mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/Echo
synced 2024-12-11 07:26:29 +00:00
410 lines
11 KiB
PHP
410 lines
11 KiB
PHP
<?php
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use MediaWiki\MediaWikiServices;
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use Wikimedia\Rdbms\IDatabase;
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/**
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* Database mapper for EchoNotification model
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*/
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class EchoNotificationMapper extends EchoAbstractMapper {
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/**
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* Insert a notification record
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* @param EchoNotification $notification
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*/
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public function insert( EchoNotification $notification ) {
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$dbw = $this->dbFactory->getEchoDb( DB_PRIMARY );
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$listeners = $this->getMethodListeners( __FUNCTION__ );
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$row = $notification->toDbArray();
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DeferredUpdates::addUpdate( new AtomicSectionUpdate(
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$dbw,
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__METHOD__,
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static function ( IDatabase $dbw, $fname ) use ( $row, $listeners ) {
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$row['notification_timestamp'] =
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$dbw->timestamp( $row['notification_timestamp'] );
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$dbw->insert( 'echo_notification', $row, $fname );
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foreach ( $listeners as $listener ) {
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$dbw->onTransactionCommitOrIdle( $listener, $fname );
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}
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}
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) );
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}
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/**
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* Extract the offset used for notification list
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* @param string|null $continue String Used for offset
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* @throws MWException
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* @return int[]
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*/
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protected function extractQueryOffset( $continue ) {
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$offset = [
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'timestamp' => 0,
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'offset' => 0,
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];
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if ( $continue ) {
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$values = explode( '|', $continue, 3 );
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if ( count( $values ) !== 2 ) {
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throw new MWException( 'Invalid continue param: ' . $continue );
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}
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$offset['timestamp'] = (int)$values[0];
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$offset['offset'] = (int)$values[1];
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}
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return $offset;
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}
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/**
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* Get unread notifications by user in the amount specified by limit order by
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* notification timestamp in descending order. We have an index to retrieve
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* unread notifications but it's not optimized for ordering by timestamp. The
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* descending order is only allowed if we keep the notification in low volume,
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* which is done via a deleteJob
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* @param User $user
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* @param int $limit
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* @param string|null $continue Used for offset
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* @param string[] $eventTypes
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* @param Title[]|null $titles If set, only return notifications for these pages.
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* To find notifications not associated with any page, add null as an element to this array.
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* @param int $dbSource Use master or replica database
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* @return EchoNotification[]
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*/
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public function fetchUnreadByUser(
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User $user,
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$limit,
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$continue,
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array $eventTypes = [],
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array $titles = null,
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$dbSource = DB_REPLICA
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) {
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$conds = [ 'notification_read_timestamp' => null ];
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if ( $titles ) {
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$conds['event_page_id'] = $this->getIdsForTitles( $titles );
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if ( !$conds['event_page_id'] ) {
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return [];
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}
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}
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return $this->fetchByUserInternal( $user, $limit, $continue, $eventTypes, $conds, $dbSource );
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}
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/**
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* Get read notifications by user in the amount specified by limit order by
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* notification timestamp in descending order. We have an index to retrieve
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* unread notifications but it's not optimized for ordering by timestamp. The
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* descending order is only allowed if we keep the notification in low volume,
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* which is done via a deleteJob
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* @param User $user
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* @param int $limit
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* @param string|null $continue Used for offset
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* @param string[] $eventTypes
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* @param Title[]|null $titles If set, only return notifications for these pages.
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* To find notifications not associated with any page, add null as an element to this array.
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* @param int $dbSource Use master or replica database
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* @return EchoNotification[]
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*/
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public function fetchReadByUser(
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User $user,
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$limit,
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$continue,
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array $eventTypes = [],
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array $titles = null,
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$dbSource = DB_REPLICA
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) {
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$conds = [ 'notification_read_timestamp IS NOT NULL' ];
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if ( $titles ) {
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$conds['event_page_id'] = $this->getIdsForTitles( $titles );
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if ( !$conds['event_page_id'] ) {
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return [];
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}
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}
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return $this->fetchByUserInternal( $user, $limit, $continue, $eventTypes, $conds, $dbSource );
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}
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/**
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* Get Notification by user in batch along with limit, offset etc
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*
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* @param User $user the user to get notifications for
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* @param int $limit The maximum number of notifications to return
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* @param string|null $continue Used for offset
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* @param array $eventTypes Event types to load
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* @param array $excludeEventIds Event id's to exclude.
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* @param Title[]|null $titles If set, only return notifications for these pages.
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* To find notifications not associated with any page, add null as an element to this array.
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* @return EchoNotification[]
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*/
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public function fetchByUser(
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User $user,
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$limit,
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$continue,
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array $eventTypes = [],
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array $excludeEventIds = [],
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array $titles = null
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) {
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$dbr = $this->dbFactory->getEchoDb( DB_REPLICA );
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$conds = [];
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if ( $excludeEventIds ) {
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$conds[] = 'event_id NOT IN ( ' . $dbr->makeList( $excludeEventIds ) . ' ) ';
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}
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if ( $titles ) {
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$conds['event_page_id'] = $this->getIdsForTitles( $titles );
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if ( !$conds['event_page_id'] ) {
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return [];
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}
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}
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return $this->fetchByUserInternal( $user, $limit, $continue, $eventTypes, $conds );
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}
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protected function getIdsForTitles( array $titles ) {
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$ids = [];
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foreach ( $titles as $title ) {
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if ( $title === null ) {
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$ids[] = null;
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} elseif ( $title->exists() ) {
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$ids[] = $title->getArticleId();
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}
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}
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return $ids;
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}
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/**
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* @param User $user the user to get notifications for
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* @param int $limit The maximum number of notifications to return
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* @param string|null $continue Used for offset
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* @param array $eventTypes Event types to load
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* @param array $conds Additional query conditions.
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* @param int $dbSource Use master or replica database
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* @return EchoNotification[]
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*/
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protected function fetchByUserInternal(
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User $user,
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$limit,
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$continue,
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array $eventTypes = [],
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array $conds = [],
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$dbSource = DB_REPLICA
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) {
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$dbr = $this->dbFactory->getEchoDb( $dbSource );
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if ( !$eventTypes ) {
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return [];
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}
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// There is a problem with querying by event type, if a user has only one or none
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// flow notification and huge amount other notifications, the lookup of only flow
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// notification will result in a slow query. Luckily users won't have that many
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// notifications. We should have some cron job to remove old notifications so
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// the notification volume is in a reasonable amount for such case. The other option
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// is to denormalize notification table with event_type and lookup index.
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$conds = [
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'notification_user' => $user->getId(),
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'event_type' => $eventTypes,
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'event_deleted' => 0,
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] + $conds;
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$offset = $this->extractQueryOffset( $continue );
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// Start points are specified
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if ( $offset['timestamp'] && $offset['offset'] ) {
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$ts = $dbr->addQuotes( $dbr->timestamp( $offset['timestamp'] ) );
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// The offset and timestamp are those of the first notification we want to return
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$conds[] = "notification_timestamp < $ts OR " .
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"( notification_timestamp = $ts AND notification_event <= " . $offset['offset'] . " )";
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}
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$res = $dbr->select(
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[ 'echo_notification', 'echo_event' ],
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EchoNotification::selectFields(),
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$conds,
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__METHOD__,
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[
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'ORDER BY' => 'notification_timestamp DESC, notification_event DESC',
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'LIMIT' => $limit,
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],
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[
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'echo_event' => [ 'LEFT JOIN', 'notification_event=event_id' ],
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]
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);
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// query failure of some sort
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if ( !$res ) {
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return [];
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}
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/** @var EchoNotification[] $allNotifications */
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$allNotifications = [];
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foreach ( $res as $row ) {
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try {
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$notification = EchoNotification::newFromRow( $row );
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if ( $notification ) {
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$allNotifications[] = $notification;
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}
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} catch ( Exception $e ) {
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$id = $row->event_id ?? 'unknown event';
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wfDebugLog( 'Echo', __METHOD__ . ": Failed initializing event: $id" );
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MWExceptionHandler::logException( $e );
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}
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}
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$data = [];
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foreach ( $allNotifications as $notification ) {
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$data[ $notification->getEvent()->getId() ] = $notification;
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}
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return $data;
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}
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/**
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* Fetch EchoNotifications by user and event IDs.
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*
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* @param User $user
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* @param int[] $eventIds
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* @return EchoNotification[]|false
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*/
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public function fetchByUserEvents( User $user, array $eventIds ) {
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$dbr = $this->dbFactory->getEchoDb( DB_REPLICA );
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$result = $dbr->select(
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[ 'echo_notification', 'echo_event' ],
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EchoNotification::selectFields(),
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[
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'notification_user' => $user->getId(),
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'notification_event' => $eventIds
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],
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__METHOD__,
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[],
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[
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'echo_event' => [ 'INNER JOIN', 'notification_event=event_id' ],
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]
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);
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if ( $result ) {
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$notifications = [];
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foreach ( $result as $row ) {
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$notifications[] = EchoNotification::newFromRow( $row );
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}
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return $notifications;
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} else {
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return false;
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}
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}
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/**
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* Fetch a notification by user in the specified offset. The caller should
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* know that passing a big number for offset is NOT going to work
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* @param User $user
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* @param int $offset
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* @return EchoNotification|false
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*/
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public function fetchByUserOffset( User $user, $offset ) {
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$dbr = $this->dbFactory->getEchoDb( DB_REPLICA );
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$row = $dbr->selectRow(
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[ 'echo_notification', 'echo_event' ],
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EchoNotification::selectFields(),
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[
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'notification_user' => $user->getId(),
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'event_deleted' => 0,
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],
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__METHOD__,
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[
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'ORDER BY' => 'notification_timestamp DESC, notification_event DESC',
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'OFFSET' => $offset,
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'LIMIT' => 1
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],
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[
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'echo_event' => [ 'LEFT JOIN', 'notification_event=event_id' ],
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]
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);
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if ( $row ) {
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return EchoNotification::newFromRow( $row );
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} else {
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return false;
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}
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}
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/**
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* Batch delete notifications by user and eventId offset
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* @param User $user
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* @param int $eventId
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* @return bool
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*/
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public function deleteByUserEventOffset( User $user, $eventId ) {
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global $wgUpdateRowsPerQuery;
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$eventMapper = new EchoEventMapper( $this->dbFactory );
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$userId = $user->getId();
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$dbw = $this->dbFactory->getEchoDb( DB_PRIMARY );
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$dbr = $this->dbFactory->getEchoDb( DB_REPLICA );
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$lbFactory = MediaWikiServices::getInstance()->getDBLoadBalancerFactory();
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$ticket = $lbFactory->getEmptyTransactionTicket( __METHOD__ );
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$domainId = $dbw->getDomainID();
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$iterator = new BatchRowIterator(
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$dbr,
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'echo_notification',
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'notification_event',
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$wgUpdateRowsPerQuery
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);
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$iterator->addConditions( [
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'notification_user' => $userId,
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'notification_event < ' . (int)$eventId
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] );
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$iterator->setCaller( __METHOD__ );
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foreach ( $iterator as $batch ) {
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$eventIds = [];
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foreach ( $batch as $row ) {
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$eventIds[] = $row->notification_event;
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}
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$dbw->delete(
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'echo_notification',
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[
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'notification_user' => $userId,
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'notification_event' => $eventIds,
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],
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__METHOD__
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);
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// Find out which events are now orphaned, i.e. no longer referenced in echo_notifications
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// (besides the rows we just deleted) or in echo_email_batch, and delete them
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$eventMapper->deleteOrphanedEvents( $eventIds, $userId, 'echo_notification' );
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$lbFactory->commitAndWaitForReplication(
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__METHOD__, $ticket, [ 'domain' => $domainId ] );
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}
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return true;
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}
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/**
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* Fetch ids of users that have notifications for certain events
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*
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* @param int[] $eventIds
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* @return int[]|false
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*/
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public function fetchUsersWithNotificationsForEvents( array $eventIds ) {
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$dbr = $this->dbFactory->getEchoDb( DB_REPLICA );
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$res = $dbr->select(
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[ 'echo_notification' ],
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[ 'userId' => 'DISTINCT notification_user' ],
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[
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'notification_event' => $eventIds
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],
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__METHOD__
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);
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if ( $res ) {
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$userIds = [];
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foreach ( $res as $row ) {
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$userIds[] = $row->userId;
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}
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return $userIds;
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} else {
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return false;
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}
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}
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}
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