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#!/usr/bin/env python
'''@package topo
Network topology creation.
@author Brandon Heller (brandonh@stanford.edu)
This package includes code to represent network topologies.
A Topo object can be a topology database for NOX, can represent a physical
setup for testing, and can even be emulated with the Mininet package.
'''
# BL: we may have to fix compatibility here.
# networkx is also a fairly heavyweight dependency
# from networkx.classes.graph import Graph
from networkx import Graph
from mininet.util import irange, natural, naturalSeq
class Topo(object):
"Data center network representation for structured multi-trees."
def __init__(self, hopts=None, sopts=None, lopts=None):
"""Topo object:
hinfo: default host options
sopts: default switch options
lopts: default link options"""
self.g = Graph()
self.node_info = {}
self.link_info = {} # (src, dst) tuples hash to EdgeInfo objects
self.hopts = {} if hopts is None else hopts
self.sopts = {} if sopts is None else sopts
self.lopts = {} if lopts is None else lopts
self.ports = {} # ports[src][dst] is port on src that connects to dst
def add_node(self, name, **opts):
"""Add Node to graph.
name: name
opts: node options
returns: node name"""
self.g.add_node(name)
self.node_info[name] = opts
return name
def add_host(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.add_node(name, **opts)
def add_switch(self, name, **opts):
"""Convenience method: Add switch to graph.
name: switch name
opts: switch options
returns: switch name"""
if not opts and self.sopts:
opts = self.sopts
result = self.add_node(name, is_switch=True, **opts)
return result
def add_link(self, node1, node2, port1=None, port2=None,
**opts):
"""node1, node2: nodes to link together
port1, port2: ports (optional)
opts: link options (optional)
returns: link info key"""
if not opts and self.lopts:
opts = self.lopts
self.add_port(node1, node2, port1, port2)
key = tuple(self.sorted([node1, node2]))
self.link_info[key] = opts
self.g.add_edge(*key)
return key
def add_port(self, src, dst, sport=None, dport=None):
'''Generate port mapping for new edge.
@param src source switch name
@param dst destination switch name
'''
self.ports.setdefault(src, {})
self.ports.setdefault(dst, {})
# New port: number of outlinks + base
src_base = 1 if self.is_switch(src) else 0
dst_base = 1 if self.is_switch(dst) else 0
if sport is None:
sport = len(self.ports[src]) + src_base
if dport is None:
dport = len(self.ports[dst]) + dst_base
self.ports[src][dst] = sport
self.ports[dst][src] = dport
def nodes(self, sort=True):
"Return nodes in graph"
if sort:
return self.sorted( self.g.nodes() )
else:
return self.g.nodes()
def is_switch(self, n):
'''Returns true if node is a switch.'''
info = self.node_info[n]
return info and info.get('is_switch', False)
def switches(self, sort=True):
'''Return switches.
sort: sort switches alphabetically
@return dpids list of dpids
'''
return [n for n in self.nodes(sort) if self.is_switch(n)]
def hosts(self, sort=True):
'''Return hosts.
sort: sort hosts alphabetically
@return dpids list of dpids
'''
return [n for n in self.nodes(sort) if not self.is_switch(n)]
def links(self, sort=True):
'''Return links.
sort: sort links alphabetically
@return links list of name pairs
'''
if not sort:
return self.g.edges()
else:
links = [tuple(self.sorted(e)) for e in self.g.edges()]
return sorted( links, key=naturalSeq )
def port(self, src, dst):
'''Get port number.
@param src source switch name
@param dst destination switch name
@return tuple (src_port, dst_port):
src_port: port on source switch leading to the destination switch
dst_port: port on destination switch leading to the source switch
'''
if src in self.ports and dst in self.ports[src]:
assert dst in self.ports and src in self.ports[dst]
return (self.ports[src][dst], self.ports[dst][src])
def linkInfo( self, src, dst ):
"Return link metadata"
src, dst = self.sorted([src, dst])
return self.link_info[(src, dst)]
def nodeInfo( self, name ):
"Return metadata (dict) for node"
info = self.node_info[ name ]
return info if info is not None else {}
def setNodeInfo( self, name, info ):
"Set metadata (dict) for node"
self.node_info[ name ] = info
@staticmethod
def sorted( items ):
"Items sorted in natural (i.e. alphabetical) order"
return sorted(items, key=natural)
class SingleSwitchTopo(Topo):
'''Single switch connected to k hosts.'''
def __init__(self, k=2, **opts):
'''Init.
@param k number of hosts
@param enable_all enables all nodes and switches?
'''
super(SingleSwitchTopo, self).__init__(**opts)
self.k = k
switch = self.add_switch('s1')
for h in irange(1, k):
host = self.add_host('h%s' % h)
self.add_link(host, switch)
class SingleSwitchReversedTopo(Topo):
'''Single switch connected to k hosts, with reversed ports.
The lowest-numbered host is connected to the highest-numbered port.
Useful to verify that Mininet properly handles custom port numberings.
'''
def __init__(self, k=2, **opts):
'''Init.
@param k number of hosts
@param enable_all enables all nodes and switches?
'''
super(SingleSwitchReversedTopo, self).__init__(**opts)
self.k = k
switch = self.add_switch('s1')
for h in irange(1, k):
host = self.add_host('h%s' % h)
self.add_link(host, switch,
port1=0, port2=(k - h + 1))
class LinearTopo(Topo):
"Linear topology of k switches, with one host per switch."
def __init__(self, k=2, **opts):
"""Init.
k: number of switches (and hosts)
hconf: host configuration options
lconf: link configuration options"""
super(LinearTopo, self).__init__(**opts)
self.k = k
lastSwitch = None
for i in irange(1, k):
host = self.add_host('h%s' % i)
switch = self.add_switch('s%s' % i)
self.add_link( host, switch)
if lastSwitch:
self.add_link( switch, lastSwitch)
lastSwitch = switch