[FAB-7224] Enhance custom tx processor

This CR enhances custom transaction processor in ledger such that
the processor is able to distinguish whether it is being invoked
during ledger initialization or for on-line tx processing.

In the former situation, the processor needs to just rely on the
states stored previously in the ledger and in the latter it can assume that
the peer is up and running and hence other peer structures can be used.

Other than this, in the initialization situation only valid transactions are
passed to the processor which makes the custom validation in the processor
optional.

Change-Id: Idff54ab124dd588dfa5172a5b882e521217ca62a
Signed-off-by: manish <manish.sethi@gmail.com>

Author: manish-sethi

core/aclmgmt/aclmgmt.go

@@ -75,14 +75,14 @@ var aclMgmtCfgTxProcessor = &AclMgmtConfigTxProcessor{}
 
 //GenerateSimulationResults this is just a proxy to delegate registered aclProvider.
 //Need this as aclmgmt is initialized with ledger initialization as required by ledger
-func (*AclMgmtConfigTxProcessor) GenerateSimulationResults(txEnvelop *common.Envelope, simulator ledger.TxSimulator) error {
+func (*AclMgmtConfigTxProcessor) GenerateSimulationResults(txEnvelop *common.Envelope, simulator ledger.TxSimulator, initializingLedger bool) error {
 	configtxLock.RLock()
 	defer configtxLock.RUnlock()
 
 	//this should not be nil (aclProvider is initialized at the outset to either
 	//rscc or default)
 	if aclProvider != nil {
-		return aclProvider.GenerateSimulationResults(txEnvelop, simulator)
+		return aclProvider.GenerateSimulationResults(txEnvelop, simulator, initializingLedger)
 	}
 
 	return fmt.Errorf("warning! call to handle config tx before setting ACL provider")

core/aclmgmt/aclmgmt_test.go

@@ -35,9 +35,9 @@ func registerACLProvider() *mocks.MockACLProvider {
 
 func TestACLProcessor(t *testing.T) {
 	reinit()
-	assert.NotNil(t, GetConfigTxProcessor().GenerateSimulationResults(nil, nil), "Expected non-nil error")
+	assert.NotNil(t, GetConfigTxProcessor().GenerateSimulationResults(nil, nil, false), "Expected non-nil error")
 	RegisterACLProvider(nil)
-	assert.Nil(t, GetConfigTxProcessor().GenerateSimulationResults(nil, nil), "Expected nil error")
+	assert.Nil(t, GetConfigTxProcessor().GenerateSimulationResults(nil, nil, false), "Expected nil error")
 }
 
 func TestPanicOnUnregistered(t *testing.T) {

core/aclmgmt/aclmgmtimpl.go

@@ -51,10 +51,10 @@ func newACLMgmt(r ACLProvider) ACLProvider {
 	return &aclMgmtImpl{aclOverrides: make(map[string]aclMethod)}
 }
 
-func (am *aclMgmtImpl) GenerateSimulationResults(txEnvelop *common.Envelope, simulator ledger.TxSimulator) error {
+func (am *aclMgmtImpl) GenerateSimulationResults(txEnvelop *common.Envelope, simulator ledger.TxSimulator, initializingLedger bool) error {
 	if rscc == nil {
 		panic("-----RegisterACLProvider not called ----")
 	}
 
-	return rscc.GenerateSimulationResults(txEnvelop, simulator)
+	return rscc.GenerateSimulationResults(txEnvelop, simulator, initializingLedger)
 }

core/aclmgmt/defaultaclprovider.go

@@ -124,6 +124,6 @@ func (d *defaultACLProvider) CheckACL(resName string, channelID string, idinfo i
 
 //GenerateSimulationResults does nothing for default provider currently as it defaults to
 //1.0 behavior
-func (d *defaultACLProvider) GenerateSimulationResults(txEnvelop *common.Envelope, simulator ledger.TxSimulator) error {
+func (d *defaultACLProvider) GenerateSimulationResults(txEnvelop *common.Envelope, simulator ledger.TxSimulator, initializingLedger bool) error {
 	return nil
 }

core/aclmgmt/mocks/mocks.go

@@ -30,7 +30,7 @@ func (m *MockACLProvider) CheckACL(resName string, channelID string, idinfo inte
 	return args.Error(0)
 }
 
-func (m *MockACLProvider) GenerateSimulationResults(txEnvelop *common.Envelope, simulator ledger.TxSimulator) error {
+func (m *MockACLProvider) GenerateSimulationResults(txEnvelop *common.Envelope, simulator ledger.TxSimulator, initializingLedger bool) error {
 	return nil
 }
 

core/ledger/customtx/custom_tx_processor.go

@@ -9,7 +9,6 @@ package customtx
 import (
 	"sync"
 
-	"github.com/hyperledger/fabric/core/ledger"
 	"github.com/hyperledger/fabric/protos/common"
 )
 
@@ -19,15 +18,6 @@ var once sync.Once
 // Processors maintains the association between a custom transaction type to its corresponding tx processor
 type Processors map[common.HeaderType]Processor
 
-// Processor allows to generate simulation results during commit time for custom transactions.
-// A custom processor may represent the information in a propriety fashion and can use this process to translate
-// the information into the form of `TxSimulationResults`. Because, the original information is signed in a
-// custom representation, an implementation of a `Processor` should be cautious that the custom representation
-// is used for simulation in an deterministic fashion and should take care of compatibility cross fabric versions.
-type Processor interface {
-	GenerateSimulationResults(txEnvelop *common.Envelope, simulator ledger.TxSimulator) error
-}
-
 // Initialize sets the custom processors. This function is expected to be invoked only during ledgermgmt.Initialize() function.
 func Initialize(customTxProcessors Processors) {
 	once.Do(func() {

core/ledger/customtx/interface.go

@@ -0,0 +1,35 @@
+/*
+Copyright IBM Corp. All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package customtx
+
+import (
+	"github.com/hyperledger/fabric/core/ledger"
+	"github.com/hyperledger/fabric/protos/common"
+)
+
+// InvalidTxError is expected to be thrown by a custom transaction processor (an implementation of interface `Processor`)
+// if it wants the ledger to record a particular transaction as invalid
+type InvalidTxError struct {
+	Msg string
+}
+
+func (e *InvalidTxError) Error() string {
+	return e.Msg
+}
+
+// Processor allows to generate simulation results during commit time for custom transactions.
+// A custom processor may represent the information in a propriety fashion and can use this process to translate
+// the information into the form of `TxSimulationResults`. Because, the original information is signed in a
+// custom representation, an implementation of a `Processor` should be cautious that the custom representation
+// is used for simulation in an deterministic fashion and should take care of compatibility cross fabric versions.
+// 'initializingLedger' true indicates that either the transaction being processed is from the genesis block or the ledger is
+// synching the state (which could happen during peer startup if the statedb is found to be lagging behind the blockchain).
+// In the former case, the transactions processed are expected to be valid and in the latter case, only valid transactions
+// are reprocessed and hence any validation can be skipped.
+type Processor interface {
+	GenerateSimulationResults(txEnvelop *common.Envelope, simulator ledger.TxSimulator, initializingLedger bool) error
+}

core/ledger/customtx/test_export.go

@@ -0,0 +1,12 @@
+/*
+Copyright IBM Corp. All Rights Reserved.
+
+SPDX-License-Identifier: Apache-2.0
+*/
+
+package customtx
+
+// InitializeTestEnv initializes custom tx processors for test
+func InitializeTestEnv(processors Processors) {
+	initialize(processors)
+}

core/ledger/kvledger/custom_processor_test.go

@@ -9,24 +9,35 @@ package kvledger
 import (
 	"testing"
 
+	"github.com/golang/protobuf/proto"
+	"github.com/hyperledger/fabric/protos/ledger/rwset/kvrwset"
+	"github.com/hyperledger/fabric/protos/peer"
+
 	"github.com/hyperledger/fabric/common/ledger/testutil"
+	lgrutil "github.com/hyperledger/fabric/core/ledger/util"
+
 	"github.com/hyperledger/fabric/core/ledger"
 	"github.com/hyperledger/fabric/core/ledger/customtx"
 	"github.com/hyperledger/fabric/protos/common"
+	"github.com/hyperledger/fabric/protos/utils"
 	"github.com/stretchr/testify/assert"
 )
 
 type customTxProcessor struct {
-	namespace string
-	initData  map[string][]byte
 }
 
-func (ctp *customTxProcessor) GenerateSimulationResults(
-	txEnvelop *common.Envelope, simulator ledger.TxSimulator) error {
-	for k, v := range ctp.initData {
-		simulator.SetState(ctp.namespace, k, []byte(v))
+func (ctp *customTxProcessor) GenerateSimulationResults(txEnvelop *common.Envelope, simulator ledger.TxSimulator, initializingLedger bool) error {
+	payload := utils.UnmarshalPayloadOrPanic(txEnvelop.Payload)
+	chHdr, _ := utils.UnmarshalChannelHeader(payload.Header.ChannelHeader)
+	chainid := chHdr.ChannelId
+	kvw := &kvrwset.KVWrite{}
+	if err := proto.Unmarshal(payload.Data, kvw); err != nil {
+		return err
 	}
-	return nil
+	if len(kvw.Key) == 0 {
+		return &customtx.InvalidTxError{Msg: "Nil key"}
+	}
+	return simulator.SetState(chainid, kvw.Key, kvw.Value)
 }
 
 func TestCustomProcessor(t *testing.T) {
@@ -35,27 +46,59 @@ func TestCustomProcessor(t *testing.T) {
 	provider, _ := NewProvider()
 	defer provider.Close()
 
-	// create a custom tx processor and register it to handle 'common.HeaderType_CONFIG' type of transaction
-	testNamespace := "TestNamespace"
-	testKVs := map[string][]byte{"one": []byte("1"), "two": []byte("2")}
-	customtx.Initialize(customtx.Processors{
-		common.HeaderType_CONFIG: &customTxProcessor{
-			testNamespace,
-			testKVs,
-		}})
+	// create a custom tx processor and register it to handle '100 and 101' type of transaction
+	chainid := "testLedger"
+	customTxProcessor := &customTxProcessor{}
+	customtx.InitializeTestEnv(customtx.Processors{
+		100: customTxProcessor,
+		101: customTxProcessor})
 
 	// Create a genesis block with a common.HeaderType_CONFIG transaction
-	_, gb := testutil.NewBlockGenerator(t, "testLedger", false)
-	ledger, err := provider.Create(gb)
-	defer ledger.Close()
+	_, gb := testutil.NewBlockGenerator(t, chainid, false)
+	lgr, err := provider.Create(gb)
+	defer lgr.Close()
 	assert.NoError(t, err)
 
+	// commit a block with three custom trans
+	tx1 := createCustomTx(t, 100, chainid, "custom_key1", "value1")
+	tx2 := createCustomTx(t, 101, chainid, "custom_key2", "value2")
+	tx3 := createCustomTx(t, 101, chainid, "", "")
+	blk1 := testutil.NewBlock([]*common.Envelope{tx1, tx2, tx3}, 1, gb.Header.Hash())
+	assert.NoError(t, lgr.CommitWithPvtData(&ledger.BlockAndPvtData{Block: blk1}))
 	// verify that the state changes caused by the custom processor took place during ledger creation
-	txSim, err := ledger.NewTxSimulator("testTxid")
+	qe, err := lgr.NewQueryExecutor()
 	assert.NoError(t, err)
-	for k, v := range testKVs {
-		value, err := txSim.GetState(testNamespace, k)
-		assert.NoError(t, err)
-		assert.Equal(t, v, value)
-	}
+	val, err := qe.GetState(chainid, "custom_key1")
+	assert.NoError(t, err)
+	assert.Equal(t, "value1", string(val))
+
+	val, err = qe.GetState(chainid, "custom_key2")
+	assert.NoError(t, err)
+	assert.Equal(t, "value2", string(val))
+	qe.Done()
+
+	blockPersisted, err := lgr.GetBlockByNumber(1)
+	assert.NoError(t, err)
+	var txFilter lgrutil.TxValidationFlags
+	txFilter = blockPersisted.Metadata.Metadata[common.BlockMetadataIndex_TRANSACTIONS_FILTER]
+	assert.Equal(t, peer.TxValidationCode_VALID, txFilter.Flag(0))
+	assert.Equal(t, peer.TxValidationCode_VALID, txFilter.Flag(1))
+	assert.Equal(t, peer.TxValidationCode_INVALID_OTHER_REASON, txFilter.Flag(2))
+
+	tx4 := createCustomTx(t, 100, chainid, "custom_key4", "value4")
+	blk2 := testutil.NewBlock([]*common.Envelope{tx4}, 2, blk1.Header.Hash())
+	assert.NoError(t, lgr.CommitWithPvtData(&ledger.BlockAndPvtData{Block: blk2}))
+	qe, err = lgr.NewQueryExecutor()
+	assert.NoError(t, err)
+	val, err = qe.GetState(chainid, "custom_key4")
+	qe.Done()
+	assert.NoError(t, err)
+	assert.Equal(t, "value4", string(val))
+}
+
+func createCustomTx(t *testing.T, txType common.HeaderType, chainid, key, val string) *common.Envelope {
+	kvWrite := &kvrwset.KVWrite{Key: key, Value: []byte(val)}
+	txEnv, err := utils.CreateSignedEnvelope(txType, chainid, nil, kvWrite, 0, 0)
+	assert.NoError(t, err)
+	return txEnv
 }

core/ledger/kvledger/txmgmt/validator/valimpl/default_impl.go

@@ -44,7 +44,7 @@ func (impl *DefaultImpl) ValidateAndPrepareBatch(blockAndPvtdata *ledger.BlockAn
 	var err error
 
 	logger.Debug("preprocessing ProtoBlock...")
-	if internalBlock, err = preprocessProtoBlock(impl.txmgr, block); err != nil {
+	if internalBlock, err = preprocessProtoBlock(impl.txmgr, block, doMVCCValidation); err != nil {
 		return nil, err
 	}