add alarms api

Change-Id: Ib3f5fa82a55fcfc1a82389a02bd7bc47b3dcfcae

etc/vitrage/policy.json

@@ -1,5 +1,6 @@
 {
   "get topology": "role:admin",
   "get resource": "role:admin",
-  "list resources": "role:admin"
+  "list resources": "role:admin",
+  "list alarms": "role:admin"
 }

vitrage/api/controllers/v1/alarms.py

@@ -0,0 +1,62 @@
+# Copyright 2016 - Nokia Corporation
+#
+# 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 json
+import pecan
+
+from oslo_log import log
+from pecan.core import abort
+from pecan import rest
+
+from vitrage.api.controllers.v1 import mock_file
+from vitrage.api.policy import enforce
+# noinspection PyProtectedMember
+from vitrage.i18n import _LI
+
+LOG = log.getLogger(__name__)
+
+
+class AlarmsController(rest.RestController):
+    @pecan.expose('json')
+    def index(self, entity_id):
+        enforce("list alarms", pecan.request.headers,
+                pecan.request.enforcer, {})
+
+        LOG.info(_LI('received list alarms with entity  is %s') %
+                 entity_id)
+
+        try:
+            if mock_file:
+                return self.get_mock_alarms()
+            else:
+                return self.get_alarms(entity_id)
+        except Exception as e:
+            LOG.exception("failed to get alarms %s", e)
+            abort(404, str(e))
+
+    @staticmethod
+    def get_mock_alarms():
+        # TODO(eyal) temporary mock
+        alarms_file = pecan.request.cfg.find_file('alarms.sample.json')
+        try:
+            with open(alarms_file) as data_file:
+                return json.load(data_file)
+
+        except Exception as e:
+            LOG.exception("failed to open file ", e)
+            abort(404, str(e))
+
+    @staticmethod
+    def get_alarms(entity_id):
+        return dict()

vitrage/api/controllers/v1/root.py

@@ -10,6 +10,7 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
+from vitrage.api.controllers.v1 import alarms
 from vitrage.api.controllers.v1 import resource
 from vitrage.api.controllers.v1 import topology
 
@@ -17,3 +18,4 @@ from vitrage.api.controllers.v1 import topology
 class V1Controller(object):
     topology = topology.TopologyController()
     resources = resource.ResourcesController()
+    alarms = alarms.AlarmsController()