Function getBandwidthSpeed

pkg/sysstats/sys.go:50–83

getBandwidthSpeed returns the aggregate incoming (rx) and outgoing (tx) bandwidth in bytes per second, sampled over a 1-second interval. Loopback interface (lo) is excluded from the calculation.

()

// bandwidth in bytes per second, sampled over a 1-second interval.
// Loopback interface (lo) is excluded from the calculation.
func getBandwidthSpeed() (uint64, uint64, error) {
	first, err := net.IOCounters(true)
	if err != nil {
		return 0, 0, err
	}

	time.Sleep(1 * time.Second)

	second, err := net.IOCounters(true)
	if err != nil {
		return 0, 0, err
	}

	prev := make(map[string]net.IOCountersStat, len(first))
	for _, c := range first {
		if c.Name == "lo" {
			continue
		}
		prev[c.Name] = c
	}

	var totalRxBytes, totalTxBytes uint64
	for _, c := range second {
		if c.Name == "lo" {
			continue
		}
		if p, ok := prev[c.Name]; ok {
			totalRxBytes += c.BytesRecv - p.BytesRecv
			totalTxBytes += c.BytesSent - p.BytesSent
		}
	}

	return totalRxBytes, totalTxBytes, nil
}