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state.go
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state.go
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package consensus
import (
"bytes"
"errors"
"fmt"
"reflect"
"runtime/debug"
"sync"
"time"
fail "github.com/ebuchman/fail-test"
cmn "github.com/tendermint/tmlibs/common"
"github.com/tendermint/tmlibs/log"
cfg "github.com/tendermint/tendermint/config"
cstypes "github.com/tendermint/tendermint/consensus/types"
"github.com/tendermint/tendermint/p2p"
sm "github.com/tendermint/tendermint/state"
"github.com/tendermint/tendermint/types"
)
//-----------------------------------------------------------------------------
// Config
const (
proposalHeartbeatIntervalSeconds = 2
)
//-----------------------------------------------------------------------------
// 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")
)
//-----------------------------------------------------------------------------
var (
msgQueueSize = 1000
)
// msgs from the reactor which may update the state
type msgInfo struct {
Msg ConsensusMessage `json:"msg"`
PeerID p2p.ID `json:"peer_key"`
}
// internally generated messages which may update the state
type timeoutInfo struct {
Duration time.Duration `json:"duration"`
Height int64 `json:"height"`
Round int `json:"round"`
Step cstypes.RoundStepType `json:"step"`
}
func (ti *timeoutInfo) String() string {
return fmt.Sprintf("%v ; %d/%d %v", ti.Duration, ti.Height, ti.Round, ti.Step)
}
// ConsensusState handles execution of the consensus algorithm.
// It processes votes and proposals, and upon reaching agreement,
// commits blocks to the chain and executes them against the application.
// The internal state machine receives input from peers, the internal validator, and from a timer.
type ConsensusState struct {
cmn.BaseService
// config details
config *cfg.ConsensusConfig
privValidator types.PrivValidator // for signing votes
// services for creating and executing blocks
// TODO: encapsulate all of this in one "BlockManager"
blockExec *sm.BlockExecutor
blockStore types.BlockStore
mempool types.Mempool
evpool types.EvidencePool
// internal state
mtx sync.Mutex
cstypes.RoundState
state sm.State // State until height-1.
// state changes may be triggered by: msgs from peers,
// msgs from ourself, or by timeouts
peerMsgQueue chan msgInfo
internalMsgQueue chan msgInfo
timeoutTicker TimeoutTicker
// we use eventBus to trigger msg broadcasts in the reactor,
// and to notify external subscribers, eg. through a websocket
eventBus *types.EventBus
// a Write-Ahead Log ensures we can recover from any kind of crash
// and helps us avoid signing conflicting votes
wal WAL
replayMode bool // so we don't log signing errors during replay
doWALCatchup bool // determines if we even try to do the catchup
// for tests where we want to limit the number of transitions the state makes
nSteps int
// some functions can be overwritten for testing
decideProposal func(height int64, round int)
doPrevote func(height int64, round int)
setProposal func(proposal *types.Proposal) error
// closed when we finish shutting down
done chan struct{}
}
// NewConsensusState returns a new ConsensusState.
func NewConsensusState(config *cfg.ConsensusConfig, state sm.State, blockExec *sm.BlockExecutor, blockStore types.BlockStore, mempool types.Mempool, evpool types.EvidencePool) *ConsensusState {
cs := &ConsensusState{
config: config,
blockExec: blockExec,
blockStore: blockStore,
mempool: mempool,
peerMsgQueue: make(chan msgInfo, msgQueueSize),
internalMsgQueue: make(chan msgInfo, msgQueueSize),
timeoutTicker: NewTimeoutTicker(),
done: make(chan struct{}),
doWALCatchup: true,
wal: nilWAL{},
evpool: evpool,
}
// 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 = *cmn.NewBaseService(nil, "ConsensusState", cs)
return cs
}
//----------------------------------------
// Public interface
// SetLogger implements Service.
func (cs *ConsensusState) SetLogger(l log.Logger) {
cs.BaseService.Logger = l
cs.timeoutTicker.SetLogger(l)
}
// SetEventBus sets event bus.
func (cs *ConsensusState) SetEventBus(b *types.EventBus) {
cs.eventBus = b
cs.blockExec.SetEventBus(b)
}
// String returns a string.
func (cs *ConsensusState) String() string {
// better not to access shared variables
return cmn.Fmt("ConsensusState") //(H:%v R:%v S:%v", cs.Height, cs.Round, cs.Step)
}
// GetState returns a copy of the chain state.
func (cs *ConsensusState) GetState() sm.State {
cs.mtx.Lock()
defer cs.mtx.Unlock()
return cs.state.Copy()
}
// GetRoundState returns a shallow copy of the internal consensus state.
func (cs *ConsensusState) GetRoundState() *cstypes.RoundState {
cs.mtx.Lock()
defer cs.mtx.Unlock()
rs := cs.RoundState // copy
return &rs
}
// GetRoundStateJSON returns a json of RoundState, marshalled using go-amino.
func (cs *ConsensusState) GetRoundStateJSON() ([]byte, error) {
cs.mtx.Lock()
defer cs.mtx.Unlock()
return cdc.MarshalJSON(cs.RoundState)
}
// GetValidators returns a copy of the current validators.
func (cs *ConsensusState) GetValidators() (int64, []*types.Validator) {
cs.mtx.Lock()
defer cs.mtx.Unlock()
return cs.state.LastBlockHeight, cs.state.Validators.Copy().Validators
}
// SetPrivValidator sets the private validator account for signing votes.
func (cs *ConsensusState) SetPrivValidator(priv types.PrivValidator) {
cs.mtx.Lock()
defer cs.mtx.Unlock()
cs.privValidator = priv
}
// SetTimeoutTicker sets the local timer. It may be useful to overwrite for testing.
func (cs *ConsensusState) SetTimeoutTicker(timeoutTicker TimeoutTicker) {
cs.mtx.Lock()
defer cs.mtx.Unlock()
cs.timeoutTicker = timeoutTicker
}
// LoadCommit loads the commit for a given height.
func (cs *ConsensusState) LoadCommit(height int64) *types.Commit {
cs.mtx.Lock()
defer cs.mtx.Unlock()
if height == cs.blockStore.Height() {
return cs.blockStore.LoadSeenCommit(height)
}
return cs.blockStore.LoadBlockCommit(height)
}
// OnStart implements cmn.Service.
// It loads the latest state via the WAL, and starts the timeout and receive routines.
func (cs *ConsensusState) OnStart() error {
// we may set the WAL in testing before calling Start,
// so only OpenWAL if its still the nilWAL
if _, ok := cs.wal.(nilWAL); ok {
walFile := cs.config.WalFile()
wal, err := cs.OpenWAL(walFile)
if err != nil {
cs.Logger.Error("Error loading ConsensusState wal", "err", err.Error())
return err
}
cs.wal = wal
}
// 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)
err := cs.timeoutTicker.Start()
if err != nil {
return err
}
// we may have lost some votes if the process crashed
// reload from consensus log to catchup
if cs.doWALCatchup {
if err := cs.catchupReplay(cs.Height); err != nil {
cs.Logger.Error("Error on catchup replay. Proceeding to start ConsensusState anyway", "err", err.Error())
// NOTE: if we ever do return an error here,
// make sure to stop the timeoutTicker
}
}
// 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) {
err := cs.timeoutTicker.Start()
if err != nil {
cs.Logger.Error("Error starting timeout ticker", "err", err)
return
}
go cs.receiveRoutine(maxSteps)
}
// OnStop implements cmn.Service. It stops all routines and waits for the WAL to finish.
func (cs *ConsensusState) OnStop() {
cs.BaseService.OnStop()
cs.timeoutTicker.Stop()
// Make BaseService.Wait() wait until cs.wal.Wait()
if cs.IsRunning() {
cs.wal.Wait()
}
}
// Wait waits for the the main routine to return.
// NOTE: be sure to Stop() the event switch and drain
// any event channels or this may deadlock
func (cs *ConsensusState) Wait() {
<-cs.done
}
// OpenWAL opens a file to log all consensus messages and timeouts for deterministic accountability
func (cs *ConsensusState) OpenWAL(walFile string) (WAL, error) {
wal, err := NewWAL(walFile, cs.config.WalLight)
if err != nil {
cs.Logger.Error("Failed to open WAL for consensus state", "wal", walFile, "err", err)
return nil, err
}
wal.SetLogger(cs.Logger.With("wal", walFile))
if err := wal.Start(); err != nil {
return nil, err
}
return wal, nil
}
//------------------------------------------------------------
// Public interface for passing messages into the consensus state, possibly causing a state transition.
// If peerID == "", the msg is considered internal.
// Messages are added to the appropriate queue (peer or internal).
// If the queue is full, the function may block.
// TODO: should these return anything or let callers just use events?
// AddVote inputs a vote.
func (cs *ConsensusState) AddVote(vote *types.Vote, peerID p2p.ID) (added bool, err error) {
if peerID == "" {
cs.internalMsgQueue <- msgInfo{&VoteMessage{vote}, ""}
} else {
cs.peerMsgQueue <- msgInfo{&VoteMessage{vote}, peerID}
}
// TODO: wait for event?!
return false, nil
}
// SetProposal inputs a proposal.
func (cs *ConsensusState) SetProposal(proposal *types.Proposal, peerID p2p.ID) error {
if peerID == "" {
cs.internalMsgQueue <- msgInfo{&ProposalMessage{proposal}, ""}
} else {
cs.peerMsgQueue <- msgInfo{&ProposalMessage{proposal}, peerID}
}
// TODO: wait for event?!
return nil
}
// AddProposalBlockPart inputs a part of the proposal block.
func (cs *ConsensusState) AddProposalBlockPart(height int64, round int, part *types.Part, peerID p2p.ID) error {
if peerID == "" {
cs.internalMsgQueue <- msgInfo{&BlockPartMessage{height, round, part}, ""}
} else {
cs.peerMsgQueue <- msgInfo{&BlockPartMessage{height, round, part}, peerID}
}
// TODO: wait for event?!
return nil
}
// SetProposalAndBlock inputs the proposal and all block parts.
func (cs *ConsensusState) SetProposalAndBlock(proposal *types.Proposal, block *types.Block, parts *types.PartSet, peerID p2p.ID) error {
if err := cs.SetProposal(proposal, peerID); err != nil {
return err
}
for i := 0; i < parts.Total(); i++ {
part := parts.GetPart(i)
if err := cs.AddProposalBlockPart(proposal.Height, proposal.Round, part, peerID); err != nil {
return err
}
}
return nil
}
//------------------------------------------------------------
// internal functions for managing the state
func (cs *ConsensusState) updateHeight(height int64) {
cs.Height = height
}
func (cs *ConsensusState) updateRoundStep(round int, step cstypes.RoundStepType) {
cs.Round = round
cs.Step = step
}
// enterNewRound(height, 0) at cs.StartTime.
func (cs *ConsensusState) scheduleRound0(rs *cstypes.RoundState) {
//cs.Logger.Info("scheduleRound0", "now", time.Now(), "startTime", cs.StartTime)
sleepDuration := rs.StartTime.Sub(time.Now()) // nolint: gotype, gosimple
cs.scheduleTimeout(sleepDuration, rs.Height, 0, cstypes.RoundStepNewHeight)
}
// Attempt to schedule a timeout (by sending timeoutInfo on the tickChan)
func (cs *ConsensusState) scheduleTimeout(duration time.Duration, height int64, round int, step cstypes.RoundStepType) {
cs.timeoutTicker.ScheduleTimeout(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
cs.Logger.Info("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(state.ChainID, 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 {
cmn.PanicCrisis(cmn.Fmt("Failed to reconstruct LastCommit: %v", err))
}
}
if !lastPrecommits.HasTwoThirdsMajority() {
cmn.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 cstypes.RoundStepNewHeight.
func (cs *ConsensusState) updateToState(state sm.State) {
if cs.CommitRound > -1 && 0 < cs.Height && cs.Height != state.LastBlockHeight {
cmn.PanicSanity(cmn.Fmt("updateToState() expected state height of %v but found %v",
cs.Height, state.LastBlockHeight))
}
if !cs.state.IsEmpty() && cs.state.LastBlockHeight+1 != cs.Height {
// This might happen when someone else is mutating cs.state.
// Someone forgot to pass in state.Copy() somewhere?!
cmn.PanicSanity(cmn.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.IsEmpty() && (state.LastBlockHeight <= cs.state.LastBlockHeight) {
cs.Logger.Info("Ignoring updateToState()", "newHeight", state.LastBlockHeight+1, "oldHeight", cs.state.LastBlockHeight+1)
return
}
// Reset fields based on state.
validators := state.Validators
lastPrecommits := (*types.VoteSet)(nil)
if cs.CommitRound > -1 && cs.Votes != nil {
if !cs.Votes.Precommits(cs.CommitRound).HasTwoThirdsMajority() {
cmn.PanicSanity("updateToState(state) called but last Precommit round didn't have +2/3")
}
lastPrecommits = cs.Votes.Precommits(cs.CommitRound)
}
// Next desired block height
height := state.LastBlockHeight + 1
// RoundState fields
cs.updateHeight(height)
cs.updateRoundStep(0, cstypes.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.config.Commit(time.Now())
} else {
cs.StartTime = cs.config.Commit(cs.CommitTime)
}
cs.Validators = validators
cs.Proposal = nil
cs.ProposalBlock = nil
cs.ProposalBlockParts = nil
cs.LockedRound = 0
cs.LockedBlock = nil
cs.LockedBlockParts = nil
cs.ValidRound = 0
cs.ValidBlock = nil
cs.ValidBlockParts = nil
cs.Votes = cstypes.NewHeightVoteSet(state.ChainID, 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++
// newStep is called by updateToStep in NewConsensusState before the eventBus is set!
if cs.eventBus != nil {
cs.eventBus.PublishEventNewRoundStep(rs)
}
}
//-----------------------------------------
// the main go routines
// 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.
// ConsensusState must be locked before any internal state is updated.
func (cs *ConsensusState) receiveRoutine(maxSteps int) {
defer func() {
if r := recover(); r != nil {
cs.Logger.Error("CONSENSUS FAILURE!!!", "err", r, "stack", string(debug.Stack()))
}
}()
for {
if maxSteps > 0 {
if cs.nSteps >= maxSteps {
cs.Logger.Info("reached max steps. exiting receive routine")
cs.nSteps = 0
return
}
}
rs := cs.RoundState
var mi msgInfo
select {
case height := <-cs.mempool.TxsAvailable():
cs.handleTxsAvailable(height)
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)
case mi = <-cs.internalMsgQueue:
cs.wal.Save(mi)
// handles proposals, block parts, votes
cs.handleMsg(mi)
case ti := <-cs.timeoutTicker.Chan(): // 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():
// NOTE: the internalMsgQueue may have signed messages from our
// priv_val that haven't hit the WAL, but its ok because
// priv_val tracks LastSig
// close wal now that we're done writing to it
cs.wal.Stop()
close(cs.done)
return
}
}
}
// state transitions on complete-proposal, 2/3-any, 2/3-one
func (cs *ConsensusState) handleMsg(mi msgInfo) {
cs.mtx.Lock()
defer cs.mtx.Unlock()
var err error
msg, peerID := mi.Msg, mi.PeerID
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, peerID != "")
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, peerID)
if err == ErrAddingVote {
// TODO: punish peer
// We probably don't want to stop the peer here. The vote does not
// necessarily comes from a malicious peer but can be just broadcasted by
// a typical peer.
// https://github.com/tendermint/tendermint/issues/1281
}
// 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:
cs.Logger.Error("Unknown msg type", reflect.TypeOf(msg))
}
if err != nil {
cs.Logger.Error("Error with msg", "type", reflect.TypeOf(msg), "peer", peerID, "err", err, "msg", msg)
}
}
func (cs *ConsensusState) handleTimeout(ti timeoutInfo, rs cstypes.RoundState) {
cs.Logger.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) {
cs.Logger.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 cstypes.RoundStepNewHeight:
// NewRound event fired from enterNewRound.
// XXX: should we fire timeout here (for timeout commit)?
cs.enterNewRound(ti.Height, 0)
case cstypes.RoundStepNewRound:
cs.enterPropose(ti.Height, 0)
case cstypes.RoundStepPropose:
cs.eventBus.PublishEventTimeoutPropose(cs.RoundStateEvent())
cs.enterPrevote(ti.Height, ti.Round)
case cstypes.RoundStepPrevoteWait:
cs.eventBus.PublishEventTimeoutWait(cs.RoundStateEvent())
cs.enterPrecommit(ti.Height, ti.Round)
case cstypes.RoundStepPrecommitWait:
cs.eventBus.PublishEventTimeoutWait(cs.RoundStateEvent())
cs.enterNewRound(ti.Height, ti.Round+1)
default:
panic(cmn.Fmt("Invalid timeout step: %v", ti.Step))
}
}
func (cs *ConsensusState) handleTxsAvailable(height int64) {
cs.mtx.Lock()
defer cs.mtx.Unlock()
// we only need to do this for round 0
cs.enterPropose(height, 0)
}
//-----------------------------------------------------------------------------
// State functions
// Used internally by handleTimeout and handleMsg to make state transitions
// Enter: `timeoutNewHeight` by startTime (commitTime+timeoutCommit),
// or, if SkipTimeout==true, after receiving all precommits from (height,round-1)
// Enter: `timeoutPrecommits` after any +2/3 precommits from (height,round-1)
// Enter: +2/3 precommits for nil at (height,round-1)
// Enter: +2/3 prevotes any or +2/3 precommits for block or any from (height, round)
// NOTE: cs.StartTime was already set for height.
func (cs *ConsensusState) enterNewRound(height int64, round int) {
if cs.Height != height || round < cs.Round || (cs.Round == round && cs.Step != cstypes.RoundStepNewHeight) {
cs.Logger.Debug(cmn.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) {
cs.Logger.Info("Need to set a buffer and log message here for sanity.", "startTime", cs.StartTime, "now", now)
}
cs.Logger.Info(cmn.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, cstypes.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
cs.eventBus.PublishEventNewRound(cs.RoundStateEvent())
// Wait for txs to be available in the mempool
// before we enterPropose in round 0. If the last block changed the app hash,
// we may need an empty "proof" block, and enterPropose immediately.
waitForTxs := cs.config.WaitForTxs() && round == 0 && !cs.needProofBlock(height)
if waitForTxs {
if cs.config.CreateEmptyBlocksInterval > 0 {
cs.scheduleTimeout(cs.config.EmptyBlocksInterval(), height, round, cstypes.RoundStepNewRound)
}
go cs.proposalHeartbeat(height, round)
} else {
cs.enterPropose(height, round)
}
}
// needProofBlock returns true on the first height (so the genesis app hash is signed right away)
// and where the last block (height-1) caused the app hash to change
func (cs *ConsensusState) needProofBlock(height int64) bool {
if height == 1 {
return true
}
lastBlockMeta := cs.blockStore.LoadBlockMeta(height - 1)
return !bytes.Equal(cs.state.AppHash, lastBlockMeta.Header.AppHash)
}
func (cs *ConsensusState) proposalHeartbeat(height int64, round int) {
counter := 0
addr := cs.privValidator.GetAddress()
valIndex, _ := cs.Validators.GetByAddress(addr)
chainID := cs.state.ChainID
for {
rs := cs.GetRoundState()
// if we've already moved on, no need to send more heartbeats
if rs.Step > cstypes.RoundStepNewRound || rs.Round > round || rs.Height > height {
return
}
heartbeat := &types.Heartbeat{
Height: rs.Height,
Round: rs.Round,
Sequence: counter,
ValidatorAddress: addr,
ValidatorIndex: valIndex,
}
cs.privValidator.SignHeartbeat(chainID, heartbeat)
cs.eventBus.PublishEventProposalHeartbeat(types.EventDataProposalHeartbeat{heartbeat})
counter++
time.Sleep(proposalHeartbeatIntervalSeconds * time.Second)
}
}
// Enter (CreateEmptyBlocks): from enterNewRound(height,round)
// Enter (CreateEmptyBlocks, CreateEmptyBlocksInterval > 0 ): after enterNewRound(height,round), after timeout of CreateEmptyBlocksInterval
// Enter (!CreateEmptyBlocks) : after enterNewRound(height,round), once txs are in the mempool
func (cs *ConsensusState) enterPropose(height int64, round int) {
if cs.Height != height || round < cs.Round || (cs.Round == round && cstypes.RoundStepPropose <= cs.Step) {
cs.Logger.Debug(cmn.Fmt("enterPropose(%v/%v): Invalid args. Current step: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
return
}
cs.Logger.Info(cmn.Fmt("enterPropose(%v/%v). Current: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
defer func() {
// Done enterPropose:
cs.updateRoundStep(round, cstypes.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.config.Propose(round), height, round, cstypes.RoundStepPropose)
// Nothing more to do if we're not a validator
if cs.privValidator == nil {
cs.Logger.Debug("This node is not a validator")
return
}
// if not a validator, we're done
if !cs.Validators.HasAddress(cs.privValidator.GetAddress()) {
cs.Logger.Debug("This node is not a validator", "addr", cs.privValidator.GetAddress(), "vals", cs.Validators)
return
}
cs.Logger.Debug("This node is a validator")
if cs.isProposer() {
cs.Logger.Info("enterPropose: Our turn to propose", "proposer", cs.Validators.GetProposer().Address, "privValidator", cs.privValidator)
cs.decideProposal(height, round)
} else {
cs.Logger.Info("enterPropose: Not our turn to propose", "proposer", cs.Validators.GetProposer().Address, "privValidator", cs.privValidator)
}
}
func (cs *ConsensusState) isProposer() bool {
return bytes.Equal(cs.Validators.GetProposer().Address, cs.privValidator.GetAddress())
}
func (cs *ConsensusState) defaultDecideProposal(height int64, 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 if cs.ValidBlock != nil {
// If there is valid block, choose that.
block, blockParts = cs.ValidBlock, cs.ValidBlockParts
} 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)
if err := cs.privValidator.SignProposal(cs.state.ChainID, proposal); 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}, ""})
}
cs.Logger.Info("Signed proposal", "height", height, "round", round, "proposal", proposal)
cs.Logger.Debug(cmn.Fmt("Signed proposal block: %v", block))
} else {
if !cs.replayMode {
cs.Logger.Error("enterPropose: Error signing proposal", "height", height, "round", round, "err", 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
}
// 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.
cs.Logger.Error("enterPropose: Cannot propose anything: No commit for the previous block.")
return
}
// Mempool validated transactions
txs := cs.mempool.Reap(cs.config.MaxBlockSizeTxs)
block, parts := cs.state.MakeBlock(cs.Height, txs, commit)
evidence := cs.evpool.PendingEvidence()
block.AddEvidence(evidence)
return block, parts
}
// 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 int64, round int) {
if cs.Height != height || round < cs.Round || (cs.Round == round && cstypes.RoundStepPrevote <= cs.Step) {
cs.Logger.Debug(cmn.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, cstypes.RoundStepPrevote)
cs.newStep()
}()
// fire event for how we got here
if cs.isProposalComplete() {
cs.eventBus.PublishEventCompleteProposal(cs.RoundStateEvent())
} else {
// we received +2/3 prevotes for a future round
// TODO: catchup event?
}
cs.Logger.Info(cmn.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 int64, round int) {
logger := cs.Logger.With("height", height, "round", round)
// If a block is locked, prevote that.
if cs.LockedBlock != nil {
logger.Info("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 {
logger.Info("enterPrevote: ProposalBlock is nil")
cs.signAddVote(types.VoteTypePrevote, nil, types.PartSetHeader{})
return
}
// Validate proposal block
err := cs.blockExec.ValidateBlock(cs.state, cs.ProposalBlock)
if err != nil {
// ProposalBlock is invalid, prevote nil.
logger.Error("enterPrevote: ProposalBlock is invalid", "err", 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)
logger.Info("enterPrevote: ProposalBlock is valid")
cs.signAddVote(types.VoteTypePrevote, cs.ProposalBlock.Hash(), cs.ProposalBlockParts.Header())
}
// Enter: any +2/3 prevotes at next round.
func (cs *ConsensusState) enterPrevoteWait(height int64, round int) {
if cs.Height != height || round < cs.Round || (cs.Round == round && cstypes.RoundStepPrevoteWait <= cs.Step) {
cs.Logger.Debug(cmn.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() {
cmn.PanicSanity(cmn.Fmt("enterPrevoteWait(%v/%v), but Prevotes does not have any +2/3 votes", height, round))
}
cs.Logger.Info(cmn.Fmt("enterPrevoteWait(%v/%v). Current: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
defer func() {
// Done enterPrevoteWait:
cs.updateRoundStep(round, cstypes.RoundStepPrevoteWait)
cs.newStep()
}()
// Wait for some more prevotes; enterPrecommit
cs.scheduleTimeout(cs.config.Prevote(round), height, round, cstypes.RoundStepPrevoteWait)
}
// Enter: `timeoutPrevote` after any +2/3 prevotes.
// Enter: +2/3 precomits for block or nil.
// 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 int64, round int) {
if cs.Height != height || round < cs.Round || (cs.Round == round && cstypes.RoundStepPrecommit <= cs.Step) {
cs.Logger.Debug(cmn.Fmt("enterPrecommit(%v/%v): Invalid args. Current step: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
return
}
cs.Logger.Info(cmn.Fmt("enterPrecommit(%v/%v). Current: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))
defer func() {
// Done enterPrecommit:
cs.updateRoundStep(round, cstypes.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 {
cs.Logger.Info("enterPrecommit: No +2/3 prevotes during enterPrecommit while we're locked. Precommitting nil")
} else {
cs.Logger.Info("enterPrecommit: No +2/3 prevotes during enterPrecommit. Precommitting nil.")