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wp-cron.php in trunk/src
– WordPress Trac
source:
trunk/src/wp-cron.php
source:
trunk/src/wp-cron.php
| Last change on this file was 58842, checked in by SergeyBiryukov, 15 months ago | |
|---|---|
|
Docs: Improve the wording for
Follow-up to [54258].
Props NekoJonez, audrasjb. |
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| File size: 5.5 KB | |
| Line | |
|---|---|
| 1 | <?php |
| 2 | /** |
| 3 | * A pseudo-cron daemon for scheduling WordPress tasks. |
| 4 | * |
| 5 | * WP-Cron is triggered when the site receives a visit. In the scenario |
| 6 | * where a site may not receive enough visits to execute scheduled tasks |
| 7 | * in a timely manner, this file can be called directly or via a server |
| 8 | * cron daemon for X number of times. |
| 9 | * |
| 10 | * Defining DISABLE_WP_CRON as true and calling this file directly are |
| 11 | * mutually exclusive and the latter does not rely on the former to work. |
| 12 | * |
| 13 | * The HTTP request to this file will not slow down the visitor who happens to |
| 14 | * visit when a scheduled cron event runs. |
| 15 | * |
| 16 | * @package WordPress |
| 17 | */ |
| 18 | |
| 19 | ignore_user_abort( true ); |
| 20 | |
| 21 | if ( ! headers_sent() ) { |
| 22 | header( 'Expires: Wed, 11 Jan 1984 05:00:00 GMT' ); |
| 23 | header( 'Cache-Control: no-cache, must-revalidate, max-age=0' ); |
| 24 | } |
| 25 | |
| 26 | // Don't run cron until the request finishes, if possible. |
| 27 | if ( function_exists( 'fastcgi_finish_request' ) ) { |
| 28 | fastcgi_finish_request(); |
| 29 | } elseif ( function_exists( 'litespeed_finish_request' ) ) { |
| 30 | litespeed_finish_request(); |
| 31 | } |
| 32 | |
| 33 | if ( ! empty( $_POST ) || defined( 'DOING_AJAX' ) || defined( 'DOING_CRON' ) ) { |
| 34 | die(); |
| 35 | } |
| 36 | |
| 37 | /** |
| 38 | * Tell WordPress the cron task is running. |
| 39 | * |
| 40 | * @var bool |
| 41 | */ |
| 42 | define( 'DOING_CRON', true ); |
| 43 | |
| 44 | if ( ! defined( 'ABSPATH' ) ) { |
| 45 | /** Set up WordPress environment */ |
| 46 | require_once __DIR__ . '/wp-load.php'; |
| 47 | } |
| 48 | |
| 49 | // Attempt to raise the PHP memory limit for cron event processing. |
| 50 | wp_raise_memory_limit( 'cron' ); |
| 51 | |
| 52 | /** |
| 53 | * Retrieves the cron lock. |
| 54 | * |
| 55 | * Returns the uncached `doing_cron` transient. |
| 56 | * |
| 57 | * @ignore |
| 58 | * @since 3.3.0 |
| 59 | * |
| 60 | * @global wpdb $wpdb WordPress database abstraction object. |
| 61 | * |
| 62 | * @return string|int|false Value of the `doing_cron` transient, 0|false otherwise. |
| 63 | */ |
| 64 | function _get_cron_lock() { |
| 65 | global $wpdb; |
| 66 | |
| 67 | $value = 0; |
| 68 | if ( wp_using_ext_object_cache() ) { |
| 69 | /* |
| 70 | * Skip local cache and force re-fetch of doing_cron transient |
| 71 | * in case another process updated the cache. |
| 72 | */ |
| 73 | $value = wp_cache_get( 'doing_cron', 'transient', true ); |
| 74 | } else { |
| 75 | $row = $wpdb->get_row( $wpdb->prepare( "SELECT option_value FROM $wpdb->options WHERE option_name = %s LIMIT 1", '_transient_doing_cron' ) ); |
| 76 | if ( is_object( $row ) ) { |
| 77 | $value = $row->option_value; |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | return $value; |
| 82 | } |
| 83 | |
| 84 | $crons = wp_get_ready_cron_jobs(); |
| 85 | if ( empty( $crons ) ) { |
| 86 | die(); |
| 87 | } |
| 88 | |
| 89 | $gmt_time = microtime( true ); |
| 90 | |
| 91 | // The cron lock: a unix timestamp from when the cron was spawned. |
| 92 | $doing_cron_transient = get_transient( 'doing_cron' ); |
| 93 | |
| 94 | // Use global $doing_wp_cron lock, otherwise use the GET lock. If no lock, try to grab a new lock. |
| 95 | if ( empty( $doing_wp_cron ) ) { |
| 96 | if ( empty( $_GET['doing_wp_cron'] ) ) { |
| 97 | // Called from external script/job. Try setting a lock. |
| 98 | if ( $doing_cron_transient && ( $doing_cron_transient + WP_CRON_LOCK_TIMEOUT > $gmt_time ) ) { |
| 99 | return; |
| 100 | } |
| 101 | $doing_wp_cron = sprintf( '%.22F', microtime( true ) ); |
| 102 | $doing_cron_transient = $doing_wp_cron; |
| 103 | set_transient( 'doing_cron', $doing_wp_cron ); |
| 104 | } else { |
| 105 | $doing_wp_cron = $_GET['doing_wp_cron']; |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | /* |
| 110 | * The cron lock (a unix timestamp set when the cron was spawned), |
| 111 | * must match $doing_wp_cron (the "key"). |
| 112 | */ |
| 113 | if ( $doing_cron_transient !== $doing_wp_cron ) { |
| 114 | return; |
| 115 | } |
| 116 | |
| 117 | foreach ( $crons as $timestamp => $cronhooks ) { |
| 118 | if ( $timestamp > $gmt_time ) { |
| 119 | break; |
| 120 | } |
| 121 | |
| 122 | foreach ( $cronhooks as $hook => $keys ) { |
| 123 | |
| 124 | foreach ( $keys as $k => $v ) { |
| 125 | |
| 126 | $schedule = $v['schedule']; |
| 127 | |
| 128 | if ( $schedule ) { |
| 129 | $result = wp_reschedule_event( $timestamp, $schedule, $hook, $v['args'], true ); |
| 130 | |
| 131 | if ( is_wp_error( $result ) ) { |
| 132 | error_log( |
| 133 | sprintf( |
| 134 | /* translators: 1: Hook name, 2: Error code, 3: Error message, 4: Event data. */ |
| 135 | __( 'Cron reschedule event error for hook: %1$s, Error code: %2$s, Error message: %3$s, Data: %4$s' ), |
| 136 | $hook, |
| 137 | $result->get_error_code(), |
| 138 | $result->get_error_message(), |
| 139 | wp_json_encode( $v ) |
| 140 | ) |
| 141 | ); |
| 142 | |
| 143 | /** |
| 144 | * Fires if an error happens when rescheduling a cron event. |
| 145 | * |
| 146 | * @since 6.1.0 |
| 147 | * |
| 148 | * @param WP_Error $result The WP_Error object. |
| 149 | * @param string $hook Action hook to execute when the event is run. |
| 150 | * @param array $v Event data. |
| 151 | */ |
| 152 | do_action( 'cron_reschedule_event_error', $result, $hook, $v ); |
| 153 | } |
| 154 | } |
| 155 | |
| 156 | $result = wp_unschedule_event( $timestamp, $hook, $v['args'], true ); |
| 157 | |
| 158 | if ( is_wp_error( $result ) ) { |
| 159 | error_log( |
| 160 | sprintf( |
| 161 | /* translators: 1: Hook name, 2: Error code, 3: Error message, 4: Event data. */ |
| 162 | __( 'Cron unschedule event error for hook: %1$s, Error code: %2$s, Error message: %3$s, Data: %4$s' ), |
| 163 | $hook, |
| 164 | $result->get_error_code(), |
| 165 | $result->get_error_message(), |
| 166 | wp_json_encode( $v ) |
| 167 | ) |
| 168 | ); |
| 169 | |
| 170 | /** |
| 171 | * Fires if an error happens when unscheduling a cron event. |
| 172 | * |
| 173 | * @since 6.1.0 |
| 174 | * |
| 175 | * @param WP_Error $result The WP_Error object. |
| 176 | * @param string $hook Action hook to execute when the event is run. |
| 177 | * @param array $v Event data. |
| 178 | */ |
| 179 | do_action( 'cron_unschedule_event_error', $result, $hook, $v ); |
| 180 | } |
| 181 | |
| 182 | /** |
| 183 | * Fires scheduled events. |
| 184 | * |
| 185 | * @ignore |
| 186 | * @since 2.1.0 |
| 187 | * |
| 188 | * @param string $hook Name of the hook that was scheduled to be fired. |
| 189 | * @param array $args The arguments to be passed to the hook. |
| 190 | */ |
| 191 | do_action_ref_array( $hook, $v['args'] ); |
| 192 | |
| 193 | // If the hook ran too long and another cron process stole the lock, quit. |
| 194 | if ( _get_cron_lock() !== $doing_wp_cron ) { |
| 195 | return; |
| 196 | } |
| 197 | } |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | if ( _get_cron_lock() === $doing_wp_cron ) { |
| 202 | delete_transient( 'doing_cron' ); |
| 203 | } |
| 204 | |
| 205 | die(); |
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