智能合约使用02

合约文件sacc.go

//代码位置:
//fabric-samples/chaincode/sacc/sacc.go
//合约很简单就是kv储存、查询和更新的功能

package main

import (
	"fmt"
	"github.com/hyperledger/fabric/core/chaincode/shim"
	"github.com/hyperledger/fabric/protos/peer"
)


type SimpleAsset struct {
}

// 部署及初始化时调用此函数
// 代码升级时也会调用此函数重置和迁移数据
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. Expecting a key and a value")
	}

	// Set up any variables or assets here by calling stub.PutState()

	// 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)
}

// 消息路由函数
// 调用 set 或 get方法 
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 { // assume 'get' even if fn is nil
		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
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
func get(stub shim.ChaincodeStubInterface, args []string) (string, error) {
	if len(args) != 1 {
		return "", fmt.Errorf("Incorrect arguments. Expecting a key")
	}

	value, err := stub.GetState(args[0])
	if err != nil {
		return "", fmt.Errorf("Failed to get 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() {
	if err := shim.Start(new(SimpleAsset)); err != nil {
		fmt.Printf("Error starting SimpleAsset chaincode: %s", err)
	}
}

在宿主机下尝试进行编译

开启开发环境

在虚拟机内进行编译合约

在虚拟机内部署并运行合约

打包签名部署命令行

打包时附带lib

数据加密

最后更新于