Drop separate `Locked` type on `LockableScore`
[rust-lightning] / lightning / src / routing / router.rs
index caba139103249179228738a6aa7bca3c0e54c378..822c4842cbaf8e92e134825cf0592393420a7667 100644 (file)
@@ -33,31 +33,31 @@ use core::{cmp, fmt};
 use core::ops::{Deref, DerefMut};
 
 /// A [`Router`] implemented using [`find_route`].
-pub struct DefaultRouter<G: Deref<Target = NetworkGraph<L>>, L: Deref, S: Deref, SP: Sized, Sc: Score<ScoreParams = SP>> where
+pub struct DefaultRouter<G: Deref<Target = NetworkGraph<L>>, L: Deref, S: Deref> where
        L::Target: Logger,
-       S::Target: for <'a> LockableScore<'a, Score = Sc>,
+       S::Target: for <'a> LockableScore<'a>,
 {
        network_graph: G,
        logger: L,
        random_seed_bytes: Mutex<[u8; 32]>,
        scorer: S,
-       score_params: SP
+       score_params: crate::routing::scoring::ProbabilisticScoringFeeParameters,
 }
 
-impl<G: Deref<Target = NetworkGraph<L>>, L: Deref, S: Deref, SP: Sized, Sc: Score<ScoreParams = SP>> DefaultRouter<G, L, S, SP, Sc> where
+impl<G: Deref<Target = NetworkGraph<L>>, L: Deref, S: Deref> DefaultRouter<G, L, S> where
        L::Target: Logger,
-       S::Target: for <'a> LockableScore<'a, Score = Sc>,
+       S::Target: for <'a> LockableScore<'a>,
 {
        /// Creates a new router.
-       pub fn new(network_graph: G, logger: L, random_seed_bytes: [u8; 32], scorer: S, score_params: SP) -> Self {
+       pub fn new(network_graph: G, logger: L, random_seed_bytes: [u8; 32], scorer: S, score_params: crate::routing::scoring::ProbabilisticScoringFeeParameters) -> Self {
                let random_seed_bytes = Mutex::new(random_seed_bytes);
                Self { network_graph, logger, random_seed_bytes, scorer, score_params }
        }
 }
 
-impl< G: Deref<Target = NetworkGraph<L>>, L: Deref, S: Deref, SP: Sized, Sc: Score<ScoreParams = SP>> Router for DefaultRouter<G, L, S, SP, Sc> where
+impl< G: Deref<Target = NetworkGraph<L>>, L: Deref, S: Deref> Router for DefaultRouter<G, L, S> where
        L::Target: Logger,
-       S::Target: for <'a> LockableScore<'a, Score = Sc>,
+       S::Target: for <'a> LockableScore<'a>,
 {
        fn find_route(
                &self,
@@ -73,7 +73,7 @@ impl< G: Deref<Target = NetworkGraph<L>>, L: Deref, S: Deref, SP: Sized, Sc: Sco
                };
                find_route(
                        payer, params, &self.network_graph, first_hops, &*self.logger,
-                       &ScorerAccountingForInFlightHtlcs::new(self.scorer.lock().deref_mut(), &inflight_htlcs),
+                       &ScorerAccountingForInFlightHtlcs::new(self.scorer.lock(), &inflight_htlcs),
                        &self.score_params,
                        &random_seed_bytes
                )
@@ -112,15 +112,15 @@ pub trait Router {
 /// [`find_route`].
 ///
 /// [`Score`]: crate::routing::scoring::Score
-pub struct ScorerAccountingForInFlightHtlcs<'a, S: Score<ScoreParams = SP>, SP: Sized> {
-       scorer: &'a mut S,
+pub struct ScorerAccountingForInFlightHtlcs<'a, S: Score> {
+       scorer: S,
        // Maps a channel's short channel id and its direction to the liquidity used up.
        inflight_htlcs: &'a InFlightHtlcs,
 }
 
-impl<'a, S: Score<ScoreParams = SP>, SP: Sized> ScorerAccountingForInFlightHtlcs<'a, S, SP> {
+impl<'a, S: Score> ScorerAccountingForInFlightHtlcs<'a, S> {
        /// Initialize a new `ScorerAccountingForInFlightHtlcs`.
-       pub fn new(scorer: &'a mut S, inflight_htlcs: &'a InFlightHtlcs) -> Self {
+       pub fn new(scorer: S, inflight_htlcs: &'a InFlightHtlcs) -> Self {
                ScorerAccountingForInFlightHtlcs {
                        scorer,
                        inflight_htlcs
@@ -129,13 +129,14 @@ impl<'a, S: Score<ScoreParams = SP>, SP: Sized> ScorerAccountingForInFlightHtlcs
 }
 
 #[cfg(c_bindings)]
-impl<'a, S: Score<ScoreParams = SP>, SP: Sized> Writeable for ScorerAccountingForInFlightHtlcs<'a, S, SP> {
+impl<'a, S: Score> Writeable for ScorerAccountingForInFlightHtlcs<'a, S> {
        fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> { self.scorer.write(writer) }
 }
 
-impl<'a, S: Score<ScoreParams = SP>, SP: Sized> Score for ScorerAccountingForInFlightHtlcs<'a, S, SP>  {
+impl<'a, S: Score> Score for ScorerAccountingForInFlightHtlcs<'a, S>  {
+       #[cfg(not(c_bindings))]
        type ScoreParams = S::ScoreParams;
-       fn channel_penalty_msat(&self, short_channel_id: u64, source: &NodeId, target: &NodeId, usage: ChannelUsage, score_params: &Self::ScoreParams) -> u64 {
+       fn channel_penalty_msat(&self, short_channel_id: u64, source: &NodeId, target: &NodeId, usage: ChannelUsage, score_params: &crate::routing::scoring::ProbabilisticScoringFeeParameters) -> u64 {
                if let Some(used_liquidity) = self.inflight_htlcs.used_liquidity_msat(
                        source, target, short_channel_id
                ) {
@@ -1333,6 +1334,14 @@ impl<'a> fmt::Display for LoggedCandidateHop<'a> {
                                " and blinding point ".fmt(f)?;
                                hint.1.blinding_point.fmt(f)
                        },
+                       CandidateRouteHop::FirstHop { .. } => {
+                               "first hop with SCID ".fmt(f)?;
+                               self.0.short_channel_id().unwrap().fmt(f)
+                       },
+                       CandidateRouteHop::PrivateHop { .. } => {
+                               "route hint with SCID ".fmt(f)?;
+                               self.0.short_channel_id().unwrap().fmt(f)
+                       },
                        _ => {
                                "SCID ".fmt(f)?;
                                self.0.short_channel_id().unwrap().fmt(f)
@@ -1404,7 +1413,7 @@ fn sort_first_hop_channels(
 pub fn find_route<L: Deref, GL: Deref, S: Score>(
        our_node_pubkey: &PublicKey, route_params: &RouteParameters,
        network_graph: &NetworkGraph<GL>, first_hops: Option<&[&ChannelDetails]>, logger: L,
-       scorer: &S, score_params: &S::ScoreParams, random_seed_bytes: &[u8; 32]
+       scorer: &S, score_params: &crate::routing::scoring::ProbabilisticScoringFeeParameters, random_seed_bytes: &[u8; 32]
 ) -> Result<Route, LightningError>
 where L::Target: Logger, GL::Target: Logger {
        let graph_lock = network_graph.read_only();
@@ -1417,7 +1426,7 @@ where L::Target: Logger, GL::Target: Logger {
 
 pub(crate) fn get_route<L: Deref, S: Score>(
        our_node_pubkey: &PublicKey, payment_params: &PaymentParameters, network_graph: &ReadOnlyNetworkGraph,
-       first_hops: Option<&[&ChannelDetails]>, final_value_msat: u64, logger: L, scorer: &S, score_params: &S::ScoreParams,
+       first_hops: Option<&[&ChannelDetails]>, final_value_msat: u64, logger: L, scorer: &S, score_params: &crate::routing::scoring::ProbabilisticScoringFeeParameters,
        _random_seed_bytes: &[u8; 32]
 ) -> Result<Route, LightningError>
 where L::Target: Logger {
@@ -1640,6 +1649,12 @@ where L::Target: Logger {
        log_trace!(logger, "Building path from {} to payer {} for value {} msat.",
                LoggedPayeePubkey(payment_params.payee.node_id()), our_node_pubkey, final_value_msat);
 
+       // Remember how many candidates we ignored to allow for some logging afterwards.
+       let mut num_ignored_value_contribution = 0;
+       let mut num_ignored_path_length_limit = 0;
+       let mut num_ignored_cltv_delta_limit = 0;
+       let mut num_ignored_previously_failed = 0;
+
        macro_rules! add_entry {
                // Adds entry which goes from $src_node_id to $dest_node_id over the $candidate hop.
                // $next_hops_fee_msat represents the fees paid for using all the channels *after* this one,
@@ -1714,13 +1729,37 @@ where L::Target: Logger {
                                        let payment_failed_on_this_channel = scid_opt.map_or(false,
                                                |scid| payment_params.previously_failed_channels.contains(&scid));
 
+                                       let should_log_candidate = match $candidate {
+                                               CandidateRouteHop::FirstHop { .. } => true,
+                                               CandidateRouteHop::PrivateHop { .. } => true,
+                                               CandidateRouteHop::Blinded { .. } => true,
+                                               _ => false,
+                                       };
+
                                        // If HTLC minimum is larger than the amount we're going to transfer, we shouldn't
                                        // bother considering this channel. If retrying with recommended_value_msat may
                                        // allow us to hit the HTLC minimum limit, set htlc_minimum_limit so that we go
                                        // around again with a higher amount.
-                                       if !contributes_sufficient_value || exceeds_max_path_length ||
-                                               exceeds_cltv_delta_limit || payment_failed_on_this_channel {
-                                               // Path isn't useful, ignore it and move on.
+                                       if !contributes_sufficient_value {
+                                               if should_log_candidate {
+                                                       log_trace!(logger, "Ignoring {} due to insufficient value contribution.", LoggedCandidateHop(&$candidate));
+                                               }
+                                               num_ignored_value_contribution += 1;
+                                       } else if exceeds_max_path_length {
+                                               if should_log_candidate {
+                                                       log_trace!(logger, "Ignoring {} due to exceeding maximum path length limit.", LoggedCandidateHop(&$candidate));
+                                               }
+                                               num_ignored_path_length_limit += 1;
+                                       } else if exceeds_cltv_delta_limit {
+                                               if should_log_candidate {
+                                                       log_trace!(logger, "Ignoring {} due to exceeding CLTV delta limit.", LoggedCandidateHop(&$candidate));
+                                               }
+                                               num_ignored_cltv_delta_limit += 1;
+                                       } else if payment_failed_on_this_channel {
+                                               if should_log_candidate {
+                                                       log_trace!(logger, "Ignoring {} due to a failed previous payment attempt.", LoggedCandidateHop(&$candidate));
+                                               }
+                                               num_ignored_previously_failed += 1;
                                        } else if may_overpay_to_meet_path_minimum_msat {
                                                hit_minimum_limit = true;
                                        } else if over_path_minimum_msat {
@@ -2322,6 +2361,12 @@ where L::Target: Logger {
                }
        }
 
+       let num_ignored_total = num_ignored_value_contribution + num_ignored_path_length_limit +
+               num_ignored_cltv_delta_limit + num_ignored_previously_failed;
+       if num_ignored_total > 0 {
+               log_trace!(logger, "Ignored {} candidate hops due to insufficient value contribution, {} due to path length limit, {} due to CLTV delta limit, {} due to previous payment failure. Total: {} ignored candidates.", num_ignored_value_contribution, num_ignored_path_length_limit, num_ignored_cltv_delta_limit, num_ignored_previously_failed, num_ignored_total);
+       }
+
        // Step (5).
        if payment_paths.len() == 0 {
                return Err(LightningError{err: "Failed to find a path to the given destination".to_owned(), action: ErrorAction::IgnoreError});
@@ -2570,9 +2615,10 @@ fn build_route_from_hops_internal<L: Deref>(
        }
 
        impl Score for HopScorer {
+               #[cfg(not(c_bindings))]
                type ScoreParams = ();
                fn channel_penalty_msat(&self, _short_channel_id: u64, source: &NodeId, target: &NodeId,
-                       _usage: ChannelUsage, _score_params: &Self::ScoreParams) -> u64
+                       _usage: ChannelUsage, _score_params: &crate::routing::scoring::ProbabilisticScoringFeeParameters) -> u64
                {
                        let mut cur_id = self.our_node_id;
                        for i in 0..self.hop_ids.len() {
@@ -2617,7 +2663,7 @@ fn build_route_from_hops_internal<L: Deref>(
        let scorer = HopScorer { our_node_id, hop_ids };
 
        get_route(our_node_pubkey, payment_params, network_graph, None, final_value_msat,
-               logger, &scorer, &(), random_seed_bytes)
+               logger, &scorer, &Default::default(), random_seed_bytes)
 }
 
 #[cfg(test)]
@@ -2710,11 +2756,11 @@ mod tests {
 
                // Simple route to 2 via 1
 
-               if let Err(LightningError{err, action: ErrorAction::IgnoreError}) = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 0, Arc::clone(&logger), &scorer, &(), &random_seed_bytes) {
+               if let Err(LightningError{err, action: ErrorAction::IgnoreError}) = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 0, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes) {
                        assert_eq!(err, "Cannot send a payment of 0 msat");
                } else { panic!(); }
 
-               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                assert_eq!(route.paths[0].hops.len(), 2);
 
                assert_eq!(route.paths[0].hops[0].pubkey, nodes[1]);
@@ -2746,11 +2792,11 @@ mod tests {
                let our_chans = vec![get_channel_details(Some(2), our_id, InitFeatures::from_le_bytes(vec![0b11]), 100000)];
 
                if let Err(LightningError{err, action: ErrorAction::IgnoreError}) =
-                       get_route(&our_id, &payment_params, &network_graph.read_only(), Some(&our_chans.iter().collect::<Vec<_>>()), 100, Arc::clone(&logger), &scorer, &(), &random_seed_bytes) {
+                       get_route(&our_id, &payment_params, &network_graph.read_only(), Some(&our_chans.iter().collect::<Vec<_>>()), 100, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes) {
                        assert_eq!(err, "First hop cannot have our_node_pubkey as a destination.");
                } else { panic!(); }
 
-               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                assert_eq!(route.paths[0].hops.len(), 2);
        }
 
@@ -2858,7 +2904,7 @@ mod tests {
                });
 
                // Not possible to send 199_999_999, because the minimum on channel=2 is 200_000_000.
-               if let Err(LightningError{err, action: ErrorAction::IgnoreError}) = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 199_999_999, Arc::clone(&logger), &scorer, &(), &random_seed_bytes) {
+               if let Err(LightningError{err, action: ErrorAction::IgnoreError}) = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 199_999_999, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes) {
                        assert_eq!(err, "Failed to find a path to the given destination");
                } else { panic!(); }
 
@@ -2877,7 +2923,7 @@ mod tests {
                });
 
                // A payment above the minimum should pass
-               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 199_999_999, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 199_999_999, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                assert_eq!(route.paths[0].hops.len(), 2);
        }
 
@@ -2959,7 +3005,7 @@ mod tests {
                        excess_data: Vec::new()
                });
 
-               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 60_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 60_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                // Overpay fees to hit htlc_minimum_msat.
                let overpaid_fees = route.paths[0].hops[0].fee_msat + route.paths[1].hops[0].fee_msat;
                // TODO: this could be better balanced to overpay 10k and not 15k.
@@ -3004,14 +3050,14 @@ mod tests {
                        excess_data: Vec::new()
                });
 
-               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 60_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 60_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                // Fine to overpay for htlc_minimum_msat if it allows us to save fee.
                assert_eq!(route.paths.len(), 1);
                assert_eq!(route.paths[0].hops[0].short_channel_id, 12);
                let fees = route.paths[0].hops[0].fee_msat;
                assert_eq!(fees, 5_000);
 
-               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 50_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 50_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                // Not fine to overpay for htlc_minimum_msat if it requires paying more than fee on
                // the other channel.
                assert_eq!(route.paths.len(), 1);
@@ -3056,13 +3102,13 @@ mod tests {
                });
 
                // If all the channels require some features we don't understand, route should fail
-               if let Err(LightningError{err, action: ErrorAction::IgnoreError}) = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100, Arc::clone(&logger), &scorer, &(), &random_seed_bytes) {
+               if let Err(LightningError{err, action: ErrorAction::IgnoreError}) = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes) {
                        assert_eq!(err, "Failed to find a path to the given destination");
                } else { panic!(); }
 
                // If we specify a channel to node7, that overrides our local channel view and that gets used
                let our_chans = vec![get_channel_details(Some(42), nodes[7].clone(), InitFeatures::from_le_bytes(vec![0b11]), 250_000_000)];
-               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), Some(&our_chans.iter().collect::<Vec<_>>()), 100, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), Some(&our_chans.iter().collect::<Vec<_>>()), 100, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                assert_eq!(route.paths[0].hops.len(), 2);
 
                assert_eq!(route.paths[0].hops[0].pubkey, nodes[7]);
@@ -3097,13 +3143,13 @@ mod tests {
                add_or_update_node(&gossip_sync, &secp_ctx, &privkeys[7], unknown_features.clone(), 1);
 
                // If all nodes require some features we don't understand, route should fail
-               if let Err(LightningError{err, action: ErrorAction::IgnoreError}) = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100, Arc::clone(&logger), &scorer, &(), &random_seed_bytes) {
+               if let Err(LightningError{err, action: ErrorAction::IgnoreError}) = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes) {
                        assert_eq!(err, "Failed to find a path to the given destination");
                } else { panic!(); }
 
                // If we specify a channel to node7, that overrides our local channel view and that gets used
                let our_chans = vec![get_channel_details(Some(42), nodes[7].clone(), InitFeatures::from_le_bytes(vec![0b11]), 250_000_000)];
-               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), Some(&our_chans.iter().collect::<Vec<_>>()), 100, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), Some(&our_chans.iter().collect::<Vec<_>>()), 100, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                assert_eq!(route.paths[0].hops.len(), 2);
 
                assert_eq!(route.paths[0].hops[0].pubkey, nodes[7]);
@@ -3135,7 +3181,7 @@ mod tests {
 
                // Route to 1 via 2 and 3 because our channel to 1 is disabled
                let payment_params = PaymentParameters::from_node_id(nodes[0], 42);
-               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                assert_eq!(route.paths[0].hops.len(), 3);
 
                assert_eq!(route.paths[0].hops[0].pubkey, nodes[1]);
@@ -3162,7 +3208,7 @@ mod tests {
                // If we specify a channel to node7, that overrides our local channel view and that gets used
                let payment_params = PaymentParameters::from_node_id(nodes[2], 42);
                let our_chans = vec![get_channel_details(Some(42), nodes[7].clone(), InitFeatures::from_le_bytes(vec![0b11]), 250_000_000)];
-               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), Some(&our_chans.iter().collect::<Vec<_>>()), 100, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), Some(&our_chans.iter().collect::<Vec<_>>()), 100, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                assert_eq!(route.paths[0].hops.len(), 2);
 
                assert_eq!(route.paths[0].hops[0].pubkey, nodes[7]);
@@ -3285,13 +3331,13 @@ mod tests {
                invalid_last_hops.push(invalid_last_hop);
                {
                        let payment_params = PaymentParameters::from_node_id(nodes[6], 42).with_route_hints(invalid_last_hops).unwrap();
-                       if let Err(LightningError{err, action: ErrorAction::IgnoreError}) = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100, Arc::clone(&logger), &scorer, &(), &random_seed_bytes) {
+                       if let Err(LightningError{err, action: ErrorAction::IgnoreError}) = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes) {
                                assert_eq!(err, "Route hint cannot have the payee as the source.");
                        } else { panic!(); }
                }
 
                let payment_params = PaymentParameters::from_node_id(nodes[6], 42).with_route_hints(last_hops_multi_private_channels(&nodes)).unwrap();
-               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                assert_eq!(route.paths[0].hops.len(), 5);
 
                assert_eq!(route.paths[0].hops[0].pubkey, nodes[1]);
@@ -3367,7 +3413,7 @@ mod tests {
 
                // Test handling of an empty RouteHint passed in Invoice.
 
-               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                assert_eq!(route.paths[0].hops.len(), 5);
 
                assert_eq!(route.paths[0].hops[0].pubkey, nodes[1]);
@@ -3473,7 +3519,7 @@ mod tests {
                        excess_data: Vec::new()
                });
 
-               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                assert_eq!(route.paths[0].hops.len(), 4);
 
                assert_eq!(route.paths[0].hops[0].pubkey, nodes[1]);
@@ -3545,7 +3591,7 @@ mod tests {
                        excess_data: Vec::new()
                });
 
-               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100, Arc::clone(&logger), &scorer, &(), &[42u8; 32]).unwrap();
+               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100, Arc::clone(&logger), &scorer, &Default::default(), &[42u8; 32]).unwrap();
                assert_eq!(route.paths[0].hops.len(), 4);
 
                assert_eq!(route.paths[0].hops[0].pubkey, nodes[1]);
@@ -3627,7 +3673,7 @@ mod tests {
                // This test shows that public routes can be present in the invoice
                // which would be handled in the same manner.
 
-               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                assert_eq!(route.paths[0].hops.len(), 5);
 
                assert_eq!(route.paths[0].hops[0].pubkey, nodes[1]);
@@ -3680,7 +3726,7 @@ mod tests {
                let our_chans = vec![get_channel_details(Some(42), nodes[3].clone(), InitFeatures::from_le_bytes(vec![0b11]), 250_000_000)];
                let mut last_hops = last_hops(&nodes);
                let payment_params = PaymentParameters::from_node_id(nodes[6], 42).with_route_hints(last_hops.clone()).unwrap();
-               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), Some(&our_chans.iter().collect::<Vec<_>>()), 100, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), Some(&our_chans.iter().collect::<Vec<_>>()), 100, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                assert_eq!(route.paths[0].hops.len(), 2);
 
                assert_eq!(route.paths[0].hops[0].pubkey, nodes[3]);
@@ -3701,7 +3747,7 @@ mod tests {
 
                // Revert to via 6 as the fee on 8 goes up
                let payment_params = PaymentParameters::from_node_id(nodes[6], 42).with_route_hints(last_hops).unwrap();
-               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                assert_eq!(route.paths[0].hops.len(), 4);
 
                assert_eq!(route.paths[0].hops[0].pubkey, nodes[1]);
@@ -3735,7 +3781,7 @@ mod tests {
                assert_eq!(route.paths[0].hops[3].channel_features.le_flags(), &Vec::<u8>::new()); // We can't learn any flags from invoices, sadly
 
                // ...but still use 8 for larger payments as 6 has a variable feerate
-               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 2000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 2000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                assert_eq!(route.paths[0].hops.len(), 5);
 
                assert_eq!(route.paths[0].hops[0].pubkey, nodes[1]);
@@ -3801,7 +3847,7 @@ mod tests {
                let logger = ln_test_utils::TestLogger::new();
                let network_graph = NetworkGraph::new(Network::Testnet, &logger);
                let route = get_route(&source_node_id, &payment_params, &network_graph.read_only(),
-                               Some(&our_chans.iter().collect::<Vec<_>>()), route_val, &logger, &scorer, &(), &random_seed_bytes);
+                               Some(&our_chans.iter().collect::<Vec<_>>()), route_val, &logger, &scorer, &Default::default(), &random_seed_bytes);
                route
        }
 
@@ -3923,14 +3969,14 @@ mod tests {
                {
                        // Attempt to route more than available results in a failure.
                        if let Err(LightningError{err, action: ErrorAction::IgnoreError}) = get_route(
-                                       &our_id, &payment_params, &network_graph.read_only(), None, 250_000_001, Arc::clone(&logger), &scorer, &(), &random_seed_bytes) {
+                                       &our_id, &payment_params, &network_graph.read_only(), None, 250_000_001, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes) {
                                assert_eq!(err, "Failed to find a sufficient route to the given destination");
                        } else { panic!(); }
                }
 
                {
                        // Now, attempt to route an exact amount we have should be fine.
-                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 250_000_000, Arc::clone(&logger), &scorer, &(),&random_seed_bytes).unwrap();
+                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 250_000_000, Arc::clone(&logger), &scorer, &Default::default(),&random_seed_bytes).unwrap();
                        assert_eq!(route.paths.len(), 1);
                        let path = route.paths.last().unwrap();
                        assert_eq!(path.hops.len(), 2);
@@ -3959,14 +4005,14 @@ mod tests {
                {
                        // Attempt to route more than available results in a failure.
                        if let Err(LightningError{err, action: ErrorAction::IgnoreError}) = get_route(
-                                       &our_id, &payment_params, &network_graph.read_only(), Some(&our_chans.iter().collect::<Vec<_>>()), 200_000_001, Arc::clone(&logger), &scorer, &(), &random_seed_bytes) {
+                                       &our_id, &payment_params, &network_graph.read_only(), Some(&our_chans.iter().collect::<Vec<_>>()), 200_000_001, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes) {
                                assert_eq!(err, "Failed to find a sufficient route to the given destination");
                        } else { panic!(); }
                }
 
                {
                        // Now, attempt to route an exact amount we have should be fine.
-                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), Some(&our_chans.iter().collect::<Vec<_>>()), 200_000_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), Some(&our_chans.iter().collect::<Vec<_>>()), 200_000_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                        assert_eq!(route.paths.len(), 1);
                        let path = route.paths.last().unwrap();
                        assert_eq!(path.hops.len(), 2);
@@ -4006,14 +4052,14 @@ mod tests {
                {
                        // Attempt to route more than available results in a failure.
                        if let Err(LightningError{err, action: ErrorAction::IgnoreError}) = get_route(
-                                       &our_id, &payment_params, &network_graph.read_only(), None, 15_001, Arc::clone(&logger), &scorer, &(), &random_seed_bytes) {
+                                       &our_id, &payment_params, &network_graph.read_only(), None, 15_001, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes) {
                                assert_eq!(err, "Failed to find a sufficient route to the given destination");
                        } else { panic!(); }
                }
 
                {
                        // Now, attempt to route an exact amount we have should be fine.
-                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 15_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 15_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                        assert_eq!(route.paths.len(), 1);
                        let path = route.paths.last().unwrap();
                        assert_eq!(path.hops.len(), 2);
@@ -4077,14 +4123,14 @@ mod tests {
                {
                        // Attempt to route more than available results in a failure.
                        if let Err(LightningError{err, action: ErrorAction::IgnoreError}) = get_route(
-                                       &our_id, &payment_params, &network_graph.read_only(), None, 15_001, Arc::clone(&logger), &scorer, &(), &random_seed_bytes) {
+                                       &our_id, &payment_params, &network_graph.read_only(), None, 15_001, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes) {
                                assert_eq!(err, "Failed to find a sufficient route to the given destination");
                        } else { panic!(); }
                }
 
                {
                        // Now, attempt to route an exact amount we have should be fine.
-                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 15_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 15_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                        assert_eq!(route.paths.len(), 1);
                        let path = route.paths.last().unwrap();
                        assert_eq!(path.hops.len(), 2);
@@ -4109,14 +4155,14 @@ mod tests {
                {
                        // Attempt to route more than available results in a failure.
                        if let Err(LightningError{err, action: ErrorAction::IgnoreError}) = get_route(
-                                       &our_id, &payment_params, &network_graph.read_only(), None, 10_001, Arc::clone(&logger), &scorer, &(), &random_seed_bytes) {
+                                       &our_id, &payment_params, &network_graph.read_only(), None, 10_001, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes) {
                                assert_eq!(err, "Failed to find a sufficient route to the given destination");
                        } else { panic!(); }
                }
 
                {
                        // Now, attempt to route an exact amount we have should be fine.
-                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 10_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 10_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                        assert_eq!(route.paths.len(), 1);
                        let path = route.paths.last().unwrap();
                        assert_eq!(path.hops.len(), 2);
@@ -4221,14 +4267,14 @@ mod tests {
                {
                        // Attempt to route more than available results in a failure.
                        if let Err(LightningError{err, action: ErrorAction::IgnoreError}) = get_route(
-                                       &our_id, &payment_params, &network_graph.read_only(), None, 60_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes) {
+                                       &our_id, &payment_params, &network_graph.read_only(), None, 60_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes) {
                                assert_eq!(err, "Failed to find a sufficient route to the given destination");
                        } else { panic!(); }
                }
 
                {
                        // Now, attempt to route 49 sats (just a bit below the capacity).
-                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 49_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 49_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                        assert_eq!(route.paths.len(), 1);
                        let mut total_amount_paid_msat = 0;
                        for path in &route.paths {
@@ -4241,7 +4287,7 @@ mod tests {
 
                {
                        // Attempt to route an exact amount is also fine
-                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 50_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 50_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                        assert_eq!(route.paths.len(), 1);
                        let mut total_amount_paid_msat = 0;
                        for path in &route.paths {
@@ -4289,7 +4335,7 @@ mod tests {
                });
 
                {
-                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 50_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 50_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                        assert_eq!(route.paths.len(), 1);
                        let mut total_amount_paid_msat = 0;
                        for path in &route.paths {
@@ -4456,7 +4502,7 @@ mod tests {
                        // Attempt to route more than available results in a failure.
                        if let Err(LightningError{err, action: ErrorAction::IgnoreError}) = get_route(
                                &our_id, &payment_params, &network_graph.read_only(), None, 300_000,
-                               Arc::clone(&logger), &scorer, &(), &random_seed_bytes) {
+                               Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes) {
                                        assert_eq!(err, "Failed to find a sufficient route to the given destination");
                        } else { panic!(); }
                }
@@ -4466,7 +4512,7 @@ mod tests {
                        let zero_payment_params = payment_params.clone().with_max_path_count(0);
                        if let Err(LightningError{err, action: ErrorAction::IgnoreError}) = get_route(
                                &our_id, &zero_payment_params, &network_graph.read_only(), None, 100,
-                               Arc::clone(&logger), &scorer, &(), &random_seed_bytes) {
+                               Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes) {
                                        assert_eq!(err, "Can't find a route with no paths allowed.");
                        } else { panic!(); }
                }
@@ -4478,7 +4524,7 @@ mod tests {
                        let fail_payment_params = payment_params.clone().with_max_path_count(3);
                        if let Err(LightningError{err, action: ErrorAction::IgnoreError}) = get_route(
                                &our_id, &fail_payment_params, &network_graph.read_only(), None, 250_000,
-                               Arc::clone(&logger), &scorer, &(), &random_seed_bytes) {
+                               Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes) {
                                        assert_eq!(err, "Failed to find a sufficient route to the given destination");
                        } else { panic!(); }
                }
@@ -4487,7 +4533,7 @@ mod tests {
                        // Now, attempt to route 250 sats (just a bit below the capacity).
                        // Our algorithm should provide us with these 3 paths.
                        let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None,
-                               250_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+                               250_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                        assert_eq!(route.paths.len(), 3);
                        let mut total_amount_paid_msat = 0;
                        for path in &route.paths {
@@ -4505,7 +4551,7 @@ mod tests {
                {
                        // Attempt to route an exact amount is also fine
                        let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None,
-                               290_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+                               290_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                        assert_eq!(route.paths.len(), 3);
                        let mut total_amount_paid_msat = 0;
                        for path in &route.paths {
@@ -4675,7 +4721,7 @@ mod tests {
                {
                        // Attempt to route more than available results in a failure.
                        if let Err(LightningError{err, action: ErrorAction::IgnoreError}) = get_route(
-                                       &our_id, &payment_params, &network_graph.read_only(), None, 350_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes) {
+                                       &our_id, &payment_params, &network_graph.read_only(), None, 350_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes) {
                                assert_eq!(err, "Failed to find a sufficient route to the given destination");
                        } else { panic!(); }
                }
@@ -4683,7 +4729,7 @@ mod tests {
                {
                        // Now, attempt to route 300 sats (exact amount we can route).
                        // Our algorithm should provide us with these 3 paths, 100 sats each.
-                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 300_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 300_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                        assert_eq!(route.paths.len(), 3);
 
                        let mut total_amount_paid_msat = 0;
@@ -4844,7 +4890,7 @@ mod tests {
                {
                        // Now, attempt to route 180 sats.
                        // Our algorithm should provide us with these 2 paths.
-                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 180_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 180_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                        assert_eq!(route.paths.len(), 2);
 
                        let mut total_value_transferred_msat = 0;
@@ -5015,14 +5061,14 @@ mod tests {
                {
                        // Attempt to route more than available results in a failure.
                        if let Err(LightningError{err, action: ErrorAction::IgnoreError}) = get_route(
-                                       &our_id, &payment_params, &network_graph.read_only(), None, 210_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes) {
+                                       &our_id, &payment_params, &network_graph.read_only(), None, 210_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes) {
                                assert_eq!(err, "Failed to find a sufficient route to the given destination");
                        } else { panic!(); }
                }
 
                {
                        // Now, attempt to route 200 sats (exact amount we can route).
-                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 200_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 200_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                        assert_eq!(route.paths.len(), 2);
 
                        let mut total_amount_paid_msat = 0;
@@ -5122,7 +5168,7 @@ mod tests {
 
                // Get a route for 100 sats and check that we found the MPP route no problem and didn't
                // overpay at all.
-               let mut route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+               let mut route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                assert_eq!(route.paths.len(), 2);
                route.paths.sort_by_key(|path| path.hops[0].short_channel_id);
                // Paths are manually ordered ordered by SCID, so:
@@ -5241,7 +5287,7 @@ mod tests {
                {
                        // Attempt to route more than available results in a failure.
                        if let Err(LightningError{err, action: ErrorAction::IgnoreError}) = get_route(
-                                       &our_id, &payment_params, &network_graph.read_only(), None, 150_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes) {
+                                       &our_id, &payment_params, &network_graph.read_only(), None, 150_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes) {
                                assert_eq!(err, "Failed to find a sufficient route to the given destination");
                        } else { panic!(); }
                }
@@ -5249,7 +5295,7 @@ mod tests {
                {
                        // Now, attempt to route 125 sats (just a bit below the capacity of 3 channels).
                        // Our algorithm should provide us with these 3 paths.
-                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 125_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 125_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                        assert_eq!(route.paths.len(), 3);
                        let mut total_amount_paid_msat = 0;
                        for path in &route.paths {
@@ -5262,7 +5308,7 @@ mod tests {
 
                {
                        // Attempt to route without the last small cheap channel
-                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 90_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 90_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                        assert_eq!(route.paths.len(), 2);
                        let mut total_amount_paid_msat = 0;
                        for path in &route.paths {
@@ -5401,7 +5447,7 @@ mod tests {
 
                {
                        // Now ensure the route flows simply over nodes 1 and 4 to 6.
-                       let route = get_route(&our_id, &payment_params, &network.read_only(), None, 10_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+                       let route = get_route(&our_id, &payment_params, &network.read_only(), None, 10_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                        assert_eq!(route.paths.len(), 1);
                        assert_eq!(route.paths[0].hops.len(), 3);
 
@@ -5472,7 +5518,7 @@ mod tests {
                {
                        // Now, attempt to route 90 sats, which is exactly 90 sats at the last hop, plus the
                        // 200% fee charged channel 13 in the 1-to-2 direction.
-                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 90_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 90_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                        assert_eq!(route.paths.len(), 1);
                        assert_eq!(route.paths[0].hops.len(), 2);
 
@@ -5538,7 +5584,7 @@ mod tests {
                        // Now, attempt to route 90 sats, hitting the htlc_minimum on channel 4, but
                        // overshooting the htlc_maximum on channel 2. Thus, we should pick the (absurdly
                        // expensive) channels 12-13 path.
-                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 90_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+                       let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 90_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                        assert_eq!(route.paths.len(), 1);
                        assert_eq!(route.paths[0].hops.len(), 2);
 
@@ -5580,7 +5626,7 @@ mod tests {
                        let route = get_route(&our_id, &payment_params, &network_graph.read_only(), Some(&[
                                &get_channel_details(Some(3), nodes[0], channelmanager::provided_init_features(&config), 200_000),
                                &get_channel_details(Some(2), nodes[0], channelmanager::provided_init_features(&config), 10_000),
-                       ]), 100_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+                       ]), 100_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                        assert_eq!(route.paths.len(), 1);
                        assert_eq!(route.paths[0].hops.len(), 1);
 
@@ -5592,7 +5638,7 @@ mod tests {
                        let route = get_route(&our_id, &payment_params, &network_graph.read_only(), Some(&[
                                &get_channel_details(Some(3), nodes[0], channelmanager::provided_init_features(&config), 50_000),
                                &get_channel_details(Some(2), nodes[0], channelmanager::provided_init_features(&config), 50_000),
-                       ]), 100_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+                       ]), 100_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                        assert_eq!(route.paths.len(), 2);
                        assert_eq!(route.paths[0].hops.len(), 1);
                        assert_eq!(route.paths[1].hops.len(), 1);
@@ -5624,7 +5670,7 @@ mod tests {
                                &get_channel_details(Some(8), nodes[0], channelmanager::provided_init_features(&config), 50_000),
                                &get_channel_details(Some(9), nodes[0], channelmanager::provided_init_features(&config), 50_000),
                                &get_channel_details(Some(4), nodes[0], channelmanager::provided_init_features(&config), 1_000_000),
-                       ]), 100_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+                       ]), 100_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                        assert_eq!(route.paths.len(), 1);
                        assert_eq!(route.paths[0].hops.len(), 1);
 
@@ -5646,7 +5692,7 @@ mod tests {
                let random_seed_bytes = keys_manager.get_secure_random_bytes();
                let route = get_route(
                        &our_id, &payment_params, &network_graph.read_only(), None, 100,
-                       Arc::clone(&logger), &scorer, &(), &random_seed_bytes
+                       Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes
                ).unwrap();
                let path = route.paths[0].hops.iter().map(|hop| hop.short_channel_id).collect::<Vec<_>>();
 
@@ -5659,7 +5705,7 @@ mod tests {
                let scorer = FixedPenaltyScorer::with_penalty(100);
                let route = get_route(
                        &our_id, &payment_params, &network_graph.read_only(), None, 100,
-                       Arc::clone(&logger), &scorer, &(), &random_seed_bytes
+                       Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes
                ).unwrap();
                let path = route.paths[0].hops.iter().map(|hop| hop.short_channel_id).collect::<Vec<_>>();
 
@@ -5677,8 +5723,9 @@ mod tests {
                fn write<W: Writer>(&self, _w: &mut W) -> Result<(), crate::io::Error> { unimplemented!() }
        }
        impl Score for BadChannelScorer {
+               #[cfg(not(c_bindings))]
                type ScoreParams = ();
-               fn channel_penalty_msat(&self, short_channel_id: u64, _: &NodeId, _: &NodeId, _: ChannelUsage, _score_params:&Self::ScoreParams) -> u64 {
+               fn channel_penalty_msat(&self, short_channel_id: u64, _: &NodeId, _: &NodeId, _: ChannelUsage, _score_params: &crate::routing::scoring::ProbabilisticScoringFeeParameters) -> u64 {
                        if short_channel_id == self.short_channel_id { u64::max_value() } else { 0 }
                }
 
@@ -5698,8 +5745,9 @@ mod tests {
        }
 
        impl Score for BadNodeScorer {
+               #[cfg(not(c_bindings))]
                type ScoreParams = ();
-               fn channel_penalty_msat(&self, _: u64, _: &NodeId, target: &NodeId, _: ChannelUsage, _score_params:&Self::ScoreParams) -> u64 {
+               fn channel_penalty_msat(&self, _: u64, _: &NodeId, target: &NodeId, _: ChannelUsage, _score_params: &crate::routing::scoring::ProbabilisticScoringFeeParameters) -> u64 {
                        if *target == self.node_id { u64::max_value() } else { 0 }
                }
 
@@ -5722,7 +5770,7 @@ mod tests {
                let random_seed_bytes = keys_manager.get_secure_random_bytes();
                let route = get_route(
                        &our_id, &payment_params, &network_graph, None, 100,
-                       Arc::clone(&logger), &scorer, &(), &random_seed_bytes
+                       Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes
                ).unwrap();
                let path = route.paths[0].hops.iter().map(|hop| hop.short_channel_id).collect::<Vec<_>>();
 
@@ -5734,7 +5782,7 @@ mod tests {
                let scorer = BadChannelScorer { short_channel_id: 6 };
                let route = get_route(
                        &our_id, &payment_params, &network_graph, None, 100,
-                       Arc::clone(&logger), &scorer, &(), &random_seed_bytes
+                       Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes
                ).unwrap();
                let path = route.paths[0].hops.iter().map(|hop| hop.short_channel_id).collect::<Vec<_>>();
 
@@ -5746,7 +5794,7 @@ mod tests {
                let scorer = BadNodeScorer { node_id: NodeId::from_pubkey(&nodes[2]) };
                match get_route(
                        &our_id, &payment_params, &network_graph, None, 100,
-                       Arc::clone(&logger), &scorer, &(), &random_seed_bytes
+                       Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes
                ) {
                        Err(LightningError { err, .. } ) => {
                                assert_eq!(err, "Failed to find a path to the given destination");
@@ -5840,7 +5888,7 @@ mod tests {
                        .with_max_total_cltv_expiry_delta(feasible_max_total_cltv_delta);
                let keys_manager = ln_test_utils::TestKeysInterface::new(&[0u8; 32], Network::Testnet);
                let random_seed_bytes = keys_manager.get_secure_random_bytes();
-               let route = get_route(&our_id, &feasible_payment_params, &network_graph, None, 100, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+               let route = get_route(&our_id, &feasible_payment_params, &network_graph, None, 100, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                let path = route.paths[0].hops.iter().map(|hop| hop.short_channel_id).collect::<Vec<_>>();
                assert_ne!(path.len(), 0);
 
@@ -5848,7 +5896,7 @@ mod tests {
                let fail_max_total_cltv_delta = 23;
                let fail_payment_params = PaymentParameters::from_node_id(nodes[6], 0).with_route_hints(last_hops(&nodes)).unwrap()
                        .with_max_total_cltv_expiry_delta(fail_max_total_cltv_delta);
-               match get_route(&our_id, &fail_payment_params, &network_graph, None, 100, Arc::clone(&logger), &scorer, &(), &random_seed_bytes)
+               match get_route(&our_id, &fail_payment_params, &network_graph, None, 100, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes)
                {
                        Err(LightningError { err, .. } ) => {
                                assert_eq!(err, "Failed to find a path to the given destination");
@@ -5873,9 +5921,9 @@ mod tests {
 
                // We should be able to find a route initially, and then after we fail a few random
                // channels eventually we won't be able to any longer.
-               assert!(get_route(&our_id, &payment_params, &network_graph, None, 100, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).is_ok());
+               assert!(get_route(&our_id, &payment_params, &network_graph, None, 100, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).is_ok());
                loop {
-                       if let Ok(route) = get_route(&our_id, &payment_params, &network_graph, None, 100, Arc::clone(&logger), &scorer, &(), &random_seed_bytes) {
+                       if let Ok(route) = get_route(&our_id, &payment_params, &network_graph, None, 100, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes) {
                                for chan in route.paths[0].hops.iter() {
                                        assert!(!payment_params.previously_failed_channels.contains(&chan.short_channel_id));
                                }
@@ -5899,14 +5947,14 @@ mod tests {
                // First check we can actually create a long route on this graph.
                let feasible_payment_params = PaymentParameters::from_node_id(nodes[18], 0);
                let route = get_route(&our_id, &feasible_payment_params, &network_graph, None, 100,
-                       Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+                       Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                let path = route.paths[0].hops.iter().map(|hop| hop.short_channel_id).collect::<Vec<_>>();
                assert!(path.len() == MAX_PATH_LENGTH_ESTIMATE.into());
 
                // But we can't create a path surpassing the MAX_PATH_LENGTH_ESTIMATE limit.
                let fail_payment_params = PaymentParameters::from_node_id(nodes[19], 0);
                match get_route(&our_id, &fail_payment_params, &network_graph, None, 100,
-                       Arc::clone(&logger), &scorer, &(), &random_seed_bytes)
+                       Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes)
                {
                        Err(LightningError { err, .. } ) => {
                                assert_eq!(err, "Failed to find a path to the given destination");
@@ -5925,7 +5973,7 @@ mod tests {
                let payment_params = PaymentParameters::from_node_id(nodes[6], 42).with_route_hints(last_hops(&nodes)).unwrap();
                let keys_manager = ln_test_utils::TestKeysInterface::new(&[0u8; 32], Network::Testnet);
                let random_seed_bytes = keys_manager.get_secure_random_bytes();
-               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+               let route = get_route(&our_id, &payment_params, &network_graph.read_only(), None, 100, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                assert_eq!(route.paths.len(), 1);
 
                let cltv_expiry_deltas_before = route.paths[0].hops.iter().map(|h| h.cltv_expiry_delta).collect::<Vec<u32>>();
@@ -5960,7 +6008,7 @@ mod tests {
                let random_seed_bytes = keys_manager.get_secure_random_bytes();
 
                let mut route = get_route(&our_id, &payment_params, &network_graph, None, 100,
-                                                                 Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+                                                                 Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                add_random_cltv_offset(&mut route, &payment_params, &network_graph, &random_seed_bytes);
 
                let mut path_plausibility = vec![];
@@ -6219,7 +6267,7 @@ mod tests {
                // Make sure we'll error if our route hints don't have enough liquidity according to their
                // htlc_maximum_msat.
                if let Err(LightningError{err, action: ErrorAction::IgnoreError}) = get_route(&our_id,
-                       &payment_params, &netgraph, None, max_htlc_msat + 1, Arc::clone(&logger), &scorer, &(),
+                       &payment_params, &netgraph, None, max_htlc_msat + 1, Arc::clone(&logger), &scorer, &Default::default(),
                        &random_seed_bytes)
                {
                        assert_eq!(err, "Failed to find a sufficient route to the given destination");
@@ -6232,7 +6280,7 @@ mod tests {
                        .with_route_hints(vec![route_hint_1, route_hint_2]).unwrap()
                        .with_bolt11_features(channelmanager::provided_invoice_features(&config)).unwrap();
                let route = get_route(&our_id, &payment_params, &netgraph, None, max_htlc_msat + 1,
-                       Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+                       Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                assert_eq!(route.paths.len(), 2);
                assert!(route.paths[0].hops.last().unwrap().fee_msat <= max_htlc_msat);
                assert!(route.paths[1].hops.last().unwrap().fee_msat <= max_htlc_msat);
@@ -6286,7 +6334,7 @@ mod tests {
                        .with_bolt11_features(channelmanager::provided_invoice_features(&config)).unwrap();
 
                let route = get_route(&our_node_id, &payment_params, &network_graph.read_only(),
-                       Some(&first_hop.iter().collect::<Vec<_>>()), amt_msat, Arc::clone(&logger), &scorer, &(),
+                       Some(&first_hop.iter().collect::<Vec<_>>()), amt_msat, Arc::clone(&logger), &scorer, &Default::default(),
                        &random_seed_bytes).unwrap();
                assert_eq!(route.paths.len(), 2);
                assert!(route.paths[0].hops.last().unwrap().fee_msat <= max_htlc_msat);
@@ -6300,7 +6348,7 @@ mod tests {
                        get_channel_details(Some(43), intermed_node_id, InitFeatures::from_le_bytes(vec![0b11]), amt_msat - 10),
                ];
                let route = get_route(&our_node_id, &payment_params, &network_graph.read_only(),
-                       Some(&first_hops.iter().collect::<Vec<_>>()), amt_msat, Arc::clone(&logger), &scorer, &(),
+                       Some(&first_hops.iter().collect::<Vec<_>>()), amt_msat, Arc::clone(&logger), &scorer, &Default::default(),
                        &random_seed_bytes).unwrap();
                assert_eq!(route.paths.len(), 2);
                assert!(route.paths[0].hops.last().unwrap().fee_msat <= max_htlc_msat);
@@ -6330,7 +6378,7 @@ mod tests {
                        (blinded_payinfo.clone(), blinded_path.clone())])
                        .with_bolt12_features(bolt12_features).unwrap();
                let route = get_route(&our_node_id, &payment_params, &network_graph.read_only(),
-                       Some(&first_hops.iter().collect::<Vec<_>>()), amt_msat, Arc::clone(&logger), &scorer, &(),
+                       Some(&first_hops.iter().collect::<Vec<_>>()), amt_msat, Arc::clone(&logger), &scorer, &Default::default(),
                        &random_seed_bytes).unwrap();
                assert_eq!(route.paths.len(), 2);
                assert!(route.paths[0].hops.last().unwrap().fee_msat <= max_htlc_msat);
@@ -6522,7 +6570,7 @@ mod tests {
                let final_amt_msat = 1001;
                let payment_params = PaymentParameters::blinded(vec![(blinded_payinfo.clone(), blinded_path.clone())]);
                let route = get_route(&our_id, &payment_params, &network_graph, None, final_amt_msat , Arc::clone(&logger),
-                       &scorer, &(), &random_seed_bytes).unwrap();
+                       &scorer, &Default::default(), &random_seed_bytes).unwrap();
                assert_eq!(route.paths.len(), 1);
                assert_eq!(route.paths[0].hops.len(), 2);
 
@@ -6576,7 +6624,7 @@ mod tests {
                        (blinded_payinfo.clone(), invalid_blinded_path.clone()),
                        (blinded_payinfo.clone(), invalid_blinded_path_2)]);
                match get_route(&our_id, &payment_params, &network_graph, None, 1001, Arc::clone(&logger),
-                       &scorer, &(), &random_seed_bytes)
+                       &scorer, &Default::default(), &random_seed_bytes)
                {
                        Err(LightningError { err, .. }) => {
                                assert_eq!(err, "1-hop blinded paths must all have matching introduction node ids");
@@ -6587,7 +6635,7 @@ mod tests {
                invalid_blinded_path.introduction_node_id = our_id;
                let payment_params = PaymentParameters::blinded(vec![(blinded_payinfo.clone(), invalid_blinded_path.clone())]);
                match get_route(&our_id, &payment_params, &network_graph, None, 1001, Arc::clone(&logger),
-                       &scorer, &(), &random_seed_bytes)
+                       &scorer, &Default::default(), &random_seed_bytes)
                {
                        Err(LightningError { err, .. }) => {
                                assert_eq!(err, "Cannot generate a route to blinded paths if we are the introduction node to all of them");
@@ -6599,7 +6647,7 @@ mod tests {
                invalid_blinded_path.blinded_hops.clear();
                let payment_params = PaymentParameters::blinded(vec![(blinded_payinfo, invalid_blinded_path)]);
                match get_route(&our_id, &payment_params, &network_graph, None, 1001, Arc::clone(&logger),
-                       &scorer, &(), &random_seed_bytes)
+                       &scorer, &Default::default(), &random_seed_bytes)
                {
                        Err(LightningError { err, .. }) => {
                                assert_eq!(err, "0-hop blinded path provided");
@@ -6652,7 +6700,7 @@ mod tests {
                        .with_bolt12_features(bolt12_features.clone()).unwrap();
 
                let route = get_route(&our_id, &payment_params, &network_graph, None,
-                       100_000, Arc::clone(&logger), &scorer, &(), &random_seed_bytes).unwrap();
+                       100_000, Arc::clone(&logger), &scorer, &Default::default(), &random_seed_bytes).unwrap();
                assert_eq!(route.paths.len(), 2);
                let mut total_amount_paid_msat = 0;
                for path in route.paths.into_iter() {
@@ -6771,7 +6819,7 @@ pub(crate) mod bench_utils {
        }
 
        pub(crate) fn generate_test_routes<S: Score>(graph: &NetworkGraph<&TestLogger>, scorer: &mut S,
-               score_params: &S::ScoreParams, features: Bolt11InvoiceFeatures, mut seed: u64,
+               score_params: &crate::routing::scoring::ProbabilisticScoringFeeParameters, features: Bolt11InvoiceFeatures, mut seed: u64,
                starting_amount: u64, route_count: usize,
        ) -> Vec<(ChannelDetails, PaymentParameters, u64)> {
                let payer = payer_pubkey();
@@ -6914,7 +6962,7 @@ pub mod benches {
 
        fn generate_routes<S: Score>(
                bench: &mut Criterion, graph: &NetworkGraph<&TestLogger>, mut scorer: S,
-               score_params: &S::ScoreParams, features: Bolt11InvoiceFeatures, starting_amount: u64,
+               score_params: &crate::routing::scoring::ProbabilisticScoringFeeParameters, features: Bolt11InvoiceFeatures, starting_amount: u64,
                bench_name: &'static str,
        ) {
                let payer = bench_utils::payer_pubkey();