nsq main里面golang多个协程管理写法

package main

import (
	"fmt"
	"net/http"
	"sync"
)

type WaitGroupWrapper struct {
	sync.WaitGroup
}

func (w *WaitGroupWrapper) Wrap(cb func()) {
	w.Add(1)
	go func() {
		cb()
		w.Done()
	}()
}

func HelloHandler(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintf(w, "Hello World")
}

func ListenAndServe() error {
	http.HandleFunc("/", HelloHandler)
	http.ListenAndServe(":8000", nil)
	return nil
}

func main() {

	exitCh := make(chan error)

	var once sync.Once
	exitFunc := func(err error) {
		once.Do(func() {
			if err != nil {
				fmt.Printf("ERR: %s", err)
			}
			exitCh <- err
		})
	}

	var wg WaitGroupWrapper
	wg.Wrap(func() {
		exitFunc(ListenAndServe())
	})

	err := <- exitCh
	fmt.Printf("main end err:%v
", err)
}