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1 | import { eachSeries } from 'async' | |
2 | import { NextFunction, Request, RequestHandler, Response } from 'express' | |
3 | import { retryTransactionWrapper } from '../helpers/database-utils' | |
4 | import { ValidationChain } from 'express-validator' | |
5 | ||
6 | // Syntactic sugar to avoid try/catch in express controllers | |
7 | // Thanks: https://medium.com/@Abazhenov/using-async-await-in-express-with-node-8-b8af872c0016 | |
8 | ||
9 | export type RequestPromiseHandler = ValidationChain | ((req: Request, res: Response, next: NextFunction) => Promise<any>) | |
10 | ||
11 | function asyncMiddleware (fun: RequestPromiseHandler | RequestPromiseHandler[]) { | |
12 | return (req: Request, res: Response, next: NextFunction) => { | |
13 | if (Array.isArray(fun) === true) { | |
14 | return eachSeries(fun as RequestHandler[], (f, cb) => { | |
15 | Promise.resolve(f(req, res, cb)) | |
16 | .catch(err => next(err)) | |
17 | }, next) | |
18 | } | |
19 | ||
20 | return Promise.resolve((fun as RequestHandler)(req, res, next)) | |
21 | .catch(err => next(err)) | |
22 | } | |
23 | } | |
24 | ||
25 | function asyncRetryTransactionMiddleware (fun: (req: Request, res: Response, next: NextFunction) => Promise<any>) { | |
26 | return (req: Request, res: Response, next: NextFunction) => { | |
27 | return Promise.resolve( | |
28 | retryTransactionWrapper(fun, req, res, next) | |
29 | ).catch(err => next(err)) | |
30 | } | |
31 | } | |
32 | ||
33 | // --------------------------------------------------------------------------- | |
34 | ||
35 | export { | |
36 | asyncMiddleware, | |
37 | asyncRetryTransactionMiddleware | |
38 | } |