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// Copyright (c) 2017-2018 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 <util.h>
#include <validation.h>
std::unique_ptr<TxIndex> g_txindex;
TxIndex::TxIndex(size_t n_cache_size, bool f_memory, bool f_wipe)
: m_db(MakeUnique<TxIndex::DB>(n_cache_size, f_memory, f_wipe))
{}
bool TxIndex::Init()
{
LOCK(cs_main);
// Attempt to migrate txindex from the old database to the new one. Even if
// chain_tip is null, the node could be reindexing and we still want to
// delete txindex records in the old database.
if (!m_db->MigrateData(*pblocktree, chainActive.GetLocator())) {
return false;
}
return BaseIndex::Init();
}
bool TxIndex::WriteBlock(const CBlock& block, const CBlockIndex* pindex)
{
CDiskTxPos pos(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, SER_DISK, CLIENT_VERSION);
}
return m_db->WriteTxs(vPos);
}
BaseIndexDB& 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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