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SideChain: faster check for low-diff spam blocks

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SChernykh 2021-10-29 11:39:15 +02:00
parent 113e39817d
commit 806e1ca0a3
1 changed files with 14 additions and 12 deletions
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26
src/side_chain.cpp
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@ -370,7 +370,7 @@ bool SideChain::add_external_block(PoolBlock& block, std::vector<hash>& missing_
return false;
}
difficulty_type min_accepted_diff;
bool too_low_diff = (block.m_difficulty < m_curDifficulty);
{
MutexLock lock(m_sidechainLock);
if (m_blocksById.find(block.m_sidechainId) != m_blocksById.end()) {
@ -378,23 +378,25 @@ bool SideChain::add_external_block(PoolBlock& block, std::vector<hash>& missing_
return true;
}
// Find the minimum difficulty in the current PPLNS window
min_accepted_diff = m_curDifficulty;
for (PoolBlock* tmp = m_chainTip; tmp && (tmp->m_sidechainHeight + m_chainWindowSize > m_chainTip->m_sidechainHeight); tmp = get_parent(tmp)) {
if (tmp->m_difficulty < min_accepted_diff) {
min_accepted_diff = tmp->m_difficulty;
// This is mainly an anti-spam measure, not an actual verification step
if (too_low_diff) {
// Reduce required diff by 50% (by doubling this block's diff) to account for alternative chains
difficulty_type diff2 = block.m_difficulty;
diff2 += block.m_difficulty;
for (PoolBlock* tmp = m_chainTip; tmp && (tmp->m_sidechainHeight + m_chainWindowSize > m_chainTip->m_sidechainHeight); tmp = get_parent(tmp)) {
if (diff2 >= tmp->m_difficulty) {
too_low_diff = false;
break;
}
}
}
}
LOGINFO(4, "add_external_block: height = " << block.m_sidechainHeight << ", id = " << block.m_sidechainId << ", mainchain height = " << block.m_txinGenHeight);
// Reduce it by 50% to account for alternative chains. This is mainly an anti-spam measure, not an actual verification step
min_accepted_diff.lo = (min_accepted_diff.lo >> 1) | (min_accepted_diff.hi << 63);
min_accepted_diff.hi >>= 1;
if (block.m_difficulty < min_accepted_diff) {
LOGWARN(4, "add_external_block: block has too low difficulty " << block.m_difficulty << ", expected >= " << min_accepted_diff << ". Ignoring it.");
if (too_low_diff) {
LOGWARN(4, "add_external_block: block has too low difficulty " << block.m_difficulty << ", expected >= ~" << m_curDifficulty << ". Ignoring it.");
return true;
}