hperledger fabric 1.0 源码分析之peer chaincode instantiate

概述

peer chaincode instantiate命令用于对已安装(install)的链码实例化

介绍

instantiate命令定义

向命令instantiate添加flagList中的标记，分别代表，

Lang：链码语言（go,nodejs等）

ctor : json字符串参数(如：‘{args:[''init","a","100","b","200"]}’)

name:链码名称

channelID:通道

version:链码版本

policy:背书策略

escc:对交易结果的结构转换和签名背书

vscc:记账前对区块和交易进行验证

func instantiateCmd(cf *ChaincodeCmdFactory) *cobra.Command {
	chaincodeInstantiateCmd = &cobra.Command{
		Use:       instantiateCmdName,
		Short:     fmt.Sprint(instantiateDesc),
		Long:      fmt.Sprint(instantiateDesc),
		ValidArgs: []string{"1"},
		RunE: func(cmd *cobra.Command, args []string) error {
			return chaincodeDeploy(cmd, args, cf)
		},
	}
	flagList := []string{
		"lang",
		"ctor",
		"name",
		"channelID",
		"version",
		"policy",
		"escc",
		"vscc",
	}
	attachFlags(chaincodeInstantiateCmd, flagList)

	return chaincodeInstantiateCmd
}

命令执行过程

命令从chaincodeDeploy方法开始

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func chaincodeDeploy(cmd *cobra.Command, args []string, cf *ChaincodeCmdFactory) error {
	var err error
	if cf == nil {
        //获取ChaincodeCmdFactory
		cf, err = InitCmdFactory(true, true)
		if err != nil {
			return err
		}
	}
    //将所有信息发送完毕后关闭grpc连接
	defer cf.BroadcastClient.Close()
    //链码实例化流程
	env, err := instantiate(cmd, cf)
	if err != nil {
		return err
	}
    //成功实例化后返回组合消息并签名的交易信封
	if env != nil {
        //发送交易信封内容到orderer排序
		err = cf.BroadcastClient.Send(env)
	}

	return err
}

 InitCmdFactory方法已经在peer chaincode install详细介绍。

instantiate过程

func instantiate(cmd *cobra.Command, cf *ChaincodeCmdFactory) (*protcommon.Envelope, error) {
    //获取ChaincodeSpec
	spec, err := getChaincodeSpec(cmd)
	if err != nil {
		return nil, err
	}
    //获取ChaincodeDeploymentSpec
	cds, err := getChaincodeDeploymentSpec(spec, false)
	if err != nil {
		return nil, fmt.Errorf("Error getting chaincode code %s: %s", chainFuncName, err)
	}
    //从msp获取签名身份
	creator, err := cf.Signer.Serialize()
	if err != nil {
		return nil, fmt.Errorf("Error serializing identity for %s: %s", cf.Signer.GetIdentifier(), err)
	}
    //根据ChaincodeDeploymentSpec创建部署的提案
	prop, _, err := utils.CreateDeployProposalFromCDS(chainID, cds, creator, policyMarhsalled, []byte(escc), []byte(vscc))
	if err != nil {
		return nil, fmt.Errorf("Error creating proposal  %s: %s", chainFuncName, err)
	}
    //对提案签名
	var signedProp *pb.SignedProposal
	signedProp, err = utils.GetSignedProposal(prop, cf.Signer)
	if err != nil {
		return nil, fmt.Errorf("Error creating signed proposal  %s: %s", chainFuncName, err)
	}
    //背书节点对提案处理并返回提案响应
	proposalResponse, err := cf.EndorserClient.ProcessProposal(context.Background(), signedProp)
	if err != nil {
		return nil, fmt.Errorf("Error endorsing %s: %s", chainFuncName, err)
	}

	if proposalResponse != nil {
		// assemble a signed transaction (it's an Envelope message)
        //组合消息并签名返回至客户端交易的信封
		env, err := utils.CreateSignedTx(prop, cf.Signer, proposalResponse)
		if err != nil {
			return nil, fmt.Errorf("Could not assemble transaction, err %s", err)
		}

		return env, nil
	}

	return nil, nil
}

getChaincodeSpec()，getChaincodeDeploymentSpec()方法详情已经在hperledger fabric 1.0 源码分析之peer chaincode install介绍。看下签名身份的获取

//cf *ChaincodeCmdFactory结构的定义
type ChaincodeCmdFactory struct {
	EndorserClient  pb.EndorserClient
	Signer          msp.SigningIdentity
	BroadcastClient common.BroadcastClient
}
//由上可知cf.Signer来源于msp.SigningIdentity
//msp.SigningIdentity的定义
type SigningIdentity interface {

	// Extends Identity
	Identity

	// Sign the message
	Sign(msg []byte) ([]byte, error)

	// GetPublicVersion returns the public parts of this identity
	GetPublicVersion() Identity
}
//SigningIdentity.Sign具体实现
func (id *signingidentity) Sign(msg []byte) ([]byte, error) {
	//mspIdentityLogger.Infof("Signing message")

	// Compute Hash
	hashOpt, err := id.getHashOpt(id.msp.cryptoConfig.SignatureHashFamily)
	if err != nil {
		return nil, fmt.Errorf("Failed getting hash function options [%s]", err)
	}

	digest, err := id.msp.bccsp.Hash(msg, hashOpt)
	if err != nil {
		return nil, fmt.Errorf("Failed computing digest [%s]", err)
	}

	if len(msg) < 32 {
		mspIdentityLogger.Debugf("Sign: plaintext: %X \n", msg)
	} else {
		mspIdentityLogger.Debugf("Sign: plaintext: %X...%X \n", msg[0:16], msg[len(msg)-16:])
	}
	mspIdentityLogger.Debugf("Sign: digest: %X \n", digest)

	// Sign
	return id.signer.Sign(rand.Reader, digest, nil)
}

返回来，看提案的创建（根据ChaincodeDeploymentSpec创建部署的提案）

func CreateDeployProposalFromCDS(chainID string, cds *peer.ChaincodeDeploymentSpec, creator []byte, policy []byte, escc []byte, vscc []byte) (*peer.Proposal, string, error) {
	return createProposalFromCDS(chainID, cds, creator, policy, escc, vscc, "deploy")
}
func createProposalFromCDS(chainID string, msg proto.Message, creator []byte, policy []byte, escc []byte, vscc []byte, propType string) (*peer.Proposal, string, error) {
	//in the new mode, cds will be nil, "deploy" and "upgrade" are instantiates.
	var ccinp *peer.ChaincodeInput
	var b []byte
	var err error
	if msg != nil {
		b, err = proto.Marshal(msg)
		if err != nil {
			return nil, "", err
		}
	}
	switch propType {
	case "deploy":
		fallthrough
	case "upgrade":
		cds, ok := msg.(*peer.ChaincodeDeploymentSpec)
		if !ok || cds == nil {
			return nil, "", fmt.Errorf("invalid message for creating lifecycle chaincode proposal from")
		}
		ccinp = &peer.ChaincodeInput{Args: [][]byte{[]byte(propType), []byte(chainID), b, policy, escc, vscc}}
	case "install":
		ccinp = &peer.ChaincodeInput{Args: [][]byte{[]byte(propType), b}}
	}

	//wrap the deployment in an invocation spec to lscc...
	lsccSpec := &peer.ChaincodeInvocationSpec{
		ChaincodeSpec: &peer.ChaincodeSpec{
			Type:        peer.ChaincodeSpec_GOLANG,
			ChaincodeId: &peer.ChaincodeID{Name: "lscc"},
			Input:       ccinp}}

	//...and get the proposal for it
	return CreateProposalFromCIS(common.HeaderType_ENDORSER_TRANSACTION, chainID, lsccSpec, creator)
}
func CreateProposalFromCIS(typ common.HeaderType, chainID string, cis *peer.ChaincodeInvocationSpec, creator []byte) (*peer.Proposal, string, error) {
	return CreateChaincodeProposal(typ, chainID, cis, creator)
}
func CreateChaincodeProposal(typ common.HeaderType, chainID string, cis *peer.ChaincodeInvocationSpec, creator []byte) (*peer.Proposal, string, error) {
	return CreateChaincodeProposalWithTransient(typ, chainID, cis, creator, nil)
}
func CreateChaincodeProposalWithTransient(typ common.HeaderType, chainID string, cis *peer.ChaincodeInvocationSpec, creator []byte, transientMap map[string][]byte) (*peer.Proposal, string, error) {
	// generate a random nonce
	nonce, err := crypto.GetRandomNonce()
	if err != nil {
		return nil, "", err
	}

	// compute txid
	txid, err := ComputeProposalTxID(nonce, creator)
	if err != nil {
		return nil, "", err
	}

	return CreateChaincodeProposalWithTxIDNonceAndTransient(txid, typ, chainID, cis, nonce, creator, transientMap)
}
func CreateChaincodeProposalWithTxIDNonceAndTransient(txid string, typ common.HeaderType, chainID string, cis *peer.ChaincodeInvocationSpec, nonce, creator []byte, transientMap map[string][]byte) (*peer.Proposal, string, error) {
	ccHdrExt := &peer.ChaincodeHeaderExtension{ChaincodeId: cis.ChaincodeSpec.ChaincodeId}
	ccHdrExtBytes, err := proto.Marshal(ccHdrExt)
	if err != nil {
		return nil, "", err
	}

	cisBytes, err := proto.Marshal(cis)
	if err != nil {
		return nil, "", err
	}

	ccPropPayload := &peer.ChaincodeProposalPayload{Input: cisBytes, TransientMap: transientMap}
	ccPropPayloadBytes, err := proto.Marshal(ccPropPayload)
	if err != nil {
		return nil, "", err
	}

	// TODO: epoch is now set to zero. This must be changed once we
	// get a more appropriate mechanism to handle it in.
	var epoch uint64 = 0

	timestamp := util.CreateUtcTimestamp()

	hdr := &common.Header{ChannelHeader: MarshalOrPanic(&common.ChannelHeader{
		Type:      int32(typ),
		TxId:      txid,
		Timestamp: timestamp,
		ChannelId: chainID,
		Extension: ccHdrExtBytes,
		Epoch:     epoch}),
		SignatureHeader: MarshalOrPanic(&common.SignatureHeader{Nonce: nonce, Creator: creator})}

	hdrBytes, err := proto.Marshal(hdr)
	if err != nil {
		return nil, "", err
	}

	return &peer.Proposal{Header: hdrBytes, Payload: ccPropPayloadBytes}, txid, nil
}

整个一系列的提案生成过程与peer chaincode install命令中生成安装提案的过程十分类似。通过源码比较可以发现，在创建提案时传入的参数不同，后续调用的方法相同

//源码位于github.com/hyperledger/fabric/protos/utils/proputils.go

//创建安装提案
func CreateInstallProposalFromCDS(ccpack proto.Message, creator []byte) (*peer.Proposal, string, error) {
	return createProposalFromCDS("", ccpack, creator, nil, nil, nil, "install")
}
//创建部署提案
func CreateDeployProposalFromCDS(chainID string, cds *peer.ChaincodeDeploymentSpec, creator []byte, policy []byte, escc []byte, vscc []byte) (*peer.Proposal, string, error) {
	return createProposalFromCDS(chainID, cds, creator, policy, escc, vscc, "deploy")
}

//创建更新提案
func CreateUpgradeProposalFromCDS(chainID string, cds *peer.ChaincodeDeploymentSpec, creator []byte, policy []byte, escc []byte, vscc []byte) (*peer.Proposal, string, error) {
	return createProposalFromCDS(chainID, cds, creator, policy, escc, vscc, "upgrade")
}

成功创建提案，根据签名所有人cf.Signer和提案prop进行签名。返回签名后的对象peer.SignedProposal

func GetSignedProposal(prop *peer.Proposal, signer msp.SigningIdentity) (*peer.SignedProposal, error) {
	// check for nil argument
	if prop == nil || signer == nil {
		return nil, fmt.Errorf("Nil arguments")
	}

	propBytes, err := GetBytesProposal(prop)
	if err != nil {
		return nil, err
	}

	signature, err := signer.Sign(propBytes)
	if err != nil {
		return nil, err
	}

	return &peer.SignedProposal{ProposalBytes: propBytes, Signature: signature}, nil
}

当成功获取足够的消息后，对签名的提案在背书服务上进行处理。

背书服务对提案的处理过程移步hperledger fabric 1.0 源码分析之背书模拟交易过程查看

最后，当拿到提案响应结果proposalResponse后，将末签名的提案、签名所有人、提案响应组合并签名返回客户端，由客户端调用发送至orderder排序。组合方法详情如下：

func CreateSignedTx(proposal *peer.Proposal, signer msp.SigningIdentity, resps ...*peer.ProposalResponse) (*common.Envelope, error) {
	if len(resps) == 0 {
		return nil, fmt.Errorf("At least one proposal response is necessary")
	}

	// the original header
	hdr, err := GetHeader(proposal.Header)
	if err != nil {
		return nil, fmt.Errorf("Could not unmarshal the proposal header")
	}

	// the original payload
	pPayl, err := GetChaincodeProposalPayload(proposal.Payload)
	if err != nil {
		return nil, fmt.Errorf("Could not unmarshal the proposal payload")
	}

	// check that the signer is the same that is referenced in the header
	// TODO: maybe worth removing?
	signerBytes, err := signer.Serialize()
	if err != nil {
		return nil, err
	}

	shdr, err := GetSignatureHeader(hdr.SignatureHeader)
	if err != nil {
		return nil, err
	}

	if bytes.Compare(signerBytes, shdr.Creator) != 0 {
		return nil, fmt.Errorf("The signer needs to be the same as the one referenced in the header")
	}

	// get header extensions so we have the visibility field
	hdrExt, err := GetChaincodeHeaderExtension(hdr)
	if err != nil {
		return nil, err
	}

	// ensure that all actions are bitwise equal and that they are successful
	var a1 []byte
	for n, r := range resps {
		if n == 0 {
			a1 = r.Payload
			if r.Response.Status != 200 {
				return nil, fmt.Errorf("Proposal response was not successful, error code %d, msg %s", r.Response.Status, r.Response.Message)
			}
			continue
		}

		if bytes.Compare(a1, r.Payload) != 0 {
			return nil, fmt.Errorf("ProposalResponsePayloads do not match")
		}
	}

	// fill endorsements
	endorsements := make([]*peer.Endorsement, len(resps))
	for n, r := range resps {
		endorsements[n] = r.Endorsement
	}

	// create ChaincodeEndorsedAction
	cea := &peer.ChaincodeEndorsedAction{ProposalResponsePayload: resps[0].Payload, Endorsements: endorsements}

	// obtain the bytes of the proposal payload that will go to the transaction
	propPayloadBytes, err := GetBytesProposalPayloadForTx(pPayl, hdrExt.PayloadVisibility)
	if err != nil {
		return nil, err
	}

	// serialize the chaincode action payload
	cap := &peer.ChaincodeActionPayload{ChaincodeProposalPayload: propPayloadBytes, Action: cea}
	capBytes, err := GetBytesChaincodeActionPayload(cap)
	if err != nil {
		return nil, err
	}

	// create a transaction
	taa := &peer.TransactionAction{Header: hdr.SignatureHeader, Payload: capBytes}
	taas := make([]*peer.TransactionAction, 1)
	taas[0] = taa
	tx := &peer.Transaction{Actions: taas}

	// serialize the tx
	txBytes, err := GetBytesTransaction(tx)
	if err != nil {
		return nil, err
	}

	// create the payload
	payl := &common.Payload{Header: hdr, Data: txBytes}
	paylBytes, err := GetBytesPayload(payl)
	if err != nil {
		return nil, err
	}

	// sign the payload
	sig, err := signer.Sign(paylBytes)
	if err != nil {
		return nil, err
	}

	// here's the envelope
	return &common.Envelope{Payload: paylBytes, Signature: sig}, nil
}