[keystone] how to write a plugin?

Sergey Vilgelm sergey at vilgelm.info
Mon Apr 1 23:43:02 UTC 2019

Hi Colleen,

Thank you so much. Seems I need to rewrite resource driver, but I didn’t find where the Keystone uses the `[resource] driver` option[0]. The Resource Manger just creates an instance of resource_sql.Resource[1].
I changed the `[resource] driver` option to `sql1` in the `/etc/keystone/keystone.conf` file and everything works fine :)

[0] https://github.com/openstack/keystone/blob/master/keystone/conf/resource.py#L19
[1] https://github.com/openstack/keystone/blob/master/keystone/resource/core.py#L63

Sergey Vilgelm

On Apr 1, 2019, 6:00 PM -0500, Colleen Murphy <colleen at gazlene.net>, wrote:
> Hi Sergey,
> On Mon, Apr 1, 2019, at 1:10 PM, Sergey Vilgelm wrote:
> > Hello community,
> >
> > Please help me to figure out how to write a plugin for keystone to
> > modify the current functionality. I planned to create a middleware, but
> > found that the paste was removed in Rocky and now Keystone uses the
> > hard-coded list of middleware/apps.
> >
> > I need to call an additional script/api when creating a domain or a
> > project. Is it possible to implement this without patching Keystone?
> >
> > --
> > Sergey Vilgelm
> > https://www.vilgelm.info
> >
> We have instructions for developing a plugin here:
> https://docs.openstack.org/keystone/latest/contributor/developing-drivers.html
> The short description is to subclass one of the base drivers (e.g. keystone.resource.backends.base.ResourceDriverBase) and to create a setuptools entrypoint for it, which you can then use to configure the driver option in keystone.conf.
> The driver interface is subject to change from release to release so be sure to read the release notes and update your driver implementation.
> Colleen
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