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free_space.py
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free_space.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.
"""
Collector to get the SRM free and used information for DATADISK RSEs.
"""
from rucio.db.sqla.models import RSEAttrAssociation, RSEUsage
from rucio.db.sqla.session import read_session
class FreeSpaceCollector:
"""
Collector to get the SRM free and used information for DATADISK RSEs.
"""
class _FreeSpaceCollector:
"""
Hidden implementation
"""
def __init__(self):
self.rses = {}
@read_session
def _collect_free_space(self, *, session=None):
"""
Retrieve free space from database
"""
query = session.query(RSEUsage.rse_id, RSEUsage.free, RSEUsage.used).\
join(RSEAttrAssociation, RSEUsage.rse_id == RSEAttrAssociation.rse_id).\
filter(RSEUsage.source == 'storage').filter(RSEAttrAssociation.key == 'type', RSEAttrAssociation.value == 'DATADISK')
for rse_id, free, used in query:
self.rses[rse_id] = {'total': used + free, 'used': used, 'free': free}
instance = None
def __init__(self):
if not FreeSpaceCollector.instance:
FreeSpaceCollector.instance = FreeSpaceCollector._FreeSpaceCollector()
def collect_free_space(self):
"""
Execute the free space collector
"""
self.instance._collect_free_space()
def get_rse_space(self):
"""
Return the RSE space
"""
return self.instance.rses