#!/bin/bash

STATS_DIR='/tmp/iostats/<%= @disk %>'
PREVIOUS_FILE="$STATS_DIR/previous"
CURRENT_FILE="$STATS_DIR/current"
DISK_TO_MONITOR='<%= @disk %>'

if [ ! -d $STATS_DIR ]; then
	mkdir -p $STATS_DIR
fi

if [ ! -e $PREVIOUS_FILE ]; then
        iostat -d -k | grep $DISK_TO_MONITOR > $CURRENT_FILE
        cp $CURRENT_FILE $PREVIOUS_FILE
else
        cp $CURRENT_FILE $PREVIOUS_FILE
        iostat -d -k | grep $DISK_TO_MONITOR > $CURRENT_FILE
fi

CURRENT_TPS=`cat ${CURRENT_FILE} | awk '{print $2}'`
PREVIOUS_TPS=`cat ${PREVIOUS_FILE} | awk '{print $2}'`

CURRENT_BLK_READ_PER_S=`cat ${CURRENT_FILE} | awk '{print $3}'`
PREVIOUS_BLK_READ_PER_S=`cat ${PREVIOUS_FILE} | awk '{print $3}'`

CURRENT_BLK_WRITE_PER_S=`cat ${CURRENT_FILE} | awk '{print $4}'`
PREVIOUS_BLK_WRITE_PER_S=`cat ${PREVIOUS_FILE} | awk '{print $4}'`

CURRENT_BLK_READ=`cat ${CURRENT_FILE} | awk '{print $5}'`
PREVIOUS_BLK_READ=`cat ${PREVIOUS_FILE} | awk '{print $5}'`

CURRENT_BLK_WRITE=`cat ${CURRENT_FILE} | awk '{print $6}'`
PREVIOUS_BLK_WRITE=`cat ${PREVIOUS_FILE} | awk '{print $6}'`

BLK_READ=`echo "$CURRENT_BLK_READ - $PREVIOUS_BLK_READ" | bc`
BLK_WRITE=`echo "$CURRENT_BLK_WRITE - $PREVIOUS_BLK_WRITE" | bc`

TOTAL_READS=`cat ${CURRENT_FILE} | awk '{print $5}'`
TOTAL_WRITES=`cat ${CURRENT_FILE} | awk '{print $5}'`


echo -e "Transactions: ${CURRENT_TPS}/s"
echo -e "Writes/s: ${CURRENT_BLK_WRITE_PER_S} KB/s"
echo -e "Writes since last check: ${BLK_WRITE} KB"
echo -e "Writes total: ${TOTAL_WRITES} KB"
echo -e "Reads/s: ${CURRENT_BLK_READ_PER_S} KB/s"
echo -e "Reads since last check: ${BLK_READ} KB"
echo -e "Reads total: ${TOTAL_READS} KB"

gmetric -tuint8 -x180 -n"<%= @disk %>_transactions_per_second" -v$CURRENT_TPS
gmetric -tfloat -x180 -uKilobytes -n"<%= @disk %>_writes_per_second" -v$CURRENT_BLK_WRITE_PER_S
gmetric -tfloat -x180 -uKilobytes -n"<%= @disk %>_reads_per_second" -v$CURRENT_BLK_READ_PER_S
gmetric -tfloat -x180 -uKilobytes -n"<%= @disk %>_writes" -v$BLK_WRITE
gmetric -tfloat -x180 -uKilobytes -n"<%= @disk %>_reads" -v$BLK_READ
gmetric -tfloat -x180 -uKilobytes -n"<%= @disk %>_total_writes" -v$TOTAL_WRITES
gmetric -tfloat -x180 -uKilobytes -n"<%= @disk %>_total_reads" -v$TOTAL_READS