config-perf: Fix filter handling in bulk list api handler

Pick key/val list from 'filters' key in POST body when bulk list
API is used (POST instead of GET when query-params too large).

Change-Id: Ibb462f78a85cd2ae8ac788d7ef74da2793d007d7
Partial-Bug: #1462156

src/config/api-server/tests/test_crud_basic.py

@@ -1007,6 +1007,12 @@ def test_list_bulk_collection(self):
                      for ret in ret_list['virtual-machine-interfaces']]
         self.assertThat(set(vmi_uuids), Equals(set(ret_uuids)))
 
+        logger.info("Querying RIs by parent_id and filter.")
+        flexmock(self._api_server).should_call('_list_collection').once()
+        ret_list = self._vnc_lib.resource_list('routing-instance',
+            parent_id=vn_uuids,
+            filters={'display_name':'%s-ri-5' %(self.id())})
+        self.assertThat(len(ret_list['routing-instances']), Equals(1))
     # end test_list_bulk_collection
 
     def test_list_lib_api(self):

src/config/api-server/vnc_cfg_api_server.py

@@ -846,16 +846,17 @@ def list_bulk_collection_http_post(self):
         is_count = bottle.request.json.get('count', False)
         is_detail = bottle.request.json.get('detail', False)
 
-        filters = {}
-        filter_fnames = bottle.request.json.get(
-            'filter_field_names', '').split(',')
-        filter_fvalues = bottle.request.json.get(
-            'filter_field_values', '').split(',')
-        if len(filter_fnames) or len(filter_fvalues):
-            if len(filter_fnames) != len(filter_fvalues):
-                bottle.abort(400, "Bad Request, filter parameters unequal")
-            filters['field_names'] = filter_fnames
-            filters['field_values'] = filter_fvalues
+        filter_params = bottle.request.json.get('filters', {})
+        if filter_params:
+            try:
+               ff_key_vals = filter_params.split(',')
+               ff_names = [ff.split('==')[0] for ff in ff_key_vals]
+               ff_values = [ff.split('==')[1] for ff in ff_key_vals]
+               filters = {'field_names': ff_names, 'field_values': ff_values}
+            except Exception as e:
+               bottle.abort(400, 'Invalid filter ' + filter_params)
+        else:
+            filters = None
 
         return self._list_collection(obj_type, parent_uuids, back_ref_uuids,
                                      obj_uuids, is_count, is_detail, filters)

src/config/api-server/vnc_cfg_ifmap.py

@@ -1463,6 +1463,9 @@ def dbe_count_children(self, obj_type, obj_id, child_type):
     # end dbe_read
 
     def dbe_read_multi(self, obj_type, obj_ids_list, obj_fields=None):
+        if not obj_ids_list:
+            return (True, [])
+
         method_name = obj_type.replace('-', '_')
         try:
             (ok, cassandra_result) = self._cassandra_db.read(