49 lines
1.6 KiB
Python
49 lines
1.6 KiB
Python
# -*- coding: utf-8 -*-
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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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"""Collectd meter for libvirt plugin"""
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from __future__ import unicode_literals
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from collectd_ceilometer.meters.base import Meter
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from collectd_ceilometer.settings import Config
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import libvirt
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import threading
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class LibvirtMeter(Meter):
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"""Specialization for libvirt plugin"""
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def __init__(self):
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self._cache_lock = threading.Lock()
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self._conn = None
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self._vms = {}
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def hostname(self, vl):
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"""Get hostname based on the input"""
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hostname = self._vms.get(vl.host)
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if not hostname:
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with self._cache_lock:
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# check again with lock because another thread could
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# store the hostname meanwhile
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hostname = self._vms.get(vl.host)
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if not hostname:
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if self._conn is None:
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self._conn = libvirt.openReadOnly(
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Config.instance().LIBVIRT_CONN_URI)
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hostname = self._conn.lookupByName(vl.host).UUIDString()
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self._vms[vl.host] = hostname
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return hostname
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