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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