#!/bin/bash

# -------------------------------------------------------------------------- #
# Copyright 2002-2019, OpenNebula Project, OpenNebula Systems                #
#                                                                            #
# Licensed under the Apache License, Version 2.0 (the "License"); you may    #
# not use this file except in compliance with the License. You may obtain    #
# a copy of the License at                                                   #
#                                                                            #
# http://www.apache.org/licenses/LICENSE-2.0                                 #
#                                                                            #
# Unless required by applicable law or agreed to in writing, software        #
# distributed under the License is distributed on an "AS IS" BASIS,          #
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   #
# See the License for the specific language governing permissions and        #
# limitations under the License.                                             #
#--------------------------------------------------------------------------- #

###############################################################################
# This script is used to monitor the free and used space of a datastore
###############################################################################

# -------- Set up the environment to source common tools & conf ------------

if [ -z "${ONE_LOCATION}" ]; then
    LIB_LOCATION=/usr/lib/one
else
    LIB_LOCATION=$ONE_LOCATION/lib
fi

. $LIB_LOCATION/sh/scripts_common.sh

DRIVER_PATH=$(dirname $0)
source ${DRIVER_PATH}/../../datastore/libfs.sh
source ${DRIVER_PATH}/../../efs_utils
# -------- Get datastore arguments from OpenNebula core ------------

DRV_ACTION=$1
ID=$2

efs_log_var "DRV_ACTION"
efs_log_var "ID"

XPATH="${DRIVER_PATH}/../../datastore/xpath.rb -b $DRV_ACTION"

unset i j XPATH_ELEMENTS

while IFS= read -r -d '' element; do
    XPATH_ELEMENTS[i++]="$element"
done < <($XPATH     /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/BRIDGE_LIST \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/POOL_NAME \
                    /DS_DRIVER_ACTION_DATA/DATASTORE/TEMPLATE/EC_POOL_NAME)

BRIDGE_LIST="${XPATH_ELEMENTS[j++]}"
POOL_NAME="${XPATH_ELEMENTS[j++]:-$POOL_NAME}"
EC_POOL_NAME="${XPATH_ELEMENTS[j++]}"

ZPOOL="$POOL_NAME"
HOST=`get_destination_host`

if [ -z "$HOST" ]; then
    error_message "Datastore template missing 'BRIDGE_LIST' attribute."
    exit -1
fi

[ -n "$EC_POOL_NAME" ] && POOL_NAME="$EC_POOL_NAME"

MONITOR_SCRIPT=$(cat <<EOF

USED_MB=\$(zpool list -H -p $ZPOOL 2>/dev/null | tail -n 1 | awk '{print \$3/1024/1024}')
TOTAL_MB=\$(zpool list -H -p $ZPOOL 2>/dev/null | tail -n 1 | awk '{print \$2/1024/1024}')
FREE_MB=\$(zpool list -H -p $ZPOOL 2>/dev/null | tail -n 1 | awk '{print \$4/1024/1024}')

if [ -z "\$USED_MB" -o -z "\$TOTAL_MB" -o -z "\$FREE_MB" ]; then
    msg="Empty value found"
    echo "\$msg: USED_MB=\$USED_MB, TOTAL_MB=\$TOTAL_MB, FREE_MB=\$FREE_MB"
    exit 1
fi

echo "USED_MB=\$USED_MB"
echo "FREE_MB=\$FREE_MB"
echo "TOTAL_MB=\$TOTAL_MB"
EOF
)

if [ -n "$BRIDGE_LIST" ]; then
    HOST=`get_destination_host`
    MONITOR_DATA=$(ssh_monitor_and_log "$HOST" "$MONITOR_SCRIPT" "Remote monitor script" 2>&1)
else
    MONITOR_DATA=$(monitor_and_log "$MONITOR_SCRIPT" "Monitor script" 2>&1)
fi

MONITOR_STATUS=$?

if [ "$MONITOR_STATUS" = "0" ]; then
    echo "$MONITOR_DATA" | tr ' ' '\n'
    exit 0
else
    echo "$MONITOR_DATA"
    exit $MONITOR_STATUS
fi

exit 0

