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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\Exception\InvalidArgumentException;
use Symfony\Component\Cache\PruneableInterface;
use Symfony\Component\Cache\ResettableInterface;
use Symfony\Component\Cache\Traits\ContractsTrait;
use Symfony\Component\Cache\Traits\ProxyTrait;
use Symfony\Component\VarExporter\VarExporter;
use Symfony\Contracts\Cache\CacheInterface;
/**
* Caches items at warm up time using a PHP array that is stored in shared memory by OPCache since PHP 7.0.
* Warmed up items are read-only and run-time discovered items are cached using a fallback adapter.
*
* @author Titouan Galopin <galopintitouan@gmail.com>
* @author Nicolas Grekas <p@tchwork.com>
*/
class PhpArrayAdapter implements AdapterInterface, CacheInterface, PruneableInterface, ResettableInterface
{
use ContractsTrait;
use ProxyTrait;
private $file;
private $keys;
private $values;
private static $createCacheItem;
private static $valuesCache = [];
/**
* @param string $file The PHP file were values are cached
* @param AdapterInterface $fallbackPool A pool to fallback on when an item is not hit
*/
public function __construct(string $file, AdapterInterface $fallbackPool)
{
$this->file = $file;
$this->pool = $fallbackPool;
self::$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
);
}
/**
* This adapter takes advantage of how PHP stores arrays in its latest versions.
*
* @param string $file The PHP file were values are cached
* @param CacheItemPoolInterface $fallbackPool A pool to fallback on when an item is not hit
*
* @return CacheItemPoolInterface
*/
public static function create(string $file, CacheItemPoolInterface $fallbackPool)
{
if (!$fallbackPool instanceof AdapterInterface) {
$fallbackPool = new ProxyAdapter($fallbackPool);
}
return new static($file, $fallbackPool);
}
/**
* {@inheritdoc}
*/
public function get(string $key, callable $callback, float $beta = null, array &$metadata = null)
{
if (null === $this->values) {
$this->initialize();
}
if (!isset($this->keys[$key])) {
get_from_pool:
if ($this->pool instanceof CacheInterface) {
return $this->pool->get($key, $callback, $beta, $metadata);
}
return $this->doGet($this->pool, $key, $callback, $beta, $metadata);
}
$value = $this->values[$this->keys[$key]];
if ('N;' === $value) {
return null;
}
try {
if ($value instanceof \Closure) {
return $value();
}
} catch (\Throwable $e) {
unset($this->keys[$key]);
goto get_from_pool;
}
return $value;
}
/**
* {@inheritdoc}
*/
public function getItem($key)
{
if (!\is_string($key)) {
throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', get_debug_type($key)));
}
if (null === $this->values) {
$this->initialize();
}
if (!isset($this->keys[$key])) {
return $this->pool->getItem($key);
}
$value = $this->values[$this->keys[$key]];
$isHit = true;
if ('N;' === $value) {
$value = null;
} elseif ($value instanceof \Closure) {
try {
$value = $value();
} catch (\Throwable $e) {
$value = null;
$isHit = false;
}
}
return (self::$createCacheItem)($key, $value, $isHit);
}
/**
* {@inheritdoc}
*/
public function getItems(array $keys = [])
{
foreach ($keys as $key) {
if (!\is_string($key)) {
throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', get_debug_type($key)));
}
}
if (null === $this->values) {
$this->initialize();
}
return $this->generateItems($keys);
}
/**
* {@inheritdoc}
*
* @return bool
*/
public function hasItem($key)
{
if (!\is_string($key)) {
throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', get_debug_type($key)));
}
if (null === $this->values) {
$this->initialize();
}
return isset($this->keys[$key]) || $this->pool->hasItem($key);
}
/**
* {@inheritdoc}
*
* @return bool
*/
public function deleteItem($key)
{
if (!\is_string($key)) {
throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', get_debug_type($key)));
}
if (null === $this->values) {
$this->initialize();
}
return !isset($this->keys[$key]) && $this->pool->deleteItem($key);
}
/**
* {@inheritdoc}
*
* @return bool
*/
public function deleteItems(array $keys)
{
$deleted = true;
$fallbackKeys = [];
foreach ($keys as $key) {
if (!\is_string($key)) {
throw new InvalidArgumentException(sprintf('Cache key must be string, "%s" given.', get_debug_type($key)));
}
if (isset($this->keys[$key])) {
$deleted = false;
} else {
$fallbackKeys[] = $key;
}
}
if (null === $this->values) {
$this->initialize();
}
if ($fallbackKeys) {
$deleted = $this->pool->deleteItems($fallbackKeys) && $deleted;
}
return $deleted;
}
/**
* {@inheritdoc}
*
* @return bool
*/
public function save(CacheItemInterface $item)
{
if (null === $this->values) {
$this->initialize();
}
return !isset($this->keys[$item->getKey()]) && $this->pool->save($item);
}
/**
* {@inheritdoc}
*
* @return bool
*/
public function saveDeferred(CacheItemInterface $item)
{
if (null === $this->values) {
$this->initialize();
}
return !isset($this->keys[$item->getKey()]) && $this->pool->saveDeferred($item);
}
/**
* {@inheritdoc}
*
* @return bool
*/
public function commit()
{
return $this->pool->commit();
}
/**
* {@inheritdoc}
*
* @return bool
*/
public function clear(string $prefix = '')
{
$this->keys = $this->values = [];
$cleared = @unlink($this->file) || !file_exists($this->file);
unset(self::$valuesCache[$this->file]);
if ($this->pool instanceof AdapterInterface) {
return $this->pool->clear($prefix) && $cleared;
}
return $this->pool->clear() && $cleared;
}
/**
* Store an array of cached values.
*
* @param array $values The cached values
*
* @return string[] A list of classes to preload on PHP 7.4+
*/
public function warmUp(array $values)
{
if (file_exists($this->file)) {
if (!is_file($this->file)) {
throw new InvalidArgumentException(sprintf('Cache path exists and is not a file: "%s".', $this->file));
}
if (!is_writable($this->file)) {
throw new InvalidArgumentException(sprintf('Cache file is not writable: "%s".', $this->file));
}
} else {
$directory = \dirname($this->file);
if (!is_dir($directory) && !@mkdir($directory, 0777, true)) {
throw new InvalidArgumentException(sprintf('Cache directory does not exist and cannot be created: "%s".', $directory));
}
if (!is_writable($directory)) {
throw new InvalidArgumentException(sprintf('Cache directory is not writable: "%s".', $directory));
}
}
$preload = [];
$dumpedValues = '';
$dumpedMap = [];
$dump = <<<'EOF'
<?php
// This file has been auto-generated by the Symfony Cache Component.
return [[
EOF;
foreach ($values as $key => $value) {
CacheItem::validateKey(\is_int($key) ? (string) $key : $key);
$isStaticValue = true;
if (null === $value) {
$value = "'N;'";
} elseif (\is_object($value) || \is_array($value)) {
try {
$value = VarExporter::export($value, $isStaticValue, $preload);
} catch (\Exception $e) {
throw new InvalidArgumentException(sprintf('Cache key "%s" has non-serializable "%s" value.', $key, get_debug_type($value)), 0, $e);
}
} elseif (\is_string($value)) {
// Wrap "N;" in a closure to not confuse it with an encoded `null`
if ('N;' === $value) {
$isStaticValue = false;
}
$value = var_export($value, true);
} elseif (!\is_scalar($value)) {
throw new InvalidArgumentException(sprintf('Cache key "%s" has non-serializable "%s" value.', $key, get_debug_type($value)));
} else {
$value = var_export($value, true);
}
if (!$isStaticValue) {
$value = str_replace("\n", "\n ", $value);
$value = "static function () {\n return {$value};\n}";
}
$hash = hash('md5', $value);
if (null === $id = $dumpedMap[$hash] ?? null) {
$id = $dumpedMap[$hash] = \count($dumpedMap);
$dumpedValues .= "{$id} => {$value},\n";
}
$dump .= var_export($key, true)." => {$id},\n";
}
$dump .= "\n], [\n\n{$dumpedValues}\n]];\n";
$tmpFile = uniqid($this->file, true);
file_put_contents($tmpFile, $dump);
@chmod($tmpFile, 0666 & ~umask());
unset($serialized, $value, $dump);
@rename($tmpFile, $this->file);
unset(self::$valuesCache[$this->file]);
$this->initialize();
return $preload;
}
/**
* Load the cache file.
*/
private function initialize()
{
if (isset(self::$valuesCache[$this->file])) {
$values = self::$valuesCache[$this->file];
} elseif (!is_file($this->file)) {
$this->keys = $this->values = [];
return;
} else {
$values = self::$valuesCache[$this->file] = (include $this->file) ?: [[], []];
}
if (2 !== \count($values) || !isset($values[0], $values[1])) {
$this->keys = $this->values = [];
} else {
[$this->keys, $this->values] = $values;
}
}
private function generateItems(array $keys): \Generator
{
$f = self::$createCacheItem;
$fallbackKeys = [];
foreach ($keys as $key) {
if (isset($this->keys[$key])) {
$value = $this->values[$this->keys[$key]];
if ('N;' === $value) {
yield $key => $f($key, null, true);
} elseif ($value instanceof \Closure) {
try {
yield $key => $f($key, $value(), true);
} catch (\Throwable $e) {
yield $key => $f($key, null, false);
}
} else {
yield $key => $f($key, $value, true);
}
} else {
$fallbackKeys[] = $key;
}
}
if ($fallbackKeys) {
yield from $this->pool->getItems($fallbackKeys);
}
}
}
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