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Fix online reps weight sampling (#4927)

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Piotr Wójcik 2025-07-12 11:22:33 +02:00 • committed by Piotr Wójcik
commit c96c7ab8f5
4 changed files with 104 additions and 14 deletions
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12
nano/core_test/node.cpp
View file

@ -201,17 +201,23 @@ TEST (node, quick_confirm)
auto genesis_start_balance (node1.balance (nano::dev::genesis_key.pub));
system.wallet (0)->insert_adhoc (key.prv);
system.wallet (0)->insert_adhoc (nano::dev::genesis_key.prv);
// Wait for online weight to stabilize after wallet insertion
ASSERT_TIMELY (5s, node1.online_reps.online () >= genesis_start_balance);
auto delta = node1.online_reps.delta ();
auto send = nano::send_block_builder ()
.previous (previous)
.destination (key.pub)
.balance (node1.online_reps.delta () + 1)
.balance (delta + 1)
.sign (nano::dev::genesis_key.prv, nano::dev::genesis_key.pub)
.work (*system.work.generate (previous))
.build ();
node1.process_active (send);
ASSERT_TIMELY (10s, !node1.balance (key.pub).is_zero ());
ASSERT_EQ (node1.balance (nano::dev::genesis_key.pub), node1.online_reps.delta () + 1);
ASSERT_EQ (node1.balance (key.pub), genesis_start_balance - (node1.online_reps.delta () + 1));
ASSERT_EQ (node1.balance (nano::dev::genesis_key.pub), delta + 1);
ASSERT_EQ (node1.balance (key.pub), genesis_start_balance - (delta + 1));
}
TEST (node, node_receive_quorum)

69
nano/core_test/online_reps.cpp
View file

@ -238,7 +238,7 @@ TEST (online_reps, observe_slow)
ASSERT_TRUE (nano::test::process (node, { send1, send2, open1, open2 }));
nano::test::confirm (node, { send1, send2, open1, open2 });
ASSERT_EQ (node.active.size (), 0);
ASSERT_TIMELY_EQ (5s, node.active.size (), 0);
// Add a block that we can vote on
auto send_dummy = builder.state ()
@ -271,4 +271,71 @@ TEST (online_reps, observe_slow)
// The slow rep weight should still be counted as online, even though it arrived slightly after the election already reached quorum
ASSERT_TIMELY_EQ (5s, node.online_reps.online (), weight * 2);
}
// Test that online weight recalculates when existing representative weights change
TEST (online_reps, weight_change_recalculation)
{
nano::test::system system;
auto & node = *system.add_node ();
ASSERT_EQ (0, node.online_reps.online ());
nano::keypair key1, key2;
auto const initial_weight = nano::nano_ratio * 1000;
auto const additional_weight = nano::nano_ratio * 2000;
// Create initial distribution
nano::block_builder builder;
auto send1 = builder.state ()
.account (nano::dev::genesis_key.pub)
.previous (nano::dev::genesis->hash ())
.representative (nano::dev::genesis_key.pub)
.balance (nano::dev::constants.genesis_amount - initial_weight)
.link (key1.pub)
.sign (nano::dev::genesis_key.prv, nano::dev::genesis_key.pub)
.work (*system.work.generate (nano::dev::genesis->hash ()))
.build ();
auto open1 = builder.state ()
.account (key1.pub)
.previous (0)
.representative (key1.pub)
.balance (initial_weight)
.link (send1->hash ())
.sign (key1.prv, key1.pub)
.work (*system.work.generate (key1.pub))
.build ();
ASSERT_TRUE (nano::test::process (node, { send1, open1 }));
// Observe the representative - should register initial weight
node.online_reps.observe (key1.pub);
ASSERT_EQ (initial_weight, node.online_reps.online ());
// Create additional weight delegation to the same representative
auto send2 = builder.state ()
.account (nano::dev::genesis_key.pub)
.previous (send1->hash ())
.representative (nano::dev::genesis_key.pub)
.balance (nano::dev::constants.genesis_amount - initial_weight - additional_weight)
.link (key2.pub)
.sign (nano::dev::genesis_key.prv, nano::dev::genesis_key.pub)
.work (*system.work.generate (send1->hash ()))
.build ();
auto open2 = builder.state ()
.account (key2.pub)
.previous (0)
.representative (key1.pub) // Delegate to key1
.balance (additional_weight)
.link (send2->hash ())
.sign (key2.prv, key2.pub)
.work (*system.work.generate (key2.pub))
.build ();
ASSERT_TRUE (nano::test::process (node, { send2, open2 }));
// Observe the same representative again (simulating a vote from existing rep)
// This should trigger recalculation and pick up the new weight
node.online_reps.observe (key1.pub);
// The bug was that online weight would not recalculate for existing representatives
// With the fix, it should now reflect the updated weight
ASSERT_TIMELY_EQ (5s, node.online_reps.online (), initial_weight + additional_weight);
}

34
nano/node/online_reps.cpp
View file

@ -64,18 +64,15 @@ void nano::online_reps::observe (nano::account const & rep)
nano::lock_guard<nano::mutex> lock{ mutex };
auto now = std::chrono::steady_clock::now ();
auto new_insert = reps.get<tag_account> ().erase (rep) == 0;
bool new_insert = reps.get<tag_account> ().erase (rep) == 0;
reps.insert ({ now, rep });
stats.inc (nano::stat::type::online_reps, new_insert ? nano::stat::detail::rep_new : nano::stat::detail::rep_update);
// Update current online weight if anything changed
if (new_insert)
{
stats.inc (nano::stat::type::online_reps, nano::stat::detail::update_online);
logger.debug (nano::log::type::online_reps, "Observed new representative: {}", rep.to_account ());
cached_online = calculate_online ();
update_online ();
}
}
}
@ -106,22 +103,39 @@ void nano::online_reps::trim ()
}
}
void nano::online_reps::update_online ()
{
stats.inc (nano::stat::type::online_reps, nano::stat::detail::update_online);
cached_online = calculate_online ();
}
void nano::online_reps::run ()
{
nano::unique_lock<nano::mutex> lock{ mutex };
last_sample = std::chrono::steady_clock::now ();
while (!stopped)
{
// Set next time point explicitly to ensure that we don't sample too early
auto next = std::chrono::steady_clock::now () + config.network_params.node.weight_interval;
condition.wait_until (lock, next, [this, next] {
return stopped || std::chrono::steady_clock::now () >= next;
condition.wait_for (lock, nano::is_dev_run () ? 100ms : 1s, [this] () {
return stopped;
});
if (!stopped)
if (stopped)
{
return;
}
// Always recalculate online weight
update_online ();
// Sample trended weight if the next sample time has been reached
auto const now = std::chrono::steady_clock::now ();
auto const next_sample = last_sample + config.network_params.node.weight_interval;
if (now >= next_sample)
{
trim ();
lock.unlock ();
sample ();
lock.lock ();
last_sample = now;
}
}
}

3
nano/node/online_reps.hpp
View file

@ -64,6 +64,7 @@ private:
void trim_trended (nano::store::write_transaction const &);
/** Iterate over all database samples and remove invalid records. This is meant to clean potential leftovers from previous versions. */
void sanitize_trended (nano::store::write_transaction const &);
void update_online ();
struct trended_result
{
@ -99,6 +100,8 @@ private:
nano::uint128_t cached_trended{0};
nano::uint128_t cached_online{0};
std::chrono::steady_clock::time_point last_sample;
bool stopped{ false };
nano::condition_variable condition;
mutable nano::mutex mutex;