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1 | import Bluebird from 'bluebird' | |
2 | import { NextFunction, Request, RequestHandler, Response } from 'express' | |
3 | import { ValidationChain } from 'express-validator' | |
4 | import { ExpressPromiseHandler } from '@server/types/express-handler' | |
5 | import { retryTransactionWrapper } from '../helpers/database-utils' | |
6 | ||
7 | // Syntactic sugar to avoid try/catch in express controllers/middlewares | |
8 | ||
9 | export type RequestPromiseHandler = ValidationChain | ExpressPromiseHandler | |
10 | ||
11 | function asyncMiddleware (fun: RequestPromiseHandler | RequestPromiseHandler[]) { | |
12 | return (req: Request, res: Response, next: NextFunction) => { | |
13 | if (Array.isArray(fun) === true) { | |
14 | return Bluebird.each(fun as RequestPromiseHandler[], f => { | |
15 | return new Promise<void>((resolve, reject) => { | |
16 | return asyncMiddleware(f)(req, res, err => { | |
17 | if (err) return reject(err) | |
18 | ||
19 | return resolve() | |
20 | }) | |
21 | }) | |
22 | }).then(() => next()) | |
23 | .catch(err => next(err)) | |
24 | } | |
25 | ||
26 | return Promise.resolve((fun as RequestHandler)(req, res, next)) | |
27 | .catch(err => next(err)) | |
28 | } | |
29 | } | |
30 | ||
31 | function asyncRetryTransactionMiddleware (fun: (req: Request, res: Response, next: NextFunction) => Promise<any>) { | |
32 | return (req: Request, res: Response, next: NextFunction) => { | |
33 | return Promise.resolve( | |
34 | retryTransactionWrapper(fun, req, res, next) | |
35 | ).catch(err => next(err)) | |
36 | } | |
37 | } | |
38 | ||
39 | // --------------------------------------------------------------------------- | |
40 | ||
41 | export { | |
42 | asyncMiddleware, | |
43 | asyncRetryTransactionMiddleware | |
44 | } |