X-Git-Url: https://scripts.mit.edu/gitweb/autoinstalls/wordpress.git/blobdiff_plain/76aea3697c6043c1613370f172395b4f65ee71f0..61343b82c4f0da4c68e4c6373daafff4a81efdd1:/wp-includes/cron.php

diff --git a/wp-includes/cron.php b/wp-includes/cron.php
index 6eff54a3..6668dc54 100644
--- a/wp-includes/cron.php
+++ b/wp-includes/cron.php
@@ -1,24 +1,97 @@
 <?php
-
+/**
+ * WordPress CRON API
+ *
+ * @package WordPress
+ */
+
+/**
+ * Schedules a hook to run only once.
+ *
+ * Schedules a hook which will be executed once by the WordPress actions core at
+ * a time which you specify. The action will fire off when someone visits your
+ * WordPress site, if the schedule time has passed.
+ *
+ * @since 2.1.0
+ * @link http://codex.wordpress.org/Function_Reference/wp_schedule_single_event
+ *
+ * @param int $timestamp Timestamp for when to run the event.
+ * @param string $hook Action hook to execute when cron is run.
+ * @param array $args Optional. Arguments to pass to the hook's callback function.
+ */
 function wp_schedule_single_event( $timestamp, $hook, $args = array()) {
+	// don't schedule a duplicate if there's already an identical event due in the next 10 minutes
+	$next = wp_next_scheduled($hook, $args);
+	if ( $next && $next <= $timestamp + 10 * MINUTE_IN_SECONDS )
+		return;
+
 	$crons = _get_cron_array();
-	$key = md5(serialize($args));
-	$crons[$timestamp][$hook][$key] = array( 'schedule' => false, 'args' => $args );
+	$event = (object) array( 'hook' => $hook, 'timestamp' => $timestamp, 'schedule' => false, 'args' => $args );
+	$event = apply_filters('schedule_event', $event);
+
+	// A plugin disallowed this event
+	if ( ! $event )
+		return false;
+
+	$key = md5(serialize($event->args));
+
+	$crons[$event->timestamp][$event->hook][$key] = array( 'schedule' => $event->schedule, 'args' => $event->args );
 	uksort( $crons, "strnatcasecmp" );
 	_set_cron_array( $crons );
 }
 
+/**
+ * Schedule a periodic event.
+ *
+ * Schedules a hook which will be executed by the WordPress actions core on a
+ * specific interval, specified by you. The action will trigger when someone
+ * visits your WordPress site, if the scheduled time has passed.
+ *
+ * Valid values for the recurrence are hourly, daily and twicedaily. These can
+ * be extended using the cron_schedules filter in wp_get_schedules().
+ *
+ * Use wp_next_scheduled() to prevent duplicates
+ *
+ * @since 2.1.0
+ *
+ * @param int $timestamp Timestamp for when to run the event.
+ * @param string $recurrence How often the event should recur.
+ * @param string $hook Action hook to execute when cron is run.
+ * @param array $args Optional. Arguments to pass to the hook's callback function.
+ * @return bool|null False on failure, null when complete with scheduling event.
+ */
 function wp_schedule_event( $timestamp, $recurrence, $hook, $args = array()) {
 	$crons = _get_cron_array();
 	$schedules = wp_get_schedules();
-	$key = md5(serialize($args));
+
 	if ( !isset( $schedules[$recurrence] ) )
 		return false;
-	$crons[$timestamp][$hook][$key] = array( 'schedule' => $recurrence, 'args' => $args, 'interval' => $schedules[$recurrence]['interval'] );
+
+	$event = (object) array( 'hook' => $hook, 'timestamp' => $timestamp, 'schedule' => $recurrence, 'args' => $args, 'interval' => $schedules[$recurrence]['interval'] );
+	$event = apply_filters('schedule_event', $event);
+
+	// A plugin disallowed this event
+	if ( ! $event )
+		return false;
+
+	$key = md5(serialize($event->args));
+
+	$crons[$event->timestamp][$event->hook][$key] = array( 'schedule' => $event->schedule, 'args' => $event->args, 'interval' => $event->interval );
 	uksort( $crons, "strnatcasecmp" );
 	_set_cron_array( $crons );
 }
 
+/**
+ * Reschedule a recurring event.
+ *
+ * @since 2.1.0
+ *
+ * @param int $timestamp Timestamp for when to run the event.
+ * @param string $recurrence How often the event should recur.
+ * @param string $hook Action hook to execute when cron is run.
+ * @param array $args Optional. Arguments to pass to the hook's callback function.
+ * @return bool|null False on failure. Null when event is rescheduled.
+ */
 function wp_reschedule_event( $timestamp, $recurrence, $hook, $args = array()) {
 	$crons = _get_cron_array();
 	$schedules = wp_get_schedules();
@@ -35,12 +108,31 @@ function wp_reschedule_event( $timestamp, $recurrence, $hook, $args = array()) {
 	if ( 0 == $interval )
 		return false;
 
-	while ( $timestamp < time() + 1 )
-		$timestamp += $interval;
+	$now = time();
+
+	if ( $timestamp >= $now )
+		$timestamp = $now + $interval;
+	else
+		$timestamp = $now + ($interval - (($now - $timestamp) % $interval));
 
 	wp_schedule_event( $timestamp, $recurrence, $hook, $args );
 }
 
+/**
+ * Unschedule a previously scheduled cron job.
+ *
+ * The $timestamp and $hook parameters are required, so that the event can be
+ * identified.
+ *
+ * @since 2.1.0
+ *
+ * @param int $timestamp Timestamp for when to run the event.
+ * @param string $hook Action hook, the execution of which will be unscheduled.
+ * @param array $args Arguments to pass to the hook's callback function.
+ * Although not passed to a callback function, these arguments are used
+ * to uniquely identify the scheduled event, so they should be the same
+ * as those used when originally scheduling the event.
+ */
 function wp_unschedule_event( $timestamp, $hook, $args = array() ) {
 	$crons = _get_cron_array();
 	$key = md5(serialize($args));
@@ -52,13 +144,35 @@ function wp_unschedule_event( $timestamp, $hook, $args = array() ) {
 	_set_cron_array( $crons );
 }
 
-function wp_clear_scheduled_hook( $hook ) {
-	$args = array_slice( func_get_args(), 1 );
+/**
+ * Unschedule all cron jobs attached to a specific hook.
+ *
+ * @since 2.1.0
+ *
+ * @param string $hook Action hook, the execution of which will be unscheduled.
+ * @param array $args Optional. Arguments that were to be pass to the hook's callback function.
+ */
+function wp_clear_scheduled_hook( $hook, $args = array() ) {
+	// Backward compatibility
+	// Previously this function took the arguments as discrete vars rather than an array like the rest of the API
+	if ( !is_array($args) ) {
+		_deprecated_argument( __FUNCTION__, '3.0', __('This argument has changed to an array to match the behavior of the other cron functions.') );
+		$args = array_slice( func_get_args(), 1 );
+	}
 
 	while ( $timestamp = wp_next_scheduled( $hook, $args ) )
 		wp_unschedule_event( $timestamp, $hook, $args );
 }
 
+/**
+ * Retrieve the next timestamp for a cron event.
+ *
+ * @since 2.1.0
+ *
+ * @param string $hook Action hook to execute when cron is run.
+ * @param array $args Optional. Arguments to pass to the hook's callback function.
+ * @return bool|int The UNIX timestamp of the next time the scheduled event will occur.
+ */
 function wp_next_scheduled( $hook, $args = array() ) {
 	$crons = _get_cron_array();
 	$key = md5(serialize($args));
@@ -71,74 +185,155 @@ function wp_next_scheduled( $hook, $args = array() ) {
 	return false;
 }
 
-function spawn_cron() {
-	$crons = _get_cron_array();
+/**
+ * Send request to run cron through HTTP request that doesn't halt page loading.
+ *
+ * @since 2.1.0
+ *
+ * @return null Cron could not be spawned, because it is not needed to run.
+ */
+function spawn_cron( $gmt_time = 0 ) {
+
+	if ( ! $gmt_time )
+		$gmt_time = microtime( true );
 
+	if ( defined('DOING_CRON') || isset($_GET['doing_wp_cron']) )
+		return;
+
+	/*
+	* multiple processes on multiple web servers can run this code concurrently
+	* try to make this as atomic as possible by setting doing_cron switch
+	*/
+	$lock = get_transient('doing_cron');
+
+	if ( $lock > $gmt_time + 10 * MINUTE_IN_SECONDS )
+		$lock = 0;
+
+	// don't run if another process is currently running it or more than once every 60 sec.
+	if ( $lock + WP_CRON_LOCK_TIMEOUT > $gmt_time )
+		return;
+
+	//sanity check
+	$crons = _get_cron_array();
 	if ( !is_array($crons) )
 		return;
 
 	$keys = array_keys( $crons );
-	if ( array_shift( $keys ) > time() )
+	if ( isset($keys[0]) && $keys[0] > $gmt_time )
 		return;
 
-	$cron_url = get_option( 'siteurl' ) . '/wp-cron.php';
-	$parts = parse_url( $cron_url );
+	if ( defined('ALTERNATE_WP_CRON') && ALTERNATE_WP_CRON ) {
+		if ( !empty($_POST) || defined('DOING_AJAX') )
+			return;
 
-	if ($parts['scheme'] == 'https') {
-		// support for SSL was added in 4.3.0
-		if (version_compare(phpversion(), '4.3.0', '>=') && function_exists('openssl_open')) {
-			$port = isset($parts['port']) ? $parts['port'] : 443;
-			$argyle = @fsockopen('ssl://' . $parts['host'], $port, $errno, $errstr, 0.01);
-		} else {
-			return false;
-		}
-	} else {
-		$port = isset($parts['port']) ? $parts['port'] : 80;
-		$argyle = @ fsockopen( $parts['host'], $port, $errno, $errstr, 0.01 );
+		$doing_wp_cron = sprintf( '%.22F', $gmt_time );
+		set_transient( 'doing_cron', $doing_wp_cron );
+
+		ob_start();
+		wp_redirect( add_query_arg( 'doing_wp_cron', $doing_wp_cron, wp_unslash( $_SERVER['REQUEST_URI'] ) ) );
+		echo ' ';
+
+		// flush any buffers and send the headers
+		while ( @ob_end_flush() );
+		flush();
+
+		WP_DEBUG ? include_once( ABSPATH . 'wp-cron.php' ) : @include_once( ABSPATH . 'wp-cron.php' );
+		return;
 	}
 
-	if ( $argyle )
-		fputs( $argyle,
-			  "GET {$parts['path']}?check=" . wp_hash('187425') . " HTTP/1.0\r\n"
-			. "Host: {$_SERVER['HTTP_HOST']}\r\n\r\n"
-		);
+	$doing_wp_cron = sprintf( '%.22F', $gmt_time );
+	set_transient( 'doing_cron', $doing_wp_cron );
+
+	$cron_request = apply_filters( 'cron_request', array(
+		'url' => site_url( 'wp-cron.php?doing_wp_cron=' . $doing_wp_cron ),
+		'key' => $doing_wp_cron,
+		'args' => array( 'timeout' => 0.01, 'blocking' => false, 'sslverify' => apply_filters( 'https_local_ssl_verify', true ) )
+	) );
+
+	wp_remote_post( $cron_request['url'], $cron_request['args'] );
 }
 
+/**
+ * Run scheduled callbacks or spawn cron for all scheduled events.
+ *
+ * @since 2.1.0
+ *
+ * @return null When doesn't need to run Cron.
+ */
 function wp_cron() {
+
 	// Prevent infinite loops caused by lack of wp-cron.php
-	if ( strpos($_SERVER['REQUEST_URI'], '/wp-cron.php') !== false )
+	if ( strpos($_SERVER['REQUEST_URI'], '/wp-cron.php') !== false || ( defined('DISABLE_WP_CRON') && DISABLE_WP_CRON ) )
 		return;
 
-	$crons = _get_cron_array();
-
-	if ( !is_array($crons) )
+	if ( false === $crons = _get_cron_array() )
 		return;
 
+	$gmt_time = microtime( true );
 	$keys = array_keys( $crons );
-	if ( isset($keys[0]) && $keys[0] > time() )
+	if ( isset($keys[0]) && $keys[0] > $gmt_time )
 		return;
 
 	$schedules = wp_get_schedules();
 	foreach ( $crons as $timestamp => $cronhooks ) {
-		if ( $timestamp > time() ) break;
-		foreach ( $cronhooks as $hook => $args ) {
+		if ( $timestamp > $gmt_time ) break;
+		foreach ( (array) $cronhooks as $hook => $args ) {
 			if ( isset($schedules[$hook]['callback']) && !call_user_func( $schedules[$hook]['callback'] ) )
 				continue;
-			spawn_cron();
+			spawn_cron( $gmt_time );
 			break 2;
 		}
 	}
 }
 
+/**
+ * Retrieve supported and filtered Cron recurrences.
+ *
+ * The supported recurrences are 'hourly' and 'daily'. A plugin may add more by
+ * hooking into the 'cron_schedules' filter. The filter accepts an array of
+ * arrays. The outer array has a key that is the name of the schedule or for
+ * example 'weekly'. The value is an array with two keys, one is 'interval' and
+ * the other is 'display'.
+ *
+ * The 'interval' is a number in seconds of when the cron job should run. So for
+ * 'hourly', the time is 3600 or 60*60. For weekly, the value would be
+ * 60*60*24*7 or 604800. The value of 'interval' would then be 604800.
+ *
+ * The 'display' is the description. For the 'weekly' key, the 'display' would
+ * be <code>__('Once Weekly')</code>.
+ *
+ * For your plugin, you will be passed an array. you can easily add your
+ * schedule by doing the following.
+ * <code>
+ * // filter parameter variable name is 'array'
+ *	$array['weekly'] = array(
+ *		'interval' => 604800,
+ *		'display' => __('Once Weekly')
+ *	);
+ * </code>
+ *
+ * @since 2.1.0
+ *
+ * @return array
+ */
 function wp_get_schedules() {
 	$schedules = array(
-		'hourly' => array( 'interval' => 3600, 'display' => __('Once Hourly') ),
-		'twicedaily' => array( 'interval' => 43200, 'display' => __('Twice Daily') ),
-		'daily' => array( 'interval' => 86400, 'display' => __('Once Daily') ),
+		'hourly'     => array( 'interval' => HOUR_IN_SECONDS,      'display' => __( 'Once Hourly' ) ),
+		'twicedaily' => array( 'interval' => 12 * HOUR_IN_SECONDS, 'display' => __( 'Twice Daily' ) ),
+		'daily'      => array( 'interval' => DAY_IN_SECONDS,       'display' => __( 'Once Daily' ) ),
 	);
 	return array_merge( apply_filters( 'cron_schedules', array() ), $schedules );
 }
 
+/**
+ * Retrieve Cron schedule for hook with arguments.
+ *
+ * @since 2.1.0
+ *
+ * @param string $hook Action hook to execute when cron is run.
+ * @param array $args Optional. Arguments to pass to the hook's callback function.
+ * @return string|bool False, if no schedule. Schedule on success.
+ */
 function wp_get_schedule($hook, $args = array()) {
 	$crons = _get_cron_array();
 	$key = md5(serialize($args));
@@ -155,6 +350,14 @@ function wp_get_schedule($hook, $args = array()) {
 // Private functions
 //
 
+/**
+ * Retrieve cron info array option.
+ *
+ * @since 2.1.0
+ * @access private
+ *
+ * @return array CRON info array.
+ */
 function _get_cron_array()  {
 	$cron = get_option('cron');
 	if ( ! is_array($cron) )
@@ -168,19 +371,38 @@ function _get_cron_array()  {
 	return $cron;
 }
 
+/**
+ * Updates the CRON option with the new CRON array.
+ *
+ * @since 2.1.0
+ * @access private
+ *
+ * @param array $cron Cron info array from {@link _get_cron_array()}.
+ */
 function _set_cron_array($cron) {
 	$cron['version'] = 2;
 	update_option( 'cron', $cron );
 }
 
+/**
+ * Upgrade a Cron info array.
+ *
+ * This function upgrades the Cron info array to version 2.
+ *
+ * @since 2.1.0
+ * @access private
+ *
+ * @param array $cron Cron info array from {@link _get_cron_array()}.
+ * @return array An upgraded Cron info array.
+ */
 function _upgrade_cron_array($cron) {
 	if ( isset($cron['version']) && 2 == $cron['version'])
 		return $cron;
 
 	$new_cron = array();
 
-	foreach ($cron as $timestamp => $hooks) {
-		foreach ( $hooks as $hook => $args ) {
+	foreach ( (array) $cron as $timestamp => $hooks) {
+		foreach ( (array) $hooks as $hook => $args ) {
 			$key = md5(serialize($args['args']));
 			$new_cron[$timestamp][$hook][$key] = $args;
 		}
@@ -190,5 +412,3 @@ function _upgrade_cron_array($cron) {
 	update_option( 'cron', $new_cron );
 	return $new_cron;
 }
-
-?>