shutdown

var Shutdown = sync.OnceFunc(func() {
	logger.Infof("begin shutdown")

	registryLock.Lock()
	tasks := shutdownTasks
	shutdownTasks = nil
	registryLock.Unlock()

	sort.SliceStable(tasks, func(i, j int) bool {
		return tasks[i].Priority < tasks[j].Priority
	})

	for _, task := range tasks {
		if task.Hook == nil {
			continue
		}
		logger.Infof("shutting down: %s", task.Label)

		s := time.Now()
		task.Hook()
		logger.Infof("shutdown %s completed in %v", task.Label, time.Since(s))
	}
})