From f4ad20c1d4a99c4c471e9f841911be1780a6ddd9 Mon Sep 17 00:00:00 2001
From: Max Semenik <maxsem.wiki@gmail.com>
Date: Fri, 4 Mar 2016 14:41:50 -0800
Subject: [PATCH] Instrument diff timing

Bug: T128697
Change-Id: I748286abac025092abc33b3b7b8a0d3dabafdd25
---
 includes/diff/DifferenceEngine.php | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/includes/diff/DifferenceEngine.php b/includes/diff/DifferenceEngine.php
index 1fa19704db..1cf3918a45 100644
--- a/includes/diff/DifferenceEngine.php
+++ b/includes/diff/DifferenceEngine.php
@@ -842,6 +842,24 @@ class DifferenceEngine extends ContextSource {
 	 * @return bool|string
 	 */
 	public function generateTextDiffBody( $otext, $ntext ) {
+		$time = microtime( true );
+
+		$result = $this->textDiff( $otext, $ntext );
+
+		$time = microtime( true ) - $time;
+		$this->getStats()->timing( 'diff_time', $time );
+
+		return $result;
+	}
+
+	/**
+	 * Generates diff, to be wrapped internally in a logging/instrumentation
+	 *
+	 * @param string $otext Old text, must be already segmented
+	 * @param string $ntext New text, must be already segmented
+	 * @return bool|string
+	 */
+	protected function textDiff( $otext, $ntext ) {
 		global $wgExternalDiffEngine, $wgContLang;
 
 		$otext = str_replace( "\r\n", "\n", $otext );
-- 
2.20.1