Init.d script for starting multiple and concurrent Terraria Server instances

terraria-server.sh

#!/bin/bash
### BEGIN INIT INFO
# Provides:		terraria_server
# Required-Start:	$local_fs $remote_fs $network
# Required-Stop:	$local_fs $remote_fs $network
# Default-Start:	2 3 4 5
# Default-Stop:		0 1 6
# X-Interactive:	true
# Short-Description: Start/stop terraria_server
### END INIT INFO

DESC="TShock Terraria Server"
USERID=terraria
BINDIR=/home/terraria
SCREENDAEMON=$(which screen)
#MONODAEMON=$(which mono)
MONODAEMON=$(which mono-sgen) # an experimental version of mono with a more efficient memory handler: apt-get install mono-sgen
#MONODAEMON=$(which mono-boehm) # an experimental version of mono with a more efficient memory handler: apt-get install mono-sgen
WORLDS="World1"

. /etc/default/terraria-server

# All important args for TerrariaServer.exe
DAEMONARGS="-ip 0.0.0.0 -maxplayers 8"

# Command sent to server to exit, try just "exit" to save world before exit. You WILL need to increase EXIT_TIMEOUT (try 30+)
#EXIT_COMMAND="exit-nosave"
EXIT_COMMAND="exit"
# wait X seconds for terraria to exit
#EXIT_TIMEOUT=5
EXIT_TIMEOUT=30

# Exit if not lib functions
[ -r /lib/lsb/init-functions ] || exit 0
. /lib/lsb/init-functions

# Exit if screen cant be found
[ -x "${SCREENDAEMON}" ] || exit 0
# Exit if mono cant be found
[ -x "${MONODAEMON}" ] || exit 0
# Exit if base directory for instances cant be found
[ -d "${BINDIR}" ] || exit 0
# Exit if no Worlds specified
[ -n "${WORLDS}" ] || exit 0

checkScreen() {
	#INST_NAME=${NAME}
	if [ -e /var/run/screen/S-${USERID}/*.${INST_NAME} ]; then return 0; fi
	return 1
}

checkPID() {
	#INST_PATH=${BINDIR}
	PIDFILE=${INST_PATH}/tshock/tshock.pid

	if [ -e ${PIDFILE} ] && kill -0 $(cat ${PIDFILE} 2>/dev/null) > /dev/null 2>&1; then return 0; fi
	return 1
}

cd ${BINDIR}
case "$1" in
  start)
	OIFS=$IFS
	IFS=","
	for WLD in $WORLDS; do
		INST_PATH=$BINDIR/$WLD
		INST_NAME="Terraria_Inst_${WLD}"

		rm -f $INST_PATH/ServerLog.txt
                find $INST_PATH/tshock/ -maxdepth 1 -iname "*.log" -exec mv {} $INST_PATH/tshock/oldlogs/ \;

		log_daemon_msg "Starting TShock instance ${WLD} ... "
		EC=1

		if [ ! -d "${INST_PATH}" ]; then
			log_progress_msg "ERR: Instance folder not found.";
		elif [ ! -r "${INST_PATH}/TerrariaServer.exe" ]; then
			log_progress_msg "ERR: Instance Daemon not found.";
		elif checkScreen || checkPID; then
		        log_progress_msg "(already running)";
	        else
	                su ${USERID} -c "cd ${INST_PATH}; ${SCREENDAEMON} -dmS ${INST_NAME} ${MONODAEMON} ${INST_PATH}/TerrariaServer.exe ${DAEMONARGS} -world ${INST_PATH}/Terraria/Worlds/${WLD}.wld";
        	        # Wait up to 5 seconds for it to start
	                for i in {0..5}; do
	                        if checkPID; then EC=0; break; fi # found running PID
	                        sleep 1
	                done
	        fi

		log_end_msg $EC
	done

	IFS=$OIFS
    ;;
  debug)
	OIFS=$IFS
	IFS=","
	if [ -n "$2" ]; then
		WLD=$2
		INST_PATH=$BINDIR/$WLD

		rm -f $INST_PATH/ServerLog.txt
                find $INST_PATH/tshock/ -maxdepth 1 -iname "*.log" -exec mv {} $INST_PATH/tshock/oldlogs/ \;

		if [ ! -d "${INST_PATH}" ]; then
			echo "ERR: Instance folder not found.";
		elif [ ! -r "${INST_PATH}/TerrariaServer.exe" ]; then
			echo "ERR: Instance Daemon not found.";
		elif checkPID; then
		        echo "Server instance for this world already running on background!";
	        else
	                su ${USERID} -c "cd ${INST_PATH}; ${INST_NAME} ${MONODAEMON} ${INST_PATH}/TerrariaServer.exe ${DAEMONARGS} -world ${INST_PATH}/Terraria/Worlds/${WLD}.wld";
	        fi
	else
		echo "You should provide an instance name (according to the WORLDS config variable)"
	fi

	IFS=$OIFS
    ;;
  stop)
	OIFS=$IFS
 	IFS=","
 	for WLD in $WORLDS; do
                INST_PATH=$BINDIR/$WLD
                INST_NAME="Terraria_Inst_${WLD}"

                log_daemon_msg "Stopping TShock instance ${WLD} ... "
                EC=1

                if [ ! -d "${INST_PATH}" ]; then
                        log_progress_msg "ERR: Instance folder not found.";
                elif [ ! -r "${INST_PATH}/TerrariaServer.exe" ]; then
                        log_progress_msg "ERR: Instance Daemon not found.";
                elif ! checkScreen || ! checkPID; then
                        log_progress_msg "(not running, or stale pidfile)";
                else
			# Use screen to stuff text to console
	                su "${USERID}" -c 'screen -dr '${INST_NAME}' -X stuff "'${EXIT_COMMAND}'$(printf \\r)"'
	                # Wait for the process to end
	                n=${EXIT_TIMEOUT}
	                for (( i=0; i<n; i++ )); do
	                        if ! checkScreen; then EC=0; break; fi;
	                        sleep 1;
	                done
                fi

                log_end_msg $EC
        done

        IFS=$OIFS
    ;;
  restart)
	$0 stop
	$0 start
    ;;
  connect)
	if [ -n "$2" ]; then
		INST_NAME="Terraria_Inst_$2"
		if checkScreen; then
			# Use script to bypass TTY issues
			su "${USERID}" -c "script -qc \"screen -dr ${INST_NAME}\" /dev/null"
		else
			echo "${INST_NAME}: Connect failed. (screen not running or no instance with that name found)"
		fi
	else
		echo "You should provide an instance name (according to the WORLDS config variable)"
	fi
    ;;
  *)
	echo "Usage: $0 {start|stop|restart|connect <inst>}" 2>&1
    ;;
esac