1 // This file is Copyright its original authors, visible in version control
4 // This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
5 // or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
6 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
7 // You may not use this file except in accordance with one or both of these
10 //! Utilities to send payments and manage outbound payment information.
12 use bitcoin::hashes::Hash;
13 use bitcoin::hashes::sha256::Hash as Sha256;
14 use bitcoin::secp256k1::{self, Secp256k1, SecretKey};
16 use crate::chain::keysinterface::{EntropySource, NodeSigner, Recipient};
17 use crate::ln::{PaymentHash, PaymentPreimage, PaymentSecret};
18 use crate::ln::channelmanager::{ChannelDetails, HTLCSource, IDEMPOTENCY_TIMEOUT_TICKS, PaymentId};
19 use crate::ln::channelmanager::MIN_FINAL_CLTV_EXPIRY_DELTA as LDK_DEFAULT_MIN_FINAL_CLTV_EXPIRY_DELTA;
20 use crate::ln::msgs::DecodeError;
21 use crate::ln::onion_utils::HTLCFailReason;
22 use crate::routing::router::{InFlightHtlcs, PaymentParameters, Route, RouteHop, RouteParameters, RoutePath, Router};
23 use crate::util::errors::APIError;
24 use crate::util::events;
25 use crate::util::logger::Logger;
26 use crate::util::time::Time;
27 #[cfg(all(not(feature = "no-std"), test))]
28 use crate::util::time::tests::SinceEpoch;
31 use core::fmt::{self, Display, Formatter};
34 use crate::prelude::*;
35 use crate::sync::Mutex;
37 /// Stores the session_priv for each part of a payment that is still pending. For versions 0.0.102
38 /// and later, also stores information for retrying the payment.
39 pub(crate) enum PendingOutboundPayment {
41 session_privs: HashSet<[u8; 32]>,
44 retry_strategy: Option<Retry>,
45 attempts: PaymentAttempts,
46 payment_params: Option<PaymentParameters>,
47 session_privs: HashSet<[u8; 32]>,
48 payment_hash: PaymentHash,
49 payment_secret: Option<PaymentSecret>,
50 keysend_preimage: Option<PaymentPreimage>,
51 pending_amt_msat: u64,
52 /// Used to track the fee paid. Only present if the payment was serialized on 0.0.103+.
53 pending_fee_msat: Option<u64>,
54 /// The total payment amount across all paths, used to verify that a retry is not overpaying.
56 /// Our best known block height at the time this payment was initiated.
57 starting_block_height: u32,
59 /// When a pending payment is fulfilled, we continue tracking it until all pending HTLCs have
60 /// been resolved. This ensures we don't look up pending payments in ChannelMonitors on restart
61 /// and add a pending payment that was already fulfilled.
63 session_privs: HashSet<[u8; 32]>,
64 payment_hash: Option<PaymentHash>,
65 timer_ticks_without_htlcs: u8,
67 /// When a payer gives up trying to retry a payment, they inform us, letting us generate a
68 /// `PaymentFailed` event when all HTLCs have irrevocably failed. This avoids a number of race
69 /// conditions in MPP-aware payment retriers (1), where the possibility of multiple
70 /// `PaymentPathFailed` events with `all_paths_failed` can be pending at once, confusing a
71 /// downstream event handler as to when a payment has actually failed.
73 /// (1) <https://github.com/lightningdevkit/rust-lightning/issues/1164>
75 session_privs: HashSet<[u8; 32]>,
76 payment_hash: PaymentHash,
80 impl PendingOutboundPayment {
81 fn increment_attempts(&mut self) {
82 if let PendingOutboundPayment::Retryable { attempts, .. } = self {
86 fn is_auto_retryable_now(&self) -> bool {
88 PendingOutboundPayment::Retryable { retry_strategy: Some(strategy), attempts, .. } => {
89 strategy.is_retryable_now(&attempts)
94 fn is_retryable_now(&self) -> bool {
96 PendingOutboundPayment::Retryable { retry_strategy: None, .. } => {
97 // We're handling retries manually, we can always retry.
100 PendingOutboundPayment::Retryable { retry_strategy: Some(strategy), attempts, .. } => {
101 strategy.is_retryable_now(&attempts)
106 fn payment_parameters(&mut self) -> Option<&mut PaymentParameters> {
108 PendingOutboundPayment::Retryable { payment_params: Some(ref mut params), .. } => {
114 pub fn insert_previously_failed_scid(&mut self, scid: u64) {
115 if let PendingOutboundPayment::Retryable { payment_params: Some(params), .. } = self {
116 params.previously_failed_channels.push(scid);
119 pub(super) fn is_fulfilled(&self) -> bool {
121 PendingOutboundPayment::Fulfilled { .. } => true,
125 pub(super) fn abandoned(&self) -> bool {
127 PendingOutboundPayment::Abandoned { .. } => true,
131 fn get_pending_fee_msat(&self) -> Option<u64> {
133 PendingOutboundPayment::Retryable { pending_fee_msat, .. } => pending_fee_msat.clone(),
138 fn payment_hash(&self) -> Option<PaymentHash> {
140 PendingOutboundPayment::Legacy { .. } => None,
141 PendingOutboundPayment::Retryable { payment_hash, .. } => Some(*payment_hash),
142 PendingOutboundPayment::Fulfilled { payment_hash, .. } => *payment_hash,
143 PendingOutboundPayment::Abandoned { payment_hash, .. } => Some(*payment_hash),
147 fn mark_fulfilled(&mut self) {
148 let mut session_privs = HashSet::new();
149 core::mem::swap(&mut session_privs, match self {
150 PendingOutboundPayment::Legacy { session_privs } |
151 PendingOutboundPayment::Retryable { session_privs, .. } |
152 PendingOutboundPayment::Fulfilled { session_privs, .. } |
153 PendingOutboundPayment::Abandoned { session_privs, .. }
156 let payment_hash = self.payment_hash();
157 *self = PendingOutboundPayment::Fulfilled { session_privs, payment_hash, timer_ticks_without_htlcs: 0 };
160 fn mark_abandoned(&mut self) -> Result<(), ()> {
161 let mut session_privs = HashSet::new();
162 let our_payment_hash;
163 core::mem::swap(&mut session_privs, match self {
164 PendingOutboundPayment::Legacy { .. } |
165 PendingOutboundPayment::Fulfilled { .. } =>
167 PendingOutboundPayment::Retryable { session_privs, payment_hash, .. } |
168 PendingOutboundPayment::Abandoned { session_privs, payment_hash, .. } => {
169 our_payment_hash = *payment_hash;
173 *self = PendingOutboundPayment::Abandoned { session_privs, payment_hash: our_payment_hash };
177 /// panics if path is None and !self.is_fulfilled
178 fn remove(&mut self, session_priv: &[u8; 32], path: Option<&Vec<RouteHop>>) -> bool {
179 let remove_res = match self {
180 PendingOutboundPayment::Legacy { session_privs } |
181 PendingOutboundPayment::Retryable { session_privs, .. } |
182 PendingOutboundPayment::Fulfilled { session_privs, .. } |
183 PendingOutboundPayment::Abandoned { session_privs, .. } => {
184 session_privs.remove(session_priv)
188 if let PendingOutboundPayment::Retryable { ref mut pending_amt_msat, ref mut pending_fee_msat, .. } = self {
189 let path = path.expect("Fulfilling a payment should always come with a path");
190 let path_last_hop = path.last().expect("Outbound payments must have had a valid path");
191 *pending_amt_msat -= path_last_hop.fee_msat;
192 if let Some(fee_msat) = pending_fee_msat.as_mut() {
193 *fee_msat -= path.get_path_fees();
200 pub(super) fn insert(&mut self, session_priv: [u8; 32], path: &Vec<RouteHop>) -> bool {
201 let insert_res = match self {
202 PendingOutboundPayment::Legacy { session_privs } |
203 PendingOutboundPayment::Retryable { session_privs, .. } => {
204 session_privs.insert(session_priv)
206 PendingOutboundPayment::Fulfilled { .. } => false,
207 PendingOutboundPayment::Abandoned { .. } => false,
210 if let PendingOutboundPayment::Retryable { ref mut pending_amt_msat, ref mut pending_fee_msat, .. } = self {
211 let path_last_hop = path.last().expect("Outbound payments must have had a valid path");
212 *pending_amt_msat += path_last_hop.fee_msat;
213 if let Some(fee_msat) = pending_fee_msat.as_mut() {
214 *fee_msat += path.get_path_fees();
221 pub(super) fn remaining_parts(&self) -> usize {
223 PendingOutboundPayment::Legacy { session_privs } |
224 PendingOutboundPayment::Retryable { session_privs, .. } |
225 PendingOutboundPayment::Fulfilled { session_privs, .. } |
226 PendingOutboundPayment::Abandoned { session_privs, .. } => {
233 /// Strategies available to retry payment path failures.
234 #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
236 /// Max number of attempts to retry payment.
238 /// Each attempt may be multiple HTLCs along multiple paths if the router decides to split up a
239 /// retry, and may retry multiple failed HTLCs at once if they failed around the same time and
240 /// were retried along a route from a single call to [`Router::find_route`].
242 #[cfg(not(feature = "no-std"))]
243 /// Time elapsed before abandoning retries for a payment.
244 Timeout(core::time::Duration),
248 pub(crate) fn is_retryable_now(&self, attempts: &PaymentAttempts) -> bool {
249 match (self, attempts) {
250 (Retry::Attempts(max_retry_count), PaymentAttempts { count, .. }) => {
251 max_retry_count > count
253 #[cfg(all(not(feature = "no-std"), not(test)))]
254 (Retry::Timeout(max_duration), PaymentAttempts { first_attempted_at, .. }) =>
255 *max_duration >= std::time::Instant::now().duration_since(*first_attempted_at),
256 #[cfg(all(not(feature = "no-std"), test))]
257 (Retry::Timeout(max_duration), PaymentAttempts { first_attempted_at, .. }) =>
258 *max_duration >= SinceEpoch::now().duration_since(*first_attempted_at),
263 #[cfg(feature = "std")]
264 pub(super) fn has_expired(route_params: &RouteParameters) -> bool {
265 if let Some(expiry_time) = route_params.payment_params.expiry_time {
266 if let Ok(elapsed) = std::time::SystemTime::UNIX_EPOCH.elapsed() {
267 return elapsed > core::time::Duration::from_secs(expiry_time)
273 pub(crate) type PaymentAttempts = PaymentAttemptsUsingTime<ConfiguredTime>;
275 /// Storing minimal payment attempts information required for determining if a outbound payment can
277 pub(crate) struct PaymentAttemptsUsingTime<T: Time> {
278 /// This count will be incremented only after the result of the attempt is known. When it's 0,
279 /// it means the result of the first attempt is not known yet.
280 pub(crate) count: usize,
281 /// This field is only used when retry is `Retry::Timeout` which is only build with feature std
282 first_attempted_at: T
285 #[cfg(not(any(feature = "no-std", test)))]
286 type ConfiguredTime = std::time::Instant;
287 #[cfg(feature = "no-std")]
288 type ConfiguredTime = crate::util::time::Eternity;
289 #[cfg(all(not(feature = "no-std"), test))]
290 type ConfiguredTime = SinceEpoch;
292 impl<T: Time> PaymentAttemptsUsingTime<T> {
293 pub(crate) fn new() -> Self {
294 PaymentAttemptsUsingTime {
296 first_attempted_at: T::now()
301 impl<T: Time> Display for PaymentAttemptsUsingTime<T> {
302 fn fmt(&self, f: &mut Formatter) -> Result<(), fmt::Error> {
303 #[cfg(feature = "no-std")]
304 return write!(f, "attempts: {}", self.count);
305 #[cfg(not(feature = "no-std"))]
308 "attempts: {}, duration: {}s",
310 T::now().duration_since(self.first_attempted_at).as_secs()
315 /// If a payment fails to send, it can be in one of several states. This enum is returned as the
316 /// Err() type describing which state the payment is in, see the description of individual enum
318 #[derive(Clone, Debug)]
319 pub enum PaymentSendFailure {
320 /// A parameter which was passed to send_payment was invalid, preventing us from attempting to
321 /// send the payment at all.
323 /// You can freely resend the payment in full (with the parameter error fixed).
325 /// Because the payment failed outright, no payment tracking is done and no
326 /// [`Event::PaymentPathFailed`] or [`Event::PaymentFailed`] events will be generated.
328 /// [`Event::PaymentPathFailed`]: crate::util::events::Event::PaymentPathFailed
329 /// [`Event::PaymentFailed`]: crate::util::events::Event::PaymentFailed
330 ParameterError(APIError),
331 /// A parameter in a single path which was passed to send_payment was invalid, preventing us
332 /// from attempting to send the payment at all.
334 /// You can freely resend the payment in full (with the parameter error fixed).
336 /// Because the payment failed outright, no payment tracking is done and no
337 /// [`Event::PaymentPathFailed`] or [`Event::PaymentFailed`] events will be generated.
339 /// The results here are ordered the same as the paths in the route object which was passed to
342 /// [`Event::PaymentPathFailed`]: crate::util::events::Event::PaymentPathFailed
343 /// [`Event::PaymentFailed`]: crate::util::events::Event::PaymentFailed
344 PathParameterError(Vec<Result<(), APIError>>),
345 /// All paths which were attempted failed to send, with no channel state change taking place.
346 /// You can freely resend the payment in full (though you probably want to do so over different
347 /// paths than the ones selected).
349 /// Because the payment failed outright, no payment tracking is done and no
350 /// [`Event::PaymentPathFailed`] or [`Event::PaymentFailed`] events will be generated.
352 /// [`Event::PaymentPathFailed`]: crate::util::events::Event::PaymentPathFailed
353 /// [`Event::PaymentFailed`]: crate::util::events::Event::PaymentFailed
354 AllFailedResendSafe(Vec<APIError>),
355 /// Indicates that a payment for the provided [`PaymentId`] is already in-flight and has not
356 /// yet completed (i.e. generated an [`Event::PaymentSent`] or [`Event::PaymentFailed`]).
358 /// [`PaymentId`]: crate::ln::channelmanager::PaymentId
359 /// [`Event::PaymentSent`]: crate::util::events::Event::PaymentSent
360 /// [`Event::PaymentFailed`]: crate::util::events::Event::PaymentFailed
362 /// Some paths that were attempted failed to send, though some paths may have succeeded. At least
363 /// some paths have irrevocably committed to the HTLC.
365 /// The results here are ordered the same as the paths in the route object that was passed to
368 /// Any entries that contain `Err(APIError::MonitorUpdateInprogress)` will send once a
369 /// [`MonitorEvent::Completed`] is provided for the next-hop channel with the latest update_id.
371 /// [`MonitorEvent::Completed`]: crate::chain::channelmonitor::MonitorEvent::Completed
373 /// The errors themselves, in the same order as the paths from the route.
374 results: Vec<Result<(), APIError>>,
375 /// If some paths failed without irrevocably committing to the new HTLC(s), this will
376 /// contain a [`RouteParameters`] object for the failing paths.
377 failed_paths_retry: Option<RouteParameters>,
378 /// The payment id for the payment, which is now at least partially pending.
379 payment_id: PaymentId,
383 pub(super) struct OutboundPayments {
384 pub(super) pending_outbound_payments: Mutex<HashMap<PaymentId, PendingOutboundPayment>>,
385 pub(super) retry_lock: Mutex<()>,
388 impl OutboundPayments {
389 pub(super) fn new() -> Self {
391 pending_outbound_payments: Mutex::new(HashMap::new()),
392 retry_lock: Mutex::new(()),
396 pub(super) fn send_payment<R: Deref, ES: Deref, NS: Deref, IH, SP, L: Deref>(
397 &self, payment_hash: PaymentHash, payment_secret: &Option<PaymentSecret>, payment_id: PaymentId,
398 retry_strategy: Retry, route_params: RouteParameters, router: &R,
399 first_hops: Vec<ChannelDetails>, compute_inflight_htlcs: IH, entropy_source: &ES,
400 node_signer: &NS, best_block_height: u32, logger: &L,
401 pending_events: &Mutex<Vec<events::Event>>, send_payment_along_path: SP,
402 ) -> Result<(), PaymentSendFailure>
405 ES::Target: EntropySource,
406 NS::Target: NodeSigner,
408 IH: Fn() -> InFlightHtlcs,
409 SP: Fn(&Vec<RouteHop>, &Option<PaymentParameters>, &PaymentHash, &Option<PaymentSecret>, u64,
410 u32, PaymentId, &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>,
412 self.pay_internal(payment_id, payment_hash, Some((payment_secret, None, retry_strategy)),
413 route_params, router, first_hops, &compute_inflight_htlcs, entropy_source, node_signer,
414 best_block_height, logger, pending_events, &send_payment_along_path)
415 .map_err(|e| { self.remove_outbound_if_all_failed(payment_id, &e); e })
418 pub(super) fn send_payment_with_route<ES: Deref, NS: Deref, F>(
419 &self, route: &Route, payment_hash: PaymentHash, payment_secret: &Option<PaymentSecret>,
420 payment_id: PaymentId, entropy_source: &ES, node_signer: &NS, best_block_height: u32,
421 send_payment_along_path: F
422 ) -> Result<(), PaymentSendFailure>
424 ES::Target: EntropySource,
425 NS::Target: NodeSigner,
426 F: Fn(&Vec<RouteHop>, &Option<PaymentParameters>, &PaymentHash, &Option<PaymentSecret>, u64,
427 u32, PaymentId, &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
429 let onion_session_privs = self.add_new_pending_payment(payment_hash, *payment_secret, payment_id, None, route, None, None, entropy_source, best_block_height)?;
430 self.pay_route_internal(route, payment_hash, payment_secret, None, payment_id, None,
431 onion_session_privs, node_signer, best_block_height, &send_payment_along_path)
432 .map_err(|e| { self.remove_outbound_if_all_failed(payment_id, &e); e })
435 pub(super) fn send_spontaneous_payment<R: Deref, ES: Deref, NS: Deref, IH, SP, L: Deref>(
436 &self, payment_preimage: Option<PaymentPreimage>, payment_id: PaymentId,
437 retry_strategy: Retry, route_params: RouteParameters, router: &R,
438 first_hops: Vec<ChannelDetails>, inflight_htlcs: IH, entropy_source: &ES,
439 node_signer: &NS, best_block_height: u32, logger: &L,
440 pending_events: &Mutex<Vec<events::Event>>, send_payment_along_path: SP
441 ) -> Result<PaymentHash, PaymentSendFailure>
444 ES::Target: EntropySource,
445 NS::Target: NodeSigner,
447 IH: Fn() -> InFlightHtlcs,
448 SP: Fn(&Vec<RouteHop>, &Option<PaymentParameters>, &PaymentHash, &Option<PaymentSecret>, u64,
449 u32, PaymentId, &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>,
451 let preimage = payment_preimage
452 .unwrap_or_else(|| PaymentPreimage(entropy_source.get_secure_random_bytes()));
453 let payment_hash = PaymentHash(Sha256::hash(&preimage.0).into_inner());
454 self.pay_internal(payment_id, payment_hash, Some((&None, Some(preimage), retry_strategy)),
455 route_params, router, first_hops, &inflight_htlcs, entropy_source, node_signer,
456 best_block_height, logger, pending_events, &send_payment_along_path)
457 .map(|()| payment_hash)
458 .map_err(|e| { self.remove_outbound_if_all_failed(payment_id, &e); e })
461 pub(super) fn send_spontaneous_payment_with_route<ES: Deref, NS: Deref, F>(
462 &self, route: &Route, payment_preimage: Option<PaymentPreimage>, payment_id: PaymentId,
463 entropy_source: &ES, node_signer: &NS, best_block_height: u32, send_payment_along_path: F
464 ) -> Result<PaymentHash, PaymentSendFailure>
466 ES::Target: EntropySource,
467 NS::Target: NodeSigner,
468 F: Fn(&Vec<RouteHop>, &Option<PaymentParameters>, &PaymentHash, &Option<PaymentSecret>, u64,
469 u32, PaymentId, &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
471 let preimage = payment_preimage
472 .unwrap_or_else(|| PaymentPreimage(entropy_source.get_secure_random_bytes()));
473 let payment_hash = PaymentHash(Sha256::hash(&preimage.0).into_inner());
474 let onion_session_privs = self.add_new_pending_payment(payment_hash, None, payment_id, Some(preimage), &route, None, None, entropy_source, best_block_height)?;
476 match self.pay_route_internal(route, payment_hash, &None, Some(preimage), payment_id, None, onion_session_privs, node_signer, best_block_height, &send_payment_along_path) {
477 Ok(()) => Ok(payment_hash),
479 self.remove_outbound_if_all_failed(payment_id, &e);
485 pub(super) fn check_retry_payments<R: Deref, ES: Deref, NS: Deref, SP, IH, FH, L: Deref>(
486 &self, router: &R, first_hops: FH, inflight_htlcs: IH, entropy_source: &ES, node_signer: &NS,
487 best_block_height: u32, pending_events: &Mutex<Vec<events::Event>>, logger: &L,
488 send_payment_along_path: SP,
492 ES::Target: EntropySource,
493 NS::Target: NodeSigner,
494 SP: Fn(&Vec<RouteHop>, &Option<PaymentParameters>, &PaymentHash, &Option<PaymentSecret>, u64,
495 u32, PaymentId, &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>,
496 IH: Fn() -> InFlightHtlcs,
497 FH: Fn() -> Vec<ChannelDetails>,
500 let _single_thread = self.retry_lock.lock().unwrap();
502 let mut outbounds = self.pending_outbound_payments.lock().unwrap();
503 let mut retry_id_route_params = None;
504 for (pmt_id, pmt) in outbounds.iter_mut() {
505 if pmt.is_auto_retryable_now() {
506 if let PendingOutboundPayment::Retryable { payment_hash, pending_amt_msat, total_msat, payment_params: Some(params), .. } = pmt {
507 if pending_amt_msat < total_msat {
508 retry_id_route_params = Some((*pmt_id, *payment_hash, RouteParameters {
509 final_value_msat: *total_msat - *pending_amt_msat,
510 final_cltv_expiry_delta:
511 if let Some(delta) = params.final_cltv_expiry_delta { delta }
513 debug_assert!(false, "We always set the final_cltv_expiry_delta when a path fails");
514 LDK_DEFAULT_MIN_FINAL_CLTV_EXPIRY_DELTA.into()
516 payment_params: params.clone(),
523 core::mem::drop(outbounds);
524 if let Some((payment_id, payment_hash, route_params)) = retry_id_route_params {
525 if let Err(e) = self.pay_internal(payment_id, payment_hash, None, route_params, router, first_hops(), &inflight_htlcs, entropy_source, node_signer, best_block_height, logger, pending_events, &send_payment_along_path) {
526 log_info!(logger, "Errored retrying payment: {:?}", e);
527 // If we error on retry, there is no chance of the payment succeeding and no HTLCs have
528 // been irrevocably committed to, so we can safely abandon.
529 self.abandon_payment(payment_id, pending_events);
534 let mut outbounds = self.pending_outbound_payments.lock().unwrap();
535 outbounds.retain(|pmt_id, pmt| {
536 let mut retain = true;
537 if !pmt.is_auto_retryable_now() && pmt.remaining_parts() == 0 {
538 if pmt.mark_abandoned().is_ok() {
539 pending_events.lock().unwrap().push(events::Event::PaymentFailed {
541 payment_hash: pmt.payment_hash().expect("PendingOutboundPayments::Retryable always has a payment hash set"),
550 pub(super) fn needs_abandon(&self) -> bool {
551 let outbounds = self.pending_outbound_payments.lock().unwrap();
552 outbounds.iter().any(|(_, pmt)|
553 !pmt.is_auto_retryable_now() && pmt.remaining_parts() == 0 && !pmt.is_fulfilled())
556 /// Will return `Ok(())` iff at least one HTLC is sent for the payment.
557 fn pay_internal<R: Deref, NS: Deref, ES: Deref, IH, SP, L: Deref>(
558 &self, payment_id: PaymentId, payment_hash: PaymentHash,
559 initial_send_info: Option<(&Option<PaymentSecret>, Option<PaymentPreimage>, Retry)>,
560 route_params: RouteParameters, router: &R, first_hops: Vec<ChannelDetails>,
561 inflight_htlcs: &IH, entropy_source: &ES, node_signer: &NS, best_block_height: u32,
562 logger: &L, pending_events: &Mutex<Vec<events::Event>>, send_payment_along_path: &SP,
563 ) -> Result<(), PaymentSendFailure>
566 ES::Target: EntropySource,
567 NS::Target: NodeSigner,
569 IH: Fn() -> InFlightHtlcs,
570 SP: Fn(&Vec<RouteHop>, &Option<PaymentParameters>, &PaymentHash, &Option<PaymentSecret>, u64,
571 u32, PaymentId, &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
573 #[cfg(feature = "std")] {
574 if has_expired(&route_params) {
575 return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
576 err: format!("Invoice expired for payment id {}", log_bytes!(payment_id.0)),
581 let route = router.find_route(
582 &node_signer.get_node_id(Recipient::Node).unwrap(), &route_params,
583 Some(&first_hops.iter().collect::<Vec<_>>()), &inflight_htlcs(),
584 ).map_err(|e| PaymentSendFailure::ParameterError(APIError::APIMisuseError {
585 err: format!("Failed to find a route for payment {}: {:?}", log_bytes!(payment_id.0), e), // TODO: add APIError::RouteNotFound
588 let res = if let Some((payment_secret, keysend_preimage, retry_strategy)) = initial_send_info {
589 let onion_session_privs = self.add_new_pending_payment(payment_hash, *payment_secret, payment_id, keysend_preimage, &route, Some(retry_strategy), Some(route_params.payment_params.clone()), entropy_source, best_block_height)?;
590 self.pay_route_internal(&route, payment_hash, payment_secret, None, payment_id, None, onion_session_privs, node_signer, best_block_height, send_payment_along_path)
592 self.retry_payment_with_route(&route, payment_id, entropy_source, node_signer, best_block_height, send_payment_along_path)
595 Err(PaymentSendFailure::AllFailedResendSafe(_)) => {
596 let retry_res = self.pay_internal(payment_id, payment_hash, None, route_params, router, first_hops, inflight_htlcs, entropy_source, node_signer, best_block_height, logger, pending_events, send_payment_along_path);
597 log_info!(logger, "Result retrying payment id {}: {:?}", log_bytes!(payment_id.0), retry_res);
598 if let Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError { err })) = &retry_res {
599 if err.starts_with("Retries exhausted ") { return res; }
603 Err(PaymentSendFailure::PartialFailure { failed_paths_retry: Some(retry), .. }) => {
604 // Some paths were sent, even if we failed to send the full MPP value our recipient may
605 // misbehave and claim the funds, at which point we have to consider the payment sent, so
606 // return `Ok()` here, ignoring any retry errors.
607 let retry_res = self.pay_internal(payment_id, payment_hash, None, retry, router, first_hops, inflight_htlcs, entropy_source, node_signer, best_block_height, logger, pending_events, send_payment_along_path);
608 log_info!(logger, "Result retrying payment id {}: {:?}", log_bytes!(payment_id.0), retry_res);
611 Err(PaymentSendFailure::PartialFailure { failed_paths_retry: None, .. }) => {
612 // This may happen if we send a payment and some paths fail, but only due to a temporary
613 // monitor failure or the like, implying they're really in-flight, but we haven't sent the
614 // initial HTLC-Add messages yet.
621 pub(super) fn retry_payment_with_route<ES: Deref, NS: Deref, F>(
622 &self, route: &Route, payment_id: PaymentId, entropy_source: &ES, node_signer: &NS, best_block_height: u32,
623 send_payment_along_path: F
624 ) -> Result<(), PaymentSendFailure>
626 ES::Target: EntropySource,
627 NS::Target: NodeSigner,
628 F: Fn(&Vec<RouteHop>, &Option<PaymentParameters>, &PaymentHash, &Option<PaymentSecret>, u64,
629 u32, PaymentId, &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
631 const RETRY_OVERFLOW_PERCENTAGE: u64 = 10;
632 for path in route.paths.iter() {
634 return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
635 err: "length-0 path in route".to_string()
640 let mut onion_session_privs = Vec::with_capacity(route.paths.len());
641 for _ in 0..route.paths.len() {
642 onion_session_privs.push(entropy_source.get_secure_random_bytes());
645 let (total_msat, payment_hash, payment_secret, keysend_preimage) = {
646 let mut outbounds = self.pending_outbound_payments.lock().unwrap();
647 match outbounds.get_mut(&payment_id) {
649 let res = match payment {
650 PendingOutboundPayment::Retryable {
651 total_msat, payment_hash, keysend_preimage, payment_secret, pending_amt_msat, ..
653 let retry_amt_msat: u64 = route.paths.iter().map(|path| path.last().unwrap().fee_msat).sum();
654 if retry_amt_msat + *pending_amt_msat > *total_msat * (100 + RETRY_OVERFLOW_PERCENTAGE) / 100 {
655 return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
656 err: format!("retry_amt_msat of {} will put pending_amt_msat (currently: {}) more than 10% over total_payment_amt_msat of {}", retry_amt_msat, pending_amt_msat, total_msat).to_string()
659 (*total_msat, *payment_hash, *payment_secret, *keysend_preimage)
661 PendingOutboundPayment::Legacy { .. } => {
662 return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
663 err: "Unable to retry payments that were initially sent on LDK versions prior to 0.0.102".to_string()
666 PendingOutboundPayment::Fulfilled { .. } => {
667 return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
668 err: "Payment already completed".to_owned()
671 PendingOutboundPayment::Abandoned { .. } => {
672 return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
673 err: "Payment already abandoned (with some HTLCs still pending)".to_owned()
677 if !payment.is_retryable_now() {
678 return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
679 err: format!("Retries exhausted for payment id {}", log_bytes!(payment_id.0)),
682 payment.increment_attempts();
683 for (path, session_priv_bytes) in route.paths.iter().zip(onion_session_privs.iter()) {
684 assert!(payment.insert(*session_priv_bytes, path));
689 return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
690 err: format!("Payment with ID {} not found", log_bytes!(payment_id.0)),
694 self.pay_route_internal(route, payment_hash, &payment_secret, keysend_preimage, payment_id, Some(total_msat), onion_session_privs, node_signer, best_block_height, &send_payment_along_path)
697 pub(super) fn send_probe<ES: Deref, NS: Deref, F>(
698 &self, hops: Vec<RouteHop>, probing_cookie_secret: [u8; 32], entropy_source: &ES,
699 node_signer: &NS, best_block_height: u32, send_payment_along_path: F
700 ) -> Result<(PaymentHash, PaymentId), PaymentSendFailure>
702 ES::Target: EntropySource,
703 NS::Target: NodeSigner,
704 F: Fn(&Vec<RouteHop>, &Option<PaymentParameters>, &PaymentHash, &Option<PaymentSecret>, u64,
705 u32, PaymentId, &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
707 let payment_id = PaymentId(entropy_source.get_secure_random_bytes());
709 let payment_hash = probing_cookie_from_id(&payment_id, probing_cookie_secret);
712 return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
713 err: "No need probing a path with less than two hops".to_string()
717 let route = Route { paths: vec![hops], payment_params: None };
718 let onion_session_privs = self.add_new_pending_payment(payment_hash, None, payment_id, None, &route, None, None, entropy_source, best_block_height)?;
720 match self.pay_route_internal(&route, payment_hash, &None, None, payment_id, None, onion_session_privs, node_signer, best_block_height, &send_payment_along_path) {
721 Ok(()) => Ok((payment_hash, payment_id)),
723 self.remove_outbound_if_all_failed(payment_id, &e);
730 pub(super) fn test_add_new_pending_payment<ES: Deref>(
731 &self, payment_hash: PaymentHash, payment_secret: Option<PaymentSecret>, payment_id: PaymentId,
732 route: &Route, retry_strategy: Option<Retry>, entropy_source: &ES, best_block_height: u32
733 ) -> Result<Vec<[u8; 32]>, PaymentSendFailure> where ES::Target: EntropySource {
734 self.add_new_pending_payment(payment_hash, payment_secret, payment_id, None, route, retry_strategy, None, entropy_source, best_block_height)
737 pub(super) fn add_new_pending_payment<ES: Deref>(
738 &self, payment_hash: PaymentHash, payment_secret: Option<PaymentSecret>, payment_id: PaymentId,
739 keysend_preimage: Option<PaymentPreimage>, route: &Route, retry_strategy: Option<Retry>,
740 payment_params: Option<PaymentParameters>, entropy_source: &ES, best_block_height: u32
741 ) -> Result<Vec<[u8; 32]>, PaymentSendFailure> where ES::Target: EntropySource {
742 let mut onion_session_privs = Vec::with_capacity(route.paths.len());
743 for _ in 0..route.paths.len() {
744 onion_session_privs.push(entropy_source.get_secure_random_bytes());
747 let mut pending_outbounds = self.pending_outbound_payments.lock().unwrap();
748 match pending_outbounds.entry(payment_id) {
749 hash_map::Entry::Occupied(_) => Err(PaymentSendFailure::DuplicatePayment),
750 hash_map::Entry::Vacant(entry) => {
751 let payment = entry.insert(PendingOutboundPayment::Retryable {
753 attempts: PaymentAttempts::new(),
755 session_privs: HashSet::new(),
757 pending_fee_msat: Some(0),
761 starting_block_height: best_block_height,
762 total_msat: route.get_total_amount(),
765 for (path, session_priv_bytes) in route.paths.iter().zip(onion_session_privs.iter()) {
766 assert!(payment.insert(*session_priv_bytes, path));
769 Ok(onion_session_privs)
774 fn pay_route_internal<NS: Deref, F>(
775 &self, route: &Route, payment_hash: PaymentHash, payment_secret: &Option<PaymentSecret>,
776 keysend_preimage: Option<PaymentPreimage>, payment_id: PaymentId, recv_value_msat: Option<u64>,
777 onion_session_privs: Vec<[u8; 32]>, node_signer: &NS, best_block_height: u32,
778 send_payment_along_path: &F
779 ) -> Result<(), PaymentSendFailure>
781 NS::Target: NodeSigner,
782 F: Fn(&Vec<RouteHop>, &Option<PaymentParameters>, &PaymentHash, &Option<PaymentSecret>, u64,
783 u32, PaymentId, &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
785 if route.paths.len() < 1 {
786 return Err(PaymentSendFailure::ParameterError(APIError::InvalidRoute{err: "There must be at least one path to send over"}));
788 if payment_secret.is_none() && route.paths.len() > 1 {
789 return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError{err: "Payment secret is required for multi-path payments".to_string()}));
791 let mut total_value = 0;
792 let our_node_id = node_signer.get_node_id(Recipient::Node).unwrap(); // TODO no unwrap
793 let mut path_errs = Vec::with_capacity(route.paths.len());
794 'path_check: for path in route.paths.iter() {
795 if path.len() < 1 || path.len() > 20 {
796 path_errs.push(Err(APIError::InvalidRoute{err: "Path didn't go anywhere/had bogus size"}));
797 continue 'path_check;
799 for (idx, hop) in path.iter().enumerate() {
800 if idx != path.len() - 1 && hop.pubkey == our_node_id {
801 path_errs.push(Err(APIError::InvalidRoute{err: "Path went through us but wasn't a simple rebalance loop to us"}));
802 continue 'path_check;
805 total_value += path.last().unwrap().fee_msat;
806 path_errs.push(Ok(()));
808 if path_errs.iter().any(|e| e.is_err()) {
809 return Err(PaymentSendFailure::PathParameterError(path_errs));
811 if let Some(amt_msat) = recv_value_msat {
812 debug_assert!(amt_msat >= total_value);
813 total_value = amt_msat;
816 let cur_height = best_block_height + 1;
817 let mut results = Vec::new();
818 debug_assert_eq!(route.paths.len(), onion_session_privs.len());
819 for (path, session_priv) in route.paths.iter().zip(onion_session_privs.into_iter()) {
820 let mut path_res = send_payment_along_path(&path, &route.payment_params, &payment_hash, payment_secret, total_value, cur_height, payment_id, &keysend_preimage, session_priv);
823 Err(APIError::MonitorUpdateInProgress) => {
824 // While a MonitorUpdateInProgress is an Err(_), the payment is still
825 // considered "in flight" and we shouldn't remove it from the
826 // PendingOutboundPayment set.
829 let mut pending_outbounds = self.pending_outbound_payments.lock().unwrap();
830 if let Some(payment) = pending_outbounds.get_mut(&payment_id) {
831 let removed = payment.remove(&session_priv, Some(path));
832 debug_assert!(removed, "This can't happen as the payment has an entry for this path added by callers");
834 debug_assert!(false, "This can't happen as the payment was added by callers");
835 path_res = Err(APIError::APIMisuseError { err: "Internal error: payment disappeared during processing. Please report this bug!".to_owned() });
839 results.push(path_res);
841 let mut has_ok = false;
842 let mut has_err = false;
843 let mut pending_amt_unsent = 0;
844 let mut max_unsent_cltv_delta = 0;
845 for (res, path) in results.iter().zip(route.paths.iter()) {
846 if res.is_ok() { has_ok = true; }
847 if res.is_err() { has_err = true; }
848 if let &Err(APIError::MonitorUpdateInProgress) = res {
849 // MonitorUpdateInProgress is inherently unsafe to retry, so we call it a
853 } else if res.is_err() {
854 pending_amt_unsent += path.last().unwrap().fee_msat;
855 max_unsent_cltv_delta = cmp::max(max_unsent_cltv_delta, path.last().unwrap().cltv_expiry_delta);
858 if has_err && has_ok {
859 Err(PaymentSendFailure::PartialFailure {
862 failed_paths_retry: if pending_amt_unsent != 0 {
863 if let Some(payment_params) = &route.payment_params {
864 Some(RouteParameters {
865 payment_params: payment_params.clone(),
866 final_value_msat: pending_amt_unsent,
867 final_cltv_expiry_delta:
868 if let Some(delta) = payment_params.final_cltv_expiry_delta { delta }
869 else { max_unsent_cltv_delta },
875 Err(PaymentSendFailure::AllFailedResendSafe(results.drain(..).map(|r| r.unwrap_err()).collect()))
882 pub(super) fn test_send_payment_internal<NS: Deref, F>(
883 &self, route: &Route, payment_hash: PaymentHash, payment_secret: &Option<PaymentSecret>,
884 keysend_preimage: Option<PaymentPreimage>, payment_id: PaymentId, recv_value_msat: Option<u64>,
885 onion_session_privs: Vec<[u8; 32]>, node_signer: &NS, best_block_height: u32,
886 send_payment_along_path: F
887 ) -> Result<(), PaymentSendFailure>
889 NS::Target: NodeSigner,
890 F: Fn(&Vec<RouteHop>, &Option<PaymentParameters>, &PaymentHash, &Option<PaymentSecret>, u64,
891 u32, PaymentId, &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
893 self.pay_route_internal(route, payment_hash, payment_secret, keysend_preimage, payment_id,
894 recv_value_msat, onion_session_privs, node_signer, best_block_height,
895 &send_payment_along_path)
896 .map_err(|e| { self.remove_outbound_if_all_failed(payment_id, &e); e })
899 // If we failed to send any paths, remove the new PaymentId from the `pending_outbound_payments`
900 // map as the payment is free to be resent.
901 fn remove_outbound_if_all_failed(&self, payment_id: PaymentId, err: &PaymentSendFailure) {
902 if let &PaymentSendFailure::AllFailedResendSafe(_) = err {
903 let removed = self.pending_outbound_payments.lock().unwrap().remove(&payment_id).is_some();
904 debug_assert!(removed, "We should always have a pending payment to remove here");
908 pub(super) fn claim_htlc<L: Deref>(
909 &self, payment_id: PaymentId, payment_preimage: PaymentPreimage, session_priv: SecretKey,
910 path: Vec<RouteHop>, from_onchain: bool, pending_events: &Mutex<Vec<events::Event>>, logger: &L
911 ) where L::Target: Logger {
912 let mut session_priv_bytes = [0; 32];
913 session_priv_bytes.copy_from_slice(&session_priv[..]);
914 let mut outbounds = self.pending_outbound_payments.lock().unwrap();
915 let mut pending_events = pending_events.lock().unwrap();
916 if let hash_map::Entry::Occupied(mut payment) = outbounds.entry(payment_id) {
917 if !payment.get().is_fulfilled() {
918 let payment_hash = PaymentHash(Sha256::hash(&payment_preimage.0).into_inner());
919 let fee_paid_msat = payment.get().get_pending_fee_msat();
921 events::Event::PaymentSent {
922 payment_id: Some(payment_id),
928 payment.get_mut().mark_fulfilled();
932 // We currently immediately remove HTLCs which were fulfilled on-chain.
933 // This could potentially lead to removing a pending payment too early,
934 // with a reorg of one block causing us to re-add the fulfilled payment on
936 // TODO: We should have a second monitor event that informs us of payments
937 // irrevocably fulfilled.
938 if payment.get_mut().remove(&session_priv_bytes, Some(&path)) {
939 let payment_hash = Some(PaymentHash(Sha256::hash(&payment_preimage.0).into_inner()));
941 events::Event::PaymentPathSuccessful {
950 log_trace!(logger, "Received duplicative fulfill for HTLC with payment_preimage {}", log_bytes!(payment_preimage.0));
954 pub(super) fn finalize_claims(&self, sources: Vec<HTLCSource>, pending_events: &Mutex<Vec<events::Event>>) {
955 let mut outbounds = self.pending_outbound_payments.lock().unwrap();
956 let mut pending_events = pending_events.lock().unwrap();
957 for source in sources {
958 if let HTLCSource::OutboundRoute { session_priv, payment_id, path, .. } = source {
959 let mut session_priv_bytes = [0; 32];
960 session_priv_bytes.copy_from_slice(&session_priv[..]);
961 if let hash_map::Entry::Occupied(mut payment) = outbounds.entry(payment_id) {
962 assert!(payment.get().is_fulfilled());
963 if payment.get_mut().remove(&session_priv_bytes, None) {
965 events::Event::PaymentPathSuccessful {
967 payment_hash: payment.get().payment_hash(),
977 pub(super) fn remove_stale_resolved_payments(&self, pending_events: &Mutex<Vec<events::Event>>) {
978 // If an outbound payment was completed, and no pending HTLCs remain, we should remove it
979 // from the map. However, if we did that immediately when the last payment HTLC is claimed,
980 // this could race the user making a duplicate send_payment call and our idempotency
981 // guarantees would be violated. Instead, we wait a few timer ticks to do the actual
982 // removal. This should be more than sufficient to ensure the idempotency of any
983 // `send_payment` calls that were made at the same time the `PaymentSent` event was being
985 let mut pending_outbound_payments = self.pending_outbound_payments.lock().unwrap();
986 let pending_events = pending_events.lock().unwrap();
987 pending_outbound_payments.retain(|payment_id, payment| {
988 if let PendingOutboundPayment::Fulfilled { session_privs, timer_ticks_without_htlcs, .. } = payment {
989 let mut no_remaining_entries = session_privs.is_empty();
990 if no_remaining_entries {
991 for ev in pending_events.iter() {
993 events::Event::PaymentSent { payment_id: Some(ev_payment_id), .. } |
994 events::Event::PaymentPathSuccessful { payment_id: ev_payment_id, .. } |
995 events::Event::PaymentPathFailed { payment_id: Some(ev_payment_id), .. } => {
996 if payment_id == ev_payment_id {
997 no_remaining_entries = false;
1005 if no_remaining_entries {
1006 *timer_ticks_without_htlcs += 1;
1007 *timer_ticks_without_htlcs <= IDEMPOTENCY_TIMEOUT_TICKS
1009 *timer_ticks_without_htlcs = 0;
1016 // Returns a bool indicating whether a PendingHTLCsForwardable event should be generated.
1017 pub(super) fn fail_htlc<L: Deref>(
1018 &self, source: &HTLCSource, payment_hash: &PaymentHash, onion_error: &HTLCFailReason,
1019 path: &Vec<RouteHop>, session_priv: &SecretKey, payment_id: &PaymentId,
1020 payment_params: &Option<PaymentParameters>, probing_cookie_secret: [u8; 32],
1021 secp_ctx: &Secp256k1<secp256k1::All>, pending_events: &Mutex<Vec<events::Event>>, logger: &L
1022 ) -> bool where L::Target: Logger {
1024 let (network_update, short_channel_id, payment_retryable, onion_error_code, onion_error_data) = onion_error.decode_onion_failure(secp_ctx, logger, &source);
1026 let (network_update, short_channel_id, payment_retryable, _, _) = onion_error.decode_onion_failure(secp_ctx, logger, &source);
1028 let payment_is_probe = payment_is_probe(payment_hash, &payment_id, probing_cookie_secret);
1029 let mut session_priv_bytes = [0; 32];
1030 session_priv_bytes.copy_from_slice(&session_priv[..]);
1031 let mut outbounds = self.pending_outbound_payments.lock().unwrap();
1033 // If any payments already need retry, there's no need to generate a redundant
1034 // `PendingHTLCsForwardable`.
1035 let already_awaiting_retry = outbounds.iter().any(|(_, pmt)| {
1036 let mut awaiting_retry = false;
1037 if pmt.is_auto_retryable_now() {
1038 if let PendingOutboundPayment::Retryable { pending_amt_msat, total_msat, .. } = pmt {
1039 if pending_amt_msat < total_msat {
1040 awaiting_retry = true;
1047 let mut all_paths_failed = false;
1048 let mut full_failure_ev = None;
1049 let mut pending_retry_ev = false;
1050 let mut retry = None;
1051 let attempts_remaining = if let hash_map::Entry::Occupied(mut payment) = outbounds.entry(*payment_id) {
1052 if !payment.get_mut().remove(&session_priv_bytes, Some(&path)) {
1053 log_trace!(logger, "Received duplicative fail for HTLC with payment_hash {}", log_bytes!(payment_hash.0));
1056 if payment.get().is_fulfilled() {
1057 log_trace!(logger, "Received failure of HTLC with payment_hash {} after payment completion", log_bytes!(payment_hash.0));
1060 let mut is_retryable_now = payment.get().is_auto_retryable_now();
1061 if let Some(scid) = short_channel_id {
1062 payment.get_mut().insert_previously_failed_scid(scid);
1065 // We want to move towards only using the `PaymentParameters` in the outbound payments
1066 // map. However, for backwards-compatibility, we still need to support passing the
1067 // `PaymentParameters` data that was shoved in the HTLC (and given to us via
1068 // `payment_params`) back to the user.
1069 let path_last_hop = path.last().expect("Outbound payments must have had a valid path");
1070 if let Some(params) = payment.get_mut().payment_parameters() {
1071 if params.final_cltv_expiry_delta.is_none() {
1072 // This should be rare, but a user could provide None for the payment data, and
1073 // we need it when we go to retry the payment, so fill it in.
1074 params.final_cltv_expiry_delta = Some(path_last_hop.cltv_expiry_delta);
1076 retry = Some(RouteParameters {
1077 payment_params: params.clone(),
1078 final_value_msat: path_last_hop.fee_msat,
1079 final_cltv_expiry_delta: params.final_cltv_expiry_delta.unwrap(),
1081 } else if let Some(params) = payment_params {
1082 retry = Some(RouteParameters {
1083 payment_params: params.clone(),
1084 final_value_msat: path_last_hop.fee_msat,
1085 final_cltv_expiry_delta:
1086 if let Some(delta) = params.final_cltv_expiry_delta { delta }
1087 else { path_last_hop.cltv_expiry_delta },
1091 if payment_is_probe || !is_retryable_now || !payment_retryable || retry.is_none() {
1092 let _ = payment.get_mut().mark_abandoned(); // we'll only Err if it's a legacy payment
1093 is_retryable_now = false;
1095 if payment.get().remaining_parts() == 0 {
1096 all_paths_failed = true;
1097 if payment.get().abandoned() {
1098 if !payment_is_probe {
1099 full_failure_ev = Some(events::Event::PaymentFailed {
1100 payment_id: *payment_id,
1101 payment_hash: payment.get().payment_hash().expect("PendingOutboundPayments::RetriesExceeded always has a payment hash set"),
1109 log_trace!(logger, "Received duplicative fail for HTLC with payment_hash {}", log_bytes!(payment_hash.0));
1112 core::mem::drop(outbounds);
1113 log_trace!(logger, "Failing outbound payment HTLC with payment_hash {}", log_bytes!(payment_hash.0));
1115 let path_failure = {
1116 if payment_is_probe {
1117 if !payment_retryable {
1118 events::Event::ProbeSuccessful {
1119 payment_id: *payment_id,
1120 payment_hash: payment_hash.clone(),
1124 events::Event::ProbeFailed {
1125 payment_id: *payment_id,
1126 payment_hash: payment_hash.clone(),
1132 // TODO: If we decided to blame ourselves (or one of our channels) in
1133 // process_onion_failure we should close that channel as it implies our
1134 // next-hop is needlessly blaming us!
1135 if let Some(scid) = short_channel_id {
1136 retry.as_mut().map(|r| r.payment_params.previously_failed_channels.push(scid));
1138 // If we miss abandoning the payment above, we *must* generate an event here or else the
1139 // payment will sit in our outbounds forever.
1140 if attempts_remaining && !already_awaiting_retry {
1141 debug_assert!(full_failure_ev.is_none());
1142 pending_retry_ev = true;
1144 events::Event::PaymentPathFailed {
1145 payment_id: Some(*payment_id),
1146 payment_hash: payment_hash.clone(),
1147 payment_failed_permanently: !payment_retryable,
1154 error_code: onion_error_code,
1156 error_data: onion_error_data
1160 let mut pending_events = pending_events.lock().unwrap();
1161 pending_events.push(path_failure);
1162 if let Some(ev) = full_failure_ev { pending_events.push(ev); }
1166 pub(super) fn abandon_payment(
1167 &self, payment_id: PaymentId, pending_events: &Mutex<Vec<events::Event>>
1169 let mut outbounds = self.pending_outbound_payments.lock().unwrap();
1170 if let hash_map::Entry::Occupied(mut payment) = outbounds.entry(payment_id) {
1171 if let Ok(()) = payment.get_mut().mark_abandoned() {
1172 if payment.get().remaining_parts() == 0 {
1173 pending_events.lock().unwrap().push(events::Event::PaymentFailed {
1175 payment_hash: payment.get().payment_hash().expect("PendingOutboundPayments::RetriesExceeded always has a payment hash set"),
1184 pub fn has_pending_payments(&self) -> bool {
1185 !self.pending_outbound_payments.lock().unwrap().is_empty()
1189 pub fn clear_pending_payments(&self) {
1190 self.pending_outbound_payments.lock().unwrap().clear()
1194 /// Returns whether a payment with the given [`PaymentHash`] and [`PaymentId`] is, in fact, a
1196 pub(super) fn payment_is_probe(payment_hash: &PaymentHash, payment_id: &PaymentId,
1197 probing_cookie_secret: [u8; 32]) -> bool
1199 let target_payment_hash = probing_cookie_from_id(payment_id, probing_cookie_secret);
1200 target_payment_hash == *payment_hash
1203 /// Returns the 'probing cookie' for the given [`PaymentId`].
1204 fn probing_cookie_from_id(payment_id: &PaymentId, probing_cookie_secret: [u8; 32]) -> PaymentHash {
1205 let mut preimage = [0u8; 64];
1206 preimage[..32].copy_from_slice(&probing_cookie_secret);
1207 preimage[32..].copy_from_slice(&payment_id.0);
1208 PaymentHash(Sha256::hash(&preimage).into_inner())
1211 impl_writeable_tlv_based_enum_upgradable!(PendingOutboundPayment,
1213 (0, session_privs, required),
1216 (0, session_privs, required),
1217 (1, payment_hash, option),
1218 (3, timer_ticks_without_htlcs, (default_value, 0)),
1221 (0, session_privs, required),
1222 (1, pending_fee_msat, option),
1223 (2, payment_hash, required),
1224 (3, payment_params, option),
1225 (4, payment_secret, option),
1226 (5, keysend_preimage, option),
1227 (6, total_msat, required),
1228 (8, pending_amt_msat, required),
1229 (10, starting_block_height, required),
1230 (not_written, retry_strategy, (static_value, None)),
1231 (not_written, attempts, (static_value, PaymentAttempts::new())),
1234 (0, session_privs, required),
1235 (2, payment_hash, required),
1241 use bitcoin::blockdata::constants::genesis_block;
1242 use bitcoin::network::constants::Network;
1243 use bitcoin::secp256k1::{PublicKey, Secp256k1, SecretKey};
1245 use crate::ln::PaymentHash;
1246 use crate::ln::channelmanager::{PaymentId, PaymentSendFailure};
1247 use crate::ln::msgs::{ErrorAction, LightningError};
1248 use crate::ln::outbound_payment::{OutboundPayments, Retry};
1249 use crate::routing::gossip::NetworkGraph;
1250 use crate::routing::router::{InFlightHtlcs, PaymentParameters, Route, RouteParameters};
1251 use crate::sync::{Arc, Mutex};
1252 use crate::util::errors::APIError;
1253 use crate::util::test_utils;
1256 #[cfg(feature = "std")]
1257 fn fails_paying_after_expiration() {
1258 do_fails_paying_after_expiration(false);
1259 do_fails_paying_after_expiration(true);
1261 #[cfg(feature = "std")]
1262 fn do_fails_paying_after_expiration(on_retry: bool) {
1263 let outbound_payments = OutboundPayments::new();
1264 let logger = test_utils::TestLogger::new();
1265 let genesis_hash = genesis_block(Network::Testnet).header.block_hash();
1266 let network_graph = Arc::new(NetworkGraph::new(genesis_hash, &logger));
1267 let scorer = Mutex::new(test_utils::TestScorer::new());
1268 let router = test_utils::TestRouter::new(network_graph, &scorer);
1269 let secp_ctx = Secp256k1::new();
1270 let keys_manager = test_utils::TestKeysInterface::new(&[0; 32], Network::Testnet);
1272 let past_expiry_time = std::time::SystemTime::UNIX_EPOCH.elapsed().unwrap().as_secs() - 2;
1273 let payment_params = PaymentParameters::from_node_id(
1274 PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap()),
1276 ).with_expiry_time(past_expiry_time);
1277 let expired_route_params = RouteParameters {
1279 final_value_msat: 0,
1280 final_cltv_expiry_delta: 0,
1282 let pending_events = Mutex::new(Vec::new());
1283 let err = if on_retry {
1284 outbound_payments.pay_internal(
1285 PaymentId([0; 32]), PaymentHash([0; 32]), None, expired_route_params, &&router, vec![],
1286 &|| InFlightHtlcs::new(), &&keys_manager, &&keys_manager, 0, &&logger, &pending_events,
1287 &|_, _, _, _, _, _, _, _, _| Ok(())).unwrap_err()
1289 outbound_payments.send_payment(
1290 PaymentHash([0; 32]), &None, PaymentId([0; 32]), Retry::Attempts(0), expired_route_params,
1291 &&router, vec![], || InFlightHtlcs::new(), &&keys_manager, &&keys_manager, 0, &&logger,
1292 &pending_events, |_, _, _, _, _, _, _, _, _| Ok(())).unwrap_err()
1294 if let PaymentSendFailure::ParameterError(APIError::APIMisuseError { err }) = err {
1295 assert!(err.contains("Invoice expired"));
1296 } else { panic!("Unexpected error"); }
1300 fn find_route_error() {
1301 do_find_route_error(false);
1302 do_find_route_error(true);
1304 fn do_find_route_error(on_retry: bool) {
1305 let outbound_payments = OutboundPayments::new();
1306 let logger = test_utils::TestLogger::new();
1307 let genesis_hash = genesis_block(Network::Testnet).header.block_hash();
1308 let network_graph = Arc::new(NetworkGraph::new(genesis_hash, &logger));
1309 let scorer = Mutex::new(test_utils::TestScorer::new());
1310 let router = test_utils::TestRouter::new(network_graph, &scorer);
1311 let secp_ctx = Secp256k1::new();
1312 let keys_manager = test_utils::TestKeysInterface::new(&[0; 32], Network::Testnet);
1314 let payment_params = PaymentParameters::from_node_id(
1315 PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap()), 0);
1316 let route_params = RouteParameters {
1318 final_value_msat: 0,
1319 final_cltv_expiry_delta: 0,
1321 router.expect_find_route(route_params.clone(),
1322 Err(LightningError { err: String::new(), action: ErrorAction::IgnoreError }));
1324 let pending_events = Mutex::new(Vec::new());
1325 let err = if on_retry {
1326 outbound_payments.add_new_pending_payment(PaymentHash([0; 32]), None, PaymentId([0; 32]), None,
1327 &Route { paths: vec![], payment_params: None }, Some(Retry::Attempts(1)),
1328 Some(route_params.payment_params.clone()), &&keys_manager, 0).unwrap();
1329 outbound_payments.pay_internal(
1330 PaymentId([0; 32]), PaymentHash([0; 32]), None, route_params, &&router, vec![],
1331 &|| InFlightHtlcs::new(), &&keys_manager, &&keys_manager, 0, &&logger, &pending_events,
1332 &|_, _, _, _, _, _, _, _, _| Ok(())).unwrap_err()
1334 outbound_payments.send_payment(
1335 PaymentHash([0; 32]), &None, PaymentId([0; 32]), Retry::Attempts(0), route_params,
1336 &&router, vec![], || InFlightHtlcs::new(), &&keys_manager, &&keys_manager, 0, &&logger,
1337 &pending_events, |_, _, _, _, _, _, _, _, _| Ok(())).unwrap_err()
1339 if let PaymentSendFailure::ParameterError(APIError::APIMisuseError { err }) = err {
1340 assert!(err.contains("Failed to find a route"));
1341 } else { panic!("Unexpected error"); }