Re: [Bitcoin-development] NODE_EXT_SERVICES and advertising related services

[Wladimir <laanwj@gmail.com>]

On Fri, Aug 8, 2014 at 1:38 PM, Mike Hearn <mike@plan99.net> wrote:
> I'd like to see a mechanism whereby a Bitcoin node can delegate processing
> of unknown messages to an external process, so a P2P node can be composed
> out of separated programs, but such a service would be indistinguishable at
> the network layer from one provided by Bitcoin Core itself, so a service bit
> would be appropriate for those.

This diverges from the topic but seems like a good idea to me in
general, not so much as replacement for jgarzik's proposal.

Something like `getutxos` or this proposal could be implemented as an
external application or script, instead of having to integrate
everything into bitcoind.

Bitcoind would need a local interprocess message bus for that, and
would need to act as router for messages from/to the P2P network.
ZeroMQ seems like a good choice for that. That's not completely crazy
as there are already plans to add zeromq as an optional dependency for
notifications [1].

[1] https://github.com/bitcoin/bitcoin/pull/4594

Wladimir