test: add some minimal testing for metadata storage

Signed-off-by: Robin Appelman <robin@icewind.nl>

lib/private/FilesMetadata/FilesMetadataManager.php

@@ -81,10 +81,10 @@ class FilesMetadataManager implements IFilesMetadataManager {
 		try {
 			/** @var FilesMetadata $metadata */
 			$metadata = $this->metadataRequestService->getMetadataFromFileId($node->getId());
-			$metadata->setStorageId($storageId);
 		} catch (FilesMetadataNotFoundException) {
-			$metadata = new FilesMetadata($node->getId(), $storageId);
+			$metadata = new FilesMetadata($node->getId());
 		}
+		$metadata->setStorageId($storageId);
 
 		// if $process is LIVE, we enforce LIVE
 		// if $process is NAMED, we go NAMED

lib/private/FilesMetadata/Model/FilesMetadata.php

@@ -27,10 +27,10 @@ class FilesMetadata implements IFilesMetadata {
 	private bool $updated = false;
 	private int $lastUpdate = 0;
 	private string $syncToken = '';
+	private ?int $storageId = null;
 
 	public function __construct(
 		private int $fileId = 0,
-		private ?int $storageId = null,
 	) {
 	}
 
@@ -47,6 +47,14 @@ class FilesMetadata implements IFilesMetadata {
 		return $this->storageId;
 	}
 
+	/**
+	 * Set which storage the file this metadata belongs to.
+	 *
+	 * This helps with sharded filecache setups to know where to store the metadata
+	 *
+	 * @param int $storageId
+	 * @return void
+	 */
 	public function setStorageId(int $storageId): void {
 		$this->storageId = $storageId;
 	}

lib/private/FilesMetadata/Service/MetadataRequestService.php

@@ -29,8 +29,11 @@ class MetadataRequestService {
 	}
 
 	private function getStorageId(IFilesMetadata $filesMetadata): int {
-		if ($filesMetadata instanceof FilesMetadata && $filesMetadata->getStorageId()) {
-			return $filesMetadata->getStorageId();
+		if ($filesMetadata instanceof FilesMetadata) {
+			$storage = $filesMetadata->getStorageId();
+			if ($storage) {
+				return $storage;
+			}
 		}
 		// all code paths that lead to saving metadata *should* have the storage id set
 		// this fallback is there just in case

tests/lib/FilesMetadata/FilesMetadataManagerTest.php

@@ -0,0 +1,98 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * SPDX-FileCopyrightText: 2024 Robin Appelman <robin@icewind.nl>
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace Test\FilesMetadata;
+
+use OC\BackgroundJob\JobList;
+use OC\Files\Storage\Temporary;
+use OC\FilesMetadata\FilesMetadataManager;
+use OC\FilesMetadata\Service\IndexRequestService;
+use OC\FilesMetadata\Service\MetadataRequestService;
+use OCP\EventDispatcher\Event;
+use OCP\EventDispatcher\IEventDispatcher;
+use OCP\Files\Folder;
+use OCP\Files\IRootFolder;
+use OCP\FilesMetadata\AMetadataEvent;
+use OCP\IAppConfig;
+use OCP\IDBConnection;
+use OCP\Server;
+use Psr\Log\LoggerInterface;
+use Test\TestCase;
+use Test\Traits\MountProviderTrait;
+use Test\Traits\UserTrait;
+
+/**
+ * @group DB
+ */
+class FilesMetadataManagerTest extends TestCase {
+	use UserTrait;
+	use MountProviderTrait;
+
+	private IEventDispatcher $eventDispatcher;
+	private JobList $jobList;
+	private IAppConfig $appConfig;
+	private LoggerInterface $logger;
+	private MetadataRequestService $metadataRequestService;
+	private IndexRequestService $indexRequestService;
+	private FilesMetadataManager $manager;
+	private IDBConnection $connection;
+	private Folder $userFolder;
+	private array $metadata = [];
+
+	protected function setUp(): void {
+		parent::setUp();
+
+		$this->jobList = $this->createMock(JobList::class);
+		$this->eventDispatcher = $this->createMock(IEventDispatcher::class);
+		$this->eventDispatcher->method('dispatchTyped')->willReturnCallback(function (Event $event) {
+			if ($event instanceof AMetadataEvent) {
+				$name = $event->getNode()->getName();
+				if (isset($this->metadata[$name])) {
+					$meta = $event->getMetadata();
+					foreach ($this->metadata[$name] as $key => $value) {
+						$meta->setString($key, $value);
+					}
+				}
+			}
+		});
+		$this->appConfig = $this->createMock(IAppConfig::class);
+		$this->logger = $this->createMock(LoggerInterface::class);
+
+		$this->connection = Server::get(IDBConnection::class);
+		$this->metadataRequestService = new MetadataRequestService($this->connection, $this->logger);
+		$this->indexRequestService = new IndexRequestService($this->connection, $this->logger);
+		$this->manager = new FilesMetadataManager(
+			$this->eventDispatcher,
+			$this->jobList,
+			$this->appConfig,
+			$this->logger,
+			$this->metadataRequestService,
+			$this->indexRequestService,
+		);
+
+		$this->createUser('metatest', '');
+		$this->registerMount('metatest', new Temporary([]), '/metatest');
+
+		$rootFolder = Server::get(IRootFolder::class);
+		$this->userFolder = $rootFolder->getUserFolder('metatest');
+	}
+
+	public function testRefreshMetadata(): void {
+		$this->metadata['test.txt'] = [
+			'istest' => 'yes'
+		];
+		$file = $this->userFolder->newFile('test.txt', 'test');
+		$stored = $this->manager->refreshMetadata($file);
+		$this->assertEquals($file->getId(), $stored->getFileId());
+		$this->assertEquals('yes', $stored->getString('istest'));
+
+		$retrieved = $this->manager->getMetadata($file->getId());
+		$this->assertEquals($file->getId(), $retrieved->getFileId());
+		$this->assertEquals('yes', $retrieved->getString('istest'));
+	}
+}