更改fabcar示例hyperledger-fabric

Question

我已经使用hyperledger-fabric samples/fabcar示例有一段时间了，我能够在fabcar.go中添加更多字段和函数，但是当我完全更改字段时。我在部署时遇到错误。

下面是我在fabcar.go中所做更改的一个示例。

type Car struct {
Name  string `json:"Name"`
College  string `json:"College"`
DOB  string `json:"DOB"`
SecretCode  string `json:"SecretCode"`
    }

func (s *SmartContract) initLedger(APIstub shim.ChaincodeStubInterface) sc.Response {
cars := []Car{
    Car{Name: "name1", College: "college1", DOB: "dob1", SecretCode: "secretcode1"},
    Car{Name: "name2", College: "college2", DOB: "dob2", SecretCode: "secretcode2"},
    Car{Name: "name3", College: "college3", DOB: "dob3", SecretCode: "secretcode3"},
    Car{Name: "name4", College: "college4", DOB: "dob4", SecretCode: "secretcode4"},
    }
i := 0
for i < len(cars) {
    fmt.Println("i is ", i)
    carAsBytes, _ := json.Marshal(cars[i])
    APIstub.PutState("CAR"+strconv.Itoa(i), carAsBytes)
    fmt.Println("Added", cars[i])
    i = i + 1
}

return shim.Success(nil)
}

下面是我在运行startFabric.sh时得到的错误：

>Error: Error endorsing chaincode: rpc error: code = Unknown desc = Error starting container: Failed to generate platform-specific docker build: Error returned from build: 2 "# github.com/fabcar
chaincode/input/src/github.com/fabcar/fabcar.go:132: unknown Car field 'Make' in struct literal
chaincode/input/src/github.com/fabcar/fabcar.go:132: unknown Car field 'Model' in struct literal
chaincode/input/src/github.com/fabcar/fabcar.go:132: unknown Car field 'Colour' in struct literal
chaincode/input/src/github.com/fabcar/fabcar.go:132: unknown Car field 'Owner' in struct literal
chaincode/input/src/github.com/fabcar/fabcar.go:193: car.Owner undefined (type Car has no field or method Owner)
chaincode/input/src/github.com/fabcar/fabcar.go:211: car.Colour undefined (type Car has no field or method Colour)
"

我正在使用Mac OSX yosemite，我已经尝试通过删除所有数据并重新启动来清理docker，我还尝试重命名go文件，但都不起作用。我在这里做错了什么？

go build命令的输出：

>go build
../../../../../go/src/github.com/hyperledger/fabric/protos/peer/admin.pb.go:74:8: use of vendored package not allowed
../../../../../go/src/github.com/hyperledger/fabric/protos/peer/admin.pb.go:77:8: use of vendored package not allowed
../../../../../go/src/github.com/hyperledger/fabric/protos/peer/chaincode.pb.go:9:8: use of vendored package not allowed
../../../../../go/src/github.com/hyperledger/fabric/protos/peer/init.go:21:2: use of vendored package not allowed
../../../../../go/src/github.com/hyperledger/fabric/bccsp/pkcs11/conf.go:25:2: use of vendored package not allowed
../../../../../go/src/github.com/hyperledger/fabric/protos/peer/admin.pb.go:80:2: use of vendored package not allowed
../../../../../go/src/github.com/hyperledger/fabric/protos/peer/admin.pb.go:81:2: use of vendored package not allowed
../../../../../go/src/github.com/hyperledger/fabric/common/flogging/grpclogger.go:21:2: use of vendored package not allowed

Answer 1

您似乎遇到了编译错误，而您将Car的结构改为

type Car struct {
     Name        string `json:"Name"`
     College     string `json:"College"`
     DOB         string `json:"DOB"`
     SecretCode  string `json:"SecretCode"`
}

虽然许多保留在fabcar.go中的函数仍在尝试使用这种结构“老式”方式，但假设以前的模型：

type Car struct {
        Make   string `json:"make"`
        Model  string `json:"model"`
        Colour string `json:"colour"`
        Owner  string `json:"owner"`
}

例如：

func (s *SmartContract) createCar(APIstub shim.ChaincodeStubInterface, args []string) sc.Response {

        if len(args) != 5 {
                return shim.Error("Incorrect number of arguments. Expecting 5")
        }

        var car = Car{Make: args[1], Model: args[2], Colour: args[3], Owner: args[4]}

        carAsBytes, _ := json.Marshal(car)
        APIstub.PutState(args[0], carAsBytes)

        return shim.Success(nil)
}

我建议重用Car结构的声明，只需创建自己的结构并正确使用即可：

type Student struct {
     Name        string `json:"Name"`
     College     string `json:"College"`
     DOB         string `json:"DOB"`
     SecretCode  string `json:"SecretCode"`
}

和

func (s *SmartContract) initLedger(APIstub shim.ChaincodeStubInterface) sc.Response {
   cars := []Student{
    Student{Name: "name1", College: "college1", DOB: "dob1", SecretCode: "secretcode1"},
    Student{Name: "name2", College: "college2", DOB: "dob2", SecretCode: "secretcode2"},
    Student{Name: "name3", College: "college3", DOB: "dob3", SecretCode: "secretcode3"},
    Student{Name: "name4", College: "college4", DOB: "dob4", SecretCode: "secretcode4"},
    }
   i := 0
   for i < len(cars) {
      fmt.Println("i is ", i)
      carAsBytes, _ := json.Marshal(cars[i])
      APIstub.PutState("CAR"+strconv.Itoa(i), carAsBytes)
      fmt.Println("Added", cars[i])
      i = i + 1
   } 

   return shim.Success(nil)
}

Answer 2

好了，检查这个链接fabcar.go chaincode of hyperledger does not accept the changes and modification and always run previous chaincode，你会在那里找到答案，当你与源代码交互时，不要忘记删除它以前使用过的模块，以完全暗示你的代码更改！