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expiring_dataset_cache.py
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expiring_dataset_cache.py
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# Copyright European Organization for Nuclear Research (CERN) since 2012
#
# 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.
"""
Expiring Dataset Cache
"""
from uuid import uuid4
from redis import StrictRedis
class ExpiringDatasetCache:
"""
Cache with expiring values to keep track of recently created replicas.
"""
def __init__(self, redis_host, redis_port, timeout=1, prefix='expiring_did_cache'):
self._redis = StrictRedis(host=redis_host, port=redis_port)
self._prefix = prefix + '_' + str(uuid4()).split('-')[0]
self._timeout = timeout
def add_dataset(self, dataset):
""" Adds a datasets to cache with lifetime """
key = ':'.join((self._prefix, dataset))
self._redis.set(key, 1)
self._redis.expire(key, self._timeout)
def check_dataset(self, dataset):
""" Checks if dataset is still in cache """
key = ':'.join((self._prefix, dataset))
if self._redis.get(key) is None:
return False
return True