Re: [PATCH v12] GSSAPI encryption support

Hello friends,

Here's v12, both here and on my github:
https://github.com/frozencemetery/postgres/tree/feature/gssencrypt12

What changed:

- The code is aware of memory contexts now. I actually really like the
memory context stuff; just didn't see any indication of its existence
in the code I had read. Anyway, we allocate server buffers in the
connection-lifetime context. The other alternative that we discussed
on IRC a bit was to avoid palloc()/pfree() entirely in favor of raw
calloc()/free(), but I think if possible I prefer this approach since
I find the StringInfo handy to work with. This eliminates the
traceback for me with --enable-cassert.

- Error cleanup. I've been looking very hard at this code in order to
try to fix the assert, and I've fixed up a couple error paths that
hadn't been taken. This involves replacing the double-send with a
buffer-and-then-send, which turns out to be not only shorter but
easier for me to reason about.

Thanks!