Add script to check onionperf instances status

#!/usr/bin/python3

# The following scripts needs the following packages installed:

# python3-prometheus-client python3-psutil python3-nmap

# Might also have to install nmap package

import nmap

import os

import psuitl

from prometheus_client import CollectorRegistry, Enum, write_to_textfile

registry = CollectorRegistry()

op = Enum('onionperf_state', 'Onionperf service current state',

        states=['starting', 'running', 'stopped', 'error'], registry=registry)

tor = Enum('tor_state', 'Tor process current state',

        states=['starting', 'running', 'stopped', 'error'], registry=registry)

tgen = Enum('tgen_state', 'Tgen process current state',

        states=['starting', 'running', 'stopped', 'error'], registry=registry)

port_status = Enum('port_status', 'Check that port 8080 can be reached',

        states=['open', 'close', 'error', 'error'], registry=registry)

try:

    op_stat = os.system('systemctl status onionperf --no-pager')

    if op_stat == 0:

        op.state('running')

    else:

        op.state('stopped')

except Exception as e:

    op.state('error')

try:

    if "tor" in (p.name() for p in psutil.process_iter()):

        tor.state('running')

    else:

        tor.state('stopped')

except Exception as e:

    tor.state('error')

try:

    if "tgen" in (p.name() for p in psutil.process_iter()):

        tgen.state('running')

    else:

        tgen.state('stopped')

except Exception as e:

    tgen.state('error')

try:

    nm = nmap.PortScanner()

    nm.scan('127.0.0.1', '8080')

    port_proxy = nm['127.0.0.1']['tcp'][8080]

    if port_proxy['state'] == 'open':

        port_status.state('open')

    else:

        port_status.state('closed')

except Exception as e:

    port_status.state('error')

write_to_textfile("./metrics", registry=registry)