87 lines
2.6 KiB
Python
87 lines
2.6 KiB
Python
# Copyright 2015 Red Hat, Inc.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from oslo_log import log as logging
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from oslo_utils import excutils
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from neutron._i18n import _LE
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from neutron.agent.linux import async_process
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LOG = logging.getLogger(__name__)
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class IPMonitorEvent(object):
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def __init__(self, line, added, interface, cidr):
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self.line = line
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self.added = added
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self.interface = interface
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self.cidr = cidr
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def __str__(self):
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return self.line
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@classmethod
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def from_text(cls, line):
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route = line.split()
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try:
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first_word = route[0]
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except IndexError:
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with excutils.save_and_reraise_exception():
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LOG.error(_LE('Unable to parse route "%s"'), line)
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added = (first_word != 'Deleted')
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if not added:
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route = route[1:]
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try:
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interface = route[1]
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cidr = route[3]
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except IndexError:
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with excutils.save_and_reraise_exception():
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LOG.error(_LE('Unable to parse route "%s"'), line)
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return cls(line, added, interface, cidr)
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class IPMonitor(async_process.AsyncProcess):
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"""Wrapper over `ip monitor address`.
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To monitor and react indefinitely:
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m = IPMonitor(namespace='tmp', root_as_root=True)
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m.start()
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for iterable in m:
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event = IPMonitorEvent.from_text(iterable)
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print(event, event.added, event.interface, event.cidr)
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"""
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def __init__(self,
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namespace=None,
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run_as_root=True,
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respawn_interval=None):
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super(IPMonitor, self).__init__(['ip', '-o', 'monitor', 'address'],
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run_as_root=run_as_root,
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respawn_interval=respawn_interval,
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namespace=namespace)
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def __iter__(self):
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return self.iter_stdout(block=True)
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def start(self):
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super(IPMonitor, self).start(block=True)
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def stop(self):
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super(IPMonitor, self).stop(block=True)
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