[Asterisk-Dev] realtime iax2, non-unique realtime requests

[steve at daviesfam.org]

In realtime_peer in chan_iax2 is the possibility to lookup a peer by 
ipaddr/port.  This becomes "select * from table where ipaddr='a.b.c.d' and 
port = '4569'"

This is used from iax2_getpeername where the peer isn't in memory.

iax2_getpeername is called, for instance, in find_callno.

Now there's no paticular requirement elsewhere that there be only one peer 
registered from a particular ip/port.

I guess its usual, but in my test hookup, I'm registering 1000s of peers
from a single machine.

But: the select is a "big job" when it retrieves 1000s of rows.  I see
that the mysql realtime interface reads all of those 1000s of rows,
creating ast_variables for every colum of every row.  And then
realtime_peer reads through every single one of those 10s of 1000s of
variables to find the peername.

In my situation the peername is going to be a bit meaningless - just one 
of the registered peers from that address.  But I want to at least 
optimize this to just fetch one row.

So: in the general case can I just add a "limit 1" to the generated SQL 
statement in the realtime_func?  (Obviously not in the 
realtime_multi_func).

Thanks,
Steve