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Merge branch '2.2-redis-engine' into 2.2

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lorenzo committed Apr 22, 2012
2 parents 9f415d0 + e73bb27 commit 042221bbf616521c2f41f85254d2a31313337f4a
Showing with 552 additions and 0 deletions.
  1. +216 −0 lib/Cake/Cache/Engine/RedisEngine.php
  2. +336 −0 lib/Cake/Test/Case/Cache/Engine/RedisEngineTest.php
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+<?php
+/**
+ * Redis storage engine for cache
+ *
+ *
+ * PHP 5
+ *
+ * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
+ * Copyright 2005-2012, Cake Software Foundation, Inc. (http://cakefoundation.org)
+ *
+ * Licensed under The MIT License
+ * Redistributions of files must retain the above copyright notice.
+ *
+ * @copyright Copyright 2005-2012, Cake Software Foundation, Inc. (http://cakefoundation.org)
+ * @link http://cakephp.org CakePHP(tm) Project
+ * @package Cake.Cache.Engine
+ * @since CakePHP(tm) v 2.2
+ * @license MIT License (http://www.opensource.org/licenses/mit-license.php)
+ */
+
+/**
+ * Redis storage engine for cache.
+ *
+ * @package Cake.Cache.Engine
+ */
+class RedisEngine extends CacheEngine {
+
+/**
+ * Redis wrapper.
+ *
+ * @var Redis
+ */
+ protected $_Redis = null;
+
+/**
+ * Settings
+ *
+ * - server = string url or ip to the Redis server host
+ *
+ * @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('Redis')) {
+ return false;
+ }
+ parent::init(array_merge(array(
+ 'engine' => 'Redis',
+ 'prefix' => null,
+ 'server' => '127.0.0.1',
+ 'port' => null,
+ 'persistent' => true,
+ 'serialize' => true
+ ), $settings)
+ );
+
+ return $this->_connect();
+ }
+
+/**
+ * Connects to a Redis server
+ *
+ * @return boolean True if Redis server was connected
+ */
+ protected function _connect() {
+ $return = false;
+ try {
+ $this->_Redis = new Redis();
+ if (empty($this->settings['persistent'])) {
+ $return = $this->_Redis->connect($this->settings['server']);
+ } else {
+ $return = $this->_Redis->pconnect($this->settings['server']);
+ }
+ } catch (RedisException $e) {
+ return false;
+ }
+ return $return;
+ }
+
+/**
+ * Write data for key into cache.
+ *
+ * @param string $key Identifier for the data
+ * @param mixed $value Data to be cached
+ * @param integer $duration How long to cache the data, in seconds
+ * @return boolean True if the data was successfully cached, false on failure
+ */
+ public function write($key, $value, $duration) {
+ if (!is_int($value)) {
+ $value = serialize($value);
+ }
+ if ($duration === 0) {
+ return $this->_Redis->set($key, $value);
+ }
+
+ return $this->_Redis->setex($key, $duration, $value);
+ }
+
+/**
+ * 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) {
+ $value = $this->_Redis->get($key);
+ if (ctype_digit($value)) {
+ $value = (int) $value;
+ }
+ if ($value !== false && is_string($value)) {
+ $value = unserialize($value);
+ }
+ return $value;
+ }
+
+/**
+ * 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 (int) $this->_Redis->incrBy($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 (int) $this->_Redis->decrBy($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 $this->_Redis->delete($key) > 0;
+ }
+
+/**
+ * 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 = $this->_Redis->getKeys($this->settings['prefix'] . '*');
+ $this->_Redis->del($keys);
+
+ 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() {
+ $result = array();
+ foreach ($this->settings['groups'] as $group) {
+ $value = $this->_Redis->get($this->settings['prefix'] . $group);
+ if (!$value) {
+ $value = 1;
+ $this->_Redis->set($this->settings['prefix'] . $group, $value);
+ }
+ $result[] = $group . $value;
+ }
+ 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)$this->_Redis->incr($this->settings['prefix'] . $group);
+ }
+
+/**
+ * Disconnects from the redis server
+ *
+ * @return voind
+ **/
+ public function __destruct() {
+ if (!$this->settings['persistent']) {
+ $this->_Redis->close();
+ }
+ }
+}
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