#!/usr/bin/env python
# Copyright 2017 The Openstack-Helm Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from threading import Thread
from threading import Lock
from prometheus_client import CollectorRegistry, generate_latest, Gauge
from time import sleep, time
import logging
logging.basicConfig(
level=logging.DEBUG,
format="%(asctime)s:%(levelname)s:%(message)s")
logger = logging.getLogger(__name__)
class ThreadSafeDict(dict):
def __init__(self, * p_arg, ** n_arg):
dict.__init__(self, * p_arg, ** n_arg)
self._lock = Lock()
def __enter__(self):
self._lock.acquire()
return self
def __exit__(self, type, value, traceback):
self._lock.release()
class OSCache(Thread):
def __init__(self, refresh_interval, region):
Thread.__init__(self)
self.daemon = True
self.duration = 0
self.refresh_interval = refresh_interval
self.cache = ThreadSafeDict()
self.region = region
self.osclients = []
def cache_me(self, osclient):
self.osclients.append(osclient)
logger.debug("new osclient added to cache")
def run(self):
while True:
start_time = time()
for osclient in self.osclients:
try:
self.cache[osclient.get_cache_key(
)] = osclient.build_cache_data()
except Exception as e:
logger.error(str(e))
logger.error(
"failed to get data for cache key {}".format(
osclient.get_cache_key()))
self.duration = time() - start_time
sleep(self.refresh_interval)
def get_cache_data(self, key):
if key in self.cache:
return self.cache[key]
else:
return []
def get_stats(self):
registry = CollectorRegistry()
labels = ['region']
label_values = [self.region]
duration = Gauge('openstack_exporter_cache_refresh_duration_seconds',
'Cache refresh duration in seconds.',
labels, registry=registry)
duration.labels(*label_values).set(self.duration)
return generate_latest(registry)
