Reject from mempool txs with too many outputs of less than 1 KAS

domain/miningmanager/mempool/mempool.go

@@ -1,8 +1,6 @@
 package mempool
 
 import (
-	"github.com/kaspanet/kaspad/domain/consensus/utils/consensushashing"
-	"github.com/kaspanet/kaspad/domain/consensus/utils/constants"
 	"sync"
 
 	"github.com/kaspanet/kaspad/domain/consensusreference"
@@ -143,57 +141,7 @@ func (mp *mempool) BlockCandidateTransactions() []*externalapi.DomainTransaction
 	mp.mtx.RLock()
 	defer mp.mtx.RUnlock()
 
-	readyTxs := mp.transactionsPool.allReadyTransactions()
-	var candidateTxs []*externalapi.DomainTransaction
-	var spamTx *externalapi.DomainTransaction
-	var spamTxNewestUTXODaaScore uint64
-	for _, tx := range readyTxs {
-		if len(tx.Outputs) > len(tx.Inputs) {
-			numExtraOuts := len(tx.Outputs) - len(tx.Inputs)
-			if numExtraOuts > 2 && tx.Fee < uint64(numExtraOuts)*constants.SompiPerKaspa {
-				log.Debugf("Filtered spam tx %s", consensushashing.TransactionID(tx))
-				continue
-			}
-
-			hasCoinbaseInput := false
-			for _, input := range tx.Inputs {
-				if input.UTXOEntry.IsCoinbase() {
-					hasCoinbaseInput = true
-					break
-				}
-			}
-
-			if hasCoinbaseInput || tx.Fee > uint64(numExtraOuts)*constants.SompiPerKaspa {
-				candidateTxs = append(candidateTxs, tx)
-			} else {
-				txNewestUTXODaaScore := tx.Inputs[0].UTXOEntry.BlockDAAScore()
-				for _, input := range tx.Inputs {
-					if input.UTXOEntry.BlockDAAScore() > txNewestUTXODaaScore {
-						txNewestUTXODaaScore = input.UTXOEntry.BlockDAAScore()
-					}
-				}
-
-				if spamTx != nil {
-					if txNewestUTXODaaScore < spamTxNewestUTXODaaScore {
-						spamTx = tx
-						spamTxNewestUTXODaaScore = txNewestUTXODaaScore
-					}
-				} else {
-					spamTx = tx
-					spamTxNewestUTXODaaScore = txNewestUTXODaaScore
-				}
-			}
-		} else {
-			candidateTxs = append(candidateTxs, tx)
-		}
-	}
-
-	if spamTx != nil {
-		log.Debugf("Adding spam tx candidate %s", consensushashing.TransactionID(spamTx))
-		candidateTxs = append(candidateTxs, spamTx)
-	}
-
-	return candidateTxs
+	return mp.transactionsPool.allReadyTransactions()
 }
 
 func (mp *mempool) RevalidateHighPriorityTransactions() (validTransactions []*externalapi.DomainTransaction, err error) {

domain/miningmanager/mempool/validate_and_insert_transaction.go

@@ -17,6 +17,18 @@ func (mp *mempool) validateAndInsertTransaction(transaction *externalapi.DomainT
 		fmt.Sprintf("validateAndInsertTransaction %s", consensushashing.TransactionID(transaction)))
 	defer onEnd()
 
+	numOutsLessThanOneKas := 0
+	for _, output := range transaction.Outputs {
+		if output.Value < constants.SompiPerKaspa {
+			numOutsLessThanOneKas += 1
+		}
+	}
+
+	if numOutsLessThanOneKas > len(transaction.Inputs) {
+		log.Warnf("Rejected transaction with %d outputs with less than 1 KAS")
+		return nil, nil
+	}
+
 	// Populate mass in the beginning, it will be used in multiple places throughout the validation and insertion.
 	mp.consensusReference.Consensus().PopulateMass(transaction)
 
@@ -30,12 +42,6 @@ func (mp *mempool) validateAndInsertTransaction(transaction *externalapi.DomainT
 		return nil, err
 	}
 
-	numExtraOuts := len(transaction.Outputs) - len(transaction.Inputs)
-	if numExtraOuts > 2 && transaction.Fee < uint64(numExtraOuts)*constants.SompiPerKaspa {
-		log.Warnf("Rejected spam tx %s from mempool", consensushashing.TransactionID(transaction))
-		return nil, nil
-	}
-
 	if len(missingOutpoints) > 0 {
 		if !allowOrphan {
 			str := fmt.Sprintf("Transaction %s is an orphan, where allowOrphan = false",