import xmltodict

from openml._api_calls import _perform_api_call

def _check_flow_exists(name, version):

"""Retrieves the flow id of the flow uniquely identified by name+version.

Parameter

---------

name : string

Name of the flow

version : string

Version information associated with flow.

Returns

-------

flow_exist : int

Flow id or -1 if the flow doesn't exist.

Notes

-----

see https://www.openml.org/api_docs/#!/flow/get_flow_exists_name_version

"""

if not (type(name) is str and len(name) > 0):

raise ValueError('Argument \'name\' should be a non-empty string')

if not (type(version) is str and len(version) > 0):

raise ValueError('Argument \'version\' should be a non-empty string')

return_code, xml_response = _perform_api_call(

"flow/exists/%s/%s" % (name, version))

# TODO check with latest version of code if this raises an exception

if return_code != 200:

# fixme raise appropriate error

raise ValueError("api call failed: %s" % xml_response)

xml_dict = xmltodict.parse(xml_response)

flow_id = xml_dict['oml:flow_exists']['oml:id']

return return_code, xml_response, flow_id