# 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
```go
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。
```go
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）]( multichain.md)
## 3、Support接口定义及实现
### 3.1、Support接口定义
```go
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。
```go
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
```go
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。
```go
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
```go
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)
```go
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)
```go
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)
```go
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
```go
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)
```go
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:
```go
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:
```go
### 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:
```go
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)
```go
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：
```go
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)
```go
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
```go
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
```
