gunicorn

#!/bin/sh

### BEGIN INIT INFO
# Provides:	  gunicorn
# Required-Start:    $local_fs $remote_fs $network $syslog $named
# Required-Stop:     $local_fs $remote_fs $network $syslog $named
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: starts the gunicorn web server
# Description:       starts gunicorn using start-stop-daemon
### END INIT INFO

DAEMON=/usr/local/bin/gunicorn
IS_ENGINE=/usr/local/insightsquared/is_engine
RUN_DOT_PY=$IS_ENGINE/bbase/bin/run.py
NAME=python
DISPLAY_NAME=gunicorn
DESC=gunicorn

# Include gunicorn defaults if available
if [ -r /etc/default/gunicorn ]; then
	. /etc/default/gunicorn
fi

STOP_SCHEDULE="${STOP_SCHEDULE:-QUIT/5/TERM/5/KILL/5}"

test -x $DAEMON || exit 0

. /lib/init/vars.sh
. /lib/lsb/init-functions

PID=/run/gunicorn.pid

# Check if the ULIMIT is set in /etc/default/gunicorn
if [ -n "$ULIMIT" ]; then
	# Set the ulimits
	ulimit $ULIMIT
fi

CMD="$DAEMON bbase.wsgi_handler:application --daemon --pid $PID -c $IS_ENGINE/bbase/gunicorn_conf.py"

#
# Function that starts the daemon/service
#
do_start()
{
	# Return
	#   0 if daemon has been started
	#   1 if daemon was already running
	#   2 if daemon could not be started
	start-stop-daemon --start --quiet --chdir $IS_ENGINE --pidfile $PID --exec $RUN_DOT_PY --test > /dev/null \
		|| return 1
	start-stop-daemon --start --quiet --chdir $IS_ENGINE --pidfile $PID --exec $RUN_DOT_PY -- \
		$CMD 2>/dev/null \
		|| return 2
}

#
# Function that stops the daemon/service
#
do_stop()
{
	# Return
	#   0 if daemon has been stopped
	#   1 if daemon was already stopped
	#   2 if daemon could not be stopped
	#   other if a failure occurred
	start-stop-daemon --stop --quiet --retry=$STOP_SCHEDULE --pidfile $PID --name $NAME
	RETVAL="$?"

	sleep 1
	return "$RETVAL"
}

#
# Function that sends a SIGHUP to the daemon/service
#
do_reload() {
	start-stop-daemon --stop --signal HUP --quiet --pidfile $PID --name $NAME
	return 0
}

#
# Rotate log files
#
do_rotate() {
	start-stop-daemon --stop --signal USR1 --quiet --pidfile $PID --name $NAME
	return 0
}

#
# Online upgrade gunicorn executable
#
# "Upgrading to a new binary on the fly"
# http://docs.gunicorn.org/en/stable/signals.html#upgrading-to-a-new-binary-on-the-fly
#
do_upgrade() {
	# Return
	#   0 if gunicorn has been successfully upgraded
	#   1 if gunicorn is not running
	#   2 if the pid files were not created on time
	#   3 if the old master could not be killed
	if start-stop-daemon --stop --signal USR2 --quiet --pidfile $PID --name $NAME; then
		# Wait for both old and new master to write their pid file
		while [ ! -s "${PID}.oldbin" ] || [ ! -s "${PID}" ]; do
			cnt=`expr $cnt + 1`
			if [ $cnt -gt 10 ]; then
				return 2
			fi
			sleep 1
		done
		# Everything is ready, gracefully stop the old master
		if start-stop-daemon --stop --signal QUIT --quiet --pidfile "${PID}.oldbin" --name $NAME; then
			return 0
		else
			return 3
		fi
	else
		return 1
	fi
}

case "$1" in
	start)
		[ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$DISPLAY_NAME"
		do_start
		case "$?" in
			0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
			2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
		esac
		;;
	stop)
		[ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$DISPLAY_NAME"
		do_stop
		case "$?" in
			0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
			2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
		esac
		;;
	restart)
		log_daemon_msg "Restarting $DESC" "$DISPLAY_NAME"
		do_stop
		case "$?" in
			0|1)
				do_start
				case "$?" in
					0) log_end_msg 0 ;;
					1) log_end_msg 1 ;; # Old process is still running
					*) log_end_msg 1 ;; # Failed to start
				esac
				;;
			*)
				# Failed to stop
				log_end_msg 1
				;;
		esac
		;;
	reload|force-reload)
		log_daemon_msg "Reloading $DESC configuration" "$DISPLAY_NAME"
		do_reload
		log_end_msg $?
		;;
	status)
		status_of_proc -p $PID "$DAEMON" "$DISPLAY_NAME" && exit 0 || exit $?
		;;
	upgrade)
		log_daemon_msg "Upgrading binary" "$DISPLAY_NAME"
		do_upgrade
		log_end_msg 0
		;;
	rotate)
		log_daemon_msg "Re-opening $DESC log files" "$DISPLAY_NAME"
		do_rotate
		log_end_msg $?
		;;
	*)
		echo "Usage: $DISPLAY_NAME {start|stop|restart|reload|force-reload|status|rotate|upgrade}" >&2
		exit 3
		;;
esac

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