ansible/test/units/executor/test_task_queue_manager_callbacks.py

# (c) 2016, Steve Kuznetsov <skuznets@redhat.com>
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.

# Make coding more python3-ish
from __future__ import (absolute_import, division, print_function)

from units.compat import unittest
from mock import MagicMock

from ansible.executor.task_queue_manager import TaskQueueManager
from ansible.playbook import Playbook
from ansible.plugins.callback import CallbackBase
from ansible.utils import context_objects as co

__metaclass__ = type


class TestTaskQueueManagerCallbacks(unittest.TestCase):
    def setUp(self):
        inventory = MagicMock()
        variable_manager = MagicMock()
        loader = MagicMock()
        passwords = []

        # Reset the stored command line args
        co.GlobalCLIArgs._Singleton__instance = None
        self._tqm = TaskQueueManager(inventory, variable_manager, loader, passwords)
        self._playbook = Playbook(loader)

        # we use a MagicMock to register the result of the call we
        # expect to `v2_playbook_on_call`. We don't mock out the
        # method since we're testing code that uses `inspect` to
        # look at that method's argspec and we want to ensure this
        # test is easy to reason about.
        self._register = MagicMock()

    def tearDown(self):
        # Reset the stored command line args
        co.GlobalCLIArgs._Singleton__instance = None

    def test_task_queue_manager_callbacks_v2_playbook_on_start(self):
        """
        Assert that no exceptions are raised when sending a Playbook
        start callback to a current callback module plugin.
        """
        register = self._register

        class CallbackModule(CallbackBase):
            """
            This is a callback module with the current
            method signature for `v2_playbook_on_start`.
            """
            CALLBACK_VERSION = 2.0
            CALLBACK_TYPE = 'notification'
            CALLBACK_NAME = 'current_module'

            def v2_playbook_on_start(self, playbook):
                register(self, playbook)

        callback_module = CallbackModule()
        self._tqm._callback_plugins.append(callback_module)
        self._tqm.send_callback('v2_playbook_on_start', self._playbook)
        register.assert_called_once_with(callback_module, self._playbook)

    def test_task_queue_manager_callbacks_v2_playbook_on_start_wrapped(self):
        """
        Assert that no exceptions are raised when sending a Playbook
        start callback to a wrapped current callback module plugin.
        """
        register = self._register

        def wrap_callback(func):
            """
            This wrapper changes the exposed argument
            names for a method from the original names
            to (*args, **kwargs). This is used in order
            to validate that wrappers which change par-
            ameter names do not break the TQM callback
            system.

            :param func: function to decorate
            :return: decorated function
            """

            def wrapper(*args, **kwargs):
                return func(*args, **kwargs)

            return wrapper

        class WrappedCallbackModule(CallbackBase):
            """
            This is a callback module with the current
            method signature for `v2_playbook_on_start`
            wrapped in order to change the signature.
            """
            CALLBACK_VERSION = 2.0
            CALLBACK_TYPE = 'notification'
            CALLBACK_NAME = 'current_module'

            @wrap_callback
            def v2_playbook_on_start(self, playbook):
                register(self, playbook)

        callback_module = WrappedCallbackModule()
        self._tqm._callback_plugins.append(callback_module)
        self._tqm.send_callback('v2_playbook_on_start', self._playbook)
        register.assert_called_once_with(callback_module, self._playbook)