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<?php |
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|
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namespace SyncBasalam; |
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|
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defined('ABSPATH') || exit; |
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|
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abstract class AsyncBackgroundProcess |
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{ |
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protected $action = 'async_process'; |
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|
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protected $identifier; |
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|
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protected $data = array(); |
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|
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protected $timeLimit = 30; |
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|
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protected $batchSize = 20; |
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|
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protected $cronHook; |
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|
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protected $cronInterval = 'every_5_minutes'; |
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|
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public function __construct() |
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{ |
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$this->identifier = $this->getIdentifier(); |
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$this->cronHook = $this->identifier . '_cron'; |
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|
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add_filter('cron_schedules', array($this, 'addCronInterval')); |
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|
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add_action('wp_ajax_' . $this->identifier, array($this, 'handleAsyncRequest')); |
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add_action('wp_ajax_nopriv_' . $this->identifier, array($this, 'handleAsyncRequest')); |
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add_action($this->cronHook, array($this, 'handleCronHealthcheck')); |
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|
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$this->init(); |
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} |
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|
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protected function init() {} |
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|
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protected function getIdentifier() |
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{ |
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return $this->action . '_' . substr(md5(get_class($this)), 0, 8); |
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} |
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|
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public function addCronInterval($schedules) |
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{ |
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$schedules['every_5_minutes'] = array( |
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'interval' => 300, |
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'display' => __('Every 5 Minutes') |
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); |
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|
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$schedules['every_minute'] = array( |
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'interval' => 60, |
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'display' => __('Every Minute') |
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); |
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|
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return $schedules; |
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} |
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|
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public function push($item) |
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{ |
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$this->data[] = $item; |
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return $this; |
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} |
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|
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public function save() |
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{ |
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$key = $this->getBatchKey(); |
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|
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if (!empty($this->data)) { |
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update_option($key, $this->data, false); |
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} |
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|
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$this->data = array(); |
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|
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return $this; |
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} |
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|
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public function dispatch() |
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{ |
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|
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if (!wp_next_scheduled($this->cronHook)) { |
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wp_schedule_event(time(), $this->cronInterval, $this->cronHook); |
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} |
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|
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return $this->triggerAsyncRequest(); |
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} |
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|
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protected function triggerAsyncRequest() |
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{ |
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$url = add_query_arg( |
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array( |
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'action' => $this->identifier, |
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'nonce' => wp_create_nonce($this->identifier) |
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), |
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admin_url('admin-ajax.php') |
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); |
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|
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$args = array( |
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'timeout' => 0.01, |
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'blocking' => false, |
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'body' => array( |
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'action' => $this->identifier, |
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'nonce' => wp_create_nonce($this->identifier) |
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), |
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'cookies' => $_COOKIE, |
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'sslverify' => apply_filters('https_local_ssl_verify', false), |
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'headers' => array( |
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'X-WP-Async-Request' => $this->identifier |
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) |
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); |
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|
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$result = wp_remote_post(esc_url_raw($url), $args); |
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|
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if (is_wp_error($result)) return $this->triggerAlternativeAsync(); |
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|
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return $result; |
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} |
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|
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protected function triggerAlternativeAsync() |
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{ |
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wp_schedule_single_event(time(), $this->identifier . '_immediate'); |
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add_action($this->identifier . '_immediate', array($this, 'handleAsyncRequest')); |
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|
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spawn_cron(); |
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|
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return true; |
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} |
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|
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public function handleAsyncRequest() |
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{ |
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session_write_close(); |
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if (!$this->isProcessing()) { |
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$this->handle(); |
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} |
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} |
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|
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public function handleCronHealthcheck() |
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{ |
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if ($this->isQueueEmpty()) { |
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|
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$this->clearScheduledEvent(); |
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return; |
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} |
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|
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$this->triggerAsyncRequest(); |
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} |
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|
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protected function handle() |
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{ |
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|
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$this->lockProcess(); |
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|
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$batch = $this->getBatch(); |
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|
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if (empty($batch)) { |
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$this->unlockProcess(); |
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return; |
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} |
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|
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$startTime = time(); |
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|
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foreach ($batch as $key => $item) { |
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if ($this->timeExceeded($startTime)) { |
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break; |
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} |
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|
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if ($this->memoryExceeded()) { |
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break; |
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} |
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|
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$item = $this->task($item); |
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|
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if (false === $item) { |
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unset($batch[$key]); |
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} else { |
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$batch[$key] = $item; |
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} |
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} |
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|
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if (!empty($batch)) { |
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|
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$this->updateBatch($batch); |
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} else { |
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|
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$this->deleteBatch(); |
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} |
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|
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$this->unlockProcess(); |
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|
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if (!$this->isQueueEmpty()) { |
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|
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$this->dispatch(); |
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} else { |
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|
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$this->complete(); |
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$this->clearScheduledEvent(); |
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} |
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} |
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|
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abstract protected function task($item); |
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|
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protected function complete() {} |
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|
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protected function getBatch() |
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{ |
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global $wpdb; |
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|
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$table = $wpdb->options; |
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$keyPattern = $this->identifier . '_batch_%'; |
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|
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$query = $wpdb->prepare(" |
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SELECT option_name, option_value |
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FROM {$table} |
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WHERE option_name LIKE %s |
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ORDER BY option_name ASC |
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LIMIT 1 |
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", $keyPattern); |
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|
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$batch = $wpdb->get_row($query); |
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|
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if (empty($batch)) return array(); |
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|
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$batchData = maybe_unserialize($batch->option_value); |
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|
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if (!is_array($batchData)) return array(); |
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|
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return array_slice($batchData, 0, $this->batchSize, true); |
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} |
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|
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protected function updateBatch($batch) |
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{ |
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$batches = $this->getBatches(); |
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|
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if (!empty($batches)) { |
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$firstBatch = array_shift($batches); |
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update_option($firstBatch->option_name, $batch, false); |
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} |
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} |
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|
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protected function deleteBatch() |
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{ |
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$batches = $this->getBatches(); |
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|
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if (!empty($batches)) { |
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$firstBatch = array_shift($batches); |
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delete_option($firstBatch->option_name); |
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} |
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} |
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|
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protected function getBatches() |
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{ |
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global $wpdb; |
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|
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$table = $wpdb->options; |
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$keyPattern = $this->identifier . '_batch_%'; |
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|
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return $wpdb->get_results( |
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$wpdb->prepare(" |
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SELECT option_name |
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FROM {$table} |
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WHERE option_name LIKE %s |
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ORDER BY option_name ASC |
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", $keyPattern) |
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); |
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} |
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|
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protected function getBatchKey() |
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{ |
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$key = $this->identifier . '_batch_' . md5(microtime() . mt_rand()); |
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|
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$count = 1; |
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while (get_option($key) !== false) { |
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$key = $this->identifier . '_batch_' . md5(microtime() . mt_rand() . $count); |
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$count++; |
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} |
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|
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return $key; |
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} |
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|
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protected function isQueueEmpty() |
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{ |
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$batches = $this->getBatches(); |
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return empty($batches); |
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} |
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|
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protected function lockProcess() |
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{ |
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$lockKey = $this->identifier . '_lock'; |
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$lockDuration = 60; |
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|
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$lock = get_transient($lockKey); |
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|
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if ($lock) return false; |
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|
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set_transient($lockKey, microtime(true), $lockDuration); |
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|
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return true; |
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} |
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|
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protected function unlockProcess() |
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{ |
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delete_transient($this->identifier . '_lock'); |
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} |
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|
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protected function isProcessing() |
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{ |
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return (bool) get_transient($this->identifier . '_lock'); |
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} |
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|
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protected function timeExceeded($startTime) |
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{ |
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$timeLimit = ini_get('max_execution_time'); |
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|
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if (empty($timeLimit) || $timeLimit > $this->timeLimit) { |
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$timeLimit = $this->timeLimit; |
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} |
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|
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$timeLimit = $timeLimit - 5; |
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|
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return (time() - $startTime) > $timeLimit; |
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} |
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|
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protected function memoryExceeded() |
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{ |
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$memoryLimit = ini_get('memory_limit'); |
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|
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if ($memoryLimit == '-1') return false; |
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|
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$memoryLimit = $this->convertToBytes($memoryLimit); |
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$currentMemory = memory_get_usage(true); |
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|
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$buffer = 10 * 1024 * 1024; |
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|
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return ($currentMemory + $buffer) > $memoryLimit; |
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} |
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|
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protected function convertToBytes($value) |
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{ |
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$value = strtolower(trim($value)); |
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$bytes = (int) $value; |
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|
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if (strpos($value, 'g') !== false) { |
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$bytes *= 1024 * 1024 * 1024; |
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} elseif (strpos($value, 'm') !== false) { |
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$bytes *= 1024 * 1024; |
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} elseif (strpos($value, 'k') !== false) { |
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$bytes *= 1024; |
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} |
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|
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return $bytes; |
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} |
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|
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protected function clearScheduledEvent() |
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{ |
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$timestamp = wp_next_scheduled($this->cronHook); |
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|
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if ($timestamp) { |
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wp_unschedule_event($timestamp, $this->cronHook); |
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} |
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} |
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|
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public function cancel() |
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{ |
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$batches = $this->getBatches(); |
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|
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foreach ($batches as $batch) { |
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delete_option($batch->option_name); |
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} |
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|
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$this->clearScheduledEvent(); |
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|
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$this->unlockProcess(); |
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} |
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|
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public function isActive() |
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{ |
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if (get_transient($this->identifier . '_lock')) return true; |
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|
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$batches = $this->getBatches(); |
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|
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$hasScheduledCron = wp_next_scheduled($this->cronHook) !== false; |
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|
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return !empty($batches) || $hasScheduledCron; |
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} |
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|
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public function countBatches() |
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{ |
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$batches = $this->getBatches(); |
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return count($batches); |
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} |
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} |
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|
