I'm having trouble finding out how to find the current PGconn connection inside a C function. Looking through the documentation didn't give this up. Could anyone suggest where to look? I didn't even see anything similar to this in the SPI_* documentation. Perhaps I am totally mislead here?
Why:
I am writing an wrapper around librsync, allowing differential updating of large amounts of data (librsync wraps the clever algorithm of rsync).
The first function I'm wrapping is the one which generates a signature (a hash of each block of data, with some specified block-size) from a LO. Its signature would be:
create function rsync_signature(oid /* of an Large Object */) returns bytea
But I can't figure out how to get the current PGconn to be able to run the lo_* functions.
On another not, would it be possible to avoid using Large Objects, and use TOAST columns instead? Ie. is it possible to quickly read/write partial toast columns (I know it's not possible for clients, but on the server side?).
There may be more questions later, but I'll try to pay back by submitting the final implementation to contrib/ (if anyone is interested). It'll allow for really fast incremental updates of a columns, which I'll use to make storing of huge blobs less of a pain (although it depends on the client also speaking rsync-ese, but that'll be included with the package).
Regards,
d. -- David Helgason Over the Edge Entertainments
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