Created
August 6, 2018 08:51
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Non-blocking disk stats using Mojolicious Framework
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#!/usr/bin/env perl | |
use Mojo::Base -strict; | |
use Mojo::File 'path'; | |
use Mojo::Collection 'c'; | |
use Mojo::IOLoop; | |
use Mojo::JSON 'j'; | |
use Mojo::Util 'getopt'; | |
use Number::Bytes::Human; | |
BEGIN { | |
#only linux is supported ! | |
#!linux | |
die( sprintf( "OS %s not supported !\n", $^O ) ) if $^O ne 'linux'; | |
} | |
sub get_stats { | |
my $disk = shift; | |
return if !$disk; | |
my $file = q{/proc/diskstats}; | |
my $fh = path($file)->open('r+'); | |
while (<$fh>) { | |
chomp; | |
if (/$disk/ig) { | |
($_) = $_ =~ /^\s+(.*)$/; | |
close($fh) and return c( split(/\s+/) ); | |
} | |
} | |
close $fh; | |
return 0; | |
} | |
sub print_help { | |
my $usage = " | |
$0 -d [disk|partition] | |
options: -r|--recurring for recurring output (1s) | |
"; | |
printf( STDERR "%s\n", $usage ); | |
} | |
sub cls { | |
printf("\033[2J"); #clear the screen | |
printf("\033[0;0H"); #jump to 0,0 | |
} | |
getopt | |
'd|disk=s' => \my $disk, | |
'r|recurring' => \my $recurring; | |
print_help and die( sprintf("No partition or disk supplied !") ) if !$disk; | |
print_help and die( sprintf( "Not a block device: %s\n", qq{/dev/$disk} ) ) if !-b qq{/dev/$disk}; | |
my $get_stats; | |
$get_stats = sub { | |
my $delay = Mojo::IOLoop::Delay->new; | |
$delay->steps( | |
sub { | |
my $delay = shift; | |
my $collection = get_stats($disk); | |
if ( $collection and ref $collection eq 'Mojo::Collection' and $collection->size ) { | |
if ( my ( $reads, $writes ) = ( $collection->[5], $collection->[9] ) ) { | |
$delay->pass( $reads, $writes ); | |
} | |
} | |
else { $delay->pass; } | |
}, | |
sub { | |
my ( $delay, $reads, $writes ) = @_; | |
if ( $reads and $writes ) { | |
Mojo::IOLoop->timer( 1 => $delay->begin ); | |
$delay->pass( $reads, $writes ); | |
} | |
else { $delay->pass; } | |
}, | |
sub { | |
my ( $delay, $reads_prev, $writes_prev ) = @_; | |
my $h = Number::Bytes::Human->new( si => 0, bs => 1024 )->set_options( zero => '0B' ); | |
my $collection = get_stats($disk); | |
if ( $collection and ref $collection eq 'Mojo::Collection' and $collection->size ) { | |
if ( $reads_prev and $writes_prev ) { | |
if ( my ( $reads, $writes ) = ( $collection->[5], $collection->[9] ) ) { | |
printf( | |
"Disk: %s Read: %s Write: %s\n", | |
$disk, | |
$h->format( ( $reads - $reads_prev ) * 512 ), | |
$h->format( ( $writes - $writes_prev ) * 512 ) | |
); | |
} | |
} | |
} | |
cls and $get_stats->() if $recurring; | |
} | |
)->wait; | |
}; | |
$recurring ? ( cls and $get_stats->() ) : $get_stats->(); | |
Mojo::IOLoop->start unless Mojo::IOLoop->is_running; | |
1; |
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