Introduce DPMVIF object

The DPMVIF object represents a VIF (virtual interface for networking).
Nova provides us a large dictionary. This object provides a better method
to access properties of a vif.

Change-Id: I1e6c408c244330d9e59b988aecacce82e2c07b8e

nova_dpm/tests/unit/virt/dpm/test_vif.py

@@ -0,0 +1,51 @@
+# Copyright 2018 IBM Corp. All Rights Reserved.
+#
+# 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 nova.test import TestCase
+
+from nova_dpm.virt.dpm.vif import DPMVIF
+
+VIF_DICT = {
+    "details":
+        {"port_filter": False,
+         "object_id": "3ea09d2a-b18d-11e6-89a4-42f2e9ef1641"},
+    "address": "fa:16:3e:e4:9a:98",
+    "type": "dpm_vswitch",
+    "id": "703da361-9d4d-4441-b99b-e081c3e9cfbb"}
+
+
+class DPMVIFTestCase(TestCase):
+
+    def setUp(self):
+        super(DPMVIFTestCase, self).setUp()
+        self.vif_obj = DPMVIF(VIF_DICT)
+
+    def test_get_port_id(self):
+        self.assertEqual('703da361-9d4d-4441-b99b-e081c3e9cfbb',
+                         self.vif_obj.port_id)
+
+    def test_get_type(self):
+        self.assertEqual('dpm_vswitch', self.vif_obj.type)
+
+    def test_get_mac(self):
+        self.assertEqual('fa:16:3e:e4:9a:98', self.vif_obj. mac)
+
+    def test_get_details(self):
+        details = {"port_filter": False,
+                   "object_id": "3ea09d2a-b18d-11e6-89a4-42f2e9ef1641"}
+        self.assertEqual(details, self.vif_obj.details)
+
+    def test_get_dpm_nic_object_id(self):
+        self.assertEqual('3ea09d2a-b18d-11e6-89a4-42f2e9ef1641',
+                         self.vif_obj.dpm_nic_object_id)

nova_dpm/virt/dpm/vif.py

@@ -0,0 +1,39 @@
+# Copyright 2018 IBM Corp. All Rights Reserved.
+#
+# 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.
+
+
+class DPMVIF(object):
+    def __init__(self, vif):
+        # The vif dictionary
+        self.vif = vif
+
+    @property
+    def port_id(self):
+        return self.vif['id']
+
+    @property
+    def type(self):
+        return self.vif['type']
+
+    @property
+    def mac(self):
+        return self.vif['address']
+
+    @property
+    def details(self):
+        return self.vif['details']
+
+    @property
+    def dpm_nic_object_id(self):
+        return self.details['object_id']