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<?php | |
/* | |
* This file is part of the Shieldon Simple Cache package. | |
* | |
* (c) Terry L. <contact@terryl.in> | |
* | |
* For the full copyright and license information, please view the LICENSE | |
* file that was distributed with this source code. | |
*/ | |
declare(strict_types=1); | |
namespace Shieldon\SimpleCache\Driver; | |
use Shieldon\SimpleCache\CacheProvider; | |
use Shieldon\SimpleCache\Exception\CacheException; | |
use Redis as RedisServer; | |
use Exception; | |
use function array_keys; | |
use function extension_loaded; | |
use function unserialize; | |
use function serialize; | |
use function is_bool; | |
/** | |
* A cache driver class provided by Redis database. | |
*/ | |
class Redis extends CacheProvider | |
{ | |
/** | |
* The Redis instance. | |
* | |
* @var Redis|null | |
*/ | |
protected $redis = null; | |
/** | |
* Constructor. | |
* | |
* @param array $setting The settings. | |
* | |
* @throws CacheException | |
*/ | |
public function __construct(array $setting = []) | |
{ | |
$config = [ | |
'host' => '127.0.0.1', | |
'port' => 6379, | |
'user' => null, | |
'pass' => null, | |
]; | |
foreach (array_keys($config) as $key) { | |
if (isset($setting[$key])) { | |
$config[$key] = $setting[$key]; | |
} | |
} | |
$this->connect($config); | |
} | |
/** | |
* Connect to Redis server. | |
* | |
* @param array $config The settings. | |
* | |
* @return void | |
* | |
* @throws CacheException | |
*/ | |
protected function connect(array $config): void | |
{ | |
if (extension_loaded('redis')) { | |
try { | |
$this->redis = new RedisServer(); | |
$this->redis->connect($config['host'], $config['port']); | |
if (!empty($config['user']) && !empty($config['pass'])) { | |
$this->auth([ | |
'user' => $config['user'], | |
'pass' => $config['pass'], | |
]); | |
} | |
} catch (Exception $e) { | |
throw new CacheException($e->getMessage()); | |
} | |
return; | |
} | |
throw new CacheException( | |
'PHP Redis extension is not installed on your system.' | |
); | |
} | |
/** | |
* Fetch a cache by an extended Cache Driver. | |
* | |
* @param string $key The key of a cache. | |
* | |
* @return array | |
*/ | |
protected function doGet(string $key): array | |
{ | |
$content = $this->redis->get($this->getKeyName($key)); | |
if (empty($content)) { | |
return []; | |
} | |
$data = unserialize($content); | |
return $data; | |
} | |
/** | |
* Set a cache by an extended Cache Driver. | |
* | |
* @param string $key The key of a cache. | |
* @param mixed $value The value of a cache. (serialized) | |
* @param int $ttl The time to live for a cache. | |
* @param int $timestamp The time to store a cache. | |
* | |
* @return bool | |
*/ | |
protected function doSet(string $key, $value, int $ttl, int $timestamp): bool | |
{ | |
$contents = [ | |
'timestamp' => $timestamp, | |
'ttl' => $ttl, | |
'value' => $value | |
]; | |
$result = $this->redis->set( | |
$this->getKeyName($key), | |
serialize($contents), | |
$ttl | |
); | |
return $result; | |
} | |
/** | |
* Delete a cache by an extended Cache Driver. | |
* | |
* @param string $key The key of a cache. | |
* | |
* @return bool | |
*/ | |
protected function doDelete(string $key): bool | |
{ | |
return $this->redis->del($this->getKeyName($key)) >= 0; | |
} | |
/** | |
* Delete all caches by an extended Cache Driver. | |
* | |
* @return bool | |
*/ | |
protected function doClear(): bool | |
{ | |
$keys = $this->redis->keys('simple_cache:*'); | |
if (!empty($keys)) { | |
foreach ($keys as $key) { | |
$this->redis->del($key); | |
} | |
} | |
return true; | |
} | |
/** | |
* Check if the cache exists or not. | |
* | |
* @param string $key The key of a cache. | |
* | |
* @return bool | |
*/ | |
protected function doHas(string $key): bool | |
{ | |
$exist = $this->redis->exists($this->getKeyName($key)); | |
// This function took a single argument and returned TRUE or FALSE in phpredis versions < 4.0.0. | |
// @codeCoverageIgnoreStart | |
if (is_bool($exist)) { | |
return $exist; | |
} | |
return $exist > 0; | |
// @codeCoverageIgnoreEnd | |
} | |
/** | |
* Get the key name of a cache. | |
* | |
* @param string $key The key of a cache. | |
* | |
* @return string | |
*/ | |
private function getKeyName(string $key): string | |
{ | |
return 'simple_cache:' . md5($key); | |
} | |
} | |