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oneSCExecutorMockVM.go
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oneSCExecutorMockVM.go
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package mock
import (
"errors"
"math/big"
"strings"
"github.com/multiversx/mx-chain-core-go/hashing"
"github.com/multiversx/mx-chain-go/process/factory"
"github.com/multiversx/mx-chain-go/process/smartContract/hooks"
vmcommon "github.com/multiversx/mx-chain-vm-common-go"
)
var errNilValue = errors.New("nil value provided")
var errNoArgumentsProvided = errors.New("no arguments provided")
var errInsuficientFunds = errors.New("insufucient funds")
const addFunc = "add"
const withdrawFunc = "withdraw"
const getFunc = "get"
var variableA = []byte("a")
// OneSCExecutorMockVM contains one hardcoded SC with the following behaviour (written in golang):
//-------------------------------------
// var a int
//
// func init(initial int){
// a = initial
// }
//
// func Add(value int){
// a += value
// }
//
// func Get() int{
// return a
// }
//-------------------------------------
type OneSCExecutorMockVM struct {
blockchainHook vmcommon.BlockchainHook
hasher hashing.Hasher
GasForOperation uint64
}
// NewOneSCExecutorMockVM -
func NewOneSCExecutorMockVM(blockchainHook vmcommon.BlockchainHook, hasher hashing.Hasher) (*OneSCExecutorMockVM, error) {
if blockchainHook == nil || hasher == nil {
return nil, errNilValue
}
vm := &OneSCExecutorMockVM{
blockchainHook: blockchainHook,
hasher: hasher,
}
return vm, nil
}
// GetVersion -
func (vm *OneSCExecutorMockVM) GetVersion() string {
return ""
}
// RunSmartContractCreate -
func (vm *OneSCExecutorMockVM) RunSmartContractCreate(input *vmcommon.ContractCreateInput) (*vmcommon.VMOutput, error) {
if input == nil {
return nil, errNilValue
}
if len(input.Arguments) == 0 {
return nil, errNoArgumentsProvided
}
if input.GasProvided < vm.GasForOperation {
return vm.outOfGasFunc(&input.VMInput)
}
initialValue := make([]byte, 0)
if input.Arguments[0] != nil {
initialValue = append(initialValue, input.Arguments[0]...)
}
senderACcount, err := vm.blockchainHook.GetUserAccount(input.CallerAddr)
if err != nil {
return nil, err
}
newSCAddr, err := vm.blockchainHook.NewAddress(input.CallerAddr, senderACcount.GetNonce(), factory.InternalTestingVM)
if err != nil {
return nil, err
}
scOutputAccount := &vmcommon.OutputAccount{
Nonce: 0,
CodeMetadata: input.ContractCodeMetadata,
Code: input.ContractCode,
BalanceDelta: input.CallValue,
Address: newSCAddr,
StorageUpdates: makeStorageUpdatesMap(&vmcommon.StorageUpdate{
//only one variable: a
Offset: variableA,
Data: initialValue,
}),
}
senderOutputAccount := &vmcommon.OutputAccount{
Address: input.CallerAddr,
//VM does not increment sender's nonce
Nonce: senderACcount.GetNonce(),
//tx succeed, return 0 back to the sender
BalanceDelta: big.NewInt(0),
}
return &vmcommon.VMOutput{
OutputAccounts: makeOutputAccountsMap(scOutputAccount, senderOutputAccount),
DeletedAccounts: make([][]byte, 0),
GasRefund: big.NewInt(0),
GasRemaining: input.GasProvided - vm.GasForOperation,
Logs: make([]*vmcommon.LogEntry, 0),
ReturnCode: vmcommon.Ok,
ReturnData: [][]byte{},
TouchedAccounts: make([][]byte, 0),
}, nil
}
// RunSmartContractCall -
func (vm *OneSCExecutorMockVM) RunSmartContractCall(input *vmcommon.ContractCallInput) (*vmcommon.VMOutput, error) {
if input == nil {
return nil, errNilValue
}
if input.Arguments == nil {
return nil, errNilValue
}
if input.GasProvided < vm.GasForOperation {
return vm.outOfGasFunc(&input.VMInput)
}
//make a dummy call to get the SC code, not required here, but to emulate what happens in the real VM
recipientAccount, err := vm.blockchainHook.GetUserAccount(input.RecipientAddr)
if err != nil {
return nil, err
}
if len(vm.blockchainHook.GetCode(recipientAccount)) == 0 {
return nil, hooks.ErrEmptyCode
}
value := big.NewInt(0)
if len(input.Arguments) > 0 {
if input.Arguments[0] != nil {
value.SetBytes(input.Arguments[0])
}
}
method := strings.ToLower(input.Function)
switch method {
case addFunc:
return vm.processAddFunc(input, value)
case withdrawFunc:
return vm.processWithdrawFunc(input, value)
case getFunc:
return vm.processGetFunc(input)
default:
return vm.unavailableFunc(input)
}
}
// GasScheduleChange -
func (vm *OneSCExecutorMockVM) GasScheduleChange(_ map[string]map[string]uint64) {
}
func (vm *OneSCExecutorMockVM) processAddFunc(input *vmcommon.ContractCallInput, value *big.Int) (*vmcommon.VMOutput, error) {
currentValueBuff, _, err := vm.blockchainHook.GetStorageData(input.RecipientAddr, variableA)
if err != nil {
return nil, err
}
currentValue := big.NewInt(0).SetBytes(currentValueBuff)
newValue := big.NewInt(0).Add(currentValue, value)
recipientAccount, err := vm.blockchainHook.GetUserAccount(input.RecipientAddr)
if err != nil {
return nil, err
}
scOutputAccount := &vmcommon.OutputAccount{
Nonce: recipientAccount.GetNonce(),
BalanceDelta: input.CallValue,
Address: input.RecipientAddr,
StorageUpdates: makeStorageUpdatesMap(&vmcommon.StorageUpdate{
//only one variable: a
Offset: variableA,
Data: newValue.Bytes(),
}),
}
senderAccount, err := vm.blockchainHook.GetUserAccount(input.CallerAddr)
if err != nil {
return nil, err
}
senderOutputAccount := &vmcommon.OutputAccount{
Address: input.CallerAddr,
//VM does not increment sender's nonce
Nonce: senderAccount.GetNonce(),
//tx succeed, return 0 back to the sender
BalanceDelta: big.NewInt(0),
}
return &vmcommon.VMOutput{
OutputAccounts: makeOutputAccountsMap(scOutputAccount, senderOutputAccount),
DeletedAccounts: make([][]byte, 0),
GasRefund: big.NewInt(0),
GasRemaining: input.GasProvided - vm.GasForOperation,
Logs: make([]*vmcommon.LogEntry, 0),
ReturnCode: vmcommon.Ok,
ReturnData: [][]byte{},
TouchedAccounts: make([][]byte, 0),
}, nil
}
func (vm *OneSCExecutorMockVM) processWithdrawFunc(input *vmcommon.ContractCallInput, value *big.Int) (*vmcommon.VMOutput, error) {
destAccount, err := vm.blockchainHook.GetUserAccount(input.RecipientAddr)
if err != nil {
return nil, err
}
destBalance := destAccount.GetBalance()
if destBalance.Cmp(value) < 0 {
return nil, errInsuficientFunds
}
newSCBalance := big.NewInt(0).Sub(big.NewInt(0), value)
scOutputAccount := &vmcommon.OutputAccount{
Nonce: destAccount.GetNonce(),
BalanceDelta: newSCBalance,
Address: input.RecipientAddr,
}
senderAccount, err := vm.blockchainHook.GetUserAccount(input.CallerAddr)
if err != nil {
return nil, err
}
senderOutputAccount := &vmcommon.OutputAccount{
Address: input.CallerAddr,
//VM does not increment sender's nonce
Nonce: senderAccount.GetNonce(),
//tx succeed, return 0 back to the sender
BalanceDelta: value,
}
return &vmcommon.VMOutput{
OutputAccounts: makeOutputAccountsMap(scOutputAccount, senderOutputAccount),
DeletedAccounts: make([][]byte, 0),
GasRefund: big.NewInt(0),
GasRemaining: input.GasProvided - vm.GasForOperation,
Logs: make([]*vmcommon.LogEntry, 0),
ReturnCode: vmcommon.Ok,
ReturnData: [][]byte{},
TouchedAccounts: make([][]byte, 0),
}, nil
}
func (vm *OneSCExecutorMockVM) processGetFunc(input *vmcommon.ContractCallInput) (*vmcommon.VMOutput, error) {
currentValueBuff, _, err := vm.blockchainHook.GetStorageData(input.RecipientAddr, variableA)
if err != nil {
return nil, err
}
destAccount, err := vm.blockchainHook.GetUserAccount(input.RecipientAddr)
if err != nil {
return nil, err
}
scOutputAccount := &vmcommon.OutputAccount{
Nonce: destAccount.GetNonce(),
BalanceDelta: input.CallValue,
Address: input.RecipientAddr,
StorageUpdates: make(map[string]*vmcommon.StorageUpdate),
}
return &vmcommon.VMOutput{
OutputAccounts: makeOutputAccountsMap(scOutputAccount),
DeletedAccounts: make([][]byte, 0),
GasRefund: big.NewInt(0),
GasRemaining: input.GasProvided - vm.GasForOperation,
Logs: make([]*vmcommon.LogEntry, 0),
ReturnCode: vmcommon.Ok,
ReturnData: [][]byte{currentValueBuff},
TouchedAccounts: make([][]byte, 0),
}, nil
}
func (vm *OneSCExecutorMockVM) unavailableFunc(input *vmcommon.ContractCallInput) (*vmcommon.VMOutput, error) {
destAccount, err := vm.blockchainHook.GetUserAccount(input.RecipientAddr)
if err != nil {
return nil, err
}
scOutputAccount := &vmcommon.OutputAccount{
Nonce: destAccount.GetNonce(),
Address: input.RecipientAddr,
StorageUpdates: make(map[string]*vmcommon.StorageUpdate),
}
return &vmcommon.VMOutput{
OutputAccounts: makeOutputAccountsMap(scOutputAccount),
DeletedAccounts: make([][]byte, 0),
GasRefund: big.NewInt(0),
GasRemaining: 0,
Logs: make([]*vmcommon.LogEntry, 0),
ReturnCode: vmcommon.FunctionNotFound,
ReturnData: [][]byte{},
TouchedAccounts: make([][]byte, 0),
}, nil
}
func (vm *OneSCExecutorMockVM) outOfGasFunc(input *vmcommon.VMInput) (*vmcommon.VMOutput, error) {
callerAccount, err := vm.blockchainHook.GetUserAccount(input.CallerAddr)
if err != nil {
return nil, err
}
vmo := &vmcommon.OutputAccount{
BalanceDelta: big.NewInt(0),
Address: input.CallerAddr,
Nonce: callerAccount.GetNonce(),
}
return &vmcommon.VMOutput{
OutputAccounts: makeOutputAccountsMap(vmo),
DeletedAccounts: make([][]byte, 0),
GasRefund: big.NewInt(0),
GasRemaining: 0,
Logs: make([]*vmcommon.LogEntry, 0),
ReturnCode: vmcommon.OutOfGas,
ReturnData: [][]byte{},
TouchedAccounts: make([][]byte, 0),
}, nil
}
func makeStorageUpdatesMap(updates ...*vmcommon.StorageUpdate) map[string]*vmcommon.StorageUpdate {
if len(updates) == 0 {
return make(map[string]*vmcommon.StorageUpdate)
}
updatesMap := make(map[string]*vmcommon.StorageUpdate, len(updates))
for _, update := range updates {
updatesMap[string(update.Offset)] = update
}
return updatesMap
}
func makeOutputAccountsMap(accounts ...*vmcommon.OutputAccount) map[string]*vmcommon.OutputAccount {
if accounts == nil {
return make(map[string]*vmcommon.OutputAccount)
}
accountsMap := make(map[string]*vmcommon.OutputAccount, len(accounts))
for _, account := range accounts {
accountsMap[string(account.Address)] = account
}
return accountsMap
}
// Close -
func (vm *OneSCExecutorMockVM) Close() error {
return nil
}
// IsInterfaceNil returns true if there is no value under the interface
func (vm *OneSCExecutorMockVM) IsInterfaceNil() bool {
return vm == nil
}