[dancer-users] From Dancer launch Background Process

30 Apr 2013

      Hello
I would like to launch in background a perl program ( or function who 
create lot of PDF) from my Dancer APP.
and view in web page the log of this program.

I've done a small test, ajax part works well, but if my process 
backgroup is too long with sleep , nothing works, web browser wait...

What is the best way to do that ?

use backtick ``, system, exec ? create sub or launch external perl 
program as

my $output = qx|perl /util/generation.pl $id &|; print $output;

or fork module ?

thanks for your advice
Hugues.

post '/generationpdf' => sub {
...
...
background();

}

#my test background process
sub background {
         open (LOG,">:encoding(UTF-8)",$PATHPDF."generationpdf.log") || 
die ("Problème d'ouverture du fichier de log $!");
         say LOG "\n################################################";
         for (my $i=0;$i<300;$i++) {
                # sleep 1;
                 say LOG $i;
         }

}

AJAX PART

ajax '/getloadavg' => sub {
         my $cmd = "tail ". $PATHPDF. "generationpdf.log";

     {
         timestamp => time,
         loadavg => `$cmd`,
     };

TEMPLATE PART

<pre>Calcul des PDF: <span id="flog"></span> </pre>
<script type="text/javascript">
setInterval(function() {
     $.getJSON('[% request.uri_base %]/getloadavg', function(response) {
         var point = [
             response.timestamp,
             response.log
         ];;
         $("#timestamp").text(response.timestamp);
         $("#flog").text(response.flog);
     })
}, 1000);
</script>

[dancer-users] From Dancer launch Background Process

Hugues Max