func (rn *RaftNode) Append(data []byte) {
rn.smRequestChan <- raftsm.CreateEvent("Append", "data", data)
}
func CreateRaftNode(conf Config) (*RaftNode, error) {
rn := new(RaftNode)
rn.id = conf.Id
//rn.leaderId = 0 //? 0 is invalid
rn.commitIndex = 0 //?verify
rnlog, err := log.Open(conf.LogDir)
if err != nil {
return nil, err
}
rn.rnlog = rnlog
rn.rnlog.RegisterSampleEntry(raftsm.LogEntry{})
if rn.rnlog.GetLastIndex() == -1 {
rn.rnlog.Append(raftsm.LogEntry{0, nil, false})
}
rn.server, err = GetServer(int(conf.Id), conf.Cluster)
if err != nil {
return nil, err
}
//--Init State Machine ---
peerIds := make([]uint64, 0)
for _, e := range conf.Cluster {
if e.Id != conf.Id {
peerIds = append(peerIds, e.Id)
}
}
rn.majority = uint64(math.Ceil(float64(len(conf.Cluster)) / 2.0)) //? Assumes len is always odd
rn.statefile = conf.LogDir + "/TermVotedFor" //? change required
data, err := ioutil.ReadFile(rn.statefile)
if err != nil {
tvf := TermVotedFor{0, 0}
data, err := json.Marshal(tvf)
if err != nil {
return nil, err
}
err = ioutil.WriteFile(rn.statefile, data, 0777)
if err != nil {
return nil, err
}
rn.currentTerm = 0
rn.votedFor = 0
} else {
var tvf TermVotedFor
err = json.Unmarshal(data, &tvf)
if err != nil {
return nil, err
}
rn.currentTerm = tvf.CurrentTerm
rn.votedFor = tvf.VotedFor
}
rn.logIndex = uint64(rn.rnlog.GetLastIndex()) + 1
rn.sm = raftsm.InitStateMachine(conf.Id, peerIds, rn.majority, time.Duration(conf.ElectionTimeout)*time.Millisecond, time.Duration(conf.HeartbeatTimeout)*time.Millisecond, rn.currentTerm, rn.votedFor /*//?*/, rn.rnlog)
rn.smAlarmChan = *rn.sm.GetAlarmChannel()
rn.smCommitChan = *rn.sm.GetCommitChannel()
rn.smSaveChan = *rn.sm.GetSaveChannel()
rn.smSendChan = *rn.sm.GetSendChannel()
rn.smTimeoutChan = *rn.sm.GetTimeoutChannel()
rn.smResponseChan = *rn.sm.GetResponseChannel()
rn.smRequestChan = *rn.sm.GetRequestChannel()
rn.commitChan = make(chan CommitInfo, 1000)
rn.stopChan = make(chan int, 2)
rn.timer = time.AfterFunc(100000*time.Second, func() {
//fmt.Println(rn.id,": timeout at:",time.Now())
rn.smTimeoutChan <- raftsm.CreateEvent("Timeout")
})
rn.timer.Stop()
gob.Register(raftsm.Event{})
return rn, nil
}