bo access from VFP

[Guillaume Quintard]

Happy holidays to everyone,

Unless I'm mistaken, there's no way for a VFP to access the busyobj, and
was wondering if that could change as I need it to retrieve a vmod_priv.

For some context, I stumbled on this while working on this vmod:
https://github.com/gquintard/vmod_rers/tree/v0.0.2
(It's in rust, and I'm using it to explore what kind of bindings we need. I
already have a couple of examples for VDP[1] and VFP[2] in the crate[3]
repo, but of course they don't need as much as a real vmod.)

With vmod_rers, the user is able to add regex/sub pairs on a per-request
basis [4], and they will be acted upon by the VDP. To store and retrieve
the pairs I use the regular "fake vrt_ctx trick"[4], since the VDP has
access to the req struct, it's very easy to build.
However, I'm unable to do the same thing on the VFP side since I have
neither a req (fair) nor a bo.

Is there a big reason for not having access to it, or is it just that
nobody asked for it until now?

Happy new year!

[1]: https://github.com/gquintard/varnish-rs/tree/main/examples/vmod_vdp
[2]: https://github.com/gquintard/varnish-rs/tree/main/examples/vmod_vfp
[3]: https://crates.io/crates/varnish
[4]: https://github.com/gquintard/vmod_rers/blob/v0.0.2/vmod.vcc#L47
[5]: https://github.com/gquintard/vmod_rers/blob/v0.0.2/src/lib.rs#L221
-- 
Guillaume Quintard
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