fabric1.2研究笔记(2)-系统Chain Code初始化

上一篇介绍了已有的scc，但如果需要构建一个自己的scc则必须了解它是如何生效的。

首先在scc目录下找到统一的入口register.go

// CreateSysCCs creates all of the system chaincodes which are compiled into fabric
func CreateSysCCs(ccp ccprovider.ChaincodeProvider, p *Provider, aclProvider aclmgmt.ACLProvider) []*SystemChaincode {
	return builtInSystemChaincodes(ccp, p, aclProvider)
}

在peer/node/start.go内调用该方法

//Now that chaincode is initialized, register all system chaincodes.
	sccs := scc.CreateSysCCs(ccp, sccp, aclProvider)
	for _, cc := range sccs {
		sccp.RegisterSysCC(cc)
	}
	pb.RegisterChaincodeSupportServer(grpcServer.Server(), ccSrv)

第一段代码返回的时scc的配置，为代码内写死的一段配置

func builtInSystemChaincodes(ccp ccprovider.ChaincodeProvider, p *Provider, aclProvider aclmgmt.ACLProvider) []*SystemChaincode {
	return []*SystemChaincode{
		{
			Enabled:           true,
			Name:              "cscc",
			Path:              "github.com/hyperledger/fabric/core/scc/cscc",
			InitArgs:          nil,
			Chaincode:         cscc.New(ccp, p, aclProvider),
			InvokableExternal: true, // cscc is invoked to join a channel
		},
		{
			Enabled:           true,
			Name:              "lscc",
			Path:              "github.com/hyperledger/fabric/core/scc/lscc",
			InitArgs:          nil,
			Chaincode:         lscc.New(p, aclProvider),
			InvokableExternal: true, // lscc is invoked to deploy new chaincodes
			InvokableCC2CC:    true, // lscc can be invoked by other chaincodes
		},
		{
			Enabled:           true,
			Name:              "qscc",
			Path:              "github.com/hyperledger/fabric/core/scc/qscc",
			InitArgs:          nil,
			Chaincode:         qscc.New(aclProvider),
			InvokableExternal: true, // qscc can be invoked to retrieve blocks
			InvokableCC2CC:    true, // qscc can be invoked to retrieve blocks also by a cc
		},
	}
}

综上，它是通过获取定好的scc配置进行实例化，所以只需在此处添加类似路径即可完成自定义系统chain code的实例化。