cac62bf2b1
Collectd module could be required by plugin components but importing it from their modules makes unit testing harder because it would require running tests from inside collectd process. This changes make the module available by passing it to component constructors which makes testing and mocking easier. Related-Bug: #1583301 Change-Id: I6abfd330c8f3b5108e78543df7c803cd65a15655
50 lines
1.7 KiB
Python
50 lines
1.7 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, collectd):
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super(LibvirtMeter, self).__init__(collectd=collectd)
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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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