#!/bin/bash
set -Cuo pipefail
PATH=/bin:/usr/bin:/usr/local/bin:/sbin:/usr/sbin

cd /var/www/html/rrd

function pingrrd() {
  target=$1
  var=ping$(echo $target | sed 's/\..*//')
  rrd="${var}.rrd"
  if ! test -f "$rrd"
  then
    rrdtool create "$rrd" --step 300 \
      DS:${var}:GAUGE:600:U:U \
      RRA:AVERAGE:0.5:1:576 \
      RRA:AVERAGE:0.5:6:672 \
      RRA:MAX:0.5:6:672 \
      RRA:AVERAGE:0.5:288:797
  fi
  val=$(ping6 -w4 -n -c3 "$target" | \
	  ruby -ne 'puts $1 if /mdev = ([0-9.]*)\//' || echo 'U')
  if [ "$val" = "" ]; then
    val="U"
  fi
  logger -p news.info -t pingrrd target=$target val=$val
  rrdupdate $rrd N:${val}
  rrdtool graph -o ${var}.png -t "$var" \
    DEF:pt=${rrd}:${var}:AVERAGE CDEF:fail=pt,UN,500,* \
    LINE1:pt#0088FF LINE2:fail#FF8800 > /dev/null
  rrdtool graph -o ${var}d10.png -t "$var" \
    -e now -s end-864000s \
    DEF:pt=${rrd}:${var}:AVERAGE CDEF:fail=pt,UN,500,* \
    LINE1:pt#0088FF LINE2:fail#FF8800 > /dev/null
}

trap 'logger -p news.info -t pingrrd abend' EXIT
pingrrd rv440n1.toyoda-eizi.net
pingrrd cherrypie.toyoda-eizi.net
trap ':' EXIT