package light_test import ( "sync" "testing" "time" "github.com/stretchr/testify/assert" "github.com/stretchr/testify/require" dbm "github.com/tendermint/tm-db" "github.com/tendermint/tendermint/libs/log" "github.com/tendermint/tendermint/light" "github.com/tendermint/tendermint/light/provider" mockp "github.com/tendermint/tendermint/light/provider/mock" dbs "github.com/tendermint/tendermint/light/store/db" "github.com/tendermint/tendermint/types" ) const ( chainID = "test" ) var ( keys = genPrivKeys(4) vals = keys.ToValidators(20, 10) bTime, _ = time.Parse(time.RFC3339, "2006-01-02T15:04:05Z") h1 = keys.GenSignedHeader(chainID, 1, bTime, nil, vals, vals, hash("app_hash"), hash("cons_hash"), hash("results_hash"), 0, len(keys)) // 3/3 signed h2 = keys.GenSignedHeaderLastBlockID(chainID, 2, bTime.Add(30*time.Minute), nil, vals, vals, hash("app_hash"), hash("cons_hash"), hash("results_hash"), 0, len(keys), types.BlockID{Hash: h1.Hash()}) // 3/3 signed h3 = keys.GenSignedHeaderLastBlockID(chainID, 3, bTime.Add(1*time.Hour), nil, vals, vals, hash("app_hash"), hash("cons_hash"), hash("results_hash"), 0, len(keys), types.BlockID{Hash: h2.Hash()}) trustPeriod = 4 * time.Hour trustOptions = light.TrustOptions{ Period: 4 * time.Hour, Height: 1, Hash: h1.Hash(), } valSet = map[int64]*types.ValidatorSet{ 1: vals, 2: vals, 3: vals, 4: vals, } headerSet = map[int64]*types.SignedHeader{ 1: h1, // interim header (3/3 signed) 2: h2, // last header (3/3 signed) 3: h3, } fullNode = mockp.New( chainID, headerSet, valSet, ) deadNode = mockp.NewDeadMock(chainID) largeFullNode = mockp.New(GenMockNode(chainID, 10, 3, 0, bTime)) ) func TestClient_SequentialVerification(t *testing.T) { newKeys := genPrivKeys(4) newVals := newKeys.ToValidators(10, 1) testCases := []struct { name string otherHeaders map[int64]*types.SignedHeader // all except ^ vals map[int64]*types.ValidatorSet initErr bool verifyErr bool }{ { "good", headerSet, valSet, false, false, }, { "bad: different first header", map[int64]*types.SignedHeader{ // different header 1: keys.GenSignedHeader(chainID, 1, bTime.Add(1*time.Hour), nil, vals, vals, hash("app_hash"), hash("cons_hash"), hash("results_hash"), 0, len(keys)), }, map[int64]*types.ValidatorSet{ 1: vals, }, true, false, }, { "bad: 1/3 signed interim header", map[int64]*types.SignedHeader{ // trusted header 1: h1, // interim header (1/3 signed) 2: keys.GenSignedHeader(chainID, 2, bTime.Add(1*time.Hour), nil, vals, vals, hash("app_hash"), hash("cons_hash"), hash("results_hash"), len(keys)-1, len(keys)), // last header (3/3 signed) 3: keys.GenSignedHeader(chainID, 3, bTime.Add(2*time.Hour), nil, vals, vals, hash("app_hash"), hash("cons_hash"), hash("results_hash"), 0, len(keys)), }, valSet, false, true, }, { "bad: 1/3 signed last header", map[int64]*types.SignedHeader{ // trusted header 1: h1, // interim header (3/3 signed) 2: keys.GenSignedHeader(chainID, 2, bTime.Add(1*time.Hour), nil, vals, vals, hash("app_hash"), hash("cons_hash"), hash("results_hash"), 0, len(keys)), // last header (1/3 signed) 3: keys.GenSignedHeader(chainID, 3, bTime.Add(2*time.Hour), nil, vals, vals, hash("app_hash"), hash("cons_hash"), hash("results_hash"), len(keys)-1, len(keys)), }, valSet, false, true, }, { "bad: different validator set at height 3", headerSet, map[int64]*types.ValidatorSet{ 1: vals, 2: vals, 3: newVals, }, false, true, }, } for _, tc := range testCases { tc := tc t.Run(tc.name, func(t *testing.T) { c, err := light.NewClient( chainID, trustOptions, mockp.New( chainID, tc.otherHeaders, tc.vals, ), []provider.Provider{mockp.New( chainID, tc.otherHeaders, tc.vals, )}, dbs.New(dbm.NewMemDB(), chainID), light.SequentialVerification(), ) if tc.initErr { require.Error(t, err) return } require.NoError(t, err) _, err = c.VerifyHeaderAtHeight(3, bTime.Add(3*time.Hour)) if tc.verifyErr { assert.Error(t, err) } else { assert.NoError(t, err) } }) } } func TestClient_SkippingVerification(t *testing.T) { // required for 2nd test case newKeys := genPrivKeys(4) newVals := newKeys.ToValidators(10, 1) // 1/3+ of vals, 2/3- of newVals transitKeys := keys.Extend(3) transitVals := transitKeys.ToValidators(10, 1) testCases := []struct { name string otherHeaders map[int64]*types.SignedHeader // all except ^ vals map[int64]*types.ValidatorSet initErr bool verifyErr bool }{ { "good", map[int64]*types.SignedHeader{ // trusted header 1: h1, // last header (3/3 signed) 3: h3, }, valSet, false, false, }, { "good, but val set changes by 2/3 (1/3 of vals is still present)", map[int64]*types.SignedHeader{ // trusted header 1: h1, 3: transitKeys.GenSignedHeader(chainID, 3, bTime.Add(2*time.Hour), nil, transitVals, transitVals, hash("app_hash"), hash("cons_hash"), hash("results_hash"), 0, len(transitKeys)), }, map[int64]*types.ValidatorSet{ 1: vals, 2: vals, 3: transitVals, }, false, false, }, { "good, but val set changes 100% at height 2", map[int64]*types.SignedHeader{ // trusted header 1: h1, // interim header (3/3 signed) 2: keys.GenSignedHeader(chainID, 2, bTime.Add(1*time.Hour), nil, vals, newVals, hash("app_hash"), hash("cons_hash"), hash("results_hash"), 0, len(keys)), // last header (0/4 of the original val set signed) 3: newKeys.GenSignedHeader(chainID, 3, bTime.Add(2*time.Hour), nil, newVals, newVals, hash("app_hash"), hash("cons_hash"), hash("results_hash"), 0, len(newKeys)), }, map[int64]*types.ValidatorSet{ 1: vals, 2: vals, 3: newVals, }, false, false, }, { "bad: last header signed by newVals, interim header has no signers", map[int64]*types.SignedHeader{ // trusted header 1: h1, // last header (0/4 of the original val set signed) 2: keys.GenSignedHeader(chainID, 2, bTime.Add(1*time.Hour), nil, vals, newVals, hash("app_hash"), hash("cons_hash"), hash("results_hash"), 0, 0), // last header (0/4 of the original val set signed) 3: newKeys.GenSignedHeader(chainID, 3, bTime.Add(2*time.Hour), nil, newVals, newVals, hash("app_hash"), hash("cons_hash"), hash("results_hash"), 0, len(newKeys)), }, map[int64]*types.ValidatorSet{ 1: vals, 2: vals, 3: newVals, }, false, true, }, } for _, tc := range testCases { tc := tc t.Run(tc.name, func(t *testing.T) { c, err := light.NewClient( chainID, trustOptions, mockp.New( chainID, tc.otherHeaders, tc.vals, ), []provider.Provider{mockp.New( chainID, tc.otherHeaders, tc.vals, )}, dbs.New(dbm.NewMemDB(), chainID), light.SkippingVerification(light.DefaultTrustLevel), ) if tc.initErr { require.Error(t, err) return } require.NoError(t, err) _, err = c.VerifyHeaderAtHeight(3, bTime.Add(3*time.Hour)) if tc.verifyErr { assert.Error(t, err) } else { assert.NoError(t, err) } }) } // start from a large header to make sure that the pivot height doesn't select a height outside // the appropriate range veryLargeFullNode := mockp.New(GenMockNode(chainID, 100, 3, 1, bTime)) h1, err := veryLargeFullNode.SignedHeader(90) require.NoError(t, err) c, err := light.NewClient( chainID, light.TrustOptions{ Period: 4 * time.Hour, Height: 90, Hash: h1.Hash(), }, veryLargeFullNode, []provider.Provider{veryLargeFullNode}, dbs.New(dbm.NewMemDB(), chainID), light.SkippingVerification(light.DefaultTrustLevel), ) require.NoError(t, err) h, err := c.Update(bTime.Add(100 * time.Minute)) assert.NoError(t, err) h2, err := veryLargeFullNode.SignedHeader(100) require.NoError(t, err) assert.Equal(t, h, h2) } func TestClient_Cleanup(t *testing.T) { c, err := light.NewClient( chainID, trustOptions, fullNode, []provider.Provider{fullNode}, dbs.New(dbm.NewMemDB(), chainID), light.Logger(log.TestingLogger()), ) require.NoError(t, err) _, err = c.TrustedHeader(1) require.NoError(t, err) err = c.Cleanup() require.NoError(t, err) // Check no headers/valsets exist after Cleanup. h, err := c.TrustedHeader(1) assert.Error(t, err) assert.Nil(t, h) valSet, _, err := c.TrustedValidatorSet(1) assert.Error(t, err) assert.Nil(t, valSet) } // trustedHeader.Height == options.Height func TestClientRestoresTrustedHeaderAfterStartup1(t *testing.T) { // 1. options.Hash == trustedHeader.Hash { trustedStore := dbs.New(dbm.NewMemDB(), chainID) err := trustedStore.SaveSignedHeaderAndValidatorSet(h1, vals) require.NoError(t, err) c, err := light.NewClient( chainID, trustOptions, fullNode, []provider.Provider{fullNode}, trustedStore, light.Logger(log.TestingLogger()), ) require.NoError(t, err) h, err := c.TrustedHeader(1) assert.NoError(t, err) assert.NotNil(t, h) assert.Equal(t, h.Hash(), h1.Hash()) valSet, _, err := c.TrustedValidatorSet(1) assert.NoError(t, err) assert.NotNil(t, valSet) if assert.NotNil(t, valSet) { assert.Equal(t, h.ValidatorsHash.Bytes(), valSet.Hash()) } } // 2. options.Hash != trustedHeader.Hash { trustedStore := dbs.New(dbm.NewMemDB(), chainID) err := trustedStore.SaveSignedHeaderAndValidatorSet(h1, vals) require.NoError(t, err) // header1 != header header1 := keys.GenSignedHeader(chainID, 1, bTime.Add(1*time.Hour), nil, vals, vals, hash("app_hash"), hash("cons_hash"), hash("results_hash"), 0, len(keys)) primary := mockp.New( chainID, map[int64]*types.SignedHeader{ // trusted header 1: header1, }, valSet, ) c, err := light.NewClient( chainID, light.TrustOptions{ Period: 4 * time.Hour, Height: 1, Hash: header1.Hash(), }, primary, []provider.Provider{primary}, trustedStore, light.Logger(log.TestingLogger()), ) require.NoError(t, err) h, err := c.TrustedHeader(1) assert.NoError(t, err) if assert.NotNil(t, h) { assert.Equal(t, h.Hash(), header1.Hash()) } valSet, _, err := c.TrustedValidatorSet(1) assert.NoError(t, err) assert.NotNil(t, valSet) if assert.NotNil(t, valSet) { assert.Equal(t, h.ValidatorsHash.Bytes(), valSet.Hash()) } } } // trustedHeader.Height < options.Height func TestClientRestoresTrustedHeaderAfterStartup2(t *testing.T) { // 1. options.Hash == trustedHeader.Hash { trustedStore := dbs.New(dbm.NewMemDB(), chainID) err := trustedStore.SaveSignedHeaderAndValidatorSet(h1, vals) require.NoError(t, err) c, err := light.NewClient( chainID, light.TrustOptions{ Period: 4 * time.Hour, Height: 2, Hash: h2.Hash(), }, fullNode, []provider.Provider{fullNode}, trustedStore, light.Logger(log.TestingLogger()), ) require.NoError(t, err) // Check we still have the 1st header (+header+). h, err := c.TrustedHeader(1) assert.NoError(t, err) assert.NotNil(t, h) assert.Equal(t, h.Hash(), h1.Hash()) valSet, _, err := c.TrustedValidatorSet(1) assert.NoError(t, err) assert.NotNil(t, valSet) if assert.NotNil(t, valSet) { assert.Equal(t, h.ValidatorsHash.Bytes(), valSet.Hash()) } } // 2. options.Hash != trustedHeader.Hash // This could happen if previous provider was lying to us. { trustedStore := dbs.New(dbm.NewMemDB(), chainID) err := trustedStore.SaveSignedHeaderAndValidatorSet(h1, vals) require.NoError(t, err) // header1 != header diffHeader1 := keys.GenSignedHeader(chainID, 1, bTime.Add(1*time.Hour), nil, vals, vals, hash("app_hash"), hash("cons_hash"), hash("results_hash"), 0, len(keys)) diffHeader2 := keys.GenSignedHeader(chainID, 2, bTime.Add(2*time.Hour), nil, vals, vals, hash("app_hash"), hash("cons_hash"), hash("results_hash"), 0, len(keys)) primary := mockp.New( chainID, map[int64]*types.SignedHeader{ 1: diffHeader1, 2: diffHeader2, }, valSet, ) c, err := light.NewClient( chainID, light.TrustOptions{ Period: 4 * time.Hour, Height: 2, Hash: diffHeader2.Hash(), }, primary, []provider.Provider{primary}, trustedStore, light.Logger(log.TestingLogger()), ) require.NoError(t, err) // Check we no longer have the invalid 1st header (+header+). h, err := c.TrustedHeader(1) assert.Error(t, err) assert.Nil(t, h) valSet, _, err := c.TrustedValidatorSet(1) assert.Error(t, err) assert.Nil(t, valSet) } } // trustedHeader.Height > options.Height func TestClientRestoresTrustedHeaderAfterStartup3(t *testing.T) { // 1. options.Hash == trustedHeader.Hash { trustedStore := dbs.New(dbm.NewMemDB(), chainID) err := trustedStore.SaveSignedHeaderAndValidatorSet(h1, vals) require.NoError(t, err) //header2 := keys.GenSignedHeader(chainID, 2, bTime.Add(2*time.Hour), nil, vals, vals, // []byte("app_hash"), []byte("cons_hash"), []byte("results_hash"), 0, len(keys)) err = trustedStore.SaveSignedHeaderAndValidatorSet(h2, vals) require.NoError(t, err) c, err := light.NewClient( chainID, trustOptions, fullNode, []provider.Provider{fullNode}, trustedStore, light.Logger(log.TestingLogger()), ) require.NoError(t, err) // Check we still have the 1st header (+header+). h, err := c.TrustedHeader(1) assert.NoError(t, err) assert.NotNil(t, h) assert.Equal(t, h.Hash(), h1.Hash()) valSet, _, err := c.TrustedValidatorSet(1) assert.NoError(t, err) assert.NotNil(t, valSet) if assert.NotNil(t, valSet) { assert.Equal(t, h.ValidatorsHash.Bytes(), valSet.Hash()) } // Check we no longer have 2nd header (+header2+). h, err = c.TrustedHeader(2) assert.Error(t, err) assert.Nil(t, h) valSet, _, err = c.TrustedValidatorSet(2) assert.Error(t, err) assert.Nil(t, valSet) } // 2. options.Hash != trustedHeader.Hash // This could happen if previous provider was lying to us. { trustedStore := dbs.New(dbm.NewMemDB(), chainID) err := trustedStore.SaveSignedHeaderAndValidatorSet(h1, vals) require.NoError(t, err) // header1 != header header1 := keys.GenSignedHeader(chainID, 1, bTime.Add(1*time.Hour), nil, vals, vals, hash("app_hash"), hash("cons_hash"), hash("results_hash"), 0, len(keys)) header2 := keys.GenSignedHeader(chainID, 2, bTime.Add(2*time.Hour), nil, vals, vals, hash("app_hash"), hash("cons_hash"), hash("results_hash"), 0, len(keys)) err = trustedStore.SaveSignedHeaderAndValidatorSet(header2, vals) require.NoError(t, err) primary := mockp.New( chainID, map[int64]*types.SignedHeader{ 1: header1, }, valSet, ) c, err := light.NewClient( chainID, light.TrustOptions{ Period: 4 * time.Hour, Height: 1, Hash: header1.Hash(), }, primary, []provider.Provider{primary}, trustedStore, light.Logger(log.TestingLogger()), ) require.NoError(t, err) // Check we have swapped invalid 1st header (+header+) with correct one (+header1+). h, err := c.TrustedHeader(1) assert.NoError(t, err) assert.NotNil(t, h) assert.Equal(t, h.Hash(), header1.Hash()) valSet, _, err := c.TrustedValidatorSet(1) assert.NoError(t, err) assert.NotNil(t, valSet) if assert.NotNil(t, valSet) { assert.Equal(t, h.ValidatorsHash.Bytes(), valSet.Hash()) } // Check we no longer have invalid 2nd header (+header2+). h, err = c.TrustedHeader(2) assert.Error(t, err) assert.Nil(t, h) valSet, _, err = c.TrustedValidatorSet(2) assert.Error(t, err) assert.Nil(t, valSet) } } func TestClient_Update(t *testing.T) { c, err := light.NewClient( chainID, trustOptions, fullNode, []provider.Provider{fullNode}, dbs.New(dbm.NewMemDB(), chainID), light.Logger(log.TestingLogger()), ) require.NoError(t, err) // should result in downloading & verifying header #3 h, err := c.Update(bTime.Add(2 * time.Hour)) assert.NoError(t, err) if assert.NotNil(t, h) { assert.EqualValues(t, 3, h.Height) } valSet, _, err := c.TrustedValidatorSet(3) assert.NoError(t, err) if assert.NotNil(t, valSet) { assert.Equal(t, h.ValidatorsHash.Bytes(), valSet.Hash()) } } func TestClient_Concurrency(t *testing.T) { c, err := light.NewClient( chainID, trustOptions, fullNode, []provider.Provider{fullNode}, dbs.New(dbm.NewMemDB(), chainID), light.Logger(log.TestingLogger()), ) require.NoError(t, err) _, err = c.VerifyHeaderAtHeight(2, bTime.Add(2*time.Hour)) require.NoError(t, err) var wg sync.WaitGroup for i := 0; i < 100; i++ { wg.Add(1) go func() { defer wg.Done() // NOTE: Cleanup, Stop, VerifyHeaderAtHeight and Verify are not supposed // to be concurrenly safe. assert.Equal(t, chainID, c.ChainID()) _, err := c.LastTrustedHeight() assert.NoError(t, err) _, err = c.FirstTrustedHeight() assert.NoError(t, err) h, err := c.TrustedHeader(1) assert.NoError(t, err) assert.NotNil(t, h) vals, _, err := c.TrustedValidatorSet(2) assert.NoError(t, err) assert.NotNil(t, vals) }() } wg.Wait() } func TestClientReplacesPrimaryWithWitnessIfPrimaryIsUnavailable(t *testing.T) { c, err := light.NewClient( chainID, trustOptions, deadNode, []provider.Provider{fullNode, fullNode}, dbs.New(dbm.NewMemDB(), chainID), light.Logger(log.TestingLogger()), light.MaxRetryAttempts(1), ) require.NoError(t, err) _, err = c.Update(bTime.Add(2 * time.Hour)) require.NoError(t, err) assert.NotEqual(t, c.Primary(), deadNode) assert.Equal(t, 1, len(c.Witnesses())) } func TestClient_BackwardsVerification(t *testing.T) { { trustHeader, _ := largeFullNode.SignedHeader(6) c, err := light.NewClient( chainID, light.TrustOptions{ Period: 4 * time.Minute, Height: trustHeader.Height, Hash: trustHeader.Hash(), }, largeFullNode, []provider.Provider{largeFullNode}, dbs.New(dbm.NewMemDB(), chainID), light.Logger(log.TestingLogger()), ) require.NoError(t, err) // 1) verify before the trusted header using backwards => expect no error h, err := c.VerifyHeaderAtHeight(5, bTime.Add(6*time.Minute)) require.NoError(t, err) if assert.NotNil(t, h) { assert.EqualValues(t, 5, h.Height) } // 2) untrusted header is expired but trusted header is not => expect no error h, err = c.VerifyHeaderAtHeight(3, bTime.Add(8*time.Minute)) assert.NoError(t, err) assert.NotNil(t, h) // 3) already stored headers should return the header without error h, err = c.VerifyHeaderAtHeight(5, bTime.Add(6*time.Minute)) assert.NoError(t, err) assert.NotNil(t, h) // 4a) First verify latest header _, err = c.VerifyHeaderAtHeight(9, bTime.Add(9*time.Minute)) require.NoError(t, err) // 4b) Verify backwards using bisection => expect no error _, err = c.VerifyHeaderAtHeight(7, bTime.Add(10*time.Minute)) assert.NoError(t, err) // shouldn't have verified this header in the process _, err = c.TrustedHeader(8) assert.Error(t, err) // 5) trusted header has expired => expect error _, err = c.VerifyHeaderAtHeight(1, bTime.Add(20*time.Minute)) assert.Error(t, err) // 6) Try bisection method, but closest header (at 7) has expired // so change to backwards => expect no error _, err = c.VerifyHeaderAtHeight(8, bTime.Add(12*time.Minute)) assert.NoError(t, err) } { testCases := []struct { provider provider.Provider }{ { // 7) provides incorrect height mockp.New( chainID, map[int64]*types.SignedHeader{ 1: h1, 2: keys.GenSignedHeader(chainID, 1, bTime.Add(1*time.Hour), nil, vals, vals, hash("app_hash"), hash("cons_hash"), hash("results_hash"), 0, len(keys)), 3: h3, }, valSet, ), }, { // 8) provides incorrect hash mockp.New( chainID, map[int64]*types.SignedHeader{ 1: h1, 2: keys.GenSignedHeader(chainID, 2, bTime.Add(30*time.Minute), nil, vals, vals, hash("app_hash"), hash("cons_hash"), hash("results_hash"), 0, len(keys)), 3: h3, }, valSet, ), }, } for _, tc := range testCases { c, err := light.NewClient( chainID, light.TrustOptions{ Period: 1 * time.Hour, Height: 3, Hash: h3.Hash(), }, tc.provider, []provider.Provider{tc.provider}, dbs.New(dbm.NewMemDB(), chainID), light.Logger(log.TestingLogger()), ) require.NoError(t, err) _, err = c.VerifyHeaderAtHeight(2, bTime.Add(1*time.Hour).Add(1*time.Second)) assert.Error(t, err) } } } func TestClient_NewClientFromTrustedStore(t *testing.T) { // 1) Initiate DB and fill with a "trusted" header db := dbs.New(dbm.NewMemDB(), chainID) err := db.SaveSignedHeaderAndValidatorSet(h1, vals) require.NoError(t, err) c, err := light.NewClientFromTrustedStore( chainID, trustPeriod, deadNode, []provider.Provider{deadNode}, db, ) require.NoError(t, err) // 2) Check header exists (deadNode is being used to ensure we're not getting // it from primary) h, err := c.TrustedHeader(1) assert.NoError(t, err) assert.EqualValues(t, 1, h.Height) valSet, _, err := c.TrustedValidatorSet(1) assert.NoError(t, err) assert.NotNil(t, valSet) if assert.NotNil(t, valSet) { assert.Equal(t, h.ValidatorsHash.Bytes(), valSet.Hash()) } } func TestNewClientErrorsIfAllWitnessesUnavailable(t *testing.T) { _, err := light.NewClient( chainID, trustOptions, fullNode, []provider.Provider{deadNode, deadNode}, dbs.New(dbm.NewMemDB(), chainID), light.Logger(log.TestingLogger()), light.MaxRetryAttempts(1), ) if assert.Error(t, err) { assert.Contains(t, err.Error(), "awaiting response from all witnesses exceeded dropout time") } } func TestClientRemovesWitnessIfItSendsUsIncorrectHeader(t *testing.T) { // different headers hash then primary plus less than 1/3 signed (no fork) badProvider1 := mockp.New( chainID, map[int64]*types.SignedHeader{ 1: h1, 2: keys.GenSignedHeaderLastBlockID(chainID, 2, bTime.Add(30*time.Minute), nil, vals, vals, hash("app_hash2"), hash("cons_hash"), hash("results_hash"), len(keys), len(keys), types.BlockID{Hash: h1.Hash()}), }, map[int64]*types.ValidatorSet{ 1: vals, 2: vals, }, ) // header is empty badProvider2 := mockp.New( chainID, map[int64]*types.SignedHeader{ 1: h1, 2: h2, 3: {Header: nil, Commit: nil}, }, map[int64]*types.ValidatorSet{ 1: vals, 2: vals, }, ) c, err := light.NewClient( chainID, trustOptions, fullNode, []provider.Provider{badProvider1, badProvider2}, dbs.New(dbm.NewMemDB(), chainID), light.Logger(log.TestingLogger()), light.MaxRetryAttempts(1), ) // witness should have behaved properly -> no error require.NoError(t, err) assert.EqualValues(t, 2, len(c.Witnesses())) // witness behaves incorrectly -> removed from list, no error h, err := c.VerifyHeaderAtHeight(2, bTime.Add(2*time.Hour)) assert.NoError(t, err) assert.EqualValues(t, 1, len(c.Witnesses())) // header should still be verified assert.EqualValues(t, 2, h.Height) // no witnesses left to verify -> error _, err = c.VerifyHeaderAtHeight(3, bTime.Add(2*time.Hour)) assert.Error(t, err) assert.EqualValues(t, 0, len(c.Witnesses())) } func TestClientTrustedValidatorSet(t *testing.T) { c, err := light.NewClient( chainID, trustOptions, fullNode, []provider.Provider{fullNode}, dbs.New(dbm.NewMemDB(), chainID), light.Logger(log.TestingLogger()), ) require.NoError(t, err) _, err = c.VerifyHeaderAtHeight(2, bTime.Add(2*time.Hour).Add(1*time.Second)) require.NoError(t, err) valSet, height, err := c.TrustedValidatorSet(0) assert.NoError(t, err) assert.NotNil(t, valSet) assert.EqualValues(t, 2, height) } func TestClientReportsConflictingHeadersEvidence(t *testing.T) { // fullNode2 sends us different header altH2 := keys.GenSignedHeaderLastBlockID(chainID, 2, bTime.Add(30*time.Minute), nil, vals, vals, hash("app_hash2"), hash("cons_hash"), hash("results_hash"), 0, len(keys), types.BlockID{Hash: h1.Hash()}) fullNode2 := mockp.New( chainID, map[int64]*types.SignedHeader{ 1: h1, 2: altH2, }, map[int64]*types.ValidatorSet{ 1: vals, 2: vals, }, ) c, err := light.NewClient( chainID, trustOptions, fullNode, []provider.Provider{fullNode2}, dbs.New(dbm.NewMemDB(), chainID), light.Logger(log.TestingLogger()), light.MaxRetryAttempts(1), ) require.NoError(t, err) // Check verification returns an error. _, err = c.VerifyHeaderAtHeight(2, bTime.Add(2*time.Hour)) if assert.Error(t, err) { assert.Contains(t, err.Error(), "does not match one") } // Check evidence was sent to both full nodes. ev := types.ConflictingHeadersEvidence{H1: h2, H2: altH2} assert.True(t, fullNode2.HasEvidence(ev)) assert.True(t, fullNode.HasEvidence(ev)) } func TestClientEnsureValidHeadersAndValSets(t *testing.T) { emptyValSet := &types.ValidatorSet{ Validators: nil, Proposer: nil, } testCases := []struct { headers map[int64]*types.SignedHeader vals map[int64]*types.ValidatorSet err bool }{ { headerSet, valSet, false, }, { headerSet, map[int64]*types.ValidatorSet{ 1: vals, 2: vals, 3: nil, }, true, }, { map[int64]*types.SignedHeader{ 1: h1, 2: h2, 3: nil, }, valSet, true, }, { headerSet, map[int64]*types.ValidatorSet{ 1: vals, 2: vals, 3: emptyValSet, }, true, }, } for _, tc := range testCases { badNode := mockp.New( chainID, tc.headers, tc.vals, ) c, err := light.NewClient( chainID, trustOptions, badNode, []provider.Provider{badNode, badNode}, dbs.New(dbm.NewMemDB(), chainID), light.MaxRetryAttempts(1), ) require.NoError(t, err) _, err = c.VerifyHeaderAtHeight(3, bTime.Add(2*time.Hour)) if tc.err { assert.Error(t, err) } else { assert.NoError(t, err) } } }