webserver/headers/hlog.hpp

#ifndef HLOG_H
#define HLOG_H

#include <string>
#include <mutex>
#include <memory>
#include <htime.hpp>
#include <cstdarg>

#define LOG hlog::getLogger()->WRITE_LOG

enum class hlog_level
{
    HLOG_INFO,
    HLOG_WARN,
    HLOG_ERR,
    HLOG_CRIT
};

namespace
{
    std::string hlog_level_to_string(const hlog_level &level)
    {
        switch (level)
        {
        case hlog_level::HLOG_INFO:
            return "INFO";
        case hlog_level::HLOG_WARN:
            return "WARNING";
        case hlog_level::HLOG_ERR:
            return "ERROR";
        case hlog_level::HLOG_CRIT:
            return "CRITICAL";
        default:
            return "UNKNOWN";
        }
    }
}

class hlog
{
private:
    static hlog *global_hloger;
    static std::mutex mtx;
    static Htime htimer;
    hlog()
    {
    }

public:
    static hlog *getLogger()
    {
        if (global_hloger == nullptr)
        {
            std::lock_guard<std::mutex> lock(mtx);

            if (global_hloger == nullptr)
            {
                global_hloger = new hlog();
            }
        }

        return global_hloger;
    }

    void WRITE_LOG(hlog_level level, const char *fmt, ...)
    {
        printf("[%s]:[%-10s]--[", htimer.get_local_time_now().c_str(), hlog_level_to_string(level).c_str());

        va_list ap;
        va_start(ap, fmt);
        vprintf(fmt, ap);
        va_end(ap);

        printf("]\n");
    }

    static void destroy()
    {
        if (global_hloger != nullptr)
        {
            delete global_hloger;
            global_hloger = nullptr;
        }
    }
};

hlog *hlog::global_hloger = nullptr;

std::mutex hlog::mtx;

Htime hlog::htimer;

#endif