Add operation parameters type check

    def _check_params(self, command, params):
        method = self._check_operation(command)
        required_params = []
        other_params = []
        for param in method['params']:
            if param['required']:
                required_params.append(param['name'])
            else:
                other_params.append(param['name'])

        for param in params.keys():
            if (not param in required_params
                and not param in other_params):
                log.trace("Unexpected param '%s' for operation '%s'", param,
                            command)
        for param in required_params:
            if not param in params:
                raise ValueError(
                    "Missing required param '%s' for operation '%s'" % (
                        param, command))

        # TODO: add typechecking