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monitor.py
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# Copyright 2015 Google Inc.
#
# Licensed 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.
import os
import sys
from flask import Flask
# The app checks this file for the PID of the process to monitor.
PID_FILE = None
# Create app to handle health checks and monitor the queue worker. This will
# run alongside the worker, see procfile.
monitor_app = Flask(__name__)
# The health check reads the PID file created by psqworker and checks the proc
# filesystem to see if the worker is running. This same pattern can be used for
# rq and celery.
@monitor_app.route('/_ah/health')
def health():
if not os.path.exists(PID_FILE):
return 'Worker pid not found', 503
with open(PID_FILE, 'r') as pidfile:
pid = pidfile.read()
if not os.path.exists('/proc/{}'.format(pid)):
return 'Worker not running', 503
return 'healthy', 200
@monitor_app.route('/')
def index():
return health()
if __name__ == '__main__':
PID_FILE = sys.argv[1]
monitor_app.run('0.0.0.0', 8080)