Function RegisterCleaner

util/interrupt/cleaner.go:31–65

RegisterCleaner is responsible for registering a cleaner function. When a function is registered, the Signal watcher is started in a goroutine.

(cleaner CleanerFunc)

// RegisterCleaner is responsible for registering a cleaner function.
// When a function is registered, the Signal watcher is started in a goroutine.
func RegisterCleaner(cleaner CleanerFunc) CancelFunc {
	mu.Lock()
	defer mu.Unlock()

	w := &wrapper{f: cleaner}

	cancel := func() {
		mu.Lock()
		defer mu.Unlock()
		w.disabled = true
	}

	// prepend to later execute then in reverse order
	cleaners = append([]*wrapper{w}, cleaners...)

	if handlerCreated {
		return cancel
	}

	handlerCreated = true
	go func() {
		ch := make(chan os.Signal, 1)
		signal.Notify(ch, syscall.SIGINT, syscall.SIGTERM, os.Interrupt)
		<-ch
		// Prevent un-terminated ^C character in terminal
		fmt.Println()
		errl := clean()
		for _, err := range errl {
			_, _ = fmt.Fprintln(os.Stderr, err)
		}
		os.Exit(1)
	}()

	return cancel
}

// clean invokes all registered cleanup functions, and returns a list of errors, if they exist.
func clean() (errorList []error) {