#!/bin/sh
# Copyright 2010 Lekensteyn
# This script is public domain and comes with NO WARRANTY of any kind
#
# Events handler (handles build queue, attacks, etc)
if test `id -u` -eq 0;then
	sudo -u nobody -- "$0"
	exit
fi
running=true
trap 'running=false' 1 2 3 15
cd "$(dirname "$0")/.."
BASEDIR="`pwd`"
PIDFILE="$BASEDIR/tmp/event.pid"
killed=
# worlds, folder names inside htdocs, e.g. htdocs/welt1/daemons
worlds='welt1 welt2'
# if a pidfile still exist (unclean shutdown), kill that pid and wait
# 2 seconds for it to catch our signal
test -f "$PIDFILE" && kill -15 "`cat "$PIDFILE"`" >/dev/null && killed=1
printf $$ > "$PIDFILE"
test -n "$killed" && sleep 2
cd htdocs/daemons
runWorld() {
	local world="$1"
	# example dir: /opt/twlan/htdocs/welt1/daemons
	cd "$BASEDIR/htdocs/$world/daemons"
	env -i LD_LIBRARY_PATH="$BASEDIR/lib" "$BASEDIR/php/php" event.php &
	pid=$!
	# check if we still should run (if we have not been killed)
	while $running;do
		# is PHP not running anymore? Restart it
		if ! kill -0 $pid 2>/dev/null >/dev/null;then
			runWorld "$world"
			return
		fi
		# and wait a second as we do not have to check realtime
		sleep 1
	done
	# kill PHP instance
	kill -15 $pid 2>/dev/null >/dev/null
}
run(){
	test -f "$PIDFILE" || exit 2
	sleep 1
	if test ! -S "$BASEDIR/tmp/mysql.sock";then
		echo 'MySQL is not running.'
		return
	fi
	# list of pids to kill later
	pids=
	# start PHP, run build queues, attacks, etc for each world
	for world in $worlds; do
		runWorld "$world" &
	done
	# keep this process in foreground while running
	while $running; do
		sleep 1
	done
}
run
detect_pid=`cat "$PIDFILE"`
test "$detect_pid" = $$ && rm -f "$PIDFILE"