Branch data Line data Source code
1 : : // Copyright (c) 2009-2010 Satoshi Nakamoto
2 : : // Copyright (c) 2009-2022 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 : : #ifndef BITCOIN_POLICY_FEERATE_H
7 : : #define BITCOIN_POLICY_FEERATE_H
8 : :
9 : : #include <consensus/amount.h>
10 : : #include <serialize.h>
11 : :
12 : :
13 : : #include <cstdint>
14 : : #include <string>
15 : : #include <type_traits>
16 : :
17 : : const std::string CURRENCY_UNIT = "BTC"; // One formatted unit
18 : : const std::string CURRENCY_ATOM = "sat"; // One indivisible minimum value unit
19 : :
20 : : /* Used to determine type of fee estimation requested */
21 : : enum class FeeEstimateMode {
22 : : UNSET, //!< Use default settings based on other criteria
23 : : ECONOMICAL, //!< Force estimateSmartFee to use non-conservative estimates
24 : : CONSERVATIVE, //!< Force estimateSmartFee to use conservative estimates
25 : : BTC_KVB, //!< Use BTC/kvB fee rate unit
26 : : SAT_VB, //!< Use sat/vB fee rate unit
27 : : };
28 : :
29 : : /**
30 : : * Fee rate in satoshis per kilovirtualbyte: CAmount / kvB
31 : : */
32 : : class CFeeRate
33 : : {
34 : : private:
35 : : /** Fee rate in sat/kvB (satoshis per 1000 virtualbytes) */
36 : : CAmount nSatoshisPerK;
37 : :
38 : : public:
39 : : /** Fee rate of 0 satoshis per kvB */
40 [ + + ]: 55 : CFeeRate() : nSatoshisPerK(0) { }
41 : : template<std::integral I> // Disallow silent float -> int conversion
42 [ + - + - : 403933 : explicit CFeeRate(const I _nSatoshisPerK): nSatoshisPerK(_nSatoshisPerK) {
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43 : 124 : }
44 : :
45 : : /**
46 : : * Construct a fee rate from a fee in satoshis and a vsize in vB.
47 : : *
48 : : * param@[in] nFeePaid The fee paid by a transaction, in satoshis
49 : : * param@[in] num_bytes The vsize of a transaction, in vbytes
50 : : */
51 : : CFeeRate(const CAmount& nFeePaid, uint32_t num_bytes);
52 : :
53 : : /**
54 : : * Return the fee in satoshis for the given vsize in vbytes.
55 : : * If the calculated fee would have fractional satoshis, then the
56 : : * returned fee will always be rounded up to the nearest satoshi.
57 : : */
58 : : CAmount GetFee(uint32_t num_bytes) const;
59 : :
60 : : /**
61 : : * Return the fee in satoshis for a vsize of 1000 vbytes
62 : : */
63 [ - + + - : 98786 : CAmount GetFeePerK() const { return nSatoshisPerK; }
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64 [ + - # # ]: 27 : friend bool operator<(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK < b.nSatoshisPerK; }
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65 [ + + ]: 903 : friend bool operator>(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK > b.nSatoshisPerK; }
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66 [ - + ][ + - : 76 : friend bool operator==(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK == b.nSatoshisPerK; }
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67 [ + + ][ + - : 121 : friend bool operator<=(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK <= b.nSatoshisPerK; }
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68 : : friend bool operator>=(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK >= b.nSatoshisPerK; }
69 [ # # # # ]: 7 : friend bool operator!=(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK != b.nSatoshisPerK; }
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70 : 8 : CFeeRate& operator+=(const CFeeRate& a) { nSatoshisPerK += a.nSatoshisPerK; return *this; }
71 [ + - ]: 13 : std::string ToString(const FeeEstimateMode& fee_estimate_mode = FeeEstimateMode::BTC_KVB) const;
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72 [ + - + - : 5 : friend CFeeRate operator*(const CFeeRate& f, int a) { return CFeeRate(a * f.nSatoshisPerK); }
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73 [ - + ][ + - : 133 : friend CFeeRate operator*(int a, const CFeeRate& f) { return CFeeRate(a * f.nSatoshisPerK); }
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74 : :
75 : : SERIALIZE_METHODS(CFeeRate, obj) { READWRITE(obj.nSatoshisPerK); }
76 : : };
77 : :
78 : : #endif // BITCOIN_POLICY_FEERATE_H
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