raco-express

Express middleware wrapper for raco generator function.

npm install raco raco-express

This is a raco version of co-express, which supports 'yielding' callback functions using next(err, val).

Calling next() without argument, passes control to the next middleware stack.

app = wrap(express())

router = wrap(express.Router())

mw = wrap(mw*)

var express = require('express')
var wrap = require('raco-express')
var fs = require('fs')

// wrap express application
var app = wrap(express())

app.get('/foo', function * (req, res, next) {
  // yield callback function using raco next(err, val)
  req.data = yield fs.readFile('./data.json', 'utf8', next)
  yield setTimeout(next, 10)

  next() // calling next() passes to next middleware
}, function (req, res) {
  res.send(req.data)
})

app.route('/bar').get(function * (req, res, next) {
  req.send(yield fs.readFile('./bar.json', 'utf8', next))
})


// wrap express router
var errRouter = wrap(express.Router())
// 4 arguments for error handling middleware
errRouter.use(function * (err, req, res, next) {
  res.status(500).send({ 
    success: false, 
    message: err.message 
  })
})
app.use(errRouter)


// wrap express middleware
var mw = wrap(function * (req, res, next) {
  // yield callback function using raco next(err, val)
  req.data = yield fs.readFile('./data.json', 'utf8', next)
  yield setTimeout(next, 10)

  next() // calling next() passes to next middleware
})
...

License

MIT