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490 lines
15 KiB
490 lines
15 KiB
package evidence_test
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import (
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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/mock"
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"github.com/stretchr/testify/require"
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dbm "github.com/tendermint/tm-db"
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"github.com/tendermint/tendermint/evidence"
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"github.com/tendermint/tendermint/evidence/mocks"
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"github.com/tendermint/tendermint/libs/log"
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tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
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sm "github.com/tendermint/tendermint/state"
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smmocks "github.com/tendermint/tendermint/state/mocks"
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"github.com/tendermint/tendermint/store"
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"github.com/tendermint/tendermint/types"
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"github.com/tendermint/tendermint/version"
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)
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const evidenceChainID = "test_chain"
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var (
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defaultEvidenceTime = time.Date(2019, 1, 1, 0, 0, 0, 0, time.UTC)
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defaultEvidenceMaxBytes int64 = 1000
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)
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func TestEvidencePoolBasic(t *testing.T) {
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var (
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height = int64(1)
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stateStore = &smmocks.Store{}
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evidenceDB = dbm.NewMemDB()
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blockStore = &mocks.BlockStore{}
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)
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valSet, privVals := types.RandValidatorSet(1, 10)
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blockStore.On("LoadBlockMeta", mock.AnythingOfType("int64")).Return(
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&types.BlockMeta{Header: types.Header{Time: defaultEvidenceTime}},
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)
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stateStore.On("LoadValidators", mock.AnythingOfType("int64")).Return(valSet, nil)
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stateStore.On("Load").Return(createState(height+1, valSet), nil)
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pool, err := evidence.NewPool(log.TestingLogger(), evidenceDB, stateStore, blockStore)
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require.NoError(t, err)
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// evidence not seen yet:
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evs, size := pool.PendingEvidence(defaultEvidenceMaxBytes)
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require.Equal(t, 0, len(evs))
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require.Zero(t, size)
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ev := types.NewMockDuplicateVoteEvidenceWithValidator(height, defaultEvidenceTime, privVals[0], evidenceChainID)
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// good evidence
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evAdded := make(chan struct{})
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go func() {
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<-pool.EvidenceWaitChan()
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close(evAdded)
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}()
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// evidence seen but not yet committed:
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require.NoError(t, pool.AddEvidence(ev))
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select {
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case <-evAdded:
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case <-time.After(5 * time.Second):
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t.Fatal("evidence was not added to list after 5s")
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}
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next := pool.EvidenceFront()
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require.Equal(t, ev, next.Value.(types.Evidence))
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const evidenceBytes int64 = 372
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evs, size = pool.PendingEvidence(evidenceBytes)
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require.Equal(t, 1, len(evs))
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require.Equal(t, evidenceBytes, size) // check that the size of the single evidence in bytes is correct
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// shouldn't be able to add evidence twice
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require.NoError(t, pool.AddEvidence(ev))
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evs, _ = pool.PendingEvidence(defaultEvidenceMaxBytes)
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require.Equal(t, 1, len(evs))
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}
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// Tests inbound evidence for the right time and height
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func TestAddExpiredEvidence(t *testing.T) {
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var (
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val = types.NewMockPV()
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height = int64(30)
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stateStore = initializeValidatorState(t, val, height)
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evidenceDB = dbm.NewMemDB()
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blockStore = &mocks.BlockStore{}
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expiredEvidenceTime = time.Date(2018, 1, 1, 0, 0, 0, 0, time.UTC)
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expiredHeight = int64(2)
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)
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blockStore.On("LoadBlockMeta", mock.AnythingOfType("int64")).Return(func(h int64) *types.BlockMeta {
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if h == height || h == expiredHeight {
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return &types.BlockMeta{Header: types.Header{Time: defaultEvidenceTime}}
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}
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return &types.BlockMeta{Header: types.Header{Time: expiredEvidenceTime}}
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})
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pool, err := evidence.NewPool(log.TestingLogger(), evidenceDB, stateStore, blockStore)
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require.NoError(t, err)
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testCases := []struct {
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evHeight int64
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evTime time.Time
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expErr bool
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evDescription string
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}{
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{height, defaultEvidenceTime, false, "valid evidence"},
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{expiredHeight, defaultEvidenceTime, false, "valid evidence (despite old height)"},
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{height - 1, expiredEvidenceTime, false, "valid evidence (despite old time)"},
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{expiredHeight - 1, expiredEvidenceTime, true,
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"evidence from height 1 (created at: 2019-01-01 00:00:00 +0000 UTC) is too old"},
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{height, defaultEvidenceTime.Add(1 * time.Minute), true, "evidence time and block time is different"},
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}
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for _, tc := range testCases {
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tc := tc
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t.Run(tc.evDescription, func(t *testing.T) {
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ev := types.NewMockDuplicateVoteEvidenceWithValidator(tc.evHeight, tc.evTime, val, evidenceChainID)
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err := pool.AddEvidence(ev)
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if tc.expErr {
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require.Error(t, err)
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} else {
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require.NoError(t, err)
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}
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})
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}
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}
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func TestReportConflictingVotes(t *testing.T) {
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var height int64 = 10
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pool, pv := defaultTestPool(t, height)
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val := types.NewValidator(pv.PrivKey.PubKey(), 10)
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ev := types.NewMockDuplicateVoteEvidenceWithValidator(height+1, defaultEvidenceTime, pv, evidenceChainID)
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pool.ReportConflictingVotes(ev.VoteA, ev.VoteB)
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// shouldn't be able to submit the same evidence twice
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pool.ReportConflictingVotes(ev.VoteA, ev.VoteB)
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// evidence from consensus should not be added immediately but reside in the consensus buffer
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evList, evSize := pool.PendingEvidence(defaultEvidenceMaxBytes)
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require.Empty(t, evList)
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require.Zero(t, evSize)
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next := pool.EvidenceFront()
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require.Nil(t, next)
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// move to next height and update state and evidence pool
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state := pool.State()
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state.LastBlockHeight++
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state.LastBlockTime = ev.Time()
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state.LastValidators = types.NewValidatorSet([]*types.Validator{val})
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pool.Update(state, []types.Evidence{})
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// should be able to retrieve evidence from pool
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evList, _ = pool.PendingEvidence(defaultEvidenceMaxBytes)
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require.Equal(t, []types.Evidence{ev}, evList)
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}
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func TestEvidencePoolUpdate(t *testing.T) {
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height := int64(21)
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pool, val := defaultTestPool(t, height)
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state := pool.State()
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// create new block (no need to save it to blockStore)
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prunedEv := types.NewMockDuplicateVoteEvidenceWithValidator(
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1,
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defaultEvidenceTime.Add(1*time.Minute),
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val,
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evidenceChainID,
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)
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require.NoError(t, pool.AddEvidence(prunedEv))
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ev := types.NewMockDuplicateVoteEvidenceWithValidator(
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height,
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defaultEvidenceTime.Add(21*time.Minute),
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val,
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evidenceChainID,
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)
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lastCommit := makeCommit(height, val.PrivKey.PubKey().Address())
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block := types.MakeBlock(height+1, []types.Tx{}, lastCommit, []types.Evidence{ev})
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// update state (partially)
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state.LastBlockHeight = height + 1
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state.LastBlockTime = defaultEvidenceTime.Add(22 * time.Minute)
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require.NoError(t, pool.CheckEvidence(types.EvidenceList{ev}))
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pool.Update(state, block.Evidence.Evidence)
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// a) Update marks evidence as committed so pending evidence should be empty
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evList, evSize := pool.PendingEvidence(defaultEvidenceMaxBytes)
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require.Empty(t, evList)
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require.Zero(t, evSize)
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// b) If we try to check this evidence again it should fail because it has already been committed
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err := pool.CheckEvidence(types.EvidenceList{ev})
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if assert.Error(t, err) {
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assert.Equal(t, "evidence was already committed", err.(*types.ErrInvalidEvidence).Reason.Error())
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}
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}
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func TestVerifyPendingEvidencePasses(t *testing.T) {
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var height int64 = 1
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pool, val := defaultTestPool(t, height)
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ev := types.NewMockDuplicateVoteEvidenceWithValidator(
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height,
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defaultEvidenceTime.Add(1*time.Minute),
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val,
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evidenceChainID,
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)
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require.NoError(t, pool.AddEvidence(ev))
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require.NoError(t, pool.CheckEvidence(types.EvidenceList{ev}))
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}
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func TestVerifyDuplicatedEvidenceFails(t *testing.T) {
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var height int64 = 1
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pool, val := defaultTestPool(t, height)
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ev := types.NewMockDuplicateVoteEvidenceWithValidator(
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height,
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defaultEvidenceTime.Add(1*time.Minute),
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val,
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evidenceChainID,
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)
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err := pool.CheckEvidence(types.EvidenceList{ev, ev})
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if assert.Error(t, err) {
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assert.Equal(t, "duplicate evidence", err.(*types.ErrInvalidEvidence).Reason.Error())
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}
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}
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// check that valid light client evidence is correctly validated and stored in
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// evidence pool
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func TestCheckEvidenceWithLightClientAttack(t *testing.T) {
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var (
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nValidators = 5
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validatorPower int64 = 10
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height int64 = 10
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)
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conflictingVals, conflictingPrivVals := types.RandValidatorSet(nValidators, validatorPower)
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trustedHeader := makeHeaderRandom(height)
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trustedHeader.Time = defaultEvidenceTime
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conflictingHeader := makeHeaderRandom(height)
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conflictingHeader.ValidatorsHash = conflictingVals.Hash()
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trustedHeader.ValidatorsHash = conflictingHeader.ValidatorsHash
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trustedHeader.NextValidatorsHash = conflictingHeader.NextValidatorsHash
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trustedHeader.ConsensusHash = conflictingHeader.ConsensusHash
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trustedHeader.AppHash = conflictingHeader.AppHash
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trustedHeader.LastResultsHash = conflictingHeader.LastResultsHash
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// For simplicity we are simulating a duplicate vote attack where all the
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// validators in the conflictingVals set voted twice.
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blockID := makeBlockID(conflictingHeader.Hash(), 1000, []byte("partshash"))
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voteSet := types.NewVoteSet(evidenceChainID, height, 1, tmproto.SignedMsgType(2), conflictingVals)
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commit, err := types.MakeCommit(blockID, height, 1, voteSet, conflictingPrivVals, defaultEvidenceTime)
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require.NoError(t, err)
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ev := &types.LightClientAttackEvidence{
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ConflictingBlock: &types.LightBlock{
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SignedHeader: &types.SignedHeader{
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Header: conflictingHeader,
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Commit: commit,
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},
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ValidatorSet: conflictingVals,
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},
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CommonHeight: 10,
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TotalVotingPower: int64(nValidators) * validatorPower,
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ByzantineValidators: conflictingVals.Validators,
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Timestamp: defaultEvidenceTime,
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}
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trustedBlockID := makeBlockID(trustedHeader.Hash(), 1000, []byte("partshash"))
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trustedVoteSet := types.NewVoteSet(evidenceChainID, height, 1, tmproto.SignedMsgType(2), conflictingVals)
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trustedCommit, err := types.MakeCommit(
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trustedBlockID,
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height,
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1,
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trustedVoteSet,
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conflictingPrivVals,
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defaultEvidenceTime,
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)
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require.NoError(t, err)
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state := sm.State{
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LastBlockTime: defaultEvidenceTime.Add(1 * time.Minute),
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LastBlockHeight: 11,
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ConsensusParams: *types.DefaultConsensusParams(),
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}
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stateStore := &smmocks.Store{}
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stateStore.On("LoadValidators", height).Return(conflictingVals, nil)
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stateStore.On("Load").Return(state, nil)
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blockStore := &mocks.BlockStore{}
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blockStore.On("LoadBlockMeta", height).Return(&types.BlockMeta{Header: *trustedHeader})
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blockStore.On("LoadBlockCommit", height).Return(trustedCommit)
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pool, err := evidence.NewPool(log.TestingLogger(), dbm.NewMemDB(), stateStore, blockStore)
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require.NoError(t, err)
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require.NoError(t, pool.AddEvidence(ev))
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require.NoError(t, pool.CheckEvidence(types.EvidenceList{ev}))
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// Take away the last signature -> there are less validators then what we have detected,
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// hence this should fail.
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commit.Signatures = append(commit.Signatures[:nValidators-1], types.NewCommitSigAbsent())
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require.Error(t, pool.CheckEvidence(types.EvidenceList{ev}))
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}
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// Tests that restarting the evidence pool after a potential failure will recover the
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// pending evidence and continue to gossip it
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func TestRecoverPendingEvidence(t *testing.T) {
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height := int64(10)
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val := types.NewMockPV()
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valAddress := val.PrivKey.PubKey().Address()
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evidenceDB := dbm.NewMemDB()
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stateStore := initializeValidatorState(t, val, height)
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state, err := stateStore.Load()
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require.NoError(t, err)
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blockStore := initializeBlockStore(dbm.NewMemDB(), state, valAddress)
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// create previous pool and populate it
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pool, err := evidence.NewPool(log.TestingLogger(), evidenceDB, stateStore, blockStore)
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require.NoError(t, err)
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goodEvidence := types.NewMockDuplicateVoteEvidenceWithValidator(
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height,
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defaultEvidenceTime.Add(10*time.Minute),
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val,
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evidenceChainID,
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)
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expiredEvidence := types.NewMockDuplicateVoteEvidenceWithValidator(
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int64(1),
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defaultEvidenceTime.Add(1*time.Minute),
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val,
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evidenceChainID,
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)
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require.NoError(t, pool.AddEvidence(goodEvidence))
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require.NoError(t, pool.AddEvidence(expiredEvidence))
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// now recover from the previous pool at a different time
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newStateStore := &smmocks.Store{}
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newStateStore.On("Load").Return(sm.State{
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LastBlockTime: defaultEvidenceTime.Add(25 * time.Minute),
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LastBlockHeight: height + 15,
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ConsensusParams: types.ConsensusParams{
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Block: types.BlockParams{
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MaxBytes: 22020096,
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MaxGas: -1,
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},
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Evidence: types.EvidenceParams{
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MaxAgeNumBlocks: 20,
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MaxAgeDuration: 20 * time.Minute,
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MaxBytes: 1000,
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},
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},
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}, nil)
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newPool, err := evidence.NewPool(log.TestingLogger(), evidenceDB, newStateStore, blockStore)
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require.NoError(t, err)
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evList, _ := newPool.PendingEvidence(defaultEvidenceMaxBytes)
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require.Equal(t, 1, len(evList))
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next := newPool.EvidenceFront()
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require.Equal(t, goodEvidence, next.Value.(types.Evidence))
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}
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func initializeStateFromValidatorSet(t *testing.T, valSet *types.ValidatorSet, height int64) sm.Store {
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stateDB := dbm.NewMemDB()
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stateStore := sm.NewStore(stateDB)
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state := sm.State{
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ChainID: evidenceChainID,
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InitialHeight: 1,
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LastBlockHeight: height,
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LastBlockTime: defaultEvidenceTime,
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Validators: valSet,
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NextValidators: valSet.CopyIncrementProposerPriority(1),
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LastValidators: valSet,
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LastHeightValidatorsChanged: 1,
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ConsensusParams: types.ConsensusParams{
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Block: types.BlockParams{
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MaxBytes: 22020096,
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MaxGas: -1,
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},
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Evidence: types.EvidenceParams{
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MaxAgeNumBlocks: 20,
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MaxAgeDuration: 20 * time.Minute,
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MaxBytes: 1000,
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},
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},
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}
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// save all states up to height
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for i := int64(0); i <= height; i++ {
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state.LastBlockHeight = i
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require.NoError(t, stateStore.Save(state))
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}
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return stateStore
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}
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func initializeValidatorState(t *testing.T, privVal types.PrivValidator, height int64) sm.Store {
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pubKey, _ := privVal.GetPubKey()
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validator := &types.Validator{Address: pubKey.Address(), VotingPower: 10, PubKey: pubKey}
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// create validator set and state
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valSet := &types.ValidatorSet{
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Validators: []*types.Validator{validator},
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Proposer: validator,
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}
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return initializeStateFromValidatorSet(t, valSet, height)
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}
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// initializeBlockStore creates a block storage and populates it w/ a dummy
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// block at +height+.
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func initializeBlockStore(db dbm.DB, state sm.State, valAddr []byte) *store.BlockStore {
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blockStore := store.NewBlockStore(db)
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for i := int64(1); i <= state.LastBlockHeight; i++ {
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lastCommit := makeCommit(i-1, valAddr)
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block, _ := state.MakeBlock(i, []types.Tx{}, lastCommit, nil,
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state.Validators.GetProposer().Address)
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block.Header.Time = defaultEvidenceTime.Add(time.Duration(i) * time.Minute)
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block.Header.Version = version.Consensus{Block: version.BlockProtocol, App: 1}
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const parts = 1
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partSet := block.MakePartSet(parts)
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seenCommit := makeCommit(i, valAddr)
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blockStore.SaveBlock(block, partSet, seenCommit)
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}
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return blockStore
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}
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func makeCommit(height int64, valAddr []byte) *types.Commit {
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commitSigs := []types.CommitSig{{
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BlockIDFlag: types.BlockIDFlagCommit,
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ValidatorAddress: valAddr,
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Timestamp: defaultEvidenceTime,
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Signature: []byte("Signature"),
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}}
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return types.NewCommit(height, 0, types.BlockID{}, commitSigs)
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}
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func defaultTestPool(t *testing.T, height int64) (*evidence.Pool, types.MockPV) {
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val := types.NewMockPV()
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valAddress := val.PrivKey.PubKey().Address()
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evidenceDB := dbm.NewMemDB()
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stateStore := initializeValidatorState(t, val, height)
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state, _ := stateStore.Load()
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blockStore := initializeBlockStore(dbm.NewMemDB(), state, valAddress)
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pool, err := evidence.NewPool(log.TestingLogger(), evidenceDB, stateStore, blockStore)
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require.NoError(t, err, "test evidence pool could not be created")
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return pool, val
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}
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func createState(height int64, valSet *types.ValidatorSet) sm.State {
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return sm.State{
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ChainID: evidenceChainID,
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LastBlockHeight: height,
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LastBlockTime: defaultEvidenceTime,
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Validators: valSet,
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ConsensusParams: *types.DefaultConsensusParams(),
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}
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}
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