344 lines
8.8 KiB
PHP
344 lines
8.8 KiB
PHP
<?php
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function wp_cache_add($key, $data, $flag = '', $expire = 0) {
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global $wp_object_cache;
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return $wp_object_cache->add($key, $data, $flag, $expire);
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}
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function wp_cache_close() {
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global $wp_object_cache;
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return $wp_object_cache->save();
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}
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function wp_cache_delete($id, $flag = '') {
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global $wp_object_cache;
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return $wp_object_cache->delete($id, $flag);
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}
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function wp_cache_flush() {
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global $wp_object_cache;
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}
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function wp_cache_get($id, $flag = '') {
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global $wp_object_cache;
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return $wp_object_cache->get($id, $flag);
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}
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function wp_cache_init() {
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global $wp_object_cache;
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$wp_object_cache = new WP_Object_Cache();
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}
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function wp_cache_replace($key, $data, $flag = '', $expire = 0) {
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global $wp_object_cache;
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return $wp_object_cache->replace($key, $data, $flag, $expire);
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}
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function wp_cache_set($key, $data, $flag = '', $expire = 0) {
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global $wp_object_cache;
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return $wp_object_cache->set($key, $data, $flag, $expire);
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}
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define('CACHE_SERIAL_HEADER', "<?php\n//");
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define('CACHE_SERIAL_FOOTER', "\n?".">");
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class WP_Object_Cache {
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var $cache_dir;
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var $cache_enabled = false;
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var $expiration_time = 86400;
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var $use_flock = false;
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var $flock_filename = 'wp_object_cache.lock';
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var $sem_id = 5454;
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var $mutex;
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var $cache = array ();
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var $dirty_objects = array ();
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var $non_existant_objects = array();
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var $global_groups = array('users', 'usermeta');
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var $blog_id;
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var $cold_cache_hits = 0;
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var $warm_cache_hits = 0;
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var $cache_misses = 0;
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function add($id, $data, $group = 'default', $expire = '') {
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if ( empty($group) )
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$group = 'default';
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if ( false !== $this->get($id, $group, false) )
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return false;
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return $this->set($id, $data, $group, $expire);
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}
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function delete($id, $group = 'default') {
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if ( empty($group) )
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$group = 'default';
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if ( false === $this->get($id, $group, false) )
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return false;
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unset ($this->cache[$group][$id]);
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$this->non_existant_objects[$group][$id] = true;
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$this->dirty_objects[$group][] = $id;
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return true;
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}
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function get($id, $group = 'default', $count_hits = true) {
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if ( empty($group) )
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$group = 'default';
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if (isset ($this->cache[$group][$id])) {
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if ( $count_hits )
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$this->warm_cache_hits += 1;
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return $this->cache[$group][$id];
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}
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if ( isset($this->non_existant_objects[$group][$id]) )
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return false;
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// If caching is not enabled, we have to fall back to pulling from the DB.
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if (!$this->cache_enabled) {
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if (!isset ($this->cache[$group]))
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$this->load_group_from_db($group);
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if (isset ($this->cache[$group][$id])) {
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$this->cold_cache_hits += 1;
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return $this->cache[$group][$id];
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}
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$this->non_existant_objects[$group][$id] = true;
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$this->cache_misses += 1;
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return false;
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}
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$cache_file = $this->cache_dir . $this->get_group_dir($group) . "/" . md5($id . DB_PASSWORD) . '.php';
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if (!file_exists($cache_file)) {
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$this->non_existant_objects[$group][$id] = true;
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$this->cache_misses += 1;
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return false;
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}
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// If the object has expired, remove it from the cache and return false to force
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// a refresh.
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$now = time();
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if ( (filemtime($cache_file) + $this->expiration_time) <= $now ) {
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$this->cache_misses += 1;
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$this->delete($id, $group);
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return false;
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}
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$this->cache[$group][$id] = unserialize(substr(@ file_get_contents($cache_file), strlen(CACHE_SERIAL_HEADER), -strlen(CACHE_SERIAL_FOOTER)));
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if ( false === $this->cache[$group][$id])
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$this->cache[$group][$id] = '';
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$this->cold_cache_hits += 1;
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return $this->cache[$group][$id];
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}
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function get_group_dir($group) {
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if ( false !== array_search($group, $this->global_groups) )
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return $group;
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return "{$this->blog_id}/$group";
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}
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function load_group_from_db($group) {
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global $wpdb;
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if ('category' == $group) {
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$this->cache['category'] = array ();
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if ($dogs = $wpdb->get_results("SELECT * FROM $wpdb->categories")) {
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foreach ($dogs as $catt)
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$this->cache['category'][$catt->cat_ID] = $catt;
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foreach ($this->cache['category'] as $catt) {
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$curcat = $catt->cat_ID;
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$fullpath = '/'.$this->cache['category'][$catt->cat_ID]->category_nicename;
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while ($this->cache['category'][$curcat]->category_parent != 0) {
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$curcat = $this->cache['category'][$curcat]->category_parent;
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$fullpath = '/'.$this->cache['category'][$curcat]->category_nicename.$fullpath;
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}
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$this->cache['category'][$catt->cat_ID]->fullpath = $fullpath;
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}
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}
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} else if ( 'options' == $group ) {
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$wpdb->hide_errors();
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if ( !$options = $wpdb->get_results("SELECT option_name, option_value FROM $wpdb->options WHERE autoload = 'yes'") ) {
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$options = $wpdb->get_results("SELECT option_name, option_value FROM $wpdb->options");
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}
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$wpdb->show_errors();
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foreach ($options as $option) {
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$this->cache['options'][$option->option_name] = $option->option_value;
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}
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}
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}
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function make_group_dir($group, $perms) {
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$group_dir = $this->get_group_dir($group);
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$make_dir = '';
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foreach ( split('/', $group_dir) as $subdir) {
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$make_dir .= "$subdir/";
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if (!file_exists($this->cache_dir . $make_dir)) {
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if (!mkdir($this->cache_dir . $make_dir))
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break;
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@ chmod($this->cache_dir . $make_dir, $perms);
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}
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if (!file_exists($this->cache_dir . $make_dir . "index.php")) {
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touch($this->cache_dir . $make_dir . "index.php");
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}
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}
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return $this->cache_dir . "$group_dir/";
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}
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function replace($id, $data, $group = 'default', $expire = '') {
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if ( empty($group) )
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$group = 'default';
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if ( false === $this->get($id, $group, false) )
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return false;
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return $this->set($id, $data, $group, $expire);
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}
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function set($id, $data, $group = 'default', $expire = '') {
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if ( empty($group) )
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$group = 'default';
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if ( NULL == $data)
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$data = '';
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$this->cache[$group][$id] = $data;
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unset($this->non_existant_objects[$group][$id]);
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$this->dirty_objects[$group][] = $id;
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return true;
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}
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function save() {
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//$this->stats();
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if (!$this->cache_enabled)
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return;
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if (empty ($this->dirty_objects))
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return;
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// Give the new dirs the same perms as wp-content.
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$stat = stat(ABSPATH.'wp-content');
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$dir_perms = $stat['mode'] & 0000777; // Get the permission bits.
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// Make the base cache dir.
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if (!file_exists($this->cache_dir)) {
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if (!mkdir($this->cache_dir))
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return;
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@ chmod($this->cache_dir, $dir_perms);
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}
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if (!file_exists($this->cache_dir . "index.php")) {
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touch($this->cache_dir . "index.php");
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}
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// Acquire a write lock. Semaphore preferred. Fallback to flock.
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if (function_exists('sem_get')) {
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$this->use_flock = false;
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$mutex = sem_get($this->sem_id, 1, 0644 | IPC_CREAT, 1);
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sem_acquire($mutex);
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} else {
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$this->use_flock = true;
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$mutex = fopen($this->cache_dir.$this->flock_filename, 'w');
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flock($mutex, LOCK_EX);
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}
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// Loop over dirty objects and save them.
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foreach ($this->dirty_objects as $group => $ids) {
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$group_dir = $this->make_group_dir($group, $dir_perms);
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$ids = array_unique($ids);
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foreach ($ids as $id) {
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$cache_file = $group_dir . md5($id . DB_PASSWORD) . '.php';
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// Remove the cache file if the key is not set.
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if ( ! isset($this->cache[$group][$id]) ) {
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if ( file_exists($cache_file) )
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unlink($cache_file);
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continue;
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}
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$temp_file = tempnam($group_dir, 'tmp');
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$serial = CACHE_SERIAL_HEADER . serialize($this->cache[$group][$id]) . CACHE_SERIAL_FOOTER;
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$fd = fopen($temp_file, 'w');
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fputs($fd, $serial);
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fclose($fd);
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if (!@rename($temp_file, $cache_file)) {
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if (copy ($temp_file, $cache_file)) {
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unlink($temp_file);
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}
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}
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}
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}
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// Release write lock.
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if ($this->use_flock)
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flock($mutex, LOCK_UN);
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else
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sem_release($mutex);
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}
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function stats() {
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echo "<p>";
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echo "<strong>Cold Cache Hits:</strong> {$this->cold_cache_hits}<br/>";
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echo "<strong>Warm Cache Hits:</strong> {$this->warm_cache_hits}<br/>";
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echo "<strong>Cache Misses:</strong> {$this->cache_misses}<br/>";
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echo "</p>";
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foreach ($this->cache as $group => $cache) {
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echo "<p>";
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echo "<strong>Group:</strong> $group<br/>";
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echo "<strong>Cache:</strong>";
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echo "<pre>";
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print_r($cache);
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echo "</pre>";
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if ( isset($this->dirty_objects[$group]) ) {
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echo "<strong>Dirty Objects:</strong>";
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echo "<pre>";
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print_r(array_unique($this->dirty_objects[$group]));
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echo "</pre>";
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echo "</p>";
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}
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}
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}
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function WP_Object_Cache() {
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global $blog_id;
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if ( defined('DISABLE_CACHE') )
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return;
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if ( defined('CACHE_PATH') )
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$this->cache_dir = CACHE_PATH;
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else
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$this->cache_dir = ABSPATH.'wp-content/cache/';
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if ( is_dir($this->cache_dir) ) {
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if ( is_writable($this->cache_dir) )
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$this->cache_enabled = true;
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} else if (is_writable(ABSPATH.'wp-content')) {
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$this->cache_enabled = true;
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}
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if ( defined('CACHE_EXPIRATION_TIME') )
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$this->expiration_time = CACHE_EXPIRATION_TIME;
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$this->blog_id = md5($blog_id);
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}
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}
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?>
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