old_contents: import diesel
  from aspen.server import BaseEngine
  from diesel.protocols import wsgi
  
  
  class Engine(BaseEngine):
  
      app = None # a diesel app instance
  
      def bind(self):
          self.app = wsgi.WSGIApplication( self.website
                                         , self.website.address[1]
                                         , self.website.address[0]
                                          )
  
      def start(self):
          self.app.run()
  
      def stop(self):
          try:
              self.app.halt()
          except diesel.app.ApplicationEnd:
              pass # Only you can prevent log spam.
  
      def start_restarter(self, check_all):
          def loop():
              while True:
                  check_all()
                  diesel.sleep(0.5)
          self.app.add_loop(diesel.Loop(loop))
  
new_contents: import diesel
  from aspen.server import BaseEngine
  from diesel.protocols import wsgi
  
  
  class Engine(BaseEngine):
  
      diesel_app = None # a diesel diesel_app instance
  
      def bind(self):
          self.diesel_app = wsgi.WSGIApplication( self.website
                                                , self.website.address[1]
                                                , self.website.address[0]
                                                 )
  
      def start(self):
          self.diesel_app.run()
  
      def stop(self):
          try:
              if self.diesel_app is not None:
                  self.diesel_app.halt()
          except diesel.app.ApplicationEnd:
              pass # Only you can prevent log spam.
  
      def start_restarter(self, check_all):
          def loop():
              while True:
                  check_all()
                  diesel.sleep(0.5)
          self.diesel_app.add_loop(diesel.Loop(loop))
  
subject: Reduce log spam from diesel.