ciscolive/automation/services/cpnr_metrics.py

#!/usr/bin/env python3
#
# Copyright (c) 2017-2020  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
from gevent.pywsgi import WSGIServer
from subprocess import run
import shlex
import re
from cleu.config import Config as C


CACHE_FILE = "/home/jclarke/cpnr_metrics.dat"
PORT = 8085

app = Flask("CPNR Stats Fetcher")

COMMANDS = {"df -h /": {"pattern": r"(\d+)%", "metrics": ["diskUtilization"]}}


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

    output = ""
    for server in C.CPNR_SERVERS:
        for command in list(COMMANDS.keys()):
            res = run(shlex.split("ssh -2 root@{} {}".format(server, command)), capture_output=True)
            if res.returncode != 0:
                print(
                    "ERROR: Failed to execute {} on {}: out='{}', err='{}'".format(
                        command, server, res.stdout.decode("utf-8").strip(), res.stderr.decode("utf-8").strip()
                    )
                )
                continue

            m = re.search(COMMANDS[command]["pattern"], res.stdout.decode("utf-8").strip())

            if m:
                i = 1
                for metric in COMMANDS[command]["metrics"]:
                    output += '{}{{server="{}"}} {}\n'.format(metric, server, m.group(i))

    return Response(output, 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()