198 lines
7.4 KiB
PHP
198 lines
7.4 KiB
PHP
<?php
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/**
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* Class ActionScheduler_QueueRunner
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*/
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class ActionScheduler_QueueRunner extends ActionScheduler_Abstract_QueueRunner {
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const WP_CRON_HOOK = 'action_scheduler_run_queue';
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const WP_CRON_SCHEDULE = 'every_minute';
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/** @var ActionScheduler_AsyncRequest_QueueRunner */
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protected $async_request;
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/** @var ActionScheduler_QueueRunner */
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private static $runner = null;
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/**
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* @return ActionScheduler_QueueRunner
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* @codeCoverageIgnore
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*/
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public static function instance() {
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if ( empty(self::$runner) ) {
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$class = apply_filters('action_scheduler_queue_runner_class', 'ActionScheduler_QueueRunner');
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self::$runner = new $class();
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}
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return self::$runner;
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}
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/**
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* ActionScheduler_QueueRunner constructor.
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*
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* @param ActionScheduler_Store $store
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* @param ActionScheduler_FatalErrorMonitor $monitor
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* @param ActionScheduler_QueueCleaner $cleaner
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*/
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public function __construct( ActionScheduler_Store $store = null, ActionScheduler_FatalErrorMonitor $monitor = null, ActionScheduler_QueueCleaner $cleaner = null, ActionScheduler_AsyncRequest_QueueRunner $async_request = null ) {
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parent::__construct( $store, $monitor, $cleaner );
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if ( is_null( $async_request ) ) {
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$async_request = new ActionScheduler_AsyncRequest_QueueRunner( $this->store );
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}
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$this->async_request = $async_request;
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}
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/**
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* @codeCoverageIgnore
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*/
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public function init() {
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add_filter( 'cron_schedules', array( self::instance(), 'add_wp_cron_schedule' ) );
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// Check for and remove any WP Cron hook scheduled by Action Scheduler < 3.0.0, which didn't include the $context param
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$next_timestamp = wp_next_scheduled( self::WP_CRON_HOOK );
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if ( $next_timestamp ) {
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wp_unschedule_event( $next_timestamp, self::WP_CRON_HOOK );
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}
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$cron_context = array( 'WP Cron' );
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if ( ! wp_next_scheduled( self::WP_CRON_HOOK, $cron_context ) ) {
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$schedule = apply_filters( 'action_scheduler_run_schedule', self::WP_CRON_SCHEDULE );
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wp_schedule_event( time(), $schedule, self::WP_CRON_HOOK, $cron_context );
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}
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add_action( self::WP_CRON_HOOK, array( self::instance(), 'run' ) );
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$this->hook_dispatch_async_request();
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}
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/**
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* Hook check for dispatching an async request.
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*/
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public function hook_dispatch_async_request() {
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add_action( 'shutdown', array( $this, 'maybe_dispatch_async_request' ) );
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}
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/**
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* Unhook check for dispatching an async request.
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*/
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public function unhook_dispatch_async_request() {
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remove_action( 'shutdown', array( $this, 'maybe_dispatch_async_request' ) );
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}
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/**
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* Check if we should dispatch an async request to process actions.
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*
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* This method is attached to 'shutdown', so is called frequently. To avoid slowing down
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* the site, it mitigates the work performed in each request by:
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* 1. checking if it's in the admin context and then
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* 2. haven't run on the 'shutdown' hook within the lock time (60 seconds by default)
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* 3. haven't exceeded the number of allowed batches.
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*
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* The order of these checks is important, because they run from a check on a value:
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* 1. in memory - is_admin() maps to $GLOBALS or the WP_ADMIN constant
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* 2. in memory - transients use autoloaded options by default
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* 3. from a database query - has_maximum_concurrent_batches() run the query
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* $this->store->get_claim_count() to find the current number of claims in the DB.
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*
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* If all of these conditions are met, then we request an async runner check whether it
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* should dispatch a request to process pending actions.
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*/
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public function maybe_dispatch_async_request() {
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if ( is_admin() && ! ActionScheduler::lock()->is_locked( 'async-request-runner' ) ) {
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// Only start an async queue at most once every 60 seconds
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ActionScheduler::lock()->set( 'async-request-runner' );
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$this->async_request->maybe_dispatch();
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}
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}
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/**
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* Process actions in the queue. Attached to self::WP_CRON_HOOK i.e. 'action_scheduler_run_queue'
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*
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* The $context param of this method defaults to 'WP Cron', because prior to Action Scheduler 3.0.0
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* that was the only context in which this method was run, and the self::WP_CRON_HOOK hook had no context
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* passed along with it. New code calling this method directly, or by triggering the self::WP_CRON_HOOK,
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* should set a context as the first parameter. For an example of this, refer to the code seen in
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* @see ActionScheduler_AsyncRequest_QueueRunner::handle()
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*
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* @param string $context Optional identifer for the context in which this action is being processed, e.g. 'WP CLI' or 'WP Cron'
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* Generally, this should be capitalised and not localised as it's a proper noun.
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* @return int The number of actions processed.
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*/
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public function run( $context = 'WP Cron' ) {
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ActionScheduler_Compatibility::raise_memory_limit();
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ActionScheduler_Compatibility::raise_time_limit( $this->get_time_limit() );
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do_action( 'action_scheduler_before_process_queue' );
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$this->run_cleanup();
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$processed_actions = 0;
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if ( false === $this->has_maximum_concurrent_batches() ) {
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$batch_size = apply_filters( 'action_scheduler_queue_runner_batch_size', 25 );
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do {
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$processed_actions_in_batch = $this->do_batch( $batch_size, $context );
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$processed_actions += $processed_actions_in_batch;
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} while ( $processed_actions_in_batch > 0 && ! $this->batch_limits_exceeded( $processed_actions ) ); // keep going until we run out of actions, time, or memory
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}
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do_action( 'action_scheduler_after_process_queue' );
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return $processed_actions;
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}
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/**
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* Process a batch of actions pending in the queue.
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*
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* Actions are processed by claiming a set of pending actions then processing each one until either the batch
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* size is completed, or memory or time limits are reached, defined by @see $this->batch_limits_exceeded().
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*
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* @param int $size The maximum number of actions to process in the batch.
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* @param string $context Optional identifer for the context in which this action is being processed, e.g. 'WP CLI' or 'WP Cron'
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* Generally, this should be capitalised and not localised as it's a proper noun.
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* @return int The number of actions processed.
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*/
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protected function do_batch( $size = 100, $context = '' ) {
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$claim = $this->store->stake_claim($size);
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$this->monitor->attach($claim);
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$processed_actions = 0;
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foreach ( $claim->get_actions() as $action_id ) {
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// bail if we lost the claim
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if ( ! in_array( $action_id, $this->store->find_actions_by_claim_id( $claim->get_id() ) ) ) {
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break;
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}
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$this->process_action( $action_id, $context );
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$processed_actions++;
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if ( $this->batch_limits_exceeded( $processed_actions ) ) {
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break;
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}
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}
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$this->store->release_claim($claim);
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$this->monitor->detach();
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$this->clear_caches();
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return $processed_actions;
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}
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/**
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* Running large batches can eat up memory, as WP adds data to its object cache.
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*
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* If using a persistent object store, this has the side effect of flushing that
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* as well, so this is disabled by default. To enable:
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*
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* add_filter( 'action_scheduler_queue_runner_flush_cache', '__return_true' );
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*/
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protected function clear_caches() {
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if ( ! wp_using_ext_object_cache() || apply_filters( 'action_scheduler_queue_runner_flush_cache', false ) ) {
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wp_cache_flush();
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}
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}
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public function add_wp_cron_schedule( $schedules ) {
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$schedules['every_minute'] = array(
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'interval' => 60, // in seconds
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'display' => __( 'Every minute', 'action-scheduler' ),
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);
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return $schedules;
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}
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}
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