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<?php
/**
* Preload caache files.
*
* @since 2.1.0
* @package Hummingbird\Core\Modules\Caching
*/
namespace Hummingbird\Core\Modules\Caching;
use Hummingbird\Core\Filesystem;
use Hummingbird\Core\Settings;
if ( ! defined( 'ABSPATH' ) ) {
exit;
}
/**
* Class Preload
*/
class Preload extends Background_Process {
/**
* Database row prefix.
*
* @since 2.1.0
* @var string $prefix
*/
protected $prefix = 'wphb';
/**
* Unique process ID.
*
* @since 2.1.0
* @var string $action
*/
protected $action = 'cache_preload';
/**
* Task that does the preloading of each item (url).
*
* @param mixed $item Queue item to iterate over.
*
* @return bool
*/
protected function task( $item ) {
$args = array(
'timeout' => 0.01,
'blocking' => false,
'user-agent' => 'Hummingbird ' . WPHB_VERSION . '/Cache Preloader',
'sslverify' => false,
);
wp_remote_get( esc_url_raw( $item ), $args );
usleep( 500000 );
return false;
}
/**
* Populate the queue for preloading with the provided URL, or preload all pages.
*
* @since 2.1.0
*
* @param string $url URL of the page to preload. Leave blank to preload all.
*/
private function preload( $url ) {
// Try to avoid recursive loops.
if ( isset( $_SERVER['HTTP_USER_AGENT'] ) ) {
$user_agent = sanitize_text_field( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) );
if ( preg_match( '/Hummingbird.+?\/Cache Preloader/', $user_agent ) ) {
return;
}
}
$this->push_to_queue( $url );
$this->save()->dispatch();
}
/**
* Check if the desired path is already cached in the filesystem.
*
* @since 2.7.3
*
* @param string $path Path to cacche.
*
* @return bool
*/
private function is_cached( $path ) {
global $wphb_fs;
// Init filesystem.
if ( ! $wphb_fs ) {
$wphb_fs = Filesystem::instance();
}
$http_host = '';
if ( isset( $_SERVER['HTTP_HOST'] ) ) {
$http_host = htmlentities( wp_unslash( $_SERVER['HTTP_HOST'] ) ); // Input var ok.
} elseif ( function_exists( 'get_option' ) ) {
$http_host = preg_replace( '/https?:\/\//', '', get_option( 'siteurl' ) );
}
return is_dir( $wphb_fs->cache_dir . $http_host . $path );
}
/**
* Callback function after clearing cache for a page/post.
*
* @since 2.1.0
*
* @param string $path Path to page.
*/
public function preload_page_on_purge( $path ) {
// Do not parse empty paths.
if ( ! $path ) {
return;
}
// Do not preload if not enabled.
$enabled = Settings::get_setting( 'preload', 'page_cache' );
if ( ! $enabled ) {
return;
}
if ( $this->is_cached( $path ) ) {
return;
}
$types = Settings::get_setting( 'preload_type', 'page_cache' );
if ( isset( $types['on_clear'] ) && $types['on_clear'] && ! $this->is_process_running() ) {
$url = get_option( 'home' ) . $path;
$this->preload( $url );
}
}
/**
* Preload home page.
*
* @since 2.3.0
*/
public function preload_home_page() {
if ( $this->is_process_running() ) {
return;
}
$this->preload( get_option( 'home' ) );
}
}