Viewing file:  ArrayAdapter.php (10.92 KB) -rw-r--r--
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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <[email protected]>
*
* 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\Log\LoggerAwareInterface;
use Psr\Log\LoggerAwareTrait;
use Symfony\Component\Cache\CacheItem;
use Symfony\Component\Cache\Exception\InvalidArgumentException;
use Symfony\Component\Cache\ResettableInterface;
use Symfony\Contracts\Cache\CacheInterface;
/**
* An in-memory cache storage.
*
* Acts as a least-recently-used (LRU) storage when configured with a maximum number of items.
*
* @author Nicolas Grekas <[email protected]>
*/
class ArrayAdapter implements AdapterInterface, CacheInterface, LoggerAwareInterface, ResettableInterface
{
use LoggerAwareTrait;
private $storeSerialized;
private $values = [];
private $expiries = [];
private $defaultLifetime;
private $maxLifetime;
private $maxItems;
private static $createCacheItem;
/**
* @param bool $storeSerialized Disabling serialization can lead to cache corruptions when storing mutable values but increases performance otherwise
*/
public function __construct(int $defaultLifetime = 0, bool $storeSerialized = true, float $maxLifetime = 0, int $maxItems = 0)
{
if (0 > $maxLifetime) {
throw new InvalidArgumentException(sprintf('Argument $maxLifetime must be positive, %F passed.', $maxLifetime));
}
if (0 > $maxItems) {
throw new InvalidArgumentException(sprintf('Argument $maxItems must be a positive integer, %d passed.', $maxItems));
}
$this->defaultLifetime = $defaultLifetime;
$this->storeSerialized = $storeSerialized;
$this->maxLifetime = $maxLifetime;
$this->maxItems = $maxItems;
self::$createCacheItem ?? self::$createCacheItem = \Closure::bind(
static function ($key, $value, $isHit) {
$item = new CacheItem();
$item->key = $key;
$item->value = $value;
$item->isHit = $isHit;
return $item;
},
null,
CacheItem::class
);
}
/**
* {@inheritdoc}
*/
public function get(string $key, callable $callback, float $beta = null, array &$metadata = null): mixed
{
$item = $this->getItem($key);
$metadata = $item->getMetadata();
// ArrayAdapter works in memory, we don't care about stampede protection
if (\INF === $beta || !$item->isHit()) {
$save = true;
$this->save($item->set($callback($item, $save)));
}
return $item->get();
}
/**
* {@inheritdoc}
*/
public function delete(string $key): bool
{
return $this->deleteItem($key);
}
/**
* {@inheritdoc}
*/
public function hasItem(mixed $key): bool
{
if (\is_string($key) && isset($this->expiries[$key]) && $this->expiries[$key] > microtime(true)) {
if ($this->maxItems) {
// Move the item last in the storage
$value = $this->values[$key];
unset($this->values[$key]);
$this->values[$key] = $value;
}
return true;
}
\assert('' !== CacheItem::validateKey($key));
return isset($this->expiries[$key]) && !$this->deleteItem($key);
}
/**
* {@inheritdoc}
*/
public function getItem(mixed $key): CacheItem
{
if (!$isHit = $this->hasItem($key)) {
$value = null;
if (!$this->maxItems) {
// Track misses in non-LRU mode only
$this->values[$key] = null;
}
} else {
$value = $this->storeSerialized ? $this->unfreeze($key, $isHit) : $this->values[$key];
}
return (self::$createCacheItem)($key, $value, $isHit);
}
/**
* {@inheritdoc}
*/
public function getItems(array $keys = []): iterable
{
\assert(self::validateKeys($keys));
return $this->generateItems($keys, microtime(true), self::$createCacheItem);
}
/**
* {@inheritdoc}
*/
public function deleteItem(mixed $key): bool
{
\assert('' !== CacheItem::validateKey($key));
unset($this->values[$key], $this->expiries[$key]);
return true;
}
/**
* {@inheritdoc}
*/
public function deleteItems(array $keys): bool
{
foreach ($keys as $key) {
$this->deleteItem($key);
}
return true;
}
/**
* {@inheritdoc}
*/
public function save(CacheItemInterface $item): bool
{
if (!$item instanceof CacheItem) {
return false;
}
$item = (array) $item;
$key = $item["\0*\0key"];
$value = $item["\0*\0value"];
$expiry = $item["\0*\0expiry"];
$now = microtime(true);
if (null !== $expiry) {
if (!$expiry) {
$expiry = \PHP_INT_MAX;
} elseif ($expiry <= $now) {
$this->deleteItem($key);
return true;
}
}
if ($this->storeSerialized && null === $value = $this->freeze($value, $key)) {
return false;
}
if (null === $expiry && 0 < $this->defaultLifetime) {
$expiry = $this->defaultLifetime;
$expiry = $now + ($expiry > ($this->maxLifetime ?: $expiry) ? $this->maxLifetime : $expiry);
} elseif ($this->maxLifetime && (null === $expiry || $expiry > $now + $this->maxLifetime)) {
$expiry = $now + $this->maxLifetime;
}
if ($this->maxItems) {
unset($this->values[$key]);
// Iterate items and vacuum expired ones while we are at it
foreach ($this->values as $k => $v) {
if ($this->expiries[$k] > $now && \count($this->values) < $this->maxItems) {
break;
}
unset($this->values[$k], $this->expiries[$k]);
}
}
$this->values[$key] = $value;
$this->expiries[$key] = $expiry ?? \PHP_INT_MAX;
return true;
}
/**
* {@inheritdoc}
*/
public function saveDeferred(CacheItemInterface $item): bool
{
return $this->save($item);
}
/**
* {@inheritdoc}
*/
public function commit(): bool
{
return true;
}
/**
* {@inheritdoc}
*/
public function clear(string $prefix = ''): bool
{
if ('' !== $prefix) {
$now = microtime(true);
foreach ($this->values as $key => $value) {
if (!isset($this->expiries[$key]) || $this->expiries[$key] <= $now || 0 === strpos($key, $prefix)) {
unset($this->values[$key], $this->expiries[$key]);
}
}
if ($this->values) {
return true;
}
}
$this->values = $this->expiries = [];
return true;
}
/**
* Returns all cached values, with cache miss as null.
*/
public function getValues(): array
{
if (!$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 reset()
{
$this->clear();
}
private function generateItems(array $keys, float $now, \Closure $f): \Generator
{
foreach ($keys as $i => $key) {
if (!$isHit = isset($this->expiries[$key]) && ($this->expiries[$key] > $now || !$this->deleteItem($key))) {
$value = null;
if (!$this->maxItems) {
// Track misses in non-LRU mode only
$this->values[$key] = null;
}
} else {
if ($this->maxItems) {
// Move the item last in the storage
$value = $this->values[$key];
unset($this->values[$key]);
$this->values[$key] = $value;
}
$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, string $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 $e) {
unset($this->values[$key]);
$type = get_debug_type($value);
$message = sprintf('Failed to save key "{key}" of type %s: %s', $type, $e->getMessage());
CacheItem::log($this->logger, $message, ['key' => $key, 'exception' => $e, 'cache-adapter' => get_debug_type($this)]);
return;
}
// 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' => $e, 'cache-adapter' => get_debug_type($this)]);
$value = false;
}
if (false === $value) {
$value = null;
$isHit = false;
if (!$this->maxItems) {
$this->values[$key] = null;
}
}
}
return $value;
}
private function validateKeys(array $keys): bool
{
foreach ($keys as $key) {
if (!\is_string($key) || !isset($this->expiries[$key])) {
CacheItem::validateKey($key);
}
}
return true;
}
}
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