http-compose

minimal http handler composition

npm install --save http-compose

inspired by creationix/stack and the middleware format in yoshuawuyts/merry

example

const http = require('http')
const compose = require('http-compose')
const Send = require('http-sender')()

const requestHandler = compose([
  (req, res, context, next) => {
    if (req.url === '/first') next(null, 'first')
    else next()
  },
  (req, res, context, next) => {
    context.yes = true
    next()
  },
  (req, res, context, next) => {
    if (req.url === '/error') next(new Error('Bad request'))
    else next()
  },
  (req, res, context, next) => {
    if (req.url !== '/404') next(null, context.yes)
    else next()
  },
])

http.createServer((req, res) => {
  requestHandler(req, res, {}, Send(req, res))
}).listen(5000)

usage

compose = require('http-compose')

handler = compose(handlers)

where a handler function is of shape:

function handler (req, res, context, next) {
  next(err, value)
}

composes an Array of handler functions into a single handler function.

if any handler function passes either an err or value to next(), compose will skip any subsequent handlers and forward this to the final next() callback.

complementary modules

• ahdinosaur/http-sender
• ahdinosaur/http-routes

related modules

• creationix/stack
• yoshuawuyts/nanostack

license

The Apache License

Copyright © 2017 Michael Williams

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.