ansible - example of generating complex fact using jinja, and passing to role

00_play.yml

---
- hosts: localhost
  connection: local
  gather_facts: no
  vars:
    foo: bar
    cops_es_nginx_foo: bar
  tasks:

    - set_fact:
        es_vhost: |
          {% set nginx = {'v': {}} %}
          {% set o = 'cops_es_nginx_' %}
          {% set p = 'corpusops_nginx_' %}
          {% for i, val in vars.items() %}
          {%  if i.startswith(o) %}
          {%    set _ = nginx.v.update({p+o.join(i.split(o)[1:]): val}) %}
          {%  endif %}
          {% endfor %}
          {{ nginx.v | to_json }}

    - debug:
        var: es_vhost

    - include_role:
        name: test
      vars:
        role_vhost: '{{ es_vhost }}'

01_main.yml

# roles/test/tasks/main.yml
---
- debug:
    var: role_vhost

02_output

PLAY [localhost] ***************************************************************************************************************************************************************************************************************************************************************

TASK [set_fact] ****************************************************************************************************************************************************************************************************************************************************************
ok: [localhost]

TASK [debug] *******************************************************************************************************************************************************************************************************************************************************************
ok: [localhost] => {
    "es_vhost": {
        "corpusops_nginx_foo": "bar"
    }
}

TASK [test : debug] ************************************************************************************************************************************************************************************************************************************************************
ok: [localhost] => {
    "role_vhost": {
        "corpusops_nginx_foo": "bar"
    }
}

PLAY RECAP *********************************************************************************************************************************************************************************************************************************************************************
localhost                  : ok=3    changed=0    unreachable=0    failed=0