| # 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 |
| |
| import logging |
| from http.server import BaseHTTPRequestHandler, HTTPServer |
| |
| from airflow.configuration import conf |
| from airflow.jobs.job import Job |
| from airflow.jobs.scheduler_job_runner import SchedulerJobRunner |
| from airflow.utils.net import get_hostname |
| from airflow.utils.session import create_session |
| |
| log = logging.getLogger(__name__) |
| |
| |
| 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(Job) |
| .filter_by(job_type=SchedulerJobRunner.job_type) |
| .filter_by(hostname=get_hostname()) |
| .order_by(Job.latest_heartbeat.desc()) |
| .first() |
| ) |
| if scheduler_job and scheduler_job.is_alive(): |
| self.send_response(200) |
| self.end_headers() |
| else: |
| self.send_error(503) |
| except Exception: |
| log.exception("Exception when executing Health check") |
| 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() |