//! Utilities for scoring payment channels.
//!
//! [`ProbabilisticScorer`] may be given to [`find_route`] to score payment channels during path
-//! finding when a custom [`Score`] implementation is not needed.
+//! finding when a custom [`ScoreLookUp`] implementation is not needed.
//!
//! # Example
//!
//! #
//! # use lightning::routing::gossip::NetworkGraph;
//! # use lightning::routing::router::{RouteParameters, find_route};
-//! # use lightning::routing::scoring::{ProbabilisticScorer, ProbabilisticScoringParameters};
-//! # use lightning::chain::keysinterface::{KeysManager, KeysInterface};
+//! # use lightning::routing::scoring::{ProbabilisticScorer, ProbabilisticScoringFeeParameters, ProbabilisticScoringDecayParameters};
+//! # use lightning::sign::KeysManager;
//! # use lightning::util::logger::{Logger, Record};
//! # use bitcoin::secp256k1::PublicKey;
//! #
//! # let logger = FakeLogger {};
//! #
//! // Use the default channel penalties.
-//! let params = ProbabilisticScoringParameters::default();
-//! let scorer = ProbabilisticScorer::new(params, &network_graph, &logger);
+//! let params = ProbabilisticScoringFeeParameters::default();
+//! let decay_params = ProbabilisticScoringDecayParameters::default();
+//! let scorer = ProbabilisticScorer::new(decay_params, &network_graph, &logger);
//!
//! // Or use custom channel penalties.
-//! let params = ProbabilisticScoringParameters {
-//! liquidity_penalty_multiplier_msat: 2 * 1000,
-//! ..ProbabilisticScoringParameters::default()
+//! let params = ProbabilisticScoringFeeParameters {
+//! liquidity_penalty_multiplier_msat: 2 * 1000,
+//! ..ProbabilisticScoringFeeParameters::default()
//! };
-//! let scorer = ProbabilisticScorer::new(params, &network_graph, &logger);
+//! let decay_params = ProbabilisticScoringDecayParameters::default();
+//! let scorer = ProbabilisticScorer::new(decay_params, &network_graph, &logger);
//! # let random_seed_bytes = [42u8; 32];
//!
-//! let route = find_route(&payer, &route_params, &network_graph, None, &logger, &scorer, &random_seed_bytes);
+//! let route = find_route(&payer, &route_params, &network_graph, None, &logger, &scorer, ¶ms, &random_seed_bytes);
//! # }
//! ```
//!
use crate::ln::msgs::DecodeError;
use crate::routing::gossip::{EffectiveCapacity, NetworkGraph, NodeId};
-use crate::routing::router::RouteHop;
+use crate::routing::router::Path;
use crate::util::ser::{Readable, ReadableArgs, Writeable, Writer};
use crate::util::logger::Logger;
use crate::util::time::Time;
use crate::prelude::*;
use core::{cmp, fmt};
-use core::cell::{RefCell, RefMut};
+use core::cell::{RefCell, RefMut, Ref};
use core::convert::TryInto;
use core::ops::{Deref, DerefMut};
use core::time::Duration;
use crate::io::{self, Read};
-use crate::sync::{Mutex, MutexGuard};
+use crate::sync::{Mutex, MutexGuard, RwLock, RwLockReadGuard, RwLockWriteGuard};
/// We define Score ever-so-slightly differently based on whether we are being built for C bindings
/// or not. For users, `LockableScore` must somehow be writeable to disk. For Rust users, this is
macro_rules! define_score { ($($supertrait: path)*) => {
/// An interface used to score payment channels for path finding.
///
-/// Scoring is in terms of fees willing to be paid in order to avoid routing through a channel.
-pub trait Score $(: $supertrait)* {
+/// `ScoreLookUp` is used to determine the penalty for a given channel.
+///
+/// Scoring is in terms of fees willing to be paid in order to avoid routing through a channel.
+pub trait ScoreLookUp {
+ /// A configurable type which should contain various passed-in parameters for configuring the scorer,
+ /// on a per-routefinding-call basis through to the scorer methods,
+ /// which are used to determine the parameters for the suitability of channels for use.
+ type ScoreParams;
/// Returns the fee in msats willing to be paid to avoid routing `send_amt_msat` through the
/// given channel in the direction from `source` to `target`.
///
/// [`u64::max_value`] is given to indicate sufficient capacity for the invoice's full amount.
/// Thus, implementations should be overflow-safe.
fn channel_penalty_msat(
- &self, short_channel_id: u64, source: &NodeId, target: &NodeId, usage: ChannelUsage
+ &self, short_channel_id: u64, source: &NodeId, target: &NodeId, usage: ChannelUsage, score_params: &Self::ScoreParams
) -> u64;
+}
+/// `ScoreUpdate` is used to update the scorer's internal state after a payment attempt.
+pub trait ScoreUpdate {
/// Handles updating channel penalties after failing to route through a channel.
- fn payment_path_failed(&mut self, path: &[&RouteHop], short_channel_id: u64);
+ fn payment_path_failed(&mut self, path: &Path, short_channel_id: u64);
/// Handles updating channel penalties after successfully routing along a path.
- fn payment_path_successful(&mut self, path: &[&RouteHop]);
+ fn payment_path_successful(&mut self, path: &Path);
/// Handles updating channel penalties after a probe over the given path failed.
- fn probe_failed(&mut self, path: &[&RouteHop], short_channel_id: u64);
+ fn probe_failed(&mut self, path: &Path, short_channel_id: u64);
/// Handles updating channel penalties after a probe over the given path succeeded.
- fn probe_successful(&mut self, path: &[&RouteHop]);
+ fn probe_successful(&mut self, path: &Path);
}
-impl<S: Score, T: DerefMut<Target=S> $(+ $supertrait)*> Score for T {
+/// A trait which can both lookup and update routing channel penalty scores.
+///
+/// This is used in places where both bounds are required and implemented for all types which
+/// implement [`ScoreLookUp`] and [`ScoreUpdate`].
+///
+/// Bindings users may need to manually implement this for their custom scoring implementations.
+pub trait Score : ScoreLookUp + ScoreUpdate $(+ $supertrait)* {}
+
+#[cfg(not(c_bindings))]
+impl<T: ScoreLookUp + ScoreUpdate $(+ $supertrait)*> Score for T {}
+
+#[cfg(not(c_bindings))]
+impl<S: ScoreLookUp, T: Deref<Target=S>> ScoreLookUp for T {
+ type ScoreParams = S::ScoreParams;
fn channel_penalty_msat(
- &self, short_channel_id: u64, source: &NodeId, target: &NodeId, usage: ChannelUsage
+ &self, short_channel_id: u64, source: &NodeId, target: &NodeId, usage: ChannelUsage, score_params: &Self::ScoreParams
) -> u64 {
- self.deref().channel_penalty_msat(short_channel_id, source, target, usage)
+ self.deref().channel_penalty_msat(short_channel_id, source, target, usage, score_params)
}
+}
- fn payment_path_failed(&mut self, path: &[&RouteHop], short_channel_id: u64) {
+#[cfg(not(c_bindings))]
+impl<S: ScoreUpdate, T: DerefMut<Target=S>> ScoreUpdate for T {
+ fn payment_path_failed(&mut self, path: &Path, short_channel_id: u64) {
self.deref_mut().payment_path_failed(path, short_channel_id)
}
- fn payment_path_successful(&mut self, path: &[&RouteHop]) {
+ fn payment_path_successful(&mut self, path: &Path) {
self.deref_mut().payment_path_successful(path)
}
- fn probe_failed(&mut self, path: &[&RouteHop], short_channel_id: u64) {
+ fn probe_failed(&mut self, path: &Path, short_channel_id: u64) {
self.deref_mut().probe_failed(path, short_channel_id)
}
- fn probe_successful(&mut self, path: &[&RouteHop]) {
+ fn probe_successful(&mut self, path: &Path) {
self.deref_mut().probe_successful(path)
}
}
#[cfg(c_bindings)]
define_score!(Writeable);
+
#[cfg(not(c_bindings))]
define_score!();
/// A scorer that is accessed under a lock.
///
-/// Needed so that calls to [`Score::channel_penalty_msat`] in [`find_route`] can be made while
-/// having shared ownership of a scorer but without requiring internal locking in [`Score`]
+/// Needed so that calls to [`ScoreLookUp::channel_penalty_msat`] in [`find_route`] can be made while
+/// having shared ownership of a scorer but without requiring internal locking in [`ScoreUpdate`]
/// implementations. Internal locking would be detrimental to route finding performance and could
-/// result in [`Score::channel_penalty_msat`] returning a different value for the same channel.
+/// result in [`ScoreLookUp::channel_penalty_msat`] returning a different value for the same channel.
///
/// [`find_route`]: crate::routing::router::find_route
pub trait LockableScore<'a> {
- /// The locked [`Score`] type.
- type Locked: 'a + Score;
+ /// The [`ScoreUpdate`] type.
+ type ScoreUpdate: 'a + ScoreUpdate;
+ /// The [`ScoreLookUp`] type.
+ type ScoreLookUp: 'a + ScoreLookUp;
+
+ /// The write locked [`ScoreUpdate`] type.
+ type WriteLocked: DerefMut<Target = Self::ScoreUpdate> + Sized;
- /// Returns the locked scorer.
- fn lock(&'a self) -> Self::Locked;
+ /// The read locked [`ScoreLookUp`] type.
+ type ReadLocked: Deref<Target = Self::ScoreLookUp> + Sized;
+
+ /// Returns read locked scorer.
+ fn read_lock(&'a self) -> Self::ReadLocked;
+
+ /// Returns write locked scorer.
+ fn write_lock(&'a self) -> Self::WriteLocked;
}
/// Refers to a scorer that is accessible under lock and also writeable to disk
#[cfg(not(c_bindings))]
impl<'a, T> WriteableScore<'a> for T where T: LockableScore<'a> + Writeable {}
+#[cfg(not(c_bindings))]
+impl<'a, T: Score + 'a> LockableScore<'a> for Mutex<T> {
+ type ScoreUpdate = T;
+ type ScoreLookUp = T;
-/// (C-not exported)
-impl<'a, T: 'a + Score> LockableScore<'a> for Mutex<T> {
- type Locked = MutexGuard<'a, T>;
+ type WriteLocked = MutexGuard<'a, Self::ScoreUpdate>;
+ type ReadLocked = MutexGuard<'a, Self::ScoreLookUp>;
- fn lock(&'a self) -> MutexGuard<'a, T> {
+ fn read_lock(&'a self) -> Self::ReadLocked {
+ Mutex::lock(self).unwrap()
+ }
+
+ fn write_lock(&'a self) -> Self::WriteLocked {
Mutex::lock(self).unwrap()
}
}
-impl<'a, T: 'a + Score> LockableScore<'a> for RefCell<T> {
- type Locked = RefMut<'a, T>;
+#[cfg(not(c_bindings))]
+impl<'a, T: Score + 'a> LockableScore<'a> for RefCell<T> {
+ type ScoreUpdate = T;
+ type ScoreLookUp = T;
+
+ type WriteLocked = RefMut<'a, Self::ScoreUpdate>;
+ type ReadLocked = Ref<'a, Self::ScoreLookUp>;
- fn lock(&'a self) -> RefMut<'a, T> {
+ fn write_lock(&'a self) -> Self::WriteLocked {
self.borrow_mut()
}
-}
-#[cfg(c_bindings)]
-/// A concrete implementation of [`LockableScore`] which supports multi-threading.
-pub struct MultiThreadedLockableScore<S: Score> {
- score: Mutex<S>,
-}
-#[cfg(c_bindings)]
-/// A locked `MultiThreadedLockableScore`.
-pub struct MultiThreadedScoreLock<'a, S: Score>(MutexGuard<'a, S>);
-#[cfg(c_bindings)]
-impl<'a, T: Score + 'a> Score for MultiThreadedScoreLock<'a, T> {
- fn channel_penalty_msat(&self, scid: u64, source: &NodeId, target: &NodeId, usage: ChannelUsage) -> u64 {
- self.0.channel_penalty_msat(scid, source, target, usage)
+ fn read_lock(&'a self) -> Self::ReadLocked {
+ self.borrow()
}
- fn payment_path_failed(&mut self, path: &[&RouteHop], short_channel_id: u64) {
- self.0.payment_path_failed(path, short_channel_id)
- }
- fn payment_path_successful(&mut self, path: &[&RouteHop]) {
- self.0.payment_path_successful(path)
- }
- fn probe_failed(&mut self, path: &[&RouteHop], short_channel_id: u64) {
- self.0.probe_failed(path, short_channel_id)
+}
+
+#[cfg(not(c_bindings))]
+impl<'a, T: Score + 'a> LockableScore<'a> for RwLock<T> {
+ type ScoreUpdate = T;
+ type ScoreLookUp = T;
+
+ type WriteLocked = RwLockWriteGuard<'a, Self::ScoreLookUp>;
+ type ReadLocked = RwLockReadGuard<'a, Self::ScoreUpdate>;
+
+ fn read_lock(&'a self) -> Self::ReadLocked {
+ RwLock::read(self).unwrap()
}
- fn probe_successful(&mut self, path: &[&RouteHop]) {
- self.0.probe_successful(path)
+
+ fn write_lock(&'a self) -> Self::WriteLocked {
+ RwLock::write(self).unwrap()
}
}
+
#[cfg(c_bindings)]
-impl<'a, T: Score + 'a> Writeable for MultiThreadedScoreLock<'a, T> {
- fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
- self.0.write(writer)
- }
+/// A concrete implementation of [`LockableScore`] which supports multi-threading.
+pub struct MultiThreadedLockableScore<T: Score> {
+ score: RwLock<T>,
}
#[cfg(c_bindings)]
impl<'a, T: Score + 'a> LockableScore<'a> for MultiThreadedLockableScore<T> {
- type Locked = MultiThreadedScoreLock<'a, T>;
+ type ScoreUpdate = T;
+ type ScoreLookUp = T;
+ type WriteLocked = MultiThreadedScoreLockWrite<'a, Self::ScoreUpdate>;
+ type ReadLocked = MultiThreadedScoreLockRead<'a, Self::ScoreLookUp>;
- fn lock(&'a self) -> MultiThreadedScoreLock<'a, T> {
- MultiThreadedScoreLock(Mutex::lock(&self.score).unwrap())
+ fn read_lock(&'a self) -> Self::ReadLocked {
+ MultiThreadedScoreLockRead(self.score.read().unwrap())
+ }
+
+ fn write_lock(&'a self) -> Self::WriteLocked {
+ MultiThreadedScoreLockWrite(self.score.write().unwrap())
}
}
#[cfg(c_bindings)]
impl<T: Score> Writeable for MultiThreadedLockableScore<T> {
fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
- self.lock().write(writer)
+ self.score.read().unwrap().write(writer)
}
}
impl<T: Score> MultiThreadedLockableScore<T> {
/// Creates a new [`MultiThreadedLockableScore`] given an underlying [`Score`].
pub fn new(score: T) -> Self {
- MultiThreadedLockableScore { score: Mutex::new(score) }
+ MultiThreadedLockableScore { score: RwLock::new(score) }
}
}
#[cfg(c_bindings)]
-/// (C-not exported)
-impl<'a, T: Writeable> Writeable for RefMut<'a, T> {
- fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
- T::write(&**self, writer)
+/// A locked `MultiThreadedLockableScore`.
+pub struct MultiThreadedScoreLockRead<'a, T: Score>(RwLockReadGuard<'a, T>);
+
+#[cfg(c_bindings)]
+/// A locked `MultiThreadedLockableScore`.
+pub struct MultiThreadedScoreLockWrite<'a, T: Score>(RwLockWriteGuard<'a, T>);
+
+#[cfg(c_bindings)]
+impl<'a, T: 'a + Score> Deref for MultiThreadedScoreLockRead<'a, T> {
+ type Target = T;
+
+ fn deref(&self) -> &Self::Target {
+ self.0.deref()
+ }
+}
+
+#[cfg(c_bindings)]
+impl<'a, T: Score> ScoreLookUp for MultiThreadedScoreLockRead<'a, T> {
+ type ScoreParams = T::ScoreParams;
+ fn channel_penalty_msat(&self, short_channel_id: u64, source: &NodeId,
+ target: &NodeId, usage: ChannelUsage, score_params: &Self::ScoreParams
+ ) -> u64 {
+ self.0.channel_penalty_msat(short_channel_id, source, target, usage, score_params)
}
}
#[cfg(c_bindings)]
-/// (C-not exported)
-impl<'a, S: Writeable> Writeable for MutexGuard<'a, S> {
+impl<'a, T: Score> Writeable for MultiThreadedScoreLockWrite<'a, T> {
fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
- S::write(&**self, writer)
+ self.0.write(writer)
+ }
+}
+
+#[cfg(c_bindings)]
+impl<'a, T: 'a + Score> Deref for MultiThreadedScoreLockWrite<'a, T> {
+ type Target = T;
+
+ fn deref(&self) -> &Self::Target {
+ self.0.deref()
+ }
+}
+
+#[cfg(c_bindings)]
+impl<'a, T: 'a + Score> DerefMut for MultiThreadedScoreLockWrite<'a, T> {
+ fn deref_mut(&mut self) -> &mut Self::Target {
+ self.0.deref_mut()
+ }
+}
+
+#[cfg(c_bindings)]
+impl<'a, T: Score> ScoreUpdate for MultiThreadedScoreLockWrite<'a, T> {
+ fn payment_path_failed(&mut self, path: &Path, short_channel_id: u64) {
+ self.0.payment_path_failed(path, short_channel_id)
+ }
+
+ fn payment_path_successful(&mut self, path: &Path) {
+ self.0.payment_path_successful(path)
+ }
+
+ fn probe_failed(&mut self, path: &Path, short_channel_id: u64) {
+ self.0.probe_failed(path, short_channel_id)
+ }
+
+ fn probe_successful(&mut self, path: &Path) {
+ self.0.probe_successful(path)
}
}
-/// Proposed use of a channel passed as a parameter to [`Score::channel_penalty_msat`].
-#[derive(Clone, Copy, Debug)]
+
+/// Proposed use of a channel passed as a parameter to [`ScoreLookUp::channel_penalty_msat`].
+#[derive(Clone, Copy, Debug, PartialEq)]
pub struct ChannelUsage {
/// The amount to send through the channel, denominated in millisatoshis.
pub amount_msat: u64,
}
#[derive(Clone)]
-/// [`Score`] implementation that uses a fixed penalty.
+/// [`ScoreLookUp`] implementation that uses a fixed penalty.
pub struct FixedPenaltyScorer {
penalty_msat: u64,
}
}
}
-impl Score for FixedPenaltyScorer {
- fn channel_penalty_msat(&self, _: u64, _: &NodeId, _: &NodeId, _: ChannelUsage) -> u64 {
+impl ScoreLookUp for FixedPenaltyScorer {
+ type ScoreParams = ();
+ fn channel_penalty_msat(&self, _: u64, _: &NodeId, _: &NodeId, _: ChannelUsage, _score_params: &Self::ScoreParams) -> u64 {
self.penalty_msat
}
+}
- fn payment_path_failed(&mut self, _path: &[&RouteHop], _short_channel_id: u64) {}
+impl ScoreUpdate for FixedPenaltyScorer {
+ fn payment_path_failed(&mut self, _path: &Path, _short_channel_id: u64) {}
- fn payment_path_successful(&mut self, _path: &[&RouteHop]) {}
+ fn payment_path_successful(&mut self, _path: &Path) {}
- fn probe_failed(&mut self, _path: &[&RouteHop], _short_channel_id: u64) {}
+ fn probe_failed(&mut self, _path: &Path, _short_channel_id: u64) {}
- fn probe_successful(&mut self, _path: &[&RouteHop]) {}
+ fn probe_successful(&mut self, _path: &Path) {}
}
impl Writeable for FixedPenaltyScorer {
}
#[cfg(not(feature = "no-std"))]
-type ConfiguredTime = std::time::Instant;
+type ConfiguredTime = crate::util::time::MonotonicTime;
#[cfg(feature = "no-std")]
use crate::util::time::Eternity;
#[cfg(feature = "no-std")]
type ConfiguredTime = Eternity;
-/// [`Score`] implementation using channel success probability distributions.
+/// [`ScoreLookUp`] implementation using channel success probability distributions.
///
/// Channels are tracked with upper and lower liquidity bounds - when an HTLC fails at a channel,
/// we learn that the upper-bound on the available liquidity is lower than the amount of the HTLC.
/// behavior.
///
/// [1]: https://arxiv.org/abs/2107.05322
-/// [`liquidity_penalty_multiplier_msat`]: ProbabilisticScoringParameters::liquidity_penalty_multiplier_msat
-/// [`liquidity_penalty_amount_multiplier_msat`]: ProbabilisticScoringParameters::liquidity_penalty_amount_multiplier_msat
-/// [`liquidity_offset_half_life`]: ProbabilisticScoringParameters::liquidity_offset_half_life
-/// [`historical_liquidity_penalty_multiplier_msat`]: ProbabilisticScoringParameters::historical_liquidity_penalty_multiplier_msat
-/// [`historical_liquidity_penalty_amount_multiplier_msat`]: ProbabilisticScoringParameters::historical_liquidity_penalty_amount_multiplier_msat
+/// [`liquidity_penalty_multiplier_msat`]: ProbabilisticScoringFeeParameters::liquidity_penalty_multiplier_msat
+/// [`liquidity_penalty_amount_multiplier_msat`]: ProbabilisticScoringFeeParameters::liquidity_penalty_amount_multiplier_msat
+/// [`liquidity_offset_half_life`]: ProbabilisticScoringDecayParameters::liquidity_offset_half_life
+/// [`historical_liquidity_penalty_multiplier_msat`]: ProbabilisticScoringFeeParameters::historical_liquidity_penalty_multiplier_msat
+/// [`historical_liquidity_penalty_amount_multiplier_msat`]: ProbabilisticScoringFeeParameters::historical_liquidity_penalty_amount_multiplier_msat
pub type ProbabilisticScorer<G, L> = ProbabilisticScorerUsingTime::<G, L, ConfiguredTime>;
-/// Probabilistic [`Score`] implementation.
+/// Probabilistic [`ScoreLookUp`] implementation.
///
-/// (C-not exported) generally all users should use the [`ProbabilisticScorer`] type alias.
+/// This is not exported to bindings users generally all users should use the [`ProbabilisticScorer`] type alias.
pub struct ProbabilisticScorerUsingTime<G: Deref<Target = NetworkGraph<L>>, L: Deref, T: Time>
where L::Target: Logger {
- params: ProbabilisticScoringParameters,
+ decay_params: ProbabilisticScoringDecayParameters,
network_graph: G,
logger: L,
// TODO: Remove entries of closed channels.
/// The penalty applied to any channel by the [`ProbabilisticScorer`] is the sum of each of the
/// parameters here.
#[derive(Clone)]
-pub struct ProbabilisticScoringParameters {
+pub struct ProbabilisticScoringFeeParameters {
/// A fixed penalty in msats to apply to each channel.
///
/// Default value: 500 msat
pub base_penalty_msat: u64,
- /// A multiplier used with the payment amount to calculate a fixed penalty applied to each
- /// channel, in excess of the [`base_penalty_msat`].
+ /// A multiplier used with the total amount flowing over a channel to calculate a fixed penalty
+ /// applied to each channel, in excess of the [`base_penalty_msat`].
///
/// The purpose of the amount penalty is to avoid having fees dominate the channel cost (i.e.,
/// fees plus penalty) for large payments. The penalty is computed as the product of this
- /// multiplier and `2^30`ths of the payment amount.
+ /// multiplier and `2^30`ths of the total amount flowing over a channel (i.e. the payment
+ /// amount plus the amount of any other HTLCs flowing we sent over the same channel).
///
/// ie `base_penalty_amount_multiplier_msat * amount_msat / 2^30`
///
///
/// Default value: 30,000 msat
///
- /// [`liquidity_offset_half_life`]: Self::liquidity_offset_half_life
+ /// [`liquidity_offset_half_life`]: ProbabilisticScoringDecayParameters::liquidity_offset_half_life
pub liquidity_penalty_multiplier_msat: u64,
- /// Whenever this amount of time elapses since the last update to a channel's liquidity bounds,
- /// the distance from the bounds to "zero" is cut in half. In other words, the lower-bound on
- /// the available liquidity is halved and the upper-bound moves half-way to the channel's total
- /// capacity.
- ///
- /// Because halving the liquidity bounds grows the uncertainty on the channel's liquidity,
- /// the penalty for an amount within the new bounds may change. See the [`ProbabilisticScorer`]
- /// struct documentation for more info on the way the liquidity bounds are used.
- ///
- /// For example, if the channel's capacity is 1 million sats, and the current upper and lower
- /// liquidity bounds are 200,000 sats and 600,000 sats, after this amount of time the upper
- /// and lower liquidity bounds will be decayed to 100,000 and 800,000 sats.
- ///
- /// Default value: 6 hours
- ///
- /// # Note
- ///
- /// When built with the `no-std` feature, time will never elapse. Therefore, the channel
- /// liquidity knowledge will never decay except when the bounds cross.
- pub liquidity_offset_half_life: Duration,
-
- /// A multiplier used in conjunction with a payment amount and the negative `log10` of the
- /// channel's success probability for the payment, as determined by our latest estimates of the
- /// channel's liquidity, to determine the amount penalty.
+ /// A multiplier used in conjunction with the total amount flowing over a channel and the
+ /// negative `log10` of the channel's success probability for the payment, as determined by our
+ /// latest estimates of the channel's liquidity, to determine the amount penalty.
///
/// The purpose of the amount penalty is to avoid having fees dominate the channel cost (i.e.,
/// fees plus penalty) for large payments. The penalty is computed as the product of this
- /// multiplier and `2^20`ths of the payment amount, weighted by the negative `log10` of the
- /// success probability.
+ /// multiplier and `2^20`ths of the amount flowing over this channel, weighted by the negative
+ /// `log10` of the success probability.
///
/// `-log10(success_probability) * liquidity_penalty_amount_multiplier_msat * amount_msat / 2^20`
///
/// [`liquidity_penalty_multiplier_msat`]: Self::liquidity_penalty_multiplier_msat
pub historical_liquidity_penalty_multiplier_msat: u64,
- /// A multiplier used in conjunction with the payment amount and the negative `log10` of the
- /// channel's success probability for the payment, as determined based on the history of our
- /// estimates of the channel's available liquidity, to determine a penalty.
+ /// A multiplier used in conjunction with the total amount flowing over a channel and the
+ /// negative `log10` of the channel's success probability for the payment, as determined based
+ /// on the history of our estimates of the channel's available liquidity, to determine a
+ /// penalty.
///
/// The purpose of the amount penalty is to avoid having fees dominate the channel cost for
- /// large payments. The penalty is computed as the product of this multiplier and the `2^20`ths
- /// of the payment amount, weighted by the negative `log10` of the success probability.
+ /// large payments. The penalty is computed as the product of this multiplier and `2^20`ths
+ /// of the amount flowing over this channel, weighted by the negative `log10` of the success
+ /// probability.
///
/// This penalty is similar to [`liquidity_penalty_amount_multiplier_msat`], however, instead
/// of using only our latest estimate for the current liquidity available in the channel, it
/// [`liquidity_penalty_amount_multiplier_msat`]: Self::liquidity_penalty_amount_multiplier_msat
pub historical_liquidity_penalty_amount_multiplier_msat: u64,
- /// If we aren't learning any new datapoints for a channel, the historical liquidity bounds
- /// tracking can simply live on with increasingly stale data. Instead, when a channel has not
- /// seen a liquidity estimate update for this amount of time, the historical datapoints are
- /// decayed by half.
- ///
- /// Note that after 16 or more half lives all historical data will be completely gone.
- ///
- /// Default value: 14 days
- pub historical_no_updates_half_life: Duration,
-
/// Manual penalties used for the given nodes. Allows to set a particular penalty for a given
/// node. Note that a manual penalty of `u64::max_value()` means the node would not ever be
/// considered during path finding.
///
- /// (C-not exported)
+ /// This is not exported to bindings users
pub manual_node_penalties: HashMap<NodeId, u64>,
/// This penalty is applied when `htlc_maximum_msat` is equal to or larger than half of the
- /// channel's capacity, which makes us prefer nodes with a smaller `htlc_maximum_msat`. We
- /// treat such nodes preferentially as this makes balance discovery attacks harder to execute,
- /// thereby creating an incentive to restrict `htlc_maximum_msat` and improve privacy.
+ /// channel's capacity, (ie. htlc_maximum_msat >= 0.5 * channel_capacity) which makes us
+ /// prefer nodes with a smaller `htlc_maximum_msat`. We treat such nodes preferentially
+ /// as this makes balance discovery attacks harder to execute, thereby creating an incentive
+ /// to restrict `htlc_maximum_msat` and improve privacy.
///
/// Default value: 250 msat
pub anti_probing_penalty_msat: u64,
- /// This penalty is applied when the amount we're attempting to send over a channel exceeds our
- /// current estimate of the channel's available liquidity.
+ /// This penalty is applied when the total amount flowing over a channel exceeds our current
+ /// estimate of the channel's available liquidity. The total amount is the amount of the
+ /// current HTLC plus any HTLCs which we've sent over the same channel.
///
/// Note that in this case all other penalties, including the
/// [`liquidity_penalty_multiplier_msat`] and [`liquidity_penalty_amount_multiplier_msat`]-based
/// [`base_penalty_msat`]: Self::base_penalty_msat
/// [`anti_probing_penalty_msat`]: Self::anti_probing_penalty_msat
pub considered_impossible_penalty_msat: u64,
+
+ /// In order to calculate most of the scores above, we must first convert a lower and upper
+ /// bound on the available liquidity in a channel into the probability that we think a payment
+ /// will succeed. That probability is derived from a Probability Density Function for where we
+ /// think the liquidity in a channel likely lies, given such bounds.
+ ///
+ /// If this flag is set, that PDF is simply a constant - we assume that the actual available
+ /// liquidity in a channel is just as likely to be at any point between our lower and upper
+ /// bounds.
+ ///
+ /// If this flag is *not* set, that PDF is `(x - 0.5*capacity) ^ 2`. That is, we use an
+ /// exponential curve which expects the liquidity of a channel to lie "at the edges". This
+ /// matches experimental results - most routing nodes do not aggressively rebalance their
+ /// channels and flows in the network are often unbalanced, leaving liquidity usually
+ /// unavailable.
+ ///
+ /// Thus, for the "best" routes, leave this flag `false`. However, the flag does imply a number
+ /// of floating-point multiplications in the hottest routing code, which may lead to routing
+ /// performance degradation on some machines.
+ ///
+ /// Default value: false
+ pub linear_success_probability: bool,
}
-/// Tracks the historical state of a distribution as a weighted average of how much time was spent
-/// in each of 8 buckets.
-#[derive(Clone, Copy)]
-struct HistoricalBucketRangeTracker {
- buckets: [u16; 8],
+impl Default for ProbabilisticScoringFeeParameters {
+ fn default() -> Self {
+ Self {
+ base_penalty_msat: 500,
+ base_penalty_amount_multiplier_msat: 8192,
+ liquidity_penalty_multiplier_msat: 30_000,
+ liquidity_penalty_amount_multiplier_msat: 192,
+ manual_node_penalties: HashMap::new(),
+ anti_probing_penalty_msat: 250,
+ considered_impossible_penalty_msat: 1_0000_0000_000,
+ historical_liquidity_penalty_multiplier_msat: 10_000,
+ historical_liquidity_penalty_amount_multiplier_msat: 64,
+ linear_success_probability: false,
+ }
+ }
}
-impl HistoricalBucketRangeTracker {
- fn new() -> Self { Self { buckets: [0; 8] } }
- fn track_datapoint(&mut self, bucket_idx: u8) {
- // We have 8 leaky buckets for min and max liquidity. Each bucket tracks the amount of time
- // we spend in each bucket as a 16-bit fixed-point number with a 5 bit fractional part.
- //
- // Each time we update our liquidity estimate, we add 32 (1.0 in our fixed-point system) to
- // the buckets for the current min and max liquidity offset positions.
- //
- // We then decay each bucket by multiplying by 2047/2048 (avoiding dividing by a
- // non-power-of-two). This ensures we can't actually overflow the u16 - when we get to
- // 63,457 adding 32 and decaying by 2047/2048 leaves us back at 63,457.
- //
- // In total, this allows us to track data for the last 8,000 or so payments across a given
- // channel.
- //
- // These constants are a balance - we try to fit in 2 bytes per bucket to reduce overhead,
- // and need to balance having more bits in the decimal part (to ensure decay isn't too
- // non-linear) with having too few bits in the mantissa, causing us to not store very many
- // datapoints.
- //
- // The constants were picked experimentally, selecting a decay amount that restricts us
- // from overflowing buckets without having to cap them manually.
- debug_assert!(bucket_idx < 8);
- if bucket_idx < 8 {
- for e in self.buckets.iter_mut() {
- *e = ((*e as u32) * 2047 / 2048) as u16;
- }
- self.buckets[bucket_idx as usize] = self.buckets[bucket_idx as usize].saturating_add(32);
+impl ProbabilisticScoringFeeParameters {
+ /// Marks the node with the given `node_id` as banned,
+ /// i.e it will be avoided during path finding.
+ pub fn add_banned(&mut self, node_id: &NodeId) {
+ self.manual_node_penalties.insert(*node_id, u64::max_value());
+ }
+
+ /// Marks all nodes in the given list as banned, i.e.,
+ /// they will be avoided during path finding.
+ pub fn add_banned_from_list(&mut self, node_ids: Vec<NodeId>) {
+ for id in node_ids {
+ self.manual_node_penalties.insert(id, u64::max_value());
}
}
- /// Decay all buckets by the given number of half-lives. Used to more aggressively remove old
- /// datapoints as we receive newer information.
- fn time_decay_data(&mut self, half_lives: u32) {
- for e in self.buckets.iter_mut() {
- *e = e.checked_shr(half_lives).unwrap_or(0);
+
+ /// Removes the node with the given `node_id` from the list of nodes to avoid.
+ pub fn remove_banned(&mut self, node_id: &NodeId) {
+ self.manual_node_penalties.remove(node_id);
+ }
+
+ /// Sets a manual penalty for the given node.
+ pub fn set_manual_penalty(&mut self, node_id: &NodeId, penalty: u64) {
+ self.manual_node_penalties.insert(*node_id, penalty);
+ }
+
+ /// Removes the node with the given `node_id` from the list of manual penalties.
+ pub fn remove_manual_penalty(&mut self, node_id: &NodeId) {
+ self.manual_node_penalties.remove(node_id);
+ }
+
+ /// Clears the list of manual penalties that are applied during path finding.
+ pub fn clear_manual_penalties(&mut self) {
+ self.manual_node_penalties = HashMap::new();
+ }
+}
+
+#[cfg(test)]
+impl ProbabilisticScoringFeeParameters {
+ fn zero_penalty() -> Self {
+ Self {
+ base_penalty_msat: 0,
+ base_penalty_amount_multiplier_msat: 0,
+ liquidity_penalty_multiplier_msat: 0,
+ liquidity_penalty_amount_multiplier_msat: 0,
+ historical_liquidity_penalty_multiplier_msat: 0,
+ historical_liquidity_penalty_amount_multiplier_msat: 0,
+ manual_node_penalties: HashMap::new(),
+ anti_probing_penalty_msat: 0,
+ considered_impossible_penalty_msat: 0,
+ linear_success_probability: true,
}
}
}
-impl_writeable_tlv_based!(HistoricalBucketRangeTracker, { (0, buckets, required) });
+/// Parameters for configuring [`ProbabilisticScorer`].
+///
+/// Used to configure decay parameters that are static throughout the lifetime of the scorer.
+/// these decay parameters affect the score of the channel penalty and are not changed on a
+/// per-route penalty cost call.
+#[derive(Copy, Clone)]
+pub struct ProbabilisticScoringDecayParameters {
+ /// If we aren't learning any new datapoints for a channel, the historical liquidity bounds
+ /// tracking can simply live on with increasingly stale data. Instead, when a channel has not
+ /// seen a liquidity estimate update for this amount of time, the historical datapoints are
+ /// decayed by half.
+ /// For an example of historical_no_updates_half_life being used see [`historical_estimated_channel_liquidity_probabilities`]
+ ///
+ /// Note that after 16 or more half lives all historical data will be completely gone.
+ ///
+ /// Default value: 14 days
+ ///
+ /// [`historical_estimated_channel_liquidity_probabilities`]: ProbabilisticScorerUsingTime::historical_estimated_channel_liquidity_probabilities
+ pub historical_no_updates_half_life: Duration,
-struct HistoricalMinMaxBuckets<'a> {
- min_liquidity_offset_history: &'a HistoricalBucketRangeTracker,
- max_liquidity_offset_history: &'a HistoricalBucketRangeTracker,
+ /// Whenever this amount of time elapses since the last update to a channel's liquidity bounds,
+ /// the distance from the bounds to "zero" is cut in half. In other words, the lower-bound on
+ /// the available liquidity is halved and the upper-bound moves half-way to the channel's total
+ /// capacity.
+ ///
+ /// Because halving the liquidity bounds grows the uncertainty on the channel's liquidity,
+ /// the penalty for an amount within the new bounds may change. See the [`ProbabilisticScorer`]
+ /// struct documentation for more info on the way the liquidity bounds are used.
+ ///
+ /// For example, if the channel's capacity is 1 million sats, and the current upper and lower
+ /// liquidity bounds are 200,000 sats and 600,000 sats, after this amount of time the upper
+ /// and lower liquidity bounds will be decayed to 100,000 and 800,000 sats.
+ ///
+ /// Default value: 6 hours
+ ///
+ /// # Note
+ ///
+ /// When built with the `no-std` feature, time will never elapse. Therefore, the channel
+ /// liquidity knowledge will never decay except when the bounds cross.
+ pub liquidity_offset_half_life: Duration,
}
-impl HistoricalMinMaxBuckets<'_> {
- #[inline]
- fn calculate_success_probability_times_billion(&self, required_decays: u32, payment_amt_64th_bucket: u8) -> Option<u64> {
- // If historical penalties are enabled, calculate the penalty by walking the set of
- // historical liquidity bucket (min, max) combinations (where min_idx < max_idx) and, for
- // each, calculate the probability of success given our payment amount, then total the
- // weighted average probability of success.
- //
- // We use a sliding scale to decide which point within a given bucket will be compared to
- // the amount being sent - for lower-bounds, the amount being sent is compared to the lower
- // edge of the first bucket (i.e. zero), but compared to the upper 7/8ths of the last
- // bucket (i.e. 9 times the index, or 63), with each bucket in between increasing the
- // comparison point by 1/64th. For upper-bounds, the same applies, however with an offset
- // of 1/64th (i.e. starting at one and ending at 64). This avoids failing to assign
- // penalties to channels at the edges.
- //
- // If we used the bottom edge of buckets, we'd end up never assigning any penalty at all to
- // such a channel when sending less than ~0.19% of the channel's capacity (e.g. ~200k sats
- // for a 1 BTC channel!).
- //
- // If we used the middle of each bucket we'd never assign any penalty at all when sending
- // less than 1/16th of a channel's capacity, or 1/8th if we used the top of the bucket.
- let mut total_valid_points_tracked = 0;
-
- // Rather than actually decaying the individual buckets, which would lose precision, we
- // simply track whether all buckets would be decayed to zero, in which case we treat it as
- // if we had no data.
- let mut is_fully_decayed = true;
- let mut check_track_bucket_contains_undecayed_points =
- |bucket_val: u16| if bucket_val.checked_shr(required_decays).unwrap_or(0) > 0 { is_fully_decayed = false; };
-
- for (min_idx, min_bucket) in self.min_liquidity_offset_history.buckets.iter().enumerate() {
- check_track_bucket_contains_undecayed_points(*min_bucket);
- for max_bucket in self.max_liquidity_offset_history.buckets.iter().take(8 - min_idx) {
- total_valid_points_tracked += (*min_bucket as u64) * (*max_bucket as u64);
- check_track_bucket_contains_undecayed_points(*max_bucket);
- }
- }
- // If the total valid points is smaller than 1.0 (i.e. 32 in our fixed-point scheme), treat
- // it as if we were fully decayed.
- if total_valid_points_tracked.checked_shr(required_decays).unwrap_or(0) < 32*32 || is_fully_decayed {
- return None;
+impl Default for ProbabilisticScoringDecayParameters {
+ fn default() -> Self {
+ Self {
+ liquidity_offset_half_life: Duration::from_secs(6 * 60 * 60),
+ historical_no_updates_half_life: Duration::from_secs(60 * 60 * 24 * 14),
}
+ }
+}
- let mut cumulative_success_prob_times_billion = 0;
- for (min_idx, min_bucket) in self.min_liquidity_offset_history.buckets.iter().enumerate() {
- for (max_idx, max_bucket) in self.max_liquidity_offset_history.buckets.iter().enumerate().take(8 - min_idx) {
- let bucket_prob_times_million = (*min_bucket as u64) * (*max_bucket as u64)
- * 1024 * 1024 / total_valid_points_tracked;
- let min_64th_bucket = min_idx as u8 * 9;
- let max_64th_bucket = (7 - max_idx as u8) * 9 + 1;
- if payment_amt_64th_bucket > max_64th_bucket {
- // Success probability 0, the payment amount is above the max liquidity
- } else if payment_amt_64th_bucket <= min_64th_bucket {
- cumulative_success_prob_times_billion += bucket_prob_times_million * 1024;
- } else {
- cumulative_success_prob_times_billion += bucket_prob_times_million *
- ((max_64th_bucket - payment_amt_64th_bucket) as u64) * 1024 /
- ((max_64th_bucket - min_64th_bucket) as u64);
- }
- }
+#[cfg(test)]
+impl ProbabilisticScoringDecayParameters {
+ fn zero_penalty() -> Self {
+ Self {
+ liquidity_offset_half_life: Duration::from_secs(6 * 60 * 60),
+ historical_no_updates_half_life: Duration::from_secs(60 * 60 * 24 * 14),
}
-
- Some(cumulative_success_prob_times_billion)
}
}
/// A snapshot of [`ChannelLiquidity`] in one direction assuming a certain channel capacity and
/// decayed with a given half life.
-struct DirectedChannelLiquidity<'a, L: Deref<Target = u64>, BRT: Deref<Target = HistoricalBucketRangeTracker>, T: Time, U: Deref<Target = T>> {
+struct DirectedChannelLiquidity<L: Deref<Target = u64>, BRT: Deref<Target = HistoricalBucketRangeTracker>, T: Time, U: Deref<Target = T>> {
min_liquidity_offset_msat: L,
max_liquidity_offset_msat: L,
- min_liquidity_offset_history: BRT,
- max_liquidity_offset_history: BRT,
+ liquidity_history: HistoricalMinMaxBuckets<BRT>,
capacity_msat: u64,
last_updated: U,
now: T,
- params: &'a ProbabilisticScoringParameters,
+ decay_params: ProbabilisticScoringDecayParameters,
}
impl<G: Deref<Target = NetworkGraph<L>>, L: Deref, T: Time> ProbabilisticScorerUsingTime<G, L, T> where L::Target: Logger {
/// Creates a new scorer using the given scoring parameters for sending payments from a node
/// through a network graph.
- pub fn new(params: ProbabilisticScoringParameters, network_graph: G, logger: L) -> Self {
+ pub fn new(decay_params: ProbabilisticScoringDecayParameters, network_graph: G, logger: L) -> Self {
Self {
- params,
+ decay_params,
network_graph,
logger,
channel_liquidities: HashMap::new(),
/// Note that this writes roughly one line per channel for which we have a liquidity estimate,
/// which may be a substantial amount of log output.
pub fn debug_log_liquidity_stats(&self) {
+ let now = T::now();
+
let graph = self.network_graph.read_only();
for (scid, liq) in self.channel_liquidities.iter() {
if let Some(chan_debug) = graph.channels().get(scid) {
let log_direction = |source, target| {
if let Some((directed_info, _)) = chan_debug.as_directed_to(target) {
let amt = directed_info.effective_capacity().as_msat();
- let dir_liq = liq.as_directed(source, target, amt, &self.params);
- log_debug!(self.logger, "Liquidity from {:?} to {:?} via {} is in the range ({}, {})",
- source, target, scid, dir_liq.min_liquidity_msat(), dir_liq.max_liquidity_msat());
+ let dir_liq = liq.as_directed(source, target, amt, self.decay_params);
+
+ let (min_buckets, max_buckets) = dir_liq.liquidity_history
+ .get_decayed_buckets(now, *dir_liq.last_updated,
+ self.decay_params.historical_no_updates_half_life)
+ .unwrap_or(([0; 32], [0; 32]));
+
+ log_debug!(self.logger, core::concat!(
+ "Liquidity from {} to {} via {} is in the range ({}, {}).\n",
+ "\tHistorical min liquidity bucket relative probabilities:\n",
+ "\t\t{} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {}\n",
+ "\tHistorical max liquidity bucket relative probabilities:\n",
+ "\t\t{} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {} {}"),
+ source, target, scid, dir_liq.min_liquidity_msat(), dir_liq.max_liquidity_msat(),
+ min_buckets[ 0], min_buckets[ 1], min_buckets[ 2], min_buckets[ 3],
+ min_buckets[ 4], min_buckets[ 5], min_buckets[ 6], min_buckets[ 7],
+ min_buckets[ 8], min_buckets[ 9], min_buckets[10], min_buckets[11],
+ min_buckets[12], min_buckets[13], min_buckets[14], min_buckets[15],
+ min_buckets[16], min_buckets[17], min_buckets[18], min_buckets[19],
+ min_buckets[20], min_buckets[21], min_buckets[22], min_buckets[23],
+ min_buckets[24], min_buckets[25], min_buckets[26], min_buckets[27],
+ min_buckets[28], min_buckets[29], min_buckets[30], min_buckets[31],
+ // Note that the liquidity buckets are an offset from the edge, so we
+ // inverse the max order to get the probabilities from zero.
+ max_buckets[31], max_buckets[30], max_buckets[29], max_buckets[28],
+ max_buckets[27], max_buckets[26], max_buckets[25], max_buckets[24],
+ max_buckets[23], max_buckets[22], max_buckets[21], max_buckets[20],
+ max_buckets[19], max_buckets[18], max_buckets[17], max_buckets[16],
+ max_buckets[15], max_buckets[14], max_buckets[13], max_buckets[12],
+ max_buckets[11], max_buckets[10], max_buckets[ 9], max_buckets[ 8],
+ max_buckets[ 7], max_buckets[ 6], max_buckets[ 5], max_buckets[ 4],
+ max_buckets[ 3], max_buckets[ 2], max_buckets[ 1], max_buckets[ 0]);
} else {
log_debug!(self.logger, "No amount known for SCID {} from {:?} to {:?}", scid, source, target);
}
if let Some(liq) = self.channel_liquidities.get(&scid) {
if let Some((directed_info, source)) = chan.as_directed_to(target) {
let amt = directed_info.effective_capacity().as_msat();
- let dir_liq = liq.as_directed(source, target, amt, &self.params);
+ let dir_liq = liq.as_directed(source, target, amt, self.decay_params);
return Some((dir_liq.min_liquidity_msat(), dir_liq.max_liquidity_msat()));
}
}
None
}
- /// Marks the node with the given `node_id` as banned, i.e.,
- /// it will be avoided during path finding.
- pub fn add_banned(&mut self, node_id: &NodeId) {
- self.params.manual_node_penalties.insert(*node_id, u64::max_value());
- }
-
- /// Removes the node with the given `node_id` from the list of nodes to avoid.
- pub fn remove_banned(&mut self, node_id: &NodeId) {
- self.params.manual_node_penalties.remove(node_id);
- }
-
- /// Sets a manual penalty for the given node.
- pub fn set_manual_penalty(&mut self, node_id: &NodeId, penalty: u64) {
- self.params.manual_node_penalties.insert(*node_id, penalty);
- }
-
- /// Removes the node with the given `node_id` from the list of manual penalties.
- pub fn remove_manual_penalty(&mut self, node_id: &NodeId) {
- self.params.manual_node_penalties.remove(node_id);
- }
-
- /// Clears the list of manual penalties that are applied during path finding.
- pub fn clear_manual_penalties(&mut self) {
- self.params.manual_node_penalties = HashMap::new();
- }
-}
+ /// Query the historical estimated minimum and maximum liquidity available for sending a
+ /// payment over the channel with `scid` towards the given `target` node.
+ ///
+ /// Returns two sets of 32 buckets. The first set describes the lower-bound liquidity history,
+ /// the second set describes the upper-bound liquidity history. Each bucket describes the
+ /// relative frequency at which we've seen a liquidity bound in the bucket's range relative to
+ /// the channel's total capacity, on an arbitrary scale. Because the values are slowly decayed,
+ /// more recent data points are weighted more heavily than older datapoints.
+ ///
+ /// Note that the range of each bucket varies by its location to provide more granular results
+ /// at the edges of a channel's capacity, where it is more likely to sit.
+ ///
+ /// When scoring, the estimated probability that an upper-/lower-bound lies in a given bucket
+ /// is calculated by dividing that bucket's value with the total value of all buckets.
+ ///
+ /// For example, using a lower bucket count for illustrative purposes, a value of
+ /// `[0, 0, 0, ..., 0, 32]` indicates that we believe the probability of a bound being very
+ /// close to the channel's capacity to be 100%, and have never (recently) seen it in any other
+ /// bucket. A value of `[31, 0, 0, ..., 0, 0, 32]` indicates we've seen the bound being both
+ /// in the top and bottom bucket, and roughly with similar (recent) frequency.
+ ///
+ /// Because the datapoints are decayed slowly over time, values will eventually return to
+ /// `Some(([1; 32], [1; 32]))` and then to `None` once no datapoints remain.
+ ///
+ /// In order to fetch a single success probability from the buckets provided here, as used in
+ /// the scoring model, see [`Self::historical_estimated_payment_success_probability`].
+ pub fn historical_estimated_channel_liquidity_probabilities(&self, scid: u64, target: &NodeId)
+ -> Option<([u16; 32], [u16; 32])> {
+ let graph = self.network_graph.read_only();
-impl ProbabilisticScoringParameters {
- #[cfg(test)]
- fn zero_penalty() -> Self {
- Self {
- base_penalty_msat: 0,
- base_penalty_amount_multiplier_msat: 0,
- liquidity_penalty_multiplier_msat: 0,
- liquidity_offset_half_life: Duration::from_secs(6 * 60 * 60),
- liquidity_penalty_amount_multiplier_msat: 0,
- historical_liquidity_penalty_multiplier_msat: 0,
- historical_liquidity_penalty_amount_multiplier_msat: 0,
- historical_no_updates_half_life: Duration::from_secs(60 * 60 * 24 * 14),
- manual_node_penalties: HashMap::new(),
- anti_probing_penalty_msat: 0,
- considered_impossible_penalty_msat: 0,
+ if let Some(chan) = graph.channels().get(&scid) {
+ if let Some(liq) = self.channel_liquidities.get(&scid) {
+ if let Some((directed_info, source)) = chan.as_directed_to(target) {
+ let amt = directed_info.effective_capacity().as_msat();
+ let dir_liq = liq.as_directed(source, target, amt, self.decay_params);
+
+ let (min_buckets, mut max_buckets) =
+ dir_liq.liquidity_history.get_decayed_buckets(
+ dir_liq.now, *dir_liq.last_updated,
+ self.decay_params.historical_no_updates_half_life
+ )?;
+
+ // Note that the liquidity buckets are an offset from the edge, so we inverse
+ // the max order to get the probabilities from zero.
+ max_buckets.reverse();
+ return Some((min_buckets, max_buckets));
+ }
+ }
}
+ None
}
- /// Marks all nodes in the given list as banned, i.e.,
- /// they will be avoided during path finding.
- pub fn add_banned_from_list(&mut self, node_ids: Vec<NodeId>) {
- for id in node_ids {
- self.manual_node_penalties.insert(id, u64::max_value());
- }
- }
-}
+ /// Query the probability of payment success sending the given `amount_msat` over the channel
+ /// with `scid` towards the given `target` node, based on the historical estimated liquidity
+ /// bounds.
+ ///
+ /// These are the same bounds as returned by
+ /// [`Self::historical_estimated_channel_liquidity_probabilities`] (but not those returned by
+ /// [`Self::estimated_channel_liquidity_range`]).
+ pub fn historical_estimated_payment_success_probability(
+ &self, scid: u64, target: &NodeId, amount_msat: u64, params: &ProbabilisticScoringFeeParameters)
+ -> Option<f64> {
+ let graph = self.network_graph.read_only();
-impl Default for ProbabilisticScoringParameters {
- fn default() -> Self {
- Self {
- base_penalty_msat: 500,
- base_penalty_amount_multiplier_msat: 8192,
- liquidity_penalty_multiplier_msat: 30_000,
- liquidity_offset_half_life: Duration::from_secs(6 * 60 * 60),
- liquidity_penalty_amount_multiplier_msat: 192,
- historical_liquidity_penalty_multiplier_msat: 10_000,
- historical_liquidity_penalty_amount_multiplier_msat: 64,
- historical_no_updates_half_life: Duration::from_secs(60 * 60 * 24 * 14),
- manual_node_penalties: HashMap::new(),
- anti_probing_penalty_msat: 250,
- considered_impossible_penalty_msat: 1_0000_0000_000,
+ if let Some(chan) = graph.channels().get(&scid) {
+ if let Some(liq) = self.channel_liquidities.get(&scid) {
+ if let Some((directed_info, source)) = chan.as_directed_to(target) {
+ let capacity_msat = directed_info.effective_capacity().as_msat();
+ let dir_liq = liq.as_directed(source, target, capacity_msat, self.decay_params);
+
+ return dir_liq.liquidity_history.calculate_success_probability_times_billion(
+ dir_liq.now, *dir_liq.last_updated,
+ self.decay_params.historical_no_updates_half_life, ¶ms, amount_msat,
+ capacity_msat
+ ).map(|p| p as f64 / (1024 * 1024 * 1024) as f64);
+ }
+ }
}
+ None
}
}
/// Returns a view of the channel liquidity directed from `source` to `target` assuming
/// `capacity_msat`.
- fn as_directed<'a>(
- &self, source: &NodeId, target: &NodeId, capacity_msat: u64, params: &'a ProbabilisticScoringParameters
- ) -> DirectedChannelLiquidity<'a, &u64, &HistoricalBucketRangeTracker, T, &T> {
+ fn as_directed(
+ &self, source: &NodeId, target: &NodeId, capacity_msat: u64, decay_params: ProbabilisticScoringDecayParameters
+ ) -> DirectedChannelLiquidity<&u64, &HistoricalBucketRangeTracker, T, &T> {
let (min_liquidity_offset_msat, max_liquidity_offset_msat, min_liquidity_offset_history, max_liquidity_offset_history) =
if source < target {
(&self.min_liquidity_offset_msat, &self.max_liquidity_offset_msat,
DirectedChannelLiquidity {
min_liquidity_offset_msat,
max_liquidity_offset_msat,
- min_liquidity_offset_history,
- max_liquidity_offset_history,
+ liquidity_history: HistoricalMinMaxBuckets {
+ min_liquidity_offset_history,
+ max_liquidity_offset_history,
+ },
capacity_msat,
last_updated: &self.last_updated,
now: T::now(),
- params,
+ decay_params: decay_params,
}
}
/// Returns a mutable view of the channel liquidity directed from `source` to `target` assuming
/// `capacity_msat`.
- fn as_directed_mut<'a>(
- &mut self, source: &NodeId, target: &NodeId, capacity_msat: u64, params: &'a ProbabilisticScoringParameters
- ) -> DirectedChannelLiquidity<'a, &mut u64, &mut HistoricalBucketRangeTracker, T, &mut T> {
+ fn as_directed_mut(
+ &mut self, source: &NodeId, target: &NodeId, capacity_msat: u64, decay_params: ProbabilisticScoringDecayParameters
+ ) -> DirectedChannelLiquidity<&mut u64, &mut HistoricalBucketRangeTracker, T, &mut T> {
let (min_liquidity_offset_msat, max_liquidity_offset_msat, min_liquidity_offset_history, max_liquidity_offset_history) =
if source < target {
(&mut self.min_liquidity_offset_msat, &mut self.max_liquidity_offset_msat,
DirectedChannelLiquidity {
min_liquidity_offset_msat,
max_liquidity_offset_msat,
- min_liquidity_offset_history,
- max_liquidity_offset_history,
+ liquidity_history: HistoricalMinMaxBuckets {
+ min_liquidity_offset_history,
+ max_liquidity_offset_history,
+ },
capacity_msat,
last_updated: &mut self.last_updated,
now: T::now(),
- params,
+ decay_params: decay_params,
}
}
}
const AMOUNT_PENALTY_DIVISOR: u64 = 1 << 20;
const BASE_AMOUNT_PENALTY_DIVISOR: u64 = 1 << 30;
-impl<L: Deref<Target = u64>, BRT: Deref<Target = HistoricalBucketRangeTracker>, T: Time, U: Deref<Target = T>> DirectedChannelLiquidity<'_, L, BRT, T, U> {
+/// Raises three `f64`s to the 3rd power, without `powi` because it requires `std` (dunno why).
+#[inline(always)]
+fn three_f64_pow_3(a: f64, b: f64, c: f64) -> (f64, f64, f64) {
+ (a * a * a, b * b * b, c * c * c)
+}
+
+/// Given liquidity bounds, calculates the success probability (in the form of a numerator and
+/// denominator) of an HTLC. This is a key assumption in our scoring models.
+///
+/// Must not return a numerator or denominator greater than 2^31 for arguments less than 2^31.
+///
+/// min_zero_implies_no_successes signals that a `min_liquidity_msat` of 0 means we've not
+/// (recently) seen an HTLC successfully complete over this channel.
+#[inline(always)]
+fn success_probability(
+ amount_msat: u64, min_liquidity_msat: u64, max_liquidity_msat: u64, capacity_msat: u64,
+ params: &ProbabilisticScoringFeeParameters, min_zero_implies_no_successes: bool,
+) -> (u64, u64) {
+ debug_assert!(min_liquidity_msat <= amount_msat);
+ debug_assert!(amount_msat < max_liquidity_msat);
+ debug_assert!(max_liquidity_msat <= capacity_msat);
+
+ let (numerator, mut denominator) =
+ if params.linear_success_probability {
+ (max_liquidity_msat - amount_msat,
+ (max_liquidity_msat - min_liquidity_msat).saturating_add(1))
+ } else {
+ let capacity = capacity_msat as f64;
+ let min = (min_liquidity_msat as f64) / capacity;
+ let max = (max_liquidity_msat as f64) / capacity;
+ let amount = (amount_msat as f64) / capacity;
+
+ // Assume the channel has a probability density function of (x - 0.5)^2 for values from
+ // 0 to 1 (where 1 is the channel's full capacity). The success probability given some
+ // liquidity bounds is thus the integral under the curve from the amount to maximum
+ // estimated liquidity, divided by the same integral from the minimum to the maximum
+ // estimated liquidity bounds.
+ //
+ // Because the integral from x to y is simply (y - 0.5)^3 - (x - 0.5)^3, we can
+ // calculate the cumulative density function between the min/max bounds trivially. Note
+ // that we don't bother to normalize the CDF to total to 1, as it will come out in the
+ // division of num / den.
+ let (max_pow, amt_pow, min_pow) = three_f64_pow_3(max - 0.5, amount - 0.5, min - 0.5);
+ let num = max_pow - amt_pow;
+ let den = max_pow - min_pow;
+
+ // Because our numerator and denominator max out at 0.5^3 we need to multiply them by
+ // quite a large factor to get something useful (ideally in the 2^30 range).
+ const BILLIONISH: f64 = 1024.0 * 1024.0 * 1024.0;
+ let numerator = (num * BILLIONISH) as u64 + 1;
+ let denominator = (den * BILLIONISH) as u64 + 1;
+ debug_assert!(numerator <= 1 << 30, "Got large numerator ({}) from float {}.", numerator, num);
+ debug_assert!(denominator <= 1 << 30, "Got large denominator ({}) from float {}.", denominator, den);
+ (numerator, denominator)
+ };
+
+ if min_zero_implies_no_successes && min_liquidity_msat == 0 &&
+ denominator < u64::max_value() / 21
+ {
+ // If we have no knowledge of the channel, scale probability down by ~75%
+ // Note that we prefer to increase the denominator rather than decrease the numerator as
+ // the denominator is more likely to be larger and thus provide greater precision. This is
+ // mostly an overoptimization but makes a large difference in tests.
+ denominator = denominator * 21 / 16
+ }
+
+ (numerator, denominator)
+}
+
+impl<L: Deref<Target = u64>, BRT: Deref<Target = HistoricalBucketRangeTracker>, T: Time, U: Deref<Target = T>> DirectedChannelLiquidity< L, BRT, T, U> {
/// Returns a liquidity penalty for routing the given HTLC `amount_msat` through the channel in
/// this direction.
- fn penalty_msat(&self, amount_msat: u64, params: &ProbabilisticScoringParameters) -> u64 {
+ fn penalty_msat(&self, amount_msat: u64, score_params: &ProbabilisticScoringFeeParameters) -> u64 {
+ let available_capacity = self.capacity_msat;
let max_liquidity_msat = self.max_liquidity_msat();
let min_liquidity_msat = core::cmp::min(self.min_liquidity_msat(), max_liquidity_msat);
// impossibility penalty.
let negative_log10_times_2048 = NEGATIVE_LOG10_UPPER_BOUND * 2048;
Self::combined_penalty_msat(amount_msat, negative_log10_times_2048,
- params.liquidity_penalty_multiplier_msat,
- params.liquidity_penalty_amount_multiplier_msat)
- .saturating_add(params.considered_impossible_penalty_msat)
+ score_params.liquidity_penalty_multiplier_msat,
+ score_params.liquidity_penalty_amount_multiplier_msat)
+ .saturating_add(score_params.considered_impossible_penalty_msat)
} else {
- let numerator = (max_liquidity_msat - amount_msat).saturating_add(1);
- let denominator = (max_liquidity_msat - min_liquidity_msat).saturating_add(1);
- if amount_msat - min_liquidity_msat < denominator / PRECISION_LOWER_BOUND_DENOMINATOR {
+ let (numerator, denominator) = success_probability(amount_msat,
+ min_liquidity_msat, max_liquidity_msat, available_capacity, score_params, false);
+ if denominator - numerator < denominator / PRECISION_LOWER_BOUND_DENOMINATOR {
// If the failure probability is < 1.5625% (as 1 - numerator/denominator < 1/64),
// don't bother trying to use the log approximation as it gets too noisy to be
// particularly helpful, instead just round down to 0.
let negative_log10_times_2048 =
approx::negative_log10_times_2048(numerator, denominator);
Self::combined_penalty_msat(amount_msat, negative_log10_times_2048,
- params.liquidity_penalty_multiplier_msat,
- params.liquidity_penalty_amount_multiplier_msat)
+ score_params.liquidity_penalty_multiplier_msat,
+ score_params.liquidity_penalty_amount_multiplier_msat)
}
};
- if params.historical_liquidity_penalty_multiplier_msat != 0 ||
- params.historical_liquidity_penalty_amount_multiplier_msat != 0 {
- let required_decays = self.now.duration_since(*self.last_updated).as_secs()
- .checked_div(params.historical_no_updates_half_life.as_secs())
- .map_or(u32::max_value(), |decays| cmp::min(decays, u32::max_value() as u64) as u32);
- let payment_amt_64th_bucket = amount_msat * 64 / self.capacity_msat;
- debug_assert!(payment_amt_64th_bucket <= 64);
- if payment_amt_64th_bucket > 64 { return res; }
+ if amount_msat >= available_capacity {
+ // We're trying to send more than the capacity, use a max penalty.
+ res = res.saturating_add(Self::combined_penalty_msat(amount_msat,
+ NEGATIVE_LOG10_UPPER_BOUND * 2048,
+ score_params.historical_liquidity_penalty_multiplier_msat,
+ score_params.historical_liquidity_penalty_amount_multiplier_msat));
+ return res;
+ }
- let buckets = HistoricalMinMaxBuckets {
- min_liquidity_offset_history: &self.min_liquidity_offset_history,
- max_liquidity_offset_history: &self.max_liquidity_offset_history,
- };
- if let Some(cumulative_success_prob_times_billion) = buckets
- .calculate_success_probability_times_billion(required_decays, payment_amt_64th_bucket as u8) {
+ if score_params.historical_liquidity_penalty_multiplier_msat != 0 ||
+ score_params.historical_liquidity_penalty_amount_multiplier_msat != 0 {
+ if let Some(cumulative_success_prob_times_billion) = self.liquidity_history
+ .calculate_success_probability_times_billion(self.now, *self.last_updated,
+ self.decay_params.historical_no_updates_half_life, score_params, amount_msat,
+ self.capacity_msat)
+ {
let historical_negative_log10_times_2048 = approx::negative_log10_times_2048(cumulative_success_prob_times_billion + 1, 1024 * 1024 * 1024);
res = res.saturating_add(Self::combined_penalty_msat(amount_msat,
- historical_negative_log10_times_2048, params.historical_liquidity_penalty_multiplier_msat,
- params.historical_liquidity_penalty_amount_multiplier_msat));
+ historical_negative_log10_times_2048, score_params.historical_liquidity_penalty_multiplier_msat,
+ score_params.historical_liquidity_penalty_amount_multiplier_msat));
} else {
// If we don't have any valid points (or, once decayed, we have less than a full
// point), redo the non-historical calculation with no liquidity bounds tracked and
// the historical penalty multipliers.
- let max_capacity = self.capacity_msat.saturating_sub(amount_msat).saturating_add(1);
+ let (numerator, denominator) = success_probability(amount_msat, 0,
+ available_capacity, available_capacity, score_params, true);
let negative_log10_times_2048 =
- approx::negative_log10_times_2048(max_capacity, self.capacity_msat.saturating_add(1));
+ approx::negative_log10_times_2048(numerator, denominator);
res = res.saturating_add(Self::combined_penalty_msat(amount_msat, negative_log10_times_2048,
- params.historical_liquidity_penalty_multiplier_msat,
- params.historical_liquidity_penalty_amount_multiplier_msat));
- return res;
+ score_params.historical_liquidity_penalty_multiplier_msat,
+ score_params.historical_liquidity_penalty_amount_multiplier_msat));
}
}
/// Computes the liquidity penalty from the penalty multipliers.
#[inline(always)]
- fn combined_penalty_msat(amount_msat: u64, negative_log10_times_2048: u64,
+ fn combined_penalty_msat(amount_msat: u64, mut negative_log10_times_2048: u64,
liquidity_penalty_multiplier_msat: u64, liquidity_penalty_amount_multiplier_msat: u64,
) -> u64 {
- let liquidity_penalty_msat = {
- // Upper bound the liquidity penalty to ensure some channel is selected.
- let multiplier_msat = liquidity_penalty_multiplier_msat;
- let max_penalty_msat = multiplier_msat.saturating_mul(NEGATIVE_LOG10_UPPER_BOUND);
- (negative_log10_times_2048.saturating_mul(multiplier_msat) / 2048).min(max_penalty_msat)
- };
+ negative_log10_times_2048 =
+ negative_log10_times_2048.min(NEGATIVE_LOG10_UPPER_BOUND * 2048);
+
+ // Upper bound the liquidity penalty to ensure some channel is selected.
+ let liquidity_penalty_msat = negative_log10_times_2048
+ .saturating_mul(liquidity_penalty_multiplier_msat) / 2048;
let amount_penalty_msat = negative_log10_times_2048
.saturating_mul(liquidity_penalty_amount_multiplier_msat)
.saturating_mul(amount_msat) / 2048 / AMOUNT_PENALTY_DIVISOR;
}
/// Returns the lower bound of the channel liquidity balance in this direction.
+ #[inline(always)]
fn min_liquidity_msat(&self) -> u64 {
self.decayed_offset_msat(*self.min_liquidity_offset_msat)
}
/// Returns the upper bound of the channel liquidity balance in this direction.
+ #[inline(always)]
fn max_liquidity_msat(&self) -> u64 {
self.capacity_msat
- .checked_sub(self.decayed_offset_msat(*self.max_liquidity_offset_msat))
- .unwrap_or(0)
+ .saturating_sub(self.decayed_offset_msat(*self.max_liquidity_offset_msat))
}
fn decayed_offset_msat(&self, offset_msat: u64) -> u64 {
- self.now.duration_since(*self.last_updated).as_secs()
- .checked_div(self.params.liquidity_offset_half_life.as_secs())
- .and_then(|decays| offset_msat.checked_shr(decays as u32))
- .unwrap_or(0)
+ let half_life = self.decay_params.liquidity_offset_half_life.as_secs();
+ if half_life != 0 {
+ // Decay the offset by the appropriate number of half lives. If half of the next half
+ // life has passed, approximate an additional three-quarter life to help smooth out the
+ // decay.
+ let elapsed_time = self.now.duration_since(*self.last_updated).as_secs();
+ let half_decays = elapsed_time / (half_life / 2);
+ let decays = half_decays / 2;
+ let decayed_offset_msat = offset_msat.checked_shr(decays as u32).unwrap_or(0);
+ if half_decays % 2 == 0 {
+ decayed_offset_msat
+ } else {
+ // 11_585 / 16_384 ~= core::f64::consts::FRAC_1_SQRT_2
+ // 16_384 == 2^14
+ (decayed_offset_msat as u128 * 11_585 / 16_384) as u64
+ }
+ } else {
+ 0
+ }
}
}
-impl<L: DerefMut<Target = u64>, BRT: DerefMut<Target = HistoricalBucketRangeTracker>, T: Time, U: DerefMut<Target = T>> DirectedChannelLiquidity<'_, L, BRT, T, U> {
+impl<L: DerefMut<Target = u64>, BRT: DerefMut<Target = HistoricalBucketRangeTracker>, T: Time, U: DerefMut<Target = T>> DirectedChannelLiquidity<L, BRT, T, U> {
/// Adjusts the channel liquidity balance bounds when failing to route `amount_msat`.
fn failed_at_channel<Log: Deref>(&mut self, amount_msat: u64, chan_descr: fmt::Arguments, logger: &Log) where Log::Target: Logger {
let existing_max_msat = self.max_liquidity_msat();
log_trace!(logger, "Max liquidity of {} is {} (already less than or equal to {})",
chan_descr, existing_max_msat, amount_msat);
}
+ self.update_history_buckets(0);
}
/// Adjusts the channel liquidity balance bounds when failing to route `amount_msat` downstream.
log_trace!(logger, "Min liquidity of {} is {} (already greater than or equal to {})",
chan_descr, existing_min_msat, amount_msat);
}
+ self.update_history_buckets(0);
}
/// Adjusts the channel liquidity balance bounds when successfully routing `amount_msat`.
let max_liquidity_msat = self.max_liquidity_msat().checked_sub(amount_msat).unwrap_or(0);
log_debug!(logger, "Subtracting {} from max liquidity of {} (setting it to {})", amount_msat, chan_descr, max_liquidity_msat);
self.set_max_liquidity_msat(max_liquidity_msat);
+ self.update_history_buckets(amount_msat);
}
- fn update_history_buckets(&mut self) {
+ /// Updates the history buckets for this channel. Because the history buckets track what we now
+ /// know about the channel's state *prior to our payment* (i.e. what we assume is "steady
+ /// state"), we allow the caller to set an offset applied to our liquidity bounds which
+ /// represents the amount of the successful payment we just made.
+ fn update_history_buckets(&mut self, bucket_offset_msat: u64) {
let half_lives = self.now.duration_since(*self.last_updated).as_secs()
- .checked_div(self.params.historical_no_updates_half_life.as_secs())
+ .checked_div(self.decay_params.historical_no_updates_half_life.as_secs())
.map(|v| v.try_into().unwrap_or(u32::max_value())).unwrap_or(u32::max_value());
- self.min_liquidity_offset_history.time_decay_data(half_lives);
- self.max_liquidity_offset_history.time_decay_data(half_lives);
-
- debug_assert!(*self.min_liquidity_offset_msat <= self.capacity_msat);
- self.min_liquidity_offset_history.track_datapoint(
- // Ensure the bucket index we pass is in the range [0, 7], even if the liquidity offset
- // is zero or the channel's capacity, though the second should generally never happen.
- (self.min_liquidity_offset_msat.saturating_sub(1) * 8 / self.capacity_msat)
- .try_into().unwrap_or(32)); // 32 is bogus for 8 buckets, and will be ignored
- debug_assert!(*self.max_liquidity_offset_msat <= self.capacity_msat);
- self.max_liquidity_offset_history.track_datapoint(
- // Ensure the bucket index we pass is in the range [0, 7], even if the liquidity offset
- // is zero or the channel's capacity, though the second should generally never happen.
- (self.max_liquidity_offset_msat.saturating_sub(1) * 8 / self.capacity_msat)
- .try_into().unwrap_or(32)); // 32 is bogus for 8 buckets, and will be ignored
+ self.liquidity_history.min_liquidity_offset_history.time_decay_data(half_lives);
+ self.liquidity_history.max_liquidity_offset_history.time_decay_data(half_lives);
+
+ let min_liquidity_offset_msat = self.decayed_offset_msat(*self.min_liquidity_offset_msat);
+ self.liquidity_history.min_liquidity_offset_history.track_datapoint(
+ min_liquidity_offset_msat + bucket_offset_msat, self.capacity_msat
+ );
+ let max_liquidity_offset_msat = self.decayed_offset_msat(*self.max_liquidity_offset_msat);
+ self.liquidity_history.max_liquidity_offset_history.track_datapoint(
+ max_liquidity_offset_msat.saturating_sub(bucket_offset_msat), self.capacity_msat
+ );
}
/// Adjusts the lower bound of the channel liquidity balance in this direction.
} else {
self.decayed_offset_msat(*self.max_liquidity_offset_msat)
};
- self.update_history_buckets();
*self.last_updated = self.now;
}
} else {
self.decayed_offset_msat(*self.min_liquidity_offset_msat)
};
- self.update_history_buckets();
*self.last_updated = self.now;
}
}
-impl<G: Deref<Target = NetworkGraph<L>>, L: Deref, T: Time> Score for ProbabilisticScorerUsingTime<G, L, T> where L::Target: Logger {
+impl<G: Deref<Target = NetworkGraph<L>>, L: Deref, T: Time> ScoreLookUp for ProbabilisticScorerUsingTime<G, L, T> where L::Target: Logger {
+ type ScoreParams = ProbabilisticScoringFeeParameters;
fn channel_penalty_msat(
- &self, short_channel_id: u64, source: &NodeId, target: &NodeId, usage: ChannelUsage
+ &self, short_channel_id: u64, source: &NodeId, target: &NodeId, usage: ChannelUsage, score_params: &ProbabilisticScoringFeeParameters
) -> u64 {
- if let Some(penalty) = self.params.manual_node_penalties.get(target) {
+ if let Some(penalty) = score_params.manual_node_penalties.get(target) {
return *penalty;
}
- let base_penalty_msat = self.params.base_penalty_msat.saturating_add(
- self.params.base_penalty_amount_multiplier_msat
+ let base_penalty_msat = score_params.base_penalty_msat.saturating_add(
+ score_params.base_penalty_amount_multiplier_msat
.saturating_mul(usage.amount_msat) / BASE_AMOUNT_PENALTY_DIVISOR);
let mut anti_probing_penalty_msat = 0;
match usage.effective_capacity {
- EffectiveCapacity::ExactLiquidity { liquidity_msat } => {
- if usage.amount_msat > liquidity_msat {
+ EffectiveCapacity::ExactLiquidity { liquidity_msat: amount_msat } |
+ EffectiveCapacity::HintMaxHTLC { amount_msat } =>
+ {
+ if usage.amount_msat > amount_msat {
return u64::max_value();
} else {
return base_penalty_msat;
},
EffectiveCapacity::Total { capacity_msat, htlc_maximum_msat } => {
if htlc_maximum_msat >= capacity_msat/2 {
- anti_probing_penalty_msat = self.params.anti_probing_penalty_msat;
+ anti_probing_penalty_msat = score_params.anti_probing_penalty_msat;
}
},
_ => {},
}
- let amount_msat = usage.amount_msat;
- let capacity_msat = usage.effective_capacity.as_msat()
- .saturating_sub(usage.inflight_htlc_msat);
+ let amount_msat = usage.amount_msat.saturating_add(usage.inflight_htlc_msat);
+ let capacity_msat = usage.effective_capacity.as_msat();
self.channel_liquidities
.get(&short_channel_id)
.unwrap_or(&ChannelLiquidity::new())
- .as_directed(source, target, capacity_msat, &self.params)
- .penalty_msat(amount_msat, &self.params)
+ .as_directed(source, target, capacity_msat, self.decay_params)
+ .penalty_msat(amount_msat, score_params)
.saturating_add(anti_probing_penalty_msat)
.saturating_add(base_penalty_msat)
}
+}
- fn payment_path_failed(&mut self, path: &[&RouteHop], short_channel_id: u64) {
- let amount_msat = path.split_last().map(|(hop, _)| hop.fee_msat).unwrap_or(0);
+impl<G: Deref<Target = NetworkGraph<L>>, L: Deref, T: Time> ScoreUpdate for ProbabilisticScorerUsingTime<G, L, T> where L::Target: Logger {
+ fn payment_path_failed(&mut self, path: &Path, short_channel_id: u64) {
+ let amount_msat = path.final_value_msat();
log_trace!(self.logger, "Scoring path through to SCID {} as having failed at {} msat", short_channel_id, amount_msat);
let network_graph = self.network_graph.read_only();
- for (hop_idx, hop) in path.iter().enumerate() {
+ for (hop_idx, hop) in path.hops.iter().enumerate() {
let target = NodeId::from_pubkey(&hop.pubkey);
let channel_directed_from_source = network_graph.channels()
.get(&hop.short_channel_id)
self.channel_liquidities
.entry(hop.short_channel_id)
.or_insert_with(ChannelLiquidity::new)
- .as_directed_mut(source, &target, capacity_msat, &self.params)
+ .as_directed_mut(source, &target, capacity_msat, self.decay_params)
.failed_at_channel(amount_msat, format_args!("SCID {}, towards {:?}", hop.short_channel_id, target), &self.logger);
} else {
self.channel_liquidities
.entry(hop.short_channel_id)
.or_insert_with(ChannelLiquidity::new)
- .as_directed_mut(source, &target, capacity_msat, &self.params)
+ .as_directed_mut(source, &target, capacity_msat, self.decay_params)
.failed_downstream(amount_msat, format_args!("SCID {}, towards {:?}", hop.short_channel_id, target), &self.logger);
}
} else {
}
}
- fn payment_path_successful(&mut self, path: &[&RouteHop]) {
- let amount_msat = path.split_last().map(|(hop, _)| hop.fee_msat).unwrap_or(0);
+ fn payment_path_successful(&mut self, path: &Path) {
+ let amount_msat = path.final_value_msat();
log_trace!(self.logger, "Scoring path through SCID {} as having succeeded at {} msat.",
- path.split_last().map(|(hop, _)| hop.short_channel_id).unwrap_or(0), amount_msat);
+ path.hops.split_last().map(|(hop, _)| hop.short_channel_id).unwrap_or(0), amount_msat);
let network_graph = self.network_graph.read_only();
- for hop in path {
+ for hop in &path.hops {
let target = NodeId::from_pubkey(&hop.pubkey);
let channel_directed_from_source = network_graph.channels()
.get(&hop.short_channel_id)
self.channel_liquidities
.entry(hop.short_channel_id)
.or_insert_with(ChannelLiquidity::new)
- .as_directed_mut(source, &target, capacity_msat, &self.params)
+ .as_directed_mut(source, &target, capacity_msat, self.decay_params)
.successful(amount_msat, format_args!("SCID {}, towards {:?}", hop.short_channel_id, target), &self.logger);
} else {
log_debug!(self.logger, "Not able to learn for channel with SCID {} as we do not have graph info for it (likely a route-hint last-hop).",
}
}
- fn probe_failed(&mut self, path: &[&RouteHop], short_channel_id: u64) {
+ fn probe_failed(&mut self, path: &Path, short_channel_id: u64) {
self.payment_path_failed(path, short_channel_id)
}
- fn probe_successful(&mut self, path: &[&RouteHop]) {
+ fn probe_successful(&mut self, path: &Path) {
self.payment_path_failed(path, u64::max_value())
}
}
+#[cfg(c_bindings)]
+impl<G: Deref<Target = NetworkGraph<L>>, L: Deref, T: Time> Score for ProbabilisticScorerUsingTime<G, L, T>
+where L::Target: Logger {}
+
mod approx {
const BITS: u32 = 64;
const HIGHEST_BIT: u32 = BITS - 1;
}
}
+mod bucketed_history {
+ use super::*;
+
+ // Because liquidity is often skewed heavily in one direction, we store historical state
+ // distribution in buckets of different size. For backwards compatibility, buckets of size 1/8th
+ // must fit evenly into the buckets here.
+ //
+ // The smallest bucket is 2^-14th of the channel, for each of our 32 buckets here we define the
+ // width of the bucket in 2^14'ths of the channel. This increases exponentially until we reach
+ // a full 16th of the channel's capacity, which is reapeated a few times for backwards
+ // compatibility. The four middle buckets represent full octiles of the channel's capacity.
+ //
+ // For a 1 BTC channel, this let's us differentiate between failures in the bottom 6k sats, or
+ // between the 12,000th sat and 24,000th sat, while only needing to store and operate on 32
+ // buckets in total.
+
+ const BUCKET_START_POS: [u16; 33] = [
+ 0, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 3072, 4096, 6144, 8192, 10240, 12288,
+ 13312, 14336, 15360, 15872, 16128, 16256, 16320, 16352, 16368, 16376, 16380, 16382, 16383, 16384,
+ ];
+
+ const LEGACY_TO_BUCKET_RANGE: [(u8, u8); 8] = [
+ (0, 12), (12, 14), (14, 15), (15, 16), (16, 17), (17, 18), (18, 20), (20, 32)
+ ];
+
+ const POSITION_TICKS: u16 = 1 << 14;
+
+ fn pos_to_bucket(pos: u16) -> usize {
+ for bucket in 0..32 {
+ if pos < BUCKET_START_POS[bucket + 1] {
+ return bucket;
+ }
+ }
+ debug_assert!(false);
+ return 32;
+ }
+
+ #[cfg(test)]
+ #[test]
+ fn check_bucket_maps() {
+ const BUCKET_WIDTH_IN_16384S: [u16; 32] = [
+ 1, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 1024, 1024, 2048, 2048,
+ 2048, 2048, 1024, 1024, 1024, 512, 256, 128, 64, 32, 16, 8, 4, 2, 1, 1];
+
+ let mut min_size_iter = 0;
+ let mut legacy_bucket_iter = 0;
+ for (bucket, width) in BUCKET_WIDTH_IN_16384S.iter().enumerate() {
+ assert_eq!(BUCKET_START_POS[bucket], min_size_iter);
+ for i in 0..*width {
+ assert_eq!(pos_to_bucket(min_size_iter + i) as usize, bucket);
+ }
+ min_size_iter += *width;
+ if min_size_iter % (POSITION_TICKS / 8) == 0 {
+ assert_eq!(LEGACY_TO_BUCKET_RANGE[legacy_bucket_iter].1 as usize, bucket + 1);
+ if legacy_bucket_iter + 1 < 8 {
+ assert_eq!(LEGACY_TO_BUCKET_RANGE[legacy_bucket_iter + 1].0 as usize, bucket + 1);
+ }
+ legacy_bucket_iter += 1;
+ }
+ }
+ assert_eq!(BUCKET_START_POS[32], POSITION_TICKS);
+ assert_eq!(min_size_iter, POSITION_TICKS);
+ }
+
+ #[inline]
+ fn amount_to_pos(amount_msat: u64, capacity_msat: u64) -> u16 {
+ let pos = if amount_msat < u64::max_value() / (POSITION_TICKS as u64) {
+ (amount_msat * (POSITION_TICKS as u64) / capacity_msat.saturating_add(1))
+ .try_into().unwrap_or(POSITION_TICKS)
+ } else {
+ // Only use 128-bit arithmetic when multiplication will overflow to avoid 128-bit
+ // division. This branch should only be hit in fuzz testing since the amount would
+ // need to be over 2.88 million BTC in practice.
+ ((amount_msat as u128) * (POSITION_TICKS as u128)
+ / (capacity_msat as u128).saturating_add(1))
+ .try_into().unwrap_or(POSITION_TICKS)
+ };
+ // If we are running in a client that doesn't validate gossip, its possible for a channel's
+ // capacity to change due to a `channel_update` message which, if received while a payment
+ // is in-flight, could cause this to fail. Thus, we only assert in test.
+ #[cfg(test)]
+ debug_assert!(pos < POSITION_TICKS);
+ pos
+ }
+
+ /// Prior to LDK 0.0.117 we used eight buckets which were split evenly across the either
+ /// octiles. This was changed to use 32 buckets for accuracy reasons in 0.0.117, however we
+ /// support reading the legacy values here for backwards compatibility.
+ pub(super) struct LegacyHistoricalBucketRangeTracker {
+ buckets: [u16; 8],
+ }
+
+ impl LegacyHistoricalBucketRangeTracker {
+ pub(crate) fn into_current(&self) -> HistoricalBucketRangeTracker {
+ let mut buckets = [0; 32];
+ for (idx, legacy_bucket) in self.buckets.iter().enumerate() {
+ let mut new_val = *legacy_bucket;
+ let (start, end) = LEGACY_TO_BUCKET_RANGE[idx];
+ new_val /= (end - start) as u16;
+ for i in start..end {
+ buckets[i as usize] = new_val;
+ }
+ }
+ HistoricalBucketRangeTracker { buckets }
+ }
+ }
+
+ /// Tracks the historical state of a distribution as a weighted average of how much time was spent
+ /// in each of 32 buckets.
+ #[derive(Clone, Copy)]
+ pub(super) struct HistoricalBucketRangeTracker {
+ buckets: [u16; 32],
+ }
+
+ /// Buckets are stored in fixed point numbers with a 5 bit fractional part. Thus, the value
+ /// "one" is 32, or this constant.
+ pub const BUCKET_FIXED_POINT_ONE: u16 = 32;
+
+ impl HistoricalBucketRangeTracker {
+ pub(super) fn new() -> Self { Self { buckets: [0; 32] } }
+ pub(super) fn track_datapoint(&mut self, liquidity_offset_msat: u64, capacity_msat: u64) {
+ // We have 32 leaky buckets for min and max liquidity. Each bucket tracks the amount of time
+ // we spend in each bucket as a 16-bit fixed-point number with a 5 bit fractional part.
+ //
+ // Each time we update our liquidity estimate, we add 32 (1.0 in our fixed-point system) to
+ // the buckets for the current min and max liquidity offset positions.
+ //
+ // We then decay each bucket by multiplying by 2047/2048 (avoiding dividing by a
+ // non-power-of-two). This ensures we can't actually overflow the u16 - when we get to
+ // 63,457 adding 32 and decaying by 2047/2048 leaves us back at 63,457.
+ //
+ // In total, this allows us to track data for the last 8,000 or so payments across a given
+ // channel.
+ //
+ // These constants are a balance - we try to fit in 2 bytes per bucket to reduce overhead,
+ // and need to balance having more bits in the decimal part (to ensure decay isn't too
+ // non-linear) with having too few bits in the mantissa, causing us to not store very many
+ // datapoints.
+ //
+ // The constants were picked experimentally, selecting a decay amount that restricts us
+ // from overflowing buckets without having to cap them manually.
+
+ let pos: u16 = amount_to_pos(liquidity_offset_msat, capacity_msat);
+ if pos < POSITION_TICKS {
+ for e in self.buckets.iter_mut() {
+ *e = ((*e as u32) * 2047 / 2048) as u16;
+ }
+ let bucket = pos_to_bucket(pos);
+ self.buckets[bucket] = self.buckets[bucket].saturating_add(BUCKET_FIXED_POINT_ONE);
+ }
+ }
+ /// Decay all buckets by the given number of half-lives. Used to more aggressively remove old
+ /// datapoints as we receive newer information.
+ #[inline]
+ pub(super) fn time_decay_data(&mut self, half_lives: u32) {
+ for e in self.buckets.iter_mut() {
+ *e = e.checked_shr(half_lives).unwrap_or(0);
+ }
+ }
+ }
+
+ impl_writeable_tlv_based!(HistoricalBucketRangeTracker, { (0, buckets, required) });
+ impl_writeable_tlv_based!(LegacyHistoricalBucketRangeTracker, { (0, buckets, required) });
+
+ /// A set of buckets representing the history of where we've seen the minimum- and maximum-
+ /// liquidity bounds for a given channel.
+ pub(super) struct HistoricalMinMaxBuckets<D: Deref<Target = HistoricalBucketRangeTracker>> {
+ /// Buckets tracking where and how often we've seen the minimum liquidity bound for a
+ /// channel.
+ pub(super) min_liquidity_offset_history: D,
+ /// Buckets tracking where and how often we've seen the maximum liquidity bound for a
+ /// channel.
+ pub(super) max_liquidity_offset_history: D,
+ }
+
+ impl<D: Deref<Target = HistoricalBucketRangeTracker>> HistoricalMinMaxBuckets<D> {
+ pub(super) fn get_decayed_buckets<T: Time>(&self, now: T, last_updated: T, half_life: Duration)
+ -> Option<([u16; 32], [u16; 32])> {
+ let (_, required_decays) = self.get_total_valid_points(now, last_updated, half_life)?;
+
+ let mut min_buckets = *self.min_liquidity_offset_history;
+ min_buckets.time_decay_data(required_decays);
+ let mut max_buckets = *self.max_liquidity_offset_history;
+ max_buckets.time_decay_data(required_decays);
+ Some((min_buckets.buckets, max_buckets.buckets))
+ }
+ #[inline]
+ pub(super) fn get_total_valid_points<T: Time>(&self, now: T, last_updated: T, half_life: Duration)
+ -> Option<(u64, u32)> {
+ let required_decays = now.duration_since(last_updated).as_secs()
+ .checked_div(half_life.as_secs())
+ .map_or(u32::max_value(), |decays| cmp::min(decays, u32::max_value() as u64) as u32);
+
+ let mut total_valid_points_tracked = 0;
+ for (min_idx, min_bucket) in self.min_liquidity_offset_history.buckets.iter().enumerate() {
+ for max_bucket in self.max_liquidity_offset_history.buckets.iter().take(32 - min_idx) {
+ total_valid_points_tracked += (*min_bucket as u64) * (*max_bucket as u64);
+ }
+ }
+
+ // If the total valid points is smaller than 1.0 (i.e. 32 in our fixed-point scheme),
+ // treat it as if we were fully decayed.
+ const FULLY_DECAYED: u16 = BUCKET_FIXED_POINT_ONE * BUCKET_FIXED_POINT_ONE;
+ if total_valid_points_tracked.checked_shr(required_decays).unwrap_or(0) < FULLY_DECAYED.into() {
+ return None;
+ }
+
+ Some((total_valid_points_tracked, required_decays))
+ }
+
+ #[inline]
+ pub(super) fn calculate_success_probability_times_billion<T: Time>(
+ &self, now: T, last_updated: T, half_life: Duration,
+ params: &ProbabilisticScoringFeeParameters, amount_msat: u64, capacity_msat: u64
+ ) -> Option<u64> {
+ // If historical penalties are enabled, we try to calculate a probability of success
+ // given our historical distribution of min- and max-liquidity bounds in a channel.
+ // To do so, we walk the set of historical liquidity bucket (min, max) combinations
+ // (where min_idx < max_idx, as having a minimum above our maximum is an invalid
+ // state). For each pair, we calculate the probability as if the bucket's corresponding
+ // min- and max- liquidity bounds were our current liquidity bounds and then multiply
+ // that probability by the weight of the selected buckets.
+ let payment_pos = amount_to_pos(amount_msat, capacity_msat);
+ if payment_pos >= POSITION_TICKS { return None; }
+
+ // Check if all our buckets are zero, once decayed and treat it as if we had no data. We
+ // don't actually use the decayed buckets, though, as that would lose precision.
+ let (total_valid_points_tracked, _)
+ = self.get_total_valid_points(now, last_updated, half_life)?;
+
+ let mut cumulative_success_prob_times_billion = 0;
+ // Special-case the 0th min bucket - it generally means we failed a payment, so only
+ // consider the highest (i.e. largest-offset-from-max-capacity) max bucket for all
+ // points against the 0th min bucket. This avoids the case where we fail to route
+ // increasingly lower values over a channel, but treat each failure as a separate
+ // datapoint, many of which may have relatively high maximum-available-liquidity
+ // values, which will result in us thinking we have some nontrivial probability of
+ // routing up to that amount.
+ if self.min_liquidity_offset_history.buckets[0] != 0 {
+ let mut highest_max_bucket_with_points = 0; // The highest max-bucket with any data
+ let mut total_max_points = 0; // Total points in max-buckets to consider
+ for (max_idx, max_bucket) in self.max_liquidity_offset_history.buckets.iter().enumerate() {
+ if *max_bucket >= BUCKET_FIXED_POINT_ONE {
+ highest_max_bucket_with_points = cmp::max(highest_max_bucket_with_points, max_idx);
+ }
+ total_max_points += *max_bucket as u64;
+ }
+ let max_bucket_end_pos = BUCKET_START_POS[32 - highest_max_bucket_with_points] - 1;
+ if payment_pos < max_bucket_end_pos {
+ let (numerator, denominator) = success_probability(payment_pos as u64, 0,
+ max_bucket_end_pos as u64, POSITION_TICKS as u64 - 1, params, true);
+ let bucket_prob_times_billion =
+ (self.min_liquidity_offset_history.buckets[0] as u64) * total_max_points
+ * 1024 * 1024 * 1024 / total_valid_points_tracked;
+ cumulative_success_prob_times_billion += bucket_prob_times_billion *
+ numerator / denominator;
+ }
+ }
+
+ for (min_idx, min_bucket) in self.min_liquidity_offset_history.buckets.iter().enumerate().skip(1) {
+ let min_bucket_start_pos = BUCKET_START_POS[min_idx];
+ for (max_idx, max_bucket) in self.max_liquidity_offset_history.buckets.iter().enumerate().take(32 - min_idx) {
+ let max_bucket_end_pos = BUCKET_START_POS[32 - max_idx] - 1;
+ // Note that this multiply can only barely not overflow - two 16 bit ints plus
+ // 30 bits is 62 bits.
+ let bucket_prob_times_billion = (*min_bucket as u64) * (*max_bucket as u64)
+ * 1024 * 1024 * 1024 / total_valid_points_tracked;
+ if payment_pos >= max_bucket_end_pos {
+ // Success probability 0, the payment amount may be above the max liquidity
+ break;
+ } else if payment_pos < min_bucket_start_pos {
+ cumulative_success_prob_times_billion += bucket_prob_times_billion;
+ } else {
+ let (numerator, denominator) = success_probability(payment_pos as u64,
+ min_bucket_start_pos as u64, max_bucket_end_pos as u64,
+ POSITION_TICKS as u64 - 1, params, true);
+ cumulative_success_prob_times_billion += bucket_prob_times_billion *
+ numerator / denominator;
+ }
+ }
+ }
+
+ Some(cumulative_success_prob_times_billion)
+ }
+ }
+}
+use bucketed_history::{LegacyHistoricalBucketRangeTracker, HistoricalBucketRangeTracker, HistoricalMinMaxBuckets};
+
impl<G: Deref<Target = NetworkGraph<L>>, L: Deref, T: Time> Writeable for ProbabilisticScorerUsingTime<G, L, T> where L::Target: Logger {
#[inline]
fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
}
impl<G: Deref<Target = NetworkGraph<L>>, L: Deref, T: Time>
-ReadableArgs<(ProbabilisticScoringParameters, G, L)> for ProbabilisticScorerUsingTime<G, L, T> where L::Target: Logger {
+ReadableArgs<(ProbabilisticScoringDecayParameters, G, L)> for ProbabilisticScorerUsingTime<G, L, T> where L::Target: Logger {
#[inline]
fn read<R: Read>(
- r: &mut R, args: (ProbabilisticScoringParameters, G, L)
+ r: &mut R, args: (ProbabilisticScoringDecayParameters, G, L)
) -> Result<Self, DecodeError> {
- let (params, network_graph, logger) = args;
+ let (decay_params, network_graph, logger) = args;
let mut channel_liquidities = HashMap::new();
read_tlv_fields!(r, {
(0, channel_liquidities, required),
});
Ok(Self {
- params,
+ decay_params,
network_graph,
logger,
channel_liquidities,
let duration_since_epoch = T::duration_since_epoch() - self.last_updated.elapsed();
write_tlv_fields!(w, {
(0, self.min_liquidity_offset_msat, required),
- (1, Some(self.min_liquidity_offset_history), option),
+ // 1 was the min_liquidity_offset_history in octile form
(2, self.max_liquidity_offset_msat, required),
- (3, Some(self.max_liquidity_offset_history), option),
+ // 3 was the max_liquidity_offset_history in octile form
(4, duration_since_epoch, required),
+ (5, Some(self.min_liquidity_offset_history), option),
+ (7, Some(self.max_liquidity_offset_history), option),
});
Ok(())
}
fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
let mut min_liquidity_offset_msat = 0;
let mut max_liquidity_offset_msat = 0;
- let mut min_liquidity_offset_history = Some(HistoricalBucketRangeTracker::new());
- let mut max_liquidity_offset_history = Some(HistoricalBucketRangeTracker::new());
+ let mut legacy_min_liq_offset_history: Option<LegacyHistoricalBucketRangeTracker> = None;
+ let mut legacy_max_liq_offset_history: Option<LegacyHistoricalBucketRangeTracker> = None;
+ let mut min_liquidity_offset_history: Option<HistoricalBucketRangeTracker> = None;
+ let mut max_liquidity_offset_history: Option<HistoricalBucketRangeTracker> = None;
let mut duration_since_epoch = Duration::from_secs(0);
read_tlv_fields!(r, {
(0, min_liquidity_offset_msat, required),
- (1, min_liquidity_offset_history, option),
+ (1, legacy_min_liq_offset_history, option),
(2, max_liquidity_offset_msat, required),
- (3, max_liquidity_offset_history, option),
+ (3, legacy_max_liq_offset_history, option),
(4, duration_since_epoch, required),
+ (5, min_liquidity_offset_history, option),
+ (7, max_liquidity_offset_history, option),
});
// On rust prior to 1.60 `Instant::duration_since` will panic if time goes backwards.
// We write `last_updated` as wallclock time even though its ultimately an `Instant` (which
let last_updated = if wall_clock_now > duration_since_epoch {
now - (wall_clock_now - duration_since_epoch)
} else { now };
+ if min_liquidity_offset_history.is_none() {
+ if let Some(legacy_buckets) = legacy_min_liq_offset_history {
+ min_liquidity_offset_history = Some(legacy_buckets.into_current());
+ } else {
+ min_liquidity_offset_history = Some(HistoricalBucketRangeTracker::new());
+ }
+ }
+ if max_liquidity_offset_history.is_none() {
+ if let Some(legacy_buckets) = legacy_max_liq_offset_history {
+ max_liquidity_offset_history = Some(legacy_buckets.into_current());
+ } else {
+ max_liquidity_offset_history = Some(HistoricalBucketRangeTracker::new());
+ }
+ }
Ok(Self {
min_liquidity_offset_msat,
max_liquidity_offset_msat,
#[cfg(test)]
mod tests {
- use super::{ChannelLiquidity, HistoricalBucketRangeTracker, ProbabilisticScoringParameters, ProbabilisticScorerUsingTime};
+ use super::{ChannelLiquidity, HistoricalBucketRangeTracker, ProbabilisticScoringFeeParameters, ProbabilisticScoringDecayParameters, ProbabilisticScorerUsingTime};
+ use crate::blinded_path::{BlindedHop, BlindedPath};
+ use crate::util::config::UserConfig;
use crate::util::time::Time;
use crate::util::time::tests::SinceEpoch;
use crate::ln::channelmanager;
use crate::ln::msgs::{ChannelAnnouncement, ChannelUpdate, UnsignedChannelAnnouncement, UnsignedChannelUpdate};
use crate::routing::gossip::{EffectiveCapacity, NetworkGraph, NodeId};
- use crate::routing::router::RouteHop;
- use crate::routing::scoring::{ChannelUsage, Score};
+ use crate::routing::router::{BlindedTail, Path, RouteHop};
+ use crate::routing::scoring::{ChannelUsage, ScoreLookUp, ScoreUpdate};
use crate::util::ser::{ReadableArgs, Writeable};
- use crate::util::test_utils::TestLogger;
+ use crate::util::test_utils::{self, TestLogger};
- use bitcoin::blockdata::constants::genesis_block;
+ use bitcoin::blockdata::constants::ChainHash;
use bitcoin::hashes::Hash;
use bitcoin::hashes::sha256d::Hash as Sha256dHash;
use bitcoin::network::constants::Network;
}
fn network_graph(logger: &TestLogger) -> NetworkGraph<&TestLogger> {
- let genesis_hash = genesis_block(Network::Testnet).header.block_hash();
- let mut network_graph = NetworkGraph::new(genesis_hash, logger);
+ let mut network_graph = NetworkGraph::new(Network::Testnet, logger);
add_channel(&mut network_graph, 42, source_privkey(), target_privkey());
add_channel(&mut network_graph, 43, target_privkey(), recipient_privkey());
network_graph: &mut NetworkGraph<&TestLogger>, short_channel_id: u64, node_1_key: SecretKey,
node_2_key: SecretKey
) {
- let genesis_hash = genesis_block(Network::Testnet).header.block_hash();
+ let genesis_hash = ChainHash::using_genesis_block(Network::Testnet);
let node_1_secret = &SecretKey::from_slice(&[39; 32]).unwrap();
let node_2_secret = &SecretKey::from_slice(&[40; 32]).unwrap();
let secp_ctx = Secp256k1::new();
let unsigned_announcement = UnsignedChannelAnnouncement {
- features: channelmanager::provided_channel_features(),
+ features: channelmanager::provided_channel_features(&UserConfig::default()),
chain_hash: genesis_hash,
short_channel_id,
- node_id_1: PublicKey::from_secret_key(&secp_ctx, &node_1_key),
- node_id_2: PublicKey::from_secret_key(&secp_ctx, &node_2_key),
- bitcoin_key_1: PublicKey::from_secret_key(&secp_ctx, &node_1_secret),
- bitcoin_key_2: PublicKey::from_secret_key(&secp_ctx, &node_2_secret),
+ node_id_1: NodeId::from_pubkey(&PublicKey::from_secret_key(&secp_ctx, &node_1_key)),
+ node_id_2: NodeId::from_pubkey(&PublicKey::from_secret_key(&secp_ctx, &node_2_key)),
+ bitcoin_key_1: NodeId::from_pubkey(&PublicKey::from_secret_key(&secp_ctx, &node_1_secret)),
+ bitcoin_key_2: NodeId::from_pubkey(&PublicKey::from_secret_key(&secp_ctx, &node_2_secret)),
excess_data: Vec::new(),
};
let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
let chain_source: Option<&crate::util::test_utils::TestChainSource> = None;
network_graph.update_channel_from_announcement(
&signed_announcement, &chain_source).unwrap();
- update_channel(network_graph, short_channel_id, node_1_key, 0);
- update_channel(network_graph, short_channel_id, node_2_key, 1);
+ update_channel(network_graph, short_channel_id, node_1_key, 0, 1_000, 100);
+ update_channel(network_graph, short_channel_id, node_2_key, 1, 0, 100);
}
fn update_channel(
network_graph: &mut NetworkGraph<&TestLogger>, short_channel_id: u64, node_key: SecretKey,
- flags: u8
+ flags: u8, htlc_maximum_msat: u64, timestamp: u32,
) {
- let genesis_hash = genesis_block(Network::Testnet).header.block_hash();
+ let genesis_hash = ChainHash::using_genesis_block(Network::Testnet);
let secp_ctx = Secp256k1::new();
let unsigned_update = UnsignedChannelUpdate {
chain_hash: genesis_hash,
short_channel_id,
- timestamp: 100,
+ timestamp,
flags,
cltv_expiry_delta: 18,
htlc_minimum_msat: 0,
- htlc_maximum_msat: 1_000,
+ htlc_maximum_msat,
fee_base_msat: 1,
fee_proportional_millionths: 0,
excess_data: Vec::new(),
}
fn path_hop(pubkey: PublicKey, short_channel_id: u64, fee_msat: u64) -> RouteHop {
+ let config = UserConfig::default();
RouteHop {
pubkey,
- node_features: channelmanager::provided_node_features(),
+ node_features: channelmanager::provided_node_features(&config),
short_channel_id,
- channel_features: channelmanager::provided_channel_features(),
+ channel_features: channelmanager::provided_channel_features(&config),
fee_msat,
cltv_expiry_delta: 18,
+ maybe_announced_channel: true,
}
}
- fn payment_path_for_amount(amount_msat: u64) -> Vec<RouteHop> {
- vec![
- path_hop(source_pubkey(), 41, 1),
- path_hop(target_pubkey(), 42, 2),
- path_hop(recipient_pubkey(), 43, amount_msat),
- ]
+ fn payment_path_for_amount(amount_msat: u64) -> Path {
+ Path {
+ hops: vec![
+ path_hop(source_pubkey(), 41, 1),
+ path_hop(target_pubkey(), 42, 2),
+ path_hop(recipient_pubkey(), 43, amount_msat),
+ ], blinded_tail: None,
+ }
}
#[test]
let logger = TestLogger::new();
let last_updated = SinceEpoch::now();
let network_graph = network_graph(&logger);
- let params = ProbabilisticScoringParameters::default();
- let mut scorer = ProbabilisticScorer::new(params, &network_graph, &logger)
+ let decay_params = ProbabilisticScoringDecayParameters::default();
+ let mut scorer = ProbabilisticScorer::new(decay_params, &network_graph, &logger)
.with_channel(42,
ChannelLiquidity {
min_liquidity_offset_msat: 700, max_liquidity_offset_msat: 100, last_updated,
// Update minimum liquidity.
let liquidity = scorer.channel_liquidities.get(&42).unwrap()
- .as_directed(&source, &target, 1_000, &scorer.params);
+ .as_directed(&source, &target, 1_000, decay_params);
assert_eq!(liquidity.min_liquidity_msat(), 100);
assert_eq!(liquidity.max_liquidity_msat(), 300);
let liquidity = scorer.channel_liquidities.get(&42).unwrap()
- .as_directed(&target, &source, 1_000, &scorer.params);
+ .as_directed(&target, &source, 1_000, decay_params);
assert_eq!(liquidity.min_liquidity_msat(), 700);
assert_eq!(liquidity.max_liquidity_msat(), 900);
scorer.channel_liquidities.get_mut(&42).unwrap()
- .as_directed_mut(&source, &target, 1_000, &scorer.params)
+ .as_directed_mut(&source, &target, 1_000, decay_params)
.set_min_liquidity_msat(200);
let liquidity = scorer.channel_liquidities.get(&42).unwrap()
- .as_directed(&source, &target, 1_000, &scorer.params);
+ .as_directed(&source, &target, 1_000, decay_params);
assert_eq!(liquidity.min_liquidity_msat(), 200);
assert_eq!(liquidity.max_liquidity_msat(), 300);
let liquidity = scorer.channel_liquidities.get(&42).unwrap()
- .as_directed(&target, &source, 1_000, &scorer.params);
+ .as_directed(&target, &source, 1_000, decay_params);
assert_eq!(liquidity.min_liquidity_msat(), 700);
assert_eq!(liquidity.max_liquidity_msat(), 800);
// Update maximum liquidity.
let liquidity = scorer.channel_liquidities.get(&43).unwrap()
- .as_directed(&target, &recipient, 1_000, &scorer.params);
+ .as_directed(&target, &recipient, 1_000, decay_params);
assert_eq!(liquidity.min_liquidity_msat(), 700);
assert_eq!(liquidity.max_liquidity_msat(), 900);
let liquidity = scorer.channel_liquidities.get(&43).unwrap()
- .as_directed(&recipient, &target, 1_000, &scorer.params);
+ .as_directed(&recipient, &target, 1_000, decay_params);
assert_eq!(liquidity.min_liquidity_msat(), 100);
assert_eq!(liquidity.max_liquidity_msat(), 300);
scorer.channel_liquidities.get_mut(&43).unwrap()
- .as_directed_mut(&target, &recipient, 1_000, &scorer.params)
+ .as_directed_mut(&target, &recipient, 1_000, decay_params)
.set_max_liquidity_msat(200);
let liquidity = scorer.channel_liquidities.get(&43).unwrap()
- .as_directed(&target, &recipient, 1_000, &scorer.params);
+ .as_directed(&target, &recipient, 1_000, decay_params);
assert_eq!(liquidity.min_liquidity_msat(), 0);
assert_eq!(liquidity.max_liquidity_msat(), 200);
let liquidity = scorer.channel_liquidities.get(&43).unwrap()
- .as_directed(&recipient, &target, 1_000, &scorer.params);
+ .as_directed(&recipient, &target, 1_000, decay_params);
assert_eq!(liquidity.min_liquidity_msat(), 800);
assert_eq!(liquidity.max_liquidity_msat(), 1000);
}
let logger = TestLogger::new();
let last_updated = SinceEpoch::now();
let network_graph = network_graph(&logger);
- let params = ProbabilisticScoringParameters::default();
- let mut scorer = ProbabilisticScorer::new(params, &network_graph, &logger)
+ let decay_params = ProbabilisticScoringDecayParameters::default();
+ let mut scorer = ProbabilisticScorer::new(decay_params, &network_graph, &logger)
.with_channel(42,
ChannelLiquidity {
min_liquidity_offset_msat: 200, max_liquidity_offset_msat: 400, last_updated,
// Check initial bounds.
let liquidity = scorer.channel_liquidities.get(&42).unwrap()
- .as_directed(&source, &target, 1_000, &scorer.params);
+ .as_directed(&source, &target, 1_000, decay_params);
assert_eq!(liquidity.min_liquidity_msat(), 400);
assert_eq!(liquidity.max_liquidity_msat(), 800);
let liquidity = scorer.channel_liquidities.get(&42).unwrap()
- .as_directed(&target, &source, 1_000, &scorer.params);
+ .as_directed(&target, &source, 1_000, decay_params);
assert_eq!(liquidity.min_liquidity_msat(), 200);
assert_eq!(liquidity.max_liquidity_msat(), 600);
// Reset from source to target.
scorer.channel_liquidities.get_mut(&42).unwrap()
- .as_directed_mut(&source, &target, 1_000, &scorer.params)
+ .as_directed_mut(&source, &target, 1_000, decay_params)
.set_min_liquidity_msat(900);
let liquidity = scorer.channel_liquidities.get(&42).unwrap()
- .as_directed(&source, &target, 1_000, &scorer.params);
+ .as_directed(&source, &target, 1_000, decay_params);
assert_eq!(liquidity.min_liquidity_msat(), 900);
assert_eq!(liquidity.max_liquidity_msat(), 1_000);
let liquidity = scorer.channel_liquidities.get(&42).unwrap()
- .as_directed(&target, &source, 1_000, &scorer.params);
+ .as_directed(&target, &source, 1_000, decay_params);
assert_eq!(liquidity.min_liquidity_msat(), 0);
assert_eq!(liquidity.max_liquidity_msat(), 100);
// Reset from target to source.
scorer.channel_liquidities.get_mut(&42).unwrap()
- .as_directed_mut(&target, &source, 1_000, &scorer.params)
+ .as_directed_mut(&target, &source, 1_000, decay_params)
.set_min_liquidity_msat(400);
let liquidity = scorer.channel_liquidities.get(&42).unwrap()
- .as_directed(&source, &target, 1_000, &scorer.params);
+ .as_directed(&source, &target, 1_000, decay_params);
assert_eq!(liquidity.min_liquidity_msat(), 0);
assert_eq!(liquidity.max_liquidity_msat(), 600);
let liquidity = scorer.channel_liquidities.get(&42).unwrap()
- .as_directed(&target, &source, 1_000, &scorer.params);
+ .as_directed(&target, &source, 1_000, decay_params);
assert_eq!(liquidity.min_liquidity_msat(), 400);
assert_eq!(liquidity.max_liquidity_msat(), 1_000);
}
let logger = TestLogger::new();
let last_updated = SinceEpoch::now();
let network_graph = network_graph(&logger);
- let params = ProbabilisticScoringParameters::default();
- let mut scorer = ProbabilisticScorer::new(params, &network_graph, &logger)
+ let decay_params = ProbabilisticScoringDecayParameters::default();
+ let mut scorer = ProbabilisticScorer::new(decay_params, &network_graph, &logger)
.with_channel(42,
ChannelLiquidity {
min_liquidity_offset_msat: 200, max_liquidity_offset_msat: 400, last_updated,
// Check initial bounds.
let liquidity = scorer.channel_liquidities.get(&42).unwrap()
- .as_directed(&source, &target, 1_000, &scorer.params);
+ .as_directed(&source, &target, 1_000, decay_params);
assert_eq!(liquidity.min_liquidity_msat(), 400);
assert_eq!(liquidity.max_liquidity_msat(), 800);
let liquidity = scorer.channel_liquidities.get(&42).unwrap()
- .as_directed(&target, &source, 1_000, &scorer.params);
+ .as_directed(&target, &source, 1_000, decay_params);
assert_eq!(liquidity.min_liquidity_msat(), 200);
assert_eq!(liquidity.max_liquidity_msat(), 600);
// Reset from source to target.
scorer.channel_liquidities.get_mut(&42).unwrap()
- .as_directed_mut(&source, &target, 1_000, &scorer.params)
+ .as_directed_mut(&source, &target, 1_000, decay_params)
.set_max_liquidity_msat(300);
let liquidity = scorer.channel_liquidities.get(&42).unwrap()
- .as_directed(&source, &target, 1_000, &scorer.params);
+ .as_directed(&source, &target, 1_000, decay_params);
assert_eq!(liquidity.min_liquidity_msat(), 0);
assert_eq!(liquidity.max_liquidity_msat(), 300);
let liquidity = scorer.channel_liquidities.get(&42).unwrap()
- .as_directed(&target, &source, 1_000, &scorer.params);
+ .as_directed(&target, &source, 1_000, decay_params);
assert_eq!(liquidity.min_liquidity_msat(), 700);
assert_eq!(liquidity.max_liquidity_msat(), 1_000);
// Reset from target to source.
scorer.channel_liquidities.get_mut(&42).unwrap()
- .as_directed_mut(&target, &source, 1_000, &scorer.params)
+ .as_directed_mut(&target, &source, 1_000, decay_params)
.set_max_liquidity_msat(600);
let liquidity = scorer.channel_liquidities.get(&42).unwrap()
- .as_directed(&source, &target, 1_000, &scorer.params);
+ .as_directed(&source, &target, 1_000, decay_params);
assert_eq!(liquidity.min_liquidity_msat(), 400);
assert_eq!(liquidity.max_liquidity_msat(), 1_000);
let liquidity = scorer.channel_liquidities.get(&42).unwrap()
- .as_directed(&target, &source, 1_000, &scorer.params);
+ .as_directed(&target, &source, 1_000, decay_params);
assert_eq!(liquidity.min_liquidity_msat(), 0);
assert_eq!(liquidity.max_liquidity_msat(), 600);
}
fn increased_penalty_nearing_liquidity_upper_bound() {
let logger = TestLogger::new();
let network_graph = network_graph(&logger);
- let params = ProbabilisticScoringParameters {
+ let params = ProbabilisticScoringFeeParameters {
liquidity_penalty_multiplier_msat: 1_000,
- ..ProbabilisticScoringParameters::zero_penalty()
+ ..ProbabilisticScoringFeeParameters::zero_penalty()
};
- let scorer = ProbabilisticScorer::new(params, &network_graph, &logger);
+ let decay_params = ProbabilisticScoringDecayParameters::default();
+ let scorer = ProbabilisticScorer::new(decay_params, &network_graph, &logger);
let source = source_node_id();
let target = target_node_id();
inflight_htlc_msat: 0,
effective_capacity: EffectiveCapacity::Total { capacity_msat: 1_024_000, htlc_maximum_msat: 1_000 },
};
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 0);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 0);
let usage = ChannelUsage { amount_msat: 10_240, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 0);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 0);
let usage = ChannelUsage { amount_msat: 102_400, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 47);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 47);
let usage = ChannelUsage { amount_msat: 1_023_999, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 2_000);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 2_000);
let usage = ChannelUsage {
amount_msat: 128,
inflight_htlc_msat: 0,
effective_capacity: EffectiveCapacity::Total { capacity_msat: 1_024, htlc_maximum_msat: 1_000 },
};
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 58);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 58);
let usage = ChannelUsage { amount_msat: 256, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 125);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 125);
let usage = ChannelUsage { amount_msat: 374, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 198);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 198);
let usage = ChannelUsage { amount_msat: 512, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 300);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 300);
let usage = ChannelUsage { amount_msat: 640, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 425);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 425);
let usage = ChannelUsage { amount_msat: 768, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 602);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 602);
let usage = ChannelUsage { amount_msat: 896, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 902);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 902);
}
#[test]
let logger = TestLogger::new();
let last_updated = SinceEpoch::now();
let network_graph = network_graph(&logger);
- let params = ProbabilisticScoringParameters {
+ let params = ProbabilisticScoringFeeParameters {
liquidity_penalty_multiplier_msat: 1_000,
considered_impossible_penalty_msat: u64::max_value(),
- ..ProbabilisticScoringParameters::zero_penalty()
+ ..ProbabilisticScoringFeeParameters::zero_penalty()
+ };
+ let decay_params = ProbabilisticScoringDecayParameters {
+ ..ProbabilisticScoringDecayParameters::zero_penalty()
};
- let scorer = ProbabilisticScorer::new(params, &network_graph, &logger)
+ let scorer = ProbabilisticScorer::new(decay_params, &network_graph, &logger)
.with_channel(42,
ChannelLiquidity {
min_liquidity_offset_msat: 40, max_liquidity_offset_msat: 40, last_updated,
inflight_htlc_msat: 0,
effective_capacity: EffectiveCapacity::Total { capacity_msat: 100, htlc_maximum_msat: 1_000 },
};
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 0);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 0);
let usage = ChannelUsage { amount_msat: 50, ..usage };
- assert_ne!(scorer.channel_penalty_msat(42, &source, &target, usage), 0);
- assert_ne!(scorer.channel_penalty_msat(42, &source, &target, usage), u64::max_value());
+ assert_ne!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 0);
+ assert_ne!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), u64::max_value());
let usage = ChannelUsage { amount_msat: 61, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), u64::max_value());
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), u64::max_value());
}
#[test]
fn does_not_further_penalize_own_channel() {
let logger = TestLogger::new();
let network_graph = network_graph(&logger);
- let params = ProbabilisticScoringParameters {
+ let params = ProbabilisticScoringFeeParameters {
liquidity_penalty_multiplier_msat: 1_000,
- ..ProbabilisticScoringParameters::zero_penalty()
+ ..ProbabilisticScoringFeeParameters::zero_penalty()
};
- let mut scorer = ProbabilisticScorer::new(params, &network_graph, &logger);
+ let mut scorer = ProbabilisticScorer::new(ProbabilisticScoringDecayParameters::default(), &network_graph, &logger);
let sender = sender_node_id();
let source = source_node_id();
let usage = ChannelUsage {
let failed_path = payment_path_for_amount(500);
let successful_path = payment_path_for_amount(200);
- assert_eq!(scorer.channel_penalty_msat(41, &sender, &source, usage), 301);
+ assert_eq!(scorer.channel_penalty_msat(41, &sender, &source, usage, ¶ms), 301);
- scorer.payment_path_failed(&failed_path.iter().collect::<Vec<_>>(), 41);
- assert_eq!(scorer.channel_penalty_msat(41, &sender, &source, usage), 301);
+ scorer.payment_path_failed(&failed_path, 41);
+ assert_eq!(scorer.channel_penalty_msat(41, &sender, &source, usage, ¶ms), 301);
- scorer.payment_path_successful(&successful_path.iter().collect::<Vec<_>>());
- assert_eq!(scorer.channel_penalty_msat(41, &sender, &source, usage), 301);
+ scorer.payment_path_successful(&successful_path);
+ assert_eq!(scorer.channel_penalty_msat(41, &sender, &source, usage, ¶ms), 301);
}
#[test]
fn sets_liquidity_lower_bound_on_downstream_failure() {
let logger = TestLogger::new();
let network_graph = network_graph(&logger);
- let params = ProbabilisticScoringParameters {
+ let params = ProbabilisticScoringFeeParameters {
liquidity_penalty_multiplier_msat: 1_000,
- ..ProbabilisticScoringParameters::zero_penalty()
+ ..ProbabilisticScoringFeeParameters::zero_penalty()
};
- let mut scorer = ProbabilisticScorer::new(params, &network_graph, &logger);
+ let mut scorer = ProbabilisticScorer::new(ProbabilisticScoringDecayParameters::default(), &network_graph, &logger);
let source = source_node_id();
let target = target_node_id();
let path = payment_path_for_amount(500);
inflight_htlc_msat: 0,
effective_capacity: EffectiveCapacity::Total { capacity_msat: 1_000, htlc_maximum_msat: 1_000 },
};
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 128);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 128);
let usage = ChannelUsage { amount_msat: 500, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 301);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 301);
let usage = ChannelUsage { amount_msat: 750, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 602);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 602);
- scorer.payment_path_failed(&path.iter().collect::<Vec<_>>(), 43);
+ scorer.payment_path_failed(&path, 43);
let usage = ChannelUsage { amount_msat: 250, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 0);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 0);
let usage = ChannelUsage { amount_msat: 500, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 0);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 0);
let usage = ChannelUsage { amount_msat: 750, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 300);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 300);
}
#[test]
fn sets_liquidity_upper_bound_on_failure() {
let logger = TestLogger::new();
let network_graph = network_graph(&logger);
- let params = ProbabilisticScoringParameters {
+ let params = ProbabilisticScoringFeeParameters {
liquidity_penalty_multiplier_msat: 1_000,
considered_impossible_penalty_msat: u64::max_value(),
- ..ProbabilisticScoringParameters::zero_penalty()
+ ..ProbabilisticScoringFeeParameters::zero_penalty()
};
- let mut scorer = ProbabilisticScorer::new(params, &network_graph, &logger);
+ let mut scorer = ProbabilisticScorer::new(ProbabilisticScoringDecayParameters::default(), &network_graph, &logger);
let source = source_node_id();
let target = target_node_id();
let path = payment_path_for_amount(500);
inflight_htlc_msat: 0,
effective_capacity: EffectiveCapacity::Total { capacity_msat: 1_000, htlc_maximum_msat: 1_000 },
};
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 128);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 128);
let usage = ChannelUsage { amount_msat: 500, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 301);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 301);
let usage = ChannelUsage { amount_msat: 750, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 602);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 602);
- scorer.payment_path_failed(&path.iter().collect::<Vec<_>>(), 42);
+ scorer.payment_path_failed(&path, 42);
let usage = ChannelUsage { amount_msat: 250, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 300);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 300);
let usage = ChannelUsage { amount_msat: 500, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), u64::max_value());
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), u64::max_value());
let usage = ChannelUsage { amount_msat: 750, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), u64::max_value());
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), u64::max_value());
}
#[test]
// we do not score such channels.
let secp_ctx = Secp256k1::new();
let logger = TestLogger::new();
- let genesis_hash = genesis_block(Network::Testnet).header.block_hash();
- let mut network_graph = NetworkGraph::new(genesis_hash, &logger);
+ let mut network_graph = NetworkGraph::new(Network::Testnet, &logger);
let secret_a = SecretKey::from_slice(&[42; 32]).unwrap();
let secret_b = SecretKey::from_slice(&[43; 32]).unwrap();
let secret_c = SecretKey::from_slice(&[44; 32]).unwrap();
let node_c = NodeId::from_pubkey(&pub_c);
let node_d = NodeId::from_pubkey(&pub_d);
- let params = ProbabilisticScoringParameters {
+ let params = ProbabilisticScoringFeeParameters {
liquidity_penalty_multiplier_msat: 1_000,
- ..ProbabilisticScoringParameters::zero_penalty()
+ ..ProbabilisticScoringFeeParameters::zero_penalty()
};
- let mut scorer = ProbabilisticScorer::new(params, &network_graph, &logger);
+ let mut scorer = ProbabilisticScorer::new(ProbabilisticScoringDecayParameters::default(), &network_graph, &logger);
let usage = ChannelUsage {
amount_msat: 250,
inflight_htlc_msat: 0,
effective_capacity: EffectiveCapacity::Total { capacity_msat: 1_000, htlc_maximum_msat: 1_000 },
};
- assert_eq!(scorer.channel_penalty_msat(42, &node_a, &node_b, usage), 128);
+ assert_eq!(scorer.channel_penalty_msat(42, &node_a, &node_b, usage, ¶ms), 128);
// Note that a default liquidity bound is used for B -> C as no channel exists
- assert_eq!(scorer.channel_penalty_msat(43, &node_b, &node_c, usage), 128);
- assert_eq!(scorer.channel_penalty_msat(44, &node_c, &node_d, usage), 128);
+ assert_eq!(scorer.channel_penalty_msat(43, &node_b, &node_c, usage, ¶ms), 128);
+ assert_eq!(scorer.channel_penalty_msat(44, &node_c, &node_d, usage, ¶ms), 128);
- scorer.payment_path_failed(&path.iter().collect::<Vec<_>>(), 43);
+ scorer.payment_path_failed(&Path { hops: path, blinded_tail: None }, 43);
- assert_eq!(scorer.channel_penalty_msat(42, &node_a, &node_b, usage), 80);
+ assert_eq!(scorer.channel_penalty_msat(42, &node_a, &node_b, usage, ¶ms), 80);
// Note that a default liquidity bound is used for B -> C as no channel exists
- assert_eq!(scorer.channel_penalty_msat(43, &node_b, &node_c, usage), 128);
- assert_eq!(scorer.channel_penalty_msat(44, &node_c, &node_d, usage), 128);
+ assert_eq!(scorer.channel_penalty_msat(43, &node_b, &node_c, usage, ¶ms), 128);
+ assert_eq!(scorer.channel_penalty_msat(44, &node_c, &node_d, usage, ¶ms), 128);
}
#[test]
fn reduces_liquidity_upper_bound_along_path_on_success() {
let logger = TestLogger::new();
let network_graph = network_graph(&logger);
- let params = ProbabilisticScoringParameters {
+ let params = ProbabilisticScoringFeeParameters {
liquidity_penalty_multiplier_msat: 1_000,
- ..ProbabilisticScoringParameters::zero_penalty()
+ ..ProbabilisticScoringFeeParameters::zero_penalty()
};
- let mut scorer = ProbabilisticScorer::new(params, &network_graph, &logger);
+ let mut scorer = ProbabilisticScorer::new(ProbabilisticScoringDecayParameters::default(), &network_graph, &logger);
let sender = sender_node_id();
let source = source_node_id();
let target = target_node_id();
inflight_htlc_msat: 0,
effective_capacity: EffectiveCapacity::Total { capacity_msat: 1_000, htlc_maximum_msat: 1_000 },
};
- let path = payment_path_for_amount(500);
- assert_eq!(scorer.channel_penalty_msat(41, &sender, &source, usage), 128);
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 128);
- assert_eq!(scorer.channel_penalty_msat(43, &target, &recipient, usage), 128);
+ assert_eq!(scorer.channel_penalty_msat(41, &sender, &source, usage, ¶ms), 128);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 128);
+ assert_eq!(scorer.channel_penalty_msat(43, &target, &recipient, usage, ¶ms), 128);
- scorer.payment_path_successful(&path.iter().collect::<Vec<_>>());
+ scorer.payment_path_successful(&payment_path_for_amount(500));
- assert_eq!(scorer.channel_penalty_msat(41, &sender, &source, usage), 128);
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 300);
- assert_eq!(scorer.channel_penalty_msat(43, &target, &recipient, usage), 300);
+ assert_eq!(scorer.channel_penalty_msat(41, &sender, &source, usage, ¶ms), 128);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 300);
+ assert_eq!(scorer.channel_penalty_msat(43, &target, &recipient, usage, ¶ms), 300);
}
#[test]
fn decays_liquidity_bounds_over_time() {
let logger = TestLogger::new();
let network_graph = network_graph(&logger);
- let params = ProbabilisticScoringParameters {
+ let params = ProbabilisticScoringFeeParameters {
liquidity_penalty_multiplier_msat: 1_000,
- liquidity_offset_half_life: Duration::from_secs(10),
considered_impossible_penalty_msat: u64::max_value(),
- ..ProbabilisticScoringParameters::zero_penalty()
+ ..ProbabilisticScoringFeeParameters::zero_penalty()
};
- let mut scorer = ProbabilisticScorer::new(params, &network_graph, &logger);
+ let decay_params = ProbabilisticScoringDecayParameters {
+ liquidity_offset_half_life: Duration::from_secs(10),
+ ..ProbabilisticScoringDecayParameters::zero_penalty()
+ };
+ let mut scorer = ProbabilisticScorer::new(decay_params, &network_graph, &logger);
let source = source_node_id();
let target = target_node_id();
inflight_htlc_msat: 0,
effective_capacity: EffectiveCapacity::Total { capacity_msat: 1_024, htlc_maximum_msat: 1_024 },
};
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 0);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 0);
let usage = ChannelUsage { amount_msat: 1_023, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 2_000);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 2_000);
- scorer.payment_path_failed(&payment_path_for_amount(768).iter().collect::<Vec<_>>(), 42);
- scorer.payment_path_failed(&payment_path_for_amount(128).iter().collect::<Vec<_>>(), 43);
+ scorer.payment_path_failed(&payment_path_for_amount(768), 42);
+ scorer.payment_path_failed(&payment_path_for_amount(128), 43);
+ // Initial penalties
let usage = ChannelUsage { amount_msat: 128, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 0);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 0);
let usage = ChannelUsage { amount_msat: 256, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 93);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 93);
let usage = ChannelUsage { amount_msat: 768, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 1_479);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 1_479);
let usage = ChannelUsage { amount_msat: 896, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), u64::max_value());
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), u64::max_value());
- SinceEpoch::advance(Duration::from_secs(9));
+ // No decay
+ SinceEpoch::advance(Duration::from_secs(4));
let usage = ChannelUsage { amount_msat: 128, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 0);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 0);
let usage = ChannelUsage { amount_msat: 256, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 93);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 93);
let usage = ChannelUsage { amount_msat: 768, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 1_479);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 1_479);
let usage = ChannelUsage { amount_msat: 896, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), u64::max_value());
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), u64::max_value());
+ // Half decay (i.e., three-quarter life)
SinceEpoch::advance(Duration::from_secs(1));
+ let usage = ChannelUsage { amount_msat: 128, ..usage };
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 22);
+ let usage = ChannelUsage { amount_msat: 256, ..usage };
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 106);
+ let usage = ChannelUsage { amount_msat: 768, ..usage };
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 921);
+ let usage = ChannelUsage { amount_msat: 896, ..usage };
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), u64::max_value());
+
+ // One decay (i.e., half life)
+ SinceEpoch::advance(Duration::from_secs(5));
let usage = ChannelUsage { amount_msat: 64, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 0);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 0);
let usage = ChannelUsage { amount_msat: 128, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 34);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 34);
let usage = ChannelUsage { amount_msat: 896, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 1_970);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 1_970);
let usage = ChannelUsage { amount_msat: 960, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), u64::max_value());
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), u64::max_value());
// Fully decay liquidity lower bound.
SinceEpoch::advance(Duration::from_secs(10 * 7));
let usage = ChannelUsage { amount_msat: 0, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 0);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 0);
let usage = ChannelUsage { amount_msat: 1, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 0);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 0);
let usage = ChannelUsage { amount_msat: 1_023, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 2_000);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 2_000);
let usage = ChannelUsage { amount_msat: 1_024, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), u64::max_value());
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), u64::max_value());
// Fully decay liquidity upper bound.
SinceEpoch::advance(Duration::from_secs(10));
let usage = ChannelUsage { amount_msat: 0, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 0);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 0);
let usage = ChannelUsage { amount_msat: 1_024, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), u64::max_value());
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), u64::max_value());
SinceEpoch::advance(Duration::from_secs(10));
let usage = ChannelUsage { amount_msat: 0, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 0);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 0);
let usage = ChannelUsage { amount_msat: 1_024, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), u64::max_value());
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), u64::max_value());
}
#[test]
fn decays_liquidity_bounds_without_shift_overflow() {
let logger = TestLogger::new();
let network_graph = network_graph(&logger);
- let params = ProbabilisticScoringParameters {
+ let params = ProbabilisticScoringFeeParameters {
liquidity_penalty_multiplier_msat: 1_000,
+ ..ProbabilisticScoringFeeParameters::zero_penalty()
+ };
+ let decay_params = ProbabilisticScoringDecayParameters {
liquidity_offset_half_life: Duration::from_secs(10),
- ..ProbabilisticScoringParameters::zero_penalty()
+ ..ProbabilisticScoringDecayParameters::default()
};
- let mut scorer = ProbabilisticScorer::new(params, &network_graph, &logger);
+ let mut scorer = ProbabilisticScorer::new(decay_params, &network_graph, &logger);
let source = source_node_id();
let target = target_node_id();
let usage = ChannelUsage {
inflight_htlc_msat: 0,
effective_capacity: EffectiveCapacity::Total { capacity_msat: 1_024, htlc_maximum_msat: 1_000 },
};
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 125);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 125);
- scorer.payment_path_failed(&payment_path_for_amount(512).iter().collect::<Vec<_>>(), 42);
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 281);
+ scorer.payment_path_failed(&payment_path_for_amount(512), 42);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 281);
// An unchecked right shift 64 bits or more in DirectedChannelLiquidity::decayed_offset_msat
// would cause an overflow.
SinceEpoch::advance(Duration::from_secs(10 * 64));
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 125);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 125);
SinceEpoch::advance(Duration::from_secs(10));
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 125);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 125);
}
#[test]
fn restricts_liquidity_bounds_after_decay() {
let logger = TestLogger::new();
let network_graph = network_graph(&logger);
- let params = ProbabilisticScoringParameters {
+ let params = ProbabilisticScoringFeeParameters {
liquidity_penalty_multiplier_msat: 1_000,
+ ..ProbabilisticScoringFeeParameters::zero_penalty()
+ };
+ let decay_params = ProbabilisticScoringDecayParameters {
liquidity_offset_half_life: Duration::from_secs(10),
- ..ProbabilisticScoringParameters::zero_penalty()
+ ..ProbabilisticScoringDecayParameters::default()
};
- let mut scorer = ProbabilisticScorer::new(params, &network_graph, &logger);
+ let mut scorer = ProbabilisticScorer::new(decay_params, &network_graph, &logger);
let source = source_node_id();
let target = target_node_id();
let usage = ChannelUsage {
effective_capacity: EffectiveCapacity::Total { capacity_msat: 1_024, htlc_maximum_msat: 1_000 },
};
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 300);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 300);
// More knowledge gives higher confidence (256, 768), meaning a lower penalty.
- scorer.payment_path_failed(&payment_path_for_amount(768).iter().collect::<Vec<_>>(), 42);
- scorer.payment_path_failed(&payment_path_for_amount(256).iter().collect::<Vec<_>>(), 43);
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 281);
+ scorer.payment_path_failed(&payment_path_for_amount(768), 42);
+ scorer.payment_path_failed(&payment_path_for_amount(256), 43);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 281);
// Decaying knowledge gives less confidence (128, 896), meaning a higher penalty.
SinceEpoch::advance(Duration::from_secs(10));
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 291);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 291);
// Reducing the upper bound gives more confidence (128, 832) that the payment amount (512)
// is closer to the upper bound, meaning a higher penalty.
- scorer.payment_path_successful(&payment_path_for_amount(64).iter().collect::<Vec<_>>());
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 331);
+ scorer.payment_path_successful(&payment_path_for_amount(64));
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 331);
// Increasing the lower bound gives more confidence (256, 832) that the payment amount (512)
// is closer to the lower bound, meaning a lower penalty.
- scorer.payment_path_failed(&payment_path_for_amount(256).iter().collect::<Vec<_>>(), 43);
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 245);
+ scorer.payment_path_failed(&payment_path_for_amount(256), 43);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 245);
// Further decaying affects the lower bound more than the upper bound (128, 928).
SinceEpoch::advance(Duration::from_secs(10));
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 280);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 280);
}
#[test]
fn restores_persisted_liquidity_bounds() {
let logger = TestLogger::new();
let network_graph = network_graph(&logger);
- let params = ProbabilisticScoringParameters {
+ let params = ProbabilisticScoringFeeParameters {
liquidity_penalty_multiplier_msat: 1_000,
- liquidity_offset_half_life: Duration::from_secs(10),
considered_impossible_penalty_msat: u64::max_value(),
- ..ProbabilisticScoringParameters::zero_penalty()
+ ..ProbabilisticScoringFeeParameters::zero_penalty()
};
- let mut scorer = ProbabilisticScorer::new(params.clone(), &network_graph, &logger);
+ let decay_params = ProbabilisticScoringDecayParameters {
+ liquidity_offset_half_life: Duration::from_secs(10),
+ ..ProbabilisticScoringDecayParameters::default()
+ };
+ let mut scorer = ProbabilisticScorer::new(decay_params, &network_graph, &logger);
let source = source_node_id();
let target = target_node_id();
let usage = ChannelUsage {
effective_capacity: EffectiveCapacity::Total { capacity_msat: 1_000, htlc_maximum_msat: 1_000 },
};
- scorer.payment_path_failed(&payment_path_for_amount(500).iter().collect::<Vec<_>>(), 42);
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), u64::max_value());
+ scorer.payment_path_failed(&payment_path_for_amount(500), 42);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), u64::max_value());
SinceEpoch::advance(Duration::from_secs(10));
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 473);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 473);
- scorer.payment_path_failed(&payment_path_for_amount(250).iter().collect::<Vec<_>>(), 43);
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 300);
+ scorer.payment_path_failed(&payment_path_for_amount(250), 43);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 300);
let mut serialized_scorer = Vec::new();
scorer.write(&mut serialized_scorer).unwrap();
let mut serialized_scorer = io::Cursor::new(&serialized_scorer);
let deserialized_scorer =
- <ProbabilisticScorer>::read(&mut serialized_scorer, (params, &network_graph, &logger)).unwrap();
- assert_eq!(deserialized_scorer.channel_penalty_msat(42, &source, &target, usage), 300);
+ <ProbabilisticScorer>::read(&mut serialized_scorer, (decay_params, &network_graph, &logger)).unwrap();
+ assert_eq!(deserialized_scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 300);
}
#[test]
fn decays_persisted_liquidity_bounds() {
let logger = TestLogger::new();
let network_graph = network_graph(&logger);
- let params = ProbabilisticScoringParameters {
+ let params = ProbabilisticScoringFeeParameters {
liquidity_penalty_multiplier_msat: 1_000,
- liquidity_offset_half_life: Duration::from_secs(10),
considered_impossible_penalty_msat: u64::max_value(),
- ..ProbabilisticScoringParameters::zero_penalty()
+ ..ProbabilisticScoringFeeParameters::zero_penalty()
+ };
+ let decay_params = ProbabilisticScoringDecayParameters {
+ liquidity_offset_half_life: Duration::from_secs(10),
+ ..ProbabilisticScoringDecayParameters::zero_penalty()
};
- let mut scorer = ProbabilisticScorer::new(params.clone(), &network_graph, &logger);
+ let mut scorer = ProbabilisticScorer::new(decay_params, &network_graph, &logger);
let source = source_node_id();
let target = target_node_id();
let usage = ChannelUsage {
effective_capacity: EffectiveCapacity::Total { capacity_msat: 1_000, htlc_maximum_msat: 1_000 },
};
- scorer.payment_path_failed(&payment_path_for_amount(500).iter().collect::<Vec<_>>(), 42);
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), u64::max_value());
+ scorer.payment_path_failed(&payment_path_for_amount(500), 42);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), u64::max_value());
let mut serialized_scorer = Vec::new();
scorer.write(&mut serialized_scorer).unwrap();
let mut serialized_scorer = io::Cursor::new(&serialized_scorer);
let deserialized_scorer =
- <ProbabilisticScorer>::read(&mut serialized_scorer, (params, &network_graph, &logger)).unwrap();
- assert_eq!(deserialized_scorer.channel_penalty_msat(42, &source, &target, usage), 473);
+ <ProbabilisticScorer>::read(&mut serialized_scorer, (decay_params, &network_graph, &logger)).unwrap();
+ assert_eq!(deserialized_scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 473);
- scorer.payment_path_failed(&payment_path_for_amount(250).iter().collect::<Vec<_>>(), 43);
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 300);
+ scorer.payment_path_failed(&payment_path_for_amount(250), 43);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 300);
SinceEpoch::advance(Duration::from_secs(10));
- assert_eq!(deserialized_scorer.channel_penalty_msat(42, &source, &target, usage), 365);
+ assert_eq!(deserialized_scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 370);
}
#[test]
// 50k sat reserve).
let logger = TestLogger::new();
let network_graph = network_graph(&logger);
- let params = ProbabilisticScoringParameters::default();
- let scorer = ProbabilisticScorer::new(params, &network_graph, &logger);
+ let params = ProbabilisticScoringFeeParameters::default();
+ let scorer = ProbabilisticScorer::new(ProbabilisticScoringDecayParameters::default(), &network_graph, &logger);
let source = source_node_id();
let target = target_node_id();
inflight_htlc_msat: 0,
effective_capacity: EffectiveCapacity::Total { capacity_msat: 950_000_000, htlc_maximum_msat: 1_000 },
};
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 4375);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 11497);
let usage = ChannelUsage {
effective_capacity: EffectiveCapacity::Total { capacity_msat: 1_950_000_000, htlc_maximum_msat: 1_000 }, ..usage
};
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 2739);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 7408);
let usage = ChannelUsage {
effective_capacity: EffectiveCapacity::Total { capacity_msat: 2_950_000_000, htlc_maximum_msat: 1_000 }, ..usage
};
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 2236);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 6151);
let usage = ChannelUsage {
effective_capacity: EffectiveCapacity::Total { capacity_msat: 3_950_000_000, htlc_maximum_msat: 1_000 }, ..usage
};
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 1983);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 5427);
let usage = ChannelUsage {
effective_capacity: EffectiveCapacity::Total { capacity_msat: 4_950_000_000, htlc_maximum_msat: 1_000 }, ..usage
};
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 1637);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 4955);
let usage = ChannelUsage {
effective_capacity: EffectiveCapacity::Total { capacity_msat: 5_950_000_000, htlc_maximum_msat: 1_000 }, ..usage
};
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 1606);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 4736);
let usage = ChannelUsage {
effective_capacity: EffectiveCapacity::Total { capacity_msat: 6_950_000_000, htlc_maximum_msat: 1_000 }, ..usage
};
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 1331);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 4484);
let usage = ChannelUsage {
effective_capacity: EffectiveCapacity::Total { capacity_msat: 7_450_000_000, htlc_maximum_msat: 1_000 }, ..usage
};
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 1387);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 4484);
let usage = ChannelUsage {
effective_capacity: EffectiveCapacity::Total { capacity_msat: 7_950_000_000, htlc_maximum_msat: 1_000 }, ..usage
};
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 1379);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 4263);
let usage = ChannelUsage {
effective_capacity: EffectiveCapacity::Total { capacity_msat: 8_950_000_000, htlc_maximum_msat: 1_000 }, ..usage
};
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 1363);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 4263);
let usage = ChannelUsage {
effective_capacity: EffectiveCapacity::Total { capacity_msat: 9_950_000_000, htlc_maximum_msat: 1_000 }, ..usage
};
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 1355);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 4044);
}
#[test]
effective_capacity: EffectiveCapacity::Total { capacity_msat: 1_024, htlc_maximum_msat: 1_000 },
};
- let params = ProbabilisticScoringParameters {
+ let params = ProbabilisticScoringFeeParameters {
liquidity_penalty_multiplier_msat: 1_000,
- ..ProbabilisticScoringParameters::zero_penalty()
+ ..ProbabilisticScoringFeeParameters::zero_penalty()
};
- let scorer = ProbabilisticScorer::new(params, &network_graph, &logger);
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 58);
+ let scorer = ProbabilisticScorer::new(ProbabilisticScoringDecayParameters::default(), &network_graph, &logger);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 58);
- let params = ProbabilisticScoringParameters {
+ let params = ProbabilisticScoringFeeParameters {
base_penalty_msat: 500, liquidity_penalty_multiplier_msat: 1_000,
- anti_probing_penalty_msat: 0, ..ProbabilisticScoringParameters::zero_penalty()
+ anti_probing_penalty_msat: 0, ..ProbabilisticScoringFeeParameters::zero_penalty()
};
- let scorer = ProbabilisticScorer::new(params, &network_graph, &logger);
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 558);
+ let scorer = ProbabilisticScorer::new(ProbabilisticScoringDecayParameters::default(), &network_graph, &logger);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 558);
- let params = ProbabilisticScoringParameters {
+ let params = ProbabilisticScoringFeeParameters {
base_penalty_msat: 500, liquidity_penalty_multiplier_msat: 1_000,
base_penalty_amount_multiplier_msat: (1 << 30),
- anti_probing_penalty_msat: 0, ..ProbabilisticScoringParameters::zero_penalty()
+ anti_probing_penalty_msat: 0, ..ProbabilisticScoringFeeParameters::zero_penalty()
};
- let scorer = ProbabilisticScorer::new(params, &network_graph, &logger);
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 558 + 128);
+ let scorer = ProbabilisticScorer::new(ProbabilisticScoringDecayParameters::default(), &network_graph, &logger);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 558 + 128);
}
#[test]
effective_capacity: EffectiveCapacity::Total { capacity_msat: 1_024_000, htlc_maximum_msat: 1_000 },
};
- let params = ProbabilisticScoringParameters {
+ let params = ProbabilisticScoringFeeParameters {
liquidity_penalty_multiplier_msat: 1_000,
liquidity_penalty_amount_multiplier_msat: 0,
- ..ProbabilisticScoringParameters::zero_penalty()
+ ..ProbabilisticScoringFeeParameters::zero_penalty()
};
- let scorer = ProbabilisticScorer::new(params, &network_graph, &logger);
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 300);
+ let scorer = ProbabilisticScorer::new(ProbabilisticScoringDecayParameters::default(), &network_graph, &logger);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 300);
- let params = ProbabilisticScoringParameters {
+ let params = ProbabilisticScoringFeeParameters {
liquidity_penalty_multiplier_msat: 1_000,
liquidity_penalty_amount_multiplier_msat: 256,
- ..ProbabilisticScoringParameters::zero_penalty()
+ ..ProbabilisticScoringFeeParameters::zero_penalty()
};
- let scorer = ProbabilisticScorer::new(params, &network_graph, &logger);
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 337);
+ let scorer = ProbabilisticScorer::new(ProbabilisticScoringDecayParameters::default(), &network_graph, &logger);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 337);
}
#[test]
effective_capacity: EffectiveCapacity::Infinite,
};
- let params = ProbabilisticScoringParameters {
+ let params = ProbabilisticScoringFeeParameters {
liquidity_penalty_multiplier_msat: 40_000,
- ..ProbabilisticScoringParameters::zero_penalty()
+ ..ProbabilisticScoringFeeParameters::zero_penalty()
};
- let scorer = ProbabilisticScorer::new(params, &network_graph, &logger);
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 80_000);
+ let decay_params = ProbabilisticScoringDecayParameters::zero_penalty();
+ let scorer = ProbabilisticScorer::new(decay_params, &network_graph, &logger);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 80_000);
}
#[test]
fn accounts_for_inflight_htlc_usage() {
let logger = TestLogger::new();
let network_graph = network_graph(&logger);
- let params = ProbabilisticScoringParameters {
+ let params = ProbabilisticScoringFeeParameters {
considered_impossible_penalty_msat: u64::max_value(),
- ..ProbabilisticScoringParameters::zero_penalty()
+ ..ProbabilisticScoringFeeParameters::zero_penalty()
};
- let scorer = ProbabilisticScorer::new(params, &network_graph, &logger);
+ let scorer = ProbabilisticScorer::new(ProbabilisticScoringDecayParameters::default(), &network_graph, &logger);
let source = source_node_id();
let target = target_node_id();
inflight_htlc_msat: 0,
effective_capacity: EffectiveCapacity::Total { capacity_msat: 1_000, htlc_maximum_msat: 1_000 },
};
- assert_ne!(scorer.channel_penalty_msat(42, &source, &target, usage), u64::max_value());
+ assert_ne!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), u64::max_value());
let usage = ChannelUsage { inflight_htlc_msat: 251, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), u64::max_value());
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), u64::max_value());
}
#[test]
fn removes_uncertainity_when_exact_liquidity_known() {
let logger = TestLogger::new();
let network_graph = network_graph(&logger);
- let params = ProbabilisticScoringParameters::default();
- let scorer = ProbabilisticScorer::new(params.clone(), &network_graph, &logger);
+ let params = ProbabilisticScoringFeeParameters::default();
+ let scorer = ProbabilisticScorer::new(ProbabilisticScoringDecayParameters::default(), &network_graph, &logger);
let source = source_node_id();
let target = target_node_id();
inflight_htlc_msat: 0,
effective_capacity: EffectiveCapacity::ExactLiquidity { liquidity_msat: 1_000 },
};
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), base_penalty_msat);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), base_penalty_msat);
let usage = ChannelUsage { amount_msat: 1_000, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), base_penalty_msat);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), base_penalty_msat);
let usage = ChannelUsage { amount_msat: 1_001, ..usage };
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), u64::max_value());
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), u64::max_value());
}
#[test]
fn remembers_historical_failures() {
let logger = TestLogger::new();
let network_graph = network_graph(&logger);
- let params = ProbabilisticScoringParameters {
+ let params = ProbabilisticScoringFeeParameters {
historical_liquidity_penalty_multiplier_msat: 1024,
historical_liquidity_penalty_amount_multiplier_msat: 1024,
+ ..ProbabilisticScoringFeeParameters::zero_penalty()
+ };
+ let decay_params = ProbabilisticScoringDecayParameters {
+ liquidity_offset_half_life: Duration::from_secs(60 * 60),
historical_no_updates_half_life: Duration::from_secs(10),
- ..ProbabilisticScoringParameters::zero_penalty()
};
- let mut scorer = ProbabilisticScorer::new(params, &network_graph, &logger);
+ let mut scorer = ProbabilisticScorer::new(decay_params, &network_graph, &logger);
let source = source_node_id();
let target = target_node_id();
inflight_htlc_msat: 0,
effective_capacity: EffectiveCapacity::Total { capacity_msat: 1_024, htlc_maximum_msat: 1_024 },
};
- // With no historical data the normal liquidity penalty calculation is used.
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 47);
+ let usage_1 = ChannelUsage {
+ amount_msat: 1,
+ inflight_htlc_msat: 0,
+ effective_capacity: EffectiveCapacity::Total { capacity_msat: 1_024, htlc_maximum_msat: 1_024 },
+ };
- scorer.payment_path_failed(&payment_path_for_amount(1).iter().collect::<Vec<_>>(), 42);
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 2048);
+ // With no historical data the normal liquidity penalty calculation is used.
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 168);
+ assert_eq!(scorer.historical_estimated_channel_liquidity_probabilities(42, &target),
+ None);
+ assert_eq!(scorer.historical_estimated_payment_success_probability(42, &target, 42, ¶ms),
+ None);
+
+ scorer.payment_path_failed(&payment_path_for_amount(1), 42);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 2048);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage_1, ¶ms), 249);
+ // The "it failed" increment is 32, where the probability should lie several buckets into
+ // the first octile.
+ assert_eq!(scorer.historical_estimated_channel_liquidity_probabilities(42, &target),
+ Some(([32, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+ [0, 0, 0, 0, 0, 0, 32, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0])));
+ assert!(scorer.historical_estimated_payment_success_probability(42, &target, 1, ¶ms)
+ .unwrap() > 0.35);
+ assert_eq!(scorer.historical_estimated_payment_success_probability(42, &target, 500, ¶ms),
+ Some(0.0));
// Even after we tell the scorer we definitely have enough available liquidity, it will
// still remember that there was some failure in the past, and assign a non-0 penalty.
- scorer.payment_path_failed(&payment_path_for_amount(1000).iter().collect::<Vec<_>>(), 43);
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 198);
+ scorer.payment_path_failed(&payment_path_for_amount(1000), 43);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 105);
+ // The first points should be decayed just slightly and the last bucket has a new point.
+ assert_eq!(scorer.historical_estimated_channel_liquidity_probabilities(42, &target),
+ Some(([31, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 32, 0, 0, 0, 0, 0],
+ [0, 0, 0, 0, 0, 0, 31, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 32])));
+
+ // The exact success probability is a bit complicated and involves integer rounding, so we
+ // simply check bounds here.
+ let five_hundred_prob =
+ scorer.historical_estimated_payment_success_probability(42, &target, 500, ¶ms).unwrap();
+ assert!(five_hundred_prob > 0.59);
+ assert!(five_hundred_prob < 0.60);
+ let one_prob =
+ scorer.historical_estimated_payment_success_probability(42, &target, 1, ¶ms).unwrap();
+ assert!(one_prob < 0.85);
+ assert!(one_prob > 0.84);
// Advance the time forward 16 half-lives (which the docs claim will ensure all data is
// gone), and check that we're back to where we started.
SinceEpoch::advance(Duration::from_secs(10 * 16));
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 47);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 168);
+ // Once fully decayed we still have data, but its all-0s. In the future we may remove the
+ // data entirely instead.
+ assert_eq!(scorer.historical_estimated_channel_liquidity_probabilities(42, &target),
+ None);
+ assert_eq!(scorer.historical_estimated_payment_success_probability(42, &target, 1, ¶ms), None);
+
+ let mut usage = ChannelUsage {
+ amount_msat: 100,
+ inflight_htlc_msat: 1024,
+ effective_capacity: EffectiveCapacity::Total { capacity_msat: 1_024, htlc_maximum_msat: 1_024 },
+ };
+ scorer.payment_path_failed(&payment_path_for_amount(1), 42);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 2050);
+ usage.inflight_htlc_msat = 0;
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 866);
+
+ let usage = ChannelUsage {
+ amount_msat: 1,
+ inflight_htlc_msat: 0,
+ effective_capacity: EffectiveCapacity::AdvertisedMaxHTLC { amount_msat: 0 },
+ };
+ assert_eq!(scorer.channel_penalty_msat(42, &target, &source, usage, ¶ms), 2048);
+
+ // Advance to decay all liquidity offsets to zero.
+ SinceEpoch::advance(Duration::from_secs(60 * 60 * 10));
+
+ // Use a path in the opposite direction, which have zero for htlc_maximum_msat. This will
+ // ensure that the effective capacity is zero to test division-by-zero edge cases.
+ let path = vec![
+ path_hop(target_pubkey(), 43, 2),
+ path_hop(source_pubkey(), 42, 1),
+ path_hop(sender_pubkey(), 41, 0),
+ ];
+ scorer.payment_path_failed(&Path { hops: path, blinded_tail: None }, 42);
}
#[test]
let network_graph = network_graph(&logger);
let source = source_node_id();
let target = target_node_id();
- let params = ProbabilisticScoringParameters {
+ let params = ProbabilisticScoringFeeParameters {
anti_probing_penalty_msat: 500,
- ..ProbabilisticScoringParameters::zero_penalty()
+ ..ProbabilisticScoringFeeParameters::zero_penalty()
};
- let scorer = ProbabilisticScorer::new(params, &network_graph, &logger);
+ let scorer = ProbabilisticScorer::new(ProbabilisticScoringDecayParameters::default(), &network_graph, &logger);
// Check we receive no penalty for a low htlc_maximum_msat.
let usage = ChannelUsage {
inflight_htlc_msat: 0,
effective_capacity: EffectiveCapacity::Total { capacity_msat: 1_024_000, htlc_maximum_msat: 1_000 },
};
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 0);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 0);
// Check we receive anti-probing penalty for htlc_maximum_msat == channel_capacity.
let usage = ChannelUsage {
inflight_htlc_msat: 0,
effective_capacity: EffectiveCapacity::Total { capacity_msat: 1_024_000, htlc_maximum_msat: 1_024_000 },
};
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 500);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 500);
// Check we receive anti-probing penalty for htlc_maximum_msat == channel_capacity/2.
let usage = ChannelUsage {
inflight_htlc_msat: 0,
effective_capacity: EffectiveCapacity::Total { capacity_msat: 1_024_000, htlc_maximum_msat: 512_000 },
};
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 500);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 500);
// Check we receive no anti-probing penalty for htlc_maximum_msat == channel_capacity/2 - 1.
let usage = ChannelUsage {
inflight_htlc_msat: 0,
effective_capacity: EffectiveCapacity::Total { capacity_msat: 1_024_000, htlc_maximum_msat: 511_999 },
};
- assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage), 0);
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 0);
+ }
+
+ #[test]
+ fn scores_with_blinded_path() {
+ // Make sure we'll account for a blinded path's final_value_msat in scoring
+ let logger = TestLogger::new();
+ let network_graph = network_graph(&logger);
+ let params = ProbabilisticScoringFeeParameters {
+ liquidity_penalty_multiplier_msat: 1_000,
+ ..ProbabilisticScoringFeeParameters::zero_penalty()
+ };
+ let decay_params = ProbabilisticScoringDecayParameters::default();
+ let mut scorer = ProbabilisticScorer::new(decay_params, &network_graph, &logger);
+ let source = source_node_id();
+ let target = target_node_id();
+ let usage = ChannelUsage {
+ amount_msat: 512,
+ inflight_htlc_msat: 0,
+ effective_capacity: EffectiveCapacity::Total { capacity_msat: 1_024, htlc_maximum_msat: 1_000 },
+ };
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 300);
+
+ let mut path = payment_path_for_amount(768);
+ let recipient_hop = path.hops.pop().unwrap();
+ let blinded_path = BlindedPath {
+ introduction_node_id: path.hops.last().as_ref().unwrap().pubkey,
+ blinding_point: test_utils::pubkey(42),
+ blinded_hops: vec![
+ BlindedHop { blinded_node_id: test_utils::pubkey(44), encrypted_payload: Vec::new() }
+ ],
+ };
+ path.blinded_tail = Some(BlindedTail {
+ hops: blinded_path.blinded_hops,
+ blinding_point: blinded_path.blinding_point,
+ excess_final_cltv_expiry_delta: recipient_hop.cltv_expiry_delta,
+ final_value_msat: recipient_hop.fee_msat,
+ });
+
+ // Check the liquidity before and after scoring payment failures to ensure the blinded path's
+ // final value is taken into account.
+ assert!(scorer.channel_liquidities.get(&42).is_none());
+
+ scorer.payment_path_failed(&path, 42);
+ path.blinded_tail.as_mut().unwrap().final_value_msat = 256;
+ scorer.payment_path_failed(&path, 43);
+
+ let liquidity = scorer.channel_liquidities.get(&42).unwrap()
+ .as_directed(&source, &target, 1_000, decay_params);
+ assert_eq!(liquidity.min_liquidity_msat(), 256);
+ assert_eq!(liquidity.max_liquidity_msat(), 768);
+ }
+
+ #[test]
+ fn realistic_historical_failures() {
+ // The motivation for the unequal sized buckets came largely from attempting to pay 10k
+ // sats over a one bitcoin channel. This tests that case explicitly, ensuring that we score
+ // properly.
+ let logger = TestLogger::new();
+ let mut network_graph = network_graph(&logger);
+ let params = ProbabilisticScoringFeeParameters {
+ historical_liquidity_penalty_multiplier_msat: 1024,
+ historical_liquidity_penalty_amount_multiplier_msat: 1024,
+ ..ProbabilisticScoringFeeParameters::zero_penalty()
+ };
+ let decay_params = ProbabilisticScoringDecayParameters {
+ liquidity_offset_half_life: Duration::from_secs(60 * 60),
+ historical_no_updates_half_life: Duration::from_secs(10),
+ ..ProbabilisticScoringDecayParameters::default()
+ };
+
+ let capacity_msat = 100_000_000_000;
+ update_channel(&mut network_graph, 42, source_privkey(), 0, capacity_msat, 200);
+ update_channel(&mut network_graph, 42, target_privkey(), 1, capacity_msat, 200);
+
+ let mut scorer = ProbabilisticScorer::new(decay_params, &network_graph, &logger);
+ let source = source_node_id();
+ let target = target_node_id();
+
+ let mut amount_msat = 10_000_000;
+ let usage = ChannelUsage {
+ amount_msat,
+ inflight_htlc_msat: 0,
+ effective_capacity: EffectiveCapacity::Total { capacity_msat, htlc_maximum_msat: capacity_msat },
+ };
+ // With no historical data the normal liquidity penalty calculation is used, which results
+ // in a success probability of ~75%.
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms), 1269);
+ assert_eq!(scorer.historical_estimated_channel_liquidity_probabilities(42, &target),
+ None);
+ assert_eq!(scorer.historical_estimated_payment_success_probability(42, &target, 42, ¶ms),
+ None);
+
+ // Fail to pay once, and then check the buckets and penalty.
+ scorer.payment_path_failed(&payment_path_for_amount(amount_msat), 42);
+ // The penalty should be the maximum penalty, as the payment we're scoring is now in the
+ // same bucket which is the only maximum datapoint.
+ assert_eq!(scorer.channel_penalty_msat(42, &source, &target, usage, ¶ms),
+ 2048 + 2048 * amount_msat / super::AMOUNT_PENALTY_DIVISOR);
+ // The "it failed" increment is 32, which we should apply to the first upper-bound (between
+ // 6k sats and 12k sats).
+ assert_eq!(scorer.historical_estimated_channel_liquidity_probabilities(42, &target),
+ Some(([32, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+ [0, 32, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0])));
+ // The success probability estimate itself should be zero.
+ assert_eq!(scorer.historical_estimated_payment_success_probability(42, &target, amount_msat, ¶ms),
+ Some(0.0));
+
+ // Now test again with the amount in the bottom bucket.
+ amount_msat /= 2;
+ // The new amount is entirely within the only minimum bucket with score, so the probability
+ // we assign is 1/2.
+ assert_eq!(scorer.historical_estimated_payment_success_probability(42, &target, amount_msat, ¶ms),
+ Some(0.5));
+
+ // ...but once we see a failure, we consider the payment to be substantially less likely,
+ // even though not a probability of zero as we still look at the second max bucket which
+ // now shows 31.
+ scorer.payment_path_failed(&payment_path_for_amount(amount_msat), 42);
+ assert_eq!(scorer.historical_estimated_channel_liquidity_probabilities(42, &target),
+ Some(([63, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
+ [32, 31, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0])));
+ assert_eq!(scorer.historical_estimated_payment_success_probability(42, &target, amount_msat, ¶ms),
+ Some(0.0));
}
}
projects / rust-lightning / blobdiff