/* * Copyright (C) 2020-2021 Yomichan Authors * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <https://www.gnu.org/licenses/>. */ class Database { constructor() { this._db = null; this._isOpening = false; } // Public async open(databaseName, version, structure) { if (this._db !== null) { throw new Error('Database already open'); } if (this._isOpening) { throw new Error('Already opening'); } try { this._isOpening = true; this._db = await this._open(databaseName, version, (db, transaction, oldVersion) => { this._upgrade(db, transaction, oldVersion, structure); }); } finally { this._isOpening = false; } } close() { if (this._db === null) { throw new Error('Database is not open'); } this._db.close(); this._db = null; } isOpening() { return this._isOpening; } isOpen() { return this._db !== null; } transaction(storeNames, mode) { if (this._db === null) { throw new Error(this._isOpening ? 'Database not ready' : 'Database not open'); } return this._db.transaction(storeNames, mode); } bulkAdd(objectStoreName, items, start, count) { return new Promise((resolve, reject) => { if (start + count > items.length) { count = items.length - start; } if (count <= 0) { resolve(); return; } const end = start + count; let completedCount = 0; const onError = (e) => reject(e.target.error); const onSuccess = () => { if (++completedCount >= count) { resolve(); } }; const transaction = this.transaction([objectStoreName], 'readwrite'); const objectStore = transaction.objectStore(objectStoreName); for (let i = start; i < end; ++i) { const request = objectStore.add(items[i]); request.onerror = onError; request.onsuccess = onSuccess; } }); } getAll(objectStoreOrIndex, query, resolve, reject) { if (typeof objectStoreOrIndex.getAll === 'function') { this._getAllFast(objectStoreOrIndex, query, resolve, reject); } else { this._getAllUsingCursor(objectStoreOrIndex, query, resolve, reject); } } getAllKeys(objectStoreOrIndex, query, resolve, reject) { if (typeof objectStoreOrIndex.getAll === 'function') { this._getAllKeysFast(objectStoreOrIndex, query, resolve, reject); } else { this._getAllKeysUsingCursor(objectStoreOrIndex, query, resolve, reject); } } find(objectStoreName, indexName, query, predicate=null, defaultValue) { return new Promise((resolve, reject) => { const transaction = this.transaction([objectStoreName], 'readonly'); const objectStore = transaction.objectStore(objectStoreName); const objectStoreOrIndex = indexName !== null ? objectStore.index(indexName) : objectStore; const request = objectStoreOrIndex.openCursor(query, 'next'); request.onerror = (e) => reject(e.target.error); request.onsuccess = (e) => { const cursor = e.target.result; if (cursor) { const value = cursor.value; if (typeof predicate !== 'function' || predicate(value)) { resolve(value); } else { cursor.continue(); } } else { resolve(defaultValue); } }; }); } bulkCount(targets, resolve, reject) { const targetCount = targets.length; if (targetCount <= 0) { resolve(); return; } let completedCount = 0; const results = new Array(targetCount).fill(null); const onError = (e) => reject(e.target.error); const onSuccess = (e, index) => { const count = e.target.result; results[index] = count; if (++completedCount >= targetCount) { resolve(results); } }; for (let i = 0; i < targetCount; ++i) { const index = i; const [objectStoreOrIndex, query] = targets[i]; const request = objectStoreOrIndex.count(query); request.onerror = onError; request.onsuccess = (e) => onSuccess(e, index); } } delete(objectStoreName, key) { return new Promise((resolve, reject) => { const transaction = this.transaction([objectStoreName], 'readwrite'); const objectStore = transaction.objectStore(objectStoreName); const request = objectStore.delete(key); request.onerror = (e) => reject(e.target.error); request.onsuccess = () => resolve(); }); } bulkDelete(objectStoreName, indexName, query, filterKeys=null, onProgress=null) { return new Promise((resolve, reject) => { const transaction = this.transaction([objectStoreName], 'readwrite'); const objectStore = transaction.objectStore(objectStoreName); const objectStoreOrIndex = indexName !== null ? objectStore.index(indexName) : objectStore; const onGetKeys = (keys) => { try { if (typeof filterKeys === 'function') { keys = filterKeys(keys); } this._bulkDeleteInternal(objectStore, keys, onProgress, resolve, reject); } catch (e) { reject(e); } }; this.getAllKeys(objectStoreOrIndex, query, onGetKeys, reject); }); } static deleteDatabase(databaseName) { return new Promise((resolve, reject) => { const request = indexedDB.deleteDatabase(databaseName); request.onerror = (e) => reject(e.target.error); request.onsuccess = () => resolve(); request.onblocked = () => reject(new Error('Database deletion blocked')); }); } // Private _open(name, version, onUpgradeNeeded) { return new Promise((resolve, reject) => { const request = indexedDB.open(name, version); request.onupgradeneeded = (event) => { try { request.transaction.onerror = (e) => reject(e.target.error); onUpgradeNeeded(request.result, request.transaction, event.oldVersion, event.newVersion); } catch (e) { reject(e); } }; request.onerror = (e) => reject(e.target.error); request.onsuccess = () => resolve(request.result); }); } _upgrade(db, transaction, oldVersion, upgrades) { for (const {version, stores} of upgrades) { if (oldVersion >= version) { continue; } for (const [objectStoreName, {primaryKey, indices}] of Object.entries(stores)) { const existingObjectStoreNames = transaction.objectStoreNames || db.objectStoreNames; const objectStore = ( this._listContains(existingObjectStoreNames, objectStoreName) ? transaction.objectStore(objectStoreName) : db.createObjectStore(objectStoreName, primaryKey) ); const existingIndexNames = objectStore.indexNames; for (const indexName of indices) { if (this._listContains(existingIndexNames, indexName)) { continue; } objectStore.createIndex(indexName, indexName, {}); } } } } _listContains(list, value) { for (let i = 0, ii = list.length; i < ii; ++i) { if (list[i] === value) { return true; } } return false; } _getAllFast(objectStoreOrIndex, query, resolve, reject) { const request = objectStoreOrIndex.getAll(query); request.onerror = (e) => reject(e.target.error); request.onsuccess = (e) => resolve(e.target.result); } _getAllUsingCursor(objectStoreOrIndex, query, resolve, reject) { const results = []; const request = objectStoreOrIndex.openCursor(query, 'next'); request.onerror = (e) => reject(e.target.error); request.onsuccess = (e) => { const cursor = e.target.result; if (cursor) { results.push(cursor.value); cursor.continue(); } else { resolve(results); } }; } _getAllKeysFast(objectStoreOrIndex, query, resolve, reject) { const request = objectStoreOrIndex.getAllKeys(query); request.onerror = (e) => reject(e.target.error); request.onsuccess = (e) => resolve(e.target.result); } _getAllKeysUsingCursor(objectStoreOrIndex, query, resolve, reject) { const results = []; const request = objectStoreOrIndex.openKeyCursor(query, 'next'); request.onerror = (e) => reject(e.target.error); request.onsuccess = (e) => { const cursor = e.target.result; if (cursor) { results.push(cursor.primaryKey); cursor.continue(); } else { resolve(results); } }; } _bulkDeleteInternal(objectStore, keys, onProgress, resolve, reject) { const count = keys.length; if (count === 0) { resolve(); return; } let completedCount = 0; const hasProgress = (typeof onProgress === 'function'); const onError = (e) => reject(e.target.error); const onSuccess = () => { ++completedCount; if (hasProgress) { try { onProgress(completedCount, count); } catch (e) { // NOP } } if (completedCount >= count) { resolve(); } }; for (const key of keys) { const request = objectStore.delete(key); request.onerror = onError; request.onsuccess = onSuccess; } } }