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Diffstat (limited to 'yardstick/common/task_template.py')
-rwxr-xr-x | yardstick/common/task_template.py | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/yardstick/common/task_template.py b/yardstick/common/task_template.py new file mode 100755 index 000000000..2739323bd --- /dev/null +++ b/yardstick/common/task_template.py @@ -0,0 +1,53 @@ +############################################################################## +# 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 + + +class TaskTemplate(object): + @classmethod + 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) + + +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 |