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<?php
declare( strict_types = 1 );
namespace MediaWiki\Extension\Translate\MessageGroupProcessing;
use EmptyIterator;
use Iterator;
use JobQueueGroup;
use MediaWiki\Config\ServiceOptions;
use MediaWiki\Extension\Notifications\Model\Event;
use MediaWiki\Title\Title;
use MediaWiki\User\User;
use MediaWiki\User\UserIdentity;
use MediaWiki\User\UserIdentityLookup;
use MessageGroup;
use Psr\Log\LoggerInterface;
use StatusValue;
/**
* Manage user subscriptions to message groups and trigger notifications
* @since 2024.04
* @license GPL-2.0-or-later
* @author Abijeet Patro
*/
class MessageGroupSubscription {
private MessageGroupSubscriptionStore $groupSubscriptionStore;
private JobQueueGroup $jobQueueGroup;
private bool $isMessageGroupSubscriptionEnabled;
private UserIdentityLookup $userIdentityLookup;
private array $queuedMessages = [];
private LoggerInterface $logger;
private ?MockEventCreator $mockEventCreator = null;
public const STATE_ADDED = 'added';
public const STATE_UPDATED = 'updated';
public const CONSTRUCTOR_OPTIONS = [ 'TranslateEnableMessageGroupSubscription' ];
public const NOT_ENABLED = 'mgs-not-enabled';
public const UNNAMED_USER_UNSUPPORTED = 'mgs-unnamed-user-unsupported';
public const DYNAMIC_GROUP_UNSUPPORTED = 'mgs-dynamic-group-unsupported';
public function __construct(
MessageGroupSubscriptionStore $groupSubscriptionStore,
JobQueueGroup $jobQueueGroup,
UserIdentityLookup $userIdentityLookup,
LoggerInterface $logger,
ServiceOptions $options
) {
$this->groupSubscriptionStore = $groupSubscriptionStore;
$this->jobQueueGroup = $jobQueueGroup;
$this->userIdentityLookup = $userIdentityLookup;
$this->logger = $logger;
$options->assertRequiredOptions( self::CONSTRUCTOR_OPTIONS );
$this->isMessageGroupSubscriptionEnabled = $options->get( 'TranslateEnableMessageGroupSubscription' );
}
public function isEnabled(): bool {
return $this->isMessageGroupSubscriptionEnabled;
}
public function subscribeToGroup( MessageGroup $group, User $user ): StatusValue {
$status = $this->canUserSubscribeToGroup( $group, $user );
if ( !$status->isOK() ) {
return $status;
}
$this->groupSubscriptionStore->addSubscription( $group->getId(), $user->getId() );
return StatusValue::newGood();
}
public function isUserSubscribedTo( MessageGroup $group, UserIdentity $user ): bool {
return $this->groupSubscriptionStore->getSubscriptions( [ $group->getId() ], $user->getId() )->count() !== 0;
}
public function unsubscribeFromGroup( MessageGroup $group, UserIdentity $user ): void {
$this->groupSubscriptionStore->removeSubscriptions( $group->getId(), $user->getId() );
}
public function unsubscribeFromGroupsById( array $groupIds, UserIdentity $user ): void {
$uniqueGroupIds = array_unique( $groupIds );
foreach ( $uniqueGroupIds as $groupId ) {
$this->groupSubscriptionStore->removeSubscriptions( $groupId, $user->getId() );
}
}
public function subscribeToGroupsById( array $groupIds, UserIdentity $user ): void {
$uniqueGroupIds = array_unique( $groupIds );
foreach ( $uniqueGroupIds as $groupId ) {
$this->groupSubscriptionStore->addSubscription( $groupId, $user->getId() );
}
}
/** @return string[] */
public function getUserSubscriptions( UserIdentity $user ): array {
$subscriptions = [];
$result = $this->groupSubscriptionStore->getSubscriptions( null, $user->getId() );
foreach ( $result as $row ) {
$subscriptions[] = $row->tmgs_group;
}
return $subscriptions;
}
/**
* Queue a message / group to send notifications for
* @param Title $messageTitle
* @param string $state
* @return void
*/
public function queueMessage( Title $messageTitle, string $state, string $groupId ): void {
$this->queuedMessages[ $groupId ][ $state ][] = $messageTitle->getPrefixedDBkey();
}
public function queueNotificationJob(): void {
if ( !$this->isEnabled() || $this->queuedMessages === [] ) {
return;
}
$this->jobQueueGroup->push( MessageGroupSubscriptionNotificationJob::newJob( $this->queuedMessages ) );
$this->logger->debug(
'Queued job with changes for {countGroups} groups',
[ 'countGroups' => count( $this->queuedMessages ) ]
);
// Reset queued messages once job has been queued
$this->queuedMessages = [];
}
/**
* @param array<string,array<string,array<int,string>>> $changesToProcess
* Group ID → state → array of message prefixed DB keys map
*/
public function sendNotifications( array $changesToProcess ): void {
if ( !$this->isEnabled() || $changesToProcess === [] ) {
return;
}
$groupIdAggregateMapped = $this->getMappedAggregateGroupIds();
// List of changes to process along with aggregate groups.
$changesWithAggregateGroups = $changesToProcess;
$sourceGroupIdMap = [];
// Find aggregate groups which need to be notified.
foreach ( $changesToProcess as $groupId => $stateValues ) {
// Find the aggregate groups that the current group belongs to.
$aggregateGroupIds = $groupIdAggregateMapped[$groupId] ?? [];
if ( !$aggregateGroupIds ) {
continue;
}
foreach ( $aggregateGroupIds as $aggregateGroupId ) {
// The aggregate group might already be in the list of changes to process
$currentGroupState = $changesWithAggregateGroups[$aggregateGroupId] ??
$changesToProcess[$aggregateGroupId] ?? [];
$changesWithAggregateGroups[$aggregateGroupId] =
$this->appendToState( $currentGroupState, $stateValues );
// If an aggregate group is added to the list of changes directly, don't bother finding other
// groups that have this group as a parent and notify all subscribers; otherwise, add the source
// message group id due to which notification is being sent to this aggregate group.
if ( !isset( $changesToProcess[$aggregateGroupId] ) ) {
$sourceGroupIdMap[$aggregateGroupId][$groupId] = true;
}
}
}
$groupIdsToNotify = array_keys( $changesWithAggregateGroups );
$allGroupSubscribers = $this->getSubscriberIdsForGroups( $groupIdsToNotify );
// No subscribers found for the groups
if ( !$allGroupSubscribers ) {
$this->logger->info( 'No subscribers for groups.' );
return;
}
$groups = MessageGroups::getGroupsById( $groupIdsToNotify );
foreach ( $changesWithAggregateGroups as $groupId => $state ) {
$group = $groups[ $groupId ] ?? null;
if ( !$group ) {
$this->logger->debug(
'Group not found {groupId}.',
[ 'groupId' => $groupId ]
);
continue;
}
$groupSubscribers = $allGroupSubscribers[ $groupId ] ?? [];
if ( $groupSubscribers === [] ) {
$this->logger->info(
'No subscribers found for {groupId} group.',
[ 'groupId' => $groupId ]
);
continue;
}
$extraParams = [
'groupId' => $groupId,
'groupLabel' => $group->getLabel(),
'changes' => $state,
];
if ( isset( $sourceGroupIdMap[ $groupId ] ) ) {
$extraParams['sourceGroupIds'] = array_unique( array_keys( $sourceGroupIdMap[ $groupId ] ) );
}
if ( $this->mockEventCreator ) {
$this->mockEventCreator->create( [
'type' => 'translate-mgs-message-added',
'extra' => $extraParams
] );
} else {
Event::create( [
'type' => 'translate-mgs-message-added',
'extra' => $extraParams
] );
}
$this->logger->info(
'Event created for {groupId} with {subscriberCount} subscribers.',
[
'groupId' => $groupId,
'subscriberCount' => count( $groupSubscribers )
]
);
}
}
/**
* Given a group id returns an iterator to the subscribers of that group.
* Returns an EmptyIterator if there are no subscribers
* @return Iterator<UserIdentity>
*/
public function getGroupSubscribers( string $groupId ): Iterator {
$groupSubscriberIds = $this->getSubscriberIdsForGroups( [ $groupId ] );
$groupSubscriberIds = $groupSubscriberIds[ $groupId ] ?? [];
if ( $groupSubscriberIds === [] ) {
return new EmptyIterator();
}
return $this->userIdentityLookup->newSelectQueryBuilder()
->whereUserIds( $groupSubscriberIds )
->caller( __METHOD__ )
->fetchUserIdentities();
}
/**
* Return a list of users ids that belong to all the given groups
* @return int[]
*/
public function getGroupSubscriberUnion( array $groupIds ): array {
$unionGroups = $this->groupSubscriptionStore->getSubscriptionByGroupUnion( $groupIds );
$userList = [];
foreach ( $unionGroups as $row ) {
$userList[] = (int)$row;
}
return $userList;
}
public function setMockEventCreator( MockEventCreator $mockEventCreator ): void {
$this->mockEventCreator = $mockEventCreator;
}
/**
* Get all subscribers for groups. Returns an array where the keys are the
* group ids and value is a list of integer user ids
* @param string[] $groupIds
* @return array[] [(str) groupId => (int[]) userId, ...]
*/
private function getSubscriberIdsForGroups( array $groupIds ): array {
$dbGroupSubscriptions = $this->groupSubscriptionStore->getSubscriptions( $groupIds, null );
$groupSubscriptions = [];
foreach ( $dbGroupSubscriptions as $row ) {
$groupSubscriptions[ $row->tmgs_group ][] = (int)$row->tmgs_user_id;
}
return $groupSubscriptions;
}
public function canUserSubscribeToGroup( MessageGroup $group, User $user ): StatusValue {
if ( !$this->isEnabled() ) {
return StatusValue::newFatal( self::NOT_ENABLED );
}
if ( MessageGroups::isDynamic( $group ) ) {
return StatusValue::newFatal( self::DYNAMIC_GROUP_UNSUPPORTED );
}
if ( !$user->isNamed() ) {
return StatusValue::newFatal( self::UNNAMED_USER_UNSUPPORTED );
}
return StatusValue::newGood();
}
/**
* Returns a map of group id mapped to the aggregate groups that it belongs to.
* @return array<string, string[]>
*/
private function getMappedAggregateGroupIds(): array {
$groupStructure = MessageGroups::getGroupStructure();
// Flatten the group structure for easy indexing
$groupIdAggregateMapped = [];
foreach ( $groupStructure as $groupId => $mappedGroups ) {
if ( !is_array( $mappedGroups ) ) {
// We don't care about non-aggregate groups
continue;
}
// array_merge_recursive causes duplicates to appear in the mapped group ids, but that's
// alright, we can deduplicate them when we use the values.
$groupIdAggregateMapped = array_merge_recursive(
$groupIdAggregateMapped,
$this->mapGroups( $mappedGroups, $groupId )
);
}
return $groupIdAggregateMapped;
}
/** @return array<string, string[]> */
private function mapGroups( array $subGroupList, string $groupId ): array {
$groupIdAggregateMapped = [];
foreach ( $subGroupList as $subGroups ) {
if ( is_array( $subGroups ) && $subGroups ) {
// First group in the array is the aggregate group
$subGroupId = ( $subGroups[0] )->getId();
$groupIdAggregateMapped = $this->mapGroups( array_slice( $subGroups, 1 ), $subGroupId );
foreach ( array_keys( $groupIdAggregateMapped ) as $mappedGubGroupId ) {
$groupIdAggregateMapped[$mappedGubGroupId][] = $groupId;
}
$groupIdAggregateMapped[$subGroupId][] = $groupId;
} else {
$groupIdAggregateMapped[$subGroups->getId()][] = $groupId;
}
}
return $groupIdAggregateMapped;
}
private function appendToState( array $existingState, array $newState ): array {
foreach ( $newState as $stateType => $stateValues ) {
$existingState[$stateType] = array_unique(
array_merge( $existingState[$stateType] ?? [], $stateValues )
);
}
return $existingState;
}
}