上个版本的chaincode有很多功能不完备，所以要部署新版本的chaincode。Fabric支持在保留现有状态的前提对chaincode进行升级。
一.新版chaincode
新版本的chaincode增加的功能如下：
1.增加了数据追溯功能，在社区用户发起transaction时，chaincode将自动在用户证书中提取用户信息，将其存储在帖子的字段里。
2.加入了敏感词监管功能，敏感词字典和敏感词过滤功能在外部提供，chaincode通过http api（post 请求）调用服务。
3.加入了模糊查询功能。
chaincode代码：
package main
import (
"bytes"
"encoding/json"
"fmt"
"strconv"
"strings"
"net/http"
"io/ioutil"
"crypto/x509"
"encoding/pem"
"github.com/hyperledger/fabric/core/chaincode/shim"
sc "github.com/hyperledger/fabric/protos/peer"
)
type SmartContract struct {
}
type Post struct {
Id string `json:"id"`
OriginalWebsite string `json:"originalwebsite"`
OriginalID string `json:"originalid"`
Title string `json:"title"`
Content string `json:"content"`
AuthorId string `json:"authorid"`
PublishTime string `json:"publishtime"`
UpdateTime string `json:"updatetime"`
Category string `json:"category"`
SourceId string `json:"sourceid"`
Labels string `json:"labels"`
Follower_num int `json:"follower_num"`
Browse_num int `json:"browse_num"`
Star_num int `json:"star_num"`
UserName string `json:"username"`
}
type PostLength struct {
Length int `json:"length"`
}
func (s *SmartContract) Init(APIstub shim.ChaincodeStubInterface) sc.Response {
return shim.Success(nil)
}
func (s *SmartContract) Invoke(APIstub shim.ChaincodeStubInterface) sc.Response {
function, args := APIstub.GetFunctionAndParameters()
if function == "queryPost" {
return s.queryPost(APIstub, args)
} else if function == "initLedger" {
return s.initLedger(APIstub)
} else if function == "addPost" {
return s.addPost(APIstub, args)
} else if function == "updatePost" {
return s.updatePost(APIstub, args)
} else if function == "richQueryPosts" {
return s.richQueryPosts(APIstub, args)
} else if function == "getPostNum" {
return s.getPostNum(APIstub, args)
}
return shim.Error("Invalid Smart Contract function name.")
}
func (s *SmartContract) queryPost(APIstub shim.ChaincodeStubInterface, args []string) sc.Response {
if len(args) != 1 {
return shim.Error("Incorrect number of arguments. Expecting 1")
}
postAsBytes, _ := APIstub.GetState(args[0])
return shim.Success(postAsBytes)
}
func (s *SmartContract) initLedger(APIstub shim.ChaincodeStubInterface) sc.Response {
creatorByte,_:= APIstub.GetCreator()
certStart := bytes.IndexAny(creatorByte, "-----BEGIN")
if certStart == -1 {
fmt.Errorf("No certificate found")
}
certText := creatorByte[certStart:]
bl, _ := pem.Decode(certText)
if bl == nil {
fmt.Errorf("Could not decode the PEM structure")
}
cert, err := x509.ParseCertificate(bl.Bytes)
if err != nil {
fmt.Errorf("ParseCertificate failed")
}
uname:=cert.Subject.CommonName
posts := []Post{
Post{Id: "1", OriginalWebsite: "b", OriginalID: "c", Title: "如何学习人工智能呢？",Content:"好好学习",AuthorId:"f",PublishTime:"g",UpdateTime:"h",Category:"i",SourceId:"j",Labels:"k",Follower_num:100,Browse_num:200,Star_num:300,UserName:uname},
Post{Id: "2", OriginalWebsite: "bb", OriginalID: "bb", Title: "目前大数据有什么用呢？",Content:"没用",AuthorId:"ff",PublishTime:"gg",UpdateTime:"hh",Category:"ii",SourceId:"jj",Labels:"kk",Follower_num:400,Browse_num:500,Star_num:600,UserName:uname},
}
length := PostLength{Length:len(posts)}
lengthAsBytes,_ := json.Marshal(length)
APIstub.PutState("POSTLENGTH",lengthAsBytes)
i := 0
for i < len(posts) {
fmt.Println("i is ", i)
postAsBytes, _ := json.Marshal(posts[i])
APIstub.PutState("POST"+strconv.Itoa(i), postAsBytes)
fmt.Println("Added", posts[i])
i = i + 1
}
return shim.Success(nil)
}
func (s *SmartContract) addPost(APIstub shim.ChaincodeStubInterface, args []string) sc.Response {
if len(args) != 13 {
return shim.Error("Incorrect number of arguments. Expecting 13")
}
filteredtitle := sensitiveSupervision(args[2])
filteredcontent := sensitiveSupervision(args[3])
creatorByte,_:= APIstub.GetCreator()
certStart := bytes.IndexAny(creatorByte, "-----BEGIN")
if certStart == -1 {
fmt.Errorf("No certificate found")
}
certText := creatorByte[certStart:]
bl, _ := pem.Decode(certText)
if bl == nil {
fmt.Errorf("Could not decode the PEM structure")
}
cert, err := x509.ParseCertificate(bl.Bytes)
if err != nil {
fmt.Errorf("ParseCertificate failed")
}
uname:=cert.Subject.CommonName
args10,error := strconv.Atoi(args[10])
args11,error := strconv.Atoi(args[11])
args12,error := strconv.Atoi(args[12])
if error != nil{
fmt.Println("String conversion integer failed!")
}
lengthAsBytes, _ := APIstub.GetState("POSTLENGTH")
length := PostLength{}
json.Unmarshal(lengthAsBytes,&length)
newlength := length.Length+1
var post = Post{Id: strconv.Itoa(newlength), OriginalWebsite: args[0], OriginalID: args[1], Title: filteredtitle,Content:filteredcontent,AuthorId:args[4],PublishTime:args[5],UpdateTime:args[6],Category:args[7],SourceId:args[8],Labels:args[9],Follower_num:args10,Browse_num:args11,Star_num:args12,UserName:uname}
postAsBytes, _ := json.Marshal(post)
APIstub.PutState("POST"+strconv.Itoa(newlength), postAsBytes)
length.Length = newlength
lengthAsBytes,_ = json.Marshal(length)
APIstub.PutState("POSTLENGTH",lengthAsBytes)
return shim.Success(lengthAsBytes)
}
func (s *SmartContract) updatePost(APIstub shim.ChaincodeStubInterface, args []string) sc.Response {
if len(args) != 14 {
return shim.Error("Incorrect number of arguments. Expecting 14")
}
filteredtitle := sensitiveSupervision(args[3])
filteredcontent := sensitiveSupervision(args[4])
creatorByte,_:= APIstub.GetCreator()
certStart := bytes.IndexAny(creatorByte, "-----BEGIN")
if certStart == -1 {
fmt.Errorf("No certificate found")
}
certText := creatorByte[certStart:]
bl, _ := pem.Decode(certText)
if bl == nil {
fmt.Errorf("Could not decode the PEM structure")
}
cert, err := x509.ParseCertificate(bl.Bytes)
if err != nil {
fmt.Errorf("ParseCertificate failed")
}
uname:=cert.Subject.CommonName
args11,error := strconv.Atoi(args[11])
args12,error := strconv.Atoi(args[12])
args13,error := strconv.Atoi(args[13])
if error != nil{
fmt.Println("String conversion integer failed!")
}
var post = Post{Id: args[0], OriginalWebsite: args[1], OriginalID: args[2], Title: filteredtitle,Content:filteredcontent,AuthorId:args[5],PublishTime:args[6],UpdateTime:args[7],Category:args[8],SourceId:args[9],Labels:args[10],Follower_num:args11,Browse_num:args12,Star_num:args13,UserName:uname}
postAsBytes, _ := json.Marshal(post)
APIstub.PutState("POST"+args[0], postAsBytes)
return shim.Success(nil)
}
func (s *SmartContract) richQueryPosts(APIstub shim.ChaincodeStubInterface, args []string) sc.Response {
if len(args) != 3 {
return shim.Error("Incorrect number of arguments. Expecting 3")
}
var queryString string
if args[1] == "0" {
queryString = fmt.Sprintf("{"selector":{"%s":"%s"}}", args[0],args[2])
} else if args[1] == "1" {
queryString = fmt.Sprintf("{"selector":{"%s":{"$gt":%s}}}", args[0],args[2])
} else if args[1] == "2" {
queryString = fmt.Sprintf("{"selector":{"%s":{"$gte":%s}}}", args[0],args[2])
} else if args[1] == "3" {
queryString = fmt.Sprintf("{"selector":{"%s":{"$lt":%s}}}", args[0],args[2])
} else if args[1] == "4" {
queryString = fmt.Sprintf("{"selector":{"%s":{"$lte":%s}}}", args[0],args[2])
} else if args[1] == "5" {
between := strings.Split(args[2], ",")
queryString = fmt.Sprintf("{"selector":{"$and":[{"%s":{"$gte":%s}},{"%s":{"$lte":%s}}]}}", args[0],between[0],args[0],between[1])
} else if args[1] == "6" {
queryString = fmt.Sprintf("{"selector":{"%s":{"$regex":"(?i)%s"}}}", args[0],args[2])
} else {
return shim.Error("Incorrect number of arguments. Expecting 0~6")
}
resultsIterator, err := APIstub.GetQueryResult(queryString)
if err != nil {
return shim.Error(err.Error())
}
defer resultsIterator.Close()
var buffer bytes.Buffer
buffer.WriteString("[")
bArrayMemberAlreadyWritten := false
for resultsIterator.HasNext() {
queryResponse, err := resultsIterator.Next()
if err != nil {
return shim.Error(err.Error())
}
if bArrayMemberAlreadyWritten == true {
buffer.WriteString(",")
}
buffer.WriteString("{"Key":")
buffer.WriteString(""")
buffer.WriteString(queryResponse.Key)
buffer.WriteString(""")
buffer.WriteString(", "Record":")
buffer.WriteString(string(queryResponse.Value))
buffer.WriteString("}")
bArrayMemberAlreadyWritten = true
}
buffer.WriteString("]")
fmt.Printf("- richQueryPosts:
%s
", buffer.String())
return shim.Success(buffer.Bytes())
}
func (s *SmartContract) getPostNum(APIstub shim.ChaincodeStubInterface, args []string) sc.Response {
if len(args) != 3 {
return shim.Error("Incorrect number of arguments. Expecting 3")
}
var queryString string
if args[1] == "0" {
queryString = fmt.Sprintf("{"selector":{"%s":"%s"}}", args[0],args[2])
} else if args[1] == "1" {
queryString = fmt.Sprintf("{"selector":{"%s":{"$gt":%s}}}", args[0],args[2])
} else if args[1] == "2" {
queryString = fmt.Sprintf("{"selector":{"%s":{"$gte":%s}}}", args[0],args[2])
} else if args[1] == "3" {
queryString = fmt.Sprintf("{"selector":{"%s":{"$lt":%s}}}", args[0],args[2])
} else if args[1] == "4" {
queryString = fmt.Sprintf("{"selector":{"%s":{"$lte":%s}}}", args[0],args[2])
} else if args[1] == "5" {
between := strings.Split(args[2], ",")
queryString = fmt.Sprintf("{"selector":{"$and":[{"%s":{"$gte":%s}},{"%s":{"$lte":%s}}]}}", args[0],between[0],args[0],between[1])
} else if args[1] == "6" {
queryString = fmt.Sprintf("{"selector":{"%s":{"$regex":"(?i)%s"}}}", args[0],args[2])
} else {
return shim.Error("Incorrect number of arguments. Expecting 0~6")
}
resultsIterator, err := APIstub.GetQueryResult(queryString)
if err != nil {
return shim.Error(err.Error())
}
defer resultsIterator.Close()
i := 0
for resultsIterator.HasNext() {
resultsIterator.Next()
i = i + 1
}
fmt.Printf("- getPostNum:
%s
", strconv.Itoa(i))
return shim.Success([]byte(strconv.Itoa(i)))
}
func sensitiveSupervision(arg string) string {
quertString := fmt.Sprintf("{"content":"%s"}",arg)
resp, err := http.Post("http://敏感监管url",
"application/x-www-form-urlencoded",
strings.NewReader(quertString))
if err != nil {
fmt.Println(err)
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
}
return string(body)
}
func main() {
err := shim.Start(new(SmartContract))
if err != nil {
fmt.Printf("Error creating new Smart Contract: %s", err)
}
}
二.升级链码步骤
2.1 从宿主机将chaincode拷贝进容器
docker cp community2.0 cli:/opt/gopath/src/github.com/hyperledger/fabric/examples/chaincode/go
2.2 安装新版本chaincode，打包到peer节点
docker exec -it cli bash
peer chaincode install -n mycc -v 2.0 -p github.com/hyperledger/fabric/examples/chaincode/go/community2.0
2.3 升级chaincode
peer chaincode upgrade -o orderer.example.com:7050 --tls true --cafile /opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/ordererOrganizations/example.com/orderers/orderer.example.com/msp/tlscacerts/tlsca.example.com-cert.pem -C mychannel -n mycc -v 2.0 -c '{"Args":["init"]}' -P "OR ('Org1MSP.member','Org2MSP.member')"
这样chaincode就升级完毕了。