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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_POLICY_FEERATE_H
#define BITCOIN_POLICY_FEERATE_H
#include <consensus/amount.h>
#include <serialize.h>
#include <cstdint>
#include <string>
#include <type_traits>
const std::string CURRENCY_UNIT = "BTC"; // One formatted unit
const std::string CURRENCY_ATOM = "sat"; // One indivisible minimum value unit
/* Used to determine type of fee estimation requested */
enum class FeeEstimateMode {
UNSET, //!< Use default settings based on other criteria
ECONOMICAL, //!< Force estimateSmartFee to use non-conservative estimates
CONSERVATIVE, //!< Force estimateSmartFee to use conservative estimates
BTC_KVB, //!< Use BTC/kvB fee rate unit
SAT_VB, //!< Use sat/vB fee rate unit
};
/**
* Fee rate in satoshis per kilovirtualbyte: CAmount / kvB
*/
class CFeeRate
{
private:
/** Fee rate in sat/kvB (satoshis per 1000 virtualbytes) */
CAmount nSatoshisPerK;
public:
/** Fee rate of 0 satoshis per kvB */
CFeeRate() : nSatoshisPerK(0) { }
template<typename I>
explicit CFeeRate(const I _nSatoshisPerK): nSatoshisPerK(_nSatoshisPerK) {
// We've previously had bugs creep in from silent double->int conversion...
static_assert(std::is_integral<I>::value, "CFeeRate should be used without floats");
}
/**
* Construct a fee rate from a fee in satoshis and a vsize in vB.
*
* param@[in] nFeePaid The fee paid by a transaction, in satoshis
* param@[in] num_bytes The vsize of a transaction, in vbytes
*/
CFeeRate(const CAmount& nFeePaid, uint32_t num_bytes);
/**
* Return the fee in satoshis for the given vsize in vbytes.
* If the calculated fee would have fractional satoshis, then the
* returned fee will always be rounded up to the nearest satoshi.
*/
CAmount GetFee(uint32_t num_bytes) const;
/**
* Return the fee in satoshis for a vsize of 1000 vbytes
*/
CAmount GetFeePerK() const { return nSatoshisPerK; }
friend bool operator<(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK < b.nSatoshisPerK; }
friend bool operator>(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK > b.nSatoshisPerK; }
friend bool operator==(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK == b.nSatoshisPerK; }
friend bool operator<=(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK <= b.nSatoshisPerK; }
friend bool operator>=(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK >= b.nSatoshisPerK; }
friend bool operator!=(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK != b.nSatoshisPerK; }
CFeeRate& operator+=(const CFeeRate& a) { nSatoshisPerK += a.nSatoshisPerK; return *this; }
std::string ToString(const FeeEstimateMode& fee_estimate_mode = FeeEstimateMode::BTC_KVB) const;
SERIALIZE_METHODS(CFeeRate, obj) { READWRITE(obj.nSatoshisPerK); }
};
#endif // BITCOIN_POLICY_FEERATE_H
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