#!/bin/sh
#
# Copyright (c) 2018 Wind River Systems, Inc.
#
# The right to copy, distribute, modify, or otherwise make use
# of this software may be licensed only pursuant to the terms
# of an applicable Wind River license agreement.
#

### BEGIN INIT INFO
# Provides:          Gnocchi API
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Gnocchi REST API daemon
### END INIT INFO

RETVAL=0
DESC="gnocchi-api"
PIDFILE="/var/run/$DESC.pid"
PYTHON=`which python`
EXEC="/usr/bin/gunicorn"

CONFIGFILE="/usr/share/gnocchi/gnocchi-api.conf"
LOGFILE="/var/log/gnocchi/api.log"

start()
{
    if [ -e $PIDFILE ]; then
        PIDDIR=/proc/$(cat $PIDFILE)
        if [ -d ${PIDDIR} ]; then
            echo "$DESC already running."
            return
        else
            echo "Removing stale PID file $PIDFILE"
            rm -f $PIDFILE
        fi
    fi

    echo -n "Starting $DESC..."
    
    start-stop-daemon --start --quiet --background --pidfile ${PIDFILE} \
        --make-pidfile --exec ${PYTHON} -- ${EXEC} --config ${CONFIGFILE} \
        --pythonpath '/usr/share/gnocchi' gnocchi-api --log-file ${LOGFILE}

    RETVAL=$?
    if [ $RETVAL -eq 0 ]; then
        echo "Gnocchi API started."
    else
        echo "Gnocchi API start failed."
    fi
}

stop()
{
    if [ ! -e $PIDFILE ]; then
        echo "Gnocchi API already stopped."
        return
    fi

    echo -n "Stopping $DESC..."

    start-stop-daemon --stop --quiet --pidfile $PIDFILE
    RETVAL=$?
    if [ $RETVAL -eq 0 ]; then
        echo "Gnocchi API stopped."
    else
        echo "Gnocchi API stop failed."
    fi
    rm -f $PIDFILE
}

status()
{
    pid=`cat $PIDFILE 2>/dev/null`
    if [ -n "$pid" ]; then
        if ps -p $pid &> /dev/null ; then
            echo "$DESC is running"
            RETVAL=0
            return
        else
            echo "$DESC is not running but has pid file"
            RETVAL=1
        fi
    fi
    echo "$DESC is not running"
    RETVAL=3
}

case "$1" in
    start)
        start
        ;;
    stop)
        stop
        ;;
    restart|force-reload|reload)
        stop
        start
        ;;
    status)
	    status
        ;;
    *)
        echo "Usage: $0 {start|stop|force-reload|restart|reload|status}"
        RETVAL=1
        ;;
esac

exit $RETVAL