Bitcoin Core  24.99.0
P2P Digital Currency
feerate.cpp
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1 // Copyright (c) 2009-2010 Satoshi Nakamoto
2 // Copyright (c) 2009-2021 The Bitcoin Core developers
3 // Distributed under the MIT software license, see the accompanying
4 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
5 
6 #include <consensus/amount.h>
7 #include <policy/feerate.h>
8 #include <tinyformat.h>
9 
10 #include <cmath>
11 
12 CFeeRate::CFeeRate(const CAmount& nFeePaid, uint32_t num_bytes)
13 {
14  const int64_t nSize{num_bytes};
15 
16  if (nSize > 0) {
17  nSatoshisPerK = nFeePaid * 1000 / nSize;
18  } else {
19  nSatoshisPerK = 0;
20  }
21 }
22 
23 CAmount CFeeRate::GetFee(uint32_t num_bytes) const
24 {
25  const int64_t nSize{num_bytes};
26 
27  // Be explicit that we're converting from a double to int64_t (CAmount) here.
28  // We've previously had issues with the silent double->int64_t conversion.
29  CAmount nFee{static_cast<CAmount>(std::ceil(nSatoshisPerK * nSize / 1000.0))};
30 
31  if (nFee == 0 && nSize != 0) {
32  if (nSatoshisPerK > 0) nFee = CAmount(1);
33  if (nSatoshisPerK < 0) nFee = CAmount(-1);
34  }
35 
36  return nFee;
37 }
38 
39 std::string CFeeRate::ToString(const FeeEstimateMode& fee_estimate_mode) const
40 {
41  switch (fee_estimate_mode) {
42  case FeeEstimateMode::SAT_VB: return strprintf("%d.%03d %s/vB", nSatoshisPerK / 1000, nSatoshisPerK % 1000, CURRENCY_ATOM);
43  default: return strprintf("%d.%08d %s/kvB", nSatoshisPerK / COIN, nSatoshisPerK % COIN, CURRENCY_UNIT);
44  }
45 }
int64_t CAmount
Amount in satoshis (Can be negative)
Definition: amount.h:12
static constexpr CAmount COIN
The amount of satoshis in one BTC.
Definition: amount.h:15
std::string ToString(const FeeEstimateMode &fee_estimate_mode=FeeEstimateMode::BTC_KVB) const
Definition: feerate.cpp:39
CAmount GetFee(uint32_t num_bytes) const
Return the fee in satoshis for the given vsize in vbytes.
Definition: feerate.cpp:23
CAmount nSatoshisPerK
Fee rate in sat/kvB (satoshis per 1000 virtualbytes)
Definition: feerate.h:36
CFeeRate()
Fee rate of 0 satoshis per kvB.
Definition: feerate.h:40
const std::string CURRENCY_ATOM
Definition: feerate.h:18
const std::string CURRENCY_UNIT
Definition: feerate.h:17
FeeEstimateMode
Definition: feerate.h:21
@ SAT_VB
Use sat/vB fee rate unit.
#define strprintf
Format arguments and return the string or write to given std::ostream (see tinyformat::format doc for...
Definition: tinyformat.h:1164