OpenStack Study: 013_drop_legacy_endpoints.py

**** CubicPower OpenStack Study ****

def upgrade(migrate_engine):

    """Replace API-version specific endpoint tables with one based on v3."""

    meta = sql.MetaData()

    meta.bind = migrate_engine

    legacy_table = sql.Table('endpoint_v2', meta, autoload=True)

    legacy_table.drop()

    new_table = sql.Table('endpoint_v3', meta, autoload=True)

    renames = {'endpoint': new_table}

    service_table = sql.Table('service', meta, autoload=True)

    constraints = [{'table': new_table,

                    'fk_column': 'service_id',

                    'ref_column': service_table.c.id}]

    migration_helpers.rename_tables_with_constraints(renames, constraints,

                                                     migrate_engine)

**** CubicPower OpenStack Study ****

def downgrade(migrate_engine):

    """Create API-version specific endpoint tables."""

    meta = sql.MetaData()

    meta.bind = migrate_engine

    new_table = sql.Table('endpoint', meta, autoload=True)

    renames = {'endpoint_v3': new_table}

    service_table = sql.Table('service', meta, autoload=True)

    constraints = [{'table': new_table,

                    'fk_column': 'service_id',

                    'ref_column': service_table.c.id}]

    migration_helpers.rename_tables_with_constraints(renames, constraints,

                                                     migrate_engine)

    sql.Table('service', meta, autoload=True)

    legacy_table = sql.Table(

        'endpoint_v2',

        meta,

        sql.Column('id', sql.String(64), primary_key=True),

        sql.Column('region', sql.String(255)),

        sql.Column('service_id',

                   sql.String(64),

                   sql.ForeignKey('service.id'),

                   nullable=False),

        sql.Column('extra', sql.Text()))

    legacy_table.create(migrate_engine, checkfirst=True)