airflow environment_variables 源码
airflow environment_variables 代码
文件路径：/airflow/secrets/environment_variables.py
#
# Licensed to the Apache Software Foundation (ASF) under one
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# 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
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"""Objects relating to sourcing connections from environment variables"""
from __future__ import annotations
import os
import warnings
from airflow.exceptions import RemovedInAirflow3Warning
from airflow.secrets import BaseSecretsBackend
CONN_ENV_PREFIX = "AIRFLOW_CONN_"
VAR_ENV_PREFIX = "AIRFLOW_VAR_"
class EnvironmentVariablesBackend(BaseSecretsBackend):
"""Retrieves Connection object and Variable from environment variable."""
def get_conn_uri(self, conn_id: str) -> str | None:
"""
Return URI representation of Connection conn_id
:param conn_id: the connection id
:return: deserialized Connection
"""
warnings.warn(
"This method is deprecated. Please use "
"`airflow.secrets.environment_variables.EnvironmentVariablesBackend.get_conn_value`.",
RemovedInAirflow3Warning,
stacklevel=2,
)
return self.get_conn_value(conn_id)
def get_conn_value(self, conn_id: str) -> str | None:
return os.environ.get(CONN_ENV_PREFIX + conn_id.upper())
def get_variable(self, key: str) -> str | None:
"""
Get Airflow Variable from Environment Variable
:param key: Variable Key
:return: Variable Value
"""
return os.environ.get(VAR_ENV_PREFIX + key.upper())
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