Clementine-audio-player-Mac-Linux-Windows/src/core/logging.cpp

/* This file is part of Clementine.
   Copyright 2010, David Sansome <me@davidsansome.com>

   Clementine 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.

   Clementine 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 Clementine.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <QCoreApplication>
#include <QDateTime>
#include <QStringList>

#include <glib.h>

#include "logging.h"


namespace logging {

static Level sDefaultLevel = Level_Debug;
static QMap<QString, Level>* sClassLevels = NULL;
static QIODevice* sNullDevice = NULL;

const char* kDefaultLogLevels = "GstEnginePipeline:2,*:3";

static const char* kMessageHandlerMagic = "__logging_message__";
static const int kMessageHandlerMagicLength = strlen(kMessageHandlerMagic);
static QtMsgHandler sOriginalMessageHandler = NULL;


static void GLog(const gchar* domain, GLogLevelFlags level,
                 const gchar* message, gpointer user_data) {
  switch (level) {
    case G_LOG_FLAG_RECURSION:
    case G_LOG_FLAG_FATAL:
    case G_LOG_LEVEL_ERROR:
    case G_LOG_LEVEL_CRITICAL: qLog(Error)   << message; break;
    case G_LOG_LEVEL_WARNING:  qLog(Warning) << message; break;
    case G_LOG_LEVEL_MESSAGE:
    case G_LOG_LEVEL_INFO:     qLog(Info)    << message; break;
    case G_LOG_LEVEL_DEBUG:
    default:                   qLog(Debug)   << message; break;
  }
}

static void MessageHandler(QtMsgType type, const char* message) {
  if (strncmp(kMessageHandlerMagic, message, kMessageHandlerMagicLength) == 0) {
    fprintf(stderr, "%s\n", message + kMessageHandlerMagicLength);
    return;
  }

  Level level = Level_Debug;
  switch (type) {
    case QtFatalMsg:
    case QtCriticalMsg: level = Level_Error;   break;
    case QtWarningMsg:  level = Level_Warning; break;
    case QtDebugMsg:
    default:            level = Level_Debug;   break;
  }

  foreach (const QString& line, QString::fromLocal8Bit(message).split('\n')) {
    CreateLogger(level, "unknown", -1) << line.toLocal8Bit().constData();
  }

  if (type == QtFatalMsg) {
    abort();
  }
}


void Init() {
  delete sClassLevels;
  delete sNullDevice;

  sClassLevels = new QMap<QString, Level>();
  sNullDevice = new NullDevice;

  // Glib integration
  g_log_set_default_handler(&GLog, NULL);

  // Catch other messages from Qt
  if (!sOriginalMessageHandler) {
    sOriginalMessageHandler = qInstallMsgHandler(MessageHandler);
  }
}

void SetLevels(const QString& levels) {
  if (!sClassLevels)
    return;

  foreach (const QString& item, levels.split(',')) {
    const QStringList class_level = item.split(':');

    QString class_name;
    bool ok = false;
    int level = Level_Error;

    if (class_level.count() == 1) {
      level = class_level.last().toInt(&ok);
    } else if (class_level.count() == 2) {
      class_name = class_level.first();
      level = class_level.last().toInt(&ok);
    }

    if (!ok || level < Level_Error || level > Level_Debug) {
      continue;
    }

    if (class_name.isEmpty() || class_name == "*") {
      sDefaultLevel = (Level) level;
    } else {
      sClassLevels->insert(class_name, (Level) level);
    }
  }
}

QDebug CreateLogger(Level level, const char* pretty_function, int line) {
  // Map the level to a string
  const char* level_name = NULL;
  switch (level) {
    case Level_Debug:   level_name = " DEBUG "; break;
    case Level_Info:    level_name = " INFO  "; break;
    case Level_Warning: level_name = " WARN  "; break;
    case Level_Error:   level_name = " ERROR "; break;
  }

  // Get the class name out of the function name.
  QString class_name = pretty_function;
  const int paren = class_name.indexOf('(');
  if (paren != -1) {
    const int colons = class_name.lastIndexOf("::", paren);
    if (colons != -1) {
      class_name = class_name.left(colons);
    } else {
      class_name = class_name.left(paren);
    }
  }

  const int space = class_name.lastIndexOf(' ');
  if (space != -1) {
    class_name = class_name.mid(space+1);
  }

  // Check the settings to see if we're meant to show or hide this message.
  Level threshold_level = sDefaultLevel;
  if (sClassLevels && sClassLevels->contains(class_name)) {
    threshold_level = sClassLevels->value(class_name);
  }

  if (level > threshold_level) {
    return QDebug(sNullDevice);
  }

  QString function_line = class_name;
  if (line != -1) {
    function_line += ":" + QString::number(line);
  }

  QDebug ret(QtDebugMsg);
  ret.nospace() << kMessageHandlerMagic
      << QDateTime::currentDateTime().toString("hh:mm:ss.zzz").toAscii().constData()
      << level_name << function_line.leftJustified(32).toAscii().constData();

  return ret.space();
}

} // namespace logging