/tags/2.0/wp-includes/cache.php
PHP | 373 lines | 171 code | 46 blank | 156 comment | 31 complexity | 10140ee0d9f2b01431a5b40bfc78f6c0 MD5 | raw file
Possible License(s): AGPL-1.0, LGPL-2.0, LGPL-2.1, GPL-2.0
- <?php
- function wp_cache_add($key, $data, $flag = '', $expire = 0) {
- global $wp_object_cache;
- return $wp_object_cache->add($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;
- 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() {
- 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', "<?php\n//");
- define('CACHE_SERIAL_FOOTER', "\n?".">");
- class WP_Object_Cache {
- var $cache_dir;
- var $cache_enabled = false;
- var $expiration_time = 86400;
- var $flock_filename = 'wp_object_cache.lock';
- 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 $cache_misses = 0;
- function add($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;
-
- $this->rm($this->cache_dir.'*');
- $this->cache = array ();
- $this->dirty_objects = array ();
- $this->non_existant_objects = array ();
- return true;
- }
- function get($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($group)."/".md5($id.DB_PASSWORD).'.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][$id] = unserialize(substr(@ file_get_contents($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();
- 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.$make_dir."index.php")) {
- @ touch($this->cache_dir.$make_dir."index.php");
- }
- }
- return $this->cache_dir."$group_dir/";
- }
- function rm($fileglob) {
- if (is_file($fileglob)) {
- return @ unlink($fileglob);
- } else
- if (is_dir($fileglob)) {
- $ok = WP_Object_Cache::rm("$fileglob/*");
- if (!$ok)
- return false;
- return @ rmdir($fileglob);
- } else {
- $matching = glob($fileglob);
- if ($matching === false)
- return true;
- $rcs = array_map(array ('WP_Object_Cache', 'rm'), $matching);
- if (in_array(false, $rcs)) {
- return false;
- }
- }
- return true;
- }
- function replace($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 (!$this->cache_enabled)
- return;
- if (empty ($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.
- $mutex = @fopen($this->cache_dir.$this->flock_filename, 'w');
- if ( false == $mutex)
- return;
- flock($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) {
- $cache_file = $group_dir.md5($id.DB_PASSWORD).'.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');
- $serial = CACHE_SERIAL_HEADER.serialize($this->cache[$group][$id]).CACHE_SERIAL_FOOTER;
- $fd = @fopen($temp_file, 'w');
- if ( false === $fd )
- continue;
- fputs($fd, $serial);
- fclose($fd);
- if (!@ rename($temp_file, $cache_file)) {
- if (@ copy($temp_file, $cache_file)) {
- @ unlink($temp_file);
- }
- }
- }
- }
- // Release write lock.
- flock($mutex, LOCK_UN);
- fclose($mutex);
- }
- function stats() {
- echo "<p>";
- echo "<strong>Cold Cache Hits:</strong> {$this->cold_cache_hits}<br/>";
- echo "<strong>Warm Cache Hits:</strong> {$this->warm_cache_hits}<br/>";
- echo "<strong>Cache Misses:</strong> {$this->cache_misses}<br/>";
- echo "</p>";
- foreach ($this->cache as $group => $cache) {
- echo "<p>";
- echo "<strong>Group:</strong> $group<br/>";
- echo "<strong>Cache:</strong>";
- echo "<pre>";
- print_r($cache);
- echo "</pre>";
- if (isset ($this->dirty_objects[$group])) {
- echo "<strong>Dirty Objects:</strong>";
- echo "<pre>";
- print_r(array_unique($this->dirty_objects[$group]));
- echo "</pre>";
- echo "</p>";
- }
- }
- }
- function WP_Object_Cache() {
- global $blog_id;
- if (defined('DISABLE_CACHE'))
- return;
- if (defined('CACHE_PATH'))
- $this->cache_dir = CACHE_PATH;
- else
- $this->cache_dir = ABSPATH.'wp-content/cache/';
- if (is_writable($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;
- $this->blog_id = md5($blog_id);
- }
- }
- ?>