airflow example_skip_dag 源码
airflow example_skip_dag 代码
文件路径：/airflow/example_dags/example_skip_dag.py
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"""Example DAG demonstrating the EmptyOperator and a custom EmptySkipOperator which skips by default."""
from __future__ import annotations
import pendulum
from airflow import DAG
from airflow.exceptions import AirflowSkipException
from airflow.operators.empty import EmptyOperator
from airflow.utils.context import Context
from airflow.utils.trigger_rule import TriggerRule
# Create some placeholder operators
class EmptySkipOperator(EmptyOperator):
"""Empty operator which always skips the task."""
ui_color = '#e8b7e4'
def execute(self, context: Context):
raise AirflowSkipException
def create_test_pipeline(suffix, trigger_rule):
"""
Instantiate a number of operators for the given DAG.
:param str suffix: Suffix to append to the operator task_ids
:param str trigger_rule: TriggerRule for the join task
:param DAG dag_: The DAG to run the operators on
"""
skip_operator = EmptySkipOperator(task_id=f'skip_operator_{suffix}')
always_true = EmptyOperator(task_id=f'always_true_{suffix}')
join = EmptyOperator(task_id=trigger_rule, trigger_rule=trigger_rule)
final = EmptyOperator(task_id=f'final_{suffix}')
skip_operator >> join
always_true >> join
join >> final
with DAG(
dag_id='example_skip_dag',
start_date=pendulum.datetime(2021, 1, 1, tz="UTC"),
catchup=False,
tags=['example'],
) as dag:
create_test_pipeline('1', TriggerRule.ALL_SUCCESS)
create_test_pipeline('2', TriggerRule.ONE_SUCCESS)
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