airflow scheduler_health 源码
airflow scheduler_health 代码
文件路径：/airflow/utils/scheduler_health.py
# 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 __future__ import annotations
from http.server import BaseHTTPRequestHandler, HTTPServer
from airflow.configuration import conf
from airflow.jobs.scheduler_job import SchedulerJob
from airflow.utils.net import get_hostname
from airflow.utils.session import create_session
class HealthServer(BaseHTTPRequestHandler):
"""Small webserver to serve scheduler health check"""
def do_GET(self):
if self.path == '/health':
try:
with create_session() as session:
scheduler_job = (
session.query(SchedulerJob)
.filter_by(hostname=get_hostname())
.order_by(SchedulerJob.latest_heartbeat.desc())
.limit(1)
.first()
)
if scheduler_job and scheduler_job.is_alive():
self.send_response(200)
self.end_headers()
else:
self.send_error(503)
except Exception:
self.send_error(503)
else:
self.send_error(404)
def serve_health_check():
health_check_port = conf.getint('scheduler', 'SCHEDULER_HEALTH_CHECK_SERVER_PORT')
httpd = HTTPServer(("0.0.0.0", health_check_port), HealthServer)
httpd.serve_forever()
if __name__ == "__main__":
serve_health_check()
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