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Yeah what I meant was the only solution I could come up with so that the
driver gets passed every call is to have the every entity have a
provider.  I do believe this is a bit cumbersome for a user, and extra
validation would be needed to verify that two entities linked together
cannot have different providers, but that would be pretty easy.  In my
opinion, it'd be a bit weird to have them all have a provider.  However,
there are some pros to it such as:

1) Driver always gets the create, update, and delete calls.
2) If drivers support a varying range of values for certain entity
attributes, that validation can be caught immediately if thats something
people wanted.
3) Will remove the necessity of a DEFERRED status for some drivers
(This also brings up a CON, in that some drivers may use DEFERRED and
some may not, which leads to an inconsistent UX).
4) Status management in some drivers will become a bit easier.

Still I don't think it is something that should be done because having
the user give a provider for every entity is a bit cumbersome.  Though
if enough people want this then a larger discussion about it should
probably happen.

Thanks,
Brandon

On Mon, 2014-08-11 at 13:57 +0000, Samuel Bercovici wrote:
> Hi,
> 
>  
> 
> Validations such as “timeout > delay” should be performed on the API
> level before it reaches the driver.
> 
>  
> 
> For a configuration tree (lb, listeners, pools, etc.), there should be
> one provider. 
> 
> Having provider defined in multiple places does not make sense.
> 
>  
> 
>  
> 
> -San.
> 
>  
> 
>  
> 
> From: Vijay Venkatachalam [mailto:Vijay.Venkatachalam at citrix.com] 
> Sent: Monday, August 11, 2014 2:43 PM
> To: OpenStack Development Mailing List
> (openstack-dev at lists.openstack.org)
> Subject: [openstack-dev] [Neutron][LBaaS] Continuing on "Calling
> driver interface on every API request"
> 
> 
>  
> 
> Hi:
> 
>  
> 
> Continuing from last week’s LBaaS meeting…
> 
>  
> 
> Currently an entity cannot be sent to driver unless it is linked to
> loadbalancer because loadbalancer is the root object and driver
> information is only available with loadbalancer. 
> 
>  
> 
> The request to the driver is delayed because of which error
> propagation becomes tricky.
> 
>  
> 
> Let’s say a monitor was configured with timeout > delay there would be
> no error then.
> 
> When a listener is configured there will be a monitor
> creation/deployment error like “timeout configured greater than
> delay”.
> 
>  
> 
> Unless the error is very clearly crafted the user won’t be able to
> understand the error.
> 
>  
> 
> I am half-heartedly OK with current approach. 
> 
>  
> 
> But, I would prefer Brandon’s Solution – make provider an attribute in
> each of the entities to get rid of this problem. 
> 
>  
> 
> What do others think?
> 
>  
> 
> Thanks,
> 
> Vijay V.
> 
> 
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