[Openstack] Extending nova models

Rad Gruchalski radek at gruchalski.com
Wed May 21 20:18:38 UTC 2014

Hi everyone,

This is my first question here. I hope I could get an answer for the problem I'm currently facing in the development of a nova API extension. I am trying to add a couple of API endpoints that would serve as an interface to the table storing some data. I was able to create an API endpoint by placing my extension in api/openstack/compute/contrib and modifying the policy.json file. This is now working.

I then added the migration to create a table to nova/db/sqlalchemy/migrate_repo_versions/245_add_custom_table.

After unstack.sh and stack.sh (I'm using devstack) I can see my table being created. Great.

Next, I proceeded with creating an object definition and created a file in nova/objects. I am basing myself on keypairs.py example (https://github.com/openstack/nova/blob/2efd3faa3e07fdf16c2d91c16462e7e1e3f33e17/nova/api/openstack/compute/contrib/keypairs.py#L97)


calls this https://github.com/openstack/nova/blob/839fe777e256d36e69e9fd7c571aed2c860b122c/nova/compute/api.py#L3512
the important part is

    keypair = keypair_obj.KeyPair()
    keypair.user_id = user_id
    keypair.name = key_name
    keypair.fingerprint = fingerprint
    keypair.public_key = public_key

`KeyPair()` is https://github.com/openstack/nova/blob/master/nova/objects/keypair.py

this has a method https://github.com/openstack/nova/blob/master/nova/objects/keypair.py#L52
and it's calling `db_keypair = db.key_pair_create(context, updates)`
`db` points to `from nova import db`

which I believe points to this https://github.com/openstack/nova/blob/master/nova/db/__init__.py
which loads https://github.com/openstack/nova/blob/master/nova/db/api.py
there's a function called https://github.com/openstack/nova/blob/master/nova/db/api.py#L922
`key_pair_create` https://github.com/openstack/nova/blob/master/nova/db/api.py#L924

`IMPL` is https://github.com/openstack/nova/blob/master/nova/db/api.py#L69-L95
but where is `IMPL.key_pair_create`?

Is there an easy way to insert a record into the table?
Thank you for any pointers.

I’ve posted the same question on ask.openstack.org (https://ask.openstack.org/en/questions/30231) and I also asked this question on openstack-dev (which I know by now is wrong).

Kind regards,

Radek Gruchalski

radek at gruchalski.com (mailto:radek at gruchalski.com)
 (mailto:radek at gruchalski.com)
de.linkedin.com/in/radgruchalski/ (http://de.linkedin.com/in/radgruchalski/)

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