From b9f04c70a0c01f32f5896613e7347aa42be43b9b Mon Sep 17 00:00:00 2001
From: Steve Schnepp <steve.schnepp@gmail.com>
Date: Mon, 6 Feb 2012 18:18:40 +0100
Subject: [PATCH] - adding a CGI for a JSON-ified datafile

---
 tools/munin2json/cgi-bin/munin-cgi-datafile | 74 +++++++++++++++++++++
 1 file changed, 74 insertions(+)
 create mode 100644 tools/munin2json/cgi-bin/munin-cgi-datafile

diff --git a/tools/munin2json/cgi-bin/munin-cgi-datafile b/tools/munin2json/cgi-bin/munin-cgi-datafile
new file mode 100644
index 00000000..497a7bb2
--- /dev/null
+++ b/tools/munin2json/cgi-bin/munin-cgi-datafile
@@ -0,0 +1,74 @@
+#! /usr/bin/perl
+
+use warnings;
+use strict;
+
+use CGI;
+use Scalar::Util qw(isweak);
+
+use JSON;
+use Munin::Master::Utils;
+use Munin::Common::Defaults;
+
+my $conffile       = $Munin::Common::Defaults::MUNIN_CONFDIR . "/munin.conf";
+my $config = munin_config($conffile);
+
+
+# Header
+my $cgi = CGI->new();
+print $cgi->header(
+	-status => 200, 
+	-type => "application/json",
+	-expires=>'+5m',
+);
+
+# Body
+my $json = JSON->new->allow_nonref;
+
+# Remove all recursive refs
+remove_weak($config);
+
+print $json->pretty->encode($config);
+
+sub remove_weak {
+	my $cur = shift;
+	if (ref($cur) eq 'HASH') {
+		for my $key (keys %$cur) {
+			# Ignore scalars
+			next unless ref $cur->{$key};
+
+			my $to_remove = isweak $cur->{$key};
+			$to_remove ||= ($key eq "#%#parent");
+			$to_remove ||= ($key eq "#%#root");
+			# Remove weak refs
+			if ($to_remove) {
+				delete $cur->{$key};
+				next;
+			}
+			
+			# Not weak, go down.
+			remove_weak($cur->{$key}) if ref $cur->{$key};
+		}
+	} elsif (ref($cur) eq 'ARRAY') {
+		for (my $i = 0 ; $i < @$cur ; $i++) {
+			# Ignore scalars
+			next unless ref $cur->[$i];
+
+			# Remove weak refs
+			if (isweak $cur->[$i]) {
+				delete $cur->[$i];
+				next;
+			}
+
+			# Not weak, go down.
+			remove_weak($cur->[$i]);
+		}
+	} elsif (ref($cur) eq 'SCALAR') {
+		# Ignore scalars
+		next unless ref $$cur;
+
+		remove_weak($$cur);
+	} else {
+		# This cannot be circular, ignoring
+	}
+}