add($key, $data, $flag, $expire); } function wp_cache_close() { global $wp_object_cache; if ( ! isset($wp_object_cache) ) return; return $wp_object_cache->save(); } function wp_cache_delete($id, $flag = '') { global $wp_object_cache; return $wp_object_cache->delete($id, $flag); } function wp_cache_flush() { global $wp_object_cache; return $wp_object_cache->flush(); } function wp_cache_get($id, $flag = '') { global $wp_object_cache; return $wp_object_cache->get($id, $flag); } function wp_cache_init() { $GLOBALS['wp_object_cache'] =& new WP_Object_Cache(); } function wp_cache_replace($key, $data, $flag = '', $expire = 0) { global $wp_object_cache; return $wp_object_cache->replace($key, $data, $flag, $expire); } function wp_cache_set($key, $data, $flag = '', $expire = 0) { global $wp_object_cache; return $wp_object_cache->set($key, $data, $flag, $expire); } define('CACHE_SERIAL_HEADER', ""); class WP_Object_Cache { var $cache_dir; var $cache_enabled = false; var $expiration_time = 900; var $flock_filename = 'wp_object_cache.lock'; var $mutex; var $cache = array (); var $dirty_objects = array (); var $non_existant_objects = array (); var $global_groups = array ('users', 'userlogins', 'usermeta'); var $blog_id; var $cold_cache_hits = 0; var $warm_cache_hits = 0; var $cache_misses = 0; var $secret = ''; function acquire_lock() { // Acquire a write lock. $this->mutex = @fopen($this->cache_dir.$this->flock_filename, 'w'); if ( false == $this->mutex) return false; flock($this->mutex, LOCK_EX); return true; } function add($id, $data, $group = 'default', $expire = '') { if (empty ($group)) $group = 'default'; if (false !== $this->get($id, $group, false)) return false; return $this->set($id, $data, $group, $expire); } function delete($id, $group = 'default', $force = false) { if (empty ($group)) $group = 'default'; if (!$force && false === $this->get($id, $group, false)) return false; unset ($this->cache[$group][$id]); $this->non_existant_objects[$group][$id] = true; $this->dirty_objects[$group][] = $id; return true; } function flush() { if ( !$this->cache_enabled ) return true; if ( ! $this->acquire_lock() ) return false; $this->rm_cache_dir(); $this->cache = array (); $this->dirty_objects = array (); $this->non_existant_objects = array (); $this->release_lock(); return true; } function get($id, $group = 'default', $count_hits = true) { if (empty ($group)) $group = 'default'; if (isset ($this->cache[$group][$id])) { if ($count_hits) $this->warm_cache_hits += 1; return $this->cache[$group][$id]; } if (isset ($this->non_existant_objects[$group][$id])) return false; // If caching is not enabled, we have to fall back to pulling from the DB. if (!$this->cache_enabled) { if (!isset ($this->cache[$group])) $this->load_group_from_db($group); if (isset ($this->cache[$group][$id])) { $this->cold_cache_hits += 1; return $this->cache[$group][$id]; } $this->non_existant_objects[$group][$id] = true; $this->cache_misses += 1; return false; } $cache_file = $this->cache_dir.$this->get_group_dir($group)."/".$this->hash($id).'.php'; if (!file_exists($cache_file)) { $this->non_existant_objects[$group][$id] = true; $this->cache_misses += 1; return false; } // If the object has expired, remove it from the cache and return false to force // a refresh. $now = time(); if ((filemtime($cache_file) + $this->expiration_time) <= $now) { $this->cache_misses += 1; $this->delete($id, $group, true); return false; } $this->cache[$group][$id] = unserialize(base64_decode(substr(@ file_get_contents($cache_file), strlen(CACHE_SERIAL_HEADER), -strlen(CACHE_SERIAL_FOOTER)))); if (false === $this->cache[$group][$id]) $this->cache[$group][$id] = ''; $this->cold_cache_hits += 1; return $this->cache[$group][$id]; } function get_group_dir($group) { if (false !== array_search($group, $this->global_groups)) return $group; return "{$this->blog_id}/$group"; } function hash($data) { if ( function_exists('hash_hmac') ) { return hash_hmac('md5', $data, $this->secret); } else { return md5($data . $this->secret); } } function load_group_from_db($group) { global $wpdb; if ('category' == $group) { $this->cache['category'] = array (); if ($dogs = $wpdb->get_results("SELECT * FROM $wpdb->categories")) { foreach ($dogs as $catt) $this->cache['category'][$catt->cat_ID] = $catt; } } else if ('options' == $group) { $wpdb->hide_errors(); if (!$options = $wpdb->get_results("SELECT option_name, option_value FROM $wpdb->options WHERE autoload = 'yes'")) { $options = $wpdb->get_results("SELECT option_name, option_value FROM $wpdb->options"); } $wpdb->show_errors(); if ( ! $options ) return; foreach ($options as $option) { $this->cache['options'][$option->option_name] = $option->option_value; } } } function make_group_dir($group, $perms) { $group_dir = $this->get_group_dir($group); $make_dir = ''; foreach (split('/', $group_dir) as $subdir) { $make_dir .= "$subdir/"; if (!file_exists($this->cache_dir.$make_dir)) { if (! @ mkdir($this->cache_dir.$make_dir)) break; @ chmod($this->cache_dir.$make_dir, $perms); } if (!file_exists($this->cache_dir.$make_dir."index.php")) { $file_perms = $perms & 0000666; @ touch($this->cache_dir.$make_dir."index.php"); @ chmod($this->cache_dir.$make_dir."index.php", $file_perms); } } return $this->cache_dir."$group_dir/"; } function rm_cache_dir() { $dir = $this->cache_dir; $dir = rtrim($dir, DIRECTORY_SEPARATOR); $top_dir = $dir; $stack = array($dir); $index = 0; while ($index < count($stack)) { # Get indexed directory from stack $dir = $stack[$index]; $dh = @ opendir($dir); if (!$dh) return false; while (($file = @ readdir($dh)) !== false) { if ($file == '.' or $file == '..') continue; if (@ is_dir($dir . DIRECTORY_SEPARATOR . $file)) $stack[] = $dir . DIRECTORY_SEPARATOR . $file; else if (@ is_file($dir . DIRECTORY_SEPARATOR . $file)) @ unlink($dir . DIRECTORY_SEPARATOR . $file); } $index++; } $stack = array_reverse($stack); // Last added dirs are deepest foreach($stack as $dir) { if ( $dir != $top_dir) @ rmdir($dir); } } function release_lock() { // Release write lock. flock($this->mutex, LOCK_UN); fclose($this->mutex); } function replace($id, $data, $group = 'default', $expire = '') { if (empty ($group)) $group = 'default'; if (false === $this->get($id, $group, false)) return false; return $this->set($id, $data, $group, $expire); } function set($id, $data, $group = 'default', $expire = '') { if (empty ($group)) $group = 'default'; if (NULL == $data) $data = ''; $this->cache[$group][$id] = $data; unset ($this->non_existant_objects[$group][$id]); $this->dirty_objects[$group][] = $id; return true; } function save() { //$this->stats(); if (!$this->cache_enabled) return true; if (empty ($this->dirty_objects)) return true; // Give the new dirs the same perms as wp-content. $stat = stat(ABSPATH.'wp-content'); $dir_perms = $stat['mode'] & 0007777; // Get the permission bits. $file_perms = $dir_perms & 0000666; // Remove execute bits for files. // Make the base cache dir. if (!file_exists($this->cache_dir)) { if (! @ mkdir($this->cache_dir)) return false; @ chmod($this->cache_dir, $dir_perms); } if (!file_exists($this->cache_dir."index.php")) { @ touch($this->cache_dir."index.php"); @ chmod($this->cache_dir."index.php", $file_perms); } if ( ! $this->acquire_lock() ) return false; // Loop over dirty objects and save them. $errors = 0; foreach ($this->dirty_objects as $group => $ids) { $group_dir = $this->make_group_dir($group, $dir_perms); $ids = array_unique($ids); foreach ($ids as $id) { $cache_file = $group_dir.$this->hash($id).'.php'; // Remove the cache file if the key is not set. if (!isset ($this->cache[$group][$id])) { if (file_exists($cache_file)) @ unlink($cache_file); continue; } $temp_file = tempnam($group_dir, 'tmp'); $serial = CACHE_SERIAL_HEADER.base64_encode(serialize($this->cache[$group][$id])).CACHE_SERIAL_FOOTER; $fd = @fopen($temp_file, 'w'); if ( false === $fd ) { $errors++; continue; } fputs($fd, $serial); fclose($fd); if (!@ rename($temp_file, $cache_file)) { if (@ copy($temp_file, $cache_file)) @ unlink($temp_file); else $errors++; } @ chmod($cache_file, $file_perms); } } $this->dirty_objects = array(); $this->release_lock(); if ( $errors ) return false; return true; } function stats() { echo "

"; echo "Cold Cache Hits: {$this->cold_cache_hits}
"; echo "Warm Cache Hits: {$this->warm_cache_hits}
"; echo "Cache Misses: {$this->cache_misses}
"; echo "

"; foreach ($this->cache as $group => $cache) { echo "

"; echo "Group: $group
"; echo "Cache:"; echo "

";
			print_r($cache);
			echo "
"; if (isset ($this->dirty_objects[$group])) { echo "Dirty Objects:"; echo "
";
				print_r(array_unique($this->dirty_objects[$group]));
				echo "
"; echo "

"; } } } function WP_Object_Cache() { return $this->__construct(); } function __construct() { global $blog_id; register_shutdown_function(array(&$this, "__destruct")); if (defined('DISABLE_CACHE')) return; if ( ! defined('ENABLE_CACHE') ) return; // Disable the persistent cache if safe_mode is on. if ( ini_get('safe_mode') && ! defined('ENABLE_CACHE') ) return; if (defined('CACHE_PATH')) $this->cache_dir = CACHE_PATH; else // Using the correct separator eliminates some cache flush errors on Windows $this->cache_dir = ABSPATH.'wp-content'.DIRECTORY_SEPARATOR.'cache'.DIRECTORY_SEPARATOR; if (is_writable($this->cache_dir) && is_dir($this->cache_dir)) { $this->cache_enabled = true; } else { if (is_writable(ABSPATH.'wp-content')) { $this->cache_enabled = true; } } if (defined('CACHE_EXPIRATION_TIME')) $this->expiration_time = CACHE_EXPIRATION_TIME; if ( defined('WP_SECRET') ) $this->secret = WP_SECRET; else $this->secret = DB_PASSWORD . DB_USER . DB_NAME . DB_HOST . ABSPATH; $this->blog_id = $this->hash($blog_id); } function __destruct() { $this->save(); return true; } } ?>