tome-8.x-1.x-dev/modules/tome_static/modules/tome_static_cron/tome_static_cron.module

<?php

/**
 * @file
 * Contains hook implementations for the tome_static_cron module.
 */

use Drupal\tome_static\TomeStaticUrlHelper;
use Drupal\tome_static_cron\Plugin\QueueWorker\TomeStaticQueueWorker;

/**
 * Implements hook_cron().
 */
function tome_static_cron_cron() {
  $base_url = \Drupal::config('tome_static_cron.settings')->get('base_url');

  if (empty($base_url)) {
    return;
  }

  if (\Drupal::queue('tome_static_cron')->numberOfItems() > 0) {
    return;
  }

  if ($current_request = \Drupal::requestStack()->getCurrentRequest()) {
    $original_params = TomeStaticUrlHelper::setBaseUrl($current_request, $base_url);
  }

  \Drupal::state()->set(TomeStaticQueueWorker::STATE_KEY_INVOKE_PATHS, []);
  \Drupal::state()->set(TomeStaticQueueWorker::STATE_KEY_OLD_PATHS, []);

  /** @var \Drupal\tome_static\StaticGeneratorInterface $static */
  $static = \Drupal::service('tome_static.generator');
  $static->cleanupStaticDirectory();
  $static->prepareStaticDirectory();
  _tome_static_cron_queue_paths($static->exportPaths($static->getPaths()), $base_url);

  if ($current_request) {
    TomeStaticUrlHelper::restoreBaseUrl($current_request, $original_params);
  }
}

/**
 * Enqueues paths for static generation.
 *
 * Paths passed to this function should have already been passed to the
 * tome_static.generator service's exportPaths method.
 *
 * @param array $paths
 *   An array of paths to queue.
 * @param string $base_url
 *   The base URL.
 *
 * @internal
 */
function _tome_static_cron_queue_paths(array $paths, $base_url) {
  $old_paths = \Drupal::state()->get(TomeStaticQueueWorker::STATE_KEY_OLD_PATHS, []);
  $paths = array_diff($paths, $old_paths);
  if (!empty($paths)) {
    $queue = \Drupal::queue('tome_static_cron');
    foreach ($paths as $path) {
      $queue->createItem([
        'path' => $path,
        'base_url' => $base_url,
      ]);
    }
    $queue->createItem([
      'action' => 'process_invoke_paths',
      'base_url' => $base_url,
    ]);
    $old_paths = array_merge($paths, $old_paths);
  }
  \Drupal::state()->set(TomeStaticQueueWorker::STATE_KEY_OLD_PATHS, $old_paths);
}