70 lines
2.0 KiB
Python
70 lines
2.0 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 config as cfg
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from mistral import exceptions as exc
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_PYV8 = importutils.try_import('PyV8')
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_V8EVAL = importutils.try_import('v8eval')
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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 PyV8Evaluator(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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class V8EvalEvaluator(JSEvaluator):
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@classmethod
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def evaluate(cls, script, context):
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if not _V8EVAL:
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raise exc.MistralException(
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"v8eval module is not available. Please install v8eval."
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)
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v8 = _V8EVAL.V8()
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return v8.eval(('$ = %s; %s' % (json.dumps(context), script)).encode(
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encoding='UTF-8'))
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EVALUATOR = (V8EvalEvaluator if cfg.CONF.js_implementation == 'v8eval'
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else PyV8Evaluator)
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def evaluate(script, context):
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return EVALUATOR.evaluate(script, context)
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