airflow example_xcomargs 源码
airflow example_xcomargs 代码
文件路径：/airflow/example_dags/example_xcomargs.py
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# 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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"""Example DAG demonstrating the usage of the XComArgs."""
from __future__ import annotations
import logging
import pendulum
from airflow import DAG
from airflow.decorators import task
from airflow.operators.bash import BashOperator
log = logging.getLogger(__name__)
@task
def generate_value():
"""Empty function"""
return "Bring me a shrubbery!"
@task
def print_value(value, ts=None):
"""Empty function"""
log.info("The knights of Ni say: %s (at %s)", value, ts)
with DAG(
dag_id='example_xcom_args',
start_date=pendulum.datetime(2021, 1, 1, tz="UTC"),
catchup=False,
schedule=None,
tags=['example'],
) as dag:
print_value(generate_value())
with DAG(
"example_xcom_args_with_operators",
start_date=pendulum.datetime(2021, 1, 1, tz="UTC"),
catchup=False,
schedule=None,
tags=['example'],
) as dag2:
bash_op1 = BashOperator(task_id="c", bash_command="echo c")
bash_op2 = BashOperator(task_id="d", bash_command="echo c")
xcom_args_a = print_value("first!")
xcom_args_b = print_value("second!")
bash_op1 >> xcom_args_a >> xcom_args_b >> bash_op2
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