forked from hyperledger/fabric
/
chainsupport.go
246 lines (209 loc) · 8.18 KB
/
chainsupport.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package multichannel
import (
"github.com/hyperledger/fabric/common/channelconfig"
"github.com/hyperledger/fabric/common/crypto"
"github.com/hyperledger/fabric/common/ledger/blockledger"
"github.com/hyperledger/fabric/common/policies"
"github.com/hyperledger/fabric/orderer/common/blockcutter"
"github.com/hyperledger/fabric/orderer/common/msgprocessor"
"github.com/hyperledger/fabric/orderer/consensus"
cb "github.com/hyperledger/fabric/protos/common"
"github.com/hyperledger/fabric/protos/orderer"
"github.com/hyperledger/fabric/protos/utils"
"github.com/pkg/errors"
)
// ChainSupport holds the resources for a particular channel.
type ChainSupport struct {
*ledgerResources
msgprocessor.Processor
*BlockWriter
consensus.Chain
cutter blockcutter.Receiver
crypto.LocalSigner
// Needed for consensus-type migration: to execute the migration state machine correctly,
// chains need to know if they are system or standard channel.
systemChannel bool
}
func newChainSupport(
registrar *Registrar,
ledgerResources *ledgerResources,
consenters map[string]consensus.Consenter,
signer crypto.LocalSigner,
blockcutterMetrics *blockcutter.Metrics,
) *ChainSupport {
// Read in the last block and metadata for the channel
lastBlock := blockledger.GetBlock(ledgerResources, ledgerResources.Height()-1)
metadata, err := utils.GetMetadataFromBlock(lastBlock, cb.BlockMetadataIndex_ORDERER)
// 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().ChainID(), err)
}
// Construct limited support needed as a parameter for additional support
cs := &ChainSupport{
ledgerResources: ledgerResources,
LocalSigner: signer,
cutter: blockcutter.NewReceiverImpl(
ledgerResources.ConfigtxValidator().ChainID(),
ledgerResources,
blockcutterMetrics,
),
}
// When ConsortiumsConfig exists, it is the system channel
_, cs.systemChannel = ledgerResources.ConsortiumsConfig()
// Set up the msgprocessor
cs.Processor = msgprocessor.NewStandardChannel(cs, msgprocessor.CreateStandardChannelFilters(cs))
// Set up the block writer
cs.BlockWriter = newBlockWriter(lastBlock, registrar, cs)
// TODO Identify recovery after crash in the middle of consensus-type migration
if cs.detectMigration(lastBlock) {
// We do this because the last block after migration (COMMIT/CONTEXT) carries Kafka metadata.
// This prevents the code down the line from unmarshaling it as Raft, and panicking.
metadata.Value = nil
logger.Debugf("[channel: %s] Consensus-type migration: restart on to Raft, resetting Kafka block metadata", cs.ChainID())
}
// 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.ChainID(), err)
}
logger.Debugf("[channel: %s] Done creating channel support resources", cs.ChainID())
return cs
}
// detectMigration identifies restart after consensus-type migration was committed (green path).
// Restart after migration is detected by:
// 1. The Kafka2RaftMigration capability in on
// 2. The last block carries a config-tx
// 3. In the config-tx, you have:
// - (system-channel && state=COMMIT), OR
// - (standard-channel && state=CONTEXT)
// This assumes that migration was successful (green path). When migration ends successfully,
// every channel will have a config block as the last block. On the system channel, containing state=COMMIT;
// on standard channels, containing state=CONTEXT.
func (cs *ChainSupport) detectMigration(lastBlock *cb.Block) bool {
isMigration := false
if !cs.ledgerResources.SharedConfig().Capabilities().Kafka2RaftMigration() {
return isMigration
}
lastConfigIndex, err := utils.GetLastConfigIndexFromBlock(lastBlock)
if err != nil {
logger.Panicf("Chain did not have appropriately encoded last config in its latest block: %s", err)
}
logger.Debugf("[channel: %s], sysChan=%v, lastConfigIndex=%d, H=%d, mig-state: %s",
cs.ChainID(), cs.systemChannel, lastConfigIndex, cs.ledgerResources.Height(),
cs.ledgerResources.SharedConfig().ConsensusMigrationState())
if lastConfigIndex == lastBlock.Header.Number { //The last block was a config-tx
state := cs.ledgerResources.SharedConfig().ConsensusMigrationState()
if cs.systemChannel {
if state == orderer.ConsensusType_MIG_STATE_COMMIT {
isMigration = true
}
} else {
if state == orderer.ConsensusType_MIG_STATE_CONTEXT {
isMigration = true
}
}
if isMigration {
logger.Infof("[channel: %s], Restarting after consensus-type migration. New consensus-type is: %s",
cs.ChainID(), cs.ledgerResources.SharedConfig().ConsensusType())
}
}
return isMigration
}
// 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 crypto.Localsigner for this channel.
func (cs *ChainSupport) Signer() crypto.LocalSigner {
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 passes through to the underlying configtx.Validator
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.ChainID(), env.Config)
if err != nil {
return nil, err
}
if err = checkResources(bundle); err != nil {
return nil, errors.Wrap(err, "config update is not compatible")
}
return env, cs.ValidateNew(bundle)
}
// ChainID passes through to the underlying configtx.Validator
func (cs *ChainSupport) ChainID() string {
return cs.ConfigtxValidator().ChainID()
}
// 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 []*cb.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.ChainID(), envelope.Config)
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.Evaluate(sd)
if err != nil {
return errors.Wrap(err, "block verification failed")
}
return nil
}
// IsSystemChannel returns true if this is the system channel.
func (cs *ChainSupport) IsSystemChannel() bool {
return cs.systemChannel
}