h804tun/common.h

#pragma once

#include <iostream>
#include <string>

#ifdef H804_SYSTEMD_ENABLE
#include <systemd/sd-daemon.h>
#endif

namespace h804 {
enum class LogLevel : size_t { DEBUG, INFO, NOTICE, WARN, ERROR, _SIZE };

void daemon_notify_ready();
void daemon_notify(const std::string& args);
void _log(const LogLevel, const std::string&);
void _log(const LogLevel, const char*);

class _Logger {
    LogLevel level;

   public:
    _Logger(LogLevel level);
    void operator<<(const std::string&) const;
    void operator<<(const char*) const;
};

const _Logger debug(LogLevel::DEBUG);
const _Logger info(LogLevel::INFO);
const _Logger notice(LogLevel::NOTICE);
const _Logger warn(LogLevel::WARN);
const _Logger error(LogLevel::ERROR);

class errno_exception : public std::exception {
    const std::string _what;

   public:
    const int saved_errno;
    errno_exception() noexcept;
    errno_exception(const char* msg) noexcept;
    const char* what() const noexcept;
};

void check(long x);
void check(long x, const char* msg);

}  // namespace h804