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Prepare compact blob for block broadcasts

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Reference transactions by index in the parent block instead of storing full 32 bytes per transaction
This commit is contained in:
SChernykh 2022-11-09 11:17:35 +01:00
parent bbc3d44526
commit c135787620
3 changed files with 41 additions and 5 deletions
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39
src/p2p_server.cpp
View file

@ -726,7 +726,7 @@ void P2PServer::remove_peer_from_list(const raw_ip& ip)
}
}
void P2PServer::broadcast(const PoolBlock& block)
void P2PServer::broadcast(const PoolBlock& block, const PoolBlock* parent)
{
MinerData miner_data = m_pool->miner_data();
@ -766,13 +766,48 @@ void P2PServer::broadcast(const PoolBlock& block)
writeVarint(outputs_blob_size, data->pruned_blob);
data->pruned_blob.insert(data->pruned_blob.end(), mainchain_data.begin() + outputs_offset + outputs_blob_size, mainchain_data.end());
const size_t N = block.m_transactions.size();
if ((N > 1) && parent) {
unordered_map<hash, size_t> parent_transactions;
parent_transactions.reserve(parent->m_transactions.size());
for (size_t i = 1; i < parent->m_transactions.size(); ++i) {
parent_transactions.emplace(parent->m_transactions[i], i);
}
// Reserve 1 additional byte per transaction to be ready for the worst case (all transactions are different in the parent block)
data->compact_blob.reserve(data->pruned_blob.capacity() + (N - 1));
// Copy pruned_blob without the transaction list
data->compact_blob.assign(data->pruned_blob.begin(), data->pruned_blob.end() - (N - 1) * HASH_SIZE);
// Process transaction hashes one by one
size_t num_found = 0;
for (size_t i = 1; i < N; ++i) {
const hash& tx = block.m_transactions[i];
auto it = parent_transactions.find(tx);
if (it != parent_transactions.end()) {
writeVarint(it->second, data->compact_blob);
++num_found;
}
else {
data->compact_blob.push_back(0);
data->compact_blob.insert(data->compact_blob.end(), tx.h, tx.h + HASH_SIZE);
}
}
LOGINFO(6, "compact blob: " << num_found << '/' << (N - 1) << " transactions were found in the parent block");
data->compact_blob.insert(data->compact_blob.end(), sidechain_data.begin(), sidechain_data.end());
}
data->pruned_blob.insert(data->pruned_blob.end(), sidechain_data.begin(), sidechain_data.end());
data->ancestor_hashes.reserve(block.m_uncles.size() + 1);
data->ancestor_hashes = block.m_uncles;
data->ancestor_hashes.push_back(block.m_parent);
LOGINFO(5, "Broadcasting block " << block.m_sidechainId << " (height " << block.m_sidechainHeight << "): " << data->pruned_blob.size() << '/' << data->blob.size() << " bytes (pruned/full)");
LOGINFO(5, "Broadcasting block " << block.m_sidechainId << " (height " << block.m_sidechainHeight << "): " << data->compact_blob.size() << '/' << data->pruned_blob.size() << '/' << data->blob.size() << " bytes (compact/pruned/full)");
{
MutexLock lock(m_broadcastLock);

3
src/p2p_server.h
View file

@ -130,7 +130,7 @@ public:
std::atomic<uint32_t> m_broadcastedHashesIndex{ 0 };
};
void broadcast(const PoolBlock& block);
void broadcast(const PoolBlock& block, const PoolBlock* parent);
uint64_t get_random64();
uint64_t get_peerId() const { return m_peerId; }
@ -212,6 +212,7 @@ private:
{
std::vector<uint8_t> blob;
std::vector<uint8_t> pruned_blob;
std::vector<uint8_t> compact_blob;
std::vector<hash> ancestor_hashes;
};

4
src/side_chain.cpp
View file

@ -1275,7 +1275,7 @@ void SideChain::verify_loop(PoolBlock* block)
if (block->m_wantBroadcast && !block->m_broadcasted) {
block->m_broadcasted = true;
if (server && (block->m_depth < UNCLE_BLOCK_DEPTH)) {
server->broadcast(*block);
server->broadcast(*block, get_parent(block));
}
}
@ -1674,7 +1674,7 @@ void SideChain::update_chain_tip(const PoolBlock* block)
if (p2pServer() && block->m_wantBroadcast && !block->m_broadcasted) {
block->m_broadcasted = true;
p2pServer()->broadcast(*block);
p2pServer()->broadcast(*block, get_parent(block));
}
}