/
chainsupport.go
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/
chainsupport.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 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/utils"
"github.com/pkg/errors"
)
//ChainSupport保存特定通道的资源。
type ChainSupport struct {
*ledgerResources
msgprocessor.Processor
*BlockWriter
consensus.Chain
cutter blockcutter.Receiver
crypto.LocalSigner
}
func newChainSupport(
registrar *Registrar,
ledgerResources *ledgerResources,
consenters map[string]consensus.Consenter,
signer crypto.LocalSigner,
blockcutterMetrics *blockcutter.Metrics,
) *ChainSupport {
//读取通道的最后一个块和元数据
lastBlock := blockledger.GetBlock(ledgerResources, ledgerResources.Height()-1)
metadata, err := utils.GetMetadataFromBlock(lastBlock, cb.BlockMetadataIndex_ORDERER)
//假设使用cb.newblock()创建了一个块,则不应
//即使排序器元数据是空字节片,也会出错
if err != nil {
logger.Fatalf("[channel: %s] Error extracting orderer metadata: %s", ledgerResources.ConfigtxValidator().ChainID(), err)
}
//构造作为附加支持参数所需的有限支持
cs := &ChainSupport{
ledgerResources: ledgerResources,
LocalSigner: signer,
cutter: blockcutter.NewReceiverImpl(
ledgerResources.ConfigtxValidator().ChainID(),
ledgerResources,
blockcutterMetrics,
),
}
//设置msgprocessor
cs.Processor = msgprocessor.NewStandardChannel(cs, msgprocessor.CreateStandardChannelFilters(cs))
//设置块编写器
cs.BlockWriter = newBlockWriter(lastBlock, registrar, cs)
//设置同意人
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
}
//block返回具有以下数字的块,
//如果不存在这样的块,则为零。
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返回此通道的crypto.localsigner。
func (cs *ChainSupport) Signer() crypto.LocalSigner {
return cs
}
func (cs *ChainSupport) start() {
cs.Chain.Start()
}
//BlockCutter返回此通道的BlockCutter.Receiver实例。
func (cs *ChainSupport) BlockCutter() blockcutter.Receiver {
return cs.cutter
}
//验证传递到基础configtx.validator
func (cs *ChainSupport) Validate(configEnv *cb.ConfigEnvelope) error {
return cs.ConfigtxValidator().Validate(configEnv)
}
//ProposeConfigUpdate传递到基础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传递到基础configtx.validator
func (cs *ChainSupport) ChainID() string {
return cs.ConfigtxValidator().ChainID()
}
//configproto传递到基础configtx.validator
func (cs *ChainSupport) ConfigProto() *cb.Config {
return cs.ConfigtxValidator().ConfigProto()
}
//序列传递给基础configtx.validator
func (cs *ChainSupport) Sequence() uint64 {
return cs.ConfigtxValidator().Sequence()
}
//verifyblocksignature验证块的签名。
//它有一个配置信封的可选参数
//这将使块验证使用验证规则
//基于配置开发中的给定配置。
//如果传递的配置信封为零,则使用验证规则
//是在提交前一个块时应用的。
func (cs *ChainSupport) VerifyBlockSignature(sd []*cb.SignedData, envelope *cb.ConfigEnvelope) error {
policyMgr := cs.PolicyManager()
//如果传递的信封不是空的,我们应该使用另一个策略管理器。
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
}