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// Copyright (c) 2021 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_SPEND_H
#define BITCOIN_WALLET_SPEND_H
#include <consensus/amount.h>
#include <policy/fees.h> // for FeeCalculation
#include <util/result.h>
#include <wallet/coinselection.h>
#include <wallet/transaction.h>
#include <wallet/wallet.h>
#include <optional>
namespace wallet {
/** Get the marginal bytes if spending the specified output from this transaction.
* Use CoinControl to determine whether to expect signature grinding when calculating the size of the input spend. */
int CalculateMaximumSignedInputSize(const CTxOut& txout, const CWallet* pwallet, const CCoinControl* coin_control = nullptr);
int CalculateMaximumSignedInputSize(const CTxOut& txout, const COutPoint outpoint, const SigningProvider* pwallet, const CCoinControl* coin_control = nullptr);
struct TxSize {
int64_t vsize{-1};
int64_t weight{-1};
};
/** Calculate the size of the transaction using CoinControl to determine
* whether to expect signature grinding when calculating the size of the input spend. */
TxSize CalculateMaximumSignedTxSize(const CTransaction& tx, const CWallet* wallet, const std::vector<CTxOut>& txouts, const CCoinControl* coin_control = nullptr);
TxSize CalculateMaximumSignedTxSize(const CTransaction& tx, const CWallet* wallet, const CCoinControl* coin_control = nullptr) EXCLUSIVE_LOCKS_REQUIRED(wallet->cs_wallet);
/**
* COutputs available for spending, stored by OutputType.
* This struct is really just a wrapper around OutputType vectors with a convenient
* method for concatenating and returning all COutputs as one vector.
*
* Size(), Clear(), Erase(), Shuffle(), and Add() methods are implemented to
* allow easy interaction with the struct.
*/
struct CoinsResult {
std::map<OutputType, std::vector<COutput>> coins;
/** Concatenate and return all COutputs as one vector */
std::vector<COutput> All() const;
/** The following methods are provided so that CoinsResult can mimic a vector,
* i.e., methods can work with individual OutputType vectors or on the entire object */
size_t Size() const;
void Clear();
void Erase(const std::set<COutPoint>& coins_to_remove);
void Shuffle(FastRandomContext& rng_fast);
void Add(OutputType type, const COutput& out);
/** Sum of all available coins */
CAmount total_amount{0};
};
/**
* Populate the CoinsResult struct with vectors of available COutputs, organized by OutputType.
*/
CoinsResult AvailableCoins(const CWallet& wallet,
const CCoinControl* coinControl = nullptr,
std::optional<CFeeRate> feerate = std::nullopt,
const CAmount& nMinimumAmount = 1,
const CAmount& nMaximumAmount = MAX_MONEY,
const CAmount& nMinimumSumAmount = MAX_MONEY,
const uint64_t nMaximumCount = 0,
bool only_spendable = true) EXCLUSIVE_LOCKS_REQUIRED(wallet.cs_wallet);
/**
* Wrapper function for AvailableCoins which skips the `feerate` parameter. Use this function
* to list all available coins (e.g. listunspent RPC) while not intending to fund a transaction.
*/
CoinsResult AvailableCoinsListUnspent(const CWallet& wallet, const CCoinControl* coinControl = nullptr, const CAmount& nMinimumAmount = 1, const CAmount& nMaximumAmount = MAX_MONEY, const CAmount& nMinimumSumAmount = MAX_MONEY, const uint64_t nMaximumCount = 0) EXCLUSIVE_LOCKS_REQUIRED(wallet.cs_wallet);
CAmount GetAvailableBalance(const CWallet& wallet, const CCoinControl* coinControl = nullptr);
/**
* Find non-change parent output.
*/
const CTxOut& FindNonChangeParentOutput(const CWallet& wallet, const CTransaction& tx, int output) EXCLUSIVE_LOCKS_REQUIRED(wallet.cs_wallet);
const CTxOut& FindNonChangeParentOutput(const CWallet& wallet, const COutPoint& outpoint) EXCLUSIVE_LOCKS_REQUIRED(wallet.cs_wallet);
/**
* Return list of available coins and locked coins grouped by non-change output address.
*/
std::map<CTxDestination, std::vector<COutput>> ListCoins(const CWallet& wallet) EXCLUSIVE_LOCKS_REQUIRED(wallet.cs_wallet);
std::vector<OutputGroup> GroupOutputs(const CWallet& wallet, const std::vector<COutput>& outputs, const CoinSelectionParams& coin_sel_params, const CoinEligibilityFilter& filter, bool positive_only);
/**
* Attempt to find a valid input set that preserves privacy by not mixing OutputTypes.
* `ChooseSelectionResult()` will be called on each OutputType individually and the best
* the solution (according to the waste metric) will be chosen. If a valid input cannot be found from any
* single OutputType, fallback to running `ChooseSelectionResult()` over all available coins.
*
* param@[in] wallet The wallet which provides solving data for the coins
* param@[in] nTargetValue The target value
* param@[in] eligilibity_filter A filter containing rules for which coins are allowed to be included in this selection
* param@[in] available_coins The struct of coins, organized by OutputType, available for selection prior to filtering
* param@[in] coin_selection_params Parameters for the coin selection
* param@[in] allow_mixed_output_types Relax restriction that SelectionResults must be of the same OutputType
* returns If successful, a SelectionResult containing the input set
* If failed, a nullopt
*/
std::optional<SelectionResult> AttemptSelection(const CWallet& wallet, const CAmount& nTargetValue, const CoinEligibilityFilter& eligibility_filter, const CoinsResult& available_coins,
const CoinSelectionParams& coin_selection_params, bool allow_mixed_output_types);
/**
* Attempt to find a valid input set that meets the provided eligibility filter and target.
* Multiple coin selection algorithms will be run and the input set that produces the least waste
* (according to the waste metric) will be chosen.
*
* param@[in] wallet The wallet which provides solving data for the coins
* param@[in] nTargetValue The target value
* param@[in] eligilibity_filter A filter containing rules for which coins are allowed to be included in this selection
* param@[in] available_coins The struct of coins, organized by OutputType, available for selection prior to filtering
* param@[in] coin_selection_params Parameters for the coin selection
* returns If successful, a SelectionResult containing the input set
* If failed, a nullopt
*/
std::optional<SelectionResult> ChooseSelectionResult(const CWallet& wallet, const CAmount& nTargetValue, const CoinEligibilityFilter& eligibility_filter, const std::vector<COutput>& available_coins,
const CoinSelectionParams& coin_selection_params);
/**
* Select a set of coins such that nTargetValue is met and at least
* all coins from coin_control are selected; never select unconfirmed coins if they are not ours
* param@[in] wallet The wallet which provides data necessary to spend the selected coins
* param@[in] available_coins The struct of coins, organized by OutputType, available for selection prior to filtering
* param@[in] nTargetValue The target value
* param@[in] coin_selection_params Parameters for this coin selection such as feerates, whether to avoid partial spends,
* and whether to subtract the fee from the outputs.
* returns If successful, a SelectionResult containing the selected coins
* If failed, a nullopt.
*/
std::optional<SelectionResult> SelectCoins(const CWallet& wallet, CoinsResult& available_coins, const CAmount& nTargetValue, const CCoinControl& coin_control,
const CoinSelectionParams& coin_selection_params) EXCLUSIVE_LOCKS_REQUIRED(wallet.cs_wallet);
struct CreatedTransactionResult
{
CTransactionRef tx;
CAmount fee;
FeeCalculation fee_calc;
int change_pos;
CreatedTransactionResult(CTransactionRef _tx, CAmount _fee, int _change_pos, const FeeCalculation& _fee_calc)
: tx(_tx), fee(_fee), fee_calc(_fee_calc), change_pos(_change_pos) {}
};
/**
* Create a new transaction paying the recipients with a set of coins
* selected by SelectCoins(); Also create the change output, when needed
* @note passing change_pos as -1 will result in setting a random position
*/
util::Result<CreatedTransactionResult> CreateTransaction(CWallet& wallet, const std::vector<CRecipient>& vecSend, int change_pos, const CCoinControl& coin_control, bool sign = true);
/**
* Insert additional inputs into the transaction by
* calling CreateTransaction();
*/
bool FundTransaction(CWallet& wallet, CMutableTransaction& tx, CAmount& nFeeRet, int& nChangePosInOut, bilingual_str& error, bool lockUnspents, const std::set<int>& setSubtractFeeFromOutputs, CCoinControl);
} // namespace wallet
#endif // BITCOIN_WALLET_SPEND_H
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