def _migrate_down(self, engine, version):
migration_api.downgrade(engine,
TestMigrations.REPOSITORY,
version)
self.assertEqual(version,
migration_api.db_version(engine,
TestMigrations.REPOSITORY))
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 _prerun_### 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
try:
if with_data:
data = None
prerun = getattr(self, "_prerun_%3.3d" % version, None)
if prerun:
data = prerun(engine)
migration_api.upgrade(engine,
TestMigrations.REPOSITORY,
version)
self.assertEqual(
version,
migration_api.db_version(engine,
TestMigrations.REPOSITORY))
if with_data:
check = getattr(self, "_check_%3.3d" % version, None)
if check:
check(engine, data)
except Exception:
LOG.error("Failed to migrate to version %s on engine %s" %
(version, engine))
raise
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.
# Place the database under version control
migration_api.version_control(engine,
TestMigrations.REPOSITORY,
migration.INIT_VERSION)
self.assertEqual(migration.INIT_VERSION,
migration_api.db_version(engine,
TestMigrations.REPOSITORY))
migration_api.upgrade(engine, TestMigrations.REPOSITORY,
migration.INIT_VERSION + 1)
LOG.debug('latest version is %s' % TestMigrations.REPOSITORY.latest)
for version in xrange(migration.INIT_VERSION + 2,
TestMigrations.REPOSITORY.latest + 1):
# upgrade -> downgrade -> upgrade
self._migrate_up(engine, version, with_data=True)
if snake_walk:
self._migrate_down(engine, version - 1)
self._migrate_up(engine, version)
if downgrade:
# Now walk it back down to 0 from the latest, testing
# the downgrade paths.
for version in reversed(
xrange(migration.INIT_VERSION + 1,
TestMigrations.REPOSITORY.latest)):
# downgrade -> upgrade -> downgrade
self._migrate_down(engine, version)
if snake_walk:
self._migrate_up(engine, version + 1)
self._migrate_down(engine, version)