Add HasSeeds util module for client/service

plugins/commands/serve/util.rb

@@ -8,6 +8,7 @@ module VagrantPlugins
       autoload :HasBroker, Vagrant.source_root.join("plugins/commands/serve/util/has_broker").to_s
       autoload :HasLogger, Vagrant.source_root.join("plugins/commands/serve/util/has_logger").to_s
       autoload :HasMapper, Vagrant.source_root.join("plugins/commands/serve/util/has_mapper").to_s
+      autoload :HasSeeds, Vagrant.source_root.join("plugins/commands/serve/util/has_seeds").to_s
       autoload :ServiceInfo, Vagrant.source_root.join("plugins/commands/serve/util/service_info").to_s
 
       module WithMapper

plugins/commands/serve/util/has_seeds.rb

@@ -0,0 +1,34 @@
+module VagrantPlugins
+  module CommandServe
+    module Util
+      module HasSeeds
+        # Provides seed value registration.
+        module Service
+          def seed(req, ctx)
+            logger.info("ruby side received seed through service - #{req.inspect}")
+            @seeds = req
+            Empty.new
+          end
+
+          def seeds(req, ctx)
+            logger.info("ruby side received seed request through service - #{@seeds.inspect}")
+            return SDK::Args::Seeds.new if @seeds.nil?
+            @seeds
+          end
+        end
+
+        # Provides seed access.
+        module Client
+          def seed(*args)
+            raise NotImplementedError,
+              "Seeding is currently not supported via Ruby client"
+          end
+
+          def seeds
+            client.seeds(Empty.new)
+          end
+        end
+      end
+    end
+  end
+end