level.hpp

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#pragma once
 
/// @file userver/logging/level.hpp
/// @brief Log levels
 
#include <cstdint>
#include <optional>
#include <string>
 
USERVER_NAMESPACE_BEGIN
 
/// Logging macro and utilities
namespace logging {
 
/// Log levels
enum class Level : std::uint8_t {
    kTrace = 0,
    kDebug = 1,
    kInfo = 2,
    kWarning = 3,
    kError = 4,
    kCritical = 5,
    kNone = 6
};
 
inline constexpr auto kLevelMax = static_cast<int>(Level::kNone);
 
/// @brief Converts lowercase level name to a corresponding Level, throws
/// std::runtime_error if no matching log level found.
Level LevelFromString(std::string_view);
 
/// @brief Returns a string representation of logging level, e.g. "info"
std::string_view ToString(Level level);
 
/// @brief Returns a string representation of logging level, e.g. "INFO"
std::string_view ToUpperCaseString(Level level) noexcept;
 
/// @brief Returns std::nullopt if level_name is std::nullopt, otherwise
/// behaves exactly like logging::LevelFromString.
std::optional<Level> OptionalLevelFromString(const std::optional<std::string>& level_name);
 
}  // namespace logging
 
USERVER_NAMESPACE_END