444d23ea3e
To facilitate database snap-shotting, we should standardize the way unique_key is stored by the drivers.. This patch adds the expectation to our DB API of how unique_key data can be accessed, extracted, and restored. Change-Id: I15c3c8d7b1b6aa257eebd8f11f9dbdd6eaa6bef5
71 lines
2.2 KiB
Python
71 lines
2.2 KiB
Python
# All Rights Reserved.
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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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from oslo_utils import timeutils
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SEND_ALL_TOPIC = 'D'
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DB_SYNC_MINIMUM_INTERVAL = 180
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UNIQUE_KEY_TABLE = 'unique_key'
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class DbUpdate(object):
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"""Encapsulates a DB update
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An instance of this object carries the information necessary to prioritize
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and process a request to update a DB entry.
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"""
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def __init__(self, table, key, action, value, timestamp=None,
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topic=SEND_ALL_TOPIC):
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if timestamp is None:
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timestamp = timeutils.utcnow()
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self.timestamp = timestamp
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self.key = key
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self.action = action
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self.table = table
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self.value = value
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self.topic = topic
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def to_dict(self):
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update = {
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'table': self.table,
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'key': self.key,
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'action': self.action,
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'value': self.value,
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'topic': self.topic
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}
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return update
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def __str__(self):
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return (
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"Action:%s, Table:%s, Key:%s Value:%s Topic:%s Timestamp: %s"
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) % (
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self.action,
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self.table,
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self.key,
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self.value,
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self.topic,
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self.timestamp,
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)
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def __lt__(self, other):
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"""Implements priority among updates
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Earlier timestamp always gets precedence. In the unlikely event that
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the timestamps are equal it falls back to a simple comparison of ids
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meaning the precedence is deteministic but meaningless.
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"""
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if self.timestamp != other.timestamp:
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return self.timestamp < other.timestamp
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return self.key < other.key
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