STEP 1:

git clone https://github.com/devopsmi/daemon
cd $GOPATH/github.com/devopsmi/daemon
go mod init
go mod tidy
go mod download
go mod vendor

STEP 2

package main

import (
	"context"
	"net/http"
	"os"
	"os/signal"
	"time"

	_ "github.com/devopsmi/daemon" //仅导入，包的init方法被自动调用，嵌入daemon功能
	"github.com/labstack/echo"
	"github.com/labstack/echo/middleware"
	"github.com/labstack/gommon/log"
)

func main() {
	// Setup
	e := echo.New()
	e.Use(middleware.CORS())
	e.Use(middleware.Recover())
	e.Logger.SetLevel(log.INFO)
	e.GET("/", func(c echo.Context) error {
		//time.Sleep(5 * time.Second)
		return c.JSON(http.StatusOK, "OK")
	})

	// Start server
	go func() {
		if err := e.Start(":8080"); err != nil {
			e.Logger.Info("shutting down the server")
		}
	}()

	// Wait for interrupt signal to gracefully shutdown the server with a timeout of 10 seconds.
	quit := make(chan os.Signal)
	signal.Notify(quit, os.Interrupt)
	<-quit
	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()
	if err := e.Shutdown(ctx); err != nil {
		e.Logger.Fatal(err)
	}
}