说明
HyperLedger Fabric的Golang SDK终于调通了，眼泪哗哗地。。 @2018-07-28 13:36:06
操作演示、配置文件和代码讲解视频在网易云课堂《HyperLeger Fabric进阶实战课》第五章中。
获取示例代码
源代码托管在github: 源代码地址，fabric-sdk-go
go get github.com/introclass/hyperledger-fabric-sdks-usage
cd $GOPATH/src/github.com/introclass/hyperledger-fabric-sdks-usage/go
准备msp和tls证书
将你自己环境的crypto-config复制到hyperledger-fabric-sdks-usage/go中。
crypto-config中只需要包含需要的msp和tls证书，需要哪些证书在调用go-sdk的程序使用的config.yaml中指定了。
查询合约
01-query中通过go-sdk做了一个最简单操作：链接peer，调用合约，查询账本。
$ cd 01-query
$ ./01-query
AdminIdentify is found:
&{Admin peers.member1.example.com [45 45 45 45 45 66 69 71 73 78
...
69 45 45 45 45 45 10] 0xc420329a90}
response is key1value
源代码如下：
package main
import (
"fmt"
"github.com/hyperledger/fabric-sdk-go/pkg/client/channel"
mspclient "github.com/hyperledger/fabric-sdk-go/pkg/client/msp"
"github.com/hyperledger/fabric-sdk-go/pkg/core/config"
"github.com/hyperledger/fabric-sdk-go/pkg/fabsdk"
"log"
)
func main() {
//读取配置文件，创建SDK
configProvider := config.FromFile("./config.yaml")
sdk, err := fabsdk.New(configProvider)
if err != nil {
log.Fatalf("create sdk fail: %s
", err.Error())
}
//读取配置文件(config.yaml)中的组织(member1.example.com)的用户(Admin)
mspClient, err := mspclient.New(sdk.Context(), mspclient.WithOrg("member1.example.com"))
if err != nil {
log.Fatalf("create msp client fail: %s
", err.Error())
}
adminIdentity, err := mspClient.GetSigningIdentity("Admin")
if err != nil {
log.Fatalf("get admin identify fail: %s
", err.Error())
} else {
fmt.Println("AdminIdentify is found:")
fmt.Println(adminIdentity)
}
//调用合约
channelProvider := sdk.ChannelContext("mychannel",
fabsdk.WithUser("Admin"),
fabsdk.WithOrg("member1.example.com"))
channelClient, err := channel.New(channelProvider)
if err != nil {
log.Fatalf("create channel client fail: %s
", err.Error())
}
var args [][]byte
args = append(args, []byte("key1"))
request := channel.Request{
ChaincodeID: "mycc",
Fcn: "query",
Args: args,
}
response, err := channelClient.Query(request)
if err != nil {
log.Fatal("query fail: ", err.Error())
} else {
fmt.Printf("response is %s
", response.Payload)
}
}
