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# Copyright (c) 2016 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.
"""Path utilities library for nodes in the topology."""
from topology import Topology
class NodePath(object):
"""Path utilities for nodes in the topology.
:Example:
node1--link1-->node2--link2-->node3--link3-->node2--link4-->node1
RobotFramework:
| Library | resources/libraries/python/NodePath.py
| Path test
| | [Arguments] | ${node1} | ${node2} | ${node3}
| | Append Node | ${nodes1}
| | Append Node | ${nodes2}
| | Append Nodes | ${nodes3} | ${nodes2}
| | Append Node | ${nodes1}
| | Compute Path | ${FALSE}
| | ${first_int} | ${node}= | First Interface
| | ${last_int} | ${node}= | Last Interface
| | ${first_ingress} | ${node}= | First Ingress Interface
| | ${last_egress} | ${node}= | Last Egress Interface
| | ${next} | ${node}= | Next Interface
Python:
>>> from NodePath import NodePath
>>> path = NodePath()
>>> path.append_node(node1)
>>> path.append_node(node2)
>>> path.append_nodes(node3, node2)
>>> path.append_node(node1)
>>> path.compute_path()
>>> (interface, node) = path.first_interface()
>>> (interface, node) = path.last_interface()
>>> (interface, node) = path.first_ingress_interface()
>>> (interface, node) = path.last_egress_interface()
>>> (interface, node) = path.next_interface()
"""
def __init__(self):
self._nodes = []
self._links = []
self._path = []
self._path_iter = []
def append_node(self, node):
"""Append node to the path.
:param node: Node to append to the path.
:type node: dict
"""
self._nodes.append(node)
def append_nodes(self, *nodes):
"""Append nodes to the path.
:param nodes: Nodes to append to the path.
:type nodes: dict
.. note:: Node order does matter.
"""
for node in nodes:
self.append_node(node)
def clear_path(self):
"""Clear path."""
self._nodes = []
self._links = []
self._path = []
self._path_iter = []
def compute_path(self, always_same_link=True):
"""Compute path for added nodes.
:param always_same_link: If True use always same link between two nodes
in path. If False use different link (if available) between two
nodes if one link was used before.
:type always_same_link: bool
.. note:: First add at least two nodes to the topology.
"""
nodes = self._nodes
if len(nodes) < 2:
raise RuntimeError('Not enough nodes to compute path')
for idx in range(0, len(nodes) - 1):
topo = Topology()
node1 = nodes[idx]
node2 = nodes[idx + 1]
links = topo.get_active_connecting_links(node1, node2)
if not links:
raise RuntimeError('No link between {0} and {1}'.format(
node1['host'], node2['host']))
link = None
l_set = set()
if always_same_link:
l_set = set(links).intersection(self._links)
else:
l_set = set(links).difference(self._links)
if not l_set:
raise RuntimeError(
'No free link between {0} and {1}, all links already ' +
'used'.format(node1['host'], node2['host']))
if not l_set:
link = links.pop()
else:
link = l_set.pop()
self._links.append(link)
interface1 = topo.get_interface_by_link_name(node1, link)
interface2 = topo.get_interface_by_link_name(node2, link)
self._path.append((interface1, node1))
self._path.append((interface2, node2))
self._path_iter.extend(self._path)
self._path_iter.reverse()
def next_interface(self):
"""Path interface iterator.
:return: Interface and node or None if not next interface.
:rtype: tuple (str, dict)
.. note:: Call compute_path before.
"""
if not self._path_iter:
return (None, None)
else:
return self._path_iter.pop()
def first_interface(self):
"""Return first interface on the path.
:return: Interface and node.
:rtype: tuple (str, dict)
.. note:: Call compute_path before.
"""
if not self._path:
raise RuntimeError('No path for topology')
return self._path[0]
def last_interface(self):
"""Return last interface on the path.
:return: Interface and node.
:rtype: tuple (str, dict)
.. note:: Call compute_path before.
"""
if not self._path:
raise RuntimeError('No path for topology')
return self._path[-1]
def first_ingress_interface(self):
"""Return first ingress interface on the path.
:return: Interface and node.
:rtype: tuple (str, dict)
.. note:: Call compute_path before.
"""
if not self._path:
raise RuntimeError('No path for topology')
return self._path[1]
def last_egress_interface(self):
"""Return last egress interface on the path.
:return: Interface and node.
:rtype: tuple (str, dict)
.. note:: Call compute_path before.
"""
if not self._path:
raise RuntimeError('No path for topology')
return self._path[-2]
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