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484 lines
16 KiB
Python
484 lines
16 KiB
Python
# Copyright 2017, 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
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from __future__ import unicode_literals
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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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from ansible.executor import module_common
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import ansible.errors
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import ansible.module_utils
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import mitogen.core
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import ansible_mitogen.loaders
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import ansible_mitogen.target
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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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def parse_script_interpreter(source):
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"""
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Extract the script interpreter and its sole argument from the module
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source code.
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:returns:
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Tuple of `(interpreter, arg)`, where `intepreter` is the script
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interpreter and `arg` is its sole argument if present, otherwise
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:py:data:`None`.
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"""
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# Linux requires first 2 bytes with no whitespace, pretty sure it's the
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# same everywhere. See binfmt_script.c.
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if not source.startswith(b'#!'):
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return None, None
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# Find terminating newline. Assume last byte of binprm_buf if absent.
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nl = source.find(b'\n', 0, 128)
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if nl == -1:
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nl = min(128, len(source))
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# Split once on the first run of whitespace. If no whitespace exists,
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# bits just contains the interpreter filename.
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bits = source[2:nl].strip().split(None, 1)
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if len(bits) == 1:
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return mitogen.core.to_text(bits[0]), None
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return mitogen.core.to_text(bits[0]), mitogen.core.to_text(bits[1])
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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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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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def detect(self):
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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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new = dict((mitogen.core.UnicodeType(k), kwargs[k])
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for k in kwargs)
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new.setdefault('emulate_tty', True)
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new.setdefault('service_context', self._inv.connection.parent)
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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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def detect(self):
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return module_common._is_binary(self._inv.module_source)
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def get_push_files(self):
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return [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 _get_interpreter(self):
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interpreter, arg = parse_script_interpreter(
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self._inv.module_source
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)
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if interpreter 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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key = u'ansible_%s_interpreter' % os.path.basename(interpreter).strip()
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try:
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template = self._inv.task_vars[key].strip()
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return self._inv.templar.template(template), arg
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except KeyError:
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return interpreter, arg
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def get_kwargs(self, **kwargs):
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interpreter, arg = self._get_interpreter()
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return super(ScriptPlanner, self).get_kwargs(
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interpreter_arg=arg,
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interpreter=interpreter,
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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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def detect(self):
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return module_common.REPLACER_JSONARGS in self._inv.module_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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def detect(self):
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return b'WANT_JSON' in self._inv.module_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 = b'from ansible.module_utils.'
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def detect(self):
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return self.marker in self._inv.module_source
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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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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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])
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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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if os.path.isdir(path)
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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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self._module_map = self._inv.connection.parent.call_service(
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service_name='ansible_mitogen.services.ModuleDepService',
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method_name='scan',
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module_name='ansible_module_%s' % (self._inv.module_name,),
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module_path=self._inv.module_path,
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search_path=self.get_search_path(),
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builtin_path=module_common._MODULE_UTILS_PATH,
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context=self._inv.connection.context,
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)
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return self._module_map
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def get_kwargs(self):
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return super(NewStylePlanner, self).get_kwargs(
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module_map=self.get_module_map(),
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)
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class ReplacerPlanner(NewStylePlanner):
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"""
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The Module Replacer framework is the original framework implementing
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new-style modules. It is essentially a preprocessor (like the C
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Preprocessor for those familiar with that programming language). It does
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straight substitutions of specific substring patterns in the module file.
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There are two types of substitutions.
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* Replacements that only happen in the module file. These are public
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replacement strings that modules can utilize to get helpful boilerplate
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or access to arguments.
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"from ansible.module_utils.MOD_LIB_NAME import *" is replaced with the
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contents of the ansible/module_utils/MOD_LIB_NAME.py. These should only
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be used with new-style Python modules.
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"#<<INCLUDE_ANSIBLE_MODULE_COMMON>>" is equivalent to
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"from ansible.module_utils.basic import *" and should also only apply to
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new-style Python modules.
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"# POWERSHELL_COMMON" substitutes the contents of
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"ansible/module_utils/powershell.ps1". It should only be used with
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new-style Powershell modules.
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"""
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runner_name = 'ReplacerRunner'
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def detect(self):
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return module_common.REPLACER in self._inv.module_source
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class OldStylePlanner(ScriptPlanner):
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runner_name = 'OldStyleRunner'
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def detect(self):
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# Everything else.
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return True
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_planners = [
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BinaryPlanner,
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# ReplacerPlanner,
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NewStylePlanner,
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JsonArgsPlanner,
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WantJsonPlanner,
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OldStylePlanner,
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]
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def get_module_data(name):
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path = ansible_mitogen.loaders.module_loader.find_plugin(name, '')
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with open(path, 'rb') as fp:
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source = fp.read()
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return mitogen.core.to_text(path), source
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def _propagate_deps(invocation, planner, context):
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invocation.connection.parent.call_service(
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service_name='mitogen.service.PushFileService',
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method_name='propagate_paths_and_modules',
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context=context,
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paths=planner.get_push_files(),
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modules=planner.get_module_deps(),
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)
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def _invoke_async_task(invocation, planner):
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job_id = '%016x' % random.randint(0, 2**64)
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context = invocation.connection.create_fork_child()
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_propagate_deps(invocation, planner, context)
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context.call_no_reply(
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ansible_mitogen.target.run_module_async,
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job_id=job_id,
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timeout_secs=invocation.timeout_secs,
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kwargs=planner.get_kwargs(),
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)
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return {
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'stdout': json.dumps({
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# modules/utilities/logic/async_wrapper.py::_run_module().
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'changed': True,
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'started': 1,
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'finished': 0,
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'ansible_job_id': job_id,
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})
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}
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def _invoke_forked_task(invocation, planner):
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context = invocation.connection.create_fork_child()
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_propagate_deps(invocation, planner, context)
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try:
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return context.call(
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ansible_mitogen.target.run_module,
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kwargs=planner.get_kwargs(),
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)
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finally:
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context.shutdown()
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def _get_planner(invocation):
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for klass in _planners:
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planner = klass(invocation)
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if planner.detect():
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LOG.debug('%r accepted %r (filename %r)', planner,
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invocation.module_name, invocation.module_path)
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return planner
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LOG.debug('%r rejected %r', planner, invocation.module_name)
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raise ansible.errors.AnsibleError(NO_METHOD_MSG + repr(invocation))
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def invoke(invocation):
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"""
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Find a Planner subclass corresnding to `invocation` and use it to invoke
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the module.
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:param Invocation invocation:
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:returns:
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Module return dict.
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:raises ansible.errors.AnsibleError:
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Unrecognized/unsupported module type.
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"""
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(invocation.module_path,
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invocation.module_source) = get_module_data(invocation.module_name)
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planner = _get_planner(invocation)
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if invocation.wrap_async:
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response = _invoke_async_task(invocation, planner)
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elif planner.should_fork():
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response = _invoke_forked_task(invocation, planner)
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else:
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_propagate_deps(invocation, planner, invocation.connection.context)
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response = invocation.connection.call(
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ansible_mitogen.target.run_module,
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kwargs=planner.get_kwargs(),
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)
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return invocation.action._postprocess_response(response)
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