airflow subdag 源码
airflow subdag 代码
文件路径：/airflow/example_dags/subdags/subdag.py
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# to you under the Apache License, Version 2.0 (the
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"""Helper function to generate a DAG and operators given some arguments."""
from __future__ import annotations
# [START subdag]
import pendulum
from airflow import DAG
from airflow.operators.empty import EmptyOperator
def subdag(parent_dag_name, child_dag_name, args):
"""
Generate a DAG to be used as a subdag.
:param str parent_dag_name: Id of the parent DAG
:param str child_dag_name: Id of the child DAG
:param dict args: Default arguments to provide to the subdag
:return: DAG to use as a subdag
:rtype: airflow.models.DAG
"""
dag_subdag = DAG(
dag_id=f'{parent_dag_name}.{child_dag_name}',
default_args=args,
start_date=pendulum.datetime(2021, 1, 1, tz="UTC"),
catchup=False,
schedule="@daily",
)
for i in range(5):
EmptyOperator(
task_id=f'{child_dag_name}-task-{i + 1}',
default_args=args,
dag=dag_subdag,
)
return dag_subdag
# [END subdag]
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