// sendUserEvent is used to send a single user event
func (es *eventStream) sendUserEvent(ue serf.UserEvent) error {
	header := responseHeader{
		Seq:   es.seq,
		Error: "",
	}
	rec := userEventRecord{
		Event:    ue.EventType().String(),
		LTime:    ue.LTime,
		Name:     ue.Name,
		Payload:  ue.Payload,
		Coalesce: ue.Coalesce,
	}
	return es.client.Send(&header, &rec)
}

// localEvent is called when we receive an event on the local Serf
func (c *Client) localEvent(event serf.UserEvent) {
	// Handle only consul events
	if !strings.HasPrefix(event.Name, "consul:") {
		return
	}

	switch name := event.Name; {
	case name == newLeaderEvent:
		c.logger.Printf("[INFO] consul: New leader elected: %s", event.Payload)

		// Trigger the callback
		if c.config.ServerUp != nil {
			c.config.ServerUp()
		}
	case isUserEvent(name):
		event.Name = rawUserEventName(name)
		c.logger.Printf("[DEBUG] consul: user event: %s", event.Name)

		// Trigger the callback
		if c.config.UserEventHandler != nil {
			c.config.UserEventHandler(event)
		}
	default:
		c.logger.Printf("[WARN] consul: Unhandled local event: %v", event)
	}
}

// handleUserEvent is called when a user event is received from both local and remote nodes.
func (s *SerfEventHandler) handleUserEvent(event serf.UserEvent) {
	switch name := event.Name; {

	// Handles leader election events
	case s.IsLeaderEvent(name):
		s.Logger.Info("serfer: New leader elected: %s", event.Payload)

		// Process leader election event
		if s.LeaderElectionHandler != nil {
			s.LeaderElectionHandler.HandleLeaderElection(event)
		}

	// Handle service events
	case s.isServiceEvent(name):
		event.Name = s.getRawEventName(name)
		s.Logger.Debug("serfer: user event: %s", event.Name)

		// Process user event
		if s.UserEvent != nil {
			s.UserEvent.HandleUserEvent(event)
		}

	// Handle unknown user events
	default:
		s.Logger.Warn("serfer: unknown event: %v", event)

		// Process unknown event
		if s.UnknownEventHandler != nil {
			s.UnknownEventHandler.HandleUnknownEvent(event)
		}
	}
}