express_cowrap
v1.0.1 generators coroutine express
express_cowrap
Wraps Express middleware functions so you can use proper error handling for applications depending heavily on Promises. Examples:
const Promise = require('bluebird')
const coWrap = require('express_cowrap')
const express = require('express')
let app = express()
// Promise-returing function
app.get('/promise', coWrap(function (req, res) {
return Promise.reject('error message')
})
// Regular, synchronous function
app.get('/sync', coWrap(function (req, res) {
throw new Error('error message')
}))
// Generator function (with yield)
app.get('/generators', coWrap(function* (req, res) {
let data = yield database.query() // promise-returning function
yield Promise.delay(20)
throw new Error('error message')
// Won't execute this
res.status(200).send({ message: "You won't see me!" })
}))
// Error handler
app.use(function errorHandler(err, req, res, next) {
console.log('[Error happened]', err)
res.status(500).send({ error: (err.message || err) })
})
npm i [email protected]
Metadata
- ISC
- Whatever
- Daniel Pedroso
- released 5/19/2016