<?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\Formatter\SimpleFormatter;

use Monolog\Logger;

/**

 * 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::WARNING  => LOG_WARNING,

        Logger::ERROR    => LOG_ERR,

        Logger::CRITICAL => LOG_CRIT,

        Logger::ALERT    => LOG_ALERT,

    );

    /**

     * 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

     */

    public function __construct($ident, $facility = LOG_USER, $level = Logger::DEBUG, $bubble = true)

    {

        parent::__construct($level, $bubble);

        if (false === strpos(PHP_OS, 'WIN')) {

            $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)];

        } else if (!in_array($facility, array_values($this->facilities), true)) {

            throw new \UnexpectedValueException('Unknown facility value "'.$facility.'" given');

        }

        if (!openlog($ident, LOG_PID, $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']);

    }

}