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505 lines
19 KiB
505 lines
19 KiB
package consensus
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import (
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"bytes"
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"encoding/binary"
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"sync"
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"time"
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"github.com/ethereum/go-ethereum/common"
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"github.com/harmony-one/bls/ffi/go/bls"
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msg_pb "github.com/harmony-one/harmony/api/proto/message"
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bls_cosi "github.com/harmony-one/harmony/crypto/bls"
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"github.com/harmony-one/harmony/internal/utils"
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"github.com/harmony-one/harmony/p2p"
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"github.com/harmony-one/harmony/p2p/host"
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)
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// PbftPhase PBFT phases: pre-prepare, prepare and commit
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type PbftPhase int
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// Enum for PbftPhase
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const (
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Announce PbftPhase = iota
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Prepare
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Commit
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)
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// Mode determines whether a node is in normal or viewchanging mode
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type Mode int
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// Enum for node Mode
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const (
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Normal Mode = iota
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ViewChanging
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Syncing
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)
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// PbftMode contains mode and viewID of viewchanging
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type PbftMode struct {
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mode Mode
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viewID uint64
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mux sync.Mutex
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}
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// Mode return the current node mode
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func (pm *PbftMode) Mode() Mode {
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return pm.mode
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}
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//String print mode string
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func (mode Mode) String() string {
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if mode == Normal {
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return "Normal"
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} else if mode == ViewChanging {
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return "ViewChanging"
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} else if mode == Syncing {
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return "Sycning"
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}
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return "Unknown"
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}
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// String print phase string
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func (phase PbftPhase) String() string {
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if phase == Announce {
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return "Announce"
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} else if phase == Prepare {
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return "Prepare"
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} else if phase == Commit {
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return "Commit"
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}
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return "Unknown"
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}
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// SetMode set the node mode as required
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func (pm *PbftMode) SetMode(m Mode) {
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pm.mux.Lock()
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defer pm.mux.Unlock()
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pm.mode = m
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}
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// ViewID return the current viewchanging id
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func (pm *PbftMode) ViewID() uint64 {
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return pm.viewID
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}
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// SetViewID sets the viewchanging id accordingly
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func (pm *PbftMode) SetViewID(viewID uint64) {
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pm.mux.Lock()
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defer pm.mux.Unlock()
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pm.viewID = viewID
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}
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// GetViewID returns the current viewchange viewID
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func (pm *PbftMode) GetViewID() uint64 {
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return pm.viewID
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}
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// switchPhase will switch PbftPhase to nextPhase if the desirePhase equals the nextPhase
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func (consensus *Consensus) switchPhase(desirePhase PbftPhase, override bool) {
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if override {
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consensus.phase = desirePhase
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return
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}
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var nextPhase PbftPhase
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switch consensus.phase {
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case Announce:
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nextPhase = Prepare
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case Prepare:
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nextPhase = Commit
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case Commit:
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nextPhase = Announce
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}
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if nextPhase == desirePhase {
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consensus.phase = nextPhase
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}
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}
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// GetNextLeaderKey uniquely determine who is the leader for given viewID
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func (consensus *Consensus) GetNextLeaderKey() *bls.PublicKey {
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idx := consensus.getIndexOfPubKey(consensus.LeaderPubKey)
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if idx == -1 {
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consensus.getLogger().Warn("GetNextLeaderKey: currentLeaderKey not found", "key", consensus.LeaderPubKey.SerializeToHexStr())
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}
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idx = (idx + 1) % len(consensus.PublicKeys)
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return consensus.PublicKeys[idx]
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}
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func (consensus *Consensus) getIndexOfPubKey(pubKey *bls.PublicKey) int {
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for k, v := range consensus.PublicKeys {
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if v.IsEqual(pubKey) {
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return k
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}
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}
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return -1
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}
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// ResetViewChangeState reset the state for viewchange
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func (consensus *Consensus) ResetViewChangeState() {
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consensus.getLogger().Debug("[ResetViewChangeState] Resetting view change state", "Phase", consensus.phase)
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consensus.mode.SetMode(Normal)
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bhpBitmap, _ := bls_cosi.NewMask(consensus.PublicKeys, nil)
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nilBitmap, _ := bls_cosi.NewMask(consensus.PublicKeys, nil)
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viewIDBitmap, _ := bls_cosi.NewMask(consensus.PublicKeys, nil)
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consensus.bhpBitmap = bhpBitmap
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consensus.nilBitmap = nilBitmap
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consensus.viewIDBitmap = viewIDBitmap
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consensus.m1Payload = []byte{}
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consensus.bhpSigs = map[string]*bls.Sign{}
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consensus.nilSigs = map[string]*bls.Sign{}
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consensus.viewIDSigs = map[string]*bls.Sign{}
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}
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func createTimeout() map[TimeoutType]*utils.Timeout {
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timeouts := make(map[TimeoutType]*utils.Timeout)
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timeouts[timeoutConsensus] = utils.NewTimeout(phaseDuration)
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timeouts[timeoutViewChange] = utils.NewTimeout(viewChangeDuration)
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timeouts[timeoutBootstrap] = utils.NewTimeout(bootstrapDuration)
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return timeouts
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}
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// startViewChange send a new view change
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func (consensus *Consensus) startViewChange(viewID uint64) {
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if consensus.disableViewChange {
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return
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}
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consensus.consensusTimeout[timeoutConsensus].Stop()
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consensus.consensusTimeout[timeoutBootstrap].Stop()
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consensus.mode.SetMode(ViewChanging)
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consensus.mode.SetViewID(viewID)
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consensus.LeaderPubKey = consensus.GetNextLeaderKey()
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diff := viewID - consensus.viewID
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duration := time.Duration(int64(diff) * int64(viewChangeDuration))
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consensus.getLogger().Info("[startViewChange]", "ViewChangingID", viewID, "timeoutDuration", duration, "NextLeader", consensus.LeaderPubKey.SerializeToHexStr())
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msgToSend := consensus.constructViewChangeMessage()
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consensus.host.SendMessageToGroups([]p2p.GroupID{p2p.NewGroupIDByShardID(p2p.ShardID(consensus.ShardID))}, host.ConstructP2pMessage(byte(17), msgToSend))
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consensus.consensusTimeout[timeoutViewChange].SetDuration(duration)
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consensus.consensusTimeout[timeoutViewChange].Start()
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consensus.getLogger().Debug("[startViewChange] start view change timer", "ViewChangingID", consensus.mode.ViewID())
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}
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func (consensus *Consensus) onViewChange(msg *msg_pb.Message) {
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recvMsg, err := ParseViewChangeMessage(msg)
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if err != nil {
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consensus.getLogger().Warn("[onViewChange] Unable To Parse Viewchange Message")
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return
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}
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newLeaderKey := recvMsg.LeaderPubkey
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if !consensus.PubKey.IsEqual(newLeaderKey) {
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return
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}
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if len(consensus.viewIDSigs) >= consensus.Quorum() {
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consensus.getLogger().Debug("[onViewChange] Received Enough View Change Messages", "have", len(consensus.viewIDSigs), "need", consensus.Quorum(), "validatorPubKey", recvMsg.SenderPubkey.SerializeToHexStr())
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return
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}
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senderKey, err := consensus.verifyViewChangeSenderKey(msg)
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if err != nil {
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consensus.getLogger().Debug("[onViewChange] VerifySenderKey Failed", "error", err)
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return
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}
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// TODO: if difference is only one, new leader can still propose the same committed block to avoid another view change
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if consensus.blockNum > recvMsg.BlockNum {
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consensus.getLogger().Debug("[onViewChange] Message BlockNum Is Low", "MsgBlockNum", recvMsg.BlockNum)
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return
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}
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if consensus.blockNum < recvMsg.BlockNum {
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consensus.getLogger().Warn("[onViewChange] New Leader Has Lower Blocknum", "MsgBlockNum", recvMsg.BlockNum)
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return
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}
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if consensus.mode.Mode() == ViewChanging && consensus.mode.ViewID() > recvMsg.ViewID {
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consensus.getLogger().Warn("[onViewChange] ViewChanging ID Is Low", "MyViewChangingID", consensus.mode.ViewID(), "MsgViewChangingID", recvMsg.ViewID)
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return
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}
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if err = verifyMessageSig(senderKey, msg); err != nil {
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consensus.getLogger().Debug("[onViewChange] Failed To Verify Sender's Signature", "error", err)
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return
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}
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consensus.vcLock.Lock()
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defer consensus.vcLock.Unlock()
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// add self m1 or m2 type message signature and bitmap
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_, ok1 := consensus.nilSigs[consensus.PubKey.SerializeToHexStr()]
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_, ok2 := consensus.bhpSigs[consensus.PubKey.SerializeToHexStr()]
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if !(ok1 || ok2) {
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// add own signature for newview message
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preparedMsgs := consensus.PbftLog.GetMessagesByTypeSeq(msg_pb.MessageType_PREPARED, recvMsg.BlockNum)
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preparedMsg := consensus.PbftLog.FindMessageByMaxViewID(preparedMsgs)
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if preparedMsg == nil {
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consensus.getLogger().Debug("[onViewChange] add my M2(NIL) type messaage")
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consensus.nilSigs[consensus.PubKey.SerializeToHexStr()] = consensus.priKey.SignHash(NIL)
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consensus.nilBitmap.SetKey(consensus.PubKey, true)
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} else {
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consensus.getLogger().Debug("[onViewChange] add my M1 type messaage")
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msgToSign := append(preparedMsg.BlockHash[:], preparedMsg.Payload...)
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consensus.bhpSigs[consensus.PubKey.SerializeToHexStr()] = consensus.priKey.SignHash(msgToSign)
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consensus.bhpBitmap.SetKey(consensus.PubKey, true)
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}
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}
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// add self m3 type message signature and bitmap
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_, ok3 := consensus.viewIDSigs[consensus.PubKey.SerializeToHexStr()]
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if !ok3 {
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viewIDBytes := make([]byte, 8)
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binary.LittleEndian.PutUint64(viewIDBytes, recvMsg.ViewID)
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consensus.viewIDSigs[consensus.PubKey.SerializeToHexStr()] = consensus.priKey.SignHash(viewIDBytes)
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consensus.viewIDBitmap.SetKey(consensus.PubKey, true)
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}
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// m2 type message
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if len(recvMsg.Payload) == 0 {
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_, ok := consensus.nilSigs[senderKey.SerializeToHexStr()]
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if ok {
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consensus.getLogger().Debug("[onViewChange] Already Received M2 message from validator", "validatorPubKey", senderKey.SerializeToHexStr())
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return
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}
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if !recvMsg.ViewchangeSig.VerifyHash(senderKey, NIL) {
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consensus.getLogger().Warn("[onViewChange] Failed To Verify Signature For M2 Type Viewchange Message")
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return
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}
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consensus.getLogger().Debug("[onViewChange] Add M2 (NIL) type message", "validatorPubKey", senderKey.SerializeToHexStr())
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consensus.nilSigs[senderKey.SerializeToHexStr()] = recvMsg.ViewchangeSig
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consensus.nilBitmap.SetKey(recvMsg.SenderPubkey, true) // Set the bitmap indicating that this validator signed.
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} else { // m1 type message
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_, ok := consensus.bhpSigs[senderKey.SerializeToHexStr()]
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if ok {
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consensus.getLogger().Debug("[onViewChange] Already Received M1 Message From the Validator", "validatorPubKey", senderKey.SerializeToHexStr())
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return
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}
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if !recvMsg.ViewchangeSig.VerifyHash(recvMsg.SenderPubkey, recvMsg.Payload) {
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consensus.getLogger().Warn("[onViewChange] Failed to Verify Signature for M1 Type Viewchange Message")
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return
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}
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// first time receive m1 type message, need verify validity of prepared message
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if len(consensus.m1Payload) == 0 || !bytes.Equal(consensus.m1Payload, recvMsg.Payload) {
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if len(recvMsg.Payload) <= 32 {
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consensus.getLogger().Debug("[onViewChange] M1 RecvMsg Payload Not Enough Length", "len", len(recvMsg.Payload))
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return
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}
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blockHash := recvMsg.Payload[:32]
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aggSig, mask, err := consensus.ReadSignatureBitmapPayload(recvMsg.Payload, 32)
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if err != nil {
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consensus.getLogger().Error("[onViewChange] M1 RecvMsg Payload Read Error", "error", err)
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return
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}
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// check has 2f+1 signature in m1 type message
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if count := utils.CountOneBits(mask.Bitmap); count < consensus.Quorum() {
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consensus.getLogger().Debug("[onViewChange] M1 Payload Not Have Enough Signature", "need", consensus.Quorum(), "have", count)
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return
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}
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// Verify the multi-sig for prepare phase
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if !aggSig.VerifyHash(mask.AggregatePublic, blockHash[:]) {
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consensus.getLogger().Warn("[onViewChange] failed to verify multi signature for m1 prepared payload", "blockHash", blockHash)
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return
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}
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// if m1Payload is empty, we just add one
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if len(consensus.m1Payload) == 0 {
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consensus.m1Payload = append(recvMsg.Payload[:0:0], recvMsg.Payload...)
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// create prepared message for new leader
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preparedMsg := PbftMessage{MessageType: msg_pb.MessageType_PREPARED, ViewID: recvMsg.ViewID, BlockNum: recvMsg.BlockNum}
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preparedMsg.BlockHash = common.Hash{}
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copy(preparedMsg.BlockHash[:], recvMsg.Payload[:32])
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preparedMsg.Payload = make([]byte, len(recvMsg.Payload)-32)
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copy(preparedMsg.Payload[:], recvMsg.Payload[32:])
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preparedMsg.SenderPubkey = consensus.PubKey
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consensus.getLogger().Info("[onViewChange] New Leader Prepared Message Added")
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consensus.PbftLog.AddMessage(&preparedMsg)
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}
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}
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consensus.getLogger().Debug("[onViewChange] Add M1 (prepared) type message", "validatorPubKey", senderKey.SerializeToHexStr())
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consensus.bhpSigs[senderKey.SerializeToHexStr()] = recvMsg.ViewchangeSig
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consensus.bhpBitmap.SetKey(recvMsg.SenderPubkey, true) // Set the bitmap indicating that this validator signed.
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}
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// check and add viewID (m3 type) message signature
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_, ok := consensus.viewIDSigs[senderKey.SerializeToHexStr()]
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if ok {
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consensus.getLogger().Debug("[onViewChange] Already Received M3(ViewID) message from the validator", "senderKey.SerializeToHexStr()", senderKey.SerializeToHexStr())
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return
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}
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viewIDHash := make([]byte, 8)
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binary.LittleEndian.PutUint64(viewIDHash, recvMsg.ViewID)
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if !recvMsg.ViewidSig.VerifyHash(recvMsg.SenderPubkey, viewIDHash) {
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consensus.getLogger().Warn("[onViewChange] Failed to Verify M3 Message Signature", "MsgViewID", recvMsg.ViewID)
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return
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}
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consensus.getLogger().Debug("[onViewChange] Add M3 (ViewID) type message", "validatorPubKey", senderKey.SerializeToHexStr())
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consensus.viewIDSigs[senderKey.SerializeToHexStr()] = recvMsg.ViewidSig
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consensus.viewIDBitmap.SetKey(recvMsg.SenderPubkey, true) // Set the bitmap indicating that this validator signed.
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consensus.getLogger().Debug("[onViewChange]", "numSigs", len(consensus.viewIDSigs), "needed", consensus.Quorum())
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// received enough view change messages, change state to normal consensus
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if len(consensus.viewIDSigs) >= consensus.Quorum() {
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consensus.mode.SetMode(Normal)
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consensus.LeaderPubKey = consensus.PubKey
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consensus.ResetState()
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if len(consensus.m1Payload) == 0 {
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go func() {
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consensus.ReadySignal <- struct{}{}
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}()
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} else {
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consensus.getLogger().Debug("[OnViewChange] Switching phase", "From", consensus.phase, "To", Commit)
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consensus.switchPhase(Commit, true)
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copy(consensus.blockHash[:], consensus.m1Payload[:32])
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aggSig, mask, err := consensus.ReadSignatureBitmapPayload(recvMsg.Payload, 32)
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if err != nil {
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consensus.getLogger().Error("[onViewChange] ReadSignatureBitmapPayload Fail", "error", err)
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return
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}
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consensus.aggregatedPrepareSig = aggSig
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consensus.prepareBitmap = mask
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// Leader sign and add commit message
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blockNumBytes := make([]byte, 8)
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binary.LittleEndian.PutUint64(blockNumBytes, consensus.blockNum)
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commitPayload := append(blockNumBytes, consensus.blockHash[:]...)
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consensus.commitSigs[consensus.PubKey.SerializeToHexStr()] = consensus.priKey.SignHash(commitPayload)
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if err = consensus.commitBitmap.SetKey(consensus.PubKey, true); err != nil {
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consensus.getLogger().Debug("[OnViewChange] New Leader commit bitmap set failed")
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return
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}
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}
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consensus.mode.SetViewID(recvMsg.ViewID)
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msgToSend := consensus.constructNewViewMessage()
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consensus.getLogger().Warn("[onViewChange] Sent NewView Message", "len(M1Payload)", len(consensus.m1Payload), "M1Payload", consensus.m1Payload)
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consensus.host.SendMessageToGroups([]p2p.GroupID{p2p.NewGroupIDByShardID(p2p.ShardID(consensus.ShardID))}, host.ConstructP2pMessage(byte(17), msgToSend))
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consensus.viewID = recvMsg.ViewID
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consensus.ResetViewChangeState()
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consensus.consensusTimeout[timeoutViewChange].Stop()
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consensus.consensusTimeout[timeoutConsensus].Start()
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consensus.getLogger().Debug("[onViewChange] New Leader Start Consensus Timer and Stop View Change Timer", "viewChangingID", consensus.mode.ViewID())
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consensus.getLogger().Debug("[onViewChange] I am the New Leader", "myKey", consensus.PubKey.SerializeToHexStr(), "viewID", consensus.viewID, "block", consensus.blockNum)
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}
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}
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// TODO: move to consensus_leader.go later
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func (consensus *Consensus) onNewView(msg *msg_pb.Message) {
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consensus.getLogger().Debug("[onNewView] Received NewView Message")
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senderKey, err := consensus.verifyViewChangeSenderKey(msg)
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if err != nil {
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consensus.getLogger().Warn("[onNewView] VerifySenderKey Failed", "error", err)
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return
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}
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recvMsg, err := consensus.ParseNewViewMessage(msg)
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if err != nil {
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consensus.getLogger().Warn("[onNewView] Unable to Parse NewView Message", "error", err)
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return
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}
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if err = verifyMessageSig(senderKey, msg); err != nil {
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consensus.getLogger().Error("[onNewView] Failed to Verify New Leader's Signature", "error", err)
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return
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}
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consensus.vcLock.Lock()
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defer consensus.vcLock.Unlock()
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if recvMsg.M3AggSig == nil || recvMsg.M3Bitmap == nil {
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consensus.getLogger().Error("[onNewView] M3AggSig or M3Bitmap is nil")
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return
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}
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m3Sig := recvMsg.M3AggSig
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m3Mask := recvMsg.M3Bitmap
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viewIDBytes := make([]byte, 8)
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binary.LittleEndian.PutUint64(viewIDBytes, recvMsg.ViewID)
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// check total number of sigs >= 2f+1
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if count := utils.CountOneBits(m3Mask.Bitmap); count < consensus.Quorum() {
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consensus.getLogger().Debug("[onNewView] Not Have Enough M3 (ViewID) Signature", "need", consensus.Quorum(), "have", count)
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return
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}
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if !m3Sig.VerifyHash(m3Mask.AggregatePublic, viewIDBytes) {
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consensus.getLogger().Warn("[onNewView] Unable to Verify Aggregated Signature of M3 (ViewID) payload", "m3Sig", m3Sig.SerializeToHexStr(), "m3Mask", m3Mask.Bitmap, "MsgViewID", recvMsg.ViewID)
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return
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}
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m2Mask := recvMsg.M2Bitmap
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if recvMsg.M2AggSig != nil {
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consensus.getLogger().Debug("[onNewView] M2AggSig (NIL) is Not Empty")
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m2Sig := recvMsg.M2AggSig
|
|
if !m2Sig.VerifyHash(m2Mask.AggregatePublic, NIL) {
|
|
consensus.getLogger().Warn("[onNewView] Unable to Verify Aggregated Signature of M2 (NIL) payload")
|
|
return
|
|
}
|
|
}
|
|
|
|
// check when M3 sigs > M2 sigs, then M1 (recvMsg.Payload) should not be empty
|
|
if m2Mask == nil || m2Mask.Bitmap == nil || (m2Mask != nil && m2Mask.Bitmap != nil && utils.CountOneBits(m3Mask.Bitmap) > utils.CountOneBits(m2Mask.Bitmap)) {
|
|
if len(recvMsg.Payload) <= 32 {
|
|
consensus.getLogger().Debug("[onNewView] M1 (prepared) Type Payload Not Have Enough Length")
|
|
return
|
|
}
|
|
// m1 is not empty, check it's valid
|
|
blockHash := recvMsg.Payload[:32]
|
|
aggSig, mask, err := consensus.ReadSignatureBitmapPayload(recvMsg.Payload, 32)
|
|
if err != nil {
|
|
consensus.getLogger().Error("[onNewView] ReadSignatureBitmapPayload Failed", "error", err)
|
|
return
|
|
}
|
|
if !aggSig.VerifyHash(mask.AggregatePublic, blockHash) {
|
|
consensus.getLogger().Warn("[onNewView] Failed to Verify Signature for M1 (prepare) message")
|
|
return
|
|
}
|
|
copy(consensus.blockHash[:], blockHash)
|
|
consensus.aggregatedPrepareSig = aggSig
|
|
consensus.prepareBitmap = mask
|
|
|
|
// create prepared message from newview
|
|
preparedMsg := PbftMessage{MessageType: msg_pb.MessageType_PREPARED, ViewID: recvMsg.ViewID, BlockNum: recvMsg.BlockNum}
|
|
preparedMsg.BlockHash = common.Hash{}
|
|
copy(preparedMsg.BlockHash[:], blockHash[:])
|
|
preparedMsg.Payload = make([]byte, len(recvMsg.Payload)-32)
|
|
copy(preparedMsg.Payload[:], recvMsg.Payload[32:])
|
|
preparedMsg.SenderPubkey = senderKey
|
|
consensus.PbftLog.AddMessage(&preparedMsg)
|
|
}
|
|
|
|
// newView message verified success, override my state
|
|
consensus.viewID = recvMsg.ViewID
|
|
consensus.mode.SetViewID(recvMsg.ViewID)
|
|
consensus.LeaderPubKey = senderKey
|
|
consensus.ResetViewChangeState()
|
|
|
|
// change view and leaderKey to keep in sync with network
|
|
if consensus.blockNum != recvMsg.BlockNum {
|
|
consensus.getLogger().Debug("[onNewView] New Leader Changed", "newLeaderKey", consensus.LeaderPubKey.SerializeToHexStr(), "MsgBlockNum", recvMsg.BlockNum)
|
|
return
|
|
}
|
|
|
|
// NewView message is verified, change state to normal consensus
|
|
if len(recvMsg.Payload) > 32 {
|
|
// Construct and send the commit message
|
|
blockNumHash := make([]byte, 8)
|
|
binary.LittleEndian.PutUint64(blockNumHash, consensus.blockNum)
|
|
commitPayload := append(blockNumHash, consensus.blockHash[:]...)
|
|
msgToSend := consensus.constructCommitMessage(commitPayload)
|
|
|
|
consensus.getLogger().Info("onNewView === commit")
|
|
consensus.host.SendMessageToGroups([]p2p.GroupID{p2p.NewGroupIDByShardID(p2p.ShardID(consensus.ShardID))}, host.ConstructP2pMessage(byte(17), msgToSend))
|
|
consensus.getLogger().Debug("[OnViewChange] Switching phase", "From", consensus.phase, "To", Commit)
|
|
consensus.switchPhase(Commit, true)
|
|
} else {
|
|
consensus.ResetState()
|
|
consensus.getLogger().Info("onNewView === announce")
|
|
}
|
|
consensus.getLogger().Debug("new leader changed", "newLeaderKey", consensus.LeaderPubKey.SerializeToHexStr())
|
|
consensus.getLogger().Debug("validator start consensus timer and stop view change timer")
|
|
consensus.consensusTimeout[timeoutConsensus].Start()
|
|
consensus.consensusTimeout[timeoutViewChange].Stop()
|
|
}
|
|
|