partial implementation of ClientAppend of leader

assignment3/src/raft/raft.go

@@ -58,7 +58,7 @@ type ClusterConfig struct {
 }
 
 type ClientAppend struct {
-	logEntry LogEntry
+	logEntry *LogEntry
 }
 
 type VoteRequest struct {
@@ -103,6 +103,10 @@ type Raft struct {
 	voters         int
 	monitorVotesCh chan bool
 	et             *time.Timer
+	isLeader       bool
+	lastApplied    int
+	nextIndex      []int
+	matchIndex     []int
 }
 
 // Log entry interface
@@ -184,6 +188,9 @@ func NewRaft(config *ClusterConfig, thisServerId int, commitCh chan LogEntry, ev
 	}
 	rft.monitorVotesCh = monitorVotesCh
 	getSingleDataFromFile(VOTED_FOR, thisServerId, rft.Info) //initialize the votedFor file.
+	rft.isLeader = false
+	rft.nextIndex = make([]int, len(config.Servers))
+	rft.matchIndex = make([]int, len(config.Servers))
 	return rft, nil
 }
 
@@ -293,9 +300,10 @@ func (rft *Raft) grantVote(reply bool, currentTerm int) {
 	if reply {
 		rft.voters++
 		rft.Info.Println(rft.id, "got vote")
-		if rft.voters > len(rafts)/2 {
+		if !rft.isLeader && rft.voters > len(rafts)/2 {
 			rft.LogC("got majority")
 			rft.monitorVotesCh <- true
+			rft.isLeader = true
 		}
 	}
 }
@@ -474,6 +482,11 @@ func (rft *Raft) leader() int {
 	heartbeatReq := new(AppendRPC)
 	heartbeatReq.entries = []*LogEntryData{}
 	heartbeatReq.leaderId = rft.id
+	//reintialize nextIndex and matchIndex
+	for i := 0; i < len(rft.nextIndex); i++ {
+		rft.nextIndex[i] = len(rft.LogArray)
+		rft.matchIndex[i] = 0
+	}
 
 	for {
 		select {
@@ -489,6 +502,12 @@ func (rft *Raft) leader() int {
 		case event := <-rft.eventCh:
 			switch event.(type) {
 			case *ClientAppend:
+				//write data to log
+				rft.LogL("got client data")
+				entry := event.(*ClientAppend).logEntry
+				rft.LogArray = append(rft.LogArray, entry)
+				//todo:apply to state machine
+				//todo:respond to client
 
 			case *AppendRPC: