ttl for memcache locking backends that support it

lib/private/lock/abstractlockingprovider.php

@@ -28,6 +28,8 @@ use OCP\Lock\ILockingProvider;
  * to release any left over locks at the end of the request
  */
 abstract class AbstractLockingProvider implements ILockingProvider {
+	const TTL = 3600; // how long until we clear stray locks in seconds
+
 	protected $acquiredLocks = [
 		'shared' => [],
 		'exclusive' => []

lib/private/lock/dblockingprovider.php

@@ -51,8 +51,6 @@ class DBLockingProvider extends AbstractLockingProvider {
 
 	private $sharedLocks = [];
 
-	const TTL = 3600; // how long until we clear stray locks in seconds
-
 	/**
 	 * Check if we have an open shared lock for a path
 	 *

lib/private/lock/memcachelockingprovider.php

@@ -21,6 +21,7 @@
 
 namespace OC\Lock;
 
+use OCP\IMemcacheTTL;
 use OCP\Lock\LockedException;
 use OCP\IMemcache;
 
@@ -37,6 +38,12 @@ class MemcacheLockingProvider extends AbstractLockingProvider {
 		$this->memcache = $memcache;
 	}
 
+	private function setTTL($path) {
+		if ($this->memcache instanceof IMemcacheTTL) {
+			$this->memcache->setTTL($path, self::TTL);
+		}
+	}
+
 	/**
 	 * @param string $path
 	 * @param int $type self::LOCK_SHARED or self::LOCK_EXCLUSIVE
@@ -69,6 +76,7 @@ class MemcacheLockingProvider extends AbstractLockingProvider {
 				throw new LockedException($path);
 			}
 		}
+		$this->setTTL($path);
 		$this->markAcquire($path, $type);
 	}
 
@@ -106,6 +114,7 @@ class MemcacheLockingProvider extends AbstractLockingProvider {
 				throw new LockedException($path);
 			}
 		}
+		$this->setTTL($path);
 		$this->markChange($path, $targetType);
 	}
 }