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transactionType.go
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transactionType.go
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package coordinator
import (
"bytes"
"github.com/ElrondNetwork/elrond-go/data"
"github.com/ElrondNetwork/elrond-go/data/rewardTx"
"github.com/ElrondNetwork/elrond-go/data/state"
"github.com/ElrondNetwork/elrond-go/process"
"github.com/ElrondNetwork/elrond-go/sharding"
)
type txTypeHandler struct {
adrConv state.AddressConverter
shardCoordinator sharding.Coordinator
accounts state.AccountsAdapter
}
// NewTxTypeHandler creates a transaction type handler
func NewTxTypeHandler(
adrConv state.AddressConverter,
shardCoordinator sharding.Coordinator,
accounts state.AccountsAdapter,
) (*txTypeHandler, error) {
if adrConv == nil {
return nil, process.ErrNilAddressConverter
}
if shardCoordinator == nil {
return nil, process.ErrNilShardCoordinator
}
if accounts == nil {
return nil, process.ErrNilAccountsAdapter
}
tc := &txTypeHandler{
adrConv: adrConv,
shardCoordinator: shardCoordinator,
accounts: accounts,
}
return tc, nil
}
// ComputeTransactionType calculates the transaction type
func (tth *txTypeHandler) ComputeTransactionType(tx data.TransactionHandler) (process.TransactionType, error) {
err := tth.checkTxValidity(tx)
if err != nil {
return process.InvalidTransaction, err
}
_, isRewardTx := tx.(*rewardTx.RewardTx)
if isRewardTx {
return process.RewardTx, nil
}
isEmptyAddress := tth.isDestAddressEmpty(tx)
if isEmptyAddress {
if len(tx.GetData()) > 0 {
return process.SCDeployment, nil
}
return process.InvalidTransaction, process.ErrWrongTransaction
}
acntDst, err := tth.getAccountFromAddress(tx.GetRecvAddress())
if err != nil {
return process.InvalidTransaction, err
}
if acntDst == nil {
return process.MoveBalance, nil
}
if !acntDst.IsInterfaceNil() && len(acntDst.GetCode()) > 0 && len(tx.GetData()) > 0 {
return process.SCInvoking, nil
}
return process.MoveBalance, nil
}
func (tth *txTypeHandler) isDestAddressEmpty(tx data.TransactionHandler) bool {
isEmptyAddress := bytes.Equal(tx.GetRecvAddress(), make([]byte, tth.adrConv.AddressLen()))
return isEmptyAddress
}
func (tth *txTypeHandler) getAccountFromAddress(address []byte) (state.AccountHandler, error) {
adrSrc, err := tth.adrConv.CreateAddressFromPublicKeyBytes(address)
if err != nil {
return nil, err
}
shardForCurrentNode := tth.shardCoordinator.SelfId()
shardForSrc := tth.shardCoordinator.ComputeId(adrSrc)
if shardForCurrentNode != shardForSrc {
return nil, nil
}
acnt, err := tth.accounts.GetAccountWithJournal(adrSrc)
if err != nil {
return nil, err
}
return acnt, nil
}
func (tth *txTypeHandler) checkTxValidity(tx data.TransactionHandler) error {
if tx == nil || tx.IsInterfaceNil() {
return process.ErrNilTransaction
}
recvAddressIsInvalid := tth.adrConv.AddressLen() != len(tx.GetRecvAddress())
if recvAddressIsInvalid {
return process.ErrWrongTransaction
}
return nil
}
// IsInterfaceNil returns true if there is no value under the interface
func (tth *txTypeHandler) IsInterfaceNil() bool {
return tth == nil
}