Log Library for Codeigniter

gistfile1.php

<?php defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * CodeIgniter Log Library
 *
 * @category   Applications
 * @package    CodeIgniter
 * @subpackage Libraries
 * @author     hjue 
 * @license    BSD License
 * @link       http://hjue.me
 * @since      Version 1.0
 */
/*
drop table logs;
CREATE TABLE IF NOT EXISTS `logs` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `err_no` int(2) NOT NULL,
  `err_type` varchar(32) CHARACTER SET utf8 NOT NULL,
  `err_message` text CHARACTER SET utf8 NOT NULL,
  `err_file` varchar(255) CHARACTER SET utf8 NOT NULL,
  `err_line` int(4) NOT NULL,
  `time` datetime NOT NULL,
  PRIMARY KEY (`id`)
)  DEFAULT CHARSET=utf8;
*/


class Log_lib {
	
	private $_ci;
  private $_sentry_client;
  private $_log_table_name;
  
  public $log_levels = array(
      E_ERROR             => 'Error',
      E_WARNING           => 'Warning',
      E_PARSE             => 'Parsing Error',
      E_NOTICE            => 'Notice',
      E_CORE_ERROR        => 'Core Error',
      E_CORE_WARNING      => 'Core Warning',
      E_COMPILE_ERROR     => 'Compile Error',
      E_COMPILE_WARNING   => 'Compile Warning',
      E_USER_ERROR        => 'User Error',
      E_USER_WARNING      => 'User Warning',
      E_USER_NOTICE       => 'User Notice',
      E_STRICT            => 'Runtime Notice',
      E_RECOVERABLE_ERROR => 'Catchable error',
      E_DEPRECATED        => 'Runtime Notice',
      E_USER_DEPRECATED   => 'User Warning'
  );
  
  public function __construct()
  {

      $this->_ci =& get_instance();
      set_error_handler(array($this, 'log_error'));
      set_exception_handler(array($this, 'log_exception'));      
      register_shutdown_function(array($this,'shutdown_function'));

      if ($this->_ci->config->item('default_log') == 'sentry' and $this->_ci->config->item('raven_dsn')) 
      {
          include APPPATH.'third_party/Raven/Autoloader.php';
          Raven_Autoloader::register();          
          $this->_sentry_client = new Raven_Client($this->_ci->config->item('raven_dsn'));
          $this->set_user_data();  

      }
      
      if($this->_ci->config->item('default_log') == 'database'  and $this->_ci->config->item('log_table_name'))
      {
        $this->_ci->load->database();
        $this->_log_table_name = $this->_ci->config->item('log_table_name');
      }
  }  	
  
  function shutdown_function() {
   if (($error = error_get_last()) and $error['type']==E_ERROR) {
     $this->log_exception($error['type'],$error['message'],$error['file'],$error['line']);
    }
  }

  private function set_user_data()
  {
  	$this->_ci->load->library('user_lib');
  	$username = $this->_ci->user_lib->getCurrUserName();
  	if(!empty($username)){
  		$this->_sentry_client->set_user_data($username);
  	}
  }
  
  function log_exception($exception)
  {   
    $error_type = $exception->getCode();

// TODO catch Exception->getCode==0 ,why
//    if ($error_type==0) $error_type = 1;    

    $this->log_error($error_type,$exception->getMessage(),$exception->getFile(),$exception->getLine());
  }
      
  function log_error($severity, $message, $filepath, $line)
  {
      if (isset($this->log_levels[$severity]))
      {
          if ($this->_sentry_client)
          {
          	$level 		= $this->_sentry_client->translateSeverity($severity);
          	$referer 	= empty($_SERVER['HTTP_REFERER'])?'':$_SERVER['HTTP_REFERER'];
          	
          	$options = array(
          			'level'=>$level,
          			'tags'=>array('referer'=>$referer),
          			);
          	
            $this->_sentry_client->captureException(new Exception($message),$options); 
                       
          }else if($this->_log_table_name)
          {
            $data = array(
                  'err_no' => $severity,
                  'err_type' => isset($this->log_levels[$severity]) ? $this->log_levels[$severity] : $severity,
                  'err_message' => $message,
                  'err_file' => $filepath,
                  'err_line' => $line,
                  'time' => date('Y-m-d H:i:s')
              );

              $this->_ci->db->insert($this->_log_table_name, $data);            
          }
          
      }
  }
}