shaka-player
Version:
DASH/EME video player library
277 lines (236 loc) • 7.5 kB
JavaScript
/*! @license
* Shaka Player
* Copyright 2016 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
goog.provide('shaka.offline.indexeddb.BaseStorageCell');
goog.require('shaka.offline.indexeddb.DBConnection');
goog.require('shaka.util.Error');
goog.requireType('shaka.offline.indexeddb.DBOperation');
/**
* indexeddb.StorageCellBase is a base class for all stores that use IndexedDB.
*
* @implements {shaka.extern.StorageCell}
*/
shaka.offline.indexeddb.BaseStorageCell = class {
/**
* @param {IDBDatabase} connection
* @param {string} segmentStore
* @param {string} manifestStore
*/
constructor(connection, segmentStore, manifestStore) {
/** @protected {!shaka.offline.indexeddb.DBConnection} */
this.connection_ = new shaka.offline.indexeddb.DBConnection(connection);
/** @protected {string} */
this.segmentStore_ = segmentStore;
/** @protected {string} */
this.manifestStore_ = manifestStore;
}
/** @override */
destroy() {
return this.connection_.destroy();
}
/** @override */
hasFixedKeySpace() {
// By default, all IDB stores are read-only. The latest one will need to
// override this default to be read-write.
return true;
}
/** @override */
addSegments(segments) {
// By default, reject all additions.
return this.rejectAdd(this.segmentStore_);
}
/** @override */
removeSegments(keys, onRemove) {
return this.remove_(this.segmentStore_, keys, onRemove);
}
/** @override */
async getSegments(keys) {
const rawSegments = await this.get_(this.segmentStore_, keys);
return rawSegments.map((s) => this.convertSegmentData(s));
}
/** @override */
addManifests(manifests) {
// By default, reject all additions.
return this.rejectAdd(this.manifestStore_);
}
/** @override */
updateManifest(key, manifest) {
// By default, reject all updates.
return this.rejectUpdate(this.manifestStore_);
}
/**
* @param {number} key
* @param {!shaka.extern.ManifestDB} manifest
* @return {!Promise}
* @protected
*/
updateManifestImplementation(key, manifest) {
const op = this.connection_.startReadWriteOperation(this.manifestStore_);
const store = op.store();
store.get(key).onsuccess = (e) => {
store.put(manifest, key);
};
return op.promise();
}
/** @override */
updateManifestExpiration(key, newExpiration) {
const op = this.connection_.startReadWriteOperation(this.manifestStore_);
const store = op.store();
store.get(key).onsuccess = (e) => {
const manifest = e.target.result;
// If we can't find the value, then there is nothing for us to update.
if (manifest) {
manifest.expiration = newExpiration;
store.put(manifest, key);
}
};
return op.promise();
}
/** @override */
removeManifests(keys, onRemove) {
return this.remove_(this.manifestStore_, keys, onRemove);
}
/** @override */
async getManifests(keys) {
const rawManifests = await this.get_(this.manifestStore_, keys);
return Promise.all(rawManifests.map((m) => this.convertManifest(m)));
}
/** @override */
async getAllManifests() {
/** @type {!shaka.offline.indexeddb.DBOperation} */
const op = this.connection_.startReadOnlyOperation(this.manifestStore_);
/** @type {!Map<number, shaka.extern.ManifestDB>} */
const values = new Map();
await op.forEachEntry(async (key, value) => {
const manifest = await this.convertManifest(value);
values.set(/** @type {number} */(key), manifest);
});
await op.promise();
return values;
}
/**
* @param {?} old
* @return {shaka.extern.SegmentDataDB}
* @protected
*/
convertSegmentData(old) {
// Conversion is specific to each subclass. By default, do nothing.
return /** @type {shaka.extern.SegmentDataDB} */(old);
}
/**
* @param {?} old
* @return {!Promise<shaka.extern.ManifestDB>}
* @protected
*/
convertManifest(old) {
// Conversion is specific to each subclass. By default, do nothing.
return Promise.resolve(/** @type {shaka.extern.ManifestDB} */(old));
}
/**
* @param {string} storeName
* @return {!Promise}
* @protected
*/
rejectAdd(storeName) {
return Promise.reject(new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.STORAGE,
shaka.util.Error.Code.NEW_KEY_OPERATION_NOT_SUPPORTED,
'Cannot add new value to ' + storeName));
}
/**
* @param {string} storeName
* @return {!Promise}
* @protected
*/
rejectUpdate(storeName) {
return Promise.reject(new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.STORAGE,
shaka.util.Error.Code.MODIFY_OPERATION_NOT_SUPPORTED,
'Cannot modify values in ' + storeName));
}
/**
* @param {string} storeName
* @param {!Array<T>} values
* @return {!Promise<!Array<number>>}
* @template T
* @protected
*/
async add(storeName, values) {
const op = this.connection_.startReadWriteOperation(storeName);
const store = op.store();
/** @type {!Array<number>} */
const keys = [];
// Write each segment out. When each request completes, the key will
// be in |request.result| as can be seen in
// https://w3c.github.io/IndexedDB/#key-generator-construct.
for (const value of values) {
const request = store.add(value);
request.onsuccess = (event) => {
const key = request.result;
keys.push(key);
};
}
// Wait until the operation completes or else |keys| will not be fully
// populated.
await op.promise();
return keys;
}
/**
* @param {string} storeName
* @param {!Array<number>} keys
* @param {function(number)} onRemove
* @return {!Promise}
* @private
*/
remove_(storeName, keys, onRemove) {
const op = this.connection_.startReadWriteOperation(storeName);
const store = op.store();
for (const key of keys) {
store.delete(key).onsuccess = () => onRemove(key);
}
return op.promise();
}
/**
* @param {string} storeName
* @param {!Array<number>} keys
* @return {!Promise<!Array<T>>}
* @template T
* @private
*/
async get_(storeName, keys) {
const op = this.connection_.startReadOnlyOperation(storeName);
const store = op.store();
const values = {};
/** @type {!Array<number>} */
const missing = [];
// Use a map to store the objects so that we can reorder the results to
// match the order of |keys|.
for (const key of keys) {
const request = store.get(key);
request.onsuccess = () => {
// Make sure a defined value was found. Indexeddb treats no-value found
// as a success with an undefined result.
if (request.result == undefined) {
missing.push(key);
}
values[key] = request.result;
};
}
// Wait until the operation completes or else values may be missing from
// |values|. Use the original key list to convert the map to a list so that
// the order will match.
await op.promise();
if (missing.length) {
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.STORAGE,
shaka.util.Error.Code.KEY_NOT_FOUND,
'Could not find values for ' + missing);
}
return keys.map((key) => values[key]);
}
};