main.go

package main

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

var configfile = flag.String(
	"configfile",
	"./config.yml",
	"YAML config file",
)

func main() {
	log.Println("[*] Starting")

	flag.Parse()

	srv := CreateServer(*configfile)

	go func() {
		log.Printf("[x] Stop server due to %s\n", srv.ListenAndServe())
	}()

	stop := make(chan os.Signal, 1)
	signal.Notify(stop, os.Interrupt)

	<-stop

	log.Println("[*] Shutdown Server ...")

	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	if err := srv.Shutdown(ctx); err != nil {
		log.Fatal("[*] Server Shutdown:", err)
	}

	log.Println("[*] Server exiting")
}

func CreateServer(configfilePath string) *http.Server {
	config, err := LoadConfigYAML(configfilePath)

	if err != nil {
		log.Fatalf("[*] Can not load config file %s\n", configfilePath)
	}

	serviceLocator, err := BuildServiceLocator(config)

	if err != nil {
		log.Fatal("[*] Can not load services")
	}

	router := CreateRouter(serviceLocator)

	srv := &http.Server{
		Addr:    config.ServerAddr,
		Handler: router,
	}

	return srv
}