net-speed.sh

#!/bin/bash

# Authors:
# - Moritz Warning <moritzwarning@web.de> (2016)
# - Zhong Jianxin <azuwis@gmail.com> (2014)
# - maximilize
#
# See file LICENSE at the project root directory for license information.
#
# Fork from https://github.com/i3/i3status/blob/master/contrib/net-speed.sh
# Use with xfce "Generic Monitor" applet.
#

readable() {
  local bytes=$1
  local kib=$(( bytes >> 10 ))
  if [ $kib -lt 0 ]; then
    echo "?k"
  elif [ $kib -gt 1024 ]; then
    local mib_int=$(( kib >> 10 ))
    local mib_dec=$(( kib % 1024 * 976 / 10000 ))
    if [ "$mib_dec" -lt 10 ]; then
      mib_dec="0${mib_dec}"
    fi
    echo "${mib_int}.${mib_dec}m"
  else
    echo "${kib}k"
  fi
}

update_rate() {
  if ! qvm-ls --no-spinner --raw-data --fields NAME,STATE,FLAGS 2>/dev/null | grep -q '^sys-net|Running|...N....$'; then
    echo "Offline"
    return
  fi

  local ifaces=$(qvm-run -p sys-net "ls /sys/class/net" | grep -E '^(eth|wlan|enp|wlp|wls)')

  local time=$(date +%s)
  local rx=0 tx=0 tmp_rx tmp_tx
  local rate=""

  for iface in $ifaces; do
    read tmp_rx tmp_tx < <(qvm-run -p sys-net "cat /sys/class/net/${iface}/statistics/{rx,tx}_bytes" | tr '\n' ' ')
    rx=$(( rx + tmp_rx ))
    tx=$(( tx + tmp_tx ))
  done

  if [ -e /run/qubes/network-status ]; then
    local last_time last_rx last_tx
    read last_time last_rx last_tx < <(cat /run/qubes/network-status)
    local interval=$(( $time - $last_time ))
    if [ $interval -gt 0 ]; then
      echo "$(readable $(( (rx - last_rx) / interval )))↓ $(readable $(( (tx - last_tx) / interval )))↑"
    fi
  fi

  echo "$time $rx $tx" >/run/qubes/network-status
}

update_rate