425 lines
12 KiB
PHP
425 lines
12 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\Cache\CacheItemInterface;
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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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/**
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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 AbstractAdapterTrait
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{
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use LoggerAwareTrait;
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/**
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* @var \Closure needs to be set by class, signature is function(string <key>, mixed <value>, bool <isHit>)
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*/
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private static $createCacheItem;
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/**
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* @var \Closure needs to be set by class, signature is function(array <deferred>, string <namespace>, array <&expiredIds>)
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*/
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private static $mergeByLifetime;
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private $namespace = '';
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private $defaultLifetime;
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private $namespaceVersion = '';
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private $versioningIsEnabled = false;
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private $deferred = [];
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private $ids = [];
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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
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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
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*/
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abstract protected function doHave(string $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
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*/
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abstract protected function doClear(string $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
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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, int $lifetime);
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/**
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* {@inheritdoc}
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*
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* @return bool
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*/
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public function hasItem($key)
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{
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$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: '.$e->getMessage(), ['key' => $key, 'exception' => $e, 'cache-adapter' => get_debug_type($this)]);
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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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* @return bool
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*/
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public function clear(string $prefix = '')
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{
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$this->deferred = [];
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if ($cleared = $this->versioningIsEnabled) {
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if ('' === $namespaceVersionToClear = $this->namespaceVersion) {
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foreach ($this->doFetch([static::NS_SEPARATOR.$this->namespace]) as $v) {
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$namespaceVersionToClear = $v;
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}
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}
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$namespaceToClear = $this->namespace.$namespaceVersionToClear;
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$namespaceVersion = self::formatNamespaceVersion(mt_rand());
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try {
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$e = $this->doSave([static::NS_SEPARATOR.$this->namespace => $namespaceVersion], 0);
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} catch (\Exception $e) {
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}
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if (true !== $e && [] !== $e) {
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$cleared = false;
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$message = 'Failed to save the new namespace'.($e instanceof \Exception ? ': '.$e->getMessage() : '.');
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CacheItem::log($this->logger, $message, ['exception' => $e instanceof \Exception ? $e : null, 'cache-adapter' => get_debug_type($this)]);
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} else {
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$this->namespaceVersion = $namespaceVersion;
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$this->ids = [];
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}
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} else {
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$namespaceToClear = $this->namespace.$prefix;
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}
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try {
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return $this->doClear($namespaceToClear) || $cleared;
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} catch (\Exception $e) {
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CacheItem::log($this->logger, 'Failed to clear the cache: '.$e->getMessage(), ['exception' => $e, 'cache-adapter' => get_debug_type($this)]);
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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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* @return bool
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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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* @return bool
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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 $e) {
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}
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$message = 'Failed to delete key "{key}"'.($e instanceof \Exception ? ': '.$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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$ok = false;
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}
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return $ok;
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}
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/**
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* {@inheritdoc}
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*/
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public function getItem($key)
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{
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$id = $this->getId($key);
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if (isset($this->deferred[$key])) {
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$this->commit();
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}
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$isHit = false;
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$value = null;
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try {
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foreach ($this->doFetch([$id]) as $value) {
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$isHit = true;
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}
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return (self::$createCacheItem)($key, $value, $isHit);
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} catch (\Exception $e) {
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CacheItem::log($this->logger, 'Failed to fetch key "{key}": '.$e->getMessage(), ['key' => $key, 'exception' => $e, 'cache-adapter' => get_debug_type($this)]);
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}
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return (self::$createCacheItem)($key, null, false);
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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 $keys = [])
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{
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$ids = [];
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$commit = false;
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foreach ($keys as $key) {
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$ids[] = $this->getId($key);
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$commit = $commit || isset($this->deferred[$key]);
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}
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if ($commit) {
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$this->commit();
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}
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try {
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$items = $this->doFetch($ids);
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} catch (\Exception $e) {
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CacheItem::log($this->logger, 'Failed to fetch items: '.$e->getMessage(), ['keys' => $keys, 'exception' => $e, 'cache-adapter' => get_debug_type($this)]);
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$items = [];
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}
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$ids = array_combine($ids, $keys);
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return $this->generateItems($items, $ids);
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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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$this->deferred[$item->getKey()] = $item;
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return $this->commit();
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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 $item)
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{
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if (!$item instanceof CacheItem) {
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return false;
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}
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$this->deferred[$item->getKey()] = $item;
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return true;
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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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* @return bool the previous state of versioning
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*/
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public function enableVersioning(bool $enable = true)
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{
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$wasEnabled = $this->versioningIsEnabled;
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$this->versioningIsEnabled = $enable;
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$this->namespaceVersion = '';
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$this->ids = [];
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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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$this->ids = [];
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}
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/**
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* @return array
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*/
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public function __sleep()
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{
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throw new \BadMethodCallException('Cannot serialize '.__CLASS__);
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}
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public function __wakeup()
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{
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throw new \BadMethodCallException('Cannot unserialize '.__CLASS__);
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}
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public function __destruct()
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{
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if ($this->deferred) {
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$this->commit();
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}
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}
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private function generateItems(iterable $items, array &$keys): \Generator
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{
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$f = self::$createCacheItem;
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try {
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foreach ($items as $id => $value) {
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if (!isset($keys[$id])) {
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throw new InvalidArgumentException(sprintf('Could not match value id "%s" to keys "%s".', $id, implode('", "', $keys)));
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}
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$key = $keys[$id];
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unset($keys[$id]);
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yield $key => $f($key, $value, true);
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}
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} catch (\Exception $e) {
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CacheItem::log($this->logger, 'Failed to fetch items: '.$e->getMessage(), ['keys' => array_values($keys), 'exception' => $e, 'cache-adapter' => get_debug_type($this)]);
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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 getId($key)
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{
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if ($this->versioningIsEnabled && '' === $this->namespaceVersion) {
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$this->ids = [];
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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 = $v;
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}
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$e = true;
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if ('1'.static::NS_SEPARATOR === $this->namespaceVersion) {
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$this->namespaceVersion = self::formatNamespaceVersion(time());
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$e = $this->doSave([static::NS_SEPARATOR.$this->namespace => $this->namespaceVersion], 0);
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}
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} catch (\Exception $e) {
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}
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if (true !== $e && [] !== $e) {
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$message = 'Failed to save the new namespace'.($e instanceof \Exception ? ': '.$e->getMessage() : '.');
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CacheItem::log($this->logger, $message, ['exception' => $e instanceof \Exception ? $e : null, 'cache-adapter' => get_debug_type($this)]);
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}
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}
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if (\is_string($key) && isset($this->ids[$key])) {
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return $this->namespace.$this->namespaceVersion.$this->ids[$key];
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}
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\assert('' !== CacheItem::validateKey($key));
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$this->ids[$key] = $key;
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if (\count($this->ids) > 1000) {
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array_splice($this->ids, 0, 500); // stop memory leak if there are many keys
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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) > $this->maxIdLength) {
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// Use MD5 to favor speed over security, which is not an issue here
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$this->ids[$key] = $id = substr_replace(base64_encode(hash('md5', $key, true)), static::NS_SEPARATOR, -(\strlen($this->namespaceVersion) + 2));
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$id = $this->namespace.$this->namespaceVersion.$id;
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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(string $class)
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{
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throw new \DomainException('Class not found: '.$class);
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}
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private static function formatNamespaceVersion(int $value): string
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{
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return strtr(substr_replace(base64_encode(pack('V', $value)), static::NS_SEPARATOR, 5), '/', '_');
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}
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}
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