winix/core/log.cpp

/*
 * This file is a part of Winix
 * and is not publicly distributed
 * 
 * Copyright (c) 2008-2011, Tomasz Sowa
 * All rights reserved.
 * 
 */
 
#include "log.h"
#include <ctime>
#include <string.h>
#include "utf8.h"


Log::Log()
{
	log_level     = 1;
	current_level = 100; // nothing to log (call Init() first)
	request       = 0;
	max_requests  = 1;
	lines         = 0;
	max_lines     = 5000;
	log_file_open = false;
}


Log::~Log()
{
	SaveLogAndClear();
}


void Log::Init(int log_level_, bool save_each_line_, const std::string & log_file_, bool log_std, int log_max_requests)
{
	log_level      = log_level_;
	log_file       = log_file_;
	log_stdout     = log_std;
	max_requests   = log_max_requests;
	save_each_line = save_each_line_;

	// don't open the file here
	// because it would be created with the root as an owner
}


void Log::OpenFile()
{
	if( !log_file.empty() )
	{
		file.open( log_file.c_str(), std::ios_base::out | std::ios_base::app );
		log_file_open = true;
	}
}


void Log::PutDate(Manipulators m)
{
	// logs are related to localtime

	time_t t = std::time(0);
	std::tm * loct = std::localtime(&t);
	
	char buffer[70];
	sprintf(buffer, "%d.%02d.%02d %02d:%02d:%02d ", int(loct->tm_year + 1900),
	                                                int(loct->tm_mon + 1),
	                                                int(loct->tm_mday), 
	                                                int(loct->tm_hour),
	                                                int(loct->tm_min),
	                                                int(loct->tm_sec));

	(*this) << m << buffer;
}

	
Log & Log::operator<<(const void * s)
{
	if( current_level > log_level )
		return *this;

    buffer << s;
    return *this;
}



Log & Log::operator<<(const char * s)
{
	if( current_level > log_level )
		return *this;

	if( !s )
		return *this;

	buffer << s;
    
return *this;
}



Log & Log::operator<<(const std::string & s)
{
	if( current_level > log_level )
		return *this;

	buffer << s;
    return *this;
}



Log & Log::operator<<(const std::string * s)
{
	if( current_level > log_level )
		return *this;

	buffer << *s;
    return *this;
}






Log & Log::operator<<(const wchar_t * s)
{
	if( current_level <= log_level )
	{
		if( s )
			buffer << s;
	}
    
return *this;
}



Log & Log::operator<<(const std::wstring & s)
{
	if( current_level <= log_level )
	{
		buffer << s;
	}

    return *this;
}



Log & Log::operator<<(const std::wstring * s)
{
	if( current_level <= log_level )
	{
		buffer << *s;
	}

    return *this;
}





Log & Log::operator<<(int s)
{
	if( current_level <= log_level )
	{
		buffer << s;
	}

    return *this;
}



Log & Log::operator<<(long s)
{
	if( current_level <= log_level )
	{
		buffer << s;
	}

    return *this;
}




Log & Log::operator<<(char s)
{
	if( current_level <= log_level )
	{
		buffer << s;
	}

    return *this;
}


Log & Log::operator<<(wchar_t s)
{
	if( current_level <= log_level )
	{
		buffer << s;
	}

    return *this;
}


Log & Log::operator<<(size_t s)
{
	if( current_level <= log_level )
	{
		buffer << s;
	}

    return *this;
}



Log & Log::operator<<(double s)
{
	if( current_level <= log_level )
	{
		buffer << s;
	}

    return *this;
}



Log & Log::operator<<(Manipulators m)
{
	switch(m)
	{
	case logend:
		if( current_level <= log_level )
		{
			buffer << '\n';
			lines += 1;

			if( save_each_line )
				SaveLogAndClear();
		}
		break;

	case logsave:
		SaveLogAndClear();
		break;

	case logendrequest:
		if( ++request >= max_requests || lines > max_lines )
			SaveLogAndClear();
		break;
		
	case log1:
		current_level = 1;
		break;
		
	case log2:
		current_level = 2;
		break;
		
	case log3:
		current_level = 3;
		break;

	case log4:
		current_level = 4;
		break;
	}

return *this;
}



void Log::SystemErr(int err)
{
	(*this) << "errno: " << err;

	const char * err_msg = strerror(err);

	if( err_msg )
		(*this) << " (" << err_msg << ")";
}


void Log::SaveLogAndClear()
{
	SaveLog();

	buffer.Clear();
	request = 0;
	lines   = 0;
}


void Log::SaveLog()
{
	if( buffer.Str().empty() )
		return;

	if( log_stdout )
		Ezc::WideToUTF8(buffer.Str(), std::cout);

	if( log_file.empty() )
		return;

	if( !log_file_open || !file )
	{
		file.close();
		file.clear();

		OpenFile();

		if( !file )
			return;
	}

	Ezc::WideToUTF8(buffer.Str(), file);
	file.flush();
}