community.docker/plugins/modules/docker_node_info.py

#!/usr/bin/python
#
# Copyright (c) 2019 Piotr Wojciechowski <piotr@it-playground.pl>
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later

from __future__ import annotations


DOCUMENTATION = r"""
module: docker_node_info

short_description: Retrieves facts about docker swarm node from Swarm Manager

description:
  - Retrieves facts about a docker node.
  - Essentially returns the output of C(docker node inspect <name>).
  - Must be executed on a host running as Swarm Manager, otherwise the module will fail.
extends_documentation_fragment:
  - community.docker.docker
  - community.docker.docker.docker_py_1_documentation
  - community.docker.attributes
  - community.docker.attributes.actiongroup_docker
  - community.docker.attributes.info_module
  - community.docker.attributes.idempotent_not_modify_state

options:
  name:
    description:
      - The name of the node to inspect.
      - The list of nodes names to inspect.
      - If empty then return information of all nodes in Swarm cluster.
      - When identifying the node use either the hostname of the node (as registered in Swarm) or node ID.
      - If O(self=true) then this parameter is ignored.
    type: list
    elements: str
  self:
    description:
      - If V(true), queries the node (that is, the docker daemon) the module communicates with.
      - If V(true) then O(name) is ignored.
      - If V(false) then query depends on O(name) presence and value.
    type: bool
    default: false

author:
  - Piotr Wojciechowski (@WojciechowskiPiotr)

requirements:
  - "L(Docker SDK for Python,https://docker-py.readthedocs.io/en/stable/) >= 2.4.0"
  - "Docker API >= 1.25"
"""

EXAMPLES = r"""
---
- name: Get info on all nodes
  community.docker.docker_node_info:
  register: result

- name: Get info on node
  community.docker.docker_node_info:
    name: mynode
  register: result

- name: Get info on list of nodes
  community.docker.docker_node_info:
    name:
      - mynode1
      - mynode2
  register: result

- name: Get info on host if it is Swarm Manager
  community.docker.docker_node_info:
    self: true
  register: result
"""

RETURN = r"""
nodes:
  description:
    - Facts representing the current state of the nodes. Matches the C(docker node inspect) output.
    - Can contain multiple entries if more than one node provided in O(name), or O(name) is not provided.
    - If O(name) contains a list of nodes, the output will provide information on all nodes registered at the swarm, including
      nodes that left the swarm but have not been removed from the cluster on swarm managers and nodes that are unreachable.
  returned: always
  type: list
  elements: dict
"""

import traceback

from ansible.module_utils.common.text.converters import to_native

from ansible_collections.community.docker.plugins.module_utils.common import (
    RequestException,
)
from ansible_collections.community.docker.plugins.module_utils.swarm import AnsibleDockerSwarmClient

try:
    from docker.errors import DockerException
except ImportError:
    # missing Docker SDK for Python handled in ansible.module_utils.docker.common
    pass


def get_node_facts(client):

    results = []

    if client.module.params['self'] is True:
        self_node_id = client.get_swarm_node_id()
        node_info = client.get_node_inspect(node_id=self_node_id)
        results.append(node_info)
        return results

    if client.module.params['name'] is None:
        node_info = client.get_all_nodes_inspect()
        return node_info

    nodes = client.module.params['name']
    if not isinstance(nodes, list):
        nodes = [nodes]

    for next_node_name in nodes:
        next_node_info = client.get_node_inspect(node_id=next_node_name, skip_missing=True)
        if next_node_info:
            results.append(next_node_info)
    return results


def main():
    argument_spec = dict(
        name=dict(type='list', elements='str'),
        self=dict(type='bool', default=False),
    )

    client = AnsibleDockerSwarmClient(
        argument_spec=argument_spec,
        supports_check_mode=True,
        min_docker_version='2.4.0',
    )

    client.fail_task_if_not_swarm_manager()

    try:
        nodes = get_node_facts(client)

        client.module.exit_json(
            changed=False,
            nodes=nodes,
        )
    except DockerException as e:
        client.fail('An unexpected docker error occurred: {0}'.format(to_native(e)), exception=traceback.format_exc())
    except RequestException as e:
        client.fail(
            'An unexpected requests error occurred when Docker SDK for Python tried to talk to the docker daemon: {0}'.format(to_native(e)),
            exception=traceback.format_exc())


if __name__ == '__main__':
    main()