ReadOnlyMode.php

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<?php
 
use Wikimedia\Rdbms\LoadBalancer;
 
class ReadOnlyMode {
    private $configuredReadOnly;
 
    private $loadBalancer;
 
    public function __construct( ConfiguredReadOnlyMode $cro, LoadBalancer $loadBalancer ) {
        $this->configuredReadOnly = $cro;
        $this->loadBalancer = $loadBalancer;
    }
 
    public function isReadOnly() {
        return $this->getReason() !== false;
    }
 
    public function getReason() {
        $reason = $this->configuredReadOnly->getReason();
        if ( $reason !== false ) {
            return $reason;
        }
        $reason = $this->loadBalancer->getReadOnlyReason();
        if ( $reason !== false && $reason !== null ) {
            return $reason;
        }
        return false;
    }
 
    public function setReason( $msg ) {
        $this->configuredReadOnly->setReason( $msg );
    }
}