Creates a connect style middleware chain

middleware.go

package middlware

import (
	"fmt"
	"log"
	"net/http"
)

// MiddlewareNext invokes the next middleware
type MiddlewareNext func()

// MiddlewareHandler for http.HandleFunc
type MiddlewareHandler func(res http.ResponseWriter, req *http.Request, next MiddlewareNext)

// Middleware creates a left-to-right
// executed Http handles
func Middleware(handlers ...MiddlewareHandler) http.HandlerFunc {
	return func(res http.ResponseWriter, req *http.Request) {
		var handlersLength = len(handlers)

		// Defining next type signature before assigning.
		// This is necessary for recursion in go
		var next func(i int) MiddlewareNext
		next = func(i int) MiddlewareNext {
			return func() {
				// Check if index is out of range
				if handlersLength <= i {
					log.Println(fmt.Errorf("You cannot call `next` on a handler with no consecutive handler"))
					return
				}
				handlers[i](res, req, next(i+1))
			}
		}

		// Invoke the first handler middleware
		handlers[0](res, req, next(1))
	}
}