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check Snapshot class , that is the one passed as snapshot_ref
https://github.com/openstack/cinder/blob/stable/grizzly/cinder/db/sqlalchemy/models.py




On Wed, Oct 16, 2013 at 11:02 AM, Swapnil Kulkarni <
swapnilkulkarni2608 at gmail.com> wrote:

> Correcting the typo, snapshot_ref['volume_name'] in your case.
>
>
> On Wed, Oct 16, 2013 at 10:59 AM, Swapnil Kulkarni <
> swapnilkulkarni2608 at gmail.com> wrote:
>
>> I think snapshot[volume_name] is what you are looking for, pls see below
>> link for ref.
>>
>>
>> https://github.com/openstack/cinder/blob/stable/grizzly/cinder/volume/drivers/lvm.py#L233
>>
>> Best Regards,
>> Swapnil
>>
>> On Wed, Oct 16, 2013 at 10:57 AM, Dinakar Gorti Maruti <
>> dinakar.gm at cloudbyte.co> wrote:
>>
>>> display_name parameter  of volume
>>>
>>>
>>> On Wed, Oct 16, 2013 at 10:55 AM, Swapnil Kulkarni <
>>> swapnilkulkarni2608 at gmail.com> wrote:
>>>
>>>> What exact parameters are you looking for?
>>>>
>>>>
>>>>
>>>> On Wed, Oct 16, 2013 at 10:48 AM, Dinakar Gorti Maruti <
>>>> dinakar.gm at cloudbyte.co> wrote:
>>>>
>>>>> Hi Swapnil,
>>>>>
>>>>>                 I had tried it before , it is returning a string
>>>>> "volume" followed by volume id
>>>>>
>>>>> Thanks
>>>>> Dinakar
>>>>>
>>>>>
>>>>> On Wed, Oct 16, 2013 at 10:31 AM, Swapnil Kulkarni <
>>>>> swapnilkulkarni2608 at gmail.com> wrote:
>>>>>
>>>>>> Hi DInakar,
>>>>>>
>>>>>> Please use volume_name, volume_size,etc. These are volume related
>>>>>> parameters frequently used in snapshots. You can always do *dir* to
>>>>>> get any specific values you need.
>>>>>>
>>>>>> Best Regards,
>>>>>> Swapnil
>>>>>>
>>>>>>
>>>>>> On Wed, Oct 16, 2013 at 10:11 AM, Dinakar Gorti Maruti <
>>>>>> dinakar.gm at cloudbyte.co> wrote:
>>>>>>
>>>>>>> hi,
>>>>>>>    I am implementing a driver for cinder services and I am stuck
>>>>>>> with a problem in creation of snapshot , I have a need to fetch the volume
>>>>>>> details in snapshot creation.
>>>>>>> I am using Openstack-Grizzly
>>>>>>>
>>>>>>> I am trying to use this line of code
>>>>>>>
>>>>>>> def create_snapshot(self, snapshot_ref):
>>>>>>>       ..........
>>>>>>>
>>>>>>>       volume = snapshot_ref['volume']
>>>>>>>
>>>>>>>       ...........
>>>>>>>
>>>>>>>
>>>>>>> Error :
>>>>>>>
>>>>>>> Traceback (most recent call last):
>>>>>>>   File
>>>>>>> "/usr/lib/python2.6/site-packages/cinder/openstack/common/rpc/amqp.py",
>>>>>>> line 430, in _process_data
>>>>>>>     rval = self.proxy.dispatch(ctxt, version, method, **args)
>>>>>>>   File
>>>>>>> "/usr/lib/python2.6/site-packages/cinder/openstack/common/rpc/dispatcher.py",
>>>>>>> line 133, in dispatch
>>>>>>>     return getattr(proxyobj, method)(ctxt, **kwargs)
>>>>>>>   File "/usr/lib/python2.6/site-packages/cinder/volume/manager.py",
>>>>>>> line 564, in create_snapshot
>>>>>>>     {'status': 'error'})
>>>>>>>   File "/usr/lib64/python2.6/contextlib.py", line 23, in __exit__
>>>>>>>     self.gen.next()
>>>>>>>   File "/usr/lib/python2.6/site-packages/cinder/volume/manager.py",
>>>>>>> line 554, in create_snapshot
>>>>>>>     model_update =
>>>>>>> self.driver.create_snapshot(snapshot_ref,volume_name)
>>>>>>>   File
>>>>>>> "/usr/lib/python2.6/site-packages/cinder/volume/drivers/cloudbyte.py", line
>>>>>>> 195, in create_snapshot
>>>>>>>     LOG.debug(_("phani volume object in snapshot :
>>>>>>> %s"),snapshot_ref['volume'])
>>>>>>>   File
>>>>>>> "/usr/lib/python2.6/site-packages/cinder/db/sqlalchemy/models.py", line 74,
>>>>>>> in __getitem__
>>>>>>>     return getattr(self, key)
>>>>>>>   File
>>>>>>> "/usr/lib64/python2.6/site-packages/SQLAlchemy-0.7.8-py2.6-linux-x86_64.egg/sqlalchemy/orm/attributes.py",
>>>>>>> line 168, in __get__
>>>>>>>     return self.impl.get(instance_state(instance),dict_)
>>>>>>>   File
>>>>>>> "/usr/lib64/python2.6/site-packages/SQLAlchemy-0.7.8-py2.6-linux-x86_64.egg/sqlalchemy/orm/attributes.py",
>>>>>>> line 453, in get
>>>>>>>     value = self.callable_(state, passive)
>>>>>>>   File
>>>>>>> "/usr/lib64/python2.6/site-packages/SQLAlchemy-0.7.8-py2.6-linux-x86_64.egg/sqlalchemy/orm/strategies.py",
>>>>>>> line 481, in _load_for_state
>>>>>>>     (mapperutil.state_str(state), self.key)
>>>>>>>
>>>>>>>
>>>>>>>  DetachedInstanceError: Parent instance <Snapshot at 0x30a0cd0> is
>>>>>>> not bound to a Session; lazy load operation of attribute 'volume' cannot
>>>>>>> proceed
>>>>>>>
>>>>>>> hoping for a solution
>>>>>>>
>>>>>>> Thanks
>>>>>>> Dinakar
>>>>>>>
>>>>>>> _______________________________________________
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>>>>>>> Post to     : openstack at lists.openstack.org
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>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>
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