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tendermint/consensus/state.go

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package consensus
import (
"bytes"
"errors"
"fmt"
"reflect"
"sync"
"time"
. "github.com/tendermint/go-common"
cfg "github.com/tendermint/go-config"
"github.com/tendermint/go-wire"
bc "github.com/tendermint/tendermint/blockchain"
mempl "github.com/tendermint/tendermint/mempool"
"github.com/tendermint/tendermint/proxy"
sm "github.com/tendermint/tendermint/state"
"github.com/tendermint/tendermint/types"
)
//-----------------------------------------------------------------------------
// Timeout Parameters
// All in milliseconds
type TimeoutParams struct {
Propose0 int
ProposeDelta int
Prevote0 int
PrevoteDelta int
Precommit0 int
PrecommitDelta int
Commit0 int
}
// Wait this long for a proposal
func (tp *TimeoutParams) Propose(round int) time.Duration {
return time.Duration(tp.Propose0+tp.ProposeDelta*round) * time.Millisecond
}
// After receiving any +2/3 prevote, wait this long for stragglers
func (tp *TimeoutParams) Prevote(round int) time.Duration {
return time.Duration(tp.Prevote0+tp.PrevoteDelta*round) * time.Millisecond
}
// After receiving any +2/3 precommits, wait this long for stragglers
func (tp *TimeoutParams) Precommit(round int) time.Duration {
return time.Duration(tp.Precommit0+tp.PrecommitDelta*round) * time.Millisecond
}
// After receiving +2/3 precommits for a single block (a commit), wait this long for stragglers in the next height's RoundStepNewHeight
func (tp *TimeoutParams) Commit(t time.Time) time.Time {
return t.Add(time.Duration(tp.Commit0) * time.Millisecond)
}
// Initialize parameters from config
func InitTimeoutParamsFromConfig(config cfg.Config) *TimeoutParams {
return &TimeoutParams{
Propose0: config.GetInt("timeout_propose"),
ProposeDelta: config.GetInt("timeout_propose_delta"),
Prevote0: config.GetInt("timeout_prevote"),
PrevoteDelta: config.GetInt("timeout_prevote_delta"),
Precommit0: config.GetInt("timeout_precommit"),
PrecommitDelta: config.GetInt("timeout_precommit_delta"),
Commit0: config.GetInt("timeout_commit"),
}
}
//-----------------------------------------------------------------------------
// Errors
var (
ErrInvalidProposalSignature = errors.New("Error invalid proposal signature")
ErrInvalidProposalPOLRound = errors.New("Error invalid proposal POL round")
ErrAddingVote = errors.New("Error adding vote")
ErrVoteHeightMismatch = errors.New("Error vote height mismatch")
)
//-----------------------------------------------------------------------------
// RoundStepType enum type
type RoundStepType uint8 // These must be numeric, ordered.
const (
RoundStepNewHeight = RoundStepType(0x01) // Wait til CommitTime + timeoutCommit
RoundStepNewRound = RoundStepType(0x02) // Setup new round and go to RoundStepPropose
RoundStepPropose = RoundStepType(0x03) // Did propose, gossip proposal
RoundStepPrevote = RoundStepType(0x04) // Did prevote, gossip prevotes
RoundStepPrevoteWait = RoundStepType(0x05) // Did receive any +2/3 prevotes, start timeout
RoundStepPrecommit = RoundStepType(0x06) // Did precommit, gossip precommits
RoundStepPrecommitWait = RoundStepType(0x07) // Did receive any +2/3 precommits, start timeout
RoundStepCommit = RoundStepType(0x08) // Entered commit state machine
// NOTE: RoundStepNewHeight acts as RoundStepCommitWait.
)
func (rs RoundStepType) String() string {
switch rs {
case RoundStepNewHeight:
return "RoundStepNewHeight"
case RoundStepNewRound:
return "RoundStepNewRound"
case RoundStepPropose:
return "RoundStepPropose"
case RoundStepPrevote:
return "RoundStepPrevote"
case RoundStepPrevoteWait:
return "RoundStepPrevoteWait"
case RoundStepPrecommit:
return "RoundStepPrecommit"
case RoundStepPrecommitWait:
return "RoundStepPrecommitWait"
case RoundStepCommit:
return "RoundStepCommit"
default:
return "RoundStepUnknown" // Cannot panic.
}
}
//-----------------------------------------------------------------------------
// Immutable when returned from ConsensusState.GetRoundState()
type RoundState struct {
Height int // Height we are working on
Round int
Step RoundStepType
StartTime time.Time
CommitTime time.Time // Subjective time when +2/3 precommits for Block at Round were found
Validators *types.ValidatorSet
Proposal *types.Proposal
ProposalBlock *types.Block
ProposalBlockParts *types.PartSet
LockedRound int
LockedBlock *types.Block
LockedBlockParts *types.PartSet
Votes *HeightVoteSet
CommitRound int //
LastCommit *types.VoteSet // Last precommits at Height-1
LastValidators *types.ValidatorSet
}
func (rs *RoundState) RoundStateEvent() types.EventDataRoundState {
edrs := types.EventDataRoundState{
Height: rs.Height,
Round: rs.Round,
Step: rs.Step.String(),
RoundState: rs,
}
return edrs
}
func (rs *RoundState) String() string {
return rs.StringIndented("")
}
func (rs *RoundState) StringIndented(indent string) string {
return fmt.Sprintf(`RoundState{
%s H:%v R:%v S:%v
%s StartTime: %v
%s CommitTime: %v
%s Validators: %v
%s Proposal: %v
%s ProposalBlock: %v %v
%s LockedRound: %v
%s LockedBlock: %v %v
%s Votes: %v
%s LastCommit: %v
%s LastValidators: %v
%s}`,
indent, rs.Height, rs.Round, rs.Step,
indent, rs.StartTime,
indent, rs.CommitTime,
indent, rs.Validators.StringIndented(indent+" "),
indent, rs.Proposal,
indent, rs.ProposalBlockParts.StringShort(), rs.ProposalBlock.StringShort(),
indent, rs.LockedRound,
indent, rs.LockedBlockParts.StringShort(), rs.LockedBlock.StringShort(),
indent, rs.Votes.StringIndented(indent+" "),
indent, rs.LastCommit.StringShort(),
indent, rs.LastValidators.StringIndented(indent+" "),
indent)
}
func (rs *RoundState) StringShort() string {
return fmt.Sprintf(`RoundState{H:%v R:%v S:%v ST:%v}`,
rs.Height, rs.Round, rs.Step, rs.StartTime)
}
//-----------------------------------------------------------------------------
var (
msgQueueSize = 1000
tickTockBufferSize = 10
)
// msgs from the reactor which may update the state
type msgInfo struct {
Msg ConsensusMessage `json:"msg"`
PeerKey string `json:"peer_key"`
}
// internally generated messages which may update the state
type timeoutInfo struct {
Duration time.Duration `json:"duration"`
Height int `json:"height"`
Round int `json:"round"`
Step RoundStepType `json:"step"`
}
func (ti *timeoutInfo) String() string {
return fmt.Sprintf("%v ; %d/%d %v", ti.Duration, ti.Height, ti.Round, ti.Step)
}
type PrivValidator interface {
GetAddress() []byte
SignVote(chainID string, vote *types.Vote) error
SignProposal(chainID string, proposal *types.Proposal) error
}
// Tracks consensus state across block heights and rounds.
type ConsensusState struct {
BaseService
config cfg.Config
proxyAppConn proxy.AppConnConsensus
blockStore *bc.BlockStore
mempool *mempl.Mempool
privValidator PrivValidator
mtx sync.Mutex
RoundState
state *sm.State // State until height-1.
peerMsgQueue chan msgInfo // serializes msgs affecting state (proposals, block parts, votes)
internalMsgQueue chan msgInfo // like peerMsgQueue but for our own proposals, parts, votes
timeoutTicker *time.Ticker // ticker for timeouts
tickChan chan timeoutInfo // start the timeoutTicker in the timeoutRoutine
tockChan chan timeoutInfo // timeouts are relayed on tockChan to the receiveRoutine
timeoutParams *TimeoutParams // parameters and functions for timeout intervals
evsw types.EventSwitch
wal *WAL
replayMode bool // so we don't log signing errors during replay
nSteps int // used for testing to limit the number of transitions the state makes
// allow certain function to be overwritten for testing
decideProposal func(height, round int)
doPrevote func(height, round int)
setProposal func(proposal *types.Proposal) error
}
func NewConsensusState(config cfg.Config, state *sm.State, proxyAppConn proxy.AppConnConsensus, blockStore *bc.BlockStore, mempool *mempl.Mempool) *ConsensusState {
cs := &ConsensusState{
config: config,
proxyAppConn: proxyAppConn,
blockStore: blockStore,
mempool: mempool,
peerMsgQueue: make(chan msgInfo, msgQueueSize),
internalMsgQueue: make(chan msgInfo, msgQueueSize),
timeoutTicker: new(time.Ticker),
tickChan: make(chan timeoutInfo, tickTockBufferSize),
tockChan: make(chan timeoutInfo, tickTockBufferSize),
timeoutParams: InitTimeoutParamsFromConfig(config),
}
// set function defaults (may be overwritten before calling Start)
cs.decideProposal = cs.defaultDecideProposal
cs.doPrevote = cs.defaultDoPrevote
cs.setProposal = cs.defaultSetProposal
cs.updateToState(state)
// Don't call scheduleRound0 yet.
// We do that upon Start().
cs.reconstructLastCommit(state)
cs.BaseService = *NewBaseService(log, "ConsensusState", cs)
return cs
}
//----------------------------------------
// Public interface
// implements events.Eventable
func (cs *ConsensusState) SetEventSwitch(evsw types.EventSwitch) {
cs.evsw = evsw
}
func (cs *ConsensusState) String() string {
// better not to access shared variables
return Fmt("ConsensusState") //(H:%v R:%v S:%v", cs.Height, cs.Round, cs.Step)
}
func (cs *ConsensusState) GetState() *sm.State {
cs.mtx.Lock()
defer cs.mtx.Unlock()
return cs.state.Copy()
}
func (cs *ConsensusState) GetRoundState() *RoundState {
cs.mtx.Lock()
defer cs.mtx.Unlock()
return cs.getRoundState()
}
func (cs *ConsensusState) getRoundState() *RoundState {
rs := cs.RoundState // copy
return &rs
}
func (cs *ConsensusState) GetValidators() (int, []*types.Validator) {
cs.mtx.Lock()
defer cs.mtx.Unlock()
return cs.state.LastBlockHeight, cs.state.Validators.Copy().Validators
}
func (cs *ConsensusState) SetPrivValidator(priv PrivValidator) {
cs.mtx.Lock()
defer cs.mtx.Unlock()
cs.privValidator = priv
}
func (cs *ConsensusState) OnStart() error {
cs.BaseService.OnStart()
walDir := cs.config.GetString("cs_wal_dir")
err := EnsureDir(walDir, 0700)
if err != nil {
log.Error("Error ensuring ConsensusState wal dir", "error", err.Error())
return err
}
err = cs.OpenWAL(walDir)
if err != nil {
log.Error("Error loading ConsensusState wal", "error", err.Error())
return err
}
// we need the timeoutRoutine for replay so
// we don't block on the tick chan.
// NOTE: we will get a build up of garbage go routines
// firing on the tockChan until the receiveRoutine is started
// to deal with them (by that point, at most one will be valid)
go cs.timeoutRoutine()
// we may have lost some votes if the process crashed
// reload from consensus log to catchup
if err := cs.catchupReplay(cs.Height); err != nil {
log.Error("Error on catchup replay", "error", err.Error())
// let's go for it anyways, maybe we're fine
}
// now start the receiveRoutine
go cs.receiveRoutine(0)
// schedule the first round!
// use GetRoundState so we don't race the receiveRoutine for access
cs.scheduleRound0(cs.GetRoundState())
return nil
}
// timeoutRoutine: receive requests for timeouts on tickChan and fire timeouts on tockChan
// receiveRoutine: serializes processing of proposoals, block parts, votes; coordinates state transitions
func (cs *ConsensusState) startRoutines(maxSteps int) {
go cs.timeoutRoutine()
go cs.receiveRoutine(maxSteps)
}
func (cs *ConsensusState) OnStop() {
cs.BaseService.OnStop()
// Make BaseService.Wait() wait until cs.wal.Wait()
if cs.wal != nil && cs.IsRunning() {
cs.wal.Wait()
}
}
// Open file to log all consensus messages and timeouts for deterministic accountability
func (cs *ConsensusState) OpenWAL(walDir string) (err error) {
cs.mtx.Lock()
defer cs.mtx.Unlock()
wal, err := NewWAL(walDir, cs.config.GetBool("cs_wal_light"))
if err != nil {
return err
}
cs.wal = wal
return nil
}
//------------------------------------------------------------
// Public interface for passing messages into the consensus state,
// possibly causing a state transition
// TODO: should these return anything or let callers just use events?
// May block on send if queue is full.
func (cs *ConsensusState) AddVote(vote *types.Vote, peerKey string) (added bool, err error) {
if peerKey == "" {
cs.internalMsgQueue <- msgInfo{&VoteMessage{vote}, ""}
} else {
cs.peerMsgQueue <- msgInfo{&VoteMessage{vote}, peerKey}
}
// TODO: wait for event?!
return false, nil
}
// May block on send if queue is full.
func (cs *ConsensusState) SetProposal(proposal *types.Proposal, peerKey string) error {
if peerKey == "" {
cs.internalMsgQueue <- msgInfo{&ProposalMessage{proposal}, ""}
} else {
cs.peerMsgQueue <- msgInfo{&ProposalMessage{proposal}, peerKey}
}
// TODO: wait for event?!
return nil
}
// May block on send if queue is full.
func (cs *ConsensusState) AddProposalBlockPart(height, round int, part *types.Part, peerKey string) error {
if peerKey == "" {
cs.internalMsgQueue <- msgInfo{&BlockPartMessage{height, round, part}, ""}
} else {
cs.peerMsgQueue <- msgInfo{&BlockPartMessage{height, round, part}, peerKey}
}
// TODO: wait for event?!
return nil
}
// May block on send if queue is full.
func (cs *ConsensusState) SetProposalAndBlock(proposal *types.Proposal, block *types.Block, parts *types.PartSet, peerKey string) error {
cs.SetProposal(proposal, peerKey)
for i := 0; i < parts.Total(); i++ {
part := parts.GetPart(i)
cs.AddProposalBlockPart(proposal.Height, proposal.Round, part, peerKey)
}
return nil // TODO errors
}
//------------------------------------------------------------
// internal functions for managing the state
func (cs *ConsensusState) updateHeight(height int) {
cs.Height = height
}
func (cs *ConsensusState) updateRoundStep(round int, step RoundStepType) {
cs.Round = round
cs.Step = step
}
// enterNewRound(height, 0) at cs.StartTime.
func (cs *ConsensusState) scheduleRound0(rs *RoundState) {
//log.Info("scheduleRound0", "now", time.Now(), "startTime", cs.StartTime)
sleepDuration := rs.StartTime.Sub(time.Now())
if sleepDuration < time.Duration(0) {
sleepDuration = time.Duration(0)
}
cs.scheduleTimeout(sleepDuration, rs.Height, 0, RoundStepNewHeight)
}
// Attempt to schedule a timeout by sending timeoutInfo on the tickChan.
// The timeoutRoutine is alwaya available to read from tickChan (it won't block).
// The scheduling may fail if the timeoutRoutine has already scheduled a timeout for a later height/round/step.
func (cs *ConsensusState) scheduleTimeout(duration time.Duration, height, round int, step RoundStepType) {
cs.tickChan <- timeoutInfo{duration, height, round, step}
}
// send a msg into the receiveRoutine regarding our own proposal, block part, or vote
func (cs *ConsensusState) sendInternalMessage(mi msgInfo) {
select {
case cs.internalMsgQueue <- mi:
default:
// NOTE: using the go-routine means our votes can
// be processed out of order.
// TODO: use CList here for strict determinism and
// attempt push to internalMsgQueue in receiveRoutine
log.Warn("Internal msg queue is full. Using a go-routine")
go func() { cs.internalMsgQueue <- mi }()
}
}
// Reconstruct LastCommit from SeenCommit, which we saved along with the block,
// (which happens even before saving the state)
func (cs *ConsensusState) reconstructLastCommit(state *sm.State) {
if state.LastBlockHeight == 0 {
return
}
seenCommit := cs.blockStore.LoadSeenCommit(state.LastBlockHeight)
lastPrecommits := types.NewVoteSet(cs.config.GetString("chain_id"), state.LastBlockHeight, seenCommit.Round(), types.VoteTypePrecommit, state.LastValidators)
for _, precommit := range seenCommit.Precommits {
if precommit == nil {
continue
}
added, err := lastPrecommits.AddVote(precommit)
if !added || err != nil {
PanicCrisis(Fmt("Failed to reconstruct LastCommit: %v", err))
}
}
if !lastPrecommits.HasTwoThirdsMajority() {
PanicSanity("Failed to reconstruct LastCommit: Does not have +2/3 maj")
}
cs.LastCommit = lastPrecommits
}
// Updates ConsensusState and increments height to match that of state.
// The round becomes 0 and cs.Step becomes RoundStepNewHeight.
func (cs *ConsensusState) updateToState(state *sm.State) {
if cs.CommitRound > -1 && 0 < cs.Height && cs.Height != state.LastBlockHeight {
PanicSanity(Fmt("updateToState() expected state height of %v but found %v",
cs.Height, state.LastBlockHeight))
}
if cs.state != nil && cs.state.LastBlockHeight+1 != cs.Height {
// This might happen when someone else is mutating cs.state.
// Someone forgot to pass in state.Copy() somewhere?!
PanicSanity(Fmt("Inconsistent cs.state.LastBlockHeight+1 %v vs cs.Height %v",
cs.state.LastBlockHeight+1, cs.Height))
}
// If state isn't further out than cs.state, just ignore.
// This happens when SwitchToConsensus() is called in the reactor.
// We don't want to reset e.g. the Votes.
if cs.state != nil && (state.LastBlockHeight <= cs.state.LastBlockHeight) {
log.Notice("Ignoring updateToState()", "newHeight", state.LastBlockHeight+1, "oldHeight", cs.state.LastBlockHeight+1)
return
}
// Reset fields based on state.
validators := state.Validators
height := state.LastBlockHeight + 1 // Next desired block height
lastPrecommits := (*types.VoteSet)(nil)
if cs.CommitRound > -1 && cs.Votes != nil {
if !cs.Votes.Precommits(cs.CommitRound).HasTwoThirdsMajority() {
PanicSanity("updateToState(state) called but last Precommit round didn't have +2/3")
}
lastPrecommits = cs.Votes.Precommits(cs.CommitRound)
}
// RoundState fields
cs.updateHeight(height)
cs.updateRoundStep(0, RoundStepNewHeight)
if cs.CommitTime.IsZero() {
// "Now" makes it easier to sync up dev nodes.
// We add timeoutCommit to allow transactions
// to be gathered for the first block.
// And alternative solution that relies on clocks:
// cs.StartTime = state.LastBlockTime.Add(timeoutCommit)
cs.StartTime = cs.timeoutParams.Commit(time.Now())
} else {
cs.StartTime = cs.timeoutParams.Commit(cs.CommitTime)
}
cs.CommitTime = time.Time{}
cs.Validators = validators
cs.Proposal = nil
cs.ProposalBlock = nil
cs.ProposalBlockParts = nil
cs.LockedRound = 0
cs.LockedBlock = nil
cs.LockedBlockParts = nil
cs.Votes = NewHeightVoteSet(cs.config.GetString("chain_id"), height, validators)
cs.CommitRound = -1
cs.LastCommit = lastPrecommits
cs.LastValidators = state.LastValidators
cs.state = state
// Finally, broadcast RoundState
cs.newStep()
}
func (cs *ConsensusState) newStep() {
rs := cs.RoundStateEvent()
cs.wal.Save(rs)
cs.nSteps += 1
// newStep is called by updateToStep in NewConsensusState before the evsw is set!
if cs.evsw != nil {
types.FireEventNewRoundStep(cs.evsw, rs)
}
}
//-----------------------------------------
// the main go routines
// the state machine sends on tickChan to start a new timer.
// timers are interupted and replaced by new ticks from later steps
// timeouts of 0 on the tickChan will be immediately relayed to the tockChan
func (cs *ConsensusState) timeoutRoutine() {
log.Debug("Starting timeout routine")
var ti timeoutInfo
for {
select {
case newti := <-cs.tickChan:
log.Debug("Received tick", "old_ti", ti, "new_ti", newti)
// ignore tickers for old height/round/step
if newti.Height < ti.Height {
continue
} else if newti.Height == ti.Height {
if newti.Round < ti.Round {
continue
} else if newti.Round == ti.Round {
if ti.Step > 0 && newti.Step <= ti.Step {
continue
}
}
}
ti = newti
// if the newti has duration == 0, we relay to the tockChan immediately (no timeout)
if ti.Duration == time.Duration(0) {
go func(t timeoutInfo) { cs.tockChan <- t }(ti)
continue
}
log.Debug("Scheduling timeout", "dur", ti.Duration, "height", ti.Height, "round", ti.Round, "step", ti.Step)
cs.timeoutTicker.Stop()
cs.timeoutTicker = time.NewTicker(ti.Duration)
case <-cs.timeoutTicker.C:
log.Info("Timed out", "dur", ti.Duration, "height", ti.Height, "round", ti.Round, "step", ti.Step)
cs.timeoutTicker.Stop()
// go routine here gaurantees timeoutRoutine doesn't block.
// Determinism comes from playback in the receiveRoutine.
// We can eliminate it by merging the timeoutRoutine into receiveRoutine
// and managing the timeouts ourselves with a millisecond ticker
go func(t timeoutInfo) { cs.tockChan <- t }(ti)
case <-cs.Quit:
return
}
}
}
// a nice idea but probably more trouble than its worth
func (cs *ConsensusState) stopTimer() {
cs.timeoutTicker.Stop()
}
// receiveRoutine handles messages which may cause state transitions.
// it's argument (n) is the number of messages to process before exiting - use 0 to run forever
// It keeps the RoundState and is the only thing that updates it.
// Updates (state transitions) happen on timeouts, complete proposals, and 2/3 majorities
func (cs *ConsensusState) receiveRoutine(maxSteps int) {
for {
if maxSteps > 0 {
if cs.nSteps >= maxSteps {
log.Warn("reached max steps. exiting receive routine")
cs.nSteps = 0
return
}
}
rs := cs.RoundState
var mi msgInfo
select {
case mi = <-cs.peerMsgQueue:
cs.wal.Save(mi)
// handles proposals, block parts, votes
// may generate internal events (votes, complete proposals, 2/3 majorities)
cs.handleMsg(mi, rs)
case mi = <-cs.internalMsgQueue:
cs.wal.Save(mi)
// handles proposals, block parts, votes
cs.handleMsg(mi, rs)
case ti := <-cs.tockChan:
cs.wal.Save(ti)
// if the timeout is relevant to the rs
// go to the next step
cs.handleTimeout(ti, rs)
case <-cs.Quit:
// drain the internalMsgQueue in case we eg. signed a proposal but it didn't hit the wal
FLUSH:
for {
select {
case mi = <-cs.internalMsgQueue:
cs.wal.Save(mi)
cs.handleMsg(mi, rs)
default:
break FLUSH
}
}
// close wal now that we're done writing to it
if cs.wal != nil {
cs.wal.Stop()
}
return
}
}
}
// state transitions on complete-proposal, 2/3-any, 2/3-one
func (cs *ConsensusState) handleMsg(mi msgInfo, rs RoundState) {
cs.mtx.Lock()
defer cs.mtx.Unlock()
var err error
msg, peerKey := mi.Msg, mi.PeerKey
switch msg := msg.(type) {
case *ProposalMessage:
// will not cause transition.
// once proposal is set, we can receive block parts
err = cs.setProposal(msg.Proposal)
case *BlockPartMessage:
// if the proposal is complete, we'll enterPrevote or tryFinalizeCommit
_, err = cs.addProposalBlockPart(msg.Height, msg.Part, peerKey != "")
if err != nil && msg.Round != cs.Round {
err = nil
}
case *VoteMessage:
// attempt to add the vote and dupeout the validator if its a duplicate signature
// if the vote gives us a 2/3-any or 2/3-one, we transition
err := cs.tryAddVote(msg.Vote, peerKey)
if err == ErrAddingVote {
// TODO: punish peer
}
// NOTE: the vote is broadcast to peers by the reactor listening
// for vote events
// TODO: If rs.Height == vote.Height && rs.Round < vote.Round,
// the peer is sending us CatchupCommit precommits.
// We could make note of this and help filter in broadcastHasVoteMessage().
default:
log.Warn("Unknown msg type", reflect.TypeOf(msg))
}
if err != nil {
log.Error("Error with msg", "type", reflect.TypeOf(msg), "peer", peerKey, "error", err, "msg", msg)
}
}
func (cs *ConsensusState) handleTimeout(ti timeoutInfo, rs RoundState) {
log.Debug("Received tock", "timeout", ti.Duration, "height", ti.Height, "round", ti.Round, "step", ti.Step)
// timeouts must be for current height, round, step
if ti.Height != rs.Height || ti.Round < rs.Round || (ti.Round == rs.Round && ti.Step < rs.Step) {
log.Debug("Ignoring tock because we're ahead", "height", rs.Height, "round", rs.Round, "step", rs.Step)
return
}
// the timeout will now cause a state transition
cs.mtx.Lock()
defer cs.mtx.Unlock()
switch ti.Step {
case RoundStepNewHeight:
// NewRound event fired from enterNewRound.
// XXX: should we fire timeout here?
cs.enterNewRound(ti.Height, 0)
case RoundStepPropose:
types.FireEventTimeoutPropose(cs.evsw, cs.RoundStateEvent())
cs.enterPrevote(ti.Height, ti.Round)
case RoundStepPrevoteWait:
types.FireEventTimeoutWait(cs.evsw, cs.RoundStateEvent())
cs.enterPrecommit(ti.Height, ti.Round)
case RoundStepPrecommitWait:
types.FireEventTimeoutWait(cs.evsw, cs.RoundStateEvent())
cs.enterNewRound(ti.Height, ti.Round+1)
default:
panic(Fmt("Invalid timeout step: %v", ti.Step))
}
}
//-----------------------------------------------------------------------------
// State functions
// Used internally by handleTimeout and handleMsg to make state transitions
// Enter: +2/3 precommits for nil at (height,round-1)
// Enter: `timeoutPrecommits` after any +2/3 precommits from (height,round-1)
// Enter: `startTime = commitTime+timeoutCommit` from NewHeight(height)
// NOTE: cs.StartTime was already set for height.
func (cs *ConsensusState) enterNewRound(height int, round int) {
if cs.Height != height || round < cs.Round || (cs.Round == round && cs.Step != RoundStepNewHeight) {
log.Debug(Fmt("enterNewRound(%v/%v): Invalid args. Current step: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
return
}
if now := time.Now(); cs.StartTime.After(now) {
log.Warn("Need to set a buffer and log.Warn() here for sanity.", "startTime", cs.StartTime, "now", now)
}
// cs.stopTimer()
log.Notice(Fmt("enterNewRound(%v/%v). Current: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
// Increment validators if necessary
validators := cs.Validators
if cs.Round < round {
validators = validators.Copy()
validators.IncrementAccum(round - cs.Round)
}
// Setup new round
// we don't fire newStep for this step,
// but we fire an event, so update the round step first
cs.updateRoundStep(round, RoundStepNewRound)
cs.Validators = validators
if round == 0 {
// We've already reset these upon new height,
// and meanwhile we might have received a proposal
// for round 0.
} else {
cs.Proposal = nil
cs.ProposalBlock = nil
cs.ProposalBlockParts = nil
}
cs.Votes.SetRound(round + 1) // also track next round (round+1) to allow round-skipping
types.FireEventNewRound(cs.evsw, cs.RoundStateEvent())
// Immediately go to enterPropose.
cs.enterPropose(height, round)
}
// Enter: from NewRound(height,round).
func (cs *ConsensusState) enterPropose(height int, round int) {
if cs.Height != height || round < cs.Round || (cs.Round == round && RoundStepPropose <= cs.Step) {
log.Debug(Fmt("enterPropose(%v/%v): Invalid args. Current step: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
return
}
log.Info(Fmt("enterPropose(%v/%v). Current: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
defer func() {
// Done enterPropose:
cs.updateRoundStep(round, RoundStepPropose)
cs.newStep()
// If we have the whole proposal + POL, then goto Prevote now.
// else, we'll enterPrevote when the rest of the proposal is received (in AddProposalBlockPart),
// or else after timeoutPropose
if cs.isProposalComplete() {
cs.enterPrevote(height, cs.Round)
}
}()
// If we don't get the proposal and all block parts quick enough, enterPrevote
cs.scheduleTimeout(cs.timeoutParams.Propose(round), height, round, RoundStepPropose)
// Nothing more to do if we're not a validator
if cs.privValidator == nil {
return
}
if !bytes.Equal(cs.Validators.Proposer().Address, cs.privValidator.GetAddress()) {
log.Info("enterPropose: Not our turn to propose", "proposer", cs.Validators.Proposer().Address, "privValidator", cs.privValidator)
} else {
log.Info("enterPropose: Our turn to propose", "proposer", cs.Validators.Proposer().Address, "privValidator", cs.privValidator)
cs.decideProposal(height, round)
}
}
func (cs *ConsensusState) defaultDecideProposal(height, round int) {
var block *types.Block
var blockParts *types.PartSet
// Decide on block
if cs.LockedBlock != nil {
// If we're locked onto a block, just choose that.
block, blockParts = cs.LockedBlock, cs.LockedBlockParts
} else {
// Create a new proposal block from state/txs from the mempool.
block, blockParts = cs.createProposalBlock()
if block == nil { // on error
return
}
}
// Make proposal
polRound, polBlockID := cs.Votes.POLInfo()
proposal := types.NewProposal(height, round, blockParts.Header(), polRound, polBlockID)
err := cs.privValidator.SignProposal(cs.state.ChainID, proposal)
if err == nil {
// Set fields
/* fields set by setProposal and addBlockPart
cs.Proposal = proposal
cs.ProposalBlock = block
cs.ProposalBlockParts = blockParts
*/
// send proposal and block parts on internal msg queue
cs.sendInternalMessage(msgInfo{&ProposalMessage{proposal}, ""})
for i := 0; i < blockParts.Total(); i++ {
part := blockParts.GetPart(i)
cs.sendInternalMessage(msgInfo{&BlockPartMessage{cs.Height, cs.Round, part}, ""})
}
log.Info("Signed proposal", "height", height, "round", round, "proposal", proposal)
log.Debug(Fmt("Signed proposal block: %v", block))
} else {
if !cs.replayMode {
log.Warn("enterPropose: Error signing proposal", "height", height, "round", round, "error", err)
}
}
}
// Returns true if the proposal block is complete &&
// (if POLRound was proposed, we have +2/3 prevotes from there).
func (cs *ConsensusState) isProposalComplete() bool {
if cs.Proposal == nil || cs.ProposalBlock == nil {
return false
}
// we have the proposal. if there's a POLRound,
// make sure we have the prevotes from it too
if cs.Proposal.POLRound < 0 {
return true
} else {
// if this is false the proposer is lying or we haven't received the POL yet
return cs.Votes.Prevotes(cs.Proposal.POLRound).HasTwoThirdsMajority()
}
}
// Create the next block to propose and return it.
// Returns nil block upon error.
// NOTE: keep it side-effect free for clarity.
func (cs *ConsensusState) createProposalBlock() (block *types.Block, blockParts *types.PartSet) {
var commit *types.Commit
if cs.Height == 1 {
// We're creating a proposal for the first block.
// The commit is empty, but not nil.
commit = &types.Commit{}
} else if cs.LastCommit.HasTwoThirdsMajority() {
// Make the commit from LastCommit
commit = cs.LastCommit.MakeCommit()
} else {
// This shouldn't happen.
log.Error("enterPropose: Cannot propose anything: No commit for the previous block.")
return
}
// Mempool validated transactions
txs := cs.mempool.Reap(cs.config.GetInt("block_size"))
block = &types.Block{
Header: &types.Header{
ChainID: cs.state.ChainID,
Height: cs.Height,
Time: time.Now(),
NumTxs: len(txs),
LastBlockID: cs.state.LastBlockID,
ValidatorsHash: cs.state.Validators.Hash(),
AppHash: cs.state.AppHash, // state merkle root of txs from the previous block.
},
LastCommit: commit,
Data: &types.Data{
Txs: txs,
},
}
block.FillHeader()
blockParts = block.MakePartSet(cs.config.GetInt("block_part_size"))
return block, blockParts
}
// Enter: `timeoutPropose` after entering Propose.
// Enter: proposal block and POL is ready.
// Enter: any +2/3 prevotes for future round.
// Prevote for LockedBlock if we're locked, or ProposalBlock if valid.
// Otherwise vote nil.
func (cs *ConsensusState) enterPrevote(height int, round int) {
if cs.Height != height || round < cs.Round || (cs.Round == round && RoundStepPrevote <= cs.Step) {
log.Debug(Fmt("enterPrevote(%v/%v): Invalid args. Current step: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
return
}
defer func() {
// Done enterPrevote:
cs.updateRoundStep(round, RoundStepPrevote)
cs.newStep()
}()
// fire event for how we got here
if cs.isProposalComplete() {
types.FireEventCompleteProposal(cs.evsw, cs.RoundStateEvent())
} else {
// we received +2/3 prevotes for a future round
// TODO: catchup event?
}
// cs.stopTimer()
log.Info(Fmt("enterPrevote(%v/%v). Current: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
// Sign and broadcast vote as necessary
cs.doPrevote(height, round)
// Once `addVote` hits any +2/3 prevotes, we will go to PrevoteWait
// (so we have more time to try and collect +2/3 prevotes for a single block)
}
func (cs *ConsensusState) defaultDoPrevote(height int, round int) {
// If a block is locked, prevote that.
if cs.LockedBlock != nil {
log.Notice("enterPrevote: Block was locked")
cs.signAddVote(types.VoteTypePrevote, cs.LockedBlock.Hash(), cs.LockedBlockParts.Header())
return
}
// If ProposalBlock is nil, prevote nil.
if cs.ProposalBlock == nil {
log.Warn("enterPrevote: ProposalBlock is nil")
cs.signAddVote(types.VoteTypePrevote, nil, types.PartSetHeader{})
return
}
// Valdiate proposal block
err := cs.state.ValidateBlock(cs.ProposalBlock)
if err != nil {
// ProposalBlock is invalid, prevote nil.
log.Warn("enterPrevote: ProposalBlock is invalid", "error", err)
cs.signAddVote(types.VoteTypePrevote, nil, types.PartSetHeader{})
return
}
// Prevote cs.ProposalBlock
// NOTE: the proposal signature is validated when it is received,
// and the proposal block parts are validated as they are received (against the merkle hash in the proposal)
cs.signAddVote(types.VoteTypePrevote, cs.ProposalBlock.Hash(), cs.ProposalBlockParts.Header())
return
}
// Enter: any +2/3 prevotes at next round.
func (cs *ConsensusState) enterPrevoteWait(height int, round int) {
if cs.Height != height || round < cs.Round || (cs.Round == round && RoundStepPrevoteWait <= cs.Step) {
log.Debug(Fmt("enterPrevoteWait(%v/%v): Invalid args. Current step: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
return
}
if !cs.Votes.Prevotes(round).HasTwoThirdsAny() {
PanicSanity(Fmt("enterPrevoteWait(%v/%v), but Prevotes does not have any +2/3 votes", height, round))
}
log.Info(Fmt("enterPrevoteWait(%v/%v). Current: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
defer func() {
// Done enterPrevoteWait:
cs.updateRoundStep(round, RoundStepPrevoteWait)
cs.newStep()
}()
// Wait for some more prevotes; enterPrecommit
cs.scheduleTimeout(cs.timeoutParams.Prevote(round), height, round, RoundStepPrevoteWait)
}
// Enter: +2/3 precomits for block or nil.
// Enter: `timeoutPrevote` after any +2/3 prevotes.
// Enter: any +2/3 precommits for next round.
// Lock & precommit the ProposalBlock if we have enough prevotes for it (a POL in this round)
// else, unlock an existing lock and precommit nil if +2/3 of prevotes were nil,
// else, precommit nil otherwise.
func (cs *ConsensusState) enterPrecommit(height int, round int) {
if cs.Height != height || round < cs.Round || (cs.Round == round && RoundStepPrecommit <= cs.Step) {
log.Debug(Fmt("enterPrecommit(%v/%v): Invalid args. Current step: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
return
}
// cs.stopTimer()
log.Info(Fmt("enterPrecommit(%v/%v). Current: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
defer func() {
// Done enterPrecommit:
cs.updateRoundStep(round, RoundStepPrecommit)
cs.newStep()
}()
blockID, ok := cs.Votes.Prevotes(round).TwoThirdsMajority()
// If we don't have a polka, we must precommit nil
if !ok {
if cs.LockedBlock != nil {
log.Notice("enterPrecommit: No +2/3 prevotes during enterPrecommit while we're locked. Precommitting nil")
} else {
log.Notice("enterPrecommit: No +2/3 prevotes during enterPrecommit. Precommitting nil.")
}
cs.signAddVote(types.VoteTypePrecommit, nil, types.PartSetHeader{})
return
}
// At this point +2/3 prevoted for a particular block or nil
types.FireEventPolka(cs.evsw, cs.RoundStateEvent())
// the latest POLRound should be this round
polRound, _ := cs.Votes.POLInfo()
if polRound < round {
PanicSanity(Fmt("This POLRound should be %v but got %", round, polRound))
}
// +2/3 prevoted nil. Unlock and precommit nil.
if len(blockID.Hash) == 0 {
if cs.LockedBlock == nil {
log.Notice("enterPrecommit: +2/3 prevoted for nil.")
} else {
log.Notice("enterPrecommit: +2/3 prevoted for nil. Unlocking")
cs.LockedRound = 0
cs.LockedBlock = nil
cs.LockedBlockParts = nil
types.FireEventUnlock(cs.evsw, cs.RoundStateEvent())
}
cs.signAddVote(types.VoteTypePrecommit, nil, types.PartSetHeader{})
return
}
// At this point, +2/3 prevoted for a particular block.
// If we're already locked on that block, precommit it, and update the LockedRound
if cs.LockedBlock.HashesTo(blockID.Hash) {
log.Notice("enterPrecommit: +2/3 prevoted locked block. Relocking")
cs.LockedRound = round
types.FireEventRelock(cs.evsw, cs.RoundStateEvent())
cs.signAddVote(types.VoteTypePrecommit, blockID.Hash, blockID.PartsHeader)
return
}
// If +2/3 prevoted for proposal block, stage and precommit it
if cs.ProposalBlock.HashesTo(blockID.Hash) {
log.Notice("enterPrecommit: +2/3 prevoted proposal block. Locking", "hash", blockID.Hash)
// Validate the block.
if err := cs.state.ValidateBlock(cs.ProposalBlock); err != nil {
PanicConsensus(Fmt("enterPrecommit: +2/3 prevoted for an invalid block: %v", err))
}
cs.LockedRound = round
cs.LockedBlock = cs.ProposalBlock
cs.LockedBlockParts = cs.ProposalBlockParts
types.FireEventLock(cs.evsw, cs.RoundStateEvent())
cs.signAddVote(types.VoteTypePrecommit, blockID.Hash, blockID.PartsHeader)
return
}
// There was a polka in this round for a block we don't have.
// Fetch that block, unlock, and precommit nil.
// The +2/3 prevotes for this round is the POL for our unlock.
// TODO: In the future save the POL prevotes for justification.
cs.LockedRound = 0
cs.LockedBlock = nil
cs.LockedBlockParts = nil
if !cs.ProposalBlockParts.HasHeader(blockID.PartsHeader) {
cs.ProposalBlock = nil
cs.ProposalBlockParts = types.NewPartSetFromHeader(blockID.PartsHeader)
}
types.FireEventUnlock(cs.evsw, cs.RoundStateEvent())
cs.signAddVote(types.VoteTypePrecommit, nil, types.PartSetHeader{})
return
}
// Enter: any +2/3 precommits for next round.
func (cs *ConsensusState) enterPrecommitWait(height int, round int) {
if cs.Height != height || round < cs.Round || (cs.Round == round && RoundStepPrecommitWait <= cs.Step) {
log.Debug(Fmt("enterPrecommitWait(%v/%v): Invalid args. Current step: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
return
}
if !cs.Votes.Precommits(round).HasTwoThirdsAny() {
PanicSanity(Fmt("enterPrecommitWait(%v/%v), but Precommits does not have any +2/3 votes", height, round))
}
log.Info(Fmt("enterPrecommitWait(%v/%v). Current: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
defer func() {
// Done enterPrecommitWait:
cs.updateRoundStep(round, RoundStepPrecommitWait)
cs.newStep()
}()
// Wait for some more precommits; enterNewRound
cs.scheduleTimeout(cs.timeoutParams.Precommit(round), height, round, RoundStepPrecommitWait)
}
// Enter: +2/3 precommits for block
func (cs *ConsensusState) enterCommit(height int, commitRound int) {
if cs.Height != height || RoundStepCommit <= cs.Step {
log.Debug(Fmt("enterCommit(%v/%v): Invalid args. Current step: %v/%v/%v", height, commitRound, cs.Height, cs.Round, cs.Step))
return
}
log.Info(Fmt("enterCommit(%v/%v). Current: %v/%v/%v", height, commitRound, cs.Height, cs.Round, cs.Step))
defer func() {
// Done enterCommit:
// keep cs.Round the same, commitRound points to the right Precommits set.
cs.updateRoundStep(cs.Round, RoundStepCommit)
cs.CommitRound = commitRound
cs.newStep()
// Maybe finalize immediately.
cs.tryFinalizeCommit(height)
}()
blockID, ok := cs.Votes.Precommits(commitRound).TwoThirdsMajority()
if !ok {
PanicSanity("RunActionCommit() expects +2/3 precommits")
}
// The Locked* fields no longer matter.
// Move them over to ProposalBlock if they match the commit hash,
// otherwise they'll be cleared in updateToState.
if cs.LockedBlock.HashesTo(blockID.Hash) {
cs.ProposalBlock = cs.LockedBlock
cs.ProposalBlockParts = cs.LockedBlockParts
}
// If we don't have the block being committed, set up to get it.
if !cs.ProposalBlock.HashesTo(blockID.Hash) {
if !cs.ProposalBlockParts.HasHeader(blockID.PartsHeader) {
// We're getting the wrong block.
// Set up ProposalBlockParts and keep waiting.
cs.ProposalBlock = nil
cs.ProposalBlockParts = types.NewPartSetFromHeader(blockID.PartsHeader)
} else {
// We just need to keep waiting.
}
}
}
// If we have the block AND +2/3 commits for it, finalize.
func (cs *ConsensusState) tryFinalizeCommit(height int) {
if cs.Height != height {
PanicSanity(Fmt("tryFinalizeCommit() cs.Height: %v vs height: %v", cs.Height, height))
}
blockID, ok := cs.Votes.Precommits(cs.CommitRound).TwoThirdsMajority()
if !ok || len(blockID.Hash) == 0 {
log.Warn("Attempt to finalize failed. There was no +2/3 majority, or +2/3 was for <nil>.")
return
}
if !cs.ProposalBlock.HashesTo(blockID.Hash) {
// TODO: this happens every time if we're not a validator (ugly logs)
// TODO: ^^ wait, why does it matter that we're a validator?
log.Warn("Attempt to finalize failed. We don't have the commit block.")
return
}
// go
cs.finalizeCommit(height)
}
// Increment height and goto RoundStepNewHeight
func (cs *ConsensusState) finalizeCommit(height int) {
if cs.Height != height || cs.Step != RoundStepCommit {
log.Debug(Fmt("finalizeCommit(%v): Invalid args. Current step: %v/%v/%v", height, cs.Height, cs.Round, cs.Step))
return
}
blockID, ok := cs.Votes.Precommits(cs.CommitRound).TwoThirdsMajority()
block, blockParts := cs.ProposalBlock, cs.ProposalBlockParts
if !ok {
PanicSanity(Fmt("Cannot finalizeCommit, commit does not have two thirds majority"))
}
if !blockParts.HasHeader(blockID.PartsHeader) {
PanicSanity(Fmt("Expected ProposalBlockParts header to be commit header"))
}
if !block.HashesTo(blockID.Hash) {
PanicSanity(Fmt("Cannot finalizeCommit, ProposalBlock does not hash to commit hash"))
}
if err := cs.state.ValidateBlock(block); err != nil {
PanicConsensus(Fmt("+2/3 committed an invalid block: %v", err))
}
log.Notice(Fmt("Finalizing commit of block with %d txs", block.NumTxs),
"height", block.Height, "hash", block.Hash(), "root", block.AppHash)
log.Info(Fmt("%v", block))
// Fire off event for new block.
// TODO: Handle app failure. See #177
types.FireEventNewBlock(cs.evsw, types.EventDataNewBlock{block})
types.FireEventNewBlockHeader(cs.evsw, types.EventDataNewBlockHeader{block.Header})
// Create a copy of the state for staging
stateCopy := cs.state.Copy()
// event cache for txs
eventCache := types.NewEventCache(cs.evsw)
// Execute and commit the block
// NOTE: All calls to the proxyAppConn should come here
stateCopy.ApplyBlock(eventCache, cs.proxyAppConn, block, blockParts.Header(), cs.mempool)
// txs committed, bad ones removed from mepool; fire events
// NOTE: the block.AppHash wont reflect these txs until the next block
eventCache.Flush()
// Save to blockStore.
if cs.blockStore.Height() < block.Height {
precommits := cs.Votes.Precommits(cs.CommitRound)
seenCommit := precommits.MakeCommit()
cs.blockStore.SaveBlock(block, blockParts, seenCommit)
}
// Save the state.
stateCopy.Save()
// NewHeightStep!
cs.updateToState(stateCopy)
// cs.StartTime is already set.
// Schedule Round0 to start soon.
cs.scheduleRound0(&cs.RoundState)
// By here,
// * cs.Height has been increment to height+1
// * cs.Step is now RoundStepNewHeight
// * cs.StartTime is set to when we will start round0.
return
}
//-----------------------------------------------------------------------------
func (cs *ConsensusState) defaultSetProposal(proposal *types.Proposal) error {
// Already have one
// TODO: possibly catch double proposals
if cs.Proposal != nil {
return nil
}
// Does not apply
if proposal.Height != cs.Height || proposal.Round != cs.Round {
return nil
}
// We don't care about the proposal if we're already in RoundStepCommit.
if RoundStepCommit <= cs.Step {
return nil
}
// Verify POLRound, which must be -1 or between 0 and proposal.Round exclusive.
if proposal.POLRound != -1 &&
(proposal.POLRound < 0 || proposal.Round <= proposal.POLRound) {
return ErrInvalidProposalPOLRound
}
// Verify signature
if !cs.Validators.Proposer().PubKey.VerifyBytes(types.SignBytes(cs.state.ChainID, proposal), proposal.Signature) {
return ErrInvalidProposalSignature
}
cs.Proposal = proposal
cs.ProposalBlockParts = types.NewPartSetFromHeader(proposal.BlockPartsHeader)
return nil
}
// NOTE: block is not necessarily valid.
// Asynchronously triggers either enterPrevote (before we timeout of propose) or tryFinalizeCommit, once we have the full block.
func (cs *ConsensusState) addProposalBlockPart(height int, part *types.Part, verify bool) (added bool, err error) {
// Blocks might be reused, so round mismatch is OK
if cs.Height != height {
return false, nil
}
// We're not expecting a block part.
if cs.ProposalBlockParts == nil {
return false, nil // TODO: bad peer? Return error?
}
added, err = cs.ProposalBlockParts.AddPart(part, verify)
if err != nil {
return added, err
}
if added && cs.ProposalBlockParts.IsComplete() {
// Added and completed!
var n int
var err error
cs.ProposalBlock = wire.ReadBinary(&types.Block{}, cs.ProposalBlockParts.GetReader(), types.MaxBlockSize, &n, &err).(*types.Block)
// NOTE: it's possible to receive complete proposal blocks for future rounds without having the proposal
log.Info("Received complete proposal block", "height", cs.ProposalBlock.Height, "hash", cs.ProposalBlock.Hash())
if cs.Step == RoundStepPropose && cs.isProposalComplete() {
// Move onto the next step
cs.enterPrevote(height, cs.Round)
} else if cs.Step == RoundStepCommit {
// If we're waiting on the proposal block...
cs.tryFinalizeCommit(height)
}
return true, err
}
return added, nil
}
// Attempt to add the vote. if its a duplicate signature, dupeout the validator
func (cs *ConsensusState) tryAddVote(vote *types.Vote, peerKey string) error {
_, err := cs.addVote(vote, peerKey)
if err != nil {
// If the vote height is off, we'll just ignore it,
// But if it's a conflicting sig, broadcast evidence tx for slashing.
// If it's otherwise invalid, punish peer.
if err == ErrVoteHeightMismatch {
return err
} else if _, ok := err.(*types.ErrVoteConflictingVotes); ok {
if peerKey == "" {
log.Warn("Found conflicting vote from ourselves. Did you unsafe_reset a validator?", "height", vote.Height, "round", vote.Round, "type", vote.Type)
return err
}
log.Warn("Found conflicting vote. Publish evidence (TODO)")
/* TODO
evidenceTx := &types.DupeoutTx{
Address: address,
VoteA: *errDupe.VoteA,
VoteB: *errDupe.VoteB,
}
cs.mempool.BroadcastTx(struct{???}{evidenceTx}) // shouldn't need to check returned err
*/
return err
} else {
// Probably an invalid signature. Bad peer.
log.Warn("Error attempting to add vote", "error", err)
return ErrAddingVote
}
}
return nil
}
//-----------------------------------------------------------------------------
func (cs *ConsensusState) addVote(vote *types.Vote, peerKey string) (added bool, err error) {
log.Debug("addVote", "voteHeight", vote.Height, "voteType", vote.Type, "csHeight", cs.Height)
// A precommit for the previous height?
if vote.Height+1 == cs.Height {
if !(cs.Step == RoundStepNewHeight && vote.Type == types.VoteTypePrecommit) {
// TODO: give the reason ..
// fmt.Errorf("tryAddVote: Wrong height, not a LastCommit straggler commit.")
return added, ErrVoteHeightMismatch
}
added, err = cs.LastCommit.AddVote(vote)
if added {
log.Info(Fmt("Added to lastPrecommits: %v", cs.LastCommit.StringShort()))
types.FireEventVote(cs.evsw, types.EventDataVote{vote})
}
return
}
// A prevote/precommit for this height?
if vote.Height == cs.Height {
height := cs.Height
added, err = cs.Votes.AddVote(vote, peerKey)
if added {
types.FireEventVote(cs.evsw, types.EventDataVote{vote})
switch vote.Type {
case types.VoteTypePrevote:
prevotes := cs.Votes.Prevotes(vote.Round)
log.Info("Added to prevote", "vote", vote, "prevotes", prevotes.StringShort())
// First, unlock if prevotes is a valid POL.
// >> lockRound < POLRound <= unlockOrChangeLockRound (see spec)
// NOTE: If (lockRound < POLRound) but !(POLRound <= unlockOrChangeLockRound),
// we'll still enterNewRound(H,vote.R) and enterPrecommit(H,vote.R) to process it
// there.
if (cs.LockedBlock != nil) && (cs.LockedRound < vote.Round) && (vote.Round <= cs.Round) {
blockID, ok := prevotes.TwoThirdsMajority()
if ok && !cs.LockedBlock.HashesTo(blockID.Hash) {
log.Notice("Unlocking because of POL.", "lockedRound", cs.LockedRound, "POLRound", vote.Round)
cs.LockedRound = 0
cs.LockedBlock = nil
cs.LockedBlockParts = nil
types.FireEventUnlock(cs.evsw, cs.RoundStateEvent())
}
}
if cs.Round <= vote.Round && prevotes.HasTwoThirdsAny() {
// Round-skip over to PrevoteWait or goto Precommit.
cs.enterNewRound(height, vote.Round) // if the vote is ahead of us
if prevotes.HasTwoThirdsMajority() {
cs.enterPrecommit(height, vote.Round)
} else {
cs.enterPrevote(height, vote.Round) // if the vote is ahead of us
cs.enterPrevoteWait(height, vote.Round)
}
} else if cs.Proposal != nil && 0 <= cs.Proposal.POLRound && cs.Proposal.POLRound == vote.Round {
// If the proposal is now complete, enter prevote of cs.Round.
if cs.isProposalComplete() {
cs.enterPrevote(height, cs.Round)
}
}
case types.VoteTypePrecommit:
precommits := cs.Votes.Precommits(vote.Round)
log.Info("Added to precommit", "vote", vote, "precommits", precommits.StringShort())
blockID, ok := precommits.TwoThirdsMajority()
if ok {
if len(blockID.Hash) == 0 {
cs.enterNewRound(height, vote.Round+1)
} else {
cs.enterNewRound(height, vote.Round)
cs.enterPrecommit(height, vote.Round)
cs.enterCommit(height, vote.Round)
}
} else if cs.Round <= vote.Round && precommits.HasTwoThirdsAny() {
cs.enterNewRound(height, vote.Round)
cs.enterPrecommit(height, vote.Round)
cs.enterPrecommitWait(height, vote.Round)
//}()
}
default:
PanicSanity(Fmt("Unexpected vote type %X", vote.Type)) // Should not happen.
}
}
// Either duplicate, or error upon cs.Votes.AddByIndex()
return
} else {
err = ErrVoteHeightMismatch
}
// Height mismatch, bad peer?
log.Info("Vote ignored and not added", "voteHeight", vote.Height, "csHeight", cs.Height, "err", err)
return
}
func (cs *ConsensusState) signVote(type_ byte, hash []byte, header types.PartSetHeader) (*types.Vote, error) {
// TODO: store our index in the cs so we don't have to do this every time
addr := cs.privValidator.GetAddress()
valIndex, _ := cs.Validators.GetByAddress(addr)
vote := &types.Vote{
ValidatorAddress: addr,
ValidatorIndex: valIndex,
Height: cs.Height,
Round: cs.Round,
Type: type_,
BlockID: types.BlockID{hash, header},
}
err := cs.privValidator.SignVote(cs.state.ChainID, vote)
return vote, err
}
// sign the vote and publish on internalMsgQueue
func (cs *ConsensusState) signAddVote(type_ byte, hash []byte, header types.PartSetHeader) *types.Vote {
if cs.privValidator == nil || !cs.Validators.HasAddress(cs.privValidator.GetAddress()) {
return nil
}
vote, err := cs.signVote(type_, hash, header)
if err == nil {
cs.sendInternalMessage(msgInfo{&VoteMessage{vote}, ""})
log.Info("Signed and pushed vote", "height", cs.Height, "round", cs.Round, "vote", vote, "error", err)
return vote
} else {
//if !cs.replayMode {
log.Warn("Error signing vote", "height", cs.Height, "round", cs.Round, "vote", vote, "error", err)
//}
return nil
}
}
//---------------------------------------------------------
func CompareHRS(h1, r1 int, s1 RoundStepType, h2, r2 int, s2 RoundStepType) int {
if h1 < h2 {
return -1
} else if h1 > h2 {
return 1
}
if r1 < r2 {
return -1
} else if r1 > r2 {
return 1
}
if s1 < s2 {
return -1
} else if s1 > s2 {
return 1
}
return 0
}