Perl - "Complex" Data Structure - perl

Question

I'm trying to get a workable data structure that I can pull the element values from in a sensible fashion. Just having great difficulty working with the data once its in the structure. This is how the struct is built:
sub hopCompare
{
my %count;
my %master;
my $index = 0;
foreach my $objPath (#latest) #get Path object out of master array
{
my #path = #{$objPath->_getHopList()}; #dereferencing
my $iter = 0;
foreach my $hop (#path)
{
++$count{$hop}->{FREQ};
$count{$hop}->{INDEX} = $index;
$count{$hop}->{NODE} = $hop;
$index++;
}
$index = 0;
}
foreach my $element( keys %count )
{
if (defined($count{$element}->{NODE}))
{
my $curr = $count{$element}->{INDEX};
my $freq = $count{$element}->{FREQ};
if (($freq > 1) || ($count{$element}->{INDEX} =~ /[0-1]/))
{
push #{ $master{$curr} }, {$count{$element}->{NODE}, {FREQ => $count{$element}->{FREQ}}};
}
print "$element = $count{$element}\n";
print "$element Index = $count{$element}->{INDEX}\n";
}
}
print "\n Master contains: \n" . Dumper (%master);
if (%master){return %master;} else {die "NO FINAL HOPS MATCHED";}
}
Producing this structure:
%Master contains:
$VAR1 = '4';
$VAR2 = [
{
'1.1.1.2' => {
'FREQ' => 2
}
}
];
$VAR3 = '1';
$VAR4 = [
{
'1.1.1.9' => {
'FREQ' => 5
}
},
{
'1.1.1.8' => {
'FREQ' => 1
}
}
];
{truncated}
Although ideally the structure should look like this but I had even less joy trying to pull data out at sub identifyNode:
$VAR1 = {
'1' => [
{
'1.1.1.9' => {
'FREQ' => 5
}
},
{
'1.1.5.8' => {
'FREQ' => 1
}
}
],
Then to get back at the data in another method I'm using:
sub identifyNode
{
my %hops = %{$_[0]};
my $i = 0;
foreach my $h ( keys %hops ) #The HOP-INDEX is the key
{
print "\n\$h looks like \n" . Dumper ($hops{$h});
my %host = %{ $hops{$h}[0] }; #Push the first HASH in INDEX to the %host HASH
foreach my $hip (keys %host)
{
my $corelink = `corelinks $hip`;
my ($node) = $corelink =~ /([a-z0-9-]+),[a-z0-9-\/]+,$hip/s;
print "\n\t\t\tHostname is $node\n";
}
$i++;
}
}
This then generates:
$h looks like
$VAR1 = [
{
'1.1.1.2' => {
'FREQ' => 2
}
}
];
Hostname is blabla-bla-a1
$h looks like
$VAR1 = [
{
'1.1.1.9' => {
'FREQ' => 5
}
},
{
'1.1.1.8' => {
'FREQ' => 1
}
}
];
Hostname is somew-some-a1
So for each hash in $h only the topmost host gets evaluated and hostname returned. This is because it is told to do so by the [0] in line:
my %host = %{ $hops{$h}[0] };
I've played around with different data structures and de-referencing the structure a multitude of ways and this is the only halfway house I've found...
(The IPs have been obfuscated so are not consistent in my examples)

Answer 1

Thanks for your advice it got me halfway there. It works now (in still somewhat a convoluted fashion!) :
sub identifyNode
{
my %hops = %{$_[0]};
my $i = 0;
my #fin_nodes;
my $hindex;
foreach my $h ( keys %hops ) #The HOP-INDEX is the key
{
$hindex = $h;
foreach my $e (#{$hops{$h}}) #first part of solution credit Zdim
{
my #host = %{ $e }; #second part of solution
my $hip = $host[0];
my $corelink = `corelinks $hip`;
my ($node) = $corelink =~ /([a-z0-9-]+),[a-z0-9-\/]+,$hip/s;
print "\n\t\t\tHostname is $node\n";
push (#fin_nodes, [$node, $hindex, $e->{$hip}->{FREQ}]);
}
$i++;
}
return (\#fin_nodes);
}
Am I brave enough to add the data as a hash to #fin_nodes.. hmm