ciscolive/automation/network/dhcp_metrics.py

#!/usr/bin/env python
#
# Copyright (c) 2017-2023  Joe Clarke <jclarke@cisco.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.

from flask import Flask
from flask import Response
import json
import CLEUCreds  # type: ignore
from gevent.pywsgi import WSGIServer
from cleu.config import Config as C  # type: ignore


CACHE_FILE = "/home/jclarke/dhcp_metrics.dat"
PORT = 8083

app = Flask("DHCP Stats Fetcher")


@app.route("/metrics")
def get_metrics():
    global CACHE_FILE

    fd = open(CACHE_FILE, "r")
    macs = json.load(fd)
    fd.close()

    return Response("\n".join(macs) + "\n", mimetype="text/plain")


if __name__ == "__main__":
    #    app.run(host='10.100.253.13', port=8081, threaded=True)
    http_server = WSGIServer((C.WSGI_SERVER, PORT), app)
    http_server.serve_forever()