server/middlewares/async.ts

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