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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_TXDB_H
#define BITCOIN_TXDB_H
#include <coins.h>
#include <dbwrapper.h>
#include <kernel/cs_main.h>
#include <sync.h>
#include <util/fs.h>
#include <cstddef>
#include <cstdint>
#include <memory>
#include <optional>
#include <vector>
class COutPoint;
class uint256;
//! -dbcache default (MiB)
static const int64_t nDefaultDbCache = 450;
//! -dbbatchsize default (bytes)
static const int64_t nDefaultDbBatchSize = 16 << 20;
//! min. -dbcache (MiB)
static const int64_t nMinDbCache = 4;
//! Max memory allocated to block tree DB specific cache, if no -txindex (MiB)
static const int64_t nMaxBlockDBCache = 2;
//! Max memory allocated to block tree DB specific cache, if -txindex (MiB)
// Unlike for the UTXO database, for the txindex scenario the leveldb cache make
// a meaningful difference: https://github.com/bitcoin/bitcoin/pull/8273#issuecomment-229601991
static const int64_t nMaxTxIndexCache = 1024;
//! Max memory allocated to all block filter index caches combined in MiB.
static const int64_t max_filter_index_cache = 1024;
//! Max memory allocated to coin DB specific cache (MiB)
static const int64_t nMaxCoinsDBCache = 8;
//! User-controlled performance and debug options.
struct CoinsViewOptions {
//! Maximum database write batch size in bytes.
size_t batch_write_bytes = nDefaultDbBatchSize;
//! If non-zero, randomly exit when the database is flushed with (1/ratio)
//! probability.
int simulate_crash_ratio = 0;
};
/** CCoinsView backed by the coin database (chainstate/) */
class CCoinsViewDB final : public CCoinsView
{
protected:
DBParams m_db_params;
CoinsViewOptions m_options;
std::unique_ptr<CDBWrapper> m_db;
public:
explicit CCoinsViewDB(DBParams db_params, CoinsViewOptions options);
bool GetCoin(const COutPoint &outpoint, Coin &coin) const override;
bool HaveCoin(const COutPoint &outpoint) const override;
uint256 GetBestBlock() const override;
std::vector<uint256> GetHeadBlocks() const override;
bool BatchWrite(CoinsViewCacheCursor& cursor, const uint256 &hashBlock) override;
std::unique_ptr<CCoinsViewCursor> Cursor() const override;
//! Whether an unsupported database format is used.
bool NeedsUpgrade();
size_t EstimateSize() const override;
//! Dynamically alter the underlying leveldb cache size.
void ResizeCache(size_t new_cache_size) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
//! @returns filesystem path to on-disk storage or std::nullopt if in memory.
std::optional<fs::path> StoragePath() { return m_db->StoragePath(); }
};
#endif // BITCOIN_TXDB_H
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