/
MemcachedEngine.php
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MemcachedEngine.php
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<?php
/**
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* For full copyright and license information, please see the LICENSE.txt
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @since CakePHP(tm) v 2.5.0
* @license http://www.opensource.org/licenses/mit-license.php MIT License
*/
/**
* Memcached storage engine for cache. Memcached has some limitations in the amount of
* control you have over expire times far in the future. See MemcachedEngine::write() for
* more information.
*
* Main advantage of this Memcached engine over the memcached engine is
* support of binary protocol, and igbibnary serialization
* (if memcached extension compiled with --enable-igbinary)
* Compressed keys can also be incremented/decremented
*
* @package Cake.Cache.Engine
*/
class MemcachedEngine extends CacheEngine {
/**
* memcached wrapper.
*
* @var Memcache
*/
protected $_Memcached = null;
/**
* Settings
*
* - servers = string or array of memcached servers, default => 127.0.0.1. If an
* array MemcacheEngine will use them as a pool.
* - compress = boolean, default => false
* - persistent = string The name of the persistent connection. All configurations using
* the same persistent value will share a single underlying connection.
*
* @var array
*/
public $settings = array();
/**
* List of available serializer engine
*
* Memcached must be compiled with json and igbinary support to use these engines
*
* @var array
*/
public static $serializer = array(
'igbinary' => Memcached::SERIALIZER_IGBINARY,
'json' => Memcached::SERIALIZER_JSON,
'php' => Memcached::SERIALIZER_PHP
);
/**
* Initialize the Cache Engine
*
* Called automatically by the cache frontend
* To reinitialize the settings call Cache::engine('EngineName', [optional] settings = array());
*
* @param array $settings array of setting for the engine
* @return boolean True if the engine has been successfully initialized, false if not
* @throws CacheException when you try use authentication without Memcached compiled with SASL support
*/
public function init($settings = array()) {
if (!class_exists('Memcached')) {
return false;
}
if (!isset($settings['prefix'])) {
$settings['prefix'] = Inflector::slug(APP_DIR) . '_';
}
$settings += array(
'engine' => 'Memcached',
'servers' => array('127.0.0.1'),
'compress' => false,
'persistent' => false,
'login' => null,
'password' => null,
'serializer' => 'php'
);
parent::init($settings);
if (!is_array($this->settings['servers'])) {
$this->settings['servers'] = array($this->settings['servers']);
}
if (isset($this->_Memcached)) {
return true;
}
$this->_Memcached = new Memcached($this->settings['persistent'] ? (string)$this->settings['persistent'] : null);
$this->_setOptions();
if (count($this->_Memcached->getServerList())) {
return true;
}
$servers = array();
foreach ($this->settings['servers'] as $server) {
$servers[] = $this->_parseServerString($server);
}
if (!$this->_Memcached->addServers($servers)) {
return false;
}
if ($this->settings['login'] !== null && $this->settings['password'] !== null) {
if (!method_exists($this->_Memcached, 'setSaslAuthData')) {
throw new CacheException(
__d('cake_dev', 'Memcached extension is not build with SASL support')
);
}
$this->_Memcached->setSaslAuthData($this->settings['login'], $this->settings['password']);
}
return true;
}
/**
* Settings the memcached instance
*
* @throws CacheException when the Memcached extension is not built with the desired serializer engine
*/
protected function _setOptions() {
$this->_Memcached->setOption(Memcached::OPT_LIBKETAMA_COMPATIBLE, true);
if (!array_key_exists($this->settings['serializer'], self::$serializer)) {
throw new CacheException(
__d('cake_dev', sprintf('%s is not a valid serializer engine for Memcached', $this->settings['serializer']))
);
}
$serializer = self::$serializer['php'];
switch($this->settings['serializer']) {
case 'igbinary':
if (Memcached::HAVE_IGBINARY) {
$serializer = self::$serializer['igbinary'];
} else {
throw new CacheException(
__d('cake_dev', 'Memcached extension is not compiled with igbinary support')
);
}
break;
case 'json':
if (Memcached::HAVE_JSON) {
$serializer = self::$serializer['json'];
} else {
throw new CacheException(
__d('cake_dev', 'Memcached extension is not compiled with json support')
);
}
break;
}
$this->_Memcached->setOption(Memcached::OPT_SERIALIZER, $serializer);
// Check for Amazon ElastiCache instance
if (defined('Memcached::OPT_CLIENT_MODE') && defined('Memcached::DYNAMIC_CLIENT_MODE')) {
$this->_Memcached->setOption(Memcached::OPT_CLIENT_MODE, Memcached::DYNAMIC_CLIENT_MODE);
}
$this->_Memcached->setOption(Memcached::OPT_COMPRESSION, (bool)$this->settings['compress']);
}
/**
* Parses the server address into the host/port. Handles both IPv6 and IPv4
* addresses and Unix sockets
*
* @param string $server The server address string.
* @return array Array containing host, port
*/
protected function _parseServerString($server) {
if ($server[0] === 'u') {
return array($server, 0);
}
if (substr($server, 0, 1) === '[') {
$position = strpos($server, ']:');
if ($position !== false) {
$position++;
}
} else {
$position = strpos($server, ':');
}
$port = 11211;
$host = $server;
if ($position !== false) {
$host = substr($server, 0, $position);
$port = substr($server, $position + 1);
}
return array($host, (int)$port);
}
/**
* Write data for key into cache. When using memcached as your cache engine
* remember that the Memcached pecl extension does not support cache expiry times greater
* than 30 days in the future. Any duration greater than 30 days will be treated as never expiring.
*
* @param string $key Identifier for the data
* @param mixed $value Data to be cached
* @param integer $duration How long to cache the data, in seconds
* @return boolean True if the data was successfully cached, false on failure
* @see http://php.net/manual/en/memcache.set.php
*/
public function write($key, $value, $duration) {
if ($duration > 30 * DAY) {
$duration = 0;
}
return $this->_Memcached->set($key, $value, $duration);
}
/**
* Read a key from the cache
*
* @param string $key Identifier for the data
* @return mixed The cached data, or false if the data doesn't exist, has expired, or if there was an error fetching it
*/
public function read($key) {
return $this->_Memcached->get($key);
}
/**
* Increments the value of an integer cached key
*
* @param string $key Identifier for the data
* @param integer $offset How much to increment
* @return New incremented value, false otherwise
* @throws CacheException when you try to increment with compress = true
*/
public function increment($key, $offset = 1) {
return $this->_Memcached->increment($key, $offset);
}
/**
* Decrements the value of an integer cached key
*
* @param string $key Identifier for the data
* @param integer $offset How much to subtract
* @return New decremented value, false otherwise
* @throws CacheException when you try to decrement with compress = true
*/
public function decrement($key, $offset = 1) {
return $this->_Memcached->decrement($key, $offset);
}
/**
* Delete a key from the cache
*
* @param string $key Identifier for the data
* @return boolean True if the value was successfully deleted, false if it didn't exist or couldn't be removed
*/
public function delete($key) {
return $this->_Memcached->delete($key);
}
/**
* Delete all keys from the cache
*
* @param boolean $check
* @return boolean True if the cache was successfully cleared, false otherwise
*/
public function clear($check) {
if ($check) {
return true;
}
$keys = $this->_Memcached->getAllKeys();
foreach ($keys as $key) {
if (strpos($key, $this->settings['prefix']) === 0) {
$this->_Memcached->delete($key);
}
}
return true;
}
/**
* Returns the `group value` for each of the configured groups
* If the group initial value was not found, then it initializes
* the group accordingly.
*
* @return array
*/
public function groups() {
if (empty($this->_compiledGroupNames)) {
foreach ($this->settings['groups'] as $group) {
$this->_compiledGroupNames[] = $this->settings['prefix'] . $group;
}
}
$groups = $this->_Memcached->getMulti($this->_compiledGroupNames);
if (count($groups) !== count($this->settings['groups'])) {
foreach ($this->_compiledGroupNames as $group) {
if (!isset($groups[$group])) {
$this->_Memcached->set($group, 1, 0);
$groups[$group] = 1;
}
}
ksort($groups);
}
$result = array();
$groups = array_values($groups);
foreach ($this->settings['groups'] as $i => $group) {
$result[] = $group . $groups[$i];
}
return $result;
}
/**
* Increments the group value to simulate deletion of all keys under a group
* old values will remain in storage until they expire.
*
* @return boolean success
*/
public function clearGroup($group) {
return (bool)$this->_Memcached->increment($this->settings['prefix'] . $group);
}
}