链码函数显示结构体值

Question

我正在尝试编写一个简单的链码，它使用结构来存储客户详细信息。我有一套可以正常工作的详细信息功能。我希望编写另一个 getDetails 函数，它将 UID 作为参数并使用该 UID 打印客户的详细信息。需要帮助！

package main
import (
    "errors"
    "fmt"
    "github.com/hyperledger/fabric/core/chaincode/shim"
)
type Customer struct {
    UID     string
    Name    string
    Address struct {
        StreetNo string
        Country  string
    }
}
type SimpleChaincode struct {
}
func (t *SimpleChaincode) Init(stub shim.ChaincodeStubInterface) ([]byte, error) {
    fmt.Printf("initialization done!!!")
    fmt.Printf("initialization done!!!")
    return nil, nil
}
func (t *SimpleChaincode) setDetails(stub shim.ChaincodeStubInterface, args []string) ([]byte, error) {
    if len(args) < 3 {
        return nil, errors.New("insert Into Table failed. Must include 3 column values")
    }
    customer := &Customer{}
    customer.UID = args[0]
    customer.Name = args[1]
    customer.Address.Country = args[2]
    return nil, nil
}
func (t *SimpleChaincode) getDetails(stub shim.ChaincodeStubInterface, args []string) ([]byte, error) {
    //wish to print all details of an particular customer corresponding to the UID
    return nil, nil
}
func (t *SimpleChaincode) Invoke(stub shim.ChaincodeStubInterface) ([]byte, error) {
    function, args := stub.GetFunctionAndParameters()
    fmt.Printf("Inside Invoke %s", function)
    if function == "setDetails" {
        return t.setDetails(stub, args)
    } else if function == "getDetails" {
        return t.getDetails(stub, args)
    }
    return nil, errors.New("Invalid invoke function name. Expecting  "query"")
}
func main() {
    err := shim.Start(new(SimpleChaincode))
    if err != nil {
        fmt.Printf("Error starting Simple chaincode: %s", err)
    }
}

Answer 1

直到

现在我才知道Hyperledger，但是在查看了github文档之后，我发现您会使用stub.PutState来存储您的客户信息，然后使用stub.GetState将其取回。

由于这两种方法都请求字节切片，我的猜测是这样的：

func (t *SimpleChaincode) setDetails(stub shim.ChaincodeStubInterface, args []string) ([]byte, error) {
    if len(args) < 3 {
        return nil, errors.New("insert Into Table failed. Must include 3 column values")
    }
    customer := &Customer{}
    customer.UID = args[0]
    customer.Name = args[1]
    customer.Address.Country = args[2]
    raw, err := json.Marshal(customer)
    if err != nil {
        return nil, err
    }
    err := stub.PuState(customer.UID, raw)
    if err != nil {
        return nil, err
    }
    return nil, nil
}
func (t *SimpleChaincode) getDetails(stub shim.ChaincodeStubInterface, args []string) ([]byte, error) {
    if len(args) != 1 {
        return nil, errors.New("Incorrect number of arguments. Expecting name of the key to query")
    }
    return stub.GetState(args[0])
}