cgi

   1 #!/usr/bin/perl -w
   2
   3 use strict qw(vars);
   4 use CGI qw/:standard/;
   5
   6 sub fail ($) {
   7     print(header(-status=>500),
   8           start_html('Error'),
   9           h1('Error'),
  10           escapeHTML($_[0]),
  11           end_html());
  12     exit 0;
  13 }
  14
  15 our $R= '/var/lib/collectd/rrd/chiark.greenend.org.uk';
  16
  17 my $self= url(-relative=>1);
  18
  19 our (@sections, %sections, %graphs);
  20
  21 our @timeranges= (3600, map { $_*86400 } qw(1 7 28), 13*7+1);
  22
  23 sub graph ($$$$) {
  24     my ($section, $gname, $basis, $args) = @_;
  25     $basis->{Args}= $args;
  26     $basis->{Slower}= 0 unless exists $basis->{Slower};
  27     $graphs{$section,$gname}= $basis;
  28     if (!exists $sections{$section}) {
  29         push @sections, $section;
  30     }
  31     push @{ $sections{$section} }, $gname;
  32 }
  33
  34 graph('General', 'Load', { },
  35       [
  36        "DEF:load=$R/load/load.rrd:shortterm:AVERAGE",
  37        (map { "DEF:$_=$R/processes/ps_state-$_.rrd:value:AVERAGE" }
  38             qw(blocked running stopped paging sleeping zombies)),
  39        "AREA:running#88f:running processes:STACK",
  40        "AREA:blocked#8f8:blocked processes:STACK",
  41        "AREA:paging#f88:paging processes:STACK",
  42        "LINE:load#000:load",
  43        ]);
  44
  45 graph('General', 'Processes', { },
  46       [
  47        (map { "DEF:$_=$R/processes/ps_state-$_.rrd:value:AVERAGE" }
  48             qw(blocked running stopped paging sleeping zombies)),
  49        "CDEF:busy=0".(join '', map { ",$_,+" } qw(running blocked paging)),
  50        "AREA:sleeping#ccc:sleeping:STACK",
  51        "AREA:stopped#f00:stopped:STACK",
  52        "AREA:zombies#0f0:zombie:STACK",
  53        "AREA:busy#f00:busy:STACK",
  54        ]);
  55
  56 graph('General', 'CPU', { Units => '[%]' },
  57       [
  58        (map {
  59            my $thing= $_;
  60            (map { "DEF:$thing$_=$R/cpu-$_/cpu-$thing.rrd:value:AVERAGE" }
  61                 (0..7)),
  62            "CDEF:$thing=0".join('', map { ",$thing$_,+" } (0..7)).",8.0,/";
  63        } qw(idle interrupt nice softirq steal system user wait)),
  64        "AREA:system#00f:system:STACK",
  65        "AREA:wait#f88:wait:STACK",
  66        "AREA:nice#ccc:nice:STACK",
  67        "AREA:user#080:user:STACK",
  68        "AREA:softirq#f0f:softirq:STACK",
  69        "AREA:interrupt#ff0:interrupt:STACK",
  70        "AREA:steal#0ff:steal:STACK",
  71        ]);
  72
  73 foreach my $src (<$R/df/df-*.rrd>) {
  74     my $vol= $src;
  75     $vol =~ s,.*/,,;
  76     $vol =~ s,^df-,,;
  77     $vol =~ s,\.rrd$,,;
  78     graph('Disk space', $vol, {
  79              Slower => 1,
  80           },
  81           [
  82            qw(-b 1024 -l 0),
  83            (map { "DEF:$_=$src:$_:AVERAGE" } qw(free used)),
  84            "AREA:used#000:used:STACK",
  85            "AREA:free#88f:free:STACK",
  86            ]);
  87 }
  88
  89 if (param('debug')) {
  90     print "Content-Type: text/plain\n\n";
  91 }
  92
  93 my $gname= param('graph');
  94 my $section= param('section');
  95 $section ||= $sections[0];
  96 die unless $sections{$section};
  97
  98 if ($gname) {
  99     my $g= $graphs{$section,$gname};
 100     die unless $g;
 101
 102     my @args= @{ $g->{Args} };
 103
 104     my $end= param('end');
 105     if (defined $end) {
 106         $end =~ m/^(\d+)$/ or die;
 107         unshift @args, qw(--end now --start), "end-${end}s";
 108     }
 109     if (param('debug')) {
 110         print((join "\n",@args),"\n"); exit 0;
 111     }
 112     print "Content-Type: image/png\n\n";
 113
 114     my $title= $gname;
 115     $title .= " $g->{Units}" if $g->{Units};
 116     unshift @args, '-t', $title;
 117
 118     exec qw(rrdtool graph - -a PNG --full-size-mode -w 370 -h 200), @args;
 119     die $!;
 120 }
 121
 122 sub start_page ($) {
 123     my ($title) = @_;
 124     print header(), start_html($title);
 125     my $delim= '';
 126     foreach my $s2 (@sections) {
 127         print $delim;
 128         if ($s2 eq $section) {
 129             print "<b>$section</b>";
 130         } else {
 131             print "<a href=\"$self";
 132             if ($s2 ne $sections[0]) { print "?section=$s2"; }
 133             print "\">$s2</a>";
 134         }
 135         $delim= ' | ';
 136     }
 137     print h1("$title");
 138 }
 139
 140 my $detail= param('detail');
 141 if ($detail) {
 142     my $g= $graphs{$section,$detail};
 143     die unless $g;
 144     start_page("$detail graphs");
 145     foreach my $end (@timeranges[$g->{Slower}..$g->{Slower}+3]) {
 146         print "<img src=\"$self?graph=$detail&section=$section&end=$end\">\n";
 147     }
 148     print end_html();
 149     exit 0;
 150 }
 151
 152 if (param('debug')) {
 153     use Data::Dumper;
 154     print Dumper(\%graphs);
 155     exit 0;
 156 }
 157
 158 start_page("$section graphs");
 159
 160 foreach my $gname (@{ $sections{$section} }) {
 161     my $g= $graphs{$section,$gname};
 162     print "<a href=\"$self?detail=$gname&section=$section\">";
 163     my $end= $timeranges[$g->{Slower}+1];
 164     my $imgurl= "$self?graph=$gname&section=$section&end=$end";
 165     print "<img src=\"$imgurl\"></a>\n";
 166 }
 167