Add alembic migration

Partial-Bug: #1501793
Partial-Bug: #1501795
Change-Id: If41d368a8d9303952755a1f4762753abdc046c43

neutron_taas/db/migration/alembic_migration/README

@@ -0,0 +1 @@
+Generic single-database configuration.

neutron_taas/db/migration/alembic_migration/env.py

@@ -0,0 +1,86 @@
+# Copyright 2015 Midokura SARL
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from logging import config as logging_config
+
+from alembic import context
+from neutron.db import model_base
+from oslo_config import cfg
+from oslo_db.sqlalchemy import session
+import sqlalchemy as sa
+from sqlalchemy import event
+
+
+MYSQL_ENGINE = None
+TAAS_VERSION_TABLE = 'alembic_version_taas'
+config = context.config
+neutron_config = config.neutron_config
+logging_config.fileConfig(config.config_file_name)
+target_metadata = model_base.BASEV2.metadata
+
+
+def set_mysql_engine():
+    try:
+        mysql_engine = neutron_config.command.mysql_engine
+    except cfg.NoSuchOptError:
+        mysql_engine = None
+
+    global MYSQL_ENGINE
+    MYSQL_ENGINE = (mysql_engine or
+                    model_base.BASEV2.__table_args__['mysql_engine'])
+
+
+def run_migrations_offline():
+    set_mysql_engine()
+
+    kwargs = dict()
+    if neutron_config.database.connection:
+        kwargs['url'] = neutron_config.database.connection
+    else:
+        kwargs['dialect_name'] = neutron_config.database.engine
+    kwargs['version_table'] = TAAS_VERSION_TABLE
+    context.configure(**kwargs)
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+@event.listens_for(sa.Table, 'after_parent_attach')
+def set_storage_engine(target, parent):
+    if MYSQL_ENGINE:
+        target.kwargs['mysql_engine'] = MYSQL_ENGINE
+
+
+def run_migrations_online():
+    set_mysql_engine()
+    engine = session.create_engine(neutron_config.database.connection)
+
+    connection = engine.connect()
+    context.configure(
+        connection=connection,
+        target_metadata=target_metadata,
+        version_table=TAAS_VERSION_TABLE
+    )
+    try:
+        with context.begin_transaction():
+            context.run_migrations()
+    finally:
+        connection.close()
+        engine.dispose()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

neutron_taas/db/migration/alembic_migration/script.py.mako

@@ -0,0 +1,18 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision}
+Create Date: ${create_date}
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+def upgrade():
+    ${upgrades if upgrades else "pass"}

neutron_taas/db/migration/alembic_migration/versions/start_neutron_taas.py

@@ -0,0 +1,32 @@
+# Copyright 2015 Midokura SARL
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""start neutron-taas chain
+
+Revision ID: start_neutron_taas
+Revises: None
+Create Date: 2015-11-11 02:36:00.209301
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = 'start_neutron_taas'
+down_revision = None
+
+
+from neutron_taas.db.migration import taas_init_ops
+
+
+def upgrade():
+    taas_init_ops.upgrade()

setup.cfg

@@ -50,3 +50,5 @@ console_scripts =
     neutron-taas-openvswitch-agent = neutron_taas.services.taas.agents.ovs.agent:main
 neutron.service_plugins =
     taas = neutron_taas.services.taas.taas_plugin:TaasPlugin
+neutron.db.alembic_migrations =
+    tap-as-a-service = neutron_taas.db.migration:alembic_migration