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# Copyright (c) 2018 Cisco and/or its affiliates.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Robot framework variable file.
Create dictionary variable nodes_ipv4_addr of IPv4 addresses from
available networks.
"""
from ipaddress import IPv4Network
from resources.libraries.python.topology import Topology
# Default list of IPv4 subnets
IPV4_NETWORKS = ['192.168.{}.0/24'.format(i) for i in range(1, 100)]
class IPv4NetworkGenerator(object):
"""IPv4 network generator.
TODO: Conform to https://docs.python.org/2/library/stdtypes.html#typeiter
"""
def __init__(self, networks):
"""Populate internal list of valid networks.
:param networks: List of strings containing IPv4 subnet
with prefix length.
:type networks: list
:raise RuntimeError: If no IPv4 networks are added.
"""
self._networks = []
for network in networks:
net = IPv4Network(unicode(network))
self._networks.append(net)
if not self._networks:
raise RuntimeError("No IPv4 networks")
def next_network(self):
"""Pop and return network from internal list.
:returns: Next network in form (IPv4Network, subnet).
:raises StopIteration: If there are no more elements.
"""
if self._networks:
return self._networks.pop()
else:
raise StopIteration()
def get_variables(nodes, networks=IPV4_NETWORKS[:]):
"""Special robot framework method that returns dictionary nodes_ipv4_addr,
mapping of node and interface name to IPv4 address.
:param nodes: Nodes of the test topology.
:param networks: List of available IPv4 networks.
:type nodes: dict
:type networks: list
.. note::
Robot framework calls it automatically.
"""
topo = Topology()
links = topo.get_links(nodes)
if len(links) > len(networks):
raise Exception('Not enough available IPv4 networks for topology.')
ip4_n = IPv4NetworkGenerator(networks)
nets = {}
for link in links:
ip4_net = ip4_n.next_network()
net_hosts = ip4_net.hosts()
port_idx = 0
ports = {}
for node in nodes.values():
if_key = topo.get_interface_by_link_name(node, link)
if_name = topo.get_interface_name(node, if_key)
if if_name is not None:
port = {'addr': str(next(net_hosts)),
'node': node['host'],
'if': if_name}
port_idx += 1
port_id = 'port{0}'.format(port_idx)
ports.update({port_id: port})
nets.update({link: {'net_addr': str(ip4_net.network_address),
'prefix': ip4_net.prefixlen,
'ports': ports}})
return {'DICT__nodes_ipv4_addr': nets}
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