5b1ffc3e2b
Separate out the persister classes into their own python files and clean up some unused code for start up. Change-Id: Id1460baef9e06025ed57030438a0021c253cc99a
121 lines
3.9 KiB
Python
121 lines
3.9 KiB
Python
# (C) Copyright 2016 Hewlett Packard Enterprise Development Company LP
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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
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# 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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import hashlib
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import json
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from cassandra.query import BatchStatement
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from oslo_log import log
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import urllib
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from repositories.cassandra.abstract_repository import AbstractCassandraRepository
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from repositories.utils import parse_measurement_message
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LOG = log.getLogger(__name__)
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class MetricCassandraRepository(AbstractCassandraRepository):
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def __init__(self):
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super(MetricCassandraRepository, self).__init__()
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self._insert_measurement_stmt = self.cassandra_session.prepare(
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'insert into measurements (tenant_id,'
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'region, metric_hash, time_stamp, value,'
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'value_meta) values (?, ?, ?, ?, ?, ?)')
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self._insert_metric_map_stmt = self.cassandra_session.prepare(
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'insert into metric_map (tenant_id,'
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'region, metric_hash, '
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'metric_set) values'
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'(?,?,?,?)')
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def process_message(self, message):
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(dimensions, metric_name, region, tenant_id, time_stamp, value,
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value_meta) = parse_measurement_message(message)
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metric_hash, metric_set = create_metric_hash(metric_name,
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dimensions)
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measurement = (tenant_id.encode('utf8'),
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region.encode('utf8'),
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metric_hash,
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time_stamp,
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value,
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json.dumps(value_meta, ensure_ascii=False).encode(
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'utf8'))
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LOG.debug(measurement)
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return MetricMeasurementInfo(
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tenant_id.encode('utf8'),
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region.encode('utf8'),
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metric_hash,
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metric_set,
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measurement)
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def write_batch(self, metric_measurement_infos):
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for metric_measurement_info in metric_measurement_infos:
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self._batch_stmt.add(self._insert_measurement_stmt,
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metric_measurement_info.measurement)
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metric_map = (metric_measurement_info.tenant_id,
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metric_measurement_info.region,
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metric_measurement_info.metric_hash,
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metric_measurement_info.metric_set)
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self._batch_stmt.add(self._insert_metric_map_stmt,
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metric_map)
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self.cassandra_session.execute(self._batch_stmt)
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self._batch_stmt = BatchStatement()
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class MetricMeasurementInfo(object):
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def __init__(self, tenant_id, region, metric_hash, metric_set,
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measurement):
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self.tenant_id = tenant_id
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self.region = region
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self.metric_hash = metric_hash
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self.metric_set = metric_set
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self.measurement = measurement
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def create_metric_hash(metric_name, dimensions):
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metric_name_part = '__name__' + '=' + urllib.quote_plus(metric_name)
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hash_string = metric_name_part
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metric_set = set()
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metric_set.add(metric_name_part)
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for dim_name in sorted(dimensions.iterkeys()):
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dimension = (urllib.quote_plus(dim_name) + '=' + urllib.quote_plus(
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dimensions[dim_name]))
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metric_set.add(dimension)
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hash_string += dimension
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sha1_hash = hashlib.sha1(hash_string).hexdigest()
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return bytearray.fromhex(sha1_hash), metric_set
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