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Add filter coderef support to limit recursion #1

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Sep 12, 2014
Merged

Add filter coderef support to limit recursion #1

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16 changes: 15 additions & 1 deletion lib/Graphite/Enumerator.pm
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@ use 5.14.1;
use Carp qw/croak/;
use LWP::UserAgent;
use JSON;
use Scalar::Util 'reftype';

our $VERSION = '0.01';

Expand All @@ -30,6 +31,9 @@ sub new {

sub enumerate {
my ($self, $callback, $path, $level) = @_;
if (reftype $callback ne "ARRAY") {
$callback = [ $callback ];
}
$path //= $self->{basepath};
$level //= 0;
my $url = $self->{_finder} . $path;
Expand All @@ -42,8 +46,9 @@ sub enumerate {
}
return 0 if !$completer_answer->{metrics};
for my $metric (@{ $completer_answer->{metrics} }) {
next if ($callback->[1] && $callback->[1]($metric->{path}, $level));
if ($metric->{is_leaf}) {
$callback->($metric->{path}, $level);
$callback->[0]($metric->{path}, $level);
}
else {
$self->enumerate($callback, $metric->{path}, $level + 1);
Expand Down Expand Up @@ -110,10 +115,19 @@ The constructor recognizes 3 arguments:

=head2 $g->enumerate($coderef)

=head2 $g->enumerate([ $coderef, $filter_coderef ])

Calls C<$coderef> for each metric under the basepath, with two parameters:
1. the metric name as a string; 2. the depth level of the metric relative
to the base path (starting at 0).

If an array reference of 2 coderefs is provided, the second coderef will be
used as a an input filter called with the same parameters as above. This will
allow, for instance, to stop recursion on a given path by providing a regex, or
to stop recursion past a certain level. The code should return false to allow
further processing, and true, indicating a match, to prevent further processing
along that path.

=head2 $g->host

Returns the host passed to the constructor (with eventually
Expand Down