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<?php
/**
* A read-only mode service which does not depend on LoadBalancer.
* To obtain an instance, use MediaWikiServices::getConfiguredReadOnlyMode().
*
* @since 1.29
*/
class ConfiguredReadOnlyMode {
/** @var Config */
private $config;
/** @var string|bool|null */
private $fileReason;
/** @var string|null */
private $overrideReason;
public function __construct( Config $config ) {
$this->config = $config;
}
/**
* Check whether the wiki is in read-only mode.
*
* @return bool
*/
public function isReadOnly() {
return $this->getReason() !== false;
}
/**
* Get the value of $wgReadOnly or the contents of $wgReadOnlyFile.
*
* @return string|bool String when in read-only mode; false otherwise
*/
public function getReason() {
if ( $this->overrideReason !== null ) {
return $this->overrideReason;
}
$confReason = $this->config->get( 'ReadOnly' );
if ( $confReason !== null ) {
return $confReason;
}
if ( $this->fileReason === null ) {
// Cache for faster access next time
$readOnlyFile = $this->config->get( 'ReadOnlyFile' );
if ( is_file( $readOnlyFile ) && filesize( $readOnlyFile ) > 0 ) {
$this->fileReason = file_get_contents( $readOnlyFile );
} else {
$this->fileReason = false;
}
}
return $this->fileReason;
}
/**
* Set the read-only mode, which will apply for the remainder of the
* request or until a service reset.
*
* @param string|null $msg
*/
public function setReason( $msg ) {
$this->overrideReason = $msg;
}
/**
* Clear the cache of the read only file
*/
public function clearCache() {
$this->fileReason = null;
}
}
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