#!/bin/bash
#
# rc.ip2cn-server -- 2008-08-11, last edit 2009-12-23
#
# ip2cn-server daemon start/stop/restart/reload script
#
# Copyright (C) 2008,2009 Grant Coady <grant@bugs.id.au> GPLv2
#
# Info and latest version see: http://bugs.id.au/ip2cn/
#

progname="ip2cn-server"
codepath=$(gawk '/^codepath/ {print $2; exit}' /etc/ip2cn-server.conf)
inetport=$(gawk '/^inetport/ {print $2; exit}' /etc/ip2cn-server.conf)
server="$codepath/$progname"
pidfile="/var/run/ip2cn-server.pid"
verbose=
[ "$2" == "-v" ] && verbose=1

ip2cn_stop()
{
	if [ -r $pidfile ]
	then
		[ $verbose ] && echo "signal graceful shutdown"
		local count=5
		kill -SIGINT $(cat $pidfile) 2>/dev/null
		while [ $count -gt 0 ]
		do
			[ $verbose ] && echo "wait for shutdown, $count"
			sleep 1
			[ -r $pidfile ] || break
			count=$(( count - 1 ))
		done
		[ -r $pidfile ] || return

		[ $verbose ] && echo "ungraceful shutdown"
		kill -SIGTERM $(cat $pidfile) 2>/dev/null
		sleep 1
		[ -r $pidfile ] || return
	fi
	[ $verbose ] && echo "$pidfile stale or missing"

	listen=$(netstat -l |grep $inetport |grep -c LISTEN)
	[ $listen -eq 0 ] && rm -f $pidfile && echo "server not running" && return

	[ $verbose ] && echo "server running, get pid"
	pid=$(ps -C $server -o pid=)

	[ -z "$pid" ] && [ $verbose ] && echo "odd, no pid!"
	[ -z "$pid" ] && return

	[ $verbose ] && echo "repair $pidfile, retry"
	echo $pid > $pidfile && ip2cn_stop		# recursion!
}

ip2cn_start()
{
	if [ -r $pidfile ]
	then
		pid=$(cat $pidfile)
		run=$(ps -p $pid -o comm=)
		if [ -z "$run" ]
		then
			[ $verbose ] && echo "removing stale $pidfile"
			rm $pidfile
		else
			[ $verbose ] && echo "server is running, use: $0 restart"
			exit 1
		fi
	fi
	[ $verbose ] && echo "starting $server"
	$server -j -d && return

	pid=$(ps -C $server -o pid=)
	[ -z "$pid" ] && [ $verbose ] && echo "problem starting server" && return

	[ $verbose ] && echo "server is running, repair $pidfile"
	echo $pid > $pidfile
}

case $1 in
	start)		ip2cn_start
	;;
	stop)		ip2cn_stop
	;;
	restart)	ip2cn_stop; ip2cn_start
	;;
	reload)		[ -r $pidfile ] && kill -SIGUSR1 $(cat $pidfile) 2>/dev/null
	;;
	*)		echo >&2 "

  usage: rc.ip2cn-server start|stop|restart|reload [-v]

	start	  start ip2cn-server if not running
	stop	  stop ip2cn-server if running
	restart	  stop then start ip2c-server
	reload	  signal ip2cn-server to reload database files

	-v        be verbose, for debug

"
			exit 1
	;;
esac
#end