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<?php
/**
* Joomla! Content Management System
*
* @copyright (C) 2014 Open Source Matters, Inc. <https://www.joomla.org>
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
namespace Joomla\CMS\Cache\Storage;
defined('JPATH_PLATFORM') or die;
use Joomla\CMS\Cache\CacheStorage;
use Joomla\CMS\Log\Log;
/**
* Redis cache storage handler for PECL
*
* @since 3.4
*/
class RedisStorage extends CacheStorage
{
/**
* Redis connection object
*
* @var \Redis
* @since 3.4
*/
protected static $_redis = null;
/**
* Persistent session flag
*
* @var boolean
* @since 3.4
*/
protected $_persistent = false;
/**
* Constructor
*
* @param array $options Optional parameters.
*
* @since 3.4
*/
public function __construct($options = array())
{
parent::__construct($options);
if (static::$_redis === null)
{
$this->getConnection();
}
}
/**
* Create the Redis connection
*
* @return \Redis|boolean Redis connection object on success, boolean on failure
*
* @since 3.4
* @note As of 4.0 this method will throw a JCacheExceptionConnecting object on connection failure
*/
protected function getConnection()
{
if (static::isSupported() == false)
{
return false;
}
$config = \JFactory::getConfig();
$this->_persistent = $config->get('redis_persist', true);
$server = array(
'host' => $config->get('redis_server_host', 'localhost'),
'port' => $config->get('redis_server_port', 6379),
'auth' => $config->get('redis_server_auth', null),
'db' => (int) $config->get('redis_server_db', null),
);
// If you are trying to connect to a socket file, ignore the supplied port
if ($server['host'][0] === '/')
{
$server['port'] = 0;
}
static::$_redis = new \Redis;
try
{
if ($this->_persistent)
{
$connection = static::$_redis->pconnect($server['host'], $server['port']);
}
else
{
$connection = static::$_redis->connect($server['host'], $server['port']);
}
}
catch (\RedisException $e)
{
Log::add($e->getMessage(), Log::DEBUG);
}
if ($connection == false)
{
static::$_redis = null;
// Because the application instance may not be available on cli script, use it only if needed
if (\JFactory::getApplication()->isClient('administrator'))
{
\JError::raiseWarning(500, 'Redis connection failed');
}
return false;
}
try
{
$auth = $server['auth'] ? static::$_redis->auth($server['auth']) : true;
}
catch (\RedisException $e)
{
$auth = false;
Log::add($e->getMessage(), Log::DEBUG);
}
if ($auth === false)
{
static::$_redis = null;
// Because the application instance may not be available on cli script, use it only if needed
if (\JFactory::getApplication()->isClient('administrator'))
{
\JError::raiseWarning(500, 'Redis authentication failed');
}
return false;
}
$select = static::$_redis->select($server['db']);
if ($select == false)
{
static::$_redis = null;
// Because the application instance may not be available on cli script, use it only if needed
if (\JFactory::getApplication()->isClient('administrator'))
{
\JError::raiseWarning(500, 'Redis failed to select database');
}
return false;
}
try
{
static::$_redis->ping();
}
catch (\RedisException $e)
{
static::$_redis = null;
// Because the application instance may not be available on cli script, use it only if needed
if (\JFactory::getApplication()->isClient('administrator'))
{
\JError::raiseWarning(500, 'Redis ping failed');
}
return false;
}
return static::$_redis;
}
/**
* Check if the cache contains data stored by ID and group
*
* @param string $id The cache data ID
* @param string $group The cache data group
*
* @return boolean
*
* @since 3.7.0
*/
public function contains($id, $group)
{
if (static::isConnected() == false)
{
return false;
}
// Redis exists returns integer values lets convert that to boolean see: https://redis.io/commands/exists
return (bool) static::$_redis->exists($this->_getCacheId($id, $group));
}
/**
* Get cached data by ID and group
*
* @param string $id The cache data ID
* @param string $group The cache data group
* @param boolean $checkTime True to verify cache time expiration threshold
*
* @return mixed Boolean false on failure or a cached data object
*
* @since 3.4
*/
public function get($id, $group, $checkTime = true)
{
if (static::isConnected() == false)
{
return false;
}
return static::$_redis->get($this->_getCacheId($id, $group));
}
/**
* Get all cached data
*
* @return mixed Boolean false on failure or a cached data object
*
* @since 3.4
*/
public function getAll()
{
if (static::isConnected() == false)
{
return false;
}
$allKeys = static::$_redis->keys('*');
$data = array();
$secret = $this->_hash;
if (!empty($allKeys))
{
foreach ($allKeys as $key)
{
$namearr = explode('-', $key);
if ($namearr !== false && $namearr[0] == $secret && $namearr[1] == 'cache')
{
$group = $namearr[2];
if (!isset($data[$group]))
{
$item = new CacheStorageHelper($group);
}
else
{
$item = $data[$group];
}
$item->updateSize(strlen($key)*8);
$data[$group] = $item;
}
}
}
return $data;
}
/**
* Store the data to cache by ID and group
*
* @param string $id The cache data ID
* @param string $group The cache data group
* @param string $data The data to store in cache
*
* @return boolean
*
* @since 3.4
*/
public function store($id, $group, $data)
{
if (static::isConnected() == false)
{
return false;
}
static::$_redis->setex($this->_getCacheId($id, $group), $this->_lifetime, $data);
return true;
}
/**
* Remove a cached data entry by ID and group
*
* @param string $id The cache data ID
* @param string $group The cache data group
*
* @return boolean
*
* @since 3.4
*/
public function remove($id, $group)
{
if (static::isConnected() == false)
{
return false;
}
return (bool) static::$_redis->del($this->_getCacheId($id, $group));
}
/**
* Clean cache for a group given a mode.
*
* group mode : cleans all cache in the group
* notgroup mode : cleans all cache not in the group
*
* @param string $group The cache data group
* @param string $mode The mode for cleaning cache [group|notgroup]
*
* @return boolean
*
* @since 3.4
*/
public function clean($group, $mode = null)
{
if (static::isConnected() == false)
{
return false;
}
$allKeys = static::$_redis->keys('*');
if ($allKeys === false)
{
$allKeys = array();
}
$secret = $this->_hash;
foreach ($allKeys as $key)
{
if (strpos($key, $secret . '-cache-' . $group . '-') === 0 && $mode == 'group')
{
static::$_redis->del($key);
}
if (strpos($key, $secret . '-cache-' . $group . '-') !== 0 && $mode != 'group')
{
static::$_redis->del($key);
}
}
return true;
}
/**
* Test to see if the storage handler is available.
*
* @return boolean
*
* @since 3.4
*/
public static function isSupported()
{
return class_exists('\\Redis');
}
/**
* Test to see if the Redis connection is available.
*
* @return boolean
*
* @since 3.4
*/
public static function isConnected()
{
return static::$_redis instanceof \Redis;
}
}