<?php
/**
 * A pseudo-cron daemon for scheduling WordPress tasks.
 *
 * WP-Cron is triggered when the site receives a visit. In the scenario
 * where a site may not receive enough visits to execute scheduled tasks
 * in a timely manner, this file can be called directly or via a server
 * cron daemon for X number of times.
 *
 * Defining DISABLE_WP_CRON as true and calling this file directly are
 * mutually exclusive and the latter does not rely on the former to work.
 *
 * The HTTP request to this file will not slow down the visitor who happens to
 * visit when a scheduled cron event runs.
 *
 * @package WordPress
 */

ignore_user_abort( true );

if ( ! headers_sent() ) {
	header( 'Expires: Wed, 11 Jan 1984 05:00:00 GMT' );
	header( 'Cache-Control: no-cache, must-revalidate, max-age=0' );
}

if ( function_exists( 'fastcgi_finish_request' ) ) {
	fastcgi_finish_request();
} elseif ( function_exists( 'litespeed_finish_request' ) ) {
	litespeed_finish_request();
}

if ( ! empty( $_POST ) || defined( 'DOING_AJAX' ) || defined( 'DOING_CRON' ) ) {
	die();
}

define( 'DOING_CRON', true );

if ( ! defined( 'ABSPATH' ) ) {
	require_once __DIR__ . '/wp-load.php';
}

wp_raise_memory_limit( 'cron' );

function _get_cron_lock() {
	global $wpdb;

	$value = 0;
	if ( wp_using_ext_object_cache() ) {
		$value = wp_cache_get( 'doing_cron', 'transient', true );
	} else {
		$row = $wpdb->get_row( $wpdb->prepare( "SELECT option_value FROM $wpdb->options WHERE option_name = %s LIMIT 1", '_transient_doing_cron' ) );
		if ( is_object( $row ) ) {
			$value = $row->option_value;
		}
	}

	return $value;
}

$crons = wp_get_ready_cron_jobs();
if ( empty( $crons ) ) {
	die();
}

$gmt_time = microtime( true );
$doing_cron_transient = get_transient( 'doing_cron' );

if ( empty( $doing_wp_cron ) ) {
	if ( empty( $_GET['doing_wp_cron'] ) ) {
		if ( $doing_cron_transient && ( $doing_cron_transient + WP_CRON_LOCK_TIMEOUT > $gmt_time ) ) {
			return;
		}
		$doing_wp_cron        = sprintf( '%.22F', microtime( true ) );
		$doing_cron_transient = $doing_wp_cron;
		set_transient( 'doing_cron', $doing_wp_cron );
	} else {
		$doing_wp_cron = $_GET['doing_wp_cron'];
	}
}

if ( $doing_cron_transient !== $doing_wp_cron ) {
	return;
}

foreach ( $crons as $timestamp => $cronhooks ) {
	if ( $timestamp > $gmt_time ) {
		break;
	}

	foreach ( $cronhooks as $hook => $keys ) {

		foreach ( $keys as $k => $v ) {

			$schedule = $v['schedule'];

			if ( $schedule ) {
				$result = wp_reschedule_event( $timestamp, $schedule, $hook, $v['args'], true );

				if ( is_wp_error( $result ) ) {
					error_log(
						sprintf(
							__( 'Cron reschedule event error for hook: %1$s, Error code: %2$s, Error message: %3$s, Data: %4$s' ),
							$hook,
							$result->get_error_code(),
							$result->get_error_message(),
							wp_json_encode( $v )
						)
					);

					do_action( 'cron_reschedule_event_error', $result, $hook, $v );
				}
			}

			$result = wp_unschedule_event( $timestamp, $hook, $v['args'], true );

			if ( is_wp_error( $result ) ) {
				error_log(
					sprintf(
						__( 'Cron unschedule event error for hook: %1$s, Error code: %2$s, Error message: %3$s, Data: %4$s' ),
						$hook,
						$result->get_error_code(),
						$result->get_error_message(),
						wp_json_encode( $v )
					)
				);

				do_action( 'cron_unschedule_event_error', $result, $hook, $v );
			}

			do_action_ref_array( $hook, $v['args'] );

			if ( _get_cron_lock() !== $doing_wp_cron ) {
				return;
			}
		}
	}
}

if ( _get_cron_lock() === $doing_wp_cron ) {
	delete_transient( 'doing_cron' );
}

die();
?>