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tendermint/consensus/reactor.go

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package consensus
import (
"bytes"
"context"
"fmt"
"reflect"
"sync"
"time"
"github.com/pkg/errors"
wire "github.com/tendermint/go-wire"
cmn "github.com/tendermint/tmlibs/common"
"github.com/tendermint/tmlibs/log"
cstypes "github.com/tendermint/tendermint/consensus/types"
"github.com/tendermint/tendermint/p2p"
sm "github.com/tendermint/tendermint/state"
"github.com/tendermint/tendermint/types"
)
const (
StateChannel = byte(0x20)
DataChannel = byte(0x21)
VoteChannel = byte(0x22)
VoteSetBitsChannel = byte(0x23)
maxConsensusMessageSize = 1048576 // 1MB; NOTE/TODO: keep in sync with types.PartSet sizes.
)
//-----------------------------------------------------------------------------
// ConsensusReactor defines a reactor for the consensus service.
type ConsensusReactor struct {
p2p.BaseReactor // BaseService + p2p.Switch
conS *ConsensusState
mtx sync.RWMutex
fastSync bool
eventBus *types.EventBus
}
// NewConsensusReactor returns a new ConsensusReactor with the given consensusState.
func NewConsensusReactor(consensusState *ConsensusState, fastSync bool) *ConsensusReactor {
conR := &ConsensusReactor{
conS: consensusState,
fastSync: fastSync,
}
conR.BaseReactor = *p2p.NewBaseReactor("ConsensusReactor", conR)
return conR
}
// OnStart implements BaseService.
func (conR *ConsensusReactor) OnStart() error {
conR.Logger.Info("ConsensusReactor ", "fastSync", conR.FastSync())
if err := conR.BaseReactor.OnStart(); err != nil {
return err
}
err := conR.startBroadcastRoutine()
if err != nil {
return err
}
if !conR.FastSync() {
err := conR.conS.Start()
if err != nil {
return err
}
}
return nil
}
// OnStop implements BaseService
func (conR *ConsensusReactor) OnStop() {
conR.BaseReactor.OnStop()
conR.conS.Stop()
}
// SwitchToConsensus switches from fast_sync mode to consensus mode.
// It resets the state, turns off fast_sync, and starts the consensus state-machine
func (conR *ConsensusReactor) SwitchToConsensus(state *sm.State, blocksSynced int) {
conR.Logger.Info("SwitchToConsensus")
conR.conS.reconstructLastCommit(state)
// NOTE: The line below causes broadcastNewRoundStepRoutine() to
// broadcast a NewRoundStepMessage.
conR.conS.updateToState(state)
conR.mtx.Lock()
conR.fastSync = false
conR.mtx.Unlock()
if blocksSynced > 0 {
// dont bother with the WAL if we fast synced
conR.conS.doWALCatchup = false
}
err := conR.conS.Start()
if err != nil {
conR.Logger.Error("Error starting conS", "err", err)
}
}
// GetChannels implements Reactor
func (conR *ConsensusReactor) GetChannels() []*p2p.ChannelDescriptor {
// TODO optimize
return []*p2p.ChannelDescriptor{
{
ID: StateChannel,
Priority: 5,
SendQueueCapacity: 100,
},
{
ID: DataChannel, // maybe split between gossiping current block and catchup stuff
Priority: 10, // once we gossip the whole block there's nothing left to send until next height or round
SendQueueCapacity: 100,
RecvBufferCapacity: 50 * 4096,
},
{
ID: VoteChannel,
Priority: 5,
SendQueueCapacity: 100,
RecvBufferCapacity: 100 * 100,
},
{
ID: VoteSetBitsChannel,
Priority: 1,
SendQueueCapacity: 2,
RecvBufferCapacity: 1024,
},
}
}
// AddPeer implements Reactor
func (conR *ConsensusReactor) AddPeer(peer p2p.Peer) {
if !conR.IsRunning() {
return
}
// Create peerState for peer
peerState := NewPeerState(peer).SetLogger(conR.Logger)
peer.Set(types.PeerStateKey, peerState)
// Begin routines for this peer.
go conR.gossipDataRoutine(peer, peerState)
go conR.gossipVotesRoutine(peer, peerState)
go conR.queryMaj23Routine(peer, peerState)
// Send our state to peer.
// If we're fast_syncing, broadcast a RoundStepMessage later upon SwitchToConsensus().
if !conR.FastSync() {
conR.sendNewRoundStepMessages(peer)
}
}
// RemovePeer implements Reactor
func (conR *ConsensusReactor) RemovePeer(peer p2p.Peer, reason interface{}) {
if !conR.IsRunning() {
return
}
// TODO
//peer.Get(PeerStateKey).(*PeerState).Disconnect()
}
// Receive implements Reactor
// NOTE: We process these messages even when we're fast_syncing.
// Messages affect either a peer state or the consensus state.
// Peer state updates can happen in parallel, but processing of
// proposals, block parts, and votes are ordered by the receiveRoutine
// NOTE: blocks on consensus state for proposals, block parts, and votes
func (conR *ConsensusReactor) Receive(chID byte, src p2p.Peer, msgBytes []byte) {
if !conR.IsRunning() {
conR.Logger.Debug("Receive", "src", src, "chId", chID, "bytes", msgBytes)
return
}
_, msg, err := DecodeMessage(msgBytes)
if err != nil {
conR.Logger.Error("Error decoding message", "src", src, "chId", chID, "msg", msg, "err", err, "bytes", msgBytes)
// TODO punish peer?
return
}
conR.Logger.Debug("Receive", "src", src, "chId", chID, "msg", msg)
// Get peer states
ps := src.Get(types.PeerStateKey).(*PeerState)
switch chID {
case StateChannel:
switch msg := msg.(type) {
case *NewRoundStepMessage:
ps.ApplyNewRoundStepMessage(msg)
case *CommitStepMessage:
ps.ApplyCommitStepMessage(msg)
case *HasVoteMessage:
ps.ApplyHasVoteMessage(msg)
case *VoteSetMaj23Message:
cs := conR.conS
cs.mtx.Lock()
height, votes := cs.Height, cs.Votes
cs.mtx.Unlock()
if height != msg.Height {
return
}
// Peer claims to have a maj23 for some BlockID at H,R,S,
votes.SetPeerMaj23(msg.Round, msg.Type, ps.Peer.Key(), msg.BlockID)
// Respond with a VoteSetBitsMessage showing which votes we have.
// (and consequently shows which we don't have)
var ourVotes *cmn.BitArray
switch msg.Type {
case types.VoteTypePrevote:
ourVotes = votes.Prevotes(msg.Round).BitArrayByBlockID(msg.BlockID)
case types.VoteTypePrecommit:
ourVotes = votes.Precommits(msg.Round).BitArrayByBlockID(msg.BlockID)
default:
conR.Logger.Error("Bad VoteSetBitsMessage field Type")
return
}
src.TrySend(VoteSetBitsChannel, struct{ ConsensusMessage }{&VoteSetBitsMessage{
Height: msg.Height,
Round: msg.Round,
Type: msg.Type,
BlockID: msg.BlockID,
Votes: ourVotes,
}})
case *ProposalHeartbeatMessage:
hb := msg.Heartbeat
conR.Logger.Debug("Received proposal heartbeat message",
"height", hb.Height, "round", hb.Round, "sequence", hb.Sequence,
"valIdx", hb.ValidatorIndex, "valAddr", hb.ValidatorAddress)
default:
conR.Logger.Error(cmn.Fmt("Unknown message type %v", reflect.TypeOf(msg)))
}
case DataChannel:
if conR.FastSync() {
conR.Logger.Info("Ignoring message received during fastSync", "msg", msg)
return
}
switch msg := msg.(type) {
case *ProposalMessage:
ps.SetHasProposal(msg.Proposal)
conR.conS.peerMsgQueue <- msgInfo{msg, src.Key()}
case *ProposalPOLMessage:
ps.ApplyProposalPOLMessage(msg)
case *BlockPartMessage:
ps.SetHasProposalBlockPart(msg.Height, msg.Round, msg.Part.Index)
conR.conS.peerMsgQueue <- msgInfo{msg, src.Key()}
default:
conR.Logger.Error(cmn.Fmt("Unknown message type %v", reflect.TypeOf(msg)))
}
case VoteChannel:
if conR.FastSync() {
conR.Logger.Info("Ignoring message received during fastSync", "msg", msg)
return
}
switch msg := msg.(type) {
case *VoteMessage:
cs := conR.conS
cs.mtx.Lock()
height, valSize, lastCommitSize := cs.Height, cs.Validators.Size(), cs.LastCommit.Size()
cs.mtx.Unlock()
ps.EnsureVoteBitArrays(height, valSize)
ps.EnsureVoteBitArrays(height-1, lastCommitSize)
ps.SetHasVote(msg.Vote)
cs.peerMsgQueue <- msgInfo{msg, src.Key()}
default:
// don't punish (leave room for soft upgrades)
conR.Logger.Error(cmn.Fmt("Unknown message type %v", reflect.TypeOf(msg)))
}
case VoteSetBitsChannel:
if conR.FastSync() {
conR.Logger.Info("Ignoring message received during fastSync", "msg", msg)
return
}
switch msg := msg.(type) {
case *VoteSetBitsMessage:
cs := conR.conS
cs.mtx.Lock()
height, votes := cs.Height, cs.Votes
cs.mtx.Unlock()
if height == msg.Height {
var ourVotes *cmn.BitArray
switch msg.Type {
case types.VoteTypePrevote:
ourVotes = votes.Prevotes(msg.Round).BitArrayByBlockID(msg.BlockID)
case types.VoteTypePrecommit:
ourVotes = votes.Precommits(msg.Round).BitArrayByBlockID(msg.BlockID)
default:
conR.Logger.Error("Bad VoteSetBitsMessage field Type")
return
}
ps.ApplyVoteSetBitsMessage(msg, ourVotes)
} else {
ps.ApplyVoteSetBitsMessage(msg, nil)
}
default:
// don't punish (leave room for soft upgrades)
conR.Logger.Error(cmn.Fmt("Unknown message type %v", reflect.TypeOf(msg)))
}
default:
conR.Logger.Error(cmn.Fmt("Unknown chId %X", chID))
}
if err != nil {
conR.Logger.Error("Error in Receive()", "err", err)
}
}
// SetEventBus sets event bus.
func (conR *ConsensusReactor) SetEventBus(b *types.EventBus) {
conR.eventBus = b
conR.conS.SetEventBus(b)
}
// FastSync returns whether the consensus reactor is in fast-sync mode.
func (conR *ConsensusReactor) FastSync() bool {
conR.mtx.RLock()
defer conR.mtx.RUnlock()
return conR.fastSync
}
//--------------------------------------
// startBroadcastRoutine subscribes for new round steps, votes and proposal
// heartbeats using the event bus and starts a go routine to broadcasts events
// to peers upon receiving them.
func (conR *ConsensusReactor) startBroadcastRoutine() error {
const subscriber = "consensus-reactor"
ctx := context.Background()
// new round steps
stepsCh := make(chan interface{})
err := conR.eventBus.Subscribe(ctx, subscriber, types.EventQueryNewRoundStep, stepsCh)
if err != nil {
return errors.Wrapf(err, "failed to subscribe %s to %s", subscriber, types.EventQueryNewRoundStep)
}
// votes
votesCh := make(chan interface{})
err = conR.eventBus.Subscribe(ctx, subscriber, types.EventQueryVote, votesCh)
if err != nil {
return errors.Wrapf(err, "failed to subscribe %s to %s", subscriber, types.EventQueryVote)
}
// proposal heartbeats
heartbeatsCh := make(chan interface{})
err = conR.eventBus.Subscribe(ctx, subscriber, types.EventQueryProposalHeartbeat, heartbeatsCh)
if err != nil {
return errors.Wrapf(err, "failed to subscribe %s to %s", subscriber, types.EventQueryProposalHeartbeat)
}
go func() {
for {
select {
case data, ok := <-stepsCh:
if ok { // a receive from a closed channel returns the zero value immediately
edrs := data.(types.TMEventData).Unwrap().(types.EventDataRoundState)
conR.broadcastNewRoundStep(edrs.RoundState.(*cstypes.RoundState))
}
case data, ok := <-votesCh:
if ok {
edv := data.(types.TMEventData).Unwrap().(types.EventDataVote)
conR.broadcastHasVoteMessage(edv.Vote)
}
case data, ok := <-heartbeatsCh:
if ok {
edph := data.(types.TMEventData).Unwrap().(types.EventDataProposalHeartbeat)
conR.broadcastProposalHeartbeatMessage(edph)
}
case <-conR.Quit:
conR.eventBus.UnsubscribeAll(ctx, subscriber)
return
}
}
}()
return nil
}
func (conR *ConsensusReactor) broadcastProposalHeartbeatMessage(heartbeat types.EventDataProposalHeartbeat) {
hb := heartbeat.Heartbeat
conR.Logger.Debug("Broadcasting proposal heartbeat message",
"height", hb.Height, "round", hb.Round, "sequence", hb.Sequence)
msg := &ProposalHeartbeatMessage{hb}
conR.Switch.Broadcast(StateChannel, struct{ ConsensusMessage }{msg})
}
func (conR *ConsensusReactor) broadcastNewRoundStep(rs *cstypes.RoundState) {
nrsMsg, csMsg := makeRoundStepMessages(rs)
if nrsMsg != nil {
conR.Switch.Broadcast(StateChannel, struct{ ConsensusMessage }{nrsMsg})
}
if csMsg != nil {
conR.Switch.Broadcast(StateChannel, struct{ ConsensusMessage }{csMsg})
}
}
// Broadcasts HasVoteMessage to peers that care.
func (conR *ConsensusReactor) broadcastHasVoteMessage(vote *types.Vote) {
msg := &HasVoteMessage{
Height: vote.Height,
Round: vote.Round,
Type: vote.Type,
Index: vote.ValidatorIndex,
}
conR.Switch.Broadcast(StateChannel, struct{ ConsensusMessage }{msg})
/*
// TODO: Make this broadcast more selective.
for _, peer := range conR.Switch.Peers().List() {
ps := peer.Get(PeerStateKey).(*PeerState)
prs := ps.GetRoundState()
if prs.Height == vote.Height {
// TODO: Also filter on round?
peer.TrySend(StateChannel, struct{ ConsensusMessage }{msg})
} else {
// Height doesn't match
// TODO: check a field, maybe CatchupCommitRound?
// TODO: But that requires changing the struct field comment.
}
}
*/
}
func makeRoundStepMessages(rs *cstypes.RoundState) (nrsMsg *NewRoundStepMessage, csMsg *CommitStepMessage) {
nrsMsg = &NewRoundStepMessage{
Height: rs.Height,
Round: rs.Round,
Step: rs.Step,
SecondsSinceStartTime: int(time.Since(rs.StartTime).Seconds()),
LastCommitRound: rs.LastCommit.Round(),
}
if rs.Step == cstypes.RoundStepCommit {
csMsg = &CommitStepMessage{
Height: rs.Height,
BlockPartsHeader: rs.ProposalBlockParts.Header(),
BlockParts: rs.ProposalBlockParts.BitArray(),
}
}
return
}
func (conR *ConsensusReactor) sendNewRoundStepMessages(peer p2p.Peer) {
rs := conR.conS.GetRoundState()
nrsMsg, csMsg := makeRoundStepMessages(rs)
if nrsMsg != nil {
peer.Send(StateChannel, struct{ ConsensusMessage }{nrsMsg})
}
if csMsg != nil {
peer.Send(StateChannel, struct{ ConsensusMessage }{csMsg})
}
}
func (conR *ConsensusReactor) gossipDataRoutine(peer p2p.Peer, ps *PeerState) {
logger := conR.Logger.With("peer", peer)
OUTER_LOOP:
for {
// Manage disconnects from self or peer.
if !peer.IsRunning() || !conR.IsRunning() {
logger.Info("Stopping gossipDataRoutine for peer")
return
}
rs := conR.conS.GetRoundState()
prs := ps.GetRoundState()
// Send proposal Block parts?
if rs.ProposalBlockParts.HasHeader(prs.ProposalBlockPartsHeader) {
if index, ok := rs.ProposalBlockParts.BitArray().Sub(prs.ProposalBlockParts.Copy()).PickRandom(); ok {
part := rs.ProposalBlockParts.GetPart(index)
msg := &BlockPartMessage{
Height: rs.Height, // This tells peer that this part applies to us.
Round: rs.Round, // This tells peer that this part applies to us.
Part: part,
}
logger.Debug("Sending block part", "height", prs.Height, "round", prs.Round)
if peer.Send(DataChannel, struct{ ConsensusMessage }{msg}) {
ps.SetHasProposalBlockPart(prs.Height, prs.Round, index)
}
continue OUTER_LOOP
}
}
// If the peer is on a previous height, help catch up.
if (0 < prs.Height) && (prs.Height < rs.Height) {
heightLogger := logger.With("height", prs.Height)
// if we never received the commit message from the peer, the block parts wont be initialized
if prs.ProposalBlockParts == nil {
blockMeta := conR.conS.blockStore.LoadBlockMeta(prs.Height)
if blockMeta == nil {
cmn.PanicCrisis(cmn.Fmt("Failed to load block %d when blockStore is at %d",
prs.Height, conR.conS.blockStore.Height()))
}
ps.InitProposalBlockParts(blockMeta.BlockID.PartsHeader)
// continue the loop since prs is a copy and not effected by this initialization
continue OUTER_LOOP
}
conR.gossipDataForCatchup(heightLogger, rs, prs, ps, peer)
continue OUTER_LOOP
}
// If height and round don't match, sleep.
if (rs.Height != prs.Height) || (rs.Round != prs.Round) {
//logger.Info("Peer Height|Round mismatch, sleeping", "peerHeight", prs.Height, "peerRound", prs.Round, "peer", peer)
time.Sleep(conR.conS.config.PeerGossipSleep())
continue OUTER_LOOP
}
// By here, height and round match.
// Proposal block parts were already matched and sent if any were wanted.
// (These can match on hash so the round doesn't matter)
// Now consider sending other things, like the Proposal itself.
// Send Proposal && ProposalPOL BitArray?
if rs.Proposal != nil && !prs.Proposal {
// Proposal: share the proposal metadata with peer.
{
msg := &ProposalMessage{Proposal: rs.Proposal}
logger.Debug("Sending proposal", "height", prs.Height, "round", prs.Round)
if peer.Send(DataChannel, struct{ ConsensusMessage }{msg}) {
ps.SetHasProposal(rs.Proposal)
}
}
// ProposalPOL: lets peer know which POL votes we have so far.
// Peer must receive ProposalMessage first.
// rs.Proposal was validated, so rs.Proposal.POLRound <= rs.Round,
// so we definitely have rs.Votes.Prevotes(rs.Proposal.POLRound).
if 0 <= rs.Proposal.POLRound {
msg := &ProposalPOLMessage{
Height: rs.Height,
ProposalPOLRound: rs.Proposal.POLRound,
ProposalPOL: rs.Votes.Prevotes(rs.Proposal.POLRound).BitArray(),
}
logger.Debug("Sending POL", "height", prs.Height, "round", prs.Round)
peer.Send(DataChannel, struct{ ConsensusMessage }{msg})
}
continue OUTER_LOOP
}
// Nothing to do. Sleep.
time.Sleep(conR.conS.config.PeerGossipSleep())
continue OUTER_LOOP
}
}
func (conR *ConsensusReactor) gossipDataForCatchup(logger log.Logger, rs *cstypes.RoundState,
prs *cstypes.PeerRoundState, ps *PeerState, peer p2p.Peer) {
if index, ok := prs.ProposalBlockParts.Not().PickRandom(); ok {
// Ensure that the peer's PartSetHeader is correct
blockMeta := conR.conS.blockStore.LoadBlockMeta(prs.Height)
if blockMeta == nil {
logger.Error("Failed to load block meta",
"ourHeight", rs.Height, "blockstoreHeight", conR.conS.blockStore.Height())
time.Sleep(conR.conS.config.PeerGossipSleep())
return
} else if !blockMeta.BlockID.PartsHeader.Equals(prs.ProposalBlockPartsHeader) {
logger.Info("Peer ProposalBlockPartsHeader mismatch, sleeping",
"blockPartsHeader", blockMeta.BlockID.PartsHeader, "peerBlockPartsHeader", prs.ProposalBlockPartsHeader)
time.Sleep(conR.conS.config.PeerGossipSleep())
return
}
// Load the part
part := conR.conS.blockStore.LoadBlockPart(prs.Height, index)
if part == nil {
logger.Error("Could not load part", "index", index,
"blockPartsHeader", blockMeta.BlockID.PartsHeader, "peerBlockPartsHeader", prs.ProposalBlockPartsHeader)
time.Sleep(conR.conS.config.PeerGossipSleep())
return
}
// Send the part
msg := &BlockPartMessage{
Height: prs.Height, // Not our height, so it doesn't matter.
Round: prs.Round, // Not our height, so it doesn't matter.
Part: part,
}
logger.Debug("Sending block part for catchup", "round", prs.Round, "index", index)
if peer.Send(DataChannel, struct{ ConsensusMessage }{msg}) {
ps.SetHasProposalBlockPart(prs.Height, prs.Round, index)
} else {
logger.Debug("Sending block part for catchup failed")
}
return
} else {
//logger.Info("No parts to send in catch-up, sleeping")
time.Sleep(conR.conS.config.PeerGossipSleep())
return
}
}
func (conR *ConsensusReactor) gossipVotesRoutine(peer p2p.Peer, ps *PeerState) {
logger := conR.Logger.With("peer", peer)
// Simple hack to throttle logs upon sleep.
var sleeping = 0
OUTER_LOOP:
for {
// Manage disconnects from self or peer.
if !peer.IsRunning() || !conR.IsRunning() {
logger.Info("Stopping gossipVotesRoutine for peer")
return
}
rs := conR.conS.GetRoundState()
prs := ps.GetRoundState()
switch sleeping {
case 1: // First sleep
sleeping = 2
case 2: // No more sleep
sleeping = 0
}
//logger.Debug("gossipVotesRoutine", "rsHeight", rs.Height, "rsRound", rs.Round,
// "prsHeight", prs.Height, "prsRound", prs.Round, "prsStep", prs.Step)
// If height matches, then send LastCommit, Prevotes, Precommits.
if rs.Height == prs.Height {
heightLogger := logger.With("height", prs.Height)
if conR.gossipVotesForHeight(heightLogger, rs, prs, ps) {
continue OUTER_LOOP
}
}
// Special catchup logic.
// If peer is lagging by height 1, send LastCommit.
if prs.Height != 0 && rs.Height == prs.Height+1 {
if ps.PickSendVote(rs.LastCommit) {
logger.Debug("Picked rs.LastCommit to send", "height", prs.Height)
continue OUTER_LOOP
}
}
// Catchup logic
// If peer is lagging by more than 1, send Commit.
if prs.Height != 0 && rs.Height >= prs.Height+2 {
// Load the block commit for prs.Height,
// which contains precommit signatures for prs.Height.
commit := conR.conS.blockStore.LoadBlockCommit(prs.Height)
logger.Info("Loaded BlockCommit for catch-up", "height", prs.Height, "commit", commit)
if ps.PickSendVote(commit) {
logger.Debug("Picked Catchup commit to send", "height", prs.Height)
continue OUTER_LOOP
}
}
if sleeping == 0 {
// We sent nothing. Sleep...
sleeping = 1
logger.Debug("No votes to send, sleeping", "rs.Height", rs.Height, "prs.Height", prs.Height,
"localPV", rs.Votes.Prevotes(rs.Round).BitArray(), "peerPV", prs.Prevotes,
"localPC", rs.Votes.Precommits(rs.Round).BitArray(), "peerPC", prs.Precommits)
} else if sleeping == 2 {
// Continued sleep...
sleeping = 1
}
time.Sleep(conR.conS.config.PeerGossipSleep())
continue OUTER_LOOP
}
}
func (conR *ConsensusReactor) gossipVotesForHeight(logger log.Logger, rs *cstypes.RoundState, prs *cstypes.PeerRoundState, ps *PeerState) bool {
// If there are lastCommits to send...
if prs.Step == cstypes.RoundStepNewHeight {
if ps.PickSendVote(rs.LastCommit) {
logger.Debug("Picked rs.LastCommit to send")
return true
}
}
// If there are prevotes to send...
if prs.Step <= cstypes.RoundStepPrevote && prs.Round != -1 && prs.Round <= rs.Round {
if ps.PickSendVote(rs.Votes.Prevotes(prs.Round)) {
logger.Debug("Picked rs.Prevotes(prs.Round) to send", "round", prs.Round)
return true
}
}
// If there are precommits to send...
if prs.Step <= cstypes.RoundStepPrecommit && prs.Round != -1 && prs.Round <= rs.Round {
if ps.PickSendVote(rs.Votes.Precommits(prs.Round)) {
logger.Debug("Picked rs.Precommits(prs.Round) to send", "round", prs.Round)
return true
}
}
// If there are POLPrevotes to send...
if prs.ProposalPOLRound != -1 {
if polPrevotes := rs.Votes.Prevotes(prs.ProposalPOLRound); polPrevotes != nil {
if ps.PickSendVote(polPrevotes) {
logger.Debug("Picked rs.Prevotes(prs.ProposalPOLRound) to send",
"round", prs.ProposalPOLRound)
return true
}
}
}
return false
}
// NOTE: `queryMaj23Routine` has a simple crude design since it only comes
// into play for liveness when there's a signature DDoS attack happening.
func (conR *ConsensusReactor) queryMaj23Routine(peer p2p.Peer, ps *PeerState) {
logger := conR.Logger.With("peer", peer)
OUTER_LOOP:
for {
// Manage disconnects from self or peer.
if !peer.IsRunning() || !conR.IsRunning() {
logger.Info("Stopping queryMaj23Routine for peer")
return
}
// Maybe send Height/Round/Prevotes
{
rs := conR.conS.GetRoundState()
prs := ps.GetRoundState()
if rs.Height == prs.Height {
if maj23, ok := rs.Votes.Prevotes(prs.Round).TwoThirdsMajority(); ok {
peer.TrySend(StateChannel, struct{ ConsensusMessage }{&VoteSetMaj23Message{
Height: prs.Height,
Round: prs.Round,
Type: types.VoteTypePrevote,
BlockID: maj23,
}})
time.Sleep(conR.conS.config.PeerQueryMaj23Sleep())
}
}
}
// Maybe send Height/Round/Precommits
{
rs := conR.conS.GetRoundState()
prs := ps.GetRoundState()
if rs.Height == prs.Height {
if maj23, ok := rs.Votes.Precommits(prs.Round).TwoThirdsMajority(); ok {
peer.TrySend(StateChannel, struct{ ConsensusMessage }{&VoteSetMaj23Message{
Height: prs.Height,
Round: prs.Round,
Type: types.VoteTypePrecommit,
BlockID: maj23,
}})
time.Sleep(conR.conS.config.PeerQueryMaj23Sleep())
}
}
}
// Maybe send Height/Round/ProposalPOL
{
rs := conR.conS.GetRoundState()
prs := ps.GetRoundState()
if rs.Height == prs.Height && prs.ProposalPOLRound >= 0 {
if maj23, ok := rs.Votes.Prevotes(prs.ProposalPOLRound).TwoThirdsMajority(); ok {
peer.TrySend(StateChannel, struct{ ConsensusMessage }{&VoteSetMaj23Message{
Height: prs.Height,
Round: prs.ProposalPOLRound,
Type: types.VoteTypePrevote,
BlockID: maj23,
}})
time.Sleep(conR.conS.config.PeerQueryMaj23Sleep())
}
}
}
// Little point sending LastCommitRound/LastCommit,
// These are fleeting and non-blocking.
// Maybe send Height/CatchupCommitRound/CatchupCommit.
{
prs := ps.GetRoundState()
if prs.CatchupCommitRound != -1 && 0 < prs.Height && prs.Height <= conR.conS.blockStore.Height() {
commit := conR.conS.LoadCommit(prs.Height)
peer.TrySend(StateChannel, struct{ ConsensusMessage }{&VoteSetMaj23Message{
Height: prs.Height,
Round: commit.Round(),
Type: types.VoteTypePrecommit,
BlockID: commit.BlockID,
}})
time.Sleep(conR.conS.config.PeerQueryMaj23Sleep())
}
}
time.Sleep(conR.conS.config.PeerQueryMaj23Sleep())
continue OUTER_LOOP
}
}
// String returns a string representation of the ConsensusReactor.
// NOTE: For now, it is just a hard-coded string to avoid accessing unprotected shared variables.
// TODO: improve!
func (conR *ConsensusReactor) String() string {
// better not to access shared variables
return "ConsensusReactor" // conR.StringIndented("")
}
// StringIndented returns an indented string representation of the ConsensusReactor
func (conR *ConsensusReactor) StringIndented(indent string) string {
s := "ConsensusReactor{\n"
s += indent + " " + conR.conS.StringIndented(indent+" ") + "\n"
for _, peer := range conR.Switch.Peers().List() {
ps := peer.Get(types.PeerStateKey).(*PeerState)
s += indent + " " + ps.StringIndented(indent+" ") + "\n"
}
s += indent + "}"
return s
}
//-----------------------------------------------------------------------------
var (
ErrPeerStateHeightRegression = errors.New("Error peer state height regression")
ErrPeerStateInvalidStartTime = errors.New("Error peer state invalid startTime")
)
// PeerState contains the known state of a peer, including its connection
// and threadsafe access to its PeerRoundState.
type PeerState struct {
Peer p2p.Peer
logger log.Logger
mtx sync.Mutex
cstypes.PeerRoundState
}
// NewPeerState returns a new PeerState for the given Peer
func NewPeerState(peer p2p.Peer) *PeerState {
return &PeerState{
Peer: peer,
logger: log.NewNopLogger(),
PeerRoundState: cstypes.PeerRoundState{
Round: -1,
ProposalPOLRound: -1,
LastCommitRound: -1,
CatchupCommitRound: -1,
},
}
}
func (ps *PeerState) SetLogger(logger log.Logger) *PeerState {
ps.logger = logger
return ps
}
// GetRoundState returns an atomic snapshot of the PeerRoundState.
// There's no point in mutating it since it won't change PeerState.
func (ps *PeerState) GetRoundState() *cstypes.PeerRoundState {
ps.mtx.Lock()
defer ps.mtx.Unlock()
prs := ps.PeerRoundState // copy
return &prs
}
// GetHeight returns an atomic snapshot of the PeerRoundState's height
// used by the mempool to ensure peers are caught up before broadcasting new txs
func (ps *PeerState) GetHeight() int64 {
ps.mtx.Lock()
defer ps.mtx.Unlock()
return ps.PeerRoundState.Height
}
// SetHasProposal sets the given proposal as known for the peer.
func (ps *PeerState) SetHasProposal(proposal *types.Proposal) {
ps.mtx.Lock()
defer ps.mtx.Unlock()
if ps.Height != proposal.Height || ps.Round != proposal.Round {
return
}
if ps.Proposal {
return
}
ps.Proposal = true
ps.ProposalBlockPartsHeader = proposal.BlockPartsHeader
ps.ProposalBlockParts = cmn.NewBitArray(proposal.BlockPartsHeader.Total)
ps.ProposalPOLRound = proposal.POLRound
ps.ProposalPOL = nil // Nil until ProposalPOLMessage received.
}
// InitProposalBlockParts initializes the peer's proposal block parts header and bit array.
func (ps *PeerState) InitProposalBlockParts(partsHeader types.PartSetHeader) {
ps.mtx.Lock()
defer ps.mtx.Unlock()
if ps.ProposalBlockParts != nil {
return
}
ps.ProposalBlockPartsHeader = partsHeader
ps.ProposalBlockParts = cmn.NewBitArray(partsHeader.Total)
}
// SetHasProposalBlockPart sets the given block part index as known for the peer.
func (ps *PeerState) SetHasProposalBlockPart(height int64, round int, index int) {
ps.mtx.Lock()
defer ps.mtx.Unlock()
if ps.Height != height || ps.Round != round {
return
}
ps.ProposalBlockParts.SetIndex(index, true)
}
// PickSendVote picks a vote and sends it to the peer.
// Returns true if vote was sent.
func (ps *PeerState) PickSendVote(votes types.VoteSetReader) bool {
if vote, ok := ps.PickVoteToSend(votes); ok {
msg := &VoteMessage{vote}
ps.logger.Debug("Sending vote message", "ps", ps, "vote", vote)
return ps.Peer.Send(VoteChannel, struct{ ConsensusMessage }{msg})
}
return false
}
// PickVoteToSend picks a vote to send to the peer.
// Returns true if a vote was picked.
// NOTE: `votes` must be the correct Size() for the Height().
func (ps *PeerState) PickVoteToSend(votes types.VoteSetReader) (vote *types.Vote, ok bool) {
ps.mtx.Lock()
defer ps.mtx.Unlock()
if votes.Size() == 0 {
return nil, false
}
height, round, type_, size := votes.Height(), votes.Round(), votes.Type(), votes.Size()
// Lazily set data using 'votes'.
if votes.IsCommit() {
ps.ensureCatchupCommitRound(height, round, size)
}
ps.ensureVoteBitArrays(height, size)
psVotes := ps.getVoteBitArray(height, round, type_)
if psVotes == nil {
return nil, false // Not something worth sending
}
if index, ok := votes.BitArray().Sub(psVotes).PickRandom(); ok {
ps.setHasVote(height, round, type_, index)
return votes.GetByIndex(index), true
}
return nil, false
}
func (ps *PeerState) getVoteBitArray(height int64, round int, type_ byte) *cmn.BitArray {
if !types.IsVoteTypeValid(type_) {
return nil
}
if ps.Height == height {
if ps.Round == round {
switch type_ {
case types.VoteTypePrevote:
return ps.Prevotes
case types.VoteTypePrecommit:
return ps.Precommits
}
}
if ps.CatchupCommitRound == round {
switch type_ {
case types.VoteTypePrevote:
return nil
case types.VoteTypePrecommit:
return ps.CatchupCommit
}
}
if ps.ProposalPOLRound == round {
switch type_ {
case types.VoteTypePrevote:
return ps.ProposalPOL
case types.VoteTypePrecommit:
return nil
}
}
return nil
}
if ps.Height == height+1 {
if ps.LastCommitRound == round {
switch type_ {
case types.VoteTypePrevote:
return nil
case types.VoteTypePrecommit:
return ps.LastCommit
}
}
return nil
}
return nil
}
// 'round': A round for which we have a +2/3 commit.
func (ps *PeerState) ensureCatchupCommitRound(height int64, round int, numValidators int) {
if ps.Height != height {
return
}
/*
NOTE: This is wrong, 'round' could change.
e.g. if orig round is not the same as block LastCommit round.
if ps.CatchupCommitRound != -1 && ps.CatchupCommitRound != round {
cmn.PanicSanity(cmn.Fmt("Conflicting CatchupCommitRound. Height: %v, Orig: %v, New: %v", height, ps.CatchupCommitRound, round))
}
*/
if ps.CatchupCommitRound == round {
return // Nothing to do!
}
ps.CatchupCommitRound = round
if round == ps.Round {
ps.CatchupCommit = ps.Precommits
} else {
ps.CatchupCommit = cmn.NewBitArray(numValidators)
}
}
// EnsureVoteVitArrays ensures the bit-arrays have been allocated for tracking
// what votes this peer has received.
// NOTE: It's important to make sure that numValidators actually matches
// what the node sees as the number of validators for height.
func (ps *PeerState) EnsureVoteBitArrays(height int64, numValidators int) {
ps.mtx.Lock()
defer ps.mtx.Unlock()
ps.ensureVoteBitArrays(height, numValidators)
}
func (ps *PeerState) ensureVoteBitArrays(height int64, numValidators int) {
if ps.Height == height {
if ps.Prevotes == nil {
ps.Prevotes = cmn.NewBitArray(numValidators)
}
if ps.Precommits == nil {
ps.Precommits = cmn.NewBitArray(numValidators)
}
if ps.CatchupCommit == nil {
ps.CatchupCommit = cmn.NewBitArray(numValidators)
}
if ps.ProposalPOL == nil {
ps.ProposalPOL = cmn.NewBitArray(numValidators)
}
} else if ps.Height == height+1 {
if ps.LastCommit == nil {
ps.LastCommit = cmn.NewBitArray(numValidators)
}
}
}
// SetHasVote sets the given vote as known by the peer
func (ps *PeerState) SetHasVote(vote *types.Vote) {
ps.mtx.Lock()
defer ps.mtx.Unlock()
ps.setHasVote(vote.Height, vote.Round, vote.Type, vote.ValidatorIndex)
}
func (ps *PeerState) setHasVote(height int64, round int, type_ byte, index int) {
logger := ps.logger.With("peerH/R", cmn.Fmt("%d/%d", ps.Height, ps.Round), "H/R", cmn.Fmt("%d/%d", height, round))
logger.Debug("setHasVote", "type", type_, "index", index)
// NOTE: some may be nil BitArrays -> no side effects.
psVotes := ps.getVoteBitArray(height, round, type_)
if psVotes != nil {
psVotes.SetIndex(index, true)
}
}
// ApplyNewRoundStepMessage updates the peer state for the new round.
func (ps *PeerState) ApplyNewRoundStepMessage(msg *NewRoundStepMessage) {
ps.mtx.Lock()
defer ps.mtx.Unlock()
// Ignore duplicates or decreases
if CompareHRS(msg.Height, msg.Round, msg.Step, ps.Height, ps.Round, ps.Step) <= 0 {
return
}
// Just remember these values.
psHeight := ps.Height
psRound := ps.Round
//psStep := ps.Step
psCatchupCommitRound := ps.CatchupCommitRound
psCatchupCommit := ps.CatchupCommit
startTime := time.Now().Add(-1 * time.Duration(msg.SecondsSinceStartTime) * time.Second)
ps.Height = msg.Height
ps.Round = msg.Round
ps.Step = msg.Step
ps.StartTime = startTime
if psHeight != msg.Height || psRound != msg.Round {
ps.Proposal = false
ps.ProposalBlockPartsHeader = types.PartSetHeader{}
ps.ProposalBlockParts = nil
ps.ProposalPOLRound = -1
ps.ProposalPOL = nil
// We'll update the BitArray capacity later.
ps.Prevotes = nil
ps.Precommits = nil
}
if psHeight == msg.Height && psRound != msg.Round && msg.Round == psCatchupCommitRound {
// Peer caught up to CatchupCommitRound.
// Preserve psCatchupCommit!
// NOTE: We prefer to use prs.Precommits if
// pr.Round matches pr.CatchupCommitRound.
ps.Precommits = psCatchupCommit
}
if psHeight != msg.Height {
// Shift Precommits to LastCommit.
if psHeight+1 == msg.Height && psRound == msg.LastCommitRound {
ps.LastCommitRound = msg.LastCommitRound
ps.LastCommit = ps.Precommits
} else {
ps.LastCommitRound = msg.LastCommitRound
ps.LastCommit = nil
}
// We'll update the BitArray capacity later.
ps.CatchupCommitRound = -1
ps.CatchupCommit = nil
}
}
// ApplyCommitStepMessage updates the peer state for the new commit.
func (ps *PeerState) ApplyCommitStepMessage(msg *CommitStepMessage) {
ps.mtx.Lock()
defer ps.mtx.Unlock()
if ps.Height != msg.Height {
return
}
ps.ProposalBlockPartsHeader = msg.BlockPartsHeader
ps.ProposalBlockParts = msg.BlockParts
}
// ApplyProposalPOLMessage updates the peer state for the new proposal POL.
func (ps *PeerState) ApplyProposalPOLMessage(msg *ProposalPOLMessage) {
ps.mtx.Lock()
defer ps.mtx.Unlock()
if ps.Height != msg.Height {
return
}
if ps.ProposalPOLRound != msg.ProposalPOLRound {
return
}
// TODO: Merge onto existing ps.ProposalPOL?
// We might have sent some prevotes in the meantime.
ps.ProposalPOL = msg.ProposalPOL
}
// ApplyHasVoteMessage updates the peer state for the new vote.
func (ps *PeerState) ApplyHasVoteMessage(msg *HasVoteMessage) {
ps.mtx.Lock()
defer ps.mtx.Unlock()
if ps.Height != msg.Height {
return
}
ps.setHasVote(msg.Height, msg.Round, msg.Type, msg.Index)
}
// ApplyVoteSetBitsMessage updates the peer state for the bit-array of votes
// it claims to have for the corresponding BlockID.
// `ourVotes` is a BitArray of votes we have for msg.BlockID
// NOTE: if ourVotes is nil (e.g. msg.Height < rs.Height),
// we conservatively overwrite ps's votes w/ msg.Votes.
func (ps *PeerState) ApplyVoteSetBitsMessage(msg *VoteSetBitsMessage, ourVotes *cmn.BitArray) {
ps.mtx.Lock()
defer ps.mtx.Unlock()
votes := ps.getVoteBitArray(msg.Height, msg.Round, msg.Type)
if votes != nil {
if ourVotes == nil {
votes.Update(msg.Votes)
} else {
otherVotes := votes.Sub(ourVotes)
hasVotes := otherVotes.Or(msg.Votes)
votes.Update(hasVotes)
}
}
}
// String returns a string representation of the PeerState
func (ps *PeerState) String() string {
return ps.StringIndented("")
}
// StringIndented returns a string representation of the PeerState
func (ps *PeerState) StringIndented(indent string) string {
ps.mtx.Lock()
defer ps.mtx.Unlock()
return fmt.Sprintf(`PeerState{
%s Key %v
%s PRS %v
%s}`,
indent, ps.Peer.Key(),
indent, ps.PeerRoundState.StringIndented(indent+" "),
indent)
}
//-----------------------------------------------------------------------------
// Messages
const (
msgTypeNewRoundStep = byte(0x01)
msgTypeCommitStep = byte(0x02)
msgTypeProposal = byte(0x11)
msgTypeProposalPOL = byte(0x12)
msgTypeBlockPart = byte(0x13) // both block & POL
msgTypeVote = byte(0x14)
msgTypeHasVote = byte(0x15)
msgTypeVoteSetMaj23 = byte(0x16)
msgTypeVoteSetBits = byte(0x17)
msgTypeProposalHeartbeat = byte(0x20)
)
// ConsensusMessage is a message that can be sent and received on the ConsensusReactor
type ConsensusMessage interface{}
var _ = wire.RegisterInterface(
struct{ ConsensusMessage }{},
wire.ConcreteType{&NewRoundStepMessage{}, msgTypeNewRoundStep},
wire.ConcreteType{&CommitStepMessage{}, msgTypeCommitStep},
wire.ConcreteType{&ProposalMessage{}, msgTypeProposal},
wire.ConcreteType{&ProposalPOLMessage{}, msgTypeProposalPOL},
wire.ConcreteType{&BlockPartMessage{}, msgTypeBlockPart},
wire.ConcreteType{&VoteMessage{}, msgTypeVote},
wire.ConcreteType{&HasVoteMessage{}, msgTypeHasVote},
wire.ConcreteType{&VoteSetMaj23Message{}, msgTypeVoteSetMaj23},
wire.ConcreteType{&VoteSetBitsMessage{}, msgTypeVoteSetBits},
wire.ConcreteType{&ProposalHeartbeatMessage{}, msgTypeProposalHeartbeat},
)
// DecodeMessage decodes the given bytes into a ConsensusMessage.
// TODO: check for unnecessary extra bytes at the end.
func DecodeMessage(bz []byte) (msgType byte, msg ConsensusMessage, err error) {
msgType = bz[0]
n := new(int)
r := bytes.NewReader(bz)
msgI := wire.ReadBinary(struct{ ConsensusMessage }{}, r, maxConsensusMessageSize, n, &err)
msg = msgI.(struct{ ConsensusMessage }).ConsensusMessage
return
}
//-------------------------------------
// NewRoundStepMessage is sent for every step taken in the ConsensusState.
// For every height/round/step transition
type NewRoundStepMessage struct {
Height int64
Round int
Step cstypes.RoundStepType
SecondsSinceStartTime int
LastCommitRound int
}
// String returns a string representation.
func (m *NewRoundStepMessage) String() string {
return fmt.Sprintf("[NewRoundStep H:%v R:%v S:%v LCR:%v]",
m.Height, m.Round, m.Step, m.LastCommitRound)
}
//-------------------------------------
// CommitStepMessage is sent when a block is committed.
type CommitStepMessage struct {
Height int64
BlockPartsHeader types.PartSetHeader
BlockParts *cmn.BitArray
}
// String returns a string representation.
func (m *CommitStepMessage) String() string {
return fmt.Sprintf("[CommitStep H:%v BP:%v BA:%v]", m.Height, m.BlockPartsHeader, m.BlockParts)
}
//-------------------------------------
// ProposalMessage is sent when a new block is proposed.
type ProposalMessage struct {
Proposal *types.Proposal
}
// String returns a string representation.
func (m *ProposalMessage) String() string {
return fmt.Sprintf("[Proposal %v]", m.Proposal)
}
//-------------------------------------
// ProposalPOLMessage is sent when a previous proposal is re-proposed.
type ProposalPOLMessage struct {
Height int64
ProposalPOLRound int
ProposalPOL *cmn.BitArray
}
// String returns a string representation.
func (m *ProposalPOLMessage) String() string {
return fmt.Sprintf("[ProposalPOL H:%v POLR:%v POL:%v]", m.Height, m.ProposalPOLRound, m.ProposalPOL)
}
//-------------------------------------
// BlockPartMessage is sent when gossipping a piece of the proposed block.
type BlockPartMessage struct {
Height int64
Round int
Part *types.Part
}
// String returns a string representation.
func (m *BlockPartMessage) String() string {
return fmt.Sprintf("[BlockPart H:%v R:%v P:%v]", m.Height, m.Round, m.Part)
}
//-------------------------------------
// VoteMessage is sent when voting for a proposal (or lack thereof).
type VoteMessage struct {
Vote *types.Vote
}
// String returns a string representation.
func (m *VoteMessage) String() string {
return fmt.Sprintf("[Vote %v]", m.Vote)
}
//-------------------------------------
// HasVoteMessage is sent to indicate that a particular vote has been received.
type HasVoteMessage struct {
Height int64
Round int
Type byte
Index int
}
// String returns a string representation.
func (m *HasVoteMessage) String() string {
return fmt.Sprintf("[HasVote VI:%v V:{%v/%02d/%v}]", m.Index, m.Height, m.Round, m.Type)
}
//-------------------------------------
// VoteSetMaj23Message is sent to indicate that a given BlockID has seen +2/3 votes.
type VoteSetMaj23Message struct {
Height int64
Round int
Type byte
BlockID types.BlockID
}
// String returns a string representation.
func (m *VoteSetMaj23Message) String() string {
return fmt.Sprintf("[VSM23 %v/%02d/%v %v]", m.Height, m.Round, m.Type, m.BlockID)
}
//-------------------------------------
// VoteSetBitsMessage is sent to communicate the bit-array of votes seen for the BlockID.
type VoteSetBitsMessage struct {
Height int64
Round int
Type byte
BlockID types.BlockID
Votes *cmn.BitArray
}
// String returns a string representation.
func (m *VoteSetBitsMessage) String() string {
return fmt.Sprintf("[VSB %v/%02d/%v %v %v]", m.Height, m.Round, m.Type, m.BlockID, m.Votes)
}
//-------------------------------------
// ProposalHeartbeatMessage is sent to signal that a node is alive and waiting for transactions for a proposal.
type ProposalHeartbeatMessage struct {
Heartbeat *types.Heartbeat
}
// String returns a string representation.
func (m *ProposalHeartbeatMessage) String() string {
return fmt.Sprintf("[HEARTBEAT %v]", m.Heartbeat)
}