From a11c108436c61696bd8dea5f27930fa3f85bcc44 Mon Sep 17 00:00:00 2001
From: Mikey O'Toole <mikey@mjco.uk>
Date: Thu, 25 Mar 2021 19:32:51 +0000
Subject: [PATCH] Rebuild the Drupal route cache.

This is linked to [issue 158](https://lab.civicrm.org/dev/drupal/-/issues/158) and [issue 37](https://lab.civicrm.org/dev/drupal/-/issues/37).

It takes an alternative approach, adding a Util hook function to rebuild the route cache which we can then invoke from multiple places.
Trigger `rebuildDrupalRouteCache()` when running `triggerRebuild()`
Fix checkstyle issues
Change function from `protected` to `public`
Update Drupal8.php
Add base for `invalidateRouteCache()`
Add invalidateRouteCache function
Add call to userFramework->invalidateRouteCache
Update Base.php
Correct `userFramework` to `userSystem`
Remove stray whitespace.
Move invalidateRouteCache call to the same place as resetNavigation.
Update Invoke.php
Switch to the `router.builder' option as invalidating the cache doesn't cut it.
---
 CRM/Core/Invoke.php          |  1 +
 CRM/Utils/System/Base.php    |  6 ++++++
 CRM/Utils/System/Drupal8.php | 10 ++++++++++
 3 files changed, 17 insertions(+)

diff --git a/CRM/Core/Invoke.php b/CRM/Core/Invoke.php
index bc537d6b26..6611dc00d5 100644
--- a/CRM/Core/Invoke.php
+++ b/CRM/Core/Invoke.php
@@ -394,6 +394,7 @@ class CRM_Core_Invoke {
       CRM_Utils_Request::retrieve('triggerRebuild', 'Boolean', CRM_Core_DAO::$_nullObject, FALSE, 0, 'GET')
     ) {
       CRM_Core_DAO::triggerRebuild();
+      $config->userSystem->invalidateRouteCache();
     }
     CRM_Core_DAO_AllCoreTables::reinitializeCache(TRUE);
     CRM_Core_ManagedEntities::singleton(TRUE)->reconcile();
diff --git a/CRM/Utils/System/Base.php b/CRM/Utils/System/Base.php
index e126a6d5f3..6a1ce83351 100644
--- a/CRM/Utils/System/Base.php
+++ b/CRM/Utils/System/Base.php
@@ -1012,4 +1012,10 @@ abstract class CRM_Utils_System_Base {
     return [];
   }
 
+  /**
+   * Invalidates the cache of dynamic routes and forces a rebuild.
+   */
+  public function invalidateRouteCache() {
+  }
+
 }
diff --git a/CRM/Utils/System/Drupal8.php b/CRM/Utils/System/Drupal8.php
index a7bb1aaede..a506c36b93 100644
--- a/CRM/Utils/System/Drupal8.php
+++ b/CRM/Utils/System/Drupal8.php
@@ -858,4 +858,14 @@ class CRM_Utils_System_Drupal8 extends CRM_Utils_System_DrupalBase {
     return \Drupal::entityTypeManager()->getStorage('user')->load($userID);
   }
 
+  /**
+   * Helper function to rebuild the Drupal 8 or 9 dynamic routing cache.
+   * We need to do this after enabling extensions that add routes and it's worth doing when we reset Civi paths.
+   */
+  public function invalidateRouteCache() {
+    if (class_exists('\Drupal') && \Drupal::hasContainer()) {
+      \Drupal::service('router.builder')->rebuild();
+    }
+  }
+
 }
-- 
2.25.1