1 files changed, 79 insertions, 0 deletions
diff --git a/lib/private/Files/ObjectStore/ObjectStoreScanner.php b/lib/private/Files/ObjectStore/ObjectStoreScanner.php
new file mode 100644
index 00000000000..5c3992b8458
--- /dev/null
+++ b/lib/private/Files/ObjectStore/ObjectStoreScanner.php
@@ -0,0 +1,79 @@
+<?php
+
+/**
+ * SPDX-FileCopyrightText: 2023 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+namespace OC\Files\ObjectStore;
+
+use OC\Files\Cache\Scanner;
+use OCP\DB\QueryBuilder\IQueryBuilder;
+use OCP\Files\FileInfo;
+
+class ObjectStoreScanner extends Scanner {
+	public function scanFile($file, $reuseExisting = 0, $parentId = -1, $cacheData = null, $lock = true, $data = null) {
+		return null;
+	}
+
+	public function scan($path, $recursive = self::SCAN_RECURSIVE, $reuse = -1, $lock = true) {
+		return null;
+	}
+
+	protected function scanChildren(string $path, $recursive, int $reuse, int $folderId, bool $lock, int|float $oldSize, &$etagChanged = false) {
+		return 0;
+	}
+
+	public function backgroundScan() {
+		$lastPath = null;
+		// find any path marked as unscanned and run the scanner until no more paths are unscanned (or we get stuck)
+		// we sort by path DESC to ensure that contents of a folder are handled before the parent folder
+		while (($path = $this->getIncomplete()) !== false && $path !== $lastPath) {
+			$this->runBackgroundScanJob(function () use ($path) {
+				$item = $this->cache->get($path);
+				if ($item && $item->getMimeType() !== FileInfo::MIMETYPE_FOLDER) {
+					$fh = $this->storage->fopen($path, 'r');
+					if ($fh) {
+						$stat = fstat($fh);
+						if ($stat['size']) {
+							$this->cache->update($item->getId(), ['size' => $stat['size']]);
+						}
+					}
+				}
+			}, $path);
+			// FIXME: this won't proceed with the next item, needs revamping of getIncomplete()
+			// to make this possible
+			$lastPath = $path;
+		}
+	}
+
+	/**
+	 * Unlike the default Cache::getIncomplete this one sorts by path.
+	 *
+	 * This is needed since self::backgroundScan doesn't fix child entries when running on a parent folder.
+	 * By sorting by path we ensure that we encounter the child entries first.
+	 *
+	 * @return false|string
+	 * @throws \OCP\DB\Exception
+	 */
+	private function getIncomplete() {
+		$query = $this->connection->getQueryBuilder();
+		$query->select('path')
+			->from('filecache')
+			->where($query->expr()->eq('storage', $query->createNamedParameter($this->cache->getNumericStorageId(), IQueryBuilder::PARAM_INT)))
+			->andWhere($query->expr()->eq('size', $query->createNamedParameter(-1, IQueryBuilder::PARAM_INT)))
+			->orderBy('path', 'DESC')
+			->setMaxResults(1);
+
+		$result = $query->executeQuery();
+		$path = $result->fetchOne();
+		$result->closeCursor();
+
+		if ($path === false) {
+			return false;
+		}
+
+		// Make sure Oracle does not continue with null for empty strings
+		return (string)$path;
+	}
+}