clusterutilization

#!/bin/bash
#
# This tool returns the most recent cluster utilization percentage data
# from the specified json file.

jfile="/groups/scicomp/reports/ClusterLoad/cluster_usage.json"
threshold=50

function fullhelp {
    cat <<EOF

Cluster Utilization Tool

This tool returns the current (up to 60s old) cluster slot utilization
percentage as an integer. Supplying the '-t' argument will cause it to
return true (exit code = 0) or false (exit code = 1) if the current
utilization is less than the reduced rate chargeback threshold ($threshold).

`basename $0`: `basename $0` [-h] [-t]

You can optionally specify one of the following options:

    -h - displays this help screen

    -t - tests if current utilization percentage is less than
	     threshold ($threshold) and returns appropriate exit code

With no options given, an integer is returned.

EOF
exit 0
}

function percent {
	perc=$(tail -2 $jfile | awk -F, '/^\[/{sub("]","");print $2}')
	echo $(printf '%.0f' $perc)
	exit 0
}

function ttest {
	if [ "$(percent)" -lt "$threshold" ]; then
		exit 0
	else
		exit 1
	fi
}

function bad_input {
	echo "Usage: `basename $0` [-h] [-t]"
	echo "For additional help, run '`basename $0` -h'"
	exit 1
}

if [[ $# < 1 ]]; then
	percent
elif [[ $# = 1 ]]; then
	if [ $1 == '-h' ]; then
		fullhelp
	elif [ $1 == '-t' ]; then
		ttest
	else
		echo -e "Invalid argument.\n"
		bad_input
	fi
else
	echo -e "Too many arguments.\n"
	bad_input
fi