From 370e83bb0dfd0c70de268c93bf07ad5ee0897192 Mon Sep 17 00:00:00 2001
From: Pierre Schmitz <pierre@archlinux.de>
Date: Fri, 15 Aug 2008 01:29:47 +0200
Subject: Update auf 1.13.0

---
 includes/ChangesFeed.php | 129 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 129 insertions(+)
 create mode 100644 includes/ChangesFeed.php

(limited to 'includes/ChangesFeed.php')

diff --git a/includes/ChangesFeed.php b/includes/ChangesFeed.php
new file mode 100644
index 00000000..9bee1790
--- /dev/null
+++ b/includes/ChangesFeed.php
@@ -0,0 +1,129 @@
+<?php
+
+class ChangesFeed {
+
+	public $format, $type, $titleMsg, $descMsg;
+
+	public function __construct( $format, $type ) {
+		$this->format = $format;
+		$this->type = $type;
+	}
+
+	public function getFeedObject( $title, $description ) {
+		global $wgSitename, $wgContLanguageCode, $wgFeedClasses, $wgTitle;
+		$feedTitle = "$wgSitename  - {$title} [$wgContLanguageCode]";
+
+		return new $wgFeedClasses[$this->format](
+			$feedTitle, htmlspecialchars( $description ), $wgTitle->getFullUrl() );
+	}
+
+	public function execute( $feed, $rows, $limit = 0 , $hideminor = false, $lastmod = false ) {
+		global $messageMemc, $wgFeedCacheTimeout;
+		global $wgFeedClasses, $wgTitle, $wgSitename, $wgContLanguageCode;
+
+		if ( !FeedUtils::checkFeedOutput( $this->format ) ) {
+			return;
+		}
+
+		$timekey = wfMemcKey( $this->type, $this->format, 'timestamp' );
+		$key = wfMemcKey( $this->type, $this->format, 'limit', $limit, 'minor', $hideminor );
+
+		FeedUtils::checkPurge($timekey, $key);
+
+		/*
+		* Bumping around loading up diffs can be pretty slow, so where
+		* possible we want to cache the feed output so the next visitor
+		* gets it quick too.
+		*/
+		$cachedFeed = $this->loadFromCache( $lastmod, $timekey, $key );
+		if( is_string( $cachedFeed ) ) {
+			wfDebug( "RC: Outputting cached feed\n" );
+			$feed->httpHeaders();
+			echo $cachedFeed;
+		} else {
+			wfDebug( "RC: rendering new feed and caching it\n" );
+			ob_start();
+			self::generateFeed( $rows, $feed );
+			$cachedFeed = ob_get_contents();
+			ob_end_flush();
+			$this->saveToCache( $cachedFeed, $timekey, $key );
+		}
+		return true;
+	}
+
+	public function saveToCache( $feed, $timekey, $key ) {
+		global $messageMemc;
+		$expire = 3600 * 24; # One day
+		$messageMemc->set( $key, $feed );
+		$messageMemc->set( $timekey, wfTimestamp( TS_MW ), $expire );
+	}
+
+	public function loadFromCache( $lastmod, $timekey, $key ) {
+		global $wgFeedCacheTimeout, $messageMemc;
+		$feedLastmod = $messageMemc->get( $timekey );
+
+		if( ( $wgFeedCacheTimeout > 0 ) && $feedLastmod ) {
+			/*
+			* If the cached feed was rendered very recently, we may
+			* go ahead and use it even if there have been edits made
+			* since it was rendered. This keeps a swarm of requests
+			* from being too bad on a super-frequently edited wiki.
+			*/
+
+			$feedAge = time() - wfTimestamp( TS_UNIX, $feedLastmod );
+			$feedLastmodUnix = wfTimestamp( TS_UNIX, $feedLastmod );
+			$lastmodUnix = wfTimestamp( TS_UNIX, $lastmod );
+
+			if( $feedAge < $wgFeedCacheTimeout || $feedLastmodUnix > $lastmodUnix) {
+				wfDebug( "RC: loading feed from cache ($key; $feedLastmod; $lastmod)...\n" );
+				return $messageMemc->get( $key );
+			} else {
+				wfDebug( "RC: cached feed timestamp check failed ($feedLastmod; $lastmod)\n" );
+			}
+		}
+		return false;
+	}
+
+	/**
+	* @todo document
+	* @param $rows Database resource with recentchanges rows
+	* @param $feed Feed object
+	*/
+	public static function generateFeed( $rows, &$feed ) {
+		wfProfileIn( __METHOD__ );
+
+		$feed->outHeader();
+
+		# Merge adjacent edits by one user
+		$sorted = array();
+		$n = 0;
+		foreach( $rows as $obj ) {
+			if( $n > 0 &&
+				$obj->rc_namespace >= 0 &&
+				$obj->rc_cur_id == $sorted[$n-1]->rc_cur_id &&
+				$obj->rc_user_text == $sorted[$n-1]->rc_user_text ) {
+				$sorted[$n-1]->rc_last_oldid = $obj->rc_last_oldid;
+			} else {
+				$sorted[$n] = $obj;
+				$n++;
+			}
+		}
+
+		foreach( $sorted as $obj ) {
+			$title = Title::makeTitle( $obj->rc_namespace, $obj->rc_title );
+			$talkpage = $title->getTalkPage();
+			$item = new FeedItem(
+				$title->getPrefixedText(),
+				FeedUtils::formatDiff( $obj ),
+				$title->getFullURL( 'diff=' . $obj->rc_this_oldid . '&oldid=prev' ),
+				$obj->rc_timestamp,
+				($obj->rc_deleted & Revision::DELETED_USER) ? wfMsgHtml('rev-deleted-user') : $obj->rc_user_text,
+				$talkpage->getFullURL()
+				);
+			$feed->outItem( $item );
+		}
+		$feed->outFooter();
+		wfProfileOut( __METHOD__ );
+	}
+
+}
\ No newline at end of file
-- 
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