http.go

package main

import (
	"context"
	"fmt"
	"log"
	"net/http"
	"os"
	"os/signal"
	"syscall"
	"time"
)

func StartHTTP() {
	port := fmt.Sprintf(":%d", args.httpPort)
	log.Printf("Starting HTTP server on %s", port)
	// Create a mux for routing incoming requests
	myHandler := http.NewServeMux()

	// All URLs will be handled by this function
	myHandler.HandleFunc("/", handleRequest)

	s := &http.Server{
		Addr:           port,
		Handler:        myHandler,
		ReadTimeout:    60 * time.Second,
		WriteTimeout:   60 * time.Second,
		MaxHeaderBytes: 1 << 20,
	}

	done := make(chan os.Signal, 1)
	signal.Notify(done, os.Interrupt, syscall.SIGINT, syscall.SIGTERM)

	go func() {
		if err := s.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Fatalf("listen: %s\n", err)
		}
	}()
	log.Print("Server Started")

	<-done
	log.Print("Server Stopped")

	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer func() {
		// extra handling here
		cancel()
	}()

	if err := s.Shutdown(ctx); err != nil {
		log.Fatalf("Server Shutdown Failed:%+v", err)
	}
	log.Print("Server Exited Properly")
}