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95 lines
3.5 KiB
Python
95 lines
3.5 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 threading
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import os
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import mitogen
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import mitogen.core
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import mitogen.master
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import mitogen.service
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import mitogen.unix
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import mitogen.utils
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import ansible_mitogen.logging
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import ansible_mitogen.services
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class State(object):
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"""
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Process-global state that should persist across playbook runs.
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"""
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#: ProcessState singleton.
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_instance = None
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@classmethod
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def instance(cls):
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"""
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Fetch the ProcessState singleton, constructing it as necessary.
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"""
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if cls._instance is None:
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cls._instance = cls()
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return cls._instance
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def __init__(self):
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ansible_mitogen.logging.setup()
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self._setup_master()
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self._setup_services()
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def _setup_master(self):
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"""
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Construct a Router, Broker, and mitogen.unix listener
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"""
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self.router = mitogen.master.Router()
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self.router.responder.whitelist_prefix('ansible')
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self.router.responder.whitelist_prefix('ansible_mitogen')
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mitogen.core.listen(self.router.broker, 'shutdown', self.on_broker_shutdown)
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self.listener = mitogen.unix.Listener(self.router)
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os.environ['MITOGEN_LISTENER_PATH'] = self.listener.path
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if 'MITOGEN_ROUTER_DEBUG' in os.environ:
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self.router.enable_debug()
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def _setup_services(self):
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"""
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Construct a ContextService and a thread to service requests for it
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arriving from worker processes.
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"""
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self.service = ansible_mitogen.services.ContextService(self.router)
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self.service_thread = threading.Thread(target=self.service.run)
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self.service_thread.start()
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def on_broker_shutdown(self):
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"""
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Respond to the Router shutdown (indirectly triggered through exit of
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the main thread) by unlinking the listening socket. Ideally this would
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happen explicitly, but Ansible provides no hook to allow it.
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"""
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os.unlink(self.listener.path)
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self.service_thread.join(timeout=10)
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