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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\Adapter;
use Psr\Cache\CacheItemInterface;
use Psr\Cache\CacheItemPoolInterface;
use Symfony\Component\Cache\CacheItem;
use Symfony\Component\Cache\PruneableInterface;
use Symfony\Component\Cache\ResettableInterface;
use Symfony\Component\Cache\Traits\ContractsTrait;
use Symfony\Component\Cache\Traits\ProxyTrait;
use Symfony\Contracts\Cache\CacheInterface;
/**
* @author Nicolas Grekas <p@tchwork.com>
*/
class ProxyAdapter implements AdapterInterface, CacheInterface, PruneableInterface, ResettableInterface
{
use ProxyTrait;
use ContractsTrait;
private $namespace;
private $namespaceLen;
private $createCacheItem;
private $setInnerItem;
private $poolHash;
public function __construct(CacheItemPoolInterface $pool, string $namespace = '', int $defaultLifetime = 0)
{
$this->pool = $pool;
$this->poolHash = $poolHash = spl_object_hash($pool);
$this->namespace = '' === $namespace ? '' : CacheItem::validateKey($namespace);
$this->namespaceLen = \strlen($namespace);
$this->createCacheItem = \Closure::bind(
function ($key, $innerItem) use ($defaultLifetime, $poolHash) {
$item = new CacheItem();
$item->key = $key;
if (null === $innerItem) {
return $item;
}
$item->value = $v = $innerItem->get();
$item->isHit = $innerItem->isHit();
$item->innerItem = $innerItem;
$item->defaultLifetime = $defaultLifetime;
$item->poolHash = $poolHash;
// Detect wrapped values that encode for their expiry and creation duration
// For compactness, these values are packed in the key of an array using
// magic numbers in the form 9D-..-..-..-..-00-..-..-..-5F
if (\is_array($v) && 1 === \count($v) && 10 === \strlen($k = \key($v)) && "\x9D" === $k[0] && "\0" === $k[5] && "\x5F" === $k[9]) {
$item->value = $v[$k];
$v = \unpack('Ve/Nc', \substr($k, 1, -1));
$item->metadata[CacheItem::METADATA_EXPIRY] = $v['e'] + CacheItem::METADATA_EXPIRY_OFFSET;
$item->metadata[CacheItem::METADATA_CTIME] = $v['c'];
} elseif ($innerItem instanceof CacheItem) {
$item->metadata = $innerItem->metadata;
}
$innerItem->set(null);
return $item;
},
null,
CacheItem::class
);
$this->setInnerItem = \Closure::bind(
/**
* @param array $item A CacheItem cast to (array); accessing protected properties requires adding the "\0*\0" PHP prefix
*/
function (CacheItemInterface $innerItem, array $item) {
// Tags are stored separately, no need to account for them when considering this item's newly set metadata
if (isset(($metadata = $item["\0*\0newMetadata"])[CacheItem::METADATA_TAGS])) {
unset($metadata[CacheItem::METADATA_TAGS]);
}
if ($metadata) {
// For compactness, expiry and creation duration are packed in the key of an array, using magic numbers as separators
$item["\0*\0value"] = ["\x9D".pack('VN', (int) $metadata[CacheItem::METADATA_EXPIRY] - CacheItem::METADATA_EXPIRY_OFFSET, $metadata[CacheItem::METADATA_CTIME])."\x5F" => $item["\0*\0value"]];
}
$innerItem->set($item["\0*\0value"]);
$innerItem->expiresAt(null !== $item["\0*\0expiry"] ? \DateTime::createFromFormat('U.u', sprintf('%.6f', $item["\0*\0expiry"])) : null);
},
null,
CacheItem::class
);
}
/**
* {@inheritdoc}
*/
public function get(string $key, callable $callback, float $beta = null, array &$metadata = null)
{
if (!$this->pool instanceof CacheInterface) {
return $this->doGet($this, $key, $callback, $beta, $metadata);
}
return $this->pool->get($this->getId($key), function ($innerItem) use ($key, $callback) {
$item = ($this->createCacheItem)($key, $innerItem);
$item->set($value = $callback($item));
($this->setInnerItem)($innerItem, (array) $item);
return $value;
}, $beta, $metadata);
}
/**
* {@inheritdoc}
*/
public function getItem($key)
{
$f = $this->createCacheItem;
$item = $this->pool->getItem($this->getId($key));
return $f($key, $item);
}
/**
* {@inheritdoc}
*/
public function getItems(array $keys = [])
{
if ($this->namespaceLen) {
foreach ($keys as $i => $key) {
$keys[$i] = $this->getId($key);
}
}
return $this->generateItems($this->pool->getItems($keys));
}
/**
* {@inheritdoc}
*/
public function hasItem($key)
{
return $this->pool->hasItem($this->getId($key));
}
/**
* {@inheritdoc}
*/
public function clear()
{
return $this->pool->clear();
}
/**
* {@inheritdoc}
*/
public function deleteItem($key)
{
return $this->pool->deleteItem($this->getId($key));
}
/**
* {@inheritdoc}
*/
public function deleteItems(array $keys)
{
if ($this->namespaceLen) {
foreach ($keys as $i => $key) {
$keys[$i] = $this->getId($key);
}
}
return $this->pool->deleteItems($keys);
}
/**
* {@inheritdoc}
*/
public function save(CacheItemInterface $item)
{
return $this->doSave($item, __FUNCTION__);
}
/**
* {@inheritdoc}
*/
public function saveDeferred(CacheItemInterface $item)
{
return $this->doSave($item, __FUNCTION__);
}
/**
* {@inheritdoc}
*/
public function commit()
{
return $this->pool->commit();
}
private function doSave(CacheItemInterface $item, $method)
{
if (!$item instanceof CacheItem) {
return false;
}
$item = (array) $item;
if (null === $item["\0*\0expiry"] && 0 < $item["\0*\0defaultLifetime"]) {
$item["\0*\0expiry"] = microtime(true) + $item["\0*\0defaultLifetime"];
}
if ($item["\0*\0poolHash"] === $this->poolHash && $item["\0*\0innerItem"]) {
$innerItem = $item["\0*\0innerItem"];
} elseif ($this->pool instanceof AdapterInterface) {
// this is an optimization specific for AdapterInterface implementations
// so we can save a round-trip to the backend by just creating a new item
$f = $this->createCacheItem;
$innerItem = $f($this->namespace.$item["\0*\0key"], null);
} else {
$innerItem = $this->pool->getItem($this->namespace.$item["\0*\0key"]);
}
($this->setInnerItem)($innerItem, $item);
return $this->pool->$method($innerItem);
}
private function generateItems($items)
{
$f = $this->createCacheItem;
foreach ($items as $key => $item) {
if ($this->namespaceLen) {
$key = substr($key, $this->namespaceLen);
}
yield $key => $f($key, $item);
}
}
private function getId($key)
{
CacheItem::validateKey($key);
return $this->namespace.$key;
}
}
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