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egroupware_official/phpgwapi/inc/class.egw_cache_files.inc.php

149 lines
4.0 KiB
PHP

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