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// Copyright (c) 2017-2021 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <index/txindex.h>
#include <index/disktxpos.h>
#include <node/blockstorage.h>
#include <util/system.h>
#include <validation.h>
using node::OpenBlockFile;
constexpr uint8_t DB_TXINDEX{'t'};
std::unique_ptr<TxIndex> g_txindex;
/** Access to the txindex database (indexes/txindex/) */
class TxIndex::DB : public BaseIndex::DB
{
public:
explicit DB(size_t n_cache_size, bool f_memory = false, bool f_wipe = false);
/// Read the disk location of the transaction data with the given hash. Returns false if the
/// transaction hash is not indexed.
bool ReadTxPos(const uint256& txid, CDiskTxPos& pos) const;
/// Write a batch of transaction positions to the DB.
bool WriteTxs(const std::vector<std::pair<uint256, CDiskTxPos>>& v_pos);
};
TxIndex::DB::DB(size_t n_cache_size, bool f_memory, bool f_wipe) :
BaseIndex::DB(gArgs.GetDataDirNet() / "indexes" / "txindex", n_cache_size, f_memory, f_wipe)
{}
bool TxIndex::DB::ReadTxPos(const uint256 &txid, CDiskTxPos& pos) const
{
return Read(std::make_pair(DB_TXINDEX, txid), pos);
}
bool TxIndex::DB::WriteTxs(const std::vector<std::pair<uint256, CDiskTxPos>>& v_pos)
{
CDBBatch batch(*this);
for (const auto& tuple : v_pos) {
batch.Write(std::make_pair(DB_TXINDEX, tuple.first), tuple.second);
}
return WriteBatch(batch);
}
TxIndex::TxIndex(std::unique_ptr<interfaces::Chain> chain, size_t n_cache_size, bool f_memory, bool f_wipe)
: BaseIndex(std::move(chain)), m_db(std::make_unique<TxIndex::DB>(n_cache_size, f_memory, f_wipe))
{}
TxIndex::~TxIndex() = default;
bool TxIndex::WriteBlock(const CBlock& block, const CBlockIndex* pindex)
{
// Exclude genesis block transaction because outputs are not spendable.
if (pindex->nHeight == 0) return true;
CDiskTxPos pos{
WITH_LOCK(::cs_main, return pindex->GetBlockPos()),
GetSizeOfCompactSize(block.vtx.size())};
std::vector<std::pair<uint256, CDiskTxPos>> vPos;
vPos.reserve(block.vtx.size());
for (const auto& tx : block.vtx) {
vPos.emplace_back(tx->GetHash(), pos);
pos.nTxOffset += ::GetSerializeSize(*tx, CLIENT_VERSION);
}
return m_db->WriteTxs(vPos);
}
BaseIndex::DB& TxIndex::GetDB() const { return *m_db; }
bool TxIndex::FindTx(const uint256& tx_hash, uint256& block_hash, CTransactionRef& tx) const
{
CDiskTxPos postx;
if (!m_db->ReadTxPos(tx_hash, postx)) {
return false;
}
CAutoFile file(OpenBlockFile(postx, true), SER_DISK, CLIENT_VERSION);
if (file.IsNull()) {
return error("%s: OpenBlockFile failed", __func__);
}
CBlockHeader header;
try {
file >> header;
if (fseek(file.Get(), postx.nTxOffset, SEEK_CUR)) {
return error("%s: fseek(...) failed", __func__);
}
file >> tx;
} catch (const std::exception& e) {
return error("%s: Deserialize or I/O error - %s", __func__, e.what());
}
if (tx->GetHash() != tx_hash) {
return error("%s: txid mismatch", __func__);
}
block_hash = header.GetHash();
return true;
}
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