Rename DB columns: tenant -> project

All occurences of ``tenant_id`` across the neutron database are
being renamed to ``project_id``.

This neutron_taas change accompanies the neutron change:
I87a8ef342ccea004731ba0192b23a8e79bc382dc

Change-Id: I71087973031ebe479bbd13e3af6cd079174e28cb
Related Blueprint: keystone-v3
Closes-Bug: #1522645

neutron_taas/db/migration/alembic_migration/versions/CONTRACT_HEAD

@@ -1 +1 @@
-2ecce0368a62
+4086b3cffc01

neutron_taas/db/migration/alembic_migration/versions/newton/contract/4086b3cffc01_rename_tenant_to_project.py

@@ -0,0 +1,120 @@
+# Copyright 2016 OpenStack Foundation
+#
+#    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.
+#
+
+"""rename tenant to project
+
+Revision ID: 4086b3cffc01
+Revises: 2ecce0368a62
+Create Date: 2016-07-30 22:09:16.372917
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '4086b3cffc01'
+down_revision = '2ecce0368a62'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+from sqlalchemy.engine import reflection
+
+
+_INSPECTOR = None
+
+
+def get_inspector():
+    """Reuse inspector."""
+
+    global _INSPECTOR
+
+    if _INSPECTOR:
+        return _INSPECTOR
+
+    else:
+        bind = op.get_bind()
+        _INSPECTOR = reflection.Inspector.from_engine(bind)
+
+    return _INSPECTOR
+
+
+def get_tables():
+    """Returns hardcoded list of tables which have ``tenant_id`` column.
+
+    The list is hard-coded to match the state of the schema when this upgrade
+    script is run.
+    """
+
+    tables = [
+        'tap_services',
+        'tap_flows',
+    ]
+
+    return tables
+
+
+def get_columns(table):
+    """Returns list of columns for given table."""
+    inspector = get_inspector()
+    return inspector.get_columns(table)
+
+
+def get_data():
+    """Returns combined list of tuples: [(table, column)].
+
+    The list is built from tables with a tenant_id column.
+    """
+
+    output = []
+    tables = get_tables()
+    for table in tables:
+        columns = get_columns(table)
+
+        for column in columns:
+            if column['name'] == 'tenant_id':
+                output.append((table, column))
+
+    return output
+
+
+def alter_column(table, column):
+    old_name = 'tenant_id'
+    new_name = 'project_id'
+
+    op.alter_column(
+        table_name=table,
+        column_name=old_name,
+        new_column_name=new_name,
+        existing_type=column['type'],
+        existing_nullable=column['nullable']
+    )
+
+
+def upgrade():
+    data = get_data()
+    for table, column in data:
+        alter_column(table, column)
+
+
+def contract_creation_exceptions():
+    """Special migration for the blueprint to support Keystone V3.
+
+    We drop all tenant_id columns and create project_id columns instead.
+    """
+
+    return {
+        sa.Column: ['.'.join([table, 'project_id']) for table in get_tables()],
+        sa.Index: get_tables()
+    }

neutron_taas/db/taas_db.py

@@ -14,37 +14,36 @@
 # under the License.
 
 
-from neutron.api.v2 import attributes as attr
+import sqlalchemy as sa
+from sqlalchemy import orm
+from sqlalchemy.orm import exc
+
 from neutron.db import common_db_mixin as base_db
 from neutron.db import model_base
-from neutron.db import models_v2
 from neutron import manager
 from neutron_taas.extensions import taas
 from oslo_log import log as logging
 from oslo_utils import uuidutils
-import sqlalchemy as sa
-from sqlalchemy import orm
-from sqlalchemy.orm import exc
 
 
 LOG = logging.getLogger(__name__)
 
 
-class TapService(model_base.BASEV2, models_v2.HasId):
+class TapService(model_base.BASEV2, model_base.HasId,
+                 model_base.HasProjectNoIndex):
 
     # Represents a V2 TapService Object
     __tablename__ = 'tap_services'
-    tenant_id = sa.Column(sa.String(attr.TENANT_ID_MAX_LEN))
     name = sa.Column(sa.String(255), nullable=True)
     description = sa.Column(sa.String(1024), nullable=True)
     port_id = sa.Column(sa.String(36), nullable=False)
 
 
-class TapFlow(model_base.BASEV2, models_v2.HasId):
+class TapFlow(model_base.BASEV2, model_base.HasId,
+              model_base.HasProjectNoIndex):
 
     # Represents a V2 TapFlow Object
     __tablename__ = 'tap_flows'
-    tenant_id = sa.Column(sa.String(attr.TENANT_ID_MAX_LEN))
     name = sa.Column(sa.String(255), nullable=True)
     description = sa.Column(sa.String(1024), nullable=True)
     tap_service_id = sa.Column(sa.String(36),