Unable to add nodes to slice

[Vaiden Logan]

Hello, I am trying to add two nodes to my slice using the code below. However, I get an error: NetworkXError: GraphML writer does not support <class ‘list’> as data values. Could I get some help in understanding how to fix this? I’ve included the full error below the code.

 

 

slice_modified = fablib.get_slice(name=slice_name)
avoid_sites = [‘STAR’]
site_5 = fablib.get_random_sites(count=1,filter_function=lambda x:x[‘ptp_capable’] is True, avoid=(avoid_sites))
node5 = slice_modified.add_node(name=node5_name, site=site_5, cores=16, ram=32, disk=75, image=’default_ubuntu_22′)
node5_nic = node5.add_component(model=’NIC_Basic’, name=node5_nic_name).get_interfaces()[0]
node5_net = slice_modified.add_l3network(name=network5_name, interfaces=[node5_nic], type=’IPv4′)

site_6 = fablib.get_random_sites(count=1,filter_function=lambda x:x[‘ptp_capable’] is True, avoid=(avoid_sites))
node6 = slice_modified.add_node(name=node6_name, site=site_6, cores=16, ram=32, disk=75, image=’default_ubuntu_22′)
node6_nic = node6.add_component(model=’NIC_Basic’, name=node6_nic_name).get_interfaces()[0]
node6_net = slice_modified.add_l3network(name=network6_name, interfaces=[node6_nic], type=’IPv4′)

slice_modified.submit()

NetworkXError                             Traceback (most recent call last)
Cell In[16], line 13
     10 node6_nic = node6.add_component(model='NIC_Basic', name=node6_nic_name).get_interfaces()[0]
     11 node6_net = slice_modified.add_l3network(name=network6_name, interfaces=[node6_nic], type='IPv4')
---> 13 slice_modified.submit()

File /opt/conda/lib/python3.10/site-packages/fabrictestbed_extensions/fablib/slice.py:1961, in Slice.submit(self, wait, wait_timeout, wait_interval, progress, wait_jupyter, post_boot_config, wait_ssh, extra_ssh_keys)
   1958     progress = False
   1960 # Generate Slice Graph
-> 1961 slice_graph = self.get_fim_topology().serialize()
   1963 # Request slice from Orchestrator
   1964 if self._is_modify():

File /opt/conda/lib/python3.10/site-packages/fim/user/topology.py:466, in Topology.serialize(self, file_name, fmt)
    458 def serialize(self, file_name: str = None, fmt: GraphFormat = GraphFormat.GRAPHML) -> str or None:
    459     """
    460     Serialize to string or to file, depending on whether file_name
    461     is provided.
   (...)
    464     :return string containing GraphML if file_name is None:
    465     """
--> 466     graph_string = self.graph_model.serialize_graph(format=fmt)
    467     if file_name is None:
    468         return graph_string

File /opt/conda/lib/python3.10/site-packages/fim/graph/networkx_property_graph.py:375, in NetworkXPropertyGraph.serialize_graph(self, format)
    373 if graph is not None:
    374     if format == GraphFormat.GRAPHML:
--> 375         graph_string = '\n'.join(nx.generate_graphml(graph))
    376         graph_string = GraphML.networkx_to_neo4j(graph_string)
    377     elif format == GraphFormat.JSON_NODELINK:

File /opt/conda/lib/python3.10/site-packages/networkx/readwrite/graphml.py:231, in generate_graphml(G, encoding, prettyprint, named_key_ids, edge_id_from_attribute)
    195 """Generate GraphML lines for G
    196 
    197 Parameters
   (...)
    223 edges together) hyperedges, nested graphs, or ports.
    224 """
    225 writer = GraphMLWriter(
    226     encoding=encoding,
    227     prettyprint=prettyprint,
    228     named_key_ids=named_key_ids,
    229     edge_id_from_attribute=edge_id_from_attribute,
    230 )
--> 231 writer.add_graph_element(G)
    232 yield from str(writer).splitlines()

File /opt/conda/lib/python3.10/site-packages/networkx/readwrite/graphml.py:650, in GraphMLWriter.add_graph_element(self, G)
    647 for xml_obj, data in self.attributes.items():
    648     for k, v, scope, default in data:
    649         xml_obj.append(
--> 650             self.add_data(
    651                 str(k), self.attr_type(k, scope, v), str(v), scope, default
    652             )
    653         )
    654 self.xml.append(graph_element)

File /opt/conda/lib/python3.10/site-packages/networkx/readwrite/graphml.py:562, in GraphMLWriter.add_data(self, name, element_type, value, scope, default)
    557 """
    558 Make a data element for an edge or a node. Keep a log of the
    559 type in the keys table.
    560 """
    561 if element_type not in self.xml_type:
--> 562     raise nx.NetworkXError(
    563         f"GraphML writer does not support {element_type} as data values."
    564     )
    565 keyid = self.get_key(name, self.get_xml_type(element_type), scope, default)
    566 data_element = self.myElement("data", key=keyid)

NetworkXError: GraphML writer does not support <class 'list'> as data values.

[Hussam Nasir]

Do you know what version of fablib you may be using ?

[Paul Ruth]

Vaiden,

The following line from your example returns a list of site names. This is true even if it returns only one site in the list.

site_5 = fablib.get_random_sites(count=1,filter_function=lambda x:x[‘ptp_capable’] is True, avoid=(avoid_sites))

When you pass it to add_node in the following line, you are passing a list as the site argument. That argument need to be a string.

node5 = slice_modified.add_node(name=node5_name, site=site_5, cores=16, ram=32, disk=75, image=’default_ubuntu_22′)

Paul

[Vaiden Logan]

1.6.0

[Vaiden Logan]

Thanks Paul. That fixed it!

[Author]

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