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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2021 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <consensus/amount.h>
#include <policy/feerate.h>
#include <tinyformat.h>
#include <cmath>
CFeeRate::CFeeRate(const CAmount& nFeePaid, uint32_t num_bytes)
{
const int64_t nSize{num_bytes};
if (nSize > 0) {
nSatoshisPerK = nFeePaid * 1000 / nSize;
} else {
nSatoshisPerK = 0;
}
}
CAmount CFeeRate::GetFee(uint32_t num_bytes) const
{
const int64_t nSize{num_bytes};
// Be explicit that we're converting from a double to int64_t (CAmount) here.
// We've previously had issues with the silent double->int64_t conversion.
CAmount nFee{static_cast<CAmount>(std::ceil(nSatoshisPerK * nSize / 1000.0))};
if (nFee == 0 && nSize != 0) {
if (nSatoshisPerK > 0) nFee = CAmount(1);
if (nSatoshisPerK < 0) nFee = CAmount(-1);
}
return nFee;
}
std::string CFeeRate::ToString(const FeeEstimateMode& fee_estimate_mode) const
{
switch (fee_estimate_mode) {
case FeeEstimateMode::SAT_VB: return strprintf("%d.%03d %s/vB", nSatoshisPerK / 1000, nSatoshisPerK % 1000, CURRENCY_ATOM);
default: return strprintf("%d.%08d %s/kvB", nSatoshisPerK / COIN, nSatoshisPerK % COIN, CURRENCY_UNIT);
}
}
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