//
// Copyright (c) 2019 Ted Unangst <tedu@tedunangst.com>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

package main

import (
	"syscall"
	"time"

	"github.com/dustin/go-humanize"
)

type Sensors struct {
	Memory float64
	Uptime string
	CPU    float64
}

var boottime = time.Now()

func getSensors() Sensors {
	var usage syscall.Rusage
	syscall.Getrusage(syscall.RUSAGE_SELF, &usage)

	now := time.Now()

	var sensors Sensors
	sensors.Memory = float64(usage.Maxrss) / 1024.0
	sensors.Uptime = humanize.RelTime(boottime, now, "", "")
	sensors.CPU = time.Duration(usage.Utime.Nano()).Seconds()

	return sensors
}

func setLimits() error {
	var limit syscall.Rlimit
	limit.Cur = 2 * 1024 * 1024 * 1024
	limit.Max = 2 * 1024 * 1024 * 1024
	return syscall.Setrlimit(syscall.RLIMIT_DATA, &limit)
}