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import express, { Express } from 'express'; |
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import { CreateExpressBeansOptions, ExpressBeansOptions, ExpressRouterBean } from '@/ExpressBeansTypes'; |
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import { logger, registeredBeans } from '@/decorators'; |
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export default class ExpressBeans { |
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private readonly app: Express; |
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private onInitialized: (() => void) | undefined; |
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/** |
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* Creates a new ExpressBeans application |
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* @param options {ExpressBeansOptions} |
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*/ |
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static createApp(options?: Partial<CreateExpressBeansOptions>): Promise<ExpressBeans> { |
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return new Promise((resolve, reject) => { |
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let app: ExpressBeans; |
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const onInitialized = () => { |
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resolve(app); |
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}; |
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app = new ExpressBeans({ ...options, onInitialized, onError: reject }); |
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}); |
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} |
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/** |
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* Constructor of ExpressBeans application |
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* @constructor |
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* @param options {ExpressBeansOptions} |
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*/ |
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constructor(options?: Partial<ExpressBeansOptions>) { |
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this.app = express(); |
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this.app.disable('x-powered-by'); |
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this.initialize(options || {}); |
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} |
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/** |
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* Initializes the application and checks |
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* if all beans are valid |
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* @param listen {boolean} |
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* @param port {number} |
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* @param beans {Object[]} |
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* @param onInitialized {Function} |
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* @private |
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*/ |
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private initialize({ |
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listen = true, |
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port = 8080, |
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routerBeans = [], |
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onInitialized, |
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onError, |
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}: Partial<ExpressBeansOptions>) { |
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this.onInitialized = onInitialized; |
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this.checkRouterBeans(routerBeans); |
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setImmediate(async () => { |
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try { |
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this.registerRouters(); |
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if (listen) { |
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this.listen(port); |
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} |
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} catch (err: any) { |
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if (onError) { |
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onError(err); |
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} else { |
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logger.error(new Error('Critical error', { cause: err })); |
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process.exit(1); |
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} |
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} |
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}); |
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} |
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/** |
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* Starts the server and calls onInitialized callback |
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* @param {number} port |
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*/ |
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listen(port: number) { |
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return this.app.listen(port, () => { |
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logger.info(`Server listening on port ${port}`); |
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if (this.onInitialized) { |
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this.onInitialized(); |
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} |
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}); |
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} |
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private registerRouters() { |
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Array.from(registeredBeans.values()) |
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.map((bean) => bean as ExpressRouterBean) |
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.filter((bean) => bean.routerConfig) |
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.forEach((bean) => { |
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try { |
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const { |
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path, |
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router, |
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} = bean.routerConfig; |
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logger.debug(`Registering router ${bean.className}`); |
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this.app.use(path, router); |
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} catch (e) { |
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logger.error(e); |
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throw new Error(`Router ${bean.className} not initialized correctly`); |
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} |
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}); |
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} |
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private checkRouterBeans(routerBeans: Array<ExpressRouterBean>) { |
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const invalidBeans = routerBeans |
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.filter(((bean) => !bean.isExpressBean)) |
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.map((object: any) => object.prototype.constructor.name); |
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if (invalidBeans.length > 0) { |
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throw new Error(`Trying to use something that is not an ExpressBean: ${invalidBeans.join(', ')}`); |
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} |
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} |
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/** |
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* Gets Express application |
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* @returns {Express} |
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*/ |
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getApp() { |
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return this.app; |
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} |
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/** |
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* Exposes use function of Express application |
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* @param handlers |
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*/ |
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use(...handlers: any) { |
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1 |
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this.app.use(...handlers); |
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} |
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} |
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spaghiajoeojo /
express-beans
