f0b8204072
As discussed at our nova meetings, reorganize the juno specs into three directories: - proposed: things proposed which weren't approved - approved: things we approved but didn't implement - implemented: things approved and implemented The first I suspect is the most controversial. I've done this because I worry about the case where a future developer wants to pick up something dropped by a previous developer, but has trouble finding previous proposed specifications on the topic. Note that the actual proposed specs for Juno are adding in a later commit. Change-Id: Idcf55ca37a83d7098dcb7c2971240c4e8fd23dc8
3.0 KiB
Standardize Nova Image
https://blueprints.launchpad.net/nova/+spec/standardize-nova-image
Standardize Nova's nova.image module to work like nova.network.api and nova.volume.cinder.
Problem description
For some reason, nova.image does things differently than nova.volume and nova.network. Instead of nova.compute.manager instantiating a self.image_api object, like it does for self.network_api and self.volume_api, the compute manager calls an obtuse collection of nova.image.glance module calls.
This blueprint is around the work to make a new nova.image.api module and have it called like other submodule "internal APIs" in Nova.
Proposed change
A new nova.image.api module shall be created, following in the style of nova.network.api and nova.volume.cinder. There will be an API class in the nova.image.api module that follows identical conventions as the nova.volume.cinder.API class, with methods for listing (get_all), showing (get), creating (create), updating (update), and removing (delete) images from the backend image store. There will be a nova.image.driver module with a base driver class.
The nova.image.glance module will be updated to subclass the base driver class.
Alternatives
There is a series of patches in review up for Nova that tries to add support for Glance's V2 API operations:
Unfortunately, I believe this patch series further muddies the image service inside Nova instead of making it cleaner and standardized with the rest of Nova's external API interfaces.
The idea of this blueprint is to lay a good foundation for future V2 Glance API work by first standardizing the image API inside of Nova.
Data model impact
None
REST API impact
None
Security impact
None
Notifications impact
None
Other end user impact
None
Performance Impact
None
Other deployer impact
None
Developer impact
See above link to Eddie Sheffield's patch series that would be affected by the code in this blueprint. Hopefully, however, once the image API is brought in line with the other internal-to-external Nova APIs, the work on V2 Glance API should be quite a bit easier.
Implementation
Assignee(s)
- Primary assignee:
-
jaypipes
Work Items
- Create the nova.image.api module that instantiates a driver
- Create the base image driver class, modeling after the new nova.network.driver class created by the refactor-network-api blueprint code.
- Move the existing glance code into a subclassed driver
Dependencies
None
Testing
None
Documentation Impact
None
References
None