add($key, $data, $flag, $expire); } function wp_cache_close() { global $wp_object_cache; 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 $wp_object_cache; } function wp_cache_get($id, $flag = '') { global $wp_object_cache; return $wp_object_cache->get($id, $flag); } function wp_cache_init() { global $wp_object_cache; $wp_object_cache = new WP_Object_Cache(); } function wp_cache_replace($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 $use_flock = false; var $flock_filename = 'wp_object_cache.lock'; var $sem_id = 5454; var $mutex; var $cache = array (); var $dirty_objects = array (); var $global_groups = array('users', 'usermeta'); var $blog_id; var $cold_cache_hits = 0; var $warm_cache_hits = 0; var $cache_misses = 0; function add($id, $data, $group = 'default', $expire = '') { if ( empty($group) ) $group = 'default'; if (isset ($this->cache[$group][$id])) return false; return $this->set($id, $data, $group, $expire); } function delete($id, $group = 'default') { if ( empty($group) ) $group = 'default'; if (!isset ($this->cache[$group][$id])) return false; unset ($this->cache[$group][$id]); $this->dirty_objects[$group][] = $id; return true; } function get($id, $group = 'default') { if ( empty($group) ) $group = 'default'; if (isset ($this->cache[$group][$id])) { $this->warm_cache_hits += 1; return $this->cache[$group][$id]; } // If caching is not enabled, we have to fall back to pulling from the DB. if (!$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->cache_misses += 1; return false; } $cache_file = $this->cache_dir . $this->get_group_dir($group) . "/" . md5($id . DB_PASSWORD) . '.php'; if (!file_exists($cache_file)) { $this->cache_misses += 1; return false; } $this->cache[$group][$id] = unserialize(substr(@ file_get_contents($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}/$group"; } function load_group_from_db($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] = $catt; foreach ($this->cache['category'] as $catt) { $curcat = $catt->cat_ID; $fullpath = '/'.$this->cache['category'][$catt->cat_ID]->category_nicename; while ($this->cache['category'][$curcat]->category_parent != 0) { $curcat = $this->cache['category'][$curcat]->category_parent; $fullpath = '/'.$this->cache['category'][$curcat]->category_nicename.$fullpath; } $this->cache['category'][$catt->cat_ID]->fullpath = $fullpath; } } } 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"); } $wpdb->show_errors(); foreach ($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 . $make_dir . "index.php")) { touch($this->cache_dir . $make_dir . "index.php"); } } return $this->cache_dir . "$group_dir/"; } function replace($id, $data, $group = 'default', $expire = '') { if ( empty($group) ) $group = 'default'; if (!isset ($this->cache[$group][$id])) return false; return $this->set($id, $data, $group, $expire); } function set($id, $data, $group = 'default', $expire = '') { if ( empty($group) ) $group = 'default'; $this->cache[$group][$id] = $data; $this->dirty_objects[$group][] = $id; return true; } function save() { //$this->stats(); if (!$this->cache_enabled) return; if (empty ($this->dirty_objects)) return; // Give the new dirs the same perms as wp-content. $stat = stat(ABSPATH.'wp-content'); $dir_perms = $stat['mode'] & 0000777; // Get the permission bits. // Make the base cache dir. if (!file_exists($this->cache_dir)) { if (!mkdir($this->cache_dir)) return; @ chmod($this->cache_dir, $dir_perms); } if (!file_exists($this->cache_dir . "index.php")) { touch($this->cache_dir . "index.php"); } // Acquire a write lock. Semaphore preferred. Fallback to flock. if (function_exists('sem_get')) { $this->use_flock = false; $mutex = sem_get($this->sem_id, 1, 0644 | IPC_CREAT, 1); sem_acquire($mutex); } else { $this->use_flock = true; $mutex = fopen($this->cache_dir.$this->flock_filename, 'w'); flock($mutex, LOCK_EX); } // Loop over dirty objects and save them. foreach ($this->dirty_objects as $group => $ids) { $group_dir = $this->make_group_dir($group, $dir_perms); $ids = array_unique($ids); foreach ($ids as $id) { // TODO: If the id is no longer in the cache, it was deleted and // the file should be removed. $cache_file = $group_dir . md5($id . DB_PASSWORD) . '.php'; $temp_file = tempnam($group_dir, 'tmp'); $serial = CACHE_SERIAL_HEADER . serialize($this->cache[$group][$id]) . CACHE_SERIAL_FOOTER; $fd = fopen($temp_file, 'w'); fputs($fd, $serial); fclose($fd); if (!@rename($temp_file, $cache_file)) { if (copy ($temp_file, $cache_file)) { unlink($temp_file); } } } } // Release write lock. if ($this->use_flock) flock($mutex, LOCK_UN); else sem_release($mutex); } 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() { global $blog_id; if ( defined('DISABLE_CACHE') ) return; if ( defined('CACHE_PATH') ) $this->cache_dir = CACHE_PATH; else $this->cache_dir = ABSPATH.'wp-content/cache/'; if ( is_dir($this->cache_dir) ) { if ( is_writable($this->cache_dir) ) $this->cache_enabled = true; } else if (is_writable(ABSPATH.'wp-content')) { $this->cache_enabled = true; } $this->blog_id = md5($blog_id); } } ?>