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#!/opt/cloudlinux/venv/bin/python3 -bb
# coding=utf-8
#
# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2019 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT
from __future__ import print_function
from __future__ import absolute_import
import os
try:
from alembic.migration import MigrationContext
from alembic import config, command, script
except ImportError as e:
if __name__ == '__main__':
# show message end exit if run as script
print(f'Alembic Python library is not installed. Error: {e}')
exit(1)
else:
raise
ALEMBIC_CONF = os.path.join(os.path.dirname(__file__), 'alembic.ini')
def generate_revisions_chain(alembic_cfg):
chain_ = list()
script_ = script.ScriptDirectory.from_config(alembic_cfg)
revision_pairs = {s.down_revision or 'base': s.revision for s in
script_.walk_revisions()}
curent_revision = 'base'
while curent_revision:
chain_.append(curent_revision)
curent_revision = revision_pairs.get(curent_revision)
return chain_
def get_database_version(engine):
connection = engine.connect()
context = MigrationContext.configure(connection)
current_rev = context.get_current_revision()
return current_rev or 'base'
def migration_way(alembic_cfg, revision_from, revision_to):
"""
Check need migrate or downgrade to specific revisions
:return bool: True - upgrade; False downgrade
"""
rev_chain = generate_revisions_chain(alembic_cfg)
return rev_chain.index(revision_from) <= rev_chain.index(revision_to)
def correct_script_location(alembic_cfg):
"""
correct script_location in alembic config for relative path support
:param alembic_cfg:
:return:
"""
location = alembic_cfg.get_section_option('alembic', 'script_location')
here = alembic_cfg.get_section_option('alembic', 'here')
location_corrected = os.path.abspath(os.path.join(here, location))
alembic_cfg.set_section_option(
'alembic', 'script_location', location_corrected)
return alembic_cfg
def get_orm_version():
alembic_version = getattr(
__import__('lvestats.orm', fromlist=['alembic_version']),
'alembic_version', 'base')
return alembic_version
def alembic_migrate(engine, alembic_version=None, stamp=False, lve_stats_cfg=None):
if alembic_version is None:
alembic_version = get_orm_version()
alembic_cfg = correct_script_location(config.Config(ALEMBIC_CONF))
alembic_cfg.attributes['lve-stats'] = lve_stats_cfg # pylint: disable=unsupported-assignment-operation
with engine.begin() as connection:
alembic_cfg.attributes['connection'] = connection # pylint: disable=unsupported-assignment-operation
if stamp:
# write revision version to database only
command.stamp(alembic_cfg, alembic_version)
else:
database_version = get_database_version(engine)
if migration_way(alembic_cfg, database_version, alembic_version):
command.upgrade(alembic_cfg, alembic_version)
else:
command.downgrade(alembic_cfg, alembic_version)
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