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tendermint/light/client_test.go

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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 TestValidateTrustOptions(t *testing.T) {
testCases := []struct {
err bool
to light.TrustOptions
}{
{
false,
trustOptions,
},
{
true,
light.TrustOptions{
Period: -1 * time.Hour,
Height: 1,
Hash: h1.Hash(),
},
},
{
true,
light.TrustOptions{
Period: 1 * time.Hour,
Height: 0,
Hash: h1.Hash(),
},
},
{
true,
light.TrustOptions{
Period: 1 * time.Hour,
Height: 1,
Hash: []byte("incorrect hash"),
},
},
}
for _, tc := range testCases {
err := tc.to.ValidateBasic()
if tc.err {
assert.Error(t, err)
} else {
assert.NoError(t, err)
}
}
}
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
func TestClientLargeBisectionVerification(t *testing.T) {
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 TestClientBisectionBetweenTrustedHeaders(t *testing.T) {
c, err := light.NewClient(
chainID,
light.TrustOptions{
Period: 4 * time.Hour,
Height: 1,
Hash: h1.Hash(),
},
fullNode,
[]provider.Provider{fullNode},
dbs.New(dbm.NewMemDB(), chainID),
light.SkippingVerification(light.DefaultTrustLevel),
)
require.NoError(t, err)
_, err = c.VerifyHeaderAtHeight(3, bTime.Add(2*time.Hour))
require.NoError(t, err)
// confirm that the client already doesn't have the header
_, err = c.TrustedHeader(2)
require.Error(t, err)
// verify using bisection the header between the two trusted headers
_, err = c.VerifyHeaderAtHeight(2, bTime.Add(1*time.Hour))
assert.NoError(t, err)
}
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
{
// load the first three headers into the trusted store
trustedStore := dbs.New(dbm.NewMemDB(), chainID)
err := trustedStore.SaveSignedHeaderAndValidatorSet(h1, vals)
require.NoError(t, err)
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)
h, err = c.TrustedHeader(3)
assert.Error(t, err)
assert.Nil(t, h)
}
// 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)
// remaining withness doesn't have header -> error
_, err = c.VerifyHeaderAtHeight(3, bTime.Add(2*time.Hour))
if assert.Error(t, err) {
assert.Equal(t, "awaiting response from all witnesses exceeded dropout time", err.Error())
}
assert.EqualValues(t, 0, len(c.Witnesses()))
// no witnesses left, will not be allowed to verify a header
_, err = c.VerifyHeaderAtHeight(3, bTime.Add(2*time.Hour))
if assert.Error(t, err) {
assert.Equal(t, "no witnesses connected. please reset light client", err.Error())
}
}
func TestClientTrustedValidatorSet(t *testing.T) {
noValSetNode := mockp.New(
chainID,
headerSet,
map[int64]*types.ValidatorSet{
1: nil,
2: nil,
3: nil,
},
)
differentVals, _ := types.RandValidatorSet(10, 100)
badValSetNode := mockp.New(
chainID,
headerSet,
map[int64]*types.ValidatorSet{
1: vals,
2: differentVals,
3: differentVals,
},
)
c, err := light.NewClient(
chainID,
trustOptions,
noValSetNode,
[]provider.Provider{badValSetNode, fullNode, fullNode},
dbs.New(dbm.NewMemDB(), chainID),
light.Logger(log.TestingLogger()),
)
require.NoError(t, err)
assert.Equal(t, 2, len(c.Witnesses()))
_, err = c.VerifyHeaderAtHeight(2, bTime.Add(2*time.Hour).Add(1*time.Second))
assert.Error(t, err)
assert.Equal(t, 1, len(c.Witnesses()))
_, err = c.VerifyHeaderAtHeight(2, bTime.Add(2*time.Hour).Add(1*time.Second))
assert.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 TestClientPrunesHeadersAndValidatorSets(t *testing.T) {
c, err := light.NewClient(
chainID,
trustOptions,
fullNode,
[]provider.Provider{fullNode},
dbs.New(dbm.NewMemDB(), chainID),
light.Logger(log.TestingLogger()),
light.PruningSize(1),
)
require.NoError(t, err)
_, err = c.TrustedHeader(1)
require.NoError(t, err)
h, err := c.Update(bTime.Add(2 * time.Hour))
require.NoError(t, err)
require.Equal(t, int64(3), h.Height)
_, err = c.TrustedHeader(1)
assert.Error(t, err)
}
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)
}
}
}