Function aliases: db scheme change

Spec reference:
https://docs.openstack.org/qinling/latest/specs/function_aliases.html

Change-Id: Icd209d44e1b20465e0c7c69657e638ceb294a4e7
story: #2002143
task: #19983

qinling/db/sqlalchemy/migration/alembic_migrations/versions/004_add_function_aliases_support.py

@@ -0,0 +1,54 @@
+# Copyright 2018 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.
+
+"""add function aliases support
+
+Revision ID: 004
+Revises: 003
+Create Date: 2018-05-17 03:09:04.888969
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '004'
+down_revision = '003'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    op.create_table(
+        'function_aliases',
+        sa.Column('created_at', sa.DateTime(), nullable=True),
+        sa.Column('updated_at', sa.DateTime(), nullable=True),
+        sa.Column('project_id', sa.String(length=80), nullable=False),
+        sa.Column('id', sa.String(length=36), nullable=False),
+        sa.Column('name', sa.String(length=255), nullable=False),
+        sa.Column('function_id', sa.String(length=36), nullable=False),
+        sa.Column('function_version', sa.Integer, nullable=False),
+        sa.Column('description', sa.String(length=255), nullable=True),
+        sa.PrimaryKeyConstraint('id'),
+        sa.ForeignKeyConstraint(['function_id'], [u'functions.id']),
+        sa.UniqueConstraint('function_id', 'function_version', 'project_id'),
+        sa.UniqueConstraint('name', 'project_id'),
+        sa.Index(
+            'function_aliases_project_id_function_id_function_version',
+            'project_id', 'function_id', 'function_version'
+        ),
+        sa.Index(
+            'function_aliases_project_id_name',
+            'project_id', 'name'
+        )
+    )

qinling/db/sqlalchemy/models.py

@@ -119,6 +119,34 @@ class FunctionVersion(model_base.QinlingSecureModelBase):
     count = sa.Column(sa.Integer, default=0)
 
 
+class FunctionAlias(model_base.QinlingSecureModelBase):
+    __tablename__ = 'function_aliases'
+
+    __table_args__ = (
+        sa.UniqueConstraint('project_id', 'function_id', 'function_version'),
+        sa.Index(
+            '%s_project_id_function_id_function_version' % __tablename__,
+            'project_id',
+            'function_id',
+            'function_version'
+        ),
+        sa.UniqueConstraint('project_id', 'name'),
+        sa.Index(
+            '%s_project_id_name' % __tablename__,
+            'project_id',
+            'name'
+        )
+    )
+
+    function_id = sa.Column(
+        sa.String(36),
+        sa.ForeignKey(Function.id)
+    )
+    name = sa.Column(sa.String(255), nullable=False)
+    description = sa.Column(sa.String(255), nullable=True)
+    function_version = sa.Column(sa.Integer, default=0)
+
+
 # Only get running jobs
 Function.jobs = relationship(
     "Job",