#!/bin/sh
#
# Copyright (C) 2009 - 2012 Andreas Thienemann <andreas@bawue.net>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Library General Public License as published by
# the Free Software Foundation; version 2 only
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Library General Public License for more details.
#
# You should have received a copy of the GNU Library General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#

: <<=cut

=head1 NAME

cyrus-imapd - Munin plugin to monitor the load on a cyrus imapd server

=head1 CONFIGURATION

The user running this plugin needs read and write access to the
cyrus-imapd proc directory.  You will need to add the following to the
munin-node/plugin configuration:

  [cyrus-imapd]
  user root

=head1 INTERPRETATION

This plugin should be pretty self explanatory.

It displays the following three datapoints:

    - Total number of open connections (both in authenticated and
      non-authenticated state)
    - Number of authenticated sessions
    - Number of unique users

=head1 MAGIC MARKERS

  #%# family=contrib
  #%# capabilities=autoconf

=head1 VERSION

  0.0.20120307

=head1 BUGS

None known. If you find any, please put in a ticket at <https://trac.bawue.org/munin/newticket>.

=head1 AUTHOR

Andreas Thienemann <andreas@bawue.net>

=head1 LICENSE

GPLv2

=cut

# IMAP Configuration Directory
PROCDIR=$(awk -F : '/^proc_path:/ { gsub(/ /, "", $2); print $2 }' /etc/imapd.conf 2> /dev/null)
if [ "x${PROCDIR}x" = "xx" ]; then
	CONFIGDIR=$(awk -F : '/^configdirectory:/ { gsub(/ /, "", $2); print $2 }' /etc/imapd.conf 2> /dev/null)
	PROCDIR="${CONFIGDIR}/proc"
fi

if [ "$1" = "autoconf" ]; then
	if [ "x${PROCDIR}x" != "xx" ] && [ -d ${PROCDIR} ]; then
		echo yes
	else
		echo "no (no cyrus-imapd procdir found)"
	fi
	exit 0
fi

# Check if we actually got some sensible data
if [ "x${PROCDIR}x" = "xx" ]; then
	exit 1
fi

# If run with the "config"-parameter, give out information on how the
# graphs should look.

if [ "$1" = "config" ]; then
	echo 'graph_title Cyrus IMAPd Load'
	echo 'graph_args --base 1000 -l 0'
	echo 'graph_vlabel connections'
	echo 'graph_scale no'
	echo 'graph_category mail'
	echo 'graph_info Current connections to the imap server. <a href="http://trac.bawue.org/">bawue.net e.V. Trac repository</a>.'
	echo 'graph_order connections authenticated_users unique_users'
	echo 'connections.label Connections'
	echo 'connections.info Number of connections to the imap server.'
	echo 'authenticated_users.label Authenticated Users'
	echo 'authenticated_users.info Number of authenticated users logged into the imap server.'
	echo 'unique_users.label Unique Users'
	echo 'unique_users.info Number of unique users on the imap server.'

	# Last, if run with the "config"-parameter, quit here (don't
	# display any data)
	exit 0
fi

cons=$(ls ${PROCDIR} | wc -l)

if [ $cons -gt 0 ]; then
	# Print the number of connections to the imap server
	echo "connections.value $cons"

	# Read the proc files and get the logged in users
	echo -n "authenticated_users.value "
	awk '{ split(substr($0, match($0, "]")+1), a); if (a[1] != "") print a[1] }' ${PROCDIR}/* | wc -l

	# Read the proc files and get the number of unique users
	echo -n "unique_users.value "
	awk '{ split(substr($0, match($0, "]")+1), a); if (a[1] != "") print a[1] }' ${PROCDIR}/* | sort -u | wc -l
else
	echo "connections.value 0"
	echo "authenticated_users.value 0"
	echo "unique_users.value 0"
fi