def sort(self):
# The topological sort modifies inbound, but we can't do a deepcopy
# since that would deepcopy the key too.
inbound = {}
for key, depends in self.inbound.items():
inbound[key] = set(depends)
toprocess = [v for v in self.ops if not inbound[v]]
inorder = []
while toprocess:
op = toprocess.pop(0)
inorder.insert(0, op)
for depop in self.outbound[op]:
inbound[depop].remove(op)
if not inbound[depop]:
toprocess.insert(0, depop)
del inbound[op]
# Anything remaining in inbound is a dependency loop
if inbound:
msg = _('Dependency loop exists in database migrations')
raise exception.DatabaseMigrationError(reason=msg)
return inorder
def _column_changes(self, diffs):
# Column change (type, nullable, etc)
table_name = diffs[0][2]
column_name = diffs[0][3]
args = {}
for diff in diffs:
cmd = diff[0]
if cmd == 'modify_nullable':
# ('modify_nullable', None, table_name, column_name,
# {'existing_server_default': None,
# 'existing_type': VARCHAR(length=36)},
# conn_nullable, metadata_nullable)
existing_type = diff[4]['existing_type']
nullable = diff[6]
args['existing_type'] = existing_type
args['nullable'] = nullable
elif cmd == 'modify_type':
# ('modify_type', None, table_name, column_name,
# {'existing_nullable': True,
# 'existing_server_default': None},
# TINYINT(display_width=1), Boolean())
existing_nullable = diff[4]['existing_nullable']
new_type = diff[6]
if 'nullable' not in args:
args['nullable'] = existing_nullable
args['type_'] = new_type
else:
msg = _('Unknown alembic cmd %s') % cmd
raise exception.DatabaseMigrationError(reason=msg)
yield AlterColumn(table_name, column_name, args)
def db_contract(dryrun=False, database='main'):
context = _create_migration_context(as_sql=False)
expand, migrate, contract = _schedule_schema_changes(context)
if expand:
msg = _('expand phase still has operations that need to be executed')
raise exception.DatabaseMigrationError(reason=msg)
if migrate:
msg = _('migrate phase still has operations that need to be executed')
raise exception.DatabaseMigrationError(reason=msg)
context = _create_migration_context(as_sql=dryrun)
ddlop = alembic.operations.Operations(context)
for op in contract:
op.execute(ddlop)
repository = _find_migrate_repo(database)
_set_db_sync_lock(repository, locked=False)
_set_db_sync_version(repository, repository.latest)
def db_migrate(dryrun=False, database='main'):
context = _create_migration_context(as_sql=False)
expand, migrate, contract = _schedule_schema_changes(context)
if expand:
msg = _('expand phase still has operations that need to be executed')
raise exception.DatabaseMigrationError(reason=msg)
context = _create_migration_context(as_sql=dryrun)
ddlop = alembic.operations.Operations(context)
for op in migrate:
op.execute(ddlop)
def db_sync(version=None, database='main'):
if version is not None:
try:
version = int(version)
except ValueError:
raise exception.NovaException(_("version should be an integer"))
current_version = db_version(database)
repository = _find_migrate_repo(database)
if _db_sync_locked(repository):
msg = _("Cannot run 'db sync' until 'db contract' is run")
raise exception.DatabaseMigrationError(reason=msg)
if version is None or version > current_version:
return versioning_api.upgrade(get_engine(database), repository,
version)
else:
return versioning_api.downgrade(get_engine(database), repository,
version)
def convert_alembic(self, diffs):
ops = []
for diff in diffs:
# Parse out the format into something easier to use than the
# tuple/list format that alembic returns
if isinstance(diff, list):
ret = self._column_changes(diff)
else:
cmd = diff[0]
handler = getattr(self, '_handle_%s' % cmd, None)
if handler is None:
msg = _('Unknown alembic cmd %s') % cmd
raise exception.DatabaseMigrationError(reason=msg)
ret = handler(*diff[1:])
ops.extend(list(ret))
return ops
