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<?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__ );
}
}
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