Munin contributed plugins

#!/usr/bin/env python

"""

=head1 NAME

etherscan_balance_ - Munin plugin to monitor your ethereum (ETH) balance

=head1 APPLICABLE SYSTEMS

All systems with "python" and "munin"

=head1 CONFIGURATION

etherscan_balance_<YOUR_PUBLIC_ETHEREUM_ADDRESS>

=head1 SYNOPSIS

  ln -s /usr/share/munin/plugins/etherscan_balance_ \

  /etc/munin/plugins/etherscan_balance_0x3257bde8cf067ae6f1ddc0e4b140fe02e3c5e44f

=head1 INTERPRETATION

This plugin shows the balance (ETH) of a given ethereum address.

Account balance is queried via etherscan.io API L<https://etherscan.io/apis>.

=head1 VERSION

0.0.1

=head1 AUTHOR

L<Nils Knieling|https://github.com/Cyclenerd>

=head1 LICENSE

GPLv2

=head1 MAGIC MARKERS

 #%# family=manual

=cut

"""

from __future__ import print_function

import sys

import json

import codecs

try:

    # python3

    from urllib.request import urlopen

    from urllib.request import Request

except ImportError:

    # python2

    from urllib2 import urlopen

    from urllib2 import Request

command = ''

if len(sys.argv) > 1:

    command = sys.argv[1]

api_action, eth_address = sys.argv[0].split("_")[1:]

if not eth_address:

    print("The filename of this plugin (or its symlink) should follow this pattern: "

          "'etherscan_balance_<YOUR_PUBLIC_ETHEREUM_ADDRESS>'", file=sys.stderr)

    sys.exit(9)

if command == 'config':

    print("graph_title ETH {}".format(eth_address))

    print("graph_info Ethereum Account Balance for Address {}".format(eth_address))

    print("graph_vlabel Ethereum Balance")

    print("graph_category htc")

    print("{}.label ETH".format(eth_address))

    sys.exit(0)

ethercan_balance_api_url = 'https://api.etherscan.io/api?module=account&action=balance&tag=latest&address=' + eth_address

etherscan_req = Request(ethercan_balance_api_url)

# User-Agent to bypass Cloudflare

etherscan_req.add_header('User-Agent', 'Etherscan Munin Plugin/1.0')

try:

    etherscan_balance_raw = urlopen(etherscan_req, timeout=15)

except IOError as exc:

    print("Failed to request etherscan.io API: {}".format(exc), file=sys.stderr)

reader = codecs.getreader("utf-8")

try:

    etherscan_balance = json.load(reader(etherscan_balance_raw))

except ValueError:

    print("Failed to parse JSON response.", file=sys.stderr)

    sys.exit(9)

try:

    float(etherscan_balance['result'])

except:

    print("JSON result error!", file=sys.stderr)

    sys.exit(9)

eth = float(etherscan_balance['result']) / 1000000000000000000

print("{}.value {:.2f}".format(eth_address, eth));