add rca api

Change-Id: I1b7f3d2b82f9d8e96e5418af527d7d9bb63937ea

vitrage/api/controllers/v1/rca.py

@@ -15,7 +15,9 @@
 import pecan
 
 from oslo_log import log
+from pecan import redirect
 from pecan import rest
+from six.moves import urllib
 from vitrage.api.policy import enforce
 # noinspection PyProtectedMember
 from vitrage.i18n import _LI
@@ -31,7 +33,6 @@ class RCAController(rest.RestController):
 
         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)
+        params = urllib.parse.urlencode(dict(query=None, root=alarm_id,
+                                             graph_type="graph"))
+        redirect('/v1/topology?' + params, internal=True)

vitrage/api/controllers/v1/topology.py

@@ -48,6 +48,10 @@ class TopologyController(rest.RestController):
         self.client = oslo_messaging.RPCClient(transport, target)
         self.ctxt = {}
 
+    @pecan.expose('json')
+    def index(self, depth=None, graph_type='graph', query=None, root=None):
+        return self.post(depth, graph_type, query, root)
+
     @pecan.expose('json')
     def post(self, depth, graph_type, query, root):
         enforce("get topology", pecan.request.headers,