On Tuesday, November 15, 2011 at 11:10 , Stefan Wiederoder wrote:
> Hello list,
>
> I´m using a json config file to read a file with server group
> definitions, including group of groups like
> this example:
>
> [jdoe@belbo]# cat groups.json
> {
> "G_Group_PR" : [ "serverA", "serverB" ],
> "G_Group_QS" : [ "serverC", "serverD" ],
> "G_All" : [ "G_Group_PR", "G_Group_QS" ]
> }
>
> now I need to resolve all groups to their member servers to map
> actions to them.
>
> this is where I´m stuck with an elegant solution, how can I
> effectively parse this hash to
> replace all Groups (always starting with G_)?
>
I think you need to explain your desired outcome a bit further. I'm going to
assume you've got the JSON -> Perl data structure bit down, and what you want
to do is ask for 'G_All' and get back qw/ serverA serverB serverC serverD / --
is that correct?
If so, the big question becomes, how many levels of reference are you going to
support? If it's just a single level, like in your example, it's pretty easy:
my %resolved_hash;
foreach my $key ( keys %inital_hash ) {
foreach my $val ( @{ $initial_hash{$key} } ) {
if( $val =~ /^G_/ ) {
push @{ $resolved_hash{$key} } , @{ $inital_hash{$key} };
}
else { push @{ $resolved_hash{$key} } , $val }
}
}
(Caveat: untested, written while having first cup of coffee.)
If you want to support more than one level, you're going to want to have
something recursive -- dive down until there aren't any 'G_*' keys left, then
unwind.
chrs,
john.
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