deb-mistral/mistral/utils/javascript.py
Anastasia Kuznetsova dbdc29531c Fix all H405 pep8 errors
Improved code style, fixed all H405 (Multi line docstring
summary not separated with an empty line) errors.

Change-Id: I6639a2e1a9dc5d3802cb1bda05c5bf9b302bc82f
2015-11-16 18:00:18 +03:00

55 lines
1.5 KiB
Python

# Copyright 2015 - Mirantis, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import abc
import json
from oslo_utils import importutils
from mistral import exceptions as exc
_PYV8 = importutils.try_import('PyV8')
class JSEvaluator(object):
@classmethod
@abc.abstractmethod
def evaluate(cls, script, context):
"""Executes given JavaScript."""
pass
class V8Evaluator(JSEvaluator):
@classmethod
def evaluate(cls, script, context):
if not _PYV8:
raise exc.MistralException(
"PyV8 module is not available. Please install PyV8."
)
with _PYV8.JSContext() as ctx:
# Prepare data context and way for interaction with it.
ctx.eval('$ = %s' % json.dumps(context))
result = ctx.eval(script)
return _PYV8.convert(result)
# TODO(nmakhotkin) Make it configurable.
EVALUATOR = V8Evaluator
def evaluate(script, context):
return EVALUATOR.evaluate(script, context)