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Wetland.ts
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Wetland.ts
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import {EntityManager} from './EntityManager';
import {Store, PoolConfig, ReplicationConfig, SingleConfig} from './Store';
import {Homefront} from 'homefront';
import {Scope} from './Scope';
import {EntityInterface, EntityCtor} from './EntityInterface';
import {Migrator} from './Migrator/Migrator';
import * as fs from 'fs';
import * as mkdirp from 'mkdirp';
import * as path from 'path';
import {SnapshotManager} from './SnapshotManager';
import {SchemaManager} from './SchemaManager';
import {Populate} from './Populate';
import {Seeder} from './Seeder';
import {Cleaner} from './Cleaner';
export class Wetland {
/**
* @type {EntityManager}
*/
private entityManager: EntityManager = new EntityManager(this);
/**
* @type {Migrator}
*/
private migrator: Migrator;
/**
* @type {SnapshotManager}
*/
private snapshotManager: SnapshotManager;
/**
* @type {Homefront}
*/
private config: Homefront = new Homefront({
debug : false,
useForeignKeys: true,
dataDirectory : path.resolve(process.cwd(), '.data'),
defaultStore : 'defaultStore',
mapping : {
defaultNamesToUnderscore: false,
defaults : {cascades: []}
},
entityManager : {
refreshCreated: true,
refreshUpdated: true
}
});
/**
* @type {{}}
*/
private stores: { [key: string]: Store } = {};
/**
* @type {SchemaManager}
*/
private schema: SchemaManager;
/**
* Construct a new wetland instance.
*
* @param {{}} [config]
*/
public constructor(config?: Object) {
this.ensureDataDirectory(this.config.fetch('dataDirectory'));
this.setupExitListeners();
this.initializeConfig(config);
}
/**
* Initialize the config.
*
* @param {{}} config
*/
private initializeConfig(config: Object) {
if (config) {
this.config.merge(config);
}
let stores = this.config.fetch('stores');
let entities = this.config.fetch('entities');
let entityPaths = this.config.fetch('entityPaths', []);
let entityPath = this.config.fetch('entityPath');
if (stores) {
this.registerStores(stores);
} else {
this.registerDefaultStore();
}
if (entities) {
this.registerEntities(entities);
}
if (entityPath) {
entityPaths.push(entityPath);
}
if (!entityPaths.length) {
return;
}
entityPaths.forEach(entityPath => {
fs.readdirSync(entityPath)
.filter(match => match.search(/\.js$/) > -1)
.map(entity => entity.replace(/\.js$/, ''))
.forEach(entity => {
let filePath = path.resolve(entityPath, entity);
let entityModule = require(filePath);
let ToRegister = entityModule;
if (typeof ToRegister !== 'function') {
ToRegister = entityModule.default;
}
if (typeof ToRegister !== 'function') {
ToRegister = entityModule[entity];
}
if (typeof ToRegister !== 'function') {
throw new Error(`Error loading entity '${entity}'. No constructor exported.`);
}
this.registerEntity(ToRegister);
});
});
}
/**
* Get the wetland config.
*
* @returns {Homefront}
*/
public getConfig(): Homefront {
return this.config;
}
/**
* Register an entity with the entity manager.
*
* @param {EntityInterface} entity
*
* @returns {Wetland}
*/
public registerEntity(entity: EntityCtor<EntityInterface>): Wetland {
this.entityManager.registerEntity(entity);
return this;
}
/**
* Register multiple entities with the entity manager.
*
* @param {EntityInterface[]} entities
*
* @returns {Wetland}
*/
public registerEntities(entities: Array<EntityCtor<EntityInterface>>): Wetland {
this.entityManager.registerEntities(entities);
return this;
}
/**
* Register stores with wetland.
*
* @param {Object} stores
*
* @returns {Wetland}
*/
public registerStores(stores: Object): Wetland {
for (let store in stores) {
this.registerStore(store, stores[store]);
}
return this;
}
/**
* Register a store with wetland.
*
* @param {string} store
* @param {{}} config
*
* @returns {Wetland}
*/
public registerStore(store: string, config: PoolConfig | ReplicationConfig | SingleConfig): Wetland {
if (this.config.fetch('debug')) {
config.debug = true;
}
this.stores[store] = new Store(store, config);
// The first registered store is the default store.
this.config.fetchOrPut('defaultStore', store);
return this;
}
/**
* Get a store by name.
*
* @param {string} storeName
*
* @returns {Store}
*/
public getStore(storeName?: string): Store {
storeName = storeName || this.config.fetch('defaultStore');
if (!storeName) {
throw new Error('No store name supplied, and no default store found.');
}
let store = this.stores[storeName];
if (!store) {
throw new Error(`No store called "${storeName}" found.`)
}
return store;
}
/**
* Get a seeder.
*
* @return {Seeder}
*/
public getSeeder(): Seeder {
return new Seeder(this);
}
/**
* Get a cleaner.
*
* @return {Cleaner}
*/
public getCleaner(): Cleaner {
return new Cleaner(this);
}
/**
* Get a scoped entityManager. Example:
*
* let wet = new Wetland();
* wet.getManager();
*
* @returns {Scope}
*/
public getManager(): Scope {
return this.entityManager.createScope();
}
/**
* Get the root entity manager.
*
* @returns {EntityManager}
*/
public getEntityManager(): EntityManager {
return this.entityManager;
}
/**
* Get the migrator.
*
* @returns {Migrator}
*/
public getMigrator(): Migrator {
if (!this.migrator) {
this.migrator = new Migrator(this);
}
return this.migrator;
}
/**
* Get the schema.
*
* @returns {SchemaManager}
*/
public getSchemaManager(): SchemaManager {
if (!this.schema) {
this.schema = new SchemaManager(this);
}
return this.schema;
}
/**
* Get the snapshot engine.
*
* @returns {SnapshotManager}
*/
public getSnapshotManager(): SnapshotManager {
if (!this.snapshotManager) {
this.snapshotManager = new SnapshotManager(this);
}
return this.snapshotManager;
}
/**
* @returns {Populate}
*/
public getPopulator(scope: Scope): Populate {
return new Populate(scope);
}
/**
* Destroy all active connections.
*
* @returns {Promise<any>}
*/
public destroyConnections(): Promise<any> {
let destroys = [];
Object.getOwnPropertyNames(this.stores).forEach(storeName => {
let connections = this.stores[storeName].getConnections();
connections[Store.ROLE_SLAVE].forEach(connection => {
destroys.push(connection.destroy().then());
});
connections[Store.ROLE_MASTER].forEach(connection => {
destroys.push(connection.destroy().then());
});
});
return Promise.all(destroys);
}
/**
* set of listeners for the exit event.
*/
private setupExitListeners() {
process.on('beforeExit', () => this.destroyConnections());
}
/**
* Register a default (fallback) store (sqlite3).
*/
private registerDefaultStore() {
try {
require('sqlite3');
} catch (error) {
throw new Error(
'No stores configured and sqlite3 not found as dependency. ' +
'Configure a store, or run `npm i --save sqlite3`.'
);
}
this.registerStore(this.config.fetch('defaultStore'), {
client : 'sqlite3',
useNullAsDefault: true,
connection : {filename: `${this.config.fetch('dataDirectory')}/wetland.sqlite`}
});
}
/**
* Ensure that the data directory exists.
*
* @param {string} dataDirectory
*/
private ensureDataDirectory(dataDirectory: string) {
try {
fs.statSync(dataDirectory);
} catch (error) {
try {
mkdirp.sync(dataDirectory);
} catch (error) {
throw new Error(`Unable to create data directory at '${dataDirectory}'`);
}
}
}
}