Option 2)
A callback would be simpler:
{
iterate {
my (
$env_name,
$platform_name,
$host_name,
$target_name,
$total_capacity,
$free_capacity,
) = @_;
local $, = "\t";
local $\ = "\n";
print $env_name,
$platform_name,
$host_name,
$target_name,
$total_capacity,
$free_capacity;
} $stuff;
}
sub iterate(&$) {
my ($callback, $envs) = @_;
while (my ($env_name, $platforms) = each %{$envs }) {
while (my ($platform_name, $hosts ) = each %{$platforms}) {
while (my ($host_name, $targets ) = each %{$hosts }) {
while (my ($target_name, $target ) = each %{$targets }) {
my $total_capacity = $target->{total_capacity};
my $free_capacity = $target->{free_capacity};
$callback->(
$env_name,
$platform_name,
$host_name,
$target_name,
$total_capacity,
$free_capacity,
);
}}}}
}
Tested.