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lockbased_tx_simulator.go
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lockbased_tx_simulator.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package lockbasedtxmgr
import (
"errors"
"fmt"
commonledger "github.com/hyperledger/fabric/common/ledger"
"github.com/hyperledger/fabric/core/ledger"
"github.com/hyperledger/fabric/core/ledger/kvledger/txmgmt/rwsetutil"
"github.com/hyperledger/fabric/core/ledger/kvledger/txmgmt/txmgr"
)
// LockBasedTxSimulator is a transaction simulator used in `LockBasedTxMgr`
type lockBasedTxSimulator struct {
lockBasedQueryExecutor
rwsetBuilder *rwsetutil.RWSetBuilder
writePerformed bool
pvtdataQueriesPerformed bool
simulationResultsComputed bool
}
func newLockBasedTxSimulator(txmgr *LockBasedTxMgr, txid string) (*lockBasedTxSimulator, error) {
rwsetBuilder := rwsetutil.NewRWSetBuilder()
helper := newQueryHelper(txmgr, rwsetBuilder)
logger.Debugf("constructing new tx simulator txid = [%s]", txid)
return &lockBasedTxSimulator{lockBasedQueryExecutor{helper, txid}, rwsetBuilder, false, false, false}, nil
}
// SetState implements method in interface `ledger.TxSimulator`
func (s *lockBasedTxSimulator) SetState(ns string, key string, value []byte) error {
if err := s.helper.checkDone(); err != nil {
return err
}
if err := s.checkBeforeWrite(); err != nil {
return err
}
if err := s.helper.txmgr.db.ValidateKeyValue(key, value); err != nil {
return err
}
s.rwsetBuilder.AddToWriteSet(ns, key, value)
return nil
}
// DeleteState implements method in interface `ledger.TxSimulator`
func (s *lockBasedTxSimulator) DeleteState(ns string, key string) error {
return s.SetState(ns, key, nil)
}
// SetStateMultipleKeys implements method in interface `ledger.TxSimulator`
func (s *lockBasedTxSimulator) SetStateMultipleKeys(namespace string, kvs map[string][]byte) error {
for k, v := range kvs {
if err := s.SetState(namespace, k, v); err != nil {
return err
}
}
return nil
}
// SetStateMetadata implements method in interface `ledger.TxSimulator`
func (s *lockBasedTxSimulator) SetStateMetadata(namespace, key string, metadata map[string][]byte) error {
return errors.New("not implemented")
}
// DeleteStateMetadata implements method in interface `ledger.TxSimulator`
func (s *lockBasedTxSimulator) DeleteStateMetadata(namespace, key string) error {
return errors.New("not implemented")
}
// SetPrivateData implements method in interface `ledger.TxSimulator`
func (s *lockBasedTxSimulator) SetPrivateData(ns, coll, key string, value []byte) error {
if err := s.helper.validateCollName(ns, coll); err != nil {
return err
}
if err := s.helper.checkDone(); err != nil {
return err
}
if err := s.checkBeforeWrite(); err != nil {
return err
}
if err := s.helper.txmgr.db.ValidateKeyValue(key, value); err != nil {
return err
}
s.writePerformed = true
s.rwsetBuilder.AddToPvtAndHashedWriteSet(ns, coll, key, value)
return nil
}
// DeletePrivateData implements method in interface `ledger.TxSimulator`
func (s *lockBasedTxSimulator) DeletePrivateData(ns, coll, key string) error {
return s.SetPrivateData(ns, coll, key, nil)
}
// SetPrivateDataMultipleKeys implements method in interface `ledger.TxSimulator`
func (s *lockBasedTxSimulator) SetPrivateDataMultipleKeys(ns, coll string, kvs map[string][]byte) error {
for k, v := range kvs {
if err := s.SetPrivateData(ns, coll, k, v); err != nil {
return err
}
}
return nil
}
// GetPrivateDataRangeScanIterator implements method in interface `ledger.TxSimulator`
func (s *lockBasedTxSimulator) GetPrivateDataRangeScanIterator(namespace, collection, startKey, endKey string) (commonledger.ResultsIterator, error) {
if err := s.checkBeforePvtdataQueries(); err != nil {
return nil, err
}
return s.lockBasedQueryExecutor.GetPrivateDataRangeScanIterator(namespace, collection, startKey, endKey)
}
// SetPrivateDataMetadata implements method in interface `ledger.TxSimulator`
func (s *lockBasedTxSimulator) SetPrivateDataMetadata(namespace, collection, key string, metadata map[string][]byte) error {
return errors.New("not implemented")
}
// DeletePrivateMetadata implements method in interface `ledger.TxSimulator`
func (s *lockBasedTxSimulator) DeletePrivateDataMetadata(namespace, collection, key string) error {
return errors.New("not implemented")
}
// ExecuteQueryOnPrivateData implements method in interface `ledger.TxSimulator`
func (s *lockBasedTxSimulator) ExecuteQueryOnPrivateData(namespace, collection, query string) (commonledger.ResultsIterator, error) {
if err := s.checkBeforePvtdataQueries(); err != nil {
return nil, err
}
return s.lockBasedQueryExecutor.ExecuteQueryOnPrivateData(namespace, collection, query)
}
// GetTxSimulationResults implements method in interface `ledger.TxSimulator`
func (s *lockBasedTxSimulator) GetTxSimulationResults() (*ledger.TxSimulationResults, error) {
if s.simulationResultsComputed {
return nil, errors.New("the function GetTxSimulationResults() should only be called once on a transaction simulator instance")
}
defer func() { s.simulationResultsComputed = true }()
logger.Debugf("Simulation completed, getting simulation results")
if s.helper.err != nil {
return nil, s.helper.err
}
s.helper.addRangeQueryInfo()
return s.rwsetBuilder.GetTxSimulationResults()
}
// ExecuteUpdate implements method in interface `ledger.TxSimulator`
func (s *lockBasedTxSimulator) ExecuteUpdate(query string) error {
return errors.New("Not supported")
}
func (s *lockBasedTxSimulator) checkBeforeWrite() error {
if s.pvtdataQueriesPerformed {
return &txmgr.ErrUnsupportedTransaction{
Msg: fmt.Sprintf("Tx [%s]: Transaction has already performed queries on pvt data. Writes are not allowed", s.txid),
}
}
s.writePerformed = true
return nil
}
func (s *lockBasedTxSimulator) checkBeforePvtdataQueries() error {
if s.writePerformed {
return &txmgr.ErrUnsupportedTransaction{
Msg: fmt.Sprintf("Tx [%s]: Queries on pvt data is supported only in a read-only transaction", s.txid),
}
}
s.pvtdataQueriesPerformed = true
return nil
}