maintenance/getLagTimes.php

   1 <?php
   2 /**
   3  * Display replication lag times.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Maintenance
  22  */
  23
  24 require_once __DIR__ . '/Maintenance.php';
  25
  26 use MediaWiki\MediaWikiServices;
  27
  28 /**
  29  * Maintenance script that displays replication lag times.
  30  *
  31  * @ingroup Maintenance
  32  */
  33 class GetLagTimes extends Maintenance {
  34         public function __construct() {
  35                 parent::__construct();
  36                 $this->addDescription( 'Dump replication lag times' );
  37                 $this->addOption( 'report', "Report the lag values to StatsD" );
  38         }
  39
  40         public function execute() {
  41                 $services = MediaWikiServices::getInstance();
  42                 $lbFactory = $services->getDBLoadBalancerFactory();
  43                 $stats = $services->getStatsdDataFactory();
  44                 $lbsByType = [
  45                         'main' => $lbFactory->getAllMainLBs(),
  46                         'external' => $lbFactory->getAllExternalLBs()
  47                 ];
  48
  49                 foreach ( $lbsByType as $type => $lbs ) {
  50                         foreach ( $lbs as $cluster => $lb ) {
  51                                 if ( $lb->getServerCount() <= 1 ) {
  52                                         continue;
  53                                 }
  54                                 $lags = $lb->getLagTimes();
  55                                 foreach ( $lags as $serverIndex => $lag ) {
  56                                         $host = $lb->getServerName( $serverIndex );
  57                                         if ( IP::isValid( $host ) ) {
  58                                                 $ip = $host;
  59                                                 $host = gethostbyaddr( $host );
  60                                         } else {
  61                                                 $ip = gethostbyname( $host );
  62                                         }
  63
  64                                         $starLen = min( intval( $lag ), 40 );
  65                                         $stars = str_repeat( '*', $starLen );
  66                                         $this->output( sprintf( "%10s %20s %3d %s\n", $ip, $host, $lag, $stars ) );
  67
  68                                         if ( $this->hasOption( 'report' ) ) {
  69                                                 $group = ( $type === 'external' ) ? 'external' : $cluster;
  70                                                 $stats->gauge( "loadbalancer.lag.$group.$host", intval( $lag * 1e3 ) );
  71                                         }
  72                                 }
  73                         }
  74                 }
  75         }
  76 }
  77
  78 $maintClass = "GetLagTimes";
  79 require_once RUN_MAINTENANCE_IF_MAIN;