Example main with chan args

golang_test_main_http_server_main.go

package main

import (
	"context"
	"github.com/gorilla/mux"
	"github.com/oklog/run"
	"log"
	"net/http"
	"os"
	"os/signal"
	"syscall"
)

func getServer() *http.Server {
	r := mux.NewRouter()
	r.HandleFunc("/some-handler", func(http.ResponseWriter, *http.Request) {})
	srv := &http.Server{
		Handler: r,
		Addr:    ":8080",
	}
	return srv
}

func Main(done chan bool) error {
	g := run.Group{}
	{
		srv := getServer()
		g.Add(func() error {
			log.Println("Service initialization - HTTP server started")
			if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
				log.Println("Error in http server : " + err.Error())
				return err
			}
			log.Println("Service shutting down")
			return nil
		}, func(error) {
			_ = srv.Shutdown(context.Background())
		})

	}

	{
		sig := make(chan os.Signal, 1)
		g.Add(func() error {
			signal.Notify(sig, os.Interrupt, syscall.SIGTERM)
			select {
			case <-sig:
			case <-done:
			}
			return nil
		}, func(error) {
		})
	}

	return g.Run()
}

func main() {
	if err := Main(nil); err != nil {
		log.Printf("Service exit due to %s\n", err.Error())
	}
}