diff --git a/src/validation.cpp b/src/validation.cpp index 7750a97d2ff39..196d08193539a 100644 --- a/src/validation.cpp +++ b/src/validation.cpp @@ -622,18 +622,11 @@ class MemPoolAccept /** Iterators to mempool entries that this transaction directly conflicts with or may * replace via sibling eviction. */ CTxMemPool::setEntries m_iters_conflicting; - /** Iterators to all mempool entries that would be replaced by this transaction, including - * m_conflicts and their descendants. */ - CTxMemPool::setEntries m_all_conflicting; /** All mempool ancestors of this transaction. */ CTxMemPool::setEntries m_ancestors; /** Mempool entry constructed for this transaction. Constructed in PreChecks() but not * inserted into the mempool until Finalize(). */ std::unique_ptr m_entry; - /** Pointers to the transactions that have been removed from the mempool and replaced by - * this transaction (everything in m_all_conflicting), used to return to the MemPoolAccept caller. Only populated if - * validation is successful and the original transactions are removed. */ - std::list m_replaced_transactions; /** Whether RBF-related data structures (m_conflicts, m_iters_conflicting, m_all_conflicting, * m_replaced_transactions) include a sibling in addition to txns with conflicting inputs. */ bool m_sibling_eviction{false}; @@ -645,10 +638,6 @@ class MemPoolAccept CAmount m_base_fees; /** Base fees + any fee delta set by the user with prioritisetransaction. */ CAmount m_modified_fees; - /** Total modified fees of all transactions being replaced. */ - CAmount m_conflicting_fees{0}; - /** Total virtual size of all transactions being replaced. */ - size_t m_conflicting_size{0}; /** If we're doing package validation (i.e. m_package_feerates=true), the "effective" * package feerate of this transaction is the total fees divided by the total size of @@ -726,9 +715,39 @@ class MemPoolAccept Chainstate& m_active_chainstate; - /** Whether the transaction(s) would replace any mempool transactions and/or evict any siblings. - * If so, RBF rules apply. */ - bool m_rbf{false}; + // Fields below are per *sub*package state and must be reset prior to subsequent + // AcceptSingleTransaction and AcceptMultipleTransactions invocations + struct SubPackageState { + /** Aggregated modified fees of all transactions, used to calculate package feerate. */ + CAmount m_total_modified_fees{0}; + /** Aggregated virtual size of all transactions, used to calculate package feerate. */ + int64_t m_total_vsize{0}; + + // RBF-related members + /** Whether the transaction(s) would replace any mempool transactions and/or evict any siblings. + * If so, RBF rules apply. */ + bool m_rbf{false}; + /** All directly conflicting mempool transactions and their descendants. */ + CTxMemPool::setEntries m_all_conflicts; + /** Mempool transactions that were replaced. */ + std::list m_replaced_transactions; + + /** Total modified fees of mempool transactions being replaced. */ + CAmount m_conflicting_fees{0}; + /** Total size (in virtual bytes) of mempool transactions being replaced. */ + size_t m_conflicting_size{0}; + }; + + struct SubPackageState m_subpackage; + + /** Re-set sub-package state to not leak between evaluations */ + void ClearSubPackageState() EXCLUSIVE_LOCKS_REQUIRED(cs_main, m_pool.cs) + { + m_subpackage = SubPackageState{}; + + // And clean coins while at it + CleanupTemporaryCoins(); + } }; bool MemPoolAccept::PreChecks(ATMPArgs& args, Workspace& ws) @@ -1036,7 +1055,8 @@ bool MemPoolAccept::PreChecks(ATMPArgs& args, Workspace& ws) return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-spends-conflicting-tx", *err_string); } - m_rbf = !ws.m_conflicts.empty(); + // We want to detect conflicts in any tx in a package to trigger package RBF logic + m_subpackage.m_rbf |= !ws.m_conflicts.empty(); return true; } @@ -1068,24 +1088,25 @@ bool MemPoolAccept::ReplacementChecks(Workspace& ws) } // Calculate all conflicting entries and enforce Rule #5. - if (const auto err_string{GetEntriesForConflicts(tx, m_pool, ws.m_iters_conflicting, ws.m_all_conflicting)}) { + if (const auto err_string{GetEntriesForConflicts(tx, m_pool, ws.m_iters_conflicting, m_subpackage.m_all_conflicts)}) { return state.Invalid(TxValidationResult::TX_MEMPOOL_POLICY, strprintf("too many potential replacements%s", ws.m_sibling_eviction ? " (including sibling eviction)" : ""), *err_string); } // Enforce Rule #2. - if (const auto err_string{HasNoNewUnconfirmed(tx, m_pool, ws.m_iters_conflicting)}) { + if (const auto err_string{HasNoNewUnconfirmed(tx, m_pool, m_subpackage.m_all_conflicts)}) { // Sibling eviction is only done for v3 transactions, which cannot have multiple ancestors. Assume(!ws.m_sibling_eviction); return state.Invalid(TxValidationResult::TX_MEMPOOL_POLICY, strprintf("replacement-adds-unconfirmed%s", ws.m_sibling_eviction ? " (including sibling eviction)" : ""), *err_string); } + // Check if it's economically rational to mine this transaction rather than the ones it // replaces and pays for its own relay fees. Enforce Rules #3 and #4. - for (CTxMemPool::txiter it : ws.m_all_conflicting) { - ws.m_conflicting_fees += it->GetModifiedFee(); - ws.m_conflicting_size += it->GetTxSize(); + for (CTxMemPool::txiter it : m_subpackage.m_all_conflicts) { + m_subpackage.m_conflicting_fees += it->GetModifiedFee(); + m_subpackage.m_conflicting_size += it->GetTxSize(); } - if (const auto err_string{PaysForRBF(ws.m_conflicting_fees, ws.m_modified_fees, ws.m_vsize, + if (const auto err_string{PaysForRBF(m_subpackage.m_conflicting_fees, ws.m_modified_fees, ws.m_vsize, m_pool.m_opts.incremental_relay_feerate, hash)}) { // Even though this is a fee-related failure, this result is TX_MEMPOOL_POLICY, not // TX_RECONSIDERABLE, because it cannot be bypassed using package validation. @@ -1184,19 +1205,18 @@ bool MemPoolAccept::Finalize(const ATMPArgs& args, Workspace& ws) const uint256& hash = ws.m_hash; TxValidationState& state = ws.m_state; const bool bypass_limits = args.m_bypass_limits; - std::unique_ptr& entry = ws.m_entry; // Remove conflicting transactions from the mempool - for (CTxMemPool::txiter it : ws.m_all_conflicting) + for (CTxMemPool::txiter it : m_subpackage.m_all_conflicts) { LogPrint(BCLog::MEMPOOL, "replacing tx %s (wtxid=%s) with %s (wtxid=%s) for %s additional fees, %d delta bytes\n", it->GetTx().GetHash().ToString(), it->GetTx().GetWitnessHash().ToString(), hash.ToString(), tx.GetWitnessHash().ToString(), - FormatMoney(ws.m_modified_fees - ws.m_conflicting_fees), - (int)entry->GetTxSize() - (int)ws.m_conflicting_size); + FormatMoney(ws.m_modified_fees - m_subpackage.m_conflicting_fees), + (int)entry->GetTxSize() - (int)m_subpackage.m_conflicting_size); TRACE7(mempool, replaced, it->GetTx().GetHash().data(), it->GetTxSize(), @@ -1206,9 +1226,12 @@ bool MemPoolAccept::Finalize(const ATMPArgs& args, Workspace& ws) entry->GetTxSize(), entry->GetFee() ); - ws.m_replaced_transactions.push_back(it->GetSharedTx()); + m_subpackage.m_replaced_transactions.push_back(it->GetSharedTx()); } - m_pool.RemoveStaged(ws.m_all_conflicting, false, MemPoolRemovalReason::REPLACED); + m_pool.RemoveStaged(m_subpackage.m_all_conflicts, false, MemPoolRemovalReason::REPLACED); + // Don't attempt to process the same conflicts repeatedly during subpackage evaluation: + // they no longer exist on subsequent calls to Finalize() post-RemoveStaged + m_subpackage.m_all_conflicts.clear(); // Store transaction in memory m_pool.addUnchecked(*entry, ws.m_ancestors); @@ -1294,7 +1317,7 @@ bool MemPoolAccept::SubmitPackage(const ATMPArgs& args, std::vector& const auto effective_feerate_wtxids = args.m_package_feerates ? all_package_wtxids : std::vector{ws.m_ptx->GetWitnessHash()}; results.emplace(ws.m_ptx->GetWitnessHash(), - MempoolAcceptResult::Success(std::move(ws.m_replaced_transactions), ws.m_vsize, + MempoolAcceptResult::Success(std::move(m_subpackage.m_replaced_transactions), ws.m_vsize, ws.m_base_fees, effective_feerate, effective_feerate_wtxids)); if (!m_pool.m_opts.signals) continue; const CTransaction& tx = *ws.m_ptx; @@ -1330,7 +1353,7 @@ MempoolAcceptResult MemPoolAccept::AcceptSingleTransaction(const CTransactionRef return MempoolAcceptResult::Failure(ws.m_state); } - if (m_rbf && !ReplacementChecks(ws)) return MempoolAcceptResult::Failure(ws.m_state); + if (m_subpackage.m_rbf && !ReplacementChecks(ws)) return MempoolAcceptResult::Failure(ws.m_state); // Perform the inexpensive checks first and avoid hashing and signature verification unless // those checks pass, to mitigate CPU exhaustion denial-of-service attacks. @@ -1341,7 +1364,7 @@ MempoolAcceptResult MemPoolAccept::AcceptSingleTransaction(const CTransactionRef const CFeeRate effective_feerate{ws.m_modified_fees, static_cast(ws.m_vsize)}; // Tx was accepted, but not added if (args.m_test_accept) { - return MempoolAcceptResult::Success(std::move(ws.m_replaced_transactions), ws.m_vsize, + return MempoolAcceptResult::Success(std::move(m_subpackage.m_replaced_transactions), ws.m_vsize, ws.m_base_fees, effective_feerate, single_wtxid); } @@ -1362,7 +1385,7 @@ MempoolAcceptResult MemPoolAccept::AcceptSingleTransaction(const CTransactionRef m_pool.m_opts.signals->TransactionAddedToMempool(tx_info, m_pool.GetAndIncrementSequence()); } - return MempoolAcceptResult::Success(std::move(ws.m_replaced_transactions), ws.m_vsize, ws.m_base_fees, + return MempoolAcceptResult::Success(std::move(m_subpackage.m_replaced_transactions), ws.m_vsize, ws.m_base_fees, effective_feerate, single_wtxid); } @@ -1407,6 +1430,7 @@ PackageMempoolAcceptResult MemPoolAccept::AcceptMultipleTransactions(const std:: // replacements, we don't need to track the coins spent. Note that this logic will need to be // updated if package replace-by-fee is allowed in the future. assert(!args.m_allow_replacement); + assert(!m_subpackage.m_rbf); m_viewmempool.PackageAddTransaction(ws.m_ptx); } @@ -1428,26 +1452,26 @@ PackageMempoolAcceptResult MemPoolAccept::AcceptMultipleTransactions(const std:: // a child that is below mempool minimum feerate. To avoid these behaviors, callers of // AcceptMultipleTransactions need to restrict txns topology (e.g. to ancestor sets) and check // the feerates of individuals and subsets. - const auto m_total_vsize = std::accumulate(workspaces.cbegin(), workspaces.cend(), int64_t{0}, + m_subpackage.m_total_vsize = std::accumulate(workspaces.cbegin(), workspaces.cend(), int64_t{0}, [](int64_t sum, auto& ws) { return sum + ws.m_vsize; }); - const auto m_total_modified_fees = std::accumulate(workspaces.cbegin(), workspaces.cend(), CAmount{0}, + m_subpackage.m_total_modified_fees = std::accumulate(workspaces.cbegin(), workspaces.cend(), CAmount{0}, [](CAmount sum, auto& ws) { return sum + ws.m_modified_fees; }); - const CFeeRate package_feerate(m_total_modified_fees, m_total_vsize); + const CFeeRate package_feerate(m_subpackage.m_total_modified_fees, m_subpackage.m_total_vsize); std::vector all_package_wtxids; all_package_wtxids.reserve(workspaces.size()); std::transform(workspaces.cbegin(), workspaces.cend(), std::back_inserter(all_package_wtxids), [](const auto& ws) { return ws.m_ptx->GetWitnessHash(); }); TxValidationState placeholder_state; if (args.m_package_feerates && - !CheckFeeRate(m_total_vsize, m_total_modified_fees, placeholder_state)) { + !CheckFeeRate(m_subpackage.m_total_vsize, m_subpackage.m_total_modified_fees, placeholder_state)) { package_state.Invalid(PackageValidationResult::PCKG_TX, "transaction failed"); return PackageMempoolAcceptResult(package_state, {{workspaces.back().m_ptx->GetWitnessHash(), - MempoolAcceptResult::FeeFailure(placeholder_state, CFeeRate(m_total_modified_fees, m_total_vsize), all_package_wtxids)}}); + MempoolAcceptResult::FeeFailure(placeholder_state, CFeeRate(m_subpackage.m_total_modified_fees, m_subpackage.m_total_vsize), all_package_wtxids)}}); } // Apply package mempool ancestor/descendant limits. Skip if there is only one transaction, // because it's unnecessary. - if (txns.size() > 1 && !PackageMempoolChecks(txns, m_total_vsize, package_state)) { + if (txns.size() > 1 && !PackageMempoolChecks(txns, m_subpackage.m_total_vsize, package_state)) { return PackageMempoolAcceptResult(package_state, std::move(results)); } @@ -1465,7 +1489,7 @@ PackageMempoolAcceptResult MemPoolAccept::AcceptMultipleTransactions(const std:: const auto effective_feerate_wtxids = args.m_package_feerates ? all_package_wtxids : std::vector{ws.m_ptx->GetWitnessHash()}; results.emplace(ws.m_ptx->GetWitnessHash(), - MempoolAcceptResult::Success(std::move(ws.m_replaced_transactions), + MempoolAcceptResult::Success(std::move(m_subpackage.m_replaced_transactions), ws.m_vsize, ws.m_base_fees, effective_feerate, effective_feerate_wtxids)); } @@ -1530,7 +1554,8 @@ PackageMempoolAcceptResult MemPoolAccept::AcceptSubPackage(const std::vector