[SR-Users] Kamailio 3.2.4 presence

[Vitaliy Aleksandrov]

Readme at the link stated below said that db_mode is a valid parameter.
http://kamailio.org/docs/modules/3.2.x/modules_k/presence.html#id2546358

This patch fixes subscription restoration after kamailio-3.2.4 restart 
in case when db_mode of presence module is 0 (MEMORY_ONLY).

vitalik at work:~/src$ diff modules_k/presence/hash.c modules_k/presence/hash.c
264c264
< if(dbmode == DB_FALLBACK || dbmode == DB_MEMORY_ONLY) {
---
 > if(dbmode == DB_FALLBACK) {

Now it saves subscriptions in memory and periodically(db_update_period 
parameter) dumps them to the active_watchers table.
After restart kamailio fills subscription hash table from the 
active_watchers db table.

Upgrade is a good suggestion as presence module of 3.3.х branch differs 
much from the one in the previous release and I hope it doesn't have 
described problems..
I have to port a few custom modules to switch to the new branch.

> Vitaliy Aleksandrov writes:
>
>> db_mode is 0 (DB_MEMORY_ONLY) and according to comments in the
>> presence.h kamailio holds subscription in memory and periodically
>> updates to db, but retrieves from db only at startup.
>> And it's true, I see that kamailio tries to update the active_watchers
>> table, but it never inserts new subscriptions there.
> i suggest you upgrade to 3.3.  according to its readme, subs_db_mode=0
> means that db is disabled.  perhaps it was the same with 3.2, which
> according to its readme does not have db_mode param.
>
> -- juha
>
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