<?php
/**
* CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
* Copyright (c) Cake Software Foundation, Inc. (https://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. (https://cakefoundation.org)
* @link https://cakephp.org CakePHP(tm) Project
* @since 1.2.0
* @license https://opensource.org/licenses/mit-license.php MIT License
*/
namespace Cake\Cache\Engine;
use Cake\Cache\CacheEngine;
/**
* Xcache storage engine for cache
*
* @link http://trac.lighttpd.net/xcache/ Xcache
* @deprecated 3.6.0 Xcache engine has been deprecated and will be removed in 4.0.0.
*/
class XcacheEngine extends CacheEngine
{
/**
* The default config used unless overridden by runtime configuration
*
* - `duration` Specify how long items in this cache configuration last.
* - `groups` List of groups or 'tags' associated to every key stored in this config.
* handy for deleting a complete group from cache.
* - `prefix` Prefix appended to all entries. Good for when you need to share a keyspace
* with either another cache config or another application.
* - `probability` Probability of hitting a cache gc cleanup. Setting to 0 will disable
* cache::gc from ever being called automatically.
* - `PHP_AUTH_USER` xcache.admin.user
* - `PHP_AUTH_PW` xcache.admin.password
*
* @var array
*/
protected $_defaultConfig = [
'duration' => 3600,
'groups' => [],
'prefix' => null,
'probability' => 100,
'PHP_AUTH_USER' => 'user',
'PHP_AUTH_PW' => 'password'
];
/**
* Initialize the Cache Engine
*
* Called automatically by the cache frontend
*
* @param array $config array of setting for the engine
* @return bool True if the engine has been successfully initialized, false if not
*/
public function init(array $config = [])
{
if (!extension_loaded('xcache')) {
return false;
}
parent::init($config);
return true;
}
/**
* Write data for key into cache
*
* @param string $key Identifier for the data
* @param mixed $value Data to be cached
* @return bool True if the data was successfully cached, false on failure
*/
public function write($key, $value)
{
$key = $this->_key($key);
if (!is_numeric($value)) {
$value = serialize($value);
}
$duration = $this->_config['duration'];
$expires = time() + $duration;
xcache_set($key . '_expires', $expires, $duration);
return xcache_set($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)
{
$key = $this->_key($key);
if (xcache_isset($key)) {
$time = time();
$cachetime = (int)xcache_get($key . '_expires');
if ($cachetime < $time || ($time + $this->_config['duration']) < $cachetime) {
return false;
}
$value = xcache_get($key);
if (is_string($value) && !is_numeric($value)) {
$value = unserialize($value);
}
return $value;
}
return false;
}
/**
* Increments the value of an integer cached key
* If the cache key is not an integer it will be treated as 0
*
* @param string $key Identifier for the data
* @param int $offset How much to increment
* @return bool|int New incremented value, false otherwise
*/
public function increment($key, $offset = 1)
{
$key = $this->_key($key);
return xcache_inc($key, $offset);
}
/**
* Decrements the value of an integer cached key.
* If the cache key is not an integer it will be treated as 0
*
* @param string $key Identifier for the data
* @param int $offset How much to subtract
* @return bool|int New decremented value, false otherwise
*/
public function decrement($key, $offset = 1)
{
$key = $this->_key($key);
return xcache_dec($key, $offset);
}
/**
* Delete a key from the cache
*
* @param string $key Identifier for the data
* @return bool True if the value was successfully deleted, false if it didn't exist or couldn't be removed
*/
public function delete($key)
{
$key = $this->_key($key);
return xcache_unset($key);
}
/**
* Delete all keys from the cache
*
* @param bool $check If true no deletes will occur and instead CakePHP will rely
* on key TTL values.
* Unused for Xcache engine.
* @return bool True if the cache was successfully cleared, false otherwise
*/
public function clear($check)
{
$this->_auth();
$max = xcache_count(XC_TYPE_VAR);
for ($i = 0; $i < $max; $i++) {
xcache_clear_cache(XC_TYPE_VAR, $i);
}
$this->_auth(true);
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()
{
$result = [];
foreach ($this->_config['groups'] as $group) {
$value = xcache_get($this->_config['prefix'] . $group);
if (!$value) {
$value = 1;
xcache_set($this->_config['prefix'] . $group, $value, 0);
}
$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.
*
* @param string $group The group to clear.
* @return bool success
*/
public function clearGroup($group)
{
return (bool)xcache_inc($this->_config['prefix'] . $group, 1);
}
/**
* Populates and reverses $_SERVER authentication values
* Makes necessary changes (and reverting them back) in $_SERVER
*
* This has to be done because xcache_clear_cache() needs to pass Basic Http Auth
* (see xcache.admin configuration config)
*
* @param bool $reverse Revert changes
* @return void
*/
protected function _auth($reverse = false)
{
static $backup = [];
$keys = ['PHP_AUTH_USER' => 'user', 'PHP_AUTH_PW' => 'password'];
foreach ($keys as $key => $value) {
if ($reverse) {
if (isset($backup[$key])) {
$_SERVER[$key] = $backup[$key];
unset($backup[$key]);
} else {
unset($_SERVER[$key]);
}
} else {
$value = env($key);
if (!empty($value)) {
$backup[$key] = $value;
}
if (!empty($this->_config[$value])) {
$_SERVER[$key] = $this->_config[$value];
} elseif (!empty($this->_config[$key])) {
$_SERVER[$key] = $this->_config[$key];
} else {
$_SERVER[$key] = $value;
}
}
}
}
}