484 Zeilen
16 KiB
PHP
484 Zeilen
16 KiB
PHP
<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_Cache
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* @subpackage Zend_Cache_Backend
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* @copyright Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id$
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*/
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/**
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* @see Zend_Cache_Backend_Interface
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*/
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require_once 'Zend/Cache/Backend/ExtendedInterface.php';
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/**
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* @see Zend_Cache_Backend
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*/
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require_once 'Zend/Cache/Backend.php';
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/**
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* @package Zend_Cache
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* @subpackage Zend_Cache_Backend
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* @copyright Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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class Zend_Cache_Backend_Libmemcached extends Zend_Cache_Backend implements Zend_Cache_Backend_ExtendedInterface
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{
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/**
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* Default Server Values
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*/
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const DEFAULT_HOST = '127.0.0.1';
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const DEFAULT_PORT = 11211;
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const DEFAULT_WEIGHT = 1;
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/**
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* Log message
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*/
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const TAGS_UNSUPPORTED_BY_CLEAN_OF_LIBMEMCACHED_BACKEND = 'Zend_Cache_Backend_Libmemcached::clean() : tags are unsupported by the Libmemcached backend';
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const TAGS_UNSUPPORTED_BY_SAVE_OF_LIBMEMCACHED_BACKEND = 'Zend_Cache_Backend_Libmemcached::save() : tags are unsupported by the Libmemcached backend';
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/**
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* Available options
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*
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* =====> (array) servers :
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* an array of memcached server ; each memcached server is described by an associative array :
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* 'host' => (string) : the name of the memcached server
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* 'port' => (int) : the port of the memcached server
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* 'weight' => (int) : number of buckets to create for this server which in turn control its
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* probability of it being selected. The probability is relative to the total
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* weight of all servers.
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* =====> (array) client :
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* an array of memcached client options ; the memcached client is described by an associative array :
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* @see http://php.net/manual/memcached.constants.php
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* - The option name can be the name of the constant without the prefix 'OPT_'
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* or the integer value of this option constant
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*
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* @var array available options
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*/
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protected $_options = array(
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'servers' => array(array(
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'host' => self::DEFAULT_HOST,
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'port' => self::DEFAULT_PORT,
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'weight' => self::DEFAULT_WEIGHT,
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)),
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'client' => array()
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);
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/**
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* Memcached object
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*
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* @var mixed memcached object
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*/
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protected $_memcache = null;
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/**
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* Constructor
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*
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* @param array $options associative array of options
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* @throws Zend_Cache_Exception
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* @return void
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*/
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public function __construct(array $options = array())
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{
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if (!extension_loaded('memcached')) {
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Zend_Cache::throwException('The memcached extension must be loaded for using this backend !');
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}
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// override default client options
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$this->_options['client'] = array(
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Memcached::OPT_DISTRIBUTION => Memcached::DISTRIBUTION_CONSISTENT,
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Memcached::OPT_HASH => Memcached::HASH_MD5,
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Memcached::OPT_LIBKETAMA_COMPATIBLE => true,
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);
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parent::__construct($options);
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if (isset($this->_options['servers'])) {
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$value = $this->_options['servers'];
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if (isset($value['host'])) {
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// in this case, $value seems to be a simple associative array (one server only)
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$value = array(0 => $value); // let's transform it into a classical array of associative arrays
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}
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$this->setOption('servers', $value);
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}
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$this->_memcache = new Memcached;
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// setup memcached client options
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foreach ($this->_options['client'] as $name => $value) {
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$optId = null;
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if (is_int($name)) {
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$optId = $name;
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} else {
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$optConst = 'Memcached::OPT_' . strtoupper($name);
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if (defined($optConst)) {
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$optId = constant($optConst);
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} else {
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$this->_log("Unknown memcached client option '{$name}' ({$optConst})");
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}
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}
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if ($optId) {
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if (!$this->_memcache->setOption($optId, $value)) {
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$this->_log("Setting memcached client option '{$optId}' failed");
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}
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}
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}
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// setup memcached servers
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$servers = array();
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foreach ($this->_options['servers'] as $server) {
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if (!array_key_exists('port', $server)) {
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$server['port'] = self::DEFAULT_PORT;
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}
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if (!array_key_exists('weight', $server)) {
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$server['weight'] = self::DEFAULT_WEIGHT;
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}
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$servers[] = array($server['host'], $server['port'], $server['weight']);
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}
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$this->_memcache->addServers($servers);
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}
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/**
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* Test if a cache is available for the given id and (if yes) return it (false else)
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*
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* @param string $id Cache id
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* @param boolean $doNotTestCacheValidity If set to true, the cache validity won't be tested
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* @return string|false cached datas
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*/
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public function load($id, $doNotTestCacheValidity = false)
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{
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$tmp = $this->_memcache->get($id);
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if (isset($tmp[0])) {
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return $tmp[0];
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}
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return false;
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}
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/**
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* Test if a cache is available or not (for the given id)
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*
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* @param string $id Cache id
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* @return int|false (a cache is not available) or "last modified" timestamp (int) of the available cache record
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*/
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public function test($id)
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{
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$tmp = $this->_memcache->get($id);
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if (isset($tmp[0], $tmp[1])) {
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return (int)$tmp[1];
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}
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return false;
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}
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/**
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* Save some string datas into a cache record
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*
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* Note : $data is always "string" (serialization is done by the
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* core not by the backend)
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*
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* @param string $data Datas to cache
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* @param string $id Cache id
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* @param array $tags Array of strings, the cache record will be tagged by each string entry
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* @param int $specificLifetime If != false, set a specific lifetime for this cache record (null => infinite lifetime)
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* @return boolean True if no problem
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*/
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public function save($data, $id, $tags = array(), $specificLifetime = false)
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{
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$lifetime = $this->getLifetime($specificLifetime);
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// ZF-8856: using set because add needs a second request if item already exists
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$result = @$this->_memcache->set($id, array($data, time(), $lifetime), $lifetime);
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if ($result === false) {
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$rsCode = $this->_memcache->getResultCode();
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$rsMsg = $this->_memcache->getResultMessage();
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$this->_log("Memcached::set() failed: [{$rsCode}] {$rsMsg}");
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}
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if (count($tags) > 0) {
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$this->_log(self::TAGS_UNSUPPORTED_BY_SAVE_OF_LIBMEMCACHED_BACKEND);
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}
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return $result;
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}
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/**
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* Remove a cache record
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*
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* @param string $id Cache id
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* @return boolean True if no problem
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*/
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public function remove($id)
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{
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return $this->_memcache->delete($id);
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}
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/**
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* Clean some cache records
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*
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* Available modes are :
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* 'all' (default) => remove all cache entries ($tags is not used)
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* 'old' => unsupported
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* 'matchingTag' => unsupported
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* 'notMatchingTag' => unsupported
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* 'matchingAnyTag' => unsupported
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*
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* @param string $mode Clean mode
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* @param array $tags Array of tags
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* @throws Zend_Cache_Exception
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* @return boolean True if no problem
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*/
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public function clean($mode = Zend_Cache::CLEANING_MODE_ALL, $tags = array())
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{
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switch ($mode) {
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case Zend_Cache::CLEANING_MODE_ALL:
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return $this->_memcache->flush();
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break;
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case Zend_Cache::CLEANING_MODE_OLD:
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$this->_log("Zend_Cache_Backend_Libmemcached::clean() : CLEANING_MODE_OLD is unsupported by the Libmemcached backend");
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break;
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case Zend_Cache::CLEANING_MODE_MATCHING_TAG:
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case Zend_Cache::CLEANING_MODE_NOT_MATCHING_TAG:
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case Zend_Cache::CLEANING_MODE_MATCHING_ANY_TAG:
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$this->_log(self::TAGS_UNSUPPORTED_BY_CLEAN_OF_LIBMEMCACHED_BACKEND);
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break;
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default:
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Zend_Cache::throwException('Invalid mode for clean() method');
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break;
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}
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}
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/**
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* Return true if the automatic cleaning is available for the backend
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*
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* @return boolean
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*/
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public function isAutomaticCleaningAvailable()
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{
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return false;
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}
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/**
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* Set the frontend directives
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*
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* @param array $directives Assoc of directives
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* @throws Zend_Cache_Exception
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* @return void
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*/
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public function setDirectives($directives)
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{
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parent::setDirectives($directives);
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$lifetime = $this->getLifetime(false);
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if ($lifetime > 2592000) {
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// #ZF-3490 : For the memcached backend, there is a lifetime limit of 30 days (2592000 seconds)
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$this->_log('memcached backend has a limit of 30 days (2592000 seconds) for the lifetime');
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}
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if ($lifetime === null) {
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// #ZF-4614 : we tranform null to zero to get the maximal lifetime
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parent::setDirectives(array('lifetime' => 0));
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}
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}
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/**
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* Return an array of stored cache ids
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*
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* @return array array of stored cache ids (string)
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*/
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public function getIds()
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{
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$this->_log("Zend_Cache_Backend_Libmemcached::save() : getting the list of cache ids is unsupported by the Libmemcached backend");
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return array();
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}
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/**
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* Return an array of stored tags
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*
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* @return array array of stored tags (string)
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*/
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public function getTags()
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{
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$this->_log(self::TAGS_UNSUPPORTED_BY_SAVE_OF_LIBMEMCACHED_BACKEND);
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return array();
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}
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/**
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* Return an array of stored cache ids which match given tags
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*
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* In case of multiple tags, a logical AND is made between tags
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*
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* @param array $tags array of tags
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* @return array array of matching cache ids (string)
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*/
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public function getIdsMatchingTags($tags = array())
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{
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$this->_log(self::TAGS_UNSUPPORTED_BY_SAVE_OF_LIBMEMCACHED_BACKEND);
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return array();
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}
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/**
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* Return an array of stored cache ids which don't match given tags
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*
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* In case of multiple tags, a logical OR is made between tags
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*
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* @param array $tags array of tags
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* @return array array of not matching cache ids (string)
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*/
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public function getIdsNotMatchingTags($tags = array())
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{
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$this->_log(self::TAGS_UNSUPPORTED_BY_SAVE_OF_LIBMEMCACHED_BACKEND);
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return array();
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}
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/**
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* Return an array of stored cache ids which match any given tags
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*
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* In case of multiple tags, a logical AND is made between tags
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*
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* @param array $tags array of tags
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* @return array array of any matching cache ids (string)
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*/
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public function getIdsMatchingAnyTags($tags = array())
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{
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$this->_log(self::TAGS_UNSUPPORTED_BY_SAVE_OF_LIBMEMCACHED_BACKEND);
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return array();
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}
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/**
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* Return the filling percentage of the backend storage
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*
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* @throws Zend_Cache_Exception
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* @return int integer between 0 and 100
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*/
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public function getFillingPercentage()
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{
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$mems = $this->_memcache->getStats();
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if ($mems === false) {
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return 0;
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}
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$memSize = null;
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$memUsed = null;
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foreach ($mems as $key => $mem) {
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if ($mem === false) {
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$this->_log('can\'t get stat from ' . $key);
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continue;
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}
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$eachSize = $mem['limit_maxbytes'];
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$eachUsed = $mem['bytes'];
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if ($eachUsed > $eachSize) {
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$eachUsed = $eachSize;
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}
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$memSize += $eachSize;
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$memUsed += $eachUsed;
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}
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if ($memSize === null || $memUsed === null) {
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Zend_Cache::throwException('Can\'t get filling percentage');
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}
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return ((int) (100. * ($memUsed / $memSize)));
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}
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/**
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* Return an array of metadatas for the given cache id
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*
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* The array must include these keys :
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* - expire : the expire timestamp
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* - tags : a string array of tags
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* - mtime : timestamp of last modification time
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*
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* @param string $id cache id
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* @return array array of metadatas (false if the cache id is not found)
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*/
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public function getMetadatas($id)
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{
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$tmp = $this->_memcache->get($id);
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if (isset($tmp[0], $tmp[1], $tmp[2])) {
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$data = $tmp[0];
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$mtime = $tmp[1];
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$lifetime = $tmp[2];
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return array(
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'expire' => $mtime + $lifetime,
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'tags' => array(),
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'mtime' => $mtime
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);
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}
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return false;
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}
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/**
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* Give (if possible) an extra lifetime to the given cache id
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*
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* @param string $id cache id
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* @param int $extraLifetime
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* @return boolean true if ok
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*/
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public function touch($id, $extraLifetime)
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{
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$tmp = $this->_memcache->get($id);
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if (isset($tmp[0], $tmp[1], $tmp[2])) {
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$data = $tmp[0];
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$mtime = $tmp[1];
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$lifetime = $tmp[2];
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$newLifetime = $lifetime - (time() - $mtime) + $extraLifetime;
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if ($newLifetime <=0) {
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return false;
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}
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// #ZF-5702 : we try replace() first becase set() seems to be slower
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if (!($result = $this->_memcache->replace($id, array($data, time(), $newLifetime), $newLifetime))) {
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$result = $this->_memcache->set($id, array($data, time(), $newLifetime), $newLifetime);
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if ($result === false) {
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$rsCode = $this->_memcache->getResultCode();
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$rsMsg = $this->_memcache->getResultMessage();
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$this->_log("Memcached::set() failed: [{$rsCode}] {$rsMsg}");
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}
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}
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return $result;
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}
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return false;
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}
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/**
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* Return an associative array of capabilities (booleans) of the backend
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*
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* The array must include these keys :
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* - automatic_cleaning (is automating cleaning necessary)
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* - tags (are tags supported)
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* - expired_read (is it possible to read expired cache records
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* (for doNotTestCacheValidity option for example))
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* - priority does the backend deal with priority when saving
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* - infinite_lifetime (is infinite lifetime can work with this backend)
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* - get_list (is it possible to get the list of cache ids and the complete list of tags)
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*
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* @return array associative of with capabilities
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*/
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public function getCapabilities()
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{
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return array(
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'automatic_cleaning' => false,
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'tags' => false,
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'expired_read' => false,
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'priority' => false,
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'infinite_lifetime' => false,
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'get_list' => false
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);
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}
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}
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