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635 lines
22 KiB
Python
635 lines
22 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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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 stat
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import time
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import jinja2.runtime
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import ansible.constants as C
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import ansible.errors
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import ansible.plugins.connection
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import ansible.utils.shlex
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import mitogen.unix
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import mitogen.utils
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import ansible_mitogen.target
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import ansible_mitogen.process
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import ansible_mitogen.services
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LOG = logging.getLogger(__name__)
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def _connect_local(spec):
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return {
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'method': 'local',
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'kwargs': {
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'python_path': spec['python_path'],
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}
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}
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def wrap_or_none(klass, value):
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if value is not None:
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return klass(value)
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def _connect_ssh(spec):
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if C.HOST_KEY_CHECKING:
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check_host_keys = 'enforce'
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else:
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check_host_keys = 'ignore'
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return {
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'method': 'ssh',
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'kwargs': {
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'check_host_keys': check_host_keys,
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'hostname': spec['remote_addr'],
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'username': spec['remote_user'],
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'password': wrap_or_none(mitogen.core.Secret, spec['password']),
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'port': spec['port'],
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'python_path': spec['python_path'],
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'identity_file': spec['private_key_file'],
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'ssh_path': spec['ssh_executable'],
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'connect_timeout': spec['ansible_ssh_timeout'],
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'ssh_args': spec['ssh_args'],
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}
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}
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def _connect_docker(spec):
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return {
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'method': 'docker',
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'kwargs': {
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'username': spec['remote_user'],
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'container': spec['remote_addr'],
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'python_path': spec['python_path'],
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'connect_timeout': spec['ansible_ssh_timeout'] or spec['timeout'],
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}
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}
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def _connect_jail(spec):
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return {
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'method': 'jail',
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'kwargs': {
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'username': spec['remote_user'],
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'container': spec['remote_addr'],
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'python_path': spec['python_path'],
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'connect_timeout': spec['ansible_ssh_timeout'] or spec['timeout'],
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}
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}
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def _connect_lxc(spec):
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return {
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'method': 'lxc',
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'kwargs': {
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'container': spec['remote_addr'],
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'python_path': spec['python_path'],
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'connect_timeout': spec['ansible_ssh_timeout'] or spec['timeout'],
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}
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}
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def _connect_machinectl(spec):
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return _connect_setns(dict(spec, mitogen_kind='machinectl'))
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def _connect_setns(spec):
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return {
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'method': 'setns',
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'kwargs': {
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'container': spec['remote_addr'],
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'username': spec['remote_user'],
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'python_path': spec['python_path'],
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'kind': spec['mitogen_kind'],
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'docker_path': spec['mitogen_docker_path'],
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'lxc_info_path': spec['mitogen_lxc_info_path'],
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'machinectl_path': spec['mitogen_machinectl_path'],
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}
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}
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def _connect_su(spec):
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return {
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'method': 'su',
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'enable_lru': True,
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'kwargs': {
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'username': spec['become_user'],
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'password': wrap_or_none(mitogen.core.Secret, spec['become_pass']),
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'python_path': spec['python_path'],
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'su_path': spec['become_exe'],
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'connect_timeout': spec['timeout'],
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}
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}
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def _connect_sudo(spec):
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return {
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'method': 'sudo',
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'enable_lru': True,
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'kwargs': {
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'username': spec['become_user'],
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'password': wrap_or_none(mitogen.core.Secret, spec['become_pass']),
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'python_path': spec['python_path'],
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'sudo_path': spec['become_exe'],
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'connect_timeout': spec['timeout'],
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'sudo_args': spec['sudo_args'],
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}
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}
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def _connect_mitogen_su(spec):
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# su as a first-class proxied connection, not a become method.
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return {
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'method': 'su',
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'kwargs': {
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'username': spec['remote_user'],
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'password': wrap_or_none(mitogen.core.Secret, spec['password']),
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'python_path': spec['python_path'],
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'su_path': spec['become_exe'],
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'connect_timeout': spec['timeout'],
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}
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}
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def _connect_mitogen_sudo(spec):
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# sudo as a first-class proxied connection, not a become method.
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return {
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'method': 'sudo',
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'kwargs': {
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'username': spec['remote_user'],
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'password': wrap_or_none(mitogen.core.Secret, spec['password']),
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'python_path': spec['python_path'],
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'sudo_path': spec['become_exe'],
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'connect_timeout': spec['timeout'],
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'sudo_args': spec['sudo_args'],
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}
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}
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CONNECTION_METHOD = {
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'docker': _connect_docker,
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'jail': _connect_jail,
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'local': _connect_local,
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'lxc': _connect_lxc,
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'lxd': _connect_lxc,
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'machinectl': _connect_machinectl,
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'setns': _connect_setns,
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'ssh': _connect_ssh,
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'su': _connect_su,
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'sudo': _connect_sudo,
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'mitogen_su': _connect_mitogen_su,
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'mitogen_sudo': _connect_mitogen_sudo,
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}
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def config_from_play_context(transport, inventory_name, connection):
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"""
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Return a dict representing all important connection configuration, allowing
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the same functions to work regardless of whether configuration came from
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play_context (direct connection) or host vars (mitogen_via=).
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"""
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return {
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'transport': transport,
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'inventory_name': inventory_name,
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'remote_addr': connection._play_context.remote_addr,
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'remote_user': connection._play_context.remote_user,
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'become': connection._play_context.become,
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'become_method': connection._play_context.become_method,
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'become_user': connection._play_context.become_user,
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'become_pass': connection._play_context.become_pass,
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'password': connection._play_context.password,
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'port': connection._play_context.port,
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'python_path': connection.python_path,
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'private_key_file': connection._play_context.private_key_file,
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'ssh_executable': connection._play_context.ssh_executable,
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'timeout': connection._play_context.timeout,
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'ansible_ssh_timeout': connection.ansible_ssh_timeout,
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'ssh_args': [
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term
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for s in (
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getattr(connection._play_context, 'ssh_args', ''),
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getattr(connection._play_context, 'ssh_common_args', ''),
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getattr(connection._play_context, 'ssh_extra_args', '')
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)
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for term in ansible.utils.shlex.shlex_split(s or '')
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],
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'become_exe': connection._play_context.become_exe,
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'sudo_args': [
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term
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for s in (
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connection._play_context.sudo_flags,
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connection._play_context.become_flags
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)
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for term in ansible.utils.shlex.shlex_split(s or '')
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],
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'mitogen_via': connection.mitogen_via,
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'mitogen_kind': connection.mitogen_kind,
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'mitogen_docker_path': connection.mitogen_docker_path,
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'mitogen_lxc_info_path': connection.mitogen_lxc_info_path,
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'mitogen_machinectl_path': connection.mitogen_machinectl_path,
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}
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def config_from_hostvars(transport, inventory_name, connection,
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hostvars, become_user):
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"""
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Override config_from_play_context() to take equivalent information from
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host vars.
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"""
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config = config_from_play_context(transport, inventory_name, connection)
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hostvars = dict(hostvars)
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return dict(config, **{
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'remote_addr': hostvars.get('ansible_hostname', inventory_name),
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'become': bool(become_user),
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'become_user': become_user,
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'become_pass': None,
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'remote_user': hostvars.get('ansible_user'), # TODO
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'password': (hostvars.get('ansible_ssh_pass') or
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hostvars.get('ansible_password')),
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'port': hostvars.get('ansible_port'),
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'python_path': hostvars.get('ansible_python_interpreter'),
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'private_key_file': (hostvars.get('ansible_ssh_private_key_file') or
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hostvars.get('ansible_private_key_file')),
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'mitogen_via': hostvars.get('mitogen_via'),
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'mitogen_kind': hostvars.get('mitogen_kind'),
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'mitogen_docker_path': hostvars.get('mitogen_docker_path'),
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'mitogen_lxc_info_path': hostvars.get('mitogen_lxc_info_path'),
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'mitogen_machinectl_path': hostvars.get('mitogen_machinctl_path'),
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})
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class Connection(ansible.plugins.connection.ConnectionBase):
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#: mitogen.master.Broker for this worker.
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broker = None
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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 connection multiplexer process.
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parent = None
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#: mitogen.master.Context connected to the target user account on the
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#: target machine (i.e. via sudo).
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context = None
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#: mitogen.master.Context connected to the fork parent process in the
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#: target user account.
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fork_context = None
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#: Only sudo and su are supported for now.
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become_methods = ['sudo', 'su']
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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_ssh_timeout' by on_action_run().
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ansible_ssh_timeout = None
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#: Set to 'mitogen_via' by on_action_run().
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mitogen_via = None
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#: Set to 'mitogen_kind' by on_action_run().
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mitogen_kind = None
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#: Set to 'mitogen_docker_path' by on_action_run().
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mitogen_docker_path = None
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#: Set to 'mitogen_lxc_info_path' by on_action_run().
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mitogen_lxc_info_path = None
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#: Set to 'mitogen_lxc_info_path' by on_action_run().
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mitogen_machinectl_path = None
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#: Set to 'inventory_hostname' by on_action_run().
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inventory_hostname = None
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#: Set to 'hostvars' by on_action_run()
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host_vars = None
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#: Set after connection to the target context's home directory.
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home_dir = None
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def __init__(self, play_context, new_stdin, **kwargs):
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assert ansible_mitogen.process.MuxProcess.unix_listener_path, (
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'Mitogen connection types may only be instantiated '
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'while the "mitogen" strategy is active.'
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)
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super(Connection, self).__init__(play_context, new_stdin)
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def __del__(self):
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"""
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Ansible cannot be trusted to always call close() e.g. the synchronize
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action constructs a local connection like this. So provide a destructor
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in the hopes of catching these cases.
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"""
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# https://github.com/dw/mitogen/issues/140
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self.close()
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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.ansible_ssh_timeout = task_vars.get('ansible_ssh_timeout',
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C.DEFAULT_TIMEOUT)
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self.python_path = task_vars.get('ansible_python_interpreter',
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'/usr/bin/python')
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self.mitogen_via = task_vars.get('mitogen_via')
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self.mitogen_kind = task_vars.get('mitogen_kind')
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self.mitogen_docker_path = task_vars.get('mitogen_docker_path')
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self.mitogen_lxc_info_path = task_vars.get('mitogen_lxc_info_path')
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self.mitogen_machinectl_path = task_vars.get('mitogen_machinectl_path')
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self.inventory_hostname = task_vars['inventory_hostname']
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self.host_vars = task_vars['hostvars']
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self.close(new_task=True)
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@property
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def homedir(self):
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self._connect()
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return self.home_dir
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@property
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def connected(self):
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return self.context is not None
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def _config_from_via(self, via_spec):
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become_user, _, inventory_name = via_spec.rpartition('@')
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via_vars = self.host_vars[inventory_name]
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if isinstance(via_vars, jinja2.runtime.Undefined):
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raise ansible.errors.AnsibleConnectionFailure(
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self.unknown_via_msg % (
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self.mitogen_via,
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inventory_name,
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)
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)
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return config_from_hostvars(
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transport=via_vars.get('ansible_connection', 'ssh'),
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inventory_name=inventory_name,
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connection=self,
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hostvars=via_vars,
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become_user=become_user or None,
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)
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unknown_via_msg = 'mitogen_via=%s of %s specifies an unknown hostname'
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via_cycle_msg = 'mitogen_via=%s of %s creates a cycle (%s)'
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def _stack_from_config(self, config, stack=(), seen_names=()):
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if config['inventory_name'] in seen_names:
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raise ansible.errors.AnsibleConnectionFailure(
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self.via_cycle_msg % (
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config['mitogen_via'],
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config['inventory_name'],
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' -> '.join(reversed(
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seen_names + (config['inventory_name'],)
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)),
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)
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)
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if config['mitogen_via']:
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stack, seen_names = self._stack_from_config(
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self._config_from_via(config['mitogen_via']),
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stack=stack,
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seen_names=seen_names + (config['inventory_name'],)
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)
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stack += (CONNECTION_METHOD[config['transport']](config),)
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if config['become']:
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stack += (CONNECTION_METHOD[config['become_method']](config),)
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return stack, seen_names
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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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if not self.broker:
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self.broker = mitogen.master.Broker()
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self.router, self.parent = mitogen.unix.connect(
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path=ansible_mitogen.process.MuxProcess.unix_listener_path,
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broker=self.broker,
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)
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stack, _ = self._stack_from_config(
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config_from_play_context(
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transport=self.transport,
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inventory_name=self.inventory_hostname,
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connection=self
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)
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)
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dct = self.parent.call_service(
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service_name='ansible_mitogen.services.ContextService',
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method_name='get',
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stack=mitogen.utils.cast(list(stack)),
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)
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if dct['msg']:
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if dct['method_name'] in self.become_methods:
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raise ansible.errors.AnsibleModuleError(dct['msg'])
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raise ansible.errors.AnsibleConnectionFailure(dct['msg'])
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self.context = dct['context']
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self.fork_context = dct['init_child_result']['fork_context']
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self.home_dir = dct['init_child_result']['home_dir']
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def close(self, new_task=False):
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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.context:
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self.parent.call_service(
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service_name='ansible_mitogen.services.ContextService',
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method_name='put',
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context=self.context
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)
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self.context = None
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if self.broker and not new_task:
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self.broker.shutdown()
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self.broker.join()
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self.broker = None
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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:
|
|
The function call failed.
|
|
:returns:
|
|
Function return value.
|
|
"""
|
|
t0 = time.time()
|
|
try:
|
|
return self.call_async(func, *args, **kwargs).get().unpickle()
|
|
finally:
|
|
LOG.debug('Call took %d ms: %s%r', 1000 * (time.time() - t0),
|
|
func.func_name, args)
|
|
|
|
def create_fork_child(self):
|
|
"""
|
|
Fork a new child off the target context. The actual fork occurs from
|
|
the 'virginal fork parent', which does not any Ansible modules prior to
|
|
fork, to avoid conflicts resulting from custom module_utils paths.
|
|
|
|
:returns:
|
|
mitogen.core.Context of the new child.
|
|
"""
|
|
return self.call(ansible_mitogen.target.create_fork_child)
|
|
|
|
def exec_command(self, cmd, in_data='', sudoable=True, mitogen_chdir=None):
|
|
"""
|
|
Implement exec_command() by calling the corresponding
|
|
ansible_mitogen.target function in the target.
|
|
|
|
:param str cmd:
|
|
Shell command to execute.
|
|
:param bytes in_data:
|
|
Data to supply on ``stdin`` of the process.
|
|
:returns:
|
|
(return code, stdout bytes, stderr bytes)
|
|
"""
|
|
emulate_tty = (not in_data and sudoable)
|
|
rc, stdout, stderr = self.call(
|
|
ansible_mitogen.target.exec_command,
|
|
cmd=mitogen.utils.cast(cmd),
|
|
in_data=mitogen.utils.cast(in_data),
|
|
chdir=mitogen_chdir,
|
|
emulate_tty=emulate_tty,
|
|
)
|
|
|
|
stderr += 'Shared connection to %s closed.%s' % (
|
|
self._play_context.remote_addr,
|
|
('\r\n' if emulate_tty else '\n'),
|
|
)
|
|
return rc, stdout, stderr
|
|
|
|
def fetch_file(self, in_path, out_path):
|
|
"""
|
|
Implement fetch_file() by calling the corresponding
|
|
ansible_mitogen.target function in the target.
|
|
|
|
:param str in_path:
|
|
Remote filesystem path to read.
|
|
:param str out_path:
|
|
Local filesystem path to write.
|
|
"""
|
|
output = self.call(ansible_mitogen.target.read_path,
|
|
mitogen.utils.cast(in_path))
|
|
ansible_mitogen.target.write_path(out_path, output)
|
|
|
|
def put_data(self, out_path, data, mode=None, utimes=None):
|
|
"""
|
|
Implement put_file() by caling the corresponding
|
|
ansible_mitogen.target function in the target.
|
|
|
|
:param str out_path:
|
|
Remote filesystem path to write.
|
|
:param byte data:
|
|
File contents to put.
|
|
"""
|
|
self.call(ansible_mitogen.target.write_path,
|
|
mitogen.utils.cast(out_path),
|
|
mitogen.core.Blob(data),
|
|
mode=mode,
|
|
utimes=utimes)
|
|
|
|
def put_file(self, in_path, out_path):
|
|
"""
|
|
Implement put_file() by streamily transferring the file via
|
|
FileService.
|
|
|
|
:param str in_path:
|
|
Local filesystem path to read.
|
|
:param str out_path:
|
|
Remote filesystem path to write.
|
|
"""
|
|
st = os.stat(in_path)
|
|
if not stat.S_ISREG(st.st_mode):
|
|
raise IOError('%r is not a regular file.' % (in_path,))
|
|
|
|
# If the file is sufficiently small, just ship it in the argument list
|
|
# rather than introducing an extra RTT for the child to request it from
|
|
# FileService.
|
|
if st.st_size <= 32768:
|
|
fp = open(in_path, 'rb')
|
|
try:
|
|
s = fp.read(32769)
|
|
finally:
|
|
fp.close()
|
|
|
|
# Ensure file was not growing during call.
|
|
if len(s) == st.st_size:
|
|
return self.put_data(out_path, s, mode=st.st_mode,
|
|
utimes=(st.st_atime, st.st_mtime))
|
|
|
|
self.parent.call_service(
|
|
service_name='mitogen.service.FileService',
|
|
method_name='register',
|
|
path=mitogen.utils.cast(in_path)
|
|
)
|
|
self.call(
|
|
ansible_mitogen.target.transfer_file,
|
|
context=self.parent,
|
|
in_path=in_path,
|
|
out_path=out_path
|
|
)
|