0250f81cdc
This commit adds a schema management tool for the Monasca
configuration database. Apart from the usual OpenStack schema
management tool subcommands (stamp, upgrade, version) it has
two extra subcommands:
* fingerprint: for computing a SHA1 fingerprint of the
currently currently active database schema.
* detect-revision: for identifiying the Alembic revision
(if any) corresponding to a database
schema that was created with one of the
legacy SQL scripts.
The data provided by the detect-revision subcommand can be
used for stamping the database with Alembic version metadata
when transitioning an existing Monasca configuration database
to Alembic based database migrations.
Story: 2001654
Task: 14341
Change-Id: Ibdd877a23ab5d6d1bbf8d83515c0197554098526
67 lines
2.5 KiB
Python
67 lines
2.5 KiB
Python
# Copyright 2018 SUSE Linux GmbH
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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 hashlib
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from sqlalchemy import MetaData
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# Map of SHA1 fingerprints to alembic revisions.
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_REVS = {"43e5913b0272077321ab6f25ffbcda7149b6284b": "00597b5c8325",
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"c4e5c870c705421faa4041405b5a895970faa434": "0cce983d957a",
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"f7a79c4eea9c9d130277a64eb6d2d16587088dbb": "30181b42434b",
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"529f266f7ed42929d5405616810546e4615153e8": "6b2b88f3cab4",
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"857904f960af77c0554c4c38d73ed47df7c949b4": "8781a256f0c1",
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"773489fb7bfa84bf2db0e1ff1ab96bce7fb4ecd7": "c2f85438d6f3",
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"f29f18a30519a1bae9dcee85a604eb72886e34d3": "d8b801498850",
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"dd47cb01f11cb5cd7fec6bda6a190bc10b4659a6": "f69cb3152a76",
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# Database created with UTF8 default charset
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"5dda7af1fd708095e6c9298976abb1242bbd1848": "8781a256f0c1",
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"7fb1ce4a60f0065505096843bfd21f4ef4c5d1e0": "f69cb3152a76"}
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class Fingerprint(object):
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def __init__(self, engine):
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metadata = MetaData(bind=engine, reflect=True)
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schema_strings = []
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for table in metadata.sorted_tables:
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# Omit this table to maintain a consistent fingerprint when
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# fingerprint a migrated schema is fingerprinted.
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if table.name == "alembic_version":
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continue
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table.metadata = None
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columns = []
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for column in table.columns:
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column.server_default = None
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columns.append(repr(column))
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table.columns = []
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schema_strings.append(repr(table))
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for column in columns:
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schema_strings.append(" " + repr(column))
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schema_strings.append("")
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self.schema_raw = "\n".join(schema_strings)
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self.sha1 = hashlib.sha1(self.schema_raw).hexdigest()
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try:
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self.revision = _REVS[self.sha1]
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except KeyError:
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# Fingerprint does not match any revisions
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self.revision = None
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