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102 lines
3.1 KiB
C++
102 lines
3.1 KiB
C++
// Copyright (c) 2017-2021 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 <index/disktxpos.h>
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#include <node/blockstorage.h>
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#include <util/system.h>
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#include <validation.h>
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using node::OpenBlockFile;
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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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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(size_t n_cache_size, bool f_memory, bool f_wipe)
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: 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::WriteBlock(const CBlock& block, const CBlockIndex* pindex)
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{
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// Exclude genesis block transaction because outputs are not spendable.
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if (pindex->nHeight == 0) return true;
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CDiskTxPos pos{
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WITH_LOCK(::cs_main, return pindex->GetBlockPos()),
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GetSizeOfCompactSize(block.vtx.size())};
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std::vector<std::pair<uint256, CDiskTxPos>> vPos;
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vPos.reserve(block.vtx.size());
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for (const auto& tx : block.vtx) {
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vPos.emplace_back(tx->GetHash(), pos);
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pos.nTxOffset += ::GetSerializeSize(*tx, CLIENT_VERSION);
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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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CAutoFile file(OpenBlockFile(postx, true), SER_DISK, CLIENT_VERSION);
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if (file.IsNull()) {
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return error("%s: OpenBlockFile failed", __func__);
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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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if (fseek(file.Get(), postx.nTxOffset, SEEK_CUR)) {
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return error("%s: fseek(...) failed", __func__);
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}
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file >> tx;
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} catch (const std::exception& e) {
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return error("%s: Deserialize or I/O error - %s", __func__, e.what());
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}
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if (tx->GetHash() != tx_hash) {
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return error("%s: txid mismatch", __func__);
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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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