// raftEventLogger converts events from the Raft server into log messages.
func (s *PeerServer) raftEventLogger(event raft.Event) {
value := event.Value()
prevValue := event.PrevValue()
if value == nil {
value = "<nil>"
}
if prevValue == nil {
prevValue = "<nil>"
}
switch event.Type() {
case raft.StateChangeEventType:
log.Infof("%s: state changed from '%v' to '%v'.", s.Config.Name, prevValue, value)
case raft.TermChangeEventType:
log.Infof("%s: term #%v started.", s.Config.Name, value)
case raft.LeaderChangeEventType:
log.Infof("%s: leader changed from '%v' to '%v'.", s.Config.Name, prevValue, value)
case raft.AddPeerEventType:
log.Infof("%s: peer added: '%v'", s.Config.Name, value)
case raft.RemovePeerEventType:
log.Infof("%s: peer removed: '%v'", s.Config.Name, value)
case raft.HeartbeatIntervalEventType:
var name = "<unknown>"
if peer, ok := value.(*raft.Peer); ok {
name = peer.Name
}
log.Infof("%s: warning: heartbeat timed out: '%v'", s.Config.Name, name)
case raft.ElectionTimeoutThresholdEventType:
select {
case s.timeoutThresholdChan <- value:
default:
}
}
}
func (s *PeerServer) recordMetricEvent(event raft.Event) {
name := fmt.Sprintf("raft.event.%s", event.Type())
value := event.Value().(time.Duration)
(*s.metrics).Timer(name).Update(value)
}