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<?php
use Liuggio\StatsdClient\Factory\StatsdDataFactoryInterface;
use MediaWiki\Linker\LinkTarget;
use Wikimedia\Assert\Assert;
/**
* Storage layer class for WatchedItems.
* Database interaction.
*
* @author Addshore
*
* @since 1.27
*/
class WatchedItemStore implements StatsdAwareInterface {
const SORT_DESC = 'DESC';
const SORT_ASC = 'ASC';
/**
* @var LoadBalancer
*/
private $loadBalancer;
/**
* @var HashBagOStuff
*/
private $cache;
/**
* @var array[] Looks like $cacheIndex[Namespace ID][Target DB Key][User Id] => 'key'
* The index is needed so that on mass changes all relevant items can be un-cached.
* For example: Clearing a users watchlist of all items or updating notification timestamps
* for all users watching a single target.
*/
private $cacheIndex = [];
/**
* @var callable|null
*/
private $deferredUpdatesAddCallableUpdateCallback;
/**
* @var callable|null
*/
private $revisionGetTimestampFromIdCallback;
/**
* @var StatsdDataFactoryInterface
*/
private $stats;
/**
* @var self|null
*/
private static $instance;
/**
* @param LoadBalancer $loadBalancer
* @param HashBagOStuff $cache
*/
public function __construct(
LoadBalancer $loadBalancer,
HashBagOStuff $cache
) {
$this->loadBalancer = $loadBalancer;
$this->cache = $cache;
$this->stats = new NullStatsdDataFactory();
$this->deferredUpdatesAddCallableUpdateCallback = [ 'DeferredUpdates', 'addCallableUpdate' ];
$this->revisionGetTimestampFromIdCallback = [ 'Revision', 'getTimestampFromId' ];
}
public function setStatsdDataFactory( StatsdDataFactoryInterface $stats ) {
$this->stats = $stats;
}
/**
* Overrides the DeferredUpdates::addCallableUpdate callback
* This is intended for use while testing and will fail if MW_PHPUNIT_TEST is not defined.
*
* @param callable $callback
*
* @see DeferredUpdates::addCallableUpdate for callback signiture
*
* @return ScopedCallback to reset the overridden value
* @throws MWException
*/
public function overrideDeferredUpdatesAddCallableUpdateCallback( $callback ) {
if ( !defined( 'MW_PHPUNIT_TEST' ) ) {
throw new MWException(
'Cannot override DeferredUpdates::addCallableUpdate callback in operation.'
);
}
Assert::parameterType( 'callable', $callback, '$callback' );
$previousValue = $this->deferredUpdatesAddCallableUpdateCallback;
$this->deferredUpdatesAddCallableUpdateCallback = $callback;
return new ScopedCallback( function() use ( $previousValue ) {
$this->deferredUpdatesAddCallableUpdateCallback = $previousValue;
} );
}
/**
* Overrides the Revision::getTimestampFromId callback
* This is intended for use while testing and will fail if MW_PHPUNIT_TEST is not defined.
*
* @param callable $callback
* @see Revision::getTimestampFromId for callback signiture
*
* @return ScopedCallback to reset the overridden value
* @throws MWException
*/
public function overrideRevisionGetTimestampFromIdCallback( $callback ) {
if ( !defined( 'MW_PHPUNIT_TEST' ) ) {
throw new MWException(
'Cannot override Revision::getTimestampFromId callback in operation.'
);
}
Assert::parameterType( 'callable', $callback, '$callback' );
$previousValue = $this->revisionGetTimestampFromIdCallback;
$this->revisionGetTimestampFromIdCallback = $callback;
return new ScopedCallback( function() use ( $previousValue ) {
$this->revisionGetTimestampFromIdCallback = $previousValue;
} );
}
/**
* Overrides the default instance of this class
* This is intended for use while testing and will fail if MW_PHPUNIT_TEST is not defined.
*
* If this method is used it MUST also be called with null after a test to ensure a new
* default instance is created next time getDefaultInstance is called.
*
* @param WatchedItemStore|null $store
*
* @return ScopedCallback to reset the overridden value
* @throws MWException
*/
public static function overrideDefaultInstance( WatchedItemStore $store = null ) {
if ( !defined( 'MW_PHPUNIT_TEST' ) ) {
throw new MWException(
'Cannot override ' . __CLASS__ . 'default instance in operation.'
);
}
$previousValue = self::$instance;
self::$instance = $store;
return new ScopedCallback( function() use ( $previousValue ) {
self::$instance = $previousValue;
} );
}
/**
* @return self
*/
public static function getDefaultInstance() {
if ( !self::$instance ) {
self::$instance = new self(
wfGetLB(),
new HashBagOStuff( [ 'maxKeys' => 100 ] )
);
self::$instance->setStatsdDataFactory( RequestContext::getMain()->getStats() );
}
return self::$instance;
}
private function getCacheKey( User $user, LinkTarget $target ) {
return $this->cache->makeKey(
(string)$target->getNamespace(),
$target->getDBkey(),
(string)$user->getId()
);
}
private function cache( WatchedItem $item ) {
$user = $item->getUser();
$target = $item->getLinkTarget();
$key = $this->getCacheKey( $user, $target );
$this->cache->set( $key, $item );
$this->cacheIndex[$target->getNamespace()][$target->getDBkey()][$user->getId()] = $key;
$this->stats->increment( 'WatchedItemStore.cache' );
}
private function uncache( User $user, LinkTarget $target ) {
$this->cache->delete( $this->getCacheKey( $user, $target ) );
unset( $this->cacheIndex[$target->getNamespace()][$target->getDBkey()][$user->getId()] );
$this->stats->increment( 'WatchedItemStore.uncache' );
}
private function uncacheLinkTarget( LinkTarget $target ) {
if ( !isset( $this->cacheIndex[$target->getNamespace()][$target->getDBkey()] ) ) {
return;
}
$this->stats->increment( 'WatchedItemStore.uncacheLinkTarget' );
foreach ( $this->cacheIndex[$target->getNamespace()][$target->getDBkey()] as $key ) {
$this->stats->increment( 'WatchedItemStore.uncacheLinkTarget.items' );
$this->cache->delete( $key );
}
}
/**
* @param User $user
* @param LinkTarget $target
*
* @return WatchedItem|null
*/
private function getCached( User $user, LinkTarget $target ) {
return $this->cache->get( $this->getCacheKey( $user, $target ) );
}
/**
* Return an array of conditions to select or update the appropriate database
* row.
*
* @param User $user
* @param LinkTarget $target
*
* @return array
*/
private function dbCond( User $user, LinkTarget $target ) {
return [
'wl_user' => $user->getId(),
'wl_namespace' => $target->getNamespace(),
'wl_title' => $target->getDBkey(),
];
}
/**
* @param int $slaveOrMaster DB_MASTER or DB_SLAVE
*
* @return DatabaseBase
* @throws MWException
*/
private function getConnection( $slaveOrMaster ) {
return $this->loadBalancer->getConnection( $slaveOrMaster, [ 'watchlist' ] );
}
/**
* @param DatabaseBase $connection
*
* @throws MWException
*/
private function reuseConnection( $connection ) {
$this->loadBalancer->reuseConnection( $connection );
}
/**
* Count the number of individual items that are watched by the user.
* If a subject and corresponding talk page are watched this will return 2.
*
* @param User $user
*
* @return int
*/
public function countWatchedItems( User $user ) {
$dbr = $this->getConnection( DB_SLAVE );
$return = (int)$dbr->selectField(
'watchlist',
'COUNT(*)',
[
'wl_user' => $user->getId()
],
__METHOD__
);
$this->reuseConnection( $dbr );
return $return;
}
/**
* @param LinkTarget $target
*
* @return int
*/
public function countWatchers( LinkTarget $target ) {
$dbr = $this->getConnection( DB_SLAVE );
$return = (int)$dbr->selectField(
'watchlist',
'COUNT(*)',
[
'wl_namespace' => $target->getNamespace(),
'wl_title' => $target->getDBkey(),
],
__METHOD__
);
$this->reuseConnection( $dbr );
return $return;
}
/**
* Number of page watchers who also visited a "recent" edit
*
* @param LinkTarget $target
* @param mixed $threshold timestamp accepted by wfTimestamp
*
* @return int
* @throws DBUnexpectedError
* @throws MWException
*/
public function countVisitingWatchers( LinkTarget $target, $threshold ) {
$dbr = $this->getConnection( DB_SLAVE );
$visitingWatchers = (int)$dbr->selectField(
'watchlist',
'COUNT(*)',
[
'wl_namespace' => $target->getNamespace(),
'wl_title' => $target->getDBkey(),
'wl_notificationtimestamp >= ' .
$dbr->addQuotes( $dbr->timestamp( $threshold ) ) .
' OR wl_notificationtimestamp IS NULL'
],
__METHOD__
);
$this->reuseConnection( $dbr );
return $visitingWatchers;
}
/**
* @param LinkTarget[] $targets
* @param array $options Allowed keys:
* 'minimumWatchers' => int
*
* @return array multi dimensional like $return[$namespaceId][$titleString] = int $watchers
* All targets will be present in the result. 0 either means no watchers or the number
* of watchers was below the minimumWatchers option if passed.
*/
public function countWatchersMultiple( array $targets, array $options = [] ) {
$dbOptions = [ 'GROUP BY' => [ 'wl_namespace', 'wl_title' ] ];
$dbr = $this->getConnection( DB_SLAVE );
if ( array_key_exists( 'minimumWatchers', $options ) ) {
$dbOptions['HAVING'] = 'COUNT(*) >= ' . (int)$options['minimumWatchers'];
}
$lb = new LinkBatch( $targets );
$res = $dbr->select(
'watchlist',
[ 'wl_title', 'wl_namespace', 'watchers' => 'COUNT(*)' ],
[ $lb->constructSet( 'wl', $dbr ) ],
__METHOD__,
$dbOptions
);
$this->reuseConnection( $dbr );
$watchCounts = [];
foreach ( $targets as $linkTarget ) {
$watchCounts[$linkTarget->getNamespace()][$linkTarget->getDBkey()] = 0;
}
foreach ( $res as $row ) {
$watchCounts[$row->wl_namespace][$row->wl_title] = (int)$row->watchers;
}
return $watchCounts;
}
/**
* Number of watchers of each page who have visited recent edits to that page
*
* @param array $targetsWithVisitThresholds array of pairs (LinkTarget $target, mixed $threshold),
* $threshold is:
* - a timestamp of the recent edit if $target exists (format accepted by wfTimestamp)
* - null if $target doesn't exist
* @param int|null $minimumWatchers
* @return array multi-dimensional like $return[$namespaceId][$titleString] = $watchers,
* where $watchers is an int:
* - if the page exists, number of users watching who have visited the page recently
* - if the page doesn't exist, number of users that have the page on their watchlist
* - 0 means there are no visiting watchers or their number is below the minimumWatchers
* option (if passed).
*/
public function countVisitingWatchersMultiple(
array $targetsWithVisitThresholds,
$minimumWatchers = null
) {
$dbr = $this->getConnection( DB_SLAVE );
$conds = $this->getVisitingWatchersCondition( $dbr, $targetsWithVisitThresholds );
$dbOptions = [ 'GROUP BY' => [ 'wl_namespace', 'wl_title' ] ];
if ( $minimumWatchers !== null ) {
$dbOptions['HAVING'] = 'COUNT(*) >= ' . (int)$minimumWatchers;
}
$res = $dbr->select(
'watchlist',
[ 'wl_namespace', 'wl_title', 'watchers' => 'COUNT(*)' ],
$conds,
__METHOD__,
$dbOptions
);
$this->reuseConnection( $dbr );
$watcherCounts = [];
foreach ( $targetsWithVisitThresholds as list( $target ) ) {
/* @var LinkTarget $target */
$watcherCounts[$target->getNamespace()][$target->getDBkey()] = 0;
}
foreach ( $res as $row ) {
$watcherCounts[$row->wl_namespace][$row->wl_title] = (int)$row->watchers;
}
return $watcherCounts;
}
/**
* Generates condition for the query used in a batch count visiting watchers.
*
* @param IDatabase $db
* @param array $targetsWithVisitThresholds array of pairs (LinkTarget, last visit threshold)
* @return string
*/
private function getVisitingWatchersCondition(
IDatabase $db,
array $targetsWithVisitThresholds
) {
$missingTargets = [];
$namespaceConds = [];
foreach ( $targetsWithVisitThresholds as list( $target, $threshold ) ) {
if ( $threshold === null ) {
$missingTargets[] = $target;
continue;
}
/* @var LinkTarget $target */
$namespaceConds[$target->getNamespace()][] = $db->makeList( [
'wl_title = ' . $db->addQuotes( $target->getDBkey() ),
$db->makeList( [
'wl_notificationtimestamp >= ' . $db->addQuotes( $db->timestamp( $threshold ) ),
'wl_notificationtimestamp IS NULL'
], LIST_OR )
], LIST_AND );
}
$conds = [];
foreach ( $namespaceConds as $namespace => $pageConds ) {
$conds[] = $db->makeList( [
'wl_namespace = ' . $namespace,
'(' . $db->makeList( $pageConds, LIST_OR ) . ')'
], LIST_AND );
}
if ( $missingTargets ) {
$lb = new LinkBatch( $missingTargets );
$conds[] = $lb->constructSet( 'wl', $db );
}
return $db->makeList( $conds, LIST_OR );
}
/**
* Get an item (may be cached)
*
* @param User $user
* @param LinkTarget $target
*
* @return WatchedItem|false
*/
public function getWatchedItem( User $user, LinkTarget $target ) {
if ( $user->isAnon() ) {
return false;
}
$cached = $this->getCached( $user, $target );
if ( $cached ) {
$this->stats->increment( 'WatchedItemStore.getWatchedItem.cached' );
return $cached;
}
$this->stats->increment( 'WatchedItemStore.getWatchedItem.load' );
return $this->loadWatchedItem( $user, $target );
}
/**
* Loads an item from the db
*
* @param User $user
* @param LinkTarget $target
*
* @return WatchedItem|false
*/
public function loadWatchedItem( User $user, LinkTarget $target ) {
// Only loggedin user can have a watchlist
if ( $user->isAnon() ) {
return false;
}
$dbr = $this->getConnection( DB_SLAVE );
$row = $dbr->selectRow(
'watchlist',
'wl_notificationtimestamp',
$this->dbCond( $user, $target ),
__METHOD__
);
$this->reuseConnection( $dbr );
if ( !$row ) {
return false;
}
$item = new WatchedItem(
$user,
$target,
$row->wl_notificationtimestamp
);
$this->cache( $item );
return $item;
}
/**
* @param User $user
* @param array $options Allowed keys:
* 'forWrite' => bool defaults to false
* 'sort' => string optional sorting by namespace ID and title
* one of the self::SORT_* constants
*
* @return WatchedItem[]
*/
public function getWatchedItemsForUser( User $user, array $options = [] ) {
$options += [ 'forWrite' => false ];
$dbOptions = [];
if ( array_key_exists( 'sort', $options ) ) {
Assert::parameter(
( in_array( $options['sort'], [ self::SORT_ASC, self::SORT_DESC ] ) ),
'$options[\'sort\']',
'must be SORT_ASC or SORT_DESC'
);
$dbOptions['ORDER BY'] = [
"wl_namespace {$options['sort']}",
"wl_title {$options['sort']}"
];
}
$db = $this->getConnection( $options['forWrite'] ? DB_MASTER : DB_SLAVE );
$res = $db->select(
'watchlist',
[ 'wl_namespace', 'wl_title', 'wl_notificationtimestamp' ],
[ 'wl_user' => $user->getId() ],
__METHOD__,
$dbOptions
);
$this->reuseConnection( $db );
$watchedItems = [];
foreach ( $res as $row ) {
// todo these could all be cached at some point?
$watchedItems[] = new WatchedItem(
$user,
new TitleValue( (int)$row->wl_namespace, $row->wl_title ),
$row->wl_notificationtimestamp
);
}
return $watchedItems;
}
/**
* Must be called separately for Subject & Talk namespaces
*
* @param User $user
* @param LinkTarget $target
*
* @return bool
*/
public function isWatched( User $user, LinkTarget $target ) {
return (bool)$this->getWatchedItem( $user, $target );
}
/**
* @param User $user
* @param LinkTarget[] $targets
*
* @return array multi-dimensional like $return[$namespaceId][$titleString] = $timestamp,
* where $timestamp is:
* - string|null value of wl_notificationtimestamp,
* - false if $target is not watched by $user.
*/
public function getNotificationTimestampsBatch( User $user, array $targets ) {
$timestamps = [];
foreach ( $targets as $target ) {
$timestamps[$target->getNamespace()][$target->getDBkey()] = false;
}
if ( $user->isAnon() ) {
return $timestamps;
}
$targetsToLoad = [];
foreach ( $targets as $target ) {
$cachedItem = $this->getCached( $user, $target );
if ( $cachedItem ) {
$timestamps[$target->getNamespace()][$target->getDBkey()] =
$cachedItem->getNotificationTimestamp();
} else {
$targetsToLoad[] = $target;
}
}
if ( !$targetsToLoad ) {
return $timestamps;
}
$dbr = $this->getConnection( DB_SLAVE );
$lb = new LinkBatch( $targetsToLoad );
$res = $dbr->select(
'watchlist',
[ 'wl_namespace', 'wl_title', 'wl_notificationtimestamp' ],
[
$lb->constructSet( 'wl', $dbr ),
'wl_user' => $user->getId(),
],
__METHOD__
);
$this->reuseConnection( $dbr );
foreach ( $res as $row ) {
$timestamps[$row->wl_namespace][$row->wl_title] = $row->wl_notificationtimestamp;
}
return $timestamps;
}
/**
* Must be called separately for Subject & Talk namespaces
*
* @param User $user
* @param LinkTarget $target
*/
public function addWatch( User $user, LinkTarget $target ) {
$this->addWatchBatchForUser( $user, [ $target ] );
}
/**
* @param User $user
* @param LinkTarget[] $targets
*
* @return bool success
*/
public function addWatchBatchForUser( User $user, array $targets ) {
if ( $this->loadBalancer->getReadOnlyReason() !== false ) {
return false;
}
// Only loggedin user can have a watchlist
if ( $user->isAnon() ) {
return false;
}
if ( !$targets ) {
return true;
}
$rows = [];
foreach ( $targets as $target ) {
$rows[] = [
'wl_user' => $user->getId(),
'wl_namespace' => $target->getNamespace(),
'wl_title' => $target->getDBkey(),
'wl_notificationtimestamp' => null,
];
$this->uncache( $user, $target );
}
$dbw = $this->getConnection( DB_MASTER );
foreach ( array_chunk( $rows, 100 ) as $toInsert ) {
// Use INSERT IGNORE to avoid overwriting the notification timestamp
// if there's already an entry for this page
$dbw->insert( 'watchlist', $toInsert, __METHOD__, 'IGNORE' );
}
$this->reuseConnection( $dbw );
return true;
}
/**
* Removes the an entry for the User watching the LinkTarget
* Must be called separately for Subject & Talk namespaces
*
* @param User $user
* @param LinkTarget $target
*
* @return bool success
* @throws DBUnexpectedError
* @throws MWException
*/
public function removeWatch( User $user, LinkTarget $target ) {
// Only logged in user can have a watchlist
if ( $this->loadBalancer->getReadOnlyReason() !== false || $user->isAnon() ) {
return false;
}
$this->uncache( $user, $target );
$dbw = $this->getConnection( DB_MASTER );
$dbw->delete( 'watchlist',
[
'wl_user' => $user->getId(),
'wl_namespace' => $target->getNamespace(),
'wl_title' => $target->getDBkey(),
], __METHOD__
);
$success = (bool)$dbw->affectedRows();
$this->reuseConnection( $dbw );
return $success;
}
/**
* @param User $editor The editor that triggered the update. Their notification
* timestamp will not be updated(they have already seen it)
* @param LinkTarget $target The target to update timestamps for
* @param string $timestamp Set the update timestamp to this value
*
* @return int[] Array of user IDs the timestamp has been updated for
*/
public function updateNotificationTimestamp( User $editor, LinkTarget $target, $timestamp ) {
$dbw = $this->getConnection( DB_MASTER );
$res = $dbw->select( [ 'watchlist' ],
[ 'wl_user' ],
[
'wl_user != ' . intval( $editor->getId() ),
'wl_namespace' => $target->getNamespace(),
'wl_title' => $target->getDBkey(),
'wl_notificationtimestamp IS NULL',
], __METHOD__
);
$watchers = [];
foreach ( $res as $row ) {
$watchers[] = intval( $row->wl_user );
}
if ( $watchers ) {
// Update wl_notificationtimestamp for all watching users except the editor
$fname = __METHOD__;
$dbw->onTransactionIdle(
function () use ( $dbw, $timestamp, $watchers, $target, $fname ) {
$dbw->update( 'watchlist',
[ /* SET */
'wl_notificationtimestamp' => $dbw->timestamp( $timestamp )
], [ /* WHERE */
'wl_user' => $watchers,
'wl_namespace' => $target->getNamespace(),
'wl_title' => $target->getDBkey(),
], $fname
);
$this->uncacheLinkTarget( $target );
}
);
}
$this->reuseConnection( $dbw );
return $watchers;
}
/**
* Reset the notification timestamp of this entry
*
* @param User $user
* @param Title $title
* @param string $force Whether to force the write query to be executed even if the
* page is not watched or the notification timestamp is already NULL.
* 'force' in order to force
* @param int $oldid The revision id being viewed. If not given or 0, latest revision is assumed.
*
* @return bool success
*/
public function resetNotificationTimestamp( User $user, Title $title, $force = '', $oldid = 0 ) {
// Only loggedin user can have a watchlist
if ( $this->loadBalancer->getReadOnlyReason() !== false || $user->isAnon() ) {
return false;
}
$item = null;
if ( $force != 'force' ) {
$item = $this->loadWatchedItem( $user, $title );
if ( !$item || $item->getNotificationTimestamp() === null ) {
return false;
}
}
// If the page is watched by the user (or may be watched), update the timestamp
$job = new ActivityUpdateJob(
$title,
[
'type' => 'updateWatchlistNotification',
'userid' => $user->getId(),
'notifTime' => $this->getNotificationTimestamp( $user, $title, $item, $force, $oldid ),
'curTime' => time()
]
);
// Try to run this post-send
// Calls DeferredUpdates::addCallableUpdate in normal operation
call_user_func(
$this->deferredUpdatesAddCallableUpdateCallback,
function() use ( $job ) {
$job->run();
}
);
$this->uncache( $user, $title );
return true;
}
private function getNotificationTimestamp( User $user, Title $title, $item, $force, $oldid ) {
if ( !$oldid ) {
// No oldid given, assuming latest revision; clear the timestamp.
return null;
}
if ( !$title->getNextRevisionID( $oldid ) ) {
// Oldid given and is the latest revision for this title; clear the timestamp.
return null;
}
if ( $item === null ) {
$item = $this->loadWatchedItem( $user, $title );
}
if ( !$item ) {
// This can only happen if $force is enabled.
return null;
}
// Oldid given and isn't the latest; update the timestamp.
// This will result in no further notification emails being sent!
// Calls Revision::getTimestampFromId in normal operation
$notificationTimestamp = call_user_func(
$this->revisionGetTimestampFromIdCallback,
$title,
$oldid
);
// We need to go one second to the future because of various strict comparisons
// throughout the codebase
$ts = new MWTimestamp( $notificationTimestamp );
$ts->timestamp->add( new DateInterval( 'PT1S' ) );
$notificationTimestamp = $ts->getTimestamp( TS_MW );
if ( $notificationTimestamp < $item->getNotificationTimestamp() ) {
if ( $force != 'force' ) {
return false;
} else {
// This is a little silly…
return $item->getNotificationTimestamp();
}
}
return $notificationTimestamp;
}
/**
* @param User $user
* @param int $unreadLimit
*
* @return int|bool The number of unread notifications
* true if greater than or equal to $unreadLimit
*/
public function countUnreadNotifications( User $user, $unreadLimit = null ) {
$queryOptions = [];
if ( $unreadLimit !== null ) {
$unreadLimit = (int)$unreadLimit;
$queryOptions['LIMIT'] = $unreadLimit;
}
$dbr = $this->getConnection( DB_SLAVE );
$rowCount = $dbr->selectRowCount(
'watchlist',
'1',
[
'wl_user' => $user->getId(),
'wl_notificationtimestamp IS NOT NULL',
],
__METHOD__,
$queryOptions
);
$this->reuseConnection( $dbr );
if ( !isset( $unreadLimit ) ) {
return $rowCount;
}
if ( $rowCount >= $unreadLimit ) {
return true;
}
return $rowCount;
}
/**
* Check if the given title already is watched by the user, and if so
* add a watch for the new title.
*
* To be used for page renames and such.
*
* @param LinkTarget $oldTarget
* @param LinkTarget $newTarget
*/
public function duplicateAllAssociatedEntries( LinkTarget $oldTarget, LinkTarget $newTarget ) {
$oldTarget = Title::newFromLinkTarget( $oldTarget );
$newTarget = Title::newFromLinkTarget( $newTarget );
$this->duplicateEntry( $oldTarget->getSubjectPage(), $newTarget->getSubjectPage() );
$this->duplicateEntry( $oldTarget->getTalkPage(), $newTarget->getTalkPage() );
}
/**
* Check if the given title already is watched by the user, and if so
* add a watch for the new title.
*
* To be used for page renames and such.
* This must be called separately for Subject and Talk pages
*
* @param LinkTarget $oldTarget
* @param LinkTarget $newTarget
*/
public function duplicateEntry( LinkTarget $oldTarget, LinkTarget $newTarget ) {
$dbw = $this->getConnection( DB_MASTER );
$result = $dbw->select(
'watchlist',
[ 'wl_user', 'wl_notificationtimestamp' ],
[
'wl_namespace' => $oldTarget->getNamespace(),
'wl_title' => $oldTarget->getDBkey(),
],
__METHOD__,
[ 'FOR UPDATE' ]
);
$newNamespace = $newTarget->getNamespace();
$newDBkey = $newTarget->getDBkey();
# Construct array to replace into the watchlist
$values = [];
foreach ( $result as $row ) {
$values[] = [
'wl_user' => $row->wl_user,
'wl_namespace' => $newNamespace,
'wl_title' => $newDBkey,
'wl_notificationtimestamp' => $row->wl_notificationtimestamp,
];
}
if ( !empty( $values ) ) {
# Perform replace
# Note that multi-row replace is very efficient for MySQL but may be inefficient for
# some other DBMSes, mostly due to poor simulation by us
$dbw->replace(
'watchlist',
[ [ 'wl_user', 'wl_namespace', 'wl_title' ] ],
$values,
__METHOD__
);
}
$this->reuseConnection( $dbw );
}
}