#!/usr/local/bin/perl

# netapp-top - display current top NFS clients for a NetApp
# Copyright (C) 1998 Daniel Quinlan
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

$default_interval = 60;
$prog = $0;
$prog =~ s@.*/@@;

require "getopts.pl";
&Getopts("hi:");

if (defined $ENV{"LINES"} && $ENV{"LINES"} ne "") {
$lines = $ENV{"LINES"};
}
else {
$lines = 24;
}

if ($opt_h) {
&usage;
exit 0;
}
if ($opt_i && $opt_i > 0) {
$interval = $opt_i;
}
else {
$interval = $default_interval;
}

if ($ARGV[0]) {
$host = $ARGV[0];
}
else {
&usage;
exit 1;
}

sub usage {
print <<EOF;
usage: $prog [options] filer
-h print this help
-i n report filer statistics every n seconds ($default_interval 
is default)

* "options nfs.per_client_stats.enable" should be "on".
* You should have "rsh" access to the filer.

EOF
}

sub print_top {
my $total = 0;
my $diff;
my %recent;

foreach $key (keys %nfs_ops_last) {
$diff = $nfs_ops{$key} - $nfs_ops_last{$key};
$recent{$key} = $diff;
$total += $diff;
}
$total = int ($total / $interval);
system("clear");
printf "%6s\t%s\n", "NFS/s",
"total NFS/s = $total | interval = $interval";
printf "%6s\t%s\n", "------", "----------------------------------------";
$i = 0;
foreach $key (sort {$recent{$b} <=> $recent{$a} } keys %recent) {
printf "%6d\t%s\n", int ($recent{$key} / $interval + 0.5),
$ip_name{$key};
last if ($i++ > ($lines - 5));
}
}

$first = 1;
for (;;) {
$time_0 = time();
open(NFSSTAT, "rsh $host nfsstat -l|");
while (<NFSSTAT>) {
@tmp = split;

# ip_address = tmp[0]
# ip_name = tmp[1]
# nfs_ops = tmp[4]

# if hostname is "<hostname unknown>", we have two words,...
if($tmp[1] eq "<hostname") {
$ip_name{$tmp[0]} = $tmp[0];
$nfs_ops{$tmp[0]} = $tmp[5];
}
else {
$ip_name{$tmp[0]} = $tmp[1];
$nfs_ops{$tmp[0]} = $tmp[4];
}
 
}
close(NFSSTAT);
if (! $first) {
&print_top;
}
else {
$first = 0;
}
%nfs_ops_last = %nfs_ops;
$time_1 = time();
if((($time_1 - $time_0) > 1) && (($interval - ($time_1 - $time_0)) >= 0)) {
sleep ($interval - ($time_1 - $time_0)); 
}
else {
sleep ($interval);
}
}