三、hyperledger fabric 开发第一个智能合约
完成一个简单的智能合约demo
一、编写智能合约代码HelloWorld.go,go语言实现,代码很简单,每个合约包含两个方法,Init、Invoke。 ```Go hljs package main import ( "fmt" "github.com/hyperledger/fabric/core/chaincode/shim" "github.com/hyperledger/fabric/protos/peer" ) type Helloworld struct { } func (t * Helloworld) Init(stub shim.ChaincodeStubInterface) peer.Response{ args:= stub.GetStringArgs() err := stub.PutState(args[0],[]byte(args[1])) if err != nil { shim.Error(err.Error()) } return shim.Success(nil) } func (t *Helloworld) Invoke (stub shim.ChaincodeStubInterface) peer.Response{ fn, args := stub.GetFunctionAndParameters() if fn =="set" { return t.set(stub, args) }else if fn == "get"{ return t.get(stub , args) } return shim.Error("Invoke fn error") } func (t *Helloworld) set(stub shim.ChaincodeStubInterface , args []string) peer.Response{ err := stub.PutState(args[0],[]byte(args[1])) if err != nil { return shim.Error(err.Error()) } return shim.Success(nil) } func (t *Helloworld) get (stub shim.ChaincodeStubInterface, args [] string) peer.Response{ value, err := stub.GetState(args[0]) if err != nil { return shim.Error(err.Error()) } return shim.Success(value) } func main(){ err := shim.Start(new(Helloworld)) if err != nil { fmt.Println("start error") } } ``` ![](data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw== "点击并拖拽以移动") 二、将代码文件夹拷贝到fabric-samples下面的chaincode文件夹 ![](https://img.learnblockchain.cn/2020/08/20_/952230054.png)![](data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw== "点击并拖拽以移动") 三、进入到fabric-samples/chaincode-docker-devmode,启动网络 docker-compose -f docker-compose-simple.yaml up 四、新开一个终端,编译链码,并启动 docker exec -it chaincode bash cd hello/ go build ![](https://img.learnblockchain.cn/2020/08/20_/533888175.png)![](data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw== "点击并拖拽以移动") CORE_PEER_ADDRESS=peer:7052 CORE_CHAINCODE_ID_NAME=mycc:0 ./hello ![](https://img.learnblockchain.cn/2020/08/20_/345714447.png)![](data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw== "点击并拖拽以移动") 五、新开一个终端,进入docker容器,操作链码 docker exec -it cli bash 安装链码 peer chaincode install -p chaincodedev/chaincode/hello -n mycc -v 0 ![](https://img.learnblockchain.cn/2020/08/20_/391878182.png)![](data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw== "点击并拖拽以移动") 实例化链码 peer chaincode instantiate -n mycc -v 0 -c '{"Args":["str","HelloWorld"]}' -C myc ![](https://img.learnblockchain.cn/2020/08/20_/534973869.png)![](data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw== "点击并拖拽以移动") 查询链码 peer chaincode query -n mycc -c '{"Args":["get","str"]}' -C myc ![](https://img.learnblockchain.cn/2020/08/20_/97968008.png)![](data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw== "点击并拖拽以移动") 修改链码 peer chaincode invoke -n mycc -c '{"Args":["set","str","newHelloWorld"]}' -C myc ![](https://img.learnblockchain.cn/2020/08/20_/460237105.png)![](data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw== "点击并拖拽以移动") 再次查询 ![](https://img.learnblockchain.cn/2020/08/20_/436529087.png)![](data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw== "点击并拖拽以移动") 至此,第一个智能合约demo完成了。
一、编写智能合约代码HelloWorld.go,go语言实现,代码很简单,每个合约包含两个方法,Init、Invoke。
package main
import (
"fmt"
"github.com/hyperledger/fabric/core/chaincode/shim"
"github.com/hyperledger/fabric/protos/peer"
)
type Helloworld struct {
}
func (t * Helloworld) Init(stub shim.ChaincodeStubInterface) peer.Response{
args:= stub.GetStringArgs()
err := stub.PutState(args[0],[]byte(args[1]))
if err != nil {
shim.Error(err.Error())
}
return shim.Success(nil)
}
func (t *Helloworld) Invoke (stub shim.ChaincodeStubInterface) peer.Response{
fn, args := stub.GetFunctionAndParameters()
if fn =="set" {
return t.set(stub, args)
}else if fn == "get"{
return t.get(stub , args)
}
return shim.Error("Invoke fn error")
}
func (t *Helloworld) set(stub shim.ChaincodeStubInterface , args []string) peer.Response{
err := stub.PutState(args[0],[]byte(args[1]))
if err != nil {
return shim.Error(err.Error())
}
return shim.Success(nil)
}
func (t *Helloworld) get (stub shim.ChaincodeStubInterface, args [] string) peer.Response{
value, err := stub.GetState(args[0])
if err != nil {
return shim.Error(err.Error())
}
return shim.Success(value)
}
func main(){
err := shim.Start(new(Helloworld))
if err != nil {
fmt.Println("start error")
}
}
二、将代码文件夹拷贝到fabric-samples下面的chaincode文件夹
三、进入到fabric-samples/chaincode-docker-devmode,启动网络
docker-compose -f docker-compose-simple.yaml up
四、新开一个终端,编译链码,并启动
docker exec -it chaincode bash
cd hello/
go build
CORE_PEER_ADDRESS=peer:7052 CORE_CHAINCODE_ID_NAME=mycc:0 ./hello
五、新开一个终端,进入docker容器,操作链码
docker exec -it cli bash
安装链码
peer chaincode install -p chaincodedev/chaincode/hello -n mycc -v 0
实例化链码
peer chaincode instantiate -n mycc -v 0 -c '{"Args":["str","HelloWorld"]}' -C myc
查询链码
peer chaincode query -n mycc -c '{"Args":["get","str"]}' -C myc
修改链码
peer chaincode invoke -n mycc -c '{"Args":["set","str","newHelloWorld"]}' -C myc
再次查询
至此,第一个智能合约demo完成了。
区块链技术网。
- 发表于 2020-08-19 20:54
- 阅读 ( 1250 )
- 学分 ( 53 )
- 分类:Fabric
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