Retrieving memcache value for further processing

[Mauro Stettler]

you should check the eval module:
http://www.grid.net.ru/nginx/eval.en.html

On Fri, Feb 5, 2010 at 18:56, Markus Jelsma <markus at buyways.nl> wrote:
> Hello list,
>
>
> I need some advice on how to solve my use-case. I have a memcache backend with
> some keys and values. Every HTTP request carries a cookie with a SHA1 hash as
> value, this cookie value is also a key in memcache.
>
> I already can retrieve the value and send it as a HTTP response using the
> following configuration:
>
>      # Check if we got the token, a 160bit SHA1 hash
>      if ($http_cookie ~* "token=([A-Za-z0-9]{40})")
>      {
>        # Attempt to retrieve the token from memcache
>        set $memc_cmd 'get';
>        set $memc_key $http_cookie; # TODO; remove `token=` prefix from key
>
>        memc_pass 127.0.0.1:11211;
>      }
>
> The question is, how to actually retrieve the value in the configuration for
> further processing. For instance, i would like to put the value in the header
> before i proxy it upstream.
>
> I have tried reading the $memc_value but it seems it does not contain the
> result and that it is only being used for setting or appending a key. If i
> proxy_pass to $memc_value after executing memc_pass, it throws an error,
> telling me the $memc_value was still empty.
>
> In the end i need to perform several small operations on some conditions with
> several memcache values before proxying the entire request upstream. Can i
> even do this with the configuration and memc addon? Or would i need some
> inline perl script to do so?
>
> I use the latest 0.7 Nginx and 0.6 Memc addon.
>
>
> Regards,
>
>
> Markus Jelsma - Technisch Architect - Buyways BV
> http://www.linkedin.com/in/markus17
> 050-8536620 / 06-50258350
>
>
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