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<?php
namespace Drupal\Core\Template;
use Drupal\Component\Utility\Crypt;
use Drupal\Core\Cache\CacheBackendInterface;
use Drupal\Core\PhpStorage\PhpStorageFactory;
/**
* Provides an alternate cache storage for Twig using PhpStorage.
*
* This class is designed to work on setups with multiple webheads using a local
* filesystem for the twig cache. When generating the cache key, a hash value
* depending on the enabled extensions is included. This prevents stale
* templates from being reused when twig extensions are enabled or disabled.
*
* @see \Drupal\Core\DependencyInjection\Compiler\TwigExtensionPass
*/
class TwigPhpStorageCache implements \Twig_CacheInterface {
/**
* The maximum length for each part of the cache key suffix.
*/
const SUFFIX_SUBSTRING_LENGTH = 25;
/**
* The cache object used for auto-refresh via mtime.
*
* @var \Drupal\Core\Cache\CacheBackendInterface
*/
protected $cache;
/**
* The PhpStorage object used for storing the templates.
*
* @var \Drupal\Component\PhpStorage\PhpStorageInterface
*/
protected $storage;
/**
* The template cache filename prefix.
*
* @var string
*/
protected $templateCacheFilenamePrefix;
/**
* Store cache backend and other information internally.
*
* @param \Drupal\Core\Cache\CacheBackendInterface $cache
* The cache bin.
* @param string $twig_cache_prefix
* A Twig cache file prefix that changes when Twig extensions change.
*/
public function __construct(CacheBackendInterface $cache, $twig_cache_prefix) {
$this->cache = $cache;
$this->templateCacheFilenamePrefix = $twig_cache_prefix;
}
/**
* Gets the PHP code storage object to use for the compiled Twig files.
*
* @return \Drupal\Component\PhpStorage\PhpStorageInterface
*/
protected function storage() {
if (!isset($this->storage)) {
$this->storage = PhpStorageFactory::get('twig');
}
return $this->storage;
}
/**
* {@inheritdoc}
*/
public function generateKey($name, $className) {
if (strpos($name, '{# inline_template_start #}') === 0) {
// $name is an inline template, and can have characters that are not valid
// for a filename. $suffix is unique for each inline template so we just
// use the generic name 'inline-template' here.
$name = 'inline-template';
}
else {
$name = basename($name);
}
// Windows (and some encrypted Linux systems) only support 255 characters in
// a path. On Windows a requirements error is displayed and installation is
// blocked if Drupal's public files path is longer than 120 characters.
// Thus, to always be less than 255, file paths may not be more than 135
// characters long. Using the default PHP file storage class, the Twig cache
// file path will be 124 characters long at most, which provides a margin of
// safety.
$suffix = substr($name, 0, self::SUFFIX_SUBSTRING_LENGTH) . '_';
$suffix .= substr(Crypt::hashBase64($className), 0, self::SUFFIX_SUBSTRING_LENGTH);
// The cache prefix is what gets invalidated.
return $this->templateCacheFilenamePrefix . '_' . $suffix;
}
/**
* {@inheritdoc}
*/
public function load($key) {
$this->storage()->load($key);
}
/**
* {@inheritdoc}
*/
public function write($key, $content) {
$this->storage()->save($key, $content);
// Save the last mtime.
$cid = 'twig:' . $key;
$this->cache->set($cid, REQUEST_TIME);
}
/**
* {@inheritdoc}
*/
public function getTimestamp($key) {
$cid = 'twig:' . $key;
if ($cache = $this->cache->get($cid)) {
return $cache->data;
}
else {
return 0;
}
}
}