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import { eachSeries } from 'async'
import { NextFunction, Request, RequestHandler, Response } from 'express'
import { retryTransactionWrapper } from '../helpers/database-utils'
import { ValidationChain } from 'express-validator'
// Syntactic sugar to avoid try/catch in express controllers
// Thanks: https://medium.com/@Abazhenov/using-async-await-in-express-with-node-8-b8af872c0016
export type RequestPromiseHandler = ValidationChain | ((req: Request, res: Response, next: NextFunction) => Promise<any>)
function asyncMiddleware (fun: RequestPromiseHandler | RequestPromiseHandler[]) {
return (req: Request, res: Response, next: NextFunction) => {
if (Array.isArray(fun) === true) {
return eachSeries(fun as RequestHandler[], (f, cb) => {
Promise.resolve(f(req, res, cb))
.catch(err => next(err))
}, next)
}
return Promise.resolve((fun as RequestHandler)(req, res, next))
.catch(err => next(err))
}
}
function asyncRetryTransactionMiddleware (fun: (req: Request, res: Response, next: NextFunction) => Promise<any>) {
return (req: Request, res: Response, next: NextFunction) => {
return Promise.resolve(
retryTransactionWrapper(fun, req, res, next)
).catch(err => next(err))
}
}
// ---------------------------------------------------------------------------
export {
asyncMiddleware,
asyncRetryTransactionMiddleware
}
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