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example_dag_decorator.py
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example_dag_decorator.py
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#
# 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.
from typing import Any, Dict
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_interval=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']
)
dag = example_dag_decorator()
# [END dag_decorator_usage]