warden_server.py

    def init_obj(sect_name):
        config = conf.get(sect_name, {})
        sect_name = sect_name.lower()
        sect_def = section_def[sect_name]

        try:    # Object type defined?
            objtype = config["type"]
            del config["type"]
        except KeyError:    # No, fetch default object type for this section
            objtype = sect_def[0]
        else:
            if not objtype in sect_def:
                raise KeyError("Unknown type %s in section %s" % (objtype, sect_name))

        params = param_def[objtype]

        # No surplus parameters? Disallow also 'obj' attributes, these are only
        # to provide default referenced section
        for name in config:
            if name not in params or (name in params and params[name]["type"] is objdef):
                raise KeyError("Unknown key %s in section %s" % (name, sect_name))

        # Process parameters
        kwargs = {}
        for name, definition in params.iteritems():
            raw_val = config.get(name, definition["default"])
            try:
                val = definition["type"](raw_val)
            except Exception:
                raise KeyError("Bad value \"%s\" for %s in section %s" % (raw_val, name, sect_name))
            kwargs[name] = val

        cls = globals()[objtype]   # get class/function type
        try:
            obj = cls(**kwargs)         # run it
        except Exception as e:
            raise KeyError("Cannot initialize %s from section %s: %s" % (
                objtype, sect_name, str(e)))

        if isinstance(obj, Object):
            # Log only objects here, functions must take care of themselves
            logging.info("Initialized %s" % str(obj))

        objects[sect_name] = obj
        return obj

    # Init logging with at least simple stderr StreamLogger
    # Dunno if it's ok within wsgi, but we have no other choice, let's
    # hope it at least ends up in webserver error log
    StreamLogger()

    # Shared container for common data of ongoing WSGI request
    objects["req"] = Request()

    try:
        # Now try to init required objects
        for o in ("log", "db", "auth", "validator", "handler", "server"):
            init_obj(o)
    except Exception as e:
        logging.critical(str(e))
        logging.debug("", exc_info=sys.exc_info())
        return fallback_wsgi

    logging.info("Ready to serve")

    return objects["server"]


if __name__=="__main__":
    # FIXME: just development stuff
    srv = build_server(read_ini("warden3.cfg.wheezy-warden3"))