Use etag caching for environments JSON

For the index view, the environments can now be requested every 15
seconds. Any transition state of a projects environments will trigger a
cache invalidation action.

Fixes gitlab-org/gitlab-ce#31701

1 files changed, 11 insertions, 0 deletions

diff --git a/app/models/environment.rb b/app/models/environment.rb
index 61572d8d69a..07722d9a59e 100644
--- a/app/models/environment.rb
+++ b/app/models/environment.rb
@@ -57,6 +57,10 @@ class Environment < ActiveRecord::Base
 
     state :available
     state :stopped
+
+    after_transition do |environment|
+      environment.expire_etag_cache
+    end
   end
 
   def predefined_variables
@@ -196,6 +200,13 @@ class Environment < ActiveRecord::Base
     [external_url, public_path].join('/')
   end
 
+  def expire_etag_cache
+    Gitlab::EtagCaching::Store.new.tap do |store|
+      store.touch(Gitlab::Routing.url_helpers
+        .namespace_project_environments_path(project.namespace, project))
+    end
+  end
+
   private
 
   # Slugifying a name may remove the uniqueness guarantee afforded by it being