On Wed, 7 Aug 2013 14:13:04 -0300
Tonhão - Antonio Brasolin <[email protected]> wrote:
> Sorry to bother you again, i still can't quite get it to work.
>
> I tried to use the method defined there, but the stats always returns empty.
>
> How i tried:
> .
> .
> .
> def getPeriodicStats(dp):
> """show periodic stats on screen
>
> :param dp: the datapath from which the stats shall be shown
> """
> waiters = {}
> while True:
> stats = get_flow_stats(dp, waiters)
> print stats
The above doesn't work since get_flow_stats works asynchronously. IOW,
it just sends a request. The response will be delivered later. You
need to a handler fo catch the response:
https://github.com/osrg/ryu/blob/master/ryu/app/ofctl_rest.py#L243
> time.sleep(1)
> .
> .
> .
>
> def dp_handler(self, ev):
> .
> .
> .
> if ev.enter:
> self.topo.add_node(ev.dp.id)
> thread.start_new(getPeriodicStats, (ev.dp,))
>
>
> Am i doing something wrong? Also, i'm not sure what is the use for the
> waiter dictionary.
As I wrote, get_flow_stats works asynchronosuly so when a request is
sent, its xid is sored in the 'waiter' dictionary. Then the response
is delivered, you can find the corresponding request.
>
> On Tue, Aug 6, 2013 at 10:44 PM, FUJITA Tomonori <
> [email protected]> wrote:
>
>> On Tue, 6 Aug 2013 13:31:20 -0300
>> Tonhão - Antonio Brasolin <[email protected]> wrote:
>>
>> > The purpose of this code is to use a lot of resources from ryu without
>> > doing anything specific, to serve as a reference/example for many things.
>> > We wanted to make a statistic request/reply but are not sure how, can you
>> > help us on that matter?
>>
>> The following code would help?
>>
>> https://github.com/osrg/ryu/blob/master/ryu/lib/ofctl_v1_0.py
>>
>> > After finishing this, we are going to make a tutorial that teaches how to
>> > use the many resources and serve as a reference to what events, contexts
>> > and messages there are and what classes represent each.
>> >
>> > Possible advanced topics in the course may include QoS and security, for
>> > which we may create sample applications.
>>
>
>
>
> --
> El Psy Congroo,
> Antonio Añon Brasolin,
> Masters Degree Student in Universidade Federal de São Carlos
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