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core: quantize per kB fee to 8 decimals

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moneromooo-monero 2017-03-03 23:31:38 +00:00
parent 3e761c137d
commit 3153349325
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GPG key ID: 686F07454D6CEFC3
2 changed files with 20 additions and 1 deletions
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1
src/cryptonote_config.h
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@ -128,6 +128,7 @@
#define THREAD_STACK_SIZE 5 * 1024 * 1024 #define THREAD_STACK_SIZE 5 * 1024 * 1024
#define HF_VERSION_DYNAMIC_FEE 4 #define HF_VERSION_DYNAMIC_FEE 4
#define PER_KB_FEE_QUANTIZATION_DECIMALS 8
// New constants are intended to go here // New constants are intended to go here
namespace config namespace config

20
src/cryptonote_core/blockchain.cpp
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@ -2795,6 +2795,19 @@ void Blockchain::check_ring_signature(const crypto::hash &tx_prefix_hash, const
result = crypto::check_ring_signature(tx_prefix_hash, key_image, p_output_keys, sig.data()) ? 1 : 0; result = crypto::check_ring_signature(tx_prefix_hash, key_image, p_output_keys, sig.data()) ? 1 : 0;
} }
//------------------------------------------------------------------
static uint64_t get_fee_quantization_mask()
{
static uint64_t mask = 0;
if (mask == 0)
{
mask = 1;
for (size_t n = PER_KB_FEE_QUANTIZATION_DECIMALS; n < CRYPTONOTE_DISPLAY_DECIMAL_POINT; ++n)
mask *= 10;
}
return mask;
}
//------------------------------------------------------------------ //------------------------------------------------------------------
uint64_t Blockchain::get_dynamic_per_kb_fee(uint64_t block_reward, size_t median_block_size) uint64_t Blockchain::get_dynamic_per_kb_fee(uint64_t block_reward, size_t median_block_size)
{ {
@ -2810,7 +2823,12 @@ uint64_t Blockchain::get_dynamic_per_kb_fee(uint64_t block_reward, size_t median
div128_32(hi, lo, 1000000, &hi, &lo); div128_32(hi, lo, 1000000, &hi, &lo);
assert(hi == 0); assert(hi == 0);
return lo; // quantize fee up to 8 decimals
uint64_t mask = get_fee_quantization_mask();
uint64_t qlo = (lo + mask - 1) / mask * mask;
MDEBUG("lo " << print_money(lo) << ", qlo " << print_money(qlo) << ", mask " << mask);
return qlo;
} }
//------------------------------------------------------------------ //------------------------------------------------------------------