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<?php |
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/** |
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* @copyright Copyright (c) 2016, ownCloud, Inc. |
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* |
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* @author Joas Schilling <[email protected]> |
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* @author Lukas Reschke <[email protected]> |
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* @author Roeland Jago Douma <[email protected]> |
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* @author Sebastian Wessalowski <[email protected]> |
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* @author Thomas Müller <[email protected]> |
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* @author Vincent Petry <[email protected]> |
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* |
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* @license AGPL-3.0 |
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* |
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* This code is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Affero General Public License, version 3, |
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* as published by the Free Software Foundation. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Affero General Public License for more details. |
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* |
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* You should have received a copy of the GNU Affero General Public License, version 3, |
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* along with this program. If not, see <http://www.gnu.org/licenses/> |
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* |
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*/ |
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namespace OC\Cache; |
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use OC\Files\Filesystem; |
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use OC\Files\View; |
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use OCP\ICache; |
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use OCP\ILogger; |
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use OCP\Security\ISecureRandom; |
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class File implements ICache { |
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/** @var View */ |
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protected $storage; |
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/** |
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* Returns the cache storage for the logged in user |
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* |
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* @return \OC\Files\View cache storage |
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* @throws \OC\ForbiddenException |
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* @throws \OC\User\NoUserException |
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*/ |
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protected function getStorage() { |
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if (isset($this->storage)) { |
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return $this->storage; |
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} |
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if (\OC::$server->getUserSession()->isLoggedIn()) { |
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$rootView = new View(); |
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$user = \OC::$server->getUserSession()->getUser(); |
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Filesystem::initMountPoints($user->getUID()); |
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View Code Duplication |
if (!$rootView->file_exists('/' . $user->getUID() . '/cache')) { |
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$rootView->mkdir('/' . $user->getUID() . '/cache'); |
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} |
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$this->storage = new View('/' . $user->getUID() . '/cache'); |
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return $this->storage; |
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} else { |
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\OCP\Util::writeLog('core', 'Can\'t get cache storage, user not logged in', ILogger::ERROR); |
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throw new \OC\ForbiddenException('Can\t get cache storage, user not logged in'); |
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} |
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} |
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/** |
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* @param string $key |
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* @return mixed|null |
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* @throws \OC\ForbiddenException |
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*/ |
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View Code Duplication |
public function get($key) { |
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$result = null; |
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if ($this->hasKey($key)) { |
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$storage = $this->getStorage(); |
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$result = $storage->file_get_contents($key); |
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} |
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return $result; |
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} |
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/** |
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* Returns the size of the stored/cached data |
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* |
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* @param string $key |
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* @return int |
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*/ |
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View Code Duplication |
public function size($key) { |
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$result = 0; |
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if ($this->hasKey($key)) { |
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$storage = $this->getStorage(); |
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$result = $storage->filesize($key); |
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} |
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return $result; |
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} |
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/** |
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* @param string $key |
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* @param mixed $value |
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* @param int $ttl |
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* @return bool|mixed |
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* @throws \OC\ForbiddenException |
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*/ |
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public function set($key, $value, $ttl = 0) { |
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$storage = $this->getStorage(); |
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$result = false; |
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// unique id to avoid chunk collision, just in case |
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$uniqueId = \OC::$server->getSecureRandom()->generate( |
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16, |
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ISecureRandom::CHAR_DIGITS . ISecureRandom::CHAR_LOWER . ISecureRandom::CHAR_UPPER |
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); |
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// use part file to prevent hasKey() to find the key |
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// while it is being written |
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$keyPart = $key . '.' . $uniqueId . '.part'; |
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if ($storage and $storage->file_put_contents($keyPart, $value)) { |
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if ($ttl === 0) { |
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$ttl = 86400; // 60*60*24 |
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} |
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$result = $storage->touch($keyPart, time() + $ttl); |
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$result &= $storage->rename($keyPart, $key); |
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} |
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return $result; |
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} |
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/** |
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* @param string $key |
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* @return bool |
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* @throws \OC\ForbiddenException |
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*/ |
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public function hasKey($key) { |
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$storage = $this->getStorage(); |
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if ($storage && $storage->is_file($key) && $storage->isReadable($key)) { |
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return true; |
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} |
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return false; |
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} |
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/** |
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* @param string $key |
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* @return bool|mixed |
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* @throws \OC\ForbiddenException |
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*/ |
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public function remove($key) { |
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$storage = $this->getStorage(); |
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if (!$storage) { |
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return false; |
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} |
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return $storage->unlink($key); |
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} |
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/** |
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* @param string $prefix |
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* @return bool |
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* @throws \OC\ForbiddenException |
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*/ |
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public function clear($prefix = '') { |
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$storage = $this->getStorage(); |
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if ($storage and $storage->is_dir('/')) { |
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$dh = $storage->opendir('/'); |
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if (is_resource($dh)) { |
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while (($file = readdir($dh)) !== false) { |
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if ($file != '.' and $file != '..' and ($prefix === '' || strpos($file, $prefix) === 0)) { |
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$storage->unlink('/' . $file); |
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} |
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} |
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} |
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} |
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return true; |
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} |
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/** |
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* Runs GC |
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* @throws \OC\ForbiddenException |
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*/ |
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public function gc() { |
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$storage = $this->getStorage(); |
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if ($storage) { |
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// extra hour safety, in case of stray part chunks that take longer to write, |
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// because touch() is only called after the chunk was finished |
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$now = time() - 3600; |
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$dh = $storage->opendir('/'); |
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if (!is_resource($dh)) { |
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return null; |
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} |
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while (($file = readdir($dh)) !== false) { |
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if ($file != '.' and $file != '..') { |
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try { |
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$mtime = $storage->filemtime('/' . $file); |
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if ($mtime < $now) { |
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$storage->unlink('/' . $file); |
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} |
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} catch (\OCP\Lock\LockedException $e) { |
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// ignore locked chunks |
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\OC::$server->getLogger()->debug('Could not cleanup locked chunk "' . $file . '"', array('app' => 'core')); |
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} catch (\OCP\Files\ForbiddenException $e) { |
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\OC::$server->getLogger()->debug('Could not cleanup forbidden chunk "' . $file . '"', array('app' => 'core')); |
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} catch (\OCP\Files\LockNotAcquiredException $e) { |
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\OC::$server->getLogger()->debug('Could not cleanup locked chunk "' . $file . '"', array('app' => 'core')); |
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} |
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} |
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} |
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} |
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} |
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} |
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nextcloud /
server
Loading history...
PHP has two types of connecting operators (logical operators, and boolean operators):
and&&or||The difference between these is the order in which they are executed. In most cases, you would want to use a boolean operator like
&&, or||.Let’s take a look at a few examples:
Logical Operators are used for Control-Flow
One case where you explicitly want to use logical operators is for control-flow such as this:
Since
dieintroduces problems of its own, f.e. it makes our code hardly testable, and prevents any kind of more sophisticated error handling; you probably do not want to use this in real-world code. Unfortunately, logical operators cannot be combined withthrowat this point:These limitations lead to logical operators rarely being of use in current PHP code.