Merge pull request #21073 from owncloud/memcache-lock-ttl

Add ttl for redis based locking

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);
 	}
 }

lib/private/memcache/redis.php

@@ -25,9 +25,9 @@
 
 namespace OC\Memcache;
 
-use OCP\IMemcache;
+use OCP\IMemcacheTTL;
 
-class Redis extends Cache implements IMemcache {
+class Redis extends Cache implements IMemcacheTTL {
 	/**
 	 * @var \Redis $cache
 	 */
@@ -195,6 +195,10 @@ class Redis extends Cache implements IMemcache {
 		return false;
 	}
 
+	public function setTTL($key, $ttl) {
+		self::$cache->expire($this->getNamespace() . $key, $ttl);
+	}
+
 	static public function isAvailable() {
 		return extension_loaded('redis')
 		&& version_compare(phpversion('redis'), '2.2.5', '>=');

lib/public/imemcachettl.php

@@ -0,0 +1,38 @@
+<?php
+/**
+ * @author Robin Appelman <icewind@owncloud.com>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OCP;
+
+/**
+ * Interface for memcache backends that support setting ttl after the value is set
+ *
+ * @since 9.0.0
+ */
+interface IMemcacheTTL extends IMemcache {
+	/**
+	 * Set the ttl for an existing value
+	 *
+	 * @param string $key
+	 * @param int $ttl time to live in seconds
+	 * @since 9.0.0
+	 */
+	public function setTTL($key, $ttl);
+}