enh(metadata): Introduce a memory limit for metadata generation

Signed-off-by: Git'Fellow <[email protected]>

core/BackgroundJobs/GenerateMetadataJob.php

@@ -37,6 +37,9 @@
 use Psr\Log\LoggerInterface;
 
 class GenerateMetadataJob extends TimedJob {
+	// Default memory limit for metadata generation (256 MBytes).
+	protected const DEFAULT_MEMORY_LIMIT = 256;
+
 	public function __construct(
 		ITimeFactory $time,
 		private IConfig $config,
@@ -100,6 +103,14 @@ private function scanFolder(Folder $folder): void {
 				continue;
 			}
 
+			// Don't generate metadata for files bigger than metadata_max_memory
+			$nodeSize = $node->getSize();
+			$memoryLimit = $this->config->getSystemValueInt('metadata_max_memory', self::DEFAULT_MEMORY_LIMIT);
+			if ($nodeSize > $memoryLimit) {
+				$this->logger->debug("Skipping generating metadata for fileid " . $node->getId() . " as its size exceeds configured 'metadata_max_memory'.");
+				continue;
+			}
+
 			try {
 				$this->filesMetadataManager->getMetadata($node->getId(), false);
 			} catch (FilesMetadataNotFoundException) {