main.go

package main

import (
	"log"
	"net/http"
)

type handlers struct{}

func (h *handlers) Middleware(next http.HandlerFunc) http.HandlerFunc {
	log.Println("defining middleware")
	return func(w http.ResponseWriter, r *http.Request) {
		log.Println("in middleware")
		next(w, r)
	}
}

func (h *handlers) SetupRoutes(mux *http.ServeMux) {
	mux.HandleFunc("/", h.Middleware(analyzeRequest))
}

func childFunc() {
	log.Println("in childFunc")
}

func analyzeRequest(w http.ResponseWriter, r *http.Request) {
	log.Println("in analyzeRequest")

	childFunc()

	message := "hello from go server"
	w.Write([]byte(message))
}

func main() {
	mux := http.NewServeMux()
	handler := &handlers{}
	handler.SetupRoutes(mux)

	ipPort := ":8080"

	srv := &http.Server{
		Addr:    ipPort,
		Handler: mux,
	}

	log.Println("listening in " + ipPort)
	if err := srv.ListenAndServe(); err != nil {
		panic(err)
	}
}