includes/ReadOnlyMode.php

   1 <?php
   2
   3 use Wikimedia\Rdbms\LoadBalancer;
   4
   5 /**
   6  * A service class for fetching the wiki's current read-only mode.
   7  * To obtain an instance, use MediaWikiServices::getReadOnlyMode().
   8  *
   9  * @since 1.29
  10  */
  11 class ReadOnlyMode {
  12         /** @var ConfiguredReadOnlyMode */
  13         private $configuredReadOnly;
  14
  15         /** @var LoadBalancer */
  16         private $loadBalancer;
  17
  18         public function __construct( ConfiguredReadOnlyMode $cro, LoadBalancer $loadBalancer ) {
  19                 $this->configuredReadOnly = $cro;
  20                 $this->loadBalancer = $loadBalancer;
  21         }
  22
  23         /**
  24          * Check whether the wiki is in read-only mode.
  25          *
  26          * @return bool
  27          */
  28         public function isReadOnly() {
  29                 return $this->getReason() !== false;
  30         }
  31
  32         /**
  33          * Check if the site is in read-only mode and return the message if so
  34          *
  35          * This checks the configuration and registered DB load balancers for
  36          * read-only mode. This may result in DB connection being made.
  37          *
  38          * @return string|bool String when in read-only mode; false otherwise
  39          */
  40         public function getReason() {
  41                 $reason = $this->configuredReadOnly->getReason();
  42                 if ( $reason !== false ) {
  43                         return $reason;
  44                 }
  45                 $reason = $this->loadBalancer->getReadOnlyReason();
  46                 if ( $reason !== false && $reason !== null ) {
  47                         return $reason;
  48                 }
  49                 return false;
  50         }
  51
  52         /**
  53          * Set the read-only mode, which will apply for the remainder of the
  54          * request or until a service reset.
  55          *
  56          * @param string|null $msg
  57          */
  58         public function setReason( $msg ) {
  59                 $this->configuredReadOnly->setReason( $msg );
  60         }
  61
  62         /**
  63          * Clear the cache of the read only file
  64          */
  65         public function clearCache() {
  66                 $this->configuredReadOnly->clearCache();
  67         }
  68 }