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Merge pull request #3437 from nspcc-dev/fix-conflicts

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This commit is contained in:
Roman Khimov 2024-05-16 13:38:03 +03:00 committed by GitHub
commit 31a99d44eb
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5 changed files with 151 additions and 14 deletions
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9
pkg/core/blockchain.go
View file

@ -45,7 +45,7 @@ import (
// Tuning parameters.
const (
version = "0.2.11"
version = "0.2.12"
// DefaultInitialGAS is the default amount of GAS emitted to the standby validators
// multisignature account during native GAS contract initialization.
@ -1515,8 +1515,11 @@ func (bc *Blockchain) AddBlock(block *block.Block) error {
} else {
err = bc.verifyAndPoolTx(tx, mp, bc)
}
if err != nil && bc.config.VerifyTransactions {
return fmt.Errorf("transaction %s failed to verify: %w", tx.Hash().StringLE(), err)
if err != nil {
if bc.config.VerifyTransactions {
return fmt.Errorf("transaction %s failed to verify: %w", tx.Hash().StringLE(), err)
}
bc.log.Warn(fmt.Sprintf("transaction %s failed to verify: %s", tx.Hash().StringLE(), err))
}
}
}

39
pkg/core/blockchain_neotest_test.go
View file

@ -2494,3 +2494,42 @@ func TestNativenames(t *testing.T) {
require.Equal(t, cs.Manifest.Name, nativenames.All[i], i)
}
}
// TestBlockchain_StoreAsTransaction_ExecutableConflict ensures that transaction conflicting with
// some on-chain block can be properly stored and doesn't break the database.
func TestBlockchain_StoreAsTransaction_ExecutableConflict(t *testing.T) {
bc, acc := chain.NewSingleWithCustomConfig(t, nil)
e := neotest.NewExecutor(t, bc, acc, acc)
genesisH := bc.GetHeaderHash(0)
currHeight := bc.BlockHeight()
// Ensure AER can be retrieved for genesis block.
aer, err := bc.GetAppExecResults(genesisH, trigger.All)
require.NoError(t, err)
require.Equal(t, 2, len(aer))
tx := transaction.New([]byte{byte(opcode.PUSHT)}, 0)
tx.Nonce = 5
tx.ValidUntilBlock = e.Chain.BlockHeight() + 1
tx.Attributes = []transaction.Attribute{{Type: transaction.ConflictsT, Value: &transaction.Conflicts{Hash: genesisH}}}
e.SignTx(t, tx, -1, acc)
e.AddNewBlock(t, tx)
e.CheckHalt(t, tx.Hash(), stackitem.Make(true))
// Ensure original tx can be retrieved.
actual, actualHeight, err := bc.GetTransaction(tx.Hash())
require.NoError(t, err)
require.Equal(t, currHeight+1, actualHeight)
require.Equal(t, tx, actual, tx)
// Ensure conflict stub is not stored. This check doesn't give us 100% sure that
// there's no specific conflict record since GetTransaction doesn't return conflict records,
// but at least it allows to ensure that no transaction record is present.
_, _, err = bc.GetTransaction(genesisH)
require.ErrorIs(t, err, storage.ErrKeyNotFound)
// Ensure AER still can be retrieved for genesis block.
aer, err = bc.GetAppExecResults(genesisH, trigger.All)
require.NoError(t, err)
require.Equal(t, 2, len(aer))
}

43
pkg/core/dao/dao.go
View file

@ -35,6 +35,11 @@ var (
ErrInternalDBInconsistency = errors.New("internal DB inconsistency")
)
// conflictRecordValueLen is the length of value of transaction conflict record.
// It consists of 1-byte [storage.ExecTransaction] prefix and 4-bytes block index
// in the LE form.
const conflictRecordValueLen = 1 + 4
// Simple is memCached wrapper around DB, simple DAO implementation.
type Simple struct {
Version Version
@ -323,7 +328,7 @@ func (dao *Simple) GetTxExecResult(hash util.Uint256) (uint32, *transaction.Tran
// decodeTxAndExecResult decodes transaction, its height and execution result from
// the given executable bytes. It performs no executable prefix check.
func decodeTxAndExecResult(buf []byte) (uint32, *transaction.Transaction, *state.AppExecResult, error) {
if len(buf) >= 6 && buf[5] == transaction.DummyVersion {
if len(buf) == conflictRecordValueLen { // conflict record stub.
return 0, nil, nil, storage.ErrKeyNotFound
}
r := io.NewBinReaderFromBuf(buf)
@ -605,7 +610,7 @@ func (dao *Simple) DeleteHeaderHashes(since uint32, batchSize int) {
}
// GetTransaction returns Transaction and its height by the given hash
// if it exists in the store. It does not return dummy transactions.
// if it exists in the store. It does not return conflict record stubs.
func (dao *Simple) GetTransaction(hash util.Uint256) (*transaction.Transaction, uint32, error) {
key := dao.makeExecutableKey(hash)
b, err := dao.Store.Get(key)
@ -619,7 +624,7 @@ func (dao *Simple) GetTransaction(hash util.Uint256) (*transaction.Transaction,
// It may be a block.
return nil, 0, storage.ErrKeyNotFound
}
if len(b) == 1+4 { // storage.ExecTransaction + index
if len(b) == conflictRecordValueLen {
// It's a conflict record stub.
return nil, 0, storage.ErrKeyNotFound
}
@ -699,10 +704,16 @@ func (dao *Simple) HasTransaction(hash util.Uint256, signers []transaction.Signe
return nil
}
if len(bytes) < 5 { // (storage.ExecTransaction + index) for conflict record
if len(bytes) < conflictRecordValueLen { // (storage.ExecTransaction + index) for conflict record
return nil
}
if len(bytes) != 5 {
if bytes[0] != storage.ExecTransaction {
// It's a block, thus no conflict. This path is needed since there's a transaction accepted on mainnet
// that conflicts with block. This transaction was declined by Go nodes, but accepted by C# nodes, and hence
// we need to adjust Go behaviour post-factum. Ref. #3427 and 0x289c235dcdab8be7426d05f0fbb5e86c619f81481ea136493fa95deee5dbb7cc.
return nil
}
if len(bytes) != conflictRecordValueLen {
return ErrAlreadyExists // fully-qualified transaction
}
if len(signers) == 0 {
@ -778,6 +789,10 @@ func (dao *Simple) DeleteBlock(h util.Uint256) error {
if err != nil {
return fmt.Errorf("failed to retrieve conflict record stub for %s (height %d, conflict %s): %w", tx.Hash().StringLE(), b.Index, hash.StringLE(), err)
}
// It might be a block since we allow transactions to have block hash in the Conflicts attribute.
if v[0] != storage.ExecTransaction {
continue
}
index := binary.LittleEndian.Uint32(v[1:])
// We can check for `<=` here, but use equality comparison to be more precise
// and do not touch earlier conflict records (if any). Their removal must be triggered
@ -838,8 +853,9 @@ func (dao *Simple) StoreAsCurrentBlock(block *block.Block) {
dao.Store.Put(dao.mkKeyPrefix(storage.SYSCurrentBlock), buf.Bytes())
}
// StoreAsTransaction stores the given TX as DataTransaction. It also stores transactions
// the given tx has conflicts with as DataTransaction with dummy version. It can reuse the given
// StoreAsTransaction stores the given TX as DataTransaction. It also stores conflict records
// (hashes of transactions the given tx has conflicts with) as DataTransaction with value containing
// only five bytes: 1-byte [storage.ExecTransaction] executable prefix + 4-bytes-LE block index. It can reuse the given
// buffer for the purpose of value serialization.
func (dao *Simple) StoreAsTransaction(tx *transaction.Transaction, index uint32, aer *state.AppExecResult) error {
key := dao.makeExecutableKey(tx.Hash())
@ -857,12 +873,23 @@ func (dao *Simple) StoreAsTransaction(tx *transaction.Transaction, index uint32,
val := buf.Bytes()
dao.Store.Put(key, val)
val = val[:5] // storage.ExecTransaction (1 byte) + index (4 bytes)
val = val[:conflictRecordValueLen] // storage.ExecTransaction (1 byte) + index (4 bytes)
attrs := tx.GetAttributes(transaction.ConflictsT)
for _, attr := range attrs {
// Conflict record stub.
hash := attr.Value.(*transaction.Conflicts).Hash
copy(key[1:], hash.BytesBE())
// A short path if there's a block with the matching hash. If it's there, then
// don't store the conflict record stub and conflict signers since it's a
// useless record, no transaction with the same hash is possible.
exec, err := dao.Store.Get(key)
if err == nil {
if len(exec) > 0 && exec[0] != storage.ExecTransaction {
continue
}
}
dao.Store.Put(key, val)
// Conflicting signers.

70
pkg/core/dao/dao_test.go
View file

@ -242,6 +242,53 @@ func TestStoreAsTransaction(t *testing.T) {
}
err = dao.StoreAsTransaction(tx2, blockIndex, aer2)
require.NoError(t, err)
// A special transaction that conflicts with genesis block.
genesis := &block.Block{
Header: block.Header{
Version: 0,
Timestamp: 123,
Nonce: 1,
Index: 0,
NextConsensus: util.Uint160{1, 2, 3},
},
}
genesisAer1 := &state.AppExecResult{
Container: genesis.Hash(),
Execution: state.Execution{
Trigger: trigger.OnPersist,
Events: []state.NotificationEvent{},
Stack: []stackitem.Item{},
},
}
genesisAer2 := &state.AppExecResult{
Container: genesis.Hash(),
Execution: state.Execution{
Trigger: trigger.PostPersist,
Events: []state.NotificationEvent{},
Stack: []stackitem.Item{},
},
}
require.NoError(t, dao.StoreAsBlock(genesis, genesisAer1, genesisAer2))
tx3 := transaction.New([]byte{byte(opcode.PUSH1)}, 1)
tx3.Signers = append(tx3.Signers, transaction.Signer{Account: signer1})
tx3.Scripts = append(tx3.Scripts, transaction.Witness{})
tx3.Attributes = []transaction.Attribute{
{
Type: transaction.ConflictsT,
Value: &transaction.Conflicts{Hash: genesis.Hash()},
},
}
hash3 := tx3.Hash()
aer3 := &state.AppExecResult{
Container: hash3,
Execution: state.Execution{
Trigger: trigger.Application,
Events: []state.NotificationEvent{},
Stack: []stackitem.Item{},
},
}
err = dao.HasTransaction(hash1, nil, 0, 0)
require.ErrorIs(t, err, ErrAlreadyExists)
err = dao.HasTransaction(hash2, nil, 0, 0)
@ -280,6 +327,29 @@ func TestStoreAsTransaction(t *testing.T) {
require.NoError(t, err)
require.Equal(t, 1, len(gotAppExecResult))
require.Equal(t, *aer2, gotAppExecResult[0])
// Ensure block is not treated as transaction.
err = dao.HasTransaction(genesis.Hash(), nil, 0, 0)
require.NoError(t, err)
// Store tx3 and ensure genesis executable record is not corrupted.
require.NoError(t, dao.StoreAsTransaction(tx3, 0, aer3))
err = dao.HasTransaction(hash3, nil, 0, 0)
require.ErrorIs(t, err, ErrAlreadyExists)
actualAer, err := dao.GetAppExecResults(hash3, trigger.All)
require.NoError(t, err)
require.Equal(t, 1, len(actualAer))
require.Equal(t, *aer3, actualAer[0])
actualGenesisAer, err := dao.GetAppExecResults(genesis.Hash(), trigger.All)
require.NoError(t, err)
require.Equal(t, 2, len(actualGenesisAer))
require.Equal(t, *genesisAer1, actualGenesisAer[0])
require.Equal(t, *genesisAer2, actualGenesisAer[1])
// A special requirement for transactions that conflict with block: they should
// not produce conflict record stub, ref. #3427.
err = dao.HasTransaction(genesis.Hash(), nil, 0, 0)
require.NoError(t, err)
})
}

4
pkg/core/transaction/transaction.go
View file

@ -26,8 +26,6 @@ const (
// MaxAttributes is maximum number of attributes including signers that can be contained
// within a transaction. It is set to be 16.
MaxAttributes = 16
// DummyVersion represents reserved transaction version for trimmed transactions.
DummyVersion = 255
)
// ErrInvalidWitnessNum returns when the number of witnesses does not match signers.
@ -408,7 +406,7 @@ var (
// isValid checks whether decoded/unmarshalled transaction has all fields valid.
func (t *Transaction) isValid() error {
if t.Version > 0 && t.Version != DummyVersion {
if t.Version > 0 {
return ErrInvalidVersion
}
if t.SystemFee < 0 {