362c2295e8
Allows to use Jinja instead of or along with YAQL for expression evaluation. * Improved error reporting on API endpoints. Previously, Mistral API tend to mute important logs related to errors during YAML parsing or expression evaluation. The messages were shown in the http response, but would not appear in logs. * Renamed yaql_utils to evaluation_utils and added few more tests to ensure evaluation functions can be safely reused between Jinja and YAQL evaluators. * Updated action_v2 example to reflect similarities between YAQL and Jinja syntax. Change-Id: Ie3cf8b4a6c068948d6dc051b12a02474689cf8a8 Implements: blueprint mistral-jinga-templates
56 lines
1.7 KiB
Python
56 lines
1.7 KiB
Python
# Copyright 2013 - Mirantis, Inc.
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# Copyright 2015 - StackStorm, 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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class Evaluator(object):
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"""Expression evaluator interface.
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Having this interface gives the flexibility to change the actual expression
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language used in Mistral DSL for conditions, output calculation etc.
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"""
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@classmethod
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@abc.abstractmethod
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def validate(cls, expression):
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"""Parse and validates the expression.
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:param expression: Expression string
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:return: True if expression is valid
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"""
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pass
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@classmethod
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@abc.abstractmethod
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def evaluate(cls, expression, context):
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"""Evaluates the expression against the given data context.
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:param expression: Expression string
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:param context: Data context
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:return: Expression result
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"""
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pass
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@classmethod
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@abc.abstractmethod
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def is_expression(cls, expression):
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"""Check expression string and decide whether it is expression or not.
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:param expression: Expression string
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:return: True if string is expression
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"""
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pass
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