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txValidator.go
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txValidator.go
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package dataValidators
import (
"fmt"
"github.com/ElrondNetwork/elrond-go-core/core"
"github.com/ElrondNetwork/elrond-go-core/core/check"
"github.com/ElrondNetwork/elrond-go/process"
"github.com/ElrondNetwork/elrond-go/process/interceptors/processor"
"github.com/ElrondNetwork/elrond-go/sharding"
"github.com/ElrondNetwork/elrond-go/state"
)
var _ process.TxValidator = (*txValidator)(nil)
// txValidator represents a tx handler validator that doesn't check the validity of provided txHandler
type txValidator struct {
accounts state.AccountsAdapter
shardCoordinator sharding.Coordinator
whiteListHandler process.WhiteListHandler
pubkeyConverter core.PubkeyConverter
maxNonceDeltaAllowed int
}
// NewTxValidator creates a new nil tx handler validator instance
func NewTxValidator(
accounts state.AccountsAdapter,
shardCoordinator sharding.Coordinator,
whiteListHandler process.WhiteListHandler,
pubkeyConverter core.PubkeyConverter,
maxNonceDeltaAllowed int,
) (*txValidator, error) {
if check.IfNil(accounts) {
return nil, process.ErrNilAccountsAdapter
}
if check.IfNil(shardCoordinator) {
return nil, process.ErrNilShardCoordinator
}
if check.IfNil(whiteListHandler) {
return nil, process.ErrNilWhiteListHandler
}
if check.IfNil(pubkeyConverter) {
return nil, fmt.Errorf("%w in NewTxValidator", process.ErrNilPubkeyConverter)
}
return &txValidator{
accounts: accounts,
shardCoordinator: shardCoordinator,
whiteListHandler: whiteListHandler,
maxNonceDeltaAllowed: maxNonceDeltaAllowed,
pubkeyConverter: pubkeyConverter,
}, nil
}
// CheckTxValidity will filter transactions that needs to be added in pools
func (txv *txValidator) CheckTxValidity(interceptedTx process.TxValidatorHandler) error {
// TODO: Refactor, extract methods.
interceptedData, ok := interceptedTx.(process.InterceptedData)
if ok {
if txv.whiteListHandler.IsWhiteListed(interceptedData) {
return nil
}
}
shardID := txv.shardCoordinator.SelfId()
txShardID := interceptedTx.SenderShardId()
senderIsInAnotherShard := shardID != txShardID
if senderIsInAnotherShard {
return nil
}
senderAddress := interceptedTx.SenderAddress()
accountHandler, err := txv.accounts.GetExistingAccount(senderAddress)
if err != nil {
return fmt.Errorf("%w for address %s and shard %d, err: %s",
process.ErrAccountNotFound,
txv.pubkeyConverter.Encode(senderAddress),
shardID,
err.Error(),
)
}
accountNonce := accountHandler.GetNonce()
txNonce := interceptedTx.Nonce()
lowerNonceInTx := txNonce < accountNonce
veryHighNonceInTx := txNonce > accountNonce+uint64(txv.maxNonceDeltaAllowed)
isTxRejected := lowerNonceInTx || veryHighNonceInTx
if isTxRejected {
return fmt.Errorf("%w lowerNonceInTx: %v, veryHighNonceInTx: %v",
process.ErrWrongTransaction,
lowerNonceInTx,
veryHighNonceInTx,
)
}
account, ok := accountHandler.(state.UserAccountHandler)
if !ok {
return fmt.Errorf("%w, account is not of type *state.Account, address: %s",
process.ErrWrongTypeAssertion,
txv.pubkeyConverter.Encode(senderAddress),
)
}
accountBalance := account.GetBalance()
txFee := interceptedTx.Fee()
if accountBalance.Cmp(txFee) < 0 {
return fmt.Errorf("%w, for address: %s, wanted %v, have %v",
process.ErrInsufficientFunds,
txv.pubkeyConverter.Encode(senderAddress),
txFee,
accountBalance,
)
}
return nil
}
// CheckTxWhiteList will check if the cross shard transactions are whitelisted and could be added in pools
func (txv *txValidator) CheckTxWhiteList(data process.InterceptedData) error {
interceptedTx, ok := data.(processor.InterceptedTransactionHandler)
if !ok {
return process.ErrWrongTypeAssertion
}
isTxCrossShardDestMe := interceptedTx.SenderShardId() != txv.shardCoordinator.SelfId() &&
interceptedTx.ReceiverShardId() == txv.shardCoordinator.SelfId()
if !isTxCrossShardDestMe {
return nil
}
if txv.whiteListHandler.IsWhiteListed(data) {
return nil
}
return process.ErrTransactionIsNotWhitelisted
}
// IsInterfaceNil returns true if there is no value under the interface
func (txv *txValidator) IsInterfaceNil() bool {
return txv == nil
}