logger.hh

/*
    PowerMail versatile mail receiver
    Copyright (C) 2002  PowerDNS.COM BV

    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.

    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; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/
#ifndef LOGGER_HH
#define LOGGER_HH
#include <string>
#include <map>
#include <ctime>
#include <iostream>
#include <sstream>
#include <pthread.h>

#include <syslog.h>

using namespace std;

//! The Logger class can be used to log messages in various ways.
class Logger
{
public:
  Logger(const string &, int facility=LOG_DAEMON); //!< pass the identification you wish to appear in the log

  //! The urgency of a log message
  enum Urgency {All=99999,Alert=LOG_ALERT, Critical=LOG_CRIT, Error=LOG_ERR, Warning=LOG_WARNING,
		Notice=LOG_NOTICE,Info=LOG_INFO, Debug=LOG_DEBUG, None=-1};

  /** Log a message. 
      \param msg Message you wish to log 
      \param Urgency Urgency of the message you wish to log
  */
  void log(const string &msg, Urgency u=Notice); 

  void setFacility(int f){d_facility=f;open();} //!< Choose logging facility
  void setName(const string &n); //!< Change the name we log under
  void setFlag(int f){flags|=f;open();} //!< set a syslog flag
  //! determine of messages go only to syslog, or appear on the screen as well
  void toConsole(bool b);

  //! set lower limit of urgency needed for console display. Messages of this urgency, and higher, will be displayed
  void toConsole(Urgency);

  void resetFlags(){flags=0;open();} //!< zero the flags
  /** Use this to stream to your log, like this:
      \code
      L<<"This is an informational message"<<endl; // logged at default loglevel (Info)
      L<<Logger::Warning<<"Out of diskspace"<<endl; // Logged as a warning 
      L<<"This is an informational message"<<endl; // logged AGAIN at default loglevel (Info)
      \endcode
  */
  Logger& operator<<(const string &s);   //!< log a string
  Logger& operator<<(int);   //!< log an int
  Logger& operator<<(Urgency);    //!< set the urgency, << style
  Logger& operator<<(ostream & (&)(ostream &)); //!< this is to recognise the endl, and to commit the log
private:
  Logger& operator=(const Logger &);
  Logger(const Logger &);

  map<pthread_t,string>d_strings;
  map<pthread_t,Urgency> d_outputurgencies;
  void open();
  string name;
  int flags;
  int d_facility;
  bool opened;
  Urgency consoleUrgency;
  pthread_mutex_t lock;
};

#ifdef VERBOSELOG
#define DLOG(x) x
#else
#define DLOG(x)
#endif


#endif