validation.h

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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_VALIDATION_H
#define BITCOIN_VALIDATION_H

#include <arith_uint256.h>
#include <attributes.h>
#include <chain.h>
#include <checkqueue.h>
#include <consensus/amount.h>
#include <cuckoocache.h>
#include <deploymentstatus.h>
#include <kernel/chain.h>
#include <kernel/chainparams.h>
#include <kernel/chainstatemanager_opts.h>
#include <kernel/cs_main.h> // IWYU pragma: export
#include <node/blockstorage.h>
#include <policy/feerate.h>
#include <policy/packages.h>
#include <policy/policy.h>
#include <script/script_error.h>
#include <script/sigcache.h>
#include <sync.h>
#include <txdb.h>
#include <txmempool.h> // For CTxMemPool::cs
#include <uint256.h>
#include <util/check.h>
#include <util/fs.h>
#include <util/hasher.h>
#include <util/result.h>
#include <util/translation.h>
#include <versionbits.h>

#include <atomic>
#include <map>
#include <memory>
#include <optional>
#include <set>
#include <stdint.h>
#include <string>
#include <thread>
#include <type_traits>
#include <utility>
#include <vector>

class Chainstate;
class CTxMemPool;
class ChainstateManager;
struct ChainTxData;
class DisconnectedBlockTransactions;
struct PrecomputedTransactionData;
struct LockPoints;
struct AssumeutxoData;
namespace node {
class SnapshotMetadata;
} // namespace node
namespace Consensus {
struct Params;
} // namespace Consensus
namespace util {
class SignalInterrupt;
} // namespace util

static const unsigned int MIN_BLOCKS_TO_KEEP = 288;
static const signed int DEFAULT_CHECKBLOCKS = 6;
static constexpr int DEFAULT_CHECKLEVEL{3};
// Require that user allocate at least 550 MiB for block & undo files (blk???.dat and rev???.dat)
// At 1MB per block, 288 blocks = 288MB.
// Add 15% for Undo data = 331MB
// Add 20% for Orphan block rate = 397MB
// We want the low water mark after pruning to be at least 397 MB and since we prune in
// full block file chunks, we need the high water mark which triggers the prune to be
// one 128MB block file + added 15% undo data = 147MB greater for a total of 545MB
// Setting the target to >= 550 MiB will make it likely we can respect the target.
static const uint64_t MIN_DISK_SPACE_FOR_BLOCK_FILES = 550 * 1024 * 1024;

enum class SynchronizationState {
    INIT_REINDEX,
    INIT_DOWNLOAD,
    POST_INIT
};

extern GlobalMutex g_best_block_mutex;
extern std::condition_variable g_best_block_cv;
extern uint256 g_best_block;

extern const std::vector<std::string> CHECKLEVEL_DOC;

CAmount GetBlockSubsidy(int nHeight, const Consensus::Params& consensusParams);

bool FatalError(kernel::Notifications& notifications, BlockValidationState& state, const bilingual_str& message);

double GuessVerificationProgress(const ChainTxData& data, const CBlockIndex* pindex);

void PruneBlockFilesManual(Chainstate& active_chainstate, int nManualPruneHeight);

struct MempoolAcceptResult {
    enum class ResultType {
        VALID, 
        INVALID, 
        MEMPOOL_ENTRY, 
        DIFFERENT_WITNESS, 
    };
    const ResultType m_result_type;

    const TxValidationState m_state;

    const std::list<CTransactionRef> m_replaced_transactions;
    const std::optional<int64_t> m_vsize;
    const std::optional<CAmount> m_base_fees;
    const std::optional<CFeeRate> m_effective_feerate;
    const std::optional<std::vector<Wtxid>> m_wtxids_fee_calculations;

    const std::optional<uint256> m_other_wtxid;

    static MempoolAcceptResult Failure(TxValidationState state) {
        return MempoolAcceptResult(state);
    }

    static MempoolAcceptResult FeeFailure(TxValidationState state,
                                          CFeeRate effective_feerate,
                                          const std::vector<Wtxid>& wtxids_fee_calculations) {
        return MempoolAcceptResult(state, effective_feerate, wtxids_fee_calculations);
    }

    static MempoolAcceptResult Success(std::list<CTransactionRef>&& replaced_txns,
                                       int64_t vsize,
                                       CAmount fees,
                                       CFeeRate effective_feerate,
                                       const std::vector<Wtxid>& wtxids_fee_calculations) {
        return MempoolAcceptResult(std::move(replaced_txns), vsize, fees,
                                   effective_feerate, wtxids_fee_calculations);
    }

    static MempoolAcceptResult MempoolTx(int64_t vsize, CAmount fees) {
        return MempoolAcceptResult(vsize, fees);
    }

    static MempoolAcceptResult MempoolTxDifferentWitness(const uint256& other_wtxid) {
        return MempoolAcceptResult(other_wtxid);
    }

// Private constructors. Use static methods MempoolAcceptResult::Success, etc. to construct.
private:
    explicit MempoolAcceptResult(TxValidationState state)
        : m_result_type(ResultType::INVALID), m_state(state) {
            Assume(!state.IsValid()); // Can be invalid or error
        }

    explicit MempoolAcceptResult(std::list<CTransactionRef>&& replaced_txns,
                                 int64_t vsize,
                                 CAmount fees,
                                 CFeeRate effective_feerate,
                                 const std::vector<Wtxid>& wtxids_fee_calculations)
        : m_result_type(ResultType::VALID),
        m_replaced_transactions(std::move(replaced_txns)),
        m_vsize{vsize},
        m_base_fees(fees),
        m_effective_feerate(effective_feerate),
        m_wtxids_fee_calculations(wtxids_fee_calculations) {}

    explicit MempoolAcceptResult(TxValidationState state,
                                 CFeeRate effective_feerate,
                                 const std::vector<Wtxid>& wtxids_fee_calculations)
        : m_result_type(ResultType::INVALID),
        m_state(state),
        m_effective_feerate(effective_feerate),
        m_wtxids_fee_calculations(wtxids_fee_calculations) {}

    explicit MempoolAcceptResult(int64_t vsize, CAmount fees)
        : m_result_type(ResultType::MEMPOOL_ENTRY), m_vsize{vsize}, m_base_fees(fees) {}

    explicit MempoolAcceptResult(const uint256& other_wtxid)
        : m_result_type(ResultType::DIFFERENT_WITNESS), m_other_wtxid(other_wtxid) {}
};

struct PackageMempoolAcceptResult
{
    PackageValidationState m_state;
    std::map<uint256, MempoolAcceptResult> m_tx_results;

    explicit PackageMempoolAcceptResult(PackageValidationState state,
                                        std::map<uint256, MempoolAcceptResult>&& results)
        : m_state{state}, m_tx_results(std::move(results)) {}

    explicit PackageMempoolAcceptResult(PackageValidationState state, CFeeRate feerate,
                                        std::map<uint256, MempoolAcceptResult>&& results)
        : m_state{state}, m_tx_results(std::move(results)) {}

    explicit PackageMempoolAcceptResult(const uint256& wtxid, const MempoolAcceptResult& result)
        : m_tx_results{ {wtxid, result} } {}
};

MempoolAcceptResult AcceptToMemoryPool(Chainstate& active_chainstate, const CTransactionRef& tx,
                                       int64_t accept_time, bool bypass_limits, bool test_accept)
    EXCLUSIVE_LOCKS_REQUIRED(cs_main);

PackageMempoolAcceptResult ProcessNewPackage(Chainstate& active_chainstate, CTxMemPool& pool,
                                                   const Package& txns, bool test_accept, const std::optional<CFeeRate>& client_maxfeerate)
                                                   EXCLUSIVE_LOCKS_REQUIRED(cs_main);

/* Mempool validation helper functions */

bool CheckFinalTxAtTip(const CBlockIndex& active_chain_tip, const CTransaction& tx) EXCLUSIVE_LOCKS_REQUIRED(::cs_main);

std::optional<LockPoints> CalculateLockPointsAtTip(
    CBlockIndex* tip,
    const CCoinsView& coins_view,
    const CTransaction& tx);

bool CheckSequenceLocksAtTip(CBlockIndex* tip,
                             const LockPoints& lock_points);

class CScriptCheck
{
private:
    CTxOut m_tx_out;
    const CTransaction *ptxTo;
    unsigned int nIn;
    unsigned int nFlags;
    bool cacheStore;
    ScriptError error{SCRIPT_ERR_UNKNOWN_ERROR};
    PrecomputedTransactionData *txdata;
    SignatureCache* m_signature_cache;

public:
    CScriptCheck(const CTxOut& outIn, const CTransaction& txToIn, SignatureCache& signature_cache, unsigned int nInIn, unsigned int nFlagsIn, bool cacheIn, PrecomputedTransactionData* txdataIn) :
        m_tx_out(outIn), ptxTo(&txToIn), nIn(nInIn), nFlags(nFlagsIn), cacheStore(cacheIn), txdata(txdataIn), m_signature_cache(&signature_cache) { }

    CScriptCheck(const CScriptCheck&) = delete;
    CScriptCheck& operator=(const CScriptCheck&) = delete;
    CScriptCheck(CScriptCheck&&) = default;
    CScriptCheck& operator=(CScriptCheck&&) = default;

    bool operator()();

    ScriptError GetScriptError() const { return error; }
};

// CScriptCheck is used a lot in std::vector, make sure that's efficient
static_assert(std::is_nothrow_move_assignable_v<CScriptCheck>);
static_assert(std::is_nothrow_move_constructible_v<CScriptCheck>);
static_assert(std::is_nothrow_destructible_v<CScriptCheck>);

class ValidationCache
{
private:
    CSHA256 m_script_execution_cache_hasher;

public:
    CuckooCache::cache<uint256, SignatureCacheHasher> m_script_execution_cache;
    SignatureCache m_signature_cache;

    ValidationCache(size_t script_execution_cache_bytes, size_t signature_cache_bytes);

    ValidationCache(const ValidationCache&) = delete;
    ValidationCache& operator=(const ValidationCache&) = delete;

    CSHA256 ScriptExecutionCacheHasher() const { return m_script_execution_cache_hasher; }
};

bool CheckBlock(const CBlock& block, BlockValidationState& state, const Consensus::Params& consensusParams, bool fCheckPOW = true, bool fCheckMerkleRoot = true);

bool TestBlockValidity(BlockValidationState& state,
                       const CChainParams& chainparams,
                       Chainstate& chainstate,
                       const CBlock& block,
                       CBlockIndex* pindexPrev,
                       bool fCheckPOW = true,
                       bool fCheckMerkleRoot = true) EXCLUSIVE_LOCKS_REQUIRED(cs_main);

bool HasValidProofOfWork(const std::vector<CBlockHeader>& headers, const Consensus::Params& consensusParams);

bool IsBlockMutated(const CBlock& block, bool check_witness_root);

arith_uint256 CalculateClaimedHeadersWork(const std::vector<CBlockHeader>& headers);

enum class VerifyDBResult {
    SUCCESS,
    CORRUPTED_BLOCK_DB,
    INTERRUPTED,
    SKIPPED_L3_CHECKS,
    SKIPPED_MISSING_BLOCKS,
};

class CVerifyDB
{
private:
    kernel::Notifications& m_notifications;

public:
    explicit CVerifyDB(kernel::Notifications& notifications);
    ~CVerifyDB();
    [[nodiscard]] VerifyDBResult VerifyDB(
        Chainstate& chainstate,
        const Consensus::Params& consensus_params,
        CCoinsView& coinsview,
        int nCheckLevel,
        int nCheckDepth) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
};

enum DisconnectResult
{
    DISCONNECT_OK,      // All good.
    DISCONNECT_UNCLEAN, // Rolled back, but UTXO set was inconsistent with block.
    DISCONNECT_FAILED   // Something else went wrong.
};

class ConnectTrace;

enum class FlushStateMode {
    NONE,
    IF_NEEDED,
    PERIODIC,
    ALWAYS
};

class CoinsViews {

public:
    CCoinsViewDB m_dbview GUARDED_BY(cs_main);

    CCoinsViewErrorCatcher m_catcherview GUARDED_BY(cs_main);

    std::unique_ptr<CCoinsViewCache> m_cacheview GUARDED_BY(cs_main);

    CoinsViews(DBParams db_params, CoinsViewOptions options);

    void InitCache() EXCLUSIVE_LOCKS_REQUIRED(::cs_main);
};

enum class CoinsCacheSizeState
{
    CRITICAL = 2,
    LARGE = 1,
    OK = 0
};

class Chainstate
{
protected:
    Mutex m_chainstate_mutex;

    CTxMemPool* m_mempool;

    std::unique_ptr<CoinsViews> m_coins_views;

    bool m_disabled GUARDED_BY(::cs_main) {false};

    const CBlockIndex* m_cached_snapshot_base GUARDED_BY(::cs_main) {nullptr};

public:
    node::BlockManager& m_blockman;

    ChainstateManager& m_chainman;

    explicit Chainstate(
        CTxMemPool* mempool,
        node::BlockManager& blockman,
        ChainstateManager& chainman,
        std::optional<uint256> from_snapshot_blockhash = std::nullopt);

    ChainstateRole GetRole() const EXCLUSIVE_LOCKS_REQUIRED(::cs_main);

    void InitCoinsDB(
        size_t cache_size_bytes,
        bool in_memory,
        bool should_wipe,
        fs::path leveldb_name = "chainstate");

    void InitCoinsCache(size_t cache_size_bytes) EXCLUSIVE_LOCKS_REQUIRED(::cs_main);

    bool CanFlushToDisk() const EXCLUSIVE_LOCKS_REQUIRED(::cs_main)
    {
        AssertLockHeld(::cs_main);
        return m_coins_views && m_coins_views->m_cacheview;
    }

    CChain m_chain;

    const std::optional<uint256> m_from_snapshot_blockhash;

    const CBlockIndex* SnapshotBase() EXCLUSIVE_LOCKS_REQUIRED(::cs_main);

    std::set<CBlockIndex*, node::CBlockIndexWorkComparator> setBlockIndexCandidates;

    CCoinsViewCache& CoinsTip() EXCLUSIVE_LOCKS_REQUIRED(::cs_main)
    {
        AssertLockHeld(::cs_main);
        Assert(m_coins_views);
        return *Assert(m_coins_views->m_cacheview);
    }

    CCoinsViewDB& CoinsDB() EXCLUSIVE_LOCKS_REQUIRED(::cs_main)
    {
        AssertLockHeld(::cs_main);
        return Assert(m_coins_views)->m_dbview;
    }

    CTxMemPool* GetMempool()
    {
        return m_mempool;
    }

    CCoinsViewErrorCatcher& CoinsErrorCatcher() EXCLUSIVE_LOCKS_REQUIRED(::cs_main)
    {
        AssertLockHeld(::cs_main);
        return Assert(m_coins_views)->m_catcherview;
    }

    void ResetCoinsViews() { m_coins_views.reset(); }

    bool HasCoinsViews() const { return (bool)m_coins_views; }

    size_t m_coinsdb_cache_size_bytes{0};

    size_t m_coinstip_cache_size_bytes{0};

    bool ResizeCoinsCaches(size_t coinstip_size, size_t coinsdb_size)
        EXCLUSIVE_LOCKS_REQUIRED(::cs_main);

    bool FlushStateToDisk(
        BlockValidationState& state,
        FlushStateMode mode,
        int nManualPruneHeight = 0);

    void ForceFlushStateToDisk();

    void PruneAndFlush();

    bool ActivateBestChain(
        BlockValidationState& state,
        std::shared_ptr<const CBlock> pblock = nullptr)
        EXCLUSIVE_LOCKS_REQUIRED(!m_chainstate_mutex)
        LOCKS_EXCLUDED(::cs_main);

    // Block (dis)connection on a given view:
    DisconnectResult DisconnectBlock(const CBlock& block, const CBlockIndex* pindex, CCoinsViewCache& view)
        EXCLUSIVE_LOCKS_REQUIRED(::cs_main);
    bool ConnectBlock(const CBlock& block, BlockValidationState& state, CBlockIndex* pindex,
                      CCoinsViewCache& view, bool fJustCheck = false) EXCLUSIVE_LOCKS_REQUIRED(cs_main);

    // Apply the effects of a block disconnection on the UTXO set.
    bool DisconnectTip(BlockValidationState& state, DisconnectedBlockTransactions* disconnectpool) EXCLUSIVE_LOCKS_REQUIRED(cs_main, m_mempool->cs);

    // Manual block validity manipulation:
    bool PreciousBlock(BlockValidationState& state, CBlockIndex* pindex)
        EXCLUSIVE_LOCKS_REQUIRED(!m_chainstate_mutex)
        LOCKS_EXCLUDED(::cs_main);

    bool InvalidateBlock(BlockValidationState& state, CBlockIndex* pindex)
        EXCLUSIVE_LOCKS_REQUIRED(!m_chainstate_mutex)
        LOCKS_EXCLUDED(::cs_main);

    void ResetBlockFailureFlags(CBlockIndex* pindex) EXCLUSIVE_LOCKS_REQUIRED(cs_main);

    bool ReplayBlocks();

    [[nodiscard]] bool NeedsRedownload() const EXCLUSIVE_LOCKS_REQUIRED(cs_main);
    bool LoadGenesisBlock();

    void TryAddBlockIndexCandidate(CBlockIndex* pindex) EXCLUSIVE_LOCKS_REQUIRED(cs_main);

    void PruneBlockIndexCandidates();

    void ClearBlockIndexCandidates() EXCLUSIVE_LOCKS_REQUIRED(::cs_main);

    const CBlockIndex* FindForkInGlobalIndex(const CBlockLocator& locator) const EXCLUSIVE_LOCKS_REQUIRED(cs_main);

    bool LoadChainTip() EXCLUSIVE_LOCKS_REQUIRED(cs_main);

    CoinsCacheSizeState GetCoinsCacheSizeState() EXCLUSIVE_LOCKS_REQUIRED(::cs_main);

    CoinsCacheSizeState GetCoinsCacheSizeState(
        size_t max_coins_cache_size_bytes,
        size_t max_mempool_size_bytes) EXCLUSIVE_LOCKS_REQUIRED(::cs_main);

    std::string ToString() EXCLUSIVE_LOCKS_REQUIRED(::cs_main);

    RecursiveMutex* MempoolMutex() const LOCK_RETURNED(m_mempool->cs)
    {
        return m_mempool ? &m_mempool->cs : nullptr;
    }

private:
    bool ActivateBestChainStep(BlockValidationState& state, CBlockIndex* pindexMostWork, const std::shared_ptr<const CBlock>& pblock, bool& fInvalidFound, ConnectTrace& connectTrace) EXCLUSIVE_LOCKS_REQUIRED(cs_main, m_mempool->cs);
    bool ConnectTip(BlockValidationState& state, CBlockIndex* pindexNew, const std::shared_ptr<const CBlock>& pblock, ConnectTrace& connectTrace, DisconnectedBlockTransactions& disconnectpool) EXCLUSIVE_LOCKS_REQUIRED(cs_main, m_mempool->cs);

    void InvalidBlockFound(CBlockIndex* pindex, const BlockValidationState& state) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
    CBlockIndex* FindMostWorkChain() EXCLUSIVE_LOCKS_REQUIRED(cs_main);

    bool RollforwardBlock(const CBlockIndex* pindex, CCoinsViewCache& inputs) EXCLUSIVE_LOCKS_REQUIRED(cs_main);

    void CheckForkWarningConditions() EXCLUSIVE_LOCKS_REQUIRED(cs_main);
    void InvalidChainFound(CBlockIndex* pindexNew) EXCLUSIVE_LOCKS_REQUIRED(cs_main);

    void MaybeUpdateMempoolForReorg(
        DisconnectedBlockTransactions& disconnectpool,
        bool fAddToMempool) EXCLUSIVE_LOCKS_REQUIRED(cs_main, m_mempool->cs);

    void UpdateTip(const CBlockIndex* pindexNew)
        EXCLUSIVE_LOCKS_REQUIRED(::cs_main);

    SteadyClock::time_point m_last_write{};
    SteadyClock::time_point m_last_flush{};

    [[nodiscard]] util::Result<void> InvalidateCoinsDBOnDisk() EXCLUSIVE_LOCKS_REQUIRED(::cs_main);

    friend ChainstateManager;
};

enum class SnapshotCompletionResult {
    SUCCESS,
    SKIPPED,

    // Expected assumeutxo configuration data is not found for the height of the
    // base block.
    MISSING_CHAINPARAMS,

    // Failed to generate UTXO statistics (to check UTXO set hash) for the background
    // chainstate.
    STATS_FAILED,

    // The UTXO set hash of the background validation chainstate does not match
    // the one expected by assumeutxo chainparams.
    HASH_MISMATCH,

    // The blockhash of the current tip of the background validation chainstate does
    // not match the one expected by the snapshot chainstate.
    BASE_BLOCKHASH_MISMATCH,
};

class ChainstateManager
{
private:
    std::unique_ptr<Chainstate> m_ibd_chainstate GUARDED_BY(::cs_main);

    std::unique_ptr<Chainstate> m_snapshot_chainstate GUARDED_BY(::cs_main);

    Chainstate* m_active_chainstate GUARDED_BY(::cs_main) {nullptr};

    CBlockIndex* m_best_invalid GUARDED_BY(::cs_main){nullptr};

    CBlockIndex* m_last_notified_header GUARDED_BY(GetMutex()){nullptr};

    bool NotifyHeaderTip() LOCKS_EXCLUDED(GetMutex());

    [[nodiscard]] util::Result<void> PopulateAndValidateSnapshot(
        Chainstate& snapshot_chainstate,
        AutoFile& coins_file,
        const node::SnapshotMetadata& metadata);

    bool AcceptBlockHeader(
        const CBlockHeader& block,
        BlockValidationState& state,
        CBlockIndex** ppindex,
        bool min_pow_checked) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
    friend Chainstate;

    std::chrono::time_point<std::chrono::steady_clock> m_last_presync_update GUARDED_BY(::cs_main) {};

    std::array<ThresholdConditionCache, VERSIONBITS_NUM_BITS> m_warningcache GUARDED_BY(::cs_main);

    bool IsUsable(const Chainstate* const cs) const EXCLUSIVE_LOCKS_REQUIRED(::cs_main) {
        return cs && !cs->m_disabled;
    }

    CCheckQueue<CScriptCheck> m_script_check_queue;

    SteadyClock::duration GUARDED_BY(::cs_main) time_check{};
    SteadyClock::duration GUARDED_BY(::cs_main) time_forks{};
    SteadyClock::duration GUARDED_BY(::cs_main) time_connect{};
    SteadyClock::duration GUARDED_BY(::cs_main) time_verify{};
    SteadyClock::duration GUARDED_BY(::cs_main) time_undo{};
    SteadyClock::duration GUARDED_BY(::cs_main) time_index{};
    SteadyClock::duration GUARDED_BY(::cs_main) time_total{};
    int64_t GUARDED_BY(::cs_main) num_blocks_total{0};
    SteadyClock::duration GUARDED_BY(::cs_main) time_connect_total{};
    SteadyClock::duration GUARDED_BY(::cs_main) time_flush{};
    SteadyClock::duration GUARDED_BY(::cs_main) time_chainstate{};
    SteadyClock::duration GUARDED_BY(::cs_main) time_post_connect{};

public:
    using Options = kernel::ChainstateManagerOpts;

    explicit ChainstateManager(const util::SignalInterrupt& interrupt, Options options, node::BlockManager::Options blockman_options);

    std::function<void()> snapshot_download_completed = std::function<void()>();

    const CChainParams& GetParams() const { return m_options.chainparams; }
    const Consensus::Params& GetConsensus() const { return m_options.chainparams.GetConsensus(); }
    bool ShouldCheckBlockIndex() const;
    const arith_uint256& MinimumChainWork() const { return *Assert(m_options.minimum_chain_work); }
    const uint256& AssumedValidBlock() const { return *Assert(m_options.assumed_valid_block); }
    kernel::Notifications& GetNotifications() const { return m_options.notifications; };

    void CheckBlockIndex();

    RecursiveMutex& GetMutex() const LOCK_RETURNED(::cs_main) { return ::cs_main; }

    const util::SignalInterrupt& m_interrupt;
    const Options m_options;
    std::thread m_thread_load;
    node::BlockManager m_blockman;

    ValidationCache m_validation_cache;

    mutable std::atomic<bool> m_cached_finished_ibd{false};

    int32_t nBlockSequenceId GUARDED_BY(::cs_main) = 1;
    int32_t nBlockReverseSequenceId = -1;
    arith_uint256 nLastPreciousChainwork = 0;

    // Reset the memory-only sequence counters we use to track block arrival
    // (used by tests to reset state)
    void ResetBlockSequenceCounters() EXCLUSIVE_LOCKS_REQUIRED(::cs_main)
    {
        AssertLockHeld(::cs_main);
        nBlockSequenceId = 1;
        nBlockReverseSequenceId = -1;
    }


    std::set<CBlockIndex*> m_failed_blocks;

    CBlockIndex* m_best_header GUARDED_BY(::cs_main){nullptr};

    int64_t m_total_coinstip_cache{0};
    //
    int64_t m_total_coinsdb_cache{0};

    //                                  constructor
    Chainstate& InitializeChainstate(CTxMemPool* mempool) EXCLUSIVE_LOCKS_REQUIRED(::cs_main);

    std::vector<Chainstate*> GetAll();

    [[nodiscard]] util::Result<CBlockIndex*> ActivateSnapshot(
        AutoFile& coins_file, const node::SnapshotMetadata& metadata, bool in_memory);

    SnapshotCompletionResult MaybeCompleteSnapshotValidation() EXCLUSIVE_LOCKS_REQUIRED(::cs_main);

    const CBlockIndex* GetSnapshotBaseBlock() const EXCLUSIVE_LOCKS_REQUIRED(::cs_main);

    Chainstate& ActiveChainstate() const;
    CChain& ActiveChain() const EXCLUSIVE_LOCKS_REQUIRED(GetMutex()) { return ActiveChainstate().m_chain; }
    int ActiveHeight() const EXCLUSIVE_LOCKS_REQUIRED(GetMutex()) { return ActiveChain().Height(); }
    CBlockIndex* ActiveTip() const EXCLUSIVE_LOCKS_REQUIRED(GetMutex()) { return ActiveChain().Tip(); }

    bool BackgroundSyncInProgress() const EXCLUSIVE_LOCKS_REQUIRED(GetMutex()) {
        return IsUsable(m_snapshot_chainstate.get()) && IsUsable(m_ibd_chainstate.get());
    }

    const CBlockIndex* GetBackgroundSyncTip() const EXCLUSIVE_LOCKS_REQUIRED(GetMutex()) {
        return BackgroundSyncInProgress() ? m_ibd_chainstate->m_chain.Tip() : nullptr;
    }

    node::BlockMap& BlockIndex() EXCLUSIVE_LOCKS_REQUIRED(::cs_main)
    {
        AssertLockHeld(::cs_main);
        return m_blockman.m_block_index;
    }

    mutable VersionBitsCache m_versionbitscache;

    bool IsSnapshotActive() const;

    std::optional<uint256> SnapshotBlockhash() const;

    bool IsSnapshotValidated() const EXCLUSIVE_LOCKS_REQUIRED(::cs_main)
    {
        return m_snapshot_chainstate && m_ibd_chainstate && m_ibd_chainstate->m_disabled;
    }

    bool IsInitialBlockDownload() const;

    void LoadExternalBlockFile(
        AutoFile& file_in,
        FlatFilePos* dbp = nullptr,
        std::multimap<uint256, FlatFilePos>* blocks_with_unknown_parent = nullptr);

    bool ProcessNewBlock(const std::shared_ptr<const CBlock>& block, bool force_processing, bool min_pow_checked, bool* new_block) LOCKS_EXCLUDED(cs_main);

    bool ProcessNewBlockHeaders(const std::vector<CBlockHeader>& block, bool min_pow_checked, BlockValidationState& state, const CBlockIndex** ppindex = nullptr) LOCKS_EXCLUDED(cs_main);

    bool AcceptBlock(const std::shared_ptr<const CBlock>& pblock, BlockValidationState& state, CBlockIndex** ppindex, bool fRequested, const FlatFilePos* dbp, bool* fNewBlock, bool min_pow_checked) EXCLUSIVE_LOCKS_REQUIRED(cs_main);

    void ReceivedBlockTransactions(const CBlock& block, CBlockIndex* pindexNew, const FlatFilePos& pos) EXCLUSIVE_LOCKS_REQUIRED(cs_main);

    [[nodiscard]] MempoolAcceptResult ProcessTransaction(const CTransactionRef& tx, bool test_accept=false)
        EXCLUSIVE_LOCKS_REQUIRED(cs_main);

    bool LoadBlockIndex() EXCLUSIVE_LOCKS_REQUIRED(cs_main);

    void MaybeRebalanceCaches() EXCLUSIVE_LOCKS_REQUIRED(::cs_main);

    void UpdateUncommittedBlockStructures(CBlock& block, const CBlockIndex* pindexPrev) const;

    std::vector<unsigned char> GenerateCoinbaseCommitment(CBlock& block, const CBlockIndex* pindexPrev) const;

    void ReportHeadersPresync(const arith_uint256& work, int64_t height, int64_t timestamp);

    bool DetectSnapshotChainstate() EXCLUSIVE_LOCKS_REQUIRED(::cs_main);

    void ResetChainstates() EXCLUSIVE_LOCKS_REQUIRED(::cs_main);

    [[nodiscard]] bool DeleteSnapshotChainstate() EXCLUSIVE_LOCKS_REQUIRED(::cs_main);

    Chainstate& ActivateExistingSnapshot(uint256 base_blockhash) EXCLUSIVE_LOCKS_REQUIRED(::cs_main);

    bool ValidatedSnapshotCleanup() EXCLUSIVE_LOCKS_REQUIRED(::cs_main);

    Chainstate& GetChainstateForIndexing() EXCLUSIVE_LOCKS_REQUIRED(::cs_main);

    std::pair<int, int> GetPruneRange(
        const Chainstate& chainstate, int last_height_can_prune) EXCLUSIVE_LOCKS_REQUIRED(::cs_main);

    std::optional<int> GetSnapshotBaseHeight() const EXCLUSIVE_LOCKS_REQUIRED(::cs_main);

    CCheckQueue<CScriptCheck>& GetCheckQueue() { return m_script_check_queue; }

    ~ChainstateManager();
};

template<typename DEP>
bool DeploymentActiveAfter(const CBlockIndex* pindexPrev, const ChainstateManager& chainman, DEP dep)
{
    return DeploymentActiveAfter(pindexPrev, chainman.GetConsensus(), dep, chainman.m_versionbitscache);
}

template<typename DEP>
bool DeploymentActiveAt(const CBlockIndex& index, const ChainstateManager& chainman, DEP dep)
{
    return DeploymentActiveAt(index, chainman.GetConsensus(), dep, chainman.m_versionbitscache);
}

template<typename DEP>
bool DeploymentEnabled(const ChainstateManager& chainman, DEP dep)
{
    return DeploymentEnabled(chainman.GetConsensus(), dep);
}

bool IsBIP30Repeat(const CBlockIndex& block_index);

bool IsBIP30Unspendable(const CBlockIndex& block_index);

#endif // BITCOIN_VALIDATION_H