/*! @license
* Shaka Player
* Copyright 2016 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
goog.provide('shaka.offline.indexeddb.StorageMechanism');
goog.require('goog.asserts');
goog.require('shaka.log');
goog.require('shaka.offline.StorageMuxer');
goog.require('shaka.offline.indexeddb.EmeSessionStorageCell');
goog.require('shaka.offline.indexeddb.V1StorageCell');
goog.require('shaka.offline.indexeddb.V2StorageCell');
goog.require('shaka.offline.indexeddb.V5StorageCell');
goog.require('shaka.util.Error');
goog.require('shaka.util.PublicPromise');
goog.require('shaka.util.Platform');
goog.require('shaka.util.Timer');
/**
* A storage mechanism to manage storage cells for an indexed db instance.
* The cells are just for interacting with the stores that are found in the
* database instance. The mechanism is responsible for creating new stores
* when opening the database. If the database is too old of a version, a
* cell will be added for the old stores but the cell won't support add
* operations. The mechanism will create the new versions of the stores and
* will allow add operations for those stores.
*
* @implements {shaka.extern.StorageMechanism}
*/
shaka.offline.indexeddb.StorageMechanism = class {
/** */
constructor() {
/** @private {IDBDatabase} */
this.db_ = null;
/** @private {shaka.extern.StorageCell} */
this.v1_ = null;
/** @private {shaka.extern.StorageCell} */
this.v2_ = null;
/** @private {shaka.extern.StorageCell} */
this.v3_ = null;
/** @private {shaka.extern.StorageCell} */
this.v5_ = null;
/** @private {shaka.extern.EmeSessionStorageCell} */
this.sessions_ = null;
}
/**
* @override
*/
init() {
const name = shaka.offline.indexeddb.StorageMechanism.DB_NAME;
const version = shaka.offline.indexeddb.StorageMechanism.VERSION;
const p = new shaka.util.PublicPromise();
// Add a timeout mechanism, for the (rare?) case where no callbacks are
// called at all, so that this method doesn't hang forever.
let timedOut = false;
const timeOutTimer = new shaka.util.Timer(() => {
timedOut = true;
p.reject(new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.STORAGE,
shaka.util.Error.Code.INDEXED_DB_INIT_TIMED_OUT));
});
timeOutTimer.tickAfter(5);
const open = window.indexedDB.open(name, version);
open.onsuccess = (event) => {
if (timedOut) {
// Too late, we have already given up on opening the storage mechanism.
return;
}
const db = open.result;
this.db_ = db;
this.v1_ = shaka.offline.indexeddb.StorageMechanism.createV1_(db);
this.v2_ = shaka.offline.indexeddb.StorageMechanism.createV2_(db);
this.v3_ = shaka.offline.indexeddb.StorageMechanism.createV3_(db);
// NOTE: V4 of the database was when we introduced a special table to
// store EME session IDs. It has no separate storage cell, so we skip to
// V5.
this.v5_ = shaka.offline.indexeddb.StorageMechanism.createV5_(db);
this.sessions_ =
shaka.offline.indexeddb.StorageMechanism.createEmeSessionCell_(db);
timeOutTimer.stop();
p.resolve();
};
open.onupgradeneeded = (event) => {
// Add object stores for the latest version only.
this.createStores_(open.result);
};
open.onerror = (event) => {
if (timedOut) {
// Too late, we have already given up on opening the storage mechanism.
return;
}
p.reject(new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.STORAGE,
shaka.util.Error.Code.INDEXED_DB_ERROR,
open.error));
timeOutTimer.stop();
// Firefox will raise an error on the main thread unless we stop it here.
event.preventDefault();
};
return p;
}
/**
* @override
*/
async destroy() {
if (this.v1_) {
await this.v1_.destroy();
}
if (this.v2_) {
await this.v2_.destroy();
}
if (this.v3_) {
await this.v3_.destroy();
}
if (this.v5_) {
await this.v5_.destroy();
}
if (this.sessions_) {
await this.sessions_.destroy();
}
// If we were never initialized, then |db_| will still be null.
if (this.db_) {
this.db_.close();
}
}
/**
* @override
*/
getCells() {
const map = new Map();
if (this.v1_) {
map.set('v1', this.v1_);
}
if (this.v2_) {
map.set('v2', this.v2_);
}
if (this.v3_) {
map.set('v3', this.v3_);
}
if (this.v5_) {
map.set('v5', this.v5_);
}
return map;
}
/**
* @override
*/
getEmeSessionCell() {
goog.asserts.assert(this.sessions_, 'Cannot be destroyed.');
return this.sessions_;
}
/**
* @override
*/
async erase() {
// Not all cells may have been created, so only destroy the ones that
// were created.
if (this.v1_) {
await this.v1_.destroy();
}
if (this.v2_) {
await this.v2_.destroy();
}
if (this.v3_) {
await this.v3_.destroy();
}
if (this.v5_) {
await this.v5_.destroy();
}
// |db_| will only be null if the muxer was not initialized. We need to
// close the connection in order delete the database without it being
// blocked.
if (this.db_) {
this.db_.close();
}
await shaka.offline.indexeddb.StorageMechanism.deleteAll_();
// Reset before initializing.
this.db_ = null;
this.v1_ = null;
this.v2_ = null;
this.v3_ = null;
this.v5_ = null;
await this.init();
}
/**
* @param {!IDBDatabase} db
* @return {shaka.extern.StorageCell}
* @private
*/
static createV1_(db) {
const StorageMechanism = shaka.offline.indexeddb.StorageMechanism;
const segmentStore = StorageMechanism.V1_SEGMENT_STORE;
const manifestStore = StorageMechanism.V1_MANIFEST_STORE;
const stores = db.objectStoreNames;
if (stores.contains(manifestStore) && stores.contains(segmentStore)) {
shaka.log.debug('Mounting v1 idb storage cell');
return new shaka.offline.indexeddb.V1StorageCell(
db,
segmentStore,
manifestStore);
}
return null;
}
/**
* @param {!IDBDatabase} db
* @return {shaka.extern.StorageCell}
* @private
*/
static createV2_(db) {
const StorageMechanism = shaka.offline.indexeddb.StorageMechanism;
const segmentStore = StorageMechanism.V2_SEGMENT_STORE;
const manifestStore = StorageMechanism.V2_MANIFEST_STORE;
const stores = db.objectStoreNames;
if (stores.contains(manifestStore) && stores.contains(segmentStore)) {
shaka.log.debug('Mounting v2 idb storage cell');
return new shaka.offline.indexeddb.V2StorageCell(
db,
segmentStore,
manifestStore);
}
return null;
}
/**
* @param {!IDBDatabase} db
* @return {shaka.extern.StorageCell}
* @private
*/
static createV3_(db) {
const StorageMechanism = shaka.offline.indexeddb.StorageMechanism;
const segmentStore = StorageMechanism.V3_SEGMENT_STORE;
const manifestStore = StorageMechanism.V3_MANIFEST_STORE;
const stores = db.objectStoreNames;
if (stores.contains(manifestStore) && stores.contains(segmentStore)) {
shaka.log.debug('Mounting v3 idb storage cell');
// Version 3 uses the same structure as version 2, so we can use the same
// cells but it can support new entries.
return new shaka.offline.indexeddb.V2StorageCell(
db,
segmentStore,
manifestStore);
}
return null;
}
/**
* @param {!IDBDatabase} db
* @return {shaka.extern.StorageCell}
* @private
*/
static createV5_(db) {
const StorageMechanism = shaka.offline.indexeddb.StorageMechanism;
const segmentStore = StorageMechanism.V5_SEGMENT_STORE;
const manifestStore = StorageMechanism.V5_MANIFEST_STORE;
const stores = db.objectStoreNames;
if (stores.contains(manifestStore) && stores.contains(segmentStore)) {
shaka.log.debug('Mounting v5 idb storage cell');
return new shaka.offline.indexeddb.V5StorageCell(
db,
segmentStore,
manifestStore);
}
return null;
}
/**
* @param {!IDBDatabase} db
* @return {shaka.extern.EmeSessionStorageCell}
* @private
*/
static createEmeSessionCell_(db) {
const StorageMechanism = shaka.offline.indexeddb.StorageMechanism;
const store = StorageMechanism.SESSION_ID_STORE;
if (db.objectStoreNames.contains(store)) {
shaka.log.debug('Mounting session ID idb storage cell');
return new shaka.offline.indexeddb.EmeSessionStorageCell(db, store);
}
return null;
}
/**
* @param {!IDBDatabase} db
* @private
*/
createStores_(db) {
const storeNames = [
shaka.offline.indexeddb.StorageMechanism.V5_SEGMENT_STORE,
shaka.offline.indexeddb.StorageMechanism.V5_MANIFEST_STORE,
shaka.offline.indexeddb.StorageMechanism.SESSION_ID_STORE,
];
for (const name of storeNames) {
if (!db.objectStoreNames.contains(name)) {
db.createObjectStore(name, {autoIncrement: true});
}
}
}
/**
* Delete the indexed db instance so that all stores are deleted and cleared.
* This will force the database to a like-new state next time it opens.
*
* @return {!Promise}
* @private
*/
static deleteAll_() {
const name = shaka.offline.indexeddb.StorageMechanism.DB_NAME;
const p = new shaka.util.PublicPromise();
const del = window.indexedDB.deleteDatabase(name);
del.onblocked = (event) => {
shaka.log.warning('Deleting', name, 'is being blocked', event);
};
del.onsuccess = (event) => {
p.resolve();
};
del.onerror = (event) => {
p.reject(new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.STORAGE,
shaka.util.Error.Code.INDEXED_DB_ERROR,
del.error));
// Firefox will raise an error on the main thread unless we stop it here.
event.preventDefault();
};
return p;
}
};
/** @const {string} */
shaka.offline.indexeddb.StorageMechanism.DB_NAME = 'shaka_offline_db';
/** @const {number} */
shaka.offline.indexeddb.StorageMechanism.VERSION = 5;
/** @const {string} */
shaka.offline.indexeddb.StorageMechanism.V1_SEGMENT_STORE = 'segment';
/** @const {string} */
shaka.offline.indexeddb.StorageMechanism.V2_SEGMENT_STORE = 'segment-v2';
/** @const {string} */
shaka.offline.indexeddb.StorageMechanism.V3_SEGMENT_STORE = 'segment-v3';
/** @const {string} */
shaka.offline.indexeddb.StorageMechanism.V5_SEGMENT_STORE = 'segment-v5';
/** @const {string} */
shaka.offline.indexeddb.StorageMechanism.V1_MANIFEST_STORE = 'manifest';
/** @const {string} */
shaka.offline.indexeddb.StorageMechanism.V2_MANIFEST_STORE = 'manifest-v2';
/** @const {string} */
shaka.offline.indexeddb.StorageMechanism.V3_MANIFEST_STORE = 'manifest-v3';
/** @const {string} */
shaka.offline.indexeddb.StorageMechanism.V5_MANIFEST_STORE = 'manifest-v5';
/** @const {string} */
shaka.offline.indexeddb.StorageMechanism.SESSION_ID_STORE = 'session-ids';
// Since this may be called before the polyfills remove indexeddb support from
// some platforms (looking at you Chromecast), we need to check for support
// when we create the mechanism.
//
// Thankfully the storage muxer api allows us to return a null mechanism
// to indicate that the mechanism is not supported on this platform.
shaka.offline.StorageMuxer.register(
'idb',
() => {
// Offline storage is not supported on the Chromecast or Xbox One
// platforms.
if (shaka.util.Platform.isChromecast() ||
shaka.util.Platform.isXboxOne()) {
return null;
}
// Offline storage requires the IndexedDB API.
if (!window.indexedDB) {
return null;
}
return new shaka.offline.indexeddb.StorageMechanism();
});