#!/bin/bash
#
# Copyright 2014-2023 Security Onion Solutions, LLC
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# if this script isn't already running
if [[ ! "`pidof -x $(basename $0) -o %PPID`" ]]; then

  PREVCOUNTFILE='/tmp/helixevents.txt'
  EVENTCOUNTCURRENT="$(curl -s localhost:9600/_node/stats | jq '.pipelines.helix.events.out')"

  if [ ! -z "$EVENTCOUNTCURRENT" ]; then

    if [ -f "$PREVCOUNTFILE" ]; then
      EVENTCOUNTPREVIOUS=`cat $PREVCOUNTFILE`
    else
      echo "${EVENTCOUNTCURRENT}" > $PREVCOUNTFILE
      exit 0
    fi

    echo "${EVENTCOUNTCURRENT}" > $PREVCOUNTFILE
    EVENTS=$(((EVENTCOUNTCURRENT - EVENTCOUNTPREVIOUS)/30))
    if [ "$EVENTS" -lt 0 ]; then
      EVENTS=0
    fi

    echo "helixeps eps=${EVENTS%%.*}"
  fi

fi

exit 0