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# Copyright (C) 2015-2017 by the Free Software Foundation, Inc.
#
# This file is part of GNU Mailman.
#
# GNU Mailman is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# GNU Mailman is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
# more details.
#
# You should have received a copy of the GNU General Public License along with
# GNU Mailman. If not, see <http://www.gnu.org/licenses/>.
"""Migration from Python 2 to Python 3.
Some columns changed from LargeBinary type to Unicode type.
Revision ID: 33e1f5f6fa8
Revises: 51b7f92bd06c
Create Date: 2015-01-20 17:32:30.144083
"""
import sqlalchemy as sa
from alembic import op
from mailman.database.helpers import is_sqlite
from mailman.database.types import SAUnicode
# Revision identifiers, used by Alembic.
revision = '33e1f5f6fa8'
down_revision = '51b7f92bd06c'
COLUMNS_TO_CHANGE = (
('message', 'message_id_hash'),
('message', 'path'),
('pended', 'token'),
('_request', 'data_hash'),
('user', 'password'),
)
def upgrade():
if is_sqlite(op.get_bind()):
# SQLite does not support altering columns.
return
for table, column in COLUMNS_TO_CHANGE:
op.alter_column(table, column, type_=SAUnicode)
def downgrade():
if is_sqlite(op.get_bind()):
# SQLite does not support altering columns.
return
for table, column in COLUMNS_TO_CHANGE:
if op.get_bind().dialect.name == 'postgresql':
# PostgreSQL needs the USING clause that Alembic does not support
# yet.
op.execute(
('ALTER TABLE "{table}" ALTER COLUMN "{column}" '
'TYPE BYTEA USING decode("{column}", \'UTF8\')').format(
table=table, column=column))
else:
op.alter_column(table, column, type_=sa.LargeBinary)
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