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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Cache\Traits;
use Psr\Log\LoggerAwareTrait;
use Symfony\Component\Cache\CacheItem;
/**
* @author Nicolas Grekas <p@tchwork.com>
*
* @internal
*/
trait ArrayTrait
{
use LoggerAwareTrait;
private $storeSerialized;
private $values = [];
private $expiries = [];
/**
* Returns all cached values, with cache miss as null.
*
* @return array
*/
public function getValues()
{
if (!$this->storeSerialized) {
return $this->values;
}
$values = $this->values;
foreach ($values as $k => $v) {
if (null === $v || 'N;' === $v) {
continue;
}
if (!\is_string($v) || !isset($v[2]) || ':' !== $v[1]) {
$values[$k] = serialize($v);
}
}
return $values;
}
/**
* {@inheritdoc}
*/
public function hasItem($key)
{
if (\is_string($key) && isset($this->expiries[$key]) && $this->expiries[$key] > microtime(true)) {
return true;
}
CacheItem::validateKey($key);
return isset($this->expiries[$key]) && !$this->deleteItem($key);
}
/**
* {@inheritdoc}
*/
public function clear()
{
$this->values = $this->expiries = [];
return true;
}
/**
* {@inheritdoc}
*/
public function deleteItem($key)
{
if (!\is_string($key) || !isset($this->expiries[$key])) {
CacheItem::validateKey($key);
}
unset($this->values[$key], $this->expiries[$key]);
return true;
}
/**
* {@inheritdoc}
*/
public function reset()
{
$this->clear();
}
private function generateItems(array $keys, $now, $f)
{
foreach ($keys as $i => $key) {
if (!$isHit = isset($this->expiries[$key]) && ($this->expiries[$key] > $now || !$this->deleteItem($key))) {
$this->values[$key] = $value = null;
} else {
$value = $this->storeSerialized ? $this->unfreeze($key, $isHit) : $this->values[$key];
}
unset($keys[$i]);
yield $key => $f($key, $value, $isHit);
}
foreach ($keys as $key) {
yield $key => $f($key, null, false);
}
}
private function freeze($value, $key)
{
if (null === $value) {
return 'N;';
}
if (\is_string($value)) {
// Serialize strings if they could be confused with serialized objects or arrays
if ('N;' === $value || (isset($value[2]) && ':' === $value[1])) {
return serialize($value);
}
} elseif (!is_scalar($value)) {
try {
$serialized = serialize($value);
} catch (\Exception $e) {
$type = \is_object($value) ? \get_class($value) : \gettype($value);
$message = sprintf('Failed to save key "{key}" of type %s: %s', $type, $e->getMessage());
CacheItem::log($this->logger, $message, ['key' => $key, 'exception' => $e]);
return null;
}
// Keep value serialized if it contains any objects or any internal references
if ('C' === $serialized[0] || 'O' === $serialized[0] || preg_match('/;[OCRr]:[1-9]/', $serialized)) {
return $serialized;
}
}
return $value;
}
private function unfreeze(string $key, bool &$isHit)
{
if ('N;' === $value = $this->values[$key]) {
return null;
}
if (\is_string($value) && isset($value[2]) && ':' === $value[1]) {
try {
$value = unserialize($value);
} catch (\Exception $e) {
CacheItem::log($this->logger, 'Failed to unserialize key "{key}": '.$e->getMessage(), ['key' => $key, 'exception' => $e]);
$value = false;
}
if (false === $value) {
$this->values[$key] = $value = null;
$isHit = false;
}
}
return $value;
}
}