Logger.h

#pragma once

#include <string>

#include "noncopyable.h"

// LOG_INFO("%s %d", arg1, arg2)
#define LOG_INFO(logmsgFormat, ...)                       \
    do                                                    \
    {                                                     \
        Logger &logger = Logger::instance();              \
        logger.setLogLevel(INFO);                         \
        char buf[1024] = {0};                             \
        snprintf(buf, 1024, logmsgFormat, ##__VA_ARGS__); \
        logger.log(buf);                                  \
    } while (0)

#define LOG_ERROR(logmsgFormat, ...)                      \
    do                                                    \
    {                                                     \
        Logger &logger = Logger::instance();              \
        logger.setLogLevel(ERROR);                        \
        char buf[1024] = {0};                             \
        snprintf(buf, 1024, logmsgFormat, ##__VA_ARGS__); \
        logger.log(buf);                                  \
    } while (0)

#define LOG_FATAL(logmsgFormat, ...)                      \
    do                                                    \
    {                                                     \
        Logger &logger = Logger::instance();              \
        logger.setLogLevel(FATAL);                        \
        char buf[1024] = {0};                             \
        snprintf(buf, 1024, logmsgFormat, ##__VA_ARGS__); \
        logger.log(buf);                                  \
        exit(-1);                                         \
    } while (0)

#ifdef MUDEBUG
#define LOG_DEBUG(logmsgFormat, ...)                      \
    do                                                    \
    {                                                     \
        Logger &logger = Logger::instance();              \
        logger.setLogLevel(DEBUG);                        \
        char buf[1024] = {0};                             \
        snprintf(buf, 1024, logmsgFormat, ##__VA_ARGS__); \
        logger.log(buf);                                  \
    } while (0)
#else
#define LOG_DEBUG(logmsgFormat, ...)
#endif

// 定义日志的级别 INFO ERROR FATAL DEBUG
enum LogLevel
{
    INFO,  // 普通信息
    ERROR, // 错误信息
    FATAL, // core dump信息
    DEBUG, // 调试信息
};

// 输出一个日志类

class Logger : noncopyable
{
public:
    // 获取日志唯一的实例对象 单例
    static Logger &instance();
    // 设置日志级别
    void setLogLevel(int level);
    // 写日志
    void log(std::string msg);

private:
    int logLevel_;
};