neoneo-go/pkg/core/dao/dao.go
2022-01-13 12:44:29 +03:00

742 lines
23 KiB
Go

package dao
import (
"bytes"
"context"
"encoding/binary"
"errors"
"fmt"
iocore "io"
"sort"
"github.com/nspcc-dev/neo-go/pkg/core/block"
"github.com/nspcc-dev/neo-go/pkg/core/mpt"
"github.com/nspcc-dev/neo-go/pkg/core/state"
"github.com/nspcc-dev/neo-go/pkg/core/storage"
"github.com/nspcc-dev/neo-go/pkg/core/transaction"
"github.com/nspcc-dev/neo-go/pkg/io"
"github.com/nspcc-dev/neo-go/pkg/smartcontract/trigger"
"github.com/nspcc-dev/neo-go/pkg/util"
)
// HasTransaction errors.
var (
// ErrAlreadyExists is returned when transaction exists in dao.
ErrAlreadyExists = errors.New("transaction already exists")
// ErrHasConflicts is returned when transaction is in the list of conflicting
// transactions which are already in dao.
ErrHasConflicts = errors.New("transaction has conflicts")
)
// DAO is a data access object.
type DAO interface {
DeleteBlock(h util.Uint256, buf *io.BufBinWriter) error
DeleteContractID(id int32) error
DeleteStorageItem(id int32, key []byte) error
GetAndDecode(entity io.Serializable, key []byte) error
GetAppExecResults(hash util.Uint256, trig trigger.Type) ([]state.AppExecResult, error)
GetBatch() *storage.MemBatch
GetBlock(hash util.Uint256) (*block.Block, error)
GetContractScriptHash(id int32) (util.Uint160, error)
GetCurrentBlockHeight() (uint32, error)
GetCurrentHeaderHeight() (i uint32, h util.Uint256, err error)
GetHeaderHashes() ([]util.Uint256, error)
GetTokenTransferInfo(acc util.Uint160) (*state.TokenTransferInfo, error)
GetTokenTransferLog(acc util.Uint160, index uint32, isNEP11 bool) (*state.TokenTransferLog, error)
GetStateSyncPoint() (uint32, error)
GetStateSyncCurrentBlockHeight() (uint32, error)
GetStorageItem(id int32, key []byte) state.StorageItem
GetStorageItems(id int32) ([]state.StorageItemWithKey, error)
GetStorageItemsWithPrefix(id int32, prefix []byte) ([]state.StorageItemWithKey, error)
GetTransaction(hash util.Uint256) (*transaction.Transaction, uint32, error)
GetVersion() (Version, error)
GetWrapped() DAO
HasTransaction(hash util.Uint256) error
Persist() (int, error)
PersistSync() (int, error)
PutContractID(id int32, hash util.Uint160) error
PutCurrentHeader(hashAndIndex []byte) error
PutTokenTransferInfo(acc util.Uint160, bs *state.TokenTransferInfo) error
PutTokenTransferLog(acc util.Uint160, index uint32, isNEP11 bool, lg *state.TokenTransferLog) error
PutStateSyncPoint(p uint32) error
PutStateSyncCurrentBlockHeight(h uint32) error
PutStorageItem(id int32, key []byte, si state.StorageItem) error
PutVersion(v Version) error
Seek(id int32, rng storage.SeekRange, f func(k, v []byte))
SeekAsync(ctx context.Context, id int32, rng storage.SeekRange) chan storage.KeyValue
StoreAsBlock(block *block.Block, aer1 *state.AppExecResult, aer2 *state.AppExecResult, buf *io.BufBinWriter) error
StoreAsCurrentBlock(block *block.Block, buf *io.BufBinWriter) error
StoreAsTransaction(tx *transaction.Transaction, index uint32, aer *state.AppExecResult, buf *io.BufBinWriter) error
putTokenTransferInfo(acc util.Uint160, bs *state.TokenTransferInfo, buf *io.BufBinWriter) error
}
// Simple is memCached wrapper around DB, simple DAO implementation.
type Simple struct {
Version Version
Store *storage.MemCachedStore
}
// NewSimple creates new simple dao using provided backend store.
func NewSimple(backend storage.Store, stateRootInHeader bool, p2pSigExtensions bool) *Simple {
st := storage.NewMemCachedStore(backend)
return &Simple{
Version: Version{
StoragePrefix: storage.STStorage,
StateRootInHeader: stateRootInHeader,
P2PSigExtensions: p2pSigExtensions,
},
Store: st,
}
}
// GetBatch returns currently accumulated DB changeset.
func (dao *Simple) GetBatch() *storage.MemBatch {
return dao.Store.GetBatch()
}
// GetWrapped returns new DAO instance with another layer of wrapped
// MemCachedStore around the current DAO Store.
func (dao *Simple) GetWrapped() DAO {
d := NewSimple(dao.Store, dao.Version.StateRootInHeader, dao.Version.P2PSigExtensions)
d.Version = dao.Version
return d
}
// GetAndDecode performs get operation and decoding with serializable structures.
func (dao *Simple) GetAndDecode(entity io.Serializable, key []byte) error {
entityBytes, err := dao.Store.Get(key)
if err != nil {
return err
}
reader := io.NewBinReaderFromBuf(entityBytes)
entity.DecodeBinary(reader)
return reader.Err
}
// Put performs put operation with serializable structures.
func (dao *Simple) Put(entity io.Serializable, key []byte) error {
return dao.putWithBuffer(entity, key, io.NewBufBinWriter())
}
// putWithBuffer performs put operation using buf as a pre-allocated buffer for serialization.
func (dao *Simple) putWithBuffer(entity io.Serializable, key []byte, buf *io.BufBinWriter) error {
entity.EncodeBinary(buf.BinWriter)
if buf.Err != nil {
return buf.Err
}
return dao.Store.Put(key, buf.Bytes())
}
func makeContractIDKey(id int32) []byte {
key := make([]byte, 5)
key[0] = byte(storage.STContractID)
binary.LittleEndian.PutUint32(key[1:], uint32(id))
return key
}
// DeleteContractID deletes contract's id to hash mapping.
func (dao *Simple) DeleteContractID(id int32) error {
return dao.Store.Delete(makeContractIDKey(id))
}
// PutContractID adds a mapping from contract's ID to its hash.
func (dao *Simple) PutContractID(id int32, hash util.Uint160) error {
return dao.Store.Put(makeContractIDKey(id), hash.BytesBE())
}
// GetContractScriptHash retrieves contract's hash given its ID.
func (dao *Simple) GetContractScriptHash(id int32) (util.Uint160, error) {
var data = new(util.Uint160)
if err := dao.GetAndDecode(data, makeContractIDKey(id)); err != nil {
return *data, err
}
return *data, nil
}
// -- start NEP-17 transfer info.
// GetTokenTransferInfo retrieves NEP-17 transfer info from the cache.
func (dao *Simple) GetTokenTransferInfo(acc util.Uint160) (*state.TokenTransferInfo, error) {
key := storage.AppendPrefix(storage.STTokenTransferInfo, acc.BytesBE())
bs := state.NewTokenTransferInfo()
err := dao.GetAndDecode(bs, key)
if err != nil && err != storage.ErrKeyNotFound {
return nil, err
}
return bs, nil
}
// PutTokenTransferInfo saves NEP-17 transfer info in the cache.
func (dao *Simple) PutTokenTransferInfo(acc util.Uint160, bs *state.TokenTransferInfo) error {
return dao.putTokenTransferInfo(acc, bs, io.NewBufBinWriter())
}
func (dao *Simple) putTokenTransferInfo(acc util.Uint160, bs *state.TokenTransferInfo, buf *io.BufBinWriter) error {
key := storage.AppendPrefix(storage.STTokenTransferInfo, acc.BytesBE())
return dao.putWithBuffer(bs, key, buf)
}
// -- end NEP-17 transfer info.
// -- start transfer log.
func getTokenTransferLogKey(acc util.Uint160, index uint32, isNEP11 bool) []byte {
key := make([]byte, 1+util.Uint160Size+4)
if isNEP11 {
key[0] = byte(storage.STNEP11Transfers)
} else {
key[0] = byte(storage.STNEP17Transfers)
}
copy(key[1:], acc.BytesBE())
binary.LittleEndian.PutUint32(key[util.Uint160Size:], index)
return key
}
// GetTokenTransferLog retrieves transfer log from the cache.
func (dao *Simple) GetTokenTransferLog(acc util.Uint160, index uint32, isNEP11 bool) (*state.TokenTransferLog, error) {
key := getTokenTransferLogKey(acc, index, isNEP11)
value, err := dao.Store.Get(key)
if err != nil {
if err == storage.ErrKeyNotFound {
return new(state.TokenTransferLog), nil
}
return nil, err
}
return &state.TokenTransferLog{Raw: value}, nil
}
// PutTokenTransferLog saves given transfer log in the cache.
func (dao *Simple) PutTokenTransferLog(acc util.Uint160, index uint32, isNEP11 bool, lg *state.TokenTransferLog) error {
key := getTokenTransferLogKey(acc, index, isNEP11)
return dao.Store.Put(key, lg.Raw)
}
// -- end transfer log.
// -- start notification event.
// GetAppExecResults gets application execution results with the specified trigger from the
// given store.
func (dao *Simple) GetAppExecResults(hash util.Uint256, trig trigger.Type) ([]state.AppExecResult, error) {
key := storage.AppendPrefix(storage.DataExecutable, hash.BytesBE())
bs, err := dao.Store.Get(key)
if err != nil {
return nil, err
}
r := io.NewBinReaderFromBuf(bs)
switch r.ReadB() {
case storage.ExecBlock:
_, err = block.NewTrimmedFromReader(dao.Version.StateRootInHeader, r)
if err != nil {
return nil, err
}
case storage.ExecTransaction:
_ = r.ReadU32LE()
tx := &transaction.Transaction{}
tx.DecodeBinary(r)
}
if r.Err != nil {
return nil, r.Err
}
result := make([]state.AppExecResult, 0, 2)
for {
aer := new(state.AppExecResult)
aer.DecodeBinary(r)
if r.Err != nil {
if r.Err == iocore.EOF {
break
}
return nil, r.Err
}
if aer.Trigger&trig != 0 {
result = append(result, *aer)
}
}
return result, nil
}
// -- end notification event.
// -- start storage item.
// GetStorageItem returns StorageItem if it exists in the given store.
func (dao *Simple) GetStorageItem(id int32, key []byte) state.StorageItem {
b, err := dao.Store.Get(makeStorageItemKey(dao.Version.StoragePrefix, id, key))
if err != nil {
return nil
}
return b
}
// PutStorageItem puts given StorageItem for given id with given
// key into the given store.
func (dao *Simple) PutStorageItem(id int32, key []byte, si state.StorageItem) error {
stKey := makeStorageItemKey(dao.Version.StoragePrefix, id, key)
return dao.Store.Put(stKey, si)
}
// DeleteStorageItem drops storage item for the given id with the
// given key from the store.
func (dao *Simple) DeleteStorageItem(id int32, key []byte) error {
stKey := makeStorageItemKey(dao.Version.StoragePrefix, id, key)
return dao.Store.Delete(stKey)
}
// GetStorageItems returns all storage items for a given id.
func (dao *Simple) GetStorageItems(id int32) ([]state.StorageItemWithKey, error) {
return dao.GetStorageItemsWithPrefix(id, nil)
}
// GetStorageItemsWithPrefix returns all storage items with given id for a
// given scripthash.
func (dao *Simple) GetStorageItemsWithPrefix(id int32, prefix []byte) ([]state.StorageItemWithKey, error) {
var siArr []state.StorageItemWithKey
saveToArr := func(k, v []byte) {
// Cut prefix and hash.
// #1468, but don't need to copy here, because it is done by Store.
siArr = append(siArr, state.StorageItemWithKey{
Key: k,
Item: state.StorageItem(v),
})
}
dao.Seek(id, storage.SeekRange{Prefix: prefix}, saveToArr)
return siArr, nil
}
// Seek executes f for all storage items matching a given `rng` (matching given prefix and
// starting from the point specified). If key or value is to be used outside of f, they
// may not be copied.
func (dao *Simple) Seek(id int32, rng storage.SeekRange, f func(k, v []byte)) {
rng.Prefix = makeStorageItemKey(dao.Version.StoragePrefix, id, rng.Prefix)
dao.Store.Seek(rng, func(k, v []byte) {
f(k[len(rng.Prefix):], v)
})
}
// SeekAsync sends all storage items matching a given `rng` (matching given prefix and
// starting from the point specified) to a channel and returns the channel.
// Resulting keys and values may not be copied.
func (dao *Simple) SeekAsync(ctx context.Context, id int32, rng storage.SeekRange) chan storage.KeyValue {
rng.Prefix = makeStorageItemKey(dao.Version.StoragePrefix, id, rng.Prefix)
return dao.Store.SeekAsync(ctx, rng, true)
}
// makeStorageItemKey returns a key used to store StorageItem in the DB.
func makeStorageItemKey(prefix storage.KeyPrefix, id int32, key []byte) []byte {
// 1 for prefix + 4 for Uint32 + len(key) for key
buf := make([]byte, 5+len(key))
buf[0] = byte(prefix)
binary.LittleEndian.PutUint32(buf[1:], uint32(id))
copy(buf[5:], key)
return buf
}
// -- end storage item.
// -- other.
// GetBlock returns Block by the given hash if it exists in the store.
func (dao *Simple) GetBlock(hash util.Uint256) (*block.Block, error) {
key := storage.AppendPrefix(storage.DataExecutable, hash.BytesBE())
b, err := dao.Store.Get(key)
if err != nil {
return nil, err
}
r := io.NewBinReaderFromBuf(b)
if r.ReadB() != storage.ExecBlock {
return nil, errors.New("internal DB inconsistency")
}
block, err := block.NewTrimmedFromReader(dao.Version.StateRootInHeader, r)
if err != nil {
return nil, err
}
return block, nil
}
// Version represents current dao version.
type Version struct {
StoragePrefix storage.KeyPrefix
StateRootInHeader bool
P2PSigExtensions bool
P2PStateExchangeExtensions bool
KeepOnlyLatestState bool
Value string
}
const (
stateRootInHeaderBit = 1 << iota
p2pSigExtensionsBit
p2pStateExchangeExtensionsBit
keepOnlyLatestStateBit
)
// FromBytes decodes v from a byte-slice.
func (v *Version) FromBytes(data []byte) error {
if len(data) == 0 {
return errors.New("missing version")
}
i := 0
for ; i < len(data) && data[i] != '\x00'; i++ {
}
if i == len(data) {
v.Value = string(data)
return nil
}
if len(data) != i+3 {
return errors.New("version is invalid")
}
v.Value = string(data[:i])
v.StoragePrefix = storage.KeyPrefix(data[i+1])
v.StateRootInHeader = data[i+2]&stateRootInHeaderBit != 0
v.P2PSigExtensions = data[i+2]&p2pSigExtensionsBit != 0
v.P2PStateExchangeExtensions = data[i+2]&p2pStateExchangeExtensionsBit != 0
v.KeepOnlyLatestState = data[i+2]&keepOnlyLatestStateBit != 0
return nil
}
// Bytes encodes v to a byte-slice.
func (v *Version) Bytes() []byte {
var mask byte
if v.StateRootInHeader {
mask |= stateRootInHeaderBit
}
if v.P2PSigExtensions {
mask |= p2pSigExtensionsBit
}
if v.P2PStateExchangeExtensions {
mask |= p2pStateExchangeExtensionsBit
}
if v.KeepOnlyLatestState {
mask |= keepOnlyLatestStateBit
}
return append([]byte(v.Value), '\x00', byte(v.StoragePrefix), mask)
}
// GetVersion attempts to get the current version stored in the
// underlying store.
func (dao *Simple) GetVersion() (Version, error) {
var version Version
data, err := dao.Store.Get(storage.SYSVersion.Bytes())
if err == nil {
err = version.FromBytes(data)
}
return version, err
}
// GetCurrentBlockHeight returns the current block height found in the
// underlying store.
func (dao *Simple) GetCurrentBlockHeight() (uint32, error) {
b, err := dao.Store.Get(storage.SYSCurrentBlock.Bytes())
if err != nil {
return 0, err
}
return binary.LittleEndian.Uint32(b[32:36]), nil
}
// GetCurrentHeaderHeight returns the current header height and hash from
// the underlying store.
func (dao *Simple) GetCurrentHeaderHeight() (i uint32, h util.Uint256, err error) {
var b []byte
b, err = dao.Store.Get(storage.SYSCurrentHeader.Bytes())
if err != nil {
return
}
i = binary.LittleEndian.Uint32(b[32:36])
h, err = util.Uint256DecodeBytesLE(b[:32])
return
}
// GetStateSyncPoint returns current state synchronisation point P.
func (dao *Simple) GetStateSyncPoint() (uint32, error) {
b, err := dao.Store.Get(storage.SYSStateSyncPoint.Bytes())
if err != nil {
return 0, err
}
return binary.LittleEndian.Uint32(b), nil
}
// GetStateSyncCurrentBlockHeight returns current block height stored during state
// synchronisation process.
func (dao *Simple) GetStateSyncCurrentBlockHeight() (uint32, error) {
b, err := dao.Store.Get(storage.SYSStateSyncCurrentBlockHeight.Bytes())
if err != nil {
return 0, err
}
return binary.LittleEndian.Uint32(b), nil
}
// GetHeaderHashes returns a sorted list of header hashes retrieved from
// the given underlying store.
func (dao *Simple) GetHeaderHashes() ([]util.Uint256, error) {
hashMap := make(map[uint32][]util.Uint256)
dao.Store.Seek(storage.SeekRange{
Prefix: storage.IXHeaderHashList.Bytes(),
}, func(k, v []byte) {
storedCount := binary.LittleEndian.Uint32(k[1:])
hashes, err := read2000Uint256Hashes(v)
if err != nil {
panic(err)
}
hashMap[storedCount] = hashes
})
var (
hashes = make([]util.Uint256, 0, len(hashMap))
sortedKeys = make([]uint32, 0, len(hashMap))
)
for k := range hashMap {
sortedKeys = append(sortedKeys, k)
}
sort.Slice(sortedKeys, func(i, j int) bool { return sortedKeys[i] < sortedKeys[j] })
for _, key := range sortedKeys {
hashes = append(hashes[:key], hashMap[key]...)
}
return hashes, nil
}
// GetTransaction returns Transaction and its height by the given hash
// if it exists in the store. It does not return dummy transactions.
func (dao *Simple) GetTransaction(hash util.Uint256) (*transaction.Transaction, uint32, error) {
key := storage.AppendPrefix(storage.DataExecutable, hash.BytesBE())
b, err := dao.Store.Get(key)
if err != nil {
return nil, 0, err
}
if len(b) < 6 {
return nil, 0, errors.New("bad transaction bytes")
}
if b[0] != storage.ExecTransaction {
return nil, 0, errors.New("internal DB inconsistency")
}
if b[5] == transaction.DummyVersion {
return nil, 0, storage.ErrKeyNotFound
}
r := io.NewBinReaderFromBuf(b)
_ = r.ReadB()
var height = r.ReadU32LE()
tx := &transaction.Transaction{}
tx.DecodeBinary(r)
if r.Err != nil {
return nil, 0, r.Err
}
return tx, height, nil
}
// PutVersion stores the given version in the underlying store.
func (dao *Simple) PutVersion(v Version) error {
dao.Version = v
return dao.Store.Put(storage.SYSVersion.Bytes(), v.Bytes())
}
// PutCurrentHeader stores current header.
func (dao *Simple) PutCurrentHeader(hashAndIndex []byte) error {
return dao.Store.Put(storage.SYSCurrentHeader.Bytes(), hashAndIndex)
}
// PutStateSyncPoint stores current state synchronisation point P.
func (dao *Simple) PutStateSyncPoint(p uint32) error {
buf := make([]byte, 4)
binary.LittleEndian.PutUint32(buf, p)
return dao.Store.Put(storage.SYSStateSyncPoint.Bytes(), buf)
}
// PutStateSyncCurrentBlockHeight stores current block height during state synchronisation process.
func (dao *Simple) PutStateSyncCurrentBlockHeight(h uint32) error {
buf := make([]byte, 4)
binary.LittleEndian.PutUint32(buf, h)
return dao.Store.Put(storage.SYSStateSyncCurrentBlockHeight.Bytes(), buf)
}
// read2000Uint256Hashes attempts to read 2000 Uint256 hashes from
// the given byte array.
func read2000Uint256Hashes(b []byte) ([]util.Uint256, error) {
r := bytes.NewReader(b)
br := io.NewBinReaderFromIO(r)
hashes := make([]util.Uint256, 0)
br.ReadArray(&hashes)
if br.Err != nil {
return nil, br.Err
}
return hashes, nil
}
// HasTransaction returns nil if the given store does not contain the given
// Transaction hash. It returns an error in case if transaction is in chain
// or in the list of conflicting transactions.
func (dao *Simple) HasTransaction(hash util.Uint256) error {
key := storage.AppendPrefix(storage.DataExecutable, hash.BytesBE())
bytes, err := dao.Store.Get(key)
if err != nil {
return nil
}
if len(bytes) < 6 {
return nil
}
if bytes[5] == transaction.DummyVersion {
return ErrHasConflicts
}
return ErrAlreadyExists
}
// StoreAsBlock stores given block as DataBlock. It can reuse given buffer for
// the purpose of value serialization.
func (dao *Simple) StoreAsBlock(block *block.Block, aer1 *state.AppExecResult, aer2 *state.AppExecResult, buf *io.BufBinWriter) error {
var (
key = storage.AppendPrefix(storage.DataExecutable, block.Hash().BytesBE())
)
if buf == nil {
buf = io.NewBufBinWriter()
}
buf.WriteB(storage.ExecBlock)
b, err := block.Trim()
if err != nil {
return err
}
buf.WriteBytes(b)
if aer1 != nil {
aer1.EncodeBinary(buf.BinWriter)
}
if aer2 != nil {
aer2.EncodeBinary(buf.BinWriter)
}
if buf.Err != nil {
return buf.Err
}
return dao.Store.Put(key, buf.Bytes())
}
// DeleteBlock removes block from dao.
func (dao *Simple) DeleteBlock(h util.Uint256, w *io.BufBinWriter) error {
batch := dao.Store.Batch()
key := make([]byte, util.Uint256Size+1)
key[0] = byte(storage.DataExecutable)
copy(key[1:], h.BytesBE())
bs, err := dao.Store.Get(key)
if err != nil {
return err
}
r := io.NewBinReaderFromBuf(bs)
if r.ReadB() != storage.ExecBlock {
return errors.New("internal DB inconsistency")
}
b, err := block.NewTrimmedFromReader(dao.Version.StateRootInHeader, r)
if err != nil {
return err
}
if w == nil {
w = io.NewBufBinWriter()
}
w.WriteB(storage.ExecBlock)
b.Header.EncodeBinary(w.BinWriter)
w.BinWriter.WriteB(0)
if w.Err != nil {
return w.Err
}
batch.Put(key, w.Bytes())
for _, tx := range b.Transactions {
copy(key[1:], tx.Hash().BytesBE())
batch.Delete(key)
if dao.Version.P2PSigExtensions {
for _, attr := range tx.GetAttributes(transaction.ConflictsT) {
hash := attr.Value.(*transaction.Conflicts).Hash
copy(key[1:], hash.BytesBE())
batch.Delete(key)
}
}
}
return dao.Store.PutBatch(batch)
}
// StoreAsCurrentBlock stores a hash of the given block with prefix
// SYSCurrentBlock. It can reuse given buffer for the purpose of value
// serialization.
func (dao *Simple) StoreAsCurrentBlock(block *block.Block, buf *io.BufBinWriter) error {
if buf == nil {
buf = io.NewBufBinWriter()
}
h := block.Hash()
h.EncodeBinary(buf.BinWriter)
buf.WriteU32LE(block.Index)
return dao.Store.Put(storage.SYSCurrentBlock.Bytes(), buf.Bytes())
}
// StoreAsTransaction stores given TX as DataTransaction. It also stores transactions
// given tx has conflicts with as DataTransaction with dummy version. It can reuse given
// buffer for the purpose of value serialization.
func (dao *Simple) StoreAsTransaction(tx *transaction.Transaction, index uint32, aer *state.AppExecResult, buf *io.BufBinWriter) error {
key := storage.AppendPrefix(storage.DataExecutable, tx.Hash().BytesBE())
if buf == nil {
buf = io.NewBufBinWriter()
}
buf.WriteB(storage.ExecTransaction)
buf.WriteU32LE(index)
tx.EncodeBinary(buf.BinWriter)
if aer != nil {
aer.EncodeBinary(buf.BinWriter)
}
if buf.Err != nil {
return buf.Err
}
err := dao.Store.Put(key, buf.Bytes())
if err != nil {
return err
}
if dao.Version.P2PSigExtensions {
var value []byte
for _, attr := range tx.GetAttributes(transaction.ConflictsT) {
hash := attr.Value.(*transaction.Conflicts).Hash
copy(key[1:], hash.BytesBE())
if value == nil {
buf.Reset()
buf.WriteB(storage.ExecTransaction)
buf.WriteU32LE(index)
buf.BinWriter.WriteB(transaction.DummyVersion)
value = buf.Bytes()
}
err = dao.Store.Put(key, value)
if err != nil {
return fmt.Errorf("failed to store conflicting transaction %s for transaction %s: %w", hash.StringLE(), tx.Hash().StringLE(), err)
}
}
}
return nil
}
// Persist flushes all the changes made into the (supposedly) persistent
// underlying store. It doesn't block accesses to DAO from other threads.
func (dao *Simple) Persist() (int, error) {
return dao.Store.Persist()
}
// PersistSync flushes all the changes made into the (supposedly) persistent
// underlying store. It's a synchronous version of Persist that doesn't allow
// other threads to work with DAO while flushing the Store.
func (dao *Simple) PersistSync() (int, error) {
return dao.Store.PersistSync()
}
// GetMPTBatch storage changes to be applied to MPT.
func (dao *Simple) GetMPTBatch() mpt.Batch {
var b mpt.Batch
dao.Store.MemoryStore.SeekAll([]byte{byte(dao.Version.StoragePrefix)}, func(k, v []byte) {
b.Add(k[1:], v)
})
return b
}