Add more instance stats APIs (#6125)

* Add GET /api/v1/instance/peers API to reveal known domains

* Add GET /api/v1/instance/activity API

* Make new APIs disableable, exclude private statuses from activity stats

* Fix code style issue

* Fix week timestamps

1 files changed, 9 insertions, 0 deletions

diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index a213302cb..51a978f44 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -121,4 +121,13 @@ class ApplicationController < ActionController::Base
       end
     end
   end
+
+  def render_cached_json(cache_key, **options)
+    data = Rails.cache.fetch(cache_key, { raw: true }.merge(options)) do
+      yield.to_json
+    end
+
+    expires_in options[:expires_in], public: true
+    render json: data
+  end
 end