fabric-go-sdk简单用例

1. 下载fabric-go-sek

$ export GOPATH=/path/to/current
$ cd src/github.com/hyperledger
$ git clone -b v1.0.0-beta2 https://github.com/hyperledger/fabric-sdk-go.git

2. 下载依赖

$ cd fabric-sdk-go
$ make populate

3. 生成配置YAML文件和crypto目录

$ cat config.yaml
version: 1.0.0
channels:
  default:
    orderers:
      - orderer0
    peers:
      peer0:
        endorsingPeer: true
        chaincodeQuery: true
        ledgerQuery: true
        eventSource: true
peers:
  peer0:
    url: peer.example.com:7050
    grpcOptions:
      allow-insecure: false
      fail-fast: false
      keep-alive-permit: false
      keep-alive-time: 30s
      keep-alive-timeout: 30s
    tlsCACerts:
      path: /path/to/crypto/<orgname>/tlsca/tls-ca.pem
orderers:
  orderer0:
    url: orderer.example.com:7051
    grpcOptions:
      allow-insecure: false
      fail-fast: false
      keep-alive-permit: false
      keep-alive-time: 30s
      keep-alive-timeout: 30s
    tlsCACerts:
      path: /path/to/crypto/<orgname>/tlsca/tls-ca.pem
organizations:
  <orgname>:
    mspid: <orgname>
    peers:
      - peer0 
    cryptoPath: /path/to/crypto/<orgname>/users/{username}/msp
client:
  organization: <orgname>
  logging:
    level: info
  cryptoconfig:
    path: /path/to/crypto
  tls:
    enabled: false
  credentialStore:
    path: /tmp/state-store
    cryptostore:
      path: /tmp/msp
certificateAuthorities: {}

crypto的目录结果如下：

crypto/<orgname>/users/<user1>/msp/signcerts/<orgname>-user1-cert.pem
crypto/<orgname>/users/<user1>/msp/keystore/<orgname>-user1-key.pem
crypto/<orgname>/users/<user1>/msp/cacerts/<orgname>-ca.pem
crypto/<orgname>/users/<user1>/msp/tlscerts/<orgname>-tls-ca.pem
crypto/<orgname>/users/<user2>/msp/signcerts/<orgname>-user2-cert.pem
crypto/<orgname>/users/<user2>/msp/keystore/<orgname>-user2-key.pem
crypto/<orgname>/users/<user2>/msp/cacerts/<orgname>-ca.pem
crypto/<orgname>/users/<user2>/msp/tlscerts/<orgname>-tls-ca.pem
crypto/<orgname>/users/<user3>/msp/...
crypto/<orgname>/tlsca/tlsca-jarli0709f1-cert.pem

在crypto/<orgname>根目录下面包含两个子目录users和tlsca，其中users下面为每一个用户包含其msp证书目录。

4. client端代码

package main

import (
    "log"
    "os"

    "github.com/hyperledger/fabric-sdk-go/pkg/client/channel"
    "github.com/hyperledger/fabric-sdk-go/pkg/common/errors/retry"
    "github.com/hyperledger/fabric-sdk-go/pkg/core/config"
    "github.com/hyperledger/fabric-sdk-go/pkg/fabsdk"
)

const (
    channelID   = "<channelname>"
    chaincodeID = "<chaincodename>"
    mspID       = "<orgname>"
    userID      = "<username>"
)

func main() {
    configOpt := config.FromFile("./config.yaml")
    sdk, err := fabsdk.New(configOpt)
    if err != nil {
        log.Fatalf("Failed to create new SDK: %v\n", err)
        return
    }
    defer sdk.Close()

    clientChannelContext := sdk.ChannelContext(channelID, fabsdk.WithUser(userID), fabsdk.WithOrg(mspID))
    client, err := channel.New(clientChannelContext)
    if err != nil {
        log.Fatalf("Failed to create new channel client: %v\n", err)
        return
    }

    var response channel.Response
    if len(os.Args) > 1 && os.Args[1] == "invoke" {
        response, err = client.Execute(channel.Request{ChaincodeID: chaincodeID, Fcn: "invoke", Args: [][]byte{[]byte("a"), []byte("b"), []byte("10")}}, 
                                       channel.WithRetry(retry.DefaultChannelOpts))
    } else {
        response, err = client.Query(channel.Request{ChaincodeID: chaincodeID, Fcn: "query", Args: [][]byte{[]byte("b")}},
                                     channel.WithRetry(retry.DefaultChannelOpts))
    }
    if err != nil {
        log.Fatalf("Failed to call client: %v\n", err)
        return
    }

    log.Printf("Result=(%v)\n", string(response.Payload))
}

这段代码是从SDK的e2e.go里面提取出来的，调用balanceTransfer的query和invoke功能。

编译运行：

$ export GOPATH=/path/to/fabric-go-sdk
$ go build test.go
$ ./test
2020/07/10 10:12:55 Result=(100)