| # Licensed to the Apache Software Foundation (ASF) under one |
| # or more contributor license agreements. See the NOTICE file |
| # distributed with this work for additional information |
| # regarding copyright ownership. The ASF licenses this file |
| # to you 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. |
| from copy import deepcopy |
| from typing import Any, Dict |
| |
| from flask import Flask |
| |
| |
| class FeatureFlagManager: |
| def __init__(self) -> None: |
| super().__init__() |
| self._get_feature_flags_func = None |
| self._feature_flags: Dict[str, Any] = {} |
| |
| def init_app(self, app: Flask) -> None: |
| self._get_feature_flags_func = app.config["GET_FEATURE_FLAGS_FUNC"] |
| self._feature_flags = app.config["DEFAULT_FEATURE_FLAGS"] |
| self._feature_flags.update(app.config["FEATURE_FLAGS"]) |
| |
| def get_feature_flags(self) -> Dict[str, Any]: |
| if self._get_feature_flags_func: |
| return self._get_feature_flags_func(deepcopy(self._feature_flags)) |
| |
| return self._feature_flags |
| |
| def is_feature_enabled(self, feature: str) -> bool: |
| """Utility function for checking whether a feature is turned on""" |
| feature_flags = self.get_feature_flags() |
| |
| if feature_flags and feature in feature_flags: |
| return feature_flags[feature] |
| |
| return False |