airflow metastore 源码
airflow metastore 代码
文件路径：/airflow/secrets/metastore.py
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# to you under the Apache License, Version 2.0 (the
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"""Objects relating to sourcing connections from metastore database"""
from __future__ import annotations
import warnings
from typing import TYPE_CHECKING
from airflow.exceptions import RemovedInAirflow3Warning
from airflow.secrets import BaseSecretsBackend
from airflow.utils.session import provide_session
if TYPE_CHECKING:
from airflow.models.connection import Connection
class MetastoreBackend(BaseSecretsBackend):
"""Retrieves Connection object and Variable from airflow metastore database."""
@provide_session
def get_connection(self, conn_id, session=None) -> Connection | None:
from airflow.models.connection import Connection
conn = session.query(Connection).filter(Connection.conn_id == conn_id).first()
session.expunge_all()
return conn
@provide_session
def get_connections(self, conn_id, session=None) -> list[Connection]:
warnings.warn(
"This method is deprecated. Please use "
"`airflow.secrets.metastore.MetastoreBackend.get_connection`.",
RemovedInAirflow3Warning,
stacklevel=3,
)
conn = self.get_connection(conn_id=conn_id, session=session)
if conn:
return [conn]
return []
@provide_session
def get_variable(self, key: str, session=None):
"""
Get Airflow Variable from Metadata DB
:param key: Variable Key
:return: Variable Value
"""
from airflow.models.variable import Variable
var_value = session.query(Variable).filter(Variable.key == key).first()
session.expunge_all()
if var_value:
return var_value.val
return None
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