#!/bin/sh
#
# Copyright (c) 2016 Babak Farrokhi.  All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
#
# 12-Aug-2015 @farrokhi
# This script extracts IRQ interrupt rate for network interfaces from "vmstat -i" 
# on FreeBSD and feeds to munin
#
# XXX: This script relies on lang/gawk (we use extended regexp in awk).
#
# Magic markers:
#%# family=auto
#%# capabilities=autoconf suggest


SCRIPT_NAME=$(basename $0)
STAT_TYPE=`echo $SCRIPT_NAME | sed -n s/netirq_//p`
VMSTAT="/usr/bin/vmstat"
AWK=`which gawk` || ( echo "gawk not found"; exit 1 )


STATFILE=`mktemp -t netirq`
${VMSTAT} -i | sort -V > ${STATFILE} 2>/dev/null

if [ $# -lt 1 ]; then

	if [ -z ${STAT_TYPE} ]; then
		echo "Should run from symlink"
		exit 1
	fi

elif [ "$1" == "suggest" ]; then   
  for iface in `ifconfig -lu ether`; do
   echo ${iface}
  done

elif [ "$1" == "autoconf" ]; then
   ${VMSTAT} -i  >/dev/null 2>&1  && echo yes || echo no
   exit 0

elif [ "$1" == "config" ]; then

	if [ -z ${STAT_TYPE} ]; then
		echo "Should run from symlink";
		exit 1
	fi

	echo "graph_title IRQ Statistics for ${STAT_TYPE}"
	echo "graph_args --lower-limit 0 --base 1000"
	echo "graph_vlabel interrupts / second"
	echo "graph_category system"

	cat ${STATFILE} | ${AWK} '
BEGIN { 
	FS = "[ ]{2,}" 
}  

/'${STAT_TYPE}'/ {
	split($1,name,":"); 
        gsub(/ /,"", $1);
	print name[1]".label " $1;
	print name[1]".type DERIVE";
	print name[1]".min 0";
	print name[1]".draw LINE2";
}
'
else

        ${AWK} '
{ FS = "[ ]{2,}" }
/'${STAT_TYPE}'/ {
        split($1,name,":");
        print name[1]".value "$2
}' ${STATFILE}

fi

rm ${STATFILE}