Node JS App server Init.d script

app.sh

#!/bin/sh

#
# chkconfig: 35 99 99
# description: Node.js app server script
#

. /etc/rc.d/init.d/functions

USER="root"

DAEMON="/usr/bin/node"
ROOT_DIR="/var/www/html/honorbound/latest"

SCRIPT="$(basename $0)"
PIDFILE="/var/run/$SCRIPT.pid"


SERVER="$ROOT_DIR/main.js"
LOG_FILE="/var/log/node/node.log"
SHUTDOWN_WAIT=20

app_pid()
{
	echo `ps -aefw | grep "$DAEMON $SERVER" | grep -v " grep " | awk '{print $2}'`
}

do_start()
{
                echo -n $"Starting $SERVER: "
		pid=$(app_pid)
		if [ -n "$pid" ]
		then
			echo "App server is already running (pid: $pid)"
		else
			echo "App server is not running - starting it up!"
	                runuser -l "$USER" -c "$DAEMON $SERVER >> $LOG_FILE 2>&1 &" && echo_success || echo_failure
			pid=$(app_pid)
			echo "App server started, runing at $pid"
			echo $pid > ${PIDFILE}
	                RETVAL=$?
                echo
                [ $RETVAL -eq 0 ]
		fi
		return 0
}

do_wait()
{
	echo "Waiting for process to exit";
	pid=$(app_pid)
	if [ -n "$pid" ]
        then
		let kwait=$SHUTDOWN_WAIT
		count=0;
		until [ `ps -p $pid | grep -c $pid` = '0' ] || [ $count -gt $kwait ]
		do
			echo -n -e "\nwaiting for processes to exit";
			sleep 1
			let count=$count+1;
		done
	fi
	return 0
}

do_stop()
{
        echo -n $"Stopping $SERVER: "
        pid=`ps -aefw | grep "$DAEMON $SERVER" | grep -v " grep " | awk '{print $2}'`
        kill -9 $pid > /dev/null 2>&1 && echo_success || echo_failure
	if [ -f ${PIDFILE} ]; then
		rm ${PIDFILE}
	fi
        RETVAL=$?
        echo
        [ $RETVAL -eq 0 ]
}

case "$1" in
        start)
                do_start
                ;;
        stop)
                do_stop
                ;;
        restart)
                do_stop
		do_wait
                do_start
                ;;
        *)
                echo "Usage: $0 {start|stop|restart}"
                RETVAL=1
esac

exit $RETVAL