Logstash script

logstash

#! /bin/sh
### BEGIN INIT INFO
# Provides:          logstash
### END INIT INFO

# Author: your name here <change email>
#

# Do NOT "set -e"

# PATH should only include /usr/* if it runs after the mountnfs.sh script
PATH=/sbin:/usr/sbin:/bin:/usr/bin
DESC="The logstash service"
NAME=logstash
SERVICE_USER="logstash"
DAEMON="java -cp /opt/logstash/logstash-dist logstash.runner agent -f /etc/logstash.conf"
DAEMON_ARGS=
PIDFILE=/var/run/$NAME.pid
SCRIPTNAME=/etc/init.d/$NAME

# Read configuration variable file if it is present
[ -r /etc/default/$NAME ] && . /etc/default/$NAME

# Load the VERBOSE setting and other rcS variables
. /lib/init/vars.sh

# Define LSB log_* functions.
# Depend on lsb-base (>= 3.2-14) to ensure that this file is present
# and status_of_proc is working.
. /lib/lsb/init-functions
# Init
VERBOSE=1

as_user() {
  # Don't ask for password if we are logged in as reco
  if [ "$(whoami)" != "reco" ];then
      su - $SERVICE_USER -s /bin/bash -c "$1"
  else
      $1
  fi
}


start_in_screen()
{
    DAEMON_NAME=$1
    DAEMON_EXEC="$2"
    if as_user "screen -ls" | grep "\.$DAEMON_NAME" > /dev/null;then
        echo $DAEMON_NAME is already running 
        return 1
    else
        echo Starting $DAEMON_NAME in screen
        # Note the -- after the -s parameter. Some daemon execs contain parameters
        as_user "screen -d -m -S $DAEMON_NAME -s -- $DAEMON_EXEC"
    fi
}

do_to_screen()
{
    DAEMON_NAME=$1
    if ! as_user "screen -ls" | grep "\.$DAEMON_NAME" > /dev/null;then
        echo $DAEMON_NAME wasn\'t started
        return 1
    fi
    DAEMON_NAME=$1
    WHAT=$2
    if [ -z VERBOSE ];then
        echo Typing $WHAT to $DAEMON_NAME
    fi
    as_user "screen -p 0 -S $DAEMON_NAME -X stuff \"$WHAT
\""
}

stop_in_screen()
{
    DAEMON_NAME=$1
    do_to_screen $DAEMON_NAME ""
}




#
# Function that starts the daemon/service
#
do_start()
{
    start_in_screen $NAME "$DAEMON"
    [ "$?" = 1 ] && return 1
    
}

#
# Function that stops the daemon/service
#
do_stop()
{
    stop_in_screen $NAME
}

status_of_proc(){
    DAEMON_NAME=$2
    DAEMON_EXEC=$1
    if as_user 'screen -ls' | grep "\.$DAEMON_NAME" > /dev/null;then
        return 0
    else
        return 1
    fi
}


case "$1" in
  start)
	[ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$NAME"
	do_start
	case "$?" in
		0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
		2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
	esac
	;;
  stop)
	[ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$NAME"
	do_stop
	case "$?" in
		0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
		2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
	esac
	;;
  status)
       status_of_proc "$DAEMON" "$NAME" && exit 0 || exit $?
       ;;
  #reload|force-reload)
	#
	# If do_reload() is not implemented then leave this commented out
	# and leave 'force-reload' as an alias for 'restart'.
	#
	#log_daemon_msg "Reloading $DESC" "$NAME"
	#do_reload
	#log_end_msg $?
	#;;
  restart|force-reload)
	#
	# If the "reload" option is implemented then remove the
	# 'force-reload' alias
	#
	log_daemon_msg "Restarting $DESC" "$NAME"
	do_stop
    sleep 1
	case "$?" in
	  0|1)
		do_start
		case "$?" in
			0) log_end_msg 0 ;;
			1) log_end_msg 1 ;; # Old process is still running
			*) log_end_msg 1 ;; # Failed to start
		esac
		;;
	  *)
	  	# Failed to stop
		log_end_msg 1
		;;
	esac
	;;
  *)
	#echo "Usage: $SCRIPTNAME {start|stop|restart|reload|force-reload}" >&2
	echo "Usage: $SCRIPTNAME {start|stop|status|restart|force-reload}" >&2
	exit 3
	;;
esac

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