<?php
/**
* Plugin name: Spider-Cache
* Plugin URI: https://wordpress.org/plugins/wp-spider-cache/
* Description: Fully rendered pages stored in & served from Memcached.
* Version: 2.1.0
*/
// Exit if accessed directly
defined('ABSPATH') || exit;
// Required files
require_once WP_CONTENT_DIR . '/plugins/wp-spider-cache/includes/functions.php';
// Initialize the caches
if (!wp_skip_output_cache()) {
wp_object_cache_init();
wp_output_cache_init();
}
/**
* Clear a cached URL
*
* @since 2.3.0
*
* @param string $url
*
* @return boolean
*/
public static function clean_url($url = '')
{
// Bail if no URL
if (empty($url)) {
return false;
}
// Bail if no persistent output cache
if (!function_exists('wp_output_cache')) {
return false;
}
// Normalize the URL
if (0 === strpos($url, 'https://')) {
$url = str_replace('https://', 'http://', $url);
}
if (0 !== strpos($url, 'http://')) {
$url = 'http://' . $url;
}
$url_key = md5($url);
// Get cache objects
$output_cache = wp_output_cache_init();
$object_cache = wp_object_cache_init();
// Bail if either cache is missing
if (empty($output_cache) || empty($object_cache)) {
return;
}
wp_cache_add("{$url_key}_version", 0, $output_cache->group);
$retval = wp_cache_incr("{$url_key}_version", 1, $output_cache->group);
$output_cache_no_remote_group_key = array_search($output_cache->group, (array) $object_cache->no_remote_groups);
// The *_version key needs to be replicated remotely, otherwise invalidation won't work.
// The race condition here should be acceptable.
if (false !== $output_cache_no_remote_group_key) {
unset($object_cache->no_remote_groups[$output_cache_no_remote_group_key]);
$retval = wp_cache_set("{$url_key}_version", $retval, $output_cache->group);
$object_cache->no_remote_groups[$output_cache_no_remote_group_key] = $output_cache->group;
}
return $retval;
}
/**
* Returns the Output Cache Global.
*
* @since 2.1.0
*
* @global WP_Spider_Cache_Output $wp_output_cache WordPress Output Cache
* @return object
*/
function wp_output_cache()
{
if (!isset($GLOBALS['wp_output_cache'])) {
wp_output_cache_init();
}
return $GLOBALS['wp_output_cache'];
}