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       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                 :          0 :     CFeeRate() : nSatoshisPerK(0) { }
      41                 :            :     template<typename I>
      42                 :      78388 :     explicit CFeeRate(const I _nSatoshisPerK): nSatoshisPerK(_nSatoshisPerK) {
      43                 :            :         // We've previously had bugs creep in from silent double->int conversion...
      44                 :            :         static_assert(std::is_integral<I>::value, "CFeeRate should be used without floats");
      45                 :      78388 :     }
      46                 :            : 
      47                 :            :     /**
      48                 :            :      * Construct a fee rate from a fee in satoshis and a vsize in vB.
      49                 :            :      *
      50                 :            :      * param@[in]   nFeePaid    The fee paid by a transaction, in satoshis
      51                 :            :      * param@[in]   num_bytes   The vsize of a transaction, in vbytes
      52                 :            :      */
      53                 :            :     CFeeRate(const CAmount& nFeePaid, uint32_t num_bytes);
      54                 :            : 
      55                 :            :     /**
      56                 :            :      * Return the fee in satoshis for the given vsize in vbytes.
      57                 :            :      * If the calculated fee would have fractional satoshis, then the
      58                 :            :      * returned fee will always be rounded up to the nearest satoshi.
      59                 :            :      */
      60                 :            :     CAmount GetFee(uint32_t num_bytes) const;
      61                 :            : 
      62                 :            :     /**
      63                 :            :      * Return the fee in satoshis for a vsize of 1000 vbytes
      64                 :            :      */
      65                 :       4374 :     CAmount GetFeePerK() const { return nSatoshisPerK; }
      66                 :       4289 :     friend bool operator<(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK < b.nSatoshisPerK; }
      67                 :       9143 :     friend bool operator>(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK > b.nSatoshisPerK; }
      68                 :          0 :     friend bool operator==(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK == b.nSatoshisPerK; }
      69                 :       2951 :     friend bool operator<=(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK <= b.nSatoshisPerK; }
      70                 :          0 :     friend bool operator>=(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK >= b.nSatoshisPerK; }
      71                 :          0 :     friend bool operator!=(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK != b.nSatoshisPerK; }
      72                 :       2651 :     CFeeRate& operator+=(const CFeeRate& a) { nSatoshisPerK += a.nSatoshisPerK; return *this; }
      73                 :            :     std::string ToString(const FeeEstimateMode& fee_estimate_mode = FeeEstimateMode::BTC_KVB) const;
      74                 :            : 
      75                 :          0 :     SERIALIZE_METHODS(CFeeRate, obj) { READWRITE(obj.nSatoshisPerK); }
      76                 :            : };
      77                 :            : 
      78                 :            : #endif // BITCOIN_POLICY_FEERATE_H