maintenance/lag.php

   1 <?php
   2 /**
   3  * Shows database lag
   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 to show database lag.
  30  *
  31  * @ingroup Maintenance
  32  */
  33 class DatabaseLag extends Maintenance {
  34         public function __construct() {
  35                 parent::__construct();
  36                 $this->addDescription( 'Shows database lag' );
  37                 $this->addOption( 'r', "Don't exit immediately, but show the lag every 5 seconds" );
  38         }
  39
  40         public function execute() {
  41                 $lb = MediaWikiServices::getInstance()->getDBLoadBalancer();
  42                 if ( $this->hasOption( 'r' ) ) {
  43                         echo 'time     ';
  44
  45                         $serverCount = $lb->getServerCount();
  46                         for ( $i = 1; $i < $serverCount; $i++ ) {
  47                                 $hostname = $lb->getServerName( $i );
  48                                 printf( "%-12s ", $hostname );
  49                         }
  50                         echo "\n";
  51
  52                         while ( 1 ) {
  53                                 $lags = $lb->getLagTimes();
  54                                 unset( $lags[0] );
  55                                 echo gmdate( 'H:i:s' ) . ' ';
  56                                 foreach ( $lags as $lag ) {
  57                                         printf( "%-12s ", $lag === false ? 'false' : $lag );
  58                                 }
  59                                 echo "\n";
  60                                 sleep( 5 );
  61                         }
  62                 } else {
  63                         $lags = $lb->getLagTimes();
  64                         foreach ( $lags as $i => $lag ) {
  65                                 $name = $lb->getServerName( $i );
  66                                 $this->output( sprintf( "%-20s %s\n", $name, $lag === false ? 'false' : $lag ) );
  67                         }
  68                 }
  69         }
  70 }
  71
  72 $maintClass = DatabaseLag::class;
  73 require_once RUN_MAINTENANCE_IF_MAIN;