0a8054e7cd
818dc74 Support serialization as another type without casting (Pieter Wuille)
Pull request description:
This adds a `READWRITEAS(type, obj)` macro which serializes `obj` as if it were converted to `const type&` when `const`, and to `type&` when non-`const`. No actual cast is involved, so this only works when this conversion can be done automatically.
This makes it usable in serialization code that uses a single implementation for both serialization and deserializing, which doesn't know the constness of the object involved.
This is a redo of #12712, using a slightly different interface.
Tree-SHA512: 262f0257284ff99b5ffaec9b997c194e221522ba35c3ac8eaa9bb344449d7ea0a314de254dc77449fa7aaa600f8cd9a24da65aade8c1ec6aa80c6e9a7bba5ca7
130 lines
4.4 KiB
C++
130 lines
4.4 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2017 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 <chain.h>
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#include <map>
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#include <memory>
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#include <string>
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#include <utility>
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#include <vector>
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class CBlockIndex;
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class CCoinsViewDBCursor;
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class uint256;
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//! No need to periodic flush if at least this much space still available.
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static constexpr int MAX_BLOCK_COINSDB_USAGE = 10;
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//! -dbcache default (MiB)
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static const int64_t nDefaultDbCache = 450;
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//! -dbbatchsize default (bytes)
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static const int64_t nDefaultDbBatchSize = 16 << 20;
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//! max. -dbcache (MiB)
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static const int64_t nMaxDbCache = sizeof(void*) > 4 ? 16384 : 1024;
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//! min. -dbcache (MiB)
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static const int64_t nMinDbCache = 4;
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//! Max memory allocated to block tree DB specific cache, if no -txindex (MiB)
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static const int64_t nMaxBlockDBCache = 2;
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//! Max memory allocated to block tree DB specific cache, if -txindex (MiB)
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// Unlike for the UTXO database, for the txindex scenario the leveldb cache make
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// a meaningful difference: https://github.com/bitcoin/bitcoin/pull/8273#issuecomment-229601991
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static const int64_t nMaxBlockDBAndTxIndexCache = 1024;
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//! Max memory allocated to coin DB specific cache (MiB)
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static const int64_t nMaxCoinsDBCache = 8;
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struct CDiskTxPos : public CDiskBlockPos
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{
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unsigned int nTxOffset; // after header
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ADD_SERIALIZE_METHODS;
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template <typename Stream, typename Operation>
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inline void SerializationOp(Stream& s, Operation ser_action) {
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READWRITEAS(CDiskBlockPos, *this);
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READWRITE(VARINT(nTxOffset));
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}
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CDiskTxPos(const CDiskBlockPos &blockIn, unsigned int nTxOffsetIn) : CDiskBlockPos(blockIn.nFile, blockIn.nPos), nTxOffset(nTxOffsetIn) {
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}
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CDiskTxPos() {
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SetNull();
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}
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void SetNull() {
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CDiskBlockPos::SetNull();
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nTxOffset = 0;
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}
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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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CDBWrapper db;
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public:
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explicit CCoinsViewDB(size_t nCacheSize, bool fMemory = false, bool fWipe = false);
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bool GetCoin(const COutPoint &outpoint, Coin &coin) 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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bool BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock) override;
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CCoinsViewCursor *Cursor() const override;
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//! Attempt to update from an older database format. Returns whether an error occurred.
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bool Upgrade();
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size_t EstimateSize() const override;
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};
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/** Specialization of CCoinsViewCursor to iterate over a CCoinsViewDB */
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class CCoinsViewDBCursor: public CCoinsViewCursor
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{
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public:
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~CCoinsViewDBCursor() {}
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bool GetKey(COutPoint &key) const override;
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bool GetValue(Coin &coin) const override;
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unsigned int GetValueSize() const override;
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bool Valid() const override;
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void Next() override;
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private:
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CCoinsViewDBCursor(CDBIterator* pcursorIn, const uint256 &hashBlockIn):
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CCoinsViewCursor(hashBlockIn), pcursor(pcursorIn) {}
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std::unique_ptr<CDBIterator> pcursor;
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std::pair<char, COutPoint> keyTmp;
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friend class CCoinsViewDB;
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};
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/** Access to the block database (blocks/index/) */
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class CBlockTreeDB : public CDBWrapper
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{
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public:
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explicit CBlockTreeDB(size_t nCacheSize, bool fMemory = false, bool fWipe = false);
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CBlockTreeDB(const CBlockTreeDB&) = delete;
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CBlockTreeDB& operator=(const CBlockTreeDB&) = delete;
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bool WriteBatchSync(const std::vector<std::pair<int, const CBlockFileInfo*> >& fileInfo, int nLastFile, const std::vector<const CBlockIndex*>& blockinfo);
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bool ReadBlockFileInfo(int nFile, CBlockFileInfo &info);
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bool ReadLastBlockFile(int &nFile);
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bool WriteReindexing(bool fReindexing);
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bool ReadReindexing(bool &fReindexing);
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bool ReadTxIndex(const uint256 &txid, CDiskTxPos &pos);
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bool WriteTxIndex(const std::vector<std::pair<uint256, CDiskTxPos> > &vect);
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bool WriteFlag(const std::string &name, bool fValue);
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bool ReadFlag(const std::string &name, bool &fValue);
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bool LoadBlockIndexGuts(const Consensus::Params& consensusParams, std::function<CBlockIndex*(const uint256&)> insertBlockIndex);
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};
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#endif // BITCOIN_TXDB_H
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