632 lines
22 KiB
Python
632 lines
22 KiB
Python
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# Copyright 2019, David Wilson
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# 1. Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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#
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# 3. Neither the name of the copyright holder nor the names of its contributors
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# may be used to endorse or promote products derived from this software without
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# specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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"""
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Classes to detect each case from [0] and prepare arguments necessary for the
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corresponding Runner class within the target, including preloading requisite
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files/modules known missing.
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[0] "Ansible Module Architecture", developing_program_flow_modules.html
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"""
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from __future__ import absolute_import, division, print_function
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from __future__ import unicode_literals
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__metaclass__ = type
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import json
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import logging
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import os
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import random
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import re
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import ansible.collections.list
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import ansible.errors
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import ansible.executor.module_common
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import mitogen.core
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import mitogen.select
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import ansible_mitogen.loaders
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import ansible_mitogen.parsing
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import ansible_mitogen.target
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import ansible_mitogen.utils.unsafe
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LOG = logging.getLogger(__name__)
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NO_METHOD_MSG = 'Mitogen: no invocation method found for: '
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NO_INTERPRETER_MSG = 'module (%s) is missing interpreter line'
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# NOTE: Ansible 2.10 no longer has a `.` at the end of NO_MODULE_MSG error
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NO_MODULE_MSG = 'The module %s was not found in configured module paths'
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_planner_by_path = {}
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class Invocation(object):
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"""
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Collect up a module's execution environment then use it to invoke
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target.run_module() or helpers.run_module_async() in the target context.
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"""
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def __init__(self, action, connection, module_name, module_args,
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task_vars, templar, env, wrap_async, timeout_secs):
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#: ActionBase instance invoking the module. Required to access some
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#: output postprocessing methods that don't belong in ActionBase at
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#: all.
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self.action = action
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#: Ansible connection to use to contact the target. Must be an
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#: ansible_mitogen connection.
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self.connection = connection
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#: Name of the module ('command', 'shell', etc.) to execute.
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self.module_name = module_name
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#: Final module arguments.
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self.module_args = module_args
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#: Task variables, needed to extract ansible_*_interpreter.
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self.task_vars = task_vars
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#: Templar, needed to extract ansible_*_interpreter.
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self.templar = templar
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#: Final module environment.
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self.env = env
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#: Boolean, if :py:data:`True`, launch the module asynchronously.
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self.wrap_async = wrap_async
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#: Integer, if >0, limit the time an asynchronous job may run for.
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self.timeout_secs = timeout_secs
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#: Initially ``None``, but set by :func:`invoke`. The path on the
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#: master to the module's implementation file.
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self.module_path = None
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#: Initially ``None``, but set by :func:`invoke`. The raw source or
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#: binary contents of the module.
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self._module_source = None
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#: Initially ``{}``, but set by :func:`invoke`. Optional source to send
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#: to :func:`propagate_paths_and_modules` to fix Python3.5 relative import errors
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self._overridden_sources = {}
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#: Initially ``set()``, but set by :func:`invoke`. Optional source paths to send
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#: to :func:`propagate_paths_and_modules` to handle loading source dependencies from
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#: places outside of the main source path, such as collections
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self._extra_sys_paths = set()
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def get_module_source(self):
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if self._module_source is None:
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self._module_source = read_file(self.module_path)
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return self._module_source
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def __repr__(self):
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return 'Invocation(module_name=%s)' % (self.module_name,)
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class Planner(object):
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"""
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A Planner receives a module name and the contents of its implementation
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file, indicates whether or not it understands how to run the module, and
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exports a method to run the module.
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"""
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def __init__(self, invocation):
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self._inv = invocation
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@classmethod
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def detect(cls, path, source):
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"""
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Return true if the supplied `invocation` matches the module type
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implemented by this planner.
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"""
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raise NotImplementedError()
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def should_fork(self):
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"""
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Asynchronous tasks must always be forked.
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"""
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return self._inv.wrap_async
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def get_push_files(self):
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"""
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Return a list of files that should be propagated to the target context
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using PushFileService. The default implementation pushes nothing.
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"""
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return []
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def get_module_deps(self):
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"""
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Return a list of the Python module names imported by the module.
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"""
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return []
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def get_kwargs(self, **kwargs):
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"""
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If :meth:`detect` returned :data:`True`, plan for the module's
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execution, including granting access to or delivering any files to it
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that are known to be absent, and finally return a dict::
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{
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# Name of the class from runners.py that implements the
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# target-side execution of this module type.
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"runner_name": "...",
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# Remaining keys are passed to the constructor of the class
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# named by `runner_name`.
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}
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"""
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binding = self._inv.connection.get_binding()
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new = dict((mitogen.core.UnicodeType(k), kwargs[k])
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for k in kwargs)
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new.setdefault('good_temp_dir',
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self._inv.connection.get_good_temp_dir())
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new.setdefault('cwd', self._inv.connection.get_default_cwd())
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new.setdefault('extra_env', self._inv.connection.get_default_env())
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new.setdefault('emulate_tty', True)
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new.setdefault('service_context', binding.get_child_service_context())
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return new
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def __repr__(self):
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return '%s()' % (type(self).__name__,)
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class BinaryPlanner(Planner):
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"""
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Binary modules take their arguments and will return data to Ansible in the
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same way as want JSON modules.
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"""
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runner_name = 'BinaryRunner'
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@classmethod
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def detect(cls, path, source):
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return ansible.executor.module_common._is_binary(source)
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def get_push_files(self):
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return [mitogen.core.to_text(self._inv.module_path)]
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def get_kwargs(self, **kwargs):
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return super(BinaryPlanner, self).get_kwargs(
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runner_name=self.runner_name,
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module=self._inv.module_name,
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path=self._inv.module_path,
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json_args=json.dumps(self._inv.module_args),
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env=self._inv.env,
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**kwargs
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)
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class ScriptPlanner(BinaryPlanner):
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"""
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Common functionality for script module planners -- handle interpreter
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detection and rewrite.
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"""
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def _rewrite_interpreter(self, path):
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"""
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Given the interpreter path (from the script's hashbang line), return
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the desired interpreter path. This tries, in order
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1. Look up & render the `ansible_*_interpreter` variable, if set
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2. Look up the `discovered_interpreter_*` fact, if present
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3. The unmodified path from the hashbang line.
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:param str path:
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Absolute path to original interpreter (e.g. '/usr/bin/python').
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:returns:
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Shell fragment prefix used to execute the script via "/bin/sh -c".
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While `ansible_*_interpreter` documentation suggests shell isn't
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involved here, the vanilla implementation uses it and that use is
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exploited in common playbooks.
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"""
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interpreter_name = os.path.basename(path).strip()
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key = u'ansible_%s_interpreter' % interpreter_name
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try:
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template = self._inv.task_vars[key]
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except KeyError:
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pass
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else:
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configured_interpreter = self._inv.templar.template(template)
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return ansible_mitogen.utils.unsafe.cast(configured_interpreter)
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key = u'discovered_interpreter_%s' % interpreter_name
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try:
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discovered_interpreter = self._inv.task_vars['ansible_facts'][key]
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except KeyError:
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pass
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else:
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return ansible_mitogen.utils.unsafe.cast(discovered_interpreter)
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return path
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def _get_interpreter(self):
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path, arg = ansible_mitogen.parsing.parse_hashbang(
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self._inv.get_module_source()
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)
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if path is None:
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raise ansible.errors.AnsibleError(NO_INTERPRETER_MSG % (
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self._inv.module_name,
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))
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fragment = self._rewrite_interpreter(path)
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if arg:
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fragment += ' ' + arg
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is_python = path.startswith('python')
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return fragment, is_python
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def get_kwargs(self, **kwargs):
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interpreter_fragment, is_python = self._get_interpreter()
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return super(ScriptPlanner, self).get_kwargs(
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interpreter_fragment=interpreter_fragment,
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is_python=is_python,
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**kwargs
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)
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class JsonArgsPlanner(ScriptPlanner):
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"""
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Script that has its interpreter directive and the task arguments
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substituted into its source as a JSON string.
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"""
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runner_name = 'JsonArgsRunner'
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@classmethod
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def detect(cls, path, source):
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return ansible.executor.module_common.REPLACER_JSONARGS in source
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class WantJsonPlanner(ScriptPlanner):
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"""
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If a module has the string WANT_JSON in it anywhere, Ansible treats it as a
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non-native module that accepts a filename as its only command line
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parameter. The filename is for a temporary file containing a JSON string
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containing the module's parameters. The module needs to open the file, read
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and parse the parameters, operate on the data, and print its return data as
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a JSON encoded dictionary to stdout before exiting.
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These types of modules are self-contained entities. As of Ansible 2.1,
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Ansible only modifies them to change a shebang line if present.
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"""
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runner_name = 'WantJsonRunner'
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@classmethod
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def detect(cls, path, source):
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return b'WANT_JSON' in source
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class NewStylePlanner(ScriptPlanner):
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"""
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The Ansiballz framework differs from module replacer in that it uses real
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Python imports of things in ansible/module_utils instead of merely
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preprocessing the module.
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"""
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runner_name = 'NewStyleRunner'
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MARKER = re.compile(br'from ansible(?:_collections|\.module_utils)\.')
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@classmethod
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def detect(cls, path, source):
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return cls.MARKER.search(source) is not None
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def _get_interpreter(self):
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return None, None
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def get_push_files(self):
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return super(NewStylePlanner, self).get_push_files() + [
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mitogen.core.to_text(path)
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for fullname, path, is_pkg in self.get_module_map()['custom']
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]
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def get_module_deps(self):
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return self.get_module_map()['builtin']
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#: Module names appearing in this set always require forking, usually due
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#: to some terminal leakage that cannot be worked around in any sane
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#: manner.
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ALWAYS_FORK_MODULES = frozenset([
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'dnf', # issue #280; py-dnf/hawkey need therapy
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'firewalld', # issue #570: ansible module_utils caches dbus conn
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'ansible.legacy.dnf', # issue #776
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'ansible.builtin.dnf', # issue #832
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])
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def should_fork(self):
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"""
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In addition to asynchronous tasks, new-style modules should be forked
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if:
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* the user specifies mitogen_task_isolation=fork, or
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* the new-style module has a custom module search path, or
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* the module is known to leak like a sieve.
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"""
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return (
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super(NewStylePlanner, self).should_fork() or
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(self._inv.task_vars.get('mitogen_task_isolation') == 'fork') or
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(self._inv.module_name in self.ALWAYS_FORK_MODULES) or
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(len(self.get_module_map()['custom']) > 0)
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)
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def get_search_path(self):
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return tuple(
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path
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for path in ansible_mitogen.loaders.module_utils_loader._get_paths(
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subdirs=False
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)
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)
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_module_map = None
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def get_module_map(self):
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if self._module_map is None:
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binding = self._inv.connection.get_binding()
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|
|
self._module_map = mitogen.service.call(
|
||
|
|
call_context=binding.get_service_context(),
|
||
|
|
service_name='ansible_mitogen.services.ModuleDepService',
|
||
|
|
method_name='scan',
|
||
|
|
|
||
|
|
module_name='ansible_module_%s' % (self._inv.module_name,),
|
||
|
|
module_path=self._inv.module_path,
|
||
|
|
search_path=self.get_search_path(),
|
||
|
|
builtin_path=ansible.executor.module_common._MODULE_UTILS_PATH,
|
||
|
|
context=self._inv.connection.context,
|
||
|
|
)
|
||
|
|
return self._module_map
|
||
|
|
|
||
|
|
def get_kwargs(self):
|
||
|
|
return super(NewStylePlanner, self).get_kwargs(
|
||
|
|
module_map=self.get_module_map(),
|
||
|
|
py_module_name=py_modname_from_path(
|
||
|
|
self._inv.module_name,
|
||
|
|
self._inv.module_path,
|
||
|
|
),
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
class ReplacerPlanner(NewStylePlanner):
|
||
|
|
"""
|
||
|
|
The Module Replacer framework is the original framework implementing
|
||
|
|
new-style modules. It is essentially a preprocessor (like the C
|
||
|
|
Preprocessor for those familiar with that programming language). It does
|
||
|
|
straight substitutions of specific substring patterns in the module file.
|
||
|
|
There are two types of substitutions.
|
||
|
|
|
||
|
|
* Replacements that only happen in the module file. These are public
|
||
|
|
replacement strings that modules can utilize to get helpful boilerplate
|
||
|
|
or access to arguments.
|
||
|
|
|
||
|
|
"from ansible.module_utils.MOD_LIB_NAME import *" is replaced with the
|
||
|
|
contents of the ansible/module_utils/MOD_LIB_NAME.py. These should only
|
||
|
|
be used with new-style Python modules.
|
||
|
|
|
||
|
|
"#<<INCLUDE_ANSIBLE_MODULE_COMMON>>" is equivalent to
|
||
|
|
"from ansible.module_utils.basic import *" and should also only apply to
|
||
|
|
new-style Python modules.
|
||
|
|
|
||
|
|
"# POWERSHELL_COMMON" substitutes the contents of
|
||
|
|
"ansible/module_utils/powershell.ps1". It should only be used with
|
||
|
|
new-style Powershell modules.
|
||
|
|
"""
|
||
|
|
runner_name = 'ReplacerRunner'
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def detect(cls, path, source):
|
||
|
|
return ansible.executor.module_common.REPLACER in source
|
||
|
|
|
||
|
|
|
||
|
|
class OldStylePlanner(ScriptPlanner):
|
||
|
|
runner_name = 'OldStyleRunner'
|
||
|
|
|
||
|
|
@classmethod
|
||
|
|
def detect(cls, path, source):
|
||
|
|
# Everything else.
|
||
|
|
return True
|
||
|
|
|
||
|
|
|
||
|
|
_planners = [
|
||
|
|
BinaryPlanner,
|
||
|
|
# ReplacerPlanner,
|
||
|
|
NewStylePlanner,
|
||
|
|
JsonArgsPlanner,
|
||
|
|
WantJsonPlanner,
|
||
|
|
OldStylePlanner,
|
||
|
|
]
|
||
|
|
|
||
|
|
|
||
|
|
def py_modname_from_path(name, path):
|
||
|
|
"""
|
||
|
|
Fetch the logical name of a new-style module as it might appear in
|
||
|
|
:data:`sys.modules` of the target's Python interpreter.
|
||
|
|
|
||
|
|
* Since Ansible 2.9, modules appearing within a package have the original
|
||
|
|
package hierarchy approximated on the target, enabling relative imports
|
||
|
|
to function correctly. For example, "ansible.modules.system.setup".
|
||
|
|
"""
|
||
|
|
try:
|
||
|
|
return ansible.executor.module_common._get_ansible_module_fqn(path)
|
||
|
|
except AttributeError:
|
||
|
|
pass
|
||
|
|
except ValueError:
|
||
|
|
pass
|
||
|
|
|
||
|
|
return 'ansible.modules.' + name
|
||
|
|
|
||
|
|
|
||
|
|
def read_file(path):
|
||
|
|
fd = os.open(path, os.O_RDONLY)
|
||
|
|
try:
|
||
|
|
bits = []
|
||
|
|
chunk = True
|
||
|
|
while True:
|
||
|
|
chunk = os.read(fd, 65536)
|
||
|
|
if not chunk:
|
||
|
|
break
|
||
|
|
bits.append(chunk)
|
||
|
|
finally:
|
||
|
|
os.close(fd)
|
||
|
|
|
||
|
|
return mitogen.core.b('').join(bits)
|
||
|
|
|
||
|
|
|
||
|
|
def _propagate_deps(invocation, planner, context):
|
||
|
|
binding = invocation.connection.get_binding()
|
||
|
|
mitogen.service.call(
|
||
|
|
call_context=binding.get_service_context(),
|
||
|
|
service_name='mitogen.service.PushFileService',
|
||
|
|
method_name='propagate_paths_and_modules',
|
||
|
|
|
||
|
|
context=context,
|
||
|
|
paths=planner.get_push_files(),
|
||
|
|
# modules=planner.get_module_deps(), TODO
|
||
|
|
overridden_sources=invocation._overridden_sources,
|
||
|
|
# needs to be a list because can't unpickle() a set()
|
||
|
|
extra_sys_paths=list(invocation._extra_sys_paths),
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def _invoke_async_task(invocation, planner):
|
||
|
|
job_id = '%016x' % random.randint(0, 2**64)
|
||
|
|
context = invocation.connection.spawn_isolated_child()
|
||
|
|
_propagate_deps(invocation, planner, context)
|
||
|
|
|
||
|
|
with mitogen.core.Receiver(context.router) as started_recv:
|
||
|
|
call_recv = context.call_async(
|
||
|
|
ansible_mitogen.target.run_module_async,
|
||
|
|
job_id=job_id,
|
||
|
|
timeout_secs=invocation.timeout_secs,
|
||
|
|
started_sender=started_recv.to_sender(),
|
||
|
|
kwargs=planner.get_kwargs(),
|
||
|
|
)
|
||
|
|
|
||
|
|
# Wait for run_module_async() to crash, or for AsyncRunner to indicate
|
||
|
|
# the job file has been written.
|
||
|
|
for msg in mitogen.select.Select([started_recv, call_recv]):
|
||
|
|
if msg.receiver is call_recv:
|
||
|
|
# It can only be an exception.
|
||
|
|
raise msg.unpickle()
|
||
|
|
break
|
||
|
|
|
||
|
|
return {
|
||
|
|
'stdout': json.dumps({
|
||
|
|
# modules/utilities/logic/async_wrapper.py::_run_module().
|
||
|
|
'changed': True,
|
||
|
|
'started': 1,
|
||
|
|
'finished': 0,
|
||
|
|
'ansible_job_id': job_id,
|
||
|
|
})
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
def _invoke_isolated_task(invocation, planner):
|
||
|
|
context = invocation.connection.spawn_isolated_child()
|
||
|
|
_propagate_deps(invocation, planner, context)
|
||
|
|
try:
|
||
|
|
return context.call(
|
||
|
|
ansible_mitogen.target.run_module,
|
||
|
|
kwargs=planner.get_kwargs(),
|
||
|
|
)
|
||
|
|
finally:
|
||
|
|
context.shutdown()
|
||
|
|
|
||
|
|
|
||
|
|
def _get_planner(invocation, source):
|
||
|
|
for klass in _planners:
|
||
|
|
if klass.detect(invocation.module_path, source):
|
||
|
|
LOG.debug(
|
||
|
|
'%r accepted %r (filename %r)',
|
||
|
|
klass, invocation.module_name, invocation.module_path,
|
||
|
|
)
|
||
|
|
return klass
|
||
|
|
LOG.debug('%r rejected %r', klass, invocation.module_name)
|
||
|
|
raise ansible.errors.AnsibleError(NO_METHOD_MSG + repr(invocation))
|
||
|
|
|
||
|
|
|
||
|
|
def _fix_py35(invocation, module_source):
|
||
|
|
"""
|
||
|
|
super edge case with a relative import error in Python 3.5.1-3.5.3
|
||
|
|
in Ansible's setup module when using Mitogen
|
||
|
|
https://github.com/dw/mitogen/issues/672#issuecomment-636408833
|
||
|
|
We replace a relative import in the setup module with the actual full file path
|
||
|
|
This works in vanilla Ansible but not in Mitogen otherwise
|
||
|
|
"""
|
||
|
|
if invocation.module_name in {'ansible.builtin.setup', 'ansible.legacy.setup', 'setup'} and \
|
||
|
|
invocation.module_path not in invocation._overridden_sources:
|
||
|
|
# in-memory replacement of setup module's relative import
|
||
|
|
# would check for just python3.5 and run this then but we don't know the
|
||
|
|
# target python at this time yet
|
||
|
|
# NOTE: another ansible 2.10-specific fix: `from ..module_utils` used to be `from ...module_utils`
|
||
|
|
module_source = module_source.replace(
|
||
|
|
b"from ..module_utils.basic import AnsibleModule",
|
||
|
|
b"from ansible.module_utils.basic import AnsibleModule"
|
||
|
|
)
|
||
|
|
invocation._overridden_sources[invocation.module_path] = module_source
|
||
|
|
|
||
|
|
|
||
|
|
def _load_collections(invocation):
|
||
|
|
"""
|
||
|
|
Special loader that ensures that `ansible_collections` exist as a module path for import
|
||
|
|
Goes through all collection path possibilities and stores paths to installed collections
|
||
|
|
Stores them on the current invocation to later be passed to the master service
|
||
|
|
"""
|
||
|
|
for collection_path in ansible.collections.list.list_collection_dirs():
|
||
|
|
invocation._extra_sys_paths.add(collection_path.decode('utf-8'))
|
||
|
|
|
||
|
|
|
||
|
|
def invoke(invocation):
|
||
|
|
"""
|
||
|
|
Find a Planner subclass corresponding to `invocation` and use it to invoke
|
||
|
|
the module.
|
||
|
|
|
||
|
|
:param Invocation invocation:
|
||
|
|
:returns:
|
||
|
|
Module return dict.
|
||
|
|
:raises ansible.errors.AnsibleError:
|
||
|
|
Unrecognized/unsupported module type.
|
||
|
|
"""
|
||
|
|
path = ansible_mitogen.loaders.module_loader.find_plugin(
|
||
|
|
invocation.module_name,
|
||
|
|
'',
|
||
|
|
)
|
||
|
|
if path is None:
|
||
|
|
raise ansible.errors.AnsibleError(NO_MODULE_MSG % (
|
||
|
|
invocation.module_name,
|
||
|
|
))
|
||
|
|
|
||
|
|
invocation.module_path = mitogen.core.to_text(path)
|
||
|
|
if invocation.module_path not in _planner_by_path:
|
||
|
|
if 'ansible_collections' in invocation.module_path:
|
||
|
|
_load_collections(invocation)
|
||
|
|
|
||
|
|
module_source = invocation.get_module_source()
|
||
|
|
_fix_py35(invocation, module_source)
|
||
|
|
_planner_by_path[invocation.module_path] = _get_planner(
|
||
|
|
invocation,
|
||
|
|
module_source
|
||
|
|
)
|
||
|
|
|
||
|
|
planner = _planner_by_path[invocation.module_path](invocation)
|
||
|
|
if invocation.wrap_async:
|
||
|
|
response = _invoke_async_task(invocation, planner)
|
||
|
|
elif planner.should_fork():
|
||
|
|
response = _invoke_isolated_task(invocation, planner)
|
||
|
|
else:
|
||
|
|
_propagate_deps(invocation, planner, invocation.connection.context)
|
||
|
|
response = invocation.connection.get_chain().call(
|
||
|
|
ansible_mitogen.target.run_module,
|
||
|
|
kwargs=planner.get_kwargs(),
|
||
|
|
)
|
||
|
|
|
||
|
|
return invocation.action._postprocess_response(response)
|