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rpc: scanblocks, do not traverse the whole chain block by block

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The current flow walks-through every block in the active chain until
hits the chain tip or processes 10k blocks, then calls
`lookupFilterRange()` to obtain all the filters from that
particular range.

This is only done to obtain the heights range to look up the block
filters. Which is unneeded.

As `scanblocks` only lookup block filters in the active chain, we can
directly calculate the lookup range heights, by using the chain tip,
without requiring to traverse the chain block by block.
This commit is contained in:
furszy 2022-09-15 17:38:26 -03:00
parent 3ce7b27124
commit ce50acc54f
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GPG Key ID: 5DD23CCC686AA623
1 changed files with 49 additions and 49 deletions
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98
src/rpc/blockchain.cpp
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@ -2383,27 +2383,28 @@ static RPCHelpMan scanblocks()
ChainstateManager& chainman = EnsureChainman(node);
// set the start-height
const CBlockIndex* block = nullptr;
const CBlockIndex* start_index = nullptr;
const CBlockIndex* stop_block = nullptr;
{
LOCK(cs_main);
CChain& active_chain = chainman.ActiveChain();
block = active_chain.Genesis();
stop_block = active_chain.Tip();
start_index = active_chain.Genesis();
stop_block = active_chain.Tip(); // If no stop block is provided, stop at the chain tip.
if (!request.params[2].isNull()) {
block = active_chain[request.params[2].getInt<int>()];
if (!block) {
start_index = active_chain[request.params[2].getInt<int>()];
if (!start_index) {
throw JSONRPCError(RPC_MISC_ERROR, "Invalid start_height");
}
}
if (!request.params[3].isNull()) {
stop_block = active_chain[request.params[3].getInt<int>()];
if (!stop_block || stop_block->nHeight < block->nHeight) {
if (!stop_block || stop_block->nHeight < start_index->nHeight) {
throw JSONRPCError(RPC_MISC_ERROR, "Invalid stop_height");
}
}
}
CHECK_NONFATAL(block);
CHECK_NONFATAL(start_index);
CHECK_NONFATAL(stop_block);
// loop through the scan objects, add scripts to the needle_set
GCSFilter::ElementSet needle_set;
@ -2416,63 +2417,62 @@ static RPCHelpMan scanblocks()
}
UniValue blocks(UniValue::VARR);
const int amount_per_chunk = 10000;
const CBlockIndex* start_index = block; // for remembering the start of a blockfilter range
std::vector<BlockFilter> filters;
const CBlockIndex* start_block = block; // for progress reporting
const int total_blocks_to_process = stop_block->nHeight - start_block->nHeight;
int start_block_height = start_index->nHeight; // for progress reporting
const int total_blocks_to_process = stop_block->nHeight - start_block_height;
g_scanfilter_should_abort_scan = false;
g_scanfilter_progress = 0;
g_scanfilter_progress_height = start_block->nHeight;
g_scanfilter_progress_height = start_block_height;
while (block) {
const CBlockIndex* end_range = nullptr;
do {
node.rpc_interruption_point(); // allow a clean shutdown
if (g_scanfilter_should_abort_scan) {
LogPrintf("scanblocks RPC aborted at height %d.\n", block->nHeight);
LogPrintf("scanblocks RPC aborted at height %d.\n", end_range->nHeight);
break;
}
const CBlockIndex* next = nullptr;
{
LOCK(cs_main);
CChain& active_chain = chainman.ActiveChain();
next = active_chain.Next(block);
if (block == stop_block) next = nullptr;
}
if (start_index->nHeight + amount_per_chunk == block->nHeight || next == nullptr) {
LogPrint(BCLog::RPC, "Fetching blockfilters from height %d to height %d.\n", start_index->nHeight, block->nHeight);
if (index->LookupFilterRange(start_index->nHeight, block, filters)) {
for (const BlockFilter& filter : filters) {
// compare the elements-set with each filter
if (filter.GetFilter().MatchAny(needle_set)) {
if (filter_false_positives) {
// Double check the filter matches by scanning the block
const CBlockIndex& blockindex = *CHECK_NONFATAL(WITH_LOCK(cs_main, return chainman.m_blockman.LookupBlockIndex(filter.GetBlockHash())));
if (!CheckBlockFilterMatches(chainman.m_blockman, blockindex, needle_set)) {
continue;
}
// split the lookup range in chunks if we are deeper than 'amount_per_chunk' blocks from the stopping block
int start_block = !end_range ? start_index->nHeight : start_index->nHeight + 1; // to not include the previous round 'end_range' block
end_range = (start_block + amount_per_chunk < stop_block->nHeight) ?
WITH_LOCK(::cs_main, return chainman.ActiveChain()[start_block + amount_per_chunk]) :
stop_block;
if (index->LookupFilterRange(start_block, end_range, filters)) {
for (const BlockFilter& filter : filters) {
// compare the elements-set with each filter
if (filter.GetFilter().MatchAny(needle_set)) {
if (filter_false_positives) {
// Double check the filter matches by scanning the block
const CBlockIndex& blockindex = *CHECK_NONFATAL(WITH_LOCK(cs_main, return chainman.m_blockman.LookupBlockIndex(filter.GetBlockHash())));
if (!CheckBlockFilterMatches(chainman.m_blockman, blockindex, needle_set)) {
continue;
}
blocks.push_back(filter.GetBlockHash().GetHex());
LogPrint(BCLog::RPC, "scanblocks: found match in %s\n", filter.GetBlockHash().GetHex());
}
blocks.push_back(filter.GetBlockHash().GetHex());
LogPrint(BCLog::RPC, "scanblocks: found match in %s\n", filter.GetBlockHash().GetHex());
}
}
start_index = block;
// update progress
int blocks_processed = block->nHeight - start_block->nHeight;
if (total_blocks_to_process > 0) { // avoid division by zero
g_scanfilter_progress = (int)(100.0 / total_blocks_to_process * blocks_processed);
} else {
g_scanfilter_progress = 100;
}
g_scanfilter_progress_height = block->nHeight;
}
block = next;
}
ret.pushKV("from_height", start_block->nHeight);
ret.pushKV("to_height", g_scanfilter_progress_height.load());
start_index = end_range;
// update progress
int blocks_processed = end_range->nHeight - start_block_height;
if (total_blocks_to_process > 0) { // avoid division by zero
g_scanfilter_progress = (int)(100.0 / total_blocks_to_process * blocks_processed);
} else {
g_scanfilter_progress = 100;
}
g_scanfilter_progress_height = end_range->nHeight;
// Finish if we reached the stop block
} while (start_index != stop_block);
ret.pushKV("from_height", start_block_height);
ret.pushKV("to_height", stop_block->nHeight);
ret.pushKV("relevant_blocks", blocks);
}
else {