includes/SiteStats.php

   1 <?php
   2
   3 /**
   4  * Static accessor class for site_stats and related things
   5  */
   6 class SiteStats {
   7         static $row, $loaded = false;
   8         static $admins, $jobs;
   9         static $pageCount = array();
  10         static $groupMemberCounts = array();
  11
  12         static function recache() {
  13                 self::load( true );
  14         }
  15
  16         static function load( $recache = false ) {
  17                 if ( self::$loaded && !$recache ) {
  18                         return;
  19                 }
  20
  21                 self::$row = self::loadAndLazyInit();
  22
  23                 # This code is somewhat schema-agnostic, because I'm changing it in a minor release -- TS
  24                 if ( !isset( self::$row->ss_total_pages ) && self::$row->ss_total_pages == -1 ) {
  25                         # Update schema
  26                         $u = new SiteStatsUpdate( 0, 0, 0 );
  27                         $u->doUpdate();
  28                         $dbr = wfGetDB( DB_SLAVE );
  29                         self::$row = $dbr->selectRow( 'site_stats', '*', false, __METHOD__ );
  30                 }
  31
  32                 self::$loaded = true;
  33         }
  34
  35         static function loadAndLazyInit() {
  36                 wfDebug( __METHOD__ . ": reading site_stats from slave\n" );
  37                 $row = self::doLoad( wfGetDB( DB_SLAVE ) );
  38
  39                 if( !self::isSane( $row ) ) {
  40                         // Might have just been initialized during this request? Underflow?
  41                         wfDebug( __METHOD__ . ": site_stats damaged or missing on slave\n" );
  42                         $row = self::doLoad( wfGetDB( DB_MASTER ) );
  43                 }
  44
  45                 if( !self::isSane( $row ) ) {
  46                         // Normally the site_stats table is initialized at install time.
  47                         // Some manual construction scenarios may leave the table empty or
  48                         // broken, however, for instance when importing from a dump into a
  49                         // clean schema with mwdumper.
  50                         wfDebug( __METHOD__ . ": initializing damaged or missing site_stats\n" );
  51
  52                         global $IP;
  53                         require_once "$IP/maintenance/initStats.inc";
  54
  55                         ob_start();
  56                         wfInitStats();
  57                         ob_end_clean();
  58
  59                         $row = self::doLoad( wfGetDB( DB_MASTER ) );
  60                 }
  61
  62                 if( !self::isSane( $row ) ) {
  63                         wfDebug( __METHOD__ . ": site_stats persistently nonsensical o_O\n" );
  64                 }
  65                 return $row;
  66         }
  67
  68         static function doLoad( $db ) {
  69                 return $db->selectRow( 'site_stats', '*', false, __METHOD__ );
  70         }
  71
  72         static function views() {
  73                 self::load();
  74                 return self::$row->ss_total_views;
  75         }
  76
  77         static function edits() {
  78                 self::load();
  79                 return self::$row->ss_total_edits;
  80         }
  81
  82         static function articles() {
  83                 self::load();
  84                 return self::$row->ss_good_articles;
  85         }
  86
  87         static function pages() {
  88                 self::load();
  89                 return self::$row->ss_total_pages;
  90         }
  91
  92         static function users() {
  93                 self::load();
  94                 return self::$row->ss_users;
  95         }
  96
  97         static function images() {
  98                 self::load();
  99                 return self::$row->ss_images;
 100         }
 101
 102         /**
 103          * @deprecated Use self::numberingroup('sysop') instead
 104          */
 105         static function admins() {
 106                 wfDeprecated(__METHOD__);
 107                 return self::numberingroup('sysop');
 108         }
 109
 110         /**
 111          * Find the number of users in a given user group.
 112          * @param string $group Name of group
 113          * @return int
 114          */
 115         static function numberingroup($group) {
 116                 if ( !isset( self::$groupMemberCounts[$group] ) ) {
 117                         $dbr = wfGetDB( DB_SLAVE );
 118                         self::$groupMemberCounts[$group] = $dbr->selectField( 'user_groups', 'COUNT(*)',
 119                                                                                                         array( 'ug_group' => $group ), __METHOD__ );
 120                 }
 121                 return self::$groupMemberCounts[$group];
 122         }
 123
 124         static function jobs() {
 125                 if ( !isset( self::$jobs ) ) {
 126                         $dbr = wfGetDB( DB_SLAVE );
 127                         self::$jobs = $dbr->estimateRowCount('job');
 128                         /* Zero rows still do single row read for row that doesn't exist, but people are annoyed by that */
 129                         if (self::$jobs == 1) {
 130                                 self::$jobs = 0;
 131                         }
 132                 }
 133                 return self::$jobs;
 134         }
 135
 136         static function pagesInNs( $ns ) {
 137                 wfProfileIn( __METHOD__ );
 138                 if( !isset( self::$pageCount[$ns] ) ) {
 139                         $dbr = wfGetDB( DB_SLAVE );
 140                         $pageCount[$ns] = (int)$dbr->selectField( 'page', 'COUNT(*)', array( 'page_namespace' => $ns ), __METHOD__ );
 141                 }
 142                 wfProfileOut( __METHOD__ );
 143                 return $pageCount[$ns];
 144         }
 145
 146         /** Is the provided row of site stats sane, or should it be regenerated? */
 147         private static function isSane( $row ) {
 148                 if(
 149                         $row === false
 150                         or $row->ss_total_pages < $row->ss_good_articles
 151                         or $row->ss_total_edits < $row->ss_total_pages
 152                         or $row->ss_users       < $row->ss_admins
 153                 ) {
 154                         return false;
 155                 }
 156                 // Now check for underflow/overflow
 157                 foreach( array( 'total_views', 'total_edits', 'good_articles',
 158                 'total_pages', 'users', 'admins', 'images' ) as $member ) {
 159                         if(
 160                                    $row->{"ss_$member"} > 2000000000
 161                                 or $row->{"ss_$member"} < 0
 162                         ) {
 163                                 return false;
 164                         }
 165                 }
 166                 return true;
 167         }
 168 }
 169
 170
 171 /**
 172  *
 173  */
 174 class SiteStatsUpdate {
 175
 176         var $mViews, $mEdits, $mGood, $mPages, $mUsers;
 177
 178         function __construct( $views, $edits, $good, $pages = 0, $users = 0 ) {
 179                 $this->mViews = $views;
 180                 $this->mEdits = $edits;
 181                 $this->mGood = $good;
 182                 $this->mPages = $pages;
 183                 $this->mUsers = $users;
 184         }
 185
 186         function appendUpdate( &$sql, $field, $delta ) {
 187                 if ( $delta ) {
 188                         if ( $sql ) {
 189                                 $sql .= ',';
 190                         }
 191                         if ( $delta < 0 ) {
 192                                 $sql .= "$field=$field-1";
 193                         } else {
 194                                 $sql .= "$field=$field+1";
 195                         }
 196                 }
 197         }
 198
 199         function doUpdate() {
 200                 $fname = 'SiteStatsUpdate::doUpdate';
 201                 $dbw = wfGetDB( DB_MASTER );
 202
 203                 # First retrieve the row just to find out which schema we're in
 204                 $row = $dbw->selectRow( 'site_stats', '*', false, $fname );
 205
 206                 $updates = '';
 207
 208                 $this->appendUpdate( $updates, 'ss_total_views', $this->mViews );
 209                 $this->appendUpdate( $updates, 'ss_total_edits', $this->mEdits );
 210                 $this->appendUpdate( $updates, 'ss_good_articles', $this->mGood );
 211
 212                 if ( isset( $row->ss_total_pages ) ) {
 213                         # Update schema if required
 214                         if ( $row->ss_total_pages == -1 && !$this->mViews ) {
 215                                 $dbr = wfGetDB( DB_SLAVE, array( 'SpecialStatistics', 'vslow') );
 216                                 list( $page, $user ) = $dbr->tableNamesN( 'page', 'user' );
 217
 218                                 $sql = "SELECT COUNT(page_namespace) AS total FROM $page";
 219                                 $res = $dbr->query( $sql, $fname );
 220                                 $pageRow = $dbr->fetchObject( $res );
 221                                 $pages = $pageRow->total + $this->mPages;
 222
 223                                 $sql = "SELECT COUNT(user_id) AS total FROM $user";
 224                                 $res = $dbr->query( $sql, $fname );
 225                                 $userRow = $dbr->fetchObject( $res );
 226                                 $users = $userRow->total + $this->mUsers;
 227
 228                                 if ( $updates ) {
 229                                         $updates .= ',';
 230                                 }
 231                                 $updates .= "ss_total_pages=$pages, ss_users=$users";
 232                         } else {
 233                                 $this->appendUpdate( $updates, 'ss_total_pages', $this->mPages );
 234                                 $this->appendUpdate( $updates, 'ss_users', $this->mUsers );
 235                         }
 236                 }
 237                 if ( $updates ) {
 238                         $site_stats = $dbw->tableName( 'site_stats' );
 239                         $sql = $dbw->limitResultForUpdate("UPDATE $site_stats SET $updates", 1);
 240                         $dbw->begin();
 241                         $dbw->query( $sql, $fname );
 242                         $dbw->commit();
 243                 }
 244
 245                 /*
 246                 global $wgDBname, $wgTitle;
 247                 if ( $this->mGood && $wgDBname == 'enwiki' ) {
 248                         $good = $dbw->selectField( 'site_stats', 'ss_good_articles', '', $fname );
 249                         error_log( $good . ' ' . $wgTitle->getPrefixedDBkey() . "\n", 3, '/home/wikipedia/logs/million.log' );
 250                 }
 251                 */
 252         }
 253 }