ansible.utils/plugins/lookup/get_path.py

# -*- coding: utf-8 -*-
# Copyright 2020 Red Hat
# GNU General Public License v3.0+
# (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)


"""
The get_path lookup plugin
"""
from __future__ import absolute_import, division, print_function


__metaclass__ = type


DOCUMENTATION = """
    name: get_path
    author: Bradley Thornton (@cidrblock)
    version_added: "1.0.0"
    short_description: Retrieve the value in a variable using a path
    description:
      - Use a I(path) to retrieve a nested value from a I(var)
      - B(get_path) is also available as a B(filter plugin) for convenience
      - Using the parameters below- C(lookup('ansible.utils.get_path', var, path, wantlist))
    options:
      var:
        description:
          - The variable from which the value should be extracted.
        type: raw
        required: True
      path:
        description:
          - The I(path) in the I(var) to retrieve the value of.
          - The I(path) needs to a be a valid jinja path.
        type: str
        required: True
      wantlist:
        description:
          - If set to C(True), the return value will always be a list.
          - This can also be accomplished using C(query) or C(q) instead of C(lookup).
          - U(https://docs.ansible.com/ansible/latest/plugins/lookup.html).
        type: bool

    notes:
"""

EXAMPLES = r"""
- ansible.builtin.set_fact:
    a:
      b:
        c:
          d:
            - 0
            - 1
          e:
            - true
            - false

- name: Retrieve a value deep inside a using a path
  ansible.builtin.set_fact:
    value: "{{ lookup('ansible.utils.get_path', a, path) }}"
  vars:
    path: b.c.d[0]

# TASK [Retrieve a value deep inside a using a path] ******************
# ok: [localhost] => changed=false
#   ansible_facts:
#     value: '0'


#### Working with hostvars

- name: Retrieve a value deep inside all of the host's vars
  ansible.builtin.set_fact:
    value: "{{ lookup('ansible.utils.get_path', look_in, look_for) }}"
  vars:
    look_in: "{{ hostvars[inventory_hostname] }}"
    look_for: a.b.c.d[0]

# TASK [Retrieve a value deep inside all of the host's vars] ********
# ok: [nxos101] => changed=false
#   ansible_facts:
#     as_filter: '0'
#     as_lookup: '0'


#### Used alongside ansible.utils.to_paths

- name: Get the paths for the object
  ansible.builtin.set_fact:
    paths: "{{ lookup('ansible.utils.to_paths', a, prepend='a') }}"

- name: Retrieve the value of each path from vars
  ansible.builtin.debug:
    msg: "The value of path {{ path }} in vars is {{ value }}"
  loop: "{{ paths.keys()|list }}"
  loop_control:
    label: "{{ item }}"
  vars:
    path: "{{ item }}"
    value: "{{ lookup('ansible.utils.get_path', hostvars[inventory_hostname], item) }}"

# TASK [Get the paths for the object] *******************************
# ok: [nxos101] => changed=false
#   ansible_facts:
#     paths:
#       a.b.c.d[0]: 0
#       a.b.c.d[1]: 1
#       a.b.c.e[0]: True
#       a.b.c.e[1]: False

# TASK [Retrieve the value of each path from vars] ******************
# ok: [nxos101] => (item=a.b.c.d[0]) =>
#   msg: The value of path a.b.c.d[0] in vars is 0
# ok: [nxos101] => (item=a.b.c.d[1]) =>
#   msg: The value of path a.b.c.d[1] in vars is 1
# ok: [nxos101] => (item=a.b.c.e[0]) =>
#   msg: The value of path a.b.c.e[0] in vars is True
# ok: [nxos101] => (item=a.b.c.e[1]) =>
#   msg: The value of path a.b.c.e[1] in vars is False


#### Working with complex structures and transforming results

- name: Retrieve the current interface config
  cisco.nxos.nxos_interfaces:
    state: gathered
  register: interfaces

- name: Get the description of several interfaces
  ansible.builtin.debug:
    msg: "{{ lookup('ansible.utils.get_path', rekeyed, item) }}"
  vars:
    rekeyed:
      by_name: "{{ interfaces.gathered|ansible.builtin.rekey_on_member('name') }}"
  loop:
    - by_name['Ethernet1/1'].description
    - by_name['Ethernet1/2'].description|upper
    - by_name['Ethernet1/3'].description|default('')


# TASK [Get the description of several interfaces] ******************
# ok: [nxos101] => (item=by_name['Ethernet1/1'].description) => changed=false
#   msg: Configured by ansible
# ok: [nxos101] => (item=by_name['Ethernet1/2'].description|upper) => changed=false
#   msg: CONFIGURED BY ANSIBLE
# ok: [nxos101] => (item=by_name['Ethernet1/3'].description|default('')) => changed=false
#   msg: ''
"""

RETURN = """
  _raw:
    description:
      - One or more zero-based indices of the matching list items.
      - See C(wantlist) if a list is always required.
"""

from ansible.errors import AnsibleLookupError
from ansible.plugins.lookup import LookupBase

from ansible_collections.ansible.utils.plugins.module_utils.common.argspec_validate import (
    AnsibleArgSpecValidator,
)
from ansible_collections.ansible.utils.plugins.module_utils.common.get_path import get_path


class LookupModule(LookupBase):
    def run(self, terms, variables, **kwargs):
        if isinstance(terms, list):
            keys = ["var", "path"]
            terms = dict(zip(keys, terms))
        terms.update(kwargs)

        aav = AnsibleArgSpecValidator(data=terms, schema=DOCUMENTATION, name="get_path")
        valid, errors, updated_data = aav.validate()
        if not valid:
            raise AnsibleLookupError(errors)
        updated_data["wantlist"] = True
        updated_data["environment"] = self._templar.environment
        res = get_path(**updated_data)
        return res