includes/cache/GenderCache.php

   1 <?php
   2 /**
   3  * Caches user genders when needed to use correct namespace aliases.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @author Niklas Laxström
  22  * @ingroup Cache
  23  */
  24
  25 /**
  26  * Caches user genders when needed to use correct namespace aliases.
  27  *
  28  * @since 1.18
  29  */
  30 class GenderCache {
  31         protected $cache = array();
  32         protected $default;
  33         protected $misses = 0;
  34         protected $missLimit = 1000;
  35
  36         /**
  37          * @return GenderCache
  38          */
  39         public static function singleton() {
  40                 static $that = null;
  41                 if ( $that === null ) {
  42                         $that = new self();
  43                 }
  44                 return $that;
  45         }
  46
  47         protected function __construct() {}
  48
  49         /**
  50          * Returns the default gender option in this wiki.
  51          * @return String
  52          */
  53         protected function getDefault() {
  54                 if ( $this->default === null ) {
  55                         $this->default = User::getDefaultOption( 'gender' );
  56                 }
  57                 return $this->default;
  58         }
  59
  60         /**
  61          * Returns the gender for given username.
  62          * @param string $username or User: username
  63          * @param string $caller the calling method
  64          * @return String
  65          */
  66         public function getGenderOf( $username, $caller = '' ) {
  67                 global $wgUser;
  68
  69                 if ( $username instanceof User ) {
  70                         $username = $username->getName();
  71                 }
  72
  73                 $username = self::normalizeUsername( $username );
  74                 if ( !isset( $this->cache[$username] ) ) {
  75                         if ( $this->misses >= $this->missLimit && $wgUser->getName() !== $username ) {
  76                                 if ( $this->misses === $this->missLimit ) {
  77                                         $this->misses++;
  78                                         wfDebug( __METHOD__ . ": too many misses, returning default onwards\n" );
  79                                 }
  80                                 return $this->getDefault();
  81
  82                         } else {
  83                                 $this->misses++;
  84                                 $this->doQuery( $username, $caller );
  85                         }
  86                 }
  87
  88                 /* Undefined if there is a valid username which for some reason doesn't
  89                  * exist in the database.
  90                  */
  91                 return isset( $this->cache[$username] ) ? $this->cache[$username] : $this->getDefault();
  92         }
  93
  94         /**
  95          * Wrapper for doQuery that processes raw LinkBatch data.
  96          *
  97          * @param $data
  98          * @param $caller
  99          */
 100         public function doLinkBatch( $data, $caller = '' ) {
 101                 $users = array();
 102                 foreach ( $data as $ns => $pagenames ) {
 103                         if ( !MWNamespace::hasGenderDistinction( $ns ) ) {
 104                                 continue;
 105                         }
 106                         foreach ( array_keys( $pagenames ) as $username ) {
 107                                 $users[$username] = true;
 108                         }
 109                 }
 110
 111                 $this->doQuery( array_keys( $users ), $caller );
 112         }
 113
 114         /**
 115          * Wrapper for doQuery that processes a title or string array.
 116          *
 117          * @since 1.20
 118          * @param $titles List: array of Title objects or strings
 119          * @param string $caller the calling method
 120          */
 121         public function doTitlesArray( $titles, $caller = '' ) {
 122                 $users = array();
 123                 foreach ( $titles as $title ) {
 124                         $titleObj = is_string( $title ) ? Title::newFromText( $title ) : $title;
 125                         if ( !$titleObj ) {
 126                                 continue;
 127                         }
 128                         if ( !MWNamespace::hasGenderDistinction( $titleObj->getNamespace() ) ) {
 129                                 continue;
 130                         }
 131                         $users[] = $titleObj->getText();
 132                 }
 133
 134                 $this->doQuery( $users, $caller );
 135         }
 136
 137         /**
 138          * Preloads genders for given list of users.
 139          * @param $users List|String: usernames
 140          * @param string $caller the calling method
 141          */
 142         public function doQuery( $users, $caller = '' ) {
 143                 $default = $this->getDefault();
 144
 145                 $usersToCheck = array();
 146                 foreach ( (array)$users as $value ) {
 147                         $name = self::normalizeUsername( $value );
 148                         // Skip users whose gender setting we already know
 149                         if ( !isset( $this->cache[$name] ) ) {
 150                                 // For existing users, this value will be overwritten by the correct value
 151                                 $this->cache[$name] = $default;
 152                                 // query only for valid names, which can be in the database
 153                                 if ( User::isValidUserName( $name ) ) {
 154                                         $usersToCheck[] = $name;
 155                                 }
 156                         }
 157                 }
 158
 159                 if ( count( $usersToCheck ) === 0 ) {
 160                         return;
 161                 }
 162
 163                 $dbr = wfGetDB( DB_SLAVE );
 164                 $table = array( 'user', 'user_properties' );
 165                 $fields = array( 'user_name', 'up_value' );
 166                 $conds = array( 'user_name' => $usersToCheck );
 167                 $joins = array( 'user_properties' =>
 168                         array( 'LEFT JOIN', array( 'user_id = up_user', 'up_property' => 'gender' ) ) );
 169
 170                 $comment = __METHOD__;
 171                 if ( strval( $caller ) !== '' ) {
 172                         $comment .= "/$caller";
 173                 }
 174                 $res = $dbr->select( $table, $fields, $conds, $comment, array(), $joins );
 175
 176                 foreach ( $res as $row ) {
 177                         $this->cache[$row->user_name] = $row->up_value ? $row->up_value : $default;
 178                 }
 179         }
 180
 181         private static function normalizeUsername( $username ) {
 182                 // Strip off subpages
 183                 $indexSlash = strpos( $username, '/' );
 184                 if ( $indexSlash !== false ) {
 185                         $username = substr( $username, 0, $indexSlash );
 186                 }
 187                 // normalize underscore/spaces
 188                 return strtr( $username, '_', ' ' );
 189         }
 190 }