mirror of
https://github.com/EGroupware/egroupware.git
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135 lines
3.4 KiB
PHP
135 lines
3.4 KiB
PHP
<?php
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/**
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* eGroupWare API: Caching provider storing data to files
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*
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* @link http://www.egroupware.org
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* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
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* @package api
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* @subpackage cache
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* @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
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* @copyright (c) 2009 by Ralf Becker <RalfBecker-AT-outdoor-training.de>
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* @version $Id$
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*/
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/**
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* Caching provider storing data in files
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*
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* The provider creates subdirs under a given path
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* for each values in $key
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*/
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class egw_cache_files implements egw_cache_provider
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{
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/**
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* Extension of file used to store expiration > 0
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*/
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const EXPIRATION_EXTENSION = '.expiration';
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/**
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* Path of base-directory for the cache, set via parameter to the constructor or defaults to temp_dir
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*
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* @var string
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*/
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protected $base_path;
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/**
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* Constructor, eg. opens the connection to the backend
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*
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* @throws Exception if connection to backend could not be established
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* @param array $params eg. array(host,port) or array(directory) depending on the provider
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*/
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function __construct(array $params)
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{
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if ($params)
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{
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$this->base_path = $params[0];
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}
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else
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{
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$this->base_path = egw_cache::get_system_config('temp_dir').'/egw_cache';
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}
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if (!isset($this->base_path) || !file_exists($this->base_path) && !mkdir($this->base_path,0700,true))
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{
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throw new Exception (__METHOD__."() can't create basepath $this->base_path!");
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}
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}
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/**
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* Stores some data in the cache
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*
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* @param array $keys eg. array($level,$app,$location)
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* @param mixed $data
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* @param int $expiration=0
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* @return boolean true on success, false on error
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*/
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function set(array $keys,$data,$expiration=0)
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{
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if ($ret = @file_put_contents($fname=$this->filename($keys,true),serialize($data),LOCK_EX) > 0)
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{
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if ((int)$expiration > 0) file_put_contents($fname.self::EXPIRATION_EXTENSION,(string)$expiration);
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}
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return $ret;
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}
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/**
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* Get some data from the cache
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*
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* @param array $keys eg. array($level,$app,$location)
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* @return mixed data stored or NULL if not found in cache
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*/
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function get(array $keys)
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{
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if (!file_exists($fname = $this->filename($keys)))
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{
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return null;
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}
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if (file_exists($fname_expiration=$fname.self::EXPIRATION_EXTENSION) &&
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($expiration = (int)file_get_contents($fname_expiration)) &&
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filemtime($fname) < time()-$expiration)
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{
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unlink($fname);
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unlink($fname_expiration);
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return null;
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}
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return unserialize(file_get_contents($fname));
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}
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/**
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* Delete some data from the cache
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*
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* @param array $keys eg. array($level,$app,$location)
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* @return boolean true on success, false on error (eg. $key not set)
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*/
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function delete(array $keys)
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{
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if (!file_exists($fname = $this->filename($keys)))
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{
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//error_log(__METHOD__.'('.array2string($keys).") file_exists('$fname') == FALSE!");
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return false;
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}
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if (file_exists($fname_expiration=$fname.self::EXPIRATION_EXTENSION))
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{
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unlink($fname_expiration);
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}
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//error_log(__METHOD__.'('.array2string($keys).") calling unlink('$fname')");
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return unlink($fname);
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}
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/**
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* Create a path from $keys and $basepath
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*
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* @param array $keys
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* @param boolean $mkdir=false should we create the directory
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* @return string
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*/
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function filename(array $keys,$mkdir=false)
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{
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$fname = $this->base_path.'/'.str_replace(array(':','*'),'-',implode('/',$keys));
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if ($mkdir && !file_exists($dirname=dirname($fname)))
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{
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@mkdir($dirname,0700,true);
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}
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return $fname;
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}
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}
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