269 lines
7.7 KiB
PHP
269 lines
7.7 KiB
PHP
<?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\Traits;
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use Psr\Log\LoggerAwareTrait;
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use Symfony\Component\Cache\CacheItem;
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/**
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* @author Nicolas Grekas <p@tchwork.com>
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*
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* @internal
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*/
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trait AbstractTrait
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{
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use LoggerAwareTrait;
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private $namespace;
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private $namespaceVersion = '';
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private $versioningIsEnabled = false;
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private $deferred = [];
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/**
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* @var int|null The maximum length to enforce for identifiers or null when no limit applies
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*/
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protected $maxIdLength;
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/**
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* Fetches several cache items.
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*
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* @param array $ids The cache identifiers to fetch
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*
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* @return array|\Traversable The corresponding values found in the cache
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*/
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abstract protected function doFetch(array $ids);
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/**
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* Confirms if the cache contains specified cache item.
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*
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* @param string $id The identifier for which to check existence
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*
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* @return bool True if item exists in the cache, false otherwise
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*/
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abstract protected function doHave($id);
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/**
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* Deletes all items in the pool.
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*
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* @param string $namespace The prefix used for all identifiers managed by this pool
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*
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* @return bool True if the pool was successfully cleared, false otherwise
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*/
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abstract protected function doClear($namespace);
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/**
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* Removes multiple items from the pool.
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*
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* @param array $ids An array of identifiers that should be removed from the pool
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*
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* @return bool True if the items were successfully removed, false otherwise
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*/
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abstract protected function doDelete(array $ids);
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/**
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* Persists several cache items immediately.
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*
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* @param array $values The values to cache, indexed by their cache identifier
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* @param int $lifetime The lifetime of the cached values, 0 for persisting until manual cleaning
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*
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* @return array|bool The identifiers that failed to be cached or a boolean stating if caching succeeded or not
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*/
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abstract protected function doSave(array $values, $lifetime);
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/**
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* {@inheritdoc}
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*/
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public function hasItem($key)
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{
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$id = $this->getId($key);
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if (isset($this->deferred[$key])) {
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$this->commit();
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}
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try {
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return $this->doHave($id);
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} catch (\Exception $e) {
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CacheItem::log($this->logger, 'Failed to check if key "{key}" is cached', ['key' => $key, 'exception' => $e]);
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return false;
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}
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}
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/**
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* {@inheritdoc}
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*/
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public function clear()
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{
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$this->deferred = [];
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if ($cleared = $this->versioningIsEnabled) {
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$namespaceVersion = substr_replace(base64_encode(pack('V', mt_rand())), static::NS_SEPARATOR, 5);
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try {
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$cleared = $this->doSave([static::NS_SEPARATOR.$this->namespace => $namespaceVersion], 0);
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} catch (\Exception $e) {
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$cleared = false;
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}
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if ($cleared = true === $cleared || [] === $cleared) {
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$this->namespaceVersion = $namespaceVersion;
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}
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}
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try {
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return $this->doClear($this->namespace) || $cleared;
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} catch (\Exception $e) {
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CacheItem::log($this->logger, 'Failed to clear the cache', ['exception' => $e]);
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return false;
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}
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}
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/**
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* {@inheritdoc}
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*/
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public function deleteItem($key)
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{
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return $this->deleteItems([$key]);
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}
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/**
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* {@inheritdoc}
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*/
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public function deleteItems(array $keys)
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{
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$ids = [];
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foreach ($keys as $key) {
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$ids[$key] = $this->getId($key);
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unset($this->deferred[$key]);
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}
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try {
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if ($this->doDelete($ids)) {
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return true;
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}
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} catch (\Exception $e) {
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}
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$ok = true;
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// When bulk-delete failed, retry each item individually
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foreach ($ids as $key => $id) {
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try {
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$e = null;
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if ($this->doDelete([$id])) {
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continue;
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}
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} catch (\Exception $e) {
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}
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CacheItem::log($this->logger, 'Failed to delete key "{key}"', ['key' => $key, 'exception' => $e]);
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$ok = false;
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}
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return $ok;
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}
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/**
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* Enables/disables versioning of items.
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*
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* When versioning is enabled, clearing the cache is atomic and doesn't require listing existing keys to proceed,
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* but old keys may need garbage collection and extra round-trips to the back-end are required.
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*
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* Calling this method also clears the memoized namespace version and thus forces a resynchonization of it.
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*
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* @param bool $enable
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*
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* @return bool the previous state of versioning
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*/
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public function enableVersioning($enable = true)
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{
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$wasEnabled = $this->versioningIsEnabled;
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$this->versioningIsEnabled = (bool) $enable;
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$this->namespaceVersion = '';
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return $wasEnabled;
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}
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/**
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* {@inheritdoc}
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*/
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public function reset()
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{
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if ($this->deferred) {
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$this->commit();
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}
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$this->namespaceVersion = '';
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}
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/**
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* Like the native unserialize() function but throws an exception if anything goes wrong.
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*
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* @param string $value
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*
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* @return mixed
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*
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* @throws \Exception
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*/
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protected static function unserialize($value)
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{
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if ('b:0;' === $value) {
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return false;
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}
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$unserializeCallbackHandler = ini_set('unserialize_callback_func', __CLASS__.'::handleUnserializeCallback');
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try {
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if (false !== $value = unserialize($value)) {
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return $value;
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}
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throw new \DomainException('Failed to unserialize cached value.');
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} catch (\Error $e) {
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throw new \ErrorException($e->getMessage(), $e->getCode(), \E_ERROR, $e->getFile(), $e->getLine());
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} finally {
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ini_set('unserialize_callback_func', $unserializeCallbackHandler);
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}
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}
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private function getId($key)
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{
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CacheItem::validateKey($key);
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if ($this->versioningIsEnabled && '' === $this->namespaceVersion) {
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$this->namespaceVersion = '1'.static::NS_SEPARATOR;
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try {
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foreach ($this->doFetch([static::NS_SEPARATOR.$this->namespace]) as $v) {
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$this->namespaceVersion = $v;
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}
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if ('1'.static::NS_SEPARATOR === $this->namespaceVersion) {
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$this->namespaceVersion = substr_replace(base64_encode(pack('V', time())), static::NS_SEPARATOR, 5);
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$this->doSave([static::NS_SEPARATOR.$this->namespace => $this->namespaceVersion], 0);
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}
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} catch (\Exception $e) {
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}
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}
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if (null === $this->maxIdLength) {
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return $this->namespace.$this->namespaceVersion.$key;
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}
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if (\strlen($id = $this->namespace.$this->namespaceVersion.$key) > $this->maxIdLength) {
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$id = $this->namespace.$this->namespaceVersion.substr_replace(base64_encode(hash('sha256', $key, true)), static::NS_SEPARATOR, -(\strlen($this->namespaceVersion) + 22));
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}
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return $id;
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}
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/**
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* @internal
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*/
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public static function handleUnserializeCallback($class)
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{
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throw new \DomainException('Class not found: '.$class);
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}
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}
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