81 lines
2.7 KiB
Python
81 lines
2.7 KiB
Python
# Copyright 2017 The Openstack-Helm Authors.
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#
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# 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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from threading import Thread
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from threading import Lock
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from time import sleep, time
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import logging
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from prometheus_client import CollectorRegistry, generate_latest, Gauge
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logger = logging.getLogger(__name__)
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class ThreadSafeDict(dict):
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def __init__(self, * p_arg, ** n_arg):
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dict.__init__(self, * p_arg, ** n_arg)
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self._lock = Lock()
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def __enter__(self):
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self._lock.acquire()
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return self
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def __exit__(self, type, value, traceback):
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self._lock.release()
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class OSCache(Thread):
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def __init__(self, refresh_interval, region):
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Thread.__init__(self)
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self.daemon = True
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self.duration = 0
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self.refresh_interval = refresh_interval
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self.cache = ThreadSafeDict()
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self.region = region
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self.osclients = []
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def cache_me(self, osclient):
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self.osclients.append(osclient)
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logger.debug("new osclient added to cache")
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def run(self):
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while True:
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start_time = time()
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for osclient in self.osclients:
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try:
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self.cache[osclient.get_cache_key(
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)] = osclient.build_cache_data()
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except Exception as e:
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logger.error(str(e))
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logger.error(
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"failed to get data for cache key {}".format(
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osclient.get_cache_key()))
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self.duration = time() - start_time
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sleep(self.refresh_interval)
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def get_cache_data(self, key):
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if key in self.cache:
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return self.cache[key]
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else:
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return []
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def get_stats(self):
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registry = CollectorRegistry()
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labels = ['region']
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label_values = [self.region]
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duration = Gauge('openstack_exporter_cache_refresh_duration_seconds',
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'Cache refresh duration in seconds.',
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labels, registry=registry)
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duration.labels(*label_values).set(self.duration)
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return generate_latest(registry)
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