func newDataKey(chaincodeID string, key string) *dataKey {
logger.Debug("Enter - newDataKey. chaincodeID=[%s], key=[%s]", chaincodeID, key)
compositeKey := statemgmt.ConstructCompositeKey(chaincodeID, key)
bucketHash := conf.computeBucketHash(compositeKey)
// Adding one because - we start bucket-numbers 1 onwards
bucketNumber := int(bucketHash)%conf.getNumBucketsAtLowestLevel() + 1
dataKey := &dataKey{newBucketKeyAtLowestLevel(bucketNumber), compositeKey}
logger.Debug("Exit - newDataKey=[%s]", dataKey)
return dataKey
}
func TestStateImpl_ComputeHash_AllInMemory_1(t *testing.T) {
// number of buckets at each level 26,9,3,1
testHasher, stateImplTestWrapper, stateDelta := createFreshDBAndInitTestStateImplWithCustomHasher(t, 26, 3)
testHasher.populate("chaincodeID1", "key1", 0)
testHasher.populate("chaincodeID2", "key2", 0)
testHasher.populate("chaincodeID3", "key3", 0)
testHasher.populate("chaincodeID4", "key4", 3)
stateDelta.Set("chaincodeID1", "key1", []byte("value1"), nil)
stateDelta.Set("chaincodeID2", "key2", []byte("value2"), nil)
stateDelta.Set("chaincodeID3", "key3", []byte("value3"), nil)
stateDelta.Set("chaincodeID4", "key4", []byte("value4"), nil)
rootHash := stateImplTestWrapper.prepareWorkingSetAndComputeCryptoHash(stateDelta)
expectedHashBucket3_1 := testutil.ComputeCryptoHash(statemgmt.ConstructCompositeKey("chaincodeID1", "key1"), []byte("value1"),
statemgmt.ConstructCompositeKey("chaincodeID2", "key2"), []byte("value2"),
statemgmt.ConstructCompositeKey("chaincodeID3", "key3"), []byte("value3"))
expectedHashBucket3_4 := testutil.ComputeCryptoHash(statemgmt.ConstructCompositeKey("chaincodeID4", "key4"), []byte("value4"))
expectedHash := testutil.ComputeCryptoHash(expectedHashBucket3_1, expectedHashBucket3_4)
testutil.AssertEquals(t, rootHash, expectedHash)
}
// AddChangesForPersistence - method implementation for interface 'statemgmt.HashableState'
func (impl *StateImpl) AddChangesForPersistence(writeBatch *gorocksdb.WriteBatch) error {
delta := impl.stateDelta
if delta == nil {
return nil
}
openchainDB := db.GetDBHandle()
updatedChaincodeIds := delta.GetUpdatedChaincodeIds(false)
for _, updatedChaincodeID := range updatedChaincodeIds {
updates := delta.GetUpdates(updatedChaincodeID)
for updatedKey, value := range updates {
compositeKey := statemgmt.ConstructCompositeKey(updatedChaincodeID, updatedKey)
if value.IsDelete() {
writeBatch.DeleteCF(openchainDB.StateCF, compositeKey)
} else {
writeBatch.PutCF(openchainDB.StateCF, compositeKey, value.GetValue())
}
}
}
return nil
}
func TestStateImpl_ComputeHash_AllInMemory_2(t *testing.T) {
// number of buckets at each level 26,13,7,4,2,1
testHasher, stateImplTestWrapper, stateDelta := createFreshDBAndInitTestStateImplWithCustomHasher(t, 26, 2)
// first two buckets - meet at next level
testHasher.populate("chaincodeID1", "key1", 0)
testHasher.populate("chaincodeID2", "key2", 1)
// middle two buckets
testHasher.populate("chaincodeID3", "key3", 5)
testHasher.populate("chaincodeID4", "key4", 9)
// last two buckets - meet at next level
testHasher.populate("chaincodeID5", "key5", 24)
testHasher.populate("chaincodeID6", "key6", 25)
stateDelta.Set("chaincodeID1", "key1", []byte("value1"), nil)
stateDelta.Set("chaincodeID2", "key2", []byte("value2"), nil)
stateDelta.Set("chaincodeID3", "key3", []byte("value3"), nil)
stateDelta.Set("chaincodeID4", "key4", []byte("value4"), nil)
stateDelta.Set("chaincodeID5", "key5", []byte("value5"), nil)
stateDelta.Set("chaincodeID6", "key6", []byte("value6"), nil)
rootHash := stateImplTestWrapper.prepareWorkingSetAndComputeCryptoHash(stateDelta)
expectedHashBucket5_1 := testutil.ComputeCryptoHash(statemgmt.ConstructCompositeKey("chaincodeID1", "key1"), []byte("value1"))
expectedHashBucket5_2 := testutil.ComputeCryptoHash(statemgmt.ConstructCompositeKey("chaincodeID2", "key2"), []byte("value2"))
expectedHashBucket5_6 := testutil.ComputeCryptoHash(statemgmt.ConstructCompositeKey("chaincodeID3", "key3"), []byte("value3"))
expectedHashBucket5_10 := testutil.ComputeCryptoHash(statemgmt.ConstructCompositeKey("chaincodeID4", "key4"), []byte("value4"))
expectedHashBucket5_25 := testutil.ComputeCryptoHash(statemgmt.ConstructCompositeKey("chaincodeID5", "key5"), []byte("value5"))
expectedHashBucket5_26 := testutil.ComputeCryptoHash(statemgmt.ConstructCompositeKey("chaincodeID6", "key6"), []byte("value6"))
expectedHashBucket4_1 := testutil.ComputeCryptoHash(expectedHashBucket5_1, expectedHashBucket5_2)
expectedHashBucket4_13 := testutil.ComputeCryptoHash(expectedHashBucket5_25, expectedHashBucket5_26)
expectedHashBucket2_1 := testutil.ComputeCryptoHash(expectedHashBucket4_1, expectedHashBucket5_6)
expectedHashBucket1_1 := testutil.ComputeCryptoHash(expectedHashBucket2_1, expectedHashBucket5_10)
expectedHash := testutil.ComputeCryptoHash(expectedHashBucket1_1, expectedHashBucket4_13)
testutil.AssertEquals(t, rootHash, expectedHash)
}
func (testHasher *testHasher) populate(chaincodeID string, key string, hash uint32) {
testHasher.testHashFunctionInput[string(statemgmt.ConstructCompositeKey(chaincodeID, key))] = hash
}
func TestStateImpl_DB_Changes(t *testing.T) {
// number of buckets at each level 26,9,3,1
testHasher, stateImplTestWrapper, stateDelta := createFreshDBAndInitTestStateImplWithCustomHasher(t, 26, 3)
// populate hash fucntion such that
// ["chaincodeID1", "key1"] is bucketized to bucket 1
testHasher.populate("chaincodeID1", "key1", 0)
testHasher.populate("chaincodeID1", "key2", 0)
testHasher.populate("chaincodeID2", "key1", 1)
testHasher.populate("chaincodeID2", "key3", 3)
testHasher.populate("chaincodeID10", "key10", 24)
// prepare stateDelta
stateDelta.Set("chaincodeID1", "key1", []byte("value1"), nil)
stateDelta.Set("chaincodeID1", "key2", []byte("value2"), nil)
stateDelta.Set("chaincodeID2", "key1", []byte("value3"), nil)
stateDelta.Set("chaincodeID2", "key3", []byte("value4"), nil)
stateImplTestWrapper.prepareWorkingSetAndComputeCryptoHash(stateDelta)
stateImplTestWrapper.persistChangesAndResetInMemoryChanges()
// Read state from DB
testutil.AssertEquals(t, stateImplTestWrapper.get("chaincodeID1", "key1"), []byte("value1"))
testutil.AssertEquals(t, stateImplTestWrapper.get("chaincodeID2", "key1"), []byte("value3"))
// fetch datanode from DB
dataNodeFromDB, _ := fetchDataNodeFromDB(newDataKey("chaincodeID2", "key1"))
testutil.AssertEquals(t, dataNodeFromDB, newDataNode(newDataKey("chaincodeID2", "key1"), []byte("value3")))
//fetch non-existing data node from DB
dataNodeFromDB, _ = fetchDataNodeFromDB(newDataKey("chaincodeID10", "key10"))
t.Logf("isNIL...[%t]", dataNodeFromDB == nil)
testutil.AssertNil(t, dataNodeFromDB)
// fetch all data nodes from db that belong to bucket 1 at lowest level
dataNodesFromDB, _ := fetchDataNodesFromDBFor(newBucketKeyAtLowestLevel(1))
testutil.AssertContainsAll(t, dataNodesFromDB,
dataNodes{newDataNode(newDataKey("chaincodeID1", "key1"), []byte("value1")),
newDataNode(newDataKey("chaincodeID1", "key2"), []byte("value2"))})
// fetch all data nodes from db that belong to bucket 2 at lowest level
dataNodesFromDB, _ = fetchDataNodesFromDBFor(newBucketKeyAtLowestLevel(2))
testutil.AssertContainsAll(t, dataNodesFromDB,
dataNodes{newDataNode(newDataKey("chaincodeID2", "key1"), []byte("value3"))})
// fetch first bucket at second level
bucketNodeFromDB, _ := fetchBucketNodeFromDB(newBucketKey(2, 1))
testutil.AssertEquals(t, bucketNodeFromDB.bucketKey, newBucketKey(2, 1))
//check childrenCryptoHash entries in the bucket node from DB
testutil.AssertEquals(t, bucketNodeFromDB.childrenCryptoHash[0],
testutil.ComputeCryptoHash(statemgmt.ConstructCompositeKey("chaincodeID1", "key1"), []byte("value1"),
statemgmt.ConstructCompositeKey("chaincodeID1", "key2"), []byte("value2")))
testutil.AssertEquals(t, bucketNodeFromDB.childrenCryptoHash[1],
testutil.ComputeCryptoHash(statemgmt.ConstructCompositeKey("chaincodeID2", "key1"), []byte("value3")))
testutil.AssertNil(t, bucketNodeFromDB.childrenCryptoHash[2])
// third bucket at second level should be nil
bucketNodeFromDB, _ = fetchBucketNodeFromDB(newBucketKey(2, 3))
testutil.AssertNil(t, bucketNodeFromDB)
}
func TestStateImpl_ComputeHash_DB_2(t *testing.T) {
// number of buckets at each level 26,13,7,4,2,1
testHasher, stateImplTestWrapper, stateDelta := createFreshDBAndInitTestStateImplWithCustomHasher(t, 26, 2)
testHasher.populate("chaincodeID1", "key1", 0)
testHasher.populate("chaincodeID2", "key2", 1)
testHasher.populate("chaincodeID3", "key3", 5)
testHasher.populate("chaincodeID4", "key4", 9)
testHasher.populate("chaincodeID5", "key5", 24)
testHasher.populate("chaincodeID6", "key6", 25)
stateDelta.Set("chaincodeID1", "key1", []byte("value1"), nil)
stateDelta.Set("chaincodeID2", "key2", []byte("value2"), nil)
stateDelta.Set("chaincodeID3", "key3", []byte("value3"), nil)
stateDelta.Set("chaincodeID4", "key4", []byte("value4"), nil)
stateDelta.Set("chaincodeID5", "key5", []byte("value5"), nil)
stateDelta.Set("chaincodeID6", "key6", []byte("value6"), nil)
stateImplTestWrapper.prepareWorkingSet(stateDelta)
// Populate DB
stateImplTestWrapper.persistChangesAndResetInMemoryChanges()
//////////// Test - constrcuting a new state tree simulates starting state tree when db already has some data ////////
stateImplTestWrapper.constructNewStateImpl()
rootHash := stateImplTestWrapper.computeCryptoHash()
/*************************** bucket-tree-structure ***************
1 1 1 1 1 1
2 1 1 1 1 1
6 3 2 1 1 1
10 5 3 2 1 1
25 13 7 4 2 1
26 13 7 4 2 1
*******************************************************************/
expectedHashBucket5_1 := testutil.ComputeCryptoHash(statemgmt.ConstructCompositeKey("chaincodeID1", "key1"), []byte("value1"))
expectedHashBucket5_2 := testutil.ComputeCryptoHash(statemgmt.ConstructCompositeKey("chaincodeID2", "key2"), []byte("value2"))
expectedHashBucket5_6 := testutil.ComputeCryptoHash(statemgmt.ConstructCompositeKey("chaincodeID3", "key3"), []byte("value3"))
expectedHashBucket5_10 := testutil.ComputeCryptoHash(statemgmt.ConstructCompositeKey("chaincodeID4", "key4"), []byte("value4"))
expectedHashBucket5_25 := testutil.ComputeCryptoHash(statemgmt.ConstructCompositeKey("chaincodeID5", "key5"), []byte("value5"))
expectedHashBucket5_26 := testutil.ComputeCryptoHash(statemgmt.ConstructCompositeKey("chaincodeID6", "key6"), []byte("value6"))
expectedHashBucket4_1 := testutil.ComputeCryptoHash(expectedHashBucket5_1, expectedHashBucket5_2)
expectedHashBucket4_13 := testutil.ComputeCryptoHash(expectedHashBucket5_25, expectedHashBucket5_26)
expectedHashBucket2_1 := testutil.ComputeCryptoHash(expectedHashBucket4_1, expectedHashBucket5_6)
expectedHashBucket1_1 := testutil.ComputeCryptoHash(expectedHashBucket2_1, expectedHashBucket5_10)
expectedHash := testutil.ComputeCryptoHash(expectedHashBucket1_1, expectedHashBucket4_13)
testutil.AssertEquals(t, rootHash, expectedHash)
////////////// Test - Add a few more keys (include keys in the existing buckes and new buckets) /////////////////////
stateDelta = statemgmt.NewStateDelta()
testHasher.populate("chaincodeID7", "key7", 1)
testHasher.populate("chaincodeID8", "key8", 7)
testHasher.populate("chaincodeID9", "key9", 9)
testHasher.populate("chaincodeID10", "key10", 20)
stateDelta.Set("chaincodeID7", "key7", []byte("value7"), nil)
stateDelta.Set("chaincodeID8", "key8", []byte("value8"), nil)
stateDelta.Set("chaincodeID9", "key9", []byte("value9"), nil)
stateDelta.Set("chaincodeID10", "key10", []byte("value10"), nil)
/*************************** bucket-tree-structure after adding keys ***************
1 1 1 1 1 1
2 1 1 1 1 1
6 3 2 1 1 1
8 4 2 1 1 1
10 5 3 2 1 1
21 11 6 3 2 1
25 13 7 4 2 1
26 13 7 4 2 1
***********************************************************************************/
rootHash = stateImplTestWrapper.prepareWorkingSetAndComputeCryptoHash(stateDelta)
expectedHashBucket5_2 = testutil.ComputeCryptoHash(statemgmt.ConstructCompositeKey("chaincodeID2", "key2"), []byte("value2"),
statemgmt.ConstructCompositeKey("chaincodeID7", "key7"), []byte("value7"))
expectedHashBucket5_8 := testutil.ComputeCryptoHash(statemgmt.ConstructCompositeKey("chaincodeID8", "key8"), []byte("value8"))
expectedHashBucket5_10 = testutil.ComputeCryptoHash(statemgmt.ConstructCompositeKey("chaincodeID4", "key4"), []byte("value4"),
statemgmt.ConstructCompositeKey("chaincodeID9", "key9"), []byte("value9"))
expectedHashBucket5_21 := testutil.ComputeCryptoHash(statemgmt.ConstructCompositeKey("chaincodeID10", "key10"), []byte("value10"))
expectedHashBucket4_1 = testutil.ComputeCryptoHash(expectedHashBucket5_1, expectedHashBucket5_2)
expectedHashBucket3_2 := testutil.ComputeCryptoHash(expectedHashBucket5_6, expectedHashBucket5_8)
expectedHashBucket2_1 = testutil.ComputeCryptoHash(expectedHashBucket4_1, expectedHashBucket3_2)
expectedHashBucket1_1 = testutil.ComputeCryptoHash(expectedHashBucket2_1, expectedHashBucket5_10)
expectedHashBucket1_2 := testutil.ComputeCryptoHash(expectedHashBucket5_21, expectedHashBucket4_13)
expectedHash = testutil.ComputeCryptoHash(expectedHashBucket1_1, expectedHashBucket1_2)
testutil.AssertEquals(t, rootHash, expectedHash)
stateImplTestWrapper.persistChangesAndResetInMemoryChanges()
////////////// Test - overwrite an existing key /////////////////////
stateDelta = statemgmt.NewStateDelta()
stateDelta.Set("chaincodeID7", "key7", []byte("value7_new"), nil)
rootHash = stateImplTestWrapper.prepareWorkingSetAndComputeCryptoHash(stateDelta)
expectedHashBucket5_2 = testutil.ComputeCryptoHash(statemgmt.ConstructCompositeKey("chaincodeID2", "key2"), []byte("value2"),
statemgmt.ConstructCompositeKey("chaincodeID7", "key7"), []byte("value7_new"))
expectedHashBucket4_1 = testutil.ComputeCryptoHash(expectedHashBucket5_1, expectedHashBucket5_2)
expectedHashBucket2_1 = testutil.ComputeCryptoHash(expectedHashBucket4_1, expectedHashBucket3_2)
expectedHashBucket1_1 = testutil.ComputeCryptoHash(expectedHashBucket2_1, expectedHashBucket5_10)
expectedHash = testutil.ComputeCryptoHash(expectedHashBucket1_1, expectedHashBucket1_2)
testutil.AssertEquals(t, rootHash, expectedHash)
stateImplTestWrapper.persistChangesAndResetInMemoryChanges()
testutil.AssertEquals(t, stateImplTestWrapper.get("chaincodeID7", "key7"), []byte("value7_new"))
////////////// Test - delete an existing key /////////////////////
stateDelta = statemgmt.NewStateDelta()
stateDelta.Delete("chaincodeID2", "key2", nil)
rootHash = stateImplTestWrapper.prepareWorkingSetAndComputeCryptoHash(stateDelta)
expectedHashBucket5_2 = testutil.ComputeCryptoHash(statemgmt.ConstructCompositeKey("chaincodeID7", "key7"), []byte("value7_new"))
expectedHashBucket4_1 = testutil.ComputeCryptoHash(expectedHashBucket5_1, expectedHashBucket5_2)
expectedHashBucket2_1 = testutil.ComputeCryptoHash(expectedHashBucket4_1, expectedHashBucket3_2)
expectedHashBucket1_1 = testutil.ComputeCryptoHash(expectedHashBucket2_1, expectedHashBucket5_10)
expectedHash = testutil.ComputeCryptoHash(expectedHashBucket1_1, expectedHashBucket1_2)
testutil.AssertEquals(t, rootHash, expectedHash)
stateImplTestWrapper.persistChangesAndResetInMemoryChanges()
testutil.AssertNil(t, stateImplTestWrapper.get("chaincodeID2", "key2"))
}
func TestStateImpl_ComputeHash_DB_1(t *testing.T) {
// number of buckets at each level 26,9,3,1
testHasher, stateImplTestWrapper, stateDelta := createFreshDBAndInitTestStateImplWithCustomHasher(t, 26, 3)
// populate hash fucntion such that
// all keys belong to a single bucket so as to test overwrite/delete scenario
testHasher.populate("chaincodeID1", "key1", 3)
testHasher.populate("chaincodeID2", "key2", 3)
testHasher.populate("chaincodeID3", "key3", 3)
testHasher.populate("chaincodeID4", "key4", 3)
testHasher.populate("chaincodeID5", "key5", 3)
testHasher.populate("chaincodeID6", "key6", 3)
testHasher.populate("chaincodeID7", "key7", 3)
stateDelta.Set("chaincodeID2", "key2", []byte("value2"), nil)
stateDelta.Set("chaincodeID3", "key3", []byte("value3"), nil)
stateDelta.Set("chaincodeID5", "key5", []byte("value5"), nil)
stateDelta.Set("chaincodeID6", "key6", []byte("value6"), nil)
rootHash := stateImplTestWrapper.prepareWorkingSetAndComputeCryptoHash(stateDelta)
stateImplTestWrapper.persistChangesAndResetInMemoryChanges()
expectedHash1 := testutil.ComputeCryptoHash(statemgmt.ConstructCompositeKey("chaincodeID2", "key2"), []byte("value2"),
statemgmt.ConstructCompositeKey("chaincodeID3", "key3"), []byte("value3"),
statemgmt.ConstructCompositeKey("chaincodeID5", "key5"), []byte("value5"),
statemgmt.ConstructCompositeKey("chaincodeID6", "key6"), []byte("value6"))
testutil.AssertEquals(t, rootHash, expectedHash1)
// modify boundary keys and a middle key
stateDelta = statemgmt.NewStateDelta()
stateDelta.Set("chaincodeID2", "key2", []byte("value2_new"), nil)
stateDelta.Set("chaincodeID3", "key3", []byte("value3_new"), nil)
stateDelta.Set("chaincodeID6", "key6", []byte("value6_new"), nil)
rootHash = stateImplTestWrapper.prepareWorkingSetAndComputeCryptoHash(stateDelta)
stateImplTestWrapper.persistChangesAndResetInMemoryChanges()
expectedHash2 := testutil.ComputeCryptoHash(statemgmt.ConstructCompositeKey("chaincodeID2", "key2"), []byte("value2_new"),
statemgmt.ConstructCompositeKey("chaincodeID3", "key3"), []byte("value3_new"),
statemgmt.ConstructCompositeKey("chaincodeID5", "key5"), []byte("value5"),
statemgmt.ConstructCompositeKey("chaincodeID6", "key6"), []byte("value6_new"))
testutil.AssertEquals(t, rootHash, expectedHash2)
testutil.AssertEquals(t, stateImplTestWrapper.get("chaincodeID2", "key2"), []byte("value2_new"))
testutil.AssertEquals(t, stateImplTestWrapper.get("chaincodeID3", "key3"), []byte("value3_new"))
testutil.AssertEquals(t, stateImplTestWrapper.get("chaincodeID6", "key6"), []byte("value6_new"))
// insert keys at boundary and in the middle
stateDelta = statemgmt.NewStateDelta()
stateDelta.Set("chaincodeID1", "key1", []byte("value1"), nil)
stateDelta.Set("chaincodeID4", "key4", []byte("value4"), nil)
stateDelta.Set("chaincodeID7", "key7", []byte("value7"), nil)
rootHash = stateImplTestWrapper.prepareWorkingSetAndComputeCryptoHash(stateDelta)
stateImplTestWrapper.persistChangesAndResetInMemoryChanges()
expectedHash3 := testutil.ComputeCryptoHash(statemgmt.ConstructCompositeKey("chaincodeID1", "key1"), []byte("value1"),
statemgmt.ConstructCompositeKey("chaincodeID2", "key2"), []byte("value2_new"),
statemgmt.ConstructCompositeKey("chaincodeID3", "key3"), []byte("value3_new"),
statemgmt.ConstructCompositeKey("chaincodeID4", "key4"), []byte("value4"),
statemgmt.ConstructCompositeKey("chaincodeID5", "key5"), []byte("value5"),
statemgmt.ConstructCompositeKey("chaincodeID6", "key6"), []byte("value6_new"),
statemgmt.ConstructCompositeKey("chaincodeID7", "key7"), []byte("value7"))
testutil.AssertEquals(t, rootHash, expectedHash3)
testutil.AssertEquals(t, stateImplTestWrapper.get("chaincodeID1", "key1"), []byte("value1"))
testutil.AssertEquals(t, stateImplTestWrapper.get("chaincodeID4", "key4"), []byte("value4"))
testutil.AssertEquals(t, stateImplTestWrapper.get("chaincodeID7", "key7"), []byte("value7"))
// delete keys at a boundary and in the middle
stateDelta = statemgmt.NewStateDelta()
stateDelta.Delete("chaincodeID1", "key1", nil)
stateDelta.Delete("chaincodeID4", "key4", nil)
stateDelta.Delete("chaincodeID7", "key7", nil)
rootHash = stateImplTestWrapper.prepareWorkingSetAndComputeCryptoHash(stateDelta)
stateImplTestWrapper.persistChangesAndResetInMemoryChanges()
testutil.AssertEquals(t, rootHash, expectedHash2)
testutil.AssertNil(t, stateImplTestWrapper.get("chaincodeID1", "key1"))
testutil.AssertNil(t, stateImplTestWrapper.get("chaincodeID4", "key4"))
testutil.AssertNil(t, stateImplTestWrapper.get("chaincodeID7", "key7"))
}
func newTrieKey(chaincodeID string, key string) *trieKey {
compositeKey := statemgmt.ConstructCompositeKey(chaincodeID, key)
return newTrieKeyFromCompositeKey(compositeKey)
}
// Get - method implementation for interface 'statemgmt.HashableState'
func (impl *StateImpl) Get(chaincodeID string, key string) ([]byte, error) {
compositeKey := statemgmt.ConstructCompositeKey(chaincodeID, key)
openchainDB := db.GetDBHandle()
return openchainDB.GetFromStateCF(compositeKey)
}
func minimumPossibleDataKeyBytes(bucketNumber int, chaincodeID string, key string) []byte {
b := encodeBucketNumber(bucketNumber)
b = append(b, statemgmt.ConstructCompositeKey(chaincodeID, key)...)
return b
}