main.go

package main

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

func main() {
	log.Println("Starting setup... (simulating 10s delay)")
	time.Sleep(10 * time.Second) // Simulated setup time
	log.Println("Setup complete. Starting server...")

	mux := http.NewServeMux()

	// Route: /
	mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		fmt.Fprintln(w, "Hello from Go HTTP server!")
	})

	// Route: /health
	mux.HandleFunc("/health", func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusOK)
		fmt.Fprintln(w, "OK")
	})

	server := &http.Server{
		Addr:    ":8080",
		Handler: mux,
	}

	// Graceful shutdown setup
	idleConnsClosed := make(chan struct{})
	go func() {
		sigint := make(chan os.Signal, 1)
		signal.Notify(sigint, os.Interrupt)
		<-sigint

		log.Println("Shutting down gracefully...")
		ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
		defer cancel()

		if err := server.Shutdown(ctx); err != nil {
			log.Printf("HTTP server Shutdown: %v", err)
		}
		close(idleConnsClosed)
	}()

	log.Println("Starting server on http://localhost:8080")
	if err := server.ListenAndServe(); err != http.ErrServerClosed {
		log.Fatalf("HTTP server ListenAndServe: %v", err)
	}

	<-idleConnsClosed
	log.Println("Server stopped.")
}