Ensure symphony is locking room mapper in get_room_name

Signed-off-by: Tim Paine <timothy.paine@cubistsystematic.com>

csp/adapters/symphony.py

@@ -192,13 +192,14 @@ def get_room_id(self, room_name):
  return room_id
 
  def get_room_name(self, room_id):
- if room_id in self._id_to_name:
- return self._id_to_name[room_id]
- else:
- room_name = _get_room_name(room_id, self._room_info_url, self._header)
- self._name_to_id[room_name] = room_id
- self._id_to_name[room_id] = room_name
- return room_name
+ with self._lock:
+ if room_id in self._id_to_name:
+ return self._id_to_name[room_id]
+ else:
+ room_name = _get_room_name(room_id, self._room_info_url, self._header)
+ self._name_to_id[room_name] = room_id
+ self._id_to_name[room_id] = room_name
+ return room_name
 
  def set_im_id(self, user, id):
  with self._lock: