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<?php
namespace Doctrine\Common\Cache;
use Memcached;
use function array_keys;
use function preg_match;
use function strlen;
use function strpos;
use function time;
/**
* Memcached cache provider.
*
* @link www.doctrine-project.org
*/
class MemcachedCache extends CacheProvider
{
public const CACHE_ID_MAX_LENGTH = 250;
/** @var Memcached|null */
private $memcached;
/**
* Sets the memcache instance to use.
*
* @return void
*/
public function setMemcached(Memcached $memcached)
{
$this->memcached = $memcached;
}
/**
* Gets the memcached instance used by the cache.
*
* @return Memcached|null
*/
public function getMemcached()
{
return $this->memcached;
}
/**
* {@inheritdoc}
*/
protected function doFetch($id)
{
return $this->memcached->get($id);
}
/**
* {@inheritdoc}
*/
protected function doFetchMultiple(array $keys)
{
return $this->memcached->getMulti($keys) ?: [];
}
/**
* {@inheritdoc}
*/
protected function doSaveMultiple(array $keysAndValues, $lifetime = 0)
{
foreach (array_keys($keysAndValues) as $id) {
$this->validateCacheId($id);
}
if ($lifetime > 30 * 24 * 3600) {
$lifetime = time() + $lifetime;
}
return $this->memcached->setMulti($keysAndValues, $lifetime);
}
/**
* {@inheritdoc}
*/
protected function doContains($id)
{
$this->memcached->get($id);
return $this->memcached->getResultCode() === Memcached::RES_SUCCESS;
}
/**
* {@inheritdoc}
*/
protected function doSave($id, $data, $lifeTime = 0)
{
$this->validateCacheId($id);
if ($lifeTime > 30 * 24 * 3600) {
$lifeTime = time() + $lifeTime;
}
return $this->memcached->set($id, $data, (int) $lifeTime);
}
/**
* {@inheritdoc}
*/
protected function doDeleteMultiple(array $keys)
{
return $this->memcached->deleteMulti($keys)
|| $this->memcached->getResultCode() === Memcached::RES_NOTFOUND;
}
/**
* {@inheritdoc}
*/
protected function doDelete($id)
{
return $this->memcached->delete($id)
|| $this->memcached->getResultCode() === Memcached::RES_NOTFOUND;
}
/**
* {@inheritdoc}
*/
protected function doFlush()
{
return $this->memcached->flush();
}
/**
* {@inheritdoc}
*/
protected function doGetStats()
{
$stats = $this->memcached->getStats();
$servers = $this->memcached->getServerList();
$key = $servers[0]['host'] . ':' . $servers[0]['port'];
$stats = $stats[$key];
return [
Cache::STATS_HITS => $stats['get_hits'],
Cache::STATS_MISSES => $stats['get_misses'],
Cache::STATS_UPTIME => $stats['uptime'],
Cache::STATS_MEMORY_USAGE => $stats['bytes'],
Cache::STATS_MEMORY_AVAILABLE => $stats['limit_maxbytes'],
];
}
/**
* Validate the cache id
*
* @see https://github.com/memcached/memcached/blob/1.5.12/doc/protocol.txt#L41-L49
*
* @param string $id
*
* @return void
*
* @throws InvalidCacheId
*/
private function validateCacheId($id)
{
if (strlen($id) > self::CACHE_ID_MAX_LENGTH) {
throw InvalidCacheId::exceedsMaxLength($id, self::CACHE_ID_MAX_LENGTH);
}
if (strpos($id, ' ') !== false) {
throw InvalidCacheId::containsUnauthorizedCharacter($id, ' ');
}
if (preg_match('/[\t\r\n]/', $id) === 1) {
throw InvalidCacheId::containsControlCharacter($id);
}
}
}