File: munin-node-debug

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munin 2.0.25-1+deb8u3~bpo70+1
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#! /usr/bin/perl
# Munin node that presents as many virtual hosts, plugins & fields 
# as needed to be able to : 
# - emulate a HUGE network to stress the munin-master server
# - serve as a basis for protocol debugging 
#
# Copyright (C) 2010 Steve Schnepp under the GPLv2

use strict;
use warnings;

use IO::Socket;
use IO::Select;
use Getopt::Long;

# No buffering
$| = 1;

my $nb_servers = 3;
my $nb_plugins = 30;
my $fields_per_plugin = 5;
my $starting_port = 24949;
my $spoolfetch;
my $starting_epoch = -3600; # 1 hour from now
my $dump_config;
my $is_debug;
my $help;
my $update_rate = 10;
my $spoolfetch_rate = 5;
my $listen = "localhost";

my $arg_ret = GetOptions(
	"nb-plugins|n=i" => \$nb_plugins,
	"nb-fields|f=i" => \$fields_per_plugin,
	"nb-servers|s=i" => \$nb_servers,
	"update-rate=i" => \$update_rate,

	"startint-port|p=i" => \$starting_port,

	"listen=s" => \$listen,
	
	"update-rate=i" => \$update_rate,
	"spoolfetch" => \$spoolfetch,
	"spoolfetch-rate=i" => \$spoolfetch_rate,
	"starting-epoch=i" => \$starting_epoch,

	"dump|d" => \$dump_config,
	"help|h" => \$help,
	"debug" => \$is_debug,
);

if ($help) {
	print qq{Usage: $0 [options]

Options:
    --help                   View this message.

    -s --nb-servers <int>     Number of servers [3]
    -p --start-port <int>     Starting TCP listening port [24949]

    -n --nb-plugins <int>     Number of plugins per server [30] 
    -f --nb-fields  <int>     Number of fields per plugins [5]
    --update-rate <int>       Update rate of plugins (in seconds) [10]

       --listen    <host>     Which IP to bind [localhost]. 
                              Use '' or '*' to bind to every interface.

    --spoolfetch              Be spoolfetch capable
    --starting-epoch          Starting epoch: no data will available before.
                               Can be relative to now if negative [-3600] 

    -d --dump                 Only dump a generated munin.conf part [no]
       --debug                Print debug informations [no] 

};
	exit 0;
}

# Convert relatives starting_epoch to absolute
$starting_epoch = time + $starting_epoch if ($starting_epoch < 0);

if ($dump_config) {
	for (my $i = 0; $i < $nb_servers; $i++) {
		my $port = $starting_port + $i;
		print "[host$port.debug.lan]\n";
		print "     address 127.0.0.1\n";
		print "     port $port\n";
		print "\n";
	}
	
	# Only dump config
	exit;
}

# start the servers
my @servers;
for (my $i = 0; $i < $nb_servers; $i ++) {
	my $port = $starting_port + $i;
	# LocalAddr == * doesn't work, it has to be empty
	my $localaddr = ($listen eq '*') ? '' : $listen;
	debug("starting server on port $listen:$port");
	my $server = IO::Socket::INET->new(
		"LocalPort" => $port,
		"LocalAddr" => $localaddr,
		"Listen" => 5,
		"ReuseAddr" => 1,
		"Proto" => "tcp",
	) or die($!);

	push @servers, $server;
}

# Ignoring SIG_CHILD
debug("Ignoring SIG_CHILD");
$SIG{CHLD} = 'IGNORE';

my $select = IO::Select->new(@servers);
while (my @ready = $select->can_read()) {
	foreach my $ready_fh (@ready) {
		my $client = $ready_fh->accept();
		if (! fork()) {
			debug("[$$] Serving new client");
			service($client);
			# Exit the child
			debug("[$$] Finished");
			exit;
		}
	}
}

sub service
{
	my $client = shift;
	my $hostname = "host".$client->sockport().".debug.lan";

	print $client "# munin node at $hostname\n";

	while (my $line = <$client>) {
		chomp($line);
		debug("[$$] client of $hostname asked : $line");
		if ($line =~ m/^list /) {
			for (my $i = 0; $i < $nb_plugins; $i ++) {
				print $client "debug_plugin_$i ";
			}
			print $client "\n";
		} elsif ($line =~ m/^cap (\w+)/) {
			my @caps = "multigraph";
			push @caps, "spool" if $spoolfetch;
			print $client "cap @caps\n";
		} elsif ($line =~ m/^config (\w+)/) {
			my $plugin_number = get_plugin_number($1);
			my $plugin_name = "debug_plugin_$plugin_number";
			print $client "graph_title Debug plugin $plugin_number\n";
			print $client "update_rate $update_rate\n";
			for (my $i = 0; $i < $fields_per_plugin; $i ++) {
				print $client "field_". $plugin_number . "_$i.label field $i of plugin $plugin_name on $hostname\n";
				print $client "field_". $plugin_number . "_$i.type GAUGE\n";
			}
			print $client ".\n";
		} elsif ($line =~ m/^fetch (\w+)/) {
			my $plugin_number = get_plugin_number($1);
			for (my $i = 0; $i < $fields_per_plugin; $i ++) {
				my $value = sin( (time / 3600) * $plugin_number + $i);
				print $client "field_". $plugin_number . "_$i.value $value\n";
			}
			print $client ".\n";
		} elsif ($line =~ m/^spoolfetch (\d+)/) {
			my $timestamp = $1;

			# Cannot start before $starting_epoch
			print "asked $timestamp, " if $is_debug;
			$timestamp = ($timestamp < $starting_epoch) ? $starting_epoch : $timestamp;
			print "starting at $starting_epoch, using $timestamp, \n" if $is_debug;

			# Only send something every $spoolfetch_rate * $update_rate
			if ( $timestamp > time - $spoolfetch_rate * $update_rate) {
				print $client ".\n";
				return;
			}

			# Sends spools strictly > LastSpooled
			for (my $epoch = ($timestamp - $timestamp % $update_rate + $update_rate);
				$epoch < time; $epoch += $update_rate) { 
			for (my $plugin_number = 0; $plugin_number < $nb_plugins; $plugin_number ++) {
				my $plugin_name = "debug_plugin_$plugin_number";
				print $client "multigraph $plugin_name\n";
				print $client "graph_title Debug plugin $plugin_number\n";
				print $client "update_rate $update_rate\n";
				for (my $i = 0; $i < $fields_per_plugin; $i ++) {
					print $client "field_". $plugin_number . "_$i.label field $i of plugin $plugin_name on $hostname\n";
					print $client "field_".$plugin_number."_$i.type GAUGE\n";

					my $value = sin( ($epoch / 3600) * $plugin_number + $i);
					print $client "field_".$plugin_number."_$i.value $epoch:$value\n";
				}
			}
		}
			print $client ".\n";
		} elsif ($line =~ m/^quit/) {
			return;
		} else {
			print $client "# Command not found\n";
		}
	}
}

sub get_plugin_number 
{
	my $plugin_name = shift;
	my $plugin_number = $1 if ($plugin_name =~ m/(\d+)/);
	return $plugin_number;
}

sub debug 
{
	print join(" ", @_) . "\n" if $is_debug; 
}

__END__