Source code for yardstick.common.task_template
##############################################################################
# Copyright (c) 2015 Huawei Technologies Co.,Ltd and others.
#
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
# http://www.apache.org/licenses/LICENSE-2.0
# yardstick: this file is copied from rally and slightly modified
##############################################################################
import re
import jinja2
import jinja2.meta
[docs]class TaskTemplate(object):
@classmethod
[docs] def render(cls, task_template, **kwargs):
"""Render jinja2 task template to Yardstick input task.
:param task_template: string that contains template
:param kwargs: Dict with template arguments
:returns:rendered template str
"""
from six.moves import builtins
ast = jinja2.Environment().parse(task_template)
required_kwargs = jinja2.meta.find_undeclared_variables(ast)
missing = set(required_kwargs) - set(kwargs) - set(dir(builtins))
real_missing = [mis for mis in missing
if is_really_missing(mis, task_template)]
if real_missing:
multi_msg = ("Please specify next template task arguments:%s")
single_msg = ("Please specify template task argument:%s")
raise TypeError((len(real_missing) > 1 and multi_msg or single_msg)
% ", ".join(real_missing))
return jinja2.Template(task_template).render(**kwargs)
[docs]def is_really_missing(mis, task_template):
# Removing variables that have default values from
# missing. Construction that won't be properly
# check is {% set x = x or 1}
if re.search(mis.join(["{%\s*set\s+", "\s*=\s*", "[^\w]+"]),
task_template):
return False
# Also check for a default filter which can show up as
# a missing variable
if re.search(mis + "\s*\|\s*default\(", task_template):
return False
return True