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No, I mean that if drivers are going to access database, then they should
do it via a defined interface that limits what they can do to a sane set of
operations. I'd still prefer that they didn't need extra access beyond the
model update, but I don't know if that is possible.

Duncan Thomas
On Dec 19, 2014 6:43 PM, "Amit Das" <amit.das at cloudbyte.com> wrote:

> Thanks Duncan.
> Do you mean hepler methods in the specific driver class?
> On 19 Dec 2014 14:51, "Duncan Thomas" <duncan.thomas at gmail.com> wrote:
>
>> So our general advice has historical been 'drivers should not be
>> accessing the db directly'. I haven't had chance to look at your driver
>> code yet, I've been on vacation, but my suggestion is that if you
>> absolutely must store something in the admin metadata rather than somewhere
>> that is covered by the model update (generally provider location and
>> provider auth) then writing some helper methods that wrap the context bump
>> and db call would be better than accessing it directly from the driver.
>>
>> Duncan Thomas
>> On Dec 18, 2014 11:41 PM, "Amit Das" <amit.das at cloudbyte.com> wrote:
>>
>>> Hi Stackers,
>>>
>>> I have been developing a Cinder driver for CloudByte storage and have
>>> come across some scenarios where the driver needs to do create, read &
>>> update operations on cinder database (volume_admin_metadata table). This is
>>> required to establish a mapping between OpenStack IDs with the backend
>>> storage IDs.
>>>
>>> Now, I have got some review comments w.r.t the usage of DB related
>>> operations esp. w.r.t raising the context to admin.
>>>
>>> In short, it has been advised not to use "*context.get_admin_context()*
>>> ".
>>>
>>>
>>> https://review.openstack.org/#/c/102511/15/cinder/volume/drivers/cloudbyte/cloudbyte.py
>>>
>>> However, i get errors trying to use the default context as shown below:
>>>
>>> *2014-12-19 12:18:17.880 TRACE oslo.messaging.rpc.dispatcher   File
>>> "/opt/stack/cinder/cinder/db/sqlalchemy/api.py", line 103, in
>>> is_admin_context*
>>> *2014-12-19 12:18:17.880 TRACE oslo.messaging.rpc.dispatcher     return
>>> context.is_admin*
>>> *2014-12-19 12:18:17.880 TRACE oslo.messaging.rpc.dispatcher
>>> AttributeError: 'module' object has no attribute 'is_admin'*
>>>
>>> So what is the proper way to run these DB operations from within a
>>> driver ?
>>>
>>>
>>> Regards,
>>> Amit
>>> *CloudByte Inc.* <http://www.cloudbyte.com/>
>>>
>>> _______________________________________________
>>> OpenStack-dev mailing list
>>> OpenStack-dev at lists.openstack.org
>>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
>>>
>>>
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