#!/bin/sh
### BEGIN INIT INFO
# Provides:          matrix-synapse
# Required-Start:    $local_fs $network $remote_fs $syslog
# Required-Stop:     $local_fs $network $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: <Enter a short description of the software>
# Description:       <Enter a long description of the software>
#                    <...>
#                    <...>
### END INIT INFO

# Author: Paul "LeoNerd" Evans <paul@matrix.org>

# Do NOT "set -e"

# PATH should only include /usr/* if it runs after the mountnfs.sh script
PATH=/sbin:/usr/sbin:/bin:/usr/bin
DESC="matrix-synapse"
NAME=matrix-synapse
SCRIPTNAME=/etc/init.d/$NAME

PYTHON="/usr/bin/python"
CONFIGS="--config-path /etc/matrix-synapse/homeserver.yaml --config-path /etc/matrix-synapse/conf.d/"
USER="matrix-synapse"
SHAREDIR=/var/lib/$NAME

# Exit if the package is not installed
[ -f "/etc/matrix-synapse/homeserver.yaml" ] || exit 0

# Read configuration variable file if it is present
[ -r /etc/default/$NAME ] && . /etc/default/$NAME

# Load the VERBOSE setting and other rcS variables
. /lib/init/vars.sh

# Define LSB log_* functions.
# Depend on lsb-base (>= 3.2-14) to ensure that this file is present
# and status_of_proc is working.
. /lib/lsb/init-functions

get_config_key()
{
	python -m synapse.config read "$1" $CONFIGS || return 2
}

#
# Function that starts the daemon/service
#
do_start()
{
	# Running --generate-config to create keys if any are absent.
	# Doesn't matter if not
	$PYTHON -m "synapse.app.homeserver" $CONFIGS --generate-keys || return 2

	# Return
	#   0 if daemon has been started
	#   1 if daemon was already running
	#   2 if daemon could not be started
	PIDFILE=`get_config_key "pid_file"`
	RETVAL=$?
	if [ "$RETVAL" != 0 ]; then
		return $RETVAL
	fi
	if [ -r "$PIDFILE" ]; then
		kill -0 `cat $PIDFILE` && return 1
	fi

	export PYTHONPATH

	# Create the PID file so that synapse can write to it as nonroot
	touch $PIDFILE
	chown $USER:nogroup $PIDFILE
	chown $USER:nogroup $SHAREDIR/media/
	chown $USER:nogroup $SHAREDIR/uploads/

	start-stop-daemon --start --pidfile $PIDFILE --chuid $USER \
	  --exec $PYTHON -- -m "synapse.app.homeserver" $CONFIGS --daemonize || return 2

	return 0
}

#
# 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
	PIDFILE=`get_config_key "pid_file"`
	RETVAL=$?
	if [ "$RETVAL" != 0 ]; then
		return $RETVAL
	fi

	start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 --pidfile $PIDFILE --user $USER --exec $PYTHON
	RETVAL="$?"
	[ "$RETVAL" = 2 ] && return 2

	# Many daemons don't delete their pidfiles when they exit.
	rm -f $PIDFILE
	return "$RETVAL"
}

#
# Function that sends a SIGHUP to the daemon/service
#
do_reload() {
	#
	# If the daemon can reload its configuration without
	# restarting (for example, when it is sent a SIGHUP),
	# then implement that here.
	#
	return 1
}

case "$1" in
  start)
	[ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$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 $DESC" "$NAME"
	do_stop
	case "$?" in
		0|1) [ "$VERBOSE" != no ] && log_end_msg 0 ;;
		2) [ "$VERBOSE" != no ] && log_end_msg 1 ;;
	esac
	;;
  status)
    PIDFILE=`get_config_key "pid_file"`
    RETVAL=$?
    if [ "$RETVAL" != 0 ]; then
        return $RETVAL
    fi
	status_of_proc -p "$PIDFILE" "$PYTHON" "$NAME" && exit 0 || exit $?
	;;
  #reload|force-reload)
	#
	# If do_reload() is not implemented then leave this commented out
	# and leave 'force-reload' as an alias for 'restart'.
	#
	#log_daemon_msg "Reloading $DESC" "$NAME"
	#do_reload
	#log_end_msg $?
	#;;
  restart|force-reload)
	#
	# If the "reload" option is implemented then remove the
	# 'force-reload' alias
	#
	log_daemon_msg "Restarting $DESC" "$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
	;;
  *)
	#echo "Usage: $SCRIPTNAME {start|stop|restart|reload|force-reload}" >&2
	echo "Usage: $SCRIPTNAME {start|stop|status|restart|force-reload}" >&2
	exit 3
	;;
esac

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