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/*
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.
*/
package main
import (
"errors"
"fmt"
"strconv"
"encoding/json"
"time"
"github.com/hyperledger/fabric/core/chaincode/shim"
)
// Test comment
// SimpleChaincode example simple Chaincode implementation
type SimpleChaincode struct {
}
// Maximum number of transactions to return
const NUM_TX_TO_RETURN = 27
// Smart Contract Id numbers
const DOUBLE_CONTRACT = "C289416"
const FEEDBACK_CONTRACT = "C791594"
// Blockchain point transaction record
type Transaction struct {
RefNumber string `json:"RefNumber"`
Date time.Time `json:"Date"`
Description string `json:"description"`
Type string `json:"Type"`
Amount float64 `json:"Amount"`
Money float64 `json:"Money"`
Activities int `json:"FeedbackActivitiesDone"`
To string `json:"ToUserid"`
From string `json:"FromUserid"`
ToName string `json:"ToName"`
FromName string `json:"FromName"`
ContractId string `json:"ContractId"`
StatusCode int `json:"StatusCode"`
StatusMsg string `json:"StatusMsg"`
}
// Smart contract metadata record
type Contract struct {
Id string `json:"ID"`
BusinessId string `json:"BusinessId"`
BusinessName string `json:"BusinessName"`
Title string `json:"Title"`
Description string `json:"Description"`
Conditions []string `json:"Conditions"`
Icon string `json:"Icon"`
StartDate time.Time `json:"StartDate"`
EndDate time.Time `json:"EndDate"`
Method string `json:"Method"`
}
// Open Points member record
type User struct {
UserId string `json:"UserId"`
Name string `json:"Name"`
Balance float64 `json:"Balance"`
NumTxs int `json:"NumberOfTransactions"`
Status string `json:"Status"`
Expiration string `json:"ExpirationDate"`
Join string `json:"JoinDate"`
Modified string `json:"LastModifiedDate"`
}
// Array for storing all open points transactions
type AllTransactions struct{
Transactions []Transaction `json:"transactions"`
}
// ============================================================================================================================
// Main
// ============================================================================================================================
func main() {
err := shim.Start(new(SimpleChaincode))
if err != nil {
fmt.Printf("Error starting Simple chaincode: %s", err)
}
}
// ============================================================================================================================
// Init - reset all the things
// ============================================================================================================================
func (t *SimpleChaincode) Init(stub shim.ChaincodeStubInterface, function string, args []string) ([]byte, error) {
var err error
if len(args) != 1 {
return nil, errors.New("Incorrect number of arguments. Expecting 1")
}
// Create the 'Bank' user and add it to the blockchain
var bank User
bank.UserId = "B1928564";
bank.Name = "OpenFN"
bank.Balance = 1000000
bank.Status = "Originator"
bank.Expiration = "2099-12-31"
bank.Join = "2015-01-01"
bank.Modified = "2016-05-06"
bank.NumTxs = 0
jsonAsBytes, _ := json.Marshal(bank)
err = stub.PutState(bank.UserId, jsonAsBytes)
if err != nil {
fmt.Println("Error Creating Bank user account")
return nil, err
}
// Create the 'Travel Agency' user and add it to the blockchain
var travel User
travel.UserId = "T5940872";
travel.Name = "Open Travel"
travel.Balance = 500000
travel.Status = "Member"
travel.Expiration = "2099-12-31"
travel.Join = "2015-01-01"
travel.Modified = "2016-05-06"
travel.NumTxs = 0
jsonAsBytes, _ = json.Marshal(travel)
err = stub.PutState(travel.UserId, jsonAsBytes)
if err != nil {
fmt.Println("Error Creating Travel user account")
return nil, err
}
// Create the 'Natalie' user and add her to the blockchain
var natalie User
natalie.UserId = "U2974034";
natalie.Name = "Natalie"
natalie.Balance = 1000
natalie.Status = "Platinum"
natalie.Expiration = "2017-06-01"
natalie.Join = "2015-05-31"
natalie.Modified = "2016-05-06"
natalie.NumTxs = 0
jsonAsBytes, _ = json.Marshal(natalie)
err = stub.PutState(natalie.UserId, jsonAsBytes)
if err != nil {
fmt.Println("Error Creating Natalie user account")
return nil, err
}
// Create the 'Anthony' user and add him to the blockchain
var anthony User
anthony.UserId = "U3151672";
anthony.Name = "Anthony"
anthony.Balance = 500
anthony.Status = "Silver"
anthony.Expiration = "2017-03-15"
anthony.Join = "2015-08-15"
anthony.Modified = "2016-04-17"
anthony.NumTxs = 0
jsonAsBytes, _ = json.Marshal(anthony)
err = stub.PutState(anthony.UserId, jsonAsBytes)
if err != nil {
fmt.Println("Error Creating Anthony user account")
return nil, err
}
// Create an array for storing all transactions, and store the array on the blockchain
var transactions AllTransactions
jsonAsBytes, _ = json.Marshal(transactions)
err = stub.PutState("allTx", jsonAsBytes)
if err != nil {
return nil, err
}
// Create transaction reference number and store it on the blockchain
var refNumber int
refNumber = 2985674978
jsonAsBytes, _ = json.Marshal(refNumber)
err = stub.PutState("refNumber", jsonAsBytes)
if err != nil {
fmt.Println("Error Creating reference number")
return nil, err
}
// Create contract metadata for double points and add it to the blockchain
var double Contract
double.Id = DOUBLE_CONTRACT
double.BusinessId = "B1928564"
double.BusinessName = "OpenFN"
double.Title = "Double Points using OpenFN OpenPay"
double.Description = "Earn double points on dining and selected travel activities using OpenFN OpenPay"
double.Conditions = append(double.Conditions, "2x points for dinning and travel activities")
double.Conditions = append(double.Conditions, "Valid from May 11, 2016")
double.Icon = ""
double.Method = "doubleContract"
startDate, _ := time.Parse(time.RFC822, "11 May 16 12:00 UTC")
double.StartDate = startDate
endDate, _ := time.Parse(time.RFC822, "31 Dec 60 11:59 UTC")
double.EndDate = endDate
jsonAsBytes, _ = json.Marshal(double)
err = stub.PutState(DOUBLE_CONTRACT, jsonAsBytes)
if err != nil {
fmt.Println("Error creating double contract")
return nil, err
}
// Create contract metadata for feedback points and add it to the blockchain
var feedback Contract
feedback.Id = FEEDBACK_CONTRACT
feedback.BusinessId = "T5940872"
feedback.BusinessName = "Open Travel"
feedback.Title = "Points for Feedback by Open Travel"
feedback.Description = "Earn points by sharing your thoughts on travel package and activities"
feedback.Conditions = append(feedback.Conditions, "1,000 points for travel package ")
feedback.Conditions = append(feedback.Conditions, "100 points for each travel activity")
feedback.Conditions = append(feedback.Conditions, "Valid from May 24, 2016")
feedback.Icon = ""
feedback.Method = "feedbackContract"
startDate, _ = time.Parse(time.RFC822, "24 May 16 12:00 UTC")
feedback.StartDate = startDate
endDate, _ = time.Parse(time.RFC822, "31 Dec 60 11:59 UTC")
feedback.EndDate = endDate
jsonAsBytes, _ = json.Marshal(feedback)
err = stub.PutState(FEEDBACK_CONTRACT, jsonAsBytes)
if err != nil {
fmt.Println("Error creating feedback contract")
return nil, err
}
// Create an array of contract ids to keep track of all contracts
var contractIds []string
contractIds = append(contractIds, DOUBLE_CONTRACT);
contractIds = append(contractIds, FEEDBACK_CONTRACT);
jsonAsBytes, _ = json.Marshal(contractIds)
err = stub.PutState("contractIds", jsonAsBytes)
if err != nil {
fmt.Println("Error storing contract Ids on blockchain")
return nil, err
}
return nil, nil
}
// ============================================================================================================================
// Run - Our entry point for Invocations - [LEGACY] obc-peer 4/25/2016
// ============================================================================================================================
func (t *SimpleChaincode) Run(stub shim.ChaincodeStubInterface, function string, args []string) ([]byte, error) {
fmt.Println("run is running " + function)
return t.Invoke(stub, function, args)
}
// ============================================================================================================================
// Invoke - Our entry point for Invocations
// ============================================================================================================================
func (t *SimpleChaincode) Invoke(stub shim.ChaincodeStubInterface, function string, args []string) ([]byte, error) {
fmt.Println("invoke is running " + function)
// Handle different functions
if function == "init" { //initialize the chaincode state, used as reset
return t.Init(stub, "init", args)
} else if function == "transferPoints" { //create a transaction
return t.transferPoints(stub, args)
}
fmt.Println("invoke did not find func: " + function) //error
return nil, errors.New("Received unknown function invocation")
}
// ============================================================================================================================
// Query - Our entry point for Queries
// ============================================================================================================================
func (t *SimpleChaincode) Query(stub shim.ChaincodeStubInterface, function string, args []string) ([]byte, error) {
fmt.Println("query is running " + function)
if function == "getTxs" { return t.getTxs(stub, args[1]) }
if function == "getUserAccount" { return t.getUserAccount(stub, args[1]) }
if function == "getAllContracts" { return t.getAllContracts(stub) }
fmt.Println("query did not find func: " + function) //error
return nil, errors.New("Received unknown function query")
}
// ============================================================================================================================
// Get Open Points member account from the blockchain
// ============================================================================================================================
func (t *SimpleChaincode) getUserAccount(stub shim.ChaincodeStubInterface, userId string)([]byte, error){
fmt.Println("Start getUserAccount")
fmt.Println("Looking for user with ID " + userId);
//get the User index
fdAsBytes, err := stub.GetState(userId)
if err != nil {
return nil, errors.New("Failed to get user account from blockchain")
}
return fdAsBytes, nil
}
// ============================================================================================================================
// Get all transactions that involve a particular user
// ============================================================================================================================
func (t *SimpleChaincode) getTxs(stub shim.ChaincodeStubInterface, userId string)([]byte, error){
var res AllTransactions
fmt.Println("Start find getTransactions")
fmt.Println("Looking for " + userId);
//get the AllTransactions index
allTxAsBytes, err := stub.GetState("allTx")
if err != nil {
return nil, errors.New("Failed to get all Transactions")
}
var txs AllTransactions
json.Unmarshal(allTxAsBytes, &txs)
numTxs := len(txs.Transactions)
for i := numTxs -1; i >= 0; i-- {
if txs.Transactions[i].From == userId{
res.Transactions = append(res.Transactions, txs.Transactions[i])
}
if txs.Transactions[i].To == userId{
res.Transactions = append(res.Transactions, txs.Transactions[i])
}
if (len(res.Transactions) >= NUM_TX_TO_RETURN) { break }
}
resAsBytes, _ := json.Marshal(res)
return resAsBytes, nil
}
// ============================================================================================================================
// Get the smart contract metadata from the blockchain
// ============================================================================================================================
func (t *SimpleChaincode) getAllContracts(stub shim.ChaincodeStubInterface)([]byte, error) {
contractIdsAsBytes, _ := stub.GetState("contractIds")
var contractIds []string
json.Unmarshal(contractIdsAsBytes, &contractIds)
var allContracts []Contract
for i := range contractIds{
contractAsBytes, _ := stub.GetState(contractIds[i])
var thisContract Contract
json.Unmarshal(contractAsBytes, &thisContract)
allContracts = append(allContracts, thisContract)
}
asBytes, _ := json.Marshal(allContracts)
return asBytes, nil
}
// ============================================================================================================================
// Smart contract for giving user double points
// ============================================================================================================================
func doubleContract(tx Transaction, stub shim.ChaincodeStubInterface) float64 {
contractAsBytes, err := stub.GetState(DOUBLE_CONTRACT)
if err != nil {
return -99
}
var contract Contract
json.Unmarshal(contractAsBytes, &contract)
var pointsToTransfer float64
pointsToTransfer = tx.Amount
if (tx.Date.After(contract.StartDate) && tx.Date.Before(contract.EndDate)) {
pointsToTransfer = pointsToTransfer * 2
}
return pointsToTransfer
}
// ============================================================================================================================
// Smart contract for giving user points for completing feedback surveys
// ============================================================================================================================
func feedbackContract(tx Transaction, stub shim.ChaincodeStubInterface) float64 {
contractAsBytes, err := stub.GetState(FEEDBACK_CONTRACT)
if err != nil {
return -99
}
var contract Contract
json.Unmarshal(contractAsBytes, &contract)
var pointsToTransfer float64
pointsToTransfer = 0
if (tx.Date.After(contract.StartDate) && tx.Date.Before(contract.EndDate)) {
pointsToTransfer = 1000
if (tx.Activities > 0) {
pointsToTransfer = pointsToTransfer + float64(tx.Activities)*100
}
}
return pointsToTransfer
}
// ============================================================================================================================
// Transfer points between members of the Open Points Network
// ============================================================================================================================
func (t *SimpleChaincode) transferPoints(stub shim.ChaincodeStubInterface, args []string) ([]byte, error) {
fmt.Println("Running transferPoints")
currentDateStr := time.Now().Format(time.RFC822)
startDate, _ := time.Parse(time.RFC822, currentDateStr)
var tx Transaction
tx.Date = startDate
tx.To = args[0]
tx.From = args[1]
tx.Type = args[2]
tx.Description = args[3]
tx.ContractId = args[4]
activities, _ := strconv.Atoi(args[5])
tx.Activities = activities
tx.StatusCode = 1
tx.StatusMsg = "Transaction Completed"
amountValue, err := strconv.ParseFloat(args[6], 64)
if err != nil {
tx.StatusCode = 0
tx.StatusMsg = "Invalid Amount"
}else{
tx.Amount = amountValue
}
moneyValue, err := strconv.ParseFloat(args[7], 64)
if err != nil {
tx.StatusCode = 0
tx.StatusMsg = "Invalid Amount"
}else{
tx.Money = moneyValue
}
// Get the current reference number and update it
var refNumber int
refNumberBytes, numErr := stub.GetState("refNumber")
if numErr != nil {
fmt.Println("Error Getting ref number for transferring points")
return nil, err
}
json.Unmarshal(refNumberBytes, &refNumber)
tx.RefNumber = strconv.Itoa(refNumber)
refNumber = refNumber + 1;
refNumberBytes, _ = json.Marshal(refNumber)
err = stub.PutState("refNumber", refNumberBytes)
if err != nil {
fmt.Println("Error Creating updating ref number")
return nil, err
}
// Determine point amount to transfer based on contract type
if (tx.ContractId == DOUBLE_CONTRACT) {
tx.Amount = doubleContract(tx, stub)
} else if (tx.ContractId == FEEDBACK_CONTRACT) {
tx.Amount = feedbackContract(tx, stub)
}
// Get Receiver account from BC and update point balance
rfidBytes, err := stub.GetState(tx.To)
if err != nil {
return nil, errors.New("transferPoints Failed to get Receiver from BC")
}
var receiver User
fmt.Println("transferPoints Unmarshalling User Struct");
err = json.Unmarshal(rfidBytes, &receiver)
receiver.Balance = receiver.Balance + tx.Amount
receiver.Modified = currentDateStr
receiver.NumTxs = receiver.NumTxs + 1
tx.ToName = receiver.Name;
//Commit Receiver to ledger
fmt.Println("transferPoints Commit Updated receiver To Ledger");
txsAsBytes, _ := json.Marshal(receiver)
err = stub.PutState(tx.To, txsAsBytes)
if err != nil {
return nil, err
}
// Get Sender account from BC nd update point balance
rfidBytes, err = stub.GetState(tx.From)
if err != nil {
return nil, errors.New("transferPoints Failed to get Financial Institution")
}
var sender User
fmt.Println("transferPoints Unmarshalling Sender");
err = json.Unmarshal(rfidBytes, &sender)
sender.Balance = sender.Balance - tx.Amount
sender.Modified = currentDateStr
sender.NumTxs = sender.NumTxs + 1
tx.FromName = sender.Name;
//Commit Sender to ledger
fmt.Println("transferPoints Commit Updated Sender To Ledger");
txsAsBytes, _ = json.Marshal(sender)
err = stub.PutState(tx.From, txsAsBytes)
if err != nil {
return nil, err
}
//get the AllTransactions index
allTxAsBytes, err := stub.GetState("allTx")
if err != nil {
return nil, errors.New("transferPoints: Failed to get all Transactions")
}
//Update transactions arrary and commit to BC
fmt.Println("SubmitTx Commit Transaction To Ledger");
var txs AllTransactions
json.Unmarshal(allTxAsBytes, &txs)
txs.Transactions = append(txs.Transactions, tx)
txsAsBytes, _ = json.Marshal(txs)
err = stub.PutState("allTx", txsAsBytes)
if err != nil {
return nil, err
}
return nil, nil
}