125 lines
4.4 KiB
Python
125 lines
4.4 KiB
Python
#!/usr/bin/env python3
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# -*- encoding: utf-8 -*-
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import sys
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import json
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from pathlib import Path
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from os import linesep as eol
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def render_topology(hosts, switches, links):
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indent = ' '*4
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s = ''
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s += f'#!/usr/bin/env python{eol}# -*- encoding: utf-8 -*-{eol}'+eol
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s += 'from mininet.net import Mininet'+eol
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s += 'from mininet.topo import Topo'+eol
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s += 'from mininet.node import Controller, RemoteController, OVSController'+eol
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s += 'from mininet.node import CPULimitedHost, Host, Node'+eol
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s += 'from mininet.node import OVSKernelSwitch, UserSwitch'+eol
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s += 'from mininet.node import IVSSwitch'+eol
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s += 'from mininet.cli import CLI'+eol
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s += 'from mininet.log import setLogLevel, info'+eol
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s += 'from mininet.link import TCLink, Intf'+eol
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s += 'from subprocess import call'+eol
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s += eol
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##########################################################################
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s += eol
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s += f'def _init(topo):{eol}'
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# switch
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s += f"{indent}info('*** Adding switches\\n'){eol}"
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for sw in sorted(switches, key=lambda a: int(a[1:])):
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s += f"{indent}{sw} = topo.addSwitch('{sw}', cls=OVSKernelSwitch){eol}"
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s += eol
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# hosts
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s += f"{indent}info('*** Adding hosts\\n'){eol}"
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for hs in sorted(hosts, key=lambda a: int(a[1:])):
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ipint = int(hs[1:])
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iplst = [
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ipint//(256**2),
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(ipint//256) % 256,
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ipint % 256
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]
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ip = '.'.join(list(map(str, iplst)))
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s += f"{indent}{hs} = topo.addHost('{hs}', cls=Host, ip='10.{ip}', defaultRoute=None){eol}"
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s += eol
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# links
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s += f"{indent}info('*** Adding links\\n'){eol}"
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for e1, e2, bw in links:
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s += f"{indent}topo.addLink({e1}, {e2}, cls=TCLink, bw={bw}){eol}"
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s += eol
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##########################################################################
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s += eol
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s += f'class MyTopo(Topo):{eol}'
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s += f'{indent}def __init__(self):{eol}'
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s += f'{indent}{indent}Topo.__init__(self){eol}'
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s += f'{indent}{indent}_init(self){eol}'
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s += eol
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##########################################################################
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s += eol
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s += 'def myNetwork(standalone = False):'+eol
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s += f'{indent}net = Mininet({eol}'
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s += f'{indent}{indent}topo=None,{eol}'
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s += f'{indent}{indent}build=False,{eol}'
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s += f'{indent}{indent}ipBase="10.0.0.0/8"{eol}'
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s += f'{indent}){eol}'
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s += eol
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# controller
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s += f"{indent}info('*** Adding controller\\n'){eol}"
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s += f"{indent}c0=net.addController({eol}"
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s += f"{indent}{indent}name='c0',{eol}"
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s += f"{indent}{indent}controller=RemoteController,{eol}"
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s += f"{indent}{indent}ip='127.0.0.1',{eol}"
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s += f"{indent}{indent}protocol='tcp',{eol}"
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s += f"{indent}{indent}port=6633{eol}"
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s += f"{indent}){eol}"
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s += eol
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# Topology
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s += f"{indent}_init(net){eol}"
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s += eol
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# rest
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s += f"{indent}info('*** Starting network\\n'){eol}"
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s += f"{indent}net.build(){eol}"
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s += eol
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s += f"{indent}info('*** Starting controllers\\n'){eol}"
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s += f"{indent}for controller in net.controllers:{eol}"
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s += f"{indent}{indent}controller.start(){eol}"
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s += eol
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s += f"{indent}info('*** Starting switches\\n'){eol}"
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for sw in sorted(switches, key=lambda a: int(a[1:])):
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s += f"{indent}net.get('{sw}').start([c0]){eol}"
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s += eol
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s += f"{indent}if standalone:{eol}"
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s += f"{indent}{indent}info('*** Post configure switches and hosts\\n'){eol}"
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s += f"{indent}{indent}CLI(net){eol}"
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s += f"{indent}{indent}net.stop(){eol}"
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s += eol
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s += f"{indent}return net{eol}"
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# main
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s += eol
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##########################################################################
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s += eol
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s += "topos = {'mytopo': MyTopo}"+eol
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s += eol
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##########################################################################
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s += eol
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s += f'if __name__ == "__main__":{eol}'
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s += f'{indent}setLogLevel("info"){eol}'
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s += f'{indent}myNetwork(True){eol}'
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return s
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def main(fn: str):
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topo = json.loads(Path(f'{fn}.json').read_text())
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rendered = render_topology(*topo)
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Path(f'{fn}.py').write_text(rendered)
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if __name__ == "__main__":
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if len(sys.argv) > 1:
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fn = ' '.join(sys.argv[1:])
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main(fn)
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else:
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print("Usage:", file=sys.stderr)
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print(f" {sys.argv[0]} <toponame>", file=sys.stderr)
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print(f" <toponame>.json --> <toponame>.py", file=sys.stderr)
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