public inbox for bitcoindev@googlegroups.com
 help / color / mirror / Atom feed
From: Matt Corallo <lf-lists@mattcorallo.com>
To: Jeremy <jlrubin@mit.edu>
Cc: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] Generalizing feature negotiation when new p2p connections are setup
Date: Fri, 21 Aug 2020 18:16:02 -0400	[thread overview]
Message-ID: <afcedaf1-dd69-9402-eeeb-006bb9211b98@mattcorallo.com> (raw)
In-Reply-To: <CAD5xwhjdLJvMd5gpKQXfW5Tr9RV0GTakA0pD3-xzQLHd_nY1OA@mail.gmail.com>

Hmm, could that not be accomplished by simply building this into new messages? eg, send "betterprotocol", if you see a 
verack and no "betterprotocol" from your peer, send "worseprotocol" before you send a "verack".

Matt

On 8/21/20 5:17 PM, Jeremy wrote:
> As for an example of where you'd want multi-round, you could imagine a scenario where you have a feature A which gets 
> bugfixed by the introduction of feature B, and you don't want to expose that you support A unless you first negotiate B. 
> Or if you can negotiate B you should never expose A, but for old nodes you'll still do it if B is unknown to them. An 
> example of this would be (were it not already out without a feature negotiation existing) WTXID/TXID relay.
> 
> The SYNC primitve simply codifies what order messages should be in and when you're done for a phase of negotiation 
> offering something. It can be done without, but then you have to be more careful to broadcast in the correct order and 
> it's not clear when/if you should wait for more time before responding.
> 
> 
> On Fri, Aug 21, 2020 at 2:08 PM Jeremy <jlrubin@mit.edu <mailto:jlrubin@mit.edu>> wrote:
> 
>     Actually we already have service bits (which are sadly limited) which allow negotiation of non bilateral feature
>     support, so this would supercede that.
>     --
>     @JeremyRubin <https://twitter.com/JeremyRubin><https://twitter.com/JeremyRubin>
> 


  reply	other threads:[~2020-08-21 22:16 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-14 19:28 [bitcoin-dev] Generalizing feature negotiation when new p2p connections are setup Suhas Daftuar
2020-08-16 17:24 ` Jeremy
2020-08-16 19:06 ` Eric Voskuil
2020-08-17 20:40   ` Suhas Daftuar
2020-08-17 21:21     ` Eric Voskuil
2020-08-20 14:13   ` David A. Harding
2020-08-18 14:59 ` Matt Corallo
2020-08-18 16:54   ` Eric Voskuil
2020-08-18 17:26     ` Matt Corallo
2020-08-18 18:11       ` Eric Voskuil
2020-08-18 18:25         ` Matt Corallo
2020-08-18 18:56           ` Eric Voskuil
2020-08-21  2:36 ` Anthony Towns
2020-08-21  4:25   ` Eric Voskuil
2020-08-21 14:15   ` lf-lists
2020-08-21 16:42     ` Eric Voskuil
2020-08-21 19:50       ` Jeremy
2020-08-21 20:45         ` Matt Corallo
2020-08-21 21:08           ` Jeremy
2020-08-21 21:17             ` Jeremy
2020-08-21 22:16               ` Matt Corallo [this message]
2020-08-23 17:49                 ` Eric Voskuil
2020-08-24  9:44                   ` Suhas Daftuar
2020-08-24 13:59                     ` G. Andrew Stone
2020-08-24 19:58                   ` Jeremy
2020-08-24 20:17                     ` Eric Voskuil
2020-08-24 20:21                       ` Jeremy
2020-08-24 20:33                         ` Eric Voskuil
2020-08-21 21:17             ` Eric Voskuil
2020-08-23 17:45           ` Eric Voskuil

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=afcedaf1-dd69-9402-eeeb-006bb9211b98@mattcorallo.com \
    --to=lf-lists@mattcorallo.com \
    --cc=bitcoin-dev@lists.linuxfoundation.org \
    --cc=jlrubin@mit.edu \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox