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" tmevents "github.com/tendermint/tendermint/libs/events" "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 sm.BlockStore mempool sm.Mempool evpool sm.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{} // synchronous pubsub between consensus state and reactor. // state only emits EventNewRoundStep, EventVote and EventProposalHeartbeat evsw tmevents.EventSwitch } // NewConsensusState returns a new ConsensusState. func NewConsensusState(config *cfg.ConsensusConfig, state sm.State, blockExec *sm.BlockExecutor, blockStore sm.BlockStore, mempool sm.Mempool, evpool sm.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, evsw: tmevents.NewEventSwitch(), } // 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) } // GetRoundStateSimpleJSON returns a json of RoundStateSimple, marshalled using go-amino. func (cs *ConsensusState) GetRoundStateSimpleJSON() ([]byte, error) { cs.mtx.Lock() defer cs.mtx.Unlock() return cdc.MarshalJSON(cs.RoundState.RoundStateSimple()) } // 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 { if err := cs.evsw.Start(); err != nil { return err } // 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) if err := cs.timeoutTicker.Start(); 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.evsw.Stop() 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) 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.Write(rs) cs.nSteps++ // newStep is called by updateToStep in NewConsensusState before the eventBus is set! if cs.eventBus != nil { cs.eventBus.PublishEventNewRoundStep(rs) cs.evsw.FireEvent(types.EventNewRoundStep, &cs.RoundState) } } //----------------------------------------- // 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.Write(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.WriteSync(mi) // NOTE: fsync // handles proposals, block parts, votes cs.handleMsg(mi) case ti := <-cs.timeoutTicker.Chan(): // tockChan: cs.wal.Write(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) if err != nil && msg.Round != cs.Round { cs.Logger.Debug("Received block part from wrong round", "height", cs.Height, "csRound", cs.Round, "blockRound", msg.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", "height", cs.Height, "round", cs.Round, "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) { logger := cs.Logger.With("height", height, "round", round) if cs.Height != height || round < cs.Round || (cs.Round == round && cs.Step != cstypes.RoundStepNewHeight) { 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) { logger.Info("Need to set a buffer and log message here for sanity.", "startTime", cs.StartTime, "now", now) } 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 { logger.Info("Resetting Proposal info") 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}) cs.evsw.FireEvent(types.EventProposalHeartbeat, 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) { logger := cs.Logger.With("height", height, "round", round) if cs.Height != height || round < cs.Round || (cs.Round == round && cstypes.RoundStepPropose <= cs.Step) { logger.Debug(cmn.Fmt("enterPropose(%v/%v): Invalid args. Current step: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step)) return } 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 { logger.Debug("This node is not a validator") return } // if not a validator, we're done if !cs.Validators.HasAddress(cs.privValidator.GetAddress()) { logger.Debug("This node is not a validator", "addr", cs.privValidator.GetAddress(), "vals", cs.Validators) return } logger.Debug("This node is a validator") if cs.isProposer() { logger.Info("enterPropose: Our turn to propose", "proposer", cs.Validators.GetProposer().Address, "privValidator", cs.privValidator) cs.decideProposal(height, round) } else { 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) { logger := cs.Logger.With("height", height, "round", round) if cs.Height != height || round < cs.Round || (cs.Round == round && cstypes.RoundStepPrevoteWait <= cs.Step) { 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)) } 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) { logger := cs.Logger.With("height", height, "round", round) if cs.Height != height || round < cs.Round || (cs.Round == round && cstypes.RoundStepPrecommit <= cs.Step) { logger.Debug(cmn.Fmt("enterPrecommit(%v/%v): Invalid args. Current step: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step)) return } 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() }() // check for a polka blockID, ok := cs.Votes.Prevotes(round).TwoThirdsMajority() // If we don't have a polka, we must precommit nil. if !ok { if cs.LockedBlock != nil { logger.Info("enterPrecommit: No +2/3 prevotes during enterPrecommit while we're locked. Precommitting nil") } else { logger.Info("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. cs.eventBus.PublishEventPolka(cs.RoundStateEvent()) // the latest POLRound should be this round. polRound, _ := cs.Votes.POLInfo() if polRound < round { cmn.PanicSanity(cmn.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 { logger.Info("enterPrecommit: +2/3 prevoted for nil.") } else { logger.Info("enterPrecommit: +2/3 prevoted for nil. Unlocking") cs.LockedRound = 0 cs.LockedBlock = nil cs.LockedBlockParts = nil cs.eventBus.PublishEventUnlock(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) { logger.Info("enterPrecommit: +2/3 prevoted locked block. Relocking") cs.LockedRound = round cs.eventBus.PublishEventRelock(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) { logger.Info("enterPrecommit: +2/3 prevoted proposal block. Locking", "hash", blockID.Hash) // Validate the block. if err := cs.blockExec.ValidateBlock(cs.state, cs.ProposalBlock); err != nil { cmn.PanicConsensus(cmn.Fmt("enterPrecommit: +2/3 prevoted for an invalid block: %v", err)) } cs.LockedRound = round cs.LockedBlock = cs.ProposalBlock cs.LockedBlockParts = cs.ProposalBlockParts cs.eventBus.PublishEventLock(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) } cs.eventBus.PublishEventUnlock(cs.RoundStateEvent()) cs.signAddVote(types.VoteTypePrecommit, nil, types.PartSetHeader{}) } // Enter: any +2/3 precommits for next round. func (cs *ConsensusState) enterPrecommitWait(height int64, round int) { logger := cs.Logger.With("height", height, "round", round) if cs.Height != height || round < cs.Round || (cs.Round == round && cstypes.RoundStepPrecommitWait <= cs.Step) { logger.Debug(cmn.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() { cmn.PanicSanity(cmn.Fmt("enterPrecommitWait(%v/%v), but Precommits does not have any +2/3 votes", height, round)) } logger.Info(cmn.Fmt("enterPrecommitWait(%v/%v). Current: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step)) defer func() { // Done enterPrecommitWait: cs.updateRoundStep(round, cstypes.RoundStepPrecommitWait) cs.newStep() }() // Wait for some more precommits; enterNewRound cs.scheduleTimeout(cs.config.Precommit(round), height, round, cstypes.RoundStepPrecommitWait) } // Enter: +2/3 precommits for block func (cs *ConsensusState) enterCommit(height int64, commitRound int) { logger := cs.Logger.With("height", height, "commitRound", commitRound) if cs.Height != height || cstypes.RoundStepCommit <= cs.Step { logger.Debug(cmn.Fmt("enterCommit(%v/%v): Invalid args. Current step: %v/%v/%v", height, commitRound, cs.Height, cs.Round, cs.Step)) return } logger.Info(cmn.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, cstypes.RoundStepCommit) cs.CommitRound = commitRound cs.CommitTime = time.Now() cs.newStep() // Maybe finalize immediately. cs.tryFinalizeCommit(height) }() blockID, ok := cs.Votes.Precommits(commitRound).TwoThirdsMajority() if !ok { cmn.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) { logger.Info("Commit is for locked block. Set ProposalBlock=LockedBlock", "blockHash", 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) { logger.Info("Commit is for a block we don't know about. Set ProposalBlock=nil", "proposal", cs.ProposalBlock.Hash(), "commit", blockID.Hash) // 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 int64) { logger := cs.Logger.With("height", height) if cs.Height != height { cmn.PanicSanity(cmn.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 { logger.Error("Attempt to finalize failed. There was no +2/3 majority, or +2/3 was for .") 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? logger.Info("Attempt to finalize failed. We don't have the commit block.", "proposal-block", cs.ProposalBlock.Hash(), "commit-block", blockID.Hash) return } // go cs.finalizeCommit(height) } // Increment height and goto cstypes.RoundStepNewHeight func (cs *ConsensusState) finalizeCommit(height int64) { if cs.Height != height || cs.Step != cstypes.RoundStepCommit { cs.Logger.Debug(cmn.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 { cmn.PanicSanity(cmn.Fmt("Cannot finalizeCommit, commit does not have two thirds majority")) } if !blockParts.HasHeader(blockID.PartsHeader) { cmn.PanicSanity(cmn.Fmt("Expected ProposalBlockParts header to be commit header")) } if !block.HashesTo(blockID.Hash) { cmn.PanicSanity(cmn.Fmt("Cannot finalizeCommit, ProposalBlock does not hash to commit hash")) } if err := cs.blockExec.ValidateBlock(cs.state, block); err != nil { cmn.PanicConsensus(cmn.Fmt("+2/3 committed an invalid block: %v", err)) } cs.Logger.Info(cmn.Fmt("Finalizing commit of block with %d txs", block.NumTxs), "height", block.Height, "hash", block.Hash(), "root", block.AppHash) cs.Logger.Info(cmn.Fmt("%v", block)) fail.Fail() // XXX // Save to blockStore. if cs.blockStore.Height() < block.Height { // NOTE: the seenCommit is local justification to commit this block, // but may differ from the LastCommit included in the next block precommits := cs.Votes.Precommits(cs.CommitRound) seenCommit := precommits.MakeCommit() cs.blockStore.SaveBlock(block, blockParts, seenCommit) } else { // Happens during replay if we already saved the block but didn't commit cs.Logger.Info("Calling finalizeCommit on already stored block", "height", block.Height) } fail.Fail() // XXX // Write EndHeightMessage{} for this height, implying that the blockstore // has saved the block. // // If we crash before writing this EndHeightMessage{}, we will recover by // running ApplyBlock during the ABCI handshake when we restart. If we // didn't save the block to the blockstore before writing // EndHeightMessage{}, we'd have to change WAL replay -- currently it // complains about replaying for heights where an #ENDHEIGHT entry already // exists. // // Either way, the ConsensusState should not be resumed until we // successfully call ApplyBlock (ie. later here, or in Handshake after // restart). cs.wal.WriteSync(EndHeightMessage{height}) // NOTE: fsync fail.Fail() // XXX // Create a copy of the state for staging and an event cache for txs. stateCopy := cs.state.Copy() // Execute and commit the block, update and save the state, and update the mempool. // NOTE The block.AppHash wont reflect these txs until the next block. var err error stateCopy, err = cs.blockExec.ApplyBlock(stateCopy, types.BlockID{block.Hash(), blockParts.Header()}, block) if err != nil { cs.Logger.Error("Error on ApplyBlock. Did the application crash? Please restart tendermint", "err", err) err := cmn.Kill() if err != nil { cs.Logger.Error("Failed to kill this process - please do so manually", "err", err) } return } fail.Fail() // XXX // NewHeightStep! cs.updateToState(stateCopy) fail.Fail() // XXX // 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 cstypes.RoundStepNewHeight // * cs.StartTime is set to when we will start round0. } //----------------------------------------------------------------------------- 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 cstypes.RoundStepCommit. if cstypes.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.GetProposer().PubKey.VerifyBytes(proposal.SignBytes(cs.state.ChainID), proposal.Signature) { return ErrInvalidProposalSignature } cs.Proposal = proposal cs.ProposalBlockParts = types.NewPartSetFromHeader(proposal.BlockPartsHeader) cs.Logger.Info("Received proposal", "proposal", proposal) 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 int64, part *types.Part) (added bool, err error) { // Blocks might be reused, so round mismatch is OK if cs.Height != height { cs.Logger.Debug("Received block part from wrong height", "height", height) return false, nil } // We're not expecting a block part. if cs.ProposalBlockParts == nil { cs.Logger.Info("Received a block part when we're not expecting any", "height", height) return false, nil // TODO: bad peer? Return error? } added, err = cs.ProposalBlockParts.AddPart(part) if err != nil { return added, err } if added && cs.ProposalBlockParts.IsComplete() { // Added and completed! _, err = cdc.UnmarshalBinaryReader(cs.ProposalBlockParts.GetReader(), &cs.ProposalBlock, int64(cs.state.ConsensusParams.BlockSize.MaxBytes)) if err != nil { return true, err } // NOTE: it's possible to receive complete proposal blocks for future rounds without having the proposal cs.Logger.Info("Received complete proposal block", "height", cs.ProposalBlock.Height, "hash", cs.ProposalBlock.Hash()) // Update Valid* if we can. prevotes := cs.Votes.Prevotes(cs.Round) blockID, hasTwoThirds := prevotes.TwoThirdsMajority() if hasTwoThirds && !blockID.IsZero() && (cs.ValidRound < cs.Round) { if cs.ProposalBlock.HashesTo(blockID.Hash) { cs.Logger.Info("Updating valid block to new proposal block", "valid-round", cs.Round, "valid-block-hash", cs.ProposalBlock.Hash()) cs.ValidRound = cs.Round cs.ValidBlock = cs.ProposalBlock cs.ValidBlockParts = cs.ProposalBlockParts } // TODO: In case there is +2/3 majority in Prevotes set for some // block and cs.ProposalBlock contains different block, either // proposer is faulty or voting power of faulty processes is more // than 1/3. We should trigger in the future accountability // procedure at this point. } if cs.Step == cstypes.RoundStepPropose && cs.isProposalComplete() { // Move onto the next step cs.enterPrevote(height, cs.Round) } else if cs.Step == cstypes.RoundStepCommit { // If we're waiting on the proposal block... cs.tryFinalizeCommit(height) } return true, nil } return added, nil } // Attempt to add the vote. if its a duplicate signature, dupeout the validator func (cs *ConsensusState) tryAddVote(vote *types.Vote, peerID p2p.ID) error { _, err := cs.addVote(vote, peerID) if err != nil { // If the vote height is off, we'll just ignore it, // But if it's a conflicting sig, add it to the cs.evpool. // If it's otherwise invalid, punish peer. if err == ErrVoteHeightMismatch { return err } else if voteErr, ok := err.(*types.ErrVoteConflictingVotes); ok { if bytes.Equal(vote.ValidatorAddress, cs.privValidator.GetAddress()) { cs.Logger.Error("Found conflicting vote from ourselves. Did you unsafe_reset a validator?", "height", vote.Height, "round", vote.Round, "type", vote.Type) return err } cs.evpool.AddEvidence(voteErr.DuplicateVoteEvidence) return err } else { // Probably an invalid signature / Bad peer. // Seems this can also err sometimes with "Unexpected step" - perhaps not from a bad peer ? cs.Logger.Error("Error attempting to add vote", "err", err) return ErrAddingVote } } return nil } //----------------------------------------------------------------------------- func (cs *ConsensusState) addVote(vote *types.Vote, peerID p2p.ID) (added bool, err error) { cs.Logger.Debug("addVote", "voteHeight", vote.Height, "voteType", vote.Type, "valIndex", vote.ValidatorIndex, "csHeight", cs.Height) // A precommit for the previous height? // These come in while we wait timeoutCommit if vote.Height+1 == cs.Height { if !(cs.Step == cstypes.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 { return added, err } cs.Logger.Info(cmn.Fmt("Added to lastPrecommits: %v", cs.LastCommit.StringShort())) cs.eventBus.PublishEventVote(types.EventDataVote{vote}) cs.evsw.FireEvent(types.EventVote, vote) // if we can skip timeoutCommit and have all the votes now, if cs.config.SkipTimeoutCommit && cs.LastCommit.HasAll() { // go straight to new round (skip timeout commit) // cs.scheduleTimeout(time.Duration(0), cs.Height, 0, cstypes.RoundStepNewHeight) cs.enterNewRound(cs.Height, 0) } return } // Height mismatch is ignored. // Not necessarily a bad peer, but not favourable behaviour. if vote.Height != cs.Height { err = ErrVoteHeightMismatch cs.Logger.Info("Vote ignored and not added", "voteHeight", vote.Height, "csHeight", cs.Height, "err", err) return } height := cs.Height added, err = cs.Votes.AddVote(vote, peerID) if !added { // Either duplicate, or error upon cs.Votes.AddByIndex() return } cs.eventBus.PublishEventVote(types.EventDataVote{vote}) cs.evsw.FireEvent(types.EventVote, vote) switch vote.Type { case types.VoteTypePrevote: prevotes := cs.Votes.Prevotes(vote.Round) cs.Logger.Info("Added to prevote", "vote", vote, "prevotes", prevotes.StringShort()) // If +2/3 prevotes for a block or nil for *any* round: if blockID, ok := prevotes.TwoThirdsMajority(); ok { // There was a polka! // If we're locked but this is a recent polka, unlock. // If it matches our ProposalBlock, update the ValidBlock // Unlock if `cs.LockedRound < vote.Round <= cs.Round` // NOTE: If vote.Round > cs.Round, we'll deal with it when we get to vote.Round if (cs.LockedBlock != nil) && (cs.LockedRound < vote.Round) && (vote.Round <= cs.Round) && !cs.LockedBlock.HashesTo(blockID.Hash) { cs.Logger.Info("Unlocking because of POL.", "lockedRound", cs.LockedRound, "POLRound", vote.Round) cs.LockedRound = 0 cs.LockedBlock = nil cs.LockedBlockParts = nil cs.eventBus.PublishEventUnlock(cs.RoundStateEvent()) } // Update Valid* if we can. // NOTE: our proposal block may be nil or not what received a polka.. // TODO: we may want to still update the ValidBlock and obtain it via gossipping if !blockID.IsZero() && (cs.ValidRound < vote.Round) && (vote.Round <= cs.Round) && cs.ProposalBlock.HashesTo(blockID.Hash) { cs.Logger.Info("Updating ValidBlock because of POL.", "validRound", cs.ValidRound, "POLRound", vote.Round) cs.ValidRound = vote.Round cs.ValidBlock = cs.ProposalBlock cs.ValidBlockParts = cs.ProposalBlockParts } } // If +2/3 prevotes for *anything* for this or future round: 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) cs.Logger.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) if cs.config.SkipTimeoutCommit && precommits.HasAll() { // if we have all the votes now, // go straight to new round (skip timeout commit) // cs.scheduleTimeout(time.Duration(0), cs.Height, 0, cstypes.RoundStepNewHeight) cs.enterNewRound(cs.Height, 0) } } } else if cs.Round <= vote.Round && precommits.HasTwoThirdsAny() { cs.enterNewRound(height, vote.Round) cs.enterPrecommit(height, vote.Round) cs.enterPrecommitWait(height, vote.Round) } default: panic(cmn.Fmt("Unexpected vote type %X", vote.Type)) // go-wire should prevent this. } return } func (cs *ConsensusState) signVote(type_ byte, hash []byte, header types.PartSetHeader) (*types.Vote, error) { addr := cs.privValidator.GetAddress() valIndex, _ := cs.Validators.GetByAddress(addr) vote := &types.Vote{ ValidatorAddress: addr, ValidatorIndex: valIndex, Height: cs.Height, Round: cs.Round, Timestamp: time.Now().UTC(), 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 we don't have a key or we're not in the validator set, do nothing 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}, ""}) cs.Logger.Info("Signed and pushed vote", "height", cs.Height, "round", cs.Round, "vote", vote, "err", err) return vote } //if !cs.replayMode { cs.Logger.Error("Error signing vote", "height", cs.Height, "round", cs.Round, "vote", vote, "err", err) //} return nil } //--------------------------------------------------------- func CompareHRS(h1 int64, r1 int, s1 cstypes.RoundStepType, h2 int64, r2 int, s2 cstypes.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 }