Re: How do you deal with lengthy server tasks?

[Dan Winship <danw gnome org>]

On 2/8/19 6:35 AM, Biz.122 via libsoup-list wrote:
> Ok,
>
> So far I got it working. I am doing it asynchronously, which seems to be working pretty well.
>
> Since I am carrying my SoupMessage with me from the server callback (whether it is to a thread or an 
> asynchronous cb), occasionally I will get: soup_server_unpause_message: assertion 'SOUP_IS_MESSAGE (msg)' 
> failed. Gdb may step in and halt the execution; which is completely understandable.
>
> Because I am out of the server-callback I currently don't know if the SoupMessage is still 'valid'.
> How can I determine that the SoupMessage is still in the game?

You need to g_object_ref() the message before returning from the server
callback, and then g_object_unref() it when you are done with it.

-- Dan

> Best regards,
> Biz
>
>
>
>
> Sent with ProtonMail Secure Email.
>
> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> On Tuesday, February 5, 2019 4:24 PM, Guillaume Poirier-Morency via libsoup-list <libsoup-list gnome org> 
> wrote:
>
> > Le dimanche 03 février 2019 à 18:26 +0000, Biz.122 via libsoup-list a
> > écrit :
> >
> > > Hey,
> > > I would like to stream some audio with soup server. How would you go
> > > about something like that? Each browser request will launch the
> > > server callback that does all processing, but I cannot stay in there
> > > looping and sending data. This will block any other requests.
> > > I looked around a bit and found this:
> > > https://github.com/GNOME/libsoup/blob/54014b2d8a7b579b832372cb4dd22df04fefd45e/tests/context-test.c#L41
> > > Look at the "SlowData / soup_add_timeout" example.
> > > Is this how you would typically perform streaming tasks or large file
> > > transfers, and not completely locking up your server callback?
> >
> > You can pause the message with soup_server_pause_message, launch the
> > task in background and resume it later with
> > soup_server_unpause_message.
> >
> > To send data continuously, you can mix that with a chunked response.
> >
> > soup_message_headers_set_encoding (msg, SOUP_ENCODING_CHUNKED);
> > soup_server_pause_message (msg);
> > g_thread_pool_push (pool, msg, NULL);
> >
> > In the thread pool (or asynchronously via the GMainLoop):
> >
> > soup_message_body_append_take (data, data_len);
> > soup_server_unpause_message (msg); // deliver the chunk
> >
> > // later when done
> > soup_message_complete (msg);
> > soup_server_unpause_message (msg);
> >
> > > Best Regards,
> > > Biz
> > > Sent with ProtonMail Secure Email.
> > >
> > > libsoup-list mailing list
> > > libsoup-list gnome org
> > > https://mail.gnome.org/mailman/listinfo/libsoup-list
> >
> > --
> > Guillaume Poirier-Morency guillaumepoiriermorency gmail com
> >
> > Étudiant à la maîtrise en informatique à l'Université de Montréal
> > Chercheur à l'IRIC
> >
> > Mon blog: https://arteymix.github.io/
> > Clé PGP: B1AD6EA5
> >
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