Fabric-samples开发模式下chaincode操作流程及错误锦集

首先简单介绍一下此次流程步骤，在go build阶段出现问题，然后说明一下如何解决的问题。 出现的问题的提示代码为： 问题1、go: github.com/hyperledger/fabric-chaincode-go@v0.0.0-20190823162523-04390e015b85: Get "https://proxy.golang.org/github.com/hyperledger/fabric-chaincode-go/@v/v0.0.0-20190823162523-04390e015b85.mod": dial tcp 216.58.200.49:443: connect: connection refused

解决方案1：执行以下命令 $ go env -w GO111MODULE=on $ go env -w GOPROXY=https://goproxy.io,direct 然后再执行go build，不再出现此类错误

问题2：go build github.com/hyperledger/fabric-samples/chaincode/sacc: copying /tmp/go-build462413933/b001/exe/a.out: open sacc: permission denied

解决方案2： 经分析，应该是权限问题，尝试很多办法，包括更改文件夹权限777等，最终发现更改文件夹权限无法作用到docker容器中，所以采用直接简单的一种方法，那就是以root身份进入容器执行各种操作。进入chaincode容器的指令如下：$ docker exec -it -u root chaincode sh

问题3：Error starting SimpleAsset chaincode: flag 'peer.address' must be set

解决方案3：尚未解决，各位大佬如果知道解决方案请留言

Fabric-samples开发模式下chaincode操作流程步骤：

1、在$GOPATH下的src文件夹下建立一个sacc文件，并创建一个sacc.go文件进行chaincode编码

$ mkdir -p $GOPATH/src/sacc && cd $GOPATH/src/sacc $ touch sacc.go

2、在sacc.go中进行编码，编写Init、Invoke、set、get等函数，进行整合。具体的代码如下：

package main import( "fmt" "github.com/hyperledger/fabric-chaincode-go/shim" "github.com/hyperledger/fabric-protos-go/peer" ) // SimpleAsset implements a simple chaincode to manage an asset type SimpleAsset struct { } // Init is called during chaincode Instantiation to initialize any data // Note that chaincodeee upgrade also calls this function to reset or to migrate data, // so be careful to avoid a scenario where you inadvertently clobber your ledger's data func (t *SimpleAsset) Init(stub shim.ChaincodeStubInterface) peer.Response{ // Get the args from the transaction proposal args := stub.GetStringArgs() if len(args) != 2 { return shim.Error("Incorrect arguments. Expection a key and a value...") } // Set up any variables or assets here by calling stub.PutStata() // We store the key and the value on the ledger err := stub.PutState(args[0], []byte(args[1])) if err != nil { return shim.Error(fmt.Sprintf("Failed to create asset: %s", args[0])) } return shim.Success(nil) } // Invoke is called per transaction on the chaincode. Each transaction is either a 'get' // or a 'set' on the asset created by Init function. The 'set' method may create a new // asset by specifying a new key-value pair. func (t *SimpleAsset) Invoke(stub shim.ChaincodeStubInterface) peer.Response{ // Extract the function and args from the transaction proposal fn, args := stub.GetFunctionAndParameters() var result string var err error if fn == "set" { result, err = set(stub, args) }else{ result, err = get(stub, args) } if err != nil { return shim.Error(err.Error()) } // Return the result as success payload return shim.Success([]byte(result)) } // Set stores the asset (both key and value) on the ledger. If the key exists, // it will override the value with the new one func set(stub shim.ChaincodeStubInterface, args []string) (string, error){ if len(args) != 2 { return "", fmt.Errorf("Incorrect arguments. Expecting a key and a value") } err := stub.PutState(args[0], []byte(args[1])) if err != nil { return "", fmt.Errorf("Failed to set asset: %s", args[0]) } return args[1], nil } // Get returns the value of the specified asset key func get(stub shim.ChaincodeStubInterface, args []string) (string, error){ if len(args) != 1 { return "", fmt.Errorf("Incorrect arguments. Expecting a key and a value") } value, err := stub.GetState(args[0]) if err != nil { return "", fmt.Errorf("Failed to set asset: %s with error: %s", args[0], err) } if value == nil { return "", fmt.Errorf("Asset not found: %s", args[0]) } return string(value), nil } // main function starts up the chaincode in the container during instantiate func main() { err := shim.Start(new(SimpleAsset)) if err != nil { fmt.Printf("Error starting SimpleAsset chaincode: %s", err) } }

3、编译chaincode

$ go get -u --tags nopkcs11 github.com/hyperledger/fabric-chaincode-go/shim $ go build --tags nopkcs11

4、在开发模式下进行测试（在/fabric-samples/chaincode-docker-devmode目录下启动3个终端）

（tip：需要先安装fabric-samples, 在我之前博客中有篇专门介绍如何安装）

$ cd hyerledger/fabric-samples/chaincode-docker-devmode

终端1：

$ docker-compose -f docker-compose-simple.yaml up

终端2：

$ docker exec -it chaincode sh /opt/gopath/src/chaincode $ cd sacc /opt/gopath/src/chaincode/sacc $ go build

当执行到这里出现错误：go: github.com/hyperledger/fabric-chaincode-go@v0.0.0-20190823162523-04390e015b85: Get "https://proxy.golang.org/github.com/hyperledger/fabric-chaincode-go/@v/v0.0.0-20190823162523-04390e015b85.mod": dial tcp 216.58.200.49:443: connect: connection refused 解决方法参考上述解决方案1，截图 如下 ： 上面报的443错误已解决，但是go build后出现新的错误：go build github.com/hyperledger/fabric-samples/chaincode/sacc: copying /tmp/go-build462413933/b001/exe/a.out: open sacc: permission denied 经分析，应该是权限问题，尝试很多办法，包括更改文件夹权限777等，最终发现更改文件夹权限无法作用到docker容器中，所以采用直接简单的一种方法，那就是以root身份进入容器执行各种操作。

更改终端2指令（最终版）如下：

$ docker exec -it -u root chaincode sh /opt/gopath/src/chaincode $ cd sacc /opt/gopath/src/chaincode/sacc $ go env -w GO111MODULE=on /opt/gopath/src/chaincode/sacc $ go env -w GOPROXY=https://goproxy.io,direct /opt/gopath/src/chaincode/sacc $ go build /opt/gopath/src/chaincode/sacc $ CORE_PEEER_ADDRESS=peer:7051 CORE_CHAINCODE_ID_NAME=mycc:0 ./sacc

又出现了错误：Error starting SimpleAsset chaincode: flag 'peer.address' must be set 尚未解决

终端3：

$ docker exec -it cli bash $ peer chaincode install -p chaincodedev/chaincode/sacc -n mycc -v 0 $ peer chaincode instantiate -n mycc -v 0 -c '{"Args":["a","10"]}' -C myc $ peer chaincode invoke -n mycc -v 0 -c '{"Args":["set","a","20"]}' -C myc $ peer chaincode invoke -n mycc -v 0 -c '{"Args":["query","a"]}' -C myc