Package ghttp provides a graceful shutdown and restart for Go.

Just use ghttp.ListenAndServe instead of http.ListenAndServe.
Send SIGUSR2 signal to a go process that is using ghttp in order to graceful restart and send SIGTERM in order to graceful shutdown.

package main

import (
    "fmt"
    "github.com/justgolang/ghttp"
    "net/http"
)

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        fmt.Fprintf(w, "hello world")
    })

    err := ghttp.ListenAndServe(":8989", nil)
    if err != nil {
        fmt.Println(err)
    }
}

go get github.com/justgolang/ghttp
use go get -u to update the package.