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500 lines
17 KiB
500 lines
17 KiB
package consensus
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import (
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"bytes"
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"context"
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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"github.com/tendermint/tendermint/abci/example/kvstore"
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"github.com/tendermint/tendermint/internal/eventbus"
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tmpubsub "github.com/tendermint/tendermint/internal/pubsub"
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"github.com/tendermint/tendermint/libs/log"
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tmtimemocks "github.com/tendermint/tendermint/libs/time/mocks"
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tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
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"github.com/tendermint/tendermint/types"
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)
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const (
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// blockTimeIota is used in the test harness as the time between
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// blocks when not otherwise specified.
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blockTimeIota = time.Millisecond
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)
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// pbtsTestHarness constructs a Tendermint network that can be used for testing the
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// implementation of the Proposer-Based timestamps algorithm.
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// It runs a series of consensus heights and captures timing of votes and events.
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type pbtsTestHarness struct {
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// configuration options set by the user of the test harness.
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pbtsTestConfiguration
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// The timestamp of the first block produced by the network.
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firstBlockTime time.Time
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// The Tendermint consensus state machine being run during
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// a run of the pbtsTestHarness.
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observedState *State
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// A stub for signing votes and messages using the key
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// from the observedState.
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observedValidator *validatorStub
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// A list of simulated validators that interact with the observedState and are
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// fully controlled by the test harness.
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otherValidators []*validatorStub
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// The mock time source used by all of the validator stubs in the test harness.
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// This mock clock allows the test harness to produce votes and blocks with arbitrary
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// timestamps.
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validatorClock *tmtimemocks.Source
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chainID string
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// channels for verifying that the observed validator completes certain actions.
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ensureProposalCh, roundCh, blockCh, ensureVoteCh <-chan tmpubsub.Message
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// channel of events from the observed validator annotated with the timestamp
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// the event was received.
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eventCh <-chan timestampedEvent
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currentHeight int64
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currentRound int32
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}
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type pbtsTestConfiguration struct {
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// The timestamp consensus parameters to be used by the state machine under test.
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synchronyParams types.SynchronyParams
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// The setting to use for the TimeoutPropose configuration parameter.
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timeoutPropose time.Duration
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// The genesis time
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genesisTime time.Time
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// The times offset from height 1 block time of the block proposed at height 2.
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height2ProposedBlockOffset time.Duration
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// The time offset from height 1 block time at which the proposal at height 2 should be delivered.
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height2ProposalTimeDeliveryOffset time.Duration
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// The time offset from height 1 block time of the block proposed at height 4.
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// At height 4, the proposed block and the deliver offsets are the same so
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// that timely-ness does not affect height 4.
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height4ProposedBlockOffset time.Duration
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}
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func newPBTSTestHarness(ctx context.Context, t *testing.T, tc pbtsTestConfiguration) pbtsTestHarness {
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t.Helper()
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const validators = 4
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cfg := configSetup(t)
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clock := new(tmtimemocks.Source)
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if tc.genesisTime.IsZero() {
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tc.genesisTime = time.Now()
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}
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if tc.height4ProposedBlockOffset == 0 {
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// Set a default height4ProposedBlockOffset.
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// Use a proposed block time that is greater than the time that the
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// block at height 2 was delivered. Height 3 is not relevant for testing
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// and always occurs blockTimeIota before height 4. If not otherwise specified,
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// height 4 therefore occurs 2*blockTimeIota after height 2.
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tc.height4ProposedBlockOffset = tc.height2ProposalTimeDeliveryOffset + 2*blockTimeIota
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}
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cfg.Consensus.TimeoutPropose = tc.timeoutPropose
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consensusParams := types.DefaultConsensusParams()
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consensusParams.Synchrony = tc.synchronyParams
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state, privVals := makeGenesisState(ctx, t, cfg, genesisStateArgs{
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Params: consensusParams,
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Time: tc.genesisTime,
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Validators: validators,
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})
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cs := newState(ctx, t, log.NewNopLogger(), state, privVals[0], kvstore.NewApplication())
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vss := make([]*validatorStub, validators)
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for i := 0; i < validators; i++ {
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vss[i] = newValidatorStub(privVals[i], int32(i))
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}
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incrementHeight(vss[1:]...)
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for _, vs := range vss {
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vs.clock = clock
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}
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pubKey, err := vss[0].PrivValidator.GetPubKey(ctx)
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require.NoError(t, err)
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eventCh := timestampedCollector(ctx, t, cs.eventBus)
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return pbtsTestHarness{
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pbtsTestConfiguration: tc,
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observedValidator: vss[0],
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observedState: cs,
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otherValidators: vss[1:],
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validatorClock: clock,
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currentHeight: 1,
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chainID: cfg.ChainID(),
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roundCh: subscribe(ctx, t, cs.eventBus, types.EventQueryNewRound),
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ensureProposalCh: subscribe(ctx, t, cs.eventBus, types.EventQueryCompleteProposal),
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blockCh: subscribe(ctx, t, cs.eventBus, types.EventQueryNewBlock),
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ensureVoteCh: subscribeToVoterBuffered(ctx, t, cs, pubKey.Address()),
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eventCh: eventCh,
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}
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}
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func (p *pbtsTestHarness) observedValidatorProposerHeight(ctx context.Context, t *testing.T, previousBlockTime time.Time) (heightResult, time.Time) {
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p.validatorClock.On("Now").Return(p.genesisTime.Add(p.height2ProposedBlockOffset)).Times(6)
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ensureNewRound(t, p.roundCh, p.currentHeight, p.currentRound)
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timeout := time.Until(previousBlockTime.Add(ensureTimeout))
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ensureProposalWithTimeout(t, p.ensureProposalCh, p.currentHeight, p.currentRound, nil, timeout)
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rs := p.observedState.GetRoundState()
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bid := types.BlockID{Hash: rs.ProposalBlock.Hash(), PartSetHeader: rs.ProposalBlockParts.Header()}
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ensurePrevote(t, p.ensureVoteCh, p.currentHeight, p.currentRound)
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signAddVotes(ctx, t, p.observedState, tmproto.PrevoteType, p.chainID, bid, p.otherValidators...)
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signAddVotes(ctx, t, p.observedState, tmproto.PrecommitType, p.chainID, bid, p.otherValidators...)
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ensurePrecommit(t, p.ensureVoteCh, p.currentHeight, p.currentRound)
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ensureNewBlock(t, p.blockCh, p.currentHeight)
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vk, err := p.observedValidator.GetPubKey(ctx)
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require.NoError(t, err)
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res := collectHeightResults(ctx, t, p.eventCh, p.currentHeight, vk.Address())
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p.currentHeight++
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incrementHeight(p.otherValidators...)
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return res, rs.ProposalBlock.Time
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}
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func (p *pbtsTestHarness) height2(ctx context.Context, t *testing.T) heightResult {
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signer := p.otherValidators[0].PrivValidator
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return p.nextHeight(ctx, t, signer,
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p.firstBlockTime.Add(p.height2ProposalTimeDeliveryOffset),
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p.firstBlockTime.Add(p.height2ProposedBlockOffset),
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p.firstBlockTime.Add(p.height2ProposedBlockOffset+10*blockTimeIota))
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}
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func (p *pbtsTestHarness) intermediateHeights(ctx context.Context, t *testing.T) {
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signer := p.otherValidators[1].PrivValidator
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p.nextHeight(ctx, t, signer,
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p.firstBlockTime.Add(p.height2ProposedBlockOffset+10*blockTimeIota),
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p.firstBlockTime.Add(p.height2ProposedBlockOffset+10*blockTimeIota),
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p.firstBlockTime.Add(p.height4ProposedBlockOffset))
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signer = p.otherValidators[2].PrivValidator
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p.nextHeight(ctx, t, signer,
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p.firstBlockTime.Add(p.height4ProposedBlockOffset),
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p.firstBlockTime.Add(p.height4ProposedBlockOffset),
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time.Now())
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}
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func (p *pbtsTestHarness) height5(ctx context.Context, t *testing.T) (heightResult, time.Time) {
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return p.observedValidatorProposerHeight(ctx, t, p.firstBlockTime.Add(p.height4ProposedBlockOffset))
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}
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func (p *pbtsTestHarness) nextHeight(ctx context.Context, t *testing.T, proposer types.PrivValidator, deliverTime, proposedTime, nextProposedTime time.Time) heightResult {
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p.validatorClock.On("Now").Return(nextProposedTime).Times(6)
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ensureNewRound(t, p.roundCh, p.currentHeight, p.currentRound)
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b, err := p.observedState.createProposalBlock(ctx)
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require.NoError(t, err)
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b.Height = p.currentHeight
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b.Header.Height = p.currentHeight
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b.Header.Time = proposedTime
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k, err := proposer.GetPubKey(ctx)
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require.NoError(t, err)
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b.Header.ProposerAddress = k.Address()
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ps, err := b.MakePartSet(types.BlockPartSizeBytes)
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require.NoError(t, err)
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bid := types.BlockID{Hash: b.Hash(), PartSetHeader: ps.Header()}
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prop := types.NewProposal(p.currentHeight, 0, -1, bid, proposedTime)
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tp := prop.ToProto()
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if err := proposer.SignProposal(ctx, p.observedState.state.ChainID, tp); err != nil {
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t.Fatalf("error signing proposal: %s", err)
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}
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time.Sleep(time.Until(deliverTime))
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prop.Signature = tp.Signature
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if err := p.observedState.SetProposalAndBlock(ctx, prop, b, ps, "peerID"); err != nil {
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t.Fatal(err)
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}
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ensureProposal(t, p.ensureProposalCh, p.currentHeight, 0, bid)
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ensurePrevote(t, p.ensureVoteCh, p.currentHeight, p.currentRound)
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signAddVotes(ctx, t, p.observedState, tmproto.PrevoteType, p.chainID, bid, p.otherValidators...)
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signAddVotes(ctx, t, p.observedState, tmproto.PrecommitType, p.chainID, bid, p.otherValidators...)
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ensurePrecommit(t, p.ensureVoteCh, p.currentHeight, p.currentRound)
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vk, err := p.observedValidator.GetPubKey(ctx)
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require.NoError(t, err)
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res := collectHeightResults(ctx, t, p.eventCh, p.currentHeight, vk.Address())
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ensureNewBlock(t, p.blockCh, p.currentHeight)
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p.currentHeight++
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incrementHeight(p.otherValidators...)
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return res
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}
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func timestampedCollector(ctx context.Context, t *testing.T, eb *eventbus.EventBus) <-chan timestampedEvent {
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t.Helper()
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// Since eventCh is not read until the end of each height, it must be large
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// enough to hold all of the events produced during a single height.
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eventCh := make(chan timestampedEvent, 100)
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if err := eb.Observe(ctx, func(msg tmpubsub.Message) error {
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eventCh <- timestampedEvent{
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ts: time.Now(),
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m: msg,
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}
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return nil
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}, types.EventQueryVote, types.EventQueryCompleteProposal); err != nil {
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t.Fatalf("Failed to observe query %v: %v", types.EventQueryVote, err)
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}
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return eventCh
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}
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func collectHeightResults(ctx context.Context, t *testing.T, eventCh <-chan timestampedEvent, height int64, address []byte) heightResult {
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t.Helper()
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var res heightResult
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for event := range eventCh {
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switch v := event.m.Data().(type) {
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case types.EventDataVote:
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if v.Vote.Height > height {
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t.Fatalf("received prevote from unexpected height, expected: %d, saw: %d", height, v.Vote.Height)
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}
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if !bytes.Equal(address, v.Vote.ValidatorAddress) {
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continue
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}
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if v.Vote.Type != tmproto.PrevoteType {
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continue
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}
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res.prevote = v.Vote
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res.prevoteIssuedAt = event.ts
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case types.EventDataCompleteProposal:
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if v.Height > height {
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t.Fatalf("received proposal from unexpected height, expected: %d, saw: %d", height, v.Height)
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}
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res.proposalIssuedAt = event.ts
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}
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if res.isComplete() {
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return res
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}
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}
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t.Fatalf("complete height result never seen for height %d", height)
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panic("unreachable")
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}
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type timestampedEvent struct {
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ts time.Time
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m tmpubsub.Message
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}
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func (p *pbtsTestHarness) run(ctx context.Context, t *testing.T) resultSet {
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startTestRound(ctx, p.observedState, p.currentHeight, p.currentRound)
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r1, proposalBlockTime := p.observedValidatorProposerHeight(ctx, t, p.genesisTime)
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p.firstBlockTime = proposalBlockTime
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r2 := p.height2(ctx, t)
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p.intermediateHeights(ctx, t)
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r5, _ := p.height5(ctx, t)
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return resultSet{
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genesisHeight: r1,
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height2: r2,
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height5: r5,
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}
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}
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type resultSet struct {
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genesisHeight heightResult
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height2 heightResult
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height5 heightResult
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}
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type heightResult struct {
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proposalIssuedAt time.Time
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prevote *types.Vote
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prevoteIssuedAt time.Time
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}
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func (hr heightResult) isComplete() bool {
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return !hr.proposalIssuedAt.IsZero() && !hr.prevoteIssuedAt.IsZero() && hr.prevote != nil
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}
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// TestProposerWaitsForGenesisTime tests that a proposer will not propose a block
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// until after the genesis time has passed. The test sets the genesis time in the
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// future and then ensures that the observed validator waits to propose a block.
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func TestProposerWaitsForGenesisTime(t *testing.T) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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// create a genesis time far (enough) in the future.
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initialTime := time.Now().Add(800 * time.Millisecond)
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cfg := pbtsTestConfiguration{
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synchronyParams: types.SynchronyParams{
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Precision: 10 * time.Millisecond,
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MessageDelay: 10 * time.Millisecond,
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},
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timeoutPropose: 10 * time.Millisecond,
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genesisTime: initialTime,
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height2ProposalTimeDeliveryOffset: 10 * time.Millisecond,
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height2ProposedBlockOffset: 10 * time.Millisecond,
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height4ProposedBlockOffset: 30 * time.Millisecond,
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}
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pbtsTest := newPBTSTestHarness(ctx, t, cfg)
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results := pbtsTest.run(ctx, t)
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// ensure that the proposal was issued after the genesis time.
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assert.True(t, results.genesisHeight.proposalIssuedAt.After(cfg.genesisTime))
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}
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// TestProposerWaitsForPreviousBlock tests that the proposer of a block waits until
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// the block time of the previous height has passed to propose the next block.
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// The test harness ensures that the observed validator will be the proposer at
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// height 1 and height 5. The test sets the block time of height 4 in the future
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// and then verifies that the observed validator waits until after the block time
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// of height 4 to propose a block at height 5.
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func TestProposerWaitsForPreviousBlock(t *testing.T) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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initialTime := time.Now().Add(time.Millisecond * 50)
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cfg := pbtsTestConfiguration{
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synchronyParams: types.SynchronyParams{
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Precision: 100 * time.Millisecond,
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MessageDelay: 500 * time.Millisecond,
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},
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timeoutPropose: 50 * time.Millisecond,
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genesisTime: initialTime,
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height2ProposalTimeDeliveryOffset: 150 * time.Millisecond,
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height2ProposedBlockOffset: 100 * time.Millisecond,
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height4ProposedBlockOffset: 800 * time.Millisecond,
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}
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pbtsTest := newPBTSTestHarness(ctx, t, cfg)
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results := pbtsTest.run(ctx, t)
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// the observed validator is the proposer at height 5.
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// ensure that the observed validator did not propose a block until after
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// the time configured for height 4.
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assert.True(t, results.height5.proposalIssuedAt.After(pbtsTest.firstBlockTime.Add(cfg.height4ProposedBlockOffset)))
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// Ensure that the validator issued a prevote for a non-nil block.
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assert.NotNil(t, results.height5.prevote.BlockID.Hash)
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}
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func TestProposerWaitTime(t *testing.T) {
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genesisTime, err := time.Parse(time.RFC3339, "2019-03-13T23:00:00Z")
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require.NoError(t, err)
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testCases := []struct {
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name string
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previousBlockTime time.Time
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localTime time.Time
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expectedWait time.Duration
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}{
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{
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name: "block time greater than local time",
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previousBlockTime: genesisTime.Add(5 * time.Nanosecond),
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localTime: genesisTime.Add(1 * time.Nanosecond),
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expectedWait: 4 * time.Nanosecond,
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},
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{
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name: "local time greater than block time",
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previousBlockTime: genesisTime.Add(1 * time.Nanosecond),
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localTime: genesisTime.Add(5 * time.Nanosecond),
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expectedWait: 0,
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},
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{
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name: "both times equal",
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previousBlockTime: genesisTime.Add(5 * time.Nanosecond),
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localTime: genesisTime.Add(5 * time.Nanosecond),
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expectedWait: 0,
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},
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}
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for _, testCase := range testCases {
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t.Run(testCase.name, func(t *testing.T) {
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mockSource := new(tmtimemocks.Source)
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mockSource.On("Now").Return(testCase.localTime)
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ti := proposerWaitTime(mockSource, testCase.previousBlockTime)
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assert.Equal(t, testCase.expectedWait, ti)
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})
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}
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}
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func TestTimelyProposal(t *testing.T) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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initialTime := time.Now()
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cfg := pbtsTestConfiguration{
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synchronyParams: types.SynchronyParams{
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Precision: 10 * time.Millisecond,
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MessageDelay: 140 * time.Millisecond,
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},
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timeoutPropose: 40 * time.Millisecond,
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genesisTime: initialTime,
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height2ProposedBlockOffset: 15 * time.Millisecond,
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height2ProposalTimeDeliveryOffset: 30 * time.Millisecond,
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}
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pbtsTest := newPBTSTestHarness(ctx, t, cfg)
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results := pbtsTest.run(ctx, t)
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require.NotNil(t, results.height2.prevote.BlockID.Hash)
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}
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func TestTooFarInThePastProposal(t *testing.T) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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// localtime > proposedBlockTime + MsgDelay + Precision
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cfg := pbtsTestConfiguration{
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synchronyParams: types.SynchronyParams{
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Precision: 1 * time.Millisecond,
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MessageDelay: 10 * time.Millisecond,
|
|
},
|
|
timeoutPropose: 50 * time.Millisecond,
|
|
height2ProposedBlockOffset: 15 * time.Millisecond,
|
|
height2ProposalTimeDeliveryOffset: 27 * time.Millisecond,
|
|
}
|
|
|
|
pbtsTest := newPBTSTestHarness(ctx, t, cfg)
|
|
results := pbtsTest.run(ctx, t)
|
|
|
|
require.Nil(t, results.height2.prevote.BlockID.Hash)
|
|
}
|
|
|
|
func TestTooFarInTheFutureProposal(t *testing.T) {
|
|
ctx, cancel := context.WithCancel(context.Background())
|
|
defer cancel()
|
|
|
|
// localtime < proposedBlockTime - Precision
|
|
cfg := pbtsTestConfiguration{
|
|
synchronyParams: types.SynchronyParams{
|
|
Precision: 1 * time.Millisecond,
|
|
MessageDelay: 10 * time.Millisecond,
|
|
},
|
|
timeoutPropose: 50 * time.Millisecond,
|
|
height2ProposedBlockOffset: 100 * time.Millisecond,
|
|
height2ProposalTimeDeliveryOffset: 10 * time.Millisecond,
|
|
height4ProposedBlockOffset: 150 * time.Millisecond,
|
|
}
|
|
|
|
pbtsTest := newPBTSTestHarness(ctx, t, cfg)
|
|
results := pbtsTest.run(ctx, t)
|
|
|
|
require.Nil(t, results.height2.prevote.BlockID.Hash)
|
|
}
|