add rca api

Change-Id: I6c1301fbabd13e31b1a845e4e32fa4a8b6c147da

etc/vitrage/policy.json

@@ -2,5 +2,6 @@
   "get topology": "role:admin",
   "get resource": "role:admin",
   "list resources": "role:admin",
-  "list alarms": "role:admin"
+  "list alarms": "role:admin",
+  "get rca": "role:admin"
 }

vitrage/api/controllers/v1/rca.py

@@ -0,0 +1,37 @@
+# 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 pecan
+
+from oslo_log import log
+from pecan import rest
+from vitrage.api.policy import enforce
+# noinspection PyProtectedMember
+from vitrage.i18n import _LI
+
+LOG = log.getLogger(__name__)
+
+
+class RCAController(rest.RestController):
+    @pecan.expose('json')
+    def get(self, alarm_id):
+        enforce("get rca", pecan.request.headers,
+                pecan.request.enforcer, {})
+
+        LOG.info(_LI('received show rca with alarm id %s') %
+                 alarm_id)
+        pecan.request.context = dict(query=None, depth=None, root=None,
+                                     graph_type="graph")
+        # todo (eyalb1) need to figure how to redirect
+        # redirect('/v1/topology/', internal=True)

vitrage/api/controllers/v1/root.py

@@ -11,6 +11,7 @@
 # under the License.
 
 from vitrage.api.controllers.v1 import alarms
+from vitrage.api.controllers.v1 import rca
 from vitrage.api.controllers.v1 import resource
 from vitrage.api.controllers.v1 import topology
 
@@ -19,3 +20,4 @@ class V1Controller(object):
     topology = topology.TopologyController()
     resources = resource.ResourcesController()
     alarms = alarms.AlarmsController()
+    rca = rca.RCAController()