mirror of
https://github.com/Piwigo/Piwigo.git
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128 lines
No EOL
3 KiB
PHP
128 lines
No EOL
3 KiB
PHP
<?php
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// +-----------------------------------------------------------------------+
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// | This file is part of Piwigo. |
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// | |
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// | For copyright and license information, please view the COPYING.txt |
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// | file that was distributed with this source code. |
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// +-----------------------------------------------------------------------+
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/**
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Provides a persistent cache mechanism across multiple page loads/sessions etc...
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*/
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abstract class PersistentCache
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{
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var $default_lifetime = 86400;
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protected $instance_key = PHPWG_VERSION;
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/**
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@return a key that can be safely be used with get/set methods
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*/
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function make_key($key)
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{
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if ( is_array($key) )
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{
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$key = implode('&', $key);
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}
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$key .= $this->instance_key;
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return md5($key);
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}
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/**
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Searches for a key in the persistent cache and fills corresponding value.
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@param string $key
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@param out mixed $value
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@return false if the $key is not found in cache ($value is not modified in this case)
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*/
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abstract function get($key, &$value);
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/**
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Sets a key/value pair in the persistent cache.
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@param string $key - it should be the return value of make_key function
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@param mixed $value
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@param int $lifetime
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@return false on error
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*/
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abstract function set($key, $value, $lifetime=null);
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/**
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Purge the persistent cache.
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@param boolean $all - if false only expired items will be purged
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*/
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abstract function purge($all);
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}
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/**
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Implementation of a persistent cache using files.
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*/
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class PersistentFileCache extends PersistentCache
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{
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private $dir;
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function __construct()
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{
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global $conf;
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$this->dir = PHPWG_ROOT_PATH.$conf['data_location'].'cache/';
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}
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function get($key, &$value)
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{
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$loaded = @file_get_contents($this->dir.$key.'.cache');
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if ($loaded !== false && ($loaded=unserialize($loaded)) !== false)
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{
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if ($loaded['expire'] > time())
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{
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$value = $loaded['data'];
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return true;
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}
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}
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return false;
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}
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function set($key, $value, $lifetime=null)
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{
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if ($lifetime === null)
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{
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$lifetime = $this->default_lifetime;
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}
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if (rand() % 97 == 0)
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{
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$this->purge(false);
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}
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$serialized = serialize( array(
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'expire' => time() + $lifetime,
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'data' => $value
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));
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if (false === @file_put_contents($this->dir.$key.'.cache', $serialized))
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{
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mkgetdir($this->dir, MKGETDIR_DEFAULT&~MKGETDIR_DIE_ON_ERROR);
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if (false === @file_put_contents($this->dir.$key.'.cache', $serialized))
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{
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return false;
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}
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}
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return true;
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}
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function purge($all)
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{
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$files = glob($this->dir.'*.cache');
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if (empty($files))
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{
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return;
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}
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$limit = time() - $this->default_lifetime;
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foreach ($files as $file)
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{
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if ($all || @filemtime($file) < $limit)
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@unlink($file);
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}
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}
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}
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?>
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