[openstack-dev] [solum] reviews for the new API

Julien Vey vey.julien at gmail.com
Wed Jun 4 15:58:59 UTC 2014

Hi Angus,

I really agree with you. I would insist on #3, most of our users will use
the default workbook, and only advanced users will want to customize the
workflow. "advanced" users should easily understand a mistral workbook,
cause they are "advanced"

To add to the cons of creating our own DSL, it will require a lot more
work, more design discussions, more maintenance... We might end up doing
what mistral is already doing. If we have some difficulties with Mistral's
DSL, we can talk with the team, and contribute back our experience of using


2014-06-04 14:11 GMT+02:00 Angus Salkeld <angus.salkeld at rackspace.com>:

> Hash: SHA1
> Hi all
> I have posted this series and it has evoked a surprising (to me) amount
> of discussion so I wanted to clarify some things and talk to some of the
> issues so we can move forward.
> So first note is this is an early posting and still is not tested much.
> https://review.openstack.org/#/q/status:open+project:stackforge/solum+branch:master+topic:new-api,n,z
> First the terminology
>    I have a pipeline meaning the association between a mistral workbook,
>    a trigger url and a plan. This is a running entity not just a
>    different workbook.
> The main issue seems to be the extent to which I am exposing the mistral
> workbook. Many of you expected a simpler workflow DSL that would be
> converted into the mistral workbook.
> The reason for me doing it this way are:
> 1) so we don't have to write much code
> 2) this is an iterative process. Let's try it the simple way first and
>    only make it more complicated if we really need to (the agile way?).
> 3) to be consistent in the way we treat heat templates, mistral
>    workbooks and language packs - i.e. we provide standard ones and
>    allow you to customize down to the underlying openstack primitives
>    if you want (we should aim for this to be only a small percentage
>    of our users).
>    eg. pipeline == (check-build-deploy mistral workbook +
>                     basic-docker heat template + custom plan)
>    here the user just choose the heat template and workbook from a list
>    of options.
> 4) if the mistral dsl is difficult for our users to work with we should
>    give the mistral devs a chance to improve it before working around
>    it.
> 5) our users are primary developers and I don't think the current
>    mistral DSL is tricky to figure out for someone that can code.
> 6) doing it this way we can make use of heat and mistral's horizon
>    plugins and link to them from the pipeline instead of having to
>    redo all of the same pages. In a similar why that heat links to
>    servers/volumes etc from a running stack.
> - -Angus
> Some things to note:
> - - the entire mistral engine can be replaced with an engine level plugin
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