587 lines
23 KiB
Python
587 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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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 six.moves.urllib.parse as urlparse
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import sqlalchemy
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import sqlalchemy.exc
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import testtools
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import sahara.db.migration
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from sahara.db.sqlalchemy import api as sa
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from sahara.openstack.common import lockutils
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from sahara.openstack.common import log as logging
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from sahara.openstack.common import processutils
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LOG = logging.getLogger(__name__)
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CONF = cfg.CONF
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synchronized = lockutils.synchronized_with_prefix('sahara-')
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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('SAHARA_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('SAHARA_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 TestSaharaMigrations 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(testtools.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 SAHARA_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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'SAHARA_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(sahara.db.migration.__file__),
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'alembic.ini')
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)
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self.ALEMBIC_CONFIG.sahara_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 -e \"%(sql)s\""
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% {'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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sa.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(
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"mysql", self.USER, self.PASSWD, 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(
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"postgres", self.USER, 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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sa.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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sa.cleanup()
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return res
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def _get_alembic_versions(self, engine):
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"""For support of full testing of migrations
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we should have an opportunity to run command step by step for each
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version in repo. This method returns list of alembic_versions by
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historical order.
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"""
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full_history = self._alembic_command('history',
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engine, self.ALEMBIC_CONFIG)
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# The piece of output data with version can looked as:
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# 'Rev: 17738166b91 (head)' or 'Rev: 43b1a023dfaa'
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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 algorithm of generation
|
|
(SA-migrate has an ordered autoincrement naming) we should store
|
|
a tuple of versions (version for upgrade and version for downgrade)
|
|
for successful 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
|