NodeJS Supervisor Start/Stop Script

nodesupervisor

#!/bin/sh
#---------------------------------
# nodesupervisor Start/Stop  Script
#---------------------------------

#---------------------------------
# chkconfig: 2345 99 99
# description: NodeJS Supervisor
# --------------------------------

RUNAS='nodejs'
SCRIPT=${0##*/}
SU=/sbin/runuser
WHOAMI=$(/usr/bin/whoami)
SYSCONFIG=/etc/sysconfig/nodesupervisor
SUPERVISOR=/usr/local/bin/supervisor
NPM=/usr/local/bin/npm
NODEJS=/usr/local/bin/node
ACTION=${1}
LOGDIR=/var/log/nodejs
TEE=/usr/bin/tee
KILLALL=/usr/bin/killall
REV=/usr/bin/rev
CUT=/usr/bin/cut
# export NODE_PATH=/usr/local/node/node-v0.10.17/lib/node_modules

# If this script is run as part of a runlevel change or as the root user,
# invoke it again as the proper user then exit.
if [[ ${SCRIPT} =~ ^[SK][0-9][0-9] ]]; then
	[[ ${SCRIPT} =~ ^S[0-9][0-9] ]] && ACTION=start
	[[ ${SCRIPT} =~ ^K[0-9][0-9] ]] && ACTION=stop
	$(readlink -f ${0}) ${ACTION}
	exit $?
elif [[ ${WHOAMI} == 'root' ]]; then
	continue  
#	${SU} - ${RUNAS} -c "${0} $@"
#	exit $?
elif [[ ${WHOAMI} != 'nodejs' ]]; then
	echo "This app intends to be run as the nodejs user or as root (where it automatically switches to run as nodejs)"
	exit 1
fi



# --------------------------------


function start () {

# Read The sysconfig file for node apps to start and start them

	while read line; do

		APPLICATION=${line}
		LOGFILE=$(awk -F/ '{ print $(NF-2)"-"$NF}' <<< "${APPLICATION}").log
# Dirty hack that does the same as removing $NF with awk but keeps my field separators in place
		WORKINGDIR=$(${REV} <<< "${APPLICATION}" | ${CUT} -d/ -f2- | ${REV})
		APPLOG=${LOGDIR}/${LOGFILE}
		if [ -e ${APPLICATION} ]; then
			cd ${WORKINGDIR}
			${NPM} install -d >> ${APPLOG} 2>&1
			### FIXME: Only do SU - RUNAS if not nodejs
			${SU} - ${RUNAS} -c "${SUPERVISOR} -w ${WORKINGDIR} ${APPLICATION} 2>&1 | ${TEE} -a ${APPLOG} > /dev/null" & 
		else
			echo Error: ${APPLICATION} does not exist.
		fi

	done < ${SYSCONFIG}
	
}

function stop () {

# I know a bad hack but it works

	${KILLALL} ${NODEJS}

}

function restart () {

	stop
	start

}

function usage () {

	echo "Usage: $0 (start|stop|restart)"	

}


case ${ACTION} in

	start )
		start ;;
	stop )
		stop ;;
	restart )
		restart ;;
	* )
		usage ;;
esac