lag.php

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<?php
use MediaWiki\Maintenance\Maintenance;
 
// @codeCoverageIgnoreStart
require_once __DIR__ . '/Maintenance.php';
// @codeCoverageIgnoreEnd
 
class DatabaseLag extends Maintenance {
 
    protected $stopReporting = false;
 
    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Shows database lag' );
        $this->addOption( 'r', "Don't exit immediately, but show the lag every 5 seconds" );
    }
 
    public function execute() {
        $lb = $this->getServiceContainer()->getDBLoadBalancer();
        if ( $this->hasOption( 'r' ) ) {
            $this->output( 'time     ' );
 
            $serverCount = $lb->getServerCount();
            for ( $i = 1; $i < $serverCount; $i++ ) {
                $hostname = $lb->getServerName( $i );
                $this->output( sprintf( "%-12s ", $hostname ) );
            }
            $this->output( "\n" );
 
            do {
                $lags = $lb->getLagTimes();
                unset( $lags[0] );
                $this->output( gmdate( 'H:i:s' ) . ' ' );
                foreach ( $lags as $lag ) {
                    $this->output(
                        sprintf(
                            "%-12s ",
                            $lag === false ? 'replication stopped or errored' : $lag
                        )
                    );
                }
                $this->output( "\n" );
                sleep( 5 );
            } while ( !$this->stopReporting );
 
        } else {
            $lags = $lb->getLagTimes();
            foreach ( $lags as $i => $lag ) {
                $name = $lb->getServerName( $i );
                $this->output(
                    sprintf(
                        "%-20s %s\n",
                        $name,
                        $lag === false ? 'replication stopped or errored' : $lag
                    )
                );
            }
        }
    }
}
 
// @codeCoverageIgnoreStart
$maintClass = DatabaseLag::class;
require_once RUN_MAINTENANCE_IF_MAIN;
// @codeCoverageIgnoreEnd