日志程序

最新推荐文章于 2022-08-16 08:04:44 发布

原创最新推荐文章于 2022-08-16 08:04:44 发布 · 839 阅读

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本文介绍了一个基于C++实现的日志系统设计，包括不同级别的日志输出、日志格式定制及日志文件管理等内容。该系统支持多种日志级别，并能够根据文件大小自动进行滚动备份。

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#ifndef _LOGGER_H_
#define _LOGGER_H_

#include <sstream>

class Logger
{
public:
    typedef enum
    {
        TRACE,
        DEBUG,
        INFO,
        WARN,
        ERROR,
        FATAL,
        LOGLEVEL_COUNT
    }LogLevel;

    Logger(const char *file, int line);
    Logger(const char *file, int line, LogLevel level);
    Logger(const char *file, int line, bool isAbort);
    ~Logger();

    std::ostream& Stream();
    
    static LogLevel GetLevel();
    static void SetLevel(LogLevel level);
    static void SetHandle(int fd);

    static LogLevel _s_level;
    static int _s_fd;
    
private:
    void InitMsgHead(const char *file, int line, LogLevel level = TRACE);
    
private:
    LogLevel _level;
    int _fd;
    std::ostringstream _stream;
};

#define LOG_TRACE if (Logger::GetLevel() <= Logger::TRACE) \
        Logger(__FILE__, __LINE__, Logger::TRACE).Stream()
#define LOG_DEBUG if (Logger::GetLevel() <= Logger::DEBUG) \
        Logger(__FILE__, __LINE__, Logger::DEBUG).Stream()
#define LOG_INFO if (Logger::GetLevel() <= Logger::INFO) \
        Logger(__FILE__, __LINE__).Stream()
#define LOG_WARN Logger(__FILE__, __LINE__, Logger::WARN).Stream()
#define LOG_ERROR Logger(__FILE__, __LINE__, Logger::ERROR).Stream()
#define LOG_FATAL Logger(__FILE__, __LINE__, Logger::FATAL).Stream()
#define LOG_SYSERR Logger(__FILE__, __LINE__, false).Stream()
#define LOG_SYSFATAL Logger(__FILE__, __LINE__, true).Stream()

#endif // _LOGGER_H_

#include "Logger.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sstream>
/// for test
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

Logger::LogLevel Logger::_s_level = Logger::TRACE;
int Logger::_s_fd = 1;

Logger::Logger(const char *file, int line)
{
    InitMsgHead(file, line);
}

Logger::Logger(const char *file, int line, LogLevel level)
{
    InitMsgHead(file, line, level);
}

Logger::Logger(const char *file, int line, bool isAbort)
{
    LogLevel level = (isAbort?FATAL:ERROR);
    InitMsgHead(file, line, level);
}

Logger::~Logger()
{
    std::string buf(_stream.str());
    ssize_t num = ::write(_s_fd, buf.data(), buf.size());
    if (_level == FATAL)
    {
        abort();
    }
}

std::ostream& Logger::Stream()
{
    return _stream;
}

Logger::LogLevel Logger::GetLevel()
{
    return _s_level;
}

void Logger::SetLevel(LogLevel level)
{
    _s_level = level;
}

void Logger::SetHandle(int fd)
{
    _s_fd = fd;
}

void Logger::InitMsgHead(const char *file, int line, LogLevel level)
{
    const char *logLevel[LOGLEVEL_COUNT] =
        {"TRACE", "DEBUG", "INFO", "WARN", "ERROR", "FATAL"};
    char msgHead[128] = {0};
    time_t curtime = time(NULL);
    struct tm *gm = localtime(&curtime);
    const char *pstr = strrchr(file, '/');
    const char *name = ((pstr!=NULL) ? pstr+1 : file);

    _level = level;
    
    snprintf(msgHead, sizeof(msgHead), "[%s\t%04d-%02d-%02d %02d:%02d:%02d %s:%03d]",
             logLevel[_level], gm->tm_year+1900, gm->tm_mon+1, gm->tm_mday,
             gm->tm_hour, gm->tm_min, gm->tm_sec, name, line);
    _stream << msgHead;
}

/////////////////////////test pass//////////////////////////////
int main(void)
{
    /*int fd = open("./log.txt", O_RDWR|O_CREAT|O_APPEND);
    if (-1 == fd)
    {
        printf("open error\n");
    }
    Logger::SetHandle(fd);
    Logger::SetLevel(Logger::ERROR);
    */
    LOG_TRACE << "this is trace\n";
    printf("\n");
    LOG_WARN << "this is warning\n";
    printf("\n");
    LOG_ERROR << "this is error\n";
    printf("\n");
    LOG_SYSERR << "this is system\n";
    printf("\n");
    //LOG_SYSFATAL << "this is sysfatal\n";
    //printf("\n");

    LOG_WARN << "this is last\n";
    getchar();
    
    return 0;
}
//*////////////////////////////////////////////////////////////////

日志监视，当日志文件大小超过1M的时候关闭文件改名保存起来，用相同的路径名重新创建一个日志文件写入日志

int InitLog()
{
    int fd = open(AUDIT_LOG_FILE, O_RDWR|O_CREAT|O_APPEND);
    if (-1 == fd)
    {
        return -1;
    }

    Logger::SetHandle(fd);
    Logger::SetLevel(Logger::DEBUG);
    Logger::SetProcname("hello");

    return 0;
}

/**
 * 监视日志文件
 * @param void
 * @return void
 */
void WatchAuditLog()
{
    char mvCmd[256] = {0};
    struct stat logStat;

    if (fstat(Logger::_s_fd, &logStat))
    {
        return;
    }

    if (logStat.st_size > (1024*1024))
    {
        close(Logger::_s_fd);
        snprintf(mvCmd, sizeof(mvCmd), "mv %s %s", AUDIT_LOG_FILE, AUDIT_LOG_FILE_BAK);
        if (system(mvCmd) < 0)
        {
            return;
        }
        InitLog();
    }
}