From: Jeff Garzik <jgarzik@bitpay•com>
To: Christian Decker <decker.christian@gmail•com>
Cc: Bitcoin Dev <bitcoin-development@lists•sourceforge.net>
Subject: Re: [Bitcoin-development] NODE_EXT_SERVICES and advertising related services
Date: Fri, 8 Aug 2014 07:22:46 -0400 [thread overview]
Message-ID: <CAJHLa0NwzLcGcKLyJVFhXoc49CRnSaqYnSbi=Z8FFXWQir0e9A@mail.gmail.com> (raw)
In-Reply-To: <CALxbBHXPCpZ9npacPOgU2q6=xTpcOVi2fJ+C8v93U2Oyuorrgw@mail.gmail.com>
This is not a generic "I run a website!" advertisement feature.
NODE_EXT_SERVICES is tightly focused on services that exist
if-any-only-if a P2P bitcoin node (bitcoind) is reachable via the same
advertised address.
You may usefully create overlay networks of specialized services.
On Fri, Aug 8, 2014 at 6:41 AM, Christian Decker
<decker.christian@gmail•com> wrote:
> I wonder whether we actually want to support this kind of advertisement in
> the P2P protocol. We have a working mechanism for protocol extensions in the
> P2P network (service flags) so this is obviously only for services that are
> not P2P extensions, so why have them in there at all?
>
> I'd argue that a parallel network, external to Bitcoin, could take over the
> task of advertising external services.
>
> Regards,
> Chris
>
> --
> Christian Decker
>
>
> On Fri, Aug 8, 2014 at 11:26 AM, Wladimir <laanwj@gmail•com> wrote:
>>
>> On Fri, Aug 8, 2014 at 12:15 PM, Wladimir <laanwj@gmail•com> wrote:
>> > On Fri, Aug 8, 2014 at 12:01 PM, Mike Hearn <mike@plan99•net> wrote:
>> >>> He wants to use it to advertise services that are not part of the P2P
>> >>> protocol itself, but run on a different port. Reserving services bits
>> >>> for those is not acceptable.
>> >>
>> >>
>> >> Why not? Does the port matter much?
>> >
>> > Yes. The services bits are for advertising services on the P2P
>> > network. That's not open for discussion.
>>
>> It also wouldn't work. A bit is not enough to find an external service
>> except in the naive case where the advertised service would have a
>> fixed port. Not even bitcoind has a fixed port. So there needs to be a
>> mechanism to find how to connect to the 'external service'. This is
>> provided by the proposed extension.
>>
>> It would in principle be possible to advertise an extra service bit
>> *in addition to* this one, to make it easier to find through the addr
>> mechanism. But it would be confusing and IMO an abuse of P2P service
>> bits.
>>
>> Wladimir
>>
>>
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>
>
>
> ------------------------------------------------------------------------------
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--
Jeff Garzik
Bitcoin core developer and open source evangelist
BitPay, Inc. https://bitpay.com/
next prev parent reply other threads:[~2014-08-08 11:23 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-08 3:38 Jeff Garzik
2014-08-08 9:45 ` Mike Hearn
2014-08-08 9:56 ` Wladimir
2014-08-08 10:01 ` Mike Hearn
2014-08-08 10:15 ` Wladimir
2014-08-08 10:26 ` Wladimir
2014-08-08 10:41 ` Christian Decker
2014-08-08 11:22 ` Jeff Garzik [this message]
2014-08-08 11:33 ` Jeff Garzik
2014-08-08 11:38 ` Mike Hearn
2014-08-08 11:59 ` Wladimir
2014-08-08 12:06 ` Jeff Garzik
2014-08-08 12:11 ` Jeff Garzik
2014-08-08 12:15 ` Wladimir
2014-08-08 12:11 ` Mike Hearn
2014-08-08 12:15 ` Jeff Garzik
2014-08-08 12:16 ` Wladimir
2014-08-08 12:34 ` Wladimir
2014-08-08 13:55 ` Mike Hearn
2014-08-08 12:04 ` Jeff Garzik
2014-08-08 12:13 ` Mike Hearn
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