Hi Franz, it could be a litle late but as an example of a very simple
example that I think should be very portable (at the expense of something
more efficent, like using message queues for instance), if your external
background process could report its advance atomically to a file like this
bash script for example:
#!/bin/bash
echo '...Starting background job' > status.data
sleep 5
echo '5 seconds gone...' > status.data
sleep 2
echo 'still working' > status.data
sleep 3
echo 'and finally...' > status.data
sleep 1
echo 'Finished' > status.data
you should be able to consume this information from your mojolicious
applications just using a websocket and a recurring timer, like this for
example:
use Mojolicious::Lite;
use Mojo::File;
use Mojo::IOLoop;
my $path = Mojo::File->new('status.data');
websocket '/status' => sub {
my $c = shift;
my $id = Mojo::IOLoop->recurring(
1 => sub {
my $status = 'Script never run';
$status = $path->slurp if -f "$path";
$c->send({json => {msg => $status}})
}
);
$c->on(finish => sub { Mojo::IOLoop->remove($id) });
};
get '/' => 'index';
app->start;
__DATA__
@@ index.html.ep
<!DOCTYPE html>
<html>
<head>
<title>Echo</title>
<script>
var ws = new WebSocket('<%= url_for('status')->to_abs %>');
ws.onmessage = function (event) {
document.body.innerHTML = JSON.parse(event.data).msg;
};
</script>
</head>
<body> This should disappear in a while </body>
</html>
please let me know if something like this was what you were looking for
BR,
Daniel
El jueves, 30 de junio de 2011, 7:49:32 (UTC-3), dotless-vienna escribió:
>
> I don't insist on using threads, I just want to have some background
> worker that doesn't block my mojolicious server and reports its progress.
>
> I'd really appreciate a short code sample that demonstrates the launch of
> that background worker and mojolicious instance within one perl script.
>
> - Franz
>
> 2011/6/30 Sebastian Riedel <[email protected] <javascript:>>
>
>> For a general purpose solution i would not suggest it (way too
>> expensive), but in this specific case it could work.
>>
>> --
>> Sebastian Riedel
>> http://mojolicio.us
>> http://twitter.com/kraih
>> http://blog.kraih.com
>>
>>
>> Am Donnerstag, 30. Juni 2011 um 10:21 schrieb David Davis:
>>
>> > You can use Mojo::UserAgent in your subprocess to contact your parent
>> process. You could even use websocket...
>> >
>> > David Davis
>> > ☄ Software Engineer
>> > http://xant.us/
>> > http://xantus.tel/
>> >
>> >
>> > On Thu, Jun 30, 2011 at 00:46, Sebastian Riedel <[email protected]
>> <javascript:> (mailto:[email protected] <javascript:>)> wrote:
>> > > Ultra portable makes it tricky, Perl has no real threads and two way
>> communication between forked processes in a portable way is almost
>> impossible without external help.
>> > >
>> > > --
>> > > Sebastian Riedel
>> > > http://mojolicio.us
>> > > http://twitter.com/kraih
>> > > http://blog.kraih.com
>> > >
>> > >
>> > > Am Donnerstag, 30. Juni 2011 um 09:39 schrieb dotless-vienna:
>> > >
>> > > > Hi,
>> > > >
>> > > > In my desktop web app, the user should be able to trigger a long
>> > > > running directory indexing task in the browser with subsequent
>> > > > progress information (e.g. "Indexing file xy") delivered via AJAX.
>> > > >
>> > > > In short, I want to have something like
>> http://webpy.org/cookbook/background.
>> > > >
>> > > > How can I achieve this in Mojolicious? (I don't want to use external
>> > > > messaging services like RabbitMQ, since this should be an ultra-
>> > > > portable web app)
>> > > >
>> > > > Franz
>> > > >
>> > > > --
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