基于hyperledger fabric 联盟链 + vue cli的项目搭建完整教程
四、go语言开发chaincode
1. chaincode（基于Go语言实现）
编写trail.go放在chaincode文件夹的trail文件夹下
声明
package main
import(
"fmt"
//"encoding/json"
"bytes"
"github.com/hyperledger/fabric/core/chaincode/shim"
"github.com/hyperledger/fabric/protos/peer"
)
定义区块链存储的结构体
type point struct{
locationx float64 `json:"locationx"`
locationy float64 `json:"locationy"`
speed float64 `json:"speed"`
locatetime int `json:"locatetime"`
direction float64 `json:"direction"`
height float64 `json:"height"`
}
type Trail struct {
username string `json:"username"`
userid string `json:"userid"`
devid string `json:"devid"`
devstr string`json:"devstr"`
trid string `json:"trid"`
points [100]point `json:"points"`
mile float64 `json:"mile"`
state bool `json:"state"`
}
合约的Init函数
func (t *TrailChaincode) Init(stub shim.ChaincodeStubInterface) peer.Response {
return shim.Success(nil)
}
修改Invoke函数，增加自己需要调用的合约函数
func (t *TrailChaincode) Invoke(stub shim.ChaincodeStubInterface) peer.Response {
fn , args := stub.GetFunctionAndParameters()
if fn == "insertTrail" {
return t.insertTrail(stub,args)
} else if fn == "searchAllTrail" {
return t.searchAllTrail(stub,args)
} else if fn == "searchOneTrail" {
return t.searchOneTrail(stub,args)
} else if fn == "deleteTrail" {
return t.deleteTrail(stub,args)
}
return shim.Error("Invoke 调用方法有误！")
}
账本增加数据：增加汽车行驶轨迹，写入账本，这里我们采用json存储（couchDB存储）
func (t *TrailChaincode) insertTrail(stub shim.ChaincodeStubInterface , args []string) peer.Response{
//序列化
// trail := Trail{}
// jsonStr := args[0]
// err := json.Unmarshal([]byte(jsonStr), &trail)
// if err != nil {
// return shim.Error(err.Error())
// }
// accBytes, err := json.Marshal(trail)
// if err != nil {
// return shim.Error(err.Error())
// }
//保存数据
// err = stub.PutState(trail.trid, accBytes)
Trid := args[0]
jsonStr := args[1]
err := stub.PutState(Trid, []byte(jsonStr))
if err != nil {
shim.Error(err.Error())
}
return shim.Success([]byte("insert 写入账本成功！"))
}
//插入指定轨迹
账本删除数据：删除汽车行驶轨迹，从账本删除
func (t *TrailChaincode) deleteTrail(stub shim.ChaincodeStubInterface , args []string) peer.Response{
Trid := args[0]
err := stub.DelState(Trid)
if err != nil {
shim.Error(err.Error())
}
return shim.Success([]byte("delete 删除账本成功！"))
}
//删除指定轨迹
账本查询所有轨迹：从账本执行所有数据查询
func (t *TrailChaincode) searchAllTrail(stub shim.ChaincodeStubInterface, args []string) peer.Response{
fmt.Println("start searchAllTrail")
// 获取所有用户的票数
resultIterator, err := stub.GetStateByRange("","")
if err != nil {
return shim.Error("查询所有的轨迹失败！")
}
defer resultIterator.Close()
var buffer bytes.Buffer
buffer.WriteString("[")
isWritten := false
for resultIterator.HasNext() {
queryResult , err := resultIterator.Next()
if err != nil {
return shim.Error(err.Error())
}
if isWritten == true {
buffer.WriteString(",")
}
buffer.WriteString(string(queryResult.Value))
isWritten = true
}
buffer.WriteString("]")
fmt.Printf("查询结果：\n%s\n",buffer.String())
fmt.Println("end searchAllTrail")
return shim.Success(buffer.Bytes())
}
//查询所有的轨迹
根据Id进行重要轨迹的查询
func (t *TrailChaincode) searchOneTrail(stub shim.ChaincodeStubInterface, args []string) peer.Response{
fmt.Println("start searchOneTrail")
// 获取所有用户的票数
trid := args[0]
result, err := stub.GetState(trid)
if err != nil {
return shim.Error("查询所有的轨迹失败！")
}
return shim.Success(result)
}
2. 链码的安装
Docker：docker-compose.yml配置（注意路径对应，并且开启配置couchDB）
#
# Copyright IBM Corp All Rights Reserved
#
# SPDX-License-Identifier: Apache-2.0
#
version: '2'
networks:
basic:
services:
ca.example.com:
image: hyperledger/fabric-ca
environment:
- FABRIC_CA_HOME=/etc/hyperledger/fabric-ca-server
- FABRIC_CA_SERVER_CA_NAME=ca.example.com
- FABRIC_CA_SERVER_CA_CERTFILE=/etc/hyperledger/fabric-ca-server-config/ca.org1.example.com-cert.pem
- FABRIC_CA_SERVER_CA_KEYFILE=/etc/hyperledger/fabric-ca-server-config/4239aa0dcd76daeeb8ba0cda701851d14504d31aad1b2ddddbac6a57365e497c_sk
ports:
- "7054:7054"
command: sh -c 'fabric-ca-server start -b admin:adminpw -d'
volumes:
- ./crypto-config/peerOrganizations/org1.example.com/ca/:/etc/hyperledger/fabric-ca-server-config
container_name: ca.example.com
networks:
- basic
orderer.example.com:
container_name: orderer.example.com
image: hyperledger/fabric-orderer
environment:
- ORDERER_GENERAL_LOGLEVEL=debug
- ORDERER_GENERAL_LISTENADDRESS=0.0.0.0
- ORDERER_GENERAL_GENESISMETHOD=file
- ORDERER_GENERAL_GENESISFILE=/etc/hyperledger/configtx/genesis.block
- ORDERER_GENERAL_LOCALMSPID=OrdererMSP
- ORDERER_GENERAL_LOCALMSPDIR=/etc/hyperledger/msp/orderer/msp
working_dir: /opt/gopath/src/github.com/hyperledger/fabric/orderer
command: orderer
ports:
- 7050:7050
volumes:
- ./config/:/etc/hyperledger/configtx
- ./crypto-config/ordererOrganizations/example.com/orderers/orderer.example.com/:/etc/hyperledger/msp/orderer
- ./crypto-config/peerOrganizations/org1.example.com/peers/peer0.org1.example.com/:/etc/hyperledger/msp/peerOrg1
networks:
- basic
peer0.org1.example.com:
container_name: peer0.org1.example.com
image: hyperledger/fabric-peer
environment:
- CORE_VM_ENDPOINT=unix:///host/var/run/docker.sock
- CORE_PEER_ID=peer0.org1.example.com
- CORE_LOGGING_PEER=debug
- CORE_CHAINCODE_LOGGING_LEVEL=DEBUG
- CORE_PEER_LOCALMSPID=Org1MSP
- CORE_PEER_MSPCONFIGPATH=/etc/hyperledger/msp/peer/
- CORE_PEER_ADDRESS=peer0.org1.example.com:7051
# # the following setting starts chaincode containers on the same
# # bridge network as the peers
# # https://docs.docker.com/compose/networking/
- CORE_VM_DOCKER_HOSTCONFIG_NETWORKMODE=${
COMPOSE_PROJECT_NAME}_basic
- CORE_LEDGER_STATE_STATEDATABASE=CouchDB
- CORE_LEDGER_STATE_COUCHDBCONFIG_COUCHDBADDRESS=couchdb:5984
# The CORE_LEDGER_STATE_COUCHDBCONFIG_USERNAME and CORE_LEDGER_STATE_COUCHDBCONFIG_PASSWORD
# provide the credentials for ledger to connect to CouchDB. The username and password must
# match the username and password set for the associated CouchDB.
- CORE_LEDGER_STATE_COUCHDBCONFIG_USERNAME=
- CORE_LEDGER_STATE_COUCHDBCONFIG_PASSWORD=
working_dir: /opt/gopath/src/github.com/hyperledger/fabric
command: peer node start
# command: peer node start --peer-chaincodedev=true
ports:
- 7051:7051
- 7053:7053
volumes:
- /var/run/:/host/var/run/
- ./crypto-config/peerOrganizations/org1.example.com/peers/peer0.org1.example.com/msp:/etc/hyperledger/msp/peer
- ./crypto-config/peerOrganizations/org1.example.com/users:/etc/hyperledger/msp/users
- ./config:/etc/hyperledger/configtx
depends_on:
- orderer.example.com
- couchdb
networks:
- basic
couchdb:
container_name: couchdb
image: hyperledger/fabric-couchdb
# Populate the COUCHDB_USER and COUCHDB_PASSWORD to set an admin user and password
# for CouchDB. This will prevent CouchDB from operating in an "Admin Party" mode.
environment:
- COUCHDB_USER=
- COUCHDB_PASSWORD=
ports:
- 5984:5984
networks:
- basic
cli:
container_name: cli
image: hyperledger/fabric-tools
tty: true
environment:
- GOPATH=/opt/gopath
- CORE_VM_ENDPOINT=unix:///host/var/run/docker.sock
- CORE_LOGGING_LEVEL=DEBUG
- CORE_PEER_ID=cli
- CORE_PEER_ADDRESS=peer0.org1.example.com:7051
- CORE_PEER_LOCALMSPID=Org1MSP
- CORE_PEER_MSPCONFIGPATH=/opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/peerOrganizations/org1.example.com/users/Admin@org1.example.com/msp
- CORE_CHAINCODE_KEEPALIVE=10
working_dir: /opt/gopath/src/github.com/hyperledger/fabric/peer
command: /bin/bash
volumes:
- /var/run/:/host/var/run/
- ./../chaincode/:/opt/gopath/src/github.com/
- ./crypto-config:/opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/
networks:
- basic
#depends_on:
# - orderer.example.com
# - peer0.org1.example.com
# - couchdb
startFabric.sh安装链码的shell指令（链码路径位于/opt/gopath/src/github.com/中）
注意当每次链码升级的时候，更改链码版本号再进行重装
docker exec -e "CORE_PEER_LOCALMSPID=Org1MSP" -e "CORE_PEER_MSPCONFIGPATH=/opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/peerOrganizations/org1.example.com/users/[email protected]/msp" cli peer chaincode install -n trail -v 1.0 -p github.com/trail
docker exec -e "CORE_PEER_LOCALMSPID=Org1MSP" -e "CORE_PEER_MSPCONFIGPATH=/opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/peerOrganizations/org1.example.com/users/[email protected]/msp" cli peer chaincode instantiate -o orderer.example.com:7050 -C mychannel -n trail -v 1.0 -c '{"Args":[""]}' -P "OR ('Org1MSP.member','Org2MSP.member')"
完成链码编辑和安装之后，我们便可开始node调用代码编写