290 lines
8.0 KiB
PHP
290 lines
8.0 KiB
PHP
<?php
|
|
/**
|
|
* Memcache storage engine for cache
|
|
*
|
|
* 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
|
|
* @package Cake.Cache.Engine
|
|
* @since CakePHP(tm) v 1.2.0.4933
|
|
* @license http://www.opensource.org/licenses/mit-license.php MIT License
|
|
*/
|
|
|
|
/**
|
|
* Memcache storage engine for cache. Memcache has some limitations in the amount of
|
|
* control you have over expire times far in the future. See MemcacheEngine::write() for
|
|
* more information.
|
|
*
|
|
* @package Cake.Cache.Engine
|
|
*/
|
|
class MemcacheEngine extends CacheEngine {
|
|
|
|
/**
|
|
* Contains the compiled group names
|
|
* (prefixed with the global configuration prefix)
|
|
*
|
|
* @var array
|
|
*/
|
|
protected $_compiledGroupNames = array();
|
|
|
|
/**
|
|
* Memcache wrapper.
|
|
*
|
|
* @var Memcache
|
|
*/
|
|
protected $_Memcache = null;
|
|
|
|
/**
|
|
* Settings
|
|
*
|
|
* - servers = string or array of memcache servers, default => 127.0.0.1. If an
|
|
* array MemcacheEngine will use them as a pool.
|
|
* - compress = boolean, default => false
|
|
*
|
|
* @var array
|
|
*/
|
|
public $settings = array();
|
|
|
|
/**
|
|
* Initialize the Cache Engine
|
|
*
|
|
* Called automatically by the cache frontend
|
|
* To reinitialize the settings call Cache::engine('EngineName', [optional] settings = array());
|
|
*
|
|
* @param array $settings array of setting for the engine
|
|
* @return boolean True if the engine has been successfully initialized, false if not
|
|
*/
|
|
public function init($settings = array()) {
|
|
if (!class_exists('Memcache')) {
|
|
return false;
|
|
}
|
|
if (!isset($settings['prefix'])) {
|
|
$settings['prefix'] = Inflector::slug(APP_DIR) . '_';
|
|
}
|
|
$settings += array(
|
|
'engine' => 'Memcache',
|
|
'servers' => array('127.0.0.1'),
|
|
'compress' => false,
|
|
'persistent' => true
|
|
);
|
|
parent::init($settings);
|
|
|
|
if ($this->settings['compress']) {
|
|
$this->settings['compress'] = MEMCACHE_COMPRESSED;
|
|
}
|
|
if (is_string($this->settings['servers'])) {
|
|
$this->settings['servers'] = array($this->settings['servers']);
|
|
}
|
|
if (!isset($this->_Memcache)) {
|
|
$return = false;
|
|
$this->_Memcache = new Memcache();
|
|
foreach ($this->settings['servers'] as $server) {
|
|
list($host, $port) = $this->_parseServerString($server);
|
|
if ($this->_Memcache->addServer($host, $port, $this->settings['persistent'])) {
|
|
$return = true;
|
|
}
|
|
}
|
|
return $return;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* 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, $port);
|
|
}
|
|
|
|
/**
|
|
* Write data for key into cache. When using memcache as your cache engine
|
|
* remember that the Memcache 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 $this->_Memcache->set($key, $value, $this->settings['compress'], $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 $this->_Memcache->get($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, $offset = 1) {
|
|
if ($this->settings['compress']) {
|
|
throw new CacheException(
|
|
__d('cake_dev', 'Method %s not implemented for compressed cache in %s', 'increment()', __CLASS__)
|
|
);
|
|
}
|
|
return $this->_Memcache->increment($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, $offset = 1) {
|
|
if ($this->settings['compress']) {
|
|
throw new CacheException(
|
|
__d('cake_dev', 'Method %s not implemented for compressed cache in %s', 'decrement()', __CLASS__)
|
|
);
|
|
}
|
|
return $this->_Memcache->decrement($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 $this->_Memcache->delete($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 ($check) {
|
|
return true;
|
|
}
|
|
foreach ($this->_Memcache->getExtendedStats('slabs') as $slabs) {
|
|
foreach (array_keys($slabs) as $slabId) {
|
|
if (!is_numeric($slabId)) {
|
|
continue;
|
|
}
|
|
|
|
foreach ($this->_Memcache->getExtendedStats('cachedump', $slabId) as $stats) {
|
|
if (!is_array($stats)) {
|
|
continue;
|
|
}
|
|
foreach (array_keys($stats) as $key) {
|
|
if (strpos($key, $this->settings['prefix']) === 0) {
|
|
$this->_Memcache->delete($key);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Connects to a server in connection pool
|
|
*
|
|
* @param string $host host ip address or name
|
|
* @param integer $port Server port
|
|
* @return boolean True if memcache server was connected
|
|
*/
|
|
public function connect($host, $port = 11211) {
|
|
if ($this->_Memcache->getServerStatus($host, $port) === 0) {
|
|
if ($this->_Memcache->connect($host, $port)) {
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Returns the `group value` for each of the configured groups
|
|
* If the group initial value was not found, then it initializes
|
|
* the group accordingly.
|
|
*
|
|
* @return array
|
|
*/
|
|
public function groups() {
|
|
if (empty($this->_compiledGroupNames)) {
|
|
foreach ($this->settings['groups'] as $group) {
|
|
$this->_compiledGroupNames[] = $this->settings['prefix'] . $group;
|
|
}
|
|
}
|
|
|
|
$groups = $this->_Memcache->get($this->_compiledGroupNames);
|
|
if (count($groups) !== count($this->settings['groups'])) {
|
|
foreach ($this->_compiledGroupNames as $group) {
|
|
if (!isset($groups[$group])) {
|
|
$this->_Memcache->set($group, 1, false, 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)$this->_Memcache->increment($this->settings['prefix'] . $group);
|
|
}
|
|
}
|