#!/usr/bin/perl
#%# family=auto
#%# capabilities=autoconf

use strict;

use LWP;
use JSON;

###
# Infos about HTTP keepalive:
#   hits count:    Requests that get handled via a "keep-alive" enabled connection.
#   live count:    The number of live keep-alive connections.
#   refuses count: the number of times keep-alive mode was refused.
#   timeouts cout: Connections that weren't closed to signal completion according to HTTP1.0/1.1 but simply timed out. 
###

if ( $ARGV[0] and $ARGV[0] eq "autoconf")
{
    print "yes\n";
    exit 0;
}

if ( $ARGV[0] and $ARGV[0] eq "config") {
	print "graph_title Rate Limiter\n";
	print "graph_category Open Xchange\n";
	print "graph_vlabel Number\n";
	print "a.label Requests per minute\n";
	print "a.draw LINE1\n";
	print "b.label Client slot count\n";
	print "b.draw LINE1\n";
	exit 0;    
}

my $url = $ENV{oxJolokiaUrl};
my $username = $ENV{oxJolokiaUser};
my $password = $ENV{oxJolokiaPassword};

callUrl("a","/read/com.openexchange.monitoring:name=RateLimiterMonitor/ProcessedRequestsPerMinute");
callUrl("b","/read/com.openexchange.monitoring:name=RateLimiterMonitor/SlotCount");

sub callUrl {
	my $ua = LWP::UserAgent->new();
	my $req = HTTP::Request->new(GET => "$url$_[1]");
	$req->authorization_basic($username,$password);
	
	$req->header('Accept', => 'text/html');
	
	my $response = $ua->request($req);
	
	if ($response->is_success) {
		my $json = decode_json($response->decoded_content);
		if (defined $json->{value}){
			print "$_[0].value ";
			print $json->{value},"\n";
		}
	}
	else {
		my $status = $response->status_line;
		if ($status == 404) {
			die "Link to servlet might not be set correctly, this can be done by altering /etc/munin/plugin-conf.d/ox and setting the correct path to your jolokia servlet";
		}
		elsif ($status == 401) {
			die "Credentials to login might be not set correctly. The credentials are set inside /opt/open-xchange/etc/jolokia.properties on the OX, for munin, those need to be altered at /etc/munin/plugin-conf.d/ox";
		}
		else {
			die "Something went wrong:\n",$status;
		}
	}
}