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Always-online node forward invoice request #4049

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10295e1
Update OnionMessage with link to BOLTs
elnosh Aug 28, 2025
d3a9732
Use correct nonce in InvoiceRequest context
elnosh Aug 29, 2025
5edc82a
Forward invoice requests to async recipient
elnosh Aug 29, 2025
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27 changes: 22 additions & 5 deletions lightning/src/events/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,7 @@ pub mod bump_transaction;

pub use bump_transaction::BumpTransactionEvent;

use crate::blinded_path::message::OffersContext;
use crate::blinded_path::message::{BlindedMessagePath, OffersContext};
use crate::blinded_path::payment::{
Bolt12OfferContext, Bolt12RefundContext, PaymentContext, PaymentContextRef,
};
Expand All @@ -28,6 +28,7 @@ use crate::ln::channelmanager::{InterceptId, PaymentId, RecipientOnionFields};
use crate::ln::types::ChannelId;
use crate::ln::{msgs, LocalHTLCFailureReason};
use crate::offers::invoice::Bolt12Invoice;
use crate::offers::invoice_request::InvoiceRequest;
use crate::offers::static_invoice::StaticInvoice;
use crate::onion_message::messenger::Responder;
use crate::routing::gossip::NetworkUpdate;
Expand Down Expand Up @@ -1654,6 +1655,15 @@ pub enum Event {
/// The invoice that should be persisted and later provided to payers when handling a future
/// [`Event::StaticInvoiceRequested`].
invoice: StaticInvoice,
/// The path to where invoice requests will be forwarded. As a static invoice
/// server, if we receive an invoice request on behalf of an async recipient, a static
/// invoice will be provided to the payer. However, we'll also forward the invoice
/// request to this path to the async recipient in case it is online so that the
/// recipient can provide a new invoice. This path should be persisted and later
/// provided to [`ChannelManager::send_response_static_invoice_request`].
///
/// [`ChannelManager::send_response_static_invoice_request`]: crate::ln::channelmanager::ChannelManager::send_response_static_invoice_request
invoice_request_path: BlindedMessagePath,
/// Useful for the recipient to replace a specific invoice stored by us as the static invoice
/// server.
///
Expand Down Expand Up @@ -1686,12 +1696,14 @@ pub enum Event {
///
/// If we previously persisted a [`StaticInvoice`] from an [`Event::PersistStaticInvoice`] that
/// matches the below `recipient_id` and `invoice_slot`, that invoice should be retrieved now
/// and forwarded to the payer via [`ChannelManager::send_static_invoice`].
/// and forwarded to the payer via [`ChannelManager::send_response_static_invoice_request`].
/// The invoice request path previously persisted from [`Event::PersistStaticInvoice`] should
/// also be provided in [`ChannelManager::send_response_static_invoice_request`].
///
/// [`ChannelManager::blinded_paths_for_async_recipient`]: crate::ln::channelmanager::ChannelManager::blinded_paths_for_async_recipient
/// [`ChannelManager::set_paths_to_static_invoice_server`]: crate::ln::channelmanager::ChannelManager::set_paths_to_static_invoice_server
/// [`InvoiceRequest`]: crate::offers::invoice_request::InvoiceRequest
/// [`ChannelManager::send_static_invoice`]: crate::ln::channelmanager::ChannelManager::send_static_invoice
/// [`ChannelManager::send_response_static_invoice_request`]: crate::ln::channelmanager::ChannelManager::send_response_static_invoice_request
StaticInvoiceRequested {
/// An identifier for the recipient previously surfaced in
/// [`Event::PersistStaticInvoice::recipient_id`]. Useful when paired with the `invoice_slot` to
Expand All @@ -1702,10 +1714,15 @@ pub enum Event {
/// retrieve the [`StaticInvoice`] requested by the payer.
invoice_slot: u16,
/// The path over which the [`StaticInvoice`] will be sent to the payer, which should be
/// provided to [`ChannelManager::send_static_invoice`] along with the invoice.
/// provided to [`ChannelManager::send_response_static_invoice_request`] along with the invoice.
///
/// [`ChannelManager::send_static_invoice`]: crate::ln::channelmanager::ChannelManager::send_static_invoice
/// [`ChannelManager::send_response_static_invoice_request`]: crate::ln::channelmanager::ChannelManager::send_response_static_invoice_request
reply_path: Responder,
/// The invoice request that will be forwarded to the async recipient to give it a
/// chance to provide an invoice in case it is online. It should be provided to [`ChannelManager::send_response_static_invoice_request`].
///
/// [`ChannelManager::send_response_static_invoice_request`]: crate::ln::channelmanager::ChannelManager::send_response_static_invoice_request
invoice_request: InvoiceRequest,
},
/// Indicates that a channel funding transaction constructed interactively is ready to be
/// signed. This event will only be triggered if at least one input was contributed.
Expand Down
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