#!/bin/bash
#
#
#	LXD Registration Service OCF Resource Agent
#	It records (in the CIB) various attributes of a node
#
# Copyright (c) 2017 Mathieu Grzybek
#                    All Rights Reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of version 2 of the GNU General Public License as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it would be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
# Further, this software is distributed without any warranty that it is
# free of the rightful claim of any third person regarding infringement
# or the like.  Any license provided herein, whether implied or
# otherwise, applies only to this software file.  Patent licenses, if
# any, provided herein do not apply to combinations of this program with
# other software, or any other product whatsoever.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write the Free Software Foundation,
# Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
#
#######################################################################
# Initialization:

: ${OCF_FUNCTIONS_DIR=${OCF_ROOT}/lib/heartbeat}
. ${OCF_FUNCTIONS_DIR}/ocf-shellfuncs

#######################################################################

meta_data() {
	cat <<END
<?xml version="1.0"?>
<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
<resource-agent name="LXDInfo">
<version>1.0</version>

<longdesc lang="en">
This is a LXD Registration Service Resource Agent.
It records (in the CIB) attributes about the number of running LXD containers
running on the node.
Sample output:
   lxd_containers:   5
</longdesc>
<shortdesc lang="en">Records various node attributes in the CIB</shortdesc>

<parameters>
<parameter name="pidfile" unique="0">
<longdesc lang="en">PID file</longdesc>
<shortdesc lang="en">PID file</shortdesc>
<content type="string" default="$OCF_RESKEY_pidfile" />
</parameter>
<parameter name="delay" unique="0">
<longdesc lang="en">Interval to allow values to stabilize</longdesc>
<shortdesc lang="en">Dampening Delay</shortdesc>
<content type="string" default="0s" />
</parameter>
</parameters>

<actions>
<action name="start"   timeout="20s" />
<action name="stop"    timeout="20s" />
<action name="monitor" timeout="20s" interval="60s"/>
<action name="meta-data"  timeout="5" />
<action name="validate-all"  timeout="20s" />
</actions>
</resource-agent>
END
}

#######################################################################

LXDInfoStats() {
	value=$(lxc list|grep -ci RUNNING)
	echo -e "lxd_containers:\t$value"
	${HA_SBIN_DIR}/attrd_updater ${OCF_RESKEY_delay} -S status -n lxd_containers -v $value
}

LXDInfo_usage() {
	cat <<END
usage: $0 {start|stop|monitor|validate-all|meta-data}

Expects to have a fully populated OCF RA-compliant environment set.
END
}

LXDInfo_start() {
	echo $OCF_RESKEY_clone > $OCF_RESKEY_pidfile
	LXDInfoStats
	exit $OCF_SUCCESS
}

LXDInfo_stop() {
	rm -f $OCF_RESKEY_pidfile
	${HA_SBIN_DIR}/attrd_updater ${OCF_RESKEY_delay} -D -S state -n lxd_containers
	exit $OCF_SUCCESS
}

LXDInfo_monitor() {
	if [ -f "$OCF_RESKEY_pidfile" ] ; then
		LXDInfoStats
		exit $OCF_RUNNING
	fi
	exit $OCF_NOT_RUNNING
}

LXDInfo_validate() {
	return $OCF_SUCCESS
}

if [ $# -ne 1 ]; then
    LXDInfo_usage
    exit $OCF_ERR_ARGS
fi

: ${OCF_RESKEY_pidfile:="$HA_RSCTMP/LXDInfo-${OCF_RESOURCE_INSTANCE}"}
: ${OCF_RESKEY_clone:="0"}
if [ x != x${OCF_RESKEY_delay} ]; then
	OCF_RESKEY_delay="-d ${OCF_RESKEY_delay}"
fi

case $__OCF_ACTION in
meta-data)	meta_data
		exit $OCF_SUCCESS
		;;
start)		LXDInfo_start
		;;
stop)		LXDInfo_stop
		;;
monitor)	LXDInfo_monitor
		;;
validate-all)	LXDInfo_validate
		;;
usage|help)	LXDInfo_usage
		exit $OCF_SUCCESS
		;;
*)		LXDInfo_usage
		exit $OCF_ERR_UNIMPLEMENTED
		;;
esac

exit $?
