def _discover_nodes(cls, ip=None, node_id=None):
# type: (Optional[str], Optional[str]) -> Dict[str, AlbaNode]
"""
:param ip: IP of ALBA node to retrieve
:type ip: str
:param node_id: ID of the ALBA node
:type node_id: str
:return: Dict with guid of the node mapped to the node itself
:rtype: Dict[str, AlbaNode]
"""
nodes = {}
if ip is not None:
# List the requested node
node = AlbaNodeController.model_volatile_node(
node_id, AlbaNode.NODE_TYPES.ASD, ip)
data = node.client.get_metadata()
if data['_success'] is False and data[
'_error'] == 'Invalid credentials':
raise HttpNotAcceptableException(
error='invalid_data',
error_description='Invalid credentials')
if data['node_id'] != node_id:
raise HttpNotAcceptableException(
error='invalid_data',
error_description='Unexpected node identifier. {0} vs {1}'.
format(data['node_id'], node_id))
nodes[node.guid] = node
else:
nodes.update(AlbaNodeController.discover_nodes())
return nodes
