Author: W B Hacker Date: To: exim users Subject: Re: [exim] dbm/dbmnz 'write' lookup?
Jakob Hirsch wrote: > Quoting W B Hacker:
>
>>> FWIW, there's a configurable lock timeout for sqlite (defaults to 5s),
>>> which should be sufficient as long as you are not excessively
>>> updating/inserting, which is unlikely in an MTA.
>> '...as long as..'
>
Let's stick to the point initially raised.
AS:
'$(lookup{some simple or complex phrase}}'
- can trigger, among other things, a 'read' of a dbm or dbmnz, (or other..)
AND AS:
- specialized tools are provided for each of the many types of lookup (lsearch;,
cdb; dbm; dbmnz; dsearch;.....etc.
What is sought for a lookup 'type' or lookup 'style' equivalent might be of the
form:
'${alter{some simple or complex phrase}}'
WHERE:
'alter' might be either replaced by, or modified with:
'create', 'write', 'append', 'insert', 'reindex' ... or such.
AND/OR the same specialized 'lookup' types we now have for doing *reads* of a
particular storage format might be also be used as selectors of appropriate
style for *writes* to that same format. Given these are not identical, but are
related.
To the extent such a tool used the same db format as Exim itself uses for its
'hints' db, not a great deal of new code should be required for the 'doing' part.
Other formats could be more difficult.
I do not know how easy/hard it would be to provide for the 'invocation' part.
Of equal concern is how one can, with reliable certainty, prevent Exim from
being made to alter files or *db's it should NOT be permitted to alter.
Or at least any more such than it can already with clever transport code...
Happy to entertain a discussion of SQL features off-line - but not in this venue.
