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<?php
declare(strict_types=1);
/**
* @copyright 2020 Christoph Wurst <christoph@winzerhof-wurst.at>
*
* @author 2020 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 OCA\Mail\Listener;
use Generator;
use OCA\Mail\Db\MessageMapper;
use OCA\Mail\Events\SynchronizationEvent;
use OCA\Mail\IMAP\Threading\Container;
use OCA\Mail\IMAP\Threading\DatabaseMessage;
use OCA\Mail\IMAP\Threading\ThreadBuilder;
use OCP\EventDispatcher\Event;
use OCP\EventDispatcher\IEventListener;
use function array_chunk;
use function iterator_to_array;
class AccountSynchronizedThreadUpdaterListener implements IEventListener {
private const WRITE_IDS_CHUNK_SIZE = 500;
/** @var MessageMapper */
private $mapper;
/** @var ThreadBuilder */
private $builder;
public function __construct(MessageMapper $mapper,
ThreadBuilder $builder) {
$this->mapper = $mapper;
$this->builder = $builder;
}
public function handle(Event $event): void {
if (!($event instanceof SynchronizationEvent)) {
// Unrelated
return;
}
$accountId = $event->getAccount()->getId();
$logger = $event->getLogger();
$messages = $this->mapper->findThreadingData($event->getAccount());
$logger->debug("Account $accountId has " . count($messages) . " messages for threading");
$threads = $this->builder->build($messages, $logger);
$logger->debug("Account $accountId has " . count($threads) . " threads");
/** @var DatabaseMessage[] $flattened */
$flattened = iterator_to_array($this->flattenThreads($threads), false);
$logger->debug("Account $accountId has " . count($flattened) . " messages with a new thread IDs");
foreach (array_chunk($flattened, self::WRITE_IDS_CHUNK_SIZE) as $chunk) {
$this->mapper->writeThreadIds($chunk);
$logger->debug("Chunk of " . self::WRITE_IDS_CHUNK_SIZE . " messages updated");
}
}
/**
* @param Container[] $threads
*
* @return Generator
* @psalm-return Generator<int, DatabaseMessage>
*/
private function flattenThreads(array $threads,
?string $threadId = null): Generator {
foreach ($threads as $thread) {
if (($message = $thread->getMessage()) !== null) {
/** @var DatabaseMessage $message */
if ($threadId === null) {
// No parent -> let's use own ID
$message->setThreadRootId($message->getId());
} else {
$message->setThreadRootId($threadId);
}
if ($message->isDirty()) {
yield $message;
}
}
yield from $this->flattenThreads(
$thread->getChildren(),
$threadId ?? ($message === null ? null : $message->getId())
);
}
}
}
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