multiple minor fies

lib/private/files/config/mountprovidercollection.php

@@ -93,11 +93,13 @@ class MountProviderCollection implements IMountProviderCollection, Emitter {
 	 * @param IUser $user
 	 * @param IMountPoint[] $mountPoints
 	 */
-	public function cacheMounts(IUser $user, array $mountPoints) {
+	public function registerMounts(IUser $user, array $mountPoints) {
 		$this->mountCache->registerMounts($user, $mountPoints);
 	}
 
 	/**
+	 * Get the mount cache which can be used to search for mounts without setting up the filesystem
+	 *
 	 * @return IUserMountCache
 	 */
 	public function getMountCache() {

lib/private/files/config/usermountcache.php

@@ -31,6 +31,9 @@ use OCP\ILogger;
 use OCP\IUser;
 use OCP\IUserManager;
 
+/**
+ * Cache mounts points per user in the cache so we can easilly look them up
+ */
 class UserMountCache implements IUserMountCache {
 	/**
 	 * @var IDBConnection
@@ -64,15 +67,16 @@ class UserMountCache implements IUserMountCache {
 	}
 
 	public function registerMounts(IUser $user, array $mounts) {
+		// filter out non-proper storages coming from unit tests
 		$mounts = array_filter($mounts, function (IMountPoint $mount) {
 			return $mount->getStorage()->getCache();
 		});
-		$mounts = array_values($mounts);
 		/** @var ICachedMountInfo[] $newMounts */
 		$newMounts = array_map(function (IMountPoint $mount) use ($user) {
 			$storage = $mount->getStorage();
 			$rootId = (int)$storage->getCache()->getId('');
 			$storageId = (int)$storage->getStorageCache()->getNumericId();
+			// filter out any storages which aren't scanned yet since we aren't interested in files from those storages (yet)
 			if ($rootId === -1) {
 				return null;
 			} else {
@@ -80,9 +84,10 @@ class UserMountCache implements IUserMountCache {
 			}
 		}, $mounts);
 		$newMounts = array_values(array_filter($newMounts));
-		$cachedMounts = $this->getMountsForUser($user);
 
+		$cachedMounts = $this->getMountsForUser($user);
 		$mountDiff = function (ICachedMountInfo $mount1, ICachedMountInfo $mount2) {
+			// since we are only looking for mounts for a specific user comparing on root id is enough
 			return $mount1->getRootId() - $mount2->getRootId();
 		};
 
@@ -97,7 +102,8 @@ class UserMountCache implements IUserMountCache {
 		}
 		foreach ($removedMounts as $mount) {
 			$this->removeFromCache($mount);
-			$this->mountsForUsers[$user->getUID()] = [];
+			$index = array_search($mount, $this->mountsForUsers[$user->getUID()]);
+			unset($this->mountsForUsers[$user->getUID()][$index]);
 		}
 	}
 
@@ -121,6 +127,8 @@ class UserMountCache implements IUserMountCache {
 			$query->execute();
 		} catch (UniqueConstraintViolationException $e) {
 			// seems to mainly happen in tests
+			// can also happen during concurrent access but we can safely ignore it
+			// since inserting the same data twice will still result in the correct data being inserted
 			$this->logger->error('Duplicate entry while inserting mount');
 			$this->logger->logException($e);
 		}
@@ -145,6 +153,7 @@ class UserMountCache implements IUserMountCache {
 	 * @return ICachedMountInfo[]
 	 */
 	public function getMountsForUser(IUser $user) {
+		if (!isset($this->mountsForUsers[$user->getUID()])) {
 			$builder = $this->connection->getQueryBuilder();
 			$query = $builder->select('storage_id', 'root_id', 'user_id', 'mount_point')
 				->from('mounts')
@@ -152,7 +161,9 @@ class UserMountCache implements IUserMountCache {
 
 			$rows = $query->execute()->fetchAll();
 
-		return array_map([$this, 'dbRowToMountInfo'], $rows);
+			$this->mountsForUsers[$user->getUID()] = array_map([$this, 'dbRowToMountInfo'], $rows);
+		}
+		return $this->mountsForUsers[$user->getUID()];
 	}
 
 	/**

lib/private/files/filesystem.php

@@ -428,7 +428,7 @@ class Filesystem {
 			$mounts = $mountConfigManager->getMountsForUser($userObject);
 			array_walk($mounts, array(self::$mounts, 'addMount'));
 			$mounts[] = $mount;
-			$mountConfigManager->cacheMounts($userObject, $mounts);
+			$mountConfigManager->registerMounts($userObject, $mounts);
 		}
 
 		self::listenForNewMountProviders($mountConfigManager, $userManager);

lib/public/files/config/icachedmountinfo.php

@@ -25,6 +25,8 @@ use OCP\Files\Node;
 use OCP\IUser;
 
 /**
+ * Holds information about a mount for a user
+ *
  * @since 9.0.0
  */
 interface ICachedMountInfo {

lib/public/files/config/imountprovidercollection.php

@@ -46,4 +46,12 @@ interface IMountProviderCollection {
 	 * @since 8.0.0
 	 */
 	public function registerProvider(IMountProvider $provider);
+
+	/**
+	 * Get the mount cache which can be used to search for mounts without setting up the filesystem
+	 *
+	 * @return IUserMountCache
+	 * @since 9.0.0
+	 */
+	public function getMountCache();
 }

lib/public/files/config/iusermountcache.php

@@ -25,6 +25,8 @@ use OCP\Files\Mount\IMountPoint;
 use OCP\IUser;
 
 /**
+ * Cache mounts points per user in the cache so we can easily look them up
+ *
  * @since 9.0.0
  */
 interface IUserMountCache {

tests/lib/files/config/usermountcache.php

@@ -18,16 +18,6 @@ use OCP\IUserManager;
 use Test\TestCase;
 use Test\Util\User\Dummy;
 
-class NullLogger extends Log {
-	public function __construct($logger = null) {
-		//disable original constructor
-	}
-
-	public function log($level, $message, array $context = array()) {
-		//noop
-	}
-}
-
 /**
  * @group DB
  */
@@ -54,7 +44,7 @@ class UserMountCache extends TestCase {
 		$userBackend->createUser('u1', '');
 		$userBackend->createUser('u2', '');
 		$this->userManager->registerBackend($userBackend);
-		$this->cache = new \OC\Files\Config\UserMountCache($this->connection, $this->userManager, new NullLogger());
+		$this->cache = new \OC\Files\Config\UserMountCache($this->connection, $this->userManager, $this->getMock('\OC\Log'));
 	}
 
 	public function tearDown() {