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4e50b6a1 | 1 | import { eachSeries } from 'async' |
a2431b7d | 2 | import { NextFunction, Request, RequestHandler, Response } from 'express' |
523990db | 3 | import { ValidationChain } from 'express-validator' |
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4 | import { ExpressPromiseHandler } from '@server/types/express' |
5 | import { retryTransactionWrapper } from '../helpers/database-utils' | |
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6 | |
7 | // Syntactic sugar to avoid try/catch in express controllers | |
8 | // Thanks: https://medium.com/@Abazhenov/using-async-await-in-express-with-node-8-b8af872c0016 | |
a2431b7d | 9 | |
ba5a8d89 | 10 | export type RequestPromiseHandler = ValidationChain | ExpressPromiseHandler |
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11 | |
12 | function asyncMiddleware (fun: RequestPromiseHandler | RequestPromiseHandler[]) { | |
eb080476 | 13 | return (req: Request, res: Response, next: NextFunction) => { |
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14 | if (Array.isArray(fun) === true) { |
15 | return eachSeries(fun as RequestHandler[], (f, cb) => { | |
5182473f | 16 | Promise.resolve(f(req, res, err => cb(err))) |
e3a682a8 | 17 | .catch(err => next(err)) |
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18 | }, next) |
19 | } | |
20 | ||
21 | return Promise.resolve((fun as RequestHandler)(req, res, next)) | |
e3a682a8 | 22 | .catch(err => next(err)) |
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23 | } |
24 | } | |
25 | ||
523990db | 26 | function asyncRetryTransactionMiddleware (fun: (req: Request, res: Response, next: NextFunction) => Promise<any>) { |
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27 | return (req: Request, res: Response, next: NextFunction) => { |
28 | return Promise.resolve( | |
29 | retryTransactionWrapper(fun, req, res, next) | |
30 | ).catch(err => next(err)) | |
31 | } | |
32 | } | |
33 | ||
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34 | // --------------------------------------------------------------------------- |
35 | ||
36 | export { | |
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37 | asyncMiddleware, |
38 | asyncRetryTransactionMiddleware | |
eb080476 | 39 | } |