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#!/usr/bin/env python
#
# $Id: iotop.py 1160 2011-10-14 18:50:36Z g.rodola@gmail.com $
#
# Copyright (c) 2009, Giampaolo Rodola'. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""
Shows real-time network statistics.
Author: Giampaolo Rodola' <g.rodola@gmail.com>
"""
import sys
import os
if os.name != 'posix':
sys.exit('platform not supported')
import curses
import atexit
import time
import psutil
# --- curses stuff
def tear_down():
win.keypad(0)
curses.nocbreak()
curses.echo()
curses.endwin()
win = curses.initscr()
atexit.register(tear_down)
curses.endwin()
lineno = 0
def print_line(line, highlight=False):
"""A thin wrapper around curses's addstr()."""
global lineno
try:
if highlight:
line += " " * (win.getmaxyx()[1] - len(line))
win.addstr(lineno, 0, line, curses.A_REVERSE)
else:
win.addstr(lineno, 0, line, 0)
except curses.error:
lineno = 0
win.refresh()
raise
else:
lineno += 1
# --- curses stuff
def bytes2human(n):
"""
>>> bytes2human(10000)
'9.8 K'
>>> bytes2human(100001221)
'95.4 M'
"""
symbols = ('K', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y')
prefix = {}
for i, s in enumerate(symbols):
prefix[s] = 1 << (i+1)*10
for s in reversed(symbols):
if n >= prefix[s]:
value = float(n) / prefix[s]
return '%.2f %s' % (value, s)
return '%.2f B' % (n)
def poll(interval):
"""Retrieve raw stats within an interval window."""
tot_before = psutil.net_io_counters()
pnic_before = psutil.net_io_counters(pernic=True)
# sleep some time
time.sleep(interval)
tot_after = psutil.net_io_counters()
pnic_after = psutil.net_io_counters(pernic=True)
return (tot_before, tot_after, pnic_before, pnic_after)
def refresh_window(tot_before, tot_after, pnic_before, pnic_after):
"""Print stats on screen."""
global lineno
# totals
print_line("total bytes: sent: %-10s received: %s" \
% (bytes2human(tot_after.bytes_sent),
bytes2human(tot_after.bytes_recv))
)
print_line("total packets: sent: %-10s received: %s" \
% (tot_after.packets_sent, tot_after.packets_recv)
)
# per-network interface details: let's sort network interfaces so
# that the ones which generated more traffic are shown first
print_line("")
nic_names = list(pnic_after.keys())
nic_names.sort(key=lambda x: sum(pnic_after[x]), reverse=True)
for name in nic_names:
stats_before = pnic_before[name]
stats_after = pnic_after[name]
templ = "%-15s %15s %15s"
print_line(templ % (name, "TOTAL", "PER-SEC"), highlight=True)
print_line(templ % (
"bytes-sent",
bytes2human(stats_after.bytes_sent),
bytes2human(stats_after.bytes_sent - stats_before.bytes_sent) + '/s',
))
print_line(templ % (
"bytes-recv",
bytes2human(stats_after.bytes_recv),
bytes2human(stats_after.bytes_recv - stats_before.bytes_recv) + '/s',
))
print_line(templ % (
"pkts-sent",
stats_after.packets_sent,
stats_after.packets_sent - stats_before.packets_sent,
))
print_line(templ % (
"pkts-recv",
stats_after.packets_recv,
stats_after.packets_recv - stats_before.packets_recv,
))
print_line("")
win.refresh()
lineno = 0
def main():
try:
interval = 0
while 1:
args = poll(interval)
refresh_window(*args)
interval = 1
except (KeyboardInterrupt, SystemExit):
pass
if __name__ == '__main__':
main()
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