# Copyright: (c) 2020, quidame <quidame@poivron.org>
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
from __future__ import absolute_import, division, print_function
__metaclass__ = type
import time
from ansible.plugins.action import ActionBase
from ansible.errors import AnsibleError, AnsibleActionFail, AnsibleConnectionFailure
from ansible.utils.vars import merge_hash
from ansible.utils.display import Display
display = Display()
class ActionModule(ActionBase):
# Keep internal params away from user interactions
_VALID_ARGS = frozenset(('path', 'state', 'table', 'noflush', 'counters', 'modprobe', 'ip_version', 'wait'))
DEFAULT_SUDOABLE = True
MSG_ERROR__ASYNC_AND_POLL_NOT_ZERO = (
"This module doesn't support async>0 and poll>0 when its 'state' param "
"is set to 'restored'. To enable its rollback feature (that needs the "
"module to run asynchronously on the remote), please set task attribute "
"'poll' (=%s) to 0, and 'async' (=%s) to a value >2 and not greater than "
"'ansible_timeout' (=%s) (recommended).")
MSG_WARNING__NO_ASYNC_IS_NO_ROLLBACK = (
"Attempts to restore iptables state without rollback in case of mistake "
"may lead the ansible controller to loose access to the hosts and never "
"regain it before fixing firewall rules through a serial console, or any "
"other way except SSH. Please set task attribute 'poll' (=%s) to 0, and "
"'async' (=%s) to a value >2 and not greater than 'ansible_timeout' (=%s) "
"(recommended).")
MSG_WARNING__ASYNC_GREATER_THAN_TIMEOUT = (
"You attempt to restore iptables state with rollback in case of mistake, "
"but with settings that will lead this rollback to happen AFTER that the "
"controller will reach its own timeout. Please set task attribute 'poll' "
"(=%s) to 0, and 'async' (=%s) to a value >2 and not greater than "
"'ansible_timeout' (=%s) (recommended).")
def _async_result(self, module_args, task_vars, timeout):
'''
Retrieve results of the asynchonous task, and display them in place of
the async wrapper results (those with the ansible_job_id key).
'''
# At least one iteration is required, even if timeout is 0.
for i in range(max(1, timeout)):
async_result = self._execute_module(
module_name='ansible.builtin.async_status',
module_args=module_args,
task_vars=task_vars,
wrap_async=False)
if async_result['finished'] == 1:
break
time.sleep(min(1, timeout))
return async_result
def run(self, tmp=None, task_vars=None):
self._supports_check_mode = True
self._supports_async = True
result = super(ActionModule, self).run(tmp, task_vars)
del tmp # tmp no longer has any effect
if not result.get('skipped'):
# FUTURE: better to let _execute_module calculate this internally?
wrap_async = self._task.async_val and not self._connection.has_native_async
# Set short names for values we'll have to compare or reuse
task_poll = self._task.poll
task_async = self._task.async_val
check_mode = self._play_context.check_mode
max_timeout = self._connection._play_context.timeout
module_name = self._task.action
module_args = self._task.args
if module_args.get('state', None) == 'restored':
if not wrap_async:
if not check_mode:
display.warning(self.MSG_WARNING__NO_ASYNC_IS_NO_ROLLBACK % (
task_poll,
task_async,
max_timeout))
elif task_poll:
raise AnsibleActionFail(self.MSG_ERROR__ASYNC_AND_POLL_NOT_ZERO % (
task_poll,
task_async,
max_timeout))
else:
if task_async > max_timeout and not check_mode:
display.warning(self.MSG_WARNING__ASYNC_GREATER_THAN_TIMEOUT % (
task_poll,
task_async,
max_timeout))
# BEGIN snippet from async_status action plugin
env_async_dir = [e for e in self._task.environment if
"ANSIBLE_ASYNC_DIR" in e]
if len(env_async_dir) > 0:
# for backwards compatibility we need to get the dir from
# ANSIBLE_ASYNC_DIR that is defined in the environment. This is
# deprecated and will be removed in favour of shell options
async_dir = env_async_dir[0]['ANSIBLE_ASYNC_DIR']
msg = "Setting the async dir from the environment keyword " \
"ANSIBLE_ASYNC_DIR is deprecated. Set the async_dir " \
"shell option instead"
display.deprecated(msg, version='2.0.0',
collection_name='community.general') # was Ansible 2.12
else:
# inject the async directory based on the shell option into the
# module args
async_dir = self.get_shell_option('async_dir', default="~/.ansible_async")
# END snippet from async_status action plugin
# Bind the loop max duration to consistent values on both
# remote and local sides (if not the same, make the loop
# longer on the controller); and set a backup file path.
module_args['_timeout'] = task_async
module_args['_back'] = '%s/iptables.state' % async_dir
async_status_args = dict(_async_dir=async_dir)
confirm_cmd = 'rm -f %s' % module_args['_back']
starter_cmd = 'touch %s.starter' % module_args['_back']
remaining_time = max(task_async, max_timeout)
# do work!
result = merge_hash(result, self._execute_module(module_args=module_args, task_vars=task_vars, wrap_async=wrap_async))
# Then the 3-steps "go ahead or rollback":
# 1. Catch early errors of the module (in asynchronous task) if any.
# Touch a file on the target to signal the module to process now.
# 2. Reset connection to ensure a persistent one will not be reused.
# 3. Confirm the restored state by removing the backup on the remote.
# Retrieve the results of the asynchronous task to return them.
if '_back' in module_args:
async_status_args['jid'] = result.get('ansible_job_id', None)
if async_status_args['jid'] is None:
raise AnsibleActionFail("Unable to get 'ansible_job_id'.")
# Catch early errors due to missing mandatory option, bad
# option type/value, missing required system command, etc.
result = merge_hash(result, self._async_result(async_status_args, task_vars, 0))
# The module is aware to not process the main iptables-restore
# command before finding (and deleting) the 'starter' cookie on
# the host, so the previous query will not reach ssh timeout.
garbage = self._low_level_execute_command(starter_cmd, sudoable=self.DEFAULT_SUDOABLE)
# As the main command is not yet executed on the target, here
# 'finished' means 'failed before main command be executed'.
if not result['finished']:
try:
self._connection.reset()
except AttributeError:
pass
for x in range(max_timeout):
time.sleep(1)
remaining_time -= 1
# - AnsibleConnectionFailure covers rejected requests (i.e.
# by rules with '--jump REJECT')
# - ansible_timeout is able to cover dropped requests (due
# to a rule or policy DROP) if not lower than async_val.
try:
garbage = self._low_level_execute_command(confirm_cmd, sudoable=self.DEFAULT_SUDOABLE)
break
except AnsibleConnectionFailure:
continue
result = merge_hash(result, self._async_result(async_status_args, task_vars, remaining_time))
# Cleanup async related stuff and internal params
for key in ('ansible_job_id', 'results_file', 'started', 'finished'):
if result.get(key):
del result[key]
if result.get('invocation', {}).get('module_args'):
if '_timeout' in result['invocation']['module_args']:
del result['invocation']['module_args']['_back']
del result['invocation']['module_args']['_timeout']
async_status_args['mode'] = 'cleanup'
garbage = self._execute_module(
module_name='ansible.builtin.async_status',
module_args=async_status_args,
task_vars=task_vars,
wrap_async=False)
if not wrap_async:
# remove a temporary path we created
self._remove_tmp_path(self._connection._shell.tmpdir)
return result