435 lines
10 KiB
PHP
435 lines
10 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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return $wp_object_cache->flush();
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}
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function wp_cache_get($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 = 900;
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var $flock_filename = 'wp_object_cache.lock';
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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', 'userlogins', '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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var $secret = '';
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function acquire_lock() {
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// Acquire a write lock.
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$this->mutex = @fopen($this->cache_dir.$this->flock_filename, 'w');
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if ( false == $this->mutex)
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return false;
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flock($this->mutex, LOCK_EX);
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return true;
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}
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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', $force = false) {
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if (empty ($group))
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$group = 'default';
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if (!$force && 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][] = $id;
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return true;
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}
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function flush() {
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if ( !$this->cache_enabled )
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return true;
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if ( ! $this->acquire_lock() )
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return false;
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$this->rm_cache_dir();
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$this->cache = array ();
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$this->dirty_objects = array ();
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$this->non_existant_objects = array ();
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$this->release_lock();
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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($group)."/".$this->hash($id).'.php';
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if (!file_exists($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, $group, true);
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return false;
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}
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$this->cache[$group][$id] = unserialize(base64_decode(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}/$group";
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}
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function hash($data) {
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if ( function_exists('hash_hmac') ) {
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return hash_hmac('md5', $data, $this->secret);
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} else {
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return md5($data . $this->secret);
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}
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}
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function load_group_from_db($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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}
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} else
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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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if ( ! $options )
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return;
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foreach ($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.$make_dir."index.php")) {
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$file_perms = $perms & 0000666;
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@ touch($this->cache_dir.$make_dir."index.php");
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@ chmod($this->cache_dir.$make_dir."index.php", $file_perms);
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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 rm_cache_dir() {
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$dir = $this->cache_dir;
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$dir = rtrim($dir, DIRECTORY_SEPARATOR);
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$top_dir = $dir;
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$stack = array($dir);
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$index = 0;
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while ($index < count($stack)) {
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# Get indexed directory from stack
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$dir = $stack[$index];
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$dh = @ opendir($dir);
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if (!$dh)
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return false;
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while (($file = @ readdir($dh)) !== false) {
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if ($file == '.' or $file == '..')
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continue;
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if (@ is_dir($dir . DIRECTORY_SEPARATOR . $file))
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$stack[] = $dir . DIRECTORY_SEPARATOR . $file;
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else if (@ is_file($dir . DIRECTORY_SEPARATOR . $file))
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@ unlink($dir . DIRECTORY_SEPARATOR . $file);
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}
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$index++;
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}
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$stack = array_reverse($stack); // Last added dirs are deepest
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foreach($stack as $dir) {
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if ( $dir != $top_dir)
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@ rmdir($dir);
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}
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}
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function release_lock() {
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// Release write lock.
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flock($this->mutex, LOCK_UN);
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fclose($this->mutex);
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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 (!$this->cache_enabled)
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return true;
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if (empty ($this->dirty_objects))
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return true;
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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 = $stat['mode'] & 0007777; // Get the permission bits.
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$file_perms = $dir_perms & 0000666; // Remove execute bits for files.
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// Make the base cache dir.
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if (!file_exists($this->cache_dir)) {
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if (! @ mkdir($this->cache_dir))
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return false;
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@ chmod($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($this->cache_dir."index.php");
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@ chmod($this->cache_dir."index.php", $file_perms);
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}
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if ( ! $this->acquire_lock() )
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return false;
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// Loop over dirty objects and save them.
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$errors = 0;
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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 = $group_dir.$this->hash($id).'.php';
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// Remove the cache file if the key is not set.
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if (!isset ($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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$serial = CACHE_SERIAL_HEADER.base64_encode(serialize($this->cache[$group][$id])).CACHE_SERIAL_FOOTER;
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$fd = @fopen($temp_file, 'w');
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if ( false === $fd ) {
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$errors++;
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continue;
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}
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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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else
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$errors++;
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}
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@ chmod($cache_file, $file_perms);
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}
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}
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$this->dirty_objects = array();
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$this->release_lock();
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if ( $errors )
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return false;
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return true;
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}
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function stats() {
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echo "<p>";
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echo "<strong>Cold Cache Hits:</strong> {$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 $blog_id;
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if (defined('DISABLE_CACHE'))
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return;
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if ( ! defined('ENABLE_CACHE') )
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return;
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// Disable the persistent cache if safe_mode is on.
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if ( ini_get('safe_mode') && ! defined('ENABLE_CACHE') )
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return;
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if (defined('CACHE_PATH'))
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$this->cache_dir = CACHE_PATH;
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else
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// Using the correct separator eliminates some cache flush errors on Windows
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$this->cache_dir = ABSPATH.'wp-content'.DIRECTORY_SEPARATOR.'cache'.DIRECTORY_SEPARATOR;
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if (is_writable($this->cache_dir) && is_dir($this->cache_dir)) {
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$this->cache_enabled = true;
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} else {
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if (is_writable(ABSPATH.'wp-content')) {
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$this->cache_enabled = true;
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}
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}
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if (defined('CACHE_EXPIRATION_TIME'))
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$this->expiration_time = CACHE_EXPIRATION_TIME;
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if ( defined('WP_SECRET') )
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$this->secret = WP_SECRET;
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else
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$this->secret = DB_PASSWORD . DB_USER . DB_NAME . DB_HOST . ABSPATH;
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$this->blog_id = $this->hash($blog_id);
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}
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}
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?>
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