1 // This file is Copyright its original authors, visible in version control
4 // This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
5 // or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
6 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
7 // You may not use this file except in accordance with one or both of these
10 //! Utilities for scoring payment channels.
12 //! [`ProbabilisticScorer`] may be given to [`find_route`] to score payment channels during path
13 //! finding when a custom [`Score`] implementation is not needed.
18 //! # extern crate secp256k1;
20 //! # use lightning::routing::network_graph::NetworkGraph;
21 //! # use lightning::routing::router::{RouteParameters, find_route};
22 //! # use lightning::routing::scoring::{ProbabilisticScorer, ProbabilisticScoringParameters, Scorer, ScoringParameters};
23 //! # use lightning::util::logger::{Logger, Record};
24 //! # use secp256k1::key::PublicKey;
26 //! # struct FakeLogger {};
27 //! # impl Logger for FakeLogger {
28 //! # fn log(&self, record: &Record) { unimplemented!() }
30 //! # fn find_scored_route(payer: PublicKey, route_params: RouteParameters, network_graph: NetworkGraph) {
31 //! # let logger = FakeLogger {};
33 //! // Use the default channel penalties.
34 //! let params = ProbabilisticScoringParameters::default();
35 //! let scorer = ProbabilisticScorer::new(params, &payer, &network_graph);
37 //! // Or use custom channel penalties.
38 //! let params = ProbabilisticScoringParameters {
39 //! liquidity_penalty_multiplier_msat: 2 * 1000,
40 //! ..ProbabilisticScoringParameters::default()
42 //! let scorer = ProbabilisticScorer::new(params, &payer, &network_graph);
44 //! let route = find_route(&payer, &route_params, &network_graph, None, &logger, &scorer);
50 //! Persisting when built with feature `no-std` and restoring without it, or vice versa, uses
51 //! different types and thus is undefined.
53 //! [`find_route`]: crate::routing::router::find_route
55 use bitcoin::secp256k1::key::PublicKey;
57 use ln::msgs::DecodeError;
58 use routing::network_graph::{EffectiveCapacity, NetworkGraph, NodeId};
59 use routing::router::RouteHop;
60 use util::ser::{Readable, ReadableArgs, Writeable, Writer};
63 use core::cell::{RefCell, RefMut};
64 use core::ops::{Deref, DerefMut};
65 use core::time::Duration;
67 use sync::{Mutex, MutexGuard};
69 /// We define Score ever-so-slightly differently based on whether we are being built for C bindings
70 /// or not. For users, `LockableScore` must somehow be writeable to disk. For Rust users, this is
71 /// no problem - you move a `Score` that implements `Writeable` into a `Mutex`, lock it, and now
72 /// you have the original, concrete, `Score` type, which presumably implements `Writeable`.
74 /// For C users, once you've moved the `Score` into a `LockableScore` all you have after locking it
75 /// is an opaque trait object with an opaque pointer with no type info. Users could take the unsafe
76 /// approach of blindly casting that opaque pointer to a concrete type and calling `Writeable` from
77 /// there, but other languages downstream of the C bindings (e.g. Java) can't even do that.
78 /// Instead, we really want `Score` and `LockableScore` to implement `Writeable` directly, which we
79 /// do here by defining `Score` differently for `cfg(c_bindings)`.
80 macro_rules! define_score { ($($supertrait: path)*) => {
81 /// An interface used to score payment channels for path finding.
83 /// Scoring is in terms of fees willing to be paid in order to avoid routing through a channel.
84 pub trait Score $(: $supertrait)* {
85 /// Returns the fee in msats willing to be paid to avoid routing `send_amt_msat` through the
86 /// given channel in the direction from `source` to `target`.
88 /// The channel's capacity (less any other MPP parts that are also being considered for use in
89 /// the same payment) is given by `capacity_msat`. It may be determined from various sources
90 /// such as a chain data, network gossip, or invoice hints. For invoice hints, a capacity near
91 /// [`u64::max_value`] is given to indicate sufficient capacity for the invoice's full amount.
92 /// Thus, implementations should be overflow-safe.
93 fn channel_penalty_msat(&self, short_channel_id: u64, send_amt_msat: u64, capacity_msat: u64, source: &NodeId, target: &NodeId) -> u64;
95 /// Handles updating channel penalties after failing to route through a channel.
96 fn payment_path_failed(&mut self, path: &[&RouteHop], short_channel_id: u64);
98 /// Handles updating channel penalties after successfully routing along a path.
99 fn payment_path_successful(&mut self, path: &[&RouteHop]);
102 impl<S: Score, T: DerefMut<Target=S> $(+ $supertrait)*> Score for T {
103 fn channel_penalty_msat(&self, short_channel_id: u64, send_amt_msat: u64, capacity_msat: u64, source: &NodeId, target: &NodeId) -> u64 {
104 self.deref().channel_penalty_msat(short_channel_id, send_amt_msat, capacity_msat, source, target)
107 fn payment_path_failed(&mut self, path: &[&RouteHop], short_channel_id: u64) {
108 self.deref_mut().payment_path_failed(path, short_channel_id)
111 fn payment_path_successful(&mut self, path: &[&RouteHop]) {
112 self.deref_mut().payment_path_successful(path)
118 define_score!(Writeable);
119 #[cfg(not(c_bindings))]
122 /// A scorer that is accessed under a lock.
124 /// Needed so that calls to [`Score::channel_penalty_msat`] in [`find_route`] can be made while
125 /// having shared ownership of a scorer but without requiring internal locking in [`Score`]
126 /// implementations. Internal locking would be detrimental to route finding performance and could
127 /// result in [`Score::channel_penalty_msat`] returning a different value for the same channel.
129 /// [`find_route`]: crate::routing::router::find_route
130 pub trait LockableScore<'a> {
131 /// The locked [`Score`] type.
132 type Locked: 'a + Score;
134 /// Returns the locked scorer.
135 fn lock(&'a self) -> Self::Locked;
139 impl<'a, T: 'a + Score> LockableScore<'a> for Mutex<T> {
140 type Locked = MutexGuard<'a, T>;
142 fn lock(&'a self) -> MutexGuard<'a, T> {
143 Mutex::lock(self).unwrap()
147 impl<'a, T: 'a + Score> LockableScore<'a> for RefCell<T> {
148 type Locked = RefMut<'a, T>;
150 fn lock(&'a self) -> RefMut<'a, T> {
156 /// A concrete implementation of [`LockableScore`] which supports multi-threading.
157 pub struct MultiThreadedLockableScore<S: Score> {
162 impl<'a, T: Score + 'a> LockableScore<'a> for MultiThreadedLockableScore<T> {
163 type Locked = MutexGuard<'a, T>;
165 fn lock(&'a self) -> MutexGuard<'a, T> {
166 Mutex::lock(&self.score).unwrap()
171 impl<T: Score> MultiThreadedLockableScore<T> {
172 /// Creates a new [`MultiThreadedLockableScore`] given an underlying [`Score`].
173 pub fn new(score: T) -> Self {
174 MultiThreadedLockableScore { score: Mutex::new(score) }
180 impl<'a, T: Writeable> Writeable for RefMut<'a, T> {
181 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
182 T::write(&**self, writer)
188 impl<'a, S: Writeable> Writeable for MutexGuard<'a, S> {
189 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
190 S::write(&**self, writer)
194 /// [`Score`] implementation that provides reasonable default behavior.
196 /// Used to apply a fixed penalty to each channel, thus avoiding long paths when shorter paths with
197 /// slightly higher fees are available. Will further penalize channels that fail to relay payments.
199 /// See [module-level documentation] for usage.
201 /// [module-level documentation]: crate::routing::scoring
202 #[cfg(not(feature = "no-std"))]
203 pub type Scorer = ScorerUsingTime::<std::time::Instant>;
204 /// [`Score`] implementation that provides reasonable default behavior.
206 /// Used to apply a fixed penalty to each channel, thus avoiding long paths when shorter paths with
207 /// slightly higher fees are available. Will further penalize channels that fail to relay payments.
209 /// See [module-level documentation] for usage and [`ScoringParameters`] for customization.
211 /// [module-level documentation]: crate::routing::scoring
212 #[cfg(feature = "no-std")]
213 pub type Scorer = ScorerUsingTime::<time::Eternity>;
215 // Note that ideally we'd hide ScorerUsingTime from public view by sealing it as well, but rustdoc
216 // doesn't handle this well - instead exposing a `Scorer` which has no trait implementation(s) or
219 /// [`Score`] implementation.
221 /// See [`Scorer`] for details.
225 /// Mixing the `no-std` feature between serialization and deserialization results in undefined
228 /// (C-not exported) generally all users should use the [`Scorer`] type alias.
229 pub struct ScorerUsingTime<T: Time> {
230 params: ScoringParameters,
231 // TODO: Remove entries of closed channels.
232 channel_failures: HashMap<u64, ChannelFailure<T>>,
235 /// Parameters for configuring [`Scorer`].
236 pub struct ScoringParameters {
237 /// A fixed penalty in msats to apply to each channel.
239 /// Default value: 500 msat
240 pub base_penalty_msat: u64,
242 /// A penalty in msats to apply to a channel upon failing to relay a payment.
244 /// This accumulates for each failure but may be reduced over time based on
245 /// [`failure_penalty_half_life`] or when successfully routing through a channel.
247 /// Default value: 1,024,000 msat
249 /// [`failure_penalty_half_life`]: Self::failure_penalty_half_life
250 pub failure_penalty_msat: u64,
252 /// When the amount being sent over a channel is this many 1024ths of the total channel
253 /// capacity, we begin applying [`overuse_penalty_msat_per_1024th`].
255 /// Default value: 128 1024ths (i.e. begin penalizing when an HTLC uses 1/8th of a channel)
257 /// [`overuse_penalty_msat_per_1024th`]: Self::overuse_penalty_msat_per_1024th
258 pub overuse_penalty_start_1024th: u16,
260 /// A penalty applied, per whole 1024ths of the channel capacity which the amount being sent
261 /// over the channel exceeds [`overuse_penalty_start_1024th`] by.
263 /// Default value: 20 msat (i.e. 2560 msat penalty to use 1/4th of a channel, 7680 msat penalty
264 /// to use half a channel, and 12,560 msat penalty to use 3/4ths of a channel)
266 /// [`overuse_penalty_start_1024th`]: Self::overuse_penalty_start_1024th
267 pub overuse_penalty_msat_per_1024th: u64,
269 /// The time required to elapse before any accumulated [`failure_penalty_msat`] penalties are
272 /// Successfully routing through a channel will immediately cut the penalty in half as well.
276 /// When built with the `no-std` feature, time will never elapse. Therefore, this penalty will
279 /// [`failure_penalty_msat`]: Self::failure_penalty_msat
280 pub failure_penalty_half_life: Duration,
283 impl_writeable_tlv_based!(ScoringParameters, {
284 (0, base_penalty_msat, required),
285 (1, overuse_penalty_start_1024th, (default_value, 128)),
286 (2, failure_penalty_msat, required),
287 (3, overuse_penalty_msat_per_1024th, (default_value, 20)),
288 (4, failure_penalty_half_life, required),
291 /// Accounting for penalties against a channel for failing to relay any payments.
293 /// Penalties decay over time, though accumulate as more failures occur.
294 struct ChannelFailure<T: Time> {
295 /// Accumulated penalty in msats for the channel as of `last_updated`.
296 undecayed_penalty_msat: u64,
298 /// Last time the channel either failed to route or successfully routed a payment. Used to decay
299 /// `undecayed_penalty_msat`.
303 impl<T: Time> ScorerUsingTime<T> {
304 /// Creates a new scorer using the given scoring parameters.
305 pub fn new(params: ScoringParameters) -> Self {
308 channel_failures: HashMap::new(),
312 /// Creates a new scorer using `penalty_msat` as a fixed channel penalty.
313 #[cfg(any(test, feature = "fuzztarget", feature = "_test_utils"))]
314 pub fn with_fixed_penalty(penalty_msat: u64) -> Self {
315 Self::new(ScoringParameters {
316 base_penalty_msat: penalty_msat,
317 failure_penalty_msat: 0,
318 failure_penalty_half_life: Duration::from_secs(0),
319 overuse_penalty_start_1024th: 1024,
320 overuse_penalty_msat_per_1024th: 0,
325 impl<T: Time> ChannelFailure<T> {
326 fn new(failure_penalty_msat: u64) -> Self {
328 undecayed_penalty_msat: failure_penalty_msat,
329 last_updated: T::now(),
333 fn add_penalty(&mut self, failure_penalty_msat: u64, half_life: Duration) {
334 self.undecayed_penalty_msat = self.decayed_penalty_msat(half_life) + failure_penalty_msat;
335 self.last_updated = T::now();
338 fn reduce_penalty(&mut self, half_life: Duration) {
339 self.undecayed_penalty_msat = self.decayed_penalty_msat(half_life) >> 1;
340 self.last_updated = T::now();
343 fn decayed_penalty_msat(&self, half_life: Duration) -> u64 {
344 self.last_updated.elapsed().as_secs()
345 .checked_div(half_life.as_secs())
346 .and_then(|decays| self.undecayed_penalty_msat.checked_shr(decays as u32))
351 impl<T: Time> Default for ScorerUsingTime<T> {
352 fn default() -> Self {
353 Self::new(ScoringParameters::default())
357 impl Default for ScoringParameters {
358 fn default() -> Self {
360 base_penalty_msat: 500,
361 failure_penalty_msat: 1024 * 1000,
362 failure_penalty_half_life: Duration::from_secs(3600),
363 overuse_penalty_start_1024th: 1024 / 8,
364 overuse_penalty_msat_per_1024th: 20,
369 impl<T: Time> Score for ScorerUsingTime<T> {
370 fn channel_penalty_msat(
371 &self, short_channel_id: u64, send_amt_msat: u64, capacity_msat: u64, _source: &NodeId, _target: &NodeId
373 let failure_penalty_msat = self.channel_failures
374 .get(&short_channel_id)
375 .map_or(0, |value| value.decayed_penalty_msat(self.params.failure_penalty_half_life));
377 let mut penalty_msat = self.params.base_penalty_msat + failure_penalty_msat;
378 let send_1024ths = send_amt_msat.checked_mul(1024).unwrap_or(u64::max_value()) / capacity_msat;
379 if send_1024ths > self.params.overuse_penalty_start_1024th as u64 {
380 penalty_msat = penalty_msat.checked_add(
381 (send_1024ths - self.params.overuse_penalty_start_1024th as u64)
382 .checked_mul(self.params.overuse_penalty_msat_per_1024th).unwrap_or(u64::max_value()))
383 .unwrap_or(u64::max_value());
389 fn payment_path_failed(&mut self, _path: &[&RouteHop], short_channel_id: u64) {
390 let failure_penalty_msat = self.params.failure_penalty_msat;
391 let half_life = self.params.failure_penalty_half_life;
392 self.channel_failures
393 .entry(short_channel_id)
394 .and_modify(|failure| failure.add_penalty(failure_penalty_msat, half_life))
395 .or_insert_with(|| ChannelFailure::new(failure_penalty_msat));
398 fn payment_path_successful(&mut self, path: &[&RouteHop]) {
399 let half_life = self.params.failure_penalty_half_life;
400 for hop in path.iter() {
401 self.channel_failures
402 .entry(hop.short_channel_id)
403 .and_modify(|failure| failure.reduce_penalty(half_life));
408 impl<T: Time> Writeable for ScorerUsingTime<T> {
410 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
411 self.params.write(w)?;
412 self.channel_failures.write(w)?;
413 write_tlv_fields!(w, {});
418 impl<T: Time> Readable for ScorerUsingTime<T> {
420 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
422 params: Readable::read(r)?,
423 channel_failures: Readable::read(r)?,
425 read_tlv_fields!(r, {});
430 impl<T: Time> Writeable for ChannelFailure<T> {
432 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
433 let duration_since_epoch = T::duration_since_epoch() - self.last_updated.elapsed();
434 write_tlv_fields!(w, {
435 (0, self.undecayed_penalty_msat, required),
436 (2, duration_since_epoch, required),
442 impl<T: Time> Readable for ChannelFailure<T> {
444 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
445 let mut undecayed_penalty_msat = 0;
446 let mut duration_since_epoch = Duration::from_secs(0);
447 read_tlv_fields!(r, {
448 (0, undecayed_penalty_msat, required),
449 (2, duration_since_epoch, required),
452 undecayed_penalty_msat,
453 last_updated: T::now() - (T::duration_since_epoch() - duration_since_epoch),
458 /// [`Score`] implementation using channel success probability distributions.
460 /// Based on *Optimally Reliable & Cheap Payment Flows on the Lightning Network* by Rene Pickhardt
461 /// and Stefan Richter [[1]]. Given the uncertainty of channel liquidity balances, probability
462 /// distributions are defined based on knowledge learned from successful and unsuccessful attempts.
463 /// Then the negative log of the success probability is used to determine the cost of routing a
464 /// specific HTLC amount through a channel.
466 /// [1]: https://arxiv.org/abs/2107.05322
467 pub struct ProbabilisticScorer<G: Deref<Target = NetworkGraph>> {
468 params: ProbabilisticScoringParameters,
471 // TODO: Remove entries of closed channels.
472 channel_liquidities: HashMap<u64, ChannelLiquidity>,
475 /// Parameters for configuring [`ProbabilisticScorer`].
476 pub struct ProbabilisticScoringParameters {
477 /// A penalty applied after multiplying by the negative log of the channel's success probability
480 /// The success probability is determined by the effective channel capacity, the payment amount,
481 /// and knowledge learned from prior successful and unsuccessful payments. The lower bound of
482 /// the success probability is 0.01, effectively limiting the penalty to the range
483 /// `0..=2*liquidity_penalty_multiplier_msat`.
485 /// Default value: 1,000 msat
486 pub liquidity_penalty_multiplier_msat: u64,
489 impl_writeable_tlv_based!(ProbabilisticScoringParameters, {
490 (0, liquidity_penalty_multiplier_msat, required),
493 /// Accounting for channel liquidity balance uncertainty.
495 /// Direction is defined in terms of [`NodeId`] partial ordering, where the source node is the
496 /// first node in the ordering of the channel's counterparties. Thus, swapping the two liquidity
497 /// offset fields gives the opposite direction.
498 struct ChannelLiquidity {
499 min_liquidity_offset_msat: u64,
500 max_liquidity_offset_msat: u64,
503 /// A view of [`ChannelLiquidity`] in one direction assuming a certain channel capacity.
504 struct DirectedChannelLiquidity<L: Deref<Target = u64>> {
505 min_liquidity_offset_msat: L,
506 max_liquidity_offset_msat: L,
510 impl<G: Deref<Target = NetworkGraph>> ProbabilisticScorer<G> {
511 /// Creates a new scorer using the given scoring parameters for sending payments from a node
512 /// through a network graph.
514 params: ProbabilisticScoringParameters, node_pubkey: &PublicKey, network_graph: G
518 node_id: NodeId::from_pubkey(node_pubkey),
520 channel_liquidities: HashMap::new(),
525 fn with_channel(mut self, short_channel_id: u64, liquidity: ChannelLiquidity) -> Self {
526 assert!(self.channel_liquidities.insert(short_channel_id, liquidity).is_none());
531 impl Default for ProbabilisticScoringParameters {
532 fn default() -> Self {
534 liquidity_penalty_multiplier_msat: 1000,
539 impl ChannelLiquidity {
543 min_liquidity_offset_msat: 0,
544 max_liquidity_offset_msat: 0,
548 /// Returns a view of the channel liquidity directed from `source` to `target` assuming
551 &self, source: &NodeId, target: &NodeId, capacity_msat: u64
552 ) -> DirectedChannelLiquidity<&u64> {
553 let (min_liquidity_offset_msat, max_liquidity_offset_msat) = if source < target {
554 (&self.min_liquidity_offset_msat, &self.max_liquidity_offset_msat)
556 (&self.max_liquidity_offset_msat, &self.min_liquidity_offset_msat)
559 DirectedChannelLiquidity {
560 min_liquidity_offset_msat,
561 max_liquidity_offset_msat,
566 /// Returns a mutable view of the channel liquidity directed from `source` to `target` assuming
569 &mut self, source: &NodeId, target: &NodeId, capacity_msat: u64
570 ) -> DirectedChannelLiquidity<&mut u64> {
571 let (min_liquidity_offset_msat, max_liquidity_offset_msat) = if source < target {
572 (&mut self.min_liquidity_offset_msat, &mut self.max_liquidity_offset_msat)
574 (&mut self.max_liquidity_offset_msat, &mut self.min_liquidity_offset_msat)
577 DirectedChannelLiquidity {
578 min_liquidity_offset_msat,
579 max_liquidity_offset_msat,
585 impl<L: Deref<Target = u64>> DirectedChannelLiquidity<L> {
586 /// Returns the success probability of routing the given HTLC `amount_msat` through the channel
587 /// in this direction.
588 fn success_probability(&self, amount_msat: u64) -> f64 {
589 let max_liquidity_msat = self.max_liquidity_msat();
590 let min_liquidity_msat = core::cmp::min(self.min_liquidity_msat(), max_liquidity_msat);
591 if amount_msat > max_liquidity_msat {
593 } else if amount_msat <= min_liquidity_msat {
596 let numerator = max_liquidity_msat + 1 - amount_msat;
597 let denominator = max_liquidity_msat + 1 - min_liquidity_msat;
598 numerator as f64 / denominator as f64
599 }.max(0.01) // Lower bound the success probability to ensure some channel is selected.
602 /// Returns the lower bound of the channel liquidity balance in this direction.
603 fn min_liquidity_msat(&self) -> u64 {
604 *self.min_liquidity_offset_msat
607 /// Returns the upper bound of the channel liquidity balance in this direction.
608 fn max_liquidity_msat(&self) -> u64 {
609 self.capacity_msat.checked_sub(*self.max_liquidity_offset_msat).unwrap_or(0)
613 impl<L: DerefMut<Target = u64>> DirectedChannelLiquidity<L> {
614 /// Adjusts the channel liquidity balance bounds when failing to route `amount_msat`.
615 fn failed_at_channel(&mut self, amount_msat: u64) {
616 if amount_msat < self.max_liquidity_msat() {
617 self.set_max_liquidity_msat(amount_msat);
621 /// Adjusts the channel liquidity balance bounds when failing to route `amount_msat` downstream.
622 fn failed_downstream(&mut self, amount_msat: u64) {
623 if amount_msat > self.min_liquidity_msat() {
624 self.set_min_liquidity_msat(amount_msat);
628 /// Adjusts the channel liquidity balance bounds when successfully routing `amount_msat`.
629 fn successful(&mut self, amount_msat: u64) {
630 let max_liquidity_msat = self.max_liquidity_msat().checked_sub(amount_msat).unwrap_or(0);
631 self.set_max_liquidity_msat(max_liquidity_msat);
634 /// Adjusts the lower bound of the channel liquidity balance in this direction.
635 fn set_min_liquidity_msat(&mut self, amount_msat: u64) {
636 *self.min_liquidity_offset_msat = amount_msat;
638 if amount_msat > self.max_liquidity_msat() {
639 *self.max_liquidity_offset_msat = 0;
643 /// Adjusts the upper bound of the channel liquidity balance in this direction.
644 fn set_max_liquidity_msat(&mut self, amount_msat: u64) {
645 *self.max_liquidity_offset_msat = self.capacity_msat.checked_sub(amount_msat).unwrap_or(0);
647 if amount_msat < self.min_liquidity_msat() {
648 *self.min_liquidity_offset_msat = 0;
653 impl<G: Deref<Target = NetworkGraph>> Score for ProbabilisticScorer<G> {
654 fn channel_penalty_msat(
655 &self, short_channel_id: u64, amount_msat: u64, capacity_msat: u64, source: &NodeId,
658 if *source == self.node_id || *target == self.node_id {
662 let liquidity_penalty_multiplier_msat = self.params.liquidity_penalty_multiplier_msat;
663 let success_probability = self.channel_liquidities
664 .get(&short_channel_id)
665 .unwrap_or(&ChannelLiquidity::new())
666 .as_directed(source, target, capacity_msat)
667 .success_probability(amount_msat);
668 if success_probability == 0.0 {
670 } else if success_probability == 1.0 {
673 (-(success_probability.log10()) * liquidity_penalty_multiplier_msat as f64) as u64
677 fn payment_path_failed(&mut self, path: &[&RouteHop], short_channel_id: u64) {
678 let amount_msat = path.split_last().map(|(hop, _)| hop.fee_msat).unwrap_or(0);
679 let network_graph = self.network_graph.read_only();
680 let hop_sources = core::iter::once(self.node_id)
681 .chain(path.iter().map(|hop| NodeId::from_pubkey(&hop.pubkey)));
682 for (source, hop) in hop_sources.zip(path.iter()) {
683 let target = NodeId::from_pubkey(&hop.pubkey);
684 if source == self.node_id || target == self.node_id {
688 let capacity_msat = network_graph.channels()
689 .get(&hop.short_channel_id)
690 .and_then(|channel| channel.as_directed_to(&target).map(|(d, _)| d.effective_capacity()))
691 .unwrap_or(EffectiveCapacity::Unknown)
694 if hop.short_channel_id == short_channel_id {
695 self.channel_liquidities
696 .entry(hop.short_channel_id)
697 .or_insert_with(|| ChannelLiquidity::new())
698 .as_directed_mut(&source, &target, capacity_msat)
699 .failed_at_channel(amount_msat);
703 self.channel_liquidities
704 .entry(hop.short_channel_id)
705 .or_insert_with(|| ChannelLiquidity::new())
706 .as_directed_mut(&source, &target, capacity_msat)
707 .failed_downstream(amount_msat);
711 fn payment_path_successful(&mut self, path: &[&RouteHop]) {
712 let amount_msat = path.split_last().map(|(hop, _)| hop.fee_msat).unwrap_or(0);
713 let network_graph = self.network_graph.read_only();
714 let hop_sources = core::iter::once(self.node_id)
715 .chain(path.iter().map(|hop| NodeId::from_pubkey(&hop.pubkey)));
716 for (source, hop) in hop_sources.zip(path.iter()) {
717 let target = NodeId::from_pubkey(&hop.pubkey);
718 if source == self.node_id || target == self.node_id {
722 let capacity_msat = network_graph.channels()
723 .get(&hop.short_channel_id)
724 .and_then(|channel| channel.as_directed_to(&target).map(|(d, _)| d.effective_capacity()))
725 .unwrap_or(EffectiveCapacity::Unknown)
728 self.channel_liquidities
729 .entry(hop.short_channel_id)
730 .or_insert_with(|| ChannelLiquidity::new())
731 .as_directed_mut(&source, &target, capacity_msat)
732 .successful(amount_msat);
737 impl<G: Deref<Target = NetworkGraph>> Writeable for ProbabilisticScorer<G> {
739 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
740 self.params.write(w)?;
741 self.channel_liquidities.write(w)?;
742 write_tlv_fields!(w, {});
747 impl<G: Deref<Target = NetworkGraph>> ReadableArgs<(&PublicKey, G)> for ProbabilisticScorer<G> {
749 fn read<R: Read>(r: &mut R, args: (&PublicKey, G)) -> Result<Self, DecodeError> {
750 let (node_pubkey, network_graph) = args;
752 params: Readable::read(r)?,
753 node_id: NodeId::from_pubkey(node_pubkey),
755 channel_liquidities: Readable::read(r)?,
757 read_tlv_fields!(r, {});
762 impl Writeable for ChannelLiquidity {
764 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
765 write_tlv_fields!(w, {
766 (0, self.min_liquidity_offset_msat, required),
767 (2, self.max_liquidity_offset_msat, required),
773 impl Readable for ChannelLiquidity {
775 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
776 let mut min_liquidity_offset_msat = 0;
777 let mut max_liquidity_offset_msat = 0;
778 read_tlv_fields!(r, {
779 (0, min_liquidity_offset_msat, required),
780 (2, max_liquidity_offset_msat, required),
783 min_liquidity_offset_msat,
784 max_liquidity_offset_msat
789 pub(crate) mod time {
791 use core::time::Duration;
792 /// A measurement of time.
793 pub trait Time: Sub<Duration, Output = Self> where Self: Sized {
794 /// Returns an instance corresponding to the current moment.
797 /// Returns the amount of time elapsed since `self` was created.
798 fn elapsed(&self) -> Duration;
800 /// Returns the amount of time passed since the beginning of [`Time`].
802 /// Used during (de-)serialization.
803 fn duration_since_epoch() -> Duration;
806 /// A state in which time has no meaning.
807 #[derive(Debug, PartialEq, Eq)]
810 #[cfg(not(feature = "no-std"))]
811 impl Time for std::time::Instant {
813 std::time::Instant::now()
816 fn duration_since_epoch() -> Duration {
817 use std::time::SystemTime;
818 SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap()
821 fn elapsed(&self) -> Duration {
822 std::time::Instant::elapsed(self)
826 impl Time for Eternity {
831 fn duration_since_epoch() -> Duration {
832 Duration::from_secs(0)
835 fn elapsed(&self) -> Duration {
836 Duration::from_secs(0)
840 impl Sub<Duration> for Eternity {
843 fn sub(self, _other: Duration) -> Self {
849 pub(crate) use self::time::Time;
853 use super::{ChannelLiquidity, ProbabilisticScoringParameters, ProbabilisticScorer, ScoringParameters, ScorerUsingTime, Time};
854 use super::time::Eternity;
856 use ln::features::{ChannelFeatures, NodeFeatures};
857 use ln::msgs::{ChannelAnnouncement, ChannelUpdate, OptionalField, UnsignedChannelAnnouncement, UnsignedChannelUpdate};
858 use routing::scoring::Score;
859 use routing::network_graph::{NetworkGraph, NodeId};
860 use routing::router::RouteHop;
861 use util::ser::{Readable, Writeable};
863 use bitcoin::blockdata::constants::genesis_block;
864 use bitcoin::hashes::Hash;
865 use bitcoin::hashes::sha256d::Hash as Sha256dHash;
866 use bitcoin::network::constants::Network;
867 use bitcoin::secp256k1::{PublicKey, Secp256k1, SecretKey};
868 use core::cell::Cell;
870 use core::time::Duration;
875 /// Time that can be advanced manually in tests.
876 #[derive(Debug, PartialEq, Eq)]
877 struct SinceEpoch(Duration);
881 static ELAPSED: Cell<Duration> = core::cell::Cell::new(Duration::from_secs(0));
884 fn advance(duration: Duration) {
885 Self::ELAPSED.with(|elapsed| elapsed.set(elapsed.get() + duration))
889 impl Time for SinceEpoch {
891 Self(Self::duration_since_epoch())
894 fn duration_since_epoch() -> Duration {
895 Self::ELAPSED.with(|elapsed| elapsed.get())
898 fn elapsed(&self) -> Duration {
899 Self::duration_since_epoch() - self.0
903 impl Sub<Duration> for SinceEpoch {
906 fn sub(self, other: Duration) -> Self {
912 fn time_passes_when_advanced() {
913 let now = SinceEpoch::now();
914 assert_eq!(now.elapsed(), Duration::from_secs(0));
916 SinceEpoch::advance(Duration::from_secs(1));
917 SinceEpoch::advance(Duration::from_secs(1));
919 let elapsed = now.elapsed();
920 let later = SinceEpoch::now();
922 assert_eq!(elapsed, Duration::from_secs(2));
923 assert_eq!(later - elapsed, now);
927 fn time_never_passes_in_an_eternity() {
928 let now = Eternity::now();
929 let elapsed = now.elapsed();
930 let later = Eternity::now();
932 assert_eq!(now.elapsed(), Duration::from_secs(0));
933 assert_eq!(later - elapsed, now);
938 /// A scorer for testing with time that can be manually advanced.
939 type Scorer = ScorerUsingTime::<SinceEpoch>;
941 fn source_privkey() -> SecretKey {
942 SecretKey::from_slice(&[42; 32]).unwrap()
945 fn target_privkey() -> SecretKey {
946 SecretKey::from_slice(&[43; 32]).unwrap()
949 fn source_pubkey() -> PublicKey {
950 let secp_ctx = Secp256k1::new();
951 PublicKey::from_secret_key(&secp_ctx, &source_privkey())
954 fn target_pubkey() -> PublicKey {
955 let secp_ctx = Secp256k1::new();
956 PublicKey::from_secret_key(&secp_ctx, &target_privkey())
959 fn source_node_id() -> NodeId {
960 NodeId::from_pubkey(&source_pubkey())
963 fn target_node_id() -> NodeId {
964 NodeId::from_pubkey(&target_pubkey())
968 fn penalizes_without_channel_failures() {
969 let scorer = Scorer::new(ScoringParameters {
970 base_penalty_msat: 1_000,
971 failure_penalty_msat: 512,
972 failure_penalty_half_life: Duration::from_secs(1),
973 overuse_penalty_start_1024th: 1024,
974 overuse_penalty_msat_per_1024th: 0,
976 let source = source_node_id();
977 let target = target_node_id();
978 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_000);
980 SinceEpoch::advance(Duration::from_secs(1));
981 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_000);
985 fn accumulates_channel_failure_penalties() {
986 let mut scorer = Scorer::new(ScoringParameters {
987 base_penalty_msat: 1_000,
988 failure_penalty_msat: 64,
989 failure_penalty_half_life: Duration::from_secs(10),
990 overuse_penalty_start_1024th: 1024,
991 overuse_penalty_msat_per_1024th: 0,
993 let source = source_node_id();
994 let target = target_node_id();
995 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_000);
997 scorer.payment_path_failed(&[], 42);
998 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_064);
1000 scorer.payment_path_failed(&[], 42);
1001 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_128);
1003 scorer.payment_path_failed(&[], 42);
1004 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_192);
1008 fn decays_channel_failure_penalties_over_time() {
1009 let mut scorer = Scorer::new(ScoringParameters {
1010 base_penalty_msat: 1_000,
1011 failure_penalty_msat: 512,
1012 failure_penalty_half_life: Duration::from_secs(10),
1013 overuse_penalty_start_1024th: 1024,
1014 overuse_penalty_msat_per_1024th: 0,
1016 let source = source_node_id();
1017 let target = target_node_id();
1018 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_000);
1020 scorer.payment_path_failed(&[], 42);
1021 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_512);
1023 SinceEpoch::advance(Duration::from_secs(9));
1024 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_512);
1026 SinceEpoch::advance(Duration::from_secs(1));
1027 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_256);
1029 SinceEpoch::advance(Duration::from_secs(10 * 8));
1030 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_001);
1032 SinceEpoch::advance(Duration::from_secs(10));
1033 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_000);
1035 SinceEpoch::advance(Duration::from_secs(10));
1036 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_000);
1040 fn decays_channel_failure_penalties_without_shift_overflow() {
1041 let mut scorer = Scorer::new(ScoringParameters {
1042 base_penalty_msat: 1_000,
1043 failure_penalty_msat: 512,
1044 failure_penalty_half_life: Duration::from_secs(10),
1045 overuse_penalty_start_1024th: 1024,
1046 overuse_penalty_msat_per_1024th: 0,
1048 let source = source_node_id();
1049 let target = target_node_id();
1050 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_000);
1052 scorer.payment_path_failed(&[], 42);
1053 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_512);
1055 // An unchecked right shift 64 bits or more in ChannelFailure::decayed_penalty_msat would
1056 // cause an overflow.
1057 SinceEpoch::advance(Duration::from_secs(10 * 64));
1058 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_000);
1060 SinceEpoch::advance(Duration::from_secs(10));
1061 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_000);
1065 fn accumulates_channel_failure_penalties_after_decay() {
1066 let mut scorer = Scorer::new(ScoringParameters {
1067 base_penalty_msat: 1_000,
1068 failure_penalty_msat: 512,
1069 failure_penalty_half_life: Duration::from_secs(10),
1070 overuse_penalty_start_1024th: 1024,
1071 overuse_penalty_msat_per_1024th: 0,
1073 let source = source_node_id();
1074 let target = target_node_id();
1075 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_000);
1077 scorer.payment_path_failed(&[], 42);
1078 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_512);
1080 SinceEpoch::advance(Duration::from_secs(10));
1081 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_256);
1083 scorer.payment_path_failed(&[], 42);
1084 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_768);
1086 SinceEpoch::advance(Duration::from_secs(10));
1087 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_384);
1091 fn reduces_channel_failure_penalties_after_success() {
1092 let mut scorer = Scorer::new(ScoringParameters {
1093 base_penalty_msat: 1_000,
1094 failure_penalty_msat: 512,
1095 failure_penalty_half_life: Duration::from_secs(10),
1096 overuse_penalty_start_1024th: 1024,
1097 overuse_penalty_msat_per_1024th: 0,
1099 let source = source_node_id();
1100 let target = target_node_id();
1101 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_000);
1103 scorer.payment_path_failed(&[], 42);
1104 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_512);
1106 SinceEpoch::advance(Duration::from_secs(10));
1107 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_256);
1109 let hop = RouteHop {
1110 pubkey: PublicKey::from_slice(target.as_slice()).unwrap(),
1111 node_features: NodeFeatures::known(),
1112 short_channel_id: 42,
1113 channel_features: ChannelFeatures::known(),
1115 cltv_expiry_delta: 18,
1117 scorer.payment_path_successful(&[&hop]);
1118 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_128);
1120 SinceEpoch::advance(Duration::from_secs(10));
1121 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_064);
1125 fn restores_persisted_channel_failure_penalties() {
1126 let mut scorer = Scorer::new(ScoringParameters {
1127 base_penalty_msat: 1_000,
1128 failure_penalty_msat: 512,
1129 failure_penalty_half_life: Duration::from_secs(10),
1130 overuse_penalty_start_1024th: 1024,
1131 overuse_penalty_msat_per_1024th: 0,
1133 let source = source_node_id();
1134 let target = target_node_id();
1136 scorer.payment_path_failed(&[], 42);
1137 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_512);
1139 SinceEpoch::advance(Duration::from_secs(10));
1140 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_256);
1142 scorer.payment_path_failed(&[], 43);
1143 assert_eq!(scorer.channel_penalty_msat(43, 1, 1, &source, &target), 1_512);
1145 let mut serialized_scorer = Vec::new();
1146 scorer.write(&mut serialized_scorer).unwrap();
1148 let deserialized_scorer = <Scorer>::read(&mut io::Cursor::new(&serialized_scorer)).unwrap();
1149 assert_eq!(deserialized_scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_256);
1150 assert_eq!(deserialized_scorer.channel_penalty_msat(43, 1, 1, &source, &target), 1_512);
1154 fn decays_persisted_channel_failure_penalties() {
1155 let mut scorer = Scorer::new(ScoringParameters {
1156 base_penalty_msat: 1_000,
1157 failure_penalty_msat: 512,
1158 failure_penalty_half_life: Duration::from_secs(10),
1159 overuse_penalty_start_1024th: 1024,
1160 overuse_penalty_msat_per_1024th: 0,
1162 let source = source_node_id();
1163 let target = target_node_id();
1165 scorer.payment_path_failed(&[], 42);
1166 assert_eq!(scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_512);
1168 let mut serialized_scorer = Vec::new();
1169 scorer.write(&mut serialized_scorer).unwrap();
1171 SinceEpoch::advance(Duration::from_secs(10));
1173 let deserialized_scorer = <Scorer>::read(&mut io::Cursor::new(&serialized_scorer)).unwrap();
1174 assert_eq!(deserialized_scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_256);
1176 SinceEpoch::advance(Duration::from_secs(10));
1177 assert_eq!(deserialized_scorer.channel_penalty_msat(42, 1, 1, &source, &target), 1_128);
1181 fn charges_per_1024th_penalty() {
1182 let scorer = Scorer::new(ScoringParameters {
1183 base_penalty_msat: 0,
1184 failure_penalty_msat: 0,
1185 failure_penalty_half_life: Duration::from_secs(0),
1186 overuse_penalty_start_1024th: 256,
1187 overuse_penalty_msat_per_1024th: 100,
1189 let source = source_node_id();
1190 let target = target_node_id();
1192 assert_eq!(scorer.channel_penalty_msat(42, 1_000, 1_024_000, &source, &target), 0);
1193 assert_eq!(scorer.channel_penalty_msat(42, 256_999, 1_024_000, &source, &target), 0);
1194 assert_eq!(scorer.channel_penalty_msat(42, 257_000, 1_024_000, &source, &target), 100);
1195 assert_eq!(scorer.channel_penalty_msat(42, 258_000, 1_024_000, &source, &target), 200);
1196 assert_eq!(scorer.channel_penalty_msat(42, 512_000, 1_024_000, &source, &target), 256 * 100);
1199 // `ProbabilisticScorer` tests
1201 fn sender_privkey() -> SecretKey {
1202 SecretKey::from_slice(&[41; 32]).unwrap()
1205 fn recipient_privkey() -> SecretKey {
1206 SecretKey::from_slice(&[45; 32]).unwrap()
1209 fn sender_pubkey() -> PublicKey {
1210 let secp_ctx = Secp256k1::new();
1211 PublicKey::from_secret_key(&secp_ctx, &sender_privkey())
1214 fn recipient_pubkey() -> PublicKey {
1215 let secp_ctx = Secp256k1::new();
1216 PublicKey::from_secret_key(&secp_ctx, &recipient_privkey())
1219 fn sender_node_id() -> NodeId {
1220 NodeId::from_pubkey(&sender_pubkey())
1223 fn recipient_node_id() -> NodeId {
1224 NodeId::from_pubkey(&recipient_pubkey())
1227 fn network_graph() -> NetworkGraph {
1228 let genesis_hash = genesis_block(Network::Testnet).header.block_hash();
1229 let mut network_graph = NetworkGraph::new(genesis_hash);
1230 add_channel(&mut network_graph, 41, sender_privkey(), source_privkey());
1231 add_channel(&mut network_graph, 42, source_privkey(), target_privkey());
1232 add_channel(&mut network_graph, 43, target_privkey(), recipient_privkey());
1238 network_graph: &mut NetworkGraph, short_channel_id: u64, node_1_key: SecretKey,
1239 node_2_key: SecretKey
1241 let genesis_hash = genesis_block(Network::Testnet).header.block_hash();
1242 let node_1_secret = &SecretKey::from_slice(&[39; 32]).unwrap();
1243 let node_2_secret = &SecretKey::from_slice(&[40; 32]).unwrap();
1244 let secp_ctx = Secp256k1::new();
1245 let unsigned_announcement = UnsignedChannelAnnouncement {
1246 features: ChannelFeatures::known(),
1247 chain_hash: genesis_hash,
1249 node_id_1: PublicKey::from_secret_key(&secp_ctx, &node_1_key),
1250 node_id_2: PublicKey::from_secret_key(&secp_ctx, &node_2_key),
1251 bitcoin_key_1: PublicKey::from_secret_key(&secp_ctx, &node_1_secret),
1252 bitcoin_key_2: PublicKey::from_secret_key(&secp_ctx, &node_2_secret),
1253 excess_data: Vec::new(),
1255 let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
1256 let signed_announcement = ChannelAnnouncement {
1257 node_signature_1: secp_ctx.sign(&msghash, &node_1_key),
1258 node_signature_2: secp_ctx.sign(&msghash, &node_2_key),
1259 bitcoin_signature_1: secp_ctx.sign(&msghash, &node_1_secret),
1260 bitcoin_signature_2: secp_ctx.sign(&msghash, &node_2_secret),
1261 contents: unsigned_announcement,
1263 let chain_source: Option<&::util::test_utils::TestChainSource> = None;
1264 network_graph.update_channel_from_announcement(
1265 &signed_announcement, &chain_source, &secp_ctx).unwrap();
1266 update_channel(network_graph, short_channel_id, node_1_key, 0);
1267 update_channel(network_graph, short_channel_id, node_2_key, 1);
1271 network_graph: &mut NetworkGraph, short_channel_id: u64, node_key: SecretKey, flags: u8
1273 let genesis_hash = genesis_block(Network::Testnet).header.block_hash();
1274 let secp_ctx = Secp256k1::new();
1275 let unsigned_update = UnsignedChannelUpdate {
1276 chain_hash: genesis_hash,
1280 cltv_expiry_delta: 18,
1281 htlc_minimum_msat: 0,
1282 htlc_maximum_msat: OptionalField::Present(1_000),
1284 fee_proportional_millionths: 0,
1285 excess_data: Vec::new(),
1287 let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_update.encode()[..])[..]);
1288 let signed_update = ChannelUpdate {
1289 signature: secp_ctx.sign(&msghash, &node_key),
1290 contents: unsigned_update,
1292 network_graph.update_channel(&signed_update, &secp_ctx).unwrap();
1295 fn payment_path_for_amount(amount_msat: u64) -> Vec<RouteHop> {
1298 pubkey: source_pubkey(),
1299 node_features: NodeFeatures::known(),
1300 short_channel_id: 41,
1301 channel_features: ChannelFeatures::known(),
1303 cltv_expiry_delta: 18,
1306 pubkey: target_pubkey(),
1307 node_features: NodeFeatures::known(),
1308 short_channel_id: 42,
1309 channel_features: ChannelFeatures::known(),
1311 cltv_expiry_delta: 18,
1314 pubkey: recipient_pubkey(),
1315 node_features: NodeFeatures::known(),
1316 short_channel_id: 43,
1317 channel_features: ChannelFeatures::known(),
1318 fee_msat: amount_msat,
1319 cltv_expiry_delta: 18,
1325 fn liquidity_bounds_directed_from_lowest_node_id() {
1326 let network_graph = network_graph();
1327 let params = ProbabilisticScoringParameters::default();
1328 let mut scorer = ProbabilisticScorer::new(params, &sender_pubkey(), &network_graph)
1331 min_liquidity_offset_msat: 700, max_liquidity_offset_msat: 100
1335 min_liquidity_offset_msat: 700, max_liquidity_offset_msat: 100
1337 let source = source_node_id();
1338 let target = target_node_id();
1339 let recipient = recipient_node_id();
1341 let liquidity = scorer.channel_liquidities.get_mut(&42).unwrap();
1342 assert!(source > target);
1343 assert_eq!(liquidity.as_directed(&source, &target, 1_000).min_liquidity_msat(), 100);
1344 assert_eq!(liquidity.as_directed(&source, &target, 1_000).max_liquidity_msat(), 300);
1345 assert_eq!(liquidity.as_directed(&target, &source, 1_000).min_liquidity_msat(), 700);
1346 assert_eq!(liquidity.as_directed(&target, &source, 1_000).max_liquidity_msat(), 900);
1348 liquidity.as_directed_mut(&source, &target, 1_000).set_min_liquidity_msat(200);
1349 assert_eq!(liquidity.as_directed(&source, &target, 1_000).min_liquidity_msat(), 200);
1350 assert_eq!(liquidity.as_directed(&source, &target, 1_000).max_liquidity_msat(), 300);
1351 assert_eq!(liquidity.as_directed(&target, &source, 1_000).min_liquidity_msat(), 700);
1352 assert_eq!(liquidity.as_directed(&target, &source, 1_000).max_liquidity_msat(), 800);
1354 let liquidity = scorer.channel_liquidities.get_mut(&43).unwrap();
1355 assert!(target < recipient);
1356 assert_eq!(liquidity.as_directed(&target, &recipient, 1_000).min_liquidity_msat(), 700);
1357 assert_eq!(liquidity.as_directed(&target, &recipient, 1_000).max_liquidity_msat(), 900);
1358 assert_eq!(liquidity.as_directed(&recipient, &target, 1_000).min_liquidity_msat(), 100);
1359 assert_eq!(liquidity.as_directed(&recipient, &target, 1_000).max_liquidity_msat(), 300);
1361 liquidity.as_directed_mut(&target, &recipient, 1_000).set_max_liquidity_msat(200);
1362 assert_eq!(liquidity.as_directed(&target, &recipient, 1_000).min_liquidity_msat(), 0);
1363 assert_eq!(liquidity.as_directed(&target, &recipient, 1_000).max_liquidity_msat(), 200);
1364 assert_eq!(liquidity.as_directed(&recipient, &target, 1_000).min_liquidity_msat(), 800);
1365 assert_eq!(liquidity.as_directed(&recipient, &target, 1_000).max_liquidity_msat(), 1000);
1369 fn resets_liquidity_upper_bound_when_crossed_by_lower_bound() {
1370 let network_graph = network_graph();
1371 let params = ProbabilisticScoringParameters::default();
1372 let mut scorer = ProbabilisticScorer::new(params, &sender_pubkey(), &network_graph)
1375 min_liquidity_offset_msat: 200, max_liquidity_offset_msat: 400
1377 let source = source_node_id();
1378 let target = target_node_id();
1379 assert!(source > target);
1381 // Check initial bounds.
1382 let liquidity = scorer.channel_liquidities.get(&42).unwrap()
1383 .as_directed(&source, &target, 1_000);
1384 assert_eq!(liquidity.min_liquidity_msat(), 400);
1385 assert_eq!(liquidity.max_liquidity_msat(), 800);
1387 let liquidity = scorer.channel_liquidities.get(&42).unwrap()
1388 .as_directed(&target, &source, 1_000);
1389 assert_eq!(liquidity.min_liquidity_msat(), 200);
1390 assert_eq!(liquidity.max_liquidity_msat(), 600);
1392 // Reset from source to target.
1393 scorer.channel_liquidities.get_mut(&42).unwrap()
1394 .as_directed_mut(&source, &target, 1_000)
1395 .set_min_liquidity_msat(900);
1397 let liquidity = scorer.channel_liquidities.get(&42).unwrap()
1398 .as_directed(&source, &target, 1_000);
1399 assert_eq!(liquidity.min_liquidity_msat(), 900);
1400 assert_eq!(liquidity.max_liquidity_msat(), 1_000);
1402 let liquidity = scorer.channel_liquidities.get(&42).unwrap()
1403 .as_directed(&target, &source, 1_000);
1404 assert_eq!(liquidity.min_liquidity_msat(), 0);
1405 assert_eq!(liquidity.max_liquidity_msat(), 100);
1407 // Reset from target to source.
1408 scorer.channel_liquidities.get_mut(&42).unwrap()
1409 .as_directed_mut(&target, &source, 1_000)
1410 .set_min_liquidity_msat(400);
1412 let liquidity = scorer.channel_liquidities.get(&42).unwrap()
1413 .as_directed(&source, &target, 1_000);
1414 assert_eq!(liquidity.min_liquidity_msat(), 0);
1415 assert_eq!(liquidity.max_liquidity_msat(), 600);
1417 let liquidity = scorer.channel_liquidities.get(&42).unwrap()
1418 .as_directed(&target, &source, 1_000);
1419 assert_eq!(liquidity.min_liquidity_msat(), 400);
1420 assert_eq!(liquidity.max_liquidity_msat(), 1_000);
1424 fn resets_liquidity_lower_bound_when_crossed_by_upper_bound() {
1425 let network_graph = network_graph();
1426 let params = ProbabilisticScoringParameters::default();
1427 let mut scorer = ProbabilisticScorer::new(params, &sender_pubkey(), &network_graph)
1430 min_liquidity_offset_msat: 200, max_liquidity_offset_msat: 400
1432 let source = source_node_id();
1433 let target = target_node_id();
1434 assert!(source > target);
1436 // Check initial bounds.
1437 let liquidity = scorer.channel_liquidities.get(&42).unwrap()
1438 .as_directed(&source, &target, 1_000);
1439 assert_eq!(liquidity.min_liquidity_msat(), 400);
1440 assert_eq!(liquidity.max_liquidity_msat(), 800);
1442 let liquidity = scorer.channel_liquidities.get(&42).unwrap()
1443 .as_directed(&target, &source, 1_000);
1444 assert_eq!(liquidity.min_liquidity_msat(), 200);
1445 assert_eq!(liquidity.max_liquidity_msat(), 600);
1447 // Reset from source to target.
1448 scorer.channel_liquidities.get_mut(&42).unwrap()
1449 .as_directed_mut(&source, &target, 1_000)
1450 .set_max_liquidity_msat(300);
1452 let liquidity = scorer.channel_liquidities.get(&42).unwrap()
1453 .as_directed(&source, &target, 1_000);
1454 assert_eq!(liquidity.min_liquidity_msat(), 0);
1455 assert_eq!(liquidity.max_liquidity_msat(), 300);
1457 let liquidity = scorer.channel_liquidities.get(&42).unwrap()
1458 .as_directed(&target, &source, 1_000);
1459 assert_eq!(liquidity.min_liquidity_msat(), 700);
1460 assert_eq!(liquidity.max_liquidity_msat(), 1_000);
1462 // Reset from target to source.
1463 scorer.channel_liquidities.get_mut(&42).unwrap()
1464 .as_directed_mut(&target, &source, 1_000)
1465 .set_max_liquidity_msat(600);
1467 let liquidity = scorer.channel_liquidities.get(&42).unwrap()
1468 .as_directed(&source, &target, 1_000);
1469 assert_eq!(liquidity.min_liquidity_msat(), 400);
1470 assert_eq!(liquidity.max_liquidity_msat(), 1_000);
1472 let liquidity = scorer.channel_liquidities.get(&42).unwrap()
1473 .as_directed(&target, &source, 1_000);
1474 assert_eq!(liquidity.min_liquidity_msat(), 0);
1475 assert_eq!(liquidity.max_liquidity_msat(), 600);
1479 fn increased_penalty_nearing_liquidity_upper_bound() {
1480 let network_graph = network_graph();
1481 let params = ProbabilisticScoringParameters::default();
1482 let scorer = ProbabilisticScorer::new(params, &sender_pubkey(), &network_graph);
1483 let source = source_node_id();
1484 let target = target_node_id();
1486 assert_eq!(scorer.channel_penalty_msat(42, 100, 100_000, &source, &target), 0);
1487 assert_eq!(scorer.channel_penalty_msat(42, 1_000, 100_000, &source, &target), 4);
1488 assert_eq!(scorer.channel_penalty_msat(42, 10_000, 100_000, &source, &target), 45);
1489 assert_eq!(scorer.channel_penalty_msat(42, 100_000, 100_000, &source, &target), 2_000);
1491 assert_eq!(scorer.channel_penalty_msat(42, 125, 1_000, &source, &target), 57);
1492 assert_eq!(scorer.channel_penalty_msat(42, 250, 1_000, &source, &target), 124);
1493 assert_eq!(scorer.channel_penalty_msat(42, 375, 1_000, &source, &target), 203);
1494 assert_eq!(scorer.channel_penalty_msat(42, 500, 1_000, &source, &target), 300);
1495 assert_eq!(scorer.channel_penalty_msat(42, 625, 1_000, &source, &target), 425);
1496 assert_eq!(scorer.channel_penalty_msat(42, 750, 1_000, &source, &target), 600);
1497 assert_eq!(scorer.channel_penalty_msat(42, 875, 1_000, &source, &target), 900);
1501 fn constant_penalty_outside_liquidity_bounds() {
1502 let network_graph = network_graph();
1503 let params = ProbabilisticScoringParameters::default();
1504 let scorer = ProbabilisticScorer::new(params, &sender_pubkey(), &network_graph)
1506 ChannelLiquidity { min_liquidity_offset_msat: 40, max_liquidity_offset_msat: 40 });
1507 let source = source_node_id();
1508 let target = target_node_id();
1510 assert_eq!(scorer.channel_penalty_msat(42, 39, 100, &source, &target), 0);
1511 assert_ne!(scorer.channel_penalty_msat(42, 50, 100, &source, &target), 0);
1512 assert_ne!(scorer.channel_penalty_msat(42, 50, 100, &source, &target), 2_000);
1513 assert_eq!(scorer.channel_penalty_msat(42, 61, 100, &source, &target), 2_000);
1517 fn does_not_penalize_own_channel() {
1518 let network_graph = network_graph();
1519 let params = ProbabilisticScoringParameters::default();
1520 let mut scorer = ProbabilisticScorer::new(params, &sender_pubkey(), &network_graph);
1521 let sender = sender_node_id();
1522 let source = source_node_id();
1523 let failed_path = payment_path_for_amount(500);
1524 let successful_path = payment_path_for_amount(200);
1526 assert_eq!(scorer.channel_penalty_msat(41, 500, 1_000, &sender, &source), 0);
1528 scorer.payment_path_failed(&failed_path.iter().collect::<Vec<_>>(), 41);
1529 assert_eq!(scorer.channel_penalty_msat(41, 500, 1_000, &sender, &source), 0);
1531 scorer.payment_path_successful(&successful_path.iter().collect::<Vec<_>>());
1532 assert_eq!(scorer.channel_penalty_msat(41, 500, 1_000, &sender, &source), 0);
1536 fn sets_liquidity_lower_bound_on_downstream_failure() {
1537 let network_graph = network_graph();
1538 let params = ProbabilisticScoringParameters::default();
1539 let mut scorer = ProbabilisticScorer::new(params, &sender_pubkey(), &network_graph);
1540 let source = source_node_id();
1541 let target = target_node_id();
1542 let path = payment_path_for_amount(500);
1544 assert_eq!(scorer.channel_penalty_msat(42, 250, 1_000, &source, &target), 124);
1545 assert_eq!(scorer.channel_penalty_msat(42, 500, 1_000, &source, &target), 300);
1546 assert_eq!(scorer.channel_penalty_msat(42, 750, 1_000, &source, &target), 600);
1548 scorer.payment_path_failed(&path.iter().collect::<Vec<_>>(), 43);
1550 assert_eq!(scorer.channel_penalty_msat(42, 250, 1_000, &source, &target), 0);
1551 assert_eq!(scorer.channel_penalty_msat(42, 500, 1_000, &source, &target), 0);
1552 assert_eq!(scorer.channel_penalty_msat(42, 750, 1_000, &source, &target), 300);
1556 fn sets_liquidity_upper_bound_on_failure() {
1557 let network_graph = network_graph();
1558 let params = ProbabilisticScoringParameters::default();
1559 let mut scorer = ProbabilisticScorer::new(params, &sender_pubkey(), &network_graph);
1560 let source = source_node_id();
1561 let target = target_node_id();
1562 let path = payment_path_for_amount(500);
1564 assert_eq!(scorer.channel_penalty_msat(42, 250, 1_000, &source, &target), 124);
1565 assert_eq!(scorer.channel_penalty_msat(42, 500, 1_000, &source, &target), 300);
1566 assert_eq!(scorer.channel_penalty_msat(42, 750, 1_000, &source, &target), 600);
1568 scorer.payment_path_failed(&path.iter().collect::<Vec<_>>(), 42);
1570 assert_eq!(scorer.channel_penalty_msat(42, 250, 1_000, &source, &target), 300);
1571 assert_eq!(scorer.channel_penalty_msat(42, 500, 1_000, &source, &target), 2_000);
1572 assert_eq!(scorer.channel_penalty_msat(42, 750, 1_000, &source, &target), 2_000);
1576 fn reduces_liquidity_upper_bound_along_path_on_success() {
1577 let network_graph = network_graph();
1578 let params = ProbabilisticScoringParameters::default();
1579 let mut scorer = ProbabilisticScorer::new(params, &sender_pubkey(), &network_graph);
1580 let sender = sender_node_id();
1581 let source = source_node_id();
1582 let target = target_node_id();
1583 let recipient = recipient_node_id();
1584 let path = payment_path_for_amount(500);
1586 assert_eq!(scorer.channel_penalty_msat(41, 250, 1_000, &sender, &source), 0);
1587 assert_eq!(scorer.channel_penalty_msat(42, 250, 1_000, &source, &target), 124);
1588 assert_eq!(scorer.channel_penalty_msat(43, 250, 1_000, &target, &recipient), 124);
1590 scorer.payment_path_successful(&path.iter().collect::<Vec<_>>());
1592 assert_eq!(scorer.channel_penalty_msat(41, 250, 1_000, &sender, &source), 0);
1593 assert_eq!(scorer.channel_penalty_msat(42, 250, 1_000, &source, &target), 300);
1594 assert_eq!(scorer.channel_penalty_msat(43, 250, 1_000, &target, &recipient), 300);