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tx_ops_preparation.go
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tx_ops_preparation.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package valinternal
import (
"github.com/mcc-github/blockchain/core/ledger/kvledger/txmgmt/privacyenabledstate"
"github.com/mcc-github/blockchain/core/ledger/kvledger/txmgmt/rwsetutil"
"github.com/mcc-github/blockchain/core/ledger/kvledger/txmgmt/statedb"
"github.com/mcc-github/blockchain/core/ledger/kvledger/txmgmt/storageutil"
"github.com/mcc-github/blockchain/core/ledger/kvledger/txmgmt/version"
"github.com/mcc-github/blockchain/protos/ledger/rwset/kvrwset"
)
func prepareTxOps(rwset *rwsetutil.TxRwSet, txht *version.Height,
precedingUpdates *PubAndHashUpdates, db privacyenabledstate.DB) (txOps, error) {
txops := txOps{}
txops.applyTxRwset(rwset)
for ck, keyop := range txops {
if keyop.isDelete() || keyop.isUpsertAndMetadataUpdate() {
continue
}
if keyop.isOnlyUpsert() {
latestMetadata, err := retrieveLatestMetadata(ck.ns, ck.coll, ck.key, precedingUpdates, db)
if err != nil {
return nil, err
}
keyop.metadata = latestMetadata
continue
}
latestVal, err := retrieveLatestState(ck.ns, ck.coll, ck.key, precedingUpdates, db)
if err != nil {
return nil, err
}
if latestVal != nil {
keyop.value = latestVal.Value
} else {
delete(txops, ck)
}
}
return txops, nil
}
func (txops txOps) applyTxRwset(rwset *rwsetutil.TxRwSet) error {
for _, nsRWSet := range rwset.NsRwSets {
ns := nsRWSet.NameSpace
for _, kvWrite := range nsRWSet.KvRwSet.Writes {
txops.applyKVWrite(ns, "", kvWrite)
}
for _, kvMetadataWrite := range nsRWSet.KvRwSet.MetadataWrites {
txops.applyMetadata(ns, "", kvMetadataWrite)
}
for _, collHashRWset := range nsRWSet.CollHashedRwSets {
coll := collHashRWset.CollectionName
for _, hashedWrite := range collHashRWset.HashedRwSet.HashedWrites {
txops.applyKVWrite(ns, coll,
&kvrwset.KVWrite{
Key: string(hashedWrite.KeyHash),
Value: hashedWrite.ValueHash,
IsDelete: hashedWrite.IsDelete,
},
)
}
for _, metadataWrite := range collHashRWset.HashedRwSet.MetadataWrites {
txops.applyMetadata(ns, coll,
&kvrwset.KVMetadataWrite{
Key: string(metadataWrite.KeyHash),
Entries: metadataWrite.Entries,
},
)
}
}
}
return nil
}
func (txops txOps) applyKVWrite(ns, coll string, kvWrite *kvrwset.KVWrite) {
if kvWrite.IsDelete {
txops.delete(compositeKey{ns, coll, kvWrite.Key})
} else {
txops.upsert(compositeKey{ns, coll, kvWrite.Key}, kvWrite.Value)
}
}
func (txops txOps) applyMetadata(ns, coll string, metadataWrite *kvrwset.KVMetadataWrite) error {
if metadataWrite.Entries == nil {
txops.metadataDelete(compositeKey{ns, coll, metadataWrite.Key})
} else {
metadataBytes, err := storageutil.SerializeMetadata(metadataWrite.Entries)
if err != nil {
return err
}
txops.metadataUpdate(compositeKey{ns, coll, metadataWrite.Key}, metadataBytes)
}
return nil
}
func retrieveLatestState(ns, coll, key string,
precedingUpdates *PubAndHashUpdates, db privacyenabledstate.DB) (*statedb.VersionedValue, error) {
var vv *statedb.VersionedValue
var err error
if coll == "" {
vv := precedingUpdates.PubUpdates.Get(ns, key)
if vv == nil {
vv, err = db.GetState(ns, key)
}
return vv, err
}
vv = precedingUpdates.HashUpdates.Get(ns, coll, key)
if vv == nil {
vv, err = db.GetValueHash(ns, coll, []byte(key))
}
return vv, err
}
func retrieveLatestMetadata(ns, coll, key string,
precedingUpdates *PubAndHashUpdates, db privacyenabledstate.DB) ([]byte, error) {
if coll == "" {
vv := precedingUpdates.PubUpdates.Get(ns, key)
if vv != nil {
return vv.Metadata, nil
}
return db.GetStateMetadata(ns, key)
}
vv := precedingUpdates.HashUpdates.Get(ns, coll, key)
if vv != nil {
return vv.Metadata, nil
}
return db.GetPrivateDataMetadataByHash(ns, coll, []byte(key))
}