Store storage availability in database

Storage status is saved in the database. Failed storages are rechecked every
10 minutes, while working storages are rechecked every request.

Using the files_external app will recheck all external storages when the
settings page is viewed, or whenever an external storage is saved.

apps/files_external/lib/config.php

@@ -454,7 +454,9 @@ private static function getBackendStatus($class, $options, $isPersonal) {
 		if (class_exists($class)) {
 			try {
 				$storage = new $class($options);
-				return $storage->test($isPersonal);
+				$result = $storage->test($isPersonal);
+				$storage->setAvailability($result);
+				return $result;
 			} catch (Exception $exception) {
 				\OCP\Util::logException('files_external', $exception);
 				return false;

db_structure.xml

@@ -102,6 +102,18 @@
 				<length>4</length>
 			</field>
 
+			<field>
+				<name>available</name>
+				<type>boolean</type>
+				<default>true</default>
+				<notnull>true</notnull>
+			</field>
+
+			<field>
+				<name>last_checked</name>
+				<type>integer</type>
+			</field>
+
 			<index>
 				<name>storages_id_index</name>
 				<unique>true</unique>

lib/private/files/cache/storage.php

@@ -1,6 +1,7 @@
 <?php
 /**
  * Copyright (c) 2013 Robin Appelman <[email protected]>
+ * Copyright (c) 2015 Robin McCorkell <[email protected]>
  * This file is licensed under the Affero General Public License version 3 or
  * later.
  * See the COPYING-README file.
@@ -21,26 +22,35 @@ class Storage {
 
 	/**
 	 * @param \OC\Files\Storage\Storage|string $storage
+	 * @param bool $isAvailable
 	 */
-	public function __construct($storage) {
+	public function __construct($storage, $isAvailable = true) {
 		if ($storage instanceof \OC\Files\Storage\Storage) {
 			$this->storageId = $storage->getId();
 		} else {
 			$this->storageId = $storage;
 		}
 		$this->storageId = self::adjustStorageId($this->storageId);
 
-		$sql = 'SELECT `numeric_id` FROM `*PREFIX*storages` WHERE `id` = ?';
-		$result = \OC_DB::executeAudited($sql, array($this->storageId));
-		if ($row = $result->fetchRow()) {
+		if ($row = self::getStorageById($this->storageId)) {
 			$this->numericId = $row['numeric_id'];
 		} else {
-			$sql = 'INSERT INTO `*PREFIX*storages` (`id`) VALUES(?)';
-			\OC_DB::executeAudited($sql, array($this->storageId));
+			$sql = 'INSERT INTO `*PREFIX*storages` (`id`, `available`) VALUES(?, ?)';
+			\OC_DB::executeAudited($sql, array($this->storageId, $isAvailable));
 			$this->numericId = \OC_DB::insertid('*PREFIX*storages');
 		}
 	}
 
+	/**
+	 * @param string $storageId
+	 * @return array|null
+	 */
+	public static function getStorageById($storageId) {
+		$sql = 'SELECT * FROM `*PREFIX*storages` WHERE `id` = ?';
+		$result = \OC_DB::executeAudited($sql, array($storageId));
+		return $result->fetchRow();
+	}
+
 	/**
 	 * Adjusts the storage id to use md5 if too long
 	 * @param string $storageId storage id
@@ -81,15 +91,35 @@ public static function getStorageId($numericId) {
 	public static function getNumericStorageId($storageId) {
 		$storageId = self::adjustStorageId($storageId);
 
-		$sql = 'SELECT `numeric_id` FROM `*PREFIX*storages` WHERE `id` = ?';
-		$result = \OC_DB::executeAudited($sql, array($storageId));
-		if ($row = $result->fetchRow()) {
+		if ($row = self::getStorageById($storageId)) {
 			return $row['numeric_id'];
 		} else {
 			return null;
 		}
 	}
 
+	/**
+	 * @return array|null [ available, last_checked ]
+	 */
+	public function getAvailability() {
+		if ($row = self::getStorageById($this->storageId)) {
+			return [
+				'available' => $row['available'],
+				'last_checked' => $row['last_checked']
+			];
+		} else {
+			return null;
+		}
+	}
+
+	/**
+	 * @param bool $isAvailable
+	 */
+	public function setAvailability($isAvailable) {
+		$sql = 'UPDATE `*PREFIX*storages` SET `available` = ?, `last_checked` = ? WHERE `id` = ?';
+		\OC_DB::executeAudited($sql, array($isAvailable, time(), $this->storageId));
+	}
+
 	/**
 	 * @param string $storageId
 	 * @return bool

lib/private/files/storage/common.php

@@ -451,4 +451,21 @@ public function getDirectDownload($path) {
 		return [];
 	}
 
+	/**
+	 * Get availability of the storage
+	 *
+	 * @return array [ available, last_checked ]
+	 */
+	public function getAvailability() {
+		return $this->getStorageCache()->getAvailability();
+	}
+
+	/**
+	 * Set availability of the storage
+	 *
+	 * @param bool $isAvailable
+	 */
+	public function setAvailability($isAvailable) {
+		$this->getStorageCache()->setAvailability($isAvailable);
+	}
 }