Added RequestStore caching to Gitlab::Geo

lib/gitlab/geo.rb

 module Gitlab
   module Geo
     def self.current_node
-      GeoNode.find_by(host: Gitlab.config.gitlab.host,
-                      port: Gitlab.config.gitlab.port,
-                      relative_url_root: Gitlab.config.gitlab.relative_url_root)
+      RequestStore.store[:geo_node_current] ||= begin
+        GeoNode.find_by(host: Gitlab.config.gitlab.host,
+                        port: Gitlab.config.gitlab.port,
+                        relative_url_root: Gitlab.config.gitlab.relative_url_root)
+      end
     end
 
     def self.primary_node
-      GeoNode.find_by(primary: true)
+      RequestStore.store[:geo_node_primary] ||= GeoNode.find_by(primary: true)
     end
 
     def self.enabled?
-      GeoNode.exists?
+      RequestStore.store[:geo_node_enabled] ||= GeoNode.exists?
     end
 
     def self.readonly?
-      self.enabled? && !self.current_node.primary?
+      RequestStore.store[:geo_node_readonly] ||= self.enabled? && !self.current_node.primary?
     end
 
     def self.geo_node?(host:, port:)

spec/support/request_store.rb

+RSpec.configure do |config|
+  config.before(:each) do
+    RequestStore.clear!
+  end
+end