1 // This file is Copyright its original authors, visible in version control
4 // This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
5 // or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
6 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
7 // You may not use this file except in accordance with one or both of these
10 //! Structs and impls for receiving messages about the network and storing the topology live here.
12 pub mod network_graph;
16 use routing::network_graph::NodeId;
17 use routing::router::RouteHop;
19 use sync::{Mutex, MutexGuard};
21 use util::ser::{Writeable, Writer};
24 /// An interface used to score payment channels for path finding.
26 /// Scoring is in terms of fees willing to be paid in order to avoid routing through a channel.
27 pub trait Score : Writeable {
28 /// Returns the fee in msats willing to be paid to avoid routing through the given channel
29 /// in the direction from `source` to `target`.
30 fn channel_penalty_msat(&self, short_channel_id: u64, source: &NodeId, target: &NodeId) -> u64;
32 /// Handles updating channel penalties after failing to route through a channel.
33 fn payment_path_failed(&mut self, path: &[&RouteHop], short_channel_id: u64);
36 /// A scorer that is accessed under a lock.
38 /// Needed so that calls to [`Score::channel_penalty_msat`] in [`find_route`] can be made while
39 /// having shared ownership of a scorer but without requiring internal locking in [`Score`]
40 /// implementations. Internal locking would be detrimental to route finding performance and could
41 /// result in [`Score::channel_penalty_msat`] returning a different value for the same channel.
43 /// [`find_route`]: crate::routing::router::find_route
44 pub struct LockableScore<S: Score> {
48 impl<S: Score> LockableScore<S> {
49 /// Constructs a new LockableScore from a Score
50 pub fn new(score: S) -> Self {
51 Self { scorer: Mutex::new(score) }
53 /// Returns the locked scorer.
55 pub fn lock<'a>(&'a self) -> MutexGuard<'a, S> {
56 self.scorer.lock().unwrap()
60 impl<S: Score> Writeable for LockableScore<S> {
62 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
63 self.scorer.lock().unwrap().write(w)