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 graph('General', 'Memory', { },
  74       [
  75        (map { "DEF:swap_$_=$R/swap/swap-$_.rrd:value:AVERAGE" }
  76             qw(free used cached)),
  77        (map { "DEF:mem_$_=$R/memory/memory-$_.rrd:value:AVERAGE" }
  78             qw(buffered free used cached)),
  79        "CDEF:c_swap_used=0,swap_used,-",
  80        "CDEF:c_swap_cached=0,swap_cached,-",
  81        "CDEF:c_swap_free=0,swap_free,-",
  82        "AREA:c_swap_used#000:used swap",
  83        "AREA:c_swap_cached#888:\"cached\" swap:STACK",
  84 #       "AREA:c_swap_free#88f:free swap:STACK",
  85        "AREA:mem_used#ff0:used memory",
  86        "AREA:mem_buffered#00f:page cache:STACK",
  87        "AREA:mem_cached#008:buffer cache:STACK",
  88        "AREA:mem_free#ccc:unused memory:STACK",
  89        ]);
  90
  91 foreach my $src (<$R/df/df-*.rrd>) {
  92     my $vol= $src;
  93     $vol =~ s,.*/,,;
  94     $vol =~ s,^df-,,;
  95     $vol =~ s,\.rrd$,,;
  96     graph('Disk space', $vol, {
  97              Slower => 1,
  98           },
  99           [ '-A','-l',0,'-r',
 100            qw(-b 1024 -l 0),
 101            (map { "DEF:$_=$src:$_:AVERAGE" } qw(free used)),
 102            "AREA:used#000:used:STACK",
 103            "AREA:free#88f:free:STACK",
 104            ]);
 105 }
 106
 107 if (param('debug')) {
 108     print "Content-Type: text/plain\n\n";
 109 }
 110
 111 our @navsettings;
 112
 113 sub navsetting ($) {
 114     my ($nav) = @_;
 115     my $var= $nav->{Variable};
 116     $$var= param($nav->{Param});
 117     $$var= $nav->{Default} if !defined $$var;
 118     die $nav->{Param} unless grep { $_ eq $$var } @{ $nav->{Values} };
 119     push @navsettings, $nav;
 120 }
 121
 122 our $section;
 123
 124 navsetting({
 125     Desc => 'Section',
 126     Param => 'section',
 127     Variable => \$section,
 128     Default => $sections[0],
 129     Values => [@sections],
 130     Show => sub { return $_[0]; }
 131 });
 132
 133
 134 my $gname= param('graph');
 135
 136 sub num_param ($$$$) {
 137     my ($param,$def,$min,$max) = @_;
 138     my $v= param($param);
 139     return $def if !defined $v;
 140     $v =~ m/^([1-9]\d{0,8})$/ or die;
 141     $v= $1;
 142     die unless $v >= $min && $v <= $max;
 143     return $v + 0;
 144 }
 145
 146 if ($gname) {
 147     my $g= $graphs{$section,$gname};
 148     die unless $g;
 149
 150     my @args= @{ $g->{Args} };
 151
 152     my $width= num_param('w',370,100,1600);
 153     my $height= num_param('h',200,100,1600);
 154
 155     my $end= param('end');
 156     if (defined $end) {
 157         $end =~ m/^(\d+)$/ or die;
 158         unshift @args, qw(--end now --start), "end-${end}s";
 159     }
 160     if (param('debug')) {
 161         print((join "\n",@args),"\n"); exit 0;
 162     }
 163     print "Content-Type: image/png\n\n";
 164
 165     my $title= $gname;
 166     $title .= " $g->{Units}" if $g->{Units};
 167     unshift @args, '-t', $title;
 168
 169     exec (qw(rrdtool graph - -a PNG --full-size-mode),
 170           '-w',$width, '-h',$height,
 171           @args);
 172     die $!;
 173 }
 174
 175 sub start_page ($) {
 176     my ($title) = @_;
 177     print header(), start_html($title);
 178     my $outerdelim= '';
 179     foreach my $nav (@navsettings) {
 180         print $outerdelim;
 181         print $nav->{Desc}, ": ";
 182         my $delim= '';
 183         my $current= $nav->{Variable};  $current= $$current;
 184         foreach my $couldbe (@{ $nav->{Values} }) {
 185             print $delim;
 186             my $show= $nav->{Show}($couldbe);
 187             if ($couldbe eq $current) {
 188                 print "<b>$show</b>";
 189             } else {
 190                 print "<a href=\"$self";
 191                 my $delim2= '?';
 192                 foreach my $nav2 (@navsettings) {
 193                     my $current2= $nav2->{Variable};  $current2= $$current2;
 194                     $current2= $couldbe if $nav2->{Param} eq $nav->{Param};
 195                     next if $current2 eq $nav2->{Default};
 196                     print $delim2, "$nav2->{Param}=$current2";
 197                     $delim2= '&';
 198                 }
 199                 print "\">$show</a>";
 200             }
 201             $delim= ' | ';
 202         }
 203         $outerdelim= "<br>\n";
 204     }
 205     print "\n";
 206
 207     print h1("$title");
 208 }
 209
 210 my $detail= param('detail');
 211 if ($detail) {
 212     my $g= $graphs{$section,$detail};
 213     die unless $g;
 214     start_page("$detail graphs");
 215     foreach my $end (@timeranges[$g->{Slower}..$g->{Slower}+3]) {
 216         my $imgurl= "$self?graph=$detail&section=$section&end=$end";
 217         print "<a href=\"$imgurl&w=780&h=800\"><img src=\"$imgurl\"></a>\n";
 218     }
 219     print end_html();
 220     exit 0;
 221 }
 222
 223 our $sloth;
 224
 225 navsetting({
 226     Desc => 'Time interval',
 227     Param => 'sloth',
 228     Variable => \$sloth,
 229     Default => 1,
 230     Values => [0..2],
 231     Show => sub {
 232         my ($sl) = @_;
 233         return ('Narrower', 'Normal', 'Wider')[$sl];
 234     }
 235 });
 236
 237 if (param('debug')) {
 238     use Data::Dumper;
 239     print Dumper(\%graphs);
 240     exit 0;
 241 }
 242
 243 start_page("$section graphs");
 244
 245 foreach my $gname (@{ $sections{$section} }) {
 246     my $g= $graphs{$section,$gname};
 247     print "<a href=\"$self?detail=$gname&section=$section\">";
 248     my $end= $timeranges[$g->{Slower}+$sloth];
 249     my $imgurl= "$self?graph=$gname&section=$section&end=$end";
 250     print "<img src=\"$imgurl\"></a>\n";
 251 }
 252