On Apr 23, 2014, at 1:54 PM, Alison Chan <chan7...@kettering.edu> wrote:
> I am trying to access the port_no field of an ofp_port_stats reply
> object. printing the object suggests that it is an ofp_port_stats
> object, but trying to access its port_no field results in an
> AttributeError: 'list' object has no attribute 'port_no'. How do I
> access its port_no and other fields?
Well there's your problem. ;) It's a list, not an ofp_port_stats.
> [16:24:42] erinacity:~/Code/pox
> alisonc $ ./pox.py openflow.of_01 py
> [snip startup crap]
> POX> import pox.openflow.libopenflow_01 as of
> POX>
> POX> def handle_port_stats(event):
> ... print event.stats
> ... print event.stats.port_no
> ...
> POX> core.openflow.addListenerByName("PortStatsReceived", handle_port_stats)
> (<class 'pox.openflow.PortStatsReceived'>, 14)
> POX>
> core.openflow.connections[1].send(of.ofp_stats_request(body=of.ofp_port_stats_request(port_no=of.OFPP_NONE)))
> POX> [<pox.openflow.libopenflow_01.ofp_port_stats object at
> 0x2a57ad0>, <pox.openflow.libopenflow_01.ofp_port_stats object at
> 0x2a57a10>, <pox.openflow.libopenflow_01.ofp_port_stats object at
> 0x2a57b50>]
And there's your list. Of ofp_port_stats.
Try...
print [p.port_no for p in event.stats]
Or just print event.stats[0].port_no to print only the first one.
> ERROR:core:Exception while handling OpenFlowNexus!PortStatsReceived...
> Traceback (most recent call last):
> File "/home/alisonc/Code/pox/pox/lib/revent/revent.py", line 231, in
> raiseEventNoErrors
> return self.raiseEvent(event, *args, **kw)
> File "/home/alisonc/Code/pox/pox/lib/revent/revent.py", line 278, in
> raiseEvent
> rv = event._invoke(handler, *args, **kw)
> File "/home/alisonc/Code/pox/pox/lib/revent/revent.py", line 156, in _invoke
> return handler(self, *args, **kw)
> File "<console>", line 3, in handle_port_stats
> AttributeError: 'list' object has no attribute 'port_no'
>
> Cheers,
> --
> Alison Chan
> chan7...@kettering.edu
> SMS: +1 909 278 7753
> Fax: +1 206 203 2793
-- Murphy
