// most every given duration.
func NewAtMostEvery(delay time.Duration) *AtMostEvery {
	return &AtMostEvery{
		delay: delay,
	}
}

// updateLastCall returns true if the lastCall time has been updated,
// false if it was too early.
func (s *AtMostEvery) updateLastCall() bool {
	s.mutex.Lock()
	defer s.mutex.Unlock()
	if time.Since(s.lastCall) < s.delay {
		return false
	}
	s.lastCall = time.Now()
	return true
}