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replication.go
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replication.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package cluster
import (
"bytes"
"encoding/base64"
"encoding/hex"
"encoding/pem"
"time"
"github.com/hyperledger/fabric-protos-go/common"
"github.com/hyperledger/fabric/bccsp"
"github.com/hyperledger/fabric/common/flogging"
"github.com/hyperledger/fabric/internal/pkg/comm"
"github.com/hyperledger/fabric/internal/pkg/identity"
"github.com/hyperledger/fabric/orderer/common/localconfig"
"github.com/hyperledger/fabric/protoutil"
"github.com/pkg/errors"
)
const (
// RetryTimeout is the time the block puller retries.
RetryTimeout = time.Second * 10
)
// ChannelPredicate accepts channels according to their names.
type ChannelPredicate func(channelName string) bool
// AnyChannel accepts all channels.
func AnyChannel(_ string) bool {
return true
}
// PullerConfigFromTopLevelConfig creates a PullerConfig from a TopLevel config,
// and from a signer and TLS key cert pair.
// The PullerConfig's channel is initialized to be the system channel.
func PullerConfigFromTopLevelConfig(
systemChannel string,
conf *localconfig.TopLevel,
tlsKey,
tlsCert []byte,
signer identity.SignerSerializer,
) PullerConfig {
return PullerConfig{
Channel: systemChannel,
MaxTotalBufferBytes: conf.General.Cluster.ReplicationBufferSize,
Timeout: conf.General.Cluster.RPCTimeout,
TLSKey: tlsKey,
TLSCert: tlsCert,
Signer: signer,
}
}
//go:generate mockery -dir . -name LedgerWriter -case underscore -output mocks/
// LedgerWriter allows the caller to write blocks and inspect the height
type LedgerWriter interface {
// Append a new block to the ledger
Append(block *common.Block) error
// Height returns the number of blocks on the ledger
Height() uint64
}
//go:generate mockery -dir . -name LedgerFactory -case underscore -output mocks/
// LedgerFactory retrieves or creates new ledgers by chainID
type LedgerFactory interface {
// GetOrCreate gets an existing ledger (if it exists)
// or creates it if it does not
GetOrCreate(chainID string) (LedgerWriter, error)
}
//go:generate mockery -dir . -name ChannelLister -case underscore -output mocks/
// ChannelLister returns a list of channels
type ChannelLister interface {
// Channels returns a list of channels
Channels() []ChannelGenesisBlock
// Close closes the ChannelLister
Close()
}
// Replicator replicates chains
type Replicator struct {
DoNotPanicIfClusterNotReachable bool
Filter ChannelPredicate
SystemChannel string
ChannelLister ChannelLister
Logger *flogging.FabricLogger
Puller *BlockPuller
BootBlock *common.Block
AmIPartOfChannel SelfMembershipPredicate
LedgerFactory LedgerFactory
}
// IsReplicationNeeded returns whether replication is needed,
// or the cluster node can resume standard boot flow.
func (r *Replicator) IsReplicationNeeded() (bool, error) {
systemChannelLedger, err := r.LedgerFactory.GetOrCreate(r.SystemChannel)
if err != nil {
return false, err
}
height := systemChannelLedger.Height()
var lastBlockSeq uint64
// If Height is 0 then lastBlockSeq would be 2^64 - 1,
// so make it 0 to take care of the overflow.
if height == 0 {
lastBlockSeq = 0
} else {
lastBlockSeq = height - 1
}
if r.BootBlock.Header.Number > lastBlockSeq {
return true, nil
}
return false, nil
}
// ReplicateChains pulls chains and commits them.
// Returns the names of the chains replicated successfully.
func (r *Replicator) ReplicateChains() []string {
var replicatedChains []string
channels := r.discoverChannels()
pullHints := r.channelsToPull(channels)
totalChannelCount := len(pullHints.channelsToPull) + len(pullHints.channelsNotToPull)
r.Logger.Info("Found myself in", len(pullHints.channelsToPull), "channels out of", totalChannelCount, ":", pullHints)
// Append the genesis blocks of the application channels we have into the ledger
for _, channels := range [][]ChannelGenesisBlock{pullHints.channelsToPull, pullHints.channelsNotToPull} {
for _, channel := range channels {
ledger, err := r.LedgerFactory.GetOrCreate(channel.ChannelName)
if err != nil {
r.Logger.Panicf("Failed to create a ledger for channel %s: %v", channel.ChannelName, err)
}
if channel.GenesisBlock == nil {
if ledger.Height() == 0 {
r.Logger.Panicf("Expecting channel %s to at least contain genesis block, but it doesn't", channel.ChannelName)
}
continue
}
r.appendBlock(channel.GenesisBlock, ledger, channel.ChannelName)
}
}
for _, channel := range pullHints.channelsToPull {
err := r.PullChannel(channel.ChannelName)
if err == nil {
replicatedChains = append(replicatedChains, channel.ChannelName)
} else {
r.Logger.Warningf("Failed pulling channel %s: %v", channel.ChannelName, err)
}
}
// Last, pull the system chain.
if err := r.PullChannel(r.SystemChannel); err != nil && err != ErrSkipped {
r.Logger.Panicf("Failed pulling system channel: %v", err)
}
return replicatedChains
}
func (r *Replicator) discoverChannels() []ChannelGenesisBlock {
r.Logger.Debug("Entering")
defer r.Logger.Debug("Exiting")
channels := GenesisBlocks(r.ChannelLister.Channels())
r.Logger.Info("Discovered", len(channels), "channels:", channels.Names())
r.ChannelLister.Close()
return channels
}
// PullChannel pulls the given channel from some orderer,
// and commits it to the ledger.
func (r *Replicator) PullChannel(channel string) error {
if !r.Filter(channel) {
r.Logger.Infof("Channel %s shouldn't be pulled. Skipping it", channel)
return ErrSkipped
}
r.Logger.Info("Pulling channel", channel)
puller := r.Puller.Clone()
defer puller.Close()
puller.Channel = channel
ledger, err := r.LedgerFactory.GetOrCreate(channel)
if err != nil {
r.Logger.Panicf("Failed to create a ledger for channel %s: %v", channel, err)
}
endpoint, latestHeight, _ := latestHeightAndEndpoint(puller)
if endpoint == "" {
return errors.Errorf("failed obtaining the latest block for channel %s", channel)
}
r.Logger.Info("Latest block height for channel", channel, "is", latestHeight)
// Ensure that if we pull the system channel, the latestHeight is bigger or equal to the
// bootstrap block of the system channel.
// Otherwise, we'd be left with a block gap.
if channel == r.SystemChannel && latestHeight-1 < r.BootBlock.Header.Number {
return errors.Errorf("latest height found among system channel(%s) orderers is %d, but the boot block's "+
"sequence is %d", r.SystemChannel, latestHeight, r.BootBlock.Header.Number)
}
return r.pullChannelBlocks(channel, puller, latestHeight, ledger)
}
func (r *Replicator) pullChannelBlocks(channel string, puller *BlockPuller, latestHeight uint64, ledger LedgerWriter) error {
nextBlockToPull := ledger.Height()
if nextBlockToPull == latestHeight {
r.Logger.Infof("Latest height found (%d) is equal to our height, skipping pulling channel %s", latestHeight, channel)
return nil
}
// Pull the next block and remember its hash.
nextBlock := puller.PullBlock(nextBlockToPull)
if nextBlock == nil {
return ErrRetryCountExhausted
}
r.appendBlock(nextBlock, ledger, channel)
actualPrevHash := protoutil.BlockHeaderHash(nextBlock.Header)
for seq := uint64(nextBlockToPull + 1); seq < latestHeight; seq++ {
block := puller.PullBlock(seq)
if block == nil {
return ErrRetryCountExhausted
}
reportedPrevHash := block.Header.PreviousHash
if !bytes.Equal(reportedPrevHash, actualPrevHash) {
return errors.Errorf("block header mismatch on sequence %d, expected %x, got %x",
block.Header.Number, actualPrevHash, reportedPrevHash)
}
actualPrevHash = protoutil.BlockHeaderHash(block.Header)
if channel == r.SystemChannel && block.Header.Number == r.BootBlock.Header.Number {
r.compareBootBlockWithSystemChannelLastConfigBlock(block)
r.appendBlock(block, ledger, channel)
// No need to pull further blocks from the system channel
return nil
}
r.appendBlock(block, ledger, channel)
}
return nil
}
func (r *Replicator) appendBlock(block *common.Block, ledger LedgerWriter, channel string) {
height := ledger.Height()
if height > block.Header.Number {
r.Logger.Infof("Skipping commit of block [%d] for channel %s because height is at %d", block.Header.Number, channel, height)
return
}
if err := ledger.Append(block); err != nil {
r.Logger.Panicf("Failed to write block [%d]: %v", block.Header.Number, err)
}
r.Logger.Infof("Committed block [%d] for channel %s", block.Header.Number, channel)
}
func (r *Replicator) compareBootBlockWithSystemChannelLastConfigBlock(block *common.Block) {
// Overwrite the received block's data hash
block.Header.DataHash = protoutil.BlockDataHash(block.Data)
bootBlockHash := protoutil.BlockHeaderHash(r.BootBlock.Header)
retrievedBlockHash := protoutil.BlockHeaderHash(block.Header)
if bytes.Equal(bootBlockHash, retrievedBlockHash) {
return
}
r.Logger.Panicf("Block header mismatch on last system channel block, expected %s, got %s",
hex.EncodeToString(bootBlockHash), hex.EncodeToString(retrievedBlockHash))
}
type channelPullHints struct {
channelsToPull []ChannelGenesisBlock
channelsNotToPull []ChannelGenesisBlock
}
func (r *Replicator) channelsToPull(channels GenesisBlocks) channelPullHints {
r.Logger.Info("Evaluating channels to pull:", channels.Names())
// Backup the verifier of the puller
verifier := r.Puller.VerifyBlockSequence
// Restore it at the end of the function
defer func() {
r.Puller.VerifyBlockSequence = verifier
}()
// Set it to be a no-op verifier, because we can't verify latest blocks of channels.
r.Puller.VerifyBlockSequence = func(blocks []*common.Block, channel string) error {
return nil
}
var channelsNotToPull []ChannelGenesisBlock
var channelsToPull []ChannelGenesisBlock
for _, channel := range channels {
r.Logger.Info("Probing whether I should pull channel", channel.ChannelName)
puller := r.Puller.Clone()
puller.Channel = channel.ChannelName
// Disable puller buffering when we check whether we are in the channel,
// as we only need to know about a single block.
bufferSize := puller.MaxTotalBufferBytes
puller.MaxTotalBufferBytes = 1
err := Participant(puller, r.AmIPartOfChannel)
puller.Close()
// Restore the previous buffer size
puller.MaxTotalBufferBytes = bufferSize
if err == ErrNotInChannel || err == ErrForbidden {
r.Logger.Infof("I do not belong to channel %s or am forbidden pulling it (%v), skipping chain retrieval", channel.ChannelName, err)
channelsNotToPull = append(channelsNotToPull, channel)
continue
}
if err == ErrServiceUnavailable {
r.Logger.Infof("All orderers in the system channel are either down,"+
"or do not service channel %s (%v), skipping chain retrieval", channel.ChannelName, err)
channelsNotToPull = append(channelsNotToPull, channel)
continue
}
if err == ErrRetryCountExhausted {
r.Logger.Warningf("Could not obtain blocks needed for classifying whether I am in the channel,"+
"skipping the retrieval of the chan %s", channel.ChannelName)
channelsNotToPull = append(channelsNotToPull, channel)
continue
}
if err != nil {
if !r.DoNotPanicIfClusterNotReachable {
r.Logger.Panicf("Failed classifying whether I belong to channel %s: %v, skipping chain retrieval", channel.ChannelName, err)
}
continue
}
r.Logger.Infof("I need to pull channel %s", channel.ChannelName)
channelsToPull = append(channelsToPull, channel)
}
return channelPullHints{
channelsToPull: channelsToPull,
channelsNotToPull: channelsNotToPull,
}
}
// PullerConfig configures a BlockPuller.
type PullerConfig struct {
TLSKey []byte
TLSCert []byte
Timeout time.Duration
Signer identity.SignerSerializer
Channel string
MaxTotalBufferBytes int
}
//go:generate mockery -dir . -name VerifierRetriever -case underscore -output mocks/
// VerifierRetriever retrieves BlockVerifiers for channels.
type VerifierRetriever interface {
// RetrieveVerifier retrieves a BlockVerifier for the given channel.
RetrieveVerifier(channel string) BlockVerifier
}
// BlockPullerFromConfigBlock returns a BlockPuller that doesn't verify signatures on blocks.
func BlockPullerFromConfigBlock(conf PullerConfig, block *common.Block, verifierRetriever VerifierRetriever, bccsp bccsp.BCCSP) (*BlockPuller, error) {
if block == nil {
return nil, errors.New("nil block")
}
endpoints, err := EndpointconfigFromConfigBlock(block, bccsp)
if err != nil {
return nil, err
}
clientConf := comm.ClientConfig{
Timeout: conf.Timeout,
SecOpts: comm.SecureOptions{
Certificate: conf.TLSCert,
Key: conf.TLSKey,
RequireClientCert: true,
UseTLS: true,
},
}
dialer := &StandardDialer{
Config: clientConf.Clone(),
}
tlsCertAsDER, _ := pem.Decode(conf.TLSCert)
if tlsCertAsDER == nil {
return nil, errors.Errorf("unable to decode TLS certificate PEM: %s", base64.StdEncoding.EncodeToString(conf.TLSCert))
}
return &BlockPuller{
Logger: flogging.MustGetLogger("orderer.common.cluster.replication").With("channel", conf.Channel),
Dialer: dialer,
TLSCert: tlsCertAsDER.Bytes,
VerifyBlockSequence: func(blocks []*common.Block, channel string) error {
verifier := verifierRetriever.RetrieveVerifier(channel)
if verifier == nil {
return errors.Errorf("couldn't acquire verifier for channel %s", channel)
}
return VerifyBlocks(blocks, verifier)
},
MaxTotalBufferBytes: conf.MaxTotalBufferBytes,
Endpoints: endpoints,
RetryTimeout: RetryTimeout,
FetchTimeout: conf.Timeout,
Channel: conf.Channel,
Signer: conf.Signer,
}, nil
}
// NoopBlockVerifier doesn't verify block signatures
type NoopBlockVerifier struct{}
// VerifyBlockSignature accepts all signatures over blocks.
func (*NoopBlockVerifier) VerifyBlockSignature(sd []*protoutil.SignedData, config *common.ConfigEnvelope) error {
return nil
}
//go:generate mockery -dir . -name ChainPuller -case underscore -output mocks/
// ChainPuller pulls blocks from a chain
type ChainPuller interface {
// PullBlock pulls the given block from some orderer node
PullBlock(seq uint64) *common.Block
// HeightsByEndpoints returns the block heights by endpoints of orderers
HeightsByEndpoints() (map[string]uint64, error)
// Close closes the ChainPuller
Close()
}
// ChainInspector walks over a chain
type ChainInspector struct {
Logger *flogging.FabricLogger
Puller ChainPuller
LastConfigBlock *common.Block
}
// ErrSkipped denotes that replicating a chain was skipped
var ErrSkipped = errors.New("skipped")
// ErrForbidden denotes that an ordering node refuses sending blocks due to access control.
var ErrForbidden = errors.New("forbidden pulling the channel")
// ErrServiceUnavailable denotes that an ordering node is not servicing at the moment.
var ErrServiceUnavailable = errors.New("service unavailable")
// ErrNotInChannel denotes that an ordering node is not in the channel
var ErrNotInChannel = errors.New("not in the channel")
var ErrRetryCountExhausted = errors.New("retry attempts exhausted")
// SelfMembershipPredicate determines whether the caller is found in the given config block
type SelfMembershipPredicate func(configBlock *common.Block) error
// Participant returns whether the caller participates in the chain.
// It receives a ChainPuller that should already be calibrated for the chain,
// and a SelfMembershipPredicate that is used to detect whether the caller should service the chain.
// It returns nil if the caller participates in the chain.
// It may return:
// ErrNotInChannel in case the caller doesn't participate in the chain.
// ErrForbidden in case the caller is forbidden from pulling the block.
// ErrServiceUnavailable in case all orderers reachable cannot complete the request.
// ErrRetryCountExhausted in case no orderer is reachable.
func Participant(puller ChainPuller, analyzeLastConfBlock SelfMembershipPredicate) error {
lastConfigBlock, err := PullLastConfigBlock(puller)
if err != nil {
return err
}
return analyzeLastConfBlock(lastConfigBlock)
}
// PullLastConfigBlock pulls the last configuration block, or returns an error on failure.
func PullLastConfigBlock(puller ChainPuller) (*common.Block, error) {
endpoint, latestHeight, err := latestHeightAndEndpoint(puller)
if err != nil {
return nil, err
}
if endpoint == "" {
return nil, ErrRetryCountExhausted
}
lastBlock := puller.PullBlock(latestHeight - 1)
if lastBlock == nil {
return nil, ErrRetryCountExhausted
}
lastConfNumber, err := protoutil.GetLastConfigIndexFromBlock(lastBlock)
if err != nil {
return nil, err
}
// The last config block is smaller than the latest height,
// and a block iterator on the server side is a sequenced one.
// So we need to reset the puller if we wish to pull an earlier block.
puller.Close()
lastConfigBlock := puller.PullBlock(lastConfNumber)
if lastConfigBlock == nil {
return nil, ErrRetryCountExhausted
}
return lastConfigBlock, nil
}
func latestHeightAndEndpoint(puller ChainPuller) (string, uint64, error) {
var maxHeight uint64
var mostUpToDateEndpoint string
heightsByEndpoints, err := puller.HeightsByEndpoints()
if err != nil {
return "", 0, err
}
for endpoint, height := range heightsByEndpoints {
if height >= maxHeight {
maxHeight = height
mostUpToDateEndpoint = endpoint
}
}
return mostUpToDateEndpoint, maxHeight, nil
}
// Close closes the ChainInspector
func (ci *ChainInspector) Close() {
ci.Puller.Close()
}
// ChannelGenesisBlock wraps a Block and its channel name
type ChannelGenesisBlock struct {
ChannelName string
GenesisBlock *common.Block
}
// GenesisBlocks aggregates several ChannelGenesisBlocks
type GenesisBlocks []ChannelGenesisBlock
// Names returns the channel names all ChannelGenesisBlocks
func (gbs GenesisBlocks) Names() []string {
var res []string
for _, gb := range gbs {
res = append(res, gb.ChannelName)
}
return res
}
// Channels returns the list of ChannelGenesisBlocks
// for all channels. Each such ChannelGenesisBlock contains
// the genesis block of the channel.
func (ci *ChainInspector) Channels() []ChannelGenesisBlock {
channels := make(map[string]ChannelGenesisBlock)
lastConfigBlockNum := ci.LastConfigBlock.Header.Number
var block *common.Block
var prevHash []byte
for seq := uint64(0); seq < lastConfigBlockNum; seq++ {
block = ci.Puller.PullBlock(seq)
if block == nil {
ci.Logger.Panicf("Failed pulling block [%d] from the system channel", seq)
}
ci.validateHashPointer(block, prevHash)
// Set the previous hash for the next iteration
prevHash = protoutil.BlockHeaderHash(block.Header)
channel, gb, err := ExtractGenesisBlock(ci.Logger, block)
if err != nil {
// If we failed to inspect a block, something is wrong in the system chain
// we're trying to pull, so abort.
ci.Logger.Panicf("Failed extracting channel genesis block from config block: %v", err)
}
if channel == "" {
ci.Logger.Info("Block", seq, "doesn't contain a new channel")
continue
}
ci.Logger.Info("Block", seq, "contains channel", channel)
channels[channel] = ChannelGenesisBlock{
ChannelName: channel,
GenesisBlock: gb,
}
}
// At this point, block holds reference to the last block pulled.
// We ensure that the hash of the last block pulled, is the previous hash
// of the LastConfigBlock we were initialized with.
// We don't need to verify the entire chain of all blocks we pulled,
// because the block puller calls VerifyBlockHash on all blocks it pulls.
last2Blocks := []*common.Block{block, ci.LastConfigBlock}
if err := VerifyBlockHash(1, last2Blocks); err != nil {
ci.Logger.Panic("System channel pulled doesn't match the boot last config block:", err)
}
return flattenChannelMap(channels)
}
func (ci *ChainInspector) validateHashPointer(block *common.Block, prevHash []byte) {
if prevHash == nil {
return
}
if bytes.Equal(block.Header.PreviousHash, prevHash) {
return
}
ci.Logger.Panicf("Claimed previous hash of block [%d] is %x but actual previous hash is %x",
block.Header.Number, block.Header.PreviousHash, prevHash)
}
func flattenChannelMap(m map[string]ChannelGenesisBlock) []ChannelGenesisBlock {
var res []ChannelGenesisBlock
for _, csb := range m {
res = append(res, csb)
}
return res
}
// ExtractGenesisBlock determines if a config block creates new channel, in which
// case it returns channel name, genesis block and nil error.
func ExtractGenesisBlock(logger *flogging.FabricLogger, block *common.Block) (string, *common.Block, error) {
if block == nil {
return "", nil, errors.New("nil block")
}
env, err := protoutil.ExtractEnvelope(block, 0)
if err != nil {
return "", nil, err
}
payload, err := protoutil.UnmarshalPayload(env.Payload)
if err != nil {
return "", nil, err
}
if payload.Header == nil {
return "", nil, errors.New("nil header in payload")
}
chdr, err := protoutil.UnmarshalChannelHeader(payload.Header.ChannelHeader)
if err != nil {
return "", nil, err
}
// The transaction is not orderer transaction
if common.HeaderType(chdr.Type) != common.HeaderType_ORDERER_TRANSACTION {
return "", nil, nil
}
systemChannelName := chdr.ChannelId
innerEnvelope, err := protoutil.UnmarshalEnvelope(payload.Data)
if err != nil {
return "", nil, err
}
innerPayload, err := protoutil.UnmarshalPayload(innerEnvelope.Payload)
if err != nil {
return "", nil, err
}
if innerPayload.Header == nil {
return "", nil, errors.New("inner payload's header is nil")
}
chdr, err = protoutil.UnmarshalChannelHeader(innerPayload.Header.ChannelHeader)
if err != nil {
return "", nil, err
}
// The inner payload's header should be a config transaction
if common.HeaderType(chdr.Type) != common.HeaderType_CONFIG {
logger.Warnf("Expecting %s envelope in block, got %s", common.HeaderType_CONFIG, common.HeaderType(chdr.Type))
return "", nil, nil
}
// In any case, exclude all system channel transactions
if chdr.ChannelId == systemChannelName {
logger.Warnf("Expecting config envelope in %s block to target a different "+
"channel other than system channel '%s'", common.HeaderType_ORDERER_TRANSACTION, systemChannelName)
return "", nil, nil
}
metadata := &common.BlockMetadata{
Metadata: make([][]byte, 4),
}
metadata.Metadata[common.BlockMetadataIndex_SIGNATURES] = protoutil.MarshalOrPanic(&common.OrdererBlockMetadata{
LastConfig: &common.LastConfig{Index: 0},
// This is a genesis block, peer never verify this signature because we can't bootstrap
// trust from an earlier block, hence there are no signatures here.
})
metadata.Metadata[common.BlockMetadataIndex_LAST_CONFIG] = protoutil.MarshalOrPanic(&common.Metadata{
Value: protoutil.MarshalOrPanic(&common.LastConfig{Index: 0}),
// This is a genesis block, peer never verify this signature because we can't bootstrap
// trust from an earlier block, hence there are no signatures here.
})
blockdata := &common.BlockData{Data: [][]byte{payload.Data}}
b := &common.Block{
Header: &common.BlockHeader{DataHash: protoutil.BlockDataHash(blockdata)},
Data: blockdata,
Metadata: metadata,
}
return chdr.ChannelId, b, nil
}