airflow example_dag_decorator 源码
airflow example_dag_decorator 代码
文件路径：/airflow/example_dags/example_dag_decorator.py
#
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# to you under the Apache License, Version 2.0 (the
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#
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from __future__ import annotations
from typing import Any
import httpx
import pendulum
from airflow.decorators import dag, task
from airflow.models.baseoperator import BaseOperator
from airflow.operators.email import EmailOperator
from airflow.utils.context import Context
class GetRequestOperator(BaseOperator):
"""Custom operator to send GET request to provided url"""
def __init__(self, *, url: str, **kwargs):
super().__init__(**kwargs)
self.url = url
def execute(self, context: Context):
return httpx.get(self.url).json()
# [START dag_decorator_usage]
@dag(
schedule=None,
start_date=pendulum.datetime(2021, 1, 1, tz="UTC"),
catchup=False,
tags=['example'],
)
def example_dag_decorator(email: str = 'example@example.com'):
"""
DAG to send server IP to email.
:param email: Email to send IP to. Defaults to example@example.com.
"""
get_ip = GetRequestOperator(task_id='get_ip', url="http://httpbin.org/get")
@task(multiple_outputs=True)
def prepare_email(raw_json: dict[str, Any]) -> dict[str, str]:
external_ip = raw_json['origin']
return {
'subject': f'Server connected from {external_ip}',
'body': f'Seems like today your server executing Airflow is connected from IP {external_ip}<br>',
}
email_info = prepare_email(get_ip.output)
EmailOperator(
task_id='send_email', to=email, subject=email_info['subject'], html_content=email_info['body']
)
example_dag = example_dag_decorator()
# [END dag_decorator_usage]
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