code: def create_service_from_endpoint(endpoint, service_type, title=None, abstract=None, catalog=None):
      
      from models import Service
      if Service.objects.filter(url=endpoint, catalog=catalog).count() == 0:
          # check if endpoint is valid
          request = requests.get(endpoint)
          if request.status_code == 200:
              LOGGER.debug('Creating a %s service for endpoint=%s catalog=%s' % (service_type, endpoint, catalog))
              service = Service(
                          type=service_type, url=endpoint, title=title, abstract=abstract,
                          csw_type='service', catalog=catalog
                          )
              service.save()
              return service
          else:
              LOGGER.warning('This endpoint is invalid, status code is %s' % request.status_code)
      else:
          LOGGER.warning('A service for this endpoint %s in catalog %s already exists' % (endpoint, catalog))
          return None
docs: Create a service from an endpoint if it does not already exists.