one_item_one_code/main.go

package main

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

	"applet/app/cfg"
	"applet/app/db"
	"applet/app/router"
)

//系统初始化
func init() {
	cfg.InitCfg()   //配置初始化
	cfg.InitLog()   //日志初始化
	cfg.InitCache() //缓存初始化
	if cfg.Debug {  //判断是否是debug
		if err := db.InitDB(cfg.DB); err != nil { //主数据库初始化
			panic(err)
		}
	}
	fmt.Println("init success")

}

func main() {
	r := router.Init() //创建路由

	srv := &http.Server{ //设置http服务参数
		Addr:    cfg.SrvAddr, //指定ip和端口
		Handler: r,           //指定路由
	}

	go func() { //协程启动监听http服务
		fmt.Println("Listening and serving HTTP on " + cfg.SrvAddr)
		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
			log.Fatalf("listen: %s\n", err)
		}
	}()

	//退出go守护进程
	quit := make(chan os.Signal)
	signal.Notify(quit, syscall.SIGINT, syscall.SIGTERM)
	<-quit
	log.Println("Shutting down server...")
	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()
	if err := srv.Shutdown(ctx); err != nil {
		log.Fatal("Server forced to shutdown:", err)
	}
	log.Println("Server exiting")

}