1 # Copyright (c) 2016 Cisco and/or its affiliates.
2 # Licensed under the Apache License, Version 2.0 (the "License");
3 # you may not use this file except in compliance with the License.
4 # You may obtain a copy of the License at:
6 # http://www.apache.org/licenses/LICENSE-2.0
8 # Unless required by applicable law or agreed to in writing, software
9 # distributed under the License is distributed on an "AS IS" BASIS,
10 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
11 # See the License for the specific language governing permissions and
12 # limitations under the License.
14 """Robot framework variable file.
16 Create dictionary variable nodes_ipv4_addr of IPv4 addresses from
19 from ipaddress import IPv4Network
21 from resources.libraries.python.topology import Topology
23 # Default list of IPv4 subnets
24 IPV4_NETWORKS = ['192.168.{}.0/24'.format(i) for i in range(1, 100)]
27 class IPv4NetworkGenerator(object):
28 """IPv4 network generator."""
29 def __init__(self, networks):
31 :param networks: list of strings containing IPv4 subnet
34 self._networks = list()
35 for network in networks:
36 net = IPv4Network(unicode(network))
37 self._networks.append(net)
38 if len(self._networks) == 0:
39 raise Exception('No IPv4 networks')
41 def next_network(self):
43 :return: next network in form (IPv4Network, subnet)
44 :raises: StopIteration if there are no more elements.
46 if len(self._networks):
47 return self._networks.pop()
52 def get_variables(nodes, networks=IPV4_NETWORKS[:]):
53 """Special robot framework method that returns dictionary nodes_ipv4_addr,
54 mapping of node and interface name to IPv4 adddress.
56 :param nodes: Nodes of the test topology.
57 :param networks: list of available IPv4 networks
62 Robot framework calls it automatically.
65 links = topo.get_links(nodes)
67 if len(links) > len(networks):
68 raise Exception('Not enough available IPv4 networks for topology.')
70 ip4_n = IPv4NetworkGenerator(networks)
75 ip4_net = ip4_n.next_network()
76 net_hosts = ip4_net.hosts()
79 for node in nodes.values():
80 if_name = topo.get_interface_by_link_name(node, link)
81 if if_name is not None:
82 port = {'addr': str(next(net_hosts)),
86 port_id = 'port{0}'.format(port_idx)
87 ports.update({port_id: port})
88 nets.update({link: {'net_addr': str(ip4_net.network_address),
89 'prefix': ip4_net.prefixlen,
92 return {'DICT__nodes_ipv4_addr': nets}