assimp.assimp/code/DefaultLogger.cpp

/*
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Open Asset Import Library (ASSIMP)
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Copyright (c) 2006-2008, ASSIMP Development Team

All rights reserved.

Redistribution and use of this software in source and binary forms, 
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* Redistributions of source code must retain the above
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  following disclaimer.

* Redistributions in binary form must reproduce the above
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  derived from this software without specific prior
  written permission of the ASSIMP Development Team.

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*/

/** @file  DefaultLogger.cpp
 *  @brief Implementation of DefaultLogger (and Logger)
 */

#include "AssimpPCH.h"
#include "DefaultIOSystem.h"

// Default log streams
#include "Win32DebugLogStream.h"
#include "StdOStreamLogStream.h"
#include "FileLogStream.h"

#ifndef ASSIMP_BUILD_SINGLETHREADED
#	include <boost/thread/thread.hpp>
#	include <boost/thread/mutex.hpp>

boost::mutex loggerMutex;
#endif

namespace Assimp	{

// ----------------------------------------------------------------------------------
NullLogger DefaultLogger::s_pNullLogger;
Logger *DefaultLogger::m_pLogger = &DefaultLogger::s_pNullLogger;

// ----------------------------------------------------------------------------------
// Represents a logstream + its error severity
struct LogStreamInfo
{
	unsigned int m_uiErrorSeverity;
	LogStream *m_pStream;

	// Constructor
	LogStreamInfo( unsigned int uiErrorSev, LogStream *pStream ) :
		m_uiErrorSeverity( uiErrorSev ),
		m_pStream( pStream )
	{
		// empty
	}
	
	// Destructor
	~LogStreamInfo()
	{
		// empty
	}
};

// ----------------------------------------------------------------------------------
// Construct a default log stream
LogStream* LogStream::createDefaultStream(DefaultLogStreams	streams,
	const char* name /*= "AssimpLog.txt"*/,
	IOSystem* io		    /*= NULL*/)
{
	switch (streams)	
	{
		// This is a platform-specific feature
	case DLS_DEBUGGER:
#ifdef WIN32
		return new Win32DebugLogStream();
#else
		return NULL;
#endif

		// Platform-independent default streams
	case DLS_CERR:
		return new StdOStreamLogStream(std::cerr);
	case DLS_COUT:
		return new StdOStreamLogStream(std::cout);
	case DLS_FILE:
		return (name && *name ? new FileLogStream(name,io) : NULL);
	default:
		// We don't know this default log stream, so raise an assertion
		ai_assert(false);

	};

	// For compilers without dead code path detection
	return NULL;
}

// ----------------------------------------------------------------------------------
//	Creates the only singleton instance
Logger *DefaultLogger::create(const char* name /*= "AssimpLog.txt"*/,
	LogSeverity severity                       /*= NORMAL*/,
	unsigned int defStreams                    /*= DLS_DEBUGGER | DLS_FILE*/,
	IOSystem* io		                       /*= NULL*/)
{
	// enter the mutex here to avoid concurrency problems
#ifndef ASSIMP_BUILD_SINGLETHREADED
	boost::mutex::scoped_lock lock(loggerMutex);
#endif

	if (m_pLogger && !isNullLogger() )
		delete m_pLogger;

	m_pLogger = new DefaultLogger( severity );

	// Attach default log streams
	// Stream the log to the MSVC debugger?
	if (defStreams & DLS_DEBUGGER)
		m_pLogger->attachStream( LogStream::createDefaultStream(DLS_DEBUGGER));

	// Stream the log to COUT?
	if (defStreams & DLS_COUT)
		m_pLogger->attachStream( LogStream::createDefaultStream(DLS_COUT));

	// Stream the log to CERR?
	if (defStreams & DLS_CERR)
		 m_pLogger->attachStream( LogStream::createDefaultStream(DLS_CERR));
	
	// Stream the log to a file
	if (defStreams & DLS_FILE && name && *name)
		m_pLogger->attachStream( LogStream::createDefaultStream(DLS_FILE,name,io));

	return m_pLogger;
}

// ----------------------------------------------------------------------------------
void Logger::debug(const std::string &message)	{

	// SECURITY FIX: otherwise it's easy to produce overruns ...
	if (message.length()>MAX_LOG_MESSAGE_LENGTH) {
		ai_assert(false);
		return;
	}
	return OnDebug(message.c_str());
}

// ----------------------------------------------------------------------------------
void Logger::info(const std::string &message)	{
	
	// SECURITY FIX: otherwise it's easy to produce overruns ...
	if (message.length()>MAX_LOG_MESSAGE_LENGTH) {
		ai_assert(false);
		return;
	}
	return OnInfo(message.c_str());
}
	
// ----------------------------------------------------------------------------------
void Logger::warn(const std::string &message)	{
	
	// SECURITY FIX: otherwise it's easy to produce overruns ...
	if (message.length()>MAX_LOG_MESSAGE_LENGTH) {
		ai_assert(false);
		return;
	}
	return OnWarn(message.c_str());
}

// ----------------------------------------------------------------------------------
void Logger::error(const std::string &message)	{
	
	// SECURITY FIX: otherwise it's easy to produce overruns ...
	if (message.length()>MAX_LOG_MESSAGE_LENGTH) {
		ai_assert(false);
		return;
	}
	return OnError(message.c_str());
}

// ----------------------------------------------------------------------------------
void DefaultLogger::set( Logger *logger )
{
	// enter the mutex here to avoid concurrency problems
#ifndef ASSIMP_BUILD_SINGLETHREADED
	boost::mutex::scoped_lock lock(loggerMutex);
#endif

	if (!logger)logger = &s_pNullLogger;
	if (m_pLogger && !isNullLogger() )
		delete m_pLogger;

	DefaultLogger::m_pLogger = logger;
}

// ----------------------------------------------------------------------------------
bool DefaultLogger::isNullLogger()
{
	return m_pLogger == &s_pNullLogger;
}

// ----------------------------------------------------------------------------------
//	Singleton getter
Logger *DefaultLogger::get()
{
	return m_pLogger;
}

// ----------------------------------------------------------------------------------
//	Kills the only instance
void DefaultLogger::kill()
{
	// enter the mutex here to avoid concurrency problems
#ifndef ASSIMP_BUILD_SINGLETHREADED
	boost::mutex::scoped_lock lock(loggerMutex);
#endif

	if (m_pLogger != &s_pNullLogger)return;
	delete m_pLogger;
	m_pLogger = &s_pNullLogger;
}

// ----------------------------------------------------------------------------------
//	Debug message
void DefaultLogger::OnDebug( const char* message )
{
	if ( m_Severity == Logger::NORMAL )
		return;

	char msg[MAX_LOG_MESSAGE_LENGTH*2];
	::sprintf(msg,"Debug, T%i: %s", GetThreadID(), message );

	WriteToStreams( msg, Logger::DEBUGGING );
}

// ----------------------------------------------------------------------------------
//	Logs an info
void DefaultLogger::OnInfo( const char* message )
{
	char msg[MAX_LOG_MESSAGE_LENGTH*2];
	::sprintf(msg,"Info,  T%i: %s", GetThreadID(), message );

	WriteToStreams( msg , Logger::INFO );
}

// ----------------------------------------------------------------------------------
//	Logs a warning
void DefaultLogger::OnWarn( const char* message )
{
	char msg[MAX_LOG_MESSAGE_LENGTH*2];
	::sprintf(msg,"Warn,  T%i: %s", GetThreadID(), message );

	WriteToStreams( msg, Logger::WARN );
}

// ----------------------------------------------------------------------------------
//	Logs an error
void DefaultLogger::OnError( const char* message )
{
	char msg[MAX_LOG_MESSAGE_LENGTH*2];
	::sprintf(msg,"Error, T%i: %s", GetThreadID(), message );

	WriteToStreams( msg, Logger::ERR );
}

// ----------------------------------------------------------------------------------
//	Attachs a new stream
bool DefaultLogger::attachStream( LogStream *pStream, unsigned int severity )
{
	if (!pStream)
		return false;

	if (0 == severity)	{
		severity = Logger::INFO | Logger::ERR | Logger::WARN | Logger::DEBUGGING;
	}

	for ( StreamIt it = m_StreamArray.begin();
		it != m_StreamArray.end();
		++it )
	{
		if ( (*it)->m_pStream == pStream )
		{
			(*it)->m_uiErrorSeverity |= severity;
			return true;
		}
	}
	
	LogStreamInfo *pInfo = new LogStreamInfo( severity, pStream );
	m_StreamArray.push_back( pInfo );
	return true;
}

// ----------------------------------------------------------------------------------
//	Detatch a stream
bool DefaultLogger::detatchStream( LogStream *pStream, unsigned int severity )
{
	if (!pStream)
		return false;

	if (0 == severity)	{
		severity = Logger::INFO | Logger::ERR | Logger::WARN | Logger::DEBUGGING;
	}
	
	for ( StreamIt it = m_StreamArray.begin();
		it != m_StreamArray.end();
		++it )
	{
		if ( (*it)->m_pStream == pStream )
		{
			(*it)->m_uiErrorSeverity &= ~severity;
			if ( (*it)->m_uiErrorSeverity == 0 )
			{
				m_StreamArray.erase( it );
				break;
			}
			return true;
		}
	}
	return false;
}

// ----------------------------------------------------------------------------------
//	Constructor
DefaultLogger::DefaultLogger(LogSeverity severity) 

	:	Logger	( severity )
	,	noRepeatMsg	(false)
	,	lastLen( 0 )
{
	lastMsg[0] = '\0';
}

// ----------------------------------------------------------------------------------
//	Destructor
DefaultLogger::~DefaultLogger()
{
	for ( StreamIt it = m_StreamArray.begin(); it != m_StreamArray.end(); ++it )
		delete *it;
}

// ----------------------------------------------------------------------------------
//	Writes message to stream
void DefaultLogger::WriteToStreams(const char *message, 
	ErrorSeverity ErrorSev )
{
	ai_assert(NULL != message);

	// Check whether this is a repeated message
	if (! ::strncmp( message,lastMsg, lastLen-1))
	{
		if (!noRepeatMsg)
		{
			noRepeatMsg = true;
			message = "Skipping one or more lines with the same contents\n";
		}
		else return;
	}
	else
	{
		// append a new-line character to the message to be printed
		lastLen = ::strlen(message);
		::memcpy(lastMsg,message,lastLen+1);
		::strcat(lastMsg+lastLen,"\n");

		message = lastMsg;
		noRepeatMsg = false;
		++lastLen;
	}
	for ( ConstStreamIt it = m_StreamArray.begin();
		it != m_StreamArray.end();
		++it)
	{
		if ( ErrorSev & (*it)->m_uiErrorSeverity )
			(*it)->m_pStream->write( message);
	}
}

// ----------------------------------------------------------------------------------
//	Returns thread id, if not supported only a zero will be returned.
unsigned int DefaultLogger::GetThreadID()
{
	// fixme: we can get this value via boost::threads
#ifdef WIN32
	return (unsigned int)::GetCurrentThreadId();
#else
	return 0; // not supported
#endif
}

// ----------------------------------------------------------------------------------

} // !namespace Assimp