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Re: Parallel subrequests for multi-source long polling?

agentzh
November 18, 2009 11:30PM
On Wed, Nov 18, 2009 at 4:24 PM, agentzh <agentzh@gmail.com> wrote:
> 4. In your output filter, first check if there's a ctx object
> associated with the current request. If yes, then you're filtering one
> of the subrequests that your content handler starts. So now simply
> buffer the response chain link in this ctx object (in meomory or on
> disk, it's up to you).

We should also abort the current (sub)request if the ctx shows
"success", which means another brother subrequest has succeeded
already ;)

> If the "failures" counter reaches the total number of the subrequests
> (which means all tests are failed), then returns the final failure
> (and set the main request's status code if appropriate and send
> headers for the main request.)
>
> Your main request, i.e., the content handler should not send headers
> or any contents by itself and should return NGX_DONE.
>

I was a bit hand-waving here. To be more accurate:

In the "post_subrequest" handler, sends headers and contents directly
on "r->parent" rather than "r" because the latter references the
current subrequest while the former is our "main request". Also never
forget to call ngx_http_finalize_request on "r->parent", or you'll
observe that "mysterious hang" for nginx 0.8.21+ mentioned in one of
my earlier replies ;)

> I think this model should work after my various experiments in the
> "echo" module, but I could be wrong ;) Feel free to tell us your
> findings on your way :)
>

Now I believe it should work ;)

Thanks for making me thinking about this issue very hard again :)

Best,
-agentzh
Subject Author Posted

Parallel subrequests for multi-source long polling?

shaun November 18, 2009 01:30AM

Re: Parallel subrequests for multi-source long polling?

Piotr Sikora November 18, 2009 02:28AM

Re: Parallel subrequests for multi-source long polling?

agentzh November 18, 2009 03:28AM

Re: Parallel subrequests for multi-source long polling?

agentzh November 18, 2009 03:30AM

Re: Parallel subrequests for multi-source long polling?

shaun November 18, 2009 04:22AM

Re: Parallel subrequests for multi-source long polling?

agentzh November 18, 2009 11:30PM

Re: Parallel subrequests for multi-source long polling?

shaun November 19, 2009 03:54AM

Re: Parallel subrequests for multi-source long polling?

agentzh November 19, 2009 04:58AM

Re: Parallel subrequests for multi-source long polling?

agentzh November 19, 2009 06:32AM

Re: Parallel subrequests for multi-source long polling?

shaun November 19, 2009 02:20PM

Re: Parallel subrequests for multi-source long polling?

Piotr Sikora November 19, 2009 03:28PM

Re: Parallel subrequests for multi-source long polling?

shaun November 19, 2009 04:08PM

Re: Parallel subrequests for multi-source long polling?

Piotr Sikora November 19, 2009 05:42PM

Re: Parallel subrequests for multi-source long polling?

shaun November 20, 2009 03:33AM

Re: Parallel subrequests for multi-source long polling?

Piotr Sikora November 20, 2009 04:48AM

Re: Parallel subrequests for multi-source long polling?

agentzh November 20, 2009 05:28AM

Re: Parallel subrequests for multi-source long polling?

shaun November 20, 2009 06:41AM

Re: Parallel subrequests for multi-source long polling?

shaun November 21, 2009 09:12PM

Re: Parallel subrequests for multi-source long polling?

Piotr Sikora November 21, 2009 10:10PM



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