group_vars by multiple criteria

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Hello. I have an interesting scenario that I have been pondering and would like some input from the community. I would like to apply group_vars to series of servers, that are defined by application roles and also defined by the environments production and pre-producution, So the filter order should be: role → environment

I am using dynamic inventory, in specific, AWS.

The following tags are used:

  • tag_environment_prod

  • tag_environment_preprod

  • tag_role_app1

  • tag_role_app2
    EC2 instances would be tagged the following way:

preprod-app1: tag_environment_preprod, tag_role_app1
preprod-app2: tag_environment_preprod, tag_role_app2

prod-app1 :tag_environment_prod, tag_role_app1
Etc…

Regardless of the role assigned to that server, it shares a common configuration file:

#app.conf
APP_KEY={{ app_key }}
APP_THING1={{ app_thing1 }}
APP_THING2={{ app_thing2 }}

My goal is to first filter groups based upon role, then based upon environment. Maybe something like:

/group_vars
/app1_prod
/app1_preprod
/app2_prod
/app2_preprod

Using a dynamic inventory, how can I accomplish this filter using more than one EC2 tag?

Thanks!
Brian