Hashing on a particular cookie value

[Paul A. Procacci]

On Wed, Nov 07, 2012 at 10:18:45PM +0530, Soumendu Bhattacharya wrote:
>    Hi All,
>
>                   I am trying to hash varnish on a particular cookie
>    value. My url remains the same , but  the content changes depending on
>    if you have this particular cookie and its value. I am stuck at how to
>    evaluate that cookie value and pass it to hash function (passing it to
>    hash function is not a problem - but how to evaluate the cookie value).
>
>
>    Can this be done in default Varnish ?
>
>    Any help will be greatly appreciated.

The following (untested) snippet might be what you are looking for?

##############################
sub vcl_hash {
  hash_data(req.url);
  if (req.http.host) {
    hash_data(req.http.host);
  } else {
    hash_data(server.ip);
  }

  if (req.http.cookie ~ "mycookie=") {
    set req.http.X-TMP = regsub(req.http.cookie, ".*mycookie=([^;]+);.*", "\1");
    hash_data(req.http.X-TMP);
    remove req.http.X-TMP;
  }
  return (hash);
}
##############################

The `req` object is available for you to mess with in vcl_hash.

~Paul

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