VNFFG abstract driver

Implements: blueprint tacker-vnffg

Abstract driver interface for VNFFG.  Driver implementation should be
done in this same folder, then inherited into respective VIM driver.

Change-Id: Ifa6f587d42e48cc079a8d5f439ee5fe00a071c8e
Signed-off-by: Tim Rozet <trozet@redhat.com>

tacker/nfvo/drivers/vnffg/abstract_vnffg_driver.py

@@ -0,0 +1,67 @@
+#    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.
+
+import abc
+
+import six
+
+from tacker.api import extensions
+
+
+@six.add_metaclass(abc.ABCMeta)
+class VnffgAbstractDriver(extensions.PluginInterface):
+
+    @abc.abstractmethod
+    def get_type(self):
+        """Return one of predefined type of Tacker drivers."""
+        pass
+
+    @abc.abstractmethod
+    def get_name(self):
+        """Return a symbolic name for the Tacker VNFFG SFC driver."""
+        pass
+
+    @abc.abstractmethod
+    def get_description(self):
+        pass
+
+    @abc.abstractmethod
+    def create_chain(self, fc_id, vnfs, symmetrical=False, auth_attr=None):
+        """Create service function chain and returns an ID"""
+        pass
+
+    @abc.abstractmethod
+    def update_chain(self, chain_id, fc_ids, vnfs, symmetrical=False,
+                     auth_attr=None):
+        """Update service function chain"""
+        pass
+
+    @abc.abstractmethod
+    def delete_chain(self, chain_id, auth_attr=None):
+        """Delete service function chain"""
+        pass
+
+    @abc.abstractmethod
+    def create_flow_classifier(self, fc, symmetrical=False, auth_attr=None):
+        """Create flow classifier and returns an ID"""
+        pass
+
+    @abc.abstractmethod
+    def update_flow_classifier(self, fc_id, fc, symmetrical=False,
+                               auth_attr=None):
+        """Update flow classifier"""
+        pass
+
+    @abc.abstractmethod
+    def delete_flow_classifier(self, fc_id, auth_attr=None):
+        """Delete flow classifier"""
+        pass