使用go-sdk调用链码，以测试网络为例
前置-需要在 fabric测试网络中成功安装链码，如果没有安装，可以先看这篇进行安装fabric2.4.1安装链码
windows机器上go的版本不能是1.1.9会出现异常错误，可以使用1.17版本
此篇文章仅仅是作为可以把测试网络安装的go链码跑通的例子
第一步 创建项目 从测试网络中下载peerorganization和orderorganization目录文件
将下载好的文件合并放到crypto-config目录下，放到项目的根目录下即可
第二步 导入config.ymal文件
编写config模板，根据自己的目录和IP进行对应，放到根目录下
version: 1.0.0
client:
organization: org1
logging:
level: info
cryptoconfig:
path: #D:/go/gocode/src/studentApp/crypto-config
channels:
# multi-org test channel
mychannel:
peers:
peer0.org1.example.com:
endorsingPeer: true
chaincodeQuery: true
ledgerQuery: true
eventSource: true
peer1.org1.example.com:
endorsingPeer: true
chaincodeQuery: true
ledgerQuery: true
eventSource: true
peer0.org2.example.com:
endorsingPeer: true
chaincodeQuery: true
ledgerQuery: true
eventSource: true
peer1.org2.example.com:
endorsingPeer: true
chaincodeQuery: true
ledgerQuery: true
eventSource: true
policies:
queryChannelConfig:
minResponses: 1
maxTargets: 1
retryOpts:
attempts: 5
initialBackoff: 500ms
maxBackoff: 5s
backoffFactor: 2.0
#
# list of participating organizations in this network
#
organizations:
org1:
mspid: Org1MSP
# This org's MSP store (absolute path or relative to client.cryptoconfig)
cryptoPath: D:/go/gocode/src/studentApp/crypto-config/peerOrganizations/org1.example.com/users/[email protected]/msp
peers:
- peer0.org1.example.com
- peer1.org1.example.com
Admin:
cert:
path: D:\go\gocode\src\studentApp\crypto-config\peerOrganizations\org1.example.com\users\[email protected]\msp\signcerts\[email protected]-cert.pem
User1:
cert:
path: D:\go\gocode\src\studentApp\crypto-config\peerOrganizations\org1.example.com\users\[email protected]\msp\signcerts\[email protected]-cert.pem
org2:
mspid: Org2MSP
# This org's MSP store (absolute path or relative to client.cryptoconfig)
cryptoPath: D:/go/gocode/src/studentApp/crypto-config/peerOrganizations/org2.example.com/users/[email protected]/msp
peers:
- peer0.org2.example.com
- peer1.org2.example.com
users:
Admin:
cert:
path: D:\go\gocode\src\studentApp\crypto-config\peerOrganizations\org2.example.com\users\[email protected]\msp\signcerts\[email protected]-cert.pem
User1:
cert:
path: D:\go\gocode\src\studentApp\crypto-config\peerOrganizations\org2.example.com\users\[email protected]\msp\signcerts\[email protected]-cert.pem
# Orderer Org name
ordererorg:
# Membership Service Provider ID for this organization
mspID: OrdererMSP
# Needed to load users crypto keys and certs for this org (absolute path or relative to global crypto path, DEV mode)
cryptoPath: D:/go/gocode/src/studentApp/crypto-config/ordererOrganizations/example.com/users/[email protected]/msp
orderers:
orderer.example.com:
# [Optional] Default: Infer from hostname
url: orderer.example.com:7050
grpcOptions:
ssl-target-name-override: orderer.example.com
keep-alive-time: 0s
keep-alive-timeout: 20s
keep-alive-permit: false
fail-fast: false
allow-insecure: false
tlsCACerts:
# Certificate location absolute path
path: D:/go/gocode/src/studentApp/crypto-config/ordererOrganizations/example.com/tlsca/tlsca.example.com-cert.pem
peers:
peer0.org1.example.com:
# this URL is used to send endorsement and query requests
# [Optional] Default: Infer from hostname
url: peer0.org1.example.com:7051
grpcOptions:
ssl-target-name-override: peer0.org1.example.com
# These parameters should be set in coordination with the keepalive policy on the server,
# as incompatible settings can result in closing of connection.
# When duration of the 'keep-alive-time' is set to 0 or less the keep alive client parameters are disabled
keep-alive-time: 0s
keep-alive-timeout: 20s
keep-alive-permit: false
fail-fast: false
# allow-insecure will be taken into consideration if address has no protocol defined, if true then grpc or else grpcs
allow-insecure: false
#grpcOptions:
# ssl-target-name-override: peer0.org1.example.com
tlsCACerts:
# Certificate location absolute path
path: D:/go/gocode/src/studentApp/crypto-config/peerOrganizations/org1.example.com/tlsca/tlsca.org1.example.com-cert.pem
peer0.org2.example.com:
url: peer0.org2.example.com:9051
#grpcOptions:
# ssl-target-name-override: peer0.org2.example.com
grpcOptions:
ssl-target-name-override: peer0.org2.example.com
# These parameters should be set in coordination with the keepalive policy on the server,
# as incompatible settings can result in closing of connection.
# When duration of the 'keep-alive-time' is set to 0 or less the keep alive client parameters are disabled
keep-alive-time: 0s
keep-alive-timeout: 20s
keep-alive-permit: false
fail-fast: false
# allow-insecure will be taken into consideration if address has no protocol defined, if true then grpc or else grpcs
allow-insecure: false
tlsCACerts:
path: D:/go/gocode/src/studentApp/crypto-config/peerOrganizations/org2.example.com/tlsca/tlsca.org2.example.com-cert.pem
第三步 ，编写main函数
package main
import (
"fmt"
"github.com/hyperledger/fabric-sdk-go/pkg/client/channel"
"github.com/hyperledger/fabric-sdk-go/pkg/core/config"
"github.com/hyperledger/fabric-sdk-go/pkg/fabsdk"
)
func main() {
// 创建 SDK 实例
sdk, err := fabsdk.New(config.FromFile("config.yaml"))
if err != nil {
fmt.Printf("failed to create SDK instance: %s\n", err)
return
}
defer sdk.Close()
// 获取通道客户端
clientChannelContext := sdk.ChannelContext("mychannel", fabsdk.WithUser("User1"), fabsdk.WithOrg("Org1"))
channelClient, err := channel.New(clientChannelContext)
if err != nil {
fmt.Printf("failed to create channel client: %s\n", err)
return
}
// 构建链码调用请求
//查询数据
QueryStudent := channel.Request{
ChaincodeID: "studentcontract",
Fcn: "QueryStudent",
Args: [][]byte{
[]byte("1")},
}
// 发送链码调用请求
response, err := channelClient.Execute(QueryStudent)
if err != nil {
fmt.Printf("failed to call chaincode: %s\n", err)
return
}
fmt.Printf("response payload: %s\n", string(response.Payload))
//增加学生
CreateStudent := channel.Request{
ChaincodeID: "studentcontract",
Fcn: "CreateStudent",
Args: [][]byte{
[]byte("3"), []byte("ww"), []byte("28"), []byte("周口")},
}
res, err := channelClient.Execute(CreateStudent)
fmt.Printf("response payload: %s\n", string(res.Payload))
//查询全部学生
queryAllStudent := channel.Request{
ChaincodeID: "studentcontract",
Fcn: "QueryAllStudents",
Args: [][]byte{
},
}
execute, err := channelClient.Execute(queryAllStudent)
if err!=nil {
fmt.Printf("failed to call chaincode: %s\n", err)
}
fmt.Printf("response payload: %s\n", string(execute.Payload))
}
如果使用的是自己的链码，根据自己链码的实际情况进行修改即可