ibrcommon/ibrcommon/Logger.h

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/*
 * Logger.h
 *
 * Copyright 2011 Johannes Morgenroth, IBR, TU Braunschweig
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef LOGGER_H_
#define LOGGER_H_

//#define __IBRCOMMON_MULTITHREADED__

#include <ibrcommon/thread/Queue.h>
#include <ibrcommon/thread/Thread.h>
#include <sys/time.h>
#include <iostream>
#include <sstream>
#include <list>

#define IBRCOMMON_LOGGER_LEVEL \
        ibrcommon::Logger::getVerbosity()

#define IBRCOMMON_LOGGER(level) \
        { \
                ibrcommon::Logger log = ibrcommon::Logger::level(); \
                log

#define IBRCOMMON_LOGGER_DEBUG(verbosity) \
        if (ibrcommon::Logger::getVerbosity() >= verbosity) \
        { \
                ibrcommon::Logger log = ibrcommon::Logger::debug(verbosity); \
                log

#define IBRCOMMON_LOGGER_ENDL \
                std::flush; \
                log.print(); \
        }

#define IBRCOMMON_LOGGER_ex(level) \
        IBRCOMMON_LOGGER(level) << __PRETTY_FUNCTION__ << ": "

#define IBRCOMMON_LOGGER_DEBUG_ex(verbosity) \
        IBRCOMMON_LOGGER_DEBUG(verbosity) << __FILE__ << ":" << __LINE__ << " in " << __PRETTY_FUNCTION__ << ": "

namespace ibrcommon
{
        class Logger : public std::stringstream
        {
        public:
                enum LogOptions
                {
                        LOG_NONE =              0,
                        LOG_DATETIME =  1 << 0, /* print date/time on log messages */
                        LOG_HOSTNAME =  1 << 1, /* print hostname on log messages */
                        LOG_LEVEL =             1 << 2, /* print the log level on log messages */
                        LOG_TIMESTAMP = 1 << 3  /* print timestamp on log messages */
                };

                enum LogLevel
                {
                        LOGGER_EMERG =          1 << 0, /* system is unusable */
                        LOGGER_ALERT =          1 << 1, /* action must be taken immediately */
                        LOGGER_CRIT =           1 << 2, /* critical conditions */
                        LOGGER_ERR =            1 << 3, /* error conditions */
                        LOGGER_WARNING =        1 << 4, /* warning conditions */
                        LOGGER_NOTICE =         1 << 5, /* normal but significant condition */
                        LOGGER_INFO =           1 << 6, /* informational */
                        LOGGER_DEBUG =          1 << 7, /* debug-level messages */
                        LOGGER_ALL =            0xff
                };

                Logger(const Logger&);
                virtual ~Logger();

                static Logger emergency();
                static Logger alert();
                static Logger critical();
                static Logger error();
                static Logger warning();
                static Logger notice();
                static Logger info();
                static Logger debug(int verbosity);

                static void setVerbosity(const int verbosity);

                static int getVerbosity();

                static void addStream(std::ostream &stream, const unsigned char logmask = LOGGER_INFO, const unsigned char options = LOG_NONE);

                static void enableSyslog(const char *name, int option, int facility, const unsigned char logmask = LOGGER_INFO);

                static void enableAsync();

                static void stop();

                void print();
                
        private:
                Logger(LogLevel level, int debug_verbosity = 0);

                class LoggerOutput
                {
                public:
                        LoggerOutput(std::ostream &stream, const unsigned char logmask, const unsigned char options);
                        virtual ~LoggerOutput();

                        void log(const Logger &log);

                        std::ostream &_stream;
                        unsigned char _level;
                        unsigned char _options;
                };
                
                class LogWriter : public ibrcommon::JoinableThread
                {
                public:
                        LogWriter();
                        virtual ~LogWriter();

                        void log(Logger &logger);

                        void setVerbosity(const int verbosity);

                        int getVerbosity();

                        void addStream(std::ostream &stream, const unsigned char logmask = LOGGER_INFO, const unsigned char options = LOG_NONE);

                        void enableSyslog(const char *name, int option, int facility, const unsigned char logmask = LOGGER_INFO);

                        void enableAsync();

                protected:
                        void flush();
                        void run();
                        bool __cancellation();

                private:
                        void flush(const Logger &logger);

                        int _verbosity;
                        bool _syslog;
                        unsigned char _syslog_mask;

                        ibrcommon::Queue<Logger> _queue;
                        bool _use_queue;
                        std::list<LoggerOutput> _logger;
                };

                LogLevel _level;
                int _debug_verbosity;
                struct timeval _logtime;

                static LogWriter _logwriter;
        };
}

#endif /* LOGGER_H_ */