includes/debug/logger/monolog/SyslogHandler.php

   1 <?php
   2 /**
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License as published by
   5  * the Free Software Foundation; either version 2 of the License, or
   6  * (at your option) any later version.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  16  * http://www.gnu.org/copyleft/gpl.html
  17  *
  18  * @file
  19  */
  20
  21 namespace MediaWiki\Logger\Monolog;
  22
  23 use Monolog\Handler\SyslogUdpHandler;
  24 use Monolog\Logger;
  25
  26 /**
  27  * Log handler that supports sending log events to a syslog server using RFC
  28  * 3164 formatted UDP packets.
  29  *
  30  * Monolog's SyslogUdpHandler creates a partial RFC 5424 header (PRI and
  31  * VERSION) and relies on the associated formatter to complete the header and
  32  * message payload. This makes using it with a fixed format formatter like
  33  * \Monolog\Formatter\LogstashFormatter impossible. Additionally, the
  34  * direct syslog input for Logstash only handles RFC 3164 syslog packets.
  35  *
  36  * This Handler should work with any Formatter. The formatted message will be
  37  * prepended with an RFC 3164 message header and a partial message body. The
  38  * resulting packet will looks something like:
  39  *
  40  *   <PRI>DATETIME HOSTNAME PROGRAM: MESSAGE
  41  *
  42  * This format works as input to rsyslog and can also be processed by the
  43  * default Logstash syslog input handler.
  44  *
  45  * @since 1.25
  46  * @author Bryan Davis <bd808@wikimedia.org>
  47  * @copyright © 2015 Bryan Davis and Wikimedia Foundation.
  48  */
  49 class SyslogHandler extends SyslogUdpHandler {
  50
  51         /**
  52          * @var string $appname
  53          */
  54         private $appname;
  55
  56         /**
  57          * @var string $hostname
  58          */
  59         private $hostname;
  60
  61         /**
  62          * @param string $appname Application name to report to syslog
  63          * @param string $host Syslog host
  64          * @param int $port Syslog port
  65          * @param int $facility Syslog message facility
  66          * @param string $level The minimum logging level at which this handler
  67          *   will be triggered
  68          * @param bool $bubble Whether the messages that are handled can bubble up
  69          *   the stack or not
  70          */
  71         public function __construct(
  72                 $appname,
  73                 $host,
  74                 $port = 514,
  75                 $facility = LOG_USER,
  76                 $level = Logger::DEBUG,
  77                 $bubble = true
  78         ) {
  79                 parent::__construct( $host, $port, $facility, $level, $bubble );
  80                 $this->appname = $appname;
  81                 $this->hostname = php_uname( 'n' );
  82         }
  83
  84         protected function makeCommonSyslogHeader( $severity ) {
  85                 $pri = $severity + $this->facility;
  86
  87                 // Goofy date format courtesy of RFC 3164 :(
  88                 // RFC 3164 actually specifies that the day of month should be space
  89                 // padded rather than unpadded but this seems to work with rsyslog and
  90                 // Logstash.
  91                 $timestamp = date( 'M j H:i:s' );
  92
  93                 return "<{$pri}>{$timestamp} {$this->hostname} {$this->appname}: ";
  94         }
  95 }