Unbreak promotion again.
[remoteglot] / www / analysis.pl
index 46795a9..f650bed 100755 (executable)
@@ -1,8 +1,9 @@
 #! /usr/bin/perl
 use CGI;
-use POSIX;
 use Linux::Inotify2;
 use AnyEvent;
+use IPC::ShareLite;
+use Storable;
 use strict;
 use warnings;
 
@@ -25,6 +26,9 @@ my $wait = AnyEvent->timer (
        cb    => sub { $cv->send; },
 );
 
+my $unique = $cgi->param('unique');
+our $num_viewers = count_viewers($unique);
+
 # Yes, this is reinventing If-Modified-Since, but browsers are so incredibly
 # unpredictable on this, so blargh.
 my $ims = 0;
@@ -43,6 +47,38 @@ if ($time > $ims) {
 $cv->recv;
 output();
 
+sub count_viewers {
+       my $unique = shift;
+       my $time = time;
+       my $share = IPC::ShareLite->new(
+               -key => 'RGLT',
+               -create  => 'yes',
+               -destroy => 'no',
+               -size => 1048576,
+       ) or die "IPC::ShareLite: $!";
+        $share->lock(IPC::ShareLite::LOCK_EX);
+       my $viewers = {};
+       eval {
+               $viewers = Storable::thaw($share->fetch());
+       };
+       $viewers->{$unique} = time;
+
+       # Go through and remove old viewers, and count them at the same time.
+       my $num_viewers = 0;
+       while (my ($key, $value) = each %$viewers) {
+               if ($time - $value > 60) {
+                       delete $viewers->{$key};
+               } else {
+                       ++$num_viewers;
+               }
+       }
+
+        $share->store(Storable::freeze($viewers));
+        $share->unlock();
+
+       return $num_viewers;
+}
+
 sub output {
        open my $fh, "<", $json_filename
                or die "$json_filename: $!";
@@ -56,8 +92,9 @@ sub output {
 
        print CGI->header(-type=>'text/json',
                          -x_remoteglot_last_modified=>$time,
+                         -x_remoteglot_num_viewers=>$num_viewers,
                          -access_control_allow_origin=>'http://analysis.sesse.net',
-                         -access_control_expose_headers=>'X-Remoteglot-Last-Modified',
+                         -access_control_expose_headers=>'X-Remoteglot-Last-Modified, X-Remoteglot-Num-Viewers',
                          -expires=>'now');
        print $data;
 }