logging Namespace Reference

Detailed Description

Logging macro and utilities.

Namespaces
namespace	stacktrace_cache
	Contains functions that cache stacktrace results.

Classes
class	DefaultLoggerGuard
	Atomically replaces the default logger. More...
class	DefaultLoggerLevelScope
	Allows to override default log level within a scope. Primarily for use in tests. More...
struct	Hex
	Formats value in a hex mode with the fixed length representation. More...
struct	HexShort
class	LogExtra
	Extra tskv fields storage. More...
class	LogHelper
struct	Quoted
	Formats a string as quoted, escaping the '\' and '"' symbols. More...

Typedefs
using	LoggerRef = impl::LoggerBase&
using	LoggerPtr = std::shared_ptr<impl::LoggerBase>

Enumerations
enum class	Level : std::uint8_t {   kTrace = 0 ,   kDebug = 1 ,   kInfo = 2 ,   kWarning = 3 ,   kError = 4 ,   kCritical = 5 ,   kNone = 6 }
	Log levels. More...
enum class	Format {   kTskv ,   kLtsv ,   kRaw }
	Log formats. More...

Functions
LoggerRef	GetDefaultLogger () noexcept
	Returns the default logger previously set by SetDefaultLogger. If the logger was not set - returns a logger that does no logging.
void	SetDefaultLoggerLevel (Level)
	Sets new log level for the default logger.
Level	GetDefaultLoggerLevel () noexcept
	Returns log level for the default logger.
bool	ShouldLog (Level level) noexcept
void	SetLoggerLevel (LoggerRef, Level)
	Sets new log level for a logger.
bool	LoggerShouldLog (LoggerRef logger, Level level) noexcept
bool	LoggerShouldLog (const LoggerPtr &logger, Level level) noexcept
Level	GetLoggerLevel (LoggerRef logger) noexcept
void	LogFlush ()
	Forces flush of default logger message queue.
void	LogFlush (LoggerRef logger)
	Forces flush of logger message queue.
Level	LevelFromString (std::string_view)
	Converts lowercase level name to a corresponding Level, throws std::runtime_error if no matching log level found.
std::string_view	ToString (Level level)
	Returns a string representation of logging level, e.g. "info".
std::string_view	ToUpperCaseString (Level level) noexcept
	Returns a string representation of logging level, e.g. "INFO".
std::optional< Level >	OptionalLevelFromString (const std::optional< std::string > &level_name)
	Returns std::nullopt if level_name is std::nullopt, otherwise behaves exactly like logging::LevelFromString.
LogHelper &	operator<< (LogHelper &lh, std::error_code ec)
template<typename T >
LogHelper &	operator<< (LogHelper &lh, const std::atomic< T > &value)
template<typename T >
LogHelper &	operator<< (LogHelper &lh, const T *value) noexcept
template<typename T >
LogHelper &	operator<< (LogHelper &lh, T *value)
template<typename T >
LogHelper &	operator<< (LogHelper &lh, const std::optional< T > &value)
template<class Result , class... Args>
LogHelper &	operator<< (LogHelper &lh, Result(*)(Args...))
LogHelper &	operator<< (LogHelper &lh, std::chrono::system_clock::time_point tp)
LogHelper &	operator<< (LogHelper &lh, std::chrono::seconds value)
LogHelper &	operator<< (LogHelper &lh, std::chrono::milliseconds value)
LogHelper &	operator<< (LogHelper &lh, std::chrono::microseconds value)
LogHelper &	operator<< (LogHelper &lh, std::chrono::nanoseconds value)
LogHelper &	operator<< (LogHelper &lh, std::chrono::minutes value)
LogHelper &	operator<< (LogHelper &lh, std::chrono::hours value)
Format	FormatFromString (std::string_view format_str)
	Parse Format enum from string.
template<typename... Types>
LogHelper &	operator<< (LogHelper &lh, const std::tuple< Types... > &value)
LoggerRef	GetNullLogger () noexcept
	Returns a logger that drops all incoming messages.
LoggerPtr	MakeNullLogger ()
	Creates a logger that drops all incoming messages.
Level	Parse (const yaml_config::YamlConfig &value, formats::parse::To< Level >)
Level	Parse (const formats::json::Value &value, formats::parse::To< Level >)
LoggerPtr	MakeStderrLogger (const std::string &name, Format format, Level level=Level::kInfo)
	Creates synchronous stderr logger with default tskv pattern.
LoggerPtr	MakeStdoutLogger (const std::string &name, Format format, Level level=Level::kInfo)
	Creates synchronous stdout logger with default tskv pattern.
LoggerPtr	MakeFileLogger (const std::string &name, const std::string &path, Format format, Level level=Level::kInfo)
	Creates synchronous file logger with default tskv pattern.

Variables
constexpr auto	kLevelMax = static_cast<int>(Level::kNone)
const LogExtra	kEmptyLogExtra

Typedef Documentation

LoggerPtr

using logging::LoggerPtr = std::shared_ptr<impl::LoggerBase>

Definition at line 19 of file fwd.hpp.

LoggerRef

using logging::LoggerRef = impl::LoggerBase&

Definition at line 18 of file fwd.hpp.

Enumeration Type Documentation

Format

enum class logging::Format

strong

Log formats.

Definition at line 13 of file format.hpp.

Level

enum class logging::Level : std::uint8_t

strong

Log levels.

Definition at line 16 of file level.hpp.

Function Documentation

GetDefaultLogger()

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.

Note

While the coroutine engine is running, any reference to the default logger is guaranteed to be alive. No lifetime guarantees are given for the default logger reference outside the engine's lifetime. The rule of thumb there is not to keep this reference in any extended scope.

GetNullLogger()

LoggerRef logging::GetNullLogger ( )

noexcept

Returns a logger that drops all incoming messages.

See also

components::Logging

MakeFileLogger()

LoggerPtr logging::MakeFileLogger	(	const std::string &	name,
		const std::string &	path,
		Format	format,
		Level	level = Level::kInfo )

Creates synchronous file logger with default tskv pattern.

Parameters

name	logger name, for internal use, must be unique
path	target log file path

See also

components::Logging

MakeNullLogger()

LoggerPtr logging::MakeNullLogger

(

)

Creates a logger that drops all incoming messages.

Use GetNullLogger() is you need a reference to logger.

See also

components::Logging

MakeStderrLogger()

LoggerPtr logging::MakeStderrLogger	(	const std::string &	name,
		Format	format,
		Level	level = Level::kInfo )

Creates synchronous stderr logger with default tskv pattern.

Parameters

name	logger name, for internal use, must be unique

See also

components::Logging

MakeStdoutLogger()

LoggerPtr logging::MakeStdoutLogger	(	const std::string &	name,
		Format	format,
		Level	level = Level::kInfo )

Creates synchronous stdout logger with default tskv pattern.

Parameters

name	logger name, for internal use, must be unique

See also

components::Logging

operator<<() [1/7]

template<typename T >

LogHelper & logging::operator<<	(	LogHelper &	lh,
		const std::atomic< T > &	value )

Definition at line 218 of file log_helper.hpp.

operator<<() [2/7]

template<typename T >

LogHelper & logging::operator<<	(	LogHelper &	lh,
		const std::optional< T > &	value )

Definition at line 240 of file log_helper.hpp.

operator<<() [3/7]

template<typename... Types>

LogHelper & logging::operator<<	(	LogHelper &	lh,
		const std::tuple< Types... > &	value )

Definition at line 15 of file log_helper_extras.hpp.

operator<<() [4/7]

template<typename T >

LogHelper & logging::operator<< ( LogHelper & lh, const T * value )

noexcept

Definition at line 223 of file log_helper.hpp.

operator<<() [5/7]

template<class Result , class... Args>

LogHelper & logging::operator<<	(	LogHelper &	lh,
		Result(*)(Args...)	)

Definition at line 249 of file log_helper.hpp.

operator<<() [6/7]

LogHelper & logging::operator<< ( LogHelper & lh, std::error_code ec )

inline

Definition at line 212 of file log_helper.hpp.

operator<<() [7/7]

template<typename T >

LogHelper & logging::operator<<	(	LogHelper &	lh,
		T *	value )

Definition at line 235 of file log_helper.hpp.

SetDefaultLoggerLevel()

void logging::SetDefaultLoggerLevel

(

Level

)

Sets new log level for the default logger.

Note

Prefer using logging::DefaultLoggerLevelScope if possible

ShouldLog()

bool logging::ShouldLog ( Level level )

noexcept

Returns true if the provided log level is greater or equal to the current log level and to the tracing::Span (if any) local log level.

Variable Documentation

kLevelMax

constexpr auto logging::kLevelMax = static_cast<int>(Level::kNone)

inlineconstexpr

Definition at line 26 of file level.hpp.