475 lines
18 KiB
JavaScript
475 lines
18 KiB
JavaScript
(function (global, factory) {
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if (typeof define === "function" && define.amd) {
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define('webSQLStorage', ['module', 'exports', '../utils/isWebSQLValid', '../utils/serializer', '../utils/promise', '../utils/executeCallback', '../utils/normalizeKey', '../utils/getCallback'], factory);
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} else if (typeof exports !== "undefined") {
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factory(module, exports, require('../utils/isWebSQLValid'), require('../utils/serializer'), require('../utils/promise'), require('../utils/executeCallback'), require('../utils/normalizeKey'), require('../utils/getCallback'));
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} else {
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var mod = {
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exports: {}
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};
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factory(mod, mod.exports, global.isWebSQLValid, global.serializer, global.promise, global.executeCallback, global.normalizeKey, global.getCallback);
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global.webSQLStorage = mod.exports;
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}
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})(this, function (module, exports, _isWebSQLValid, _serializer, _promise, _executeCallback, _normalizeKey, _getCallback) {
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'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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var _isWebSQLValid2 = _interopRequireDefault(_isWebSQLValid);
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var _serializer2 = _interopRequireDefault(_serializer);
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var _promise2 = _interopRequireDefault(_promise);
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var _executeCallback2 = _interopRequireDefault(_executeCallback);
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var _normalizeKey2 = _interopRequireDefault(_normalizeKey);
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var _getCallback2 = _interopRequireDefault(_getCallback);
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function _interopRequireDefault(obj) {
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return obj && obj.__esModule ? obj : {
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default: obj
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};
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}
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/*
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* Includes code from:
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*
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* base64-arraybuffer
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* https://github.com/niklasvh/base64-arraybuffer
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*
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* Copyright (c) 2012 Niklas von Hertzen
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* Licensed under the MIT license.
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*/
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function createDbTable(t, dbInfo, callback, errorCallback) {
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t.executeSql('CREATE TABLE IF NOT EXISTS ' + dbInfo.storeName + ' ' + '(id INTEGER PRIMARY KEY, key unique, value)', [], callback, errorCallback);
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}
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// Open the WebSQL database (automatically creates one if one didn't
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// previously exist), using any options set in the config.
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function _initStorage(options) {
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var self = this;
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var dbInfo = {
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db: null
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};
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if (options) {
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for (var i in options) {
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dbInfo[i] = typeof options[i] !== 'string' ? options[i].toString() : options[i];
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}
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}
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var dbInfoPromise = new _promise2.default(function (resolve, reject) {
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// Open the database; the openDatabase API will automatically
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// create it for us if it doesn't exist.
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try {
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dbInfo.db = openDatabase(dbInfo.name, String(dbInfo.version), dbInfo.description, dbInfo.size);
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} catch (e) {
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return reject(e);
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}
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// Create our key/value table if it doesn't exist.
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dbInfo.db.transaction(function (t) {
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createDbTable(t, dbInfo, function () {
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self._dbInfo = dbInfo;
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resolve();
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}, function (t, error) {
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reject(error);
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});
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}, reject);
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});
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dbInfo.serializer = _serializer2.default;
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return dbInfoPromise;
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}
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function tryExecuteSql(t, dbInfo, sqlStatement, args, callback, errorCallback) {
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t.executeSql(sqlStatement, args, callback, function (t, error) {
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if (error.code === error.SYNTAX_ERR) {
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t.executeSql('SELECT name FROM sqlite_master ' + "WHERE type='table' AND name = ?", [dbInfo.storeName], function (t, results) {
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if (!results.rows.length) {
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// if the table is missing (was deleted)
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// re-create it table and retry
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createDbTable(t, dbInfo, function () {
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t.executeSql(sqlStatement, args, callback, errorCallback);
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}, errorCallback);
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} else {
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errorCallback(t, error);
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}
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}, errorCallback);
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} else {
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errorCallback(t, error);
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}
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}, errorCallback);
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}
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function getItem(key, callback) {
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var self = this;
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key = (0, _normalizeKey2.default)(key);
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var promise = new _promise2.default(function (resolve, reject) {
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self.ready().then(function () {
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var dbInfo = self._dbInfo;
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dbInfo.db.transaction(function (t) {
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tryExecuteSql(t, dbInfo, 'SELECT * FROM ' + dbInfo.storeName + ' WHERE key = ? LIMIT 1', [key], function (t, results) {
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var result = results.rows.length ? results.rows.item(0).value : null;
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// Check to see if this is serialized content we need to
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// unpack.
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if (result) {
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result = dbInfo.serializer.deserialize(result);
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}
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resolve(result);
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}, function (t, error) {
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reject(error);
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});
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});
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}).catch(reject);
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});
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(0, _executeCallback2.default)(promise, callback);
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return promise;
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}
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function iterate(iterator, callback) {
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var self = this;
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var promise = new _promise2.default(function (resolve, reject) {
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self.ready().then(function () {
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var dbInfo = self._dbInfo;
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dbInfo.db.transaction(function (t) {
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tryExecuteSql(t, dbInfo, 'SELECT * FROM ' + dbInfo.storeName, [], function (t, results) {
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var rows = results.rows;
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var length = rows.length;
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for (var i = 0; i < length; i++) {
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var item = rows.item(i);
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var result = item.value;
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// Check to see if this is serialized content
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// we need to unpack.
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if (result) {
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result = dbInfo.serializer.deserialize(result);
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}
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result = iterator(result, item.key, i + 1);
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// void(0) prevents problems with redefinition
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// of `undefined`.
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if (result !== void 0) {
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resolve(result);
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return;
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}
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}
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resolve();
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}, function (t, error) {
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reject(error);
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});
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});
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}).catch(reject);
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});
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(0, _executeCallback2.default)(promise, callback);
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return promise;
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}
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function _setItem(key, value, callback, retriesLeft) {
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var self = this;
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key = (0, _normalizeKey2.default)(key);
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var promise = new _promise2.default(function (resolve, reject) {
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self.ready().then(function () {
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// The localStorage API doesn't return undefined values in an
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// "expected" way, so undefined is always cast to null in all
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// drivers. See: https://github.com/mozilla/localForage/pull/42
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if (value === undefined) {
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value = null;
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}
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// Save the original value to pass to the callback.
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var originalValue = value;
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var dbInfo = self._dbInfo;
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dbInfo.serializer.serialize(value, function (value, error) {
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if (error) {
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reject(error);
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} else {
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dbInfo.db.transaction(function (t) {
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tryExecuteSql(t, dbInfo, 'INSERT OR REPLACE INTO ' + dbInfo.storeName + ' ' + '(key, value) VALUES (?, ?)', [key, value], function () {
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resolve(originalValue);
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}, function (t, error) {
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reject(error);
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});
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}, function (sqlError) {
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// The transaction failed; check
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// to see if it's a quota error.
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if (sqlError.code === sqlError.QUOTA_ERR) {
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// We reject the callback outright for now, but
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// it's worth trying to re-run the transaction.
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// Even if the user accepts the prompt to use
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// more storage on Safari, this error will
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// be called.
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//
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// Try to re-run the transaction.
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if (retriesLeft > 0) {
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resolve(_setItem.apply(self, [key, originalValue, callback, retriesLeft - 1]));
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return;
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}
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reject(sqlError);
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}
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});
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}
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});
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}).catch(reject);
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});
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(0, _executeCallback2.default)(promise, callback);
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return promise;
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}
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function setItem(key, value, callback) {
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return _setItem.apply(this, [key, value, callback, 1]);
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}
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function removeItem(key, callback) {
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var self = this;
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key = (0, _normalizeKey2.default)(key);
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var promise = new _promise2.default(function (resolve, reject) {
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self.ready().then(function () {
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var dbInfo = self._dbInfo;
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dbInfo.db.transaction(function (t) {
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tryExecuteSql(t, dbInfo, 'DELETE FROM ' + dbInfo.storeName + ' WHERE key = ?', [key], function () {
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resolve();
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}, function (t, error) {
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reject(error);
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});
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});
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}).catch(reject);
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});
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(0, _executeCallback2.default)(promise, callback);
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return promise;
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}
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// Deletes every item in the table.
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// TODO: Find out if this resets the AUTO_INCREMENT number.
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function clear(callback) {
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var self = this;
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var promise = new _promise2.default(function (resolve, reject) {
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self.ready().then(function () {
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var dbInfo = self._dbInfo;
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dbInfo.db.transaction(function (t) {
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tryExecuteSql(t, dbInfo, 'DELETE FROM ' + dbInfo.storeName, [], function () {
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resolve();
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}, function (t, error) {
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reject(error);
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});
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});
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}).catch(reject);
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});
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(0, _executeCallback2.default)(promise, callback);
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return promise;
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}
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// Does a simple `COUNT(key)` to get the number of items stored in
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// localForage.
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function length(callback) {
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var self = this;
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var promise = new _promise2.default(function (resolve, reject) {
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self.ready().then(function () {
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var dbInfo = self._dbInfo;
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dbInfo.db.transaction(function (t) {
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// Ahhh, SQL makes this one soooooo easy.
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tryExecuteSql(t, dbInfo, 'SELECT COUNT(key) as c FROM ' + dbInfo.storeName, [], function (t, results) {
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var result = results.rows.item(0).c;
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resolve(result);
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}, function (t, error) {
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reject(error);
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});
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});
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}).catch(reject);
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});
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(0, _executeCallback2.default)(promise, callback);
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return promise;
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}
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// Return the key located at key index X; essentially gets the key from a
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// `WHERE id = ?`. This is the most efficient way I can think to implement
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// this rarely-used (in my experience) part of the API, but it can seem
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// inconsistent, because we do `INSERT OR REPLACE INTO` on `setItem()`, so
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// the ID of each key will change every time it's updated. Perhaps a stored
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// procedure for the `setItem()` SQL would solve this problem?
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// TODO: Don't change ID on `setItem()`.
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function key(n, callback) {
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var self = this;
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var promise = new _promise2.default(function (resolve, reject) {
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self.ready().then(function () {
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var dbInfo = self._dbInfo;
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dbInfo.db.transaction(function (t) {
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tryExecuteSql(t, dbInfo, 'SELECT key FROM ' + dbInfo.storeName + ' WHERE id = ? LIMIT 1', [n + 1], function (t, results) {
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var result = results.rows.length ? results.rows.item(0).key : null;
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resolve(result);
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}, function (t, error) {
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reject(error);
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});
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});
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}).catch(reject);
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});
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(0, _executeCallback2.default)(promise, callback);
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return promise;
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}
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function keys(callback) {
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var self = this;
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var promise = new _promise2.default(function (resolve, reject) {
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self.ready().then(function () {
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var dbInfo = self._dbInfo;
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dbInfo.db.transaction(function (t) {
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tryExecuteSql(t, dbInfo, 'SELECT key FROM ' + dbInfo.storeName, [], function (t, results) {
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var keys = [];
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for (var i = 0; i < results.rows.length; i++) {
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keys.push(results.rows.item(i).key);
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}
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resolve(keys);
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}, function (t, error) {
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reject(error);
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});
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});
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}).catch(reject);
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});
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(0, _executeCallback2.default)(promise, callback);
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return promise;
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}
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// https://www.w3.org/TR/webdatabase/#databases
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// > There is no way to enumerate or delete the databases available for an origin from this API.
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function getAllStoreNames(db) {
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return new _promise2.default(function (resolve, reject) {
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db.transaction(function (t) {
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t.executeSql('SELECT name FROM sqlite_master ' + "WHERE type='table' AND name <> '__WebKitDatabaseInfoTable__'", [], function (t, results) {
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var storeNames = [];
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for (var i = 0; i < results.rows.length; i++) {
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storeNames.push(results.rows.item(i).name);
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}
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resolve({
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db: db,
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storeNames: storeNames
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});
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}, function (t, error) {
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reject(error);
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});
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}, function (sqlError) {
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reject(sqlError);
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});
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});
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}
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function dropInstance(options, callback) {
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callback = _getCallback2.default.apply(this, arguments);
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var currentConfig = this.config();
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options = typeof options !== 'function' && options || {};
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if (!options.name) {
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options.name = options.name || currentConfig.name;
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options.storeName = options.storeName || currentConfig.storeName;
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}
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var self = this;
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var promise;
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if (!options.name) {
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promise = _promise2.default.reject('Invalid arguments');
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} else {
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promise = new _promise2.default(function (resolve) {
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var db;
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if (options.name === currentConfig.name) {
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// use the db reference of the current instance
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db = self._dbInfo.db;
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} else {
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db = openDatabase(options.name, '', '', 0);
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}
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if (!options.storeName) {
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// drop all database tables
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resolve(getAllStoreNames(db));
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} else {
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resolve({
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db: db,
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storeNames: [options.storeName]
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});
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}
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}).then(function (operationInfo) {
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return new _promise2.default(function (resolve, reject) {
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operationInfo.db.transaction(function (t) {
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function dropTable(storeName) {
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return new _promise2.default(function (resolve, reject) {
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t.executeSql('DROP TABLE IF EXISTS ' + storeName, [], function () {
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resolve();
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}, function (t, error) {
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reject(error);
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});
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});
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}
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var operations = [];
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for (var i = 0, len = operationInfo.storeNames.length; i < len; i++) {
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operations.push(dropTable(operationInfo.storeNames[i]));
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}
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_promise2.default.all(operations).then(function () {
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resolve();
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}).catch(function (e) {
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reject(e);
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});
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}, function (sqlError) {
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reject(sqlError);
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});
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});
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});
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}
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(0, _executeCallback2.default)(promise, callback);
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return promise;
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}
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var webSQLStorage = {
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_driver: 'webSQLStorage',
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_initStorage: _initStorage,
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_support: (0, _isWebSQLValid2.default)(),
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iterate: iterate,
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getItem: getItem,
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setItem: setItem,
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removeItem: removeItem,
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clear: clear,
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length: length,
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key: key,
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keys: keys,
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dropInstance: dropInstance
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};
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exports.default = webSQLStorage;
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module.exports = exports['default'];
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});
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