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