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Ashwin Kumar

Invoking Ansible Inside Python Flask

Pasting sample code that can be used as is to run ansible inside python flask app. This would be a very useful base implementation when devops need to control system over the web or someone tries to control systems over internet without cli.

Prerequisites

Install Python3

#PYTHON3 ( Assuming Centos7 or RHEL Flavor). Change accordingly for your env

yum -y install https://centos7.iuscommunity.org/ius-release.rpm
yum -y install python36u
yum -y install python36u-pip
yum -y install python36u-devel

virtualenv –python=/usr/bin/python3.6 venv
from flask import (Blueprint)

import json
import shutil
from collections import namedtuple
from ansible.parsing.dataloader import DataLoader
from ansible.vars.manager import VariableManager
from ansible.inventory.manager import InventoryManager
from ansible.playbook.play import Play
from ansible.executor.task_queue_manager import TaskQueueManager
from ansible.plugins.callback import CallbackBase
import ansible.constants as C


#Blueprint URL Configuration routes
bp = Blueprint('AnsibleController', __name__, url_prefix='/AnsibleController')


# Ansible Return callback
class ResultCallback(CallbackBase):
    """A sample callback plugin used for performing an action as results come in

    If you want to collect all results into a single object for processing at
    the end of the execution, look into utilizing the ``json`` callback plugin
    or writing your own custom callback plugin
    """
    def __init__(self):
        self.resp = []

    def v2_runner_on_ok(self, result, **kwargs):
        """Print a json representation of the result

        This method could store the result in an instance attribute for retrieval later
        """
        host = result._host
        self.resp.append(json.dumps({host.name: result._result}, indent=4))

#print (json.dumps(out, sort_keys=True, indent=4, separators=(',', ': ')))

@bp.route('/ping', methods=('GET', 'POST'))
def ping():
    # since API is constructed for CLI it expects certain options to always be set, named tuple 'fakes' the args parsing options object
    Options = namedtuple('Options',
                         ['connection', 'module_path', 'forks', 'become', 'become_method', 'become_user', 'check',
                          'diff'])
    options = Options(connection='local', module_path=['/etc/swiftui/.swiftui/ansible/mymodules'], forks=100, become=None, become_method=None,
                      become_user=None, check=False, diff=False)

    # initialize needed objects
    loader = DataLoader()  # Takes care of finding and reading yaml, json and ini files
    passwords = dict(vault_pass='secret')

    # Instantiate our ResultCallback for handling results as they come in. Ansible expects this to be one of its main display outlets
    results_callback = ResultCallback()

    # create inventory, use path to host config file as source or hosts in a comma separated string
    inventory = InventoryManager(loader=loader, sources='localhost,')

    # variable manager takes care of merging all the different sources to give you a unifed view of variables available in each context
    variable_manager = VariableManager(loader=loader, inventory=inventory)

    # create datastructure that represents our play, including tasks, this is basically what our YAML loader does internally.
    play_source = dict(
        name="Ansible Play",
        hosts='localhost',
        gather_facts='no',
        tasks=[
            dict(action=dict(module='shell', args='ls'), register='shell_out'),
            dict(action=dict(module='debug', args=dict(msg='{{shell_out.stdout}}')))
        ]
    )

    # Create play object, playbook objects use .load instead of init or new methods,
    # this will also automatically create the task objects from the info provided in play_source
    play = Play().load(play_source, variable_manager=variable_manager, loader=loader)

    # Run it - instantiate task queue manager, which takes care of forking and setting up
    # all objects to iterate over host list and tasks
    tqm = None
    try:
        tqm = TaskQueueManager(
            inventory=inventory,
            variable_manager=variable_manager,
            loader=loader,
            options=options,
            passwords=passwords,
            stdout_callback=results_callback,
            # Use our custom callback instead of the ``default`` callback plugin, which prints to stdout
        )
        result = tqm.run(play)  # most interesting data for a play is actually sent to the callback's methods
    finally:
        # we always need to cleanup child procs and the structres we use to communicate with them
        if tqm is not None:
            tqm.cleanup()

        # Remove ansible tmpdir
        shutil.rmtree(C.DEFAULT_LOCAL_TMP, True)

    return ''.join(results_callback.resp)
Published on Web Code Geeks with permission by Ashwin Kumar, partner at our WCG program. See the original article here: Invoking Ansible Inside Python Flask

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