680 lines
22 KiB
PHP
680 lines
22 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) 2005-2010 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: Sqlite.php 20096 2010-01-06 02:05:09Z bkarwin $
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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) 2005-2010 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_Sqlite extends Zend_Cache_Backend implements Zend_Cache_Backend_ExtendedInterface
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{
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/**
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* Available options
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*
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* =====> (string) cache_db_complete_path :
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* - the complete path (filename included) of the SQLITE database
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*
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* ====> (int) automatic_vacuum_factor :
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* - Disable / Tune the automatic vacuum process
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* - The automatic vacuum process defragment the database file (and make it smaller)
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* when a clean() or delete() is called
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* 0 => no automatic vacuum
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* 1 => systematic vacuum (when delete() or clean() methods are called)
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* x (integer) > 1 => automatic vacuum randomly 1 times on x clean() or delete()
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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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'cache_db_complete_path' => null,
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'automatic_vacuum_factor' => 10
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);
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/**
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* DB ressource
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*
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* @var mixed $_db
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*/
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private $_db = null;
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/**
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* Boolean to store if the structure has benn checked or not
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*
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* @var boolean $_structureChecked
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*/
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private $_structureChecked = false;
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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 $options = array())
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{
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parent::__construct($options);
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if ($this->_options['cache_db_complete_path'] === null) {
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Zend_Cache::throwException('cache_db_complete_path option has to set');
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}
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if (!extension_loaded('sqlite')) {
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Zend_Cache::throwException("Cannot use SQLite storage because the 'sqlite' extension is not loaded in the current PHP environment");
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}
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$this->_getConnection();
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}
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/**
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* Destructor
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*
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* @return void
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*/
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public function __destruct()
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{
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@sqlite_close($this->_getConnection());
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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, $doNotTestCacheValidity = false)
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{
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$this->_checkAndBuildStructure();
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$sql = "SELECT content FROM cache WHERE id='$id'";
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if (!$doNotTestCacheValidity) {
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$sql = $sql . " AND (expire=0 OR expire>" . time() . ')';
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}
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$result = $this->_query($sql);
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$row = @sqlite_fetch_array($result);
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if ($row) {
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return $row['content'];
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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 $id Cache id
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* @return mixed|false (a cache is not available) or "last modified" timestamp (int) of the available cache record
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*/
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public function test($id)
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{
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$this->_checkAndBuildStructure();
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$sql = "SELECT lastModified FROM cache WHERE id='$id' AND (expire=0 OR expire>" . time() . ')';
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$result = $this->_query($sql);
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$row = @sqlite_fetch_array($result);
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if ($row) {
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return ((int) $row['lastModified']);
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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 $specificLifetime If != false, set a specific lifetime for this cache record (null => infinite lifetime)
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* @throws Zend_Cache_Exception
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* @return boolean True if no problem
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*/
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public function save($data, $id, $tags = array(), $specificLifetime = false)
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{
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$this->_checkAndBuildStructure();
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$lifetime = $this->getLifetime($specificLifetime);
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$data = @sqlite_escape_string($data);
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$mktime = time();
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if ($lifetime === null) {
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$expire = 0;
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} else {
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$expire = $mktime + $lifetime;
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}
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$this->_query("DELETE FROM cache WHERE id='$id'");
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$sql = "INSERT INTO cache (id, content, lastModified, expire) VALUES ('$id', '$data', $mktime, $expire)";
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$res = $this->_query($sql);
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if (!$res) {
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$this->_log("Zend_Cache_Backend_Sqlite::save() : impossible to store the cache id=$id");
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return false;
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}
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$res = true;
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foreach ($tags as $tag) {
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$res = $this->_registerTag($id, $tag) && $res;
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}
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return $res;
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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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$this->_checkAndBuildStructure();
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$res = $this->_query("SELECT COUNT(*) AS nbr FROM cache WHERE id='$id'");
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$result1 = @sqlite_fetch_single($res);
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$result2 = $this->_query("DELETE FROM cache WHERE id='$id'");
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$result3 = $this->_query("DELETE FROM tag WHERE id='$id'");
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$this->_automaticVacuum();
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return ($result1 && $result2 && $result3);
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}
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/**
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* Clean some cache records
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*
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* Available modes are :
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* Zend_Cache::CLEANING_MODE_ALL (default) => remove all cache entries ($tags is not used)
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* Zend_Cache::CLEANING_MODE_OLD => remove too old cache entries ($tags is not used)
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* Zend_Cache::CLEANING_MODE_MATCHING_TAG => remove cache entries matching all given tags
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* ($tags can be an array of strings or a single string)
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* Zend_Cache::CLEANING_MODE_NOT_MATCHING_TAG => remove cache entries not {matching one of the given tags}
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* ($tags can be an array of strings or a single string)
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* Zend_Cache::CLEANING_MODE_MATCHING_ANY_TAG => remove cache entries matching any given tags
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* ($tags can be an array of strings or a single string)
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*
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* @param string $mode Clean mode
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* @param array $tags Array of tags
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* @return boolean True if no problem
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*/
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public function clean($mode = Zend_Cache::CLEANING_MODE_ALL, $tags = array())
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{
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$this->_checkAndBuildStructure();
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$return = $this->_clean($mode, $tags);
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$this->_automaticVacuum();
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return $return;
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}
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/**
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* Return an array of stored cache ids
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*
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* @return array array of stored cache ids (string)
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*/
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public function getIds()
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{
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$this->_checkAndBuildStructure();
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$res = $this->_query("SELECT id FROM cache WHERE (expire=0 OR expire>" . time() . ")");
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$result = array();
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while ($id = @sqlite_fetch_single($res)) {
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$result[] = $id;
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}
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return $result;
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}
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/**
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* Return an array of stored tags
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*
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* @return array array of stored tags (string)
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*/
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public function getTags()
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{
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$this->_checkAndBuildStructure();
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$res = $this->_query("SELECT DISTINCT(name) AS name FROM tag");
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$result = array();
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while ($id = @sqlite_fetch_single($res)) {
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$result[] = $id;
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}
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return $result;
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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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$first = true;
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$ids = array();
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foreach ($tags as $tag) {
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$res = $this->_query("SELECT DISTINCT(id) AS id FROM tag WHERE name='$tag'");
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if (!$res) {
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return array();
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}
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$rows = @sqlite_fetch_all($res, SQLITE_ASSOC);
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$ids2 = array();
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foreach ($rows as $row) {
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$ids2[] = $row['id'];
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}
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if ($first) {
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$ids = $ids2;
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$first = false;
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} else {
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$ids = array_intersect($ids, $ids2);
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}
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}
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$result = array();
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foreach ($ids as $id) {
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$result[] = $id;
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}
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return $result;
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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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$res = $this->_query("SELECT id FROM cache");
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$rows = @sqlite_fetch_all($res, SQLITE_ASSOC);
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$result = array();
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foreach ($rows as $row) {
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$id = $row['id'];
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$matching = false;
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foreach ($tags as $tag) {
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$res = $this->_query("SELECT COUNT(*) AS nbr FROM tag WHERE name='$tag' AND id='$id'");
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if (!$res) {
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return array();
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}
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$nbr = (int) @sqlite_fetch_single($res);
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if ($nbr > 0) {
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$matching = true;
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}
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}
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if (!$matching) {
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$result[] = $id;
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}
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}
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return $result;
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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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$first = true;
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$ids = array();
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foreach ($tags as $tag) {
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$res = $this->_query("SELECT DISTINCT(id) AS id FROM tag WHERE name='$tag'");
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if (!$res) {
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return array();
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}
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$rows = @sqlite_fetch_all($res, SQLITE_ASSOC);
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$ids2 = array();
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foreach ($rows as $row) {
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$ids2[] = $row['id'];
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}
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if ($first) {
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$ids = $ids2;
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$first = false;
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} else {
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$ids = array_merge($ids, $ids2);
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}
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}
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$result = array();
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foreach ($ids as $id) {
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$result[] = $id;
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}
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return $result;
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}
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/**
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* Return the filling percentage of the backend storage
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*
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* @throws Zend_Cache_Exception
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* @return int integer between 0 and 100
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*/
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public function getFillingPercentage()
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{
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$dir = dirname($this->_options['cache_db_complete_path']);
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$free = disk_free_space($dir);
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$total = disk_total_space($dir);
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if ($total == 0) {
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Zend_Cache::throwException('can\'t get disk_total_space');
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} else {
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if ($free >= $total) {
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return 100;
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}
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return ((int) (100. * ($total - $free) / $total));
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}
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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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$tags = array();
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$res = $this->_query("SELECT name FROM tag WHERE id='$id'");
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if ($res) {
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$rows = @sqlite_fetch_all($res, SQLITE_ASSOC);
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foreach ($rows as $row) {
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$tags[] = $row['name'];
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}
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}
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$this->_query('CREATE TABLE cache (id TEXT PRIMARY KEY, content BLOB, lastModified INTEGER, expire INTEGER)');
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$res = $this->_query("SELECT lastModified,expire FROM cache WHERE id='$id'");
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if (!$res) {
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return false;
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}
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$row = @sqlite_fetch_array($res, SQLITE_ASSOC);
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return array(
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'tags' => $tags,
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'mtime' => $row['lastModified'],
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'expire' => $row['expire']
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);
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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, $extraLifetime)
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{
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$sql = "SELECT expire FROM cache WHERE id='$id' AND (expire=0 OR expire>" . time() . ')';
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$res = $this->_query($sql);
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if (!$res) {
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return false;
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}
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$expire = @sqlite_fetch_single($res);
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$newExpire = $expire + $extraLifetime;
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$res = $this->_query("UPDATE cache SET lastModified=" . time() . ", expire=$newExpire WHERE id='$id'");
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if ($res) {
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return true;
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} else {
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return false;
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}
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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' => true,
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'tags' => true,
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'expired_read' => true,
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'priority' => false,
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'infinite_lifetime' => true,
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'get_list' => true
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);
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}
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/**
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* PUBLIC METHOD FOR UNIT TESTING ONLY !
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*
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* Force a cache record to expire
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*
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* @param string $id Cache id
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*/
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public function ___expire($id)
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{
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$time = time() - 1;
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$this->_query("UPDATE cache SET lastModified=$time, expire=$time WHERE id='$id'");
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}
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/**
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* Return the connection resource
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*
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* If we are not connected, the connection is made
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*
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* @throws Zend_Cache_Exception
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* @return resource Connection resource
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*/
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private function _getConnection()
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{
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if (is_resource($this->_db)) {
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return $this->_db;
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} else {
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$this->_db = @sqlite_open($this->_options['cache_db_complete_path']);
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if (!(is_resource($this->_db))) {
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Zend_Cache::throwException("Impossible to open " . $this->_options['cache_db_complete_path'] . " cache DB file");
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}
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return $this->_db;
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}
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}
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/**
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* Execute an SQL query silently
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*
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* @param string $query SQL query
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* @return mixed|false query results
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*/
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private function _query($query)
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{
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$db = $this->_getConnection();
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if (is_resource($db)) {
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$res = @sqlite_query($db, $query);
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if ($res === false) {
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return false;
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} else {
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return $res;
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}
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}
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return false;
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}
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|
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/**
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* Deal with the automatic vacuum process
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*
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* @return void
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*/
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private function _automaticVacuum()
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{
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if ($this->_options['automatic_vacuum_factor'] > 0) {
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$rand = rand(1, $this->_options['automatic_vacuum_factor']);
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if ($rand == 1) {
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$this->_query('VACUUM');
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@sqlite_close($this->_getConnection());
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}
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}
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}
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/**
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* Register a cache id with the given tag
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*
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* @param string $id Cache id
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* @param string $tag Tag
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* @return boolean True if no problem
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*/
|
|
private function _registerTag($id, $tag) {
|
|
$res = $this->_query("DELETE FROM TAG WHERE name='$tag' AND id='$id'");
|
|
$res = $this->_query("INSERT INTO tag (name, id) VALUES ('$tag', '$id')");
|
|
if (!$res) {
|
|
$this->_log("Zend_Cache_Backend_Sqlite::_registerTag() : impossible to register tag=$tag on id=$id");
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Build the database structure
|
|
*
|
|
* @return false
|
|
*/
|
|
private function _buildStructure()
|
|
{
|
|
$this->_query('DROP INDEX tag_id_index');
|
|
$this->_query('DROP INDEX tag_name_index');
|
|
$this->_query('DROP INDEX cache_id_expire_index');
|
|
$this->_query('DROP TABLE version');
|
|
$this->_query('DROP TABLE cache');
|
|
$this->_query('DROP TABLE tag');
|
|
$this->_query('CREATE TABLE version (num INTEGER PRIMARY KEY)');
|
|
$this->_query('CREATE TABLE cache (id TEXT PRIMARY KEY, content BLOB, lastModified INTEGER, expire INTEGER)');
|
|
$this->_query('CREATE TABLE tag (name TEXT, id TEXT)');
|
|
$this->_query('CREATE INDEX tag_id_index ON tag(id)');
|
|
$this->_query('CREATE INDEX tag_name_index ON tag(name)');
|
|
$this->_query('CREATE INDEX cache_id_expire_index ON cache(id, expire)');
|
|
$this->_query('INSERT INTO version (num) VALUES (1)');
|
|
}
|
|
|
|
/**
|
|
* Check if the database structure is ok (with the good version)
|
|
*
|
|
* @return boolean True if ok
|
|
*/
|
|
private function _checkStructureVersion()
|
|
{
|
|
$result = $this->_query("SELECT num FROM version");
|
|
if (!$result) return false;
|
|
$row = @sqlite_fetch_array($result);
|
|
if (!$row) {
|
|
return false;
|
|
}
|
|
if (((int) $row['num']) != 1) {
|
|
// old cache structure
|
|
$this->_log('Zend_Cache_Backend_Sqlite::_checkStructureVersion() : old cache structure version detected => the cache is going to be dropped');
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Clean some cache records
|
|
*
|
|
* Available modes are :
|
|
* Zend_Cache::CLEANING_MODE_ALL (default) => remove all cache entries ($tags is not used)
|
|
* Zend_Cache::CLEANING_MODE_OLD => remove too old cache entries ($tags is not used)
|
|
* Zend_Cache::CLEANING_MODE_MATCHING_TAG => remove cache entries matching all given tags
|
|
* ($tags can be an array of strings or a single string)
|
|
* Zend_Cache::CLEANING_MODE_NOT_MATCHING_TAG => remove cache entries not {matching one of the given tags}
|
|
* ($tags can be an array of strings or a single string)
|
|
* Zend_Cache::CLEANING_MODE_MATCHING_ANY_TAG => remove cache entries matching any given tags
|
|
* ($tags can be an array of strings or a single string)
|
|
*
|
|
* @param string $mode Clean mode
|
|
* @param array $tags Array of tags
|
|
* @return boolean True if no problem
|
|
*/
|
|
private function _clean($mode = Zend_Cache::CLEANING_MODE_ALL, $tags = array())
|
|
{
|
|
switch ($mode) {
|
|
case Zend_Cache::CLEANING_MODE_ALL:
|
|
$res1 = $this->_query('DELETE FROM cache');
|
|
$res2 = $this->_query('DELETE FROM tag');
|
|
return $res1 && $res2;
|
|
break;
|
|
case Zend_Cache::CLEANING_MODE_OLD:
|
|
$mktime = time();
|
|
$res1 = $this->_query("DELETE FROM tag WHERE id IN (SELECT id FROM cache WHERE expire>0 AND expire<=$mktime)");
|
|
$res2 = $this->_query("DELETE FROM cache WHERE expire>0 AND expire<=$mktime");
|
|
return $res1 && $res2;
|
|
break;
|
|
case Zend_Cache::CLEANING_MODE_MATCHING_TAG:
|
|
$ids = $this->getIdsMatchingTags($tags);
|
|
$result = true;
|
|
foreach ($ids as $id) {
|
|
$result = $this->remove($id) && $result;
|
|
}
|
|
return $result;
|
|
break;
|
|
case Zend_Cache::CLEANING_MODE_NOT_MATCHING_TAG:
|
|
$ids = $this->getIdsNotMatchingTags($tags);
|
|
$result = true;
|
|
foreach ($ids as $id) {
|
|
$result = $this->remove($id) && $result;
|
|
}
|
|
return $result;
|
|
break;
|
|
case Zend_Cache::CLEANING_MODE_MATCHING_ANY_TAG:
|
|
$ids = $this->getIdsMatchingAnyTags($tags);
|
|
$result = true;
|
|
foreach ($ids as $id) {
|
|
$result = $this->remove($id) && $result;
|
|
}
|
|
return $result;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Check if the database structure is ok (with the good version), if no : build it
|
|
*
|
|
* @throws Zend_Cache_Exception
|
|
* @return boolean True if ok
|
|
*/
|
|
private function _checkAndBuildStructure()
|
|
{
|
|
if (!($this->_structureChecked)) {
|
|
if (!$this->_checkStructureVersion()) {
|
|
$this->_buildStructure();
|
|
if (!$this->_checkStructureVersion()) {
|
|
Zend_Cache::throwException("Impossible to build cache structure in " . $this->_options['cache_db_complete_path']);
|
|
}
|
|
}
|
|
$this->_structureChecked = true;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
}
|