golang 函數超時處理

func WithTimeout(dur time.Duration, fn func() error) error {
	var ch = make(chan error, 1)
	go time.AfterFunc(dur, func() {
		ch <- errors.New("函數執行超時: " + pkg.Caller.FromFunc(reflect.ValueOf(fn)))
	})
	go func() {
		defer func() {
			if err := recover(); err != nil {
				switch err.(type) {
				case error:
					ch <- err.(error)
				default:
					log.Fatalln(err)
				}
			}
		}()
		ch <- fn()
	}()

	return <-ch
}