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<?php
namespace Doctrine\Common\Cache;
use Redis;
use function array_combine;
use function array_diff_key;
use function array_fill_keys;
use function array_filter;
use function array_keys;
use function count;
use function defined;
use function extension_loaded;
use function is_bool;
/**
* Redis cache provider.
*
* @link www.doctrine-project.org
*/
class RedisCache extends CacheProvider
{
/** @var Redis|null */
private $redis;
/**
* Sets the redis instance to use.
*
* @return void
*/
public function setRedis(Redis $redis)
{
$redis->setOption(Redis::OPT_SERIALIZER, $this->getSerializerValue());
$this->redis = $redis;
}
/**
* Gets the redis instance used by the cache.
*
* @return Redis|null
*/
public function getRedis()
{
return $this->redis;
}
/**
* {@inheritdoc}
*/
protected function doFetch($id)
{
return $this->redis->get($id);
}
/**
* {@inheritdoc}
*/
protected function doFetchMultiple(array $keys)
{
$fetchedItems = array_combine($keys, $this->redis->mget($keys));
// Redis mget returns false for keys that do not exist. So we need to filter those out unless it's the real data.
$keysToFilter = array_keys(array_filter($fetchedItems, static function ($item) : bool {
return $item === false;
}));
if ($keysToFilter) {
$multi = $this->redis->multi(Redis::PIPELINE);
foreach ($keysToFilter as $key) {
$multi->exists($key);
}
$existItems = array_filter($multi->exec());
$missedItemKeys = array_diff_key($keysToFilter, $existItems);
$fetchedItems = array_diff_key($fetchedItems, array_fill_keys($missedItemKeys, true));
}
return $fetchedItems;
}
/**
* {@inheritdoc}
*/
protected function doSaveMultiple(array $keysAndValues, $lifetime = 0)
{
if ($lifetime) {
// Keys have lifetime, use SETEX for each of them
$multi = $this->redis->multi(Redis::PIPELINE);
foreach ($keysAndValues as $key => $value) {
$multi->setex($key, $lifetime, $value);
}
$succeeded = array_filter($multi->exec());
return count($succeeded) == count($keysAndValues);
}
// No lifetime, use MSET
return (bool) $this->redis->mset($keysAndValues);
}
/**
* {@inheritdoc}
*/
protected function doContains($id)
{
$exists = $this->redis->exists($id);
if (is_bool($exists)) {
return $exists;
}
return $exists > 0;
}
/**
* {@inheritdoc}
*/
protected function doSave($id, $data, $lifeTime = 0)
{
if ($lifeTime > 0) {
return $this->redis->setex($id, $lifeTime, $data);
}
return $this->redis->set($id, $data);
}
/**
* {@inheritdoc}
*/
protected function doDelete($id)
{
return $this->redis->del($id) >= 0;
}
/**
* {@inheritdoc}
*/
protected function doDeleteMultiple(array $keys)
{
return $this->redis->del($keys) >= 0;
}
/**
* {@inheritdoc}
*/
protected function doFlush()
{
return $this->redis->flushDB();
}
/**
* {@inheritdoc}
*/
protected function doGetStats()
{
$info = $this->redis->info();
return [
Cache::STATS_HITS => $info['keyspace_hits'],
Cache::STATS_MISSES => $info['keyspace_misses'],
Cache::STATS_UPTIME => $info['uptime_in_seconds'],
Cache::STATS_MEMORY_USAGE => $info['used_memory'],
Cache::STATS_MEMORY_AVAILABLE => false,
];
}
/**
* Returns the serializer constant to use. If Redis is compiled with
* igbinary support, that is used. Otherwise the default PHP serializer is
* used.
*
* @return int One of the Redis::SERIALIZER_* constants
*/
protected function getSerializerValue()
{
if (defined('Redis::SERIALIZER_IGBINARY') && extension_loaded('igbinary')) {
return Redis::SERIALIZER_IGBINARY;
}
return Redis::SERIALIZER_PHP;
}
}