// (C) Copyright 2015 Moodle Pty Ltd. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. import { EnvironmentConfig } from '@/types/config'; import { Injectable } from '@angular/core'; import { CoreDatabaseCachingStrategy, CoreDatabaseTableProxy } from '@classes/database/database-table-proxy'; import { CoreApp } from '@services/app'; import { APP_SCHEMA, ConfigDBEntry, CONFIG_TABLE_NAME } from '@services/database/config'; import { makeSingleton } from '@singletons'; import { CoreConstants } from '../constants'; import { CoreEvents } from '@singletons/events'; import { CoreDatabaseTable } from '@classes/database/database-table'; import { asyncInstance } from '../utils/async-instance'; declare module '@singletons/events' { /** * Augment CoreEventsData interface with events specific to this service. * * @see https://www.typescriptlang.org/docs/handbook/declaration-merging.html#module-augmentation */ export interface CoreEventsData { [CoreConfigProvider.ENVIRONMENT_UPDATED]: EnvironmentConfig; } } /** * Factory to provide access to dynamic and permanent config and settings. * It should not be abused into a temporary storage. */ @Injectable({ providedIn: 'root' }) export class CoreConfigProvider { static readonly ENVIRONMENT_UPDATED = 'environment_updated'; protected table = asyncInstance>(); protected defaultEnvironment?: EnvironmentConfig; /** * Initialize database. */ async initializeDatabase(): Promise { try { await CoreApp.createTablesFromSchema(APP_SCHEMA); } catch (e) { // Ignore errors. } const table = new CoreDatabaseTableProxy( { cachingStrategy: CoreDatabaseCachingStrategy.Eager }, CoreApp.getDB(), CONFIG_TABLE_NAME, ['name'], ); await table.initialize(); this.table.setInstance(table); } /** * Deletes an app setting. * * @param name The config name. * @return Promise resolved when done. */ async delete(name: string): Promise { await this.table.deleteByPrimaryKey({ name }); } /** * Get an app setting. * * @param name The config name. * @param defaultValue Default value to use if the entry is not found. * @return Resolves upon success along with the config data. Reject on failure. */ async get(name: string, defaultValue?: T): Promise { try { const record = await this.table.getOneByPrimaryKey({ name }); return record.value; } catch (error) { if (defaultValue !== undefined) { return defaultValue; } throw error; } } /** * Set an app setting. * * @param name The config name. * @param value The config value. Can only store number or strings. * @return Promise resolved when done. */ async set(name: string, value: number | string): Promise { await this.table.insert({ name, value }); } /** * Update config with the given values. * * @param config Config updates. */ patchEnvironment(config: Partial): void { this.defaultEnvironment = this.defaultEnvironment ?? CoreConstants.CONFIG; Object.assign(CoreConstants.CONFIG, config); CoreEvents.trigger(CoreConfigProvider.ENVIRONMENT_UPDATED, CoreConstants.CONFIG); } /** * Reset config values to its original state. */ resetEnvironment(): void { if (!this.defaultEnvironment) { // The environment config hasn't been modified; there's not need to reset. return; } Object.keys(CoreConstants.CONFIG).forEach(key => delete CoreConstants.CONFIG[key]); Object.assign(CoreConstants.CONFIG, this.defaultEnvironment); CoreEvents.trigger(CoreConfigProvider.ENVIRONMENT_UPDATED, CoreConstants.CONFIG); } } export const CoreConfig = makeSingleton(CoreConfigProvider);