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_...@$ar", "$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?
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?
Regards,
Andreas
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