Source code for airflow.example_dags.subdags.subdag

#
# 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.

"""Helper function to generate a DAG and operators given some arguments."""

# [START subdag]
import pendulum

from airflow import DAG
from airflow.operators.empty import EmptyOperator


[docs]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_interval="@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]