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util.go
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util.go
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//此源码被清华学神尹成大魔王专业翻译分析并修改
//尹成QQ77025077
//尹成微信18510341407
//尹成所在QQ群721929980
//尹成邮箱 yinc13@mails.tsinghua.edu.cn
//尹成毕业于清华大学,微软区块链领域全球最有价值专家
//https://mvp.microsoft.com/zh-cn/PublicProfile/4033620
/*
版权所有IBM公司。保留所有权利。
SPDX许可证标识符:Apache-2.0
**/
package etcdraft
import (
"bytes"
"encoding/pem"
"github.com/coreos/etcd/raft"
"github.com/coreos/etcd/raft/raftpb"
"github.com/golang/protobuf/proto"
"github.com/hyperledger/fabric/common/channelconfig"
"github.com/hyperledger/fabric/common/configtx"
"github.com/hyperledger/fabric/common/flogging"
"github.com/hyperledger/fabric/orderer/common/cluster"
"github.com/hyperledger/fabric/orderer/common/localconfig"
"github.com/hyperledger/fabric/orderer/consensus"
"github.com/hyperledger/fabric/protos/common"
"github.com/hyperledger/fabric/protos/orderer"
"github.com/hyperledger/fabric/protos/orderer/etcdraft"
"github.com/hyperledger/fabric/protos/utils"
"github.com/pkg/errors"
)
//成员身份更改保留有关成员身份的信息
//配置更新期间引入的更改
type MembershipChanges struct {
AddedNodes []*etcdraft.Consenter
RemovedNodes []*etcdraft.Consenter
TotalChanges uint32
}
//根据成员资格更改和raftmetadata方法计算更新raftmetadata和confchange
//将应用于raft集群配置的更新,以及更新之间的映射
//元数据中的同意者及其ID
func (mc *MembershipChanges) UpdateRaftMetadataAndConfChange(raftMetadata *etcdraft.RaftMetadata) *raftpb.ConfChange {
if mc == nil || mc.TotalChanges == 0 {
return nil
}
var confChange *raftpb.ConfChange
//产生相应的筏形结构变化
if len(mc.AddedNodes) > 0 {
nodeID := raftMetadata.NextConsenterId
raftMetadata.Consenters[nodeID] = mc.AddedNodes[0]
raftMetadata.NextConsenterId++
confChange = &raftpb.ConfChange{
ID: raftMetadata.ConfChangeCounts,
NodeID: nodeID,
Type: raftpb.ConfChangeAddNode,
}
raftMetadata.ConfChangeCounts++
return confChange
}
if len(mc.RemovedNodes) > 0 {
for _, c := range mc.RemovedNodes {
for nodeID, node := range raftMetadata.Consenters {
if bytes.Equal(c.ClientTlsCert, node.ClientTlsCert) {
delete(raftMetadata.Consenters, nodeID)
confChange = &raftpb.ConfChange{
ID: raftMetadata.ConfChangeCounts,
NodeID: nodeID,
Type: raftpb.ConfChangeRemoveNode,
}
raftMetadata.ConfChangeCounts++
break
}
}
}
}
return confChange
}
//EndpointConfigFromSupport从同意者支持提取TLS CA证书和终结点
func EndpointconfigFromFromSupport(support consensus.ConsenterSupport) (*cluster.EndpointConfig, error) {
lastConfigBlock, err := lastConfigBlockFromSupport(support)
if err != nil {
return nil, err
}
endpointconf, err := cluster.EndpointconfigFromConfigBlock(lastConfigBlock)
if err != nil {
return nil, err
}
return endpointconf, nil
}
func lastConfigBlockFromSupport(support consensus.ConsenterSupport) (*common.Block, error) {
lastBlockSeq := support.Height() - 1
lastBlock := support.Block(lastBlockSeq)
if lastBlock == nil {
return nil, errors.Errorf("unable to retrieve block %d", lastBlockSeq)
}
lastConfigBlock, err := LastConfigBlock(lastBlock, support)
if err != nil {
return nil, err
}
return lastConfigBlock, nil
}
//last config block返回相对于给定块的最后一个配置块。
func LastConfigBlock(block *common.Block, support consensus.ConsenterSupport) (*common.Block, error) {
if block == nil {
return nil, errors.New("nil block")
}
if support == nil {
return nil, errors.New("nil support")
}
if block.Metadata == nil || len(block.Metadata.Metadata) <= int(common.BlockMetadataIndex_LAST_CONFIG) {
return nil, errors.New("no metadata in block")
}
lastConfigBlockNum, err := utils.GetLastConfigIndexFromBlock(block)
if err != nil {
return nil, err
}
lastConfigBlock := support.Block(lastConfigBlockNum)
if lastConfigBlock == nil {
return nil, errors.Errorf("unable to retrieve last config block %d", lastConfigBlockNum)
}
return lastConfigBlock, nil
}
//new block puller创建新的块puller
func newBlockPuller(support consensus.ConsenterSupport,
baseDialer *cluster.PredicateDialer,
clusterConfig localconfig.Cluster) (*cluster.BlockPuller, error) {
verifyBlockSequence := func(blocks []*common.Block) error {
return cluster.VerifyBlocks(blocks, support)
}
secureConfig, err := baseDialer.ClientConfig()
if err != nil {
return nil, err
}
secureConfig.AsyncConnect = false
stdDialer := &cluster.StandardDialer{
Dialer: cluster.NewTLSPinningDialer(secureConfig),
}
//从配置中提取TLS CA证书和终结点,
endpointConfig, err := EndpointconfigFromFromSupport(support)
if err != nil {
return nil, err
}
//并覆盖它们。
secureConfig.SecOpts.ServerRootCAs = endpointConfig.TLSRootCAs
stdDialer.Dialer.SetConfig(secureConfig)
der, _ := pem.Decode(secureConfig.SecOpts.Certificate)
if der == nil {
return nil, errors.Errorf("client certificate isn't in PEM format: %v",
string(secureConfig.SecOpts.Certificate))
}
return &cluster.BlockPuller{
VerifyBlockSequence: verifyBlockSequence,
Logger: flogging.MustGetLogger("orderer.common.cluster.puller"),
RetryTimeout: clusterConfig.ReplicationRetryTimeout,
MaxTotalBufferBytes: clusterConfig.ReplicationBufferSize,
FetchTimeout: clusterConfig.ReplicationPullTimeout,
Endpoints: endpointConfig.Endpoints,
Signer: support,
TLSCert: der.Bytes,
Channel: support.ChainID(),
Dialer: stdDialer,
}, nil
}
//raftpeers将同意者映射到raft.peer的切片。
func RaftPeers(consenters map[uint64]*etcdraft.Consenter) []raft.Peer {
var peers []raft.Peer
for raftID := range consenters {
peers = append(peers, raft.Peer{ID: raftID})
}
return peers
}
//同意者映射同意者到密钥为客户端TLS证书的集合中
func ConsentersToMap(consenters []*etcdraft.Consenter) map[string]struct{} {
set := map[string]struct{}{}
for _, c := range consenters {
set[string(c.ClientTlsCert)] = struct{}{}
}
return set
}
//membershipbycert将同意者映射转换为由映射封装的集
//其中密钥是客户端TLS证书
func MembershipByCert(consenters map[uint64]*etcdraft.Consenter) map[string]struct{} {
set := map[string]struct{}{}
for _, c := range consenters {
set[string(c.ClientTlsCert)] = struct{}{}
}
return set
}
//ComputemMembershipChanges根据有关新使用者和返回的信息计算成员身份更新
//两片:一片添加的同意者和一片要移除的同意者
func ComputeMembershipChanges(oldConsenters map[uint64]*etcdraft.Consenter, newConsenters []*etcdraft.Consenter) *MembershipChanges {
result := &MembershipChanges{
AddedNodes: []*etcdraft.Consenter{},
RemovedNodes: []*etcdraft.Consenter{},
}
currentConsentersSet := MembershipByCert(oldConsenters)
for _, c := range newConsenters {
if _, exists := currentConsentersSet[string(c.ClientTlsCert)]; !exists {
result.AddedNodes = append(result.AddedNodes, c)
result.TotalChanges++
}
}
newConsentersSet := ConsentersToMap(newConsenters)
for _, c := range oldConsenters {
if _, exists := newConsentersSet[string(c.ClientTlsCert)]; !exists {
result.RemovedNodes = append(result.RemovedNodes, c)
result.TotalChanges++
}
}
return result
}
//MetadataFromConfigValue从配置值读取配置更新并将其转换为raft元数据
func MetadataFromConfigValue(configValue *common.ConfigValue) (*etcdraft.Metadata, error) {
consensusTypeValue := &orderer.ConsensusType{}
if err := proto.Unmarshal(configValue.Value, consensusTypeValue); err != nil {
return nil, errors.Wrap(err, "failed to unmarshal consensusType config update")
}
updatedMetadata := &etcdraft.Metadata{}
if err := proto.Unmarshal(consensusTypeValue.Metadata, updatedMetadata); err != nil {
return nil, errors.Wrap(err, "failed to unmarshal updated (new) etcdraft metadata configuration")
}
return updatedMetadata, nil
}
//MetadataFromConfigUpdate从配置更新中提取共识元数据
func MetadataFromConfigUpdate(update *common.ConfigUpdate) (*etcdraft.Metadata, error) {
if ordererConfigGroup, ok := update.WriteSet.Groups["Orderer"]; ok {
if val, ok := ordererConfigGroup.Values["ConsensusType"]; ok {
return MetadataFromConfigValue(val)
}
}
return nil, nil
}
//configDevelopeFromBlock基于
//配置类型,即headertype_order_transaction或headertype_config
func ConfigEnvelopeFromBlock(block *common.Block) (*common.Envelope, error) {
if block == nil {
return nil, errors.New("nil block")
}
envelope, err := utils.ExtractEnvelope(block, 0)
if err != nil {
return nil, errors.Wrapf(err, "failed to extract envelop from the block")
}
channelHeader, err := utils.ChannelHeader(envelope)
if err != nil {
return nil, errors.Wrap(err, "cannot extract channel header")
}
switch channelHeader.Type {
case int32(common.HeaderType_ORDERER_TRANSACTION):
payload, err := utils.UnmarshalPayload(envelope.Payload)
if err != nil {
return nil, errors.Wrap(err, "failed to unmarshal envelope to extract config payload for orderer transaction")
}
configEnvelop, err := utils.UnmarshalEnvelope(payload.Data)
if err != nil {
return nil, errors.Wrap(err, "failed to unmarshal config envelope for orderer type transaction")
}
return configEnvelop, nil
case int32(common.HeaderType_CONFIG):
return envelope, nil
default:
return nil, errors.Errorf("unexpected header type: %v", channelHeader.Type)
}
}
//conensusMetadataFromConfigBlock从配置块读取共识元数据更新
func ConsensusMetadataFromConfigBlock(block *common.Block) (*etcdraft.Metadata, error) {
if block == nil {
return nil, errors.New("nil block")
}
if !utils.IsConfigBlock(block) {
return nil, errors.New("not a config block")
}
configEnvelope, err := ConfigEnvelopeFromBlock(block)
if err != nil {
return nil, errors.Wrap(err, "cannot read config update")
}
payload, err := utils.ExtractPayload(configEnvelope)
if err != nil {
return nil, errors.Wrap(err, "failed extract payload from config envelope")
}
//获取配置更新
configUpdate, err := configtx.UnmarshalConfigUpdateFromPayload(payload)
if err != nil {
return nil, errors.Wrap(err, "could not read config update")
}
return MetadataFromConfigUpdate(configUpdate)
}
//每当block为config block并携带时,ismembershipupdate检查
//RAFT集群成员更新
func IsMembershipUpdate(block *common.Block, currentMetadata *etcdraft.RaftMetadata) (bool, error) {
if !utils.IsConfigBlock(block) {
return false, nil
}
metadata, err := ConsensusMetadataFromConfigBlock(block)
if err != nil {
return false, errors.Wrap(err, "error reading consensus metadata")
}
if metadata != nil {
changes := ComputeMembershipChanges(currentMetadata.Consenters, metadata.Consenters)
return changes.TotalChanges > 0, nil
}
return false, nil
}
//同意证书表示同意人的TLS证书
type ConsenterCertificate []byte
//isconsenterfchannel返回调用方是否同意某个通道
//通过检查给定的配置块。
//如果为真,则返回零,否则返回错误。
func (conCert ConsenterCertificate) IsConsenterOfChannel(configBlock *common.Block) error {
if configBlock == nil {
return errors.New("nil block")
}
envelopeConfig, err := utils.ExtractEnvelope(configBlock, 0)
if err != nil {
return err
}
bundle, err := channelconfig.NewBundleFromEnvelope(envelopeConfig)
if err != nil {
return err
}
oc, exists := bundle.OrdererConfig()
if !exists {
return errors.New("no orderer config in bundle")
}
m := &etcdraft.Metadata{}
if err := proto.Unmarshal(oc.ConsensusMetadata(), m); err != nil {
return err
}
for _, consenter := range m.Consenters {
if bytes.Equal(conCert, consenter.ServerTlsCert) || bytes.Equal(conCert, consenter.ClientTlsCert) {
return nil
}
}
return cluster.ErrNotInChannel
}