1  // Copyright (c) 2025-present The Bitcoin Core developers
  2  // Distributed under the MIT software license, see the accompanying
  3  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  4  
  5  #include <bench/bench.h>
  6  #include <blockencodings.h>
  7  #include <consensus/amount.h>
  8  #include <kernel/cs_main.h>
  9  #include <net_processing.h>
 10  #include <primitives/transaction.h>
 11  #include <script/script.h>
 12  #include <sync.h>
 13  #include <test/util/setup_common.h>
 14  #include <test/util/txmempool.h>
 15  #include <txmempool.h>
 16  #include <util/check.h>
 17  
 18  #include <memory>
 19  #include <vector>
 20  
 21  
 22  static void AddTx(const CTransactionRef& tx, const CAmount& fee, CTxMemPool& pool) EXCLUSIVE_LOCKS_REQUIRED(cs_main, pool.cs)
 23  {
 24      LockPoints lp;
 25      TryAddToMempool(pool, CTxMemPoolEntry(tx, fee, /*time=*/0, /*entry_height=*/1, /*entry_sequence=*/0, /*spends_coinbase=*/false, /*sigops_cost=*/4, lp));
 26  }
 27  
 28  namespace {
 29  class BenchCBHAST : public CBlockHeaderAndShortTxIDs
 30  {
 31  private:
 32      static CBlock DummyBlock()
 33      {
 34          CBlock block;
 35          block.nVersion = 5;
 36          block.hashPrevBlock.SetNull();
 37          block.hashMerkleRoot.SetNull();
 38          block.nTime = 1231006505;
 39          block.nBits = 0x1d00ffff;
 40          block.nNonce = 2083236893;
 41          block.fChecked = false;
 42          CMutableTransaction tx;
 43          tx.vin.resize(1);
 44          tx.vout.resize(1);
 45          block.vtx.emplace_back(MakeTransactionRef(tx)); // dummy coinbase
 46          return block;
 47      }
 48  
 49  public:
 50      BenchCBHAST(InsecureRandomContext& rng, int txs) : CBlockHeaderAndShortTxIDs(DummyBlock(), rng.rand64())
 51      {
 52          shorttxids.reserve(txs);
 53          while (txs-- > 0) {
 54              shorttxids.push_back(rng.randbits<SHORTTXIDS_LENGTH*8>());
 55          }
 56      }
 57  };
 58  } // anon namespace
 59  
 60  static void BlockEncodingBench(benchmark::Bench& bench, size_t n_pool, size_t n_extra)
 61  {
 62      const auto testing_setup = MakeNoLogFileContext<const ChainTestingSetup>(ChainType::MAIN);
 63      CTxMemPool& pool = *Assert(testing_setup->m_node.mempool);
 64      InsecureRandomContext rng(11);
 65  
 66      LOCK2(cs_main, pool.cs);
 67  
 68      std::vector<std::pair<Wtxid, CTransactionRef>> extratxn;
 69      extratxn.reserve(n_extra);
 70  
 71      // bump up the size of txs
 72      std::array<std::byte,200> sigspam;
 73      sigspam.fill(std::byte(42));
 74  
 75      // a reasonably large mempool of 50k txs, ~10MB total
 76      std::vector<CTransactionRef> refs;
 77      refs.reserve(n_pool + n_extra);
 78      for (size_t i = 0; i < n_pool + n_extra; ++i) {
 79          CMutableTransaction tx = CMutableTransaction();
 80          tx.vin.resize(1);
 81          tx.vin[0].scriptSig = CScript() << sigspam;
 82          tx.vin[0].scriptWitness.stack.push_back({1});
 83          tx.vout.resize(1);
 84          tx.vout[0].scriptPubKey = CScript() << OP_1 << OP_EQUAL;
 85          tx.vout[0].nValue = i;
 86          refs.push_back(MakeTransactionRef(tx));
 87      }
 88  
 89      // ensure mempool ordering is different to memory ordering of transactions,
 90      // to simulate a mempool that has changed over time
 91      std::shuffle(refs.begin(), refs.end(), rng);
 92  
 93      for (size_t i = 0; i < n_pool; ++i) {
 94          AddTx(refs[i], /*fee=*/refs[i]->vout[0].nValue, pool);
 95      }
 96      for (size_t i = n_pool; i < n_pool + n_extra; ++i) {
 97          extratxn.emplace_back(refs[i]->GetWitnessHash(), refs[i]);
 98      }
 99  
100      BenchCBHAST cmpctblock{rng, 3000};
101  
102      bench.run([&] {
103          PartiallyDownloadedBlock pdb{&pool};
104          auto res = pdb.InitData(cmpctblock, extratxn);
105  
106          // if there were duplicates the benchmark will be invalid
107          // (eg, extra txns will be skipped) and we will receive
108          // READ_STATUS_FAILED
109          assert(res == READ_STATUS_OK);
110      });
111  }
112  
113  static void BlockEncodingNoExtra(benchmark::Bench& bench)
114  {
115      BlockEncodingBench(bench, 50000, 0);
116  }
117  
118  static void BlockEncodingStdExtra(benchmark::Bench& bench)
119  {
120      static_assert(DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN == 100);
121      BlockEncodingBench(bench, 50000, 100);
122  }
123  
124  static void BlockEncodingLargeExtra(benchmark::Bench& bench)
125  {
126      BlockEncodingBench(bench, 50000, 5000);
127  }
128  
129  BENCHMARK(BlockEncodingNoExtra);
130  BENCHMARK(BlockEncodingStdExtra);
131  BENCHMARK(BlockEncodingLargeExtra);