day_roll_logger.h

/*
 * day_roll_logger.h
 *
 *  Created on: 2011-10-19
 *      Author: gxl2007@hotmail.com
 */

#ifndef DAY_ROLL_LOGGER_H_
#define DAY_ROLL_LOGGER_H_

#include <time.h>

namespace xlnet
{

/*
 * @brief logger file rolled by day
 */
class day_roll_logger
{
public:
    enum
    {
        LOG_LEVEL_NONE = 0 ,
        LOG_LEVEL_ERROR = 1 ,
        LOG_LEVEL_WARN = 2 ,
        LOG_LEVEL_INFO = 3 ,
        LOG_LEVEL_DEBUG = 4 ,
    } ;

    enum
    {
        MAX_PREFIX_SIZE = 1024 ,
        MAX_LINE_SIZE = 4096 ,
    };

    enum
    {
        NONE_IOBUF_SIZE = 0 ,
        MIN_IOBUF_SIZE = MAX_LINE_SIZE ,
        MAX_IOBUF_SIZE = MAX_LINE_SIZE * 1000 ,
    };
public:
    /*
     * @brief initialize the logger
     * @param [in]: prefix - logger file prefix , prefix-xxxx-xx-xx.log
     * @param [in]: log level
     * @param [in]: buffer size , if < MIN_IOBUF_SIZE , means no buffer
     * @return 0 if success
     */
    int init(const char* prefix,int log_level,int buf_size = NONE_IOBUF_SIZE) ;

    /*
     * @brief clean up
     */
    void fini() ;

    /*
     * @brief write formatted log data
     * @param [in] log level
     * @param [in] format string
     * @param [in] data
     */
    int write_format(int  log_level,const char* fmt,...) ;
    int write_string(int  log_level,const char* content) ;
    //int write_bin(int  log_level,const char* buf,int len) ;

    /*
     * @brief flush buffered data to disk
     */
    int flush() ;

    short get_level() const { return m_level ; } ;
    const char* get_prefix() const { return m_prefix ; } ;

public:
    day_roll_logger();
    ~day_roll_logger();

private:
    day_roll_logger(const day_roll_logger& ) ;
    day_roll_logger& operator=(const day_roll_logger&) ;

private:

    typedef struct
    {
        int size ;
        int pos ;
        char data[0] ;
    } memory_buffer ;

private:
    int prepare() ;

private:
    int m_fd ;
    int m_filedate ;
    short m_level ;
    short m_delay ;
    memory_buffer* m_buf ;
    char m_prefix[MAX_PREFIX_SIZE] ;
    struct tm m_now ;


};

#ifdef NDEBUG
#define write_log_format(logger,level,fmt,args...) \
    do{ logger.write_format(level,fmt,##args);} while(0)
#define write_log_string(logger,level,content) \
    do{ logger.write_string(level,content);} while(0)
#else
#define write_log_format(logger,level, fmt,args...) \
    do{ logger.write_format(level,"[%s:%d]" fmt , __FILE__,__LINE__,##args);} while(0)
#define write_log_string(logger,level,content) \
    do{ logger.write_format(level,"[%s:%d]%s",__FILE__,__LINE__,content);} while(0)
#endif


#define error_log_format(logger, fmt ,args...) write_log_format(logger,xlnet::day_roll_logger::LOG_LEVEL_ERROR, fmt,##args)
#define warn_log_format(logger, fmt ,args...) write_log_format(logger,xlnet::day_roll_logger::LOG_LEVEL_WARN, fmt,##args)
#define info_log_format(logger, fmt ,args...) write_log_format(logger,xlnet::day_roll_logger::LOG_LEVEL_INFO, fmt,##args)

#define error_log_string(logger,content) write_log_string(logger,xlnet::day_roll_logger::LOG_LEVEL_ERROR,content)
#define warn_log_string(logger,content) write_log_string(logger,xlnet::day_roll_logger::LOG_LEVEL_WARN,content)
#define info_log_string(logger,content) write_log_string(logger,xlnet::day_roll_logger::LOG_LEVEL_INFO,content)

#ifdef NDEBUG
#define debug_log_format(logger,fmt,args...)
#define debug_log_string(logger,content)
#else
#define debug_log_format(logger,fmt,args...) write_log_format(logger,xlnet::day_roll_logger::LOG_LEVEL_DEBUG,fmt,##args)
#define debug_log_string(logger,content) write_log_format(logger,xlnet::day_roll_logger::LOG_LEVEL_DEBUG,content)
#endif

}

#endif /* DAY_ROLL_LOGGER_H_ */