[Bitcoin-development] NODE_EXT_SERVICES and advertising related services

Jeff Garzik jgarzik at bitpay.com
Fri Aug 8 11:22:46 UTC 2014


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 at 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 at gmail.com> wrote:
>>
>> On Fri, Aug 8, 2014 at 12:15 PM, Wladimir <laanwj at gmail.com> wrote:
>> > On Fri, Aug 8, 2014 at 12:01 PM, Mike Hearn <mike at 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
>>
>>
>> ------------------------------------------------------------------------------
>> Want fast and easy access to all the code in your enterprise? Index and
>> search up to 200,000 lines of code with a free copy of Black Duck
>> Code Sight - the same software that powers the world's largest code
>> search on Ohloh, the Black Duck Open Hub! Try it now.
>> http://p.sf.net/sfu/bds
>> _______________________________________________
>> Bitcoin-development mailing list
>> Bitcoin-development at lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>
>
>
> ------------------------------------------------------------------------------
> Want fast and easy access to all the code in your enterprise? Index and
> search up to 200,000 lines of code with a free copy of Black Duck
> Code Sight - the same software that powers the world's largest code
> search on Ohloh, the Black Duck Open Hub! Try it now.
> http://p.sf.net/sfu/bds
> _______________________________________________
> Bitcoin-development mailing list
> Bitcoin-development at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>



-- 
Jeff Garzik
Bitcoin core developer and open source evangelist
BitPay, Inc.      https://bitpay.com/




More information about the bitcoin-dev mailing list