00001 <?php
00002
00003 class ChangesFeed {
00004
00005 public $format, $type, $titleMsg, $descMsg;
00006
00007 public function __construct( $format, $type ) {
00008 $this->format = $format;
00009 $this->type = $type;
00010 }
00011
00012 public function getFeedObject( $title, $description ) {
00013 global $wgSitename, $wgContLanguageCode, $wgFeedClasses, $wgTitle;
00014 $feedTitle = "$wgSitename - {$title} [$wgContLanguageCode]";
00015 if( !isset($wgFeedClasses[$this->format] ) )
00016 return false;
00017 return new $wgFeedClasses[$this->format](
00018 $feedTitle, htmlspecialchars( $description ), $wgTitle->getFullUrl() );
00019 }
00020
00021 public function execute( $feed, $rows, $limit=0, $hideminor=false, $lastmod=false, $target='' ) {
00022 global $messageMemc, $wgFeedCacheTimeout;
00023 global $wgSitename, $wgContLanguageCode;
00024
00025 if ( !FeedUtils::checkFeedOutput( $this->format ) ) {
00026 return;
00027 }
00028
00029 $timekey = wfMemcKey( $this->type, $this->format, 'timestamp' );
00030 $key = wfMemcKey( $this->type, $this->format, $limit, $hideminor, $target );
00031
00032 FeedUtils::checkPurge($timekey, $key);
00033
00034
00035
00036
00037
00038
00039 $cachedFeed = $this->loadFromCache( $lastmod, $timekey, $key );
00040 if( is_string( $cachedFeed ) ) {
00041 wfDebug( "RC: Outputting cached feed\n" );
00042 $feed->httpHeaders();
00043 echo $cachedFeed;
00044 } else {
00045 wfDebug( "RC: rendering new feed and caching it\n" );
00046 ob_start();
00047 self::generateFeed( $rows, $feed );
00048 $cachedFeed = ob_get_contents();
00049 ob_end_flush();
00050 $this->saveToCache( $cachedFeed, $timekey, $key );
00051 }
00052 return true;
00053 }
00054
00055 public function saveToCache( $feed, $timekey, $key ) {
00056 global $messageMemc;
00057 $expire = 3600 * 24; # One day
00058 $messageMemc->set( $key, $feed );
00059 $messageMemc->set( $timekey, wfTimestamp( TS_MW ), $expire );
00060 }
00061
00062 public function loadFromCache( $lastmod, $timekey, $key ) {
00063 global $wgFeedCacheTimeout, $messageMemc;
00064 $feedLastmod = $messageMemc->get( $timekey );
00065
00066 if( ( $wgFeedCacheTimeout > 0 ) && $feedLastmod ) {
00067
00068
00069
00070
00071
00072
00073
00074 $feedAge = time() - wfTimestamp( TS_UNIX, $feedLastmod );
00075 $feedLastmodUnix = wfTimestamp( TS_UNIX, $feedLastmod );
00076 $lastmodUnix = wfTimestamp( TS_UNIX, $lastmod );
00077
00078 if( $feedAge < $wgFeedCacheTimeout || $feedLastmodUnix > $lastmodUnix) {
00079 wfDebug( "RC: loading feed from cache ($key; $feedLastmod; $lastmod)...\n" );
00080 return $messageMemc->get( $key );
00081 } else {
00082 wfDebug( "RC: cached feed timestamp check failed ($feedLastmod; $lastmod)\n" );
00083 }
00084 }
00085 return false;
00086 }
00087
00093 public static function generateFeed( $rows, &$feed ) {
00094 wfProfileIn( __METHOD__ );
00095
00096 $feed->outHeader();
00097
00098 # Merge adjacent edits by one user
00099 $sorted = array();
00100 $n = 0;
00101 foreach( $rows as $obj ) {
00102 if( $n > 0 &&
00103 $obj->rc_namespace >= 0 &&
00104 $obj->rc_cur_id == $sorted[$n-1]->rc_cur_id &&
00105 $obj->rc_user_text == $sorted[$n-1]->rc_user_text ) {
00106 $sorted[$n-1]->rc_last_oldid = $obj->rc_last_oldid;
00107 } else {
00108 $sorted[$n] = $obj;
00109 $n++;
00110 }
00111 }
00112
00113 foreach( $sorted as $obj ) {
00114 $title = Title::makeTitle( $obj->rc_namespace, $obj->rc_title );
00115 $talkpage = $title->getTalkPage();
00116 $item = new FeedItem(
00117 $title->getPrefixedText(),
00118 FeedUtils::formatDiff( $obj ),
00119 $title->getFullURL( 'diff=' . $obj->rc_this_oldid . '&oldid=prev' ),
00120 $obj->rc_timestamp,
00121 ($obj->rc_deleted & Revision::DELETED_USER) ? wfMsgHtml('rev-deleted-user') : $obj->rc_user_text,
00122 $talkpage->getFullURL()
00123 );
00124 $feed->outItem( $item );
00125 }
00126 $feed->outFooter();
00127 wfProfileOut( __METHOD__ );
00128 }
00129
00130 }