Just to let everyone know how I've sorted my problem. Firstly i've added
one_time to the router, but I've also changed my psql select function to
avoid a race condition and also ensure a consistant select.
my router has the line
data = ${lookup pgsql{select * from mailing_list_send('${quote_pgsql:
$local_part}','${quote_pgsql:$sender_address}','${quote_pgsql:
$h_subject:}','${quote_pgsql:$message_id}')}}
and in postgresql I have the following function.
create or replace function mailing_list_send(list text, sender text, subject
text, messageId text) returns setof varchar as $$
DECLARE
recordCount int4;
BEGIN
select into recordCount count(ml_id) from mailing_list_log where ml_id =
messageId;
IF ( recordCount = 0) THEN
insert into mailing_list_log (ml_name, ml_recipient, ml_sender,
ml_subject, ml_id)
select list, ml_recipient, sender, subject, messageId from
mailing_list_recipients
where ml_name = list and ml_disabled is null;
END IF;
return query select ml_recipient from mailing_list_log
where ml_id = messageId;
return;
END;
$$
LANGUAGE plpgsql;
I've also added the 'one_time' statement to the router. I know it's belts and
braces but it seems to do the job.
--
Gary Stainburn
Group I.T. Manager
Ringways Garages
http://www.ringways.co.uk
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