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Neutron has the ability already of sending an event as a REST call to
notify a third party that a port became active [1]
This is used by Nova to hold on booting instances until network has been
wired.
Perhaps kuryr could leverage this without having to tap into the AMQP bus,
as that would be implementation-specific - since there would be an
assumption about having a plugin that communicates with the reference impl
l2 agent.

Salvatore

[1]
http://git.openstack.org/cgit/openstack/neutron/tree/neutron/notifiers/nova.py



On 8 June 2016 at 17:23, Mohammad Banikazemi <mb at us.ibm.com> wrote:

> For the Kuryr project, in order to support blocking until vifs are plugged
> in (that is adding config options similar to the following options define
> in Nova: vif_plugging_is_fatal and vif_plugging_timeout), we need to detect
> that the Neutron plugin being used is done with plugging a given vif.
>
> Here are a few options:
>
> 1- The simplest approach seems to be polling for the status of the Neutron
> port to become Active. (This may lead to scalability issues but short of
> having a specific goal for scalability, it is not clear that will be the
> case.)
> 2- Alternatively, We could subscribe to the message queue and wait for
> such a port update event.
> 3- It was also suggested that we could use l2 agent extension to detect
> such an event but that seems to limit us to certain Neutron plugins and
> therefore not acceptable.
>
> I was wondering if there are other and better options.
>
> Best,
>
> Mohammad
>
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