generic-middleware-dispatcher
An Express-like generic middleware dispatcher with a settable number of contexts and typescript support.
Install
npm install generic-middleware-dispatcher
Examples
Javascript
const { createMiddlewareDispatcher } = require('generic-middleware-dispatcher')
const http = require('http')
// createMiddlewareDispatcher defaults to 2 context objects
const app = createMiddlewareDispatcher()
app.use(function (req, res, next) {
console.log(req.method, req.url)
if (req.url === '/') {
next()
} else {
next(new Error('Page Not Found'))
}
})
app.use(function (req, res, next) {
console.log('success')
res.end('Welcome!')
next()
})
app.use(function (err, req, res, next) {
console.error(err.message)
if (/Page Not Found/i.test(err.message)) {
res.statusCode = 404
res.end(err.message)
} else {
res.statusCode = 500
res.end('Internal Server Error')
}
})
http.createServer(app).listen(8080)Typescript
import {
createMiddlewareDispatcher,
NextCallback,
} from 'generic-middleware-dispatcher'
import { Server, Socket } from 'socket.io'
const io = new Server(3000)
// createMiddlewareDispatcher with 1 context object that has a type of 'Socket'
const middleware = createMiddlewareDispatcher<[Socket]>(1)
io.use(middleware)
middleware.use(function (socket: Socket, next: NextCallback) {
console.log(socket.handshake.address)
if (/127.0.0.1$/.test(socket.handshake.address)) {
next()
} else {
next(new Error('Unauthorized'))
}
})
middleware.use(function (socket: Socket, next: NextCallback) {
console.log('success')
socket.emit('message', 'Welcome!')
next()
})
middleware.use(function (err: any, socket: Socket, next: NextCallback) {
console.error(err.message)
next(err)
})