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 //! A module for paying Lightning invoices.
12 //! Defines an [`InvoicePayer`] utility for paying invoices, parameterized by [`Payer`] and
13 //! [`Router`] traits. Implementations of [`Payer`] provide the payer's node id, channels, and means
14 //! to send a payment over a [`Route`]. Implementations of [`Router`] find a [`Route`] between payer
15 //! and payee using information provided by the payer and from the payee's [`Invoice`].
17 //! [`InvoicePayer`] is capable of retrying failed payments. It accomplishes this by implementing
18 //! [`EventHandler`] which decorates a user-provided handler. It will intercept any
19 //! [`Event::PaymentPathFailed`] events and retry the failed paths for a fixed number of total
20 //! attempts or until retry is no longer possible. In such a situation, [`InvoicePayer`] will pass
21 //! along the events to the user-provided handler.
26 //! # extern crate lightning;
27 //! # extern crate lightning_invoice;
28 //! # extern crate secp256k1;
30 //! # use lightning::ln::{PaymentHash, PaymentSecret};
31 //! # use lightning::ln::channelmanager::{ChannelDetails, PaymentId, PaymentSendFailure};
32 //! # use lightning::ln::msgs::LightningError;
33 //! # use lightning::routing;
34 //! # use lightning::routing::network_graph::NodeId;
35 //! # use lightning::routing::router::{Route, RouteHop, RouteParameters};
36 //! # use lightning::util::events::{Event, EventHandler, EventsProvider};
37 //! # use lightning::util::logger::{Logger, Record};
38 //! # use lightning_invoice::Invoice;
39 //! # use lightning_invoice::payment::{InvoicePayer, Payer, RetryAttempts, Router};
40 //! # use secp256k1::key::PublicKey;
41 //! # use std::cell::RefCell;
42 //! # use std::ops::Deref;
44 //! # struct FakeEventProvider {}
45 //! # impl EventsProvider for FakeEventProvider {
46 //! # fn process_pending_events<H: Deref>(&self, handler: H) where H::Target: EventHandler {}
49 //! # struct FakePayer {}
50 //! # impl Payer for FakePayer {
51 //! # fn node_id(&self) -> PublicKey { unimplemented!() }
52 //! # fn first_hops(&self) -> Vec<ChannelDetails> { unimplemented!() }
53 //! # fn send_payment(
54 //! # &self, route: &Route, payment_hash: PaymentHash, payment_secret: &Option<PaymentSecret>
55 //! # ) -> Result<PaymentId, PaymentSendFailure> { unimplemented!() }
56 //! # fn retry_payment(
57 //! # &self, route: &Route, payment_id: PaymentId
58 //! # ) -> Result<(), PaymentSendFailure> { unimplemented!() }
61 //! # struct FakeRouter {};
62 //! # impl<S: routing::Score> Router<S> for FakeRouter {
64 //! # &self, payer: &PublicKey, params: &RouteParameters,
65 //! # first_hops: Option<&[&ChannelDetails]>, scorer: &S
66 //! # ) -> Result<Route, LightningError> { unimplemented!() }
69 //! # struct FakeScorer {};
70 //! # impl routing::Score for FakeScorer {
71 //! # fn channel_penalty_msat(
72 //! # &self, _short_channel_id: u64, _source: &NodeId, _target: &NodeId
74 //! # fn payment_path_failed(&mut self, _path: &Vec<RouteHop>, _short_channel_id: u64) {}
77 //! # struct FakeLogger {};
78 //! # impl Logger for FakeLogger {
79 //! # fn log(&self, record: &Record) { unimplemented!() }
83 //! let event_handler = |event: &Event| {
85 //! Event::PaymentPathFailed { .. } => println!("payment failed after retries"),
86 //! Event::PaymentSent { .. } => println!("payment successful"),
90 //! # let payer = FakePayer {};
91 //! # let router = FakeRouter {};
92 //! # let scorer = RefCell::new(FakeScorer {});
93 //! # let logger = FakeLogger {};
94 //! let invoice_payer = InvoicePayer::new(&payer, router, &scorer, &logger, event_handler, RetryAttempts(2));
96 //! let invoice = "...";
97 //! let invoice = invoice.parse::<Invoice>().unwrap();
98 //! invoice_payer.pay_invoice(&invoice).unwrap();
100 //! # let event_provider = FakeEventProvider {};
102 //! event_provider.process_pending_events(&invoice_payer);
109 //! The [`Route`] is computed before each payment attempt. Any updates affecting path finding such
110 //! as updates to the network graph or changes to channel scores should be applied prior to
111 //! retries, typically by way of composing [`EventHandler`]s accordingly.
115 use bitcoin_hashes::Hash;
117 use lightning::ln::{PaymentHash, PaymentSecret};
118 use lightning::ln::channelmanager::{ChannelDetails, PaymentId, PaymentSendFailure};
119 use lightning::ln::msgs::LightningError;
120 use lightning::routing;
121 use lightning::routing::{LockableScore, Score};
122 use lightning::routing::router::{Payee, Route, RouteParameters};
123 use lightning::util::events::{Event, EventHandler};
124 use lightning::util::logger::Logger;
126 use secp256k1::key::PublicKey;
128 use std::collections::hash_map::{self, HashMap};
130 use std::sync::Mutex;
131 use std::time::{Duration, SystemTime};
133 /// A utility for paying [`Invoice]`s.
134 pub struct InvoicePayer<P: Deref, R, S: Deref, L: Deref, E>
137 R: for <'a> Router<<<S as Deref>::Target as routing::LockableScore<'a>>::Locked>,
138 S::Target: for <'a> routing::LockableScore<'a>,
147 payment_cache: Mutex<HashMap<PaymentHash, usize>>,
148 retry_attempts: RetryAttempts,
151 /// A trait defining behavior of an [`Invoice`] payer.
153 /// Returns the payer's node id.
154 fn node_id(&self) -> PublicKey;
156 /// Returns the payer's channels.
157 fn first_hops(&self) -> Vec<ChannelDetails>;
159 /// Sends a payment over the Lightning Network using the given [`Route`].
161 &self, route: &Route, payment_hash: PaymentHash, payment_secret: &Option<PaymentSecret>
162 ) -> Result<PaymentId, PaymentSendFailure>;
164 /// Retries a failed payment path for the [`PaymentId`] using the given [`Route`].
165 fn retry_payment(&self, route: &Route, payment_id: PaymentId) -> Result<(), PaymentSendFailure>;
168 /// A trait defining behavior for routing an [`Invoice`] payment.
169 pub trait Router<S: routing::Score> {
170 /// Finds a [`Route`] between `payer` and `payee` for a payment with the given values.
172 &self, payer: &PublicKey, params: &RouteParameters, first_hops: Option<&[&ChannelDetails]>,
174 ) -> Result<Route, LightningError>;
177 /// Number of attempts to retry payment path failures for an [`Invoice`].
179 /// Note that this is the number of *path* failures, not full payment retries. For multi-path
180 /// payments, if this is less than the total number of paths, we will never even retry all of the
182 #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
183 pub struct RetryAttempts(pub usize);
185 /// An error that may occur when making a payment.
186 #[derive(Clone, Debug)]
187 pub enum PaymentError {
188 /// An error resulting from the provided [`Invoice`] or payment hash.
189 Invoice(&'static str),
190 /// An error occurring when finding a route.
191 Routing(LightningError),
192 /// An error occurring when sending a payment.
193 Sending(PaymentSendFailure),
196 impl<P: Deref, R, S: Deref, L: Deref, E> InvoicePayer<P, R, S, L, E>
199 R: for <'a> Router<<<S as Deref>::Target as routing::LockableScore<'a>>::Locked>,
200 S::Target: for <'a> routing::LockableScore<'a>,
204 /// Creates an invoice payer that retries failed payment paths.
206 /// Will forward any [`Event::PaymentPathFailed`] events to the decorated `event_handler` once
207 /// `retry_attempts` has been exceeded for a given [`Invoice`].
209 payer: P, router: R, scorer: S, logger: L, event_handler: E, retry_attempts: RetryAttempts
217 payment_cache: Mutex::new(HashMap::new()),
222 /// Pays the given [`Invoice`], caching it for later use in case a retry is needed.
224 /// You should ensure that the `invoice.payment_hash()` is unique and the same payment_hash has
225 /// never been paid before. Because [`InvoicePayer`] is stateless no effort is made to do so
227 pub fn pay_invoice(&self, invoice: &Invoice) -> Result<PaymentId, PaymentError> {
228 if invoice.amount_milli_satoshis().is_none() {
229 Err(PaymentError::Invoice("amount missing"))
231 self.pay_invoice_internal(invoice, None)
235 /// Pays the given zero-value [`Invoice`] using the given amount, caching it for later use in
236 /// case a retry is needed.
238 /// You should ensure that the `invoice.payment_hash()` is unique and the same payment_hash has
239 /// never been paid before. Because [`InvoicePayer`] is stateless no effort is made to do so
241 pub fn pay_zero_value_invoice(
242 &self, invoice: &Invoice, amount_msats: u64
243 ) -> Result<PaymentId, PaymentError> {
244 if invoice.amount_milli_satoshis().is_some() {
245 Err(PaymentError::Invoice("amount unexpected"))
247 self.pay_invoice_internal(invoice, Some(amount_msats))
251 fn pay_invoice_internal(
252 &self, invoice: &Invoice, amount_msats: Option<u64>
253 ) -> Result<PaymentId, PaymentError> {
254 debug_assert!(invoice.amount_milli_satoshis().is_some() ^ amount_msats.is_some());
255 let payment_hash = PaymentHash(invoice.payment_hash().clone().into_inner());
256 let mut payment_cache = self.payment_cache.lock().unwrap();
257 match payment_cache.entry(payment_hash) {
258 hash_map::Entry::Vacant(entry) => {
259 let payer = self.payer.node_id();
260 let mut payee = Payee::new(invoice.recover_payee_pub_key())
261 .with_expiry_time(expiry_time_from_unix_epoch(&invoice).as_secs())
262 .with_route_hints(invoice.route_hints());
263 if let Some(features) = invoice.features() {
264 payee = payee.with_features(features.clone());
266 let params = RouteParameters {
268 final_value_msat: invoice.amount_milli_satoshis().or(amount_msats).unwrap(),
269 final_cltv_expiry_delta: invoice.min_final_cltv_expiry() as u32,
271 let first_hops = self.payer.first_hops();
272 let route = self.router.find_route(
275 Some(&first_hops.iter().collect::<Vec<_>>()),
277 ).map_err(|e| PaymentError::Routing(e))?;
279 let payment_hash = PaymentHash(invoice.payment_hash().clone().into_inner());
280 let payment_secret = Some(invoice.payment_secret().clone());
281 let payment_id = self.payer.send_payment(&route, payment_hash, &payment_secret)
282 .map_err(|e| PaymentError::Sending(e))?;
286 hash_map::Entry::Occupied(_) => Err(PaymentError::Invoice("payment pending")),
291 &self, payment_id: PaymentId, params: &RouteParameters
292 ) -> Result<(), PaymentError> {
293 let payer = self.payer.node_id();
294 let first_hops = self.payer.first_hops();
295 let route = self.router.find_route(
296 &payer, ¶ms, Some(&first_hops.iter().collect::<Vec<_>>()),
298 ).map_err(|e| PaymentError::Routing(e))?;
299 self.payer.retry_payment(&route, payment_id).map_err(|e| PaymentError::Sending(e))
302 /// Removes the payment cached by the given payment hash.
304 /// Should be called once a payment has failed or succeeded if not using [`InvoicePayer`] as an
305 /// [`EventHandler`]. Otherwise, calling this method is unnecessary.
306 pub fn remove_cached_payment(&self, payment_hash: &PaymentHash) {
307 self.payment_cache.lock().unwrap().remove(payment_hash);
311 fn expiry_time_from_unix_epoch(invoice: &Invoice) -> Duration {
312 invoice.timestamp().duration_since(SystemTime::UNIX_EPOCH).unwrap() + invoice.expiry_time()
315 fn has_expired(params: &RouteParameters) -> bool {
316 let expiry_time = Duration::from_secs(params.payee.expiry_time.unwrap());
317 Invoice::is_expired_from_epoch(&SystemTime::UNIX_EPOCH, expiry_time)
320 impl<P: Deref, R, S: Deref, L: Deref, E> EventHandler for InvoicePayer<P, R, S, L, E>
323 R: for <'a> Router<<<S as Deref>::Target as routing::LockableScore<'a>>::Locked>,
324 S::Target: for <'a> routing::LockableScore<'a>,
328 fn handle_event(&self, event: &Event) {
330 Event::PaymentPathFailed {
331 payment_id, payment_hash, rejected_by_dest, path, short_channel_id, retry, ..
333 if let Some(short_channel_id) = short_channel_id {
334 self.scorer.lock().payment_path_failed(path, *short_channel_id);
337 let mut payment_cache = self.payment_cache.lock().unwrap();
339 let entry = payment_cache.entry(*payment_hash);
341 hash_map::Entry::Occupied(_) => break entry,
342 hash_map::Entry::Vacant(entry) => entry.insert(0),
345 if let hash_map::Entry::Occupied(mut entry) = entry {
346 let max_payment_attempts = self.retry_attempts.0 + 1;
347 let attempts = entry.get_mut();
350 if *rejected_by_dest {
351 log_trace!(self.logger, "Payment {} rejected by destination; not retrying (attempts: {})", log_bytes!(payment_hash.0), attempts);
352 } else if payment_id.is_none() {
353 log_trace!(self.logger, "Payment {} has no id; not retrying (attempts: {})", log_bytes!(payment_hash.0), attempts);
354 } else if *attempts >= max_payment_attempts {
355 log_trace!(self.logger, "Payment {} exceeded maximum attempts; not retrying (attempts: {})", log_bytes!(payment_hash.0), attempts);
356 } else if retry.is_none() {
357 log_trace!(self.logger, "Payment {} missing retry params; not retrying (attempts: {})", log_bytes!(payment_hash.0), attempts);
358 } else if has_expired(retry.as_ref().unwrap()) {
359 log_trace!(self.logger, "Invoice expired for payment {}; not retrying (attempts: {})", log_bytes!(payment_hash.0), attempts);
360 } else if self.retry_payment(*payment_id.as_ref().unwrap(), retry.as_ref().unwrap()).is_err() {
361 log_trace!(self.logger, "Error retrying payment {}; not retrying (attempts: {})", log_bytes!(payment_hash.0), attempts);
363 log_trace!(self.logger, "Payment {} failed; retrying (attempts: {})", log_bytes!(payment_hash.0), attempts);
367 // Either the payment was rejected, the maximum attempts were exceeded, or an
368 // error occurred when attempting to retry.
374 Event::PaymentSent { payment_hash, .. } => {
375 let mut payment_cache = self.payment_cache.lock().unwrap();
376 let attempts = payment_cache
377 .remove(payment_hash)
378 .map_or(1, |attempts| attempts + 1);
379 log_trace!(self.logger, "Payment {} succeeded (attempts: {})", log_bytes!(payment_hash.0), attempts);
384 // Delegate to the decorated event handler unless the payment is retried.
385 self.event_handler.handle_event(event)
392 use crate::{DEFAULT_EXPIRY_TIME, InvoiceBuilder, Currency};
393 use bitcoin_hashes::sha256::Hash as Sha256;
394 use lightning::ln::PaymentPreimage;
395 use lightning::ln::features::{ChannelFeatures, NodeFeatures};
396 use lightning::ln::msgs::{ErrorAction, LightningError};
397 use lightning::routing::network_graph::NodeId;
398 use lightning::routing::router::{Payee, Route, RouteHop};
399 use lightning::util::test_utils::TestLogger;
400 use lightning::util::errors::APIError;
401 use lightning::util::events::Event;
402 use secp256k1::{SecretKey, PublicKey, Secp256k1};
403 use std::cell::RefCell;
404 use std::time::{SystemTime, Duration};
406 fn invoice(payment_preimage: PaymentPreimage) -> Invoice {
407 let payment_hash = Sha256::hash(&payment_preimage.0);
408 let private_key = SecretKey::from_slice(&[42; 32]).unwrap();
409 InvoiceBuilder::new(Currency::Bitcoin)
410 .description("test".into())
411 .payment_hash(payment_hash)
412 .payment_secret(PaymentSecret([0; 32]))
414 .min_final_cltv_expiry(144)
415 .amount_milli_satoshis(128)
416 .build_signed(|hash| {
417 Secp256k1::new().sign_recoverable(hash, &private_key)
422 fn zero_value_invoice(payment_preimage: PaymentPreimage) -> Invoice {
423 let payment_hash = Sha256::hash(&payment_preimage.0);
424 let private_key = SecretKey::from_slice(&[42; 32]).unwrap();
425 InvoiceBuilder::new(Currency::Bitcoin)
426 .description("test".into())
427 .payment_hash(payment_hash)
428 .payment_secret(PaymentSecret([0; 32]))
430 .min_final_cltv_expiry(144)
431 .build_signed(|hash| {
432 Secp256k1::new().sign_recoverable(hash, &private_key)
437 fn expired_invoice(payment_preimage: PaymentPreimage) -> Invoice {
438 let payment_hash = Sha256::hash(&payment_preimage.0);
439 let private_key = SecretKey::from_slice(&[42; 32]).unwrap();
440 let timestamp = SystemTime::now()
441 .checked_sub(Duration::from_secs(DEFAULT_EXPIRY_TIME * 2))
443 InvoiceBuilder::new(Currency::Bitcoin)
444 .description("test".into())
445 .payment_hash(payment_hash)
446 .payment_secret(PaymentSecret([0; 32]))
447 .timestamp(timestamp)
448 .min_final_cltv_expiry(144)
449 .amount_milli_satoshis(128)
450 .build_signed(|hash| {
451 Secp256k1::new().sign_recoverable(hash, &private_key)
457 fn pays_invoice_on_first_attempt() {
458 let event_handled = core::cell::RefCell::new(false);
459 let event_handler = |_: &_| { *event_handled.borrow_mut() = true; };
461 let payment_preimage = PaymentPreimage([1; 32]);
462 let invoice = invoice(payment_preimage);
463 let payment_hash = PaymentHash(invoice.payment_hash().clone().into_inner());
465 let payer = TestPayer::new();
466 let router = TestRouter {};
467 let scorer = RefCell::new(TestScorer::new());
468 let logger = TestLogger::new();
470 InvoicePayer::new(&payer, router, &scorer, &logger, event_handler, RetryAttempts(0));
472 let payment_id = Some(invoice_payer.pay_invoice(&invoice).unwrap());
473 assert_eq!(*payer.attempts.borrow(), 1);
475 invoice_payer.handle_event(&Event::PaymentSent {
476 payment_id, payment_preimage, payment_hash, fee_paid_msat: None
478 assert_eq!(*event_handled.borrow(), true);
479 assert_eq!(*payer.attempts.borrow(), 1);
483 fn pays_invoice_on_retry() {
484 let event_handled = core::cell::RefCell::new(false);
485 let event_handler = |_: &_| { *event_handled.borrow_mut() = true; };
487 let payment_preimage = PaymentPreimage([1; 32]);
488 let invoice = invoice(payment_preimage);
489 let payment_hash = PaymentHash(invoice.payment_hash().clone().into_inner());
490 let final_value_msat = invoice.amount_milli_satoshis().unwrap();
492 let payer = TestPayer::new()
493 .expect_value_msat(final_value_msat)
494 .expect_value_msat(final_value_msat / 2);
495 let router = TestRouter {};
496 let scorer = RefCell::new(TestScorer::new());
497 let logger = TestLogger::new();
499 InvoicePayer::new(&payer, router, &scorer, &logger, event_handler, RetryAttempts(2));
501 let payment_id = Some(invoice_payer.pay_invoice(&invoice).unwrap());
502 assert_eq!(*payer.attempts.borrow(), 1);
504 let event = Event::PaymentPathFailed {
507 network_update: None,
508 rejected_by_dest: false,
509 all_paths_failed: false,
510 path: TestRouter::path_for_value(final_value_msat),
511 short_channel_id: None,
512 retry: Some(TestRouter::retry_for_invoice(&invoice)),
514 invoice_payer.handle_event(&event);
515 assert_eq!(*event_handled.borrow(), false);
516 assert_eq!(*payer.attempts.borrow(), 2);
518 invoice_payer.handle_event(&Event::PaymentSent {
519 payment_id, payment_preimage, payment_hash, fee_paid_msat: None
521 assert_eq!(*event_handled.borrow(), true);
522 assert_eq!(*payer.attempts.borrow(), 2);
526 fn retries_payment_path_for_unknown_payment() {
527 let event_handled = core::cell::RefCell::new(false);
528 let event_handler = |_: &_| { *event_handled.borrow_mut() = true; };
530 let payment_preimage = PaymentPreimage([1; 32]);
531 let invoice = invoice(payment_preimage);
532 let payment_hash = PaymentHash(invoice.payment_hash().clone().into_inner());
533 let final_value_msat = invoice.amount_milli_satoshis().unwrap();
535 let payer = TestPayer::new();
536 let router = TestRouter {};
537 let scorer = RefCell::new(TestScorer::new());
538 let logger = TestLogger::new();
540 InvoicePayer::new(&payer, router, &scorer, &logger, event_handler, RetryAttempts(2));
542 let payment_id = Some(PaymentId([1; 32]));
543 let event = Event::PaymentPathFailed {
546 network_update: None,
547 rejected_by_dest: false,
548 all_paths_failed: false,
549 path: TestRouter::path_for_value(final_value_msat),
550 short_channel_id: None,
551 retry: Some(TestRouter::retry_for_invoice(&invoice)),
553 invoice_payer.handle_event(&event);
554 assert_eq!(*event_handled.borrow(), false);
555 assert_eq!(*payer.attempts.borrow(), 1);
557 invoice_payer.handle_event(&event);
558 assert_eq!(*event_handled.borrow(), false);
559 assert_eq!(*payer.attempts.borrow(), 2);
561 invoice_payer.handle_event(&Event::PaymentSent {
562 payment_id, payment_preimage, payment_hash, fee_paid_msat: None
564 assert_eq!(*event_handled.borrow(), true);
565 assert_eq!(*payer.attempts.borrow(), 2);
569 fn fails_paying_invoice_after_max_retries() {
570 let event_handled = core::cell::RefCell::new(false);
571 let event_handler = |_: &_| { *event_handled.borrow_mut() = true; };
573 let payment_preimage = PaymentPreimage([1; 32]);
574 let invoice = invoice(payment_preimage);
575 let final_value_msat = invoice.amount_milli_satoshis().unwrap();
577 let payer = TestPayer::new()
578 .expect_value_msat(final_value_msat)
579 .expect_value_msat(final_value_msat / 2)
580 .expect_value_msat(final_value_msat / 2);
581 let router = TestRouter {};
582 let scorer = RefCell::new(TestScorer::new());
583 let logger = TestLogger::new();
585 InvoicePayer::new(&payer, router, &scorer, &logger, event_handler, RetryAttempts(2));
587 let payment_id = Some(invoice_payer.pay_invoice(&invoice).unwrap());
588 assert_eq!(*payer.attempts.borrow(), 1);
590 let event = Event::PaymentPathFailed {
592 payment_hash: PaymentHash(invoice.payment_hash().clone().into_inner()),
593 network_update: None,
594 rejected_by_dest: false,
595 all_paths_failed: true,
596 path: TestRouter::path_for_value(final_value_msat),
597 short_channel_id: None,
598 retry: Some(TestRouter::retry_for_invoice(&invoice)),
600 invoice_payer.handle_event(&event);
601 assert_eq!(*event_handled.borrow(), false);
602 assert_eq!(*payer.attempts.borrow(), 2);
604 let event = Event::PaymentPathFailed {
606 payment_hash: PaymentHash(invoice.payment_hash().clone().into_inner()),
607 network_update: None,
608 rejected_by_dest: false,
609 all_paths_failed: false,
610 path: TestRouter::path_for_value(final_value_msat / 2),
611 short_channel_id: None,
612 retry: Some(RouteParameters {
613 final_value_msat: final_value_msat / 2, ..TestRouter::retry_for_invoice(&invoice)
616 invoice_payer.handle_event(&event);
617 assert_eq!(*event_handled.borrow(), false);
618 assert_eq!(*payer.attempts.borrow(), 3);
620 invoice_payer.handle_event(&event);
621 assert_eq!(*event_handled.borrow(), true);
622 assert_eq!(*payer.attempts.borrow(), 3);
626 fn fails_paying_invoice_with_missing_retry_params() {
627 let event_handled = core::cell::RefCell::new(false);
628 let event_handler = |_: &_| { *event_handled.borrow_mut() = true; };
630 let payer = TestPayer::new();
631 let router = TestRouter {};
632 let scorer = RefCell::new(TestScorer::new());
633 let logger = TestLogger::new();
635 InvoicePayer::new(&payer, router, &scorer, &logger, event_handler, RetryAttempts(2));
637 let payment_preimage = PaymentPreimage([1; 32]);
638 let invoice = invoice(payment_preimage);
639 let payment_id = Some(invoice_payer.pay_invoice(&invoice).unwrap());
640 assert_eq!(*payer.attempts.borrow(), 1);
642 let event = Event::PaymentPathFailed {
644 payment_hash: PaymentHash(invoice.payment_hash().clone().into_inner()),
645 network_update: None,
646 rejected_by_dest: false,
647 all_paths_failed: false,
649 short_channel_id: None,
652 invoice_payer.handle_event(&event);
653 assert_eq!(*event_handled.borrow(), true);
654 assert_eq!(*payer.attempts.borrow(), 1);
658 fn fails_paying_invoice_after_expiration() {
659 let event_handled = core::cell::RefCell::new(false);
660 let event_handler = |_: &_| { *event_handled.borrow_mut() = true; };
662 let payer = TestPayer::new();
663 let router = TestRouter {};
664 let scorer = RefCell::new(TestScorer::new());
665 let logger = TestLogger::new();
667 InvoicePayer::new(&payer, router, &scorer, &logger, event_handler, RetryAttempts(2));
669 let payment_preimage = PaymentPreimage([1; 32]);
670 let invoice = expired_invoice(payment_preimage);
671 let payment_id = Some(invoice_payer.pay_invoice(&invoice).unwrap());
672 assert_eq!(*payer.attempts.borrow(), 1);
674 let event = Event::PaymentPathFailed {
676 payment_hash: PaymentHash(invoice.payment_hash().clone().into_inner()),
677 network_update: None,
678 rejected_by_dest: false,
679 all_paths_failed: false,
681 short_channel_id: None,
682 retry: Some(TestRouter::retry_for_invoice(&invoice)),
684 invoice_payer.handle_event(&event);
685 assert_eq!(*event_handled.borrow(), true);
686 assert_eq!(*payer.attempts.borrow(), 1);
690 fn fails_paying_invoice_after_retry_error() {
691 let event_handled = core::cell::RefCell::new(false);
692 let event_handler = |_: &_| { *event_handled.borrow_mut() = true; };
694 let payment_preimage = PaymentPreimage([1; 32]);
695 let invoice = invoice(payment_preimage);
696 let final_value_msat = invoice.amount_milli_satoshis().unwrap();
698 let payer = TestPayer::new()
700 .expect_value_msat(final_value_msat);
701 let router = TestRouter {};
702 let scorer = RefCell::new(TestScorer::new());
703 let logger = TestLogger::new();
705 InvoicePayer::new(&payer, router, &scorer, &logger, event_handler, RetryAttempts(2));
707 let payment_id = Some(invoice_payer.pay_invoice(&invoice).unwrap());
708 assert_eq!(*payer.attempts.borrow(), 1);
710 let event = Event::PaymentPathFailed {
712 payment_hash: PaymentHash(invoice.payment_hash().clone().into_inner()),
713 network_update: None,
714 rejected_by_dest: false,
715 all_paths_failed: false,
716 path: TestRouter::path_for_value(final_value_msat / 2),
717 short_channel_id: None,
718 retry: Some(TestRouter::retry_for_invoice(&invoice)),
720 invoice_payer.handle_event(&event);
721 assert_eq!(*event_handled.borrow(), true);
722 assert_eq!(*payer.attempts.borrow(), 2);
726 fn fails_paying_invoice_after_rejected_by_payee() {
727 let event_handled = core::cell::RefCell::new(false);
728 let event_handler = |_: &_| { *event_handled.borrow_mut() = true; };
730 let payer = TestPayer::new();
731 let router = TestRouter {};
732 let scorer = RefCell::new(TestScorer::new());
733 let logger = TestLogger::new();
735 InvoicePayer::new(&payer, router, &scorer, &logger, event_handler, RetryAttempts(2));
737 let payment_preimage = PaymentPreimage([1; 32]);
738 let invoice = invoice(payment_preimage);
739 let payment_id = Some(invoice_payer.pay_invoice(&invoice).unwrap());
740 assert_eq!(*payer.attempts.borrow(), 1);
742 let event = Event::PaymentPathFailed {
744 payment_hash: PaymentHash(invoice.payment_hash().clone().into_inner()),
745 network_update: None,
746 rejected_by_dest: true,
747 all_paths_failed: false,
749 short_channel_id: None,
750 retry: Some(TestRouter::retry_for_invoice(&invoice)),
752 invoice_payer.handle_event(&event);
753 assert_eq!(*event_handled.borrow(), true);
754 assert_eq!(*payer.attempts.borrow(), 1);
758 fn fails_repaying_invoice_with_pending_payment() {
759 let event_handled = core::cell::RefCell::new(false);
760 let event_handler = |_: &_| { *event_handled.borrow_mut() = true; };
762 let payer = TestPayer::new();
763 let router = TestRouter {};
764 let scorer = RefCell::new(TestScorer::new());
765 let logger = TestLogger::new();
767 InvoicePayer::new(&payer, router, &scorer, &logger, event_handler, RetryAttempts(0));
769 let payment_preimage = PaymentPreimage([1; 32]);
770 let invoice = invoice(payment_preimage);
771 let payment_id = Some(invoice_payer.pay_invoice(&invoice).unwrap());
773 // Cannot repay an invoice pending payment.
774 match invoice_payer.pay_invoice(&invoice) {
775 Err(PaymentError::Invoice("payment pending")) => {},
776 Err(_) => panic!("unexpected error"),
777 Ok(_) => panic!("expected invoice error"),
780 // Can repay an invoice once cleared from cache.
781 let payment_hash = PaymentHash(invoice.payment_hash().clone().into_inner());
782 invoice_payer.remove_cached_payment(&payment_hash);
783 assert!(invoice_payer.pay_invoice(&invoice).is_ok());
785 // Cannot retry paying an invoice if cleared from cache.
786 invoice_payer.remove_cached_payment(&payment_hash);
787 let event = Event::PaymentPathFailed {
790 network_update: None,
791 rejected_by_dest: false,
792 all_paths_failed: false,
794 short_channel_id: None,
795 retry: Some(TestRouter::retry_for_invoice(&invoice)),
797 invoice_payer.handle_event(&event);
798 assert_eq!(*event_handled.borrow(), true);
802 fn fails_paying_invoice_with_routing_errors() {
803 let payer = TestPayer::new();
804 let router = FailingRouter {};
805 let scorer = RefCell::new(TestScorer::new());
806 let logger = TestLogger::new();
808 InvoicePayer::new(&payer, router, &scorer, &logger, |_: &_| {}, RetryAttempts(0));
810 let payment_preimage = PaymentPreimage([1; 32]);
811 let invoice = invoice(payment_preimage);
812 match invoice_payer.pay_invoice(&invoice) {
813 Err(PaymentError::Routing(_)) => {},
814 Err(_) => panic!("unexpected error"),
815 Ok(_) => panic!("expected routing error"),
820 fn fails_paying_invoice_with_sending_errors() {
821 let payer = TestPayer::new().fails_on_attempt(1);
822 let router = TestRouter {};
823 let scorer = RefCell::new(TestScorer::new());
824 let logger = TestLogger::new();
826 InvoicePayer::new(&payer, router, &scorer, &logger, |_: &_| {}, RetryAttempts(0));
828 let payment_preimage = PaymentPreimage([1; 32]);
829 let invoice = invoice(payment_preimage);
830 match invoice_payer.pay_invoice(&invoice) {
831 Err(PaymentError::Sending(_)) => {},
832 Err(_) => panic!("unexpected error"),
833 Ok(_) => panic!("expected sending error"),
838 fn pays_zero_value_invoice_using_amount() {
839 let event_handled = core::cell::RefCell::new(false);
840 let event_handler = |_: &_| { *event_handled.borrow_mut() = true; };
842 let payment_preimage = PaymentPreimage([1; 32]);
843 let invoice = zero_value_invoice(payment_preimage);
844 let payment_hash = PaymentHash(invoice.payment_hash().clone().into_inner());
845 let final_value_msat = 100;
847 let payer = TestPayer::new().expect_value_msat(final_value_msat);
848 let router = TestRouter {};
849 let scorer = RefCell::new(TestScorer::new());
850 let logger = TestLogger::new();
852 InvoicePayer::new(&payer, router, &scorer, &logger, event_handler, RetryAttempts(0));
855 Some(invoice_payer.pay_zero_value_invoice(&invoice, final_value_msat).unwrap());
856 assert_eq!(*payer.attempts.borrow(), 1);
858 invoice_payer.handle_event(&Event::PaymentSent {
859 payment_id, payment_preimage, payment_hash, fee_paid_msat: None
861 assert_eq!(*event_handled.borrow(), true);
862 assert_eq!(*payer.attempts.borrow(), 1);
866 fn fails_paying_zero_value_invoice_with_amount() {
867 let event_handled = core::cell::RefCell::new(false);
868 let event_handler = |_: &_| { *event_handled.borrow_mut() = true; };
870 let payer = TestPayer::new();
871 let router = TestRouter {};
872 let scorer = RefCell::new(TestScorer::new());
873 let logger = TestLogger::new();
875 InvoicePayer::new(&payer, router, &scorer, &logger, event_handler, RetryAttempts(0));
877 let payment_preimage = PaymentPreimage([1; 32]);
878 let invoice = invoice(payment_preimage);
880 // Cannot repay an invoice pending payment.
881 match invoice_payer.pay_zero_value_invoice(&invoice, 100) {
882 Err(PaymentError::Invoice("amount unexpected")) => {},
883 Err(_) => panic!("unexpected error"),
884 Ok(_) => panic!("expected invoice error"),
889 fn scores_failed_channel() {
890 let event_handled = core::cell::RefCell::new(false);
891 let event_handler = |_: &_| { *event_handled.borrow_mut() = true; };
893 let payment_preimage = PaymentPreimage([1; 32]);
894 let invoice = invoice(payment_preimage);
895 let payment_hash = PaymentHash(invoice.payment_hash().clone().into_inner());
896 let final_value_msat = invoice.amount_milli_satoshis().unwrap();
897 let path = TestRouter::path_for_value(final_value_msat);
898 let short_channel_id = Some(path[0].short_channel_id);
900 // Expect that scorer is given short_channel_id upon handling the event.
901 let payer = TestPayer::new();
902 let router = TestRouter {};
903 let scorer = RefCell::new(TestScorer::new().expect_channel_failure(short_channel_id.unwrap()));
904 let logger = TestLogger::new();
906 InvoicePayer::new(&payer, router, &scorer, &logger, event_handler, RetryAttempts(2));
908 let payment_id = Some(invoice_payer.pay_invoice(&invoice).unwrap());
909 let event = Event::PaymentPathFailed {
912 network_update: None,
913 rejected_by_dest: false,
914 all_paths_failed: false,
917 retry: Some(TestRouter::retry_for_invoice(&invoice)),
919 invoice_payer.handle_event(&event);
925 fn route_for_value(final_value_msat: u64) -> Route {
929 pubkey: PublicKey::from_slice(&hex::decode("02eec7245d6b7d2ccb30380bfbe2a3648cd7a942653f5aa340edcea1f283686619").unwrap()[..]).unwrap(),
930 channel_features: ChannelFeatures::empty(),
931 node_features: NodeFeatures::empty(),
932 short_channel_id: 0, fee_msat: final_value_msat / 2, cltv_expiry_delta: 144
935 pubkey: PublicKey::from_slice(&hex::decode("0324653eac434488002cc06bbfb7f10fe18991e35f9fe4302dbea6d2353dc0ab1c").unwrap()[..]).unwrap(),
936 channel_features: ChannelFeatures::empty(),
937 node_features: NodeFeatures::empty(),
938 short_channel_id: 1, fee_msat: final_value_msat / 2, cltv_expiry_delta: 144
945 fn path_for_value(final_value_msat: u64) -> Vec<RouteHop> {
946 TestRouter::route_for_value(final_value_msat).paths[0].clone()
949 fn retry_for_invoice(invoice: &Invoice) -> RouteParameters {
950 let mut payee = Payee::new(invoice.recover_payee_pub_key())
951 .with_expiry_time(expiry_time_from_unix_epoch(invoice).as_secs())
952 .with_route_hints(invoice.route_hints());
953 if let Some(features) = invoice.features() {
954 payee = payee.with_features(features.clone());
956 let final_value_msat = invoice.amount_milli_satoshis().unwrap() / 2;
960 final_cltv_expiry_delta: invoice.min_final_cltv_expiry() as u32,
965 impl<S: routing::Score> Router<S> for TestRouter {
969 params: &RouteParameters,
970 _first_hops: Option<&[&ChannelDetails]>,
972 ) -> Result<Route, LightningError> {
974 payee: Some(params.payee.clone()), ..Self::route_for_value(params.final_value_msat)
979 struct FailingRouter;
981 impl<S: routing::Score> Router<S> for FailingRouter {
985 _params: &RouteParameters,
986 _first_hops: Option<&[&ChannelDetails]>,
988 ) -> Result<Route, LightningError> {
989 Err(LightningError { err: String::new(), action: ErrorAction::IgnoreError })
994 expectations: std::collections::VecDeque<u64>,
1000 expectations: std::collections::VecDeque::new(),
1004 fn expect_channel_failure(mut self, short_channel_id: u64) -> Self {
1005 self.expectations.push_back(short_channel_id);
1010 impl routing::Score for TestScorer {
1011 fn channel_penalty_msat(
1012 &self, _short_channel_id: u64, _source: &NodeId, _target: &NodeId
1015 fn payment_path_failed(&mut self, _path: &Vec<RouteHop>, short_channel_id: u64) {
1016 if let Some(expected_short_channel_id) = self.expectations.pop_front() {
1017 assert_eq!(short_channel_id, expected_short_channel_id);
1022 impl Drop for TestScorer {
1023 fn drop(&mut self) {
1024 if std::thread::panicking() {
1028 if !self.expectations.is_empty() {
1029 panic!("Unsatisfied channel failure expectations: {:?}", self.expectations);
1035 expectations: core::cell::RefCell<std::collections::VecDeque<u64>>,
1036 attempts: core::cell::RefCell<usize>,
1037 failing_on_attempt: Option<usize>,
1043 expectations: core::cell::RefCell::new(std::collections::VecDeque::new()),
1044 attempts: core::cell::RefCell::new(0),
1045 failing_on_attempt: None,
1049 fn expect_value_msat(self, value_msat: u64) -> Self {
1050 self.expectations.borrow_mut().push_back(value_msat);
1054 fn fails_on_attempt(self, attempt: usize) -> Self {
1056 expectations: core::cell::RefCell::new(self.expectations.borrow().clone()),
1057 attempts: core::cell::RefCell::new(0),
1058 failing_on_attempt: Some(attempt),
1062 fn check_attempts(&self) -> bool {
1063 let mut attempts = self.attempts.borrow_mut();
1065 match self.failing_on_attempt {
1067 Some(attempt) if attempt != *attempts => true,
1072 fn check_value_msats(&self, route: &Route) {
1073 let expected_value_msats = self.expectations.borrow_mut().pop_front();
1074 if let Some(expected_value_msats) = expected_value_msats {
1075 let actual_value_msats = route.get_total_amount();
1076 assert_eq!(actual_value_msats, expected_value_msats);
1081 impl Drop for TestPayer {
1082 fn drop(&mut self) {
1083 if std::thread::panicking() {
1087 if !self.expectations.borrow().is_empty() {
1088 panic!("Unsatisfied payment expectations: {:?}", self.expectations.borrow());
1093 impl Payer for TestPayer {
1094 fn node_id(&self) -> PublicKey {
1095 let secp_ctx = Secp256k1::new();
1096 PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap())
1099 fn first_hops(&self) -> Vec<ChannelDetails> {
1106 _payment_hash: PaymentHash,
1107 _payment_secret: &Option<PaymentSecret>
1108 ) -> Result<PaymentId, PaymentSendFailure> {
1109 if self.check_attempts() {
1110 self.check_value_msats(route);
1111 Ok(PaymentId([1; 32]))
1113 Err(PaymentSendFailure::ParameterError(APIError::MonitorUpdateFailed))
1118 &self, route: &Route, _payment_id: PaymentId
1119 ) -> Result<(), PaymentSendFailure> {
1120 if self.check_attempts() {
1121 self.check_value_msats(route);
1124 Err(PaymentSendFailure::ParameterError(APIError::MonitorUpdateFailed))