glass-isc-dhcp/routes/get_stats.js

var express = require('express');
var router  = express.Router();

router.get('/', function (req, res, next) {

	var json_file    = require('jsonfile');
	var glass_config = json_file.readFileSync('config/glass_config.json');

	const execSync = require('child_process').execSync;
	let output     = execSync('./bin/dhcpd-pools -c ' + glass_config.config_file + ' -l ' + glass_config.leases_file + ' -f j -A -s e');

	var dhcp_data = JSON.parse(output);

	for (var i = 0; i < dhcp_data['shared-networks'].length; i++) {
		utilization = round(parseFloat(dhcp_data['shared-networks'][i].used / dhcp_data['shared-networks'][i].defined) * 100, 2);
		if (isNaN(utilization))
			utilization = 0;

		dhcp_data['shared-networks'][i].utilization = utilization;
	}
	dhcp_data['shared-networks'].sort(function (a, b) {
		return parseFloat(b.utilization) - parseFloat(a.utilization);
	});

	let shared_networks = '';

	for (var i = 0; i < dhcp_data['shared-networks'].length; i++) {

		utilization = dhcp_data['shared-networks'][i].utilization;

		table_row = '';
		table_row = table_row + '<td><b>' + dhcp_data['shared-networks'][i].location + '</b></td>';
		table_row = table_row + '<td>' + dhcp_data['shared-networks'][i].used.toLocaleString('en') + ' (' + utilization + '%)</td>';
		table_row = table_row + '<td class="hide_col">' + dhcp_data['shared-networks'][i].defined.toLocaleString('en') + '</td>';
		table_row = table_row + '<td class="hide_col">' + dhcp_data['shared-networks'][i].free.toLocaleString('en') + '</td>';

		utilization_color = 'green';

		if (utilization >= 80)
			utilization_color = 'orange';
		if (utilization >= 90)
			utilization_color = 'red';

		table_row = table_row + '<td><div class="progress">' +
			'<div class="progress-bar bg-' + utilization_color + '" role="progressbar" aria-valuenow="62" aria-valuemin="0" aria-valuemax="100" style="width: ' + utilization + '%"></div>' +
			'</div></td>';

		shared_networks = shared_networks + '<tr>' + table_row + '</tr>';
	}

	/* Display All Subnets */
	for (var i = 0; i < dhcp_data.subnets.length; i++) {
		utilization = round(parseFloat(dhcp_data.subnets[i].used / dhcp_data.subnets[i].defined) * 100, 2);
		if (isNaN(utilization))
			utilization = 0;

		dhcp_data.subnets[i].utilization = utilization;
	}

	dhcp_data.subnets.sort(function (a, b) {
		return parseFloat(b.utilization) - parseFloat(a.utilization);
	});

	display_subnets = '';

	for (var i = 0; i < dhcp_data.subnets.length; i++) {
		utilization = dhcp_data.subnets[i].utilization;

		table_row = '';
		table_row = table_row + '<td><b>' + dhcp_data.subnets[i].location + '</b></td>';
		table_row = table_row + '<td>' + dhcp_data.subnets[i].range + '</td>';
		table_row = table_row + '<td>' + dhcp_data.subnets[i].used.toLocaleString('en') + ' (' + utilization + '%)</td>';
		table_row = table_row + '<td class="hide_col">' + dhcp_data.subnets[i].defined.toLocaleString('en') + '</td>';
		table_row = table_row + '<td class="hide_col">' + dhcp_data.subnets[i].free.toLocaleString('en') + '</td>';

		utilization_color = 'green';

		if (utilization >= 80)
			utilization_color = 'orange';
		if (utilization >= 90)
			utilization_color = 'red';

		table_row = table_row + '<td><div class="progress">' +
			'<div class="progress-bar bg-' + utilization_color + '" role="progressbar" aria-valuenow="62" aria-valuemin="0" aria-valuemax="100" style="width: ' + utilization + '%"></div>' +
			'</div></td>';

		display_subnets = display_subnets + '<tr>' + table_row + '</tr>';
	}

	total_leases = dhcp_data.summary.used.toLocaleString('en');

	let return_data = {
		"cpu_utilization":       cpu_utilization,
		"leases_used":           total_leases,
		"leases_per_second":     current_leases_per_second,
		"leases_per_minute":     leases_per_minute,
		"shared_network_table":  shared_networks,
		"host_name":             host_name,
		"display_subnets_table": display_subnets
	};

	res.setHeader('Content-Type', 'application/json');
	res.send(JSON.stringify(return_data));
});

module.exports = router;

function round(num, places) {
	var multiplier = Math.pow(10, places);
	return Math.round(num * multiplier) / multiplier;
}