listen to hold invoice from subscribeToInvoices

[nicolasburtey]

Background

We want to listen to invoices that are been held from a single listener.

Your environment

• version of lnd: 0.14.2

Steps to reproduce

using the lightning library, we are looking to listen to all the invoices that are been updated, and held, whenever a payment arrives.

Currently the only way to do it is to run SubscribeToInvoice on each individual invoice. but this introduce a state where we need in our backend to know precisely which invoice we are listening to, which is hard to do because we run our instance in a kubernetes environment and we're assuming the pod to be stateless/could restart any time without notice.

The right alternative would be to use SubscribeToInvoices (with a s), so that we don't have to listen to each invoice individually.

Unfortunately, SubscribeToInvoices doesn't provide events for held invoices.

[alexbosworth]

Related #3120 ?

[Roasbeef]

Yep duplicate of #3120

[nicolasburtey]

thanks. couldn't find the related ticket.