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