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[经验分享] MySQL中提取出来的日志

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发表于 2016-11-4 08:31:24 | 显示全部楼层 |阅读模式

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[iyunv@linux tmp]# cat logger.h
#ifndef LOGGER_UTIL_INCLUDED
#define LOGGER_UTIL_INCLUDED
/*
   Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
*/

/**
  A trivial placeholder for inserting Time signatures into streams.
@example cout << Datetime() << "[Info] Today was a sunny day" << endl;
*/

#include <ostream>
#include <string>
#include <sstream>

using namespace std;

struct Datetime {};

ostream &operator<<(ostream &os, const Datetime &dt);

class Gen_spaces
{
public:
  Gen_spaces(int s)
  {
    m_spaces.assign(s,' ');
  }
  ostream &operator<<(ostream &os)
  {
    return os;
  }
  friend ostream &operator<<(ostream &os, const Gen_spaces &gen);
private:
  string m_spaces;
};

ostream &operator<<(ostream &os, const Gen_spaces &gen);

class Log : public ostream
{
public:
  Log(ostream &str, string logclass) :
   ostream(NULL), m_buffer(str, logclass)
  {
    this->init(&m_buffer);
  }
  void enabled(bool s) { m_buffer.enabled(s); }
private:

  class Log_buff : public stringbuf
  {
  public:
    Log_buff(ostream &str, string &logc)
      :m_os(str),m_logc(logc), m_enabled(true)
    {}
    void set_log_class(string &s) { m_logc= s; }
    void enabled(bool s) { m_enabled= s; }
    virtual int sync();
  private:
    ostream &m_os;
    string m_logc;
    bool m_enabled;
  };

  Log_buff m_buffer;
};

#endif /* LOGGER_UTIL_INCLUDED */



[iyunv@linux tmp]# cat logger.cc
/*
   Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA
*/

#include "logger.h"
#include <iostream>
#include <locale>

ostream &operator<<(ostream &os, const Datetime &dt)
{
    const char format[]= "%Y-%m-%d %X";
    time_t t(time(NULL));
    tm tm(*localtime(&t));
    std::locale loc(cout.getloc());
    ostringstream sout;
    const std::time_put<char> &tput =
        std::use_facet<std::time_put<char> >(loc);
    tput.put(sout.rdbuf(), sout, '\0', &tm, &format[0], &format[11]);
    os << sout.str() << " ";
    return os;
}

ostream &operator<<(ostream &os, const Gen_spaces &gen)
{
    return os << gen.m_spaces;
}

int Log::Log_buff::sync()
{
    string sout(str());
    if (m_enabled && sout.length() > 0)
    {
        m_os << Datetime() << "[" << m_logc << "]"<< Gen_spaces(8-m_logc.length()) << sout;
    }
    str("");
    m_os.flush();
    return 0;
}



[iyunv@linux tmp]# cat main.cpp
#include <iostream>
#include "logger.h"

using namespace std;

int main(void)
{
    cout << Datetime() << "[测试] 今天的天气不错!" << endl;
    return 0;
}
[iyunv@linux tmp]# g++ main.cpp  logger.cc && ./a.out
2016-11-03 17:44:09 [测试] 今天的天气不错!
[iyunv@linux tmp]#






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所有资源均系网友上传或者通过网络收集,我们仅提供一个展示、介绍、观摩学习的平台,我们不对其承担任何法律责任,如涉及侵犯版权等问题,请您及时通知我们,我们将立即处理,联系人Email:kefu@iyunv.com,QQ:1061981298 本贴地址:https://www.yunweiku.com/thread-295508-1-1.html 上篇帖子: MySQL中的数值函数 下篇帖子: mysql5.7编译安装
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