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leader.go
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leader.go
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package bft
import (
"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"
)
const (
INIT = iota
WAIT_SETUP
WAIT_SETUP_TIMEOUT
WAIT_COMMIT
WAIT_COMMIT_COMPELED
WAIT_COMMIT_IMEOUT
WAIT_CHALLENGE
WAIT_CHALLENGE_TIMEOUT
WAIT_RESPONSE
WAIT_RESPONSE_COMPELED
WAIT_RESPONSE_TIMEOUT
COMPLETED
ERROR
)
type Leader struct {
producers []*MemberInfo
liveMembers []*MemberInfo
pubkey *secp256k1.PublicKey
privakey *secp256k1.PrivateKey
randomPrivakey *secp256k1.PrivateKey
commitKey *secp256k1.PublicKey
sender Sender
commitBitmap []byte
sigmaPubKey []*secp256k1.PublicKey
sigmaCommitPubkey []*secp256k1.PublicKey
msgHash []byte
sigmaS *schnorr.Signature
responseBitmap []byte
syncLock sync.Mutex
msgPool chan *MsgWrap
cancelPool chan struct{}
waitTime time.Duration
currentHeight uint64
minMember int
currentState int
stateLock sync.RWMutex
cancelWaitCommit chan struct{}
cancelWaitChallenge chan struct{}
}
func NewLeader(privkey *secp256k1.PrivateKey, p2pServer Sender, waitTime time.Duration, producers []*MemberInfo, minMember int, curHeight uint64, msgPool chan *MsgWrap) *Leader {
l := &Leader{}
l.pubkey = privkey.PubKey()
l.privakey = privkey
l.waitTime = waitTime
l.sender = p2pServer
l.msgPool = msgPool
l.producers = producers
l.minMember = minMember
l.currentHeight = curHeight
l.liveMembers = []*MemberInfo{}
for _, producer := range producers {
if producer.IsOnline && !producer.IsLeader {
l.liveMembers = append(l.liveMembers, producer)
}
}
l.cancelPool = make(chan struct{})
l.Reset()
return l
}
func (leader *Leader) Reset() {
leader.sigmaPubKey = nil
leader.sigmaCommitPubkey = nil
leader.sigmaS = nil
leader.randomPrivakey = nil
length := len(leader.producers)
leader.commitBitmap = make([]byte, length)
leader.responseBitmap = make([]byte, length)
leader.cancelWaitCommit = make(chan struct{})
leader.cancelWaitChallenge = make(chan struct{})
}
func (leader *Leader) Close() {
close(leader.cancelWaitCommit)
close(leader.cancelWaitChallenge)
}
/*
leader member
setup ----->
<----- commit
challenge ----->
<----- response
*/
func (leader *Leader) ProcessConsensus(msg IConsenMsg, round int, chBestHeight <-chan uint64) (error, *secp256k1.Signature, []byte) {
defer func() {
leader.cancelPool <- struct{}{}
}()
leader.setState(INIT)
go leader.processP2pMessage(round)
leader.setUp(msg, round)
if !leader.waitForCommit(round, chBestHeight) {
//send reason and reset
leader.fail(ErrWaitCommit.Error(), round)
return ErrWaitCommit, nil, nil
}
leader.challenge(msg, round)
if !leader.waitForResponse() {
//send reason and reset
leader.fail("waitForResponse fail", round)
return ErrWaitResponse, nil, nil
}
log.Debug("response complete")
valid := leader.Validate(msg, leader.sigmaS.R, leader.sigmaS.S)
log.WithField("VALID", valid).Debug("vaidate result")
if !valid {
leader.fail("signature not valid", round)
return ErrSignatureNotValid, nil, nil
}
return nil, &secp256k1.Signature{R: leader.sigmaS.R, S: leader.sigmaS.S}, leader.responseBitmap
}
func (leader *Leader) processP2pMessage(round int) {
for {
select {
case msg := <-leader.msgPool:
switch msg.Code {
case MsgTypeCommitment:
var req Commitment
if err := binary.Unmarshal(msg.Msg, &req); err != nil {
log.Debugf("commit msg:%v err:%v", msg, err)
continue
}
log.WithField("height", req.Height).WithField("come round", req.Round).
WithField("local round", round).Info("leader process msg req")
if req.Round != round {
log.WithField("come round", req.Round).WithField("local round", round).
Info("leader process msg req err")
continue
}
leader.OnCommit(msg.Peer, &req)
case MsgTypeResponse:
var res Response
if err := binary.Unmarshal(msg.Msg, &res); err != nil {
log.Debugf("response msg:%v err:%v", msg, err)
continue
}
log.WithField("height", res.Height).WithField("come round", res.Round).
WithField("local round", round).Info("leader process msg res err")
if res.Round != round {
log.WithField("come round", res.Round).WithField("local round", round).
Info("leader process msg res err")
continue
}
leader.OnResponse(msg.Peer, &res)
}
case <-leader.cancelPool:
return
}
}
}
func (leader *Leader) setUp(msg IConsenMsg, round int) {
setup := &Setup{Msg: msg.AsMessage()}
setup.Height = leader.currentHeight
setup.Magic = SetupMagic
setup.Round = round
leader.msgHash = sha3.Keccak256(msg.AsSignMessage())
var err error
var nouncePk *secp256k1.PublicKey
leader.randomPrivakey, nouncePk, err = schnorr.GenerateNoncePair(secp256k1.S256(), leader.msgHash, leader.privakey, nil, schnorr.Sha256VersionStringRFC6979)
leader.sigmaPubKey = []*secp256k1.PublicKey{leader.pubkey}
leader.sigmaCommitPubkey = []*secp256k1.PublicKey{nouncePk}
for i, v := range leader.producers {
if v.Producer.Pubkey.IsEqual(leader.pubkey) {
leader.commitBitmap[i] = 1
}
}
if err != nil {
log.WithField("msg", err).Error("generate private key error")
return
}
for _, member := range leader.liveMembers {
if member.Peer != nil && !member.IsMe {
log.WithField("Node", member.Peer.IP()).WithField("Height", setup.Height).WithField("size", len(setup.Msg)).Trace("leader sent setup message")
leader.sender.SendAsync(member.Peer.GetMsgRW(), MsgTypeSetUp, setup)
}
}
}
func (leader *Leader) OnCommit(peer consensusTypes.IPeerInfo, commit *Commitment) {
leader.syncLock.Lock()
defer leader.syncLock.Unlock()
if leader.getState() != WAIT_COMMIT {
log.WithField("current status", leader.getState()).WithField("receive message", commit).Debug("wrong commit message state")
return
}
if leader.currentHeight != commit.Height {
log.WithField("current height", leader.currentHeight).WithField("receive message", commit).Debug("wrong commit message state")
return
}
leader.sigmaPubKey = append(leader.sigmaPubKey, commit.BpKey)
leader.sigmaCommitPubkey = append(leader.sigmaCommitPubkey, commit.Q)
leader.markCommit(peer)
commitNum := leader.getCommitNum()
if commitNum >= leader.minMember {
leader.setState(WAIT_COMMIT_COMPELED)
log.WithField("commitNum", commitNum).WithField("producers", len(leader.producers)).Debug("OnCommit finish")
select {
case leader.cancelWaitCommit <- struct{}{}:
default:
}
}
}
func (leader *Leader) waitForCommit(round int, chNewBlock <-chan uint64) bool {
leader.setState(WAIT_COMMIT)
t := time.Now()
tm := time.NewTimer(leader.waitTime)
defer tm.Stop()
tmCheckNewBock := time.NewTicker(time.Millisecond * 500)
defer tmCheckNewBock.Stop()
for {
select {
case <-tm.C:
commitNum := leader.getCommitNum()
log.WithField("commitNum", commitNum).WithField("producers", len(leader.producers)).Debug("waitForCommit finish")
log.WithField("start", t).WithField("now", time.Now()).WithField("round", round).Info("wait for commit timeout")
if commitNum >= leader.minMember {
return true
}
leader.setState(WAIT_COMMIT_IMEOUT)
return false
case <-leader.cancelWaitCommit:
log.Info("cancelWaitCommit closed...., waitForCommit leader")
return true
case height := <-chNewBlock:
//需要创建的块已经到来,说明本地的数据信息错误,结束本次出块等待
if leader.currentHeight < height {
return true
}
}
}
}
func (leader *Leader) OnResponse(peer consensusTypes.IPeerInfo, response *Response) {
leader.syncLock.Lock()
defer leader.syncLock.Unlock()
if leader.getState() != WAIT_RESPONSE {
log.WithField("current status", leader.getState()).WithField("receive message", response).Debug("wrong response message state")
return
}
if leader.currentHeight != response.Height {
log.WithField("current height", leader.currentHeight).WithField("receive message", response).Debug("wrong response message height")
return
}
sig, err := schnorr.ParseSignature(response.S)
if err != nil {
return
}
sigmaS, err := schnorr.CombineSigs(secp256k1.S256(), []*schnorr.Signature{leader.sigmaS, sig})
if err != nil {
log.WithField("reason", err).Debug("schnorr combineSigs error")
return
} else {
leader.sigmaS = sigmaS
leader.markResponse(peer)
}
responseNum := leader.getResponseNum()
if responseNum == len(leader.sigmaPubKey) {
leader.setState(WAIT_RESPONSE_COMPELED)
log.WithField("responseNum", responseNum).WithField("producers", len(leader.producers)).Debug("OnResponse finish")
select {
case leader.cancelWaitChallenge <- struct{}{}:
default:
return
}
}
}
func (leader *Leader) challenge(msg IConsenMsg, Round int) {
leader.selfSign(msg)
for index, pk := range leader.sigmaPubKey {
if index == 0 {
continue
}
particateCommitPubkeys := []*secp256k1.PublicKey{}
particateCommitPubkeys = append(particateCommitPubkeys, leader.sigmaCommitPubkey[0:index]...)
particateCommitPubkeys = append(particateCommitPubkeys, leader.sigmaCommitPubkey[index+1:]...)
commitPubkey := schnorr.CombinePubkeys(particateCommitPubkeys)
challenge := &Challenge{
Height: leader.currentHeight,
Magic: ChallegeMagic,
Round: Round,
SigmaQ: commitPubkey,
R: leader.msgHash,
}
member := leader.getMemberByPk(pk)
if member != nil && member.IsOnline && !member.IsMe {
log.WithField("Node", member.Peer.IP()).WithField("Height", leader.currentHeight).Debug("leader sent challenge message")
leader.sender.SendAsync(member.Peer.GetMsgRW(), MsgTypeChallenge, challenge)
}
}
}
func (leader *Leader) selfSign(msg IConsenMsg) error {
// pk1 | pk2 | pk3 | pk4
commitPubkey := schnorr.CombinePubkeys(leader.sigmaCommitPubkey[1:])
sig, err := schnorr.PartialSign(secp256k1.S256(), leader.msgHash, leader.privakey, leader.randomPrivakey, commitPubkey)
if err != nil {
return err
}
leader.sigmaS = sig
for i, v := range leader.producers {
if v.Producer.Pubkey.IsEqual(leader.pubkey) {
leader.responseBitmap[i] = 1
}
}
return nil
}
func (leader *Leader) fail(msg string, round int) {
CANCEL:
for {
select {
case leader.cancelWaitChallenge <- struct{}{}:
case leader.cancelWaitCommit <- struct{}{}:
default:
break CANCEL
}
}
//failMsg := &Fail{Reason: msg, Magic: FailMagic, Round: round, Height: leader.currentHeight}
//failMsg.Height = leader.currentHeight
//for _, member := range leader.liveMembers {
// if member.Peer != nil && !member.IsMe {
// leader.sender.SendAsync(member.Peer.GetMsgRW(), MsgTypeFail, failMsg)
// }
//}
}
func (leader *Leader) waitForResponse() bool {
leader.setState(WAIT_RESPONSE)
tm := time.NewTimer(leader.waitTime)
defer tm.Stop()
select {
case <-tm.C:
responseNum := leader.getResponseNum()
log.WithField("responseNum", responseNum).WithField("liveMembers", len(leader.liveMembers)).Debug("waitForResponse finish")
if responseNum == len(leader.sigmaPubKey) {
leader.setState(COMPLETED)
return true
}
leader.setState(WAIT_RESPONSE_TIMEOUT)
return false
case <-leader.cancelWaitChallenge:
return true
}
}
func (leader *Leader) Validate(msg IConsenMsg, r *big.Int, s *big.Int) bool {
log.WithField("responseBitmap", leader.responseBitmap).WithField("commitBitmap", leader.commitBitmap).Debug("Validate signature")
if len(leader.responseBitmap) < len(leader.commitBitmap) {
log.WithField("responseBitmap", len(leader.responseBitmap)).WithField("commitBitmap", len(leader.commitBitmap)).Debug("peer in responseBitmap and commitBitmap was not correct")
return false
}
if len(leader.responseBitmap) < leader.minMember {
return false
}
sigmaPubKey := schnorr.CombinePubkeys(leader.getResponsePubkey())
return schnorr.Verify(sigmaPubKey, sha3.Keccak256(msg.AsSignMessage()), r, s)
}
func (leader *Leader) hasMarked(index int, bitmap []byte) bool {
return index >= 0 && index <= len(bitmap) && bitmap[index] != 1
}
func (leader *Leader) markResponse(peer consensusTypes.IPeerInfo) {
index := leader.getMinerIndex(peer)
if !leader.hasMarked(index, leader.responseBitmap) {
return
}
leader.responseBitmap[index] = 1
}
func (leader *Leader) markCommit(peer consensusTypes.IPeerInfo) {
index := leader.getMinerIndex(peer)
if !leader.hasMarked(index, leader.commitBitmap) {
return
}
leader.commitBitmap[index] = 1
}
func (leader *Leader) getMemberByPk(pk *secp256k1.PublicKey) *MemberInfo {
for _, producer := range leader.producers {
if producer.Peer != nil && producer.Producer.Pubkey.IsEqual(pk) {
return producer
}
}
return nil
}
func (leader *Leader) getMinerIndex(peer consensusTypes.IPeerInfo) int {
for i, v := range leader.producers {
if v.Peer != nil && v.Peer.Equal(peer) {
return i
}
}
return -1
}
func (leader *Leader) getCommitNum() int {
commitNum := 0
for _, val := range leader.commitBitmap {
if val == 1 {
commitNum = commitNum + 1
}
}
return commitNum
}
func (leader *Leader) getCommitPubkey() []*secp256k1.PublicKey {
publicKeys := []*secp256k1.PublicKey{}
for index, val := range leader.commitBitmap {
if val == 1 {
publicKeys = append(publicKeys, leader.producers[index].Producer.Pubkey)
}
}
return publicKeys
}
func (leader *Leader) getResponseNum() int {
responseNum := 0
for _, val := range leader.responseBitmap {
if val == 1 {
responseNum = responseNum + 1
}
}
return responseNum
}
func (leader *Leader) getResponsePubkey() []*secp256k1.PublicKey {
publicKeys := []*secp256k1.PublicKey{}
for index, val := range leader.responseBitmap {
if val == 1 {
publicKeys = append(publicKeys, leader.producers[index].Producer.Pubkey)
}
}
return publicKeys
}
func (leader *Leader) setState(state int) {
leader.stateLock.Lock()
defer leader.stateLock.Unlock()
if state == WAIT_COMMIT_IMEOUT {
fmt.Print("")
}
leader.currentState = state
}
func (leader *Leader) getState() int {
leader.stateLock.RLock()
defer leader.stateLock.RUnlock()
return leader.currentState
}