includes/deferred/UserEditCountUpdate.php

   1 <?php
   2 /**
   3  * User edit count incrementing.
   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  */
  22
  23 use Wikimedia\Assert\Assert;
  24 use MediaWiki\MediaWikiServices;
  25
  26 /**
  27  * Handles increment the edit count for a given set of users
  28  */
  29 class UserEditCountUpdate implements DeferrableUpdate, MergeableUpdate {
  30         /** @var array[] Map of (user ID => ('increment': int, 'instances': User[])) */
  31         private $infoByUser;
  32
  33         /**
  34          * @param User $user
  35          * @param int $increment
  36          */
  37         public function __construct( User $user, $increment ) {
  38                 if ( !$user->getId() ) {
  39                         throw new RuntimeException( "Got user ID of zero" );
  40                 }
  41                 $this->infoByUser = [
  42                         $user->getId() => [ 'increment' => $increment, 'instances' => [ $user ] ]
  43                 ];
  44         }
  45
  46         public function merge( MergeableUpdate $update ) {
  47                 /** @var UserEditCountUpdate $update */
  48                 Assert::parameterType( __CLASS__, $update, '$update' );
  49
  50                 foreach ( $update->infoByUser as $userId => $info ) {
  51                         if ( !isset( $this->infoByUser[$userId] ) ) {
  52                                 $this->infoByUser[$userId] = [ 'increment' => 0, 'instances' => [] ];
  53                         }
  54                         // Merge the increment amount
  55                         $this->infoByUser[$userId]['increment'] += $info['increment'];
  56                         // Merge the list of User instances to update in doUpdate()
  57                         foreach ( $info['instances'] as $user ) {
  58                                 if ( !in_array( $user, $this->infoByUser[$userId]['instances'], true ) ) {
  59                                         $this->infoByUser[$userId]['instances'][] = $user;
  60                                 }
  61                         }
  62                 }
  63         }
  64
  65         /**
  66          * Purges the list of URLs passed to the constructor.
  67          */
  68         public function doUpdate() {
  69                 $lb = MediaWikiServices::getInstance()->getDBLoadBalancer();
  70                 $dbw = $lb->getConnectionRef( DB_MASTER );
  71                 $fname = __METHOD__;
  72
  73                 ( new AutoCommitUpdate( $dbw, __METHOD__, function () use ( $lb, $dbw, $fname ) {
  74                         foreach ( $this->infoByUser as $userId => $info ) {
  75                                 $dbw->update(
  76                                         'user',
  77                                         [ 'user_editcount=user_editcount+' . (int)$info['increment'] ],
  78                                         [ 'user_id' => $userId, 'user_editcount IS NOT NULL' ],
  79                                         $fname
  80                                 );
  81                                 /** @var User[] $affectedInstances */
  82                                 $affectedInstances = $info['instances'];
  83                                 // Lazy initialization check...
  84                                 if ( $dbw->affectedRows() == 0 ) {
  85                                         // The user_editcount is probably NULL (e.g. not initialized).
  86                                         // Since this update runs after the new revisions were committed,
  87                                         // wait for the replica DB to catch up so they will be counted.
  88                                         $dbr = $lb->getConnectionRef( DB_REPLICA );
  89                                         // If $dbr is actually the master DB, then clearing the snapshot
  90                                         // is harmless and waitForMasterPos() will just no-op.
  91                                         $dbr->flushSnapshot( $fname );
  92                                         $lb->waitForMasterPos( $dbr );
  93                                         $affectedInstances[0]->initEditCountInternal( $dbr );
  94                                 }
  95                                 $newCount = (int)$dbw->selectField(
  96                                         'user',
  97                                         'user_editcount',
  98                                         [ 'user_id' => $userId ],
  99                                         $fname
 100                                 );
 101
 102                                 // Update the edit count in the instance caches. This is mostly useful
 103                                 // for maintenance scripts, where deferred updates might run immediately
 104                                 // and user instances might be reused for a long time.
 105                                 foreach ( $affectedInstances as $affectedInstance ) {
 106                                         $affectedInstance->setEditCountInternal( $newCount );
 107                                 }
 108                                 // Clear the edit count in user cache too
 109                                 $affectedInstances[0]->invalidateCache();
 110                         }
 111                 } ) )->doUpdate();
 112         }
 113 }