e879f7d457
Props chinteshprajapati, subrataemfluence, nielslange. Fixes #46104. git-svn-id: https://develop.svn.wordpress.org/trunk@46733 602fd350-edb4-49c9-b593-d223f7449a82
153 lines
3.9 KiB
PHP
153 lines
3.9 KiB
PHP
<?php
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/**
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* A pseudo-CRON daemon for scheduling WordPress tasks
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*
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* WP Cron is triggered when the site receives a visit. In the scenario
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* where a site may not receive enough visits to execute scheduled tasks
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* in a timely manner, this file can be called directly or via a server
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* CRON daemon for X number of times.
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*
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* Defining DISABLE_WP_CRON as true and calling this file directly are
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* mutually exclusive and the latter does not rely on the former to work.
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*
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* The HTTP request to this file will not slow down the visitor who happens to
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* visit when the cron job is needed to run.
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*
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* @package WordPress
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*/
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ignore_user_abort( true );
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/* Don't make the request block till we finish, if possible. */
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if ( function_exists( 'fastcgi_finish_request' ) && version_compare( phpversion(), '7.0.16', '>=' ) ) {
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if ( ! headers_sent() ) {
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header( 'Expires: Wed, 11 Jan 1984 05:00:00 GMT' );
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header( 'Cache-Control: no-cache, must-revalidate, max-age=0' );
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}
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fastcgi_finish_request();
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}
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if ( ! empty( $_POST ) || defined( 'DOING_AJAX' ) || defined( 'DOING_CRON' ) ) {
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die();
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}
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/**
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* Tell WordPress we are doing the CRON task.
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*
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* @var bool
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*/
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define( 'DOING_CRON', true );
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if ( ! defined( 'ABSPATH' ) ) {
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/** Set up WordPress environment */
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require_once( dirname( __FILE__ ) . '/wp-load.php' );
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}
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/**
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* Retrieves the cron lock.
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*
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* Returns the uncached `doing_cron` transient.
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*
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* @ignore
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* @since 3.3.0
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*
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* @global wpdb $wpdb WordPress database abstraction object.
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*
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* @return string|false Value of the `doing_cron` transient, 0|false otherwise.
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*/
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function _get_cron_lock() {
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global $wpdb;
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$value = 0;
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if ( wp_using_ext_object_cache() ) {
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/*
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* Skip local cache and force re-fetch of doing_cron transient
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* in case another process updated the cache.
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*/
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$value = wp_cache_get( 'doing_cron', 'transient', true );
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} else {
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$row = $wpdb->get_row( $wpdb->prepare( "SELECT option_value FROM $wpdb->options WHERE option_name = %s LIMIT 1", '_transient_doing_cron' ) );
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if ( is_object( $row ) ) {
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$value = $row->option_value;
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}
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}
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return $value;
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}
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$crons = wp_get_ready_cron_jobs();
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if ( empty( $crons ) ) {
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die();
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}
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$gmt_time = microtime( true );
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// The cron lock: a unix timestamp from when the cron was spawned.
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$doing_cron_transient = get_transient( 'doing_cron' );
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// Use global $doing_wp_cron lock, otherwise use the GET lock. If no lock, try to grab a new lock.
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if ( empty( $doing_wp_cron ) ) {
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if ( empty( $_GET['doing_wp_cron'] ) ) {
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// Called from external script/job. Try setting a lock.
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if ( $doing_cron_transient && ( $doing_cron_transient + WP_CRON_LOCK_TIMEOUT > $gmt_time ) ) {
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return;
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}
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$doing_wp_cron = sprintf( '%.22F', microtime( true ) );
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$doing_cron_transient = $doing_wp_cron;
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set_transient( 'doing_cron', $doing_wp_cron );
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} else {
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$doing_wp_cron = $_GET['doing_wp_cron'];
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}
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}
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/*
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* The cron lock (a unix timestamp set when the cron was spawned),
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* must match $doing_wp_cron (the "key").
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*/
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if ( $doing_cron_transient != $doing_wp_cron ) {
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return;
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}
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foreach ( $crons as $timestamp => $cronhooks ) {
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if ( $timestamp > $gmt_time ) {
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break;
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}
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foreach ( $cronhooks as $hook => $keys ) {
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foreach ( $keys as $k => $v ) {
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$schedule = $v['schedule'];
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if ( $schedule ) {
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wp_reschedule_event( $timestamp, $schedule, $hook, $v['args'] );
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}
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wp_unschedule_event( $timestamp, $hook, $v['args'] );
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/**
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* Fires scheduled events.
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*
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* @ignore
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* @since 2.1.0
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*
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* @param string $hook Name of the hook that was scheduled to be fired.
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* @param array $args The arguments to be passed to the hook.
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*/
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do_action_ref_array( $hook, $v['args'] );
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// If the hook ran too long and another cron process stole the lock, quit.
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if ( _get_cron_lock() != $doing_wp_cron ) {
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return;
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}
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}
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}
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}
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if ( _get_cron_lock() == $doing_wp_cron ) {
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delete_transient( 'doing_cron' );
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}
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die();
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