base.h

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// Copyright (c) 2017-2020 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_INDEX_BASE_H
#define BITCOIN_INDEX_BASE_H

#include <dbwrapper.h>
#include <primitives/block.h>
#include <primitives/transaction.h>
#include <threadinterrupt.h>
#include <validationinterface.h>

class CBlockIndex;

struct IndexSummary {
    std::string name;
    bool synced{false};
    int best_block_height{0};
};

class BaseIndex : public CValidationInterface
{
protected:
    class DB : public CDBWrapper
    {
    public:
        DB(const fs::path& path, size_t n_cache_size,
           bool f_memory = false, bool f_wipe = false, bool f_obfuscate = false);

        bool ReadBestBlock(CBlockLocator& locator) const;

        void WriteBestBlock(CDBBatch& batch, const CBlockLocator& locator);
    };

private:
    std::atomic<bool> m_synced{false};

    std::atomic<const CBlockIndex*> m_best_block_index{nullptr};

    std::thread m_thread_sync;
    CThreadInterrupt m_interrupt;

    void ThreadSync();

    bool Commit();

protected:
    void BlockConnected(const std::shared_ptr<const CBlock>& block, const CBlockIndex* pindex) override;

    void ChainStateFlushed(const CBlockLocator& locator) override;

    virtual bool Init();

    virtual bool WriteBlock(const CBlock& block, const CBlockIndex* pindex) { return true; }

    virtual bool CommitInternal(CDBBatch& batch);

    virtual bool Rewind(const CBlockIndex* current_tip, const CBlockIndex* new_tip);

    virtual DB& GetDB() const = 0;

    virtual const char* GetName() const = 0;

public:
    virtual ~BaseIndex();

    bool BlockUntilSyncedToCurrentChain() const;

    void Interrupt();

    void Start();

    void Stop();

    IndexSummary GetSummary() const;
};

#endif // BITCOIN_INDEX_BASE_H