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/*
* ZeroTier One - Global Peer to Peer Ethernet
* Copyright (C) 2012-2013 ZeroTier Networks LLC
*
* 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, either version 3 of the License, or
* (at your option) any later version.
*
* 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, see <http://www.gnu.org/licenses/>.
*
* --
*
* ZeroTier may be used and distributed under the terms of the GPLv3, which
* are available at: http://www.gnu.org/licenses/gpl-3.0.html
*
* If you would like to embed ZeroTier into a commercial application or
* redistribute it in a modified binary form, please contact ZeroTier Networks
* LLC. Start here: http://www.zerotier.com/
*/
#ifndef _ZT_LOGGER_HPP
#define _ZT_LOGGER_HPP
#include <stdio.h>
#include <string>
#include <stdexcept>
#include "NonCopyable.hpp"
#include "Mutex.hpp"
#undef LOG
#define LOG(f,...) if (_r->log) _r->log->log(f,##__VA_ARGS__)
#undef TRACE
#ifdef ZT_TRACE
#define TRACE(f,...) if (_r->log) _r->log->trace(__FILE__,__LINE__,f,##__VA_ARGS__)
#else
#define TRACE(f,...) {}
#endif
namespace ZeroTier {
/**
* Utility for outputting logs to a file or stdout/stderr
*/
class Logger : NonCopyable
{
public:
/**
* Construct a logger to log to a file or stdout
*
* If a path is supplied to log to a file, maxLogSize indicates the size
* at which this file is closed, renamed to .old, and then a new log is
* opened (essentially a log rotation). If stdout is used, this is ignored.
*
* @param p Path to log to or NULL to use stdout
* @param prefix Prefix to prepend to log lines or NULL for none
* @param maxLogSize Maximum log size (0 for no limit)
*/
Logger(const char *p,const char *prefix,unsigned long maxLogSize);
~Logger();
void log(const char *fmt,...);
#ifdef ZT_TRACE
void trace(const char *module,unsigned int line,const char *fmt,...);
#else
inline void trace(const char *module,unsigned int line,const char *fmt,...) {}
#endif
private:
void _rotateIfNeeded();
std::string _path;
std::string _prefix;
unsigned long _maxLogSize;
Mutex _log_m;
FILE *_log;
};
} // namespace ZeroTier
#endif
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