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diff --git a/www/wiki/includes/ConfiguredReadOnlyMode.php b/www/wiki/includes/ConfiguredReadOnlyMode.php
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+++ b/www/wiki/includes/ConfiguredReadOnlyMode.php
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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;
+	}
+}