[Python API] How to render jinja2 template from within python / retrieve list of variables for the currently executed play&task.

[Cukier]

Recently I've been trying to mess a little with Ansible's Python API (I am well aware it is not recommended, and python API is meant only for internal use, however...).

My goal was to create a function that's able to retrieve data from ansible-playbook, which basically means two things:

1. retrieve the raw data by parsing YAML files,
> the simplest solution, is to let ansible do this, and then pass "{{ vars }}" to the module/plugin (at the level of YAML file)
> a more complicated solution is to use: ansible.vars.manager.VariableManager

2. render the jinja2 template
> because ansible stores them, inside variables, instead of what they evaluate to. 
> that's why I need/want to render jinja2 using ansible's API, at the level of .py file.

Questions:
1. is there any way to retrieve current play & current task from within a .py file from within a module/plugin (when a said module/plugin is being executed, just like the code below), so I can pass it to the variables = variable_manager.get_vars(...) 2. is there a better way to do what I am trying to do?

from ansible import context

from ansible.inventory.manager import InventoryManager

from ansible.parsing.dataloader import DataLoader

from ansible.template import Templar

from ansible.vars.manager import VariableManager

def render(template):

   """

   Render jinja2 template using Anisble's API.

   """

   options = context.CLIARGS

   sources = options['inventory']

   loader = DataLoader()

   inventory = InventoryManager(

       loader = loader,

       sources = sources

   )

   variable_manager = VariableManager(

       loader = loader,

        inventory = inventory

   )

   templar = Templar(

       loader = DataLoader(),

       variables = variable_manager.get_vars(...) # <<< HERE

   )

   return templar.template(template)

def filter_render_test(*args, **kwargs):

   return render("{{ foo }}")

class FilterModule(object):

   def filters(self):

       return {

           'render_test': filter_render_test,

       }

and the corresponding playbook:

---
- name: Test jinja2 renderer.
  hosts: all
  vars:
  - foo: "success"
  tasks:
  - debug:
      msg: "{{ '' | render_test }}"
...