WebUI component:

        topology_uuid = session['topology_uuid']

        json_topo_id = json_topology_id(topology_uuid, context_id=json_context_id(context_uuid))

        grpc_topology = context_client.GetTopology(TopologyId(**json_topo_id))

        response = context_client.GetTopologyDetails(TopologyId(**json_topo_id))

        topo_device_uuids = {device_id.device_uuid.uuid for device_id in grpc_topology.device_ids}

        topo_link_uuids   = {link_id  .link_uuid  .uuid for link_id   in grpc_topology.link_ids  }

        response = context_client.ListDevices(Empty())

        devices = []

        for device in response.devices:

            if device.device_id.device_uuid.uuid not in topo_device_uuids: continue

            devices.append({

                'id': device.device_id.device_uuid.uuid,

                'name': device.name,

                'type': device.device_type,

            })

        response = context_client.ListLinks(Empty())

        links = []

        for link in response.links:

            if link.link_id.link_uuid.uuid not in topo_link_uuids: continue

            if len(link.link_endpoint_ids) != 2:

                str_link = grpc_message_to_json_string(link)

                LOGGER.warning('Unexpected link with len(endpoints) != 2: {:s}'.format(str_link))