mirror of
https://github.com/xcat2/confluent.git
synced 2026-09-05 12:37:56 +00:00
Markus Hilger
a53351a730
virEventRunDefaultImpl waits for an event that an idle domain need not produce, so the thread could outlive a deactivation that reported success, and every later activation was refused while it did. Registering a timeout is what makes it return: measured, a thread with nothing registered was still running four seconds after being asked to stop, and with a half second timer it came out at once.
206 lines
7.7 KiB
Python
Executable File
206 lines
7.7 KiB
Python
Executable File
# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""This is a simple, but working proof of concept of using aiohmi.ipmi.bmc to
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control a VM
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"""
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import argparse
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import asyncio
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import sys
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import threading
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import libvirt
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import aiohmi.ipmi.bmc as bmc
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def lifecycle_callback(connection, domain, event, detail, console):
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console.state = console.domain.state(0)
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def error_handler(unused, error):
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if (error[0] == libvirt.VIR_ERR_RPC
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and error[1] == libvirt.VIR_FROM_STREAMS):
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return
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def stream_callback(stream, events, console):
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try:
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data = console.stream.recv(1024)
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except Exception:
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return
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if console.sol and console.asyncloop:
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# libvirt calls this from its own event thread, and asyncio objects
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# are not thread safe, so hand the send to the loop that owns them.
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asyncio.run_coroutine_threadsafe(console.sol.send_data(data),
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console.asyncloop)
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class LibvirtBmc(bmc.Bmc):
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"""A class to provide an IPMI interface to the VirtualBox APIs."""
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def __init__(self, authdata, hypervisor, domain, port):
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super(LibvirtBmc, self).__init__(authdata, port)
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# Rely on libvirt to throw on bad data
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self.conn = libvirt.open(hypervisor)
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self.name = domain
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self.domain = self.conn.lookupByName(domain)
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self.state = self.domain.state(0)
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self.stream = None
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self.asyncloop = None
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self.run_console = False
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self.conn.domainEventRegister(lifecycle_callback, self)
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self.sol_thread = None
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def cold_reset(self):
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# Reset of the BMC, not managed system, here we will exit the demo
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print('shutting down in response to BMC cold reset request')
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sys.exit(0)
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def get_power_state(self):
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if self.domain.isActive():
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return 'on'
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else:
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return 'off'
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def power_off(self):
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if not self.domain.isActive():
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return 0xd5 # Not valid in this state
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self.domain.destroy()
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def power_on(self):
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if self.domain.isActive():
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return 0xd5 # Not valid in this state
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self.domain.create()
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def power_reset(self):
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if not self.domain.isActive():
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return 0xd5 # Not valid in this state
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self.domain.reset()
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def power_shutdown(self):
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if not self.domain.isActive():
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return 0xd5 # Not valid in this state
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self.domain.shutdown()
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def is_active(self):
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return self.domain.isActive()
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def check_console(self):
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if (self.state[0] == libvirt.VIR_DOMAIN_RUNNING
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or self.state[0] == libvirt.VIR_DOMAIN_PAUSED):
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if self.stream is None:
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self.stream = self.conn.newStream(libvirt.VIR_STREAM_NONBLOCK)
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self.domain.openConsole(None, self.stream, 0)
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self.stream.eventAddCallback(libvirt.VIR_STREAM_EVENT_READABLE,
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stream_callback, self)
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else:
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if self.stream:
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self.stream.eventRemoveCallback()
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self.stream = None
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return self.run_console
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async def activate_payload(self, request, session):
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# captured for stream_callback, which runs on a libvirt thread
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self.asyncloop = asyncio.get_running_loop()
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if self.sol_thread is not None and self.sol_thread.is_alive():
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# The thread from the previous console has not come back out of
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# virEventRunDefaultImpl. A second one would run a second event
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# loop against the same stream, and setting run_console below
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# would revive the first one when it finally wakes.
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return await session.send_ipmi_response(code=0x80)
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self.sol_thread = None
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wasactive = self.activated
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await super(LibvirtBmc, self).activate_payload(request, session)
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if wasactive or not self.activated:
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# the base handler refused: no io handler, or the domain is not
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# running, so activated stayed false; or a console was already up,
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# in which case activated was true before we asked and the thread
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# for it is already running. Either way there is nothing to start.
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return
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self.run_console = True
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self.sol_thread = threading.Thread(target=self.loop)
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# virEventRunDefaultImpl can wait for an event that never comes, so
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# this thread has no reliable end of its own
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self.sol_thread.daemon = True
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self.sol_thread.start()
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async def deactivate_payload(self, request, session):
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if self.activated and self.sol_thread:
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self.run_console = False
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# The thread only notices that after virEventRunDefaultImpl
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# returns, which is documented as possibly never. Waiting on the
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# event loop would stall every other session, so wait off it, and
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# briefly: this is only to clear the state promptly in the normal
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# case. A thread that outlives the wait stays owned here, and
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# activate_payload refuses to start another until it is gone.
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await asyncio.get_running_loop().run_in_executor(
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None, self.sol_thread.join, 1)
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if not self.sol_thread.is_alive():
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self.sol_thread = None
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await super(LibvirtBmc, self).deactivate_payload(request, session)
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async def iohandler(self, data):
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if self.stream:
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self.stream.send(data)
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def loop(self):
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# virEventRunDefaultImpl waits for an event, and an idle domain can go
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# a long time without producing one. Give it a reason to return, or
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# the loop never reconsiders check_console and the thread cannot be
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# stopped at all: measured as never waking without this, and returning
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# at once with it.
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timer = libvirt.virEventAddTimeout(500, lambda *args: None, None)
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try:
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while self.check_console():
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libvirt.virEventRunDefaultImpl()
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finally:
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if timer >= 0:
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libvirt.virEventRemoveTimeout(timer)
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def main():
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parser = argparse.ArgumentParser(
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prog='virshbmc',
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description='Pretend to be a BMC and proxy to virsh',
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formatter_class=argparse.ArgumentDefaultsHelpFormatter
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)
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parser.add_argument('--port',
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dest='port',
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type=int,
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default=623,
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help='(UDP) port to listen on')
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parser.add_argument('--connect',
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dest='hypervisor',
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default='qemu:///system',
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help='The hypervisor to connect to')
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parser.add_argument('--domain',
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dest='domain',
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required=True,
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help='The name of the domain to manage')
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args = parser.parse_args()
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libvirt.virEventRegisterDefaultImpl()
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libvirt.registerErrorHandler(error_handler, None)
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mybmc = LibvirtBmc({'admin': 'password'},
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hypervisor=args.hypervisor,
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domain=args.domain,
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port=args.port)
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asyncio.run(mybmc.listen())
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if __name__ == '__main__':
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sys.exit(main())
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