#!/usr/bin/perl
# -*- perl -*-

=head1 NAME

tomcat_access - Plugin to monitor the number of accesses to Tomcat
servers.

=head1 CONFIGURATION

The following environment variables are used by this plugin

 timeout  - Connection timeout
 url      - Override default status-url
 ports    - HTTP port numbers
 pname	  - Nome of the connector
 user     - Manager username
 password - Manager password

=head1 USAGE

Requirements:

Needs access to
http://<user>:<password>@localhost:8080/manager/status?XML=true (or
modify the address for another host).

Tomcat 5.0 or higher.

A munin-user in $CATALINA_HOME/conf/tomcat-users.xml should be set up
for this to work.

Tip: To see if it's already set up correctly, just run this plugin
with the parameter "autoconf". If you get a "yes", everything should
work like a charm already.

tomcat-users.xml example:
 <user username="munin" password="<set this>" roles="standard,manager"/>

=head1 AUTHOR

Ricardo Fraile <rikr_@hotmail.com>
Rune Nordbøe Skillingstad <runesk@linpro.no>

=head1 LICENSE

GPL 2.

=head1 MAGIC MARKERS

 #%# family=manual
 #%# capabilities=autoconf

=cut

use strict;

my $ret = undef;

if(!eval "require LWP::UserAgent;") {
    $ret = "LWP::UserAgent not found";
}

if(!eval "require XML::Simple;") {
    $ret .= "XML::Simple not found";
} 

my $URL      = exists $ENV{'url'}      ? $ENV{'url'}      : "http://%s:%s\@127.0.0.1:%d/manager/status?XML=true";
my $PORT     = exists $ENV{'ports'}    ? $ENV{'ports'}    : 8080;
my $PNAME    = exists $ENV{'pname'}    ? $ENV{'pname'}    : "http-8080";
my $USER     = exists $ENV{'user'}     ? $ENV{'user'}     : "munin";
my $PASSWORD = exists $ENV{'password'} ? $ENV{'password'} : "munin";
my $TIMEOUT  = exists $ENV{'timeout'}  ? $ENV{'timeout'}  : 30;

my $url = sprintf $URL, $USER, $PASSWORD, $PORT;

if(exists $ARGV[0] and $ARGV[0] eq "autoconf") {
    if($ret) {
	print "no ($ret)\n";
	exit 0;
    }
    my $au = LWP::UserAgent->new(timeout => $TIMEOUT);
    my $repsonse = $au->request(HTTP::Request->new('GET',$url));
    if($repsonse->is_success and $repsonse->content =~ /<status>.*<\/status>/im) {
	print "yes\n";
	exit 0;
    } else {
	print "no (no tomcat status)\n";
	exit 0;
    }
}

if(exists $ARGV[0] and $ARGV[0] eq "config") {
    print "graph_title Tomcat accesses\n";
    print "graph_args --base 1000\n";
    print "graph_vlabel accesses / \${graph_period}\n";
    print "graph_category tomcat\n";
    print "accesses.label Accesses\n";
    print "accesses.type DERIVE\n";
    print "accesses.max 1000000\n";
    print "accesses.min 0\n";
    exit 0;
}

my $ua = LWP::UserAgent->new(timeout => $TIMEOUT);
my $xs = new XML::Simple;
my $response = $ua->request(HTTP::Request->new('GET',$url));
my %options = ( KeyAttr => { connector => 'name' }, ForceArray => 1 );
my $xml = $xs->XMLin($response->content, %options);

if($xml->{'connector'}->{"\"".$PNAME."\""}->{'requestInfo'}->[0]->{'requestCount'}) {
    print "accesses.value " . $xml->{'connector'}->{"\"".$PNAME."\""}->{'requestInfo'}->[0]->{'requestCount'} . "\n";
} else {
    print "accesses.value U\n";
}

# vim:syntax=perl