hexo/node_modules/workbox-background-sync/lib/QueueDb.js

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2023-10-03 11:14:36 +08:00
/*
Copyright 2021 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 { openDB } from 'idb';
import '../_version.js';
const DB_VERSION = 3;
const DB_NAME = 'workbox-background-sync';
const REQUEST_OBJECT_STORE_NAME = 'requests';
const QUEUE_NAME_INDEX = 'queueName';
/**
* A class to interact directly an IndexedDB created specifically to save and
* retrieve QueueStoreEntries. This class encapsulates all the schema details
* to store the representation of a Queue.
*
* @private
*/
export class QueueDb {
constructor() {
this._db = null;
}
/**
* Add QueueStoreEntry to underlying db.
*
* @param {UnidentifiedQueueStoreEntry} entry
*/
async addEntry(entry) {
const db = await this.getDb();
const tx = db.transaction(REQUEST_OBJECT_STORE_NAME, 'readwrite', {
durability: 'relaxed',
});
await tx.store.add(entry);
await tx.done;
}
/**
* Returns the first entry id in the ObjectStore.
*
* @return {number | undefined}
*/
async getFirstEntryId() {
const db = await this.getDb();
const cursor = await db
.transaction(REQUEST_OBJECT_STORE_NAME)
.store.openCursor();
return cursor === null || cursor === void 0 ? void 0 : cursor.value.id;
}
/**
* Get all the entries filtered by index
*
* @param queueName
* @return {Promise<QueueStoreEntry[]>}
*/
async getAllEntriesByQueueName(queueName) {
const db = await this.getDb();
const results = await db.getAllFromIndex(REQUEST_OBJECT_STORE_NAME, QUEUE_NAME_INDEX, IDBKeyRange.only(queueName));
return results ? results : new Array();
}
/**
* Returns the number of entries filtered by index
*
* @param queueName
* @return {Promise<number>}
*/
async getEntryCountByQueueName(queueName) {
const db = await this.getDb();
return db.countFromIndex(REQUEST_OBJECT_STORE_NAME, QUEUE_NAME_INDEX, IDBKeyRange.only(queueName));
}
/**
* Deletes a single entry by id.
*
* @param {number} id the id of the entry to be deleted
*/
async deleteEntry(id) {
const db = await this.getDb();
await db.delete(REQUEST_OBJECT_STORE_NAME, id);
}
/**
*
* @param queueName
* @returns {Promise<QueueStoreEntry | undefined>}
*/
async getFirstEntryByQueueName(queueName) {
return await this.getEndEntryFromIndex(IDBKeyRange.only(queueName), 'next');
}
/**
*
* @param queueName
* @returns {Promise<QueueStoreEntry | undefined>}
*/
async getLastEntryByQueueName(queueName) {
return await this.getEndEntryFromIndex(IDBKeyRange.only(queueName), 'prev');
}
/**
* Returns either the first or the last entries, depending on direction.
* Filtered by index.
*
* @param {IDBCursorDirection} direction
* @param {IDBKeyRange} query
* @return {Promise<QueueStoreEntry | undefined>}
* @private
*/
async getEndEntryFromIndex(query, direction) {
const db = await this.getDb();
const cursor = await db
.transaction(REQUEST_OBJECT_STORE_NAME)
.store.index(QUEUE_NAME_INDEX)
.openCursor(query, direction);
return cursor === null || cursor === void 0 ? void 0 : cursor.value;
}
/**
* Returns an open connection to the database.
*
* @private
*/
async getDb() {
if (!this._db) {
this._db = await openDB(DB_NAME, DB_VERSION, {
upgrade: this._upgradeDb,
});
}
return this._db;
}
/**
* Upgrades QueueDB
*
* @param {IDBPDatabase<QueueDBSchema>} db
* @param {number} oldVersion
* @private
*/
_upgradeDb(db, oldVersion) {
if (oldVersion > 0 && oldVersion < DB_VERSION) {
if (db.objectStoreNames.contains(REQUEST_OBJECT_STORE_NAME)) {
db.deleteObjectStore(REQUEST_OBJECT_STORE_NAME);
}
}
const objStore = db.createObjectStore(REQUEST_OBJECT_STORE_NAME, {
autoIncrement: true,
keyPath: 'id',
});
objStore.createIndex(QUEUE_NAME_INDEX, QUEUE_NAME_INDEX, { unique: false });
}
}