Request for '${getFriendlyURL_mjs.getFriendlyURL(entry.request.url)}'` + `has been replayed in queue '${this._name}'`);
}
} catch (error) {
await this.unshiftRequest(entry);
{
logger_mjs.logger.log(`Request for '${getFriendlyURL_mjs.getFriendlyURL(entry.request.url)}'` + `failed to replay, putting it back in queue '${this._name}'`);
}
throw new WorkboxError_mjs.WorkboxError('queue-replay-failed', {
name: this._name
});
}
}
{
logger_mjs.logger.log(`All requests in queue '${this.name}' have successfully ` + `replayed; the queue is now empty!`);
}
}
/**
* Registers a sync event with a tag unique to this instance.
*/
async registerSync() {
if ('sync' in registration) {
try {
await registration.sync.register(`${TAG_PREFIX}:${this._name}`);
} catch (err) {
// This means the registration failed for some reason, possibly due to
// the user disabling it.
{
logger_mjs.logger.warn(`Unable to register sync event for '${this._name}'.`, err);
}
}
}
}
/**
* In sync-supporting browsers, this adds a listener for the sync event.
* In non-sync-supporting browsers, this will retry the queue on service
* worker startup.
*
* @private
*/
_addSyncListener() {
if ('sync' in registration) {
self.addEventListener('sync', event => {
if (event.tag === `${TAG_PREFIX}:${this._name}`) {
{
logger_mjs.logger.log(`Background sync for tag '${event.tag}'` + `has been received`);
}
const syncComplete = async () => {
this._syncInProgress = true;
let syncError;
try {
await this._onSync({
queue: this
});
} catch (error) {
syncError = error; // Rethrow the error. Note: the logic in the finally clause
// will run before this gets rethrown.
throw syncError;
} finally {
// New items may have been added to the queue during the sync,
// so we need to register for a new sync if that's happened...
// Unless there was an error during the sync, in which
// case the browser will automatically retry later, as long
// as `event.lastChance` is not true.
if (this._requestsAddedDuringSync && !(syncError && !event.lastChance)) {
await this.registerSync();
}
this._syncInProgress = false;
this._requestsAddedDuringSync = false;
}
};
event.waitUntil(syncComplete());
}
});
} else {
{
logger_mjs.logger.log(`Background sync replaying without background sync event`);
} // If the browser doesn't support background sync, retry
// every time the service worker starts up as a fallback.
this._onSync({
queue: this
});
}
}
/**
* Returns the set of queue names. This is primarily used to reset the list
* of queue names in tests.
*
* @return {Set}
*
* @private
*/
static get _queueNames() {
return queueNames;
}
}
/**
* Converts a QueueStore entry into the format exposed by Queue. This entails
* converting the request data into a real request and omitting the `id` and
* `queueName` properties.
*
* @param {Object} queueStoreEntry
* @return {Object}
* @private
*/
const convertEntry = queueStoreEntry => {
const queueEntry = {
request: new StorableRequest(queueStoreEntry.requestData).toRequest(),
timestamp: queueStoreEntry.timestamp
};
if (queueStoreEntry.metadata) {
queueEntry.metadata = queueStoreEntry.metadata;
}
return queueEntry;
};
/*
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.
*/
/**
* A class implementing the `fetchDidFail` lifecycle callback. This makes it
* easier to add failed requests to a background sync Queue.
*
* @memberof workbox.backgroundSync
*/
class Plugin {
/**
* @param {...*} queueArgs Args to forward to the composed Queue instance.
* See the [Queue]{@link workbox.backgroundSync.Queue} documentation for
* parameter details.
*/
constructor(...queueArgs) {
this._queue = new Queue(...queueArgs);
this.fetchDidFail = this.fetchDidFail.bind(this);
}
/**
* @param {Object} options
* @param {Request} options.request
* @private
*/
async fetchDidFail({
request
}) {
await this._queue.pushRequest({
request
});
}
}
/*
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.
*/
exports.Queue = Queue;
exports.Plugin = Plugin;
return exports;
}({}, workbox.core._private, workbox.core._private, workbox.core._private, workbox.core._private, workbox.core._private));
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