txindex.cpp raw

   1  // Copyright (c) 2017-2022 The Limenka 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 <index/txindex.h>
   6  
   7  #include <clientversion.h>
   8  #include <common/args.h>
   9  #include <index/disktxpos.h>
  10  #include <logging.h>
  11  #include <node/blockstorage.h>
  12  #include <validation.h>
  13  
  14  constexpr uint8_t DB_TXINDEX{'t'};
  15  
  16  std::unique_ptr<TxIndex> g_txindex;
  17  
  18  
  19  /** Access to the txindex database (indexes/txindex/) */
  20  class TxIndex::DB : public BaseIndex::DB
  21  {
  22  public:
  23      explicit DB(size_t n_cache_size, bool f_memory = false, bool f_wipe = false);
  24  
  25      /// Read the disk location of the transaction data with the given hash. Returns false if the
  26      /// transaction hash is not indexed.
  27      bool ReadTxPos(const uint256& txid, CDiskTxPos& pos) const;
  28  
  29      /// Write a batch of transaction positions to the DB.
  30      [[nodiscard]] bool WriteTxs(const std::vector<std::pair<uint256, CDiskTxPos>>& v_pos);
  31  };
  32  
  33  TxIndex::DB::DB(size_t n_cache_size, bool f_memory, bool f_wipe) :
  34      BaseIndex::DB(gArgs.GetDataDirNet() / "indexes" / "txindex", n_cache_size, f_memory, f_wipe)
  35  {}
  36  
  37  bool TxIndex::DB::ReadTxPos(const uint256 &txid, CDiskTxPos& pos) const
  38  {
  39      return Read(std::make_pair(DB_TXINDEX, txid), pos);
  40  }
  41  
  42  bool TxIndex::DB::WriteTxs(const std::vector<std::pair<uint256, CDiskTxPos>>& v_pos)
  43  {
  44      CDBBatch batch(*this);
  45      for (const auto& tuple : v_pos) {
  46          batch.Write(std::make_pair(DB_TXINDEX, tuple.first), tuple.second);
  47      }
  48      return WriteBatch(batch);
  49  }
  50  
  51  TxIndex::TxIndex(std::unique_ptr<interfaces::Chain> chain, size_t n_cache_size, bool f_memory, bool f_wipe)
  52      : BaseIndex(std::move(chain), "txindex"), m_db(std::make_unique<TxIndex::DB>(n_cache_size, f_memory, f_wipe))
  53  {}
  54  
  55  TxIndex::~TxIndex() = default;
  56  
  57  bool TxIndex::CustomAppend(const interfaces::BlockInfo& block)
  58  {
  59      // Exclude genesis block transaction because outputs are not spendable.
  60      if (block.height == 0) return true;
  61  
  62      assert(block.data);
  63      CDiskTxPos pos({block.file_number, block.data_pos}, GetSizeOfCompactSize(block.data->vtx.size()));
  64      std::vector<std::pair<uint256, CDiskTxPos>> vPos;
  65      vPos.reserve(block.data->vtx.size());
  66      for (const auto& tx : block.data->vtx) {
  67          vPos.emplace_back(tx->GetHash(), pos);
  68          pos.nTxOffset += ::GetSerializeSize(TX_WITH_WITNESS(*tx));
  69      }
  70      return m_db->WriteTxs(vPos);
  71  }
  72  
  73  BaseIndex::DB& TxIndex::GetDB() const { return *m_db; }
  74  
  75  bool TxIndex::FindTx(const uint256& tx_hash, uint256& block_hash, CTransactionRef& tx) const
  76  {
  77      CDiskTxPos postx;
  78      if (!m_db->ReadTxPos(tx_hash, postx)) {
  79          return false;
  80      }
  81  
  82      AutoFile file{m_chainstate->m_blockman.OpenBlockFile(postx, true)};
  83      if (file.IsNull()) {
  84          LogError("%s: OpenBlockFile failed\n", __func__);
  85          return false;
  86      }
  87      CBlockHeader header;
  88      try {
  89          file >> header;
  90          file.seek(postx.nTxOffset, SEEK_CUR);
  91          file >> TX_WITH_WITNESS(tx);
  92      } catch (const std::exception& e) {
  93          LogError("%s: Deserialize or I/O error - %s\n", __func__, e.what());
  94          return false;
  95      }
  96      if (tx->GetHash() != tx_hash) {
  97          LogError("%s: txid mismatch\n", __func__);
  98          return false;
  99      }
 100      block_hash = header.GetHash();
 101      return true;
 102  }
 103