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member.go
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member.go
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package bft
import (
"bytes"
"errors"
"fmt"
"github.com/drep-project/DREP-Chain/crypto/secp256k1"
"github.com/drep-project/DREP-Chain/crypto/secp256k1/schnorr"
"github.com/drep-project/DREP-Chain/crypto/sha3"
consensusTypes "github.com/drep-project/DREP-Chain/pkgs/consensus/types"
"github.com/drep-project/binary"
"math/big"
"sync"
"time"
)
type Member struct {
leader *MemberInfo
producers []*MemberInfo
liveMembers []*MemberInfo
prvKey *secp256k1.PrivateKey
p2pServer Sender
msg IConsenMsg
msgHash []byte
randomPrivakey *secp256k1.PrivateKey
r *big.Int
waitTime time.Duration
completed chan struct{}
timeOutChanel chan struct{}
errorChanel chan error
cancelWaitSetUp chan struct{}
cancelWaitChallenge chan struct{}
currentState int
currentHeight uint64
stateLock sync.RWMutex
msgPool chan *MsgWrap
cancelPool chan struct{}
validator func(msg IConsenMsg) error
convertor func(msg []byte) (IConsenMsg, error)
}
func NewMember(prvKey *secp256k1.PrivateKey, p2pServer Sender, waitTime time.Duration, producers []*MemberInfo, minMember int, curHeight uint64, msgPool chan *MsgWrap) *Member {
member := &Member{}
member.prvKey = prvKey
member.waitTime = waitTime
member.p2pServer = p2pServer
member.msgPool = msgPool
member.producers = producers
member.currentHeight = curHeight
member.liveMembers = []*MemberInfo{}
for _, producer := range producers {
if producer.IsLeader {
member.leader = producer
} else {
if producer.IsMe {
//include self
member.liveMembers = append(member.liveMembers, producer)
} else {
if producer.IsOnline {
member.liveMembers = append(member.liveMembers, producer)
}
}
}
}
member.cancelPool = make(chan struct{})
member.Reset()
return member
}
func (member *Member) Reset() {
member.msg = nil
member.msgHash = nil
member.randomPrivakey = nil
member.cancelPool = make(chan struct{})
member.errorChanel = make(chan error, 1)
member.completed = make(chan struct{}, 1)
member.cancelWaitSetUp = make(chan struct{}, 1)
member.timeOutChanel = make(chan struct{}, 1)
member.cancelWaitChallenge = make(chan struct{}, 1)
member.setState(INIT)
}
func (member *Member) ProcessConsensus(round int, chNewBlock <-chan uint64) (IConsenMsg, error) {
defer func() {
member.cancelPool <- struct{}{}
}()
log.WithField("Node", member.leader.Peer.IP()).WithField("height", member.currentHeight).
WithField("round", round).Debug("wait for leader's setup message")
member.setState(WAIT_SETUP)
go member.WaitSetUp(round, chNewBlock)
go member.processP2pMessage(round)
select {
case err := <-member.errorChanel:
log.WithField("Reason", err).WithField("height", member.currentHeight).
WithField("round", round).Error("member consensus fail")
return nil, err
case <-member.timeOutChanel:
log.WithField("timeout", "member timeout").WithField("height", member.currentHeight).
WithField("round", round).Error("member consensus fail")
member.setState(ERROR)
return nil, ErrTimeout
case <-member.completed:
member.setState(COMPLETED)
return member.msg, nil
}
}
func (member *Member) processP2pMessage(round int) {
for {
select {
case msg := <-member.msgPool:
switch msg.Code {
case MsgTypeSetUp:
var setup Setup
if err := binary.Unmarshal(msg.Msg, &setup); err != nil {
log.Debugf("setup msg:%v err:%v", msg, err)
continue
}
log.WithField("height", setup.Height).WithField("come round", setup.Round).WithField("local round", round).Trace("member process setup")
if setup.Round != round {
log.WithField("come round", setup.Round).WithField("local round", round).Trace("member process setup err")
continue
}
go member.OnSetUp(msg.Peer, &setup)
case MsgTypeChallenge:
var challenge Challenge
if err := binary.Unmarshal(msg.Msg, &challenge); err != nil {
log.Debugf("challenge msg:%v err:%v", msg, err)
continue
}
log.WithField("height", challenge.Height).WithField("come round", challenge.Round).WithField("local round", round).Trace("member process challege")
if challenge.Round != round {
log.WithField("come round", challenge.Round).WithField("local round", round).Trace("member process challege err")
continue
}
go member.OnChallenge(msg.Peer, &challenge)
//case MsgTypeFail:
// var fail Fail
// if err := binary.Unmarshal(msg.Msg, &fail); err != nil {
// log.Debugf("challenge msg:%v err:%v", msg, err)
// continue
// }
//
// log.WithField("height", fail.Height).WithField("come round", fail.Round).WithField("local round", round).Trace("member process")
//
// if fail.Round != round {
// log.WithField("come round", fail.Round).WithField("local round", round).Trace("member process fail")
// continue
// }
//
// if fail.Height != member.currentHeight {
// log.WithField("fai height", fail.Height).WithField("mem currentHeight", member.currentHeight).
// Trace("member process fail")
// continue
// }
//
// go member.OnFail(msg.Peer, &fail)
}
case <-member.cancelPool:
return
}
}
}
func (member *Member) WaitSetUp(round int, chNewBlock <-chan uint64) {
tm := time.NewTimer(member.waitTime)
defer tm.Stop()
for {
select {
case <-tm.C:
log.Debug("wait setup message timeout")
member.setState(WAIT_SETUP_TIMEOUT)
select {
case member.timeOutChanel <- struct{}{}:
default:
}
return
case <-member.cancelWaitSetUp:
return
case bestHeight := <-chNewBlock:
if member.currentHeight < bestHeight {
member.errorChanel <- fmt.Errorf("may be local currentheight err")
return
}
}
}
}
func (member *Member) OnSetUp(peer consensusTypes.IPeerInfo, setUp *Setup) {
if member.currentHeight < setUp.Height {
log.WithField("Receive Height", setUp.Height).
WithField("Current Height", member.currentHeight).
WithField("Status", member.getState()).
Debug("setup low height")
return
} else if member.currentHeight > setUp.Height {
log.WithField("Receive Height", setUp.Height).
WithField("Current Height", member.currentHeight).
WithField("Status", member.getState()).
Debug("setup high height")
return
}
if member.getState() != WAIT_SETUP {
log.WithField("Receive Height", setUp.Height).
WithField("Current Height", member.currentHeight).
WithField("Status", member.getState()).
Debug("setup error status")
return
}
if member.leader.Peer.Equal(peer) {
var err error
member.msg, err = member.convertor(setUp.Msg)
if err != nil || member.msg == nil {
log.Errorf("convertor msg to block err:%s,height:%v,magic:0x%x,msg:%s", err.Error(), setUp.Height, setUp.Magic, setUp.String())
return
}
member.msgHash = sha3.Keccak256(member.msg.AsSignMessage())
member.commit(setUp.Round)
log.Debug("sent commit message to leader")
member.setState(WAIT_CHALLENGE)
go member.WaitChallenge()
select {
case member.cancelWaitSetUp <- struct{}{}:
default:
}
} else {
log.Errorf("leader peer id:%s,ip:%s != peer:%s,ip:%s", member.leader.Peer.ID(), member.leader.Peer.IP(), peer.ID(), peer.IP())
//check fail not response and start new round
member.pushErrorMsg(ErrLeaderMistake)
}
}
func (member *Member) WaitChallenge() {
tm := time.NewTimer(member.waitTime)
defer tm.Stop()
select {
case <-tm.C:
member.setState(WAIT_CHALLENGE_TIMEOUT)
select {
case member.timeOutChanel <- struct{}{}:
default:
}
return
case <-member.cancelWaitChallenge:
return
}
}
func (member *Member) OnChallenge(peer consensusTypes.IPeerInfo, challengeMsg *Challenge) {
if member.currentHeight < challengeMsg.Height {
log.WithField("Receive Height", challengeMsg.Height).
WithField("Current Height", member.currentHeight).
WithField("Status", member.getState()).
Debug("challenge high height")
return
} else if member.currentHeight > challengeMsg.Height {
log.WithField("Receive Height", challengeMsg.Height).
WithField("Current Height", member.currentHeight).
WithField("Status", member.getState()).
Debug("challenge high height")
return
}
if member.getState() != WAIT_CHALLENGE {
log.WithField("Receive Height", challengeMsg.Height).
WithField("Current Height", member.currentHeight).
WithField("Status", member.getState()).
Debug("challenge error status")
return
}
log.Debug("recieved challenge message")
if member.leader.Peer.Equal(peer) && bytes.Equal(member.msgHash, challengeMsg.R) {
member.response(challengeMsg)
log.Debug("response has sent")
member.setState(COMPLETED)
select {
case member.cancelWaitChallenge <- struct{}{}:
default:
}
member.completed <- struct{}{}
return
}
member.pushErrorMsg(ErrChallenge)
//check fail not response and start new round
}
func (member *Member) OnFail(peer consensusTypes.IPeerInfo, failMsg *Fail) {
if member.currentHeight < failMsg.Height || member.getState() == COMPLETED || member.getState() == ERROR {
return
}
log.WithField("msg", failMsg.Reason).Error("member receive leader's err message")
member.pushErrorMsg(errors.New(failMsg.Reason))
}
func (member *Member) commit(round int) {
if err := member.validator(member.msg); err != nil {
log.WithField("Reason", err).Error("member check msg fail")
member.pushErrorMsg(ErrValidateMsg)
return
}
var err error
var nouncePk *secp256k1.PublicKey
member.randomPrivakey, nouncePk, err = schnorr.GenerateNoncePair(secp256k1.S256(), member.msgHash, member.prvKey, nil, schnorr.Sha256VersionStringRFC6979)
if err != nil {
member.pushErrorMsg(ErrGenerateNouncePriv)
return
}
commitment := &Commitment{
Round: round,
Magic: CommitMagic,
BpKey: member.prvKey.PubKey(),
Q: (*secp256k1.PublicKey)(nouncePk),
}
commitment.Height = member.currentHeight
member.p2pServer.SendAsync(member.leader.Peer.GetMsgRW(), MsgTypeCommitment, commitment)
}
func (member *Member) response(challengeMsg *Challenge) {
if bytes.Equal(member.msgHash, challengeMsg.R) {
sig, err := schnorr.PartialSign(secp256k1.S256(), member.msgHash, member.prvKey, member.randomPrivakey, challengeMsg.SigmaQ)
if err != nil {
log.WithField("msg", err).Error("sign chanllenge error ")
return
}
response := &Response{S: sig.Serialize()}
response.BpKey = member.prvKey.PubKey()
response.Height = member.currentHeight
response.Magic = ResponseMagic
response.Round = challengeMsg.Round
member.p2pServer.SendAsync(member.leader.Peer.GetMsgRW(), MsgTypeResponse, response)
} else {
log.Error("commit messsage and chanllenge message not matched")
}
}
/*
func (member *Member) getLiveMembers() []*consensusTypes.MemberInfo{
return member.liveMembers
}
*/
func (member *Member) setState(state int) {
member.stateLock.Lock()
defer member.stateLock.Unlock()
member.currentState = state
}
func (member *Member) getState() int {
member.stateLock.RLock()
defer member.stateLock.RUnlock()
return member.currentState
}
func (member *Member) pushErrorMsg(msg error) {
member.setState(ERROR)
CANCEL:
for {
select {
case member.errorChanel <- msg:
case member.cancelWaitSetUp <- struct{}{}:
case member.cancelWaitChallenge <- struct{}{}:
default:
break CANCEL
}
}
}