getting-started-python/6-pubsub/monitor.py at regions · pythonthings/getting-started-python

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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.

# [START monitor]
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)
# [END monitor]

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