Make it possible to broadcast events to (web) clients

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

core/Command/Broadcast/Test.php

@@ -0,0 +1,100 @@
+<?php declare(strict_types=1);
+
+/**
+ * @copyright 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @author 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @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/>.
+ *
+ */
+
+namespace OC\Core\Command\Broadcast;
+
+use OCP\EventDispatcher\ABroadcastedEvent;
+use OCP\EventDispatcher\IEventDispatcher;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class Test extends Command {
+
+ /** @var IEventDispatcher */
+ private $eventDispatcher;
+
+ public function __construct(IEventDispatcher $eventDispatcher) {
+ parent::__construct();
+ $this->eventDispatcher = $eventDispatcher;
+ }
+
+ protected function configure(): void {
+ $this
+ ->setName('broadcast:test')
+ ->setDescription('test the SSE broadcaster')
+ ->addArgument(
+ 'uid',
+ InputArgument::REQUIRED,
+ 'the UID of the users to receive the event'
+ )
+ ->addArgument(
+ 'name',
+ InputArgument::OPTIONAL,
+ 'the event name',
+ 'test'
+ );
+ }
+
+ protected function execute(InputInterface $input, OutputInterface $output) {
+ $name = $input->getArgument('name');
+ $uid = $input->getArgument('uid');
+
+ $event = new class($name, $uid) extends ABroadcastedEvent {
+ /** @var string */
+ private $name;
+ /** @var string */
+ private $uid;
+
+ public function __construct(string $name,
+ string $uid) {
+ parent::__construct();
+ $this->name = $name;
+ $this->uid = $uid;
+ }
+
+ public function broadcastAs(): string {
+ return $this->name;
+ }
+
+ public function getUids(): array {
+ return [
+ $this->uid,
+ ];
+ }
+
+ public function jsonSerialize() {
+ return [
+ 'description' => 'this is a test event',
+ ];
+ }
+ };
+
+ $this->eventDispatcher->dispatch('broadcasttest', $event);
+
+ return 0;
+ }
+
+}

core/register_command.php

@@ -78,6 +78,8 @@
  $application->add(new OC\Core\Command\Background\WebCron(\OC::$server->getConfig()));
  $application->add(new OC\Core\Command\Background\Ajax(\OC::$server->getConfig()));
 
+ $application->add(\OC::$server->query(\OC\Core\Command\Broadcast\Test::class));
+
  $application->add(new OC\Core\Command\Config\App\DeleteConfig(\OC::$server->getConfig()));
  $application->add(new OC\Core\Command\Config\App\GetConfig(\OC::$server->getConfig()));
  $application->add(new OC\Core\Command\Config\App\SetConfig(\OC::$server->getConfig()));

lib/private/Broadcast/Events/BroadcastEvent.php

@@ -0,0 +1,59 @@
+<?php declare(strict_types=1);
+
+/**
+ * @copyright 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @author 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @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/>.
+ *
+ */
+
+namespace OC\Broadcast\Events;
+
+use JsonSerializable;
+use OCP\Broadcast\Events\IBroadcastEvent;
+use OCP\EventDispatcher\ABroadcastedEvent;
+use OCP\EventDispatcher\Event;
+
+class BroadcastEvent extends Event implements IBroadcastEvent {
+
+ /** @var ABroadcastedEvent */
+ private $event;
+
+ public function __construct(ABroadcastedEvent $event) {
+ parent::__construct();
+
+ $this->event = $event;
+ }
+
+ public function getName(): string {
+ return $this->event->broadcastAs();
+ }
+
+ public function getUids(): array {
+ return $this->event->getUids();
+ }
+
+ public function getPayload(): JsonSerializable {
+ return $this->event;
+ }
+
+ public function setBroadcasted(): void {
+ $this->event->setBroadcasted();
+ }
+
+}

lib/private/EventDispatcher/EventDispatcher.php

@@ -25,7 +25,10 @@
 
 namespace OC\EventDispatcher;
 
+use OC\Broadcast\Events\BroadcastEvent;
+use OCP\Broadcast\Events\IBroadcastEvent;
 use OCP\EventDispatcher\Event;
+use OCP\EventDispatcher\ABroadcastedEvent;
 use OCP\EventDispatcher\IEventDispatcher;
 use OCP\IContainer;
 use OCP\ILogger;
@@ -73,6 +76,14 @@ public function addServiceListener(string $eventName,
  public function dispatch(string $eventName,
  Event $event): void {
  $this->dispatcher->dispatch($event, $eventName);
+
+ if ($event instanceof ABroadcastedEvent && !$event->isPropagationStopped()) {
+ // Propagate broadcast
+ $this->dispatch(
+ IBroadcastEvent::class,
+ new BroadcastEvent($event)
+ );
+ }
  }
 
  public function dispatchTyped(Event $event): void {

lib/public/Broadcast/Events/IBroadcastEvent.php

@@ -0,0 +1,57 @@
+<?php declare(strict_types=1);
+
+/**
+ * @copyright 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @author 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @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/>.
+ *
+ */
+
+namespace OCP\Broadcast\Events;
+
+use JsonSerializable;
+
+/**
+ * @since 18.0.0
+ */
+interface IBroadcastEvent {
+
+ /**
+ * @return string the name of the event
+ * @since 18.0.0
+ */
+ public function getName(): string;
+
+ /**
+ * @return string[]
+ * @since 18.0.0
+ */
+ public function getUids(): array;
+
+ /**
+ * @return JsonSerializable the data to be sent to the client
+ * @since 18.0.0
+ */
+ public function getPayload(): JsonSerializable;
+
+ /**
+ * @since 18.0.0
+ */
+ public function setBroadcasted(): void;
+
+}

lib/public/EventDispatcher/ABroadcastedEvent.php

@@ -0,0 +1,71 @@
+<?php declare(strict_types=1);
+
+/**
+ * @copyright 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @author 2019 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @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/>.
+ *
+ */
+
+namespace OCP\EventDispatcher;
+
+use JsonSerializable;
+
+/**
+ * @since 18.0.0
+ */
+abstract class ABroadcastedEvent extends Event implements JsonSerializable {
+
+ /**
+ * @since 18.0.0
+ */
+ private $broadcasted = false;
+
+ /**
+ * Get the name of the event, as received on the client-side
+ *
+ * Uses the fully qualified event class name by default
+ *
+ * @return string
+ * @since 18.0.0
+ */
+ public function broadcastAs(): string {
+ return get_class($this);
+ }
+
+ /**
+ * @return string[]
+ * @since 18.0.0
+ */
+ abstract public function getUids(): array;
+
+ /**
+ * @since 18.0.0
+ */
+ public function setBroadcasted(): void {
+ $this->broadcasted = true;
+ }
+
+ /**
+ * @since 18.0.0
+ */
+ public function isBroadcasted(): bool {
+ return $this->broadcasted;
+ }
+
+}