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topo.py
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topo.py
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#!/usr/bin/env python
"""@package topo
Wireless Network topology creation.
@author Ramon Fontes ([email protected])
This package includes code to represent network topologies.
"""
from mininet.util import irange
from mininet.topo import Topo as MN_TOPO, MultiGraph
class Topo(MN_TOPO):
"Data center network representation for structured multi-trees."
def __init__(self, *args, **params):
"""Topo object.
Optional named parameters:
hinfo: default host options
sopts: default switch options
lopts: default link options
calls build()"""
self.g = MultiGraph()
self.hopts = params.pop('hopts', {})
self.sopts = params.pop('sopts', {})
self.lopts = params.pop('lopts', {})
# ports[src][dst][sport] is port on dst that connects to src
self.ports = {}
self.build(*args, **params)
def build(self, *args, **params):
"Override this method to build your topology."
pass
def addStation(self, name, **opts):
"""Convenience method: Add station to graph.
name: station name
opts: station options
returns: host name"""
if not opts and self.hopts:
opts = self.hopts
return self.addNode(name, isStation=True, **opts)
def addAccessPoint(self, name, **opts):
"""Convenience method: Add ap to graph.
name: ap name
opts: ap options
returns: ap name"""
if not opts and self.sopts:
opts = self.sopts
result = self.addNode(name, isAP=True, **opts)
return result
def addHost(self, name, **opts):
"""Convenience method: Add host to graph.
name: host name
opts: host options
returns: host name"""
if not opts and self.hopts:
opts = self.hopts
return self.addNode(name, isHost=True, **opts)
# This legacy port management mechanism is clunky and will probably
# be removed at some point.
def addPort(self, src, dst, sport=None, dport=None):
"""Generate port mapping for new edge.
src: source switch name
dst: destination switch name"""
# Initialize if necessary
ports = self.ports
ports.setdefault(src, {})
ports.setdefault(dst, {})
# New port: number of outlinks + base
if sport is None:
if 'isAP' in self.g.node[src] or 'isSwitch' in self.g.node[src]:
src_base = 1
else:
src_base = 0
if 'isAP' in self.g.node[src]:
sport = None
else:
sport = len(ports[ src ]) + src_base
if dport is None:
if 'isAP' in self.g.node[dst] or 'isSwitch' in self.g.node[dst]:
dst_base = 1
else:
dst_base = 0
if 'isAP' in self.g.node[dst]:
dport = None
else:
dport = len(ports[ dst ]) + dst_base
ports[ src ][ sport ] = (dst, dport)
ports[ dst ][ dport ] = (src, sport)
return sport, dport
def nodes( self, sort=True ):
"Return nodes in graph"
if sort:
return self.sorted( self.g.nodes() )
return self.g.nodes()
def aps( self, sort=True ):
"""Return aps.
sort: sort aps alphabetically
returns: dpids list of dpids"""
return [ n for n in self.nodes( sort ) if 'isAP' in self.g.node[ n ] ]
def stations( self, sort=True ):
"""Return stations.
sort: sort stations alphabetically
returns: list of stations"""
return [ n for n in self.nodes( sort ) if 'isStation' in self.g.node[ n ] ]
def switches( self, sort=True ):
"""Return switches.
sort: sort switches alphabetically
returns: list of switches"""
return [ n for n in self.nodes( sort ) if 'isSwitch' in self.g.node[ n ] ]
def hosts( self, sort=True ):
"""Return hosts.
sort: sort hosts alphabetically
returns: list of hosts"""
return [ n for n in self.nodes( sort ) if 'isHost' in self.g.node[ n ] ]
# Our idiom defines additional parameters in build(param...)
# pylint: disable=arguments-differ
class SingleAPTopo(Topo):
"Single ap connected to k stations."
def build(self, k=2, **_opts):
"k: number of stations"
self.k = k
ap = self.addAccessPoint('ap1')
for h in irange(1, k):
sta = self.addStation('sta%s' % h)
self.addLink(sta, ap)
class MinimalWirelessTopo(SingleAPTopo):
"Minimal wireless topology with two stations and one ap"
def build(self):
return SingleAPTopo.build(self, k=2)
class LinearWirelessTopo(Topo):
"Linear Wireless topology of k aps, with n stations per ap."
def build(self, k=2, n=1, **_opts):
"""k: number of switches
n: number of hosts per switch"""
self.k = k
self.n = n
if n == 1:
genStaName = lambda i, j: 'sta%s' % i
else:
genStaName = lambda i, j: 'sta%sap%d' % (j, i)
lastAP = None
for i in irange(1, k):
# Add accessPoint
ap = self.addAccessPoint('ap%s' % i, ssid='ssid_ap%s' % i)
# Add hosts to accessPoint
for j in irange(1, n):
sta = self.addStation(genStaName(i, j))
self.addLink(sta, ap)
# Connect accessPoint to previous
if lastAP:
self.addLink(ap, lastAP)
lastAP = ap
# pylint: enable=arguments-differ