#!/bin/sh
#
# nginx	Nginx Web Server (@type@ version)
#
# chkconfig:	345 85 15
# description:  Nginx is an HTTP(S) server, HTTP(S) reverse \
#               proxy and IMAP/POP3 proxy server
# processname:	nginx
# pidfile:	/var/run/nginx.pid
# config:	/etc/nginx/nginx.conf

# Source function library
. /etc/rc.d/init.d/functions

# Source networking configuration.
. /etc/sysconfig/network

nginx="/usr/sbin/nginx"
svname="nginx"
prog=${nginx##*/}

sysconfig="/etc/sysconfig/$prog"
lockfile="/var/lock/subsys/$prog"
pidfile="/var/run/$prog.pid"

NGINX_CONF_FILE="/etc/nginx/$prog.conf"

# Get service config
[ -f $sysconfig ] && . $sysconfig

# Check that networking is up.
if is_yes "${NETWORKING}"; then
	if [ ! -f /var/lock/subsys/network -a "$1" != stop -a "$1" != status ]; then
		msg_network_down "$svname"
		exit 1
	fi
else
	exit 0
fi

# configtest itself
# must return non-zero if check failed
# output is discarded if checkconfig is ran without details
configtest() {
	$nginx -t -c $NGINX_CONF_FILE
}

# wrapper for configtest
checkconfig() {
	local details=${1:-0}

	if [ $details = 1 ]; then
		# run config test and display report (status action)
		show "Checking %s configuration" "$svname"; busy
		local out
		out=$(configtest 2>&1)
		RETVAL=$?
		if [ $RETVAL = 0 ]; then
			ok
		else
			fail
		fi
		[ "$out" ] && echo >&2 "$out"
	else
		# run config test and abort with nice message if failed
		# (for actions checking status before action).
		configtest >/dev/null 2>&1
		RETVAL=$?
		if [ $RETVAL != 0 ]; then
			show "Checking %s configuration" "$svname"; fail
			nls 'Configuration test failed. See details with %s "checkconfig"' $0
			exit $RETVAL
		fi
	fi
}

start() {
	# Check if the service is already running?
	if [ ! -f $lockfile ]; then
		checkconfig
		msg_starting "$svname"
		daemon $nginx -c $NGINX_CONF_FILE
		RETVAL=$?
		[ $RETVAL -eq 0 ] && touch $lockfile
	else
		msg_already_running "$svname"
	fi
}

stop() {
	local oldbin_pidfile="${pidfile}.oldbin"

	# Stop daemons.
	if [ -f $lockfile ]; then
		if [ -f $oldbin_pidfile ] && [ -f $pidfile ]; then
			msg_stopping "$svname (old process)"
			killproc -p $oldbin_pidfile $prog -TERM
		fi
		msg_stopping "$svname"
		killproc -p $pidfile $prog
		RETVAL=$?
		rm -f $lockfile $pidfile >/dev/null 2>&1
	else
		msg_not_running "$svname"
	fi
}

reload() {
	if [ -f $lockfile ]; then
		checkconfig
		msg_reloading "$svname"
		killproc -p $pidfile $prog -HUP
		RETVAL=$?
	else
		msg_not_running "$svname"
		RETVAL=7
	fi
}

condrestart() {
	if [ ! -f $lockfile ]; then
		msg_not_running "$svname"
		RETVAL=$1
		return
	fi

	checkconfig
	stop
	start
}

# Upgrade the binary with no downtime.
# http://nginx.org/en/docs/control.html#upgrade
# TODO: handle revert back on failed upgrade
upgrade() {
	local oldbin_pidfile="${pidfile}.oldbin" retry

	checkconfig
	show "Upgrading $svname"
	killproc -p $pidfile $prog -USR2
	RETVAL=$?

	# wait for 3m
	retry=720
	while [ $retry -gt 0 ]; do
		if [ -f $oldbin_pidfile ] && [ -f $pidfile ]; then
                        show "Upgrade: stopping old workers"
                        killproc -p $oldbin_pidfile $prog -WINCH
			show "Upgrade: stopping old master process"
			killproc -p $oldbin_pidfile $prog -QUIT
			return 0
		else
			usleep 250000
			retry=$(($retry -1))
		fi
	done

	show "Upgrade: stopping old process"; fail
	nls 'old process pid file was not found'
	return 1
}

# Tell nginx to reopen logs
# http://nginx.org/en/docs/control.html#logs
reopen_logs() {
	local oldbin_pidfile="${pidfile}.oldbin"

	if [ -f $oldbin_pidfile ]; then
		show "Reopening $svname (oldbin) logs"
		killproc -p $oldbin_pidfile $prog -USR1
	fi

	show "Reopening $svname logs"
	killproc -p $pidfile $prog -USR1
}

RETVAL=0
# See how we were called.
case "$1" in
  start)
	start
	;;
  stop)
	stop
	;;
  restart)
	checkconfig
	stop
	start
	;;
  try-restart)
	condrestart 0
	;;
  reload|graceful)
	reload
	;;
  force-reload|upgrade)
	upgrade
	;;
  reopen-logs)
	reopen_logs
	;;
  checkconfig|configtest)
	checkconfig 1
	;;
  status)
	status --pidfile $pidfile $prog
	RETVAL=$?
	;;
  *)
	msg_usage "$0 {start|stop|restart|try-restart|reload|force-reload|graceful|reopen-logs|checkconfig|status}"
	exit 3
	;;
esac

exit $RETVAL