Method IsValid

nats.go:5046–5053

IsValid returns a boolean indicating whether the subscription is still active. This will return false if the subscription has already been closed.

()

// is still active. This will return false if the subscription has
// already been closed.
func (s *Subscription) IsValid() bool {
	if s == nil {
		return false
	}
	s.mu.Lock()
	defer s.mu.Unlock()
	return s.conn != nil && !s.closed
}

// Drain will remove interest but continue callbacks until all messages
// have been processed.