Backend selection based on integer value in request?

[Paul A. Procacci]

You probably want something like the following (untested):

######################################
if(req.url ~ "/\d+\.jpg$"){
  set req.http.X-Image-Int = req.url;
  regsub( req.http.X-Image-Int, "/(\d+)\.jpg$", "\1");
  if(std.integer(req.http.X-Image-Int, 0) > 10) {
    set req.backend = foo;
  }
  elseif(std.integer(req.http.X-Image-Int, 0) > 5) {
    set req.backend = foo2;
  }
  remove req.http.X-Image-Int;
}
######################################

~Paul

On Wed, Oct 10, 2012 at 12:42:22AM +0000, Ross Brown wrote:
> Hi all
>
> We use Varnish for accelerating images. They are uploaded by our users and given a numeric ID, which is allocated sequentially. We have a lot of them.
>
> I'm about to start storing newly-uploaded in a different place, and ideally would like to select a backend by doing a compare against the image ID, eg if the ID > a number, use a different backend. Otherwise the backend will have to check both storage locations to find the image.
>
> I could do this with a regex, but ideally I'd like to do a proper integer comparison. I have read about the integer function in vmod_std, but I don't see how I use that when the integer is part of the request URL.
> https://www.varnish-cache.org/docs/3.0/reference/vmod_std.html?highlight=vmod_std#integer
>
> Request URLs look similar to this: /photoserver/size/1234567.jpg
>
> Any ideas?
>
>
> _______________________________________________
> varnish-misc mailing list
> varnish-misc at varnish-cache.org
> https://www.varnish-cache.org/lists/mailman/listinfo/varnish-misc

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