Exemplo n.º 1
0
// What we want:
// dont see P0, lock on P1 at R1, dont unlock using P0 at R2
func TestLockPOLSafety2(t *testing.T) {
	cs1, vss := randConsensusState(4)
	cs2, cs3, cs4 := vss[1], vss[2], vss[3]

	proposalCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringCompleteProposal(), 1)
	timeoutProposeCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringTimeoutPropose(), 1)
	timeoutWaitCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringTimeoutWait(), 1)
	newRoundCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringNewRound(), 1)
	unlockCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringUnlock(), 1)
	voteCh := subscribeToVoter(cs1, cs1.privValidator.Address)

	// the block for R0: gets polkad but we miss it
	// (even though we signed it, shhh)
	_, propBlock0 := decideProposal(cs1, vss[0], cs1.Height, cs1.Round)
	propBlockHash0 := propBlock0.Hash()
	propBlockParts0 := propBlock0.MakePartSet()

	// the others sign a polka but we don't see it
	prevotes := signVoteMany(types.VoteTypePrevote, propBlockHash0, propBlockParts0.Header(), cs2, cs3, cs4)

	// the block for round 1
	prop1, propBlock1 := decideProposal(cs1, cs2, cs2.Height, cs2.Round+1)
	propBlockHash1 := propBlock1.Hash()
	propBlockParts1 := propBlock1.MakePartSet()

	incrementRound(cs2, cs3, cs4)

	cs1.updateRoundStep(0, RoundStepPrecommitWait)

	log.Notice("### ONTO Round 1")
	// jump in at round 1
	height := cs1.Height
	startTestRound(cs1, height, 1)
	<-newRoundCh

	cs1.SetProposalAndBlock(prop1, propBlock1, propBlockParts1, "some peer")
	<-proposalCh

	<-voteCh // prevote

	signAddVoteToFromMany(types.VoteTypePrevote, cs1, propBlockHash1, propBlockParts1.Header(), cs2, cs3, cs4)

	<-voteCh // precommit
	// the proposed block should now be locked and our precommit added
	validatePrecommit(t, cs1, 1, 1, vss[0], propBlockHash1, propBlockHash1)

	// add precommits from the rest
	signAddVoteToFromMany(types.VoteTypePrecommit, cs1, nil, types.PartSetHeader{}, cs2, cs4)
	signAddVoteToFrom(types.VoteTypePrecommit, cs1, cs3, propBlockHash1, propBlockParts1.Header())

	incrementRound(cs2, cs3, cs4)

	// timeout of precommit wait to new round
	<-timeoutWaitCh

	// in round 2 we see the polkad block from round 0
	newProp := types.NewProposal(height, 2, propBlockParts0.Header(), 0)
	if err := cs3.SignProposal(chainID, newProp); err != nil {
		t.Fatal(err)
	}
	cs1.SetProposalAndBlock(newProp, propBlock0, propBlockParts0, "some peer")
	addVoteToFromMany(cs1, prevotes, cs2, cs3, cs4) // add the pol votes

	<-newRoundCh
	log.Notice("### ONTO Round 2")
	/*Round2
	// now we see the polka from round 1, but we shouldnt unlock
	*/

	select {
	case <-timeoutProposeCh:
		<-proposalCh
	case <-proposalCh:
	}

	select {
	case <-unlockCh:
		t.Fatal("validator unlocked using an old polka")
	case <-voteCh:
		// prevote our locked block
	}
	validatePrevote(t, cs1, 2, vss[0], propBlockHash1)

}
Exemplo n.º 2
0
// 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, timedOut bool) {
	cs.mtx.Lock()
	defer cs.mtx.Unlock()
	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
	}

	if timedOut {
		cs.evsw.FireEvent(types.EventStringTimeoutWait(), cs.RoundStateEvent())
	}

	log.Info(Fmt("EnterPrecommit(%v/%v). Current: %v/%v/%v", height, round, cs.Height, cs.Round, cs.Step))

	defer func() {
		// Done EnterPrecommit:
		cs.Round = round
		cs.Step = RoundStepPrecommit
		cs.newStepCh <- cs.getRoundState()
	}()

	hash, partsHeader, ok := cs.Votes.Prevotes(round).TwoThirdsMajority()

	// If we don't have a polka, we must precommit nil
	if !ok {
		if cs.LockedBlock != nil {
			log.Info("EnterPrecommit: No +2/3 prevotes during EnterPrecommit while we're locked. Precommitting nil")
		} else {
			log.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.evsw.FireEvent(types.EventStringPolka(), cs.RoundStateEvent())

	// the latest POLRound should be this round
	if cs.Votes.POLRound() < round {
		PanicSanity(Fmt("This POLRound should be %v but got %", round, cs.Votes.POLRound()))
	}

	// +2/3 prevoted nil. Unlock and precommit nil.
	if len(hash) == 0 {
		if cs.LockedBlock == nil {
			log.Info("EnterPrecommit: +2/3 prevoted for nil.")
		} else {
			log.Info("EnterPrecommit: +2/3 prevoted for nil. Unlocking")
			cs.LockedRound = 0
			cs.LockedBlock = nil
			cs.LockedBlockParts = nil
			cs.evsw.FireEvent(types.EventStringUnlock(), 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(hash) {
		log.Info("EnterPrecommit: +2/3 prevoted locked block. Relocking")
		cs.LockedRound = round
		cs.evsw.FireEvent(types.EventStringRelock(), cs.RoundStateEvent())
		cs.signAddVote(types.VoteTypePrecommit, hash, partsHeader)
		return
	}

	// If +2/3 prevoted for proposal block, stage and precommit it
	if cs.ProposalBlock.HashesTo(hash) {
		log.Info("EnterPrecommit: +2/3 prevoted proposal block. Locking", "hash", hash)
		// Validate the block.
		if err := cs.stageBlock(cs.ProposalBlock, cs.ProposalBlockParts); 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
		cs.evsw.FireEvent(types.EventStringLock(), cs.RoundStateEvent())
		cs.signAddVote(types.VoteTypePrecommit, hash, 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(partsHeader) {
		cs.ProposalBlock = nil
		cs.ProposalBlockParts = types.NewPartSetFromHeader(partsHeader)
	}
	cs.evsw.FireEvent(types.EventStringUnlock(), cs.RoundStateEvent())
	cs.signAddVote(types.VoteTypePrecommit, nil, types.PartSetHeader{})
	return
}
Exemplo n.º 3
0
// 4 vals, one precommits, other 3 polka at next round, so we unlock and precomit the polka
func TestLockPOLUnlock(t *testing.T) {
	cs1, vss := randConsensusState(4)
	cs2, cs3, cs4 := vss[1], vss[2], vss[3]

	proposalCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringCompleteProposal(), 1)
	timeoutProposeCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringTimeoutPropose(), 1)
	timeoutWaitCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringTimeoutWait(), 1)
	newRoundCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringNewRound(), 1)
	unlockCh := subscribeToEvent(cs1.evsw, "tester", types.EventStringUnlock(), 1)
	voteCh := subscribeToVoter(cs1, cs1.privValidator.Address)

	// everything done from perspective of cs1

	/*
		Round1 (cs1, B) // B B B B // B nil B nil

		eg. didn't see the 2/3 prevotes
	*/

	// start round and wait for propose and prevote
	startTestRound(cs1, cs1.Height, 0)
	<-newRoundCh
	re := <-proposalCh
	rs := re.(types.EventDataRoundState).RoundState.(*RoundState)
	theBlockHash := rs.ProposalBlock.Hash()

	<-voteCh // prevote

	signAddVoteToFromMany(types.VoteTypePrevote, cs1, cs1.ProposalBlock.Hash(), cs1.ProposalBlockParts.Header(), cs2, cs3, cs4)

	<-voteCh //precommit

	// the proposed block should now be locked and our precommit added
	validatePrecommit(t, cs1, 0, 0, vss[0], theBlockHash, theBlockHash)

	// add precommits from the rest
	signAddVoteToFromMany(types.VoteTypePrecommit, cs1, nil, types.PartSetHeader{}, cs2, cs4)
	signAddVoteToFrom(types.VoteTypePrecommit, cs1, cs3, cs1.ProposalBlock.Hash(), cs1.ProposalBlockParts.Header())

	// before we time out into new round, set next proposal block
	prop, propBlock := decideProposal(cs1, cs2, cs2.Height, cs2.Round+1)
	propBlockParts := propBlock.MakePartSet()

	incrementRound(cs2, cs3, cs4)

	// timeout to new round
	re = <-timeoutWaitCh
	rs = re.(types.EventDataRoundState).RoundState.(*RoundState)
	lockedBlockHash := rs.LockedBlock.Hash()

	//XXX: this isnt gauranteed to get there before the timeoutPropose ...
	cs1.SetProposalAndBlock(prop, propBlock, propBlockParts, "some peer")

	<-newRoundCh
	log.Notice("#### ONTO ROUND 1")
	/*
		Round2 (cs2, C) // B nil nil nil // nil nil nil _

		cs1 unlocks!
	*/

	// now we're on a new round and not the proposer,
	// but we should receive the proposal
	select {
	case <-proposalCh:
	case <-timeoutProposeCh:
		<-proposalCh
	}

	// go to prevote, prevote for locked block (not proposal)
	<-voteCh
	validatePrevote(t, cs1, 0, vss[0], lockedBlockHash)
	// now lets add prevotes from everyone else for nil (a polka!)
	signAddVoteToFromMany(types.VoteTypePrevote, cs1, nil, types.PartSetHeader{}, cs2, cs3, cs4)

	// the polka makes us unlock and precommit nil
	<-unlockCh
	<-voteCh // precommit

	// we should have unlocked and committed nil
	// NOTE: since we don't relock on nil, the lock round is 0
	validatePrecommit(t, cs1, 1, 0, vss[0], nil, nil)

	signAddVoteToFromMany(types.VoteTypePrecommit, cs1, nil, types.PartSetHeader{}, cs2, cs3)
	<-newRoundCh
}
Exemplo n.º 4
0
func (cs *ConsensusState) addVote(valIndex int, vote *types.Vote, peerKey string) (added bool, address []byte, err error) {
	log.Debug("addVote", "voteHeight", vote.Height, "voteType", vote.Type, "csHeight", cs.Height)

	defer func() {
		if added {
			cs.evsw.FireEvent(types.EventStringVote(), &types.EventDataVote{valIndex, address, vote})
		}
	}()

	// 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, nil, ErrVoteHeightMismatch
		}
		added, address, err = cs.LastCommit.AddByIndex(valIndex, vote)
		if added {
			log.Info(Fmt("Added to lastPrecommits: %v", cs.LastCommit.StringShort()))
		}
		return
	}

	// A prevote/precommit for this height?
	if vote.Height == cs.Height {
		height := cs.Height
		added, address, err = cs.Votes.AddByIndex(valIndex, vote, peerKey)
		if added {
			switch vote.Type {
			case types.VoteTypePrevote:
				prevotes := cs.Votes.Prevotes(vote.Round)
				log.Info(Fmt("Added to prevotes: %v", 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) {
					hash, _, ok := prevotes.TwoThirdsMajority()
					if ok && !cs.LockedBlock.HashesTo(hash) {
						log.Notice("Unlocking because of POL.", "lockedRound", cs.LockedRound, "POLRound", vote.Round)
						cs.LockedRound = 0
						cs.LockedBlock = nil
						cs.LockedBlockParts = nil
						cs.evsw.FireEvent(types.EventStringUnlock(), cs.RoundStateEvent())
					}
				}
				if cs.Round <= vote.Round && prevotes.HasTwoThirdsAny() {
					// Round-skip over to PrevoteWait or goto Precommit.
					go func() {
						cs.EnterNewRound(height, vote.Round, false)
						if prevotes.HasTwoThirdsMajority() {
							cs.EnterPrecommit(height, vote.Round, false)
						} else {
							cs.EnterPrevote(height, vote.Round, false)
							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() {
						go cs.EnterPrevote(height, cs.Round, false)
					}
				}
			case types.VoteTypePrecommit:
				precommits := cs.Votes.Precommits(vote.Round)
				log.Info(Fmt("Added to precommit: %v", precommits.StringShort()))
				hash, _, ok := precommits.TwoThirdsMajority()
				if ok {
					go func() {
						if len(hash) == 0 {
							cs.EnterNewRound(height, vote.Round+1, false)
						} else {
							cs.EnterNewRound(height, vote.Round, false)
							cs.EnterPrecommit(height, vote.Round, false)
							cs.EnterCommit(height, vote.Round)
						}
					}()
				} else if cs.Round <= vote.Round && precommits.HasTwoThirdsAny() {
					go func() {
						cs.EnterNewRound(height, vote.Round, false)
						cs.EnterPrecommit(height, vote.Round, false)
						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)
	return
}