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import Bluebird from 'bluebird'
import { NextFunction, Request, RequestHandler, Response } from 'express'
import { ValidationChain } from 'express-validator'
import { ExpressPromiseHandler } from '@server/types/express-handler'
import { retryTransactionWrapper } from '../helpers/database-utils'
// Syntactic sugar to avoid try/catch in express controllers/middlewares
export type RequestPromiseHandler = ValidationChain | ExpressPromiseHandler
function asyncMiddleware (fun: RequestPromiseHandler | RequestPromiseHandler[]) {
return (req: Request, res: Response, next: NextFunction) => {
if (Array.isArray(fun) === true) {
return Bluebird.each(fun as RequestPromiseHandler[], f => {
return new Promise<void>((resolve, reject) => {
return asyncMiddleware(f)(req, res, err => {
if (err) return reject(err)
return resolve()
})
})
}).then(() => next())
.catch(err => next(err))
}
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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