1ce4b9a9f5
This is the next step towards CI/CD: This code enables testing of DB migrations against real databases - MySQL and Postgres. Unit testing on in-memory sqlite doesn't work with this patch (there seems to be a problem with Alembic/in-memory-sqlite combination). In case if MySQL and PostgreSQL with specifc user/password and database are present, opportunistic tests will be started automatically. See storyboard/tests/db/sqlalchemy/test_migrations.py for instructions. OpenStack CI infrastructure provides these, so we get tests against MySQL and Postgres with this commit. Note(1): this patch doesn't modify database model. The main goal of this patch is to enable continuous testing of DB migrations. Note(2): most of the code is based on Nova. Which is good because eventually it'll be extracted to Oslo library and we'll be able to use Oslo instead of custom code. Change-Id: Ia763124bea9ac8e39c6604f04fd99fa83645d5ba
586 lines
23 KiB
Python
586 lines
23 KiB
Python
# Copyright 2010-2011 OpenStack Foundation
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# Copyright 2012-2013 IBM Corp.
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# 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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#
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#
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# Ripped off from Nova's test_migrations.py
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# The only difference between Nova and this code is usage of alembic instead
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# of sqlalchemy migrations.
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#
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# There is an ongoing work to extact similar code to oslo incubator. Once it is
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# extracted we'll be able to remove this file and use oslo.
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import ConfigParser
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import io
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import os
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import urlparse
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from alembic import command
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from alembic import config as alembic_config
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from alembic import migration
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from oslo.config import cfg
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import sqlalchemy
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import sqlalchemy.exc
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import storyboard.db.migration
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from storyboard.openstack.common.db.sqlalchemy import session
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from storyboard.openstack.common import lockutils
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from storyboard.openstack.common import log as logging
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from storyboard.openstack.common import processutils
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from storyboard.tests import base
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LOG = logging.getLogger(__name__)
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CONF = cfg.CONF
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synchronized = lockutils.synchronized_with_prefix('storyboard-')
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def _get_connect_string(backend, user, passwd, database):
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"""Try to get a connection with a very specific set of values, if we get
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these then we'll run the tests, otherwise they are skipped
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"""
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if backend == "postgres":
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backend = "postgresql+psycopg2"
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elif backend == "mysql":
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backend = "mysql+mysqldb"
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else:
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raise Exception("Unrecognized backend: '%s'" % backend)
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return ("%s://%s:%s@localhost/%s" % (backend, user, passwd, database))
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def _is_backend_avail(backend, user, passwd, database):
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try:
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connect_uri = _get_connect_string(backend, user, passwd, database)
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engine = sqlalchemy.create_engine(connect_uri)
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connection = engine.connect()
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except Exception:
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# intentionally catch all to handle exceptions even if we don't
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# have any backend code loaded.
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return False
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else:
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connection.close()
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engine.dispose()
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return True
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def _have_mysql(user, passwd, database):
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present = os.environ.get('STORYBOARD_MYSQL_PRESENT')
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if present is None:
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return _is_backend_avail('mysql', user, passwd, database)
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return present.lower() in ('', 'true')
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def _have_postgresql(user, passwd, database):
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present = os.environ.get('STORYBOARD_TEST_POSTGRESQL_PRESENT')
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if present is None:
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return _is_backend_avail('postgres', user, passwd, database)
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return present.lower() in ('', 'true')
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def get_mysql_connection_info(conn_pieces):
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database = conn_pieces.path.strip('/')
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loc_pieces = conn_pieces.netloc.split('@')
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host = loc_pieces[1]
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auth_pieces = loc_pieces[0].split(':')
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user = auth_pieces[0]
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password = ""
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if len(auth_pieces) > 1:
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if auth_pieces[1].strip():
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password = "-p\"%s\"" % auth_pieces[1]
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return (user, password, database, host)
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def get_pgsql_connection_info(conn_pieces):
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database = conn_pieces.path.strip('/')
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loc_pieces = conn_pieces.netloc.split('@')
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host = loc_pieces[1]
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auth_pieces = loc_pieces[0].split(':')
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user = auth_pieces[0]
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password = ""
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if len(auth_pieces) > 1:
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password = auth_pieces[1].strip()
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return (user, password, database, host)
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class CommonTestsMixIn(object):
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"""These tests are shared between TestStoryboardMigrations and
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TestBaremetalMigrations.
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BaseMigrationTestCase is effectively an abstract class, meant to be derived
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from and not directly tested against; that's why these `test_` methods need
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to be on a Mixin, so that they won't be picked up as valid tests for
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BaseMigrationTestCase.
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"""
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def test_walk_versions(self):
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for key, engine in self.engines.items():
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# We start each walk with a completely blank slate.
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self._reset_database(key)
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self._walk_versions(engine, self.snake_walk, self.downgrade)
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def test_mysql_opportunistically(self):
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self._test_mysql_opportunistically()
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def test_mysql_connect_fail(self):
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"""Test that we can trigger a mysql connection failure and we fail
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gracefully to ensure we don't break people without mysql
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"""
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if _is_backend_avail('mysql', "openstack_cifail", self.PASSWD,
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self.DATABASE):
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self.fail("Shouldn't have connected")
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def test_postgresql_opportunistically(self):
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self._test_postgresql_opportunistically()
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def test_postgresql_connect_fail(self):
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"""Test that we can trigger a postgres connection failure and we fail
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gracefully to ensure we don't break people without postgres
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"""
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if _is_backend_avail('postgres', "openstack_cifail", self.PASSWD,
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self.DATABASE):
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self.fail("Shouldn't have connected")
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class BaseMigrationTestCase(base.TestCase):
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"""Base class for testing migrations and migration utils. This sets up
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and configures the databases to run tests against.
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"""
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# NOTE(jhesketh): It is expected that tests clean up after themselves.
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# This is necessary for concurrency to allow multiple tests to work on
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# one database.
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# The full migration walk tests however do call the old _reset_databases()
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# to throw away whatever was there so they need to operate on their own
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# database that we know isn't accessed concurrently.
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# Hence, BaseWalkMigrationTestCase overwrites the engine list.
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USER = None
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PASSWD = None
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DATABASE = None
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TIMEOUT_SCALING_FACTOR = 2
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def __init__(self, *args, **kwargs):
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super(BaseMigrationTestCase, self).__init__(*args, **kwargs)
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self.DEFAULT_CONFIG_FILE = os.path.join(
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os.path.dirname(__file__),
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'test_migrations.conf')
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# Test machines can set the STORYBOARD_TEST_MIGRATIONS_CONF variable
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# to override the location of the config file for migration testing
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self.CONFIG_FILE_PATH = os.environ.get(
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'STORYBOARD_TEST_MIGRATIONS_CONF',
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self.DEFAULT_CONFIG_FILE)
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self.ALEMBIC_CONFIG = alembic_config.Config(
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os.path.join(os.path.dirname(storyboard.db.migration.__file__),
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'alembic.ini')
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)
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self.ALEMBIC_CONFIG.storyboard_config = CONF
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self.snake_walk = False
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self.downgrade = False
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self.test_databases = {}
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self.migration = None
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self.migration_api = None
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def setUp(self):
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super(BaseMigrationTestCase, self).setUp()
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self._load_config()
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def _load_config(self):
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# Load test databases from the config file. Only do this
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# once. No need to re-run this on each test...
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LOG.debug('config_path is %s' % self.CONFIG_FILE_PATH)
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if os.path.exists(self.CONFIG_FILE_PATH):
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cp = ConfigParser.RawConfigParser()
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try:
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cp.read(self.CONFIG_FILE_PATH)
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config = cp.options('unit_tests')
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for key in config:
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self.test_databases[key] = cp.get('unit_tests', key)
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self.snake_walk = cp.getboolean('walk_style', 'snake_walk')
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self.downgrade = cp.getboolean('walk_style', 'downgrade')
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except ConfigParser.ParsingError as e:
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self.fail("Failed to read test_migrations.conf config "
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"file. Got error: %s" % e)
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else:
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self.fail("Failed to find test_migrations.conf config "
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"file.")
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self.engines = {}
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for key, value in self.test_databases.items():
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self.engines[key] = sqlalchemy.create_engine(value)
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# NOTE(jhesketh): We only need to make sure the databases are created
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# not necessarily clean of tables.
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self._create_databases()
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def execute_cmd(self, cmd=None):
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out, err = processutils.trycmd(cmd, shell=True, discard_warnings=True)
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output = out or err
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LOG.debug(output)
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self.assertEqual('', err,
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"Failed to run: %s\n%s" % (cmd, output))
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@synchronized('pgadmin', external=True, lock_path='/tmp')
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def _reset_pg(self, conn_pieces):
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(user, password, database, host) = \
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get_pgsql_connection_info(conn_pieces)
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os.environ['PGPASSWORD'] = password
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os.environ['PGUSER'] = user
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# note(boris-42): We must create and drop database, we can't
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# drop database which we have connected to, so for such
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# operations there is a special database template1.
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sqlcmd = ("psql -w -U %(user)s -h %(host)s -c"
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" '%(sql)s' -d template1")
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sqldict = {'user': user, 'host': host}
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sqldict['sql'] = ("drop database if exists %s;") % database
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droptable = sqlcmd % sqldict
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self.execute_cmd(droptable)
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sqldict['sql'] = ("create database %s;") % database
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createtable = sqlcmd % sqldict
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self.execute_cmd(createtable)
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os.unsetenv('PGPASSWORD')
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os.unsetenv('PGUSER')
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@synchronized('mysql', external=True, lock_path='/tmp')
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def _reset_mysql(self, conn_pieces):
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# We can execute the MySQL client to destroy and re-create
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# the MYSQL database, which is easier and less error-prone
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# than using SQLAlchemy to do this via MetaData...trust me.
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(user, password, database, host) = \
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get_mysql_connection_info(conn_pieces)
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sql = ("drop database if exists %(database)s; "
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"create database %(database)s;" % {'database': database})
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cmd = ("mysql -u \"%(user)s\" %(password)s -h %(host)s "
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"-e \"%(sql)s\"" % {'user': user, 'password': password,
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'host': host, 'sql': sql})
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self.execute_cmd(cmd)
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@synchronized('sqlite', external=True, lock_path='/tmp')
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def _reset_sqlite(self, conn_pieces):
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# We can just delete the SQLite database, which is
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# the easiest and cleanest solution
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db_path = conn_pieces.path.strip('/')
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if os.path.exists(db_path):
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os.unlink(db_path)
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# No need to recreate the SQLite DB. SQLite will
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# create it for us if it's not there...
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def _create_databases(self):
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"""Create all configured databases as needed."""
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for key, engine in self.engines.items():
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self._create_database(key)
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def _create_database(self, key):
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"""Create database if it doesn't exist."""
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conn_string = self.test_databases[key]
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conn_pieces = urlparse.urlparse(conn_string)
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if conn_string.startswith('mysql'):
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(user, password, database, host) = \
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get_mysql_connection_info(conn_pieces)
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sql = "create database if not exists %s;" % database
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cmd = ("mysql -u \"%(user)s\" %(password)s -h %(host)s "
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"-e \"%(sql)s\"" % {'user': user, 'password': password,
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'host': host, 'sql': sql})
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self.execute_cmd(cmd)
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elif conn_string.startswith('postgresql'):
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(user, password, database, host) = \
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get_pgsql_connection_info(conn_pieces)
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os.environ['PGPASSWORD'] = password
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os.environ['PGUSER'] = user
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sqlcmd = ("psql -w -U %(user)s -h %(host)s -c"
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" '%(sql)s' -d template1")
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sql = ("create database if not exists %s;") % database
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createtable = sqlcmd % {'user': user, 'host': host, 'sql': sql}
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# 0 means databases is created
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# 256 means it already exists (which is fine)
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# otherwise raise an error
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out, err = processutils.trycmd(createtable, shell=True,
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check_exit_code=[0, 256],
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discard_warnings=True)
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output = out or err
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if err != '':
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self.fail("Failed to run: %s\n%s" % (createtable, output))
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os.unsetenv('PGPASSWORD')
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os.unsetenv('PGUSER')
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def _reset_databases(self):
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"""Reset all configured databases."""
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for key, engine in self.engines.items():
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self._reset_database(key)
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def _reset_database(self, key):
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"""Reset specific database."""
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engine = self.engines[key]
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conn_string = self.test_databases[key]
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conn_pieces = urlparse.urlparse(conn_string)
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engine.dispose()
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if conn_string.startswith('sqlite'):
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self._reset_sqlite(conn_pieces)
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elif conn_string.startswith('mysql'):
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self._reset_mysql(conn_pieces)
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elif conn_string.startswith('postgresql'):
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self._reset_pg(conn_pieces)
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class BaseWalkMigrationTestCase(BaseMigrationTestCase):
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"""BaseWalkMigrationTestCase loads in an alternative set of databases for
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testing against. This is necessary as the default databases can run tests
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concurrently without interfering with itself. It is expected that
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databases listed under [migraiton_dbs] in the configuration are only being
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accessed by one test at a time. Currently only test_walk_versions accesses
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the databases (and is the only method that calls _reset_database() which
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is clearly problematic for concurrency).
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"""
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def _load_config(self):
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# Load test databases from the config file. Only do this
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# once. No need to re-run this on each test...
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LOG.debug('config_path is %s' % self.CONFIG_FILE_PATH)
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if os.path.exists(self.CONFIG_FILE_PATH):
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cp = ConfigParser.RawConfigParser()
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try:
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cp.read(self.CONFIG_FILE_PATH)
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config = cp.options('migration_dbs')
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for key in config:
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self.test_databases[key] = cp.get('migration_dbs', key)
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self.snake_walk = cp.getboolean('walk_style', 'snake_walk')
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self.downgrade = cp.getboolean('walk_style', 'downgrade')
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except ConfigParser.ParsingError as e:
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self.fail("Failed to read test_migrations.conf config "
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"file. Got error: %s" % e)
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else:
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self.fail("Failed to find test_migrations.conf config "
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"file.")
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self.engines = {}
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for key, value in self.test_databases.items():
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self.engines[key] = sqlalchemy.create_engine(value)
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self._create_databases()
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def _configure(self, engine):
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"""For each type of repository we should do some of configure steps.
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For migrate_repo we should set under version control our database.
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For alembic we should configure database settings. For this goal we
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should use oslo.config and openstack.commom.db.sqlalchemy.session with
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database functionality (reset default settings and session cleanup).
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"""
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CONF.set_override('connection', str(engine.url), group='database')
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session.cleanup()
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def _test_mysql_opportunistically(self):
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# Test that table creation on mysql only builds InnoDB tables
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if not _have_mysql(self.USER, self.PASSWD, self.DATABASE):
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self.skipTest("mysql not available")
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# add this to the global lists to make reset work with it, it's removed
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# automatically in tearDown so no need to clean it up here.
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connect_string = _get_connect_string("mysql", self.USER, self.PASSWD,
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self.DATABASE)
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(user, password, database, host) = \
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get_mysql_connection_info(urlparse.urlparse(connect_string))
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engine = sqlalchemy.create_engine(connect_string)
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self.engines[database] = engine
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self.test_databases[database] = connect_string
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# build a fully populated mysql database with all the tables
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self._reset_database(database)
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self._walk_versions(engine, self.snake_walk, self.downgrade)
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connection = engine.connect()
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# sanity check
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total = connection.execute("SELECT count(*) "
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"from information_schema.TABLES "
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"where TABLE_SCHEMA='%(database)s'" %
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{'database': database})
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self.assertTrue(total.scalar() > 0, "No tables found. Wrong schema?")
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connection.close()
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del(self.engines[database])
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del(self.test_databases[database])
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def _test_postgresql_opportunistically(self):
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# Test postgresql database migration walk
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if not _have_postgresql(self.USER, self.PASSWD, self.DATABASE):
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self.skipTest("postgresql not available")
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# add this to the global lists to make reset work with it, it's removed
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# automatically in tearDown so no need to clean it up here.
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connect_string = _get_connect_string("postgres", self.USER,
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self.PASSWD, self.DATABASE)
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engine = sqlalchemy.create_engine(connect_string)
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(user, password, database, host) = \
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get_mysql_connection_info(urlparse.urlparse(connect_string))
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self.engines[database] = engine
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self.test_databases[database] = connect_string
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# build a fully populated postgresql database with all the tables
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self._reset_database(database)
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self._walk_versions(engine, self.snake_walk, self.downgrade)
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del(self.engines[database])
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del(self.test_databases[database])
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def _alembic_command(self, alembic_command, engine, *args, **kwargs):
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"""Most of alembic command return data into output.
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We should redefine this setting for getting info.
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"""
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self.ALEMBIC_CONFIG.stdout = buf = io.StringIO()
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CONF.set_override('connection', str(engine.url), group='database')
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session.cleanup()
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getattr(command, alembic_command)(*args, **kwargs)
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res = buf.getvalue().strip()
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LOG.debug('Alembic command `%s` returns: %s' % (alembic_command, res))
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session.cleanup()
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return res
|
|
|
|
def _get_alembic_versions(self, engine):
|
|
"""For support of full testing of migrations
|
|
we should have an opportunity to run command step by step for each
|
|
version in repo. This method returns list of alembic_versions by
|
|
historical order.
|
|
"""
|
|
full_history = self._alembic_command('history',
|
|
engine, self.ALEMBIC_CONFIG)
|
|
# The piece of output data with version can looked as:
|
|
# 'Rev: 17738166b91 (head)' or 'Rev: 43b1a023dfaa'
|
|
alembic_history = [r.split(' ')[1] for r in full_history.split("\n")
|
|
if r.startswith("Rev")]
|
|
alembic_history.reverse()
|
|
return alembic_history
|
|
|
|
def _up_and_down_versions(self, engine):
|
|
"""Since alembic version has a random algoritm of generation
|
|
(SA-migrate has an ordered autoincrement naming) we should store
|
|
a tuple of versions (version for upgrade and version for downgrade)
|
|
for successfull testing of migrations in up>down>up mode.
|
|
"""
|
|
versions = self._get_alembic_versions(engine)
|
|
return zip(versions, ['-1'] + versions)
|
|
|
|
def _walk_versions(self, engine=None, snake_walk=False,
|
|
downgrade=True):
|
|
# Determine latest version script from the repo, then
|
|
# upgrade from 1 through to the latest, with no data
|
|
# in the databases. This just checks that the schema itself
|
|
# upgrades successfully.
|
|
|
|
self._configure(engine)
|
|
up_and_down_versions = self._up_and_down_versions(engine)
|
|
for ver_up, ver_down in up_and_down_versions:
|
|
# upgrade -> downgrade -> upgrade
|
|
self._migrate_up(engine, ver_up, with_data=True)
|
|
if snake_walk:
|
|
downgraded = self._migrate_down(engine,
|
|
ver_down,
|
|
with_data=True,
|
|
next_version=ver_up)
|
|
if downgraded:
|
|
self._migrate_up(engine, ver_up)
|
|
|
|
if downgrade:
|
|
# Now walk it back down to 0 from the latest, testing
|
|
# the downgrade paths.
|
|
up_and_down_versions.reverse()
|
|
for ver_up, ver_down in up_and_down_versions:
|
|
# downgrade -> upgrade -> downgrade
|
|
downgraded = self._migrate_down(engine,
|
|
ver_down, next_version=ver_up)
|
|
|
|
if snake_walk and downgraded:
|
|
self._migrate_up(engine, ver_up)
|
|
self._migrate_down(engine, ver_down, next_version=ver_up)
|
|
|
|
def _get_version_from_db(self, engine):
|
|
"""For each type of migrate repo latest version from db
|
|
will be returned.
|
|
"""
|
|
conn = engine.connect()
|
|
try:
|
|
context = migration.MigrationContext.configure(conn)
|
|
version = context.get_current_revision() or '-1'
|
|
finally:
|
|
conn.close()
|
|
return version
|
|
|
|
def _migrate(self, engine, version, cmd):
|
|
"""Base method for manipulation with migrate repo.
|
|
It will upgrade or downgrade the actual database.
|
|
"""
|
|
|
|
self._alembic_command(cmd, engine, self.ALEMBIC_CONFIG, version)
|
|
|
|
def _migrate_down(self, engine, version, with_data=False,
|
|
next_version=None):
|
|
try:
|
|
self._migrate(engine, version, 'downgrade')
|
|
except NotImplementedError:
|
|
# NOTE(sirp): some migrations, namely release-level
|
|
# migrations, don't support a downgrade.
|
|
return False
|
|
self.assertEqual(version, self._get_version_from_db(engine))
|
|
|
|
# NOTE(sirp): `version` is what we're downgrading to (i.e. the 'target'
|
|
# version). So if we have any downgrade checks, they need to be run for
|
|
# the previous (higher numbered) migration.
|
|
if with_data:
|
|
post_downgrade = getattr(
|
|
self, "_post_downgrade_%s" % next_version, None)
|
|
if post_downgrade:
|
|
post_downgrade(engine)
|
|
|
|
return True
|
|
|
|
def _migrate_up(self, engine, version, with_data=False):
|
|
"""migrate up to a new version of the db.
|
|
|
|
We allow for data insertion and post checks at every
|
|
migration version with special _pre_upgrade_### and
|
|
_check_### functions in the main test.
|
|
"""
|
|
# NOTE(sdague): try block is here because it's impossible to debug
|
|
# where a failed data migration happens otherwise
|
|
check_version = version
|
|
try:
|
|
if with_data:
|
|
data = None
|
|
pre_upgrade = getattr(
|
|
self, "_pre_upgrade_%s" % check_version, None)
|
|
if pre_upgrade:
|
|
data = pre_upgrade(engine)
|
|
self._migrate(engine, version, 'upgrade')
|
|
self.assertEqual(version, self._get_version_from_db(engine))
|
|
if with_data:
|
|
check = getattr(self, "_check_%s" % check_version, None)
|
|
if check:
|
|
check(engine, data)
|
|
except Exception:
|
|
LOG.error("Failed to migrate to version %s on engine %s" %
|
|
(version, engine))
|
|
raise
|