anvil/Anvil/Tools/Get.pm

package Anvil::Tools::Get;
# 
# This module contains methods used to handle access to frequently used data.
# 

use strict;
use warnings;
use Scalar::Util qw(weaken isweak);
use Data::Dumper;
use Encode;
use UUID::Tiny qw(:std);
use Net::Netmask;
use JSON;

our $VERSION  = "3.0.0";
my $THIS_FILE = "Get.pm";

### Methods;
# anvil_version
# bridges
# cgi
# date_and_time
# free_memory
# host_type
# host_uuid
# md5sum
# os_type
# switches
# trusted_hosts
# uptime
# users_home
# uuid
# _salt
# _wrap_to

=pod

=encoding utf8

=head1 NAME

Anvil::Tools::Get

Provides all methods related to getting access to frequently used data.

=head1 SYNOPSIS

 use Anvil::Tools;

 # Get a common object handle on all Anvil::Tools modules.
 my $anvil = Anvil::Tools->new();
 
 # Access to methods using '$anvil->Get->X'. 
 # 
 # Example using 'date_and_time()';
 my $date = $anvil->Get->date_and_time({...});

=head1 METHODS

Methods in this module;

=cut
sub new
{
	my $class = shift;
	my $self  = {
		HOST	=>	{
			UUID	=>	"",
		},
	};
	
	bless $self, $class;
	
	return ($self);
}

# Get a handle on the Anvil::Tools object. I know that technically that is a sibling module, but it makes more 
# sense in this case to think of it as a parent.
sub parent
{
	my $self   = shift;
	my $parent = shift;
	
	$self->{HANDLE}{TOOLS} = $parent if $parent;
	
	# Defend against memory leads. See Scalar::Util'.
	if (not isweak($self->{HANDLE}{TOOLS}))
	{
		weaken($self->{HANDLE}{TOOLS});
	}
	
	return ($self->{HANDLE}{TOOLS});
}


#############################################################################################################
# Public methods                                                                                            #
#############################################################################################################

=head2 anvil_version

This reads to C<< VERSION >> file of a local or remote machine. If the version file isn't found, C<< 0 >> is returned. 

Parameters;

=head3 password (optional)

This is the password to use when connecting to a remote machine. If not set, but C<< target >> is, an attempt to connect without a password will be made.

=head3 port (optional)

This is the TCP port to use when connecting to a remote machine. If not set, but C<< target >> is, C<< 22 >> will be used.

=head3 remote_user (optional, default root)

If C<< target >> is set, this will be the user we connect to the remote machine as.

=head3 target (optional)

This is the IP or host name of the machine to read the version of. If this is not set, the local system's version is checked.

=cut
# NOTE: the version is set in anvil.spec by sed'ing the release and arch onto anvil.version in anvil-core's %post
sub anvil_version
{
	my $self      = shift;
	my $parameter = shift;
	my $anvil     = $self->parent;
	my $debug     = defined $parameter->{debug} ? $parameter->{debug} : 3;
	
	my $password    = defined $parameter->{password}    ? $parameter->{password}    : "";
	my $port        = defined $parameter->{port}        ? $parameter->{port}        : "";
	my $remote_user = defined $parameter->{remote_user} ? $parameter->{remote_user} : "root";
	my $target      = defined $parameter->{target}      ? $parameter->{target}      : "";
	my $version     = 0;
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 
		password    => $anvil->Log->is_secure($password),
		port        => $port, 
		remote_user => $remote_user, 
		target      => $target, 
	}});
	
	# Is this a local call or a remote call?
	if ($anvil->Network->is_local({host => $target}))
	{
		# Local.
		$version = $anvil->Storage->read_file({file => $anvil->data->{path}{configs}{'anvil.version'}});
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { version => $version }});
		
		# Did we actually read a version?
		if ($version eq "!!error!!")
		{
			$version = 0;
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 1, list => { version => $version }});
		}
	}
	else
	{
		### TODO: Remote calls are fragile. Move the version of dashboards into a variable to read from the database.
		# Remote call. If we're running as the apache user, we need to read the cached version for 
		# the peer. otherwise, after we read the version, will write the cached version.
		my $user       = getpwuid($<);
		my $cache_file = $anvil->data->{path}{directories}{anvil}."/anvil.".$target.".version";
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 
			cache_file => $cache_file, 
			user       => $user,
		}});
		if ($user eq "apache")
		{
			# Try to read the local cached version.
			if (-e $cache_file)
			{
				# Read it in.
				$version = $anvil->Storage->read_file({file => $cache_file});
				$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { version => $version }});
			}
		}
		else
		{
			my $shell_call = "
if [ -e ".$anvil->data->{path}{configs}{'anvil.version'}." ];
then
    cat ".$anvil->data->{path}{configs}{'anvil.version'}.";
else
   echo 0;
fi;
";
			$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => $debug, key => "log_0166", variables => { shell_call => $shell_call, target => $target, remote_user => $remote_user }});
			my ($output, $error, $return_code) = $anvil->Remote->call({
				debug       => $debug, 
				shell_call  => $shell_call, 
				target      => $target,
				port        => $port, 
				password    => $password,
				remote_user => $remote_user, 
			});
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 
				error  => $error,
				output => $output,
			}});
			
			$version = defined $output ? $output : "";
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { version => $version }});
			
			# Create/Update the cache file.
			if ($version)
			{
				my $update_cache = 1;
				my $old_version  = "";
				if (-e $cache_file)
				{
					$old_version = $anvil->Storage->read_file({file => $cache_file});
					$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { old_version => $old_version }});
					if ($old_version eq $version)
					{
						# No need to update
						$update_cache = 0;
					}
					else
					{
						
					}
				}
				
				$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { update_cache => $update_cache }});
				if ($update_cache)
				{
					$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 1, key => "log_0437", variables => { 
						target => $target, 
						file   => $cache_file, 
					}});
					$anvil->Storage->write_file({
						debug     => $debug, 
						file      => $cache_file, 
						body      => $version,
						mode      => "0666",
						overwrite => 1,
					});
				}
			}
		}
	}
	
	# Clear off any newline.
	$version =~ s/\n//gs;
	
	return($version);
}

=head2 bridges

This finds a list of bridges on the host. Bridges that are found are stored is '

=cut
sub bridges
{
	my $self      = shift;
	my $parameter = shift;
	my $anvil     = $self->parent;
	my $debug     = defined $parameter->{debug} ? $parameter->{debug} : 3;
	$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => $debug, key => "log_0125", variables => { method => "Get->bridges()" }});
	
	my ($output, $return_code) = $anvil->System->call({shell_call => $anvil->data->{path}{exe}{bridge}." -json -details link show"});
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 
		output      => $output,
		return_code => $return_code, 
	}});
	
	# Delete any previously known data
	my $host = $anvil->_short_host_name();
	if (exists $anvil->data->{$host}{network}{bridges})
	{
		delete $anvil->data->{$host}{network}{bridges};
	};
	
	local $@;
	my $bridge_data = "";
	my $json        = JSON->new->allow_nonref;
	my $test        = eval { $bridge_data = $json->decode($output); };
	if (not $test)
	{
		# JSON parse failed.
		$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 0, key => "error_0140", variables => { 
			json  => $output,
			error => $@,
		}});
		$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 1, key => "log_0519"});
		
		# NOTE: This is not design to be normally used. It was created as a stop-gap while waiting 
		#       for resolution on: https://bugzilla.redhat.com/show_bug.cgi?id=1868467
		my ($output, $return_code) = $anvil->System->call({shell_call => $anvil->data->{path}{exe}{bridge}." -details link show"});
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 
			output      => $output,
			return_code => $return_code, 
		}});
		my $interface = "";
		my $type      = "";
		foreach my $line (split/\n/, $output)
		{
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { line => $line }});
			if ($line =~ /^\d+:\s+(.*?):/)
			{
				$interface = $1;
				$type      = "";
				$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 
					interface => $interface,
					type      => $type, 
				}});
				
				$anvil->data->{$host}{network}{bridges}{bridge}{$interface}{found} = 1;
				$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 
					"${host}::network::bridges::bridge::${interface}::found" => $anvil->data->{$host}{network}{bridges}{bridge}{$interface}{found}, 
				}});
			}
			if ($interface)
			{
				if (($line =~ /master (.*?) /) or ($line =~ /master (.*?)$/))
				{
					my $master_bridge = $1;
					$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { master_bridge => $master_bridge }});
					
					if ($master_bridge eq $interface)
					{
						# This is the bridge
						$type = "bridge";
						$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { type => $type }});
					}
					else
					{
						# It's an interface, store it under the bridge.
						$type                                                                                            = "interface";
						$anvil->data->{$host}{network}{bridges}{bridge}{$master_bridge}{connected_interface}{$interface} = 1;
						$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 
							type                                                                                     => $type,
							"${host}::network::bridges::bridge::${master_bridge}::connected_interface::${interface}" => $anvil->data->{$host}{network}{bridges}{bridge}{$master_bridge}{connected_interface}{$interface}, 
						}});
					}
				}
			}
			
			if (($interface) && ($type))
			{
				if ($line =~ /<(.*?)>/)
				{
					my $flags = $1;
					$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { flags => $flags }});
					
					my $i = 0;
					foreach my $flag (split/,/, $flags)
					{
						$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { flag => $flag }});
						push @{$anvil->data->{$host}{network}{bridges}{$type}{$interface}{flags}}, $flag;
					}
				}
			}
			if ($line =~ /^\s+(.*?)$interface/)
			{
				# Break out settings.
				my $values = $1;
				$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 'values' => $values }});
				
				my $variable = "";
				foreach my $word (split/ /, $values)
				{
					if (($variable) && (($word eq "on") or ($word eq "off")))
					{
						my $value = $word;
						$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { value => $value }});
						
						$anvil->data->{$host}{network}{bridges}{$type}{$interface}{$variable} = $value eq "on" ? "true" : "false";
						$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 
							"${host}::network::bridges::${type}::${interface}::${variable}" => $anvil->data->{$host}{network}{bridges}{$type}{$interface}{$variable}, 
						}});
						$variable = "";
					}
					else
					{
						$variable = $word;
						$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { variable => $variable }});
					}
				}
			}
		}
	}
	else
	{
		foreach my $hash_ref (@{$bridge_data})
		{
			# If the ifname and master are the same, it's a bridge.
			my $type          = "interface";
			my $interface     = $hash_ref->{ifname};
			my $master_bridge = $hash_ref->{master};
			if ($interface eq $master_bridge)
			{
				$type = "bridge";
				$anvil->data->{$host}{network}{bridges}{bridge}{$interface}{found} = 1;
				$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 
					"${host}::network::bridges::bridge::${interface}::found" => $anvil->data->{$host}{network}{bridges}{bridge}{$interface}{found}, 
				}});
			}
			else
			{
				# Store this interface under the bridge.
				$anvil->data->{$host}{network}{bridges}{bridge}{$master_bridge}{connected_interface}{$interface} = 1;
				$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 
					"${host}::network::bridges::bridge::${master_bridge}::connected_interface::${interface}" => $anvil->data->{$host}{network}{bridges}{bridge}{$master_bridge}{connected_interface}{$interface}, 
				}});
			}
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 
				interface     => $interface,
				master_bridge => $master_bridge, 
				type          => $type, 
			}});
			foreach my $key (sort {$a cmp $b} keys %{$hash_ref})
			{
				if (ref($hash_ref->{$key}) eq "ARRAY")
				{
					$anvil->data->{$host}{network}{bridges}{$type}{$interface}{$key} = [];
					foreach my $value (sort {$a cmp $b} @{$hash_ref->{$key}})
					{
						push @{$anvil->data->{$host}{network}{bridges}{$type}{$interface}{$key}}, $value;
					}
					for (my $i = 0; $i < @{$anvil->data->{$host}{network}{bridges}{$type}{$interface}{$key}}; $i++)
					{
						$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 
							"${host}::network::bridges::${type}::${interface}::${key}->[$i]" => $anvil->data->{$host}{network}{bridges}{$type}{$interface}{$key}->[$i], 
						}});
					}
				}
				else
				{
					$anvil->data->{$host}{network}{bridges}{$type}{$interface}{$key} = $hash_ref->{$key};
					$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 
						"${host}::network::bridges::${type}::${interface}::${key}" => $anvil->data->{$host}{network}{bridges}{$type}{$interface}{$key}, 
					}});
				}
			}
		}
	}
	
	# Summary of found bridges.
	foreach my $interface (sort {$a cmp $b} keys %{$anvil->data->{$host}{network}{bridges}{bridge}})
	{
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 
			"${host}::network::bridges::bridge::${interface}::found" => $anvil->data->{$host}{network}{bridges}{bridge}{$interface}{found}, 
		}});
	}
	
	return(0);
}

=head2 cgi

This reads in the CGI variables passed in by a form or URL.

This method takes no parameters.

=cut
sub cgi
{
	my $self      = shift;
	my $parameter = shift;
	my $anvil     = $self->parent;
	my $debug     = defined $parameter->{debug} ? $parameter->{debug} : 3;
	
	# This will store all of the CGI variables.
	$anvil->data->{sys}{cgi_string} = "?";
	
	# Needed to read in passed CGI variables
	my $cgi = CGI->new();
	
	my $cgis      = [];
	my $cgi_count = 0;
	# Get the list of parameters coming in, if possible, 
	if (exists $cgi->{param})
	{
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 'cgi->{param}' => $cgi->{param} }});
		foreach my $variable (sort {$a cmp $b} keys %{$cgi->{param}})
		{
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { variable => $variable }});
			push @{$cgis}, $variable;
		}
	}
	
	$cgi_count = @{$cgis};
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { cgi_count => $cgi_count }});
	
	# If we don't have at least one variable, we're done.
	if ($cgi_count < 1)
	{
		return(0);
	}
	
	# NOTE: Later, we will have another array for handling file uploads.
	# Now read in the variables.
	foreach my $variable (sort {$a cmp $b} @{$cgis})
	{
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { variable => $variable }});
		
		$anvil->data->{cgi}{$variable}{value}       = "";
		$anvil->data->{cgi}{$variable}{mime_type}   = "string";
		$anvil->data->{cgi}{$variable}{file_handle} = "";
		$anvil->data->{cgi}{$variable}{file_name}   = "";
		$anvil->data->{cgi}{$variable}{alert}       = 0;	# This is set if a sanity check fails
		
		# This is a special CGI key for download files (upload from the user's perspective)
		if ($variable eq "upload_file")
		{
			if (not $cgi->upload('upload_file'))
			{
				# Empty file passed, looks like the user forgot to select a file to upload.
				$anvil->Log->entry({log_level => 2, message_key => "log_0242", file => $THIS_FILE, line => __LINE__});
			}
			else
			{
				   $anvil->data->{cgi}{upload_file}{file_handle} = $cgi->upload('upload_file');
				my $file                                         = $anvil->data->{cgi}{upload_file}{file_handle};
				   $anvil->data->{cgi}{upload_file}{file_name}   = $file;
				   $anvil->data->{cgi}{upload_file}{mime_type}   = $cgi->uploadInfo($file)->{'Content-Type'};
				$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 2, list => { 
					variable                                => 'upload_file',
					"cgi::${variable}::file_handle"         => $anvil->data->{cgi}{upload_file}{file_handle},
					"cgi::${variable}::file_handle->handle" => $anvil->data->{cgi}{upload_file}{file_handle}->handle,
					"cgi::${variable}::file_name"           => $anvil->data->{cgi}{upload_file}{file_name},
					"cgi::${variable}::mime_type"           => $anvil->data->{cgi}{upload_file}{mime_type},
					"cgi->upload('upload_file')"            => $cgi->upload('upload_file'),
					"cgi->upload('upload_file')->handle"    => $cgi->upload('upload_file')->handle,
				}});
			}
		}
		
		if (defined $cgi->param($variable))
		{
			# Make this UTF8 if it isn't already.
			if (Encode::is_utf8($cgi->param($variable)))
			{
				$anvil->data->{cgi}{$variable}{value} = $cgi->param($variable);
				$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { "cgi::${variable}::value" => $anvil->data->{cgi}{$variable}{value} }});
			}
			else
			{
				$anvil->data->{cgi}{$variable}{value} = Encode::decode_utf8($cgi->param($variable));
				$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { "cgi::${variable}::value" => $anvil->data->{cgi}{$variable}{value} }});
			}
			
			# Append to 'sys::cgi_string', so long as the variable doesn't have 'passwd' or 'password' in it.
			if (($variable !~ /password/) && ($variable !~ /passwd/))
			{
				$anvil->data->{sys}{cgi_string} .= "$variable=".$anvil->data->{cgi}{$variable}{value}."&";
			}
		}
	}
	
	# This is a pretty way of displaying the passed-in CGI variables. It loops through all we've got and
	# sorts out the longest variable name. Then it loops again, appending '.' to shorter ones so that 
	# everything is lined up in the logs. This almost always prints, save for log level 0.
	if ($anvil->Log->level >= 1)
	{
		my $longest_variable = 0;
		foreach my $variable (sort {$a cmp $b} keys %{$anvil->data->{cgi}})
		{
			next if $anvil->data->{cgi}{$variable} eq "";
			if (length($variable) > $longest_variable)
			{
				$longest_variable = length($variable);
			}
		}
		
		# Now loop again.
		foreach my $variable (@{$cgis})
		{
			next if $anvil->data->{cgi}{$variable} eq "";
			my $difference   = $longest_variable - length($variable);
			my $say_value    = "value";
			if ($difference == 0)
			{
				# Do nothing
			}
			elsif ($difference == 1) 
			{
				$say_value .= " ";
			}
			elsif ($difference == 2) 
			{
				$say_value .= "  ";
			}
			else
			{
				my $dots      =  $difference - 2;
				   $say_value .= " ";
				for (1 .. $dots)
				{
					$say_value .= ".";
				}
				$say_value .= " ";
			}
			# This is always '1' as the passed-in variables are what we want to see.
			my $censored_value = $anvil->data->{cgi}{$variable}{value};
			if ((($variable =~ /passwd/) or ($variable =~ /password/)) && (not $anvil->Log->secure))
			{
				# This is a password and we're not logging sensitive data, obfuscate it.
				$censored_value = $anvil->Words->string({key => "log_0186"});
			}
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 1, list => { 
				"cgi::${variable}::$say_value" => $censored_value,
			}});
		}
	}
	
	# Clear the last &
	$anvil->data->{sys}{cgi_string} =~ s/&$//;
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { "sys::cgi_string" => $anvil->data->{sys}{cgi_string} }});
	
	return(0);
}

=head2 date_and_time

This method returns the date and/or time using either the current time, or a specified unix time.

NOTE: This only returns times in 24-hour notation.

=head2 Parameters;

=head3 date_only (optional)

If set, only the date will be returned (in C<< yyyy/mm/dd >> format).

=head3 file_name (optional)

When set, the date and/or time returned in a string more useful in file names. Specifically, it will replace spaces with 'C<< _ >>' and 'C<< : >>' and 'C<< / >>' for 'C<< - >>'. This will result in a string in the format like 'C<< yyyy-mm-dd_hh-mm-ss >>'.

=head3 offset (optional)

If set to a signed number, it will add or subtract the number of seconds from the 'C<< use_time >>' before processing.

=head3 use_time (optional)

This can be set to a unix timestamp. If it is not set, the current time is used.

=head3 time_only (optional)

If set, only the time will be returned (in C<< hh:mm:ss >> format).

=head3 use_utc (optional)

If set, C<< gmtime >> is used instead of C<< localtime >>. The effect of this is that GMTime (greenwhich mean time, UTC-0) is used instead of the local system's time zone.

=cut
sub date_and_time
{
	my $self      = shift;
	my $parameter = shift;
	my $anvil     = $self->parent;
	my $debug     = defined $parameter->{debug} ? $parameter->{debug} : 3;
	
	my $offset    = defined $parameter->{offset}    ? $parameter->{offset}    : 0;
	my $use_time  = defined $parameter->{use_time}  ? $parameter->{use_time}  : time;
	my $use_utc   = defined $parameter->{use_utc}   ? $parameter->{use_utc}   : 0;
	my $file_name = defined $parameter->{file_name} ? $parameter->{file_name} : 0;
	my $time_only = defined $parameter->{time_only} ? $parameter->{time_only} : 0;
	my $date_only = defined $parameter->{date_only} ? $parameter->{date_only} : 0;
	
	### NOTE: This is used too early for normal error handling.
	# Are things sane?
	if ($use_time =~ /D/)
	{
		die "Get->date_and_time() was called with 'use_time' set to: [$use_time]. Only a unix timestamp is allowed.\n";
	}
	if ($offset =~ /D/)
	{
		die "Get->date_and_time() was called with 'offset' set to: [$offset]. Only real number is allowed.\n";
	}
	
	# Do my initial calculation.
	my $return_string = "";
	my $time          = {};
	my $adjusted_time = $use_time + $offset;
	#print $THIS_FILE." ".__LINE__."; [ Debug ] - adjusted_time: [$adjusted_time]\n";
	
	# Get the date and time pieces
	if ($use_utc)
	{
		($time->{sec}, $time->{min}, $time->{hour}, $time->{mday}, $time->{mon}, $time->{year}, $time->{wday}, $time->{yday}, $time->{isdst}) = gmtime($adjusted_time);
		#print $THIS_FILE." ".__LINE__."; [ Debug ] - time->{sec}: [".$time->{sec}."], time->{min}: [".$time->{min}."], time->{hour}: [".$time->{hour}."], time->{mday}: [".$time->{mday}."], time->{mon}: [".$time->{mon}."], time->{year}: [".$time->{year}."], time->{wday}: [".$time->{wday}."], time->{yday}: [".$time->{yday}."], time->{isdst}: [".$time->{isdst}."]\n";
	}
	else
	{
		($time->{sec}, $time->{min}, $time->{hour}, $time->{mday}, $time->{mon}, $time->{year}, $time->{wday}, $time->{yday}, $time->{isdst}) = localtime($adjusted_time);
		#print $THIS_FILE." ".__LINE__."; [ Debug ] - time->{sec}: [".$time->{sec}."], time->{min}: [".$time->{min}."], time->{hour}: [".$time->{hour}."], time->{mday}: [".$time->{mday}."], time->{mon}: [".$time->{mon}."], time->{year}: [".$time->{year}."], time->{wday}: [".$time->{wday}."], time->{yday}: [".$time->{yday}."], time->{isdst}: [".$time->{isdst}."]\n";
	}
	
	# Process the raw data
	$time->{pad_hour} = sprintf("%02d", $time->{hour});
	$time->{mon}++;
	$time->{pad_min}  = sprintf("%02d", $time->{min});
	$time->{pad_sec}  = sprintf("%02d", $time->{sec});
	$time->{year}     = ($time->{year} + 1900);
	$time->{pad_mon}  = sprintf("%02d", $time->{mon});
	$time->{pad_mday} = sprintf("%02d", $time->{mday});
	#print $THIS_FILE." ".__LINE__."; [ Debug ] - time->{pad_hour}: [".$time->{pad_hour}."], time->{pad_min}: [".$time->{pad_min}."], time->{pad_sec}: [".$time->{pad_sec}."], time->{year}: [".$time->{year}."], time->{pad_mon}: [".$time->{pad_mon}."], time->{pad_mday}: [".$time->{pad_mday}."], time->{mon}: [".$time->{mon}."]\n";
	
	# Now, the date and time separator depends on if 'file_name' is set.
	my $date_separator  = $file_name ? "-" : "/";
	my $time_separator  = $file_name ? "-" : ":";
	my $space_separator = $file_name ? "_" : " ";
	if ($time_only)
	{
		$return_string = $time->{pad_hour}.$time_separator.$time->{pad_min}.$time_separator.$time->{pad_sec};
		#print $THIS_FILE." ".__LINE__."; [ Debug ] - return_string: [$return_string]\n";
	}
	elsif ($date_only)
	{
		$return_string = $time->{year}.$date_separator.$time->{pad_mon}.$date_separator.$time->{pad_mday};
		#print $THIS_FILE." ".__LINE__."; [ Debug ] - return_string: [$return_string]\n";
	}
	else
	{
		$return_string = $time->{year}.$date_separator.$time->{pad_mon}.$date_separator.$time->{pad_mday}.$space_separator.$time->{pad_hour}.$time_separator.$time->{pad_min}.$time_separator.$time->{pad_sec};
		#print $THIS_FILE." ".__LINE__."; [ Debug ] - return_string: [$return_string]\n";
	}
	
	return($return_string);
}

=head2 host_name

This takes a host UUID and returns the host name (as recorded in the C<< hosts >> table). If the entry is not found, an empty string is returned.

Parameters;

=head3 host_uuid (required)

This is the C<< host_uuid >> to translate into a host name.

=cut
sub host_name
{
	my $self      = shift;
	my $parameter = shift;
	my $anvil     = $self->parent;
	my $debug     = defined $parameter->{debug} ? $parameter->{debug} : 3;
	
	my $host_name = "";
	my $host_uuid = defined $parameter->{host_uuid} ? $parameter->{host_uuid} : "";
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { host_uuid => $host_uuid }});
	
	my $query = "
SELECT 
    host_name 
FROM 
    hosts 
WHERE 
    host_uuid = ".$anvil->Database->quote($host_uuid).";
";
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { query => $query }});
	my $results = $anvil->Database->query({query => $query, source => $THIS_FILE, line => __LINE__});
	my $count   = @{$results};
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 
		results => $results, 
		count   => $count, 
	}});
	if ($count == 1)
	{
		# Found it
		$host_name = defined $results->[0]->[0] ? $results->[0]->[0] : "";
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { host_name => $host_name }});
	}
	
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { host_name => $host_name }});
	return($host_name);
}

=head2 free_memory

This returns, in bytes, host much free memory is available on the local system.

=cut
### TODO: Make this work on remote systems.
sub free_memory
{
	my $self      = shift;
	my $parameter = shift;
	my $anvil     = $self->parent;
	my $debug     = defined $parameter->{debug} ? $parameter->{debug} : 3;
	$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => $debug, key => "log_0125", variables => { method => "Get->free_memory()" }});
	
	my $available               = 0;
	my ($free_output, $free_rc) = $anvil->System->call({shell_call =>  $anvil->data->{path}{exe}{free}." --bytes"});
	foreach my $line (split/\n/, $free_output)
	{
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => 3, list => { line => $line }});
		if ($line =~ /Mem:\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+)\s+(\d+)$/)
		{
			my $total     = $1;
			my $used      = $2;
			my $free      = $3;
			my $shared    = $4;
			my $cache     = $5;
			   $available = $6;
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 
				total     => $total." (".$anvil->Convert->bytes_to_human_readable({'bytes' => $total})."})", 
				used      => $used." (".$anvil->Convert->bytes_to_human_readable({'bytes' => $used})."})",
				free      => $free." (".$anvil->Convert->bytes_to_human_readable({'bytes' => $free})."})", 
				shared    => $shared." (".$anvil->Convert->bytes_to_human_readable({'bytes' => $shared})."})", 
				cache     => $cache." (".$anvil->Convert->bytes_to_human_readable({'bytes' => $cache})."})", 
				available => $available." (".$anvil->Convert->bytes_to_human_readable({'bytes' => $available})."})", 
			}});
		}
	}
	
	return($available);
}

=head2 host_type

This method tries to determine the host type and returns a value suitable for use is the C<< hosts >> table.

 my $type = $anvil->System->host_type();

First, it looks to see if C<< sys::host_type >> is set and, if so, uses that string as it is. 

If that isn't set, it then looks to see if the file C<< /etc/anvil/type.X >> exists, where C<< X >> is C<< node >>, C<< striker >> or C<< dr >>. If found, the appropriate type is returned.

If that file doesn't exist, then it then checks to see which C<< anvil-<type> >> rpm is installed. In order, it looks for C<< anvil-striker >>, then C<< anvil-node >> and finally C<< anvil-dr >>. If one of them is found, the appropriate C<< /etc/anvil/type.X >> is created.

=cut
sub host_type
{
	my $self      = shift;
	my $parameter = shift;
	my $anvil     = $self->parent;
	my $debug     = defined $parameter->{debug} ? $parameter->{debug} : 3;
	$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => $debug, key => "log_0125", variables => { method => "Get->host_type()" }});
	
	my $host_type = "";
	my $host_name = $anvil->_short_host_name;
	   $host_type = "unknown";
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 
		host_type        => $host_type,
		host_name        => $host_name,
		"sys::host_type" => $anvil->data->{sys}{host_type},
	}});

	if ($anvil->data->{sys}{host_type})
	{
		$host_type = $anvil->data->{sys}{host_type};
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { host_type => $host_type }});
	}
	else
	{
		# Can I determine it by seeing a file?
		if (-e $anvil->data->{path}{configs}{'type.node'})
		{
			$host_type = "node";
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { host_type => $host_type }});
		}
		elsif (-e $anvil->data->{path}{configs}{'type.striker'})
		{
			$host_type = "striker";
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { host_type => $host_type }});
		}
		elsif (-e $anvil->data->{path}{configs}{'type.dr'})
		{
			$host_type = "dr";
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { host_type => $host_type }});
		}
		else
		{
			# Last gasp here is to use 'rpm' to see which RPMs are installed. If we find one, 
			# we'll touch 'type.X' file
			my $check_types = {
				'striker' => 1,
				'node'    => 1,
				'dr'      => 1,
			};
			foreach my $rpm ("anvil-striker", "anvil-node", "anvil-dr")
			{
				my ($output, $return_code) = $anvil->System->call({
					debug      => $debug, 
					shell_call => $anvil->data->{path}{exe}{rpm}." -q ".$rpm,
				});
				$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { output => $output, return_code => $return_code }});
				if ($return_code eq "0")
				{
					# Found out what we are.
					if ($output =~ /anvil-(.*?)-/)
					{
						$host_type = $1;
						$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { host_type => $host_type }});
						
						$check_types->{$host_type} = 0;
						$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { "check_types->{$host_type}" => $check_types->{$host_type} }});
					}
					
					my $key  = "type.".$host_type;
					my $file = $anvil->data->{path}{configs}{$key};
					$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 
						key  => $key,
						file => $file, 
					}});
					# If we have a file and we're root, touch to the file.
					if (($< == 0) or ($> == 0))
					{
						foreach my $test_type (sort {$a cmp $b} keys %{$check_types})
						{
							my $test_key  = "type.".$test_type;
							my $test_file = $anvil->data->{path}{configs}{$test_key};
							$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 
								"check_types->{$test_type}" => $check_types->{$test_type},
								test_file                   => $test_file,
							}});
							
							if (($check_types->{$test_type}) && (-e $test_file))
							{
								# Remove the old type.
								$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 1, key => "log_0497", variables => { file => $test_file }});
								unlink $test_file;
							}
						}
						if ($file)
						{
							my $error = $anvil->Storage->write_file({
								debug => $debug,
								body  => "",
								file  => $file,
							});
							$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { error => $error }});
						}
					}
					last;
				}
			}
		}
	}
	
	return($host_type);
}

=head2 host_uuid

This returns the local host's system UUID (as reported by 'dmidecode'). If the host UUID isn't available, and the program is not running with root priviledges, C<< #!error!# >> is returned.

 print "This host's UUID: [".$anvil->Get->host_uuid."]\n";

It is possible to override the local UUID, though it is not recommended.

 $anvil->Get->host_uuid({set => "720a0509-533d-406b-8fc1-03aca3e75fa7"})

=cut
sub host_uuid
{
	my $self      = shift;
	my $parameter = shift;
	my $anvil     = $self->parent;
	my $debug     = defined $parameter->{debug} ? $parameter->{debug} : 3;
	
	my $set = defined $parameter->{set} ? $parameter->{set} : "";
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 
		set          => $set,
		'HOST::UUID' => $anvil->{HOST}{UUID}, 
	}});
	
	if ($set)
	{
		$anvil->{HOST}{UUID} = $set;
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { "HOST::UUID" => $anvil->{HOST}{UUID} }});
	}
	elsif (not $anvil->{HOST}{UUID})
	{
		# Read /etc/anvil/host.uuid if it exists. If not, and if we're root, we'll create that file 
		# using the UUID from dmidecode.
		my $uuid = "";
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 
			'$<'                    => $<, 
			'$>'                    => $>,
			'path::data::host_uuid' => $anvil->data->{path}{data}{host_uuid}, 
		}});
		if (-e $anvil->data->{path}{data}{host_uuid})
		{
			# Read the UUID in
			$uuid = $anvil->Storage->read_file({debug => $debug, file => $anvil->data->{path}{data}{host_uuid}});
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { uuid => $uuid }});
		}
		elsif (($< == 0) or ($> == 0))
		{
			# Create the UUID file.
			($uuid, my $return_code) = $anvil->System->call({debug => $debug, shell_call => $anvil->data->{path}{exe}{dmidecode}." --string system-uuid"});
			$uuid = lc($uuid);
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 
				uuid        => $uuid, 
				return_code => $return_code,
			}});
		}
		else
		{
			# Host UUID file doesn't exist and I'm Not running as root, I'm done.
			# We're done.
			$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 0, priority => "err", key => "log_0187"});
			return("#!error!#");
		}
		
		if ($anvil->Validate->uuid({uuid => $uuid}))
		{
			$anvil->{HOST}{UUID} = $uuid;
			if (not -e $anvil->data->{path}{data}{host_uuid})
			{
				### TODO: This will need to set the proper SELinux context.
				# Apache run scripts can't call the system UUID, so we'll write it to a text
				# file.
				$anvil->Storage->write_file({
					debug     => $debug, 
					file      => $anvil->data->{path}{data}{host_uuid}, 
					body      => $uuid,
					user      => "apache", 
					group     => "apache",
					mode      => "0666",
					overwrite => 0,
				});
				$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 1, key => "message_0011", variables => { file => $anvil->data->{path}{configs}{'postgresql.conf'} }});
			}
		}
		else
		{
			# Bad UUID.
			$anvil->{HOST}{UUID} = "";
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { "HOST::UUID" => $anvil->{HOST}{UUID} }});
			
			$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 0, priority => "err", key => "log_0134", variables => { uuid => $uuid }});
			return("#!error!#");
		}
	}
	
	# We'll also store the host UUID in a variable.
	if ((not $anvil->data->{sys}{host_uuid}) && ($anvil->{HOST}{UUID}))
	{
		$anvil->data->{sys}{host_uuid} = $anvil->{HOST}{UUID};
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { "sys::host_uuid" => $anvil->data->{sys}{host_uuid} }});
	}
	
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { "HOST::UUID" => $anvil->{HOST}{UUID} }});
	return($anvil->{HOST}{UUID});
}

=head2 md5sum

This returns the C<< md5sum >> of a given file.

Parameters;

=head3 file

This is the full or relative path to the file. If the file doesn't exist, an empty string is returned.

=cut
sub md5sum
{
	my $self      = shift;
	my $parameter = shift;
	my $anvil     = $self->parent;
	my $debug     = defined $parameter->{debug} ? $parameter->{debug} : 3;
	
	my $sum = "";
	my $file = defined $parameter->{file} ? $parameter->{file} : "";
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { file => $file }});
	
	if (-e $file)
	{
		my $shell_call = $anvil->data->{path}{exe}{md5sum}." ".$file;
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { shell_call => $shell_call }});
		
		my ($return, $return_code) = $anvil->System->call({debug => $debug, shell_call => $shell_call});
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 'return' => $return, return_code => $return_code }});
		
		# split the sum off.
		$sum = ($return =~ /^(.*?)\s+$file$/)[0];
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { sum => $sum }});
	}
	
	return($sum);
}

=head2 os_type

This returns the operating system type and the system architecture as two separate string variables.

 # Run on RHEL 8, on a 64-bit system
 my ($os_type, $os_arch) = $anvil->Get->os_type();
 
 # '$os_type' holds 'rhel8'  ('rhel' or 'centos' + release version) 
 # '$os_arch' holds 'x86_64' (specifically, 'uname --hardware-platform')

If either can not be determined, C<< unknown >> will be returned.

This method takes no parameters.

=cut
sub os_type
{
	my $self      = shift;
	my $parameter = shift;
	my $anvil     = $self->parent;
	my $debug     = defined $parameter->{debug} ? $parameter->{debug} : 3;
	$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => $debug, key => "log_0125", variables => { method => "Get->os_type()" }});
	
	my $os_type = "unknown";
	my $os_arch = "unknown";
	
	### NOTE: Examples;
	# Red Hat Enterprise Linux release 8.0 Beta (Ootpa)
	# Red Hat Enterprise Linux Server release 7.5 (Maipo)
	# CentOS Linux release 7.5.1804 (Core) 

	# Read in the /etc/redhat-release file
	my $release = $anvil->Storage->read_file({file => $anvil->data->{path}{data}{'redhat-release'}});
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { release => $release }});
	if ($release =~ /Red Hat Enterprise Linux .* (\d+)\./)
	{
		# RHEL, with the major version number appended
		$os_type = "rhel".$1;
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { os_type => $os_type }});
	}
	elsif ($release =~ /CentOS .*? (\d+)\./)
	{
		# CentOS, with the major version number appended
		$os_type = "centos".$1;
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { os_type => $os_type }});
	}
	
	my ($output, $return_code) = $anvil->System->call({shell_call => $anvil->data->{path}{exe}{uname}." --hardware-platform"});
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { output => $output, return_code => $return_code }});
	if ($output)
	{
		$os_arch = $output;
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { os_arch => $os_arch }});
	}
	
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 
		os_type => $os_type, 
		os_arch => $os_arch,
	}});
	return($os_type, $os_arch);
}

=head2 switches

This reads in the command line switches used to invoke the parent program. 

It takes no arguments, and data is stored in 'C<< $anvil->data->{switches}{x} >>', where 'x' is the switch used.

Switches in the form 'C<< -x >>' and 'C<< --x >>' are treated the same and the corresponding 'C<< $anvil->data->{switches}{x} >>' will contain '#!set!#'. 

Switches in the form 'C<< -x foo >>', 'C<< --x foo >>', 'C<< -x=foo >>' and 'C<< --x=foo >>' are treated the same and the corresponding 'C<< $anvil->data->{switches}{x} >>' will contain 'foo'. 

The switches 'C<< -v >>', 'C<< -vv >>', 'C<< -vvv >>' and 'C<< -vvvv >>' will cause the active log level to automatically change to 1, 2, 3 or 4 respectively. Passing 'C<< -V >>' will set the log level to '0'.

Anything after 'C<< -- >>' is treated as a raw string and is not processed. 

=cut
### TODO: This doesn't handle quoted values, System->parse_arguments() does. Switch to using it. Note that 
###       we'll still need to process '--raw' here (or make it work there)
sub switches
{
	my $self      = shift;
	my $parameter = shift;
	my $anvil     = $self->parent;
	my $debug     = defined $parameter->{debug} ? $parameter->{debug} : 3;
	
	my $last_argument = "";
	foreach my $argument (@ARGV)
	{
		if ($last_argument eq "raw")
		{
			# Don't process anything.
			$anvil->data->{switches}{raw} .= " $argument";
		}
		elsif ($argument =~ /^-/)
		{
			# If the argument is just '--', appeand everything after it to 'raw'.
			if ($argument eq "--")
			{
				$last_argument                = "raw";
				$anvil->data->{switches}{raw} = "";
			}
			else
			{
				($last_argument) = ($argument =~ /^-{1,2}(.*)/)[0];
				if ($last_argument =~ /=/)
				{
					# Break up the variable/value.
					($last_argument, my $value) = (split /=/, $last_argument, 2);
					$anvil->data->{switches}{$last_argument} = $value;
				}
				else
				{
					$anvil->data->{switches}{$last_argument} = "#!SET!#";
				}
			}
		}
		else
		{
			if ($last_argument)
			{
				$anvil->data->{switches}{$last_argument} = $argument;
				$last_argument                           = "";
			}
			else
			{
				# Got a value without an argument, so just record it as '#!SET!#'.
				$anvil->data->{switches}{$argument} = "#!SET!#";
			}
		}
	}
	
	# Clean up the initial space added to 'raw'.
	if ($anvil->data->{switches}{raw})
	{
		$anvil->data->{switches}{raw} =~ s/^ //;
	}
	
	# Adjust the log level if requested.
	$anvil->Log->_adjust_log_level();
	
	return(0);
}

=head2 trusted_hosts

This returns an array reference containing host UUIDs of hosts this machine should trust. Specifically, any Striker dashboards this host uses, and if this host is in an Anvil!, the peers. The array will include this host's UUID as well.

This method takes no parameters

=cut
sub trusted_hosts
{
	my $self      = shift;
	my $parameter = shift;
	my $anvil     = $self->parent;
	my $debug     = defined $parameter->{debug} ? $parameter->{debug} : 3;
	$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => $debug, key => "log_0125", variables => { method => "Get->uptime()" }});
	
	my $local_host_uuid    = $anvil->Get->host_uuid;
	my $in_anvil           = $anvil->data->{hosts}{host_uuid}{$local_host_uuid}{anvil_name};
	my $trusted_host_uuids = [$local_host_uuid];
	foreach my $host_uuid (keys %{$anvil->data->{hosts}{host_uuid}})
	{
		# Skip ourselves.
		next if $host_uuid eq $anvil->Get->host_uuid;
		
		my $host_name  = $anvil->data->{hosts}{host_uuid}{$host_uuid}{host_name};
		my $host_type  = $anvil->data->{hosts}{host_uuid}{$host_uuid}{host_type};
		my $anvil_name = $anvil->data->{hosts}{host_uuid}{$host_uuid}{anvil_name};
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 
			's1:host_uuid'  => $host_uuid, 
			's2:host_name'  => $host_name, 
			's3:host_type'  => $host_type, 
			's4:anvil_name' => $anvil_name, 
		}});
		if ($anvil->Get->host_type eq "striker")
		{
			# Add all known machines
			push @{$trusted_host_uuids}, $host_uuid;
		}
		elsif ((($in_anvil) && ($anvil_name eq $in_anvil)) or (exists $anvil->data->{database}{$host_uuid}))
		{
			# Add dashboards we use and peers
			push @{$trusted_host_uuids}, $host_uuid;
		}
	}
	
	return($trusted_host_uuids)
}

=head2 uptime

This returns, in seconds, how long the host has been up and running for. 

This method takes no parameters.

=cut
### TODO: Make this work on remote hosts
sub uptime
{
	my $self      = shift;
	my $parameter = shift;
	my $anvil     = $self->parent;
	my $debug     = defined $parameter->{debug} ? $parameter->{debug} : 3;
	$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => $debug, key => "log_0125", variables => { method => "Get->uptime()" }});
	
	my $uptime = $anvil->Storage->read_file({
		force_read => 1,
		cache      => 0,
		file       => $anvil->data->{path}{proc}{uptime},
	});
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { uptime => $uptime }});
	
	# Clean it up. We'll have gotten two numbers, the uptime in seconds (to two decimal places) and the 
	# total idle time. We only care about the int number.
	$uptime =~ s/^(\d+)\..*$/$1/;
	$uptime =~ s/\n//gs;
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { uptime => $uptime }});
	
	return($uptime);
}

=head2 users_home

This method takes a user's name and returns the user's home directory. If the home directory isn't found, C<< 0 >> is returned.

Parameters;

=head3 user (optional, default is the user name of the real UID (as stored in '$<'))

This is the user whose home directory you are looking for.

=cut
sub users_home
{
	my $self      = shift;
	my $parameter = shift;
	my $anvil     = $self->parent;
	my $debug     = defined $parameter->{debug} ? $parameter->{debug} : 3;
	
	my $home_directory = 0;
	
	my $user = defined $parameter->{user} ? $parameter->{user} : getpwuid($<);
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { user => $user }});
	
	# Make sure the user is only one digit. Sometimes $< (and others) will return multiple IDs.
	if ($user =~ /^\d+ \d$/)
	{
		$user =~ s/^(\d+)\s.*$/$1/;
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { user => $user }});
	}
	
	# If the user is numerical, convert it to a name.
	if ($user =~ /^\d+$/)
	{
		$user = getpwuid($user);
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { user => $user }});
	}
	
	# Still don't have a name? fail...
	if ($user eq "")
	{
		# No user? No bueno...
		$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 0, priority => "err", key => "log_0020", variables => { method => "Get->users_home()", parameter => "user" }});
		return($home_directory);
	}
	
	my $body = $anvil->Storage->read_file({file => $anvil->data->{path}{data}{passwd}});
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { body => $body }});
	foreach my $line (split /\n/, $body)
	{
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { line => $line }});
		if ($line =~ /^$user:/)
		{
			$home_directory = (split/:/, $line)[5];
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { home_directory => $home_directory }});
			last;
		}
	}
	
	# Do I have the a user's $HOME now?
	if (not $home_directory)
	{
		$anvil->Log->entry({source => $THIS_FILE, line => __LINE__, level => 0, priority => "err", key => "log_0061", variables => { user => $user }});
	}
	
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { home_directory => $home_directory }});
	return($home_directory);
}

=head2 uuid

This method returns a new v4 UUID (using 'UUID::Tiny').

Parameters;

=head3 short (optional, default '0')

This returns just the first 8 bytes of the uuid. For example, if the generated UUID is C<< 9e4b3f7c-5a98-40b6-9c34-84fdb24ddd30 >>, only C<< 9e4b3f7c >> is returned.

=cut
sub uuid
{
	my $self      = shift;
	my $parameter = shift;
	my $anvil     = $self->parent;
	my $debug     = defined $parameter->{debug} ? $parameter->{debug} : 3;
	
	my $short = defined $parameter->{short} ? $parameter->{short} : 0;
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 
		short => $short,
	}});
	
	my $uuid = create_uuid_as_string(UUID_RANDOM);
	$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { uuid => $uuid }});
	
	if ($short)
	{
		$uuid =~ s/^(\w+?)-.*$/$1/;
	}
	
	return($uuid);
}

# =head3
# 
# Private Functions;
# 
# =cut

#############################################################################################################
# Private functions                                                                                         #
#############################################################################################################

=head2 _salt

This generates a random salt string for use with internal Striker passwords.

=cut
sub _salt
{
	my $self      = shift;
	my $parameter = shift;
	my $anvil     = $self->parent;
	my $debug     = defined $parameter->{debug} ? $parameter->{debug} : 3;

	my $salt        = "";
	my $salt_length = $anvil->data->{sys}{password}{salt_length} =~ /^\d+$/ ? $anvil->data->{sys}{password}{salt_length} : 16;
	my @seed        = (" ", "~", "`", "!", "#", "^", "&", "*", "(", ")", "-", "_", "+", "=", "{", "[", "}", "]", "|", ":", ";", "'", ",", "<", ".", ">", "/");
	my @alpha       = ("a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z");
	my $seed_count  = @seed;
	my $alpha_count = @alpha;

	my $skip_count = 0;
	for (1..$salt_length)
	{
		# We want to have a little randomness in the salt length, but not skip tooooo many times.
		if ((int(rand(20)) == 2) && ($skip_count <= 3))
		{
			$skip_count++;
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { skip_count => $skip_count }});
			next;
		}
		
		# What character will this string be?
		my $this_integer = int(rand(3));
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { this_integer => $this_integer }});
		if ($this_integer == 0)
		{
			# Inject a random digit
			$salt .= int(rand(10));
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { salt => $salt }});
		}
		elsif ($this_integer == 1)
		{
			# Inject a random letter
			$salt .= $alpha[int(rand($alpha_count))];
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { salt => $salt }});
		}
		else
		{
			# Inject a random character
			$salt .= $seed[int(rand($seed_count))];
			$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { salt => $salt }});
		}
	}

	return($salt);
}


=head2 _wrap_to

This determines how wide the user's terminal currently is and returns that width, as well as store it in C<< sys::terminal::columns >>.

This takes no parameters. If there is a problem reading the column width, C<< 0 >> will be returned.

=cut
sub _wrap_to
{
	my $self      = shift;
	my $parameter = shift;
	my $anvil     = $self->parent;
	my $debug     = defined $parameter->{debug} ? $parameter->{debug} : 3;
	
	# Get the column width
	my ($columns, $return_code) = $anvil->System->call({debug => $debug, redirect_stderr => 0, shell_call => $anvil->data->{path}{exe}{tput}." cols" });
	if ((not defined $columns) or ($columns !~ /^\d+$/))
	{
		# Set 0.
		$columns = 0;
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { columns => $columns }});
	}
	else
	{
		# Got a good value
		$anvil->data->{sys}{terminal}{columns} = $columns;
		$anvil->Log->variables({source => $THIS_FILE, line => __LINE__, level => $debug, list => { 'sys::terminal::columns' => $anvil->data->{sys}{terminal}{columns} }});
	}

	return($columns);
}

1;