#!/bin/sh
# rc.etherpad-lite 
# Initscript that manages an instance of etherpad-Lite running on Slackware Linux. 
#
# Author: Luke Williams ( xocel@iquidus.org )
# License: WTFPL <http://sam.zoy.org/wtfpl/COPYING>

USER="etherpad"
HOMEDIR="/var/etherpad-lite"
LOGDIR="/var/log/etherpad-lite"
PIDFILE="/var/run/etherpad-lite.pid"

etherpad_start() {
  echo "Starting Etherpad lite..."
  # Launch etherpads run.sh script
  /bin/su -l -c "$HOMEDIR/bin/run.sh -s /etc/etherpad-lite/settings.json >> $LOGDIR/etherpad.log 2>> $LOGDIR/error.log &" $USER 
  # Determine and store PID. In order for this to work sucessfully
  # the node.js server needs to have finished launching, normally 
  # waiting 5 seconds is enough but in some situations (first launch
  # after install for example) it can take a while longer. 
  PID='' # Process ID
  COUNT=0 # Count attempts at determining the Process ID
  TIMEOUT=9 # Number of failed attempts before exiting, default:9 (9x5=45seconds)
  while [ -z "$PID" ]; do
  	# We don't want anyones boot process hanging here if this 
  	# script is started on boot and etherpad is unable to lanuch.
  	# So exit out if etherpad appears to be failing to start. 
  	if [ $COUNT -eq $TIMEOUT ]; then
  		echo "Unable to start Etherpad lite.."
  		cat $LOGDIR/etherpad.log | tail -n 5
  		rm -f "$PIDFILE"
  		exit 1
  	fi
  	# Wait for node.js server to start up
  	sleep 5
  	# Store the PID
  	ps ax | grep [s]erver.js | awk '{print $1}' > "$PIDFILE"
  	# Check PID was written
  	PID=`cat $PIDFILE 2>/dev/null`
  	COUNT=$(($COUNT+1))
  done
  echo "Running."
}

etherpad_stop() {
	echo "Stopping Etherpad lite..."
	PID=`cat $PIDFILE 2>/dev/null`
	if [ -z "$PID" ]; then
	    echo " not running."
	elif kill -15 $PID; then
	    echo " stopped."
	    rm -f "$PIDFILE"
	else
	    sleep 1
	    if kill -9 $PID; then
	      	echo " killed."
	      	rm -f "$PIDFILE"
	    else
	      	echo " error!"
	    	exit 1
	    fi
	fi
}

etherpad_status() {
	PID=`cat $PIDFILE 2>/dev/null`
  	if [ -z "$PID" ]; then
    	echo "Not running."
    	exit 1
  	elif kill -0 $PID; then
    	echo "Running."
    	exit 0
  	else
    	echo "PID file $PIDFILE present but PID $PID is not running."
    	exit 1
  	fi
}

case "$1" in
start)
		etherpad_start
	;;

	stop)
		etherpad_stop
	;;

	restart)
		etherpad_stop
		sleep 3
		etherpad_start
	;;

	status)
		etherpad_status
	;;

	*)
	echo "Usage  $0 (start|stop|restart|status)"
esac