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103 lines
3.2 KiB
C++
103 lines
3.2 KiB
C++
// Copyright (c) 2017-2022 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <index/txindex.h>
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#include <clientversion.h>
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#include <common/args.h>
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#include <index/disktxpos.h>
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#include <logging.h>
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#include <node/blockstorage.h>
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#include <validation.h>
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constexpr uint8_t DB_TXINDEX{'t'};
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std::unique_ptr<TxIndex> g_txindex;
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/** Access to the txindex database (indexes/txindex/) */
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class TxIndex::DB : public BaseIndex::DB
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{
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public:
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explicit DB(size_t n_cache_size, bool f_memory = false, bool f_wipe = false);
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/// Read the disk location of the transaction data with the given hash. Returns false if the
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/// transaction hash is not indexed.
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bool ReadTxPos(const uint256& txid, CDiskTxPos& pos) const;
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/// Write a batch of transaction positions to the DB.
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[[nodiscard]] bool WriteTxs(const std::vector<std::pair<uint256, CDiskTxPos>>& v_pos);
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};
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TxIndex::DB::DB(size_t n_cache_size, bool f_memory, bool f_wipe) :
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BaseIndex::DB(gArgs.GetDataDirNet() / "indexes" / "txindex", n_cache_size, f_memory, f_wipe)
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{}
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bool TxIndex::DB::ReadTxPos(const uint256 &txid, CDiskTxPos& pos) const
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{
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return Read(std::make_pair(DB_TXINDEX, txid), pos);
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}
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bool TxIndex::DB::WriteTxs(const std::vector<std::pair<uint256, CDiskTxPos>>& v_pos)
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{
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CDBBatch batch(*this);
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for (const auto& tuple : v_pos) {
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batch.Write(std::make_pair(DB_TXINDEX, tuple.first), tuple.second);
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}
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return WriteBatch(batch);
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}
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TxIndex::TxIndex(std::unique_ptr<interfaces::Chain> chain, size_t n_cache_size, bool f_memory, bool f_wipe)
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: BaseIndex(std::move(chain), "txindex"), m_db(std::make_unique<TxIndex::DB>(n_cache_size, f_memory, f_wipe))
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{}
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TxIndex::~TxIndex() = default;
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bool TxIndex::CustomAppend(const interfaces::BlockInfo& block)
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{
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// Exclude genesis block transaction because outputs are not spendable.
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if (block.height == 0) return true;
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assert(block.data);
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CDiskTxPos pos({block.file_number, block.data_pos}, GetSizeOfCompactSize(block.data->vtx.size()));
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std::vector<std::pair<uint256, CDiskTxPos>> vPos;
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vPos.reserve(block.data->vtx.size());
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for (const auto& tx : block.data->vtx) {
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vPos.emplace_back(tx->GetHash(), pos);
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pos.nTxOffset += ::GetSerializeSize(TX_WITH_WITNESS(*tx));
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}
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return m_db->WriteTxs(vPos);
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}
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BaseIndex::DB& TxIndex::GetDB() const { return *m_db; }
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bool TxIndex::FindTx(const uint256& tx_hash, uint256& block_hash, CTransactionRef& tx) const
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{
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CDiskTxPos postx;
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if (!m_db->ReadTxPos(tx_hash, postx)) {
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return false;
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}
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AutoFile file{m_chainstate->m_blockman.OpenBlockFile(postx, true)};
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if (file.IsNull()) {
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LogError("%s: OpenBlockFile failed\n", __func__);
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return false;
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}
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CBlockHeader header;
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try {
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file >> header;
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file.seek(postx.nTxOffset, SEEK_CUR);
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file >> TX_WITH_WITNESS(tx);
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} catch (const std::exception& e) {
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LogError("%s: Deserialize or I/O error - %s\n", __func__, e.what());
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return false;
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}
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if (tx->GetHash() != tx_hash) {
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LogError("%s: txid mismatch\n", __func__);
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return false;
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}
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block_hash = header.GetHash();
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return true;
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}
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