code: def rpc_get_num_names_in_namespace( self, namespace_id, **con_info ):
          
          if not check_namespace(namespace_id):
              return {'error': 'Invalid name or namespace', 'http_status': 400}
  
          db = get_db_state(self.working_dir)
          num_names = db.get_num_names_in_namespace( namespace_id )
          db.close()
  
          return self.success_response( {'count': num_names} )
docs: Get the number of names in a namespace
          Return {'status': true, 'count': count} on success
          Return {'error': ...} on error