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Detailed Description

Logging helpers.

Definition in file log.hpp.

#include <chrono>
#include <userver/compiler/select.hpp>
#include <userver/logging/fwd.hpp>
#include <userver/logging/level.hpp>
#include <userver/logging/log_filepath.hpp>
#include <userver/logging/log_helper.hpp>

This graph shows which files directly or indirectly include this file:

Classes
class	logging::DefaultLoggerGuard
	Atomically replaces the default logger. More...

class	logging::DefaultLoggerLevelScope
	Allows to override global log level for the whole service within a scope. Primarily for use in tests. More...

Namespaces
namespace	logging
	Logging macro and utilities.

Macros
#define	LOG_TO(logger, lvl, ...)
	If lvl matches the verbosity then builds a stream and evaluates a message for the specified logger.

#define	LOG(lvl, ...)
	If lvl matches the verbosity then builds a stream and evaluates a message for the default logger.

#define	LOG_TRACE(...) USERVER_IMPL_LOGS_TRACE_ERASER(LOG(USERVER_NAMESPACE::logging::Level::kTrace, __VA_ARGS__))
	Evaluates a message and logs it to the default logger if its level is below or equal to logging::Level::kTrace.

#define	LOG_DEBUG(...) USERVER_IMPL_LOGS_DEBUG_ERASER(LOG(USERVER_NAMESPACE::logging::Level::kDebug, __VA_ARGS__))
	Evaluates a message and logs it to the default logger if its level is below or equal to logging::Level::kDebug.

#define	LOG_INFO(...) USERVER_IMPL_LOGS_INFO_ERASER(LOG(USERVER_NAMESPACE::logging::Level::kInfo, __VA_ARGS__))
	Evaluates a message and logs it to the default logger if its level is below or equal to logging::Level::kInfo.

#define	LOG_WARNING(...) USERVER_IMPL_LOGS_WARNING_ERASER(LOG(USERVER_NAMESPACE::logging::Level::kWarning, __VA_ARGS__))
	Evaluates a message and logs it to the default logger if its level is below or equal to logging::Level::kWarning.

#define	LOG_ERROR(...) USERVER_IMPL_LOGS_ERROR_ERASER(LOG(USERVER_NAMESPACE::logging::Level::kError, __VA_ARGS__))
	Evaluates a message and logs it to the default logger if its level is below or equal to logging::Level::kError.

#define	LOG_CRITICAL(...) LOG(USERVER_NAMESPACE::logging::Level::kCritical, __VA_ARGS__)
	Evaluates a message and logs it to the default logger if its level is below or equal to logging::Level::kCritical.

#define	LOG_TRACE_TO(logger, ...) USERVER_IMPL_LOGS_TRACE_ERASER(LOG_TO(logger, USERVER_NAMESPACE::logging::Level::kTrace, __VA_ARGS__))
	Evaluates a message and logs it to the `logger` if its level is below or equal to logging::Level::kTrace.

#define	LOG_DEBUG_TO(logger, ...) USERVER_IMPL_LOGS_DEBUG_ERASER(LOG_TO(logger, USERVER_NAMESPACE::logging::Level::kDebug, __VA_ARGS__))
	Evaluates a message and logs it to the `logger` if its level is below or equal to logging::Level::kDebug.

#define	LOG_INFO_TO(logger, ...) USERVER_IMPL_LOGS_INFO_ERASER(LOG_TO(logger, USERVER_NAMESPACE::logging::Level::kInfo, __VA_ARGS__))
	Evaluates a message and logs it to the `logger` if its level is below or equal to logging::Level::kInfo.

#define	LOG_WARNING_TO(logger, ...) USERVER_IMPL_LOGS_WARNING_ERASER(LOG_TO(logger, USERVER_NAMESPACE::logging::Level::kWarning, __VA_ARGS__))
	Evaluates a message and logs it to the `logger` if its level is below or equal to logging::Level::kWarning.

#define	LOG_ERROR_TO(logger, ...) USERVER_IMPL_LOGS_ERROR_ERASER(LOG_TO(logger, USERVER_NAMESPACE::logging::Level::kError, __VA_ARGS__))
	Evaluates a message and logs it to the `logger` if its level is below or equal to logging::Level::kError.

#define	LOG_CRITICAL_TO(logger, ...) LOG_TO(logger, USERVER_NAMESPACE::logging::Level::kCritical, __VA_ARGS__)
	Evaluates a message and logs it to the `logger` if its level is below or equal to logging::Level::kCritical.

#define	LOG_LIMITED_TO(logger, lvl, ...)
	If lvl matches the verbosity then builds a stream and evaluates a message for the logger. Ignores log messages that occur too often.

#define	LOG_LIMITED(lvl, ...) LOG_LIMITED_TO(USERVER_NAMESPACE::logging::GetDefaultLogger(), (lvl), __VA_ARGS__)
	If lvl matches the verbosity then builds a stream and evaluates a message for the default logger. Ignores log messages that occur too often.

#define	LOG_LIMITED_TRACE(...) USERVER_IMPL_LOGS_TRACE_ERASER(LOG_LIMITED(USERVER_NAMESPACE::logging::Level::kTrace, __VA_ARGS__))
	Evaluates a message and logs it to the default logger if the log message does not occur too often and default logger level is below or equal to logging::Level::kTrace.

#define	LOG_LIMITED_DEBUG(...) USERVER_IMPL_LOGS_DEBUG_ERASER(LOG_LIMITED(USERVER_NAMESPACE::logging::Level::kDebug, __VA_ARGS__))
	Evaluates a message and logs it to the default logger if the log message does not occur too often and default logger level is below or equal to logging::Level::kDebug.

#define	LOG_LIMITED_INFO(...) USERVER_IMPL_LOGS_INFO_ERASER(LOG_LIMITED(USERVER_NAMESPACE::logging::Level::kInfo, __VA_ARGS__))
	Evaluates a message and logs it to the default logger if the log message does not occur too often and default logger level is below or equal to logging::Level::kInfo.

#define	LOG_LIMITED_WARNING(...) USERVER_IMPL_LOGS_WARNING_ERASER(LOG_LIMITED(USERVER_NAMESPACE::logging::Level::kWarning, __VA_ARGS__))
	Evaluates a message and logs it to the default logger if the log message does not occur too often and default logger level is below or equal to logging::Level::kWarning.

#define	LOG_LIMITED_ERROR(...) USERVER_IMPL_LOGS_ERROR_ERASER(LOG_LIMITED(USERVER_NAMESPACE::logging::Level::kError, __VA_ARGS__))
	Evaluates a message and logs it to the default logger if the log message does not occur too often and default logger level is below or equal to logging::Level::kError.

#define	LOG_LIMITED_CRITICAL(...) LOG_LIMITED(USERVER_NAMESPACE::logging::Level::kCritical, __VA_ARGS__)
	Evaluates a message and logs it to the default logger if the log message does not occur too often and default logger level is below or equal to logging::Level::kCritical.

#define	LOG_LIMITED_TRACE_TO(logger, ...) USERVER_IMPL_LOGS_TRACE_ERASER(LOG_LIMITED_TO(logger, USERVER_NAMESPACE::logging::Level::kTrace, __VA_ARGS__))
	Evaluates a message and logs it to the `logger` if the log message does not occur too often and `logger` level is below or equal to logging::Level::kTrace.

#define	LOG_LIMITED_DEBUG_TO(logger, ...) USERVER_IMPL_LOGS_DEBUG_ERASER(LOG_LIMITED_TO(logger, USERVER_NAMESPACE::logging::Level::kDebug, __VA_ARGS__))
	Evaluates a message and logs it to the `logger` if the log message does not occur too often and `logger` level is below or equal to logging::Level::kDebug.

#define	LOG_LIMITED_INFO_TO(logger, ...) USERVER_IMPL_LOGS_INFO_ERASER(LOG_LIMITED_TO(logger, USERVER_NAMESPACE::logging::Level::kInfo, __VA_ARGS__))
	Evaluates a message and logs it to the `logger` if the log message does not occur too often and `logger` level is below or equal to logging::Level::kInfo.

#define	LOG_LIMITED_WARNING_TO(logger, ...) USERVER_IMPL_LOGS_WARNING_ERASER(LOG_LIMITED_TO(logger, USERVER_NAMESPACE::logging::Level::kWarning, __VA_ARGS__))
	Evaluates a message and logs it to the `logger` if the log message does not occur too often and `logger` level is below or equal to logging::Level::kWarning.

#define	LOG_LIMITED_ERROR_TO(logger, ...) USERVER_IMPL_LOGS_ERROR_ERASER(LOG_LIMITED_TO(logger, USERVER_NAMESPACE::logging::Level::kError, __VA_ARGS__))
	Evaluates a message and logs it to the `logger` if the log message does not occur too often and `logger` level is below or equal to logging::Level::kError.

#define	LOG_LIMITED_CRITICAL_TO(logger, ...) LOG_LIMITED_TO(logger, USERVER_NAMESPACE::logging::Level::kCritical, __VA_ARGS__)
	Evaluates a message and logs it to the `logger` if the log message does not occur too often and `logger` level is below or equal to logging::Level::kCritical.

Functions
LoggerRef	logging::GetDefaultLogger () noexcept
	Returns the default logger previously set by SetDefaultLogger. If the logger was not set - returns a logger that does no logging.

void	logging::SetDefaultLoggerLevel (Level)
	Sets new log level for the default logger.

Level	logging::GetDefaultLoggerLevel () noexcept
	Returns log level for the default logger.

bool	logging::ShouldLog (Level level) noexcept

void	logging::SetLoggerLevel (LoggerRef, Level)
	Sets new log level for a logger.

bool	logging::LoggerShouldLog (LoggerRef logger, Level level) noexcept

bool	logging::LoggerShouldLog (const LoggerPtr &logger, Level level) noexcept

Level	logging::GetLoggerLevel (LoggerRef logger) noexcept

void	logging::LogFlush ()
	Forces flush of default logger message queue.

void	logging::LogFlush (LoggerRef logger)
	Forces flush of `logger` message queue.

Macro Definition Documentation

◆ LOG

#define LOG	(	lvl,
		...
	)

If lvl matches the verbosity then builds a stream and evaluates a message for the default logger.

Definition at line 257 of file log.hpp.

◆ LOG_CRITICAL

#define LOG_CRITICAL ( ... ) LOG(USERVER_NAMESPACE::logging::Level::kCritical, __VA_ARGS__)

Evaluates a message and logs it to the default logger if its level is below or equal to logging::Level::kCritical.

Definition at line 287 of file log.hpp.

◆ LOG_CRITICAL_TO

#define LOG_CRITICAL_TO	(	logger,
		...
	)	LOG_TO(logger, USERVER_NAMESPACE::logging::Level::kCritical, __VA_ARGS__)

Evaluates a message and logs it to the logger if its level is below or equal to logging::Level::kCritical.

Definition at line 324 of file log.hpp.

◆ LOG_DEBUG

#define LOG_DEBUG ( ... ) USERVER_IMPL_LOGS_DEBUG_ERASER(LOG(USERVER_NAMESPACE::logging::Level::kDebug, __VA_ARGS__))

Evaluates a message and logs it to the default logger if its level is below or equal to logging::Level::kDebug.

Examples: postgresql/functional_tests/basic_chaos/postgres_service.cpp, samples/config_service/main.cpp, samples/grpc_service/src/greeter_client.cpp, samples/ydb_service/components/federated_topic_reader.cpp, and samples/ydb_service/components/topic_reader.cpp.

Definition at line 267 of file log.hpp.

◆ LOG_DEBUG_TO

#define LOG_DEBUG_TO	(	logger,
		...
	)	USERVER_IMPL_LOGS_DEBUG_ERASER(LOG_TO(logger, USERVER_NAMESPACE::logging::Level::kDebug, __VA_ARGS__))

Evaluates a message and logs it to the logger if its level is below or equal to logging::Level::kDebug.

Definition at line 300 of file log.hpp.

◆ LOG_ERROR

#define LOG_ERROR ( ... ) USERVER_IMPL_LOGS_ERROR_ERASER(LOG(USERVER_NAMESPACE::logging::Level::kError, __VA_ARGS__))

Evaluates a message and logs it to the default logger if its level is below or equal to logging::Level::kError.

Examples: samples/config_service/main.cpp, samples/grpc_middleware_service/src/middlewares/server/auth.cpp, samples/grpc_middleware_service/src/middlewares/server/meta_filter.cpp, samples/ydb_service/components/federated_topic_reader.cpp, and samples/ydb_service/components/topic_reader.cpp.

Definition at line 282 of file log.hpp.

◆ LOG_ERROR_TO

#define LOG_ERROR_TO	(	logger,
		...
	)	USERVER_IMPL_LOGS_ERROR_ERASER(LOG_TO(logger, USERVER_NAMESPACE::logging::Level::kError, __VA_ARGS__))

Evaluates a message and logs it to the logger if its level is below or equal to logging::Level::kError.

Definition at line 318 of file log.hpp.

◆ LOG_INFO

#define LOG_INFO ( ... ) USERVER_IMPL_LOGS_INFO_ERASER(LOG(USERVER_NAMESPACE::logging::Level::kInfo, __VA_ARGS__))

Evaluates a message and logs it to the default logger if its level is below or equal to logging::Level::kInfo.

Examples: samples/tcp_full_duplex_service/main.cpp, samples/testsuite-support/src/logcapture.cpp, samples/ydb_service/components/federated_topic_reader.cpp, and samples/ydb_service/components/topic_reader.cpp.

Definition at line 272 of file log.hpp.

◆ LOG_INFO_TO

#define LOG_INFO_TO	(	logger,
		...
	)	USERVER_IMPL_LOGS_INFO_ERASER(LOG_TO(logger, USERVER_NAMESPACE::logging::Level::kInfo, __VA_ARGS__))

Evaluates a message and logs it to the logger if its level is below or equal to logging::Level::kInfo.

Definition at line 306 of file log.hpp.

◆ LOG_LIMITED

#define LOG_LIMITED	(	lvl,
		...
	)	LOG_LIMITED_TO(USERVER_NAMESPACE::logging::GetDefaultLogger(), (lvl), __VA_ARGS__)

If lvl matches the verbosity then builds a stream and evaluates a message for the default logger. Ignores log messages that occur too often.

Definition at line 349 of file log.hpp.

◆ LOG_LIMITED_CRITICAL

#define LOG_LIMITED_CRITICAL ( ... ) LOG_LIMITED(USERVER_NAMESPACE::logging::Level::kCritical, __VA_ARGS__)

Evaluates a message and logs it to the default logger if the log message does not occur too often and default logger level is below or equal to logging::Level::kCritical.

Definition at line 390 of file log.hpp.

◆ LOG_LIMITED_CRITICAL_TO

#define LOG_LIMITED_CRITICAL_TO	(	logger,
		...
	)	LOG_LIMITED_TO(logger, USERVER_NAMESPACE::logging::Level::kCritical, __VA_ARGS__)

Evaluates a message and logs it to the logger if the log message does not occur too often and logger level is below or equal to logging::Level::kCritical.

Definition at line 433 of file log.hpp.

◆ LOG_LIMITED_DEBUG

#define LOG_LIMITED_DEBUG ( ... ) USERVER_IMPL_LOGS_DEBUG_ERASER(LOG_LIMITED(USERVER_NAMESPACE::logging::Level::kDebug, __VA_ARGS__))

Evaluates a message and logs it to the default logger if the log message does not occur too often and default logger level is below or equal to logging::Level::kDebug.

Definition at line 362 of file log.hpp.

◆ LOG_LIMITED_DEBUG_TO

#define LOG_LIMITED_DEBUG_TO	(	logger,
		...
	)	USERVER_IMPL_LOGS_DEBUG_ERASER(LOG_LIMITED_TO(logger, USERVER_NAMESPACE::logging::Level::kDebug, __VA_ARGS__))

Evaluates a message and logs it to the logger if the log message does not occur too often and logger level is below or equal to logging::Level::kDebug.

Definition at line 405 of file log.hpp.

◆ LOG_LIMITED_ERROR

#define LOG_LIMITED_ERROR ( ... ) USERVER_IMPL_LOGS_ERROR_ERASER(LOG_LIMITED(USERVER_NAMESPACE::logging::Level::kError, __VA_ARGS__))

Evaluates a message and logs it to the default logger if the log message does not occur too often and default logger level is below or equal to logging::Level::kError.

Definition at line 383 of file log.hpp.

◆ LOG_LIMITED_ERROR_TO

#define LOG_LIMITED_ERROR_TO	(	logger,
		...
	)	USERVER_IMPL_LOGS_ERROR_ERASER(LOG_LIMITED_TO(logger, USERVER_NAMESPACE::logging::Level::kError, __VA_ARGS__))

Evaluates a message and logs it to the logger if the log message does not occur too often and logger level is below or equal to logging::Level::kError.

Definition at line 426 of file log.hpp.

◆ LOG_LIMITED_INFO

#define LOG_LIMITED_INFO ( ... ) USERVER_IMPL_LOGS_INFO_ERASER(LOG_LIMITED(USERVER_NAMESPACE::logging::Level::kInfo, __VA_ARGS__))

Evaluates a message and logs it to the default logger if the log message does not occur too often and default logger level is below or equal to logging::Level::kInfo.

Definition at line 369 of file log.hpp.

◆ LOG_LIMITED_INFO_TO

#define LOG_LIMITED_INFO_TO	(	logger,
		...
	)	USERVER_IMPL_LOGS_INFO_ERASER(LOG_LIMITED_TO(logger, USERVER_NAMESPACE::logging::Level::kInfo, __VA_ARGS__))

Evaluates a message and logs it to the logger if the log message does not occur too often and logger level is below or equal to logging::Level::kInfo.

Definition at line 412 of file log.hpp.

◆ LOG_LIMITED_TO

#define LOG_LIMITED_TO	(	logger,
		lvl,
		...
	)

If lvl matches the verbosity then builds a stream and evaluates a message for the logger. Ignores log messages that occur too often.

Definition at line 335 of file log.hpp.

◆ LOG_LIMITED_TRACE

#define LOG_LIMITED_TRACE ( ... ) USERVER_IMPL_LOGS_TRACE_ERASER(LOG_LIMITED(USERVER_NAMESPACE::logging::Level::kTrace, __VA_ARGS__))

Evaluates a message and logs it to the default logger if the log message does not occur too often and default logger level is below or equal to logging::Level::kTrace.

Definition at line 355 of file log.hpp.

◆ LOG_LIMITED_TRACE_TO

#define LOG_LIMITED_TRACE_TO	(	logger,
		...
	)	USERVER_IMPL_LOGS_TRACE_ERASER(LOG_LIMITED_TO(logger, USERVER_NAMESPACE::logging::Level::kTrace, __VA_ARGS__))

Evaluates a message and logs it to the logger if the log message does not occur too often and logger level is below or equal to logging::Level::kTrace.

Definition at line 398 of file log.hpp.

◆ LOG_LIMITED_WARNING

#define LOG_LIMITED_WARNING ( ... ) USERVER_IMPL_LOGS_WARNING_ERASER(LOG_LIMITED(USERVER_NAMESPACE::logging::Level::kWarning, __VA_ARGS__))

Evaluates a message and logs it to the default logger if the log message does not occur too often and default logger level is below or equal to logging::Level::kWarning.

Definition at line 376 of file log.hpp.

◆ LOG_LIMITED_WARNING_TO

#define LOG_LIMITED_WARNING_TO	(	logger,
		...
	)	USERVER_IMPL_LOGS_WARNING_ERASER(LOG_LIMITED_TO(logger, USERVER_NAMESPACE::logging::Level::kWarning, __VA_ARGS__))

Evaluates a message and logs it to the logger if the log message does not occur too often and logger level is below or equal to logging::Level::kWarning.

Definition at line 419 of file log.hpp.

◆ LOG_TO

#define LOG_TO	(	logger,
		lvl,
		...
	)

If lvl matches the verbosity then builds a stream and evaluates a message for the specified logger.

Definition at line 245 of file log.hpp.

◆ LOG_TRACE

#define LOG_TRACE ( ... ) USERVER_IMPL_LOGS_TRACE_ERASER(LOG(USERVER_NAMESPACE::logging::Level::kTrace, __VA_ARGS__))

Evaluates a message and logs it to the default logger if its level is below or equal to logging::Level::kTrace.

Definition at line 262 of file log.hpp.

◆ LOG_TRACE_TO

#define LOG_TRACE_TO	(	logger,
		...
	)	USERVER_IMPL_LOGS_TRACE_ERASER(LOG_TO(logger, USERVER_NAMESPACE::logging::Level::kTrace, __VA_ARGS__))

Evaluates a message and logs it to the logger if its level is below or equal to logging::Level::kTrace.

Definition at line 294 of file log.hpp.

◆ LOG_WARNING

#define LOG_WARNING ( ... ) USERVER_IMPL_LOGS_WARNING_ERASER(LOG(USERVER_NAMESPACE::logging::Level::kWarning, __VA_ARGS__))

Evaluates a message and logs it to the default logger if its level is below or equal to logging::Level::kWarning.

Examples: grpc-generic-proxy/src/proxy_service.cpp, samples/ydb_service/components/federated_topic_reader.cpp, and samples/ydb_service/components/topic_reader.cpp.

Definition at line 277 of file log.hpp.

◆ LOG_WARNING_TO

#define LOG_WARNING_TO	(	logger,
		...
	)	USERVER_IMPL_LOGS_WARNING_ERASER(LOG_TO(logger, USERVER_NAMESPACE::logging::Level::kWarning, __VA_ARGS__))

Evaluates a message and logs it to the logger if its level is below or equal to logging::Level::kWarning.

Definition at line 312 of file log.hpp.

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