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#include <Common/DateLUT.h>
#include <Common/LoggingFormatStringHelpers.h>
#include <Common/SipHash.h>
#include <Common/thread_local_rng.h>
[[noreturn]] void functionThatFailsCompilationOfConstevalFunctions(const char * error)
{
throw std::runtime_error(error);
}
std::unordered_map<UInt64, std::pair<time_t, size_t>> LogFrequencyLimiterIml::logged_messages;
time_t LogFrequencyLimiterIml::last_cleanup = 0;
std::mutex LogFrequencyLimiterIml::mutex;
void LogFrequencyLimiterIml::log(Poco::Message & message)
{
#if 0
std::string_view pattern = message.getFormatString();
if (pattern.empty())
{
/// Do not filter messages without a format string
if (auto * channel = logger->getChannel())
channel->log(message);
return;
}
SipHash hash;
hash.update(logger->name());
/// Format strings are compile-time constants, so they are uniquely identified by pointer and size
hash.update(pattern.data());
hash.update(pattern.size());
time_t now = time(nullptr);
size_t skipped_similar_messages = 0;
bool need_cleanup;
bool need_log;
{
std::lock_guard lock(mutex);
need_cleanup = last_cleanup + 300 <= now;
auto & info = logged_messages[hash.get64()];
need_log = info.first + min_interval_s <= now;
if (need_log)
{
skipped_similar_messages = info.second;
info.first = now;
info.second = 0;
}
else
{
++info.second;
}
}
/// We don't need all threads to do cleanup, just randomize
if (need_cleanup && thread_local_rng() % 100 == 0)
cleanup();
/// The message it too frequent, skip it for now
/// NOTE It's not optimal because we format the message first and only then check if we need to actually write it, see LOG_IMPL macro
if (!need_log)
return;
if (skipped_similar_messages)
message.appendText(fmt::format(" (skipped {} similar messages)", skipped_similar_messages));
#endif
if (auto * channel = logger->getChannel())
channel->log(message);
}
void LogFrequencyLimiterIml::cleanup(time_t too_old_threshold_s)
{
time_t now = time(nullptr);
time_t old = now - too_old_threshold_s;
std::lock_guard lock(mutex);
std::erase_if(logged_messages, [old](const auto & elem) { return elem.second.first < old; });
last_cleanup = now;
}
std::mutex LogSeriesLimiter::mutex;
time_t LogSeriesLimiter::last_cleanup = 0;
LogSeriesLimiter::LogSeriesLimiter(Poco::Logger * logger_, size_t allowed_count_, time_t interval_s_)
: logger(logger_)
{
if (allowed_count_ == 0)
{
accepted = false;
return;
}
if (interval_s_ == 0)
{
accepted = true;
return;
}
time_t now = time(nullptr);
UInt128 name_hash = sipHash128(logger->name().c_str(), logger->name().size());
std::lock_guard lock(mutex);
if (last_cleanup == 0)
last_cleanup = now;
auto & series_records = getSeriesRecords();
static const time_t cleanup_delay_s = 600;
if (last_cleanup + cleanup_delay_s >= now)
{
time_t old = now - cleanup_delay_s;
std::erase_if(series_records, [old](const auto & elem) { return get<0>(elem.second) < old; });
last_cleanup = now;
}
auto register_as_first = [&] () TSA_REQUIRES(mutex)
{
assert(allowed_count_ > 0);
accepted = true;
series_records[name_hash] = std::make_tuple(now, 1, 1);
};
if (!series_records.contains(name_hash))
{
register_as_first();
return;
}
auto & [last_time, accepted_count, total_count] = series_records[name_hash];
if (last_time + interval_s_ <= now)
{
debug_message = fmt::format(
" (LogSeriesLimiter: on interval from {} to {} accepted series {} / {} for the logger {} : {})",
DateLUT::instance().timeToString(last_time),
DateLUT::instance().timeToString(now),
accepted_count,
total_count,
logger->name(),
double(name_hash));
register_as_first();
return;
}
if (accepted_count < allowed_count_)
{
accepted = true;
++accepted_count;
}
++total_count;
}
void LogSeriesLimiter::log(Poco::Message & message)
{
#if 0
std::string_view pattern = message.getFormatString();
if (pattern.empty())
{
/// Do not filter messages without a format string
if (auto * channel = logger->getChannel())
channel->log(message);
return;
}
if (!accepted)
return;
if (!debug_message.empty())
{
message.appendText(debug_message);
debug_message.clear();
}
#endif
if (auto * channel = logger->getChannel())
channel->log(message);
}
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