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Merge pull request #9013

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bb33daa add a test for the long term weight cache (Boog900)
65839b5 Fix: long term block weight cache The long term block weight cache was doing a wrong calculation when adding a new block to the cache. (Boog900)
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luigi1111 2023-10-02 15:27:39 -04:00
commit 67d190ce7c
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2 changed files with 37 additions and 33 deletions
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35
src/cryptonote_core/blockchain.cpp
View File

@ -4615,40 +4615,9 @@ bool Blockchain::update_next_cumulative_weight_limit(uint64_t *long_term_effecti
}
else
{
const uint64_t block_weight = m_db->get_block_weight(db_height - 1);
const uint64_t nblocks = std::min<uint64_t>(m_long_term_block_weights_window, db_height);
const uint64_t long_term_median = get_long_term_block_weight_median(db_height - nblocks, nblocks);
uint64_t long_term_median;
if (db_height == 1)
{
long_term_median = CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V5;
}
else
{
uint64_t nblocks = std::min<uint64_t>(m_long_term_block_weights_window, db_height);
if (nblocks == db_height)
--nblocks;
long_term_median = get_long_term_block_weight_median(db_height - nblocks - 1, nblocks);
}
m_long_term_effective_median_block_weight = std::max<uint64_t>(CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V5, long_term_median);
uint64_t short_term_constraint = m_long_term_effective_median_block_weight;
if (hf_version >= HF_VERSION_2021_SCALING)
short_term_constraint += m_long_term_effective_median_block_weight * 7 / 10;
else
short_term_constraint += m_long_term_effective_median_block_weight * 2 / 5;
uint64_t long_term_block_weight = std::min<uint64_t>(block_weight, short_term_constraint);
if (db_height == 1)
{
long_term_median = long_term_block_weight;
}
else
{
m_long_term_block_weights_cache_tip_hash = m_db->get_block_hash_from_height(db_height - 1);
m_long_term_block_weights_cache_rolling_median.insert(long_term_block_weight);
long_term_median = m_long_term_block_weights_cache_rolling_median.median();
}
m_long_term_effective_median_block_weight = std::max<uint64_t>(CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V5, long_term_median);
std::vector<uint64_t> weights;

35
tests/unit_tests/long_term_block_weight.cpp
View File

@ -400,3 +400,38 @@ TEST(long_term_block_weight, long_growth_spike_and_drop)
ASSERT_GT(long_term_effective_median_block_weight, 300000 * 1.07);
ASSERT_LT(long_term_effective_median_block_weight, 300000 * 1.09);
}
TEST(long_term_block_weight, cache_matches_true_value)
{
PREFIX(16);
// Add big blocks to increase the block weight limit
for (uint64_t h = 0; h <= 2000; ++h)
{
size_t w = bc->get_current_cumulative_block_weight_limit();
uint64_t ltw = bc->get_next_long_term_block_weight(w);
bc->get_db().add_block(std::make_pair(cryptonote::block(), ""), w, ltw, h, h, {});
bc->update_next_cumulative_weight_limit();
}
ASSERT_GT(bc->get_current_cumulative_block_weight_limit() * 10/17 , 300000);
// Add small blocks to the top of the chain
for (uint64_t h = 2000; h <= 5001; ++h)
{
size_t w = (bc->get_current_cumulative_block_weight_median() * 10/17) - 1000;
uint64_t ltw = bc->get_next_long_term_block_weight(w);
bc->get_db().add_block(std::make_pair(cryptonote::block(), ""), w, ltw, h, h, {});
bc->update_next_cumulative_weight_limit();
}
// get the weight limit
uint64_t weight_limit = bc->get_current_cumulative_block_weight_limit();
// refresh the cache
bc->m_long_term_block_weights_cache_rolling_median.clear();
bc->get_long_term_block_weight_median(bc->get_db().height() - TEST_LONG_TERM_BLOCK_WEIGHT_WINDOW, TEST_LONG_TERM_BLOCK_WEIGHT_WINDOW);
bc->update_next_cumulative_weight_limit();
// make sure the weight limit is the same
ASSERT_EQ(weight_limit, bc->get_current_cumulative_block_weight_limit());
}