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<?php
/**
* ElggFileCache
* Store cached data in a file store.
*
* @package Elgg
* @subpackage API
*/
class ElggFileCache extends ElggCache {
/**
* Set the Elgg cache.
*
* @param string $cache_path The cache path.
* @param int $max_age Maximum age in seconds, 0 if no limit.
* @param int $max_size Maximum size of cache in seconds, 0 if no limit.
*/
function __construct($cache_path, $max_age = 0, $max_size = 0) {
$this->set_variable("cache_path", $cache_path);
$this->set_variable("max_age", $max_age);
$this->set_variable("max_size", $max_size);
if ($cache_path=="") {
throw new ConfigurationException(elgg_echo('ConfigurationException:NoCachePath'));
}
}
/**
* Create and return a handle to a file.
*
* @param string $filename
* @param string $rw
*/
protected function create_file($filename, $rw = "rb") {
// Create a filename matrix
$matrix = "";
$depth = strlen($filename);
if ($depth > 5) {
$depth = 5;
}
// Create full path
$path = $this->get_variable("cache_path") . $matrix;
if (!is_dir($path)) {
mkdir($path, 0700, true);
}
// Open the file
if ((!file_exists($path . $filename)) && ($rw=="rb")) {
return false;
}
return fopen($path . $filename, $rw);
}
/**
* Create a sanitised filename for the file.
*
* @param string $filename
*/
protected function sanitise_filename($filename) {
// @todo : Writeme
return $filename;
}
/**
* Save a key
*
* @param string $key
* @param string $data
* @return boolean
*/
public function save($key, $data) {
$f = $this->create_file($this->sanitise_filename($key), "wb");
if ($f) {
$result = fwrite($f, $data);
fclose($f);
return $result;
}
return false;
}
/**
* Load a key
*
* @param string $key
* @param int $offset
* @param int $limit
* @return string
*/
public function load($key, $offset = 0, $limit = null) {
$f = $this->create_file($this->sanitise_filename($key));
if ($f) {
//fseek($f, $offset);
if (!$limit) {
$limit = -1;
}
$data = stream_get_contents($f, $limit, $offset);
fclose($f);
return $data;
}
return false;
}
/**
* Invalidate a given key.
*
* @param string $key
* @return bool
*/
public function delete($key) {
$dir = $this->get_variable("cache_path");
if (file_exists($dir.$key)) {
return unlink($dir.$key);
}
return TRUE;
}
public function clear() {
// @todo writeme
}
public function __destruct() {
// @todo Check size and age, clean up accordingly
$size = 0;
$dir = $this->get_variable("cache_path");
// Short circuit if both size and age are unlimited
if (($this->get_variable("max_age")==0) && ($this->get_variable("max_size")==0)) {
return;
}
$exclude = array(".","..");
$files = scandir($dir);
if (!$files) {
throw new IOException(sprintf(elgg_echo('IOException:NotDirectory'), $dir));
}
// Perform cleanup
foreach ($files as $f) {
if (!in_array($f, $exclude)) {
$stat = stat($dir.$f);
// Add size
$size .= $stat['size'];
// Is this older than my maximum date?
if (($this->get_variable("max_age")>0) && (time() - $stat['mtime'] > $this->get_variable("max_age"))) {
unlink($dir.$f);
}
// @todo Size
}
}
}
}
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