wallet.h

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2020 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_WALLET_WALLET_H
#define BITCOIN_WALLET_WALLET_H

#include <amount.h>
#include <interfaces/chain.h>
#include <interfaces/handler.h>
#include <outputtype.h>
#include <policy/feerate.h>
#include <psbt.h>
#include <tinyformat.h>
#include <util/message.h>
#include <util/strencodings.h>
#include <util/string.h>
#include <util/system.h>
#include <util/ui_change_type.h>
#include <validationinterface.h>
#include <wallet/coinselection.h>
#include <wallet/crypter.h>
#include <wallet/scriptpubkeyman.h>
#include <wallet/walletdb.h>
#include <wallet/walletutil.h>

#include <algorithm>
#include <atomic>
#include <map>
#include <memory>
#include <set>
#include <stdexcept>
#include <stdint.h>
#include <string>
#include <utility>
#include <vector>

#include <boost/signals2/signal.hpp>

using LoadWalletFn = std::function<void(std::unique_ptr<interfaces::Wallet> wallet)>;

struct bilingual_str;

void UnloadWallet(std::shared_ptr<CWallet>&& wallet);

bool AddWallet(const std::shared_ptr<CWallet>& wallet);
bool RemoveWallet(const std::shared_ptr<CWallet>& wallet);
std::vector<std::shared_ptr<CWallet>> GetWallets();
std::shared_ptr<CWallet> GetWallet(const std::string& name);
std::shared_ptr<CWallet> LoadWallet(interfaces::Chain& chain, const WalletLocation& location, bilingual_str& error, std::vector<bilingual_str>& warnings);
std::unique_ptr<interfaces::Handler> HandleLoadWallet(LoadWalletFn load_wallet);

enum class WalletCreationStatus {
    SUCCESS,
    CREATION_FAILED,
    ENCRYPTION_FAILED
};

WalletCreationStatus CreateWallet(interfaces::Chain& chain, const SecureString& passphrase, uint64_t wallet_creation_flags, const std::string& name, bilingual_str& error, std::vector<bilingual_str>& warnings, std::shared_ptr<CWallet>& result);

constexpr CAmount DEFAULT_PAY_TX_FEE = 0;
static const CAmount DEFAULT_FALLBACK_FEE = 0;
static const CAmount DEFAULT_DISCARD_FEE = 10000;
static const CAmount DEFAULT_TRANSACTION_MINFEE = 1000;
static const CAmount WALLET_INCREMENTAL_RELAY_FEE = 5000;
static const bool DEFAULT_SPEND_ZEROCONF_CHANGE = true;
static const bool DEFAULT_WALLET_REJECT_LONG_CHAINS = false;
static const unsigned int DEFAULT_TX_CONFIRM_TARGET = 6;
static const bool DEFAULT_WALLET_RBF = false;
static const bool DEFAULT_WALLETBROADCAST = true;
static const bool DEFAULT_DISABLE_WALLET = false;
constexpr CAmount DEFAULT_TRANSACTION_MAXFEE{COIN / 10};
constexpr CAmount HIGH_TX_FEE_PER_KB{COIN / 100};
constexpr CAmount HIGH_MAX_TX_FEE{100 * HIGH_TX_FEE_PER_KB};

static constexpr size_t DUMMY_NESTED_P2WPKH_INPUT_SIZE = 91;

class CCoinControl;
class COutput;
class CScript;
class CWalletTx;
struct FeeCalculation;
enum class FeeEstimateMode;
class ReserveDestination;

constexpr OutputType DEFAULT_ADDRESS_TYPE{OutputType::BECH32};

static constexpr uint64_t KNOWN_WALLET_FLAGS =
        WALLET_FLAG_AVOID_REUSE
    |   WALLET_FLAG_BLANK_WALLET
    |   WALLET_FLAG_KEY_ORIGIN_METADATA
    |   WALLET_FLAG_DISABLE_PRIVATE_KEYS
    |   WALLET_FLAG_DESCRIPTORS;

static constexpr uint64_t MUTABLE_WALLET_FLAGS =
        WALLET_FLAG_AVOID_REUSE;

static const std::map<std::string,WalletFlags> WALLET_FLAG_MAP{
    {"avoid_reuse", WALLET_FLAG_AVOID_REUSE},
    {"blank", WALLET_FLAG_BLANK_WALLET},
    {"key_origin_metadata", WALLET_FLAG_KEY_ORIGIN_METADATA},
    {"disable_private_keys", WALLET_FLAG_DISABLE_PRIVATE_KEYS},
    {"descriptor_wallet", WALLET_FLAG_DESCRIPTORS},
};

extern const std::map<uint64_t,std::string> WALLET_FLAG_CAVEATS;

class ReserveDestination
{
protected:
    const CWallet* const pwallet;
    ScriptPubKeyMan* m_spk_man{nullptr};
    OutputType const type;
    int64_t nIndex{-1};
    CTxDestination address;
    bool fInternal{false};

public:
    explicit ReserveDestination(CWallet* pwallet, OutputType type)
      : pwallet(pwallet)
      , type(type) { }

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

    ~ReserveDestination()
    {
        ReturnDestination();
    }

    bool GetReservedDestination(CTxDestination& pubkey, bool internal);
    void ReturnDestination();
    void KeepDestination();
};

class CAddressBookData
{
private:
    bool m_change{true};
    std::string m_label;
public:
    std::string purpose;

    CAddressBookData() : purpose("unknown") {}

    typedef std::map<std::string, std::string> StringMap;
    StringMap destdata;

    bool IsChange() const { return m_change; }
    const std::string& GetLabel() const { return m_label; }
    void SetLabel(const std::string& label) {
        m_change = false;
        m_label = label;
    }
};

struct CRecipient
{
    CScript scriptPubKey;
    CAmount nAmount;
    bool fSubtractFeeFromAmount;
};

typedef std::map<std::string, std::string> mapValue_t;


static inline void ReadOrderPos(int64_t& nOrderPos, mapValue_t& mapValue)
{
    if (!mapValue.count("n"))
    {
        nOrderPos = -1; // TODO: calculate elsewhere
        return;
    }
    nOrderPos = atoi64(mapValue["n"].c_str());
}


static inline void WriteOrderPos(const int64_t& nOrderPos, mapValue_t& mapValue)
{
    if (nOrderPos == -1)
        return;
    mapValue["n"] = ToString(nOrderPos);
}

struct COutputEntry
{
    CTxDestination destination;
    CAmount amount;
    int vout;
};

class CMerkleTx
{
public:
    template<typename Stream>
    void Unserialize(Stream& s)
    {
        CTransactionRef tx;
        uint256 hashBlock;
        std::vector<uint256> vMerkleBranch;
        int nIndex;

        s >> tx >> hashBlock >> vMerkleBranch >> nIndex;
    }
};

//Get the marginal bytes of spending the specified output
int CalculateMaximumSignedInputSize(const CTxOut& txout, const CWallet* pwallet, bool use_max_sig = false);

class CWalletTx
{
private:
    const CWallet* pwallet;

    static const uint256 ABANDON_HASH;

public:
    mapValue_t mapValue;
    std::vector<std::pair<std::string, std::string> > vOrderForm;
    unsigned int fTimeReceivedIsTxTime;
    unsigned int nTimeReceived; 

    unsigned int nTimeSmart;
    bool fFromMe;
    int64_t nOrderPos; 
    std::multimap<int64_t, CWalletTx*>::const_iterator m_it_wtxOrdered;

    // memory only
    enum AmountType { DEBIT, CREDIT, IMMATURE_CREDIT, AVAILABLE_CREDIT, AMOUNTTYPE_ENUM_ELEMENTS };
    CAmount GetCachableAmount(AmountType type, const isminefilter& filter, bool recalculate = false) const;
    mutable CachableAmount m_amounts[AMOUNTTYPE_ENUM_ELEMENTS];
    mutable bool m_is_cache_empty{true};
    mutable bool fChangeCached;
    mutable bool fInMempool;
    mutable CAmount nChangeCached;

    CWalletTx(const CWallet* wallet, CTransactionRef arg)
        : pwallet(wallet),
          tx(std::move(arg))
    {
        Init();
    }

    void Init()
    {
        mapValue.clear();
        vOrderForm.clear();
        fTimeReceivedIsTxTime = false;
        nTimeReceived = 0;
        nTimeSmart = 0;
        fFromMe = false;
        fChangeCached = false;
        fInMempool = false;
        nChangeCached = 0;
        nOrderPos = -1;
        m_confirm = Confirmation{};
    }

    CTransactionRef tx;

    /* New transactions start as UNCONFIRMED. At BlockConnected,
     * they will transition to CONFIRMED. In case of reorg, at BlockDisconnected,
     * they roll back to UNCONFIRMED. If we detect a conflicting transaction at
     * block connection, we update conflicted tx and its dependencies as CONFLICTED.
     * If tx isn't confirmed and outside of mempool, the user may switch it to ABANDONED
     * by using the abandontransaction call. This last status may be override by a CONFLICTED
     * or CONFIRMED transition.
     */
    enum Status {
        UNCONFIRMED,
        CONFIRMED,
        CONFLICTED,
        ABANDONED
    };

    /* Confirmation includes tx status and a triplet of {block height/block hash/tx index in block}
     * at which tx has been confirmed. All three are set to 0 if tx is unconfirmed or abandoned.
     * Meaning of these fields changes with CONFLICTED state where they instead point to block hash
     * and block height of the deepest conflicting tx.
     */
    struct Confirmation {
        Status status;
        int block_height;
        uint256 hashBlock;
        int nIndex;
        Confirmation(Status s = UNCONFIRMED, int b = 0, uint256 h = uint256(), int i = 0) : status(s), block_height(b), hashBlock(h), nIndex(i) {}
    };

    Confirmation m_confirm;

    template<typename Stream>
    void Serialize(Stream& s) const
    {
        mapValue_t mapValueCopy = mapValue;

        mapValueCopy["fromaccount"] = "";
        WriteOrderPos(nOrderPos, mapValueCopy);
        if (nTimeSmart) {
            mapValueCopy["timesmart"] = strprintf("%u", nTimeSmart);
        }

        std::vector<char> dummy_vector1; 
        std::vector<char> dummy_vector2; 
        bool dummy_bool = false; 
        uint256 serializedHash = isAbandoned() ? ABANDON_HASH : m_confirm.hashBlock;
        int serializedIndex = isAbandoned() || isConflicted() ? -1 : m_confirm.nIndex;
        s << tx << serializedHash << dummy_vector1 << serializedIndex << dummy_vector2 << mapValueCopy << vOrderForm << fTimeReceivedIsTxTime << nTimeReceived << fFromMe << dummy_bool;
    }

    template<typename Stream>
    void Unserialize(Stream& s)
    {
        Init();

        std::vector<uint256> dummy_vector1; 
        std::vector<CMerkleTx> dummy_vector2; 
        bool dummy_bool; 
        int serializedIndex;
        s >> tx >> m_confirm.hashBlock >> dummy_vector1 >> serializedIndex >> dummy_vector2 >> mapValue >> vOrderForm >> fTimeReceivedIsTxTime >> nTimeReceived >> fFromMe >> dummy_bool;

        /* At serialization/deserialization, an nIndex == -1 means that hashBlock refers to
         * the earliest block in the chain we know this or any in-wallet ancestor conflicts
         * with. If nIndex == -1 and hashBlock is ABANDON_HASH, it means transaction is abandoned.
         * In same context, an nIndex >= 0 refers to a confirmed transaction (if hashBlock set) or
         * unconfirmed one. Older clients interpret nIndex == -1 as unconfirmed for backward
         * compatibility (pre-commit 9ac63d6).
         */
        if (serializedIndex == -1 && m_confirm.hashBlock == ABANDON_HASH) {
            setAbandoned();
        } else if (serializedIndex == -1) {
            setConflicted();
        } else if (!m_confirm.hashBlock.IsNull()) {
            m_confirm.nIndex = serializedIndex;
            setConfirmed();
        }

        ReadOrderPos(nOrderPos, mapValue);
        nTimeSmart = mapValue.count("timesmart") ? (unsigned int)atoi64(mapValue["timesmart"]) : 0;

        mapValue.erase("fromaccount");
        mapValue.erase("spent");
        mapValue.erase("n");
        mapValue.erase("timesmart");
    }

    void SetTx(CTransactionRef arg)
    {
        tx = std::move(arg);
    }

    void MarkDirty()
    {
        m_amounts[DEBIT].Reset();
        m_amounts[CREDIT].Reset();
        m_amounts[IMMATURE_CREDIT].Reset();
        m_amounts[AVAILABLE_CREDIT].Reset();
        fChangeCached = false;
        m_is_cache_empty = true;
    }

    CAmount GetDebit(const isminefilter& filter) const;
    CAmount GetCredit(const isminefilter& filter) const;
    CAmount GetImmatureCredit(bool fUseCache = true) const;
    // TODO: Remove "NO_THREAD_SAFETY_ANALYSIS" and replace it with the correct
    // annotation "EXCLUSIVE_LOCKS_REQUIRED(pwallet->cs_wallet)". The
    // annotation "NO_THREAD_SAFETY_ANALYSIS" was temporarily added to avoid
    // having to resolve the issue of member access into incomplete type CWallet.
    CAmount GetAvailableCredit(bool fUseCache = true, const isminefilter& filter = ISMINE_SPENDABLE) const NO_THREAD_SAFETY_ANALYSIS;
    CAmount GetImmatureWatchOnlyCredit(const bool fUseCache = true) const;
    CAmount GetChange() const;

    // Get the marginal bytes if spending the specified output from this transaction
    int GetSpendSize(unsigned int out, bool use_max_sig = false) const
    {
        return CalculateMaximumSignedInputSize(tx->vout[out], pwallet, use_max_sig);
    }

    void GetAmounts(std::list<COutputEntry>& listReceived,
                    std::list<COutputEntry>& listSent, CAmount& nFee, const isminefilter& filter) const;

    bool IsFromMe(const isminefilter& filter) const
    {
        return (GetDebit(filter) > 0);
    }

    // True if only scriptSigs are different
    bool IsEquivalentTo(const CWalletTx& tx) const;

    bool InMempool() const;
    bool IsTrusted() const;
    bool IsTrusted(std::set<uint256>& trusted_parents) const;

    int64_t GetTxTime() const;

    // Pass this transaction to node for mempool insertion and relay to peers if flag set to true
    bool SubmitMemoryPoolAndRelay(std::string& err_string, bool relay);

    // TODO: Remove "NO_THREAD_SAFETY_ANALYSIS" and replace it with the correct
    // annotation "EXCLUSIVE_LOCKS_REQUIRED(pwallet->cs_wallet)". The annotation
    // "NO_THREAD_SAFETY_ANALYSIS" was temporarily added to avoid having to
    // resolve the issue of member access into incomplete type CWallet. Note
    // that we still have the runtime check "AssertLockHeld(pwallet->cs_wallet)"
    // in place.
    std::set<uint256> GetConflicts() const NO_THREAD_SAFETY_ANALYSIS;

    // TODO: Remove "NO_THREAD_SAFETY_ANALYSIS" and replace it with the correct
    // annotation "EXCLUSIVE_LOCKS_REQUIRED(pwallet->cs_wallet)". The annotation
    // "NO_THREAD_SAFETY_ANALYSIS" was temporarily added to avoid having to
    // resolve the issue of member access into incomplete type CWallet. Note
    // that we still have the runtime check "AssertLockHeld(pwallet->cs_wallet)"
    // in place.
    int GetDepthInMainChain() const NO_THREAD_SAFETY_ANALYSIS;
    bool IsInMainChain() const { return GetDepthInMainChain() > 0; }

    int GetBlocksToMaturity() const;
    bool isAbandoned() const { return m_confirm.status == CWalletTx::ABANDONED; }
    void setAbandoned()
    {
        m_confirm.status = CWalletTx::ABANDONED;
        m_confirm.hashBlock = uint256();
        m_confirm.block_height = 0;
        m_confirm.nIndex = 0;
    }
    bool isConflicted() const { return m_confirm.status == CWalletTx::CONFLICTED; }
    void setConflicted() { m_confirm.status = CWalletTx::CONFLICTED; }
    bool isUnconfirmed() const { return m_confirm.status == CWalletTx::UNCONFIRMED; }
    void setUnconfirmed() { m_confirm.status = CWalletTx::UNCONFIRMED; }
    bool isConfirmed() const { return m_confirm.status == CWalletTx::CONFIRMED; }
    void setConfirmed() { m_confirm.status = CWalletTx::CONFIRMED; }
    const uint256& GetHash() const { return tx->GetHash(); }
    bool IsCoinBase() const { return tx->IsCoinBase(); }
    bool IsImmatureCoinBase() const;

    // Disable copying of CWalletTx objects to prevent bugs where instances get
    // copied in and out of the mapWallet map, and fields are updated in the
    // wrong copy.
    CWalletTx(CWalletTx const &) = delete;
    void operator=(CWalletTx const &x) = delete;
};

class COutput
{
public:
    const CWalletTx *tx;
    int i;
    int nDepth;

    int nInputBytes;

    bool fSpendable;

    bool fSolvable;

    bool use_max_sig;

    bool fSafe;

    COutput(const CWalletTx *txIn, int iIn, int nDepthIn, bool fSpendableIn, bool fSolvableIn, bool fSafeIn, bool use_max_sig_in = false)
    {
        tx = txIn; i = iIn; nDepth = nDepthIn; fSpendable = fSpendableIn; fSolvable = fSolvableIn; fSafe = fSafeIn; nInputBytes = -1; use_max_sig = use_max_sig_in;
        // If known and signable by the given wallet, compute nInputBytes
        // Failure will keep this value -1
        if (fSpendable && tx) {
            nInputBytes = tx->GetSpendSize(i, use_max_sig);
        }
    }

    std::string ToString() const;

    inline CInputCoin GetInputCoin() const
    {
        return CInputCoin(tx->tx, i, nInputBytes);
    }
};

struct CoinSelectionParams
{
    bool use_bnb = true;
    size_t change_output_size = 0;
    size_t change_spend_size = 0;
    CFeeRate effective_fee = CFeeRate(0);
    size_t tx_noinputs_size = 0;
    bool m_subtract_fee_outputs = false;

    CoinSelectionParams(bool use_bnb, size_t change_output_size, size_t change_spend_size, CFeeRate effective_fee, size_t tx_noinputs_size) : use_bnb(use_bnb), change_output_size(change_output_size), change_spend_size(change_spend_size), effective_fee(effective_fee), tx_noinputs_size(tx_noinputs_size) {}
    CoinSelectionParams() {}
};

class WalletRescanReserver; //forward declarations for ScanForWalletTransactions/RescanFromTime
class CWallet final : public WalletStorage, public interfaces::Chain::Notifications
{
private:
    CKeyingMaterial vMasterKey GUARDED_BY(cs_wallet);


    bool Unlock(const CKeyingMaterial& vMasterKeyIn, bool accept_no_keys = false);

    std::atomic<bool> fAbortRescan{false};
    std::atomic<bool> fScanningWallet{false}; // controlled by WalletRescanReserver
    std::atomic<int64_t> m_scanning_start{0};
    std::atomic<double> m_scanning_progress{0};
    friend class WalletRescanReserver;

    int nWalletVersion GUARDED_BY(cs_wallet){FEATURE_BASE};

    int nWalletMaxVersion GUARDED_BY(cs_wallet) = FEATURE_BASE;

    int64_t nNextResend = 0;
    bool fBroadcastTransactions = false;
    // Local time that the tip block was received. Used to schedule wallet rebroadcasts.
    std::atomic<int64_t> m_best_block_time {0};

    typedef std::multimap<COutPoint, uint256> TxSpends;
    TxSpends mapTxSpends GUARDED_BY(cs_wallet);
    void AddToSpends(const COutPoint& outpoint, const uint256& wtxid) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
    void AddToSpends(const uint256& wtxid) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);

    bool AddToWalletIfInvolvingMe(const CTransactionRef& tx, CWalletTx::Confirmation confirm, bool fUpdate) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);

    /* Mark a transaction (and its in-wallet descendants) as conflicting with a particular block. */
    void MarkConflicted(const uint256& hashBlock, int conflicting_height, const uint256& hashTx);

    /* Mark a transaction's inputs dirty, thus forcing the outputs to be recomputed */
    void MarkInputsDirty(const CTransactionRef& tx) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);

    void SyncMetaData(std::pair<TxSpends::iterator, TxSpends::iterator>) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);

    /* Used by TransactionAddedToMemorypool/BlockConnected/Disconnected/ScanForWalletTransactions.
     * Should be called with non-zero block_hash and posInBlock if this is for a transaction that is included in a block. */
    void SyncTransaction(const CTransactionRef& tx, CWalletTx::Confirmation confirm, bool update_tx = true) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);

    std::atomic<uint64_t> m_wallet_flags{0};

    bool SetAddressBookWithDB(WalletBatch& batch, const CTxDestination& address, const std::string& strName, const std::string& strPurpose);

    void UnsetWalletFlagWithDB(WalletBatch& batch, uint64_t flag);

    void UnsetBlankWalletFlag(WalletBatch& batch) override;

    interfaces::Chain* m_chain;

    WalletLocation m_location;

    std::unique_ptr<WalletDatabase> database;

    uint256 m_last_block_processed GUARDED_BY(cs_wallet);

    /* Height of last block processed is used by wallet to know depth of transactions
     * without relying on Chain interface beyond asynchronous updates. For safety, we
     * initialize it to -1. Height is a pointer on node's tip and doesn't imply
     * that the wallet has scanned sequentially all blocks up to this one.
     */
    int m_last_block_processed_height GUARDED_BY(cs_wallet) = -1;

    std::map<OutputType, ScriptPubKeyMan*> m_external_spk_managers;
    std::map<OutputType, ScriptPubKeyMan*> m_internal_spk_managers;

    // Indexed by a unique identifier produced by each ScriptPubKeyMan using
    // ScriptPubKeyMan::GetID. In many cases it will be the hash of an internal structure
    std::map<uint256, std::unique_ptr<ScriptPubKeyMan>> m_spk_managers;

public:
    /*
     * Main wallet lock.
     * This lock protects all the fields added by CWallet.
     */
    mutable RecursiveMutex cs_wallet;

    WalletDatabase& GetDBHandle()
    {
        return *database;
    }
    WalletDatabase& GetDatabase() override { return *database; }

    bool SelectCoins(const std::vector<COutput>& vAvailableCoins, const CAmount& nTargetValue, std::set<CInputCoin>& setCoinsRet, CAmount& nValueRet,
                    const CCoinControl& coin_control, CoinSelectionParams& coin_selection_params, bool& bnb_used) const EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);

    const WalletLocation& GetLocation() const { return m_location; }

    const std::string& GetName() const { return m_location.GetName(); }

    typedef std::map<unsigned int, CMasterKey> MasterKeyMap;
    MasterKeyMap mapMasterKeys;
    unsigned int nMasterKeyMaxID = 0;

    CWallet(interfaces::Chain* chain, const WalletLocation& location, std::unique_ptr<WalletDatabase> database)
        : m_chain(chain),
          m_location(location),
          database(std::move(database))
    {
    }

    ~CWallet()
    {
        // Should not have slots connected at this point.
        assert(NotifyUnload.empty());
    }

    bool IsCrypted() const;
    bool IsLocked() const override;
    bool Lock();

    bool HaveChain() const { return m_chain ? true : false; }

    std::map<uint256, CWalletTx> mapWallet GUARDED_BY(cs_wallet);

    typedef std::multimap<int64_t, CWalletTx*> TxItems;
    TxItems wtxOrdered;

    int64_t nOrderPosNext GUARDED_BY(cs_wallet) = 0;
    uint64_t nAccountingEntryNumber = 0;

    std::map<CTxDestination, CAddressBookData> m_address_book GUARDED_BY(cs_wallet);
    const CAddressBookData* FindAddressBookEntry(const CTxDestination&, bool allow_change = false) const EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);

    std::set<COutPoint> setLockedCoins GUARDED_BY(cs_wallet);

    std::unique_ptr<interfaces::Handler> m_chain_notifications_handler;

    interfaces::Chain& chain() const { assert(m_chain); return *m_chain; }

    const CWalletTx* GetWalletTx(const uint256& hash) const;

    bool CanSupportFeature(enum WalletFeature wf) const override EXCLUSIVE_LOCKS_REQUIRED(cs_wallet) { AssertLockHeld(cs_wallet); return nWalletMaxVersion >= wf; }

    void AvailableCoins(std::vector<COutput>& vCoins, bool fOnlySafe = true, const CCoinControl* coinControl = nullptr, const CAmount& nMinimumAmount = 1, const CAmount& nMaximumAmount = MAX_MONEY, const CAmount& nMinimumSumAmount = MAX_MONEY, const uint64_t nMaximumCount = 0) const EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);

    std::map<CTxDestination, std::vector<COutput>> ListCoins() const EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);

    const CTxOut& FindNonChangeParentOutput(const CTransaction& tx, int output) const EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);

    bool SelectCoinsMinConf(const CAmount& nTargetValue, const CoinEligibilityFilter& eligibility_filter, std::vector<OutputGroup> groups,
        std::set<CInputCoin>& setCoinsRet, CAmount& nValueRet, const CoinSelectionParams& coin_selection_params, bool& bnb_used) const;

    bool IsSpent(const uint256& hash, unsigned int n) const EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);

    // Whether this or any known UTXO with the same single key has been spent.
    bool IsSpentKey(const uint256& hash, unsigned int n) const EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
    void SetSpentKeyState(WalletBatch& batch, const uint256& hash, unsigned int n, bool used, std::set<CTxDestination>& tx_destinations) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);

    std::vector<OutputGroup> GroupOutputs(const std::vector<COutput>& outputs, bool single_coin, const size_t max_ancestors) const;

    bool IsLockedCoin(uint256 hash, unsigned int n) const EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
    void LockCoin(const COutPoint& output) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
    void UnlockCoin(const COutPoint& output) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
    void UnlockAllCoins() EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
    void ListLockedCoins(std::vector<COutPoint>& vOutpts) const EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);

    /*
     * Rescan abort properties
     */
    void AbortRescan() { fAbortRescan = true; }
    bool IsAbortingRescan() const { return fAbortRescan; }
    bool IsScanning() const { return fScanningWallet; }
    int64_t ScanningDuration() const { return fScanningWallet ? GetTimeMillis() - m_scanning_start : 0; }
    double ScanningProgress() const { return fScanningWallet ? (double) m_scanning_progress : 0; }

    void UpgradeKeyMetadata() EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);

    bool LoadMinVersion(int nVersion) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet) { AssertLockHeld(cs_wallet); nWalletVersion = nVersion; nWalletMaxVersion = std::max(nWalletMaxVersion, nVersion); return true; }

    bool AddDestData(WalletBatch& batch, const CTxDestination& dest, const std::string& key, const std::string& value) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
    bool EraseDestData(WalletBatch& batch, const CTxDestination& dest, const std::string& key) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
    void LoadDestData(const CTxDestination& dest, const std::string& key, const std::string& value) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
    bool GetDestData(const CTxDestination& dest, const std::string& key, std::string* value) const EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
    std::vector<std::string> GetDestValues(const std::string& prefix) const EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);

    int64_t nRelockTime GUARDED_BY(cs_wallet){0};

    // Used to prevent concurrent calls to walletpassphrase RPC.
    Mutex m_unlock_mutex;
    bool Unlock(const SecureString& strWalletPassphrase, bool accept_no_keys = false);
    bool ChangeWalletPassphrase(const SecureString& strOldWalletPassphrase, const SecureString& strNewWalletPassphrase);
    bool EncryptWallet(const SecureString& strWalletPassphrase);

    void GetKeyBirthTimes(std::map<CKeyID, int64_t> &mapKeyBirth) const EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
    unsigned int ComputeTimeSmart(const CWalletTx& wtx) const;

    int64_t IncOrderPosNext(WalletBatch *batch = nullptr) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
    DBErrors ReorderTransactions();

    void MarkDirty();

    using UpdateWalletTxFn = std::function<bool(CWalletTx& wtx, bool new_tx)>;

    CWalletTx* AddToWallet(CTransactionRef tx, const CWalletTx::Confirmation& confirm, const UpdateWalletTxFn& update_wtx=nullptr, bool fFlushOnClose=true);
    bool LoadToWallet(const uint256& hash, const UpdateWalletTxFn& fill_wtx) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
    void transactionAddedToMempool(const CTransactionRef& tx) override;
    void blockConnected(const CBlock& block, int height) override;
    void blockDisconnected(const CBlock& block, int height) override;
    void updatedBlockTip() override;
    int64_t RescanFromTime(int64_t startTime, const WalletRescanReserver& reserver, bool update);

    struct ScanResult {
        enum { SUCCESS, FAILURE, USER_ABORT } status = SUCCESS;

        uint256 last_scanned_block;
        Optional<int> last_scanned_height;

        uint256 last_failed_block;
    };
    ScanResult ScanForWalletTransactions(const uint256& start_block, int start_height, Optional<int> max_height, const WalletRescanReserver& reserver, bool fUpdate);
    void transactionRemovedFromMempool(const CTransactionRef& tx, MemPoolRemovalReason reason) override;
    void ReacceptWalletTransactions() EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
    void ResendWalletTransactions();
    struct Balance {
        CAmount m_mine_trusted{0};           
        CAmount m_mine_untrusted_pending{0}; 
        CAmount m_mine_immature{0};          
        CAmount m_watchonly_trusted{0};
        CAmount m_watchonly_untrusted_pending{0};
        CAmount m_watchonly_immature{0};
    };
    Balance GetBalance(int min_depth = 0, bool avoid_reuse = true) const;
    CAmount GetAvailableBalance(const CCoinControl* coinControl = nullptr) const;

    OutputType TransactionChangeType(const Optional<OutputType>& change_type, const std::vector<CRecipient>& vecSend);

    bool FundTransaction(CMutableTransaction& tx, CAmount& nFeeRet, int& nChangePosInOut, bilingual_str& error, bool lockUnspents, const std::set<int>& setSubtractFeeFromOutputs, CCoinControl);
    // Fetch the inputs and sign with SIGHASH_ALL.
    bool SignTransaction(CMutableTransaction& tx) const EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
    // Sign the tx given the input coins and sighash.
    bool SignTransaction(CMutableTransaction& tx, const std::map<COutPoint, Coin>& coins, int sighash, std::map<int, std::string>& input_errors) const;
    SigningResult SignMessage(const std::string& message, const PKHash& pkhash, std::string& str_sig) const;

    TransactionError FillPSBT(PartiallySignedTransaction& psbtx,
                  bool& complete,
                  int sighash_type = 1 /* SIGHASH_ALL */,
                  bool sign = true,
                  bool bip32derivs = true,
                  size_t* n_signed = nullptr) const;

    bool CreateTransaction(const std::vector<CRecipient>& vecSend, CTransactionRef& tx, CAmount& nFeeRet, int& nChangePosInOut, bilingual_str& error, const CCoinControl& coin_control, bool sign = true);
    void CommitTransaction(CTransactionRef tx, mapValue_t mapValue, std::vector<std::pair<std::string, std::string>> orderForm);

    bool DummySignTx(CMutableTransaction &txNew, const std::set<CTxOut> &txouts, bool use_max_sig = false) const
    {
        std::vector<CTxOut> v_txouts(txouts.size());
        std::copy(txouts.begin(), txouts.end(), v_txouts.begin());
        return DummySignTx(txNew, v_txouts, use_max_sig);
    }
    bool DummySignTx(CMutableTransaction &txNew, const std::vector<CTxOut> &txouts, bool use_max_sig = false) const;
    bool DummySignInput(CTxIn &tx_in, const CTxOut &txout, bool use_max_sig = false) const;

    bool ImportScripts(const std::set<CScript> scripts, int64_t timestamp) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
    bool ImportPrivKeys(const std::map<CKeyID, CKey>& privkey_map, const int64_t timestamp) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
    bool ImportPubKeys(const std::vector<CKeyID>& ordered_pubkeys, const std::map<CKeyID, CPubKey>& pubkey_map, const std::map<CKeyID, std::pair<CPubKey, KeyOriginInfo>>& key_origins, const bool add_keypool, const bool internal, const int64_t timestamp) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
    bool ImportScriptPubKeys(const std::string& label, const std::set<CScript>& script_pub_keys, const bool have_solving_data, const bool apply_label, const int64_t timestamp) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);

    CFeeRate m_pay_tx_fee{DEFAULT_PAY_TX_FEE};
    unsigned int m_confirm_target{DEFAULT_TX_CONFIRM_TARGET};
    bool m_spend_zero_conf_change{DEFAULT_SPEND_ZEROCONF_CHANGE};
    bool m_signal_rbf{DEFAULT_WALLET_RBF};
    bool m_allow_fallback_fee{true}; 
    CFeeRate m_min_fee{DEFAULT_TRANSACTION_MINFEE}; 

    CFeeRate m_fallback_fee{DEFAULT_FALLBACK_FEE};
    CFeeRate m_discard_rate{DEFAULT_DISCARD_FEE};
    OutputType m_default_address_type{DEFAULT_ADDRESS_TYPE};
    Optional<OutputType> m_default_change_type{};
    CAmount m_default_max_tx_fee{DEFAULT_TRANSACTION_MAXFEE};

    size_t KeypoolCountExternalKeys() const EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
    bool TopUpKeyPool(unsigned int kpSize = 0);

    int64_t GetOldestKeyPoolTime() const;

    std::set<std::set<CTxDestination>> GetAddressGroupings() const EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);
    std::map<CTxDestination, CAmount> GetAddressBalances() const;

    std::set<CTxDestination> GetLabelAddresses(const std::string& label) const;

    void MarkDestinationsDirty(const std::set<CTxDestination>& destinations) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);

    bool GetNewDestination(const OutputType type, const std::string label, CTxDestination& dest, std::string& error);
    bool GetNewChangeDestination(const OutputType type, CTxDestination& dest, std::string& error);

    isminetype IsMine(const CTxDestination& dest) const;
    isminetype IsMine(const CScript& script) const;
    isminetype IsMine(const CTxIn& txin) const;
    CAmount GetDebit(const CTxIn& txin, const isminefilter& filter) const;
    isminetype IsMine(const CTxOut& txout) const;
    CAmount GetCredit(const CTxOut& txout, const isminefilter& filter) const;
    bool IsChange(const CTxOut& txout) const;
    bool IsChange(const CScript& script) const;
    CAmount GetChange(const CTxOut& txout) const;
    bool IsMine(const CTransaction& tx) const;
    bool IsFromMe(const CTransaction& tx) const;
    CAmount GetDebit(const CTransaction& tx, const isminefilter& filter) const;
    bool IsAllFromMe(const CTransaction& tx, const isminefilter& filter) const;
    CAmount GetCredit(const CTransaction& tx, const isminefilter& filter) const;
    CAmount GetChange(const CTransaction& tx) const;
    void chainStateFlushed(const CBlockLocator& loc) override;

    DBErrors LoadWallet(bool& fFirstRunRet);
    DBErrors ZapWalletTx(std::list<CWalletTx>& vWtx);
    DBErrors ZapSelectTx(std::vector<uint256>& vHashIn, std::vector<uint256>& vHashOut) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);

    bool SetAddressBook(const CTxDestination& address, const std::string& strName, const std::string& purpose);

    bool DelAddressBook(const CTxDestination& address);

    unsigned int GetKeyPoolSize() const EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);

    void SetMinVersion(enum WalletFeature, WalletBatch* batch_in = nullptr, bool fExplicit = false) override;

    bool SetMaxVersion(int nVersion);

    int GetVersion() const { LOCK(cs_wallet); return nWalletVersion; }

    std::set<uint256> GetConflicts(const uint256& txid) const EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);

    bool HasWalletSpend(const uint256& txid) const EXCLUSIVE_LOCKS_REQUIRED(cs_wallet);

    void Flush();

    void Close();

    boost::signals2::signal<void ()> NotifyUnload;

    boost::signals2::signal<void (CWallet *wallet, const CTxDestination
            &address, const std::string &label, bool isMine,
            const std::string &purpose,
            ChangeType status)> NotifyAddressBookChanged;

    boost::signals2::signal<void (CWallet *wallet, const uint256 &hashTx,
            ChangeType status)> NotifyTransactionChanged;

    boost::signals2::signal<void (const std::string &title, int nProgress)> ShowProgress;

    boost::signals2::signal<void (bool fHaveWatchOnly)> NotifyWatchonlyChanged;

    boost::signals2::signal<void ()> NotifyCanGetAddressesChanged;

    boost::signals2::signal<void (CWallet* wallet)> NotifyStatusChanged;

    bool GetBroadcastTransactions() const { return fBroadcastTransactions; }
    void SetBroadcastTransactions(bool broadcast) { fBroadcastTransactions = broadcast; }

    bool TransactionCanBeAbandoned(const uint256& hashTx) const;

    /* Mark a transaction (and it in-wallet descendants) as abandoned so its inputs may be respent. */
    bool AbandonTransaction(const uint256& hashTx);

    bool MarkReplaced(const uint256& originalHash, const uint256& newHash);

    static bool Verify(interfaces::Chain& chain, const WalletLocation& location, bilingual_str& error_string, std::vector<bilingual_str>& warnings);

    /* Initializes the wallet, returns a new CWallet instance or a null pointer in case of an error */
    static std::shared_ptr<CWallet> CreateWalletFromFile(interfaces::Chain& chain, const WalletLocation& location, bilingual_str& error, std::vector<bilingual_str>& warnings, uint64_t wallet_creation_flags = 0);

    void postInitProcess();

    bool BackupWallet(const std::string& strDest) const;

    /* Returns true if HD is enabled */
    bool IsHDEnabled() const;

    /* Returns true if the wallet can give out new addresses. This means it has keys in the keypool or can generate new keys */
    bool CanGetAddresses(bool internal = false) const;

    void BlockUntilSyncedToCurrentChain() const LOCKS_EXCLUDED(cs_main, cs_wallet);

    void SetWalletFlag(uint64_t flags);

    void UnsetWalletFlag(uint64_t flag);

    bool IsWalletFlagSet(uint64_t flag) const override;

    bool AddWalletFlags(uint64_t flags);
    bool LoadWalletFlags(uint64_t flags);

    bool IsLegacy() const;

    const std::string GetDisplayName() const override {
        std::string wallet_name = GetName().length() == 0 ? "default wallet" : GetName();
        return strprintf("[%s]", wallet_name);
    };

    template<typename... Params>
    void WalletLogPrintf(std::string fmt, Params... parameters) const {
        LogPrintf(("%s " + fmt).c_str(), GetDisplayName(), parameters...);
    };

    bool UpgradeWallet(int version, bilingual_str& error, std::vector<bilingual_str>& warnings);

    std::set<ScriptPubKeyMan*> GetActiveScriptPubKeyMans() const;

    std::set<ScriptPubKeyMan*> GetAllScriptPubKeyMans() const;

    ScriptPubKeyMan* GetScriptPubKeyMan(const OutputType& type, bool internal) const;

    ScriptPubKeyMan* GetScriptPubKeyMan(const CScript& script) const;
    ScriptPubKeyMan* GetScriptPubKeyMan(const uint256& id) const;

    std::set<ScriptPubKeyMan*> GetScriptPubKeyMans(const CScript& script, SignatureData& sigdata) const;

    std::unique_ptr<SigningProvider> GetSolvingProvider(const CScript& script) const;
    std::unique_ptr<SigningProvider> GetSolvingProvider(const CScript& script, SignatureData& sigdata) const;

    LegacyScriptPubKeyMan* GetLegacyScriptPubKeyMan() const;
    LegacyScriptPubKeyMan* GetOrCreateLegacyScriptPubKeyMan();

    void SetupLegacyScriptPubKeyMan();

    const CKeyingMaterial& GetEncryptionKey() const override;
    bool HasEncryptionKeys() const override;

    int GetLastBlockHeight() const EXCLUSIVE_LOCKS_REQUIRED(cs_wallet)
    {
        AssertLockHeld(cs_wallet);
        assert(m_last_block_processed_height >= 0);
        return m_last_block_processed_height;
    };
    uint256 GetLastBlockHash() const EXCLUSIVE_LOCKS_REQUIRED(cs_wallet)
    {
        AssertLockHeld(cs_wallet);
        assert(m_last_block_processed_height >= 0);
        return m_last_block_processed;
    }
    void SetLastBlockProcessed(int block_height, uint256 block_hash) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet)
    {
        AssertLockHeld(cs_wallet);
        m_last_block_processed_height = block_height;
        m_last_block_processed = block_hash;
    };

    void ConnectScriptPubKeyManNotifiers();

    void LoadDescriptorScriptPubKeyMan(uint256 id, WalletDescriptor& desc);

    void AddActiveScriptPubKeyMan(uint256 id, OutputType type, bool internal);

    void LoadActiveScriptPubKeyMan(uint256 id, OutputType type, bool internal);

    void SetupDescriptorScriptPubKeyMans();

    DescriptorScriptPubKeyMan* GetDescriptorScriptPubKeyMan(const WalletDescriptor& desc) const;

    ScriptPubKeyMan* AddWalletDescriptor(WalletDescriptor& desc, const FlatSigningProvider& signing_provider, const std::string& label);
};

void MaybeResendWalletTxs();

class WalletRescanReserver
{
private:
    CWallet& m_wallet;
    bool m_could_reserve;
public:
    explicit WalletRescanReserver(CWallet& w) : m_wallet(w), m_could_reserve(false) {}

    bool reserve()
    {
        assert(!m_could_reserve);
        if (m_wallet.fScanningWallet.exchange(true)) {
            return false;
        }
        m_wallet.m_scanning_start = GetTimeMillis();
        m_wallet.m_scanning_progress = 0;
        m_could_reserve = true;
        return true;
    }

    bool isReserved() const
    {
        return (m_could_reserve && m_wallet.fScanningWallet);
    }

    ~WalletRescanReserver()
    {
        if (m_could_reserve) {
            m_wallet.fScanningWallet = false;
        }
    }
};

// Calculate the size of the transaction assuming all signatures are max size
// Use DummySignatureCreator, which inserts 71 byte signatures everywhere.
// NOTE: this requires that all inputs must be in mapWallet (eg the tx should
// be IsAllFromMe).
int64_t CalculateMaximumSignedTxSize(const CTransaction &tx, const CWallet *wallet, bool use_max_sig = false) EXCLUSIVE_LOCKS_REQUIRED(wallet->cs_wallet);
int64_t CalculateMaximumSignedTxSize(const CTransaction &tx, const CWallet *wallet, const std::vector<CTxOut>& txouts, bool use_max_sig = false);
#endif // BITCOIN_WALLET_WALLET_H