cache the verification of the share mountpoint

after the initial verification this can only really be invalidated by a system mount (external/group/etc) being created at the share target since any normal file/folder creation will already conflict with the share

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

apps/files_sharing/lib/MountProvider.php

@@ -34,6 +34,7 @@ use OCA\Files_Sharing\Event\ShareMountedEvent;
 use OCP\EventDispatcher\IEventDispatcher;
 use OCP\Files\Config\IMountProvider;
 use OCP\Files\Storage\IStorageFactory;
+use OCP\ICacheFactory;
 use OCP\IConfig;
 use OCP\ILogger;
 use OCP\IUser;
@@ -59,6 +60,9 @@ class MountProvider implements IMountProvider {
 	/** @var IEventDispatcher */
 	protected $eventDispatcher;
 
+	/** @var ICacheFactory */
+	protected $cacheFactory;
+
 	/**
 	 * @param \OCP\IConfig $config
 	 * @param IManager $shareManager
@@ -68,12 +72,14 @@ class MountProvider implements IMountProvider {
 		IConfig $config,
 		IManager $shareManager,
 		ILogger $logger,
-		IEventDispatcher $eventDispatcher
+		IEventDispatcher $eventDispatcher,
+		ICacheFactory $cacheFactory
 	) {
 		$this->config = $config;
 		$this->shareManager = $shareManager;
 		$this->logger = $logger;
 		$this->eventDispatcher = $eventDispatcher;
+		$this->cacheFactory = $cacheFactory;
 	}
 
 
@@ -136,7 +142,8 @@ class MountProvider implements IMountProvider {
 					$view,
 					$foldersExistCache,
 					$this->eventDispatcher,
-					$user
+					$user,
+					$this->cacheFactory->createLocal('share-valid-mountpoint')
 				);
 
 				$event = new ShareMountedEvent($mount);

apps/files_sharing/lib/SharedMount.php

@@ -26,6 +26,7 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>
  *
  */
+
 namespace OCA\Files_Sharing;
 
 use OC\Cache\CappedMemoryCache;
@@ -36,6 +37,7 @@ use OC\Files\View;
 use OCP\EventDispatcher\IEventDispatcher;
 use OCP\Files\Events\InvalidateMountCacheEvent;
 use OCP\Files\Storage\IStorageFactory;
+use OCP\ICache;
 use OCP\IUser;
 use OCP\Share\Events\VerifyMountPointEvent;
 
@@ -63,6 +65,8 @@ class SharedMount extends MountPoint implements MoveableMount {
 
 	private IEventDispatcher $eventDispatcher;
 
+	private ICache $cache;
+
 	public function __construct(
 		$storage,
 		array $mountpoints,
@@ -71,11 +75,13 @@ class SharedMount extends MountPoint implements MoveableMount {
 		View $recipientView,
 		CappedMemoryCache $folderExistCache,
 		IEventDispatcher $eventDispatcher,
-		IUser $user
+		IUser $user,
+		ICache $cache
 	) {
 		$this->user = $user;
 		$this->recipientView = $recipientView;
 		$this->eventDispatcher = $eventDispatcher;
+		$this->cache = $cache;
 
 		$this->superShare = $arguments['superShare'];
 		$this->groupedShares = $arguments['groupedShares'];
@@ -92,7 +98,17 @@ class SharedMount extends MountPoint implements MoveableMount {
 	 * @param SharedMount[] $mountpoints
 	 * @return string
 	 */
-	private function verifyMountPoint(\OCP\Share\IShare $share, array $mountpoints, CappedMemoryCache $folderExistCache) {
+	private function verifyMountPoint(
+		\OCP\Share\IShare $share,
+		array $mountpoints,
+		CappedMemoryCache $folderExistCache
+	) {
+		$cacheKey = $this->user->getUID() . '/' . $share->getTarget();
+		$cached = $this->cache->get($cacheKey);
+		if ($cached !== null) {
+			return $cached;
+		}
+
 		$mountPoint = basename($share->getTarget());
 		$parent = dirname($share->getTarget());
 
@@ -120,6 +136,8 @@ class SharedMount extends MountPoint implements MoveableMount {
 			$this->updateFileTarget($newMountPoint, $share);
 		}
 
+		$this->cache->set($cacheKey, $newMountPoint, 60 * 60);
+
 		return $newMountPoint;
 	}
 

apps/files_sharing/tests/MountProviderTest.php

@@ -29,10 +29,12 @@
  */
 namespace OCA\Files_Sharing\Tests;
 
+use OC\Memcache\NullCache;
 use OCA\Files_Sharing\MountProvider;
 use OCP\EventDispatcher\IEventDispatcher;
 use OCP\Files\IRootFolder;
 use OCP\Files\Storage\IStorageFactory;
+use OCP\ICacheFactory;
 use OCP\IConfig;
 use OCP\ILogger;
 use OCP\IUser;
@@ -72,8 +74,11 @@ class MountProviderTest extends \Test\TestCase {
 		$this->shareManager = $this->getMockBuilder(IManager::class)->getMock();
 		$this->logger = $this->getMockBuilder(ILogger::class)->getMock();
 		$eventDispatcher = $this->createMock(IEventDispatcher::class);
+		$cacheFactory = $this->createMock(ICacheFactory::class);
+		$cacheFactory->method('createLocal')
+			->willReturn(new NullCache());
 
-		$this->provider = new MountProvider($this->config, $this->shareManager, $this->logger, $eventDispatcher);
+		$this->provider = new MountProvider($this->config, $this->shareManager, $this->logger, $eventDispatcher, $cacheFactory);
 	}
 
 	private function makeMockShare($id, $nodeId, $owner = 'user2', $target = null, $permissions = 31) {