Move InvoicePayer's Router into ChannelManager

This helps prepare to parameterize ChannelManager with a Router, to eventually
use in trampoline payments.

Author: valentinewallace

lightning-invoice/src/payment.rs

@@ -38,13 +38,13 @@
 //! # use lightning::ln::channelmanager::{ChannelDetails, PaymentId, PaymentSendFailure};
 //! # use lightning::ln::msgs::LightningError;
 //! # use lightning::routing::gossip::NodeId;
-//! # use lightning::routing::router::{InFlightHtlcs, Route, RouteHop, RouteParameters};
+//! # use lightning::routing::router::{InFlightHtlcs, Route, RouteHop, RouteParameters, Router};
 //! # use lightning::routing::scoring::{ChannelUsage, Score};
 //! # use lightning::util::events::{Event, EventHandler, EventsProvider};
 //! # use lightning::util::logger::{Logger, Record};
 //! # use lightning::util::ser::{Writeable, Writer};
 //! # use lightning_invoice::Invoice;
-//! # use lightning_invoice::payment::{InvoicePayer, Payer, Retry, Router};
+//! # use lightning_invoice::payment::{InvoicePayer, Payer, Retry, ScoringRouter};
 //! # use secp256k1::PublicKey;
 //! # use std::cell::RefCell;
 //! # use std::ops::Deref;
@@ -76,7 +76,8 @@
 //! #         &self, payer: &PublicKey, params: &RouteParameters,
 //! #         first_hops: Option<&[&ChannelDetails]>, _inflight_htlcs: InFlightHtlcs
 //! #     ) -> Result<Route, LightningError> { unimplemented!() }
-//! #
+//! # }
+//! # impl ScoringRouter for FakeRouter {
 //! #     fn notify_payment_path_failed(&self, path: &[&RouteHop], short_channel_id: u64) {  unimplemented!() }
 //! #     fn notify_payment_path_successful(&self, path: &[&RouteHop]) {  unimplemented!() }
 //! #     fn notify_payment_probe_successful(&self, path: &[&RouteHop]) {  unimplemented!() }
@@ -144,7 +145,7 @@ use lightning::ln::{PaymentHash, PaymentPreimage, PaymentSecret};
 use lightning::ln::channelmanager::{ChannelDetails, PaymentId, PaymentSendFailure};
 use lightning::ln::msgs::LightningError;
 use lightning::routing::gossip::NodeId;
-use lightning::routing::router::{InFlightHtlcs, PaymentParameters, Route, RouteHop, RouteParameters};
+use lightning::routing::router::{InFlightHtlcs, PaymentParameters, Route, RouteHop, RouteParameters, Router};
 use lightning::util::errors::APIError;
 use lightning::util::events::{Event, EventHandler};
 use lightning::util::logger::Logger;
@@ -175,7 +176,7 @@ use crate::time_utils;
 type ConfiguredTime = time_utils::Eternity;
 
 /// (C-not exported) generally all users should use the [`InvoicePayer`] type alias.
-pub struct InvoicePayerUsingTime<P: Deref, R: Router, L: Deref, E: EventHandler, T: Time>
+pub struct InvoicePayerUsingTime<P: Deref, R: ScoringRouter, L: Deref, E: EventHandler, T: Time>
 where
 	P::Target: Payer,
 	L::Target: Logger,
@@ -264,13 +265,20 @@ pub trait Payer {
 	fn abandon_payment(&self, payment_id: PaymentId);
 }
 
-/// A trait defining behavior for routing an [`Invoice`] payment.
-pub trait Router {
-	/// Finds a [`Route`] between `payer` and `payee` for a payment with the given values.
-	fn find_route(
+/// A trait defining behavior for a [`Router`] implementation that also supports scoring channels
+/// based on payment and probe success/failure.
+///
+/// [`Router`]: lightning::routing::router::Router
+pub trait ScoringRouter: Router {
+	/// Finds a [`Route`] between `payer` and `payee` for a payment with the given values. Includes
+	/// `PaymentHash` and `PaymentId` to be able to correlate the request with a specific payment.
+	fn find_route_with_id(
 		&self, payer: &PublicKey, route_params: &RouteParameters,
-		first_hops: Option<&[&ChannelDetails]>, inflight_htlcs: InFlightHtlcs
-	) -> Result<Route, LightningError>;
+		first_hops: Option<&[&ChannelDetails]>, inflight_htlcs: InFlightHtlcs,
+		_payment_hash: PaymentHash, _payment_id: PaymentId
+	) -> Result<Route, LightningError> {
+		self.find_route(payer, route_params, first_hops, inflight_htlcs)
+	}
 	/// Lets the router know that payment through a specific path has failed.
 	fn notify_payment_path_failed(&self, path: &[&RouteHop], short_channel_id: u64);
 	/// Lets the router know that payment through a specific path was successful.
@@ -320,7 +328,7 @@ pub enum PaymentError {
 	Sending(PaymentSendFailure),
 }
 
-impl<P: Deref, R: Router, L: Deref, E: EventHandler, T: Time> InvoicePayerUsingTime<P, R, L, E, T>
+impl<P: Deref, R: ScoringRouter, L: Deref, E: EventHandler, T: Time> InvoicePayerUsingTime<P, R, L, E, T>
 where
 	P::Target: Payer,
 	L::Target: Logger,
@@ -654,7 +662,7 @@ fn has_expired(route_params: &RouteParameters) -> bool {
 	} else { false }
 }
 
-impl<P: Deref, R: Router, L: Deref, E: EventHandler, T: Time> EventHandler for InvoicePayerUsingTime<P, R, L, E, T>
+impl<P: Deref, R: ScoringRouter, L: Deref, E: EventHandler, T: Time> EventHandler for InvoicePayerUsingTime<P, R, L, E, T>
 where
 	P::Target: Payer,
 	L::Target: Logger,
@@ -740,7 +748,7 @@ mod tests {
 	use lightning::ln::functional_test_utils::*;
 	use lightning::ln::msgs::{ChannelMessageHandler, ErrorAction, LightningError};
 	use lightning::routing::gossip::{EffectiveCapacity, NodeId};
-	use lightning::routing::router::{InFlightHtlcs, PaymentParameters, Route, RouteHop};
+	use lightning::routing::router::{InFlightHtlcs, PaymentParameters, Route, RouteHop, Router};
 	use lightning::routing::scoring::{ChannelUsage, LockableScore, Score};
 	use lightning::util::test_utils::TestLogger;
 	use lightning::util::errors::APIError;
@@ -1814,7 +1822,9 @@ mod tests {
 				payment_params: Some(route_params.payment_params.clone()), ..Self::route_for_value(route_params.final_value_msat)
 			})
 		}
+	}
 
+	impl ScoringRouter for TestRouter {
 		fn notify_payment_path_failed(&self, path: &[&RouteHop], short_channel_id: u64) {
 			self.scorer.lock().payment_path_failed(path, short_channel_id);
 		}
@@ -1841,7 +1851,9 @@ mod tests {
 		) -> Result<Route, LightningError> {
 			Err(LightningError { err: String::new(), action: ErrorAction::IgnoreError })
 		}
+	}
 
+	impl ScoringRouter for FailingRouter {
 		fn notify_payment_path_failed(&self, _path: &[&RouteHop], _short_channel_id: u64) {}
 
 		fn notify_payment_path_successful(&self, _path: &[&RouteHop]) {}
@@ -2103,7 +2115,8 @@ mod tests {
 		) -> Result<Route, LightningError> {
 			self.0.borrow_mut().pop_front().unwrap()
 		}
-
+	}
+	impl ScoringRouter for ManualRouter {
 		fn notify_payment_path_failed(&self, _path: &[&RouteHop], _short_channel_id: u64) {}
 
 		fn notify_payment_path_successful(&self, _path: &[&RouteHop]) {}

lightning-invoice/src/utils.rs

@@ -1,7 +1,7 @@
 //! Convenient utilities to create an invoice.
 
 use crate::{CreationError, Currency, Invoice, InvoiceBuilder, SignOrCreationError};
-use crate::payment::{Payer, Router};
+use crate::payment::{Payer, ScoringRouter};
 
 use crate::{prelude::*, Description, InvoiceDescription, Sha256};
 use bech32::ToBase32;
@@ -16,7 +16,7 @@ use lightning::ln::channelmanager::{PhantomRouteHints, MIN_CLTV_EXPIRY_DELTA};
 use lightning::ln::inbound_payment::{create, create_from_hash, ExpandedKey};
 use lightning::ln::msgs::LightningError;
 use lightning::routing::gossip::{NetworkGraph, NodeId, RoutingFees};
-use lightning::routing::router::{InFlightHtlcs, Route, RouteHint, RouteHintHop, RouteParameters, find_route, RouteHop};
+use lightning::routing::router::{InFlightHtlcs, Route, RouteHint, RouteHintHop, RouteParameters, find_route, RouteHop, Router};
 use lightning::routing::scoring::{ChannelUsage, LockableScore, Score};
 use lightning::util::logger::Logger;
 use secp256k1::PublicKey;
@@ -567,7 +567,12 @@ impl<G: Deref<Target = NetworkGraph<L>>, L: Deref, S: Deref> Router for DefaultR
 			&random_seed_bytes
 		)
 	}
+}
 
+impl<G: Deref<Target = NetworkGraph<L>>, L: Deref, S: Deref> ScoringRouter for DefaultRouter<G, L, S> where
+	L::Target: Logger,
+	S::Target: for <'a> LockableScore<'a>,
+{
 	fn notify_payment_path_failed(&self, path: &[&RouteHop], short_channel_id: u64) {
 		self.scorer.lock().payment_path_failed(path, short_channel_id);
 	}

lightning/src/routing/router.rs

@@ -63,6 +63,15 @@ impl Readable for InFlightHtlcs {
 	}
 }
 
+/// A trait defining behavior for routing an payment.
+pub trait Router {
+	/// Finds a [`Route`] between `payer` and `payee` for a payment with the given values.
+	fn find_route(
+		&self, payer: &PublicKey, route_params: &RouteParameters,
+		first_hops: Option<&[&ChannelDetails]>, inflight_htlcs: InFlightHtlcs
+	) -> Result<Route, LightningError>;
+}
+
 /// A hop in a route
 #[derive(Clone, Debug, Hash, PartialEq, Eq)]
 pub struct RouteHop {