Using slapd-sock in consumer replica

[Michael Smith <mjs@smithbowen.net>]

Hi all. I'm trying to use slapd-sock as a way to 
do some ancillary processing, external to the openLDAP database, 
when entries are updated. Following a suggestion I got on this 
list some weeks back, I wrote a little Python program to 
listen on a Unix socket and do the actual processing; then I 
set up a consumer replica using the socket backend to pass 
updates along to the socket. 

Here's my problem: Whenever I stop and then restart the 
replica server, it re-loads the whole tree from the master. 
I conjecture that this is because it doesn't have a persistent
location to store the contextCSN on shutdown. Am I right so 
far? 

I see from logging what comes across the socket that contextCSN 
gets *set* over the socket when the reload finishes. However, it 
doesn't appear that it is being *requested* (via a search operation) 
across the socket when the consumer replication engine starts up. 
Again, am I correct so far? 

My socket listener could always squirrel away the contextCSN 
and then provide it to the replication engine in response to a 
search, if the search were being requested, but apparently it's 
not. 

Is there any way for either my socket program or something internal 
to the openLDAP server to persist and then provide the contextCSN
on server startup? 

Or have I completely misunderstood how this all works? 

Suggestions for alternative design approaches also welcomed, 
and many thanks as always to the local sages. 

-- 
--

Michael J. Smith
mjs@smithbowen.net

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