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StateMachine.go
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StateMachine.go
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package main
import (
"math"
"strconv"
//"fmt"
"time"
)
var sm *StateMachine
type log1 struct {
logIndex int
logTerm int
command []byte
}
type send struct {
peerId int
event interface{}
}
type LogStore struct {
Index int
Data []byte
}
//Timeout
type TimeoutEv struct {
time int
}
//global variable
var count int
type Alarm struct {
time int
}
type StateMachine struct {
id int // server id
status string
peers [4]int // other server ids
votedFor int
currentTerm int
commitIndex int
prevLogIndex int
prevLogTerm int
lastLogIndex int
lastLogTerm int
voteCount int
votenegCount int
voteReceived [6]int
nextIndex [6]int
matchIndex [6]int
currentLeader int
appendresCount int
appendIdresponse [6]int
log [200]log1
}
//AppendEntries Request
type AppendEntriesReqEv struct {
Term int
LeaderId int
PrevLogIndex int
PrevLogTerm int
Entries []byte
LeaderCommit int
}
//AppendEntries Response
type AppendEntriesRespEv struct {
Id int
Term int
Success bool
}
//var sm *StateMachine
//var ret =make([]interface{},1)
func (a *AppendEntriesReqEv) AppendReqHandlerF() []interface{} {
replyfalse := AppendEntriesRespEv{sm.id, sm.currentTerm, false}
replytrue := AppendEntriesRespEv{sm.id, sm.currentTerm, true}
var ret = make([]interface{}, 0)
if a.Term < sm.currentTerm {
ret = append(ret, send{a.LeaderId, replyfalse})
} else {
sm.currentLeader = a.LeaderId
if len(a.Entries) == 0 {
ret = append(ret, Alarm{150})
sm.currentTerm = a.Term
sm.votedFor = 0
if a.LeaderCommit > sm.commitIndex {
ret = append(ret, Commit{index: a.LeaderCommit, data: sm.log[a.LeaderCommit].command})
sm.commitIndex = a.LeaderCommit
}
} else {
if sm.lastLogIndex == a.PrevLogIndex && sm.lastLogTerm == a.PrevLogTerm {
// Delete all the log entries following sm.prevLogIndex
if len(sm.log[sm.lastLogIndex+1].command) != 0 {
for i := sm.lastLogIndex + 1; sm.log[i].logTerm != 0 && i < 100; i++ {
//fmt.Println("check2")
sm.log[i].logTerm = 0
}
}
sm.lastLogIndex++
sm.currentTerm = a.Term
sm.votedFor = 0
/* m:=sm.lastLogIndex
//Generate output action : LogStore(index, entries[])
//log[m].logIndex=sm.lastLogIndex
log[m].logIndex=m
log[m].logTerm=a.term
log[m].command=a.entries
*/
ret = append(ret, LogStore{sm.lastLogIndex, a.Entries})
if a.LeaderCommit > sm.commitIndex {
sm.commitIndex = int(math.Min(float64(a.LeaderCommit), float64(sm.lastLogIndex)))
}
ret = append(ret, send{a.LeaderId, replytrue})
//fmt.Println("check1")
} else if len(sm.log[a.PrevLogIndex].command) == 0 {
if a.PrevLogIndex == -1 {
// Generate the output action
for i := 0; sm.log[i].logTerm != 0 && i < 100; i++ {
sm.log[i].logTerm = 0
//log[i].command={}
}
ret = append(ret, LogStore{0, a.Entries})
sm.lastLogIndex = 0
ret = append(ret, send{a.LeaderId, replytrue})
} else {
ret = append(ret, send{a.LeaderId, replyfalse})
}
} else if (sm.lastLogIndex == a.PrevLogIndex) && (sm.lastLogTerm != a.PrevLogTerm) {
//Delete the existing entry and those that follows trying to make its log equivalent to that of leader
ret = append(ret, send{a.LeaderId, replyfalse})
}
}
}
time.Sleep(1 * time.Second)
//fmt.Println(ret)
return ret
}
func (ae *AppendEntriesReqEv) AppendReqHandlerC() []interface{} {
replyfalse := AppendEntriesRespEv{sm.id, sm.currentTerm, false}
var can = make([]interface{}, 0)
if ae.Term < sm.currentTerm {
can = append(can, send{ae.LeaderId, replyfalse})
} else {
sm.status = "follower"
sm.currentTerm = ae.Term
sm.votedFor = 0
if len(ae.Entries) == 0 {
can = append(can, send{ae.LeaderId, AppendEntriesRespEv{sm.id, sm.currentTerm, true}})
} else {
can = append(can, send{ae.LeaderId, AppendEntriesRespEv{sm.id, sm.currentTerm, false}})
}
}
return can
}
func (a *AppendEntriesReqEv) AppendReqHandlerL() []interface{} {
var lead = make([]interface{}, 0)
if sm.currentTerm <= a.Term {
lead = append(lead, send{a.LeaderId, AppendEntriesRespEv{sm.id, sm.currentTerm, false}})
return lead
} else {
sm.currentTerm = a.Term
sm.status = "follower"
sm.votedFor = 0
}
return (make([]interface{}, 0))
}
func (ar *AppendEntriesRespEv) AppendEntriesresF() []interface{} {
var ret6 = make([]interface{}, 0)
if ar.Term > sm.currentTerm {
sm.currentTerm = ar.Term
sm.votedFor = 0
}
ret6 = append(ret6, "ERROR_OCCURED")
return (ret6)
//return(make([]interface{},1))
}
func (ar *AppendEntriesRespEv) AppendEntriesresC() []interface{} {
var ret7 = make([]interface{}, 0)
if ar.Term > sm.currentTerm {
sm.currentTerm = ar.Term
sm.status = "follower"
sm.votedFor = 0
}
ret7 = append(ret7, "ERROR_OCCURED")
return (ret7)
}
func (ar *AppendEntriesRespEv) AppendEntriesresL() []interface{} {
// fmt.Println(ar.Id)
var aresp = make([]interface{}, 0)
if ar.Success == true {
sm.appendIdresponse[ar.Id] = 1
sm.appendresCount++
x := sm.nextIndex[ar.Id]
q := sm.log[x].command
sm.nextIndex[ar.Id]++
for i := 0; i < 6; i++ {
if x <= sm.matchIndex[i] {
count++
}
}
if count >= 3 {
aresp = append(aresp, Commit{index: x, data: q})
if sm.commitIndex < x {
sm.commitIndex = x
}
sm.matchIndex[ar.Id]++
count = 0
} else {
return (make([]interface{}, 0))
}
} else if ar.Success == false {
var prevx int
sm.nextIndex[ar.Id]--
x := sm.nextIndex[ar.Id]
//fmt.Println(x)
if prevx > 0 {
prevx = x - 1
}
aresp = append(aresp, send{ar.Id, AppendEntriesReqEv{Term: sm.currentTerm, PrevLogIndex: prevx, PrevLogTerm: sm.log[prevx].logTerm, Entries: sm.log[x].command, LeaderCommit: sm.commitIndex}})
}
time.Sleep(2 * time.Second)
return aresp
}
//AppendEv
type AppendEv struct {
data1 []byte
}
type Commit struct {
index int
data []byte
err string
}
func (ar *AppendEv) AppendF() []interface{} {
var ret2 = make([]interface{}, 0)
var k string
k = "redirect to leader"
//+ strconv.Itoa(sm.currentLeader)
//fmt.Println(ar)
ret2 = append(ret2, Commit{data: ar.data1, err: k})
return (ret2)
}
func (ar *AppendEv) AppendC() []interface{} {
var apc = make([]interface{}, 0)
var k string
k = "redirect to " + strconv.Itoa(sm.currentLeader)
apc = append(apc, Commit{data: ar.data1, err: k})
return (apc)
}
func (ar *AppendEv) AppendL() []interface{} {
var apc = make([]interface{}, 0)
sm.lastLogIndex++
sm.prevLogIndex++
sm.prevLogTerm = sm.log[sm.prevLogIndex].logTerm
sm.matchIndex[sm.id]++
sm.appendIdresponse[sm.id] = 1
apc = append(apc, LogStore{sm.lastLogIndex, ar.data1})
for i := 0; i < len(sm.peers); i++ {
sm.nextIndex[sm.peers[i]] = sm.lastLogIndex
apc = append(apc, send{sm.peers[i], AppendEntriesReqEv{Term: sm.currentTerm, LeaderId: sm.id, PrevLogIndex: sm.prevLogIndex, Entries: ar.data1, PrevLogTerm: sm.prevLogTerm, LeaderCommit: sm.commitIndex}})
}
return apc
}
func (t *TimeoutEv) timeoutHandlerF() []interface{} {
//fmt.Println("hello timeout")
sm.currentTerm++
sm.status = "candidate"
sm.voteReceived[sm.id] = 1
sm.voteCount++
sm.votedFor = 0
var ret3 = make([]interface{}, 0)
//fmt.Println(sm.currentTerm)
for i := 0; i < len(sm.peers); i++ {
ret3 = append(ret3, send{sm.peers[i], VoteRequestEv{Term: sm.currentTerm, LastLogIndex: sm.lastLogIndex, LastLogTerm: sm.lastLogTerm, CandidateId: sm.id}})
}
//fmt.Println(ret3)
ret3 = append(ret3, Alarm{t.time})
return (ret3)
}
func (t *TimeoutEv) timeoutHandlerC() []interface{} {
sm.currentTerm++
sm.votedFor = 0
sm.status = "candidate"
empty := [6]int{0, 0, 1, 0, 0, 0}
sm.voteReceived = empty
sm.voteCount = 1
var tout = make([]interface{}, 0)
for i := 0; i < len(sm.peers); i++ {
tout = append(tout, send{sm.peers[i], VoteRequestEv{sm.currentTerm, sm.lastLogIndex, sm.lastLogTerm, sm.id}})
}
tout = append(tout, Alarm{t.time})
return (tout)
}
func (t *TimeoutEv) timeoutHandlerL() []interface{} {
var tout = make([]interface{}, 0)
for i := 0; i < 4; i++ {
//fmt.Println(i)
tout = append(tout, send{sm.peers[i], AppendEntriesReqEv{Term: sm.currentTerm, LeaderId: sm.id, PrevLogIndex: sm.prevLogIndex, Entries: []byte{}, PrevLogTerm: sm.prevLogTerm, LeaderCommit: sm.commitIndex}})
}
return tout
}
//VoteRequest
type VoteRequestEv struct {
Term int
LastLogIndex int
LastLogTerm int
CandidateId int
}
func (rv *VoteRequestEv) VoterequestF() []interface{} {
var ret4 = make([]interface{}, 0)
if rv.Term < sm.currentTerm {
ret4 = append(ret4, send{rv.CandidateId, VoteRespEv{sm.id, sm.currentTerm, false}})
} else if rv.Term >= sm.currentTerm && (sm.votedFor == 0 || sm.votedFor == rv.CandidateId) && rv.LastLogIndex >= sm.lastLogIndex {
sm.currentTerm = rv.Term
sm.votedFor = rv.CandidateId
ret4 = append(ret4, send{rv.CandidateId, VoteRespEv{sm.id, sm.currentTerm, true}})
} else {
if rv.Term > sm.currentTerm {
sm.currentTerm = rv.Term
}
ret4 = append(ret4, send{rv.CandidateId, VoteRespEv{sm.id, sm.currentTerm, false}})
}
return (ret4)
return (make([]interface{}, 0))
}
func (rv *VoteRequestEv) VoterequestC() []interface{} {
var ret5 = make([]interface{}, 0)
if rv.Term < sm.currentTerm {
ret5 = append(ret5, send{rv.CandidateId, VoteRespEv{sm.id, sm.currentTerm, false}})
} else if rv.Term >= sm.currentTerm && (sm.votedFor == 0 || sm.votedFor == rv.CandidateId) && rv.LastLogIndex >= sm.lastLogIndex {
sm.currentTerm = rv.Term
sm.votedFor = rv.CandidateId
ret5 = append(ret5, send{rv.CandidateId, VoteRespEv{sm.id, sm.currentTerm, true}})
} else {
if rv.Term > sm.currentTerm {
sm.currentTerm = rv.Term
}
ret5 = append(ret5, send{rv.CandidateId, VoteRespEv{sm.id, sm.currentTerm, false}})
}
return (ret5)
//return(make([]interface{},1))
}
func (rv *VoteRequestEv) VoterequestL() []interface{} {
var ret5 = make([]interface{}, 0)
if rv.Term > sm.currentTerm {
sm.currentTerm = rv.Term
sm.status = "follower"
sm.votedFor = 0
empty1 := [6]int{0, 0, 1, 0, 0, 0}
sm.appendIdresponse = empty1
sm.appendresCount = 0
}
ret5 = append(ret5, "VOTE RESPONSE TOO LATE")
return ret5
}
//VoteResponse
type VoteRespEv struct {
Id int
Term int
VoteGranted bool
}
func (rvr *VoteRespEv) VoteResponseHandlerF() []interface{} {
if rvr.Term > sm.currentTerm {
sm.currentTerm = rvr.Term
sm.votedFor = 0
}
var ret5 = make([]interface{}, 0)
ret5 = append(ret5, "VOTE RESPONSE TOO LATE")
return ret5
}
func (rvr *VoteRespEv) VoteResponseHandlerC() []interface{} {
var vrhc = make([]interface{}, 0)
if rvr.VoteGranted == true {
sm.voteReceived[rvr.Id] = 1
sm.voteCount++
if sm.voteCount == 3 {
sm.status = "leader"
sm.currentLeader = sm.id
for i := 0; i < len(sm.peers); i++ {
vrhc = append(vrhc, send{sm.peers[i], AppendEntriesReqEv{Term: sm.currentTerm, LeaderId: sm.id, PrevLogIndex: sm.lastLogIndex, PrevLogTerm: sm.lastLogTerm, Entries: []byte{}}})
}
}
}
if rvr.VoteGranted == false {
sm.voteReceived[rvr.Id] = 0
sm.votenegCount++
if sm.votenegCount == 3 {
sm.status = "follower"
sm.votedFor = 0
}
if sm.currentTerm < rvr.Term {
sm.currentTerm = rvr.Term
}
}
return vrhc
return (make([]interface{}, 0))
}
func (rvr *VoteRespEv) VoteResponseHandlerL() []interface{} {
if rvr.Term > sm.currentTerm {
sm.currentTerm = rvr.Term
sm.status = "follower"
sm.votedFor = 0
empty2 := [6]int{0, 0, 1, 0, 0, 0}
sm.appendIdresponse = empty2
sm.appendresCount = 0
}
var ret5 = make([]interface{}, 0)
ret5 = append(ret5, "Error")
return ret5
}
//Process Event
func (sm1 *StateMachine) ProcessEvent(ev interface{}) []interface{} {
sm = sm1
switch ev.(type) {
case AppendEntriesReqEv:
cmd := ev.(AppendEntriesReqEv)
if sm1.status == "follower" {
return (cmd.AppendReqHandlerF())
} else if sm1.status == "candidate" {
return (cmd.AppendReqHandlerC())
} else if sm1.status == "leader" {
return (cmd.AppendReqHandlerL())
}
case AppendEntriesRespEv:
cmd := ev.(AppendEntriesRespEv)
if sm1.status == "follower" {
return (cmd.AppendEntriesresF())
} else if sm1.status == "candidate" {
return (cmd.AppendEntriesresC())
} else if sm1.status == "leader" {
return (cmd.AppendEntriesresL())
}
case VoteRequestEv:
cmd := ev.(VoteRequestEv)
if sm1.status == "follower" {
return (cmd.VoterequestF())
} else if sm1.status == "candidate" {
return (cmd.VoterequestC())
} else if sm1.status == "leader" {
return (cmd.VoterequestL())
}
// do stuff with req
//fmt.Printf("%v\n", cmd)
case VoteRespEv:
cmd := ev.(VoteRespEv)
//fmt.Println("Inside Vote Response")
//fmt.Println("Hello")
if sm1.status == "follower" {
return (cmd.VoteResponseHandlerF())
} else if sm1.status == "candidate" {
return (cmd.VoteResponseHandlerC())
} else if sm1.status == "leader" {
return (cmd.VoteResponseHandlerL())
}
case AppendEv:
cmd := ev.(AppendEv)
if sm1.status == "follower" {
return (cmd.AppendF())
} else if sm1.status == "candidate" {
return (cmd.AppendC())
} else if sm1.status == "leader" {
return (cmd.AppendL())
}
case TimeoutEv:
cmd := ev.(TimeoutEv)
if sm1.status == "follower" {
return (cmd.timeoutHandlerF())
} else if sm1.status == "candidate" {
return (cmd.timeoutHandlerC())
} else if sm1.status == "leader" {
//fmt.Println(cmd)
return (cmd.timeoutHandlerL())
}
// other cases
}
go func() []interface{} {
var hbmsg = make([]interface{}, 0)
if sm1.status == "leader" {
for i := 0; i < 4; i++ {
hbmsg = append(hbmsg, send{sm.peers[i], AppendEntriesReqEv{Term: sm.id, LeaderId: sm.id, LeaderCommit: sm.commitIndex, Entries: []byte{}, PrevLogIndex: sm.prevLogIndex, PrevLogTerm: sm.prevLogTerm}})
}
}
return hbmsg
}()
return (make([]interface{}, 1))
}