Merge fafaad5edc into 66aa6a47bd

7c123c08dd  miner: add package feerate vector to CBlockTemplate (ismaelsadeeq)

Pull request description:

  This PR enables `BlockAssembler` to add all selected packages' fee and virtual size to a vector, and then return the vector as a member of `CBlockTemplate` struct.

  This PR is the first step in the https://github.com/bitcoin/bitcoin/issues/30392 project.

  The packages' vsize and fee are used in #30157 to select a percentile fee rate of the top block in the mempool.

ACKs for top commit:
  rkrux:
    tACK 7c123c08dd
  ryanofsky:
    Code review ACK 7c123c08dd. Changes since last review are rebasing due to a test conflict, giving the new field a better name and description, resolving the test conflict, and renaming a lot of test variables. The actual code change is still one-line change.
  glozow:
    reACK 7c123c08dd

Tree-SHA512: 767b0b3d4273cf1589fd2068d729a66c7414c0f9574b15989fbe293f8c85cd6c641dd783cde55bfabab32cd047d7d8a071d6897b06ed4295c0d071e588de0861

src/node/miner.cpp

@@ -421,6 +421,7 @@ void BlockAssembler::addPackageTxs(int& nPackagesSelected, int& nDescendantsUpda
         }
 
         ++nPackagesSelected;
+        pblocktemplate->m_package_feerates.emplace_back(packageFees, static_cast<int32_t>(packageSize));
 
         // Update transactions that depend on each of these
         nDescendantsUpdated += UpdatePackagesForAdded(mempool, ancestors, mapModifiedTx);

src/node/miner.h

@@ -10,6 +10,7 @@
 #include <policy/policy.h>
 #include <primitives/block.h>
 #include <txmempool.h>
+#include <util/feefrac.h>
 
 #include <memory>
 #include <optional>
@@ -39,6 +40,9 @@ struct CBlockTemplate
     std::vector<CAmount> vTxFees;
     std::vector<int64_t> vTxSigOpsCost;
     std::vector<unsigned char> vchCoinbaseCommitment;
+    /* A vector of package fee rates, ordered by the sequence in which
+     * packages are selected for inclusion in the block template.*/
+    std::vector<FeeFrac> m_package_feerates;
 };
 
 // Container for tracking updates to ancestor feerate as we include (parent)

src/test/fuzz/package_eval.cpp

@@ -1,4 +1,4 @@
-// Copyright (c) 2023 The Bitcoin Core developers
+// Copyright (c) 2023-present The Bitcoin Core developers
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
@@ -57,9 +57,9 @@ void initialize_tx_pool()
 }
 
 struct OutpointsUpdater final : public CValidationInterface {
-    std::set<COutPoint>& m_mempool_outpoints;
+    std::unordered_set<COutPoint, SaltedOutpointHasher>& m_mempool_outpoints;
 
-    explicit OutpointsUpdater(std::set<COutPoint>& r)
+    explicit OutpointsUpdater(std::unordered_set<COutPoint, SaltedOutpointHasher>& r)
         : m_mempool_outpoints{r} {}
 
     void TransactionAddedToMempool(const NewMempoolTransactionInfo& tx, uint64_t /* mempool_sequence */) override
@@ -200,8 +200,8 @@ FUZZ_TARGET(ephemeral_package_eval, .init = initialize_tx_pool)
     MockTime(fuzzed_data_provider, chainstate);
 
     // All RBF-spendable outpoints outside of the unsubmitted package
-    std::set<COutPoint> mempool_outpoints;
-    std::map<COutPoint, CAmount> outpoints_value;
+    std::unordered_set<COutPoint, SaltedOutpointHasher> mempool_outpoints;
+    std::unordered_map<COutPoint, CAmount, SaltedOutpointHasher> outpoints_value;
     for (const auto& outpoint : g_outpoints_coinbase_init_mature) {
         Assert(mempool_outpoints.insert(outpoint).second);
         outpoints_value[outpoint] = 50 * COIN;
@@ -225,9 +225,9 @@ FUZZ_TARGET(ephemeral_package_eval, .init = initialize_tx_pool)
         std::optional<COutPoint> outpoint_to_rbf{fuzzed_data_provider.ConsumeBool() ? GetChildEvictingPrevout(tx_pool) : std::nullopt};
 
         // Make small packages
-        const auto num_txs = outpoint_to_rbf ? 1 : (size_t) fuzzed_data_provider.ConsumeIntegralInRange<int>(1, 4);
+        const auto num_txs = outpoint_to_rbf ? 1 : fuzzed_data_provider.ConsumeIntegralInRange<size_t>(1, 4);
 
-        std::set<COutPoint> package_outpoints;
+        std::unordered_set<COutPoint, SaltedOutpointHasher> package_outpoints;
         while (txs.size() < num_txs) {
             // Create transaction to add to the mempool
             txs.emplace_back([&] {
@@ -355,8 +355,8 @@ FUZZ_TARGET(tx_package_eval, .init = initialize_tx_pool)
     MockTime(fuzzed_data_provider, chainstate);
 
     // All RBF-spendable outpoints outside of the unsubmitted package
-    std::set<COutPoint> mempool_outpoints;
-    std::map<COutPoint, CAmount> outpoints_value;
+    std::unordered_set<COutPoint, SaltedOutpointHasher> mempool_outpoints;
+    std::unordered_map<COutPoint, CAmount, SaltedOutpointHasher> outpoints_value;
     for (const auto& outpoint : g_outpoints_coinbase_init_mature) {
         Assert(mempool_outpoints.insert(outpoint).second);
         outpoints_value[outpoint] = 50 * COIN;
@@ -377,8 +377,8 @@ FUZZ_TARGET(tx_package_eval, .init = initialize_tx_pool)
         std::vector<CTransactionRef> txs;
 
         // Make packages of 1-to-26 transactions
-        const auto num_txs = (size_t) fuzzed_data_provider.ConsumeIntegralInRange<int>(1, 26);
-        std::set<COutPoint> package_outpoints;
+        const auto num_txs = fuzzed_data_provider.ConsumeIntegralInRange<size_t>(1, 26);
+        std::unordered_set<COutPoint, SaltedOutpointHasher> package_outpoints;
         while (txs.size() < num_txs) {
             // Create transaction to add to the mempool
             txs.emplace_back([&] {

src/test/miner_tests.cpp

@@ -16,6 +16,7 @@
 #include <txmempool.h>
 #include <uint256.h>
 #include <util/check.h>
+#include <util/feefrac.h>
 #include <util/strencodings.h>
 #include <util/time.h>
 #include <util/translation.h>
@@ -25,6 +26,7 @@
 #include <test/util/setup_common.h>
 
 #include <memory>
+#include <vector>
 
 #include <boost/test/unit_test.hpp>
 
@@ -123,19 +125,22 @@ void MinerTestingSetup::TestPackageSelection(const CScript& scriptPubKey, const
     tx.vout[0].nValue = 5000000000LL - 1000;
     // This tx has a low fee: 1000 satoshis
     Txid hashParentTx = tx.GetHash(); // save this txid for later use
-    AddToMempool(tx_mempool, entry.Fee(1000).Time(Now<NodeSeconds>()).SpendsCoinbase(true).FromTx(tx));
+    const auto parent_tx{entry.Fee(1000).Time(Now<NodeSeconds>()).SpendsCoinbase(true).FromTx(tx)};
+    AddToMempool(tx_mempool, parent_tx);
 
     // This tx has a medium fee: 10000 satoshis
     tx.vin[0].prevout.hash = txFirst[1]->GetHash();
     tx.vout[0].nValue = 5000000000LL - 10000;
     Txid hashMediumFeeTx = tx.GetHash();
-    AddToMempool(tx_mempool, entry.Fee(10000).Time(Now<NodeSeconds>()).SpendsCoinbase(true).FromTx(tx));
+    const auto medium_fee_tx{entry.Fee(10000).Time(Now<NodeSeconds>()).SpendsCoinbase(true).FromTx(tx)};
+    AddToMempool(tx_mempool, medium_fee_tx);
 
     // This tx has a high fee, but depends on the first transaction
     tx.vin[0].prevout.hash = hashParentTx;
     tx.vout[0].nValue = 5000000000LL - 1000 - 50000; // 50k satoshi fee
     Txid hashHighFeeTx = tx.GetHash();
-    AddToMempool(tx_mempool, entry.Fee(50000).Time(Now<NodeSeconds>()).SpendsCoinbase(false).FromTx(tx));
+    const auto high_fee_tx{entry.Fee(50000).Time(Now<NodeSeconds>()).SpendsCoinbase(false).FromTx(tx)};
+    AddToMempool(tx_mempool, high_fee_tx);
 
     std::unique_ptr<BlockTemplate> block_template = mining->createNewBlock(options);
     BOOST_REQUIRE(block_template);
@@ -145,6 +150,21 @@ void MinerTestingSetup::TestPackageSelection(const CScript& scriptPubKey, const
     BOOST_CHECK(block.vtx[2]->GetHash() == hashHighFeeTx);
     BOOST_CHECK(block.vtx[3]->GetHash() == hashMediumFeeTx);
 
+    // Test the inclusion of package feerates in the block template and ensure they are sequential.
+    const auto block_package_feerates = BlockAssembler{m_node.chainman->ActiveChainstate(), &tx_mempool, options}.CreateNewBlock()->m_package_feerates;
+    BOOST_CHECK(block_package_feerates.size() == 2);
+
+    // parent_tx and high_fee_tx are added to the block as a package.
+    const auto combined_txs_fee = parent_tx.GetFee() + high_fee_tx.GetFee();
+    const auto combined_txs_size = parent_tx.GetTxSize() + high_fee_tx.GetTxSize();
+    FeeFrac package_feefrac{combined_txs_fee, combined_txs_size};
+    // The package should be added first.
+    BOOST_CHECK(block_package_feerates[0] == package_feefrac);
+
+    // The medium_fee_tx should be added next.
+    FeeFrac medium_tx_feefrac{medium_fee_tx.GetFee(), medium_fee_tx.GetTxSize()};
+    BOOST_CHECK(block_package_feerates[1] == medium_tx_feefrac);
+
     // Test that a package below the block min tx fee doesn't get included
     tx.vin[0].prevout.hash = hashHighFeeTx;
     tx.vout[0].nValue = 5000000000LL - 1000 - 50000; // 0 fee