Munin contributed plugins

#!/usr/bin/env python3

"""=cut

=head1 NAME

  bitcoind_ - Track Bitcoin Server Variables

=head1 CONFIGURATION

You need to be able to authenticate to the bitcoind server to issue rpc's.

This plugin supports two ways to do that:

1) In /etc/munin/plugin-conf.d/bitcoin.conf place:

     [bitcoind_*]

     user your-username

     env.bitcoin_configfile /home/your-username/.bitcoin/bitcoin.conf

   Then be sure that the file referenced above (typically: $HOME/.bitcoin/bitcoin.conf)

   has the correct authentication info:

       rpcconnect, rpcport, rpcuser, rpcpassword

2) Place your bitcoind authentication directly in /etc/munin/plugin-conf.d/bitcoin.conf

     [bitcoind_*]

     env.rpcport 8332

     env.rpcconnect 127.0.0.1

     env.rpcuser your-username-here

     env.rpcpassword your-password-here

To install all available graphs:

    sudo munin-node-configure --libdir=. --suggest --shell | sudo bash

Leave out the "| bash" to get a list of commands you can select from to install

individual graphs.

=head1 MAGIC MARKERS

  #%# family=auto

  #%# capabilities=autoconf suggest

=head1 LICENSE

MIT License

=head1 AUTHOR

Copyright (C) 2012 Mike Koss

=cut"""

import base64

import json

import os

import re

import sys

import time

import urllib.error

import urllib.request

DEBUG = os.getenv('MUNIN_DEBUG') == '1'

def main():

    # getinfo variable is read from command name - probably the sym-link name.

    request_var = sys.argv[0].split('_', 1)[1] or 'balance'

    command = sys.argv[1] if len(sys.argv) > 1 else None

    request_labels = {'balance': ('Wallet Balance', 'BTC'),

                      'connections': ('Peer Connections', 'Connections'),

                      'fees': ("Tip Offered", "BTC"),

                      'transactions': ("Transactions", "Transactions",

                                       ('confirmed', 'waiting')),

                      'block_age': ("Last Block Age", "Seconds"),

                      'difficulty': ("Difficulty", ""),

                      }

    labels = request_labels[request_var]

    if len(labels) < 3:

        line_labels = [request_var]

    else:

        line_labels = labels[2]

    if command == 'suggest':

        for var_name in request_labels.keys():

            print(var_name)

        return True

    if command == 'config':

        print('graph_category htc')

        print('graph_title Bitcoin %s' % labels[0])

        print('graph_vlabel %s' % labels[1])

        for label in line_labels:

            print('%s.label %s' % (label, label))

        return True

    # Munin should send connection options via environment vars

    bitcoin_options = get_env_options('rpcconnect', 'rpcport', 'rpcuser', 'rpcpassword')

    bitcoin_options.rpcconnect = bitcoin_options.get('rpcconnect', '127.0.0.1')

    bitcoin_options.rpcport = bitcoin_options.get('rpcport', '8332')

    error = None

    if bitcoin_options.get('rpcuser') is None:

        conf_file = os.getenv("bitcoin_configfile")

        if not conf_file:

            error = "Missing environment settings: rpcuser/rcpassword or bitcoin_configfile"

        elif not os.path.exists(conf_file):

            error = "Configuration file does not exist: {}".format(conf_file)

        else:

            bitcoin_options = parse_conf(conf_file)

    if not error:

        try:

            bitcoin_options.require('rpcuser', 'rpcpassword')

        except KeyError as exc:

            error = str(exc).strip("'")

    if not error:

        bitcoin = ServiceProxy('http://%s:%s' % (bitcoin_options.rpcconnect,

                                                 bitcoin_options.rpcport),

                               username=bitcoin_options.rpcuser,

                               password=bitcoin_options.rpcpassword)

        (info, connect_error) = bitcoin.getinfo()

        error = "Could not connect to Bitcoin server: {}".format(connect_error)

    if command == 'autoconf':

        if error:

            print('no ({})'.format(error))

        else:

            print('yes')

        return True

    if error:

        print(error, file=sys.stderr)

        return False

    if request_var in ('transactions', 'block_age'):

        (info, error) = bitcoin.getblockhash(info['blocks'])

        (info, error) = bitcoin.getblock(info)

        info['block_age'] = int(time.time()) - info['time']

        info['confirmed'] = len(info['tx'])

    if request_var in ('fees', 'transactions'):

        (memory_pool, error) = bitcoin.getrawmempool()

        if memory_pool:

            info['waiting'] = len(memory_pool)

    for label in line_labels:

        print("%s.value %s" % (label, info[label]))

def parse_conf(filename):

    """ Bitcoin config file parser. """

    options = Options()

    re_line = re.compile(r'^\s*([^#]*)\s*(#.*)?$')

    re_setting = re.compile(r'^(.*)\s*=\s*(.*)$')

    try:

        with open(filename) as file:

            for line in file.readlines():

                line = re_line.match(line).group(1).strip()

                m = re_setting.match(line)

                if m is None:

                    continue

                (var, value) = (m.group(1), m.group(2).strip())

                options[var] = value

    except OSError:

        # the config file may be missing

        pass

    return options

def get_env_options(*vars):

    options = Options()

    for var in vars:

        value = os.getenv(var)

        if value is not None:

            options[var] = os.getenv(var)

    return options

class Options(dict):

    """A dict that allows for object-like property access syntax."""

    def __getattr__(self, name):

        try:

            return self[name]

        except KeyError:

            raise AttributeError(name)

    def require(self, *names):

        missing = []

        for name in names:

            if self.get(name) is None:

                missing.append(name)

        if len(missing) > 0:

            raise KeyError("Missing required setting{}: {}."

                           .format('s' if len(missing) > 1 else '', ', '.join(missing)))

class ServiceProxy:

    """

    Proxy for a JSON-RPC web service. Calls to a function attribute

    generates a JSON-RPC call to the host service. If a callback

    keyword arg is included, the call is processed as an asynchronous

    request.

    Each call returns (result, error) tuple.

    """

    def __init__(self, url, username=None, password=None):

        self.url = url

        self.id = 0

        self.username = username

        self.password = password

    def __getattr__(self, method):

        self.id += 1

        return Proxy(self, method, id=self.id)

class Proxy:

    def __init__(self, service, method, id=None):

        self.service = service

        self.method = method

        self.id = id

    def __call__(self, *args):

        if DEBUG:

            arg_strings = [json.dumps(arg) for arg in args]

            print("Calling %s(%s) @ %s" % (self.method,

                                           ', '.join(arg_strings),

                                           self.service.url))

        data = {

            'method': self.method,

            'params': args,

            'id': self.id,

        }

        request = urllib.request.Request(self.service.url, json.dumps(data).encode())

        if self.service.username:

            auth_string = '%s:%s' % (self.service.username, self.service.password)

            auth_b64 = base64.urlsafe_b64encode(auth_string.encode()).decode()

            request.add_header('Authorization', 'Basic %s' % auth_b64)

        try:

            body = urllib.request.urlopen(request).read()

        except urllib.error.URLError as e:

            return (None, e)

        if DEBUG:

            print('RPC Response (%s): %s' % (self.method, json.dumps(body, indent=4)))

        try:

            data = json.loads(body)

        except ValueError as e:

            return (None, e.message)

        # TODO: Check that id matches?

        return (data['result'], data['error'])

def get_json_url(url):

    request = urllib.request.Request(url)

    body = urllib.request.urlopen(request).read()

    data = json.loads(body)

    return data

if __name__ == "__main__":

    sys.exit(0 if main() else 1)