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<?php
/**
* Feed to Special:RecentChanges and Special:RecentChangesLiked
*
* @ingroup Feed
*/
class ChangesFeed {
public $format, $type, $titleMsg, $descMsg;
/**
* Constructor
*
* @param $format String: feed's format (either 'rss' or 'atom')
* @param $type String: type of feed (for cache keys)
*/
public function __construct( $format, $type ) {
$this->format = $format;
$this->type = $type;
}
/**
* Get a ChannelFeed subclass object to use
*
* @param $title String: feed's title
* @param $description String: feed's description
* @param $url String: url of origin page
* @return ChannelFeed subclass or false on failure
*/
public function getFeedObject( $title, $description, $url ) {
global $wgSitename, $wgLanguageCode, $wgFeedClasses;
if ( !isset( $wgFeedClasses[$this->format] ) ) {
return false;
}
$feedTitle = "$wgSitename - {$title} [$wgLanguageCode]";
return new $wgFeedClasses[$this->format](
$feedTitle, htmlspecialchars( $description ), $url );
}
/**
* Generates feed's content
*
* @param $feed ChannelFeed subclass object (generally the one returned by getFeedObject())
* @param $rows ResultWrapper object with rows in recentchanges table
* @param $lastmod Integer: timestamp of the last item in the recentchanges table (only used for the cache key)
* @param $opts FormOptions as in SpecialRecentChanges::getDefaultOptions()
* @return null or true
*/
public function execute( $feed, $rows, $lastmod, $opts ) {
global $wgLang, $wgRenderHashAppend;
if ( !FeedUtils::checkFeedOutput( $this->format ) ) {
return;
}
$optionsHash = md5( serialize( $opts->getAllValues() ) ) . $wgRenderHashAppend;
$timekey = wfMemcKey( $this->type, $this->format, $wgLang->getCode(), $optionsHash, 'timestamp' );
$key = wfMemcKey( $this->type, $this->format, $wgLang->getCode(), $optionsHash );
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;
}
/**
* Save to feed result to $messageMemc
*
* @param $feed String: feed's content
* @param $timekey String: memcached key of the last modification
* @param $key String: memcached key of the content
*/
public function saveToCache( $feed, $timekey, $key ) {
global $messageMemc;
$expire = 3600 * 24; # One day
$messageMemc->set( $key, $feed, $expire );
$messageMemc->set( $timekey, wfTimestamp( TS_MW ), $expire );
}
/**
* Try to load the feed result from $messageMemc
*
* @param $lastmod Integer: timestamp of the last item in the recentchanges table
* @param $timekey String: memcached key of the last modification
* @param $key String: memcached key of the content
* @return feed's content on cache hit or false on cache miss
*/
public function loadFromCache( $lastmod, $timekey, $key ) {
global $wgFeedCacheTimeout, $wgOut, $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" );
if ( $feedLastmodUnix < $lastmodUnix ) {
$wgOut->setLastModified( $feedLastmod ); // bug 21916
}
return $messageMemc->get( $key );
} else {
wfDebug( "RC: cached feed timestamp check failed ($feedLastmod; $lastmod)\n" );
}
}
return false;
}
/**
* Generate the feed items given a row from the database.
* @param $rows DatabaseBase 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_type == RC_EDIT &&
$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 = MWNamespace::canTalk( $obj->rc_namespace ) ? $title->getTalkPage()->getFullUrl() : '';
// Skip items with deleted content (avoids partially complete/inconsistent output)
if( $obj->rc_deleted ) continue;
if ( $obj->rc_this_oldid ) {
$url = $title->getFullURL(
'diff=' . $obj->rc_this_oldid .
'&oldid=' . $obj->rc_last_oldid
);
} else {
// log entry or something like that.
$url = $title->getFullURL();
}
$item = new FeedItem(
$title->getPrefixedText(),
FeedUtils::formatDiff( $obj ),
$url,
$obj->rc_timestamp,
($obj->rc_deleted & Revision::DELETED_USER) ? wfMsgHtml('rev-deleted-user') : $obj->rc_user_text,
$talkpage
);
$feed->outItem( $item );
}
$feed->outFooter();
wfProfileOut( __METHOD__ );
}
}
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