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<?php |
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/** |
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* @package CleverStyle Framework |
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* @author Nazar Mokrynskyi <[email protected]> |
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* @copyright Copyright (c) 2011-2016, Nazar Mokrynskyi |
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* @license MIT License, see license.txt |
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*/ |
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namespace cs\Cache; |
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/** |
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* Provides cache functionality based on file system structure. |
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*/ |
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class FileSystem extends _Abstract { |
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/** |
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* Like realpath() but works even if files does not exists |
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* |
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* @param string $path |
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* |
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* @return string |
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*/ |
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protected function get_absolute_path ($path) { |
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$path = str_replace(['/', '\\'], '/', $path); |
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$parts = array_filter(explode('/', $path), 'strlen'); |
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$absolutes = []; |
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foreach ($parts as $part) { |
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if ('.' == $part) { |
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continue; |
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} |
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if ('..' == $part) { |
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array_pop($absolutes); |
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} else { |
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$absolutes[] = $part; |
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} |
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} |
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return CACHE.'/'.implode('/', $absolutes); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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function get ($item) { |
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$path_in_filesystem = $this->get_absolute_path($item); |
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if ( |
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strpos($path_in_filesystem, CACHE) !== 0 || |
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!is_file($path_in_filesystem) |
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) { |
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return false; |
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} |
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$cache = file_get_contents($path_in_filesystem); |
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$cache = _json_decode($cache); |
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if ($cache !== false) { |
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return $cache; |
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} |
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unlink($path_in_filesystem); |
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return false; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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function set ($item, $data) { |
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$path_in_filesystem = $this->get_absolute_path($item); |
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if (strpos($path_in_filesystem, CACHE) !== 0) { |
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return false; |
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} |
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$data = _json_encode($data); |
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if (mb_strpos($item, '/') !== false) { |
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$path = mb_substr($item, 0, mb_strrpos($item, '/')); |
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if (!is_dir(CACHE."/$path")) { |
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/** @noinspection MkdirRaceConditionInspection */ |
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@mkdir(CACHE."/$path", 0770, true); |
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} |
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unset($path); |
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} |
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if (!file_exists($path_in_filesystem) || is_writable($path_in_filesystem)) { |
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return (bool)file_put_contents($path_in_filesystem, $data, LOCK_EX | FILE_BINARY); |
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} |
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trigger_error("File $path_in_filesystem not available for writing", E_USER_WARNING); |
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return false; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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function del ($item) { |
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$path_in_filesystem = $this->get_absolute_path($item); |
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if (strpos($path_in_filesystem, CACHE) !== 0) { |
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return false; |
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} |
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if (is_dir($path_in_filesystem)) { |
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/** |
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* Rename to random name in order to immediately invalidate nested elements, actual deletion done right after this |
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*/ |
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$new_path = $path_in_filesystem.md5(random_bytes(1000)); |
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/** |
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* Sometimes concurrent deletion might happen, so we need to silent error and actually remove directory only when renaming was successful |
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*/ |
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return @rename($path_in_filesystem, $new_path) ? rmdir_recursive($new_path) : !is_dir($path_in_filesystem); |
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} |
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return file_exists($path_in_filesystem) ? @unlink($path_in_filesystem) : true; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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function clean () { |
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$ok = true; |
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$dirs_to_rm = []; |
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/** |
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* Remove root files and rename root directories for instant cache cleaning |
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*/ |
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$random_key = md5(random_bytes(1000)); |
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get_files_list( |
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CACHE, |
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false, |
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'fd', |
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true, |
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false, |
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false, |
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false, |
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true, |
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function ($item) use (&$ok, &$dirs_to_rm, $random_key) { |
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if (is_writable($item)) { |
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if (is_dir($item)) { |
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rename($item, "$item$random_key"); |
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$dirs_to_rm[] = "$item$random_key"; |
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} else { |
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@unlink($item); |
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} |
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} else { |
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$ok = false; |
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} |
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2 |
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} |
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); |
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/** |
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* Then remove all renamed directories |
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*/ |
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2 |
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foreach ($dirs_to_rm as $dir) { |
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$ok = rmdir_recursive($dir) && $ok; |
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} |
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return $ok; |
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} |
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} |
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nazar-pc /
CleverStyle-Framework
