logger.h

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/************************************************************
 * Threads Library Extras
 * ----------------------
 *
 * Logger Class - this class will help on logging messages
 * 
 * Last Update: Oct 15th 2001
 *
 * Author: Cass Surek <[e-mail]> 
 *         and 
 *         Orn E. Hansen <[e-mail]>  
 *
 ************************************************************/

#include <thread.h>
#include "exception.h"
#include "linked_list.h"

extern "C" {

#include <syslog.h>
#include <unistd.h>
#include <stdarg.h>

};


using namespace cpp_threads;

/**
 * The Logger class provides an easy way to log messages from inside your application.
 * <BR>At startup, it starts a new thread which does not block the main execution thread.
 * <BR>It currently uses syslog to log messages.
 * <BR>Here's an example of its use:
 <BR><BR>int main()
<BR>{
<BR>
<BR>    Logger *log;
<BR>
<BR>   Creating Log facility
<BR>    log = new Logger(3);
<BR>    log->run();
<BR>
<BR>    //lots of code here
<BR>    
<BR>    log->write(4,"integer: \%d",(void*)10);
<BR>    
<BR>    //lots of code here too
<BR>
<BR>    // Stopping the Logger
<BR>    log->stop();
<BR>
<BR>    return 1;
<BR>}

 */


class LoggerMsg : public Node {

 private:
    
    Logger::llevel _level;
    std::string _message;

 public:
 
    /**
     * If no log level is informed, it will assum an "info" message.
     * @param level The log level that this message should have 
     */
     LoggerMsg(Logger::llevel level=info, const std::string message="")
     {
        _level = level;
	_message = message;
     }
     
    /**
     * Sets the log level of this message
     * @param level The log level that this message should have 
     */
     void setLevel(Logger::llevel level)
     {
        _level = level;
     }
     
    /**
     * Sets the message
     * @param message What should be logged
     */
     void setMessage(const std::string message&)
     {
        _message = message;
     }

    /**
     * Gets the log level of this message
     * @return The log level of this message
     */
     Logger::llevel level getLevel()
     {
        return level;
     }
     
    /**
     * Gets the message
     * @return The text of this message
     */
     std::string message& getMessage()
     {
        return std::string message&;
     }

};

class Logger : public pthread {

 private:
    int debug_level;
    
       

    public:
    /**
     * Options supported by the linux kernel
     */
	enum loptions {
	    cons 	= LOG_CONS,
	    ndelay 	= LOG_NDELAY,
	    perror 	= LOG_PERROR,
	    pid 	= LOG_PID
	}
	
    /**
     * Facilities supported by the linux kernel
     */
	enum lfacility {
	    authpriv 	= LOG_AUTHPRIV,
	    cron 	= LOG_CRON,
	    daemon 	= LOG_DAEMON,
	    kern 	= LOG_KERNEL,
	    local0 	= LOG_LOCAL0,
	    local1 	= LOG_LOCAL1,
	    local2 	= LOG_LOCAL2,
	    local3 	= LOG_LOCAL3,
	    local4 	= LOG_LOCAL4,
	    local5 	= LOG_LOCAL5,
	    local6 	= LOG_LOCAL6,
	    local7 	= LOG_LOCAL7,
	    lpr 	= LOG_LPR,
	    mail 	= LOG_MAIL,
	    news 	= LOG_NEWS,
	    user 	= LOG_USER,
	}
	
	
    /**
     * Levels supported by the linux kernel
     */
	enum llevel {
    	    emerg 	= LOG_EMERG,
	    alert 	= LOG_ALERT,
	    crit 	= LOG_CRIT,
	    err 	= LOG_ERR,
	    warn 	= LOG_WARNING,
	    info 	= LOG_INFO,
	    debug 	= LOG_DEBUG
	}
	
    /**
     * Here you must inform the debug level that should be logged.
     * If none is informed, all messages up to warning messages are going to be logged.
       @param debug_level The maximum debug level
     */
	Logger(int debug_level=LOG_WARN)
	 {
	   this->debug_level = debug_level;
	 }
	 
	 
    /**
     * Use this method to write the message to the log
       \param level The debug level of this message
       \param msg The message to be written
       \param arg* Arguments to the syslog function in a printf style
     */
	 void write(int level, char *msg, void *arg1=0, void *arg2=0, void *arg3=0)
	 {
	    if(level>=debug_level)
		syslog(LOG_INFO,msg,arg1,arg2,arg3);
	 }
	 
	int thread(void *)
	{
	  return 0;
        }

	/* Operators */
	
    /**
     * Use this method to log something with INFO level.
       @param std::string& Message
     */
	Logger& Logger::operator <<(const std::string&)
	{
	    syslog(LOG_INFO,msg.c_str());
	}


	/* Syslog Logging */
	
	/**
        *   This method will open a connection to the system logger.
	    @param ident The ident is added to each message (typically the program name)
        */
	void OpenLog(const std::string ident&, Logger::loption opt, Logger::facility fac)
	{
	    openlog(ident.c_str(), opt, fac);
	}		

	/**
        *   This method will close the descriptor used to write to the system logger
        */
	void CloseLog()
	{
	    closelog(void);
	}		

	/* Shortcuts */
	
	/**
        *   This method is a shortcut to log an emergency message
        *   @param msg The message to be logged
	*/
	void Emergency(const std::string& msg)
	{
	    syslog(LOG_EMERG,msg.c_str());
	}
		
	/**
        *   This method is a shortcut to log an alert message
        *   @param msg The message to be logged
	*/
	void Alert(const std::string& msg)
	{
	    syslog(LOG_ALERT,msg.c_str());
	}
	
	/**
        *   This method is a shortcut to log a crit message
        *   @param msg The message to be logged
	*/
	void Critical(const std::string& msg)
	{
	    syslog(LOG_CRIT,msg.c_str());
	}
	
	/**
        *   This method is a shortcut to log an error message
        *   @param msg The message to be logged
	*/
	void Error(const std::string& msg)
	{
	    syslog(LOG_INFO,msg.c_str());
	}		

	/**
        *   This method is a shortcut to log a warning message
        *   @param msg The message to be logged
	*/
	void Warning(const std::string& msg)
	{
	    syslog(LOG_WARN,msg.c_str());
	}		

	/**
        *   This method is a shortcut to log a notice message
        *   @param msg The message to be logged
	*/
	void Notice(const std::string& msg)
	{
	    syslog(LOG_NOTICE,msg.c_str());
	}		

	/**
        *   This method is a shortcut to log an info message
        *   @param msg The message to be logged
	*/
	void Info(const std::string& msg)
	{
	    syslog(LOG_INFO,msg.c_str());
	}
	
	/**
        *   This method is a shortcut to log a debug message
        *   @param msg The message to be logged
	*/
	void Debug(const std::string& msg)
	{
	    syslog(LOG_DEBUG,msg.c_str());
	}

	/**
        *   This method will log an exception
        */
	void LogException(cpp_threads::exception::tType severity, int err_num, const std::string msg&)
	{
	    syslog(LOG_ERR, "ERROR: %d",err_num);
	    syslog(LOG_ERR,msg.c_str());
	}


	/* Kernel logging */

	/**
        *   This method will open the log through the kernel system call interface.
    	    <BR>This will only work for a root process.
	    @param msg The msg to be sent when opening the syslog
	    @return true if successful, false if unsuccessful
        */
/*	bool kOpenLog(char *msg)
	{
	    if(syslog(1,msg,0)!=-1)
		return true;
	     
	}
 */ 
  };