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switch.go
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switch.go
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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"
"github.com/hyperledger/fabric-chaincode-go/shim"
"strconv"
sc "github.com/hyperledger/fabric-protos-go/peer"
)
type SmartContract struct {
}
type Account struct {
AccountName string `json:"account_name"`
AccountNumber string `json:"account_number"`
AccountBalance float64 `json:"account_balance"`
}
// Init method is called when the Smart Contract "switch" 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)
}
// Invoke method is called as a result of an application request to run the Smart Contract "switch"
// 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 == "queryAccount" {
return s.queryAccount(APIstub, args)
} else if function == "initLedger" {
return s.initLedger(APIstub)
} else if function == "createAccount" {
return s.createAccount(APIstub, args)
} else if function == "queryAllAccounts" {
return s.queryAllAccounts(APIstub)
} else if function == "changeAccountName" {
return s.changeAccountName(APIstub, args)
} else if function == "depositFunds" {
return s.depositFunds(APIstub, args)
} else if function == "withdrawFunds" {
return s.withdrawFunds(APIstub, args)
}
return shim.Error("Invalid Smart Contract function name.")
}
func (s *SmartContract) queryAccount(APIstub shim.ChaincodeStubInterface, args []string) sc.Response {
if len(args) != 1 {
return shim.Error("Incorrect number of arguments. Expecting 1")
}
accountAsBytes, _ := APIstub.GetState(args[0])
return shim.Success(accountAsBytes)
}
func (s *SmartContract) initLedger(APIstub shim.ChaincodeStubInterface) sc.Response {
accounts := []Account{
Account{AccountName: "Elizabeth Adegbaju", AccountNumber: "2174935757", AccountBalance: 50000.00},
Account{AccountName: "Adeotun Adegbaju", AccountNumber: "0461049979", AccountBalance: 70000.00},
}
i := 0
for i < len(accounts) {
fmt.Println("i is ", i)
accountAsBytes, _ := json.Marshal(accounts[i])
err := APIstub.PutState("ACC"+strconv.Itoa(i), accountAsBytes)
if err != nil {
return shim.Error(err.Error())
}
fmt.Println("Added", accounts[i])
i = i + 1
}
return shim.Success(nil)
}
func (s *SmartContract) createAccount(APIstub shim.ChaincodeStubInterface, args []string) sc.Response {
if len(args) != 5 {
return shim.Error("Incorrect number of arguments. Expecting 5")
}
accountBalance, _ := strconv.ParseFloat(args[3], 64)
var account = Account{AccountName: args[1], AccountNumber: args[2], AccountBalance: accountBalance}
accountAsBytes, _ := json.Marshal(account)
err := APIstub.PutState(args[0], accountAsBytes)
if err != nil {
return shim.Error(err.Error())
}
return shim.Success(nil)
}
func (s *SmartContract) queryAllAccounts(APIstub shim.ChaincodeStubInterface) sc.Response {
startKey := "ACC0"
endKey := "ACC999"
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("- queryAllAccounts:\n%s\n", buffer.String())
return shim.Success(buffer.Bytes())
}
func (s *SmartContract) changeAccountName(APIstub shim.ChaincodeStubInterface, args []string) sc.Response {
if len(args) != 2 {
return shim.Error("Incorrect number of arguments. Expecting 2")
}
accountAsBytes, _ := APIstub.GetState(args[0])
account := Account{}
err := json.Unmarshal(accountAsBytes, &account)
if err != nil {
return shim.Error(err.Error())
}
account.AccountName = args[1]
accountAsBytes, _ = json.Marshal(account)
err = APIstub.PutState(args[0], accountAsBytes)
if err != nil {
return shim.Error(err.Error())
}
return shim.Success(nil)
}
func (s *SmartContract) depositFunds(APIstub shim.ChaincodeStubInterface, args []string) sc.Response {
if len(args) != 2 {
return shim.Error("Incorrect number of arguments. Expecting 2")
}
accountAsBytes, _ := APIstub.GetState(args[0])
account := Account{}
err := json.Unmarshal(accountAsBytes, &account)
if err != nil {
return shim.Error(err.Error())
}
amount, _ := strconv.ParseFloat(args[1], 64)
account.AccountBalance += amount
accountAsBytes, _ = json.Marshal(account)
err = APIstub.PutState(args[0], accountAsBytes)
if err != nil {
return shim.Error(err.Error())
}
return shim.Success(nil)
}
func (s *SmartContract) withdrawFunds(APIstub shim.ChaincodeStubInterface, args []string) sc.Response {
if len(args) != 2 {
return shim.Error("Incorrect number of arguments. Expecting 2")
}
accountAsBytes, _ := APIstub.GetState(args[0])
account := Account{}
err := json.Unmarshal(accountAsBytes, &account)
if err != nil {
return shim.Error(err.Error())
}
amount, _ := strconv.ParseFloat(args[1], 64)
account.AccountBalance -= amount
accountAsBytes, _ = json.Marshal(account)
err = APIstub.PutState(args[0], accountAsBytes)
if err != nil {
return shim.Error(err.Error())
}
return shim.Success(nil)
}
func main() {
// Create a new Smart Contract
err := shim.Start(new(SmartContract))
if err != nil {
fmt.Printf("Error creating new Smart Contract: %s", err)
}
}