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Fix optimistic request

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This commit is contained in:
Piotr Wójcik 2025-01-09 19:03:42 +01:00
commit 38edde0ffb
1 changed files with 37 additions and 12 deletions
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49
nano/node/bootstrap/bootstrap_service.cpp
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@ -515,33 +515,58 @@ bool nano::bootstrap_service::request (nano::account account, size_t count, std:
// Check if the account picked has blocks, if it does, start the pull from the highest block
if (auto info = ledger.store.account.get (transaction, account))
{
tag.type = query_type::blocks_by_hash;
// Probabilistically choose between requesting blocks from account frontier or confirmed frontier
// Optimistic requests start from the (possibly unconfirmed) account frontier and are vulnerable to bootstrap poisoning
// Safe requests start from the confirmed frontier and given enough time will eventually resolve forks
bool optimistic_reuest = rng.random (100) < config.optimistic_request_percentage;
if (!optimistic_reuest)
{
if (auto conf_info = ledger.store.confirmation_height.get (transaction, account))
{
stats.inc (nano::stat::type::bootstrap_request_blocks, nano::stat::detail::safe);
tag.start = conf_info->frontier;
tag.hash = conf_info->height;
}
}
if (tag.start.is_zero ())
if (optimistic_reuest) // Optimistic request case
{
stats.inc (nano::stat::type::bootstrap_request_blocks, nano::stat::detail::optimistic);
tag.type = query_type::blocks_by_hash;
tag.start = info->head;
tag.hash = info->head;
logger.debug (nano::log::type::bootstrap, "Requesting blocks for {} starting from account frontier: {} (optimistic: {})",
account.to_account (), // TODO: Lazy eval
tag.start.to_string (), // TODO: Lazy eval
optimistic_reuest);
}
else // Pessimistic (safe) request case
{
stats.inc (nano::stat::type::bootstrap_request_blocks, nano::stat::detail::safe);
if (auto conf_info = ledger.store.confirmation_height.get (transaction, account))
{
tag.type = query_type::blocks_by_hash;
tag.start = conf_info->frontier;
tag.hash = conf_info->height;
logger.debug (nano::log::type::bootstrap, "Requesting blocks for {} starting from confirmation frontier: {} (optimistic: {})",
account.to_account (), // TODO: Lazy eval
tag.start.to_string (), // TODO: Lazy eval
optimistic_reuest);
}
else
{
tag.type = query_type::blocks_by_account;
tag.start = account;
logger.debug (nano::log::type::bootstrap, "Requesting blocks for {} starting from account root (optimistic: {})",
account.to_account (), // TODO: Lazy eval
optimistic_reuest);
}
}
}
else
{
stats.inc (nano::stat::type::bootstrap_request_blocks, nano::stat::detail::base);
tag.type = query_type::blocks_by_account;
tag.start = account;
logger.debug (nano::log::type::bootstrap, "Requesting blocks for {}", account.to_account ()); // TODO: Lazy eval
}
}