[openstack-dev] [Mistral] Converging discussions on WF context and WF/task/action inputs

Anastasia Kuznetsova akuznetsova at mirantis.com
Wed Dec 24 13:34:15 UTC 2014


thanks for response!
One more question:

 So that same workflows could be running in different environments

Asking about using a few environments I meant within one workflow. For
example I need to work with two DB and I have two environments: env1 =
{"conn_str": ip, "user": user, "password": passwd} and env2 = {"conn_str":
ip2, "user": user2, "password": passwd2}. Will it be possible to do
something like this:

      action: std.sql conn_str={$.env1.conn_str} query={$.query}
         records: $
      action: std.sql conn_str={$.env2.conn_str} query={$.query}
         records: $

Anastasia Kuznetsova

On Wed, Dec 24, 2014 at 2:19 PM, Renat Akhmerov <rakhmerov at mirantis.com>

> On 24 Dec 2014, at 14:06, Anastasia Kuznetsova <akuznetsova at mirantis.com>
> wrote:
> 1) How does the end user will pass env variables to workflow?Will you add
> one more optional parameter to execution-create command?
> mistral execution-create wf wf_input wf_params wf_env
> If yes than what is wf_env will be, json file?
> Yes. IMO it should be possible to specify either a string (name of a
> previously stored environment) or a json file (so called ad-hoc
> environment).
> 2) Retuning to first example:
> ...
>  action: std.sql conn_str={$.env.conn_str} query={$.query}
> ...
> $.env - is it a name of environment or it will be a registered syntax to
> getting access to values from env ?
> So far we agreed that ‘key' should not be a registered key. Environment
> (optionally specified) is just another storage of variables going after
> workflow context in a lookup chain. So that if somewhere in a wf we have an
> expression $.something then this “something” will be first looked in
> workflow context and if it doesn’t exist there then looked in the specified
> environment.
> But if we want to explicitly group a set of variables we can use any
> (except for reserved as "__actions" ) key, for example, “env”.
> 3) Can user has a few environments?
> Yes. That’s one of the goals of introducing a concept of environment. So
> that same workflows could be running in different environments (e.g with
> different email settings, any kinds of passports etc.).
> Renat Akhmerov
> @ Mirantis Inc.
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