| 知乎专栏 ｜ 多维度架构 |
[root@localhost netkiller]# cat chaincode/fabcar/fabcar.go
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
/*
* The sample smart contract for documentation topic:
* Writing Your First Blockchain Application
*/
package main
/* Imports
* 4 utility libraries for formatting, handling bytes, reading and writing JSON, and string manipulation
* 2 specific Hyperledger Fabric specific libraries for Smart Contracts
*/
import (
"bytes"
"encoding/json"
"fmt"
"strconv"
"github.com/hyperledger/fabric/core/chaincode/shim"
sc "github.com/hyperledger/fabric/protos/peer"
)
// Define the Smart Contract structure
type SmartContract struct {
}
// Define the car structure, with 4 properties. Structure tags are used by encoding/json library
type Car struct {
Make string `json:"make"`
Model string `json:"model"`
Colour string `json:"colour"`
Owner string `json:"owner"`
}
/*
* The Init method is called when the Smart Contract "fabcar" is instantiated by the blockchain network
* Best practice is to have any Ledger initialization in separate function -- see initLedger()
*/
func (s *SmartContract) Init(APIstub shim.ChaincodeStubInterface) sc.Response {
return shim.Success(nil)
}
/*
* The Invoke method is called as a result of an application request to run the Smart Contract "fabcar"
* The calling application program has also specified the particular smart contract function to be called, with arguments
*/
func (s *SmartContract) Invoke(APIstub shim.ChaincodeStubInterface) sc.Response {
// Retrieve the requested Smart Contract function and arguments
function, args := APIstub.GetFunctionAndParameters()
// Route to the appropriate handler function to interact with the ledger appropriately
if function == "queryCar" {
return s.queryCar(APIstub, args)
} else if function == "initLedger" {
return s.initLedger(APIstub)
} else if function == "createCar" {
return s.createCar(APIstub, args)
} else if function == "queryAllCars" {
return s.queryAllCars(APIstub)
} else if function == "changeCarOwner" {
return s.changeCarOwner(APIstub, args)
}
return shim.Error("Invalid Smart Contract function name.")
}
func (s *SmartContract) queryCar(APIstub shim.ChaincodeStubInterface, args []string) sc.Response {
if len(args) != 1 {
return shim.Error("Incorrect number of arguments. Expecting 1")
}
carAsBytes, _ := APIstub.GetState(args[0])
return shim.Success(carAsBytes)
}
func (s *SmartContract) initLedger(APIstub shim.ChaincodeStubInterface) sc.Response {
cars := []Car{
Car{Make: "Toyota", Model: "Prius", Colour: "blue", Owner: "Tomoko"},
Car{Make: "Ford", Model: "Mustang", Colour: "red", Owner: "Brad"},
Car{Make: "Hyundai", Model: "Tucson", Colour: "green", Owner: "Jin Soo"},
Car{Make: "Volkswagen", Model: "Passat", Colour: "yellow", Owner: "Max"},
Car{Make: "Tesla", Model: "S", Colour: "black", Owner: "Adriana"},
Car{Make: "Peugeot", Model: "205", Colour: "purple", Owner: "Michel"},
Car{Make: "Chery", Model: "S22L", Colour: "white", Owner: "Aarav"},
Car{Make: "Fiat", Model: "Punto", Colour: "violet", Owner: "Pari"},
Car{Make: "Tata", Model: "Nano", Colour: "indigo", Owner: "Valeria"},
Car{Make: "Holden", Model: "Barina", Colour: "brown", Owner: "Shotaro"},
}
i := 0
for i < len(cars) {
fmt.Println("i is ", i)
carAsBytes, _ := json.Marshal(cars[i])
APIstub.PutState("CAR"+strconv.Itoa(i), carAsBytes)
fmt.Println("Added", cars[i])
i = i + 1
}
return shim.Success(nil)
}
func (s *SmartContract) createCar(APIstub shim.ChaincodeStubInterface, args []string) sc.Response {
if len(args) != 5 {
return shim.Error("Incorrect number of arguments. Expecting 5")
}
var car = Car{Make: args[1], Model: args[2], Colour: args[3], Owner: args[4]}
carAsBytes, _ := json.Marshal(car)
APIstub.PutState(args[0], carAsBytes)
return shim.Success(nil)
}
func (s *SmartContract) queryAllCars(APIstub shim.ChaincodeStubInterface) sc.Response {
startKey := "CAR0"
endKey := "CAR999"
resultsIterator, err := APIstub.GetStateByRange(startKey, endKey)
if err != nil {
return shim.Error(err.Error())
}
defer resultsIterator.Close()
// buffer is a JSON array containing QueryResults
var buffer bytes.Buffer
buffer.WriteString("[")
bArrayMemberAlreadyWritten := false
for resultsIterator.HasNext() {
queryResponse, err := resultsIterator.Next()
if err != nil {
return shim.Error(err.Error())
}
// Add a comma before array members, suppress it for the first array member
if bArrayMemberAlreadyWritten == true {
buffer.WriteString(",")
}
buffer.WriteString("{\"Key\":")
buffer.WriteString("\"")
buffer.WriteString(queryResponse.Key)
buffer.WriteString("\"")
buffer.WriteString(", \"Record\":")
// Record is a JSON object, so we write as-is
buffer.WriteString(string(queryResponse.Value))
buffer.WriteString("}")
bArrayMemberAlreadyWritten = true
}
buffer.WriteString("]")
fmt.Printf("- queryAllCars:\n%s\n", buffer.String())
return shim.Success(buffer.Bytes())
}
func (s *SmartContract) changeCarOwner(APIstub shim.ChaincodeStubInterface, args []string) sc.Response {
if len(args) != 2 {
return shim.Error("Incorrect number of arguments. Expecting 2")
}
carAsBytes, _ := APIstub.GetState(args[0])
car := Car{}
json.Unmarshal(carAsBytes, &car)
car.Owner = args[1]
carAsBytes, _ = json.Marshal(car)
APIstub.PutState(args[0], carAsBytes)
return shim.Success(nil)
}
// The main function is only relevant in unit test mode. Only included here for completeness.
func main() {
// Create a new Smart Contract
err := shim.Start(new(SmartContract))
if err != nil {
fmt.Printf("Error creating new Smart Contract: %s", err)
}
}
安装合约在 tools 节点上进行。
docker-compose -f docker-compose-cli.yaml exec cli bash
CORE_PEER_ADDRESS=172.16.0.17:7051
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
peer chaincode install -n fabcar -v 1.0 -p github.com/fabcar
peer chaincode instantiate -o orderer.example.com:7050 -C mychannel -n fabcar -v 1.0 -c '{"Args":[""]}' -P "OR ('Org1MSP.member','Org2MSP.member')"
peer chaincode invoke -o orderer.example.com:7050 -C mychannel -n fabcar -c '{"function":"initLedger","Args":[""]}'
root@a90d0d869dd3:/opt/gopath/src/github.com/hyperledger/fabric/peer# peer chaincode install -n fabcar -v 1.0 -p github.com/fabcar 2018-02-09 11:26:28.025 UTC [msp] GetLocalMSP -> DEBU 001 Returning existing local MSP 2018-02-09 11:26:28.025 UTC [msp] GetDefaultSigningIdentity -> DEBU 002 Obtaining default signing identity 2018-02-09 11:26:28.025 UTC [chaincodeCmd] checkChaincodeCmdParams -> INFO 003 Using default escc 2018-02-09 11:26:28.025 UTC [chaincodeCmd] checkChaincodeCmdParams -> INFO 004 Using default vscc 2018-02-09 11:26:28.139 UTC [golang-platform] getCodeFromFS -> DEBU 005 getCodeFromFS github.com/fabcar 2018-02-09 11:26:29.394 UTC [golang-platform] func1 -> DEBU 006 Discarding GOROOT package bytes 2018-02-09 11:26:29.395 UTC [golang-platform] func1 -> DEBU 007 Discarding GOROOT package encoding/json 2018-02-09 11:26:29.395 UTC [golang-platform] func1 -> DEBU 008 Discarding GOROOT package fmt 2018-02-09 11:26:29.395 UTC [golang-platform] func1 -> DEBU 009 Discarding provided package github.com/hyperledger/fabric/core/chaincode/shim 2018-02-09 11:26:29.395 UTC [golang-platform] func1 -> DEBU 00a Discarding provided package github.com/hyperledger/fabric/protos/peer 2018-02-09 11:26:29.395 UTC [golang-platform] func1 -> DEBU 00b Discarding GOROOT package strconv 2018-02-09 11:26:29.396 UTC [golang-platform] GetDeploymentPayload -> DEBU 00c done 2018-02-09 11:26:29.406 UTC [msp/identity] Sign -> DEBU 00d Sign: plaintext: 0A8A070A5C08031A0C08E58AF6D30510...939FFF060000FFFF9C08DC0700200000 2018-02-09 11:26:29.406 UTC [msp/identity] Sign -> DEBU 00e Sign: digest: A504EE8048EEE8C77F9E1C39827124474638110FD3980017BCA6D644E3E7EC98 2018-02-09 11:26:29.426 UTC [chaincodeCmd] install -> DEBU 00f Installed remotely response:<status:200 payload:"OK" > 2018-02-09 11:26:29.427 UTC [main] main -> INFO 010 Exiting.....
peer chaincode instantiate -o 172.16.0.17:7050 -C mychannel -n fabcar -v 1.0 -c '{"Args":[""]}' -P "OR ('Org1MSP.member','Org2MSP.member')"