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# 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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from __future__ import absolute_import
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import logging
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import os
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import shlex
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import sys
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import time
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import ansible.errors
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import ansible.plugins.connection
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import mitogen.unix
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from mitogen.utils import cast
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import ansible_mitogen.helpers
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from ansible_mitogen.services import ContextService
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LOG = logging.getLogger(__name__)
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class Connection(ansible.plugins.connection.ConnectionBase):
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#: mitogen.master.Router for this worker.
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router = None
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#: mitogen.master.Context representing the parent Context, which is
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#: presently always the master process.
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parent = None
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#: mitogen.master.Context used to communicate with the target user account.
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context = None
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#: Only sudo is supported for now.
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become_methods = ['sudo']
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#: Set by the constructor according to whichever connection type this
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#: connection should emulate. We emulate the original connection type to
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#: work around artificial limitations in e.g. the synchronize action, which
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#: hard-codes 'local' and 'ssh' as the only allowable connection types.
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transport = None
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#: Set to 'ansible_python_interpreter' by on_action_run().
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python_path = None
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#: Set to 'ansible_sudo_exe' by on_action_run().
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sudo_path = None
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#: Set to 'ansible_ssh_timeout' by on_action_run().
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connect_timeout = None
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def __init__(self, play_context, new_stdin, original_transport):
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assert 'MITOGEN_LISTENER_PATH' in os.environ, (
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'The "mitogen" connection plug-in may only be instantiated '
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'by the "mitogen" strategy plug-in.'
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)
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self.original_transport = original_transport
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self.transport = original_transport
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super(Connection, self).__init__(play_context, new_stdin)
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def on_action_run(self, task_vars):
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"""
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Invoked by ActionModuleMixin to indicate a new task is about to start
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executing. We use the opportunity to grab relevant bits from the
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task-specific data.
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"""
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self.connect_timeout = task_vars.get(
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'ansible_ssh_timeout',
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None
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)
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self.python_path = task_vars.get(
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'ansible_python_interpreter',
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'/usr/bin/python'
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)
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self.sudo_path = task_vars.get(
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'ansible_sudo_exe',
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'sudo'
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)
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@property
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def connected(self):
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return self.router is not None
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def _connect_local(self):
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"""
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Fetch a reference to the local() Context from ContextService in the
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master process.
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"""
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return mitogen.service.call(self.parent, ContextService.handle, cast({
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'method': 'local',
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}))
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def _connect_ssh(self):
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"""
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Fetch a reference to an SSH Context matching the play context from
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ContextService in the master process.
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"""
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return mitogen.service.call(
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self.parent,
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ContextService.handle,
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cast({
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'method': 'ssh',
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'hostname': self._play_context.remote_addr,
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'username': self._play_context.remote_user,
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'password': self._play_context.password,
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'port': self._play_context.port,
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'python_path': self.python_path,
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'identity_file': self._play_context.private_key_file,
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'ssh_path': self._play_context.ssh_executable,
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'connect_timeout': self.connect_timeout,
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'ssh_args': [
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term
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for s in (
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getattr(self._play_context, 'ssh_args', ''),
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getattr(self._play_context, 'ssh_common_args', ''),
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getattr(self._play_context, 'ssh_extra_args', '')
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)
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for term in shlex.split(s or '')
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]
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})
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)
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def _connect_sudo(self, via=None, python_path=None):
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"""
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Fetch a reference to a sudo Context matching the play context from
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ContextService in the master process.
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:param via:
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Parent Context of the sudo Context. For Ansible, this should always
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be a Context returned by _connect_ssh().
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"""
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return mitogen.service.call(self.parent, ContextService.handle, cast({
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'method': 'sudo',
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'username': self._play_context.become_user,
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'password': self._play_context.password,
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'python_path': python_path or self.python_path,
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'sudo_path': self.sudo_path,
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'via': via,
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'sudo_args': shlex.split(self._play_context.sudo_flags or
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self._play_context.become_flags or ''),
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}))
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def _connect(self):
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"""
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Establish a connection to the master process's UNIX listener socket,
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constructing a mitogen.master.Router to communicate with the master,
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and a mitogen.master.Context to represent it.
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Depending on the original transport we should emulate, trigger one of
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the _connect_*() service calls defined above to cause the master
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process to establish the real connection on our behalf, or return a
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reference to the existing one.
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"""
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if self.connected:
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return
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path = os.environ['MITOGEN_LISTENER_PATH']
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self.router, self.parent = mitogen.unix.connect(path)
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if self.original_transport == 'local':
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if not self._play_context.become:
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self.context = self._connect_local()
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else:
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self.context = self._connect_sudo(python_path=sys.executable)
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else:
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self.host = self._connect_ssh()
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if not self._play_context.become:
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self.context = self.host
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else:
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self.context = self._connect_sudo(via=self.host)
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def close(self):
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"""
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Arrange for the mitogen.master.Router running in the worker to
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gracefully shut down, and wait for shutdown to complete. Safe to call
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multiple times.
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"""
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if self.router:
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self.router.broker.shutdown()
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self.router.broker.join()
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self.router = None
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def call_async(self, func, *args, **kwargs):
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"""
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Start a function call to the target.
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:returns:
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mitogen.core.Receiver that receives the function call result.
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"""
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self._connect()
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return self.context.call_async(func, *args, **kwargs)
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def call(self, func, *args, **kwargs):
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"""
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Start and wait for completion of a function call in the target.
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:raises mitogen.core.CallError:
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The function call failed.
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:returns:
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Function return value.
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"""
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t0 = time.time()
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try:
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return self.call_async(func, *args, **kwargs).get().unpickle()
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finally:
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LOG.debug('Call %s%r took %d ms', func.func_name, args,
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1000 * (time.time() - t0))
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def exec_command(self, cmd, in_data='', sudoable=True):
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"""
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Implement exec_command() by calling the corresponding
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ansible_mitogen.helpers function in the target.
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:param str cmd:
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Shell command to execute.
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:param bytes in_data:
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Data to supply on ``stdin`` of the process.
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:returns:
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(return code, stdout bytes, stderr bytes)
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"""
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return self.call(ansible_mitogen.helpers.exec_command,
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cast(cmd), cast(in_data))
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def fetch_file(self, in_path, out_path):
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"""
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Implement fetch_file() by calling the corresponding
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ansible_mitogen.helpers function in the target.
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:param str in_path:
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Remote filesystem path to read.
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:param str out_path:
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Local filesystem path to write.
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"""
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output = self.call(ansible_mitogen.helpers.read_path,
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cast(in_path))
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ansible_mitogen.helpers.write_path(out_path, output)
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def put_file(self, in_path, out_path):
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"""
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Implement put_file() by caling the corresponding
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ansible_mitogen.helpers function in the target.
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:param str in_path:
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Local filesystem path to read.
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:param str out_path:
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Remote filesystem path to write.
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"""
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self.call(ansible_mitogen.helpers.write_path, cast(out_path),
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ansible_mitogen.helpers.read_path(in_path))
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