package main

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

func main() {
	mux := http.NewServeMux()
	mux.HandleFunc("/health", func(w http.ResponseWriter, r *http.Request) {
		_, _ = w.Write([]byte("ok\n"))
	})

	srv := &http.Server{
		Addr:              "127.0.0.1:8080",
		Handler:           mux,
		ReadHeaderTimeout: 5 * time.Second,
	}

	ctx, stop := signal.NotifyContext(context.Background(), syscall.SIGINT, syscall.SIGTERM)
	defer stop()

	go func() {
		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Fatal(err)
		}
	}()

	<-ctx.Done()
	shutdown, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	if err := srv.Shutdown(shutdown); err != nil {
		log.Printf("shutdown: %v", err)
	}
}