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<?php
/**
* Caches current user names and other info based on user IDs.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup Cache
*/
/**
* @since 1.20
*/
class UserCache {
protected $cache = array(); // (uid => property => value)
protected $typesCached = array(); // (uid => cache type => 1)
/**
* @return UserCache
*/
public static function singleton() {
static $instance = null;
if ( $instance === null ) {
$instance = new self();
}
return $instance;
}
protected function __construct() {
}
/**
* Get a property of a user based on their user ID
*
* @param int $userId User ID
* @param string $prop User property
* @return mixed|bool The property or false if the user does not exist
*/
public function getProp( $userId, $prop ) {
if ( !isset( $this->cache[$userId][$prop] ) ) {
wfDebug( __METHOD__ . ": querying DB for prop '$prop' for user ID '$userId'.\n" );
$this->doQuery( array( $userId ) ); // cache miss
}
return isset( $this->cache[$userId][$prop] )
? $this->cache[$userId][$prop]
: false; // user does not exist?
}
/**
* Get the name of a user or return $ip if the user ID is 0
*
* @param int $userId
* @param string $ip
* @return string
* @since 1.22
*/
public function getUserName( $userId, $ip ) {
return $userId > 0 ? $this->getProp( $userId, 'name' ) : $ip;
}
/**
* Preloads user names for given list of users.
* @param array $userIds List of user IDs
* @param array $options Option flags; include 'userpage' and 'usertalk'
* @param string $caller The calling method
*/
public function doQuery( array $userIds, $options = array(), $caller = '' ) {
$usersToCheck = array();
$usersToQuery = array();
$userIds = array_unique( $userIds );
foreach ( $userIds as $userId ) {
$userId = (int)$userId;
if ( $userId <= 0 ) {
continue; // skip anons
}
if ( isset( $this->cache[$userId]['name'] ) ) {
$usersToCheck[$userId] = $this->cache[$userId]['name']; // already have name
} else {
$usersToQuery[] = $userId; // we need to get the name
}
}
// Lookup basic info for users not yet loaded...
if ( count( $usersToQuery ) ) {
$dbr = wfGetDB( DB_SLAVE );
$table = array( 'user' );
$conds = array( 'user_id' => $usersToQuery );
$fields = array( 'user_name', 'user_real_name', 'user_registration', 'user_id' );
$comment = __METHOD__;
if ( strval( $caller ) !== '' ) {
$comment .= "/$caller";
}
$res = $dbr->select( $table, $fields, $conds, $comment );
foreach ( $res as $row ) { // load each user into cache
$userId = (int)$row->user_id;
$this->cache[$userId]['name'] = $row->user_name;
$this->cache[$userId]['real_name'] = $row->user_real_name;
$this->cache[$userId]['registration'] = $row->user_registration;
$usersToCheck[$userId] = $row->user_name;
}
}
$lb = new LinkBatch();
foreach ( $usersToCheck as $userId => $name ) {
if ( $this->queryNeeded( $userId, 'userpage', $options ) ) {
$lb->add( NS_USER, str_replace( ' ', '_', $row->user_name ) );
$this->typesCached[$userId]['userpage'] = 1;
}
if ( $this->queryNeeded( $userId, 'usertalk', $options ) ) {
$lb->add( NS_USER_TALK, str_replace( ' ', '_', $row->user_name ) );
$this->typesCached[$userId]['usertalk'] = 1;
}
}
$lb->execute();
}
/**
* Check if a cache type is in $options and was not loaded for this user
*
* @param int $uid User ID
* @param string $type Cache type
* @param array $options Requested cache types
* @return bool
*/
protected function queryNeeded( $uid, $type, array $options ) {
return ( in_array( $type, $options ) && !isset( $this->typesCached[$uid][$type] ) );
}
}
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