bug#70645: Reliable HTTPS networking

[Christopher Baines <mail@cbaines.net>]

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Christopher Baines <mail@cbaines.net> writes:

> For years now I've been trying to work out how to do reliable HTTPS
> networking with Guile, where reliable just means that it can't hang
> indefinitely.
>
> After a few wrong turns, I believe the way to do this is use
> non-blocking ports as that combined with suspendable ports in Guile
> allows you to provide current-read-waiter/current-write-waiter
> procedures that will timeout at some point.
>
> I think the final hurdle is to get tls-wrap in (web client) to support
> Asynchronous operation with GnuTLS [1] and I think there are only a
> couple of things missing. make-session needs passing
> connection-flag/nonblock and error/again plus error/interrupted
> exceptions need handling for the handshake using the information from
> record-get-direction about whether Guile should wait to write or read.
>
> 1: https://gnutls.org/manual/html_node/Asynchronous-operation.html
>
> I think I forgot to move things forward after guile-gnutls 4.0.0
> released with record-get-direction, so I'm opening this bug to try and
> keep track of things.

I've now sent a couple of patches.

The first is a re-send of [2], but with some docstring improvements. I
can't find any reference in the Guile docs at least to the bitwise
or'ing of options with the socket style, so while it seems to work, I'm
a bit unsure about that.

2: https://lists.gnu.org/archive/html/guile-devel/2023-07/msg00025.html

The second patch makes the changes inside of tls-wrap.

There's also this patch [3] here to make get-bytevector-all
non-blocking, and that's relevant here as it's used in
read-response-body.

3: https://lists.gnu.org/archive/html/guile-devel/2023-07/msg00023.html

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