airflow __init__ 源码
airflow init 代码
文件路径：/airflow/api/common/experimental/init.py
#
# 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
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# Unless required by applicable law or agreed to in writing,
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"""Experimental APIs."""
from __future__ import annotations
from datetime import datetime
from airflow.exceptions import DagNotFound, DagRunNotFound, TaskNotFound
from airflow.models import DagBag, DagModel, DagRun
def check_and_get_dag(dag_id: str, task_id: str | None = None) -> DagModel:
"""Checks that DAG exists and in case it is specified that Task exist"""
dag_model = DagModel.get_current(dag_id)
if dag_model is None:
raise DagNotFound(f"Dag id {dag_id} not found in DagModel")
dagbag = DagBag(dag_folder=dag_model.fileloc, read_dags_from_db=True)
dag = dagbag.get_dag(dag_id)
if not dag:
error_message = f"Dag id {dag_id} not found"
raise DagNotFound(error_message)
if task_id and not dag.has_task(task_id):
error_message = f'Task {task_id} not found in dag {dag_id}'
raise TaskNotFound(error_message)
return dag
def check_and_get_dagrun(dag: DagModel, execution_date: datetime) -> DagRun:
"""Get DagRun object and check that it exists"""
dagrun = dag.get_dagrun(execution_date=execution_date)
if not dagrun:
error_message = f'Dag Run for date {execution_date} not found in dag {dag.dag_id}'
raise DagRunNotFound(error_message)
return dagrun
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