#!/usr/bin/perl
# 
# This reports the total memory used by all processes with to passed-in program name.
# 
# The size in bytes is returned. If '0' is reported, check the exit code to see why.
# 
# This software was created by Alteeve's Niche! Inc. and has been released under the terms of the GNU GPL 
# version 2.
#
# https://alteeve.com
# 
# Exit Codes:
# 0  - Success
# 1  - No program name passed-in.
# 2  - No PIDs found for the passed-in program name.
# 3  - No PID returned by pgrep
# 

use strict;
use warnings;
use Anvil::Tools;

my $THIS_FILE           =  ($0 =~ /^.*\/(.*)$/)[0];
my $running_directory   =  ($0 =~ /^(.*?)\/$THIS_FILE$/)[0];
if (($running_directory =~ /^\./) && ($ENV{PWD}))
{
	$running_directory =~ s/^\./$ENV{PWD}/;
}

# Turn off buffering so that the pinwheel will display while waiting for the SSH call(s) to complete.
$| = 1;

my $anvil = Anvil::Tools->new({log_level => 2, log_secure => 1});

$anvil->data->{switches}{program} = ""; 
$anvil->Get->switches;
$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
	'switches::program' => $anvil->data->{switches}{program}, 
}});

$anvil->data->{memory}{total} = 0;

# If we weren't given a program, exit
if (not $anvil->data->{switches}{program})
{
	$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 0, key => "error_0065"});
	print "#!error!#\n";
	$anvil->nice_exit({exit_code => 1});
}

# Find the PID(s) of the program.
$anvil->data->{sys}{pids} = $anvil->System->pids({ignore_me => 1, program_name => $anvil->data->{switches}{program}});
$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 1, list => { 'sys::pids' => $anvil->data->{sys}{pids} }});

my $pids_found = @{$anvil->data->{sys}{pids}};
$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 1, list => { pids_found => $pids_found }});

if (not $pids_found)
{
	$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 1, level => 0, key => "error_0066", variables => { prorgram => $anvil->data->{switches}{program} }});
	print $anvil->data->{switches}{program}." = ".$anvil->data->{memory}{total}."\n";
	$anvil->nice_exit({exit_code => 2});
}

# Read in the smaps for each pid
foreach my $pid (sort {$a cmp $b} @{$anvil->data->{sys}{pids}})
{
	my $smaps_path = "/proc/".$pid."/smaps";
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 1, list => { smaps_path => $smaps_path }});
	
	# This will store the amount of RAM used by this specific PID.
	$anvil->data->{memory}{pid}{$pid} = 0;
	
	if (not -e $smaps_path)
	{
		# It is possible that the program just closed.
		$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, 'print' => 0, level => 1, key => "log_0433", variables => { pid => $pid }});
		next;
	}
	
	# Read in the file.
	my $body = $anvil->Storage->read_file({file => $smaps_path});
	foreach my $line (split/\n/, $body)
	{
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 3, list => { line => $line }});
		if ($line =~ /^Private_Dirty:\s+(\d+) (.*B)$/)
		{
			my $size = $1;
			my $type = $2;
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
				type => $type,
				size => $size,
			}});
			next if not $size;
			next if $size =~ /\D/;
			
			# This uses 'kB' for 'KiB' >_>
			$type =  lc($type);
			$type =~ s/b$/ib/ if $type !~ /ib$/;
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { type => $type }});
			
			my $size_in_bytes = $anvil->Convert->human_readable_to_bytes({size => $size, type => $type, base2 => 1});
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
				size_in_bytes => $anvil->Convert->add_commas({number => $size_in_bytes})." (".$anvil->Convert->bytes_to_human_readable({'bytes' => $size_in_bytes}).")",
			}});
			
			$anvil->data->{memory}{pid}{$pid} += $size_in_bytes;
			$anvil->data->{memory}{total}     += $size_in_bytes;
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
				"memory::pid::${pid}" => $anvil->Convert->add_commas({number => $anvil->data->{memory}{pid}{$pid}})." (".$anvil->Convert->bytes_to_human_readable({'bytes' => $anvil->data->{memory}{pid}{$pid}}).")",
				'memory::total'       => $anvil->Convert->add_commas({number => $anvil->data->{memory}{total}})." (".$anvil->Convert->bytes_to_human_readable({'bytes' => $anvil->data->{memory}{total}}).")",
			}});
		}
	}
}

# Report and exit.
print $anvil->data->{switches}{program}." = ".$anvil->data->{memory}{total}." # ".$anvil->Convert->bytes_to_human_readable({'bytes' => $anvil->data->{memory}{total}})."\n";
$anvil->nice_exit({exit_code => 0});