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#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
/**
* A buffer, used to construct an ostream that does nothing
* when we output data in it
*/
class NullBuffer: public std::streambuf
{
public:
int overflow(int c) { return c; }
};
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{};
std::ostream stream;
NullBuffer null_buffer;
std::ostream null_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__)
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