198 lines
7.0 KiB
Python
198 lines
7.0 KiB
Python
# 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"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import datetime
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from oslo_config import cfg
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from sqlalchemy import create_engine
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from sqlalchemy import desc
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from sqlalchemy.ext.automap import automap_base
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from sqlalchemy.orm import sessionmaker
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from monasca_transform.db.db_utils import DbUtil
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from monasca_transform.offset_specs import OffsetSpec
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from monasca_transform.offset_specs import OffsetSpecs
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Base = automap_base()
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class MySQLOffsetSpec(Base, OffsetSpec):
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__tablename__ = 'kafka_offsets'
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def __str__(self):
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return "%s,%s,%s,%s,%s,%s,%s,%s" % (str(self.id),
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str(self.topic),
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str(self.partition),
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str(self.until_offset),
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str(self.from_offset),
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str(self.batch_time),
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str(self.last_updated),
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str(self.revision))
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class MySQLOffsetSpecs(OffsetSpecs):
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def __init__(self):
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db = create_engine(DbUtil.get_python_db_connection_string(),
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isolation_level="READ UNCOMMITTED")
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if cfg.CONF.service.enable_debug_log_entries:
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db.echo = True
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# reflect the tables
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Base.prepare(db, reflect=True)
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Session = sessionmaker(bind=db)
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self.session = Session()
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# keep these many offset versions around
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self.MAX_REVISIONS = cfg.CONF.repositories.offsets_max_revisions
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def _manage_offset_revisions(self):
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"""manage offset versions"""
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distinct_offset_specs = self.session.query(
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MySQLOffsetSpec).group_by(MySQLOffsetSpec.app_name,
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MySQLOffsetSpec.topic,
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MySQLOffsetSpec.partition
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).all()
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for distinct_offset_spec in distinct_offset_specs:
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ordered_versions = self.session.query(
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MySQLOffsetSpec).filter_by(
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app_name=distinct_offset_spec.app_name,
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topic=distinct_offset_spec.topic,
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partition=distinct_offset_spec.partition).order_by(
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desc(MySQLOffsetSpec.id)).all()
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revision = 1
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for version_spec in ordered_versions:
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version_spec.revision = revision
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revision = revision + 1
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# delete any revisions excess than required
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self.session.query(MySQLOffsetSpec).filter(
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MySQLOffsetSpec.revision > self.MAX_REVISIONS).delete(
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synchronize_session="fetch")
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def get_kafka_offsets(self, app_name):
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return {'%s_%s_%s' % (
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offset.get_app_name(), offset.get_topic(), offset.get_partition()
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): offset for offset in self.session.query(MySQLOffsetSpec).filter(
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MySQLOffsetSpec.app_name == app_name,
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MySQLOffsetSpec.revision == 1).all()}
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def get_kafka_offsets_by_revision(self, app_name, revision):
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return {'%s_%s_%s' % (
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offset.get_app_name(), offset.get_topic(), offset.get_partition()
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): offset for offset in self.session.query(MySQLOffsetSpec).filter(
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MySQLOffsetSpec.app_name == app_name,
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MySQLOffsetSpec.revision == revision).all()}
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def get_most_recent_batch_time_from_offsets(self, app_name, topic):
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try:
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# get partition 0 as a representative of all others
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offset = self.session.query(MySQLOffsetSpec).filter(
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MySQLOffsetSpec.app_name == app_name,
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MySQLOffsetSpec.topic == topic,
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MySQLOffsetSpec.partition == 0,
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MySQLOffsetSpec.revision == 1).one()
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most_recent_batch_time = datetime.datetime.strptime(
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offset.get_batch_time(),
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'%Y-%m-%d %H:%M:%S')
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except Exception:
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most_recent_batch_time = None
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return most_recent_batch_time
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def delete_all_kafka_offsets(self, app_name):
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try:
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self.session.query(MySQLOffsetSpec).filter(
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MySQLOffsetSpec.app_name == app_name).delete()
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self.session.commit()
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except Exception:
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# Seems like there isn't much that can be done in this situation
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pass
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def add_all_offsets(self, app_name, offsets,
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batch_time_info):
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"""add offsets. """
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try:
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# batch time
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batch_time = \
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batch_time_info.strftime(
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'%Y-%m-%d %H:%M:%S')
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# last updated
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last_updated = \
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datetime.datetime.now().strftime(
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'%Y-%m-%d %H:%M:%S')
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NEW_REVISION_NO = -1
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for o in offsets:
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offset_spec = MySQLOffsetSpec(
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topic=o.topic,
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app_name=app_name,
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partition=o.partition,
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from_offset=o.fromOffset,
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until_offset=o.untilOffset,
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batch_time=batch_time,
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last_updated=last_updated,
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revision=NEW_REVISION_NO)
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self.session.add(offset_spec)
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# manage versions
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self._manage_offset_revisions()
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self.session.commit()
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except Exception:
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self.session.rollback()
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raise
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def add(self, app_name, topic, partition,
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from_offset, until_offset, batch_time_info):
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"""add offset info. """
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try:
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# batch time
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batch_time = \
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batch_time_info.strftime(
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'%Y-%m-%d %H:%M:%S')
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# last updated
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last_updated = \
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datetime.datetime.now().strftime(
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'%Y-%m-%d %H:%M:%S')
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NEW_REVISION_NO = -1
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offset_spec = MySQLOffsetSpec(
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topic=topic,
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app_name=app_name,
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partition=partition,
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from_offset=from_offset,
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until_offset=until_offset,
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batch_time=batch_time,
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last_updated=last_updated,
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revision=NEW_REVISION_NO)
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self.session.add(offset_spec)
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# manage versions
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self._manage_offset_revisions()
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self.session.commit()
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except Exception:
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self.session.rollback()
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raise
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