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<?php |
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/** |
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* Simple Machines Forum (SMF) |
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* |
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* @package SMF |
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* @author Simple Machines http://www.simplemachines.org |
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* @copyright 2019 Simple Machines and individual contributors |
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* @license http://www.simplemachines.org/about/smf/license.php BSD |
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* |
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* @version 2.1 RC2 |
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*/ |
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if (!defined('SMF')) |
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die('Hacking attempt...'); |
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/** |
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* Our Cache API class |
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* |
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* @package cacheAPI |
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*/ |
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class smf_cache extends cache_api |
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{ |
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/** |
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* @var string The path to the current $cachedir directory. |
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*/ |
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private $cachedir = null; |
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/** |
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* {@inheritDoc} |
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*/ |
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public function __construct() |
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{ |
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parent::__construct(); |
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// Set our default cachedir. |
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$this->setCachedir(); |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function isSupported($test = false) |
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{ |
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$supported = is_writable($this->cachedir); |
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if ($test) |
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return $supported; |
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return parent::isSupported() && $supported; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function getData($key, $ttl = null) |
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{ |
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$key = $this->prefix . strtr($key, ':/', '-_'); |
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$cachedir = $this->cachedir; |
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// SMF Data returns $value and $expired. $expired has a unix timestamp of when this expires. |
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if (file_exists($cachedir . '/data_' . $key . '.php') && filesize($cachedir . '/data_' . $key . '.php') > 10) |
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{ |
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// Work around Zend's opcode caching (PHP 5.5+), they would cache older files for a couple of seconds |
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// causing newer files to take effect a while later. |
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if (function_exists('opcache_invalidate')) |
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opcache_invalidate($cachedir . '/data_' . $key . '.php', true); |
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if (function_exists('apc_delete_file')) |
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@apc_delete_file($cachedir . '/data_' . $key . '.php'); |
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// php will cache file_exists et all, we can't 100% depend on its results so proceed with caution |
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@include($cachedir . '/data_' . $key . '.php'); |
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if (!empty($expired) && isset($value)) |
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{ |
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@unlink($cachedir . '/data_' . $key . '.php'); |
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unset($value); |
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} |
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} |
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return !empty($value) ? $value : null; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function putData($key, $value, $ttl = null) |
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{ |
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$key = $this->prefix . strtr($key, ':/', '-_'); |
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$cachedir = $this->cachedir; |
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// Work around Zend's opcode caching (PHP 5.5+), they would cache older files for a couple of seconds |
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// causing newer files to take effect a while later. |
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if (function_exists('opcache_invalidate')) |
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opcache_invalidate($cachedir . '/data_' . $key . '.php', true); |
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if (function_exists('apc_delete_file')) |
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@apc_delete_file($cachedir . '/data_' . $key . '.php'); |
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// Otherwise custom cache? |
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if ($value === null) |
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@unlink($cachedir . '/data_' . $key . '.php'); |
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else |
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{ |
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$cache_data = '<' . '?' . 'php if (!defined(\'SMF\')) die; if (' . (time() + $ttl) . ' < time()) $expired = true; else{$expired = false; $value = \'' . addcslashes($value, "\0" . '\\\'') . '\';}' . '?' . '>'; |
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// Write out the cache file, check that the cache write was successful; all the data must be written |
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// If it fails due to low diskspace, or other, remove the cache file |
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$fileSize = file_put_contents($cachedir . '/data_' . $key . '.php', $cache_data, LOCK_EX); |
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if ($fileSize !== strlen($cache_data)) |
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{ |
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@unlink($cachedir . '/data_' . $key . '.php'); |
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return false; |
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} |
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else |
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return true; |
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} |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function cleanCache($type = '') |
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{ |
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$cachedir = $this->cachedir; |
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// No directory = no game. |
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if (!is_dir($cachedir)) |
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return; |
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// Remove the files in SMF's own disk cache, if any |
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$dh = opendir($cachedir); |
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while ($file = readdir($dh)) |
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{ |
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if ($file != '.' && $file != '..' && $file != 'index.php' && $file != '.htaccess' && (!$type || substr($file, 0, strlen($type)) == $type)) |
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@unlink($cachedir . '/' . $file); |
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} |
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closedir($dh); |
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// Make this invalid. |
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$this->invalidateCache(); |
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return true; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function invalidateCache() |
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{ |
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// We don't worry about $cachedir here, since the key is based on the real $cachedir. |
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parent::invalidateCache(); |
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// Since SMF is file based, be sure to clear the statcache. |
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clearstatcache(); |
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return true; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function cacheSettings(array &$config_vars) |
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{ |
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global $context, $txt; |
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$config_vars[] = $txt['cache_smf_settings']; |
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$config_vars[] = array('cachedir', $txt['cachedir'], 'file', 'text', 36, 'cache_cachedir'); |
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if (!isset($context['settings_post_javascript'])) |
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$context['settings_post_javascript'] = ''; |
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$context['settings_post_javascript'] .= ' |
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$("#cache_accelerator").change(function (e) { |
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var cache_type = e.currentTarget.value; |
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$("#cachedir").prop("disabled", cache_type != "smf"); |
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});'; |
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} |
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/** |
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* Sets the $cachedir or uses the SMF default $cachedir.. |
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* |
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* @access public |
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* @param string $dir A valid path |
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* @return boolean If this was successful or not. |
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*/ |
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public function setCachedir($dir = null) |
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{ |
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global $cachedir; |
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// If its invalid, use SMF's. |
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if (is_null($dir) || !is_writable($dir)) |
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$this->cachedir = $cachedir; |
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else |
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$this->cachedir = $dir; |
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} |
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/** |
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* Gets the current $cachedir. |
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* |
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* @access public |
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* @return string the value of $ttl. |
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*/ |
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public function getCachedir() |
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{ |
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return $this->cachedir; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function getVersion() |
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{ |
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return SMF_VERSION; |
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} |
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} |
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?> |
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