def common_mgr():
"""
Create a base topology.
This uses the ExtendedNMLManager for it's helpers.
"""
# Create base topology
mgr = ExtendedNMLManager(name='Graphviz Namespace')
sw1 = mgr.create_node(identifier='sw1', name='My Switch 1')
sw2 = mgr.create_node(identifier='sw2', name='My Switch 2')
assert mgr.get_object('sw1') is not None
assert mgr.get_object('sw2') is not None
sw1p1 = mgr.create_biport(sw1)
sw1p2 = mgr.create_biport(sw1)
sw1p3 = mgr.create_biport(sw1) # noqa
sw2p1 = mgr.create_biport(sw2)
sw2p2 = mgr.create_biport(sw2)
sw2p3 = mgr.create_biport(sw2) # noqa
sw1p1_sw2p1 = mgr.create_bilink(sw1p1, sw2p1) # noqa
sw1p2_sw2p2 = mgr.create_bilink(sw1p2, sw2p2) # noqa
return mgr
def __init__(self, engine=DEFAULT_PLATFORM, **kwargs):
if engine not in platforms():
raise RuntimeError('Unknown platform engine "{}".'.format(engine))
self.nml = ExtendedNMLManager(**kwargs)
self.engine = engine
self.nodes = OrderedDict()
self.ports = OrderedDict()
self._platform = None
self._built = False
