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store.go
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store.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package transientstore
import (
"errors"
"github.com/golang/protobuf/proto"
"github.com/hyperledger/fabric/protos/ledger/rwset"
"github.com/hyperledger/fabric/common/flogging"
"github.com/hyperledger/fabric/common/ledger/util/leveldbhelper"
"github.com/hyperledger/fabric/common/util"
"github.com/hyperledger/fabric/core/ledger"
"github.com/hyperledger/fabric/core/ledger/pvtdatastorage"
"github.com/syndtr/goleveldb/leveldb/iterator"
)
var logger = flogging.MustGetLogger("transientstore")
var emptyValue = []byte{}
// ErrStoreEmpty is used to indicate that there are no entries in transient store
var ErrStoreEmpty = errors.New("Transient store is empty")
//////////////////////////////////////////////
// Interfaces and data types
/////////////////////////////////////////////
// StoreProvider provides an instance of a TransientStore
type StoreProvider interface {
OpenStore(ledgerID string) (Store, error)
Close()
}
// RWSetScanner provides an iterator for EndorserPvtSimulationResults
type RWSetScanner interface {
// Next returns the next EndorserPvtSimulationResults from the RWSetScanner.
// It may return nil, nil when it has no further data, and also may return an error
// on failure
Next() (*EndorserPvtSimulationResults, error)
// Close frees the resources associated with this RWSetScanner
Close()
}
// Store manages the storage of private write sets for a ledgerId.
// Ideally, a ledger can remove the data from this storage when it is committed to
// the permanent storage or the pruning of some data items is enforced by the policy
type Store interface {
// Persist stores the private write set of a transaction in the transient store
// based on txid and the block height the private data was received at
Persist(txid string, blockHeight uint64, privateSimulationResults *rwset.TxPvtReadWriteSet) error
// GetTxPvtRWSetByTxid returns an iterator due to the fact that the txid may have multiple private
// write sets persisted from different endorsers (via Gossip)
GetTxPvtRWSetByTxid(txid string, filter ledger.PvtNsCollFilter) (RWSetScanner, error)
// PurgeByTxids removes private write sets of a given set of transactions from the
// transient store
PurgeByTxids(txids []string) error
// PurgeByHeight removes private write sets at block height lesser than
// a given maxBlockNumToRetain. In other words, Purge only retains private write sets
// that were persisted at block height of maxBlockNumToRetain or higher. Though the private
// write sets stored in transient store is removed by coordinator using PurgebyTxids()
// after successful block commit, PurgeByHeight() is still required to remove orphan entries (as
// transaction that gets endorsed may not be submitted by the client for commit)
PurgeByHeight(maxBlockNumToRetain uint64) error
// GetMinTransientBlkHt returns the lowest block height remaining in transient store
GetMinTransientBlkHt() (uint64, error)
Shutdown()
}
// EndorserPvtSimulationResults captures the details of the simulation results specific to an endorser
type EndorserPvtSimulationResults struct {
ReceivedAtBlockHeight uint64
PvtSimulationResults *rwset.TxPvtReadWriteSet
}
//////////////////////////////////////////////
// Implementation
/////////////////////////////////////////////
// storeProvider encapsulates a leveldb provider which is used to store
// private write sets of simulated transactions, and implements TransientStoreProvider
// interface.
type storeProvider struct {
dbProvider *leveldbhelper.Provider
}
// store holds an instance of a levelDB.
type store struct {
db *leveldbhelper.DBHandle
ledgerID string
}
type RwsetScanner struct {
txid string
dbItr iterator.Iterator
filter ledger.PvtNsCollFilter
}
// NewStoreProvider instantiates TransientStoreProvider
func NewStoreProvider() StoreProvider {
dbProvider := leveldbhelper.NewProvider(&leveldbhelper.Conf{DBPath: GetTransientStorePath()})
return &storeProvider{dbProvider: dbProvider}
}
// OpenStore returns a handle to a ledgerId in Store
func (provider *storeProvider) OpenStore(ledgerID string) (Store, error) {
dbHandle := provider.dbProvider.GetDBHandle(ledgerID)
return &store{db: dbHandle, ledgerID: ledgerID}, nil
}
// Close closes the TransientStoreProvider
func (provider *storeProvider) Close() {
provider.dbProvider.Close()
}
// Persist stores the private write set of a transaction in the transient store
// based on txid and the block height the private data was received at
func (s *store) Persist(txid string, blockHeight uint64,
privateSimulationResults *rwset.TxPvtReadWriteSet) error {
logger.Debugf("Persisting private data to transient store for txid = %s", txid)
dbBatch := leveldbhelper.NewUpdateBatch()
// Create compositeKey with appropriate prefix, txid, uuid and blockHeight
// Due to the fact that the txid may have multiple private write sets persisted from different
// endorsers (via Gossip), we postfix an uuid with the txid to avoid collision.
uuid := util.GenerateUUID()
compositeKeyPvtRWSet := createCompositeKeyForPvtRWSet(txid, uuid, blockHeight)
privateSimulationResultsBytes, err := proto.Marshal(privateSimulationResults)
if err != nil {
return err
}
dbBatch.Put(compositeKeyPvtRWSet, privateSimulationResultsBytes)
// Create two index: (i) by txid, and (ii) by height
// Create compositeKey for purge index by height with appropriate prefix, blockHeight,
// txid, uuid and store the compositeKey (purge index) with a null byte as value. Note that
// the purge index is used to remove orphan entries in the transient store (which are not removed
// by PurgeTxids()) using BTL policy by PurgeByHeight(). Note that orphan entries are due to transaction
// that gets endorsed but not submitted by the client for commit)
compositeKeyPurgeIndexByHeight := createCompositeKeyForPurgeIndexByHeight(blockHeight, txid, uuid)
dbBatch.Put(compositeKeyPurgeIndexByHeight, emptyValue)
// Create compositeKey for purge index by txid with appropriate prefix, txid, uuid,
// blockHeight and store the compositeKey (purge index) with a null byte as value.
// Though compositeKeyPvtRWSet itself can be used to purge private write set by txid,
// we create a separate composite key with a null byte as value. The reason is that
// if we use compositeKeyPvtRWSet, we unnecessarily read (potentially large) private write
// set associated with the key from db. Note that this purge index is used to remove non-orphan
// entries in the transient store and is used by PurgeTxids()
// Note: We can create compositeKeyPurgeIndexByTxid by just replacing the prefix of compositeKeyPvtRWSet
// with purgeIndexByTxidPrefix. For code readability and to be expressive, we use a
// createCompositeKeyForPurgeIndexByTxid() instead.
compositeKeyPurgeIndexByTxid := createCompositeKeyForPurgeIndexByTxid(txid, uuid, blockHeight)
dbBatch.Put(compositeKeyPurgeIndexByTxid, emptyValue)
return s.db.WriteBatch(dbBatch, true)
}
// GetTxPvtRWSetByTxid returns an iterator due to the fact that the txid may have multiple private
// write sets persisted from different endorsers.
func (s *store) GetTxPvtRWSetByTxid(txid string, filter ledger.PvtNsCollFilter) (RWSetScanner, error) {
logger.Debugf("Getting private data from transient store for transaction %s", txid)
// Construct startKey and endKey to do an range query
startKey := createTxidRangeStartKey(txid)
endKey := createTxidRangeEndKey(txid)
iter := s.db.GetIterator(startKey, endKey)
return &RwsetScanner{txid, iter, filter}, nil
}
// PurgeByTxids removes private write sets of a given set of transactions from the
// transient store. PurgeByTxids() is expected to be called by coordinator after
// committing a block to ledger.
func (s *store) PurgeByTxids(txids []string) error {
logger.Debug("Purging private data from transient store for committed txids")
dbBatch := leveldbhelper.NewUpdateBatch()
for _, txid := range txids {
// Construct startKey and endKey to do an range query
startKey := createPurgeIndexByTxidRangeStartKey(txid)
endKey := createPurgeIndexByTxidRangeEndKey(txid)
iter := s.db.GetIterator(startKey, endKey)
// Get all txid and uuid from above result and remove it from transient store (both
// write set and the corresponding indexes.
for iter.Next() {
// For each entry, remove the private read-write set and correponding indexes
// Remove private write set
compositeKeyPurgeIndexByTxid := iter.Key()
// Note: We can create compositeKeyPvtRWSet by just replacing the prefix of compositeKeyPurgeIndexByTxid
// with prwsetPrefix. For code readability and to be expressive, we split and create again.
uuid, blockHeight := splitCompositeKeyOfPurgeIndexByTxid(compositeKeyPurgeIndexByTxid)
compositeKeyPvtRWSet := createCompositeKeyForPvtRWSet(txid, uuid, blockHeight)
dbBatch.Delete(compositeKeyPvtRWSet)
// Remove purge index -- purgeIndexByHeight
compositeKeyPurgeIndexByHeight := createCompositeKeyForPurgeIndexByHeight(blockHeight, txid, uuid)
dbBatch.Delete(compositeKeyPurgeIndexByHeight)
// Remove purge index -- purgeIndexByTxid
dbBatch.Delete(compositeKeyPurgeIndexByTxid)
}
iter.Release()
}
// If peer fails before/while writing the batch to golevelDB, these entries will be
// removed as per BTL policy later by PurgeByHeight()
return s.db.WriteBatch(dbBatch, true)
}
// PurgeByHeight removes private write sets at block height lesser than
// a given maxBlockNumToRetain. In other words, Purge only retains private write sets
// that were persisted at block height of maxBlockNumToRetain or higher. Though the private
// write sets stored in transient store is removed by coordinator using PurgebyTxids()
// after successful block commit, PurgeByHeight() is still required to remove orphan entries (as
// transaction that gets endorsed may not be submitted by the client for commit)
func (s *store) PurgeByHeight(maxBlockNumToRetain uint64) error {
logger.Debugf("Purging orphaned private data from transient store received prior to block [%d]", maxBlockNumToRetain)
// Do a range query with 0 as startKey and maxBlockNumToRetain-1 as endKey
startKey := createPurgeIndexByHeightRangeStartKey(0)
endKey := createPurgeIndexByHeightRangeEndKey(maxBlockNumToRetain - 1)
iter := s.db.GetIterator(startKey, endKey)
dbBatch := leveldbhelper.NewUpdateBatch()
// Get all txid and uuid from above result and remove it from transient store (both
// write set and the corresponding index.
for iter.Next() {
// For each entry, remove the private read-write set and correponding indexes
// Remove private write set
compositeKeyPurgeIndexByHeight := iter.Key()
txid, uuid, blockHeight := splitCompositeKeyOfPurgeIndexByHeight(compositeKeyPurgeIndexByHeight)
compositeKeyPvtRWSet := createCompositeKeyForPvtRWSet(txid, uuid, blockHeight)
dbBatch.Delete(compositeKeyPvtRWSet)
// Remove purge index -- purgeIndexByTxid
compositeKeyPurgeIndexByTxid := createCompositeKeyForPurgeIndexByTxid(txid, uuid, blockHeight)
dbBatch.Delete(compositeKeyPurgeIndexByTxid)
// Remove purge index -- purgeIndexByHeight
dbBatch.Delete(compositeKeyPurgeIndexByHeight)
}
iter.Release()
return s.db.WriteBatch(dbBatch, true)
}
// GetMinTransientBlkHt returns the lowest block height remaining in transient store
func (s *store) GetMinTransientBlkHt() (uint64, error) {
// Current approach performs a range query on purgeIndex with startKey
// as 0 (i.e., blockHeight) and returns the first key which denotes
// the lowest block height remaining in transient store. An alternative approach
// is to explicitly store the minBlockHeight in the transientStore.
startKey := createPurgeIndexByHeightRangeStartKey(0)
iter := s.db.GetIterator(startKey, nil)
// Fetch the minimum transient block height
if iter.Next() {
dbKey := iter.Key()
_, _, blockHeight := splitCompositeKeyOfPurgeIndexByHeight(dbKey)
return blockHeight, nil
}
iter.Release()
// Returning an error may not be the right thing to do here. May be
// return a bool. -1 is not possible due to unsigned int as first
// return value
return 0, ErrStoreEmpty
}
func (s *store) Shutdown() {
// do nothing because shared db is used
}
// Next moves the iterator to the next key/value pair.
// It returns whether the iterator is exhausted.
func (scanner *RwsetScanner) Next() (*EndorserPvtSimulationResults, error) {
if !scanner.dbItr.Next() {
return nil, nil
}
dbKey := scanner.dbItr.Key()
dbVal := scanner.dbItr.Value()
_, blockHeight := splitCompositeKeyOfPvtRWSet(dbKey)
txPvtRWSet := &rwset.TxPvtReadWriteSet{}
if err := proto.Unmarshal(dbVal, txPvtRWSet); err != nil {
return nil, err
}
filteredTxPvtRWSet := pvtdatastorage.TrimPvtWSet(txPvtRWSet, scanner.filter)
return &EndorserPvtSimulationResults{
ReceivedAtBlockHeight: blockHeight,
PvtSimulationResults: filteredTxPvtRWSet,
}, nil
}
// Close releases resource held by the iterator
func (scanner *RwsetScanner) Close() {
scanner.dbItr.Release()
}