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/*
* Logger.h - a global clas for easily logging messages to log files
*
* Copyright (c) 2010-2021 Tobias Junghans <tobydox@veyon.io>
*
* This file is part of Veyon - https://veyon.io
*
* 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 2 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 (see COPYING); if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
*/
#pragma once
#include <QMutex>
#include <QTextStream>
#include "VeyonCore.h"
class QFile;
// clazy:excludeall=rule-of-three
class VEYON_CORE_EXPORT Logger
{
Q_GADGET
public:
enum class LogLevel
{
Nothing,
Critical,
Error,
Warning,
Info,
Debug,
NumLogLevels,
Min = Nothing+1,
Max = NumLogLevels-1,
Default = Warning
};
Q_ENUM(LogLevel)
static constexpr int DefaultFileSizeLimit = 100;
static constexpr int DefaultFileRotationCount = 10;
static constexpr int MaximumMessageSize = 1000;
static constexpr const char* DefaultLogFileDirectory = "$TEMP";
explicit Logger( const QString &appName );
~Logger();
static const char* logLevelEnvironmentVariable()
{
return "VEYON_LOG_LEVEL";
}
LogLevel logLevel() const
{
return m_logLevel;
}
private:
void initLogFile();
void openLogFile();
void closeLogFile();
void clearLogFile();
void rotateLogFile();
void log( LogLevel logLevel, const QString& message );
void outputMessage( const QString& message );
static QString formatMessage( LogLevel ll, const QString &msg );
static void qtMsgHandler( QtMsgType msgType, const QMessageLogContext &, const QString& msg );
static QAtomicPointer<Logger> s_instance;
static QMutex s_instanceMutex;
LogLevel m_logLevel;
QMutex m_logMutex;
LogLevel m_lastMessageLevel;
QString m_lastMessage;
int m_lastMessageCount;
bool m_logToSystem;
QString m_appName;
QFile *m_logFile;
int m_logFileSizeLimit;
int m_logFileRotationCount;
} ;
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