Fixes querying alarm history with severity field

Querying alarm-history with the severity field
fails with a 500 error as the storage model has
no severity field.

This fix adds the severity field to AlarmHistory
table and model and allows search on severity field.

Change-Id: I4a374d324c7e1bde566e26daf7092fd325f33625
Closes-Bug: 1473046

aodh/api/controllers/v2/alarms.py

@@ -525,6 +525,7 @@ class AlarmController(rest.RestController):
         user_id = pecan.request.headers.get('X-User-Id')
         project_id = pecan.request.headers.get('X-Project-Id')
         on_behalf_of = on_behalf_of or project_id
+        severity = scrubbed_data.get('severity')
         payload = dict(event_id=str(uuid.uuid4()),
                        alarm_id=self._id,
                        type=type,
@@ -532,7 +533,8 @@ class AlarmController(rest.RestController):
                        user_id=user_id,
                        project_id=project_id,
                        on_behalf_of=on_behalf_of,
-                       timestamp=now)
+                       timestamp=now,
+                       severity=severity)
 
         try:
             self.conn.record_alarm_change(payload)
@@ -702,6 +704,7 @@ class AlarmsController(rest.RestController):
         detail = json.dumps(scrubbed_data)
         user_id = pecan.request.headers.get('X-User-Id')
         project_id = pecan.request.headers.get('X-Project-Id')
+        severity = scrubbed_data.get('severity')
         payload = dict(event_id=str(uuid.uuid4()),
                        alarm_id=alarm_id,
                        type=type,
@@ -709,7 +712,8 @@ class AlarmsController(rest.RestController):
                        user_id=user_id,
                        project_id=project_id,
                        on_behalf_of=project_id,
-                       timestamp=now)
+                       timestamp=now,
+                       severity=severity)
 
         try:
             conn.record_alarm_change(payload)

aodh/storage/sqlalchemy/alembic/versions/bb07adac380_add_severity_to_alarm_history.py

@@ -0,0 +1,36 @@
+# Copyright 2015 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 severity to alarm history
+
+Revision ID: bb07adac380
+Revises: 12fe8fac9fe4
+Create Date: 2015-08-06 15:15:43.717068
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = 'bb07adac380'
+down_revision = '12fe8fac9fe4'
+branch_labels = None
+depends_on = None
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    op.add_column('alarm_history',
+                  sa.Column('severity', sa.String(length=50), nullable=True))

aodh/storage/sqlalchemy/models.py

@@ -143,3 +143,4 @@ class AlarmChange(Base):
     type = Column(String(20))
     detail = Column(Text)
     timestamp = Column(PreciseTimestamp, default=lambda: timeutils.utcnow())
+    severity = Column(String(50))

aodh/tests/api/v2/test_alarm_scenarios.py

@@ -1992,6 +1992,15 @@ class TestAlarmsHistory(TestAlarmsBase):
         self.assertEqual(msg,
                          resp.json['error_message']['faultstring'])
 
+    def test_get_alarm_history_constrained_by_severity(self):
+        alarm = self._get_alarm('a')
+        self._update_alarm(alarm, dict(severity='low'))
+        query = dict(field='severity', op='eq', value='low')
+        history = self._get_alarm_history('a', query=query)
+        self.assertEqual(1, len(history))
+        self.assertEqual(jsonutils.dumps({'severity': 'low'}),
+                         history[0]['detail'])
+
     def test_get_nonexistent_alarm_history(self):
         # the existence of alarm history is independent of the
         # continued existence of the alarm itself