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difficulty is fun
This commit is contained in:
wowario
parent
aa7564806d
commit
2ddaa7835c
@ -33,6 +33,7 @@
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#include <cstddef>
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#include <cstdint>
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#include <vector>
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#include <boost/math/special_functions/round.hpp>
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#include "int-util.h"
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#include "crypto/hash.h"
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@ -121,10 +122,10 @@ namespace cryptonote {
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uint64_t next_difficulty_64(std::vector<std::uint64_t> timestamps, std::vector<uint64_t> cumulative_difficulties, size_t target_seconds) {
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if(timestamps.size() > DIFFICULTY_WINDOW)
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if(timestamps.size() > DIFFICULTY_WINDOW_V3)
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{
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timestamps.resize(DIFFICULTY_WINDOW);
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cumulative_difficulties.resize(DIFFICULTY_WINDOW);
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timestamps.resize(DIFFICULTY_WINDOW_V3);
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cumulative_difficulties.resize(DIFFICULTY_WINDOW_V3);
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}
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@ -133,17 +134,17 @@ namespace cryptonote {
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if (length <= 1) {
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return 1;
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}
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static_assert(DIFFICULTY_WINDOW >= 2, "Window is too small");
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assert(length <= DIFFICULTY_WINDOW);
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static_assert(DIFFICULTY_WINDOW_V3 >= 2, "Window is too small");
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assert(length <= DIFFICULTY_WINDOW_V3);
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sort(timestamps.begin(), timestamps.end());
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size_t cut_begin, cut_end;
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static_assert(2 * DIFFICULTY_CUT <= DIFFICULTY_WINDOW - 2, "Cut length is too large");
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if (length <= DIFFICULTY_WINDOW - 2 * DIFFICULTY_CUT) {
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static_assert(2 * DIFFICULTY_CUT_V2 <= DIFFICULTY_WINDOW_V3 - 2, "Cut length is too large");
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if (length <= DIFFICULTY_WINDOW_V3 - 2 * DIFFICULTY_CUT_V2) {
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cut_begin = 0;
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cut_end = length;
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} else {
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cut_begin = (length - (DIFFICULTY_WINDOW - 2 * DIFFICULTY_CUT) + 1) / 2;
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cut_end = cut_begin + (DIFFICULTY_WINDOW - 2 * DIFFICULTY_CUT);
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cut_begin = (length - (DIFFICULTY_WINDOW_V3 - 2 * DIFFICULTY_CUT_V2) + 1) / 2;
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cut_end = cut_begin + (DIFFICULTY_WINDOW_V3 - 2 * DIFFICULTY_CUT_V2);
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}
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assert(/*cut_begin >= 0 &&*/ cut_begin + 2 <= cut_end && cut_end <= length);
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uint64_t time_span = timestamps[cut_end - 1] - timestamps[cut_begin];
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@ -200,7 +201,7 @@ namespace cryptonote {
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return check_hash_128(hash, difficulty);
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}
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difficulty_type next_difficulty(std::vector<uint64_t> timestamps, std::vector<difficulty_type> cumulative_difficulties, size_t target_seconds) {
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difficulty_type next_difficulty(std::vector<uint64_t> timestamps, std::vector<difficulty_type> cumulative_difficulties, size_t target_seconds, uint64_t HEIGHT) {
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//cutoff DIFFICULTY_LAG
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if(timestamps.size() > DIFFICULTY_WINDOW)
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{
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@ -214,6 +215,8 @@ namespace cryptonote {
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if (length <= 1) {
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return 1;
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}
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// reset difficulty for solo mining to 100 million
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if (HEIGHT <= 331170 + DIFFICULTY_WINDOW && HEIGHT >= 331170) { return 100000000; }
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static_assert(DIFFICULTY_WINDOW >= 2, "Window is too small");
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assert(length <= DIFFICULTY_WINDOW);
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sort(timestamps.begin(), timestamps.end());
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@ -254,4 +257,193 @@ namespace cryptonote {
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return "0x" + s;
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}
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// LWMA difficulty algorithm
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// Background: https://github.com/zawy12/difficulty-algorithms/issues/3
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// Copyright (c) 2017-2018 Zawy
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difficulty_type next_difficulty_v2(std::vector<uint64_t> timestamps, std::vector<difficulty_type> cumulative_difficulties, size_t target_seconds, uint64_t HEIGHT) {
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const int64_t T = static_cast<int64_t>(target_seconds);
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size_t N = DIFFICULTY_WINDOW_V2;
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if (timestamps.size() < 4) {
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return 1;
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} else if ( timestamps.size() < N+1 ) {
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N = timestamps.size() - 1;
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} else {
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timestamps.resize(N+1);
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cumulative_difficulties.resize(N+1);
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}
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const double adjust = 0.998;
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const double k = N * (N + 1) / 2;
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double LWMA(0), sum_inverse_D(0), harmonic_mean_D(0), nextDifficulty(0);
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int64_t solveTime(0);
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uint64_t difficulty(0), next_difficulty(0);
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for (size_t i = 1; i <= N; i++) {
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solveTime = static_cast<int64_t>(timestamps[i]) - static_cast<int64_t>(timestamps[i - 1]);
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solveTime = std::min<int64_t>((T * 7), std::max<int64_t>(solveTime, (-7 * T)));
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difficulty = static_cast<uint64_t>(cumulative_difficulties[i] - cumulative_difficulties[i - 1]);
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LWMA += (int64_t)(solveTime * i) / k;
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sum_inverse_D += 1 / static_cast<double>(difficulty);
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}
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harmonic_mean_D = N / sum_inverse_D;
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if (static_cast<int64_t>(boost::math::round(LWMA)) < T / 20)
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LWMA = static_cast<double>(T / 20);
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nextDifficulty = harmonic_mean_D * T / LWMA * adjust;
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next_difficulty = static_cast<uint64_t>(nextDifficulty);
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return next_difficulty;
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}
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// LWMA-2
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difficulty_type next_difficulty_v3(std::vector<uint64_t> timestamps, std::vector<difficulty_type> cumulative_difficulties, uint64_t HEIGHT) {
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int64_t T = DIFFICULTY_TARGET_V2;
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int64_t N = DIFFICULTY_WINDOW_V2;
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int64_t L(0), ST, sum_3_ST(0), next_D, prev_D;
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assert(timestamps.size() == cumulative_difficulties.size() && timestamps.size() <= static_cast<uint64_t>(N+1) );
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for ( int64_t i = 1; i <= N; i++ ) {
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ST = static_cast<int64_t>(timestamps[i]) - static_cast<int64_t>(timestamps[i-1]);
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ST = std::max(-4*T, std::min(ST, 6*T));
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L += ST * i ;
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if ( i > N-3 ) {
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sum_3_ST += ST;
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}
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}
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next_D = (static_cast<int64_t>(cumulative_difficulties[N] - cumulative_difficulties[0])*T*(N+1)*99)/(100*2*L);
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prev_D = static_cast<int64_t>(cumulative_difficulties[N] - cumulative_difficulties[N-1]);
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next_D = std::max((prev_D*67)/100, std::min(next_D, (prev_D*150)/100));
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if ( sum_3_ST < (8*T)/10) {
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next_D = std::max(next_D,(prev_D*108)/100);
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}
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return static_cast<uint64_t>(next_D);
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}
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// LWMA-4
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difficulty_type next_difficulty_v4(std::vector<uint64_t> timestamps, std::vector<difficulty_type> cumulative_difficulties, uint64_t HEIGHT) {
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uint64_t T = DIFFICULTY_TARGET_V2;
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uint64_t N = DIFFICULTY_WINDOW_V2;
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uint64_t L(0), ST(0), next_D, prev_D, avg_D, i;
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assert(timestamps.size() == cumulative_difficulties.size() && timestamps.size() <= N+1 );
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if (HEIGHT <= 63469 + 1) { return 100000069; }
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std::vector<uint64_t>TS(N+1);
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TS[0] = timestamps[0];
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for ( i = 1; i <= N; i++) {
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if ( timestamps[i] > TS[i-1] ) { TS[i] = timestamps[i]; }
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else { TS[i] = TS[i-1]; }
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}
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for ( i = 1; i <= N; i++) {
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if ( i > 4 && TS[i]-TS[i-1] > 5*T && TS[i-1] - TS[i-4] < (14*T)/10 ) { ST = 2*T; }
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else if ( i > 7 && TS[i]-TS[i-1] > 5*T && TS[i-1] - TS[i-7] < 4*T ) { ST = 2*T; }
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else {
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ST = std::min(5*T ,TS[i] - TS[i-1]);
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}
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L += ST * i ;
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}
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if (L < N*N*T/20 ) { L = N*N*T/20; }
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avg_D = static_cast<uint64_t>(( cumulative_difficulties[N] - cumulative_difficulties[0] )/ N);
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if (avg_D > 2000000*N*N*T) {
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next_D = (avg_D/(200*L))*(N*(N+1)*T*97);
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}
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else { next_D = (avg_D*N*(N+1)*T*97)/(200*L); }
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prev_D = static_cast<uint64_t>(cumulative_difficulties[N] - cumulative_difficulties[N-1]);
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if ( ( TS[N] - TS[N-1] < (2*T)/10 ) ||
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( TS[N] - TS[N-2] < (5*T)/10 ) ||
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( TS[N] - TS[N-3] < (8*T)/10 ) )
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{
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next_D = std::max( next_D, std::min( (prev_D*110)/100, (105*avg_D)/100 ) );
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}
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i = 1000000000;
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while (i > 1) {
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if ( next_D > i*100 ) { next_D = ((next_D+i/2)/i)*i; break; }
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else { i /= 10; }
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}
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if ( next_D > 100000 ) {
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next_D = ((next_D+500)/1000)*1000 + std::min(static_cast<uint64_t>(999), (TS[N]-TS[N-10])/10);
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}
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return static_cast<uint64_t>(next_D);
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}
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// LWMA-1 difficulty algorithm
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// Copyright (c) 2017-2019 Zawy, MIT License
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// https://github.com/zawy12/difficulty-algorithms/issues/3
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difficulty_type next_difficulty_v5(std::vector<uint64_t> timestamps, std::vector<difficulty_type> cumulative_difficulties, uint64_t HEIGHT) {
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uint64_t T = DIFFICULTY_TARGET_V2;
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uint64_t N = DIFFICULTY_WINDOW_V3;
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assert(timestamps.size() == cumulative_difficulties.size() && timestamps.size() <= N+1 );
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if (HEIGHT >= 81769 && HEIGHT < 81769 + N) { return 10000000; }
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assert(timestamps.size() == N+1);
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// hardcoding previously erroneously calculated difficulty entries
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if(HEIGHT == 307686) return 25800000;
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if(HEIGHT == 307692) return 1890000;
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if(HEIGHT == 307735) return 17900000;
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if(HEIGHT == 307742) return 21300000;
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if(HEIGHT == 307750) return 10900000;
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if(HEIGHT == 307766) return 2960000;
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uint64_t i, this_timestamp(0), previous_timestamp(0);
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difficulty_type L(0), next_D, avg_D;
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previous_timestamp = timestamps[0]-T;
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for ( i = 1; i <= N; i++) {
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// Safely prevent out-of-sequence timestamps
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if ( timestamps[i] > previous_timestamp ) { this_timestamp = timestamps[i]; }
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else { this_timestamp = previous_timestamp+1; }
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L += i*std::min(6*T ,this_timestamp - previous_timestamp);
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previous_timestamp = this_timestamp;
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}
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if (L < N*N*T/20 ) { L = N*N*T/20; }
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avg_D = ( cumulative_difficulties[N] - cumulative_difficulties[0] )/ N;
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// Prevent round off error for small D and overflow for large D.
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if (avg_D > 2000000*N*N*T && HEIGHT < 307800) {
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next_D = (avg_D/(200*L))*(N*(N+1)*T*99);
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}
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else if (avg_D > uint64_t(-1)/(N*(N+1)*T*99) && HEIGHT > 307800) {
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next_D = (avg_D/(200*L))*(N*(N+1)*T*99);
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}
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else { next_D = (avg_D*N*(N+1)*T*99)/(200*L); }
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// Make all insignificant digits zero for easy reading.
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i = 1000000000;
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while (i > 1) {
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if ( next_D > i*100 ) { next_D = ((next_D+i/2)/i)*i; break; }
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else { i /= 10; }
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}
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return next_D;
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}
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difficulty_type next_difficulty_v6(std::vector<uint64_t> timestamps, std::vector<difficulty_type> cumulative_difficulties, size_t target_seconds) {
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if(timestamps.size() > DIFFICULTY_WINDOW_V3)
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{
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timestamps.resize(DIFFICULTY_WINDOW_V3);
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cumulative_difficulties.resize(DIFFICULTY_WINDOW_V3);
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}
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size_t length = timestamps.size();
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assert(length == cumulative_difficulties.size());
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if (length <= 1) {
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return 1;
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}
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static_assert(DIFFICULTY_WINDOW_V3 >= 2, "Window is too small");
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assert(length <= DIFFICULTY_WINDOW_V3);
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sort(timestamps.begin(), timestamps.end());
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size_t cut_begin, cut_end;
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static_assert(2 * DIFFICULTY_CUT_V2 <= DIFFICULTY_WINDOW_V3 - 2, "Cut length is too large");
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if (length <= DIFFICULTY_WINDOW_V3 - 2 * DIFFICULTY_CUT_V2) {
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cut_begin = 0;
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cut_end = length;
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} else {
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cut_begin = (length - (DIFFICULTY_WINDOW_V3 - 2 * DIFFICULTY_CUT_V2) + 1) / 2;
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cut_end = cut_begin + (DIFFICULTY_WINDOW_V3 - 2 * DIFFICULTY_CUT_V2);
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}
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assert(/*cut_begin >= 0 &&*/ cut_begin + 2 <= cut_end && cut_end <= length);
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uint64_t time_span = timestamps[cut_end - 1] - timestamps[cut_begin];
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if (time_span == 0) {
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time_span = 1;
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}
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difficulty_type total_work = cumulative_difficulties[cut_end - 1] - cumulative_difficulties[cut_begin];
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assert(total_work > 0);
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boost::multiprecision::uint256_t res = (boost::multiprecision::uint256_t(total_work) * target_seconds + time_span - 1) / time_span;
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if(res > max128bit)
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return 0; // to behave like previous implementation, may be better return max128bit?
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return res.convert_to<difficulty_type>();
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}
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}
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@ -57,7 +57,12 @@ namespace cryptonote
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bool check_hash_128(const crypto::hash &hash, difficulty_type difficulty);
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bool check_hash(const crypto::hash &hash, difficulty_type difficulty);
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difficulty_type next_difficulty(std::vector<std::uint64_t> timestamps, std::vector<difficulty_type> cumulative_difficulties, size_t target_seconds);
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difficulty_type next_difficulty(std::vector<std::uint64_t> timestamps, std::vector<difficulty_type> cumulative_difficulties, size_t target_seconds, uint64_t HEIGHT);
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difficulty_type next_difficulty_v2(std::vector<std::uint64_t> timestamps, std::vector<difficulty_type> cumulative_difficulties, size_t target_seconds, uint64_t HEIGHT);
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difficulty_type next_difficulty_v3(std::vector<std::uint64_t> timestamps, std::vector<difficulty_type> cumulative_difficulties, uint64_t HEIGHT);
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difficulty_type next_difficulty_v4(std::vector<std::uint64_t> timestamps, std::vector<difficulty_type> cumulative_difficulties, uint64_t HEIGHT);
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difficulty_type next_difficulty_v5(std::vector<std::uint64_t> timestamps, std::vector<difficulty_type> cumulative_difficulties, uint64_t HEIGHT);
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difficulty_type next_difficulty_v6(std::vector<std::uint64_t> timestamps, std::vector<difficulty_type> cumulative_difficulties, size_t target_seconds);
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std::string hex(difficulty_type v);
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}
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@ -85,8 +85,13 @@
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#define DIFFICULTY_WINDOW_V3 144
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#define DIFFICULTY_WINDOW_V2 60
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#define DIFFICULTY_WINDOW 720 // blocks
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#define DIFFICULTY_LAG_V2 3
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#define DIFFICULTY_LAG 15 // !!!
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#define DIFFICULTY_CUT_V2 12
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#define DIFFICULTY_CUT 60 // timestamps to cut after sorting
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#define DIFFICULTY_BLOCKS_COUNT_V4 DIFFICULTY_WINDOW_V3 + DIFFICULTY_LAG_V2
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#define DIFFICULTY_BLOCKS_COUNT_V3 DIFFICULTY_WINDOW_V3 + 1
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#define DIFFICULTY_BLOCKS_COUNT_V2 DIFFICULTY_WINDOW_V2 + 1
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#define DIFFICULTY_BLOCKS_COUNT DIFFICULTY_WINDOW + DIFFICULTY_LAG
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@ -897,17 +897,19 @@ start:
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// pop the oldest one from the list. This only requires 1x read per height instead
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// of doing 735 (DIFFICULTY_BLOCKS_COUNT).
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bool check = false;
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uint8_t version = get_current_hard_fork_version();
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uint64_t difficulty_blocks_count = version >= 20 ? DIFFICULTY_BLOCKS_COUNT_V4 : version <= 17 && version >= 11 ? DIFFICULTY_BLOCKS_COUNT_V3 : version <= 10 && version >= 8 ? DIFFICULTY_BLOCKS_COUNT_V2 : DIFFICULTY_BLOCKS_COUNT;
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if (m_reset_timestamps_and_difficulties_height)
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m_timestamps_and_difficulties_height = 0;
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if (m_timestamps_and_difficulties_height != 0 && ((height - m_timestamps_and_difficulties_height) == 1) && m_timestamps.size() >= DIFFICULTY_BLOCKS_COUNT)
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if (m_timestamps_and_difficulties_height != 0 && ((height - m_timestamps_and_difficulties_height) == 1) && m_timestamps.size() >= difficulty_blocks_count)
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{
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uint64_t index = height - 1;
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m_timestamps.push_back(m_db->get_block_timestamp(index));
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m_difficulties.push_back(m_db->get_block_cumulative_difficulty(index));
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while (m_timestamps.size() > DIFFICULTY_BLOCKS_COUNT)
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while (m_timestamps.size() > difficulty_blocks_count)
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m_timestamps.erase(m_timestamps.begin());
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while (m_difficulties.size() > DIFFICULTY_BLOCKS_COUNT)
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while (m_difficulties.size() > difficulty_blocks_count)
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m_difficulties.erase(m_difficulties.begin());
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m_timestamps_and_difficulties_height = height;
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@ -920,7 +922,7 @@ start:
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std::vector<difficulty_type> difficulties_from_cache = difficulties;
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{
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uint64_t offset = height - std::min <uint64_t> (height, static_cast<uint64_t>(DIFFICULTY_BLOCKS_COUNT));
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uint64_t offset = height - std::min <uint64_t> (height, static_cast<uint64_t>(difficulty_blocks_count));
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if (offset == 0)
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++offset;
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@ -966,7 +968,21 @@ start:
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}
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size_t target = get_difficulty_target();
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difficulty_type diff = next_difficulty(timestamps, difficulties, target);
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uint64_t HEIGHT = m_db->height();
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difficulty_type diff;
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if (version >= 20) {
|
||||
diff = next_difficulty_v6(timestamps, difficulties, target);
|
||||
} else if (version <= 17 && version >= 11) {
|
||||
diff = next_difficulty_v5(timestamps, difficulties, HEIGHT);
|
||||
} else if (version == 10) {
|
||||
diff = next_difficulty_v4(timestamps, difficulties, HEIGHT);
|
||||
} else if (version == 9) {
|
||||
diff = next_difficulty_v3(timestamps, difficulties, HEIGHT);
|
||||
} else if (version == 8) {
|
||||
diff = next_difficulty_v2(timestamps, difficulties, target, HEIGHT);
|
||||
} else {
|
||||
diff = next_difficulty(timestamps, difficulties, target, HEIGHT);
|
||||
}
|
||||
|
||||
CRITICAL_REGION_LOCAL1(m_difficulty_lock);
|
||||
m_difficulty_for_next_block_top_hash = top_hash;
|
||||
@ -1025,11 +1041,13 @@ size_t Blockchain::recalculate_difficulties(boost::optional<uint64_t> start_heig
|
||||
|
||||
std::vector<uint64_t> timestamps;
|
||||
std::vector<difficulty_type> difficulties;
|
||||
timestamps.reserve(DIFFICULTY_BLOCKS_COUNT + 1);
|
||||
difficulties.reserve(DIFFICULTY_BLOCKS_COUNT + 1);
|
||||
uint8_t version = get_current_hard_fork_version();
|
||||
uint64_t difficulty_blocks_count = version >= 20 ? DIFFICULTY_BLOCKS_COUNT_V4 : version <= 17 && version >= 11 ? DIFFICULTY_BLOCKS_COUNT_V3 : version <= 10 && version >= 8 ? DIFFICULTY_BLOCKS_COUNT_V2 : DIFFICULTY_BLOCKS_COUNT;
|
||||
timestamps.reserve(difficulty_blocks_count + 1);
|
||||
difficulties.reserve(difficulty_blocks_count + 1);
|
||||
if (start_height > 1)
|
||||
{
|
||||
for (uint64_t i = 0; i < DIFFICULTY_BLOCKS_COUNT; ++i)
|
||||
for (uint64_t i = 0; i < difficulty_blocks_count; ++i)
|
||||
{
|
||||
uint64_t height = start_height - 1 - i;
|
||||
if (height == 0)
|
||||
@ -1044,7 +1062,21 @@ size_t Blockchain::recalculate_difficulties(boost::optional<uint64_t> start_heig
|
||||
for (uint64_t height = start_height; height <= top_height; ++height)
|
||||
{
|
||||
size_t target = get_ideal_hard_fork_version(height) < 2 ? DIFFICULTY_TARGET_V1 : DIFFICULTY_TARGET_V2;
|
||||
difficulty_type recalculated_diff = next_difficulty(timestamps, difficulties, target);
|
||||
uint64_t HEIGHT = m_db->height();
|
||||
difficulty_type recalculated_diff;
|
||||
if (version >= 20) {
|
||||
recalculated_diff = next_difficulty_v6(timestamps, difficulties, target);
|
||||
} else if (version <= 17 && version >= 11) {
|
||||
recalculated_diff = next_difficulty_v5(timestamps, difficulties, HEIGHT);
|
||||
} else if (version == 10) {
|
||||
recalculated_diff = next_difficulty_v4(timestamps, difficulties, HEIGHT);
|
||||
} else if (version == 9) {
|
||||
recalculated_diff = next_difficulty_v3(timestamps, difficulties, HEIGHT);
|
||||
} else if (version == 8) {
|
||||
recalculated_diff = next_difficulty_v2(timestamps, difficulties, target, HEIGHT);
|
||||
} else {
|
||||
recalculated_diff = next_difficulty(timestamps, difficulties, target, HEIGHT);
|
||||
}
|
||||
|
||||
boost::multiprecision::uint256_t recalculated_cum_diff_256 = boost::multiprecision::uint256_t(recalculated_diff) + last_cum_diff;
|
||||
CHECK_AND_ASSERT_THROW_MES(recalculated_cum_diff_256 <= std::numeric_limits<difficulty_type>::max(), "Difficulty overflow!");
|
||||
@ -1072,9 +1104,9 @@ size_t Blockchain::recalculate_difficulties(boost::optional<uint64_t> start_heig
|
||||
timestamps.push_back(m_db->get_block_timestamp(height));
|
||||
difficulties.push_back(recalculated_cum_diff);
|
||||
}
|
||||
if (timestamps.size() > DIFFICULTY_BLOCKS_COUNT)
|
||||
if (timestamps.size() > difficulty_blocks_count)
|
||||
{
|
||||
CHECK_AND_ASSERT_THROW_MES(timestamps.size() == DIFFICULTY_BLOCKS_COUNT + 1, "Wrong timestamps size: " << timestamps.size());
|
||||
CHECK_AND_ASSERT_THROW_MES(timestamps.size() == difficulty_blocks_count + 1, "Wrong timestamps size: " << timestamps.size());
|
||||
timestamps.erase(timestamps.begin());
|
||||
difficulties.erase(difficulties.begin());
|
||||
}
|
||||
@ -1299,16 +1331,18 @@ difficulty_type Blockchain::get_next_difficulty_for_alternative_chain(const std:
|
||||
LOG_PRINT_L3("Blockchain::" << __func__);
|
||||
std::vector<uint64_t> timestamps;
|
||||
std::vector<difficulty_type> cumulative_difficulties;
|
||||
uint8_t version = get_current_hard_fork_version();
|
||||
uint64_t difficulty_blocks_count = version >= 20 ? DIFFICULTY_BLOCKS_COUNT_V4 : version <= 17 && version >= 11 ? DIFFICULTY_BLOCKS_COUNT_V3 : version <= 10 && version >= 8 ? DIFFICULTY_BLOCKS_COUNT_V2 : DIFFICULTY_BLOCKS_COUNT;
|
||||
|
||||
// if the alt chain isn't long enough to calculate the difficulty target
|
||||
// based on its blocks alone, need to get more blocks from the main chain
|
||||
if(alt_chain.size()< DIFFICULTY_BLOCKS_COUNT)
|
||||
if(alt_chain.size()< difficulty_blocks_count)
|
||||
{
|
||||
CRITICAL_REGION_LOCAL(m_blockchain_lock);
|
||||
|
||||
// Figure out start and stop offsets for main chain blocks
|
||||
size_t main_chain_stop_offset = alt_chain.size() ? alt_chain.front().height : bei.height;
|
||||
size_t main_chain_count = DIFFICULTY_BLOCKS_COUNT - std::min(static_cast<size_t>(DIFFICULTY_BLOCKS_COUNT), alt_chain.size());
|
||||
size_t main_chain_count = difficulty_blocks_count - std::min(static_cast<size_t>(difficulty_blocks_count), alt_chain.size());
|
||||
main_chain_count = std::min(main_chain_count, main_chain_stop_offset);
|
||||
size_t main_chain_start_offset = main_chain_stop_offset - main_chain_count;
|
||||
|
||||
@ -1323,7 +1357,7 @@ difficulty_type Blockchain::get_next_difficulty_for_alternative_chain(const std:
|
||||
}
|
||||
|
||||
// make sure we haven't accidentally grabbed too many blocks...maybe don't need this check?
|
||||
CHECK_AND_ASSERT_MES((alt_chain.size() + timestamps.size()) <= DIFFICULTY_BLOCKS_COUNT, false, "Internal error, alt_chain.size()[" << alt_chain.size() << "] + vtimestampsec.size()[" << timestamps.size() << "] NOT <= DIFFICULTY_WINDOW[]" << DIFFICULTY_BLOCKS_COUNT);
|
||||
CHECK_AND_ASSERT_MES((alt_chain.size() + timestamps.size()) <= difficulty_blocks_count, false, "Internal error, alt_chain.size()[" << alt_chain.size() << "] + vtimestampsec.size()[" << timestamps.size() << "] NOT <= DIFFICULTY_WINDOW[]" << difficulty_blocks_count);
|
||||
|
||||
for (const auto &bei : alt_chain)
|
||||
{
|
||||
@ -1335,8 +1369,8 @@ difficulty_type Blockchain::get_next_difficulty_for_alternative_chain(const std:
|
||||
// and timestamps from it alone
|
||||
else
|
||||
{
|
||||
timestamps.resize(static_cast<size_t>(DIFFICULTY_BLOCKS_COUNT));
|
||||
cumulative_difficulties.resize(static_cast<size_t>(DIFFICULTY_BLOCKS_COUNT));
|
||||
timestamps.resize(static_cast<size_t>(difficulty_blocks_count));
|
||||
cumulative_difficulties.resize(static_cast<size_t>(difficulty_blocks_count));
|
||||
size_t count = 0;
|
||||
size_t max_i = timestamps.size()-1;
|
||||
// get difficulties and timestamps from most recent blocks in alt chain
|
||||
@ -1345,7 +1379,7 @@ difficulty_type Blockchain::get_next_difficulty_for_alternative_chain(const std:
|
||||
timestamps[max_i - count] = bei.bl.timestamp;
|
||||
cumulative_difficulties[max_i - count] = bei.cumulative_difficulty;
|
||||
count++;
|
||||
if(count >= DIFFICULTY_BLOCKS_COUNT)
|
||||
if(count >= difficulty_blocks_count)
|
||||
break;
|
||||
}
|
||||
}
|
||||
@ -1354,7 +1388,22 @@ difficulty_type Blockchain::get_next_difficulty_for_alternative_chain(const std:
|
||||
size_t target = get_ideal_hard_fork_version(bei.height) < 2 ? DIFFICULTY_TARGET_V1 : DIFFICULTY_TARGET_V2;
|
||||
|
||||
// calculate the difficulty target for the block and return it
|
||||
return next_difficulty(timestamps, cumulative_difficulties, target);
|
||||
uint64_t HEIGHT = m_db->height();
|
||||
difficulty_type next_diff;
|
||||
if (version >= 20) {
|
||||
next_diff = next_difficulty_v6(timestamps, cumulative_difficulties, target);
|
||||
} else if (version <= 17 && version >= 11) {
|
||||
next_diff = next_difficulty_v5(timestamps, cumulative_difficulties, HEIGHT);
|
||||
} else if (version == 10) {
|
||||
next_diff = next_difficulty_v4(timestamps, cumulative_difficulties, HEIGHT);
|
||||
} else if (version == 9) {
|
||||
next_diff = next_difficulty_v3(timestamps, cumulative_difficulties, HEIGHT);
|
||||
} else if (version == 8) {
|
||||
next_diff = next_difficulty_v2(timestamps, cumulative_difficulties, target, HEIGHT);
|
||||
} else {
|
||||
next_diff = next_difficulty(timestamps, cumulative_difficulties, target, HEIGHT);
|
||||
}
|
||||
return next_diff;
|
||||
}
|
||||
//------------------------------------------------------------------
|
||||
// This function does a sanity check on basic things that all miner
|
||||
|
||||
Loading…
Reference in New Issue
Block a user