Hyperledger Fabric学习（八）Fabric SDK调用链码、监听链码

Fabric SDK调用流程

1、文字描述

• 获取FabricSDK

sdk, err := fabsdk.New(config.FromFile(sdkConfig))

• 加入Org、User信息

rcp := sdk.Context(fabsdk.WithOrg(orgName), fabsdk.WithUser(userName))

• 获取指定Channel的Channel Provider

ccp := sdk.ChannelContext(channelID, fabsdk.WithUser(userName))

• 获取该Channel的Channel Client

cc, err := channel.New(ccp)

• 封装channel.Request

var req =  &channel.Request{
      ChaincodeID: chaincodeID, 
      Fcn          fcn, 
      Args         args,
      TransientMap transientMap,
}

• 封装channel.RequestOption

var opts = []channel.RequestOption
opts = append(opts, channel.WithTargetEndpoints(peer...)
opts = append(opts, channel.WithOrdererEndpoint(orderers...))

• 调用链码返回结果

// invoke调用
response, err := cc.Execute(*req, opts...)
// query调用
response, err := cc.Query(*req, opts...)

• 获取该Channel的Event Client

ec, err := event.New(ccp, event.WithBlockEvents())

• 监听区块/链码/交易事件

// 监听区块事件
blockReg, notify, err := ec.RegisterBlockEvent()
// 监听链码事件
chaincodeReg, notify, err := ec.RegisterChaincodeEvent(chaincodeId, ".*")
// 监听交易事件
txReg, notify, err := ec.RegisterTxStatusEvent(txId)

• 获取数据

for {
    select {
    case event := <- notify:
          // todo
   }
}

• 取消监听

// 取消监听区块事件
ec.Unregister(blockReg)
// 取消监听链码事件
ec.Unregister(chaincodeReg)
// 取消监听交易事件
ec.Unregister(txReg)

2、图解