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Re: Parallel subrequests for multi-source long polling?

Piotr Sikora
November 19, 2009 03:28PM
> So, as another option, I wonder if it's possible to do this using
> completely separate requests. I have no idea about the feasibility of
> this, but it seems like it could work. I could create new requests where
> I was using subrequests before and then configure the upstream manually,
> attach a context and then collate the results in the output filter.
> Everything would work nearly the same except the finalizing of the main
> request would have to happen in the child request filter instead of the
> subrequest's postreq handler.
>
> I'll take a stab at hacking the postpone chains and if that doesn't seem
> safe or sane, I'll give the second option a try.

If you want to go that route then I believe that you could re-use a lot of
code from ngx_supervisord[1]. Most of the code below line 993 ("nginx <>
supervisord communication" comment) does exacly what you need (creating
"fake request", connecting to upstream outside of "upstream {}" confing,
etc).

One thing you should know upfront is that I needed requests which would be
totally independent from any real connections / requests (ngx_supervisord
communicates with supervisord even when there are no requests - to shut down
idle backends, for example), and that's why there is a lot of code to create
"fake" connections, events and configs in ngx_supervisord_init. I'm pretty
sure you could get away with pointing most of them to data from original
request...

Also, responses from supervisord are quite small, so I'm forcing nginx to
read them into memory. You might need to use temp files for bigger things.

[1] http://labs.frickle.com/nginx_ngx_supervisord/

Best regards,
Piotr Sikora < piotr.sikora@frickle.com >
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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