mitogen/ansible_mitogen/loaders.py

# Copyright 2019, David Wilson
#
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# modification, are permitted provided that the following conditions are met:
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# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
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"""
Stable names for PluginLoader instances across Ansible versions.
"""

from __future__ import absolute_import, division, print_function
__metaclass__ = type

import ansible.errors

import ansible_mitogen.utils

__all__ = [
    'action_loader',
    'become_loader',
    'connection_loader',
    'module_loader',
    'module_utils_loader',
    'shell_loader',
    'strategy_loader',
]


ANSIBLE_VERSION_MIN = (2, 10)
ANSIBLE_VERSION_MAX = (2, 17)

NEW_VERSION_MSG = (
    "Your Ansible version (%s) is too recent. The most recent version\n"
    "supported by Mitogen for Ansible is %s.x. Please check the Mitogen\n"
    "release notes to see if a new version is available, otherwise\n"
    "subscribe to the corresponding GitHub issue to be notified when\n"
    "support becomes available.\n"
    "\n"
    "    https://mitogen.rtfd.io/en/latest/changelog.html\n"
    "    https://github.com/mitogen-hq/mitogen/issues/\n"
)
OLD_VERSION_MSG = (
    "Your version of Ansible (%s) is too old. The oldest version supported by "
    "Mitogen for Ansible is %s."
)


def assert_supported_release():
    """
    Throw AnsibleError with a descriptive message in case of being loaded into
    an unsupported Ansible release.
    """
    v = ansible_mitogen.utils.ansible_version
    if v[:2] < ANSIBLE_VERSION_MIN:
        raise ansible.errors.AnsibleError(
            OLD_VERSION_MSG % (v, ANSIBLE_VERSION_MIN)
        )

    if v[:2] > ANSIBLE_VERSION_MAX:
        raise ansible.errors.AnsibleError(
            NEW_VERSION_MSG % (v, ANSIBLE_VERSION_MAX)
        )


# this is the first file our strategy plugins import, so we need to check this here
# in prior Ansible versions, connection_loader.get_with_context didn't exist, so if a user
# is trying to load an old Ansible version, we'll fail and error gracefully
assert_supported_release()


from ansible.plugins.loader import action_loader
from ansible.plugins.loader import become_loader
from ansible.plugins.loader import connection_loader
from ansible.plugins.loader import module_loader
from ansible.plugins.loader import module_utils_loader
from ansible.plugins.loader import shell_loader
from ansible.plugins.loader import strategy_loader

# These are original, unwrapped implementations
action_loader__get = action_loader.get
connection_loader__get = connection_loader.get_with_context