Add 'host' field to Pod object.

K8s Pod has a 'host' field that shows the IP address of the Pod.
This field is useful and should be copied to Magnum Pod.

Change-Id: Iab8a0279561d62fd429f3427ac971aa457568f52
Closes-Bug: 1467526
Partially-Implements: blueprint magnum-smart-bay-scale-down

magnum/api/controllers/v1/pod.py

@@ -55,6 +55,9 @@ class Pod(v1_base.K8sResourceBase):
     links = wsme.wsattr([link.Link], readonly=True)
     """A list containing a self link and associated pod links"""
 
+    host = wtypes.text
+    """The host of this pod"""
+
     def __init__(self, **kwargs):
         super(Pod, self).__init__()
 
@@ -70,7 +73,7 @@ class Pod(v1_base.K8sResourceBase):
     def _convert_with_links(pod, url, expand=True):
         if not expand:
             pod.unset_fields_except(['uuid', 'name', 'desc', 'bay_uuid',
-                                     'images', 'labels', 'status'])
+                                     'images', 'labels', 'status', 'host'])
 
         pod.links = [link.Link.make_link('self', url,
                                          'pods', pod.uuid),
@@ -94,6 +97,7 @@ class Pod(v1_base.K8sResourceBase):
                      images=['MyImage'],
                      labels={'name': 'foo'},
                      status='Running',
+                     host='10.0.0.3',
                      manifest_url='file:///tmp/rc.yaml',
                      manifest = '''{
                          "metadata": {

magnum/conductor/handlers/k8s_conductor.py

@@ -176,6 +176,7 @@ class Handler(object):
             message = ast.literal_eval(err.read())['message']
             raise exception.KubernetesAPIFailed(code=err.code, message=message)
         pod.status = resp.status.phase
+        pod.host = resp.spec.host
         # call the pod object to persist in db
         # TODO(yuanying): parse pod file and,
         # - extract pod name and set it

magnum/db/sqlalchemy/alembic/versions/53882537ac57_add_host_column_to_pod.py

@@ -0,0 +1,32 @@
+# Copyright 2015 Huawei Technologies Co.,LTD.
+#
+# 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 host column to pod
+
+Revision ID: 53882537ac57
+Revises: 1c1ff5e56048
+Create Date: 2015-06-25 16:52:47.159887
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '53882537ac57'
+down_revision = '1c1ff5e56048'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    op.add_column('pod',
+                  sa.Column('host', sa.Text, nullable=True))

magnum/db/sqlalchemy/models.py

@@ -229,6 +229,7 @@ class Pod(Base):
     status = Column(String(255))
     project_id = Column(String(255))
     user_id = Column(String(255))
+    host = Column(String(255))
 
 
 class Service(Base):

magnum/objects/pod.py

@@ -40,6 +40,7 @@ class Pod(base.MagnumPersistentObject, base.MagnumObject,
         'status': fields.StringField(nullable=True),
         'manifest_url': fields.StringField(nullable=True),
         'manifest': fields.StringField(nullable=True),
+        'host': fields.StringField(nullable=True),
     }
 
     @staticmethod

magnum/tests/unit/api/controllers/v1/test_pod.py

@@ -48,7 +48,8 @@ class TestListPod(api_base.FunctionalTest):
         self.assertEqual([], response['pods'])
 
     def _assert_pod_fields(self, pod):
-        pod_fields = ['name', 'bay_uuid', 'desc', 'images', 'labels', 'status']
+        pod_fields = ['name', 'bay_uuid', 'desc', 'images', 'labels',
+                      'status', 'host']
         for field in pod_fields:
             self.assertIn(field, pod)
 

magnum/tests/unit/conductor/handlers/test_k8s_conductor.py

@@ -136,10 +136,13 @@ class TestK8sConductor(base.TestCase):
             return_value = mock.MagicMock()
             return_value.status = mock.MagicMock()
             return_value.status.phase = 'Pending'
+            return_value.spec = mock.MagicMock()
+            return_value.spec.host = '10.0.0.3'
             mock_kube_api.return_value.createPod.return_value = return_value
 
             self.kube_handler.pod_create(self.context, expected_pod)
             self.assertEqual('Pending', expected_pod.status)
+            self.assertEqual('10.0.0.3', expected_pod.host)
             expected_pod.create.assert_called_once_with(self.context)
 
     @patch('magnum.conductor.handlers.k8s_conductor._retrieve_k8s_master_url')

magnum/tests/unit/db/utils.py

@@ -97,6 +97,7 @@ def get_test_pod(**kw):
         'images': kw.get('images', ['MyImage']),
         'labels': kw.get('labels', {'name': 'foo'}),
         'status': kw.get('status', 'Running'),
+        'host': kw.get('host', '10.0.0.3'),
         'created_at': kw.get('created_at'),
         'updated_at': kw.get('updated_at'),
     }