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86296f276d
`CCoinsView` provided default no-op implementations, which allowed constructing a bare view and silently getting dummy behavior. Make all interface methods pure virtual and remove the legacy default definitions from `coins.cpp` so callers must choose an explicit implementation. Move the virtual destructor to the beginning to avoid mixing it between the methods. No-op backing behavior remains available via `CoinsViewEmpty`.
60 lines
1.9 KiB
C++
60 lines
1.9 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-present 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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#ifndef BITCOIN_TXDB_H
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#define BITCOIN_TXDB_H
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#include <coins.h>
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#include <dbwrapper.h>
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#include <kernel/caches.h>
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#include <kernel/cs_main.h>
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#include <sync.h>
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#include <util/fs.h>
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#include <cstddef>
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#include <cstdint>
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#include <memory>
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#include <optional>
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#include <vector>
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class COutPoint;
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class uint256;
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//! User-controlled performance and debug options.
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struct CoinsViewOptions {
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//! Maximum database write batch size in bytes.
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size_t batch_write_bytes{DEFAULT_DB_CACHE_BATCH};
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//! If non-zero, randomly exit when the database is flushed with (1/ratio) probability.
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int simulate_crash_ratio{0};
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};
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/** CCoinsView backed by the coin database (chainstate/) */
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class CCoinsViewDB final : public CCoinsView
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{
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protected:
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DBParams m_db_params;
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CoinsViewOptions m_options;
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std::unique_ptr<CDBWrapper> m_db;
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public:
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explicit CCoinsViewDB(DBParams db_params, CoinsViewOptions options);
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std::optional<Coin> GetCoin(const COutPoint& outpoint) const override;
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std::optional<Coin> PeekCoin(const COutPoint& outpoint) const override;
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bool HaveCoin(const COutPoint& outpoint) const override;
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uint256 GetBestBlock() const override;
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std::vector<uint256> GetHeadBlocks() const override;
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void BatchWrite(CoinsViewCacheCursor& cursor, const uint256& block_hash) override;
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std::unique_ptr<CCoinsViewCursor> Cursor() const override;
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//! Whether an unsupported database format is used.
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bool NeedsUpgrade();
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size_t EstimateSize() const override;
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//! Dynamically alter the underlying leveldb cache size.
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void ResizeCache(size_t new_cache_size) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
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};
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#endif // BITCOIN_TXDB_H
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