docs: def _common(ret, name, service_name, kwargs):
      '''
      Returns: tuple whose first element is a bool indicating success or failure
               and the second element is either a ret dict for salt or an object
      '''
      if 'interface' not in kwargs and 'public_url' not in kwargs:
          kwargs['interface'] = name
      service = __salt__['keystoneng.service_get'](name_or_id=service_name)
  
      if not service:
          ret['comment'] = 'Cannot find service'
          ret['result'] = False
          return (False, ret)
  
      filters = kwargs.copy()
      filters.pop('enabled', None)
      filters.pop('url', None)
      filters['service_id'] = service.id
      kwargs['service_name_or_id'] = service.id
      endpoints = __salt__['keystoneng.endpoint_search'](filters=filters)
  
      if len(endpoints) > 1:
          ret['comment'] = "Multiple endpoints match criteria"
          ret['result'] = False
          return ret
      endpoint = endpoints[0] if endpoints else None
      return (True, endpoint)