368 lines
13 KiB
Python
368 lines
13 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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import json
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import logging
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import os
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from ansible.executor import module_common
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import ansible.errors
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try:
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from ansible.plugins.loader import module_loader
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except ImportError: # Ansible <2.4
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from ansible.plugins import module_loader
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import mitogen
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import mitogen.service
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import ansible_mitogen.target
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import ansible_mitogen.services
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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('#!'):
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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('\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 bits[0], None
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return bits[0], 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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remote_tmp, task_vars, templar, env, wrap_async):
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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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#: Value of 'remote_tmp' parameter, to allow target to create temporary
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#: files in correct location.
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self.remote_tmp = remote_tmp
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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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#: 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 detect(self, invocation):
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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 get_should_fork(self, invocation):
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"""
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Asynchronous tasks must always be forked.
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"""
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return invocation.wrap_async
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def plan(self, invocation, **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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kwargs.setdefault('emulate_tty', True)
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kwargs.setdefault('service_context', invocation.connection.parent)
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kwargs.setdefault('should_fork', self.get_should_fork(invocation))
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kwargs.setdefault('wrap_async', invocation.wrap_async)
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return kwargs
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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, invocation):
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return module_common._is_binary(invocation.module_source)
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def plan(self, invocation, **kwargs):
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invocation.connection._connect()
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mitogen.service.call(
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context=invocation.connection.parent,
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handle=ansible_mitogen.services.FileService.handle,
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method='register',
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kwargs={
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'path': invocation.module_path
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}
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)
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return super(BinaryPlanner, self).plan(
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invocation=invocation,
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runner_name=self.runner_name,
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module=invocation.module_name,
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path=invocation.module_path,
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args=invocation.module_args,
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env=invocation.env,
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remote_tmp=invocation.remote_tmp,
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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, invocation, interpreter):
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key = u'ansible_%s_interpreter' % os.path.basename(interpreter).strip()
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try:
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template = invocation.task_vars[key].strip()
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return invocation.templar.template(template)
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except KeyError:
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return interpreter
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def plan(self, invocation, **kwargs):
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interpreter, arg = parse_script_interpreter(invocation.module_source)
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if interpreter is None:
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raise ansible.errors.AnsibleError(NO_INTERPRETER_MSG % (
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invocation.module_name,
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))
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return super(ScriptPlanner, self).plan(
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invocation=invocation,
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interpreter_arg=arg,
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interpreter=self._rewrite_interpreter(
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interpreter=interpreter,
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invocation=invocation
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),
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**kwargs
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)
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class ReplacerPlanner(BinaryPlanner):
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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, invocation):
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return module_common.REPLACER in invocation.module_source
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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, invocation):
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return module_common.REPLACER_JSONARGS in invocation.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, invocation):
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return 'WANT_JSON' in invocation.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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def get_should_fork(self, invocation):
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"""
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In addition to asynchronous tasks, new-style modules should be forked
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if mitogen_task_isolation=fork.
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"""
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return (
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super(NewStylePlanner, self).get_should_fork(invocation) or
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(invocation.task_vars.get('mitogen_task_isolation') == 'fork')
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)
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def detect(self, invocation):
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return 'from ansible.module_utils.' in invocation.module_source
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class ReplacerPlanner(NewStylePlanner):
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runner_name = 'ReplacerRunner'
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def detect(self, invocation):
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return module_common.REPLACER in invocation.module_source
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class OldStylePlanner(ScriptPlanner):
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runner_name = 'OldStyleRunner'
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def detect(self, invocation):
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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 = 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 path, source
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def invoke(invocation):
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"""
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Find a suitable Planner that knows how to run `invocation`.
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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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for klass in _planners:
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planner = klass()
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if planner.detect(invocation):
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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 invocation.action._postprocess_response(
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invocation.connection.call(
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ansible_mitogen.target.run_module,
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planner.plan(invocation),
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)
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)
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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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