package mempool import ( "math/big" "sort" "testing" "github.com/nspcc-dev/neo-go/pkg/config/netmode" "github.com/nspcc-dev/neo-go/pkg/core/transaction" "github.com/nspcc-dev/neo-go/pkg/util" "github.com/nspcc-dev/neo-go/pkg/vm/opcode" "github.com/stretchr/testify/assert" "github.com/stretchr/testify/require" ) type FeerStub struct { feePerByte int64 } var balance = big.NewInt(10000000) func (fs *FeerStub) FeePerByte() int64 { return fs.feePerByte } func (fs *FeerStub) GetUtilityTokenBalance(uint160 util.Uint160) *big.Int { return balance } func testMemPoolAddRemoveWithFeer(t *testing.T, fs Feer) { mp := NewMemPool(10) tx := transaction.New(netmode.UnitTestNet, []byte{byte(opcode.PUSH1)}, 0) tx.Nonce = 0 _, ok := mp.TryGetValue(tx.Hash()) require.Equal(t, false, ok) require.NoError(t, mp.Add(tx, fs)) // Re-adding should fail. require.Error(t, mp.Add(tx, fs)) tx2, ok := mp.TryGetValue(tx.Hash()) require.Equal(t, true, ok) require.Equal(t, tx, tx2) mp.Remove(tx.Hash()) _, ok = mp.TryGetValue(tx.Hash()) require.Equal(t, false, ok) // Make sure nothing left in the mempool after removal. assert.Equal(t, 0, len(mp.verifiedMap)) assert.Equal(t, 0, len(mp.verifiedTxes)) } func TestMemPoolAddRemove(t *testing.T) { var fs = &FeerStub{} testMemPoolAddRemoveWithFeer(t, fs) } func TestOverCapacity(t *testing.T) { var fs = &FeerStub{} const mempoolSize = 10 mp := NewMemPool(mempoolSize) for i := 0; i < mempoolSize; i++ { tx := transaction.New(netmode.UnitTestNet, []byte{byte(opcode.PUSH1)}, 0) tx.Nonce = uint32(i) require.NoError(t, mp.Add(tx, fs)) } txcnt := uint32(mempoolSize) require.Equal(t, mempoolSize, mp.Count()) require.Equal(t, true, sort.IsSorted(sort.Reverse(mp.verifiedTxes))) // Fees are also prioritized. for i := 0; i < mempoolSize; i++ { tx := transaction.New(netmode.UnitTestNet, []byte{byte(opcode.PUSH1)}, 0) tx.Attributes = append(tx.Attributes, transaction.Attribute{ Usage: transaction.DescriptionURL, Data: util.Uint256{1, 2, 3, 4}.BytesBE(), }) tx.NetworkFee = 10000 tx.Nonce = txcnt txcnt++ // size is 84, networkFee is 10000 => feePerByte is 119 require.NoError(t, mp.Add(tx, fs)) require.Equal(t, mempoolSize, mp.Count()) require.Equal(t, true, sort.IsSorted(sort.Reverse(mp.verifiedTxes))) } // Less prioritized txes are not allowed anymore. tx := transaction.New(netmode.UnitTestNet, []byte{byte(opcode.PUSH1)}, 0) tx.Attributes = append(tx.Attributes, transaction.Attribute{ Usage: transaction.DescriptionURL, Data: util.Uint256{1, 2, 3, 4}.BytesBE(), }) tx.NetworkFee = 100 tx.Nonce = txcnt txcnt++ require.Error(t, mp.Add(tx, fs)) require.Equal(t, mempoolSize, mp.Count()) require.Equal(t, true, sort.IsSorted(sort.Reverse(mp.verifiedTxes))) // Low net fee, but higher per-byte fee is still a better combination. tx = transaction.New(netmode.UnitTestNet, []byte{byte(opcode.PUSH1)}, 0) tx.Nonce = txcnt tx.NetworkFee = 7000 txcnt++ // size is 51 (no attributes), networkFee is 7000 (<10000) // => feePerByte is 137 (>119) require.NoError(t, mp.Add(tx, fs)) require.Equal(t, mempoolSize, mp.Count()) require.Equal(t, true, sort.IsSorted(sort.Reverse(mp.verifiedTxes))) // High priority always wins over low priority. for i := 0; i < mempoolSize; i++ { tx := transaction.New(netmode.UnitTestNet, []byte{byte(opcode.PUSH1)}, 0) tx.NetworkFee = 8000 tx.Nonce = txcnt txcnt++ require.NoError(t, mp.Add(tx, fs)) require.Equal(t, mempoolSize, mp.Count()) require.Equal(t, true, sort.IsSorted(sort.Reverse(mp.verifiedTxes))) } // Good luck with low priority now. tx = transaction.New(netmode.UnitTestNet, []byte{byte(opcode.PUSH1)}, 0) tx.Nonce = txcnt tx.NetworkFee = 7000 require.Error(t, mp.Add(tx, fs)) require.Equal(t, mempoolSize, mp.Count()) require.Equal(t, true, sort.IsSorted(sort.Reverse(mp.verifiedTxes))) } func TestGetVerified(t *testing.T) { var fs = &FeerStub{} const mempoolSize = 10 mp := NewMemPool(mempoolSize) txes := make([]*transaction.Transaction, 0, mempoolSize) for i := 0; i < mempoolSize; i++ { tx := transaction.New(netmode.UnitTestNet, []byte{byte(opcode.PUSH1)}, 0) tx.Nonce = uint32(i) txes = append(txes, tx) require.NoError(t, mp.Add(tx, fs)) } require.Equal(t, mempoolSize, mp.Count()) verTxes := mp.GetVerifiedTransactions() require.Equal(t, mempoolSize, len(verTxes)) require.ElementsMatch(t, txes, verTxes) for _, tx := range txes { mp.Remove(tx.Hash()) } verTxes = mp.GetVerifiedTransactions() require.Equal(t, 0, len(verTxes)) } func TestRemoveStale(t *testing.T) { var fs = &FeerStub{} const mempoolSize = 10 mp := NewMemPool(mempoolSize) txes1 := make([]*transaction.Transaction, 0, mempoolSize/2) txes2 := make([]*transaction.Transaction, 0, mempoolSize/2) for i := 0; i < mempoolSize; i++ { tx := transaction.New(netmode.UnitTestNet, []byte{byte(opcode.PUSH1)}, 0) tx.Nonce = uint32(i) if i%2 == 0 { txes1 = append(txes1, tx) } else { txes2 = append(txes2, tx) } require.NoError(t, mp.Add(tx, fs)) } require.Equal(t, mempoolSize, mp.Count()) mp.RemoveStale(func(t *transaction.Transaction) bool { for _, tx := range txes2 { if tx == t { return true } } return false }, &FeerStub{}) require.Equal(t, mempoolSize/2, mp.Count()) verTxes := mp.GetVerifiedTransactions() for _, txf := range verTxes { require.NotContains(t, txes1, txf) require.Contains(t, txes2, txf) } } func TestMemPoolFees(t *testing.T) { mp := NewMemPool(10) sender0 := util.Uint160{1, 2, 3} tx0 := transaction.New(netmode.UnitTestNet, []byte{byte(opcode.PUSH1)}, 0) tx0.NetworkFee = balance.Int64() + 1 tx0.Sender = sender0 // insufficient funds to add transaction, and balance shouldn't be stored require.Equal(t, false, mp.Verify(tx0, &FeerStub{})) require.Error(t, mp.Add(tx0, &FeerStub{})) require.Equal(t, 0, len(mp.fees)) balancePart := new(big.Int).Div(balance, big.NewInt(4)) // no problems with adding another transaction with lower fee tx1 := transaction.New(netmode.UnitTestNet, []byte{byte(opcode.PUSH1)}, 0) tx1.NetworkFee = balancePart.Int64() tx1.Sender = sender0 require.NoError(t, mp.Add(tx1, &FeerStub{})) require.Equal(t, 1, len(mp.fees)) require.Equal(t, utilityBalanceAndFees{ balance: balance, feeSum: tx1.NetworkFee, }, mp.fees[sender0]) // balance shouldn't change after adding one more transaction tx2 := transaction.New(netmode.UnitTestNet, []byte{byte(opcode.PUSH1)}, 0) tx2.NetworkFee = new(big.Int).Sub(balance, balancePart).Int64() tx2.Sender = sender0 require.NoError(t, mp.Add(tx2, &FeerStub{})) require.Equal(t, 2, len(mp.verifiedTxes)) require.Equal(t, 1, len(mp.fees)) require.Equal(t, utilityBalanceAndFees{ balance: balance, feeSum: balance.Int64(), }, mp.fees[sender0]) // can't add more transactions as we don't have enough GAS tx3 := transaction.New(netmode.UnitTestNet, []byte{byte(opcode.PUSH1)}, 0) tx3.NetworkFee = 1 tx3.Sender = sender0 require.Equal(t, false, mp.Verify(tx3, &FeerStub{})) require.Error(t, mp.Add(tx3, &FeerStub{})) require.Equal(t, 1, len(mp.fees)) require.Equal(t, utilityBalanceAndFees{ balance: balance, feeSum: balance.Int64(), }, mp.fees[sender0]) // check whether sender's fee updates correctly mp.RemoveStale(func(t *transaction.Transaction) bool { if t == tx2 { return true } return false }, &FeerStub{}) require.Equal(t, 1, len(mp.fees)) require.Equal(t, utilityBalanceAndFees{ balance: balance, feeSum: tx2.NetworkFee, }, mp.fees[sender0]) // there should be nothing left mp.RemoveStale(func(t *transaction.Transaction) bool { if t == tx3 { return true } return false }, &FeerStub{}) require.Equal(t, 0, len(mp.fees)) }