<?php
  
  /*
   * This file is part of the Monolog package.
   *
   * (c) Jordi Boggiano <j.boggiano@seld.be>
   *
   * For the full copyright and license information, please view the LICENSE
   * file that was distributed with this source code.
   */
  
  namespace Monolog\Handler;
  
  use Monolog\Logger;
  use Monolog\Formatter\LineFormatter;
  
  /**
   * Logs to syslog service.
   *
   * usage example:
   *
   *   $log = new Logger('application');
   *   $syslog = new SyslogHandler('myfacility', 'local6');
   *   $formatter = new LineFormatter("%channel%.%level_name%: %message% %extra%");
   *   $syslog->setFormatter($formatter);
   *   $log->pushHandler($syslog);
   *
   * @author Sven Paulus <sven@karlsruhe.org>
   */
  class SyslogHandler extends AbstractProcessingHandler
  {
      /**
       * Translates Monolog log levels to syslog log priorities.
       */
      private $logLevels = array(
          Logger::DEBUG     => LOG_DEBUG,
          Logger::INFO      => LOG_INFO,
          Logger::NOTICE    => LOG_NOTICE,
          Logger::WARNING   => LOG_WARNING,
          Logger::ERROR     => LOG_ERR,
          Logger::CRITICAL  => LOG_CRIT,
          Logger::ALERT     => LOG_ALERT,
          Logger::EMERGENCY => LOG_EMERG,
      );
  
      /**
       * List of valid log facility names.
       */
      private $facilities = array(
          'auth'     => LOG_AUTH,
          'authpriv' => LOG_AUTHPRIV,
          'cron'     => LOG_CRON,
          'daemon'   => LOG_DAEMON,
          'kern'     => LOG_KERN,
          'lpr'      => LOG_LPR,
          'mail'     => LOG_MAIL,
          'news'     => LOG_NEWS,
          'syslog'   => LOG_SYSLOG,
          'user'     => LOG_USER,
          'uucp'     => LOG_UUCP,
      );
  
      /**
       * @param string  $ident
       * @param mixed   $facility
       * @param integer $level    The minimum logging level at which this handler will be triggered
       * @param Boolean $bubble   Whether the messages that are handled can bubble up the stack or not
       * @param int     $logopts  Option flags for the openlog() call, defaults to LOG_PID
       */
      public function __construct($ident, $facility = LOG_USER, $level = Logger::DEBUG, $bubble = true, $logopts = LOG_PID)
      {
          parent::__construct($level, $bubble);
  
          if (!defined('PHP_WINDOWS_VERSION_BUILD')) {
              $this->facilities['local0'] = LOG_LOCAL0;
              $this->facilities['local1'] = LOG_LOCAL1;
              $this->facilities['local2'] = LOG_LOCAL2;
              $this->facilities['local3'] = LOG_LOCAL3;
              $this->facilities['local4'] = LOG_LOCAL4;
              $this->facilities['local5'] = LOG_LOCAL5;
              $this->facilities['local6'] = LOG_LOCAL6;
              $this->facilities['local7'] = LOG_LOCAL7;
          }
  
          // convert textual description of facility to syslog constant
          if (array_key_exists(strtolower($facility), $this->facilities)) {
              $facility = $this->facilities[strtolower($facility)];
          } elseif (!in_array($facility, array_values($this->facilities), true)) {
              throw new \UnexpectedValueException('Unknown facility value "'.$facility.'" given');
          }
  
          if (!openlog($ident, $logopts, $facility)) {
              throw new \LogicException('Can\'t open syslog for ident "'.$ident.'" and facility "'.$facility.'"');
          }
      }
  
      /**
       * {@inheritdoc}
       */
      public function close()
      {
          closelog();
      }
  
      /**
       * {@inheritdoc}
       */
      protected function write(array $record)
      {
          syslog($this->logLevels[$record['level']], (string) $record['formatted']);
      }
  
      /**
       * {@inheritdoc}
       */
      protected function getDefaultFormatter()
      {
          return new LineFormatter('%channel%.%level_name%: %message% %context% %extra%');
      }
  }