[Kimchi-devel] Sharing of functionality between Kimchi and Ginger

[Paulo Ricardo Paz Vital]

On Fri, 2015-08-28 at 12:03 +0200, Walter Niklaus wrote:
> Hi All,
> 
> first I want to clarify that the following proposal is targeting the
> 1.6 
> release and can wait till we have stabilized the new UI in 1.6.
> But I guess that it will take some discussion to come up with a good 
> solution so I thought I'll start it now even knowing that I'll not be
> able to participate in the discussion for the next 2 weeks since I'll
> be 
> travelling.
> 
> Problem statement:
>     -  there is a set functionalities which are usefull/required in 
> kimchi and ginger, for example:
>           - logical volume management:
>                 - required by kimchi to define a storage pool based
> on LVM
>                 - required by ginger to manage the host owned logical
> volumes
>           - networking:  VLAN assignement, bridge management
>                 - required by kimchi on virtual network management
>                 - required by ginger outside/without virtualisation
> 
> Currently the functionalities mentioned above are part of the kimchi
> plugin.
> 
> Options to address this problem:
>    1. Implement the functionality in both plugins.
>            Pros:   the current code in kimchi can stay unchanged
>            Cons:  code dupplication, double maintanance
>    2.  Share the source code modules
>            Pros:   no code duplication
>            Cons:  potential module duplication since the plugins are
> in 
> different repos
>    3.  "Interfacing" between the plugins: one plugin implements the 
> functionality and is exposing an interface for other plugins
>            Pros:   clean separation
>            Cons:  dependency between plugins (but we have that anyhow
> already between kimchi and gingercommon)
>    4. ???
> 
> My preffered Option would be 3. but potentially there are othere
> options 
> and aspect I may have missed.

Interesting suggestion Walter and I prefer option 3 also.

However, Ginger is an "optional" plugin to manage the host (and here I
agree 100% with you that some Kimchi operations should be part of
Ginger) and one question comes with this approach: what will happen if
user installs only Wok with Kimchi?

If Ginger implements all backend of the network operations, for
example, and Kimchi has only the frontend using the interface provided
by Ginger, I will not able to execute all necessary operations to
create some special virtual networks. This approach will require the
user to install both Kimchi and Ginger, always. And I guess this not
what the projects want, for now!

These are my 2 cents and you can not consider it totally since I'm
coming back to the project :-D

Best regards,
Paulo

> 
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-- 
Paulo Ricardo Paz Vital <pvital at linux.vnet.ibm.com>
IBM Linux Technology Center