Munin contributed plugins

#!/usr/bin/perl -w

#

## Copyright (C) 2009 Gleb Voronich <http://stanly.net.ua/>

##

## This program is free software; you can redistribute it and/or

## modify it under the terms of the GNU General Public License

## as published by the Free Software Foundation; version 2 dated June,

## 1991.

##

## This program is distributed in the hope that it will be useful,

## but WITHOUT ANY WARRANTY; without even the implied warranty of

## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

## GNU General Public License for more details.

##

## You should have received a copy of the GNU General Public License

## along with this program; if not, write to the Free Software

## Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

##

##

## $Log$

##

## Based on Redis module code v0.08 2009/from http://svn.rot13.org/index.cgi/Redis

##

## Installation process:

##

## 1. Download the plugin to your plugins directory (e.g. /usr/share/munin/plugins)

## 2. Create 3 symlinks at the directory that us used by munin for plugins detection (e.g. /etc/munin/plugins): redis_connected_clients, redis_per_sec and and redis_used_memory

## 3. Edit plugin-conf.d/munin-node if it is needed (env.host and  env.port variables are accepted; set env.password for password protected Redis server)

## 4. Restart munin-node service

##

## Magic Markers

#%# family=auto

#%# capabilities=autoconf suggest

use strict;

use IO::Socket::INET;

use Switch;

my $HOST = exists $ENV{'host'} ? $ENV{'host'} : "127.0.0.1";

my $PORT = exists $ENV{'port'} ? $ENV{'port'} : 6379;

my $PASSWORD = exists $ENV{'password'} ? $ENV{'password'} : undef;

my $TITLE_PREFIX = exists $ENV{'title_prefix'} ? $ENV{'title_prefix'} . ": " : "";

my $sock = &get_conn();

my $config = ( defined $ARGV[0] and $ARGV[0] eq "config" );

my $autoconf = ( defined $ARGV[0] and $ARGV[0] eq "autoconf" );

if ( $autoconf ) {

    if ( defined( $sock ) ) {

        print "yes\n";

        exit 0;

    } else {

        print "no (unable to connect to $HOST\[:$PORT\])\n";

        exit 0;

    }

}

my $suggest = ( defined $ARGV[0] and $ARGV[0] eq "suggest" );

if ( $suggest ) {

    if ( defined( $sock ) ) {

        my @plugins = ('connected_clients', 'key_ratio', 'keys_per_sec', 'per_sec', 'used_keys', 'used_memory');

        foreach my $plugin (@plugins) {

            print "$plugin\n";

        }

        exit 0;

    } else {

        print "no (unable to connect to $HOST\[:$PORT\])\n";

        exit 0;

    }

}

my $hash=&get_info();

$0 =~ s/(.+)redis_//g;

switch ($0) {

    case "connected_clients" {

        if ( $config ) {

            my $maxclients= get_config("maxclients")->{"maxclients"};

            print "graph_title ${TITLE_PREFIX}Connected clients\n";

            print "graph_vlabel Connected clients\n";

            print "graph_category redis\n";

            print "graph_args -l 0\n";

            print "connected_clients.line $maxclients:ff0000:Limit\n";

            print "connected_clients.label connected clients\n";

            exit 0;

        }

        print "connected_clients.value " . $hash->{'connected_clients'} . "\n";

    }

    case "keys_per_sec" {

        if ( $config ) {

            print "graph_title ${TITLE_PREFIX}Keys Per Second\n";

            print "graph_vlabel per \${graph_period}\n";

            print "graph_category redis\n";

            print "graph_args -l 0\n";

            print "hits.label hits\n";

            print "hits.type COUNTER\n";

            print "misses.label misses\n";

            print "misses.type COUNTER\n";

            print "expired.label expirations\n";

            print "expired.type COUNTER\n";

            print "evictions.label evictions\n";

            print "evictions.type COUNTER\n";

            exit 0;

        }

        print "hits.value " . $hash->{'keyspace_hits'} . "\n";

        print "misses.value " . $hash->{'keyspace_misses'} . "\n";

        print "expired.value " . $hash->{'expired_keys'} . "\n";

        print "evictions.value " . $hash->{'evicted_keys'} . "\n";

    }

    case "key_ratio" {

        if ( $config ) {

            print "graph_title ${TITLE_PREFIX}Key Hit vs Miss Ratio\n";

            print "graph_vlabel per \${graph_period}\n";

            print "graph_category redis\n";

            print "graph_args -u 100 -l 0 -r --base 1000\n";

            print "hitratio.label hit ratio\n";

            print "hitratio.type GAUGE\n";

            print "hitratio.draw AREA\n";

            print "missratio.label miss ratio\n";

            print "missratio.type GAUGE\n";

            print "missratio.draw STACK\n";

            exit 0;

        }

        my $total = $hash->{'keyspace_hits'} + $hash->{'keyspace_misses'};

        my $hitratio = 0;

        my $missratio = 0;

        if ($total > 0) {

            $hitratio = $hash->{'keyspace_hits'} / $total * 100;

            $missratio = $hash->{'keyspace_misses'} / $total * 100;

        }

        printf("hitratio.value %.2f\n", $hitratio);

        printf("missratio.value %.2f\n", $missratio);

    }

    case "per_sec" {

        if ( $config ) {

            print "graph_title ${TITLE_PREFIX}Per second\n";

            print "graph_vlabel per \${graph_period}\n";

            print "graph_category redis\n";

            print "graph_args -l 0\n";

            print "requests.label requests\n";

            print "requests.type COUNTER\n";

            print "connections.label connections\n";

            print "connections.type COUNTER\n";

            exit 0;

        }

        print "requests.value ". $hash->{'total_commands_processed'} ."\n";

        print "connections.value ". $hash->{'total_connections_received'} ."\n";

    }

    case "used_memory" {

        if ( $config ) {

            my $maxmemory = get_config("maxmemory")->{"maxmemory"};

            print "graph_title ${TITLE_PREFIX}Used memory\n";

            print "graph_vlabel Used memory\n";

            print "graph_category redis\n";

            print "graph_args -l 0 --base 1024\n";

            print "used_memory.line $maxmemory:ff0000:Limit\n";

            print "used_memory.label used memory\n";

            print "used_memory_peak.label used memory in peak\n";

            print "used_memory_rss.label Resident set size memory usage\n";

            exit 0;

        }

        print "used_memory.value ". $hash->{'used_memory'}  ."\n";

        print "used_memory_rss.value ". $hash->{'used_memory_rss'}  ."\n";

        print "used_memory_peak.value ". $hash->{'used_memory_peak'}  ."\n";

    }

    case "used_keys" {

        my $dbs;

        foreach my $key (keys %{$hash}) {

            if ( $key =~ /^db\d+$/ && $hash->{$key} =~ /keys=(\d+),expires=(\d+)/ ) {

                $dbs->{$key} = [ $1, $2 ];

            }

        }

        if ( $config ) {

            print "graph_title ${TITLE_PREFIX}Used keys\n";

            print "graph_vlabel Used keys\n";

            print "graph_category redis\n";

            print "graph_args -l 0\n";

            foreach my $db (keys %{$dbs}) {

                printf "%s_keys.label %s keys\n", $db, $db;

                printf "%s_expires.label %s expires\n", $db, $db;

            }

            exit 0;

        }

        foreach my $db (keys %{$dbs}) {

            printf "%s_keys.value %d\n", $db, $dbs->{$db}[0];

            printf "%s_expires.value %d\n", $db, $dbs->{$db}[1];

        }

    }

}

close ($sock);

sub get_conn {

    my $sock = IO::Socket::INET->new(

        PeerAddr => $HOST,

        PeerPort => $PORT,

        Timeout => 10,

        Proto => 'tcp'

    );

    if ( defined( $PASSWORD )  ) {

        print $sock "AUTH ", $PASSWORD, "\r\n";

        my $result = <$sock> || die "can't read socket: $!";

    }

    return $sock;

}

sub get_info{

    print $sock "INFO\r\n";

    my $result = <$sock> || die "can't read socket: $!";

    my $rep;

    # +2 characters for \r\n at end of the data block

    read($sock, $rep, substr($result,1)+2) || die "can't read from socket: $!";

    my $hash;

    foreach (split(/\r\n/, substr($rep, 0, -2))) {

        my ($key,$val) = split(/:/, $_, 2);

        if (defined($key)) {

            $hash->{$key} = $val;

        }

    }

    return $hash;

}

# This subroutine returns configuration matched to supplied as object

sub get_config{

    print $sock "*3\r\n\$6\r\nCONFIG\r\n\$3\r\nGET\r\n\$".length($_[0])."\r\n".$_[0]."\r\n";

    # Response will look like like

    # *2\r\n$9\r\nmaxmemory\r\n$10\r\n3221225472\r\n

    my $type = <$sock> || die "can't read socket: $!";

    my $conf;

    if( substr($type,0,1) ne "*" ) {

        return $conf;

    }

    my $count=substr($type,1);

    my ( $namesize, $name, $valuesize, $value );

    while ( $count > 1 ){

        $count=$count-2;

        $namesize=<$sock>;

        read($sock, $name, substr($namesize,1)+2) || die "can't read from socket: $!";

        $valuesize=<$sock>;

        read($sock, $value, substr($valuesize,1)+2) || die "can't read from socket: $!";

        $conf->{substr($name, 0, -2)}=substr($value, 0, -2);

    }

    return $conf;

}

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