Hi,
I''ve been doing some experiments with php and if can use something like
<?php
for ($i = 0; $i < 100; $i++) {
echo "hello world";
flush();
sleep(10);
}
?>
to keep a http link open for an arbitrary amount of time and
routinely display "hello world" in the browser window.
Is is possible to write a mongrel handler to do something similar?
Thanks
jeb
On Fri, 23 Nov 2007 16:26:04 +0000 Jeremy Wilkins <jeremy at ibexinternet.co.uk> wrote:> Hi, > > I''ve been doing some experiments with php and if can use something like > > <?php > > for ($i = 0; $i < 100; $i++) { > echo "hello world"; > flush(); > sleep(10); > } > > ?> > > to keep a http link open for an arbitrary amount of time and > routinely display "hello world" in the browser window. > > Is is possible to write a mongrel handler to do something similar?Yep, you could probably write a handler to do that, but probably not a rails action without tons of surgery. However, this will fall down pretty quick once you hit Ruby''s 1024 (or less) file descriptor limit due to its use of select. Zed
You might find this interesting. http://adam.blogs.bitscribe.net/2007/05/08/comet-with-rails-mongrel/ http://code.google.com/p/rlogwatch/ -Todd On Nov 23, 2007 5:23 PM, Zed A. Shaw <zedshaw at zedshaw.com> wrote:> On Fri, 23 Nov 2007 16:26:04 +0000 > Jeremy Wilkins <jeremy at ibexinternet.co.uk> wrote: > > > Hi, > > > > I''ve been doing some experiments with php and if can use something like > > > > <?php > > > > for ($i = 0; $i < 100; $i++) { > > echo "hello world"; > > flush(); > > sleep(10); > > } > > > > ?> > > > > to keep a http link open for an arbitrary amount of time and > > routinely display "hello world" in the browser window. > > > > Is is possible to write a mongrel handler to do something similar? > > Yep, you could probably write a handler to do that, but probably not a rails action without tons of surgery. > > However, this will fall down pretty quick once you hit Ruby''s 1024 (or less) file descriptor limit due to its use of select. > > Zed > > _______________________________________________ > Mongrel-users mailing list > Mongrel-users at rubyforge.org > http://rubyforge.org/mailman/listinfo/mongrel-users >
Cheers for the reply, the intention was to use a custom handler to bypass rails for just this one action. I''m currently using a poll, and am looking into the possibility of keeping the connection open instead. There will only be a maximum of 15 connections open at any one time - would this still be limited by ruby file descriptor limit? I''ve managed to get mongrel handler almost doing what I want but not quite - I can''t tell mongrel to flush data down the socket at the moment, is there a way to go about this. I''ve had a look at http://adam.blogs.bitscribe.net/2007/05/08/comet-with-rails-mongrel/ but can''t get this approach to work since it seems to depend on a non existant HTTPResponse.flush method. Thanks Jeremy On 23 Nov 2007, at 22:23, Zed A. Shaw wrote:> On Fri, 23 Nov 2007 16:26:04 +0000 > Jeremy Wilkins <jeremy at ibexinternet.co.uk> wrote: > >> Hi, >> >> I''ve been doing some experiments with php and if can use something >> like >> >> <?php >> >> for ($i = 0; $i < 100; $i++) { >> echo "hello world"; >> flush(); >> sleep(10); >> } >> >> ?> >> >> to keep a http link open for an arbitrary amount of time and >> routinely display "hello world" in the browser window. >> >> Is is possible to write a mongrel handler to do something similar? > > Yep, you could probably write a handler to do that, but probably > not a rails action without tons of surgery. > > However, this will fall down pretty quick once you hit Ruby''s 1024 > (or less) file descriptor limit due to its use of select. > > Zed > _______________________________________________ > Mongrel-users mailing list > Mongrel-users at rubyforge.org > http://rubyforge.org/mailman/listinfo/mongrel-users
Try doing the sleep in the `response.start {|head, out| ... }` block,
and call #flush on `out`.
On 11/26/07, Jeremy Wilkins <jeremy at ibexinternet.co.uk>
wrote:> Cheers for the reply, the intention was to use a custom handler to
> bypass rails for just this one action. I''m currently using a poll,
> and am looking into the possibility of keeping the connection open
> instead. There will only be a maximum of 15 connections open at any
> one time - would this still be limited by ruby file descriptor limit?
>
> I''ve managed to get mongrel handler almost doing what I want but
not
> quite - I can''t tell mongrel to flush data down the socket at the
> moment, is there a way to go about this. I''ve had a look at
>
> http://adam.blogs.bitscribe.net/2007/05/08/comet-with-rails-mongrel/
>
> but can''t get this approach to work since it seems to depend on a
non
> existant HTTPResponse.flush method.
>
> Thanks
>
> Jeremy
>
> On 23 Nov 2007, at 22:23, Zed A. Shaw wrote:
>
> > On Fri, 23 Nov 2007 16:26:04 +0000
> > Jeremy Wilkins <jeremy at ibexinternet.co.uk> wrote:
> >
> >> Hi,
> >>
> >> I''ve been doing some experiments with php and if can use
something
> >> like
> >>
> >> <?php
> >>
> >> for ($i = 0; $i < 100; $i++) {
> >> echo "hello world";
> >> flush();
> >> sleep(10);
> >> }
> >>
> >> ?>
> >>
> >> to keep a http link open for an arbitrary amount of time and
> >> routinely display "hello world" in the browser window.
> >>
> >> Is is possible to write a mongrel handler to do something similar?
> >
> > Yep, you could probably write a handler to do that, but probably
> > not a rails action without tons of surgery.
> >
> > However, this will fall down pretty quick once you hit Ruby''s
1024
> > (or less) file descriptor limit due to its use of select.
> >
> > Zed
> > _______________________________________________
> > Mongrel-users mailing list
> > Mongrel-users at rubyforge.org
> > http://rubyforge.org/mailman/listinfo/mongrel-users
>
> _______________________________________________
> Mongrel-users mailing list
> Mongrel-users at rubyforge.org
> http://rubyforge.org/mailman/listinfo/mongrel-users
>
On Mon, 26 Nov 2007 09:30:29 +0000 Jeremy Wilkins <jeremy at ibexinternet.co.uk> wrote:> Cheers for the reply, the intention was to use a custom handler to > bypass rails for just this one action. I''m currently using a poll, > and am looking into the possibility of keeping the connection open > instead. There will only be a maximum of 15 connections open at any > one time - would this still be limited by ruby file descriptor limit?What Eden said, additionally, your sample in the blog post will mostly work, but be careful of threading issues. In Ruby it''s not so bad, but in JRuby you can get hit with weird bugs because they use real threads. For example, double check that the connection object you''re using to query the SQL server doesn''t need a little lock. -- Zed A. Shaw - Hate: http://savingtheinternetwithhate.com/ - Good: http://www.zedshaw.com/ - Evil: http://yearofevil.com/