AlkantarClanX12
Your IP : 18.227.209.214
<?php
if (!defined('ABSPATH')) die('No direct access allowed');
if (!class_exists('Updraft_Task_Manager_1_2')) require_once(WPO_PLUGIN_MAIN_PATH . 'vendor/team-updraft/common-libs/src/updraft-tasks/class-updraft-task-manager.php');
if (!class_exists('WP_Optimize_Load_Url_Task')) require_once(dirname(__FILE__) . '/class-wpo-load-url-task.php');
class WP_Optimize_Page_Cache_Preloader extends Updraft_Task_Manager_1_2 {
private $task_type = 'load-url-task';
private $options;
static protected $_instance = null;
/**
* WP_Optimize_Page_Cache_Preloader constructor.
*/
public function __construct() {
parent::__construct();
$this->options = WP_Optimize()->get_options();
// setup loggers
$this->set_loggers(WP_Optimize()->wpo_loggers());
add_filter('cron_schedules', array($this, 'cron_add_intervals'));
add_action('wpo_page_cache_preload_continue', array($this, 'process_tasks_queue'));
add_action('wpo_page_cache_schedule_preload', array($this, 'run_scheduled_cache_preload'));
add_filter('updraft_interrupt_tasks_queue_'.$this->task_type, array($this, 'maybe_interrupt_queue'), 20);
}
/**
* Check if cache is active.
*
* @return bool
*/
public function is_cache_active() {
return WP_Optimize()->get_page_cache()->is_enabled();
}
/**
* Schedule or delete automatic preload action on cache settings update.
*
* @param array $new_settings The new settings
* @param array $previous_settings Settings before saving
*/
public function cache_settings_updated($new_settings, $previous_settings) {
if (!$new_settings['enable_page_caching']) {
wp_clear_scheduled_hook('wpo_page_cache_schedule_preload');
$this->delete_preload_continue_action();
return;
}
if (!empty($new_settings['enable_schedule_preload'])) {
$last_schedule_type = $previous_settings['preload_schedule_type'];
if (wp_next_scheduled('wpo_page_cache_schedule_preload')) {
// if already scheduled this schedule type
if ($new_settings['preload_schedule_type'] == $last_schedule_type) {
// If the schedule type is cache lifespan, check if the cache lifespan changed.
if ('wpo_use_cache_lifespan' == $new_settings['preload_schedule_type']) {
// Else, if the settings cache lifespan settings haven't changed, returns
if ($new_settings['page_cache_length_value'] == $previous_settings['page_cache_length_value'] && $new_settings['page_cache_length_unit'] == $previous_settings['page_cache_length_unit']) {
return;
}
} else {
return;
}
}
// clear currently scheduled preload action.
wp_clear_scheduled_hook('wpo_page_cache_schedule_preload');
}
// schedule preload action.
wp_schedule_event((time() + $this->get_schedule_interval($new_settings['preload_schedule_type'])), $new_settings['preload_schedule_type'], 'wpo_page_cache_schedule_preload');
} else {
wp_clear_scheduled_hook('wpo_page_cache_schedule_preload');
}
}
/**
* Clear active preload tasks, reschedule preload action.
*/
public function reschedule_preload() {
// clear scheduled action.
if (wp_next_scheduled('wpo_page_cache_schedule_preload')) {
wp_clear_scheduled_hook('wpo_page_cache_schedule_preload');
}
// schedule preload action if need.
if ($this->is_scheduled_preload_enabled()) {
$preload_schedule_type = $this->get_cache_config('preload_schedule_type');
wp_schedule_event(time() + $this->get_schedule_interval($preload_schedule_type), $preload_schedule_type, 'wpo_page_cache_schedule_preload');
}
}
/**
* Check if scheduled preload enabled.
*
* @return bool
*/
public function is_scheduled_preload_enabled() {
$enable_schedule_preload = $this->get_cache_config('enable_schedule_preload');
return !empty($enable_schedule_preload);
}
/**
* Get a schedule interval
*
* @param string $schedule_key The schedule to check
* @return integer
*/
private function get_schedule_interval($schedule_key) {
$schedules = wp_get_schedules();
if (!isset($schedules[$schedule_key])) {
$this->log('Could not get interval for event of type '.$schedule_key);
return 0;
}
return isset($schedules[$schedule_key]['interval']) ? $schedules[$schedule_key]['interval'] : 0;
}
/**
* Add intervals to cron schedules.
*
* @param array $schedules
*
* @return array
*/
public function cron_add_intervals($schedules) {
$interval = $this->get_continue_preload_cron_interval();
$schedules['wpo_page_cache_preload_continue_interval'] = array(
'interval' => $interval,
'display' => round($interval / 60, 1).' minutes'
);
$schedules['wpo_use_cache_lifespan'] = array(
'interval' => WPO_Cache_Config::instance()->get_option('page_cache_length'),
'display' => 'Same as cache lifespan: '.WPO_Cache_Config::instance()->get_option('page_cache_length_value').' '.WPO_Cache_Config::instance()->get_option('page_cache_length_unit')
);
return $schedules;
}
/**
* Get the interval to continuing a preload task
*
* @return integer
*/
private function get_continue_preload_cron_interval() {
/**
* Filters the interval between each preload attempt, in seconds.
*/
return (int) apply_filters('wpo_page_cache_preload_continue_interval', 600);
}
/**
* Schedule action for continuously preload.
*/
public function schedule_preload_continue_action() {
$continue_in = wp_next_scheduled('wpo_page_cache_preload_continue');
// Action is still scheduled
if ($continue_in && $continue_in > 0) return;
// Action is overdue, delete it and re schedule it
if ($continue_in && $continue_in < 0) $this->delete_preload_continue_action();
wp_schedule_event(time() + $this->get_schedule_interval('wpo_page_cache_preload_continue_interval'), 'wpo_page_cache_preload_continue_interval', 'wpo_page_cache_preload_continue');
}
/**
* Delete scheduled action for continuously preload.
*/
public function delete_preload_continue_action() {
wp_clear_scheduled_hook('wpo_page_cache_preload_continue');
}
/**
* Run cache preload. If task queue is empty it creates tasks for site urls.
*
* @param string $type - The preload type (schedule | manual)
* @param array $response - Specific response for echo into output thread when browser connection closing.
* @return array|void - Void when closing the browser connection
*/
public function run($type = 'scheduled', $response = null) {
if (!$this->is_cache_active()) {
return array(
'success' => false,
'error' => __('Page cache is disabled.', 'wp-optimize')
);
}
if (empty($response)) {
$response = array('success' => true);
}
$this->delete_cancel_flag();
// trying to lock semaphore.
$creating_tasks_semaphore = new Updraft_Semaphore_2_2('wpo_cache_preloader_creating_tasks');
$lock = $creating_tasks_semaphore->lock();
// if semaphore haven't locked then just return response.
if (!$lock) {
return array(
'success' => false,
'error' => __('Probably page cache preload is running already.', 'wp-optimize')
);
}
$is_wp_cli = defined('WP_CLI') && WP_CLI;
// close browser connection and continue work.
// don't close connection for WP-CLI
if (false == $is_wp_cli) {
WP_Optimize()->close_browser_connection(json_encode($response));
}
// trying to change time limit.
WP_Optimize()->change_time_limit();
$status = $this->get_status($this->task_type);
if (0 == $status['all_tasks'] && $lock) {
if (is_multisite()) {
$sites = WP_Optimize()->get_sites();
foreach ($sites as $site) {
switch_to_blog($site->blog_id);
$this->create_tasks_for_preload_site_urls($type);
restore_current_blog();
}
} else {
$this->create_tasks_for_preload_site_urls($type);
}
}
if ($lock) $creating_tasks_semaphore->unlock();
$this->process_tasks_queue();
// return $response in WP-CLI mode
if ($is_wp_cli) {
return $response;
}
}
/**
* Check if we need run cache preload and run it.
*/
public function run_scheduled_cache_preload() {
$schedule_type = WPO_Cache_Config::instance()->get_option('preload_schedule_type');
if (!$schedule_type) return;
// Don't run preload if cache lifespan option enabled and cache not expired yet.
if ('wpo_use_cache_lifespan' == $schedule_type) {
/**
* Filters the allowed time difference between the cache exiry and the current time, in seconds.
* If the cache expires in less than $allowed_time_difference, preload. Otherwise leave it.
*
* @param integer $allowed_time_difference The time difference, in seconds (default = 600)
*/
$allowed_time_difference = apply_filters('wpo_preload_allowed_time_difference', 600);
$page_cache_lifespan = WPO_Cache_Config::instance()->get_option('page_cache_length', 0);
$last_preload_time = $this->options->get_option('wpo_last_page_cache_preload', 0);
$time_since_last_preload = time() - $last_preload_time;
$minimum_time_to_next_schedule_preload = $page_cache_lifespan - $allowed_time_difference;
// Skip this if the last preload is not as old as the cache lifespan minus $allowed_time_difference
if ($page_cache_lifespan > 0 && $time_since_last_preload < $minimum_time_to_next_schedule_preload) return;
}
$this->run();
}
/**
* Process tasks queue.
*/
public function process_tasks_queue() {
// schedule continue preload action.
$this->schedule_preload_continue_action();
if (!$this->process_queue($this->task_type)) {
return;
}
// delete scheduled continue preload action.
$this->delete_preload_continue_action();
// update last cache preload time only if processing any tasks, else process was cancelled.
if ($this->is_running()) {
$this->options->update_option('wpo_last_page_cache_preload', time());
}
$this->clean_up_old_tasks($this->task_type);
}
/**
* Find out if the current queue should be interrupted
*
* @param boolean $interrupt
* @return boolean
*/
public function maybe_interrupt_queue($interrupt) {
if ($interrupt) return $interrupt;
static $memory_threshold = null;
if (null == $memory_threshold) {
/**
* Filters the minimum memory required before stopping a queue. Default: 10MB
*/
$memory_threshold = apply_filters('wpo_page_cache_preload_memory_threshold', 10485760);
}
return WP_Optimize()->get_free_memory() < $memory_threshold;
}
/**
* Delete all preload tasks from queue.
*/
public function cancel_preload() {
$this->set_cancel_flag();
$this->delete_tasks($this->task_type);
$this->delete_preload_continue_action();
}
/**
* Set 'cancel' option to true.
*/
public function set_cancel_flag() {
$this->options->update_option('last_page_cache_preload_cancel', true);
}
/**
* Delete 'cancel' option.
*/
public function delete_cancel_flag() {
$this->options->delete_option('last_page_cache_preload_cancel');
}
/**
* Check if the last preload is cancelled.
*
* @return bool
*/
public function is_cancelled() {
return $this->options->get_option('last_page_cache_preload_cancel', false);
}
/**
* Check if preloading queue is processing.
*
* @return bool
*/
public function is_busy() {
return $this->is_semaphore_locked($this->task_type) || $this->is_semaphore_locked('wpo_cache_preloader_creating_tasks');
}
/**
* Get current status of preloading urls.
*
* @return array
*/
public function get_status_info() {
$status = $this->get_status($this->task_type);
$cache_size = WP_Optimize()->get_page_cache()->get_cache_size();
if ($this->is_semaphore_locked('wpo_cache_preloader_creating_tasks') && !$this->is_cancelled()) {
// we are still creating tasks.
return array(
'done' => false,
'message' => __('Loading URLs...', 'wp-optimize'),
'size' => WP_Optimize()->format_size($cache_size['size']),
'file_count' => $cache_size['file_count']
);
} elseif ($status['complete_tasks'] == $status['all_tasks']) {
$gmt_offset = (int) (3600 * get_option('gmt_offset'));
$last_preload_time = $this->options->get_option('wpo_last_page_cache_preload');
if ($last_preload_time) {
$last_preload_time_str = date_i18n(get_option('time_format').', '.get_option('date_format'), $last_preload_time + $gmt_offset);
return array(
'done' => true,
'message' => sprintf(__('Last preload finished at %s', 'wp-optimize'), $last_preload_time_str),
'size' => WP_Optimize()->format_size($cache_size['size']),
'file_count' => $cache_size['file_count']
);
} else {
return array(
'done' => true,
'size' => WP_Optimize()->format_size($cache_size['size']),
'file_count' => $cache_size['file_count']
);
}
} else {
$preload_resuming_time = wp_next_scheduled('wpo_page_cache_preload_continue');
$preload_resuming_in = $preload_resuming_time ? $preload_resuming_time - time() : 0;
$preloaded_message = sprintf(_n('%1$s out of %2$s URL preloaded', '%1$s out of %2$s URLs preloaded', $status['all_tasks'], 'wp-optimize'), $status['complete_tasks'], $status['all_tasks']);
if ('sitemap' == $this->options->get_option('wpo_last_page_cache_preload_type', '')) {
$preloaded_message = __('Preloading posts found in sitemap:', 'wp-optimize') .' '. $preloaded_message;
}
$return = array(
'done' => false,
'message' => $preloaded_message,
'size' => WP_Optimize()->format_size($cache_size['size']),
'file_count' => $cache_size['file_count'],
'resume_in' => $preload_resuming_in
);
if (defined('DOING_AJAX') && DOING_AJAX) {
// if no cron was found or cron is overdue more than 20s, trigger it
if (!$preload_resuming_time || $preload_resuming_in < -20) {
$this->run($return);
}
}
return $return;
}
}
/**
* Check if preload action in process.
*
* @return bool
*/
public function is_running() {
$status = $this->get_status($this->task_type);
if ($status['all_tasks'] > 0) return true;
}
/**
* Get cache config option value.
*
* @return mixed
*/
public function get_cache_config($option) {
static $config = null;
if (null === $config) $config = WPO_Page_Cache::instance()->config->get();
if (is_array($config) && array_key_exists($option, $config)) {
return $config[$option];
}
return false;
}
/**
* Create tasks (WP_Optimize_Load_Url_Task) for preload all urls from site.
*
* @param string $type The preload type (currently: scheduled, manual)
* @return void
*/
public function create_tasks_for_preload_site_urls($type) {
$urls = $this->get_site_urls();
if (!empty($urls)) {
$this->log(__('Creating tasks for preload site urls.', 'wp-optimize'));
foreach ($urls as $url) {
if (wpo_url_in_exceptions($url)) continue;
if ($this->url_is_already_cached($url, $type)) {
continue;
}
// this description is being used for internal purposes.
$description = 'Preload - '.$url;
$options = array('url' => $url, 'preload_type' => $type, 'anonymous_user_allowed' => (defined('DOING_CRON') && DOING_CRON) || (defined('WP_CLI') && WP_CLI));
WP_Optimize_Load_Url_Task::create_task($this->task_type, $description, $options, 'WP_Optimize_Load_Url_Task');
}
$this->log(__('Tasks for preload site urls created.', 'wp-optimize'));
}
}
/**
* Preload desktop version from url.
*
* @param string $url
*
* @return void
*/
public function preload_desktop($url) {
$desktop_args = array(
'httpversion' => '1.1',
'user-agent' => 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.89 Safari/537.36',
'timeout' => 10,
);
$desktop_args = apply_filters('wpo_page_cache_preloader_desktop_args', $desktop_args, $url);
$this->log('preload_desktop - '. $url);
wp_remote_get($url, $desktop_args);
}
/**
* Preload mobile version from $url.
*
* @param string $url
*
* @return void
*/
public function preload_mobile($url) {
static $is_mobile_caching_enabled;
if (!isset($is_mobile_caching_enabled)) {
$is_mobile_caching_enabled = $this->get_cache_config('enable_mobile_caching');
}
// Only run if option is active
if (!$is_mobile_caching_enabled) return;
$mobile_args = array(
'httpversion' => '1.1',
'user-agent' => 'Mozilla/5.0 (iPhone; CPU iPhone OS 9_1 like Mac OS X) AppleWebKit/601.1.46 (KHTML, like Gecko) Version/9.0 Mobile/13B143 Safari/601.1',
'timeout' => 10,
);
$mobile_args = apply_filters('wpo_page_cache_preloader_mobile_args', $mobile_args, $url);
$this->log('preload_mobile - ' . $url);
wp_remote_get($url, $mobile_args);
}
/**
* Preload amp version from $url.
*
* @param string $url
*
* @return void
*/
public function preload_amp($url) {
if (!apply_filters('wpo_should_preload_amp', false, $url)) return;
$amp_args = array(
'httpversion' => '1.1',
'user-agent' => 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.89 Safari/537.36',
'timeout' => 10,
);
$url = untrailingslashit($url) . '/amp/';
$amp_args = apply_filters('wpo_page_cache_preloader_amp_args', $amp_args, $url);
$this->log('preload_amp - ' . $url);
wp_remote_get($url, $amp_args);
}
/**
* Check if sitemap exists then returns list of urls from sitemap file otherwise returns all posts urls.
*
* @return array
*/
public function get_site_urls() {
if ($this->exists_sitemap_file() && (false !== ($urls = $this->get_sitemap_urls()))) {
$this->options->update_option('wpo_last_page_cache_preload_type', 'sitemap');
} else {
$urls = $this->get_post_urls();
$this->options->update_option('wpo_last_page_cache_preload_type', 'posts');
}
$this->log(sprintf(_n('%d url found.', '%d urls found.', count($urls), 'wp-optimize'), count($urls)));
return $urls;
}
/**
* Check if sitemap file is exists.
*
* @return bool
*/
public function exists_sitemap_file() {
$response = wp_remote_get(site_url('/'.$this->get_sitemap_filename()), array('timeout' => 10));
if (is_wp_error($response) || '200' != wp_remote_retrieve_response_code($response)) {
$sitemap_file = $this->get_local_sitemap_file();
if (is_file($sitemap_file)) {
return true;
} else {
return false;
}
} else {
return true;
}
}
/**
* Loads sitemap file and returns list of urls.
*
* @param string $sitemap_url
*
* @return array|bool
*/
public function get_sitemap_urls($sitemap_url = '') {
$urls = array();
// if sitemap url is empty then use main sitemap file name.
$sitemap_url = ('' === $sitemap_url) ? site_url('/'.$this->get_sitemap_filename()) : $sitemap_url;
// if simplexml_load_string not available then we don't load sitemap.
if (!function_exists('simplexml_load_string')) {
return $urls;
}
// load sitemap file.
$response = wp_remote_get($sitemap_url, array('timeout' => 30));
// if we get error then
if (is_wp_error($response)) {
$response = file_get_contents($sitemap_url);
// if response is empty then try load from file.
if (empty($response) && '' == $sitemap_url) {
$sitemap_file = $this->get_local_sitemap_file();
$response = file_get_contents($sitemap_file);
}
if (empty($response)) return $urls;
$xml = @simplexml_load_string($response); // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged
} else {
// parse xml answer.
$xml = @simplexml_load_string(wp_remote_retrieve_body($response)); // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged
}
// xml file has not valid xml content then return false.
if (false === $xml) return false;
// if exists urls then return them.
if (isset($xml->url)) {
foreach ($xml->url as $element) {
if (!isset($element->loc)) continue;
$urls[] = (string) $element->loc;
}
} elseif (isset($xml->sitemap)) {
// if has links to other sitemap files then get urls from them.
foreach ($xml->sitemap as $element) {
if (!isset($element->loc)) continue;
$sitemap_urls = $this->get_sitemap_urls($element->loc);
if (is_array($sitemap_urls)) {
$urls = array_merge($urls, $sitemap_urls);
}
}
}
return $urls;
}
/**
* Get the path to a local sitemap file
*
* @return string
*/
private function get_local_sitemap_file() {
if (!function_exists('get_home_path')) {
include_once ABSPATH . '/wp-admin/includes/file.php';
}
return trailingslashit(get_home_path()) . $this->get_sitemap_filename();
}
/**
* Get all posts of any post type and returns urls for them.
*
* @return array
*/
public function get_post_urls() {
$offset = 0;
$posts_per_page = 1000;
$urls = array();
$urls[] = site_url('/');
do {
$query = new WP_Query(array(
'post_type' => 'any',
'post_status' => 'publish',
'posts_per_page' => $posts_per_page,
'offset' => $offset,
'orderby' => 'ID',
'order' => 'ASC',
'cache_results' => false, // disable cache to avoid memory error.
));
$posts_loaded = $query->post_count;
while ($query->have_posts()) {
$query->the_post();
$urls[] = get_permalink();
}
$offset += $posts_loaded;
} while ($posts_loaded > 0);
/**
* If domain mapping enabled then replace domains in urls.
*/
if ($this->is_domain_mapping_enabled()) {
$blog_id = get_current_blog_id();
$mapped_domain = $this->get_mapped_domain($blog_id);
$blog_details = get_blog_details($blog_id);
if ($mapped_domain) {
foreach ($urls as $i => $url) {
$urls[$i] = preg_replace('/'.$blog_details->domain.'/i', $mapped_domain, $url, 1);
}
}
}
wp_reset_postdata();
return $urls;
}
/**
* Check if domain mapping enabled.
*
* @return bool
*/
public function is_domain_mapping_enabled() {
// SUNRISE constant is defined with installation WordPress MU Domain Mapping plugin.
$enabled = is_multisite() && defined('SUNRISE') && 'on' == strtolower(SUNRISE);
/**
* Filters if Multisite Domain mapping is enabled.
* Currently, we can only detect if the WordPress MU Domain Mapping plugin is in use.
* Using the WP Core functionality should not require this, unless if the domain name is set somewhere else but in the site url option.
*/
return apply_filters('wpo_is_domain_mapping_enabled', $enabled);
}
/**
* Return mapped domain by $blog_id.
*
* @param int $blog_id
*
* @return string
*/
public function get_mapped_domain($blog_id) {
global $wpdb;
$domain = '';
$multisite_plugin_table_name = $wpdb->base_prefix.'domain_mapping';
// Check if table exists
if ($wpdb->get_var("SHOW TABLES LIKE '$multisite_plugin_table_name'") != $multisite_plugin_table_name) {
// This table created in WordPress MU Domain Mapping plugin.
$row = $wpdb->get_row("SELECT `domain` FROM {$multisite_plugin_table_name} WHERE `blog_id` = {$blog_id} AND `active` = 1", ARRAY_A);
if (!empty($row)) {
$domain = $row['domain'];
}
} else {
// When using the WP Core method, the site url option contains the mapped domain.
$domain = get_site_url($blog_id);
}
/**
* Filters the mapped domain name
*
* @param string $domain The domain name
* @param integer $blog_id The blog ID
*/
return apply_filters('wpo_get_mapped_domain', $domain, $blog_id);
}
/**
* Captures and logs any interesting messages
*
* @param String $message - the error message
* @param String $error_type - the error type
*/
public function log($message, $error_type = 'info') {
if (isset($this->loggers)) {
foreach ($this->loggers as $logger) {
$logger->log($error_type, $message);
}
}
}
/**
* Instance of WP_Optimize_Page_Cache_Preloader.
*
* @return WP_Optimize_Page_Cache_Preloader
*/
public static function instance() {
if (empty(self::$_instance)) {
self::$_instance = new WP_Optimize_Page_Cache_Preloader();
}
return self::$_instance;
}
/**
* Get sitemap filename.
*
* @return string
*/
private function get_sitemap_filename() {
/**
* Filter the sitemap file used to collect the URLs to preload
*
* @param string $filename - The sitemap name
* @default sitemap.xml
*/
return apply_filters('wpo_cache_preload_sitemap_filename', 'sitemap.xml');
}
/**
* Check if semaphore is locked.
*
* @param string $semaphore
* @return bool
*/
private function is_semaphore_locked($semaphore) {
$semaphore = new Updraft_Semaphore_2_2($semaphore);
return $semaphore->is_locked();
}
/**
* Check if the URL is already cached, or needs to be preloaded
*
* @param string $url The preloaded url
* @param string $preload_type The preload type (manual | scheduled)
* @return boolean
*/
private function url_is_already_cached($url, $preload_type) {
static $files = array();
$regenerate_count = 0;
$folder = trailingslashit(WPO_CACHE_FILES_DIR) . wpo_get_url_path($url);
// If the folder does not exist, consider the URL as cleared
if (!is_dir($folder)) return false;
if (empty($files)) {
// Check only the base files
$files[] = 'index.html';
if (WPO_Cache_Config::instance()->get_option('enable_mobile_caching')) {
$files[] = 'mobile.index.html';
}
$files = apply_filters('wpo_maybe_clear_files_list', $files);
}
foreach ($files as $file) {
$file_path = trailingslashit($folder).$file;
if (!file_exists($file_path)) {
// The file does not exist, count it as "deleted"
$regenerate_count++;
continue;
}
if ($this->should_regenerate_file($file_path, $preload_type)) {
// delefe the expired cache file
unlink($file_path);
$regenerate_count++;
}
}
// if 0 == $regenerate_count, nothing all the expected files exist, and none were deleted.
return 0 == $regenerate_count;
}
/**
* Determine if a file should be regenerated
*
* @param string $path The file to check
* @param string $preload_type The preload type (manual | scheduled)
*
* @return boolean
*/
private function should_regenerate_file($path, $preload_type) {
// Store the variables, as they'll be used for each file and each file
static $is_preloader_scheduled = null;
static $lifespan = null;
static $schedule_type = null;
static $schedule_interval = null;
static $lifespan_expiry_threshold = null;
static $always_regenerate_file_if_preload_is_manual = null;
static $always_regenerate_file_if_preload_is_scheduled = null;
static $regenerate_file_when_no_expiry_date = null;
// Sets the variables once per request:
if (null === $is_preloader_scheduled) {
$is_preloader_scheduled = WPO_Cache_Config::instance()->get_option('enable_schedule_preload');
$schedule_type = WPO_Cache_Config::instance()->get_option('preload_schedule_type');
$lifespan = WPO_Cache_Config::instance()->get_option('page_cache_length');
$schedule_interval = $this->get_schedule_interval($schedule_type);
/**
* Expiry threshold: the current file will be considered stale if within the threshold. Default: 600s (10min)
*/
$lifespan_expiry_threshold = apply_filters('wpo_lifespan_expiry_threshold', 600);
/**
* Filters if a cache should systematically be regenerated when running a manual preload. Default: false
*/
$always_regenerate_file_if_preload_is_manual = apply_filters('wpo_always_regenerate_file_if_preload_is_manual', false);
/**
* Filters if a cache should systematically be regenerated when running a scheduled preload. Default: false
*/
$always_regenerate_file_if_preload_is_scheduled = apply_filters('wpo_always_regenerate_file_if_preload_is_scheduled', false);
/**
* Filters if a cache should systematically be regenerated when running a preload and no schedule is set, and cache does not expire. Default: true
*/
$regenerate_file_when_no_expiry_date = apply_filters('wpo_regenerate_file_when_no_expiry_date', true);
}
if (($always_regenerate_file_if_preload_is_manual && 'manual' == $preload_type) || ($always_regenerate_file_if_preload_is_scheduled && 'scheduled' == $preload_type)) {
$result = true;
} else {
$modified_time = (int) filemtime($path);
// cache lifespan is set.
if (0 != $lifespan) {
$expiry_time = $modified_time + $lifespan - $lifespan_expiry_threshold;
$result = time() > $expiry_time;
} elseif ($is_preloader_scheduled) {
$expiry_time = $modified_time + $schedule_interval - $lifespan_expiry_threshold;
$result = time() > $expiry_time;
} else {
$result = $regenerate_file_when_no_expiry_date;
}
}
return apply_filters('wpo_preloader_should_regenerate_file', $result, $path, $preload_type);
}
}
WP_Optimize_Page_Cache_Preloader::instance();