MySQL中提取出来的日志
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# 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 02110-1301USA
*/
/**
A trivial placeholder for inserting Time signatures into streams.
@example cout << Datetime() << " 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 */
# 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 02110-1301USA
*/
#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, &format);
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;
}
# 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;
}
# g++ main.cpplogger.cc && ./a.out
2016-11-03 17:44:09 [测试] 今天的天气不错!
#
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