diff options
Diffstat (limited to 'louloulibs/logger')
-rw-r--r-- | louloulibs/logger/logger.cpp | 38 | ||||
-rw-r--r-- | louloulibs/logger/logger.hpp | 126 |
2 files changed, 164 insertions, 0 deletions
diff --git a/louloulibs/logger/logger.cpp b/louloulibs/logger/logger.cpp new file mode 100644 index 0000000..7336579 --- /dev/null +++ b/louloulibs/logger/logger.cpp @@ -0,0 +1,38 @@ +#include <logger/logger.hpp> +#include <config/config.hpp> + +Logger::Logger(const int log_level): + log_level(log_level), + stream(std::cout.rdbuf()) +{ +} + +Logger::Logger(const int log_level, const std::string& log_file): + log_level(log_level), + ofstream(log_file.data(), std::ios_base::app), + stream(ofstream.rdbuf()) +{ +} + +std::unique_ptr<Logger>& Logger::instance() +{ + static std::unique_ptr<Logger> instance; + + if (!instance) + { + const std::string log_file = Config::get("log_file", ""); + const int log_level = Config::get_int("log_level", 0); + if (log_file.empty()) + instance = std::make_unique<Logger>(log_level); + else + instance = std::make_unique<Logger>(log_level, log_file); + } + return instance; +} + +std::ostream& Logger::get_stream(const int lvl) +{ + if (lvl >= this->log_level) + return this->stream; + return this->null_stream; +} diff --git a/louloulibs/logger/logger.hpp b/louloulibs/logger/logger.hpp new file mode 100644 index 0000000..0893c77 --- /dev/null +++ b/louloulibs/logger/logger.hpp @@ -0,0 +1,126 @@ +#pragma once + + +/** + * Singleton used in logger macros to write into files or stdout, with + * various levels of severity. + * Only the macros should be used. + * @class Logger + */ + +#include <memory> +#include <iostream> +#include <fstream> + +#define debug_lvl 0 +#define info_lvl 1 +#define warning_lvl 2 +#define error_lvl 3 + +#include "louloulibs.h" +#ifdef SYSTEMD_FOUND +# include <systemd/sd-daemon.h> +#else +# define SD_DEBUG "[DEBUG]: " +# define SD_INFO "[INFO]: " +# define SD_WARNING "[WARNING]: " +# define SD_ERR "[ERROR]: " +#endif + +// Macro defined to get the filename instead of the full path. But if it is +// not properly defined by the build system, we fallback to __FILE__ +#ifndef __FILENAME__ +# define __FILENAME__ __FILE__ +#endif + +/** + * Juste a structure representing a stream doing nothing with its input. + */ +class nullstream: public std::ostream +{ +public: + nullstream(): + std::ostream(0) + { } +}; + +class Logger +{ +public: + static std::unique_ptr<Logger>& instance(); + std::ostream& get_stream(const int); + Logger(const int log_level, const std::string& log_file); + Logger(const int log_level); + + Logger(const Logger&) = delete; + Logger& operator=(const Logger&) = delete; + Logger(Logger&&) = delete; + Logger& operator=(Logger&&) = delete; + +private: + const int log_level; + std::ofstream ofstream; + nullstream null_stream; + std::ostream stream; +}; + +#define WHERE __FILENAME__, ":", __LINE__, ":\t" + +namespace logging_details +{ + template <typename T> + void log(std::ostream& os, const T& arg) + { + os << arg << std::endl; + } + + template <typename T, typename... U> + void log(std::ostream& os, const T& first, U&&... rest) + { + os << first; + log(os, std::forward<U>(rest)...); + } + + template <typename... U> + void log_debug(U&&... args) + { + auto& os = Logger::instance()->get_stream(debug_lvl); + os << SD_DEBUG; + log(os, std::forward<U>(args)...); + } + + template <typename... U> + void log_info(U&&... args) + { + auto& os = Logger::instance()->get_stream(info_lvl); + os << SD_INFO; + log(os, std::forward<U>(args)...); + } + + template <typename... U> + void log_warning(U&&... args) + { + auto& os = Logger::instance()->get_stream(warning_lvl); + os << SD_WARNING; + log(os, std::forward<U>(args)...); + } + + template <typename... U> + void log_error(U&&... args) + { + auto& os = Logger::instance()->get_stream(error_lvl); + os << SD_ERR; + log(os, std::forward<U>(args)...); + } +} + +#define log_info(...) logging_details::log_info(WHERE, __VA_ARGS__) + +#define log_warning(...) logging_details::log_warning(WHERE, __VA_ARGS__) + +#define log_error(...) logging_details::log_error(WHERE, __VA_ARGS__) + +#define log_debug(...) logging_details::log_debug(WHERE, __VA_ARGS__) + + + |