[openstack-dev] [nova] Microversions support for extensions without Controller

Alex Xu soulxu at gmail.com
Tue Dec 15 13:03:30 UTC 2015

Hi, Alexandre,

we discussed this on api meeting

Finally people agreement on merge os-user-data into servers. I will submit
a patch up for this merge.


2015-12-14 21:24 GMT+08:00 Alex Xu <soulxu at gmail.com>:

> Hi, Alexandre,
> Yes, I think we need pass the version into `server_update` extension
> point. My irc nick is alex_xu, let me know if you have any trouble with
> this.
> Thanks
> Alex
> 2015-12-13 2:34 GMT+08:00 Alexandre Levine <alexandrelevine at gmail.com>:
>> Hi all,
>> os-user-data extension implements server_create method to add user_data
>> for server creation. No Controller is used for this, only "class
>> UserData(extensions.V21APIExtensionBase)".
>> I want to add server_update method allowing to update the user_data.
>> Obviously I have to add it as a microversioned functionality.
>> And here is the problem: there is no information about the incoming
>> request version in this code. It is available for Controllers only. But
>> checking the version in controller would be too late, because the instance
>> is already updated (non-generator extensions are post-processed).
>> Can anybody guide me how to resolve this collision?
>> Would it be possible to just retroactively add the user_data modification
>> for the whole 2.1 version skipping the microversioning? Or we need to
>> change nova so that request version is passed through to extension?
>> Best regards,
>>   Alex Levine
>> P.S. Sorry for the second attempt - previous letter went with [openstack]
>> instead of [openstack-dev] in the Subject.
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