package mempool import ( "errors" "math/big" "sort" "testing" "time" "github.com/nspcc-dev/neo-go/internal/random" "github.com/nspcc-dev/neo-go/pkg/core/transaction" "github.com/nspcc-dev/neo-go/pkg/network/payload" "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 p2pSigExt bool blockHeight uint32 balance int64 } func (fs *FeerStub) GetBaseExecFee() int64 { return 30 } func (fs *FeerStub) FeePerByte() int64 { return fs.feePerByte } func (fs *FeerStub) BlockHeight() uint32 { return fs.blockHeight } func (fs *FeerStub) GetUtilityTokenBalance(uint160 util.Uint160) *big.Int { return big.NewInt(fs.balance) } func (fs *FeerStub) P2PSigExtensionsEnabled() bool { return fs.p2pSigExt } func testMemPoolAddRemoveWithFeer(t *testing.T, fs Feer) { mp := New(10, 0, false) tx := transaction.New([]byte{byte(opcode.PUSH1)}, 0) tx.Nonce = 0 tx.Signers = []transaction.Signer{{Account: util.Uint160{1, 2, 3}}} _, 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(), fs) _, 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 TestMemPoolRemoveStale(t *testing.T) { mp := New(5, 0, false) txs := make([]*transaction.Transaction, 5) for i := range txs { txs[i] = transaction.New([]byte{byte(opcode.PUSH1)}, 0) txs[i].Nonce = uint32(i) txs[i].Signers = []transaction.Signer{{Account: util.Uint160{1, 2, 3}}} require.NoError(t, mp.Add(txs[i], &FeerStub{blockHeight: uint32(i)})) } staleTxs := make(chan *transaction.Transaction, 5) f := func(tx *transaction.Transaction, _ interface{}) { staleTxs <- tx } mp.SetResendThreshold(5, f) isValid := func(tx *transaction.Transaction) bool { return tx.Nonce%2 == 0 } mp.RemoveStale(isValid, &FeerStub{blockHeight: 5}) // 0 + 5 require.Eventually(t, func() bool { return len(staleTxs) == 1 }, time.Second, time.Millisecond*100) require.Equal(t, txs[0], <-staleTxs) mp.RemoveStale(isValid, &FeerStub{blockHeight: 7}) // 2 + 5 require.Eventually(t, func() bool { return len(staleTxs) == 1 }, time.Second, time.Millisecond*100) require.Equal(t, txs[2], <-staleTxs) mp.RemoveStale(isValid, &FeerStub{blockHeight: 10}) // 0 + 2 * 5 require.Eventually(t, func() bool { return len(staleTxs) == 1 }, time.Second, time.Millisecond*100) require.Equal(t, txs[0], <-staleTxs) mp.RemoveStale(isValid, &FeerStub{blockHeight: 15}) // 0 + 3 * 5 // tx[2] should appear, so it is also checked that tx[0] wasn't sent on height 15. mp.RemoveStale(isValid, &FeerStub{blockHeight: 22}) // 2 + 4 * 5 require.Eventually(t, func() bool { return len(staleTxs) == 1 }, time.Second, time.Millisecond*100) require.Equal(t, txs[2], <-staleTxs) // panic if something is sent after this. close(staleTxs) require.Len(t, staleTxs, 0) } func TestMemPoolAddRemove(t *testing.T) { var fs = &FeerStub{} testMemPoolAddRemoveWithFeer(t, fs) } func TestOverCapacity(t *testing.T) { var fs = &FeerStub{balance: 10000000} const mempoolSize = 10 mp := New(mempoolSize, 0, false) for i := 0; i < mempoolSize; i++ { tx := transaction.New([]byte{byte(opcode.PUSH1)}, 0) tx.Nonce = uint32(i) tx.Signers = []transaction.Signer{{Account: util.Uint160{1, 2, 3}}} 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))) bigScript := make([]byte, 64) bigScript[0] = byte(opcode.PUSH1) bigScript[1] = byte(opcode.RET) // Fees are also prioritized. for i := 0; i < mempoolSize; i++ { tx := transaction.New(bigScript, 0) tx.NetworkFee = 10000 tx.Nonce = txcnt tx.Signers = []transaction.Signer{{Account: util.Uint160{1, 2, 3}}} txcnt++ // size is ~90, 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(bigScript, 0) tx.NetworkFee = 100 tx.Nonce = txcnt tx.Signers = []transaction.Signer{{Account: util.Uint160{1, 2, 3}}} txcnt++ require.Error(t, mp.Add(tx, fs)) require.Equal(t, mempoolSize, mp.Count()) require.Equal(t, mempoolSize, len(mp.verifiedMap)) require.Equal(t, mempoolSize, len(mp.verifiedTxes)) require.False(t, mp.containsKey(tx.Hash())) 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([]byte{byte(opcode.PUSH1)}, 0) tx.Nonce = txcnt tx.NetworkFee = 7000 tx.Signers = []transaction.Signer{{Account: util.Uint160{1, 2, 3}}} txcnt++ // size is ~51 (small script), 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([]byte{byte(opcode.PUSH1)}, 0) tx.NetworkFee = 8000 tx.Nonce = txcnt tx.Signers = []transaction.Signer{{Account: util.Uint160{1, 2, 3}}} 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([]byte{byte(opcode.PUSH1)}, 0) tx.Nonce = txcnt tx.NetworkFee = 7000 tx.Signers = []transaction.Signer{{Account: util.Uint160{1, 2, 3}}} 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 := New(mempoolSize, 0, false) txes := make([]*transaction.Transaction, 0, mempoolSize) for i := 0; i < mempoolSize; i++ { tx := transaction.New([]byte{byte(opcode.PUSH1)}, 0) tx.Nonce = uint32(i) tx.Signers = []transaction.Signer{{Account: util.Uint160{1, 2, 3}}} 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(), fs) } verTxes = mp.GetVerifiedTransactions() require.Equal(t, 0, len(verTxes)) } func TestRemoveStale(t *testing.T) { var fs = &FeerStub{} const mempoolSize = 10 mp := New(mempoolSize, 0, false) txes1 := make([]*transaction.Transaction, 0, mempoolSize/2) txes2 := make([]*transaction.Transaction, 0, mempoolSize/2) for i := 0; i < mempoolSize; i++ { tx := transaction.New([]byte{byte(opcode.PUSH1)}, 0) tx.Nonce = uint32(i) tx.Signers = []transaction.Signer{{Account: util.Uint160{1, 2, 3}}} 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 := New(10, 0, false) fs := &FeerStub{balance: 10000000} sender0 := util.Uint160{1, 2, 3} tx0 := transaction.New([]byte{byte(opcode.PUSH1)}, 0) tx0.NetworkFee = fs.balance + 1 tx0.Signers = []transaction.Signer{{Account: sender0}} // insufficient funds to add transaction, and balance shouldn't be stored require.Equal(t, false, mp.Verify(tx0, fs)) require.Error(t, mp.Add(tx0, fs)) require.Equal(t, 0, len(mp.fees)) balancePart := new(big.Int).Div(big.NewInt(fs.balance), big.NewInt(4)) // no problems with adding another transaction with lower fee tx1 := transaction.New([]byte{byte(opcode.PUSH1)}, 0) tx1.NetworkFee = balancePart.Int64() tx1.Signers = []transaction.Signer{{Account: sender0}} require.NoError(t, mp.Add(tx1, fs)) require.Equal(t, 1, len(mp.fees)) require.Equal(t, utilityBalanceAndFees{ balance: big.NewInt(fs.balance), feeSum: big.NewInt(tx1.NetworkFee), }, mp.fees[sender0]) // balance shouldn't change after adding one more transaction tx2 := transaction.New([]byte{byte(opcode.PUSH1)}, 0) tx2.NetworkFee = new(big.Int).Sub(big.NewInt(fs.balance), balancePart).Int64() tx2.Signers = []transaction.Signer{{Account: sender0}} require.NoError(t, mp.Add(tx2, fs)) require.Equal(t, 2, len(mp.verifiedTxes)) require.Equal(t, 1, len(mp.fees)) require.Equal(t, utilityBalanceAndFees{ balance: big.NewInt(fs.balance), feeSum: big.NewInt(fs.balance), }, mp.fees[sender0]) // can't add more transactions as we don't have enough GAS tx3 := transaction.New([]byte{byte(opcode.PUSH1)}, 0) tx3.NetworkFee = 1 tx3.Signers = []transaction.Signer{{Account: sender0}} require.Equal(t, false, mp.Verify(tx3, fs)) require.Error(t, mp.Add(tx3, fs)) require.Equal(t, 1, len(mp.fees)) require.Equal(t, utilityBalanceAndFees{ balance: big.NewInt(fs.balance), feeSum: big.NewInt(fs.balance), }, mp.fees[sender0]) // check whether sender's fee updates correctly mp.RemoveStale(func(t *transaction.Transaction) bool { if t == tx2 { return true } return false }, fs) require.Equal(t, 1, len(mp.fees)) require.Equal(t, utilityBalanceAndFees{ balance: big.NewInt(fs.balance), feeSum: big.NewInt(tx2.NetworkFee), }, mp.fees[sender0]) // there should be nothing left mp.RemoveStale(func(t *transaction.Transaction) bool { if t == tx3 { return true } return false }, fs) require.Equal(t, 0, len(mp.fees)) } func TestMempoolItemsOrder(t *testing.T) { sender0 := util.Uint160{1, 2, 3} balance := big.NewInt(10000000) tx1 := transaction.New([]byte{byte(opcode.PUSH1)}, 0) tx1.NetworkFee = new(big.Int).Div(balance, big.NewInt(8)).Int64() tx1.Signers = []transaction.Signer{{Account: sender0}} tx1.Attributes = []transaction.Attribute{{Type: transaction.HighPriority}} item1 := item{txn: tx1} tx2 := transaction.New([]byte{byte(opcode.PUSH1)}, 0) tx2.NetworkFee = new(big.Int).Div(balance, big.NewInt(16)).Int64() tx2.Signers = []transaction.Signer{{Account: sender0}} tx2.Attributes = []transaction.Attribute{{Type: transaction.HighPriority}} item2 := item{txn: tx2} tx3 := transaction.New([]byte{byte(opcode.PUSH1)}, 0) tx3.NetworkFee = new(big.Int).Div(balance, big.NewInt(2)).Int64() tx3.Signers = []transaction.Signer{{Account: sender0}} item3 := item{txn: tx3} tx4 := transaction.New([]byte{byte(opcode.PUSH1)}, 0) tx4.NetworkFee = new(big.Int).Div(balance, big.NewInt(4)).Int64() tx4.Signers = []transaction.Signer{{Account: sender0}} item4 := item{txn: tx4} require.True(t, item1.CompareTo(item2) > 0) require.True(t, item2.CompareTo(item1) < 0) require.True(t, item1.CompareTo(item3) > 0) require.True(t, item3.CompareTo(item1) < 0) require.True(t, item1.CompareTo(item4) > 0) require.True(t, item4.CompareTo(item1) < 0) require.True(t, item2.CompareTo(item3) > 0) require.True(t, item3.CompareTo(item2) < 0) require.True(t, item2.CompareTo(item4) > 0) require.True(t, item4.CompareTo(item2) < 0) require.True(t, item3.CompareTo(item4) > 0) require.True(t, item4.CompareTo(item3) < 0) } func TestMempoolAddRemoveOracleResponse(t *testing.T) { mp := New(3, 0, false) nonce := uint32(0) fs := &FeerStub{balance: 10000} newTx := func(netFee int64, id uint64) *transaction.Transaction { tx := transaction.New([]byte{byte(opcode.PUSH1)}, 0) tx.NetworkFee = netFee tx.Nonce = nonce nonce++ tx.Signers = []transaction.Signer{{Account: util.Uint160{1, 2, 3}}} tx.Attributes = []transaction.Attribute{{ Type: transaction.OracleResponseT, Value: &transaction.OracleResponse{ID: id}, }} // sanity check _, ok := mp.TryGetValue(tx.Hash()) require.False(t, ok) return tx } tx1 := newTx(10, 1) require.NoError(t, mp.Add(tx1, fs)) // smaller network fee tx2 := newTx(5, 1) err := mp.Add(tx2, fs) require.True(t, errors.Is(err, ErrOracleResponse)) // ok if old tx is removed mp.Remove(tx1.Hash(), fs) require.NoError(t, mp.Add(tx2, fs)) // higher network fee tx3 := newTx(6, 1) require.NoError(t, mp.Add(tx3, fs)) _, ok := mp.TryGetValue(tx2.Hash()) require.False(t, ok) _, ok = mp.TryGetValue(tx3.Hash()) require.True(t, ok) // another oracle response ID tx4 := newTx(4, 2) require.NoError(t, mp.Add(tx4, fs)) mp.RemoveStale(func(tx *transaction.Transaction) bool { return tx.Hash() != tx4.Hash() }, fs) // check that oracle id was removed. tx5 := newTx(3, 2) require.NoError(t, mp.Add(tx5, fs)) // another oracle response ID with high net fee tx6 := newTx(6, 3) require.NoError(t, mp.Add(tx6, fs)) // check respIds for _, i := range []uint64{1, 2, 3} { _, ok := mp.oracleResp[i] require.True(t, ok) } // reach capacity, check that response ID is removed together with tx5 tx7 := newTx(6, 4) require.NoError(t, mp.Add(tx7, fs)) for _, i := range []uint64{1, 4, 3} { _, ok := mp.oracleResp[i] require.True(t, ok) } } func TestMempoolAddRemoveConflicts(t *testing.T) { capacity := 6 mp := New(capacity, 0, false) var ( fs = &FeerStub{p2pSigExt: true, balance: 100000} nonce uint32 = 1 ) getConflictsTx := func(netFee int64, hashes ...util.Uint256) *transaction.Transaction { tx := transaction.New([]byte{byte(opcode.PUSH1)}, 0) tx.NetworkFee = netFee tx.Nonce = nonce nonce++ tx.Signers = []transaction.Signer{{Account: util.Uint160{1, 2, 3}}} tx.Attributes = make([]transaction.Attribute, len(hashes)) for i, h := range hashes { tx.Attributes[i] = transaction.Attribute{ Type: transaction.ConflictsT, Value: &transaction.Conflicts{ Hash: h, }, } } _, ok := mp.TryGetValue(tx.Hash()) require.Equal(t, false, ok) return tx } // tx1 in mempool and does not conflicts with anyone smallNetFee := int64(3) tx1 := getConflictsTx(smallNetFee) require.NoError(t, mp.Add(tx1, fs)) // tx2 conflicts with tx1 and has smaller netfee (Step 2, negative) tx2 := getConflictsTx(smallNetFee-1, tx1.Hash()) require.True(t, errors.Is(mp.Add(tx2, fs), ErrConflictsAttribute)) // tx3 conflicts with mempooled tx1 and has larger netfee => tx1 should be replaced by tx3 (Step 2, positive) tx3 := getConflictsTx(smallNetFee+1, tx1.Hash()) require.NoError(t, mp.Add(tx3, fs)) assert.Equal(t, 1, mp.Count()) assert.Equal(t, 1, len(mp.conflicts)) assert.Equal(t, []util.Uint256{tx3.Hash()}, mp.conflicts[tx1.Hash()]) // tx1 still does not conflicts with anyone, but tx3 is mempooled, conflicts with tx1 // and has larger netfee => tx1 shouldn't be added again (Step 1, negative) require.True(t, errors.Is(mp.Add(tx1, fs), ErrConflictsAttribute)) // tx2 can now safely be added because conflicting tx1 is not in mempool => we // cannot check that tx2 is signed by tx1.Sender require.NoError(t, mp.Add(tx2, fs)) assert.Equal(t, 1, len(mp.conflicts)) assert.Equal(t, []util.Uint256{tx3.Hash(), tx2.Hash()}, mp.conflicts[tx1.Hash()]) // mempooled tx4 conflicts with tx5, but tx4 has smaller netfee => tx4 should be replaced by tx5 (Step 1, positive) tx5 := getConflictsTx(smallNetFee + 1) tx4 := getConflictsTx(smallNetFee, tx5.Hash()) require.NoError(t, mp.Add(tx4, fs)) // unverified assert.Equal(t, 2, len(mp.conflicts)) assert.Equal(t, []util.Uint256{tx4.Hash()}, mp.conflicts[tx5.Hash()]) require.NoError(t, mp.Add(tx5, fs)) // tx5 does not conflict with anyone assert.Equal(t, 1, len(mp.conflicts)) // multiple conflicts in attributes of single transaction tx6 := getConflictsTx(smallNetFee) tx7 := getConflictsTx(smallNetFee) tx8 := getConflictsTx(smallNetFee) // need small network fee later tx9 := getConflictsTx(smallNetFee-2, tx6.Hash(), tx7.Hash(), tx8.Hash()) require.NoError(t, mp.Add(tx9, fs)) assert.Equal(t, 4, len(mp.conflicts)) assert.Equal(t, []util.Uint256{tx9.Hash()}, mp.conflicts[tx6.Hash()]) assert.Equal(t, []util.Uint256{tx9.Hash()}, mp.conflicts[tx7.Hash()]) assert.Equal(t, []util.Uint256{tx9.Hash()}, mp.conflicts[tx8.Hash()]) assert.Equal(t, []util.Uint256{tx3.Hash(), tx2.Hash()}, mp.conflicts[tx1.Hash()]) // multiple conflicts in attributes of multiple transactions tx10 := getConflictsTx(smallNetFee, tx6.Hash()) tx11 := getConflictsTx(smallNetFee, tx6.Hash()) require.NoError(t, mp.Add(tx10, fs)) // unverified, because tx6 is not in the pool require.NoError(t, mp.Add(tx11, fs)) // unverified, because tx6 is not in the pool assert.Equal(t, 4, len(mp.conflicts)) assert.Equal(t, []util.Uint256{tx9.Hash(), tx10.Hash(), tx11.Hash()}, mp.conflicts[tx6.Hash()]) assert.Equal(t, []util.Uint256{tx9.Hash()}, mp.conflicts[tx7.Hash()]) assert.Equal(t, []util.Uint256{tx9.Hash()}, mp.conflicts[tx8.Hash()]) assert.Equal(t, []util.Uint256{tx3.Hash(), tx2.Hash()}, mp.conflicts[tx1.Hash()]) // reach capacity, remove less prioritised tx9 with its multiple conflicts require.Equal(t, capacity, len(mp.verifiedTxes)) tx12 := getConflictsTx(smallNetFee + 2) require.NoError(t, mp.Add(tx12, fs)) assert.Equal(t, 2, len(mp.conflicts)) assert.Equal(t, []util.Uint256{tx10.Hash(), tx11.Hash()}, mp.conflicts[tx6.Hash()]) assert.Equal(t, []util.Uint256{tx3.Hash(), tx2.Hash()}, mp.conflicts[tx1.Hash()]) // manually remove tx11 with its single conflict mp.Remove(tx11.Hash(), fs) assert.Equal(t, 2, len(mp.conflicts)) assert.Equal(t, []util.Uint256{tx10.Hash()}, mp.conflicts[tx6.Hash()]) // manually remove last tx which conflicts with tx6 => mp.conflicts[tx6] should also be deleted mp.Remove(tx10.Hash(), fs) assert.Equal(t, 1, len(mp.conflicts)) assert.Equal(t, []util.Uint256{tx3.Hash(), tx2.Hash()}, mp.conflicts[tx1.Hash()]) // tx13 conflicts with tx2, but is not signed by tx2.Sender tx13 := transaction.New([]byte{byte(opcode.PUSH1)}, 0) tx13.NetworkFee = smallNetFee tx13.Nonce = uint32(random.Int(0, 1e4)) tx13.Signers = []transaction.Signer{{Account: util.Uint160{3, 2, 1}}} tx13.Attributes = []transaction.Attribute{{ Type: transaction.ConflictsT, Value: &transaction.Conflicts{ Hash: tx2.Hash(), }, }} _, ok := mp.TryGetValue(tx13.Hash()) require.Equal(t, false, ok) require.True(t, errors.Is(mp.Add(tx13, fs), ErrConflictsAttribute)) } func TestMempoolAddWithDataGetData(t *testing.T) { var ( smallNetFee int64 = 3 nonce uint32 ) fs := &FeerStub{ feePerByte: 0, p2pSigExt: true, blockHeight: 5, balance: 100, } mp := New(10, 1, false) newTx := func(t *testing.T, netFee int64) *transaction.Transaction { tx := transaction.New([]byte{byte(opcode.RET)}, 0) tx.Signers = []transaction.Signer{{}, {}} tx.NetworkFee = netFee nonce++ tx.Nonce = nonce return tx } // bad, insufficient deposit r1 := &payload.P2PNotaryRequest{ MainTransaction: newTx(t, 0), FallbackTransaction: newTx(t, fs.balance+1), } require.True(t, errors.Is(mp.Add(r1.FallbackTransaction, fs, r1), ErrInsufficientFunds)) // good r2 := &payload.P2PNotaryRequest{ MainTransaction: newTx(t, 0), FallbackTransaction: newTx(t, smallNetFee), } require.NoError(t, mp.Add(r2.FallbackTransaction, fs, r2)) require.True(t, mp.ContainsKey(r2.FallbackTransaction.Hash())) data, ok := mp.TryGetData(r2.FallbackTransaction.Hash()) require.True(t, ok) require.Equal(t, r2, data) // bad, already in pool require.True(t, errors.Is(mp.Add(r2.FallbackTransaction, fs, r2), ErrDup)) // good, higher priority than r2. The resulting mp.verifiedTxes: [r3, r2] r3 := &payload.P2PNotaryRequest{ MainTransaction: newTx(t, 0), FallbackTransaction: newTx(t, smallNetFee+1), } require.NoError(t, mp.Add(r3.FallbackTransaction, fs, r3)) require.True(t, mp.ContainsKey(r3.FallbackTransaction.Hash())) data, ok = mp.TryGetData(r3.FallbackTransaction.Hash()) require.True(t, ok) require.Equal(t, r3, data) // good, same priority as r2. The resulting mp.verifiedTxes: [r3, r2, r4] r4 := &payload.P2PNotaryRequest{ MainTransaction: newTx(t, 0), FallbackTransaction: newTx(t, smallNetFee), } require.NoError(t, mp.Add(r4.FallbackTransaction, fs, r4)) require.True(t, mp.ContainsKey(r4.FallbackTransaction.Hash())) data, ok = mp.TryGetData(r4.FallbackTransaction.Hash()) require.True(t, ok) require.Equal(t, r4, data) // good, same priority as r2. The resulting mp.verifiedTxes: [r3, r2, r4, r5] r5 := &payload.P2PNotaryRequest{ MainTransaction: newTx(t, 0), FallbackTransaction: newTx(t, smallNetFee), } require.NoError(t, mp.Add(r5.FallbackTransaction, fs, r5)) require.True(t, mp.ContainsKey(r5.FallbackTransaction.Hash())) data, ok = mp.TryGetData(r5.FallbackTransaction.Hash()) require.True(t, ok) require.Equal(t, r5, data) // and both r2's and r4's data should still be reachable data, ok = mp.TryGetData(r2.FallbackTransaction.Hash()) require.True(t, ok) require.Equal(t, r2, data) data, ok = mp.TryGetData(r4.FallbackTransaction.Hash()) require.True(t, ok) require.Equal(t, r4, data) // should fail to get unexisting data _, ok = mp.TryGetData(util.Uint256{0, 0, 0}) require.False(t, ok) // but getting nil data is OK. The resulting mp.verifiedTxes: [r3, r2, r4, r5, r6] r6 := newTx(t, smallNetFee) require.NoError(t, mp.Add(r6, fs, nil)) require.True(t, mp.ContainsKey(r6.Hash())) data, ok = mp.TryGetData(r6.Hash()) require.True(t, ok) require.Nil(t, data) // getting data: item is in verifiedMap, but not in verifiedTxes r7 := &payload.P2PNotaryRequest{ MainTransaction: newTx(t, 0), FallbackTransaction: newTx(t, smallNetFee), } require.NoError(t, mp.Add(r7.FallbackTransaction, fs, r4)) require.True(t, mp.ContainsKey(r7.FallbackTransaction.Hash())) r8 := &payload.P2PNotaryRequest{ MainTransaction: newTx(t, 0), FallbackTransaction: newTx(t, smallNetFee-1), } require.NoError(t, mp.Add(r8.FallbackTransaction, fs, r4)) require.True(t, mp.ContainsKey(r8.FallbackTransaction.Hash())) mp.verifiedTxes = append(mp.verifiedTxes[:len(mp.verifiedTxes)-2], mp.verifiedTxes[len(mp.verifiedTxes)-1]) _, ok = mp.TryGetData(r7.FallbackTransaction.Hash()) require.False(t, ok) }