#!/bin/sh
#
#
# OCF resource agent to attach a cinder volume to an instance.
#
# Copyright (c) 2018 Mathieu GRZYBEK
# Based on code of Markus Guertler
# 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

# Defaults
OCF_RESKEY_openstackcli_default="/usr/bin/openstack"

: ${OCF_RESKEY_openstackcli=${OCF_RESKEY_openstackcli_default}}

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


USAGE="usage: $0 {start|stop|status|meta-data}";
###############################################################################


###############################################################################
#
# Functions
#
###############################################################################


metadata() {
cat <<END
<?xml version="1.0"?>
<!DOCTYPE resource-agent SYSTEM "ra-api-1.dtd">
<resource-agent name="openstack-cinder-volume">
<version>2.0</version>
<longdesc lang="en">
Resource Agent to attach a cinder volume to an instance.
It relies on attributes given by openstack-info resource agent (openstack_id attribute).
</longdesc>
<shortdesc lang="en">Attach a cinder volume</shortdesc>

<parameters>
<parameter name="openstackcli">
<longdesc lang="en">
Path to command line tools for openstack.
</longdesc>
<shortdesc lang="en">Path to Openstack CLI tool</shortdesc>
<content type="string" default="${OCF_RESKEY_openstackcli_default}" />
</parameter>

<parameter name="openrc" required="1">
<longdesc lang="en">
Valid Openstack credentials as openrc file from api_access/openrc.
</longdesc>
<shortdesc lang="en">openrc file</shortdesc>
<content type="string" />
</parameter>

<parameter name="volume_id" required="1">
<longdesc lang="en">
Cinder volume identifier to use to attach the bloc storage.
</longdesc>
<shortdesc lang="en">Volume ID</shortdesc>
<content type="string" />
</parameter>

</parameters>

<actions>
<action name="start" timeout="180s" />
<action name="stop" timeout="180s" />
<action name="monitor" depth="0" timeout="30s" interval="60s" />
<action name="validate-all" timeout="5s" />
<action name="meta-data" timeout="5s" />
</actions>
</resource-agent>
END
}

osvol_validate() {
	check_binary "$OCF_RESKEY_openstackcli"

	if [ -z "$OCF_RESKEY_openrc" ]; then
		ocf_exit_reason "openrc parameter not set"
		return $OCF_ERR_CONFIGURED
	fi

	if [ ! -f "$OCF_RESKEY_openrc" ] ; then
		ocf_exit_reason "openrc file not found"
		return $OCF_ERR_CONFIGURED
	fi

	. $OCF_RESKEY_openrc

	if ! $OCF_RESKEY_openstackcli volume list|grep -q $OCF_RESKEY_volume_id ; then
		ocf_exit_reason "Volume $OCF_RESKEY_volume_id not found"
		return $OCF_ERR_CONFIGURED
	fi

	return $OCF_SUCCESS
}

osvol_monitor() {
	local result
	local attached_server_id
	local node_id

	# Is the volue attached?
	result=$($OCF_RESKEY_openstackcli volume show \
		--column status \
		--column attachments \
		--format value \
		$OCF_RESKEY_volume_id)

	if [[ "$result" =~ "available" ]] ; then
		ocf_log warn "$OCF_RESKEY_volume_id is not attached to any instance"
		return $OCF_NOT_RUNNING
	else
		attached_server_id=$(echo $result|head -n1|awk -F "'" '{print $4}')
		ocf_log info "$OCF_RESKEY_volume_id is attached to instance $attached_server_id"
		node_id=$(${HA_SBIN_DIR}/attrd_updater --query -n openstack_id -N $HOSTNAME \
			| awk '{gsub("value=","") ; gsub("\"","") ; print $NF}')

		if [ "$node_id" != "$attached_server_id" ] ; then
			return $OCF_NOT_RUNNING
		fi
	fi

	return $OCF_SUCCESS
}

osvol_stop() {
	local node_id

	osvol_monitor
	if [ $? = $OCF_NOT_RUNNING ]; then
		ocf_log info "Volume $OCF_RESKEY_volume_id already available"
		return $OCF_SUCCESS
	fi

	node_id=$(${HA_SBIN_DIR}/attrd_updater --query -n openstack_id -N $HOSTNAME \
		| awk '{gsub("value=","") ; gsub("\"","") ; print $NF}')
	if ! $OCF_RESKEY_openstackcli server remove volume $node_id $OCF_RESKEY_volume_id ; then
		ocf_log error "Couldn't remove volume $OCF_RESKEY_volume_id from instance $node_id"
		return $OCF_ERR_GENERIC
	fi

	ocf_log info "Successfully removed $OCF_RESKEY_volume_id from instance $node_id"
	return $OCF_SUCCESS
}

osvol_start() {
	local node_id

	osvol_monitor
	if [ $? = $OCF_SUCCESS ]; then
		ocf_log info "$OCF_RESKEY_volume_id already attached"
		return $OCF_SUCCESS
	fi

	node_id=$(${HA_SBIN_DIR}/attrd_updater --query -n openstack_id -N $HOSTNAME \
		| awk '{gsub("value=","") ; gsub("\"","") ; print $NF}')
	$OCF_RESKEY_openstackcli server add volume $node_id $OCF_RESKEY_volume_id
	if [ $? != $OCF_SUCCESS ]; then
		ocf_log error "Couldn't add volume $OCF_RESKEY_volume_id to instance $node_id"
		return $OCF_ERR_GENERIC
	fi

	return $OCF_SUCCESS
}

###############################################################################
#
# MAIN
#
###############################################################################

case $__OCF_ACTION in
	meta-data)
		metadata
		exit $OCF_SUCCESS
		;;
	usage|help)
		echo $USAGE
		exit $OCF_SUCCESS
		;;
esac

if ! ocf_is_root; then
	ocf_log err "You must be root for $__OCF_ACTION operation."
	exit $OCF_ERR_PERM
fi

osvol_validate

case $__OCF_ACTION in
	start)
		osvol_start;;
	stop)
		osvol_stop;;
	monitor|status)
		osvol_monitor;;
	validate-all)
		exit $?;;
	*)
		echo $USAGE
		exit $OCF_ERR_UNIMPLEMENTED
		;;
esac
