As my ACL grows It has crossed my mind that for every acl stanza making
use of a MySQL that fires off, there is the roundtrip cost of the query.
Whilst some of the lookups can be optimised by ACL layout, I'm not going
to be able to avoid some similar very similar queries when I check my
database for certain flags being set on a per user basis.
I spotted that there were a couple of sets of variables available to use
in ACL's. The per session '$acl_c0-9' and (near enough 'per rcpt')
$acl_m0-9
Probably a simple question, but I can't find a relate-able example in
the 'query-style lookups' chunk of my book. Would it be possible for me
to have a single query that returned multiple results and assign each
result to $acl_m0-> so I can look at them elsewhere in the ACL without
the need to make a costly similar query?
For example, I understand how this checks for a recipient:
#************************************************
#CHECK USER IS IN OUR LIST OF VALID RECIPIENTS
#************************************************
drop !recipients = ${lookup mysql{MYSQL_RCPT}}
domains = +hosted_domains
message = No such user
log_message = user $local_part@$domain not defined in database
.. but could I change the query:
MYSQL_RCPT
SELECT email FROM mailusers WHERE email='${quote_mysql:$local_part}@
${quote_mysql:$domain}'
To something like this:
SELECT email,usertype,inbound,outbound FROM mailusers WHERE
email='${quote_mysql:$local_part}@${quote_mysql:$domain}';
and actually access the other items? ($0-> ???). Would this break
anything ? any pitfalls ? even possible ?
Again, my thanks to anyone who has time to cast an eye over it.
