use ansible_facts in module code

Question

I am trying to create my own ansible module (which will update cmdb) and i am looking how to use ansible_facts in module code ?

example of my module script is :

Answer 1

I doubt this is possible from inside module itself, because they are executed in the context of remote machine with predefined parameters.

But you can wrap your module with action plugin (that is executed in local context), collect required data from available variables and pass them as parameters to your module.

Like this (./action_plugins/a_test.py):

from ansible.plugins.action import ActionBase

class ActionModule(ActionBase):

    def run(self, tmp=None, task_vars=None):

        result = super(ActionModule, self).run(tmp, task_vars)

        module_args = self._task.args.copy()
        module_args['mem_size'] = self._templar._available_variables.get('ansible_memtotal_mb')

        return self._execute_module(module_args=module_args, task_vars=task_vars, tmp=tmp)

In this case if your module expect mem_size parameter it will be set to ansible_memtotal_mb's value with action plugin.

Module example (./library/a_test.py):

#!/usr/bin/python

def main():
    module = AnsibleModule(
        argument_spec = dict(
            mem_size=dict(required=False, default=None),
        ),
        supports_check_mode = False
    )

    module.exit_json(changed=False, mem_size=module.params['mem_size'])

from ansible.module_utils.basic import *
from ansible.module_utils.urls import *

main()

Test playbook:

---
- hosts: all
  tasks:
    - a_test: