valet.module

<?php

/**
 * @file
 * Contains valet.module.
 */

use Drupal\Core\Cache\Cache;
use Drupal\user\RoleInterface;

/**
 * Implements hook_page_bottom().
 *
 * Add valet markup to the bottom of the page automatically.
 */
function valet_page_bottom(array &$page_bottom) {
  if (\Drupal::currentUser()->hasPermission('access valet')) {
    $page_bottom['valet'] = [
      '#type' => 'valet',
      '#cache' => [
        'keys' => ['valet'],
        'contexts' => ['user.permissions'],
        'tags' => ['valet'],
      ],
    ];
  }
}

/**
 * Implements hook_theme().
 */
function valet_theme() {
  return [
    'valet' => [
      'render element' => 'element',
    ],
  ];
}

/**
 * Implements hook_ENTITY_TYPE_presave().
 */
function valet_user_role_presave(RoleInterface $role) {
  valet_cache_flush();
}

/**
 * Implements hook_modules_installed().
 */
function valet_modules_installed($modules, $is_syncing) {
  valet_cache_flush();
}

/**
 * Implements hook_modules_uninstalled().
 */
function valet_modules_uninstalled($modules, $is_syncing) {
  valet_cache_flush();
}

/**
 * Implements hook_cache_flush().
 */
function valet_cache_flush() {
  Cache::invalidateTags(['valet', 'valet_resources']);
  // Reset cache.
  valet_reset_cache_id();
}

/**
 * Reset the cache id.
 */
function valet_reset_cache_id() {
  $set = &drupal_static(__FUNCTION__, FALSE);
  if (!$set) {
    $set = TRUE;
    Drupal::state()->set('valet.cache_id', base_convert(\Drupal::time()->getRequestTime(), 10, 36));
  }
}