Accessing variable data from a filter

[Akos Vandra]

Hello!

I might be going around the problem in the wrong way, but I seem to need to access the variable cache from a filter plugin.

I am trying to create a map filter, that can be used like so:

- name: Test Play

  hosts: 127.0.0.1

  connection: local

  vars:

    input:

      - foo

      - bar

    data:

      foo: 4

      bar: 5

      baz: 6

  tasks:

    - debug: msg="{{ input | map("{{data[__in__]}}") }}"

I am expecting it to print [4,5].

It seems that the way to solve it was to include a jinja expression as the parameter to the filter which will be evaluated for each element of the list, by substituting their value in place of the __in__ symbol, which I took the liberty to hard-code.

Unfortunately for this to work I need to be able to access the variable cache within the filter:

from ansible.utils import template

def _map(arg, expr):

    vars = {}

    return map(lambda x: template.template_from_string(None, expr, dict(vars, __in__ = x), True), list(arg))

class FilterModule(object):

    ''' Ansible extra jinja2 filters '''

    def filters(self):

        return {

            'map': _map,

        }

This results in an error:

fatal: [127.0.0.1] => One or more undefined variables: 'data' is undefined

I have been browsing through the code for 3 hours, but could not find a way to get a copy of all variables, similar to task.py: https://github.com/ansible/ansible/blob/devel/lib/ansible/playbook/task.py#L225,L230

Can anyone lend a hand?

Thanks,

  Akos Vandra

[Brian Coca]

first of all, 'map' is an existing jinja2 filter, also currently
filters have no way to access the variable cache, they only deal with
data passed to them.

--
Brian Coca

[Akos Vandra]

I know map is an existing jinja2 filter, but as far as I see they are capable of calling "methods" only on the elements themselves, and they are not able to be used as I would intend to. 

But, please, correct me if i'm wrong.

Akos

--
Brian Coca

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