405 lines
11 KiB
PHP
405 lines
11 KiB
PHP
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<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\Cache\Adapter;
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use Psr\Cache\CacheItemInterface;
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use Psr\Log\LoggerAwareInterface;
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use Psr\Log\LoggerAwareTrait;
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use Symfony\Component\Cache\CacheItem;
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use Symfony\Component\Cache\Exception\InvalidArgumentException;
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use Symfony\Component\Cache\ResettableInterface;
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use Symfony\Contracts\Cache\CacheInterface;
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/**
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* An in-memory cache storage.
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*
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* Acts as a least-recently-used (LRU) storage when configured with a maximum number of items.
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*
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* @author Nicolas Grekas <p@tchwork.com>
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*/
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class ArrayAdapter implements AdapterInterface, CacheInterface, LoggerAwareInterface, ResettableInterface
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{
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use LoggerAwareTrait;
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private $storeSerialized;
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private $values = [];
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private $expiries = [];
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private $defaultLifetime;
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private $maxLifetime;
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private $maxItems;
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private static $createCacheItem;
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/**
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* @param bool $storeSerialized Disabling serialization can lead to cache corruptions when storing mutable values but increases performance otherwise
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*/
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public function __construct(int $defaultLifetime = 0, bool $storeSerialized = true, float $maxLifetime = 0, int $maxItems = 0)
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{
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if (0 > $maxLifetime) {
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throw new InvalidArgumentException(sprintf('Argument $maxLifetime must be positive, %F passed.', $maxLifetime));
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}
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if (0 > $maxItems) {
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throw new InvalidArgumentException(sprintf('Argument $maxItems must be a positive integer, %d passed.', $maxItems));
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}
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$this->defaultLifetime = $defaultLifetime;
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$this->storeSerialized = $storeSerialized;
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$this->maxLifetime = $maxLifetime;
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$this->maxItems = $maxItems;
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self::$createCacheItem ?? self::$createCacheItem = \Closure::bind(
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static function ($key, $value, $isHit) {
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$item = new CacheItem();
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$item->key = $key;
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$item->value = $value;
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$item->isHit = $isHit;
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return $item;
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},
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null,
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CacheItem::class
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);
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}
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/**
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* {@inheritdoc}
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*/
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public function get(string $key, callable $callback, float $beta = null, array &$metadata = null)
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{
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$item = $this->getItem($key);
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$metadata = $item->getMetadata();
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// ArrayAdapter works in memory, we don't care about stampede protection
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if (\INF === $beta || !$item->isHit()) {
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$save = true;
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$this->save($item->set($callback($item, $save)));
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}
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return $item->get();
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}
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/**
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* {@inheritdoc}
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*/
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public function delete(string $key): bool
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{
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return $this->deleteItem($key);
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}
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/**
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* {@inheritdoc}
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*
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* @return bool
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*/
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public function hasItem($key)
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{
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if (\is_string($key) && isset($this->expiries[$key]) && $this->expiries[$key] > microtime(true)) {
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if ($this->maxItems) {
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// Move the item last in the storage
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$value = $this->values[$key];
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unset($this->values[$key]);
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$this->values[$key] = $value;
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}
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return true;
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}
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\assert('' !== CacheItem::validateKey($key));
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return isset($this->expiries[$key]) && !$this->deleteItem($key);
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}
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/**
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* {@inheritdoc}
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*/
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public function getItem($key)
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{
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if (!$isHit = $this->hasItem($key)) {
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$value = null;
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if (!$this->maxItems) {
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// Track misses in non-LRU mode only
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$this->values[$key] = null;
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}
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} else {
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$value = $this->storeSerialized ? $this->unfreeze($key, $isHit) : $this->values[$key];
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}
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return (self::$createCacheItem)($key, $value, $isHit);
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}
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/**
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* {@inheritdoc}
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*/
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public function getItems(array $keys = [])
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{
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\assert(self::validateKeys($keys));
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return $this->generateItems($keys, microtime(true), self::$createCacheItem);
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}
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/**
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* {@inheritdoc}
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*
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* @return bool
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*/
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public function deleteItem($key)
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{
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\assert('' !== CacheItem::validateKey($key));
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unset($this->values[$key], $this->expiries[$key]);
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return true;
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}
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/**
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* {@inheritdoc}
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*
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* @return bool
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*/
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public function deleteItems(array $keys)
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{
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foreach ($keys as $key) {
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$this->deleteItem($key);
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}
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return true;
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}
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/**
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* {@inheritdoc}
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*
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* @return bool
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*/
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public function save(CacheItemInterface $item)
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{
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if (!$item instanceof CacheItem) {
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return false;
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}
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$item = (array) $item;
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$key = $item["\0*\0key"];
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$value = $item["\0*\0value"];
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$expiry = $item["\0*\0expiry"];
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$now = microtime(true);
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if (null !== $expiry) {
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if (!$expiry) {
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$expiry = \PHP_INT_MAX;
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} elseif ($expiry <= $now) {
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$this->deleteItem($key);
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return true;
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}
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}
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if ($this->storeSerialized && null === $value = $this->freeze($value, $key)) {
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return false;
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}
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if (null === $expiry && 0 < $this->defaultLifetime) {
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$expiry = $this->defaultLifetime;
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$expiry = $now + ($expiry > ($this->maxLifetime ?: $expiry) ? $this->maxLifetime : $expiry);
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} elseif ($this->maxLifetime && (null === $expiry || $expiry > $now + $this->maxLifetime)) {
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$expiry = $now + $this->maxLifetime;
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}
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if ($this->maxItems) {
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unset($this->values[$key]);
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// Iterate items and vacuum expired ones while we are at it
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foreach ($this->values as $k => $v) {
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if ($this->expiries[$k] > $now && \count($this->values) < $this->maxItems) {
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break;
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}
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unset($this->values[$k], $this->expiries[$k]);
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}
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}
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$this->values[$key] = $value;
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$this->expiries[$key] = $expiry ?? \PHP_INT_MAX;
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return true;
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}
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/**
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* {@inheritdoc}
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*
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* @return bool
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*/
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public function saveDeferred(CacheItemInterface $item)
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{
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return $this->save($item);
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}
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/**
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* {@inheritdoc}
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*
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* @return bool
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*/
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public function commit()
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{
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return true;
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}
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/**
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* {@inheritdoc}
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*
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* @return bool
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*/
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public function clear(string $prefix = '')
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{
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if ('' !== $prefix) {
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$now = microtime(true);
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foreach ($this->values as $key => $value) {
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if (!isset($this->expiries[$key]) || $this->expiries[$key] <= $now || 0 === strpos($key, $prefix)) {
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unset($this->values[$key], $this->expiries[$key]);
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}
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}
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if ($this->values) {
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return true;
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}
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}
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$this->values = $this->expiries = [];
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return true;
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}
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/**
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* Returns all cached values, with cache miss as null.
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*
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* @return array
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*/
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public function getValues()
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{
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if (!$this->storeSerialized) {
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return $this->values;
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}
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$values = $this->values;
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foreach ($values as $k => $v) {
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if (null === $v || 'N;' === $v) {
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continue;
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}
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if (!\is_string($v) || !isset($v[2]) || ':' !== $v[1]) {
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$values[$k] = serialize($v);
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}
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}
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return $values;
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}
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/**
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* {@inheritdoc}
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*/
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public function reset()
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{
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$this->clear();
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}
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private function generateItems(array $keys, float $now, \Closure $f): \Generator
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{
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foreach ($keys as $i => $key) {
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if (!$isHit = isset($this->expiries[$key]) && ($this->expiries[$key] > $now || !$this->deleteItem($key))) {
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$value = null;
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if (!$this->maxItems) {
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// Track misses in non-LRU mode only
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$this->values[$key] = null;
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}
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} else {
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if ($this->maxItems) {
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// Move the item last in the storage
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$value = $this->values[$key];
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unset($this->values[$key]);
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$this->values[$key] = $value;
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}
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$value = $this->storeSerialized ? $this->unfreeze($key, $isHit) : $this->values[$key];
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}
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unset($keys[$i]);
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yield $key => $f($key, $value, $isHit);
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}
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foreach ($keys as $key) {
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yield $key => $f($key, null, false);
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}
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}
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private function freeze($value, string $key)
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{
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if (null === $value) {
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return 'N;';
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}
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if (\is_string($value)) {
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// Serialize strings if they could be confused with serialized objects or arrays
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if ('N;' === $value || (isset($value[2]) && ':' === $value[1])) {
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return serialize($value);
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}
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} elseif (!is_scalar($value)) {
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try {
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$serialized = serialize($value);
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} catch (\Exception $e) {
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unset($this->values[$key]);
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$type = get_debug_type($value);
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$message = sprintf('Failed to save key "{key}" of type %s: %s', $type, $e->getMessage());
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CacheItem::log($this->logger, $message, ['key' => $key, 'exception' => $e, 'cache-adapter' => get_debug_type($this)]);
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return;
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}
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// Keep value serialized if it contains any objects or any internal references
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if ('C' === $serialized[0] || 'O' === $serialized[0] || preg_match('/;[OCRr]:[1-9]/', $serialized)) {
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return $serialized;
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}
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}
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return $value;
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}
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private function unfreeze(string $key, bool &$isHit)
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{
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if ('N;' === $value = $this->values[$key]) {
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return null;
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}
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if (\is_string($value) && isset($value[2]) && ':' === $value[1]) {
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try {
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$value = unserialize($value);
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} catch (\Exception $e) {
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CacheItem::log($this->logger, 'Failed to unserialize key "{key}": '.$e->getMessage(), ['key' => $key, 'exception' => $e, 'cache-adapter' => get_debug_type($this)]);
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$value = false;
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}
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if (false === $value) {
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$value = null;
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$isHit = false;
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if (!$this->maxItems) {
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$this->values[$key] = null;
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}
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}
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}
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return $value;
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}
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private function validateKeys(array $keys): bool
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{
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foreach ($keys as $key) {
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if (!\is_string($key) || !isset($this->expiries[$key])) {
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CacheItem::validateKey($key);
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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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