From 15dae6198fc4855519a0ed2347c29485a061f6aa Mon Sep 17 00:00:00 2001
From: Robin Appelman <icewind@owncloud.com>
Date: Sat, 20 Apr 2013 16:38:03 +0200
Subject: [PATCH] Cache: add a backgroundjob to check for external changes to
 the filesystem

---
 apps/files/appinfo/app.php            |  4 +-
 lib/files/cache/backgroundwatcher.php | 73 +++++++++++++++++++++++++++
 lib/files/cache/cache.php             |  1 +
 lib/files/cache/permissions.php       | 15 ++++++
 tests/lib/files/cache/permissions.php |  6 ++-
 5 files changed, 96 insertions(+), 3 deletions(-)
 create mode 100644 lib/files/cache/backgroundwatcher.php

diff --git a/apps/files/appinfo/app.php b/apps/files/appinfo/app.php
index 703b1c7cb6..05ab1722b3 100644
--- a/apps/files/appinfo/app.php
+++ b/apps/files/appinfo/app.php
@@ -18,4 +18,6 @@ OC_Search::registerProvider('OC_Search_Provider_File');
 \OC_Hook::connect('OC_Filesystem', 'post_write', '\OC\Files\Cache\Updater', 'writeHook');
 \OC_Hook::connect('OC_Filesystem', 'post_touch', '\OC\Files\Cache\Updater', 'touchHook');
 \OC_Hook::connect('OC_Filesystem', 'post_delete', '\OC\Files\Cache\Updater', 'deleteHook');
-\OC_Hook::connect('OC_Filesystem', 'post_rename', '\OC\Files\Cache\Updater', 'renameHook');
\ No newline at end of file
+\OC_Hook::connect('OC_Filesystem', 'post_rename', '\OC\Files\Cache\Updater', 'renameHook');
+
+\OC_BackgroundJob_RegularTask::register('\OC\Files\Cache\BackgroundWatcher', 'checkNext');
diff --git a/lib/files/cache/backgroundwatcher.php b/lib/files/cache/backgroundwatcher.php
new file mode 100644
index 0000000000..3bcd447f53
--- /dev/null
+++ b/lib/files/cache/backgroundwatcher.php
@@ -0,0 +1,73 @@
+<?php
+/**
+ * Copyright (c) 2013 Robin Appelman <icewind@owncloud.com>
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ */
+
+namespace OC\Files\Cache;
+
+use \OC\Files\Mount;
+use \OC\Files\Filesystem;
+
+class BackgroundWatcher {
+	static private function checkUpdate($id) {
+		$cacheItem = Cache::getById($id);
+		if (is_null($cacheItem)) {
+			return;
+		}
+		list($storageId, $internalPath) = $cacheItem;
+		$mounts = Mount::findByStorageId($storageId);
+
+		if (count($mounts) === 0) {
+			//if the storage we need isn't mounted on default, try to find a user that has access to the storage
+			$permissionsCache = new Permissions($storageId);
+			$users = $permissionsCache->getUsers($id);
+			if (count($users) === 0) {
+				return;
+			}
+			Filesystem::initMountPoints($users[0]);
+			$mounts = Mount::findByStorageId($storageId);
+			if (count($mounts) === 0) {
+				return;
+			}
+		}
+		$storage = $mounts[0]->getStorage();
+		$watcher = new Watcher($storage);
+		$watcher->checkUpdate($internalPath);
+	}
+
+	/**
+	 * get the next fileid in the cache
+	 *
+	 * @param int $previous
+	 * @return int
+	 */
+	static private function getNextFileId($previous) {
+		$query = \OC_DB::prepare('SELECT `fileid` FROM `*PREFIX*filecache` WHERE `fileid` > ? ORDER BY `fileid` ASC', 1);
+		$result = $query->execute(array($previous));
+		if ($row = $result->fetchRow()) {
+			return $row['fileid'];
+		} else {
+			return 0;
+		}
+	}
+
+	static public function checkNext() {
+		$previous = \OC_Appconfig::getValue('files', 'backgroundwatcher_previous', 0);
+		$next = self::getNextFileId($previous);
+		error_log($next);
+		\OC_Appconfig::setValue('files', 'backgroundwatcher_previous', $next);
+		self::checkUpdate($next);
+	}
+
+	static public function checkAll() {
+		$previous = 0;
+		$next = 1;
+		while ($next != 0) {
+			$next = self::getNextFileId($previous);
+			self::checkUpdate($next);
+		}
+	}
+}
diff --git a/lib/files/cache/cache.php b/lib/files/cache/cache.php
index 71b70abe3f..3ed3490f29 100644
--- a/lib/files/cache/cache.php
+++ b/lib/files/cache/cache.php
@@ -517,6 +517,7 @@ class Cache {
 	/**
 	 * get the storage id of the storage for a file and the internal path of the file
 	 *
+	 * @param int $id
 	 * @return array, first element holding the storage id, second the path
 	 */
 	static public function getById($id) {
diff --git a/lib/files/cache/permissions.php b/lib/files/cache/permissions.php
index a5c9c14405..faa5ff5eac 100644
--- a/lib/files/cache/permissions.php
+++ b/lib/files/cache/permissions.php
@@ -107,4 +107,19 @@ class Permissions {
 			$query->execute(array($fileId, $user));
 		}
 	}
+
+	/**
+	 * get the list of users which have permissions stored for a file
+	 *
+	 * @param int $fileId
+	 */
+	public function getUsers($fileId) {
+		$query = \OC_DB::prepare('SELECT `user` FROM `*PREFIX*permissions` WHERE `fileid` = ?');
+		$result = $query->execute(array($fileId));
+		$users = array();
+		while ($row = $result->fetchRow()) {
+			$users[] = $row['user'];
+		}
+		return $users;
+	}
 }
diff --git a/tests/lib/files/cache/permissions.php b/tests/lib/files/cache/permissions.php
index 56dbbc4518..7e6e11e2eb 100644
--- a/tests/lib/files/cache/permissions.php
+++ b/tests/lib/files/cache/permissions.php
@@ -14,8 +14,8 @@ class Permissions extends \PHPUnit_Framework_TestCase {
 	 */
 	private $permissionsCache;
 
-	function setUp(){
-		$this->permissionsCache=new \OC\Files\Cache\Permissions('dummy');
+	function setUp() {
+		$this->permissionsCache = new \OC\Files\Cache\Permissions('dummy');
 	}
 
 	function testSimple() {
@@ -23,8 +23,10 @@ class Permissions extends \PHPUnit_Framework_TestCase {
 		$user = uniqid();
 
 		$this->assertEquals(-1, $this->permissionsCache->get(1, $user));
+		$this->assertNotContains($user, $this->permissionsCache->getUsers(1));
 		$this->permissionsCache->set(1, $user, 1);
 		$this->assertEquals(1, $this->permissionsCache->get(1, $user));
+		$this->assertContains($user, $this->permissionsCache->getUsers(1));
 		$this->assertEquals(-1, $this->permissionsCache->get(2, $user));
 		$this->assertEquals(-1, $this->permissionsCache->get(1, $user . '2'));