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Open Asset Import Library (assimp)

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/** @file  DefaultLogger.cpp

 *  @brief Implementation of DefaultLogger (and Logger)

 */

// Default log streams

#include "FileLogStream.h"

#include "StdOStreamLogStream.h"

#include "Win32DebugLogStream.h"

#include <assimp/StringUtils.h>

#include <assimp/DefaultIOSystem.h>

#include <assimp/ai_assert.h>

#include <stdio.h>

#include <assimp/DefaultLogger.hpp>

#include <assimp/NullLogger.hpp>

#include <iostream>

#ifndef ASSIMP_BUILD_SINGLETHREADED

#include <mutex>

#include <thread>

std::mutex loggerMutex;

#endif

namespace Assimp {

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

NullLogger DefaultLogger::s_pNullLogger;

Logger *DefaultLogger::m_pLogger = &DefaultLogger::s_pNullLogger;

static const unsigned int SeverityAll = Logger::Info | Logger::Err | Logger::Warn | Logger::Debugging;

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

// Represents a log-stream + 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() {

        delete m_pStream;

    }

};

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

// Construct a default log stream

LogStream *LogStream::createDefaultStream(aiDefaultLogStream streams,

        const char *name /*= "AssimpLog.txt"*/,

        IOSystem *io /*= nullptr*/) {

    switch (streams) {

        // This is a platform-specific feature

    case aiDefaultLogStream_DEBUGGER:

#ifdef WIN32

        return new Win32DebugLogStream();

#else

        return nullptr;

#endif

    // Platform-independent default streams

    case aiDefaultLogStream_STDERR:

        return new StdOStreamLogStream(std::cerr);

    case aiDefaultLogStream_STDOUT:

        return new StdOStreamLogStream(std::cout);

    case aiDefaultLogStream_FILE:

        return (name && *name ? new FileLogStream(name, io) : nullptr);

    default:

        // We don't know this default log stream, so raise an assertion

        ai_assert(false);

    };

    // For compilers without dead code path detection

    return nullptr;

}

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

//  Creates the only singleton instance

Logger *DefaultLogger::create(const char *name /*= "AssimpLog.txt"*/,

        LogSeverity severity /*= NORMAL*/,

        unsigned int defStreams /*= aiDefaultLogStream_DEBUGGER | aiDefaultLogStream_FILE*/,

        IOSystem *io /*= nullptr*/) {

    // enter the mutex here to avoid concurrency problems

#ifndef ASSIMP_BUILD_SINGLETHREADED

    std::lock_guard<std::mutex> 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 & aiDefaultLogStream_DEBUGGER) {

        m_pLogger->attachStream(LogStream::createDefaultStream(aiDefaultLogStream_DEBUGGER));

    }

    // Stream the log to COUT?

    if (defStreams & aiDefaultLogStream_STDOUT) {

        m_pLogger->attachStream(LogStream::createDefaultStream(aiDefaultLogStream_STDOUT));

    }

    // Stream the log to CERR?

    if (defStreams & aiDefaultLogStream_STDERR) {

        m_pLogger->attachStream(LogStream::createDefaultStream(aiDefaultLogStream_STDERR));

    }

    // Stream the log to a file

    if (defStreams & aiDefaultLogStream_FILE && name && *name) {

        m_pLogger->attachStream(LogStream::createDefaultStream(aiDefaultLogStream_FILE, name, io));

    }

    return m_pLogger;

}

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

void Logger::debug(const char *message) {

    // SECURITY FIX: otherwise it's easy to produce overruns since

    // sometimes importers will include data from the input file

    // (i.e. node names) in their messages.

    if (strlen(message) > MAX_LOG_MESSAGE_LENGTH) {

        return OnDebug("<fixme: long message discarded>");

    }

    return OnDebug(message);

}

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

void Logger::verboseDebug(const char *message) {

    // SECURITY FIX: see above

    if (strlen(message) > MAX_LOG_MESSAGE_LENGTH) {

        return OnVerboseDebug("<fixme: long message discarded>");

    }

    return OnVerboseDebug(message);

}

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

void Logger::info(const char *message) {

    // SECURITY FIX: see above

    if (strlen(message) > MAX_LOG_MESSAGE_LENGTH) {

        return OnInfo("<fixme: long message discarded>");

    }

    return OnInfo(message);

}

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

void Logger::warn(const char *message) {

    // SECURITY FIX: see above

    if (strlen(message) > MAX_LOG_MESSAGE_LENGTH) {

        return OnWarn("<fixme: long message discarded>");

    }

    return OnWarn(message);

}

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

void Logger::error(const char *message) {

    // SECURITY FIX: see above

    if (strlen(message) > MAX_LOG_MESSAGE_LENGTH) {

        return OnError("<fixme: long message discarded>");

    }

    return OnError(message);

}

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

void DefaultLogger::set(Logger *logger) {

    // enter the mutex here to avoid concurrency problems

#ifndef ASSIMP_BUILD_SINGLETHREADED

    std::lock_guard<std::mutex> lock(loggerMutex);

#endif

    if (nullptr == logger) {

        m_pLogger = &s_pNullLogger;

    }

    else {

        m_pLogger = logger;

    }

}

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

bool DefaultLogger::isNullLogger() {

    return m_pLogger == &s_pNullLogger;

}

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

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

    std::lock_guard<std::mutex> 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::DEBUGGING) {

        return;

    }

    static const size_t Size = MAX_LOG_MESSAGE_LENGTH + 16;

    char msg[Size];

    ai_snprintf(msg, Size, "Debug, T%u: %s", GetThreadID(), message);

    WriteToStreams(msg, Logger::Debugging);

}

//  Verbose debug message

void DefaultLogger::OnVerboseDebug(const char *message) {

    if (m_Severity < Logger::VERBOSE) {

        return;

    }

    static const size_t Size = MAX_LOG_MESSAGE_LENGTH + 16;

    char msg[Size];

    ai_snprintf(msg, Size, "Debug, T%u: %s", GetThreadID(), message);

    WriteToStreams(msg, Logger::Debugging);

}

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

//  Logs an info

void DefaultLogger::OnInfo(const char *message) {

    static const size_t Size = MAX_LOG_MESSAGE_LENGTH + 16;

    char msg[Size];

    ai_snprintf(msg, Size, "Info,  T%u: %s", GetThreadID(), message);

    WriteToStreams(msg, Logger::Info);

}

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

//  Logs a warning

void DefaultLogger::OnWarn(const char *message) {

    static const size_t Size = MAX_LOG_MESSAGE_LENGTH + 16;

    char msg[Size];

    ai_snprintf(msg, Size, "Warn,  T%u: %s", GetThreadID(), message);

    WriteToStreams(msg, Logger::Warn);

}

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

//  Logs an error

void DefaultLogger::OnError(const char *message) {

    static const size_t Size = MAX_LOG_MESSAGE_LENGTH + 16;

    char msg[Size];

    ai_snprintf(msg, Size, "Error, T%u: %s", GetThreadID(), message);

    WriteToStreams(msg, Logger::Err);

}

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

//  Will attach a new stream

bool DefaultLogger::attachStream(LogStream *pStream, unsigned int severity) {

    if (nullptr == pStream) {

        return false;

    }

    if (0 == severity) {

        severity = SeverityAll;

    }

#ifndef ASSIMP_BUILD_SINGLETHREADED

    std::lock_guard<std::mutex> lock(m_arrayMutex);

#endif

    for (StreamIt it = m_StreamArray.begin();

            it != m_StreamArray.end();

            ++it) {

        if ((*it)->m_pStream == pStream) {

            (*it)->m_uiErrorSeverity |= severity;

            return true;

        }

    }

    m_StreamArray.push_back(new LogStreamInfo(severity, pStream));

    return true;

}

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

//  Detach a stream

bool DefaultLogger::detachStream(LogStream *pStream, unsigned int severity) {

    if (nullptr == pStream) {

        return false;

    }

    if (0 == severity) {

        severity = SeverityAll;

    }

#ifndef ASSIMP_BUILD_SINGLETHREADED

    std::lock_guard<std::mutex> lock(m_arrayMutex);

#endif

    bool res(false);

    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) {

                // don't delete the underlying stream 'cause the caller gains ownership again

                (**it).m_pStream = nullptr;

                delete *it;

                m_StreamArray.erase(it);

                res = true;

                break;

            }

            return true;

        }

    }

    return res;

}

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

//  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) {

        // also frees the underlying stream, we are its owner.

        delete *it;

    }

}

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

//  Writes message to stream

void DefaultLogger::WriteToStreams(const char *message, ErrorSeverity ErrorSev) {

    ai_assert(nullptr != message);

#ifndef ASSIMP_BUILD_SINGLETHREADED

    std::lock_guard<std::mutex> lock(m_arrayMutex);

#endif

    // Check whether this is a repeated message

    auto thisLen = ::strlen(message);

    if (thisLen == lastLen - 1 && !::strncmp(message, lastMsg, lastLen - 1)) {

        if (!noRepeatMsg) {

            noRepeatMsg = true;

            message = "Skipping one or more lines with the same contents\n";

        }

        return;

    } else {

        // append a new-line character to the message to be printed

        lastLen = thisLen;

        ::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 std::threads

    // std::this_thread::get_id().hash() returns a (big) size_t, not sure if this is useful in this case.

#ifdef WIN32

    return (unsigned int)::GetCurrentThreadId();

#else

    return 0; // not supported

#endif

}

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

} // namespace Assimp