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anikendra |
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<?php
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/**
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* Redis storage engine for cache
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*
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* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
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* Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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*
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* Licensed under The MIT License
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* For full copyright and license information, please see the LICENSE.txt
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* Redistributions of files must retain the above copyright notice.
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*
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* @copyright Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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* @link http://cakephp.org CakePHP(tm) Project
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* @package Cake.Cache.Engine
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* @since CakePHP(tm) v 2.2
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* @license http://www.opensource.org/licenses/mit-license.php MIT License
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*/
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/**
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* Redis storage engine for cache.
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*
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* @package Cake.Cache.Engine
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*/
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class RedisEngine extends CacheEngine {
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/**
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* Redis wrapper.
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*
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* @var Redis
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*/
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protected $_Redis = null;
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/**
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* Settings
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*
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* - server = string URL or ip to the Redis server host
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* - port = integer port number to the Redis server (default: 6379)
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* - timeout = float timeout in seconds (default: 0)
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* - persistent = boolean Connects to the Redis server with a persistent connection (default: true)
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*
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* @var array
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*/
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public $settings = array();
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/**
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* Initialize the Cache Engine
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*
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* Called automatically by the cache frontend
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* To reinitialize the settings call Cache::engine('EngineName', [optional] settings = array());
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*
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* @param array $settings array of setting for the engine
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* @return boolean True if the engine has been successfully initialized, false if not
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*/
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public function init($settings = array()) {
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if (!class_exists('Redis')) {
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return false;
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}
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parent::init(array_merge(array(
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'engine' => 'Redis',
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'prefix' => null,
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'server' => '127.0.0.1',
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'port' => 6379,
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'password' => false,
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'timeout' => 0,
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'persistent' => true
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), $settings)
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);
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return $this->_connect();
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}
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/**
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* Connects to a Redis server
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*
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* @return boolean True if Redis server was connected
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*/
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protected function _connect() {
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$return = false;
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try {
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$this->_Redis = new Redis();
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if (empty($this->settings['persistent'])) {
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$return = $this->_Redis->connect($this->settings['server'], $this->settings['port'], $this->settings['timeout']);
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} else {
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$return = $this->_Redis->pconnect($this->settings['server'], $this->settings['port'], $this->settings['timeout']);
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}
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} catch (RedisException $e) {
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return false;
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}
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if ($return && $this->settings['password']) {
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$return = $this->_Redis->auth($this->settings['password']);
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}
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return $return;
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}
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/**
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* Write data for key into cache.
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*
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* @param string $key Identifier for the data
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* @param mixed $value Data to be cached
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* @param integer $duration How long to cache the data, in seconds
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* @return boolean True if the data was successfully cached, false on failure
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*/
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public function write($key, $value, $duration) {
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if (!is_int($value)) {
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$value = serialize($value);
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}
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if ($duration === 0) {
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return $this->_Redis->set($key, $value);
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}
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return $this->_Redis->setex($key, $duration, $value);
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}
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/**
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* Read a key from the cache
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*
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* @param string $key Identifier for the data
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* @return mixed The cached data, or false if the data doesn't exist, has expired, or if there was an error fetching it
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*/
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public function read($key) {
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$value = $this->_Redis->get($key);
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if (ctype_digit($value)) {
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$value = (int)$value;
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}
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if ($value !== false && is_string($value)) {
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$value = unserialize($value);
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}
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return $value;
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}
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/**
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* Increments the value of an integer cached key
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*
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* @param string $key Identifier for the data
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* @param integer $offset How much to increment
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* @return New incremented value, false otherwise
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* @throws CacheException when you try to increment with compress = true
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*/
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public function increment($key, $offset = 1) {
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return (int)$this->_Redis->incrBy($key, $offset);
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}
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/**
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* Decrements the value of an integer cached key
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*
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* @param string $key Identifier for the data
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* @param integer $offset How much to subtract
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* @return New decremented value, false otherwise
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* @throws CacheException when you try to decrement with compress = true
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*/
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public function decrement($key, $offset = 1) {
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return (int)$this->_Redis->decrBy($key, $offset);
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}
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/**
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* Delete a key from the cache
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*
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* @param string $key Identifier for the data
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* @return boolean True if the value was successfully deleted, false if it didn't exist or couldn't be removed
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*/
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public function delete($key) {
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return $this->_Redis->delete($key) > 0;
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}
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/**
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* Delete all keys from the cache
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*
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* @param boolean $check
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* @return boolean True if the cache was successfully cleared, false otherwise
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*/
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public function clear($check) {
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if ($check) {
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return true;
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}
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$keys = $this->_Redis->getKeys($this->settings['prefix'] . '*');
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$this->_Redis->del($keys);
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return true;
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}
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/**
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* Returns the `group value` for each of the configured groups
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* If the group initial value was not found, then it initializes
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* the group accordingly.
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*
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* @return array
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*/
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public function groups() {
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$result = array();
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foreach ($this->settings['groups'] as $group) {
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$value = $this->_Redis->get($this->settings['prefix'] . $group);
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if (!$value) {
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$value = 1;
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$this->_Redis->set($this->settings['prefix'] . $group, $value);
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}
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$result[] = $group . $value;
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}
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return $result;
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}
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/**
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* Increments the group value to simulate deletion of all keys under a group
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* old values will remain in storage until they expire.
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*
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* @return boolean success
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*/
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public function clearGroup($group) {
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return (bool)$this->_Redis->incr($this->settings['prefix'] . $group);
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}
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/**
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* Disconnects from the redis server
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*/
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public function __destruct() {
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if (!$this->settings['persistent']) {
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$this->_Redis->close();
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}
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}
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}
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