The reason why I need to look at the code is that I want to know how does
NOX handle the Datapath_join_event.
I know the gen_datapath_join_callback was invoked by function
register_for_datapath_join in core.py.
I am very interested in the architecture of NOX. I am eager to know how the
NOX works. Any information will be appreciated.
Thanks for advance.
hzy
2011/11/2 hzy <yyjianx...@gmail.com>
> Hi all:
> when I look at the code in nox/src/nox/lib/util.py written in python. I
> was confused about some codes there. Because I am newbie to python.
>
> def gen_datapath_join_callback(handler):
>> def f(event):
>> attrs = {}
>> attrs[core.N_BUFFERS] = event.n_buffers
>> attrs[core.N_TABLES] = event.n_tables
>> attrs[core.CAPABILITES] = event.capabilities
>> attrs[core.ACTIONS] = event.actions
>> attrs[core.PORTS] = event.ports
>> for i in range(0, len(attrs[core.PORTS])):
>> port = attrs[core.PORTS][i]
>> config = port['config']
>> state = port['state']
>> attrs[core.PORTS][i]['link'] = (state &
>> openflow.OFPPS_LINK_DOWN) == 0
>> attrs[core.PORTS][i]['enabled'] = (config &
>> openflow.OFPPC_PORT_DOWN) == 0
>> attrs[core.PORTS][i]['flood'] = (config &
>> openflow.OFPPC_NO_FLOOD) == 0
>>
>> ret = f.cb(event.datapath_id, attrs)
>> if ret == None:
>> return CONTINUE
>> return ret
>> f.cb = handler
>> return f
>>
>
> Python can define a function in a function really confused me. I do not
> know how the function f(event) is invoked. and what the f.cb mean.
> Any ideas?
> Thanks forward.
> hzy
>
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