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validator.go
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validator.go
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/*
Copyright IBM Corp. 2016 All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package txvalidator
import (
"context"
"fmt"
"time"
"github.com/golang/protobuf/proto"
"github.com/hyperledger/fabric/common/channelconfig"
"github.com/hyperledger/fabric/common/configtx"
commonerrors "github.com/hyperledger/fabric/common/errors"
"github.com/hyperledger/fabric/common/flogging"
"github.com/hyperledger/fabric/core/chaincode/platforms"
"github.com/hyperledger/fabric/core/chaincode/platforms/golang"
"github.com/hyperledger/fabric/core/common/sysccprovider"
"github.com/hyperledger/fabric/core/common/validation"
"github.com/hyperledger/fabric/core/ledger"
ledgerUtil "github.com/hyperledger/fabric/core/ledger/util"
"github.com/hyperledger/fabric/msp"
"github.com/hyperledger/fabric/protos/common"
mspprotos "github.com/hyperledger/fabric/protos/msp"
"github.com/hyperledger/fabric/protos/peer"
"github.com/hyperledger/fabric/protos/utils"
"github.com/pkg/errors"
)
// Support provides all of the needed to evaluate the VSCC
type Support interface {
// Acquire implements semaphore-like acquire semantics
Acquire(ctx context.Context, n int64) error
// Release implements semaphore-like release semantics
Release(n int64)
// Ledger returns the ledger associated with this validator
Ledger() ledger.PeerLedger
// MSPManager returns the MSP manager for this channel
MSPManager() msp.MSPManager
// Apply attempts to apply a configtx to become the new config
Apply(configtx *common.ConfigEnvelope) error
// GetMSPIDs returns the IDs for the application MSPs
// that have been defined in the channel
GetMSPIDs(cid string) []string
// Capabilities defines the capabilities for the application portion of this channel
Capabilities() channelconfig.ApplicationCapabilities
}
//Validator interface which defines API to validate block transactions
// and return the bit array mask indicating invalid transactions which
// didn't pass validation.
type Validator interface {
Validate(block *common.Block) error
}
// private interface to decouple tx validator
// and vscc execution, in order to increase
// testability of TxValidator
type vsccValidator interface {
VSCCValidateTx(seq int, payload *common.Payload, envBytes []byte, block *common.Block) (error, peer.TxValidationCode)
}
// implementation of Validator interface, keeps
// reference to the ledger to enable tx simulation
// and execution of vscc
type TxValidator struct {
ChainID string
Support Support
Vscc vsccValidator
}
var logger = flogging.MustGetLogger("committer/txvalidator")
type blockValidationRequest struct {
block *common.Block
d []byte
tIdx int
}
type blockValidationResult struct {
tIdx int
validationCode peer.TxValidationCode
txsChaincodeName *sysccprovider.ChaincodeInstance
txsUpgradedChaincode *sysccprovider.ChaincodeInstance
err error
txid string
}
// NewTxValidator creates new transactions validator
func NewTxValidator(chainID string, support Support, sccp sysccprovider.SystemChaincodeProvider, pm PluginMapper) *TxValidator {
// Encapsulates interface implementation
pluginValidator := NewPluginValidator(pm, support.Ledger(), &dynamicDeserializer{support: support}, &dynamicCapabilities{support: support})
return &TxValidator{
ChainID: chainID,
Support: support,
Vscc: newVSCCValidator(chainID, support, sccp, pluginValidator)}
}
func (v *TxValidator) chainExists(chain string) bool {
// TODO: implement this function!
return true
}
// Validate performs the validation of a block. The validation
// of each transaction in the block is performed in parallel.
// The approach is as follows: the committer thread starts the
// tx validation function in a goroutine (using a semaphore to cap
// the number of concurrent validating goroutines). The committer
// thread then reads results of validation (in orderer of completion
// of the goroutines) from the results channel. The goroutines
// perform the validation of the txs in the block and enqueue the
// validation result in the results channel. A few note-worthy facts:
// 1) to keep the approach simple, the committer thread enqueues
// all transactions in the block and then moves on to reading the
// results.
// 2) for parallel validation to work, it is important that the
// validation function does not change the state of the system.
// Otherwise the order in which validation is perform matters
// and we have to resort to sequential validation (or some locking).
// This is currently true, because the only function that affects
// state is when a config transaction is received, but they are
// guaranteed to be alone in the block. If/when this assumption
// is violated, this code must be changed.
func (v *TxValidator) Validate(block *common.Block) error {
var err error
var errPos int
startValidation := time.Now() // timer to log Validate block duration
logger.Debugf("[%s] START Block Validation for block [%d]", v.ChainID, block.Header.Number)
// Initialize trans as valid here, then set invalidation reason code upon invalidation below
txsfltr := ledgerUtil.NewTxValidationFlags(len(block.Data.Data))
// txsChaincodeNames records all the invoked chaincodes by tx in a block
txsChaincodeNames := make(map[int]*sysccprovider.ChaincodeInstance)
// upgradedChaincodes records all the chaincodes that are upgraded in a block
txsUpgradedChaincodes := make(map[int]*sysccprovider.ChaincodeInstance)
// array of txids
txidArray := make([]string, len(block.Data.Data))
results := make(chan *blockValidationResult)
go func() {
for tIdx, d := range block.Data.Data {
// ensure that we don't have too many concurrent validation workers
v.Support.Acquire(context.Background(), 1)
go func(index int, data []byte) {
defer v.Support.Release(1)
v.validateTx(&blockValidationRequest{
d: data,
block: block,
tIdx: index,
}, results)
}(tIdx, d)
}
}()
logger.Debugf("expecting %d block validation responses", len(block.Data.Data))
// now we read responses in the order in which they come back
for i := 0; i < len(block.Data.Data); i++ {
res := <-results
if res.err != nil {
// if there is an error, we buffer its value, wait for
// all workers to complete validation and then return
// the error from the first tx in this block that returned an error
logger.Debugf("got terminal error %s for idx %d", res.err, res.tIdx)
if err == nil || res.tIdx < errPos {
err = res.err
errPos = res.tIdx
}
} else {
// if there was no error, we set the txsfltr and we set the
// txsChaincodeNames and txsUpgradedChaincodes maps
logger.Debugf("got result for idx %d, code %d", res.tIdx, res.validationCode)
txsfltr.SetFlag(res.tIdx, res.validationCode)
if res.validationCode == peer.TxValidationCode_VALID {
if res.txsChaincodeName != nil {
txsChaincodeNames[res.tIdx] = res.txsChaincodeName
}
if res.txsUpgradedChaincode != nil {
txsUpgradedChaincodes[res.tIdx] = res.txsUpgradedChaincode
}
txidArray[res.tIdx] = res.txid
}
}
}
// if we're here, all workers have completed the validation.
// If there was an error we return the error from the first
// tx in this block that returned an error
if err != nil {
return err
}
// if we operate with this capability, we mark invalid any transaction that has a txid
// which is equal to that of a previous tx in this block
if v.Support.Capabilities().ForbidDuplicateTXIdInBlock() {
markTXIdDuplicates(txidArray, txsfltr)
}
// if we're here, all workers have completed validation and
// no error was reported; we set the tx filter and return
// success
v.invalidTXsForUpgradeCC(txsChaincodeNames, txsUpgradedChaincodes, txsfltr)
// make sure no transaction has skipped validation
err = v.allValidated(txsfltr, block)
if err != nil {
return err
}
// Initialize metadata structure
utils.InitBlockMetadata(block)
block.Metadata.Metadata[common.BlockMetadataIndex_TRANSACTIONS_FILTER] = txsfltr
elapsedValidation := time.Since(startValidation) / time.Millisecond // duration in ms
logger.Infof("[%s] Validated block [%d] in %dms", v.ChainID, block.Header.Number, elapsedValidation)
return nil
}
// allValidated returns error if some of the validation flags have not been set
// during validation
func (v *TxValidator) allValidated(txsfltr ledgerUtil.TxValidationFlags, block *common.Block) error {
for id, f := range txsfltr {
if peer.TxValidationCode(f) == peer.TxValidationCode_NOT_VALIDATED {
return errors.Errorf("transaction %d in block %d has skipped validation", id, block.Header.Number)
}
}
return nil
}
func markTXIdDuplicates(txids []string, txsfltr ledgerUtil.TxValidationFlags) {
txidMap := make(map[string]struct{})
for id, txid := range txids {
if txid == "" {
continue
}
_, in := txidMap[txid]
if in {
logger.Error("Duplicate txid", txid, "found, skipping")
txsfltr.SetFlag(id, peer.TxValidationCode_DUPLICATE_TXID)
} else {
txidMap[txid] = struct{}{}
}
}
}
func (v *TxValidator) validateTx(req *blockValidationRequest, results chan<- *blockValidationResult) {
block := req.block
d := req.d
tIdx := req.tIdx
txID := ""
if d == nil {
results <- &blockValidationResult{
tIdx: tIdx,
}
return
}
if env, err := utils.GetEnvelopeFromBlock(d); err != nil {
logger.Warningf("Error getting tx from block: %+v", err)
results <- &blockValidationResult{
tIdx: tIdx,
validationCode: peer.TxValidationCode_INVALID_OTHER_REASON,
}
return
} else if env != nil {
// validate the transaction: here we check that the transaction
// is properly formed, properly signed and that the security
// chain binding proposal to endorsements to tx holds. We do
// NOT check the validity of endorsements, though. That's a
// job for VSCC below
logger.Debugf("[%s] validateTx starts for block %p env %p txn %d", v.ChainID, block, env, tIdx)
defer logger.Debugf("[%s] validateTx completes for block %p env %p txn %d", v.ChainID, block, env, tIdx)
var payload *common.Payload
var err error
var txResult peer.TxValidationCode
var txsChaincodeName *sysccprovider.ChaincodeInstance
var txsUpgradedChaincode *sysccprovider.ChaincodeInstance
if payload, txResult = validation.ValidateTransaction(env, v.Support.Capabilities()); txResult != peer.TxValidationCode_VALID {
logger.Errorf("Invalid transaction with index %d", tIdx)
results <- &blockValidationResult{
tIdx: tIdx,
validationCode: txResult,
}
return
}
chdr, err := utils.UnmarshalChannelHeader(payload.Header.ChannelHeader)
if err != nil {
logger.Warningf("Could not unmarshal channel header, err %s, skipping", err)
results <- &blockValidationResult{
tIdx: tIdx,
validationCode: peer.TxValidationCode_INVALID_OTHER_REASON,
}
return
}
channel := chdr.ChannelId
logger.Debugf("Transaction is for channel %s", channel)
if !v.chainExists(channel) {
logger.Errorf("Dropping transaction for non-existent channel %s", channel)
results <- &blockValidationResult{
tIdx: tIdx,
validationCode: peer.TxValidationCode_TARGET_CHAIN_NOT_FOUND,
}
return
}
if common.HeaderType(chdr.Type) == common.HeaderType_ENDORSER_TRANSACTION {
// Check duplicate transactions
txID = chdr.TxId
// GetTransactionByID will return:
_, err := v.Support.Ledger().GetTransactionByID(txID)
// 1) err == nil => there is already a tx in the ledger with the supplied id
if err == nil {
logger.Error("Duplicate transaction found, ", txID, ", skipping")
results <- &blockValidationResult{
tIdx: tIdx,
validationCode: peer.TxValidationCode_DUPLICATE_TXID,
}
return
}
// 2) err is not of type blkstorage.NotFoundInIndexErr => we could not verify whether a tx with the supplied id is in the ledger
if _, isNotFoundInIndexErrType := err.(ledger.NotFoundInIndexErr); !isNotFoundInIndexErrType {
logger.Errorf("Ledger failure while attempting to detect duplicate status for txid %s, err '%s'. Aborting", txID, err)
results <- &blockValidationResult{
tIdx: tIdx,
err: err,
}
return
}
// 3) err is of type blkstorage.NotFoundInIndexErr => there is no tx with the supplied id in the ledger
// Validate tx with vscc and policy
logger.Debug("Validating transaction vscc tx validate")
err, cde := v.Vscc.VSCCValidateTx(tIdx, payload, d, block)
if err != nil {
logger.Errorf("VSCCValidateTx for transaction txId = %s returned error: %s", txID, err)
switch err.(type) {
case *commonerrors.VSCCExecutionFailureError:
results <- &blockValidationResult{
tIdx: tIdx,
err: err,
}
return
case *commonerrors.VSCCInfoLookupFailureError:
results <- &blockValidationResult{
tIdx: tIdx,
err: err,
}
return
default:
results <- &blockValidationResult{
tIdx: tIdx,
validationCode: cde,
}
return
}
}
invokeCC, upgradeCC, err := v.getTxCCInstance(payload)
if err != nil {
logger.Errorf("Get chaincode instance from transaction txId = %s returned error: %+v", txID, err)
results <- &blockValidationResult{
tIdx: tIdx,
validationCode: peer.TxValidationCode_INVALID_OTHER_REASON,
}
return
}
txsChaincodeName = invokeCC
if upgradeCC != nil {
logger.Infof("Find chaincode upgrade transaction for chaincode %s on channel %s with new version %s", upgradeCC.ChaincodeName, upgradeCC.ChainID, upgradeCC.ChaincodeVersion)
txsUpgradedChaincode = upgradeCC
}
} else if common.HeaderType(chdr.Type) == common.HeaderType_CONFIG {
configEnvelope, err := configtx.UnmarshalConfigEnvelope(payload.Data)
if err != nil {
err = errors.WithMessage(err, "error unmarshalling config which passed initial validity checks")
logger.Criticalf("%+v", err)
results <- &blockValidationResult{
tIdx: tIdx,
err: err,
}
return
}
if err := v.Support.Apply(configEnvelope); err != nil {
err = errors.WithMessage(err, "error validating config which passed initial validity checks")
logger.Criticalf("%+v", err)
results <- &blockValidationResult{
tIdx: tIdx,
err: err,
}
return
}
logger.Debugf("config transaction received for chain %s", channel)
} else {
logger.Warningf("Unknown transaction type [%s] in block number [%d] transaction index [%d]",
common.HeaderType(chdr.Type), block.Header.Number, tIdx)
results <- &blockValidationResult{
tIdx: tIdx,
validationCode: peer.TxValidationCode_UNKNOWN_TX_TYPE,
}
return
}
if _, err := proto.Marshal(env); err != nil {
logger.Warningf("Cannot marshal transaction: %s", err)
results <- &blockValidationResult{
tIdx: tIdx,
validationCode: peer.TxValidationCode_MARSHAL_TX_ERROR,
}
return
}
// Succeeded to pass down here, transaction is valid
results <- &blockValidationResult{
tIdx: tIdx,
txsChaincodeName: txsChaincodeName,
txsUpgradedChaincode: txsUpgradedChaincode,
validationCode: peer.TxValidationCode_VALID,
txid: txID,
}
return
} else {
logger.Warning("Nil tx from block")
results <- &blockValidationResult{
tIdx: tIdx,
validationCode: peer.TxValidationCode_NIL_ENVELOPE,
}
return
}
}
// generateCCKey generates a unique identifier for chaincode in specific channel
func (v *TxValidator) generateCCKey(ccName, chainID string) string {
return fmt.Sprintf("%s/%s", ccName, chainID)
}
// invalidTXsForUpgradeCC invalid all txs that should be invalided because of chaincode upgrade txs
func (v *TxValidator) invalidTXsForUpgradeCC(txsChaincodeNames map[int]*sysccprovider.ChaincodeInstance, txsUpgradedChaincodes map[int]*sysccprovider.ChaincodeInstance, txsfltr ledgerUtil.TxValidationFlags) {
if len(txsUpgradedChaincodes) == 0 {
return
}
// Invalid former cc upgrade txs if there're two or more txs upgrade the same cc
finalValidUpgradeTXs := make(map[string]int)
upgradedChaincodes := make(map[string]*sysccprovider.ChaincodeInstance)
for tIdx, cc := range txsUpgradedChaincodes {
if cc == nil {
continue
}
upgradedCCKey := v.generateCCKey(cc.ChaincodeName, cc.ChainID)
if finalIdx, exist := finalValidUpgradeTXs[upgradedCCKey]; !exist {
finalValidUpgradeTXs[upgradedCCKey] = tIdx
upgradedChaincodes[upgradedCCKey] = cc
} else if finalIdx < tIdx {
logger.Infof("Invalid transaction with index %d: chaincode was upgraded by latter tx", finalIdx)
txsfltr.SetFlag(finalIdx, peer.TxValidationCode_CHAINCODE_VERSION_CONFLICT)
// record latter cc upgrade tx info
finalValidUpgradeTXs[upgradedCCKey] = tIdx
upgradedChaincodes[upgradedCCKey] = cc
} else {
logger.Infof("Invalid transaction with index %d: chaincode was upgraded by latter tx", tIdx)
txsfltr.SetFlag(tIdx, peer.TxValidationCode_CHAINCODE_VERSION_CONFLICT)
}
}
// invalid txs which invoke the upgraded chaincodes
for tIdx, cc := range txsChaincodeNames {
if cc == nil {
continue
}
ccKey := v.generateCCKey(cc.ChaincodeName, cc.ChainID)
if _, exist := upgradedChaincodes[ccKey]; exist {
if txsfltr.IsValid(tIdx) {
logger.Infof("Invalid transaction with index %d: chaincode was upgraded in the same block", tIdx)
txsfltr.SetFlag(tIdx, peer.TxValidationCode_CHAINCODE_VERSION_CONFLICT)
}
}
}
}
func (v *TxValidator) getTxCCInstance(payload *common.Payload) (invokeCCIns, upgradeCCIns *sysccprovider.ChaincodeInstance, err error) {
// This is duplicated unpacking work, but make test easier.
chdr, err := utils.UnmarshalChannelHeader(payload.Header.ChannelHeader)
if err != nil {
return nil, nil, err
}
// Chain ID
chainID := chdr.ChannelId // it is guaranteed to be an existing channel by now
// ChaincodeID
hdrExt, err := utils.GetChaincodeHeaderExtension(payload.Header)
if err != nil {
return nil, nil, err
}
invokeCC := hdrExt.ChaincodeId
invokeIns := &sysccprovider.ChaincodeInstance{ChainID: chainID, ChaincodeName: invokeCC.Name, ChaincodeVersion: invokeCC.Version}
// Transaction
tx, err := utils.GetTransaction(payload.Data)
if err != nil {
logger.Errorf("GetTransaction failed: %+v", err)
return invokeIns, nil, nil
}
// ChaincodeActionPayload
cap, err := utils.GetChaincodeActionPayload(tx.Actions[0].Payload)
if err != nil {
logger.Errorf("GetChaincodeActionPayload failed: %+v", err)
return invokeIns, nil, nil
}
// ChaincodeProposalPayload
cpp, err := utils.GetChaincodeProposalPayload(cap.ChaincodeProposalPayload)
if err != nil {
logger.Errorf("GetChaincodeProposalPayload failed: %+v", err)
return invokeIns, nil, nil
}
// ChaincodeInvocationSpec
cis := &peer.ChaincodeInvocationSpec{}
err = proto.Unmarshal(cpp.Input, cis)
if err != nil {
logger.Errorf("GetChaincodeInvokeSpec failed: %+v", err)
return invokeIns, nil, nil
}
if invokeCC.Name == "lscc" {
if string(cis.ChaincodeSpec.Input.Args[0]) == "upgrade" {
upgradeIns, err := v.getUpgradeTxInstance(chainID, cis.ChaincodeSpec.Input.Args[2])
if err != nil {
return invokeIns, nil, nil
}
return invokeIns, upgradeIns, nil
}
}
return invokeIns, nil, nil
}
func (v *TxValidator) getUpgradeTxInstance(chainID string, cdsBytes []byte) (*sysccprovider.ChaincodeInstance, error) {
cds, err := utils.GetChaincodeDeploymentSpec(cdsBytes, platforms.NewRegistry(&golang.Platform{}))
if err != nil {
return nil, err
}
return &sysccprovider.ChaincodeInstance{
ChainID: chainID,
ChaincodeName: cds.ChaincodeSpec.ChaincodeId.Name,
ChaincodeVersion: cds.ChaincodeSpec.ChaincodeId.Version,
}, nil
}
type dynamicDeserializer struct {
support Support
}
func (ds *dynamicDeserializer) DeserializeIdentity(serializedIdentity []byte) (msp.Identity, error) {
return ds.support.MSPManager().DeserializeIdentity(serializedIdentity)
}
func (ds *dynamicDeserializer) IsWellFormed(identity *mspprotos.SerializedIdentity) error {
return ds.support.MSPManager().IsWellFormed(identity)
}
type dynamicCapabilities struct {
support Support
}
func (ds *dynamicCapabilities) ACLs() bool {
return ds.support.Capabilities().ACLs()
}
func (ds *dynamicCapabilities) CollectionUpgrade() bool {
return ds.support.Capabilities().CollectionUpgrade()
}
func (ds *dynamicCapabilities) ForbidDuplicateTXIdInBlock() bool {
return ds.support.Capabilities().ForbidDuplicateTXIdInBlock()
}
func (ds *dynamicCapabilities) KeyLevelEndorsement() bool {
return ds.support.Capabilities().KeyLevelEndorsement()
}
func (ds *dynamicCapabilities) MetadataLifecycle() bool {
return ds.support.Capabilities().MetadataLifecycle()
}
func (ds *dynamicCapabilities) PrivateChannelData() bool {
return ds.support.Capabilities().PrivateChannelData()
}
func (ds *dynamicCapabilities) Supported() error {
return ds.support.Capabilities().Supported()
}
func (ds *dynamicCapabilities) V1_1Validation() bool {
return ds.support.Capabilities().V1_1Validation()
}
func (ds *dynamicCapabilities) V1_2Validation() bool {
return ds.support.Capabilities().V1_2Validation()
}
func (ds *dynamicCapabilities) V1_3Validation() bool {
return ds.support.Capabilities().V1_3Validation()
}