dedicated Listener class, constants for events

Signed-off-by: chandi Langecker <git@chandi.it>

lib/Listeners/LiveUpdateListener.php

@@ -0,0 +1,73 @@
+<?php
+/*
+ * @copyright Copyright (c) 2021 Julius Härtl <jus@bitgrid.net>
+ *
+ * @author Julius Härtl <jus@bitgrid.net>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+declare(strict_types=1);
+
+
+namespace OCA\Deck\Listeners;
+
+use OCA\Deck\NotifyPushEvents;
+use OCA\Deck\Event\SessionClosedEvent;
+use OCA\Deck\Event\SessionCreatedEvent;
+use OCA\Deck\Service\SessionService;
+use OCA\NotifyPush\Queue\IQueue;
+use OCP\EventDispatcher\Event;
+use OCP\EventDispatcher\IEventListener;
+use Psr\Container\ContainerInterface;
+use Psr\Log\LoggerInterface;
+
+class LiveUpdateListener implements IEventListener {
+	private string $userId;
+	private LoggerInterface $logger;
+	private SessionService $sessionService;
+	private $queue;
+	
+	public function __construct(ContainerInterface $container, SessionService $sessionService, $userId) {
+		try {
+			$this->queue = $container->get(IQueue::class);
+		} catch (\Exception $e) {
+			// most likely notify_push is not installed.
+			return;
+		}
+		$this->userId = $userId;
+		$this->logger = $container->get(LoggerInterface::class);
+		$this->sessionService = $sessionService;
+	}
+
+	public function handle(Event $event): void {
+		if (!$this->queue) {
+			// notify_push is not active
+			return;
+		}
+
+		try {
+			if ($event instanceof SessionCreatedEvent || $event instanceof SessionClosedEvent) {
+				$this->sessionService->notifyAllSessions($this->queue, $event->getBoardId(), NotifyPushEvents::DeckBoardUpdate, $event->getUserId(), [
+					'id' => $event->getBoardId()
+				]);
+			}
+		} catch (\Exception $e) {
+			$this->logger->error('Error when handling live update event', ['exception' => $e]);
+		}
+	}
+}