Hi, I would use 1st option.
Consider plugins which is mutually exclusive, and you need to disable
default tasks if plugin is selected.

As example:
- neutron backend plugins

    - ovs
    - contrail
  value: ovs

Right now we are using ovs as neutron_backend, but what we will need to do
if plugin will provide completely different backend, as contrail?

In 1st case - in tasks we will introduce simple conditions (in description
or in python code of the plugin):
condition: 'ovs == cluster.attributes.neutron_backend' - for default

condition: 'contrail == cluster.attributes.neutron_backend' - contrail
plugin workflow

And if we need to exclude some task from workflow - simply select another
value from drop down list.
I believe same applies for glance/cinder backends (lvm/ceph, swift/ceph).
Atleast we are managing them this way right now.

Also, we should not forget about CLI.
I can easily imagine how operator downloads cluster config (big cluster
attributes file) and modifies it accordingly to turn on specific plugins.
How we will manage plugins from cli if plugins will be managed from wizard?

On Tue, Oct 7, 2014 at 5:17 PM, Evgeniy L <e...@mirantis.com> wrote:

> Hi,
> We had a meeting today about plugins on UI, as result of the meeting
> we have two approaches and this approaches affect not only UX but
> plugins itself.
> *1st - disable/enable plugin on settings tab*
>    1. user installs the plugin
>    2. creates a cluster
>    3. configures and enables/disables plugins on settings tab
> For user it will look like Ceph plugin checkboxes on settings tab,
> if he enables checkbox, then we pass the parameter to orchestrator
> as `true`.
> Cons:
>    - plugin developer should define a checkbox in each plugin (for plugin
>    disabling/enabling)
>    - on the backend we have to enable all of the plugins for environment,
>    because user can define any name for his checkbox and we won't be able to
>    find it and make appropriate mapping plugin <-> env
>    - since all of the plugins are always "enabled" we have to run tasks
>    for all of the plugins, and each plugin should parse astute.yaml in order
>    to figure out if it's required to run task current script
> Pros:
>    - it won't require additional setting or step for wizard
>    - user will be able to disable plugin after environment creation
> *2nd - enable plugins in wizard*
>    1. user installs the plugin
>    2. now he can choose specific plugins for his environment in wizard
>    3. after cluster is created, he can configure additional parameters on
>    settings tab, if plugin provides any
> Cons:
>    - user won't be able to disable plugin after cluster is created
>    - additional step or configuration subcategory in wizard
> Pros:
> On backend we always know which plugin is disabled and which is enabled.
>    - it means we don't provide settings for plugins which are disabled
>    - we don't run tasks on slaves if it's not required
> Thanks,
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