Munin contributed plugins

#!/usr/bin/env python3

"""

=head1 NAME

mongo_lag - MongoDB Replication Lag

Connects to a single mongo instance and retrieve replication lag for all connected members.

=head1 APPLICABLE SYSTEMS

MongoDB 3.X and 4.X with pymongo installed.

=head1 CONFIGURATION

Default for host is 127.0.0.1 and port 27017 and will work without being defined:

    [mongo_lag]

    env.host 127.0.0.1

    env.port 27017

    env.username user

    env.password P@55w0rd

=head1 AUTHOR

Stefan Andersen <stefan@stefanandersen.dk>

Updated by Alban Espie-Guillon <alban.espie@alterway.fr>

=head1 LICENSE

The Beer Ware License (Revision 42)

<alban.espie@alterway.fr> wrote this file. As long

as you retain this notice you can do whatever you want

with this stuff. If we meet some day, and you think

this stuff is worth it, you can buy me a beer in return.

SPDX-License-Identifier: Beerware

=cut

"""

import os

import sys

import pymongo

def _get_members():

    host = os.environ.get('host', '127.0.0.1')

    port = os.environ.get('port', 27017)

    username = os.environ.get('username', '')

    password = os.environ.get('password', '')

    conn = pymongo.MongoClient(host, int(port))

    if username:

        connAuth = conn['admin']

        connAuth.authenticate(username, password)

    repl_status = conn.admin.command("replSetGetStatus")

    members = {}

    for member in repl_status['members']:

        if member['stateStr'] != 'ARBITER' :

            name = member['name'].split('.')[0]

            members[name] = {'state': member['state'], 'optimeDate': member['optimeDate']}

    return members

def run():

    members = _get_members();

    for member in members:

        if members[member]['state'] == 1:

            primary_optime = members[member]['optimeDate']

    for member in members:

        lag = (primary_optime - members[member]['optimeDate']).seconds

        print("{0}.value {1}".format(member, lag))

def config():

    print("""graph_title MongoDB replication lag

graph_args --base 1000

graph_vlabel Replication lag (seconds)

graph_category db

""")

    for member in _get_members():

        print("{0}.label {0}".format(member))

if __name__ == "__main__":

    if len(sys.argv) > 1 and sys.argv[1] == "config":

        config()

    else:

        run()