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chainsupport.go
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/
chainsupport.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package multichannel
import (
cb "github.com/hyperledger/fabric-protos-go/common"
"github.com/hyperledger/fabric/bccsp"
"github.com/hyperledger/fabric/common/channelconfig"
"github.com/hyperledger/fabric/common/ledger/blockledger"
"github.com/hyperledger/fabric/common/policies"
"github.com/hyperledger/fabric/internal/pkg/identity"
"github.com/hyperledger/fabric/orderer/common/blockcutter"
"github.com/hyperledger/fabric/orderer/common/msgprocessor"
"github.com/hyperledger/fabric/orderer/consensus"
"github.com/hyperledger/fabric/protoutil"
"github.com/pkg/errors"
)
// ChainSupport holds the resources for a particular channel.
type ChainSupport struct {
*ledgerResources
msgprocessor.Processor
*BlockWriter
consensus.Chain
cutter blockcutter.Receiver
identity.SignerSerializer
BCCSP bccsp.BCCSP
// NOTE: It makes sense to add this to the ChainSupport since the design of Registrar does not assume
// that there is a single consensus type at this orderer node and therefore the resolution of
// the consensus type too happens only at the ChainSupport level.
consensus.MetadataValidator
}
func newChainSupport(
registrar *Registrar,
ledgerResources *ledgerResources,
consenters map[string]consensus.Consenter,
signer identity.SignerSerializer,
blockcutterMetrics *blockcutter.Metrics,
bccsp bccsp.BCCSP,
) *ChainSupport {
// Read in the last block and metadata for the channel
lastBlock := blockledger.GetBlock(ledgerResources, ledgerResources.Height()-1)
metadata, err := protoutil.GetConsenterMetadataFromBlock(lastBlock)
// Assuming a block created with cb.NewBlock(), this should not
// error even if the orderer metadata is an empty byte slice
if err != nil {
logger.Fatalf("[channel: %s] Error extracting orderer metadata: %s", ledgerResources.ConfigtxValidator().ChannelID(), err)
}
// Construct limited support needed as a parameter for additional support
cs := &ChainSupport{
ledgerResources: ledgerResources,
SignerSerializer: signer,
cutter: blockcutter.NewReceiverImpl(
ledgerResources.ConfigtxValidator().ChannelID(),
ledgerResources,
blockcutterMetrics,
),
BCCSP: bccsp,
}
// Set up the msgprocessor
cs.Processor = msgprocessor.NewStandardChannel(cs, msgprocessor.CreateStandardChannelFilters(cs, registrar.config), bccsp)
// Set up the block writer
cs.BlockWriter = newBlockWriter(lastBlock, registrar, cs)
// Set up the consenter
consenterType := ledgerResources.SharedConfig().ConsensusType()
consenter, ok := consenters[consenterType]
if !ok {
logger.Panicf("Error retrieving consenter of type: %s", consenterType)
}
cs.Chain, err = consenter.HandleChain(cs, metadata)
if err != nil {
logger.Panicf("[channel: %s] Error creating consenter: %s", cs.ChannelID(), err)
}
cs.MetadataValidator, ok = cs.Chain.(consensus.MetadataValidator)
if !ok {
cs.MetadataValidator = consensus.NoOpMetadataValidator{}
}
logger.Debugf("[channel: %s] Done creating channel support resources", cs.ChannelID())
return cs
}
// Block returns a block with the following number,
// or nil if such a block doesn't exist.
func (cs *ChainSupport) Block(number uint64) *cb.Block {
if cs.Height() <= number {
return nil
}
return blockledger.GetBlock(cs.Reader(), number)
}
func (cs *ChainSupport) Reader() blockledger.Reader {
return cs
}
// Signer returns the SignerSerializer for this channel.
func (cs *ChainSupport) Signer() identity.SignerSerializer {
return cs
}
func (cs *ChainSupport) start() {
cs.Chain.Start()
}
// BlockCutter returns the blockcutter.Receiver instance for this channel.
func (cs *ChainSupport) BlockCutter() blockcutter.Receiver {
return cs.cutter
}
// Validate passes through to the underlying configtx.Validator
func (cs *ChainSupport) Validate(configEnv *cb.ConfigEnvelope) error {
return cs.ConfigtxValidator().Validate(configEnv)
}
// ProposeConfigUpdate validates a config update using the underlying configtx.Validator
// and the consensus.MetadataValidator.
func (cs *ChainSupport) ProposeConfigUpdate(configtx *cb.Envelope) (*cb.ConfigEnvelope, error) {
env, err := cs.ConfigtxValidator().ProposeConfigUpdate(configtx)
if err != nil {
return nil, err
}
bundle, err := cs.CreateBundle(cs.ChannelID(), env.Config)
if err != nil {
return nil, err
}
if err = checkResources(bundle); err != nil {
return nil, errors.Wrap(err, "config update is not compatible")
}
if err = cs.ValidateNew(bundle); err != nil {
return nil, err
}
oldOrdererConfig, ok := cs.OrdererConfig()
if !ok {
logger.Panic("old config is missing orderer group")
}
oldMetadata := oldOrdererConfig.ConsensusMetadata()
// we can remove this check since this is being validated in checkResources earlier
newOrdererConfig, ok := bundle.OrdererConfig()
if !ok {
return nil, errors.New("new config is missing orderer group")
}
newMetadata := newOrdererConfig.ConsensusMetadata()
if err = cs.ValidateConsensusMetadata(oldMetadata, newMetadata, false); err != nil {
return nil, errors.Wrap(err, "consensus metadata update for channel config update is invalid")
}
return env, nil
}
// ChannelID passes through to the underlying configtx.Validator
func (cs *ChainSupport) ChannelID() string {
return cs.ConfigtxValidator().ChannelID()
}
// ConfigProto passes through to the underlying configtx.Validator
func (cs *ChainSupport) ConfigProto() *cb.Config {
return cs.ConfigtxValidator().ConfigProto()
}
// Sequence passes through to the underlying configtx.Validator
func (cs *ChainSupport) Sequence() uint64 {
return cs.ConfigtxValidator().Sequence()
}
// Append appends a new block to the ledger in its raw form,
// unlike WriteBlock that also mutates its metadata.
func (cs *ChainSupport) Append(block *cb.Block) error {
return cs.ledgerResources.ReadWriter.Append(block)
}
// VerifyBlockSignature verifies a signature of a block.
// It has an optional argument of a configuration envelope
// which would make the block verification to use validation rules
// based on the given configuration in the ConfigEnvelope.
// If the config envelope passed is nil, then the validation rules used
// are the ones that were applied at commit of previous blocks.
func (cs *ChainSupport) VerifyBlockSignature(sd []*protoutil.SignedData, envelope *cb.ConfigEnvelope) error {
policyMgr := cs.PolicyManager()
// If the envelope passed isn't nil, we should use a different policy manager.
if envelope != nil {
bundle, err := channelconfig.NewBundle(cs.ChannelID(), envelope.Config, cs.BCCSP)
if err != nil {
return err
}
policyMgr = bundle.PolicyManager()
}
policy, exists := policyMgr.GetPolicy(policies.BlockValidation)
if !exists {
return errors.Errorf("policy %s wasn't found", policies.BlockValidation)
}
err := policy.EvaluateSignedData(sd)
if err != nil {
return errors.Wrap(err, "block verification failed")
}
return nil
}