[OpenSIPS-Users] Timeout value for cache_store function and timeout refreshing

[Anca Vamanu]

Hi Andreas,

Andreas Westermaier wrote:
> Hi,
>
> I'm currently using 'cache_store()' to store channel limits for customers in memory to avoid the need of especially fetching it (either from radius, or from db).
>
> Channel limit information comes in via SIP-AVP from radius on each register ('radius_www_authorize()') and on each invite ('radius_proxy_authorize()').
>
> So after a successfull 'radius_proxy_authorize()' I currently do
>
> if (is_avp_set("$avp(s:chanlimit)/n") && avp_check("$avp(s:chanlimit)", "gt/i:0")) {
> 	cache_store("local", "chanlimit_$au@$ar", "$avp(s:chanlimit)", 86400);
> }
>
> This stores the information for a whole day. But I think this could be tweaked if it would be possible to set the timeout for cache expiry to the value of the registration expiry. E.g. by using "$(hdr(Expires){s.int})" as the last parameter for 'cache_store()'.
>
> Q1: Is there a reason why the function currently does not support the variable "$(hdr(Expires){s.int})" for the timeout value or is it just not yet implemented?
>
>   
No, there is no reason not to support variable for expires argument and 
it is a good idea to have it. I will implement it after the release.
> Allowing variables for timeout, the channel limit information would be available as long as the registration for a user will be valid and expires when the registration does. Of course, on each renewal of the registration also the memcache variable has to be refreshed.
>
> Q2: Can the timeout for a memcache variable currently refreshed just by calling 'cache_store()' a second time, after the first execution and before expiration or is it necessary to firstly remove the variable from cache and insert it again for the timer to get reset?
>
>   
Yes, you can refresh the expires by calling cache_store again. The 
implementation is such that a store for the same label rewrites the old 
value.

regards,
Anca
> Regards,
> Andreas
>
>
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