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auth_request + Multiple set $memcached_key

Posted by adamchal 
auth_request + Multiple set $memcached_key
December 12, 2011 12:01PM
Currently, I'm using auth_request for with memcache to provide super-fast non-blocking authentication. I love it. I noticed, however, I cannot do another memcache query with a different key if the location is being auth_request'd first.

Given the following config for example:

# everything by default must be authenticated
auth_request /_auth;

# authentication
location = /_auth {
auth_request off;
set $memcached_key sso$cookie_uid;
memcached_pass localhost:11211;
error_page 404 =403 /login.html;
default_type application/json;
}

# stats
location = /stats.json {
set $memcached_key mystats;
memc_pass localhost:11211;
default_type application/json;
}


With this configuration, a request to /stats.json will query memcache using the key "sso$cookie_uid" instead of the "mystats" key.

If I turn off auth_request for the /stats.json block, for example:

...
# stats
location = /stats.json {
auth_request off;
set $memcached_key mystats;
memc_pass localhost:11211;
default_type application/json;
}

Then the correct "mystats" key will be used, but then this location is not secure.

I have also tried using Memc add-on and experienced the exact same behavior.

The bottom line is that the "set $memcached_key" is not being evaluated a second time after the auth_request module has performed its part.

Does anyone have an idea of a work-around or thoughts on this approach?

Thanks,

Adam
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