Jinja2 - Concatenate string in a recursive loop - recursion

Question

I have an yaml ansible file like :
_app_config:
APP:
server: '"https://tst.example.com"'
uploadRefreshRate: 10
autonomous:
active: "false"
SiteId: 47
tests:
test1: 1
I would like to parse it and create a config file like :
APP.server = "https://tst.example.com"
APP.uploadRefreshRate = 10
APP.autonomous.active = false
APP.autonomous.SiteId = 47
APP.autonomous.tests.test1 = 1
So my jinja2 template looks like this :
{% if _app_config is defined %}
{% if _app_config.APP is defined %}
{% set key_chain = '' %}
{% for key,value in _app_config.APP.iteritems() recursive %}
{% if value is mapping %}
{% set key_chain = key_chain + key %}
{{ loop(value.iteritems()) }}
{% else %}
{% set param = 'APP.' + key_chain | string + '=' + value | string %}
{{ param | indent(loop.depth) }}
{% endif %}
{% endfor %}
{% endif %}
{% endif %}
So the result is not the one expected :)
APP.="common.core"
AGL.=None
AGL.=false AGL.=47
AGL.=1
AGL.="https://tst.example.com" AGL.=10
The values are not ordered and key_chain concatenation does not work...
Thanks for your help !

Answer 1

this python 'filter_plugin' below does that :
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
ANSIBLE_METADATA = {
'metadata_version': '1.1',
'status': ['preview'],
'supported_by': 'community'
}
from ansible.errors import AnsibleFilterError
def dict_path(my_dict, path=None, sort=True):
if isinstance(my_dict, dict):
def recurse(values, path):
for k, v in values.iteritems():
newpath = path + [k]
if isinstance(v, dict):
for u in recurse(v, newpath):
yield u
else:
yield newpath, v
if path is None:
path = []
g=recurse(my_dict, path)
if sort:
return sorted(sorted(g, key=lambda item: len(item[0])), key=lambda item: '.'.join(item[0]))
else:
return g
else:
raise AnsibleFilterError(my_dict + 'must be a dictionary')
# ---- Ansible filters ----
class FilterModule(object):
''' Dict path filter '''
def filters(self):
return {
'dict_path': dict_path
}
And add this code in your template :
{% for i in app_config | dict_path %}
{{ i.0 | join('.') }} = {{ i.1 }}
{% endfor %}
Pierre