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       [ '-b',1024,
  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 graph('General', 'Network', { Units => '[/sec; tx +ve; errs x1000]' },
  92       [
  93        (map {
  94            ("DEF:tx_$_=$R/interface/if_$_-eth0.rrd:tx:AVERAGE",
  95             "DEF:rx_$_=$R/interface/if_$_-eth0.rrd:rx:AVERAGE",
  96             "CDEF:mrx_$_=0,rx_$_,-")
  97            } qw(octets packets errors)),
  98        (map {
  99            ("CDEF:${_}_kb=${_}_octets,1024,/",
 100             "CDEF:${_}_errsx=${_}_errors,1000,*")
 101            } qw(mrx tx)),
 102        "AREA:tx_kb#080:kby",
 103        "LINE:tx_packets#0f0:pkts",
 104        "LINE:tx_errsx#000:errs",
 105        "AREA:mrx_kb#008:kby",
 106        "LINE:mrx_packets#00f:pkts",
 107        "LINE:mrx_errsx#444:errs",
 108       ]);
 109
 110 graph('General', 'Users', {  },
 111       [
 112        "DEF:users=$R/users/users.rrd:users:AVERAGE",
 113        "LINE:users#008:users"
 114        ]);
 115
 116 foreach my $src (<$R/df/df-*.rrd>) {
 117     my $vol= $src;
 118     $vol =~ s,.*/,,;
 119     $vol =~ s,^df-,,;
 120     $vol =~ s,\.rrd$,,;
 121     graph('Disk space', $vol, {
 122              Slower => 1,
 123           },
 124           [ '-A','-l',0,'-r',
 125            qw(-b 1024 -l 0),
 126            (map { "DEF:$_=$src:$_:AVERAGE" } qw(free used)),
 127            "AREA:used#000:used:STACK",
 128            "AREA:free#88f:free:STACK",
 129            ]);
 130 }
 131
 132 if (param('debug')) {
 133     print "Content-Type: text/plain\n\n";
 134 }
 135
 136 our @navsettings;
 137
 138 sub navsetting ($) {
 139     my ($nav) = @_;
 140     my $var= $nav->{Variable};
 141     $$var= param($nav->{Param});
 142     $$var= $nav->{Default} if !defined $$var;
 143     die $nav->{Param} unless grep { $_ eq $$var } @{ $nav->{Values} };
 144     push @navsettings, $nav;
 145 }
 146
 147 our $section;
 148
 149 navsetting({
 150     Desc => 'Section',
 151     Param => 'section',
 152     Variable => \$section,
 153     Default => $sections[0],
 154     Values => [@sections],
 155     Show => sub { return $_[0]; }
 156 });
 157
 158
 159 my $gname= param('graph');
 160
 161 sub num_param ($$$$) {
 162     my ($param,$def,$min,$max) = @_;
 163     my $v= param($param);
 164     return $def if !defined $v;
 165     $v =~ m/^([1-9]\d{0,8})$/ or die;
 166     $v= $1;
 167     die unless $v >= $min && $v <= $max;
 168     return $v + 0;
 169 }
 170
 171 if ($gname) {
 172     my $g= $graphs{$section,$gname};
 173     die unless $g;
 174
 175     my @args= @{ $g->{Args} };
 176
 177     my $width= num_param('w',370,100,1600);
 178     my $height= num_param('h',200,100,1600);
 179
 180     my $end= param('end');
 181     if (defined $end) {
 182         $end =~ m/^(\d+)$/ or die;
 183         unshift @args, qw(--end now --start), "end-${end}s";
 184     }
 185     if (param('debug')) {
 186         print((join "\n",@args),"\n"); exit 0;
 187     }
 188     print "Content-Type: image/png\n\n";
 189
 190     my $title= $gname;
 191     $title .= " $g->{Units}" if $g->{Units};
 192     unshift @args, '-t', $title;
 193
 194     exec (qw(rrdtool graph - -a PNG --full-size-mode),
 195           '-w',$width, '-h',$height,
 196           @args);
 197     die $!;
 198 }
 199
 200 sub start_page ($) {
 201     my ($title) = @_;
 202     print header(), start_html($title);
 203     my $outerdelim= '';
 204     foreach my $nav (@navsettings) {
 205         print $outerdelim;
 206         print $nav->{Desc}, ": ";
 207         my $delim= '';
 208         my $current= $nav->{Variable};  $current= $$current;
 209         foreach my $couldbe (@{ $nav->{Values} }) {
 210             print $delim;
 211             my $show= $nav->{Show}($couldbe);
 212             if ($couldbe eq $current) {
 213                 print "<b>$show</b>";
 214             } else {
 215                 print "<a href=\"$self";
 216                 my $delim2= '?';
 217                 foreach my $nav2 (@navsettings) {
 218                     my $current2= $nav2->{Variable};  $current2= $$current2;
 219                     $current2= $couldbe if $nav2->{Param} eq $nav->{Param};
 220                     next if $current2 eq $nav2->{Default};
 221                     print $delim2, "$nav2->{Param}=$current2";
 222                     $delim2= '&';
 223                 }
 224                 print "\">$show</a>";
 225             }
 226             $delim= ' | ';
 227         }
 228         $outerdelim= "<br>\n";
 229     }
 230     print "\n";
 231
 232     print h1("$title");
 233 }
 234
 235 my $detail= param('detail');
 236 if ($detail) {
 237     my $g= $graphs{$section,$detail};
 238     die unless $g;
 239     start_page("$detail graphs");
 240     foreach my $end (@timeranges[$g->{Slower}..$g->{Slower}+3]) {
 241         my $imgurl= "$self?graph=$detail&section=$section&end=$end";
 242         print "<a href=\"$imgurl&w=780&h=800\"><img src=\"$imgurl\"></a>\n";
 243     }
 244     print end_html();
 245     exit 0;
 246 }
 247
 248 our $sloth;
 249
 250 navsetting({
 251     Desc => 'Time interval',
 252     Param => 'sloth',
 253     Variable => \$sloth,
 254     Default => 1,
 255     Values => [0..2],
 256     Show => sub {
 257         my ($sl) = @_;
 258         return ('Narrower', 'Normal', 'Wider')[$sl];
 259     }
 260 });
 261
 262 if (param('debug')) {
 263     use Data::Dumper;
 264     print Dumper(\%graphs);
 265     exit 0;
 266 }
 267
 268 start_page("$section graphs");
 269
 270 foreach my $gname (@{ $sections{$section} }) {
 271     my $g= $graphs{$section,$gname};
 272     print "<a href=\"$self?detail=$gname&section=$section\">";
 273     my $end= $timeranges[$g->{Slower}+$sloth];
 274     my $imgurl= "$self?graph=$gname&section=$section&end=$end";
 275     print "<img src=\"$imgurl\"></a>\n";
 276 }
 277