Fabric 1.0源代码笔记 之 Orderer #configupdate（处理通道配置更新）

1、configupdate概述

configupdate，用于接收配置交易，并处理通道配置更新。
相关代码在orderer/configupdate目录。

2、SupportManager接口定义及实现

2.1、SupportManager接口定义

type SupportManager interface {
????GetChain(chainID string) (Support, bool)
????NewChannelConfig(envConfigUpdate *cb.Envelope) (configtxapi.Manager, error)
}
//代码在orderer/configupdate/configupdate.go

2.2、SupportManager接口实现

SupportManager接口实现，即configUpdateSupport结构体及方法。

type configUpdateSupport struct {
????multichain.Manager //type multiLedger struct
}

func (cus configUpdateSupport) GetChain(chainID string) (configupdate.Support, bool) {
????return cus.Manager.GetChain(chainID)
}
//代码在orderer/server.go

multichain.Manager接口及实现multiLedger，见Fabric 1.0源代码笔记 之 Orderer #multichain（多链支持包）

3、Support接口定义及实现

3.1、Support接口定义

type Support interface {
????ProposeConfigUpdate(env *cb.Envelope) (*cb.ConfigEnvelope, error)
}
//代码在orderer/configupdate/configupdate.go

3.2、Support接口实现

Support接口实现，即configManager结构体及方法。

type configManager struct {
????api.Resources
????callOnUpdate []func(api.Manager)
????initializer  api.Initializer
????current      *configSet
}

func (cm *configManager) processConfig(channelGroup *cb.ConfigGroup) (*configResult, error) //./config.go
func (cm *configManager) commitCallbacks() //./manager.go
func (cm *configManager) ProposeConfigUpdate(configtx *cb.Envelope) (*cb.ConfigEnvelope, error) //./manager.go
func (cm *configManager) proposeConfigUpdate(configtx *cb.Envelope) (*cb.ConfigEnvelope, error) //./manager.go
func (cm *configManager) prepareApply(configEnv *cb.ConfigEnvelope) (*configResult, error) //./manager.go
func (cm *configManager) Validate(configEnv *cb.ConfigEnvelope) error //./manager.go
func (cm *configManager) Apply(configEnv *cb.ConfigEnvelope) error //./manager.go
func (cm *configManager) ChainID() string //./manager.go
func (cm *configManager) Sequence() uint64 //./manager.go
func (cm *configManager) ConfigEnvelope() *cb.ConfigEnvelope //./manager.go
func (cm *configManager) verifyDeltaSet(deltaSet map[string]comparable, signedData []*cb.SignedData) error //./update.go
func (cm *configManager) authorizeUpdate(configUpdateEnv *cb.ConfigUpdateEnvelope) (map[string]comparable, error) //./update.go
func (cm *configManager) policyForItem(item comparable) (policies.Policy, bool) //./update.go
func (cm *configManager) computeUpdateResult(updatedConfig map[string]comparable) map[string]comparable //./update.go
//代码在common/configtx/manager.go

4、ConfigUpdateProcessor接口定义及实现

4.1、ConfigUpdateProcessor接口定义

type ConfigUpdateProcessor interface {
????Process(envConfigUpdate *cb.Envelope) (*cb.Envelope, error)
}
//代码在orderer/common/broadcast/broadcast.go

4.2、ConfigUpdateProcessor接口实现

ConfigUpdateProcessor接口实现，即Processor结构体及方法。

type Processor struct {
????signer               crypto.LocalSigner
????manager              SupportManager //即type configUpdateSupport struct，或者即multichain.multiLedger
????systemChannelID      string
????systemChannelSupport Support
}

//构造Processor
func New(systemChannelID string, supportManager SupportManager, signer crypto.LocalSigner) *Processor
//获取channelID
func channelID(env *cb.Envelope) (string, error) 
//处理通道配置更新
func (p *Processor) Process(envConfigUpdate *cb.Envelope) (*cb.Envelope, error)
func (p *Processor) existingChannelConfig(envConfigUpdate *cb.Envelope, channelID string, support Support) (*cb.Envelope, error)
func (p *Processor) proposeNewChannelToSystemChannel(newChannelEnvConfig *cb.Envelope) (*cb.Envelope, error)
func (p *Processor) newChannelConfig(channelID string, envConfigUpdate *cb.Envelope) (*cb.Envelope, error)
//代码在orderer/configupdate/configupdate.go

4.2.1、func New(systemChannelID string, supportManager SupportManager, signer crypto.LocalSigner) *Processor

func New(systemChannelID string, supportManager SupportManager, signer crypto.LocalSigner) *Processor {
????support, ok := supportManager.GetChain(systemChannelID)
????return &Processor{
????????systemChannelID:      systemChannelID,
????????manager:              supportManager,
????????signer:               signer,
????????systemChannelSupport: support,
????}
}
//代码在orderer/configupdate/configupdate.go

4.2.2、func (p Processor) Process(envConfigUpdate cb.Envelope) (*cb.Envelope, error)

func (p *Processor) Process(envConfigUpdate *cb.Envelope) (*cb.Envelope, error) {
????channelID, err := channelID(envConfigUpdate)
????support, ok := p.manager.GetChain(channelID) //存在
????if ok {
????????return p.existingChannelConfig(envConfigUpdate, channelID, support)
????}
????return p.newChannelConfig(channelID, envConfigUpdate) //不存在
}
//代码在orderer/configupdate/configupdate.go

4.2.3、func (p Processor) existingChannelConfig(envConfigUpdate cb.Envelope, channelID string, support Support) (*cb.Envelope, error)

func (p *Processor) existingChannelConfig(envConfigUpdate *cb.Envelope, channelID string, support Support) (*cb.Envelope, error) {
????configEnvelope, err := support.ProposeConfigUpdate(envConfigUpdate)
????return utils.CreateSignedEnvelope(cb.HeaderType_CONFIG, channelID, p.signer, configEnvelope, msgVersion, epoch)
}
//代码在orderer/configupdate/configupdate.go

4.2.4、func (p Processor) newChannelConfig(channelID string, envConfigUpdate cb.Envelope) (*cb.Envelope, error)

func (p *Processor) newChannelConfig(channelID string, envConfigUpdate *cb.Envelope) (*cb.Envelope, error) {
????ctxm, err := p.manager.NewChannelConfig(envConfigUpdate) //创建新的通道
????newChannelConfigEnv, err := ctxm.ProposeConfigUpdate(envConfigUpdate) //创建新的通道后处理通道配置
????newChannelEnvConfig, err := utils.CreateSignedEnvelope(cb.HeaderType_CONFIG, channelID, p.signer, newChannelConfigEnv, msgVersion, epoch)
????return p.proposeNewChannelToSystemChannel(newChannelEnvConfig)
}
//代码在orderer/configupdate/configupdate.go

5、详解configManager结构体

5.1、configManager结构体定义及方法

type configManager struct {
????api.Resources
????callOnUpdate []func(api.Manager)
????initializer  api.Initializer
????current      *configSet
}

func validateConfigID(configID string) error
func validateChannelID(channelID string) error
func NewManagerImpl(envConfig *cb.Envelope, initializer api.Initializer, callOnUpdate []func(api.Manager)) (api.Manager, error)
func (cm *configManager) commitCallbacks()
func (cm *configManager) ProposeConfigUpdate(configtx *cb.Envelope) (*cb.ConfigEnvelope, error)
func (cm *configManager) proposeConfigUpdate(configtx *cb.Envelope) (*cb.ConfigEnvelope, error)
func (cm *configManager) prepareApply(configEnv *cb.ConfigEnvelope) (*configResult, error)
func (cm *configManager) Validate(configEnv *cb.ConfigEnvelope) error
func (cm *configManager) Apply(configEnv *cb.ConfigEnvelope) error
func (cm *configManager) ChainID() string
func (cm *configManager) Sequence() uint64
func (cm *configManager) ConfigEnvelope() *cb.ConfigEnvelope

func proposeGroup(result *configResult) error
func processConfig(channelGroup *cb.ConfigGroup, proposer api.Proposer) (*configResult, error)
func (cm *configManager) processConfig(channelGroup *cb.ConfigGroup) (*configResult, error)

func (c *configSet) verifyReadSet(readSet map[string]comparable) error
func ComputeDeltaSet(readSet, writeSet map[string]comparable) map[string]comparable
func validateModPolicy(modPolicy string) error
func (cm *configManager) verifyDeltaSet(deltaSet map[string]comparable, signedData []*cb.SignedData) error
func verifyFullProposedConfig(writeSet, fullProposedConfig map[string]comparable) error
//验证所有修改的配置都有相应的修改策略，返回修改过的配置的映射map[string]comparable
func (cm *configManager) authorizeUpdate(configUpdateEnv *cb.ConfigUpdateEnvelope) (map[string]comparable, error)
func (cm *configManager) policyForItem(item comparable) (policies.Policy, bool)
func (cm *configManager) computeUpdateResult(updatedConfig map[string]comparable) map[string]comparable
//Envelope转换为ConfigUpdateEnvelope
func envelopeToConfigUpdate(configtx *cb.Envelope) (*cb.ConfigUpdateEnvelope, error)
//代码在common/configtx/manager.go

5.2、func (cm configManager) ProposeConfigUpdate(configtx cb.Envelope) (*cb.ConfigEnvelope, error)

func (cm *configManager) ProposeConfigUpdate(configtx *cb.Envelope) (*cb.ConfigEnvelope, error) {
????return cm.proposeConfigUpdate(configtx)
}

func (cm *configManager) proposeConfigUpdate(configtx *cb.Envelope) (*cb.ConfigEnvelope, error) {
????//Envelope转换为ConfigUpdateEnvelope
????configUpdateEnv, err := envelopeToConfigUpdate(configtx)
????//验证所有修改的配置都有相应的修改策略，返回修改过的配置的映射map[string]comparable
????configMap, err := cm.authorizeUpdate(configUpdateEnv)
????channelGroup, err := configMapToConfig(configMap) //ConfigGroup
????//实际调用processConfig(channelGroup, cm.initializer)，并最终调用proposeGroup(configResult)
????result, err := cm.processConfig(channelGroup)
????result.rollback()
????return &cb.ConfigEnvelope{
????????Config: &cb.Config{
????????????Sequence:     cm.current.sequence + 1,
????????????ChannelGroup: channelGroup,
????????},
????????LastUpdate: configtx,
????}, nil
}
//代码在common/configtx/manager.go

补充ConfigUpdateEnvelope:

type ConfigUpdateEnvelope struct {
????ConfigUpdate []byte //type ConfigUpdate struct
????Signatures   []*ConfigSignature
}

type ConfigUpdate struct {
????ChannelId string
????ReadSet   *ConfigGroup
????WriteSet  *ConfigGroup
}

type ConfigGroup struct {
????Version   uint64
????Groups    map[string]*ConfigGroup
????Values    map[string]*ConfigValue
????Policies  map[string]*ConfigPolicy
????ModPolicy string
}
//代码在protos/common/configtx.pb.go

补充ConfigGroup:

### 5.3、func (cm *configManager) authorizeUpdate(configUpdateEnv *cb.ConfigUpdateEnvelope) (map[string]comparable, error)

```go
func (cm *configManager) authorizeUpdate(configUpdateEnv *cb.ConfigUpdateEnvelope) (map[string]comparable, error) {
????//反序列化configUpdateEnv.ConfigUpdate
????configUpdate, err := UnmarshalConfigUpdate(configUpdateEnv.ConfigUpdate)

????readSet, err := MapConfig(configUpdate.ReadSet) //map[string]comparable
????err = cm.current.verifyReadSet(readSet)

????writeSet, err := MapConfig(configUpdate.WriteSet) //map[string]comparable

????//从writeSet中逐一对比readSet，去除没有发生变更的
????deltaSet := ComputeDeltaSet(readSet, writeSet) 
????signedData, err := configUpdateEnv.AsSignedData() //转换为SignedData

????err = cm.verifyDeltaSet(deltaSet, signedData) //校验deltaSet

????fullProposedConfig := cm.computeUpdateResult(deltaSet) //合并为fullProposedConfig
????err := verifyFullProposedConfig(writeSet, fullProposedConfig)
????return fullProposedConfig, nil
}
//代码在common/configtx/update.go

补充comparable:

type comparable struct {
????*cb.ConfigGroup
????*cb.ConfigValue
????*cb.ConfigPolicy
????key  string
????path []string
}
//代码在common/configtx/compare.go

5.4、func (cm configManager) processConfig(channelGroup cb.ConfigGroup) (*configResult, error)

func (cm *configManager) processConfig(channelGroup *cb.ConfigGroup) (*configResult, error) {
????configResult, err := processConfig(channelGroup, cm.initializer)
????err = configResult.preCommit()
????return configResult, nil
}
//代码在common/configtx/config.go

补充configResult：

type configResult struct {
????tx                   interface{}
????groupName            string
????groupKey             string
????group                *cb.ConfigGroup
????valueHandler         config.ValueProposer
????policyHandler        policies.Proposer
????subResults           []*configResult
????deserializedValues   map[string]proto.Message
????deserializedPolicies map[string]proto.Message
}

func NewConfigResult(config *cb.ConfigGroup, proposer api.Proposer) (ConfigResult, error)
func (cr *configResult) JSON() string
func (cr *configResult) bufferJSON(buffer *bytes.Buffer)
//cr.valueHandler.PreCommit(cr.tx)
func (cr *configResult) preCommit() error
//cr.valueHandler.CommitProposals(cr.tx)
//cr.policyHandler.CommitProposals(cr.tx)
func (cr *configResult) commit()
//cr.valueHandler.RollbackProposals(cr.tx)
//cr.policyHandler.RollbackProposals(cr.tx)
func (cr *configResult) rollback()
func proposeGroup(result *configResult) error
func processConfig(channelGroup *cb.ConfigGroup, proposer api.Proposer) (*configResult, error)
//代码在common/configtx/config.go

5.4.1、func processConfig(channelGroup cb.ConfigGroup, proposer api.Proposer) (configResult, error)

func processConfig(channelGroup *cb.ConfigGroup, proposer api.Proposer) (*configResult, error) {
????helperGroup := cb.NewConfigGroup()
????helperGroup.Groups[RootGroupKey] = channelGroup

????configResult := &configResult{
????????group:         helperGroup,
????????valueHandler:  proposer.ValueProposer(),
????????policyHandler: proposer.PolicyProposer(),
????}
????err := proposeGroup(configResult)
????return configResult, nil
}
//代码在common/configtx/config.go

5.4.2、func proposeGroup(result *configResult) error

func proposeGroup(result *configResult) error {
????subGroups := make([]string, len(result.group.Groups))
????i := 0
????for subGroup := range result.group.Groups {
????????subGroups[i] = subGroup
????????i++
????}

????valueDeserializer, subValueHandlers, err := result.valueHandler.BeginValueProposals(result.tx, subGroups)
????subPolicyHandlers, err := result.policyHandler.BeginPolicyProposals(result.tx, subGroups)

????for key, value := range result.group.Values {
????????msg, err := valueDeserializer.Deserialize(key, value.Value)
????????result.deserializedValues[key] = msg
????}

????for key, policy := range result.group.Policies {
????????policy, err := result.policyHandler.ProposePolicy(result.tx, key, policy)
????????result.deserializedPolicies[key] = policy
????}

????result.subResults = make([]*configResult, 0, len(subGroups))

????for i, subGroup := range subGroups {
????????result.subResults = append(result.subResults, &configResult{
????????????tx:                   result.tx,
????????????groupKey:             subGroup,
????????????groupName:            result.groupName + "/" + subGroup,
????????????group:                result.group.Groups[subGroup],
????????????valueHandler:         subValueHandlers[i],
????????????policyHandler:        subPolicyHandlers[i],
????????????deserializedValues:   make(map[string]proto.Message),
????????????deserializedPolicies: make(map[string]proto.Message),
????????})
????????err := proposeGroup(result.subResults[i])
????}
????return nil
}
//代码在common/configtx/config.go

区块链教程Fabric1.0源代码分析configupdate处理通道配置更新

原文：http://blog.51cto.com/14041296/2312938