//! and payee using information provided by the payer and from the payee's [`Invoice`], when
//! applicable.
//!
+//! [`InvoicePayer`] is parameterized by a [`LockableScore`], which it uses for scoring failed and
+//! successful payment paths upon receiving [`Event::PaymentPathFailed`] and
+//! [`Event::PaymentPathSuccessful`] events, respectively.
+//!
//! [`InvoicePayer`] is capable of retrying failed payments. It accomplishes this by implementing
//! [`EventHandler`] which decorates a user-provided handler. It will intercept any
//! [`Event::PaymentPathFailed`] events and retry the failed paths for a fixed number of total
//! # use lightning::ln::{PaymentHash, PaymentPreimage, PaymentSecret};
//! # use lightning::ln::channelmanager::{ChannelDetails, PaymentId, PaymentSendFailure};
//! # use lightning::ln::msgs::LightningError;
-//! # use lightning::routing;
+//! # use lightning::routing::scoring::Score;
//! # use lightning::routing::network_graph::NodeId;
//! # use lightning::routing::router::{Route, RouteHop, RouteParameters};
//! # use lightning::util::events::{Event, EventHandler, EventsProvider};
//! # use lightning::util::logger::{Logger, Record};
+//! # use lightning::util::ser::{Writeable, Writer};
//! # use lightning_invoice::Invoice;
//! # use lightning_invoice::payment::{InvoicePayer, Payer, RetryAttempts, Router};
//! # use secp256k1::key::PublicKey;
//! # ) -> Result<(), PaymentSendFailure> { unimplemented!() }
//! # }
//! #
-//! # struct FakeRouter {};
-//! # impl<S: routing::Score> Router<S> for FakeRouter {
+//! # struct FakeRouter {}
+//! # impl<S: Score> Router<S> for FakeRouter {
//! # fn find_route(
-//! # &self, payer: &PublicKey, params: &RouteParameters,
+//! # &self, payer: &PublicKey, params: &RouteParameters, payment_hash: &PaymentHash,
//! # first_hops: Option<&[&ChannelDetails]>, scorer: &S
//! # ) -> Result<Route, LightningError> { unimplemented!() }
//! # }
//! #
-//! # struct FakeScorer {};
-//! # impl routing::Score for FakeScorer {
+//! # struct FakeScorer {}
+//! # impl Writeable for FakeScorer {
+//! # fn write<W: Writer>(&self, w: &mut W) -> Result<(), std::io::Error> { unimplemented!(); }
+//! # }
+//! # impl Score for FakeScorer {
//! # fn channel_penalty_msat(
-//! # &self, _short_channel_id: u64, _source: &NodeId, _target: &NodeId
+//! # &self, _short_channel_id: u64, _send_amt: u64, _chan_amt: Option<u64>, _source: &NodeId, _target: &NodeId
//! # ) -> u64 { 0 }
//! # fn payment_path_failed(&mut self, _path: &[&RouteHop], _short_channel_id: u64) {}
+//! # fn payment_path_successful(&mut self, _path: &[&RouteHop]) {}
//! # }
//! #
-//! # struct FakeLogger {};
+//! # struct FakeLogger {}
//! # impl Logger for FakeLogger {
//! # fn log(&self, record: &Record) { unimplemented!() }
//! # }
//! let invoice_payer = InvoicePayer::new(&payer, router, &scorer, &logger, event_handler, RetryAttempts(2));
//!
//! let invoice = "...";
-//! let invoice = invoice.parse::<Invoice>().unwrap();
-//! invoice_payer.pay_invoice(&invoice).unwrap();
+//! if let Ok(invoice) = invoice.parse::<Invoice>() {
+//! invoice_payer.pay_invoice(&invoice).unwrap();
//!
//! # let event_provider = FakeEventProvider {};
-//! loop {
-//! event_provider.process_pending_events(&invoice_payer);
+//! loop {
+//! event_provider.process_pending_events(&invoice_payer);
+//! }
//! }
//! # }
//! ```
use lightning::ln::{PaymentHash, PaymentPreimage, PaymentSecret};
use lightning::ln::channelmanager::{ChannelDetails, PaymentId, PaymentSendFailure};
use lightning::ln::msgs::LightningError;
-use lightning::routing;
-use lightning::routing::{LockableScore, Score};
+use lightning::routing::scoring::{LockableScore, Score};
use lightning::routing::router::{Payee, Route, RouteParameters};
use lightning::util::events::{Event, EventHandler};
use lightning::util::logger::Logger;
use std::time::{Duration, SystemTime};
/// A utility for paying [`Invoice`]s and sending spontaneous payments.
+///
+/// See [module-level documentation] for details.
+///
+/// [module-level documentation]: crate::payment
pub struct InvoicePayer<P: Deref, R, S: Deref, L: Deref, E>
where
P::Target: Payer,
- R: for <'a> Router<<<S as Deref>::Target as routing::LockableScore<'a>>::Locked>,
- S::Target: for <'a> routing::LockableScore<'a>,
+ R: for <'a> Router<<<S as Deref>::Target as LockableScore<'a>>::Locked>,
+ S::Target: for <'a> LockableScore<'a>,
L::Target: Logger,
E: EventHandler,
{
}
/// A trait defining behavior for routing an [`Invoice`] payment.
-pub trait Router<S: routing::Score> {
+pub trait Router<S: Score> {
/// Finds a [`Route`] between `payer` and `payee` for a payment with the given values.
fn find_route(
- &self, payer: &PublicKey, params: &RouteParameters, first_hops: Option<&[&ChannelDetails]>,
- scorer: &S
+ &self, payer: &PublicKey, params: &RouteParameters, payment_hash: &PaymentHash,
+ first_hops: Option<&[&ChannelDetails]>, scorer: &S
) -> Result<Route, LightningError>;
}
impl<P: Deref, R, S: Deref, L: Deref, E> InvoicePayer<P, R, S, L, E>
where
P::Target: Payer,
- R: for <'a> Router<<<S as Deref>::Target as routing::LockableScore<'a>>::Locked>,
- S::Target: for <'a> routing::LockableScore<'a>,
+ R: for <'a> Router<<<S as Deref>::Target as LockableScore<'a>>::Locked>,
+ S::Target: for <'a> LockableScore<'a>,
L::Target: Logger,
E: EventHandler,
{
let payer = self.payer.node_id();
let first_hops = self.payer.first_hops();
let route = self.router.find_route(
- &payer,
- params,
- Some(&first_hops.iter().collect::<Vec<_>>()),
- &self.scorer.lock(),
+ &payer, params, &payment_hash, Some(&first_hops.iter().collect::<Vec<_>>()),
+ &self.scorer.lock()
).map_err(|e| PaymentError::Routing(e))?;
match send_payment(&route) {
let payer = self.payer.node_id();
let first_hops = self.payer.first_hops();
- let route = self.router.find_route(&payer, ¶ms, Some(&first_hops.iter().collect::<Vec<_>>()), &self.scorer.lock());
+ let route = self.router.find_route(
+ &payer, ¶ms, &payment_hash, Some(&first_hops.iter().collect::<Vec<_>>()),
+ &self.scorer.lock()
+ );
if route.is_err() {
log_trace!(self.logger, "Failed to find a route for payment {}; not retrying (attempts: {})", log_bytes!(payment_hash.0), attempts);
return Err(());
impl<P: Deref, R, S: Deref, L: Deref, E> EventHandler for InvoicePayer<P, R, S, L, E>
where
P::Target: Payer,
- R: for <'a> Router<<<S as Deref>::Target as routing::LockableScore<'a>>::Locked>,
- S::Target: for <'a> routing::LockableScore<'a>,
+ R: for <'a> Router<<<S as Deref>::Target as LockableScore<'a>>::Locked>,
+ S::Target: for <'a> LockableScore<'a>,
L::Target: Logger,
E: EventHandler,
{
if *all_paths_failed { self.payment_cache.lock().unwrap().remove(payment_hash); }
},
+ Event::PaymentPathSuccessful { path, .. } => {
+ let path = path.iter().collect::<Vec<_>>();
+ self.scorer.lock().payment_path_successful(&path);
+ },
Event::PaymentSent { payment_hash, .. } => {
let mut payment_cache = self.payment_cache.lock().unwrap();
let attempts = payment_cache
assert_eq!(*payer.attempts.borrow(), 2);
}
+ #[test]
+ fn pays_invoice_on_partial_failure() {
+ let event_handler = |_: &_| { panic!() };
+
+ let payment_preimage = PaymentPreimage([1; 32]);
+ let invoice = invoice(payment_preimage);
+ let retry = TestRouter::retry_for_invoice(&invoice);
+ let final_value_msat = invoice.amount_milli_satoshis().unwrap();
+
+ let payer = TestPayer::new()
+ .fails_with_partial_failure(retry.clone(), OnAttempt(1))
+ .fails_with_partial_failure(retry, OnAttempt(2))
+ .expect_send(Amount::ForInvoice(final_value_msat))
+ .expect_send(Amount::OnRetry(final_value_msat / 2))
+ .expect_send(Amount::OnRetry(final_value_msat / 2));
+ let router = TestRouter {};
+ let scorer = RefCell::new(TestScorer::new());
+ let logger = TestLogger::new();
+ let invoice_payer =
+ InvoicePayer::new(&payer, router, &scorer, &logger, event_handler, RetryAttempts(2));
+
+ assert!(invoice_payer.pay_invoice(&invoice).is_ok());
+ }
+
#[test]
fn retries_payment_path_for_unknown_payment() {
let event_handled = core::cell::RefCell::new(false);
.expect_send(Amount::ForInvoice(final_value_msat))
.expect_send(Amount::OnRetry(final_value_msat / 2));
let router = TestRouter {};
- let scorer = RefCell::new(TestScorer::new().expect_channel_failure(short_channel_id.unwrap()));
+ let scorer = RefCell::new(TestScorer::new().expect(PaymentPath::Failure {
+ path: path.clone(), short_channel_id: path[0].short_channel_id,
+ }));
let logger = TestLogger::new();
let invoice_payer =
InvoicePayer::new(&payer, router, &scorer, &logger, event_handler, RetryAttempts(2));
invoice_payer.handle_event(&event);
}
+ #[test]
+ fn scores_successful_channels() {
+ let event_handled = core::cell::RefCell::new(false);
+ let event_handler = |_: &_| { *event_handled.borrow_mut() = true; };
+
+ let payment_preimage = PaymentPreimage([1; 32]);
+ let invoice = invoice(payment_preimage);
+ let payment_hash = Some(PaymentHash(invoice.payment_hash().clone().into_inner()));
+ let final_value_msat = invoice.amount_milli_satoshis().unwrap();
+ let route = TestRouter::route_for_value(final_value_msat);
+
+ // Expect that scorer is given short_channel_id upon handling the event.
+ let payer = TestPayer::new().expect_send(Amount::ForInvoice(final_value_msat));
+ let router = TestRouter {};
+ let scorer = RefCell::new(TestScorer::new()
+ .expect(PaymentPath::Success { path: route.paths[0].clone() })
+ .expect(PaymentPath::Success { path: route.paths[1].clone() })
+ );
+ let logger = TestLogger::new();
+ let invoice_payer =
+ InvoicePayer::new(&payer, router, &scorer, &logger, event_handler, RetryAttempts(2));
+
+ let payment_id = invoice_payer.pay_invoice(&invoice).unwrap();
+ let event = Event::PaymentPathSuccessful {
+ payment_id, payment_hash, path: route.paths[0].clone()
+ };
+ invoice_payer.handle_event(&event);
+ let event = Event::PaymentPathSuccessful {
+ payment_id, payment_hash, path: route.paths[1].clone()
+ };
+ invoice_payer.handle_event(&event);
+ }
+
struct TestRouter;
impl TestRouter {
}
}
- impl<S: routing::Score> Router<S> for TestRouter {
+ impl<S: Score> Router<S> for TestRouter {
fn find_route(
- &self,
- _payer: &PublicKey,
- params: &RouteParameters,
- _first_hops: Option<&[&ChannelDetails]>,
- _scorer: &S,
+ &self, _payer: &PublicKey, params: &RouteParameters, _payment_hash: &PaymentHash,
+ _first_hops: Option<&[&ChannelDetails]>, _scorer: &S
) -> Result<Route, LightningError> {
Ok(Route {
payee: Some(params.payee.clone()), ..Self::route_for_value(params.final_value_msat)
struct FailingRouter;
- impl<S: routing::Score> Router<S> for FailingRouter {
+ impl<S: Score> Router<S> for FailingRouter {
fn find_route(
- &self,
- _payer: &PublicKey,
- _params: &RouteParameters,
- _first_hops: Option<&[&ChannelDetails]>,
- _scorer: &S,
+ &self, _payer: &PublicKey, _params: &RouteParameters, _payment_hash: &PaymentHash,
+ _first_hops: Option<&[&ChannelDetails]>, _scorer: &S
) -> Result<Route, LightningError> {
Err(LightningError { err: String::new(), action: ErrorAction::IgnoreError })
}
}
struct TestScorer {
- expectations: VecDeque<u64>,
+ expectations: Option<VecDeque<PaymentPath>>,
+ }
+
+ #[derive(Debug)]
+ enum PaymentPath {
+ Failure { path: Vec<RouteHop>, short_channel_id: u64 },
+ Success { path: Vec<RouteHop> },
}
impl TestScorer {
fn new() -> Self {
Self {
- expectations: VecDeque::new(),
+ expectations: None,
}
}
- fn expect_channel_failure(mut self, short_channel_id: u64) -> Self {
- self.expectations.push_back(short_channel_id);
+ fn expect(mut self, expectation: PaymentPath) -> Self {
+ self.expectations.get_or_insert_with(|| VecDeque::new()).push_back(expectation);
self
}
}
- impl routing::Score for TestScorer {
+ #[cfg(c_bindings)]
+ impl lightning::util::ser::Writeable for TestScorer {
+ fn write<W: lightning::util::ser::Writer>(&self, _: &mut W) -> Result<(), std::io::Error> { unreachable!(); }
+ }
+
+ impl Score for TestScorer {
fn channel_penalty_msat(
- &self, _short_channel_id: u64, _source: &NodeId, _target: &NodeId
+ &self, _short_channel_id: u64, _send_amt: u64, _chan_amt: Option<u64>, _source: &NodeId, _target: &NodeId
) -> u64 { 0 }
- fn payment_path_failed(&mut self, _path: &[&RouteHop], short_channel_id: u64) {
- if let Some(expected_short_channel_id) = self.expectations.pop_front() {
- assert_eq!(short_channel_id, expected_short_channel_id);
+ fn payment_path_failed(&mut self, actual_path: &[&RouteHop], actual_short_channel_id: u64) {
+ if let Some(expectations) = &mut self.expectations {
+ match expectations.pop_front() {
+ Some(PaymentPath::Failure { path, short_channel_id }) => {
+ assert_eq!(actual_path, &path.iter().collect::<Vec<_>>()[..]);
+ assert_eq!(actual_short_channel_id, short_channel_id);
+ },
+ Some(PaymentPath::Success { path }) => {
+ panic!("Unexpected successful payment path: {:?}", path)
+ },
+ None => panic!("Unexpected payment_path_failed call: {:?}", actual_path),
+ }
+ }
+ }
+
+ fn payment_path_successful(&mut self, actual_path: &[&RouteHop]) {
+ if let Some(expectations) = &mut self.expectations {
+ match expectations.pop_front() {
+ Some(PaymentPath::Failure { path, .. }) => {
+ panic!("Unexpected payment path failure: {:?}", path)
+ },
+ Some(PaymentPath::Success { path }) => {
+ assert_eq!(actual_path, &path.iter().collect::<Vec<_>>()[..]);
+ },
+ None => panic!("Unexpected payment_path_successful call: {:?}", actual_path),
+ }
}
}
}
return;
}
- if !self.expectations.is_empty() {
- panic!("Unsatisfied channel failure expectations: {:?}", self.expectations);
+ if let Some(expectations) = &self.expectations {
+ if !expectations.is_empty() {
+ panic!("Unsatisfied scorer expectations: {:?}", expectations);
+ }
}
}
}
struct TestPayer {
expectations: core::cell::RefCell<VecDeque<Amount>>,
attempts: core::cell::RefCell<usize>,
- failing_on_attempt: Option<usize>,
+ failing_on_attempt: core::cell::RefCell<HashMap<usize, PaymentSendFailure>>,
}
#[derive(Clone, Debug, PartialEq, Eq)]
OnRetry(u64),
}
+ struct OnAttempt(usize);
+
impl TestPayer {
fn new() -> Self {
Self {
expectations: core::cell::RefCell::new(VecDeque::new()),
attempts: core::cell::RefCell::new(0),
- failing_on_attempt: None,
+ failing_on_attempt: core::cell::RefCell::new(HashMap::new()),
}
}
}
fn fails_on_attempt(self, attempt: usize) -> Self {
- Self {
- expectations: core::cell::RefCell::new(self.expectations.borrow().clone()),
- attempts: core::cell::RefCell::new(0),
- failing_on_attempt: Some(attempt),
- }
+ let failure = PaymentSendFailure::ParameterError(APIError::MonitorUpdateFailed);
+ self.fails_with(failure, OnAttempt(attempt))
+ }
+
+ fn fails_with_partial_failure(self, retry: RouteParameters, attempt: OnAttempt) -> Self {
+ self.fails_with(PaymentSendFailure::PartialFailure {
+ results: vec![],
+ failed_paths_retry: Some(retry),
+ payment_id: PaymentId([1; 32]),
+ }, attempt)
+ }
+
+ fn fails_with(self, failure: PaymentSendFailure, attempt: OnAttempt) -> Self {
+ self.failing_on_attempt.borrow_mut().insert(attempt.0, failure);
+ self
}
fn check_attempts(&self) -> Result<PaymentId, PaymentSendFailure> {
let mut attempts = self.attempts.borrow_mut();
*attempts += 1;
- match self.failing_on_attempt {
+
+ match self.failing_on_attempt.borrow_mut().remove(&*attempts) {
+ Some(failure) => Err(failure),
None => Ok(PaymentId([1; 32])),
- Some(attempt) if attempt != *attempts => Ok(PaymentId([1; 32])),
- Some(_) => Err(PaymentSendFailure::ParameterError(APIError::MonitorUpdateFailed)),
}
}
let expected_value_msats = self.expectations.borrow_mut().pop_front();
if let Some(expected_value_msats) = expected_value_msats {
assert_eq!(actual_value_msats, expected_value_msats);
+ } else {
+ panic!("Unexpected amount: {:?}", actual_value_msats);
}
}
}
// *** Full Featured Functional Tests with a Real ChannelManager ***
struct ManualRouter(RefCell<VecDeque<Result<Route, LightningError>>>);
- impl<S: routing::Score> Router<S> for ManualRouter {
- fn find_route(&self, _payer: &PublicKey, _params: &RouteParameters, _first_hops: Option<&[&ChannelDetails]>, _scorer: &S)
- -> Result<Route, LightningError> {
+ impl<S: Score> Router<S> for ManualRouter {
+ fn find_route(
+ &self, _payer: &PublicKey, _params: &RouteParameters, _payment_hash: &PaymentHash,
+ _first_hops: Option<&[&ChannelDetails]>, _scorer: &S
+ ) -> Result<Route, LightningError> {
self.0.borrow_mut().pop_front().unwrap()
}
}
projects / rust-lightning / blobdiff