Munin plugin to monitor the number of Unicorn connections on a socket

unicorn_connections

#!/bin/bash
# -*- sh -*-
# vim: ft=sh

: << =cut

=head1 NAME

unicorn_connections - Plugin to monitor the number of Unicorn connections

=head1 CONFIGURATION

 [unicorn*]
    env.socket /var/lib/unicorn.sock

=head1 AUTHOR

Cedric Felizard

=head1 LICENSE

AGPLv3+

=head1 MAGIC MARKERS

 #%# family=auto
 #%# capabilities=autoconf

=cut

SOCKET=$socket
CONNECTION_TYPES="listening active queued"

function connection_count
{
    local type;

    case "$1" in
    listening) type=01;;
    queued) type=02;;
    active) type=03;;
    esac

    [ -z $type ] && return;

    cat /proc/net/unix | grep -c -E ": [0-9]{8} 0{8} [0-9]{8} [0-9]{4} ${type} [0-9 ]+ ${SOCKET}$"
}

if [ "$1" = "autoconf" ]; then
    autoconf="yes"
    [ -S $SOCKET ] || autoconf="no"

    echo $autoconf
    exit 0
fi

if [ "$1" = "config" ]; then
    echo 'graph_title Unicorn connections'
    echo 'graph_vlabel number of connections'
    echo 'graph_category unicorn'
    echo 'graph_info This graph shows the number of Unicorn connections.'
    for type in $CONNECTION_TYPES; do
        echo "_${type}.label ${type}"
    done
    exit 0
fi

for type in $CONNECTION_TYPES; do
    echo "_${type}.value $(connection_count ${type})"
done