def _convert_endpoint(endpoint):
    """Converts py_zipkin's Endpoint to Protobuf's Endpoint.

    :param endpoint: py_zipkins' endpoint to convert.
    :type endpoint: py_zipkin.encoding.Endpoint
    :return: corresponding protobuf's endpoint.
    :rtype: zipkin_pb2.Endpoint
    """
    pb_endpoint = zipkin_pb2.Endpoint()

    if endpoint.service_name:
        pb_endpoint.service_name = endpoint.service_name
    if endpoint.port and endpoint.port != 0:
        pb_endpoint.port = endpoint.port
    if endpoint.ipv4:
        pb_endpoint.ipv4 = socket.inet_pton(socket.AF_INET, endpoint.ipv4)
    if endpoint.ipv6:
        pb_endpoint.ipv6 = socket.inet_pton(socket.AF_INET6, endpoint.ipv6)

    return pb_endpoint
Converts py_zipkin's Endpoint to Protobuf's Endpoint.

    :param endpoint: py_zipkins' endpoint to convert.
    :type endpoint: py_zipkin.encoding.Endpoint
    :return: corresponding protobuf's endpoint.
    :rtype: zipkin_pb2.Endpoint