#!/bin/bash

# -------------------------------------------------------------------------- #
# Copyright 2002-2021, 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.                                             #
#--------------------------------------------------------------------------- #

################################################################################
# Initialization
################################################################################

ERROR=0

if [ -z $ONEGATE_TOKEN ]; then
    echo "ONEGATE_TOKEN env variable must point to the token.txt file"
    ERROR=1
fi

if [ -z $ONEGATE_URL ]; then
    echo "ONEGATE_URL env variable must be set"
    ERROR=1
fi

if [ $ERROR = 1 ]; then
    exit -1
fi

TMP_DIR=`mktemp -d`
echo "" > $TMP_DIR/metrics

################################################################################
# Memory metrics
################################################################################

MEM_TOTAL=`grep MemTotal: /proc/meminfo | awk '{print $2}'`
MEM_FREE=`grep MemFree: /proc/meminfo | awk '{print $2}'`
MEM_USED=$(($MEM_TOTAL-$MEM_FREE))

MEM_USED_PERC="0"

if ! [ -z $MEM_TOTAL ] && [ $MEM_TOTAL -gt 0 ]; then
    MEM_USED_PERC=`echo "$MEM_USED $MEM_TOTAL" | \
        awk '{ printf "%.2f", 100 * $1 / $2 }'`
fi

SWAP_TOTAL=`grep SwapTotal: /proc/meminfo | awk '{print $2}'`
SWAP_FREE=`grep SwapFree: /proc/meminfo | awk '{print $2}'`
SWAP_USED=$(($SWAP_TOTAL - $SWAP_FREE))

SWAP_USED_PERC="0"

if ! [ -z $SWAP_TOTAL ] && [ $SWAP_TOTAL -gt 0 ]; then
    SWAP_USED_PERC=`echo "$SWAP_USED $SWAP_TOTAL" | \
        awk '{ printf "%.2f", 100 * $1 / $2 }'`
fi


#echo "MEM_TOTAL = $MEM_TOTAL" >> $TMP_DIR/metrics
#echo "MEM_FREE = $MEM_FREE" >> $TMP_DIR/metrics
#echo "MEM_USED = $MEM_USED" >> $TMP_DIR/metrics
echo "MEM_USED_PERC = $MEM_USED_PERC" >> $TMP_DIR/metrics

#echo "SWAP_TOTAL = $SWAP_TOTAL" >> $TMP_DIR/metrics
#echo "SWAP_FREE = $SWAP_FREE" >> $TMP_DIR/metrics
#echo "SWAP_USED = $SWAP_USED" >> $TMP_DIR/metrics
echo "SWAP_USED_PERC = $SWAP_USED_PERC" >> $TMP_DIR/metrics

################################################################################
# Disk metrics
################################################################################

/bin/df -k -P | grep '^/dev' > $TMP_DIR/df

cat $TMP_DIR/df | while read line; do
    NAME=`echo $line | awk '{print $1}' | awk -F '/' '{print $NF}'`

    DISK_TOTAL=`echo $line | awk '{print $2}'`
    DISK_USED=`echo $line | awk '{print $3}'`
    DISK_FREE=`echo $line | awk '{print $4}'`

    DISK_USED_PERC="0"

    if ! [ -z $DISK_TOTAL ] && [ $DISK_TOTAL -gt 0 ]; then
        DISK_USED_PERC=`echo "$DISK_USED $DISK_TOTAL" | \
            awk '{ printf "%.2f", 100 * $1 / $2 }'`
    fi

    #echo "DISK_TOTAL_$NAME = $DISK_TOTAL" >> $TMP_DIR/metrics
    #echo "DISK_FREE_$NAME = $DISK_FREE" >> $TMP_DIR/metrics
    #echo "DISK_USED_$NAME = $DISK_USED" >> $TMP_DIR/metrics
    echo "DISK_USED_PERC_$NAME = $DISK_USED_PERC" >> $TMP_DIR/metrics
done

################################################################################
# PUT command
################################################################################

curl -X "PUT" --header "X-ONEGATE-TOKEN: `cat $ONEGATE_TOKEN`" $ONEGATE_URL \
    --data-binary @$TMP_DIR/metrics