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};
18 use crate::ln::{PaymentHash, PaymentPreimage, PaymentSecret};
19 use crate::ln::channelmanager::{ChannelDetails, HTLCSource, IDEMPOTENCY_TIMEOUT_TICKS, PaymentId};
20 use crate::ln::onion_utils::HTLCFailReason;
21 use crate::routing::router::{InFlightHtlcs, PaymentParameters, Route, RouteHop, RouteParameters, RoutePath, Router};
22 use crate::util::errors::APIError;
23 use crate::util::logger::Logger;
24 use crate::util::time::Time;
25 #[cfg(all(not(feature = "no-std"), test))]
26 use crate::util::time::tests::SinceEpoch;
27 use crate::util::ser::ReadableArgs;
30 use core::fmt::{self, Display, Formatter};
33 use crate::prelude::*;
34 use crate::sync::Mutex;
36 /// Stores the session_priv for each part of a payment that is still pending. For versions 0.0.102
37 /// and later, also stores information for retrying the payment.
38 pub(crate) enum PendingOutboundPayment {
40 session_privs: HashSet<[u8; 32]>,
43 retry_strategy: Option<Retry>,
44 attempts: PaymentAttempts,
45 payment_params: Option<PaymentParameters>,
46 session_privs: HashSet<[u8; 32]>,
47 payment_hash: PaymentHash,
48 payment_secret: Option<PaymentSecret>,
49 keysend_preimage: Option<PaymentPreimage>,
50 pending_amt_msat: u64,
51 /// Used to track the fee paid. Only present if the payment was serialized on 0.0.103+.
52 pending_fee_msat: Option<u64>,
53 /// The total payment amount across all paths, used to verify that a retry is not overpaying.
55 /// Our best known block height at the time this payment was initiated.
56 starting_block_height: u32,
58 /// When a pending payment is fulfilled, we continue tracking it until all pending HTLCs have
59 /// been resolved. This ensures we don't look up pending payments in ChannelMonitors on restart
60 /// and add a pending payment that was already fulfilled.
62 session_privs: HashSet<[u8; 32]>,
63 payment_hash: Option<PaymentHash>,
64 timer_ticks_without_htlcs: u8,
66 /// When we've decided to give up retrying a payment, we mark it as abandoned so we can eventually
67 /// generate a `PaymentFailed` event when all HTLCs have irrevocably failed.
69 session_privs: HashSet<[u8; 32]>,
70 payment_hash: PaymentHash,
74 impl PendingOutboundPayment {
75 fn increment_attempts(&mut self) {
76 if let PendingOutboundPayment::Retryable { attempts, .. } = self {
80 fn is_auto_retryable_now(&self) -> bool {
82 PendingOutboundPayment::Retryable {
83 retry_strategy: Some(strategy), attempts, payment_params: Some(_), ..
85 strategy.is_retryable_now(&attempts)
90 fn is_retryable_now(&self) -> bool {
92 PendingOutboundPayment::Retryable { retry_strategy: None, .. } => {
93 // We're handling retries manually, we can always retry.
96 PendingOutboundPayment::Retryable { retry_strategy: Some(strategy), attempts, .. } => {
97 strategy.is_retryable_now(&attempts)
102 pub fn insert_previously_failed_scid(&mut self, scid: u64) {
103 if let PendingOutboundPayment::Retryable { payment_params: Some(params), .. } = self {
104 params.previously_failed_channels.push(scid);
107 pub(super) fn is_fulfilled(&self) -> bool {
109 PendingOutboundPayment::Fulfilled { .. } => true,
113 pub(super) fn abandoned(&self) -> bool {
115 PendingOutboundPayment::Abandoned { .. } => true,
119 fn get_pending_fee_msat(&self) -> Option<u64> {
121 PendingOutboundPayment::Retryable { pending_fee_msat, .. } => pending_fee_msat.clone(),
126 fn payment_hash(&self) -> Option<PaymentHash> {
128 PendingOutboundPayment::Legacy { .. } => None,
129 PendingOutboundPayment::Retryable { payment_hash, .. } => Some(*payment_hash),
130 PendingOutboundPayment::Fulfilled { payment_hash, .. } => *payment_hash,
131 PendingOutboundPayment::Abandoned { payment_hash, .. } => Some(*payment_hash),
135 fn mark_fulfilled(&mut self) {
136 let mut session_privs = HashSet::new();
137 core::mem::swap(&mut session_privs, match self {
138 PendingOutboundPayment::Legacy { session_privs } |
139 PendingOutboundPayment::Retryable { session_privs, .. } |
140 PendingOutboundPayment::Fulfilled { session_privs, .. } |
141 PendingOutboundPayment::Abandoned { session_privs, .. }
144 let payment_hash = self.payment_hash();
145 *self = PendingOutboundPayment::Fulfilled { session_privs, payment_hash, timer_ticks_without_htlcs: 0 };
148 fn mark_abandoned(&mut self) -> Result<(), ()> {
149 let mut session_privs = HashSet::new();
150 let our_payment_hash;
151 core::mem::swap(&mut session_privs, match self {
152 PendingOutboundPayment::Legacy { .. } |
153 PendingOutboundPayment::Fulfilled { .. } =>
155 PendingOutboundPayment::Retryable { session_privs, payment_hash, .. } |
156 PendingOutboundPayment::Abandoned { session_privs, payment_hash, .. } => {
157 our_payment_hash = *payment_hash;
161 *self = PendingOutboundPayment::Abandoned { session_privs, payment_hash: our_payment_hash };
165 /// panics if path is None and !self.is_fulfilled
166 fn remove(&mut self, session_priv: &[u8; 32], path: Option<&Vec<RouteHop>>) -> bool {
167 let remove_res = match self {
168 PendingOutboundPayment::Legacy { session_privs } |
169 PendingOutboundPayment::Retryable { session_privs, .. } |
170 PendingOutboundPayment::Fulfilled { session_privs, .. } |
171 PendingOutboundPayment::Abandoned { session_privs, .. } => {
172 session_privs.remove(session_priv)
176 if let PendingOutboundPayment::Retryable { ref mut pending_amt_msat, ref mut pending_fee_msat, .. } = self {
177 let path = path.expect("Fulfilling a payment should always come with a path");
178 let path_last_hop = path.last().expect("Outbound payments must have had a valid path");
179 *pending_amt_msat -= path_last_hop.fee_msat;
180 if let Some(fee_msat) = pending_fee_msat.as_mut() {
181 *fee_msat -= path.get_path_fees();
188 pub(super) fn insert(&mut self, session_priv: [u8; 32], path: &Vec<RouteHop>) -> bool {
189 let insert_res = match self {
190 PendingOutboundPayment::Legacy { session_privs } |
191 PendingOutboundPayment::Retryable { session_privs, .. } => {
192 session_privs.insert(session_priv)
194 PendingOutboundPayment::Fulfilled { .. } => false,
195 PendingOutboundPayment::Abandoned { .. } => false,
198 if let PendingOutboundPayment::Retryable { ref mut pending_amt_msat, ref mut pending_fee_msat, .. } = self {
199 let path_last_hop = path.last().expect("Outbound payments must have had a valid path");
200 *pending_amt_msat += path_last_hop.fee_msat;
201 if let Some(fee_msat) = pending_fee_msat.as_mut() {
202 *fee_msat += path.get_path_fees();
209 pub(super) fn remaining_parts(&self) -> usize {
211 PendingOutboundPayment::Legacy { session_privs } |
212 PendingOutboundPayment::Retryable { session_privs, .. } |
213 PendingOutboundPayment::Fulfilled { session_privs, .. } |
214 PendingOutboundPayment::Abandoned { session_privs, .. } => {
221 /// Strategies available to retry payment path failures.
222 #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
224 /// Max number of attempts to retry payment.
226 /// Each attempt may be multiple HTLCs along multiple paths if the router decides to split up a
227 /// retry, and may retry multiple failed HTLCs at once if they failed around the same time and
228 /// were retried along a route from a single call to [`Router::find_route_with_id`].
230 #[cfg(not(feature = "no-std"))]
231 /// Time elapsed before abandoning retries for a payment. At least one attempt at payment is made;
232 /// see [`PaymentParameters::expiry_time`] to avoid any attempt at payment after a specific time.
234 /// [`PaymentParameters::expiry_time`]: crate::routing::router::PaymentParameters::expiry_time
235 Timeout(core::time::Duration),
239 pub(crate) fn is_retryable_now(&self, attempts: &PaymentAttempts) -> bool {
240 match (self, attempts) {
241 (Retry::Attempts(max_retry_count), PaymentAttempts { count, .. }) => {
242 max_retry_count > count
244 #[cfg(all(not(feature = "no-std"), not(test)))]
245 (Retry::Timeout(max_duration), PaymentAttempts { first_attempted_at, .. }) =>
246 *max_duration >= std::time::Instant::now().duration_since(*first_attempted_at),
247 #[cfg(all(not(feature = "no-std"), test))]
248 (Retry::Timeout(max_duration), PaymentAttempts { first_attempted_at, .. }) =>
249 *max_duration >= SinceEpoch::now().duration_since(*first_attempted_at),
254 #[cfg(feature = "std")]
255 pub(super) fn has_expired(route_params: &RouteParameters) -> bool {
256 if let Some(expiry_time) = route_params.payment_params.expiry_time {
257 if let Ok(elapsed) = std::time::SystemTime::UNIX_EPOCH.elapsed() {
258 return elapsed > core::time::Duration::from_secs(expiry_time)
264 pub(crate) type PaymentAttempts = PaymentAttemptsUsingTime<ConfiguredTime>;
266 /// Storing minimal payment attempts information required for determining if a outbound payment can
268 pub(crate) struct PaymentAttemptsUsingTime<T: Time> {
269 /// This count will be incremented only after the result of the attempt is known. When it's 0,
270 /// it means the result of the first attempt is not known yet.
271 pub(crate) count: usize,
272 /// This field is only used when retry is `Retry::Timeout` which is only build with feature std
273 #[cfg(not(feature = "no-std"))]
274 first_attempted_at: T,
275 #[cfg(feature = "no-std")]
276 phantom: core::marker::PhantomData<T>,
280 #[cfg(not(any(feature = "no-std", test)))]
281 type ConfiguredTime = std::time::Instant;
282 #[cfg(feature = "no-std")]
283 type ConfiguredTime = crate::util::time::Eternity;
284 #[cfg(all(not(feature = "no-std"), test))]
285 type ConfiguredTime = SinceEpoch;
287 impl<T: Time> PaymentAttemptsUsingTime<T> {
288 pub(crate) fn new() -> Self {
289 PaymentAttemptsUsingTime {
291 #[cfg(not(feature = "no-std"))]
292 first_attempted_at: T::now(),
293 #[cfg(feature = "no-std")]
294 phantom: core::marker::PhantomData,
299 impl<T: Time> Display for PaymentAttemptsUsingTime<T> {
300 fn fmt(&self, f: &mut Formatter) -> Result<(), fmt::Error> {
301 #[cfg(feature = "no-std")]
302 return write!(f, "attempts: {}", self.count);
303 #[cfg(not(feature = "no-std"))]
306 "attempts: {}, duration: {}s",
308 T::now().duration_since(self.first_attempted_at).as_secs()
313 /// Indicates an immediate error on [`ChannelManager::send_payment`]. Further errors may be
314 /// surfaced later via [`Event::PaymentPathFailed`] and [`Event::PaymentFailed`].
316 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
317 /// [`Event::PaymentPathFailed`]: crate::events::Event::PaymentPathFailed
318 /// [`Event::PaymentFailed`]: crate::events::Event::PaymentFailed
319 #[derive(Clone, Debug)]
320 pub enum RetryableSendFailure {
321 /// The provided [`PaymentParameters::expiry_time`] indicated that the payment has expired. Note
322 /// that this error is *not* caused by [`Retry::Timeout`].
324 /// [`PaymentParameters::expiry_time`]: crate::routing::router::PaymentParameters::expiry_time
326 /// We were unable to find a route to the destination.
328 /// Indicates that a payment for the provided [`PaymentId`] is already in-flight and has not
329 /// yet completed (i.e. generated an [`Event::PaymentSent`] or [`Event::PaymentFailed`]).
331 /// [`PaymentId`]: crate::ln::channelmanager::PaymentId
332 /// [`Event::PaymentSent`]: crate::events::Event::PaymentSent
333 /// [`Event::PaymentFailed`]: crate::events::Event::PaymentFailed
337 /// If a payment fails to send with [`ChannelManager::send_payment_with_route`], it can be in one
338 /// of several states. This enum is returned as the Err() type describing which state the payment
339 /// is in, see the description of individual enum states for more.
341 /// [`ChannelManager::send_payment_with_route`]: crate::ln::channelmanager::ChannelManager::send_payment_with_route
342 #[derive(Clone, Debug)]
343 pub enum PaymentSendFailure {
344 /// A parameter which was passed to send_payment was invalid, preventing us from attempting to
345 /// send the payment at all.
347 /// You can freely resend the payment in full (with the parameter error fixed).
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::events::Event::PaymentPathFailed
353 /// [`Event::PaymentFailed`]: crate::events::Event::PaymentFailed
354 ParameterError(APIError),
355 /// A parameter in a single path which was passed to send_payment was invalid, preventing us
356 /// from attempting to send the payment at all.
358 /// You can freely resend the payment in full (with the parameter error fixed).
360 /// Because the payment failed outright, no payment tracking is done and no
361 /// [`Event::PaymentPathFailed`] or [`Event::PaymentFailed`] events will be generated.
363 /// The results here are ordered the same as the paths in the route object which was passed to
366 /// [`Event::PaymentPathFailed`]: crate::events::Event::PaymentPathFailed
367 /// [`Event::PaymentFailed`]: crate::events::Event::PaymentFailed
368 PathParameterError(Vec<Result<(), APIError>>),
369 /// All paths which were attempted failed to send, with no channel state change taking place.
370 /// You can freely resend the payment in full (though you probably want to do so over different
371 /// paths than the ones selected).
373 /// Because the payment failed outright, no payment tracking is done and no
374 /// [`Event::PaymentPathFailed`] or [`Event::PaymentFailed`] events will be generated.
376 /// [`Event::PaymentPathFailed`]: crate::events::Event::PaymentPathFailed
377 /// [`Event::PaymentFailed`]: crate::events::Event::PaymentFailed
378 AllFailedResendSafe(Vec<APIError>),
379 /// Indicates that a payment for the provided [`PaymentId`] is already in-flight and has not
380 /// yet completed (i.e. generated an [`Event::PaymentSent`] or [`Event::PaymentFailed`]).
382 /// [`PaymentId`]: crate::ln::channelmanager::PaymentId
383 /// [`Event::PaymentSent`]: crate::events::Event::PaymentSent
384 /// [`Event::PaymentFailed`]: crate::events::Event::PaymentFailed
386 /// Some paths that were attempted failed to send, though some paths may have succeeded. At least
387 /// some paths have irrevocably committed to the HTLC.
389 /// The results here are ordered the same as the paths in the route object that was passed to
392 /// Any entries that contain `Err(APIError::MonitorUpdateInprogress)` will send once a
393 /// [`MonitorEvent::Completed`] is provided for the next-hop channel with the latest update_id.
395 /// [`MonitorEvent::Completed`]: crate::chain::channelmonitor::MonitorEvent::Completed
397 /// The errors themselves, in the same order as the paths from the route.
398 results: Vec<Result<(), APIError>>,
399 /// If some paths failed without irrevocably committing to the new HTLC(s), this will
400 /// contain a [`RouteParameters`] object for the failing paths.
401 failed_paths_retry: Option<RouteParameters>,
402 /// The payment id for the payment, which is now at least partially pending.
403 payment_id: PaymentId,
407 /// Information which is provided, encrypted, to the payment recipient when sending HTLCs.
409 /// This should generally be constructed with data communicated to us from the recipient (via a
410 /// BOLT11 or BOLT12 invoice).
412 pub struct RecipientOnionFields {
413 /// The [`PaymentSecret`] is an arbitrary 32 bytes provided by the recipient for us to repeat
414 /// in the onion. It is unrelated to `payment_hash` (or [`PaymentPreimage`]) and exists to
415 /// authenticate the sender to the recipient and prevent payment-probing (deanonymization)
418 /// If you do not have one, the [`Route`] you pay over must not contain multiple paths as
419 /// multi-path payments require a recipient-provided secret.
421 /// Note that for spontaneous payments most lightning nodes do not currently support MPP
422 /// receives, thus you should generally never be providing a secret here for spontaneous
424 pub payment_secret: Option<PaymentSecret>,
427 impl RecipientOnionFields {
428 /// Creates a [`RecipientOnionFields`] from only a [`PaymentSecret`]. This is the most common
429 /// set of onion fields for today's BOLT11 invoices - most nodes require a [`PaymentSecret`]
430 /// but do not require or provide any further data.
431 pub fn secret_only(payment_secret: PaymentSecret) -> Self {
432 Self { payment_secret: Some(payment_secret) }
435 /// Creates a new [`RecipientOnionFields`] with no fields. This generally does not create
436 /// payable HTLCs except for spontaneous payments, i.e. this should generally only be used for
437 /// calls to [`ChannelManager::send_spontaneous_payment`].
439 /// [`ChannelManager::send_spontaneous_payment`]: super::channelmanager::ChannelManager::send_spontaneous_payment
440 pub fn spontaneous_empty() -> Self {
441 Self { payment_secret: None }
445 pub(super) struct OutboundPayments {
446 pub(super) pending_outbound_payments: Mutex<HashMap<PaymentId, PendingOutboundPayment>>,
447 pub(super) retry_lock: Mutex<()>,
450 impl OutboundPayments {
451 pub(super) fn new() -> Self {
453 pending_outbound_payments: Mutex::new(HashMap::new()),
454 retry_lock: Mutex::new(()),
458 pub(super) fn send_payment<R: Deref, ES: Deref, NS: Deref, IH, SP, L: Deref>(
459 &self, payment_hash: PaymentHash, recipient_onion: RecipientOnionFields, payment_id: PaymentId,
460 retry_strategy: Retry, route_params: RouteParameters, router: &R,
461 first_hops: Vec<ChannelDetails>, compute_inflight_htlcs: IH, entropy_source: &ES,
462 node_signer: &NS, best_block_height: u32, logger: &L,
463 pending_events: &Mutex<Vec<events::Event>>, send_payment_along_path: SP,
464 ) -> Result<(), RetryableSendFailure>
467 ES::Target: EntropySource,
468 NS::Target: NodeSigner,
470 IH: Fn() -> InFlightHtlcs,
471 SP: Fn(&Vec<RouteHop>, &PaymentHash, RecipientOnionFields, u64, u32, PaymentId,
472 &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>,
474 self.send_payment_internal(payment_id, payment_hash, recipient_onion, None, retry_strategy,
475 route_params, router, first_hops, &compute_inflight_htlcs, entropy_source, node_signer,
476 best_block_height, logger, pending_events, &send_payment_along_path)
479 pub(super) fn send_payment_with_route<ES: Deref, NS: Deref, F>(
480 &self, route: &Route, payment_hash: PaymentHash, recipient_onion: RecipientOnionFields,
481 payment_id: PaymentId, entropy_source: &ES, node_signer: &NS, best_block_height: u32,
482 send_payment_along_path: F
483 ) -> Result<(), PaymentSendFailure>
485 ES::Target: EntropySource,
486 NS::Target: NodeSigner,
487 F: Fn(&Vec<RouteHop>, &PaymentHash, RecipientOnionFields, u64, u32, PaymentId,
488 &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
490 let onion_session_privs = self.add_new_pending_payment(payment_hash, recipient_onion.clone(), payment_id, None, route, None, None, entropy_source, best_block_height)?;
491 self.pay_route_internal(route, payment_hash, recipient_onion, None, payment_id, None,
492 onion_session_privs, node_signer, best_block_height, &send_payment_along_path)
493 .map_err(|e| { self.remove_outbound_if_all_failed(payment_id, &e); e })
496 pub(super) fn send_spontaneous_payment<R: Deref, ES: Deref, NS: Deref, IH, SP, L: Deref>(
497 &self, payment_preimage: Option<PaymentPreimage>, recipient_onion: RecipientOnionFields,
498 payment_id: PaymentId, retry_strategy: Retry, route_params: RouteParameters, router: &R,
499 first_hops: Vec<ChannelDetails>, inflight_htlcs: IH, entropy_source: &ES,
500 node_signer: &NS, best_block_height: u32, logger: &L,
501 pending_events: &Mutex<Vec<events::Event>>, send_payment_along_path: SP
502 ) -> Result<PaymentHash, RetryableSendFailure>
505 ES::Target: EntropySource,
506 NS::Target: NodeSigner,
508 IH: Fn() -> InFlightHtlcs,
509 SP: Fn(&Vec<RouteHop>, &PaymentHash, RecipientOnionFields, u64, u32, PaymentId,
510 &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>,
512 let preimage = payment_preimage
513 .unwrap_or_else(|| PaymentPreimage(entropy_source.get_secure_random_bytes()));
514 let payment_hash = PaymentHash(Sha256::hash(&preimage.0).into_inner());
515 self.send_payment_internal(payment_id, payment_hash, recipient_onion, Some(preimage),
516 retry_strategy, route_params, router, first_hops, inflight_htlcs, entropy_source,
517 node_signer, best_block_height, logger, pending_events, send_payment_along_path)
518 .map(|()| payment_hash)
521 pub(super) fn send_spontaneous_payment_with_route<ES: Deref, NS: Deref, F>(
522 &self, route: &Route, payment_preimage: Option<PaymentPreimage>,
523 recipient_onion: RecipientOnionFields, payment_id: PaymentId, entropy_source: &ES,
524 node_signer: &NS, best_block_height: u32, send_payment_along_path: F
525 ) -> Result<PaymentHash, PaymentSendFailure>
527 ES::Target: EntropySource,
528 NS::Target: NodeSigner,
529 F: Fn(&Vec<RouteHop>, &PaymentHash, RecipientOnionFields, u64, u32, PaymentId,
530 &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
532 let preimage = payment_preimage
533 .unwrap_or_else(|| PaymentPreimage(entropy_source.get_secure_random_bytes()));
534 let payment_hash = PaymentHash(Sha256::hash(&preimage.0).into_inner());
535 let onion_session_privs = self.add_new_pending_payment(payment_hash, recipient_onion.clone(),
536 payment_id, Some(preimage), &route, None, None, entropy_source, best_block_height)?;
538 match self.pay_route_internal(route, payment_hash, recipient_onion, Some(preimage),
539 payment_id, None, onion_session_privs, node_signer, best_block_height, &send_payment_along_path
541 Ok(()) => Ok(payment_hash),
543 self.remove_outbound_if_all_failed(payment_id, &e);
549 pub(super) fn check_retry_payments<R: Deref, ES: Deref, NS: Deref, SP, IH, FH, L: Deref>(
550 &self, router: &R, first_hops: FH, inflight_htlcs: IH, entropy_source: &ES, node_signer: &NS,
551 best_block_height: u32, pending_events: &Mutex<Vec<events::Event>>, logger: &L,
552 send_payment_along_path: SP,
556 ES::Target: EntropySource,
557 NS::Target: NodeSigner,
558 SP: Fn(&Vec<RouteHop>, &PaymentHash, RecipientOnionFields, u64, u32, PaymentId,
559 &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>,
560 IH: Fn() -> InFlightHtlcs,
561 FH: Fn() -> Vec<ChannelDetails>,
564 let _single_thread = self.retry_lock.lock().unwrap();
566 let mut outbounds = self.pending_outbound_payments.lock().unwrap();
567 let mut retry_id_route_params = None;
568 for (pmt_id, pmt) in outbounds.iter_mut() {
569 if pmt.is_auto_retryable_now() {
570 if let PendingOutboundPayment::Retryable { pending_amt_msat, total_msat, payment_params: Some(params), payment_hash, .. } = pmt {
571 if pending_amt_msat < total_msat {
572 retry_id_route_params = Some((*payment_hash, *pmt_id, RouteParameters {
573 final_value_msat: *total_msat - *pending_amt_msat,
574 payment_params: params.clone(),
578 } else { debug_assert!(false); }
581 core::mem::drop(outbounds);
582 if let Some((payment_hash, payment_id, route_params)) = retry_id_route_params {
583 self.retry_payment_internal(payment_hash, payment_id, route_params, router, first_hops(), &inflight_htlcs, entropy_source, node_signer, best_block_height, logger, pending_events, &send_payment_along_path)
587 let mut outbounds = self.pending_outbound_payments.lock().unwrap();
588 outbounds.retain(|pmt_id, pmt| {
589 let mut retain = true;
590 if !pmt.is_auto_retryable_now() && pmt.remaining_parts() == 0 {
591 if pmt.mark_abandoned().is_ok() {
592 pending_events.lock().unwrap().push(events::Event::PaymentFailed {
594 payment_hash: pmt.payment_hash().expect("PendingOutboundPayments::Retryable always has a payment hash set"),
603 pub(super) fn needs_abandon(&self) -> bool {
604 let outbounds = self.pending_outbound_payments.lock().unwrap();
605 outbounds.iter().any(|(_, pmt)|
606 !pmt.is_auto_retryable_now() && pmt.remaining_parts() == 0 && !pmt.is_fulfilled())
609 /// Errors immediately on [`RetryableSendFailure`] error conditions. Otherwise, further errors may
610 /// be surfaced asynchronously via [`Event::PaymentPathFailed`] and [`Event::PaymentFailed`].
612 /// [`Event::PaymentPathFailed`]: crate::events::Event::PaymentPathFailed
613 /// [`Event::PaymentFailed`]: crate::events::Event::PaymentFailed
614 fn send_payment_internal<R: Deref, NS: Deref, ES: Deref, IH, SP, L: Deref>(
615 &self, payment_id: PaymentId, payment_hash: PaymentHash, recipient_onion: RecipientOnionFields,
616 keysend_preimage: Option<PaymentPreimage>, retry_strategy: Retry, route_params: RouteParameters,
617 router: &R, first_hops: Vec<ChannelDetails>, inflight_htlcs: IH, entropy_source: &ES,
618 node_signer: &NS, best_block_height: u32, logger: &L,
619 pending_events: &Mutex<Vec<events::Event>>, send_payment_along_path: SP,
620 ) -> Result<(), RetryableSendFailure>
623 ES::Target: EntropySource,
624 NS::Target: NodeSigner,
626 IH: Fn() -> InFlightHtlcs,
627 SP: Fn(&Vec<RouteHop>, &PaymentHash, RecipientOnionFields, u64, u32, PaymentId,
628 &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
630 #[cfg(feature = "std")] {
631 if has_expired(&route_params) {
632 return Err(RetryableSendFailure::PaymentExpired)
636 let route = router.find_route_with_id(
637 &node_signer.get_node_id(Recipient::Node).unwrap(), &route_params,
638 Some(&first_hops.iter().collect::<Vec<_>>()), &inflight_htlcs(),
639 payment_hash, payment_id,
640 ).map_err(|_| RetryableSendFailure::RouteNotFound)?;
642 let onion_session_privs = self.add_new_pending_payment(payment_hash,
643 recipient_onion.clone(), payment_id, keysend_preimage, &route, Some(retry_strategy),
644 Some(route_params.payment_params.clone()), entropy_source, best_block_height)
645 .map_err(|_| RetryableSendFailure::DuplicatePayment)?;
647 let res = self.pay_route_internal(&route, payment_hash, recipient_onion, None, payment_id, None,
648 onion_session_privs, node_signer, best_block_height, &send_payment_along_path);
649 log_info!(logger, "Result sending payment with id {}: {:?}", log_bytes!(payment_id.0), res);
650 if let Err(e) = res {
651 self.handle_pay_route_err(e, payment_id, payment_hash, route, route_params, router, first_hops, &inflight_htlcs, entropy_source, node_signer, best_block_height, logger, pending_events, &send_payment_along_path);
656 fn retry_payment_internal<R: Deref, NS: Deref, ES: Deref, IH, SP, L: Deref>(
657 &self, payment_hash: PaymentHash, payment_id: PaymentId, route_params: RouteParameters,
658 router: &R, first_hops: Vec<ChannelDetails>, inflight_htlcs: &IH, entropy_source: &ES,
659 node_signer: &NS, best_block_height: u32, logger: &L,
660 pending_events: &Mutex<Vec<events::Event>>, send_payment_along_path: &SP,
664 ES::Target: EntropySource,
665 NS::Target: NodeSigner,
667 IH: Fn() -> InFlightHtlcs,
668 SP: Fn(&Vec<RouteHop>, &PaymentHash, RecipientOnionFields, u64, u32, PaymentId,
669 &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
671 #[cfg(feature = "std")] {
672 if has_expired(&route_params) {
673 log_error!(logger, "Payment params expired on retry, abandoning payment {}", log_bytes!(payment_id.0));
674 self.abandon_payment(payment_id, pending_events);
679 let route = match router.find_route_with_id(
680 &node_signer.get_node_id(Recipient::Node).unwrap(), &route_params,
681 Some(&first_hops.iter().collect::<Vec<_>>()), &inflight_htlcs(),
682 payment_hash, payment_id,
686 log_error!(logger, "Failed to find a route on retry, abandoning payment {}: {:#?}", log_bytes!(payment_id.0), e);
687 self.abandon_payment(payment_id, pending_events);
691 for path in route.paths.iter() {
693 log_error!(logger, "length-0 path in route");
694 self.abandon_payment(payment_id, pending_events);
699 const RETRY_OVERFLOW_PERCENTAGE: u64 = 10;
700 let mut onion_session_privs = Vec::with_capacity(route.paths.len());
701 for _ in 0..route.paths.len() {
702 onion_session_privs.push(entropy_source.get_secure_random_bytes());
705 macro_rules! abandon_with_entry {
706 ($payment: expr) => {
707 if $payment.get_mut().mark_abandoned().is_ok() && $payment.get().remaining_parts() == 0 {
708 pending_events.lock().unwrap().push(events::Event::PaymentFailed {
716 let (total_msat, recipient_onion, keysend_preimage) = {
717 let mut outbounds = self.pending_outbound_payments.lock().unwrap();
718 match outbounds.entry(payment_id) {
719 hash_map::Entry::Occupied(mut payment) => {
720 let res = match payment.get() {
721 PendingOutboundPayment::Retryable {
722 total_msat, keysend_preimage, payment_secret, pending_amt_msat, ..
724 let retry_amt_msat: u64 = route.paths.iter().map(|path| path.last().unwrap().fee_msat).sum();
725 if retry_amt_msat + *pending_amt_msat > *total_msat * (100 + RETRY_OVERFLOW_PERCENTAGE) / 100 {
726 log_error!(logger, "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);
727 abandon_with_entry!(payment);
730 (*total_msat, RecipientOnionFields {
731 payment_secret: *payment_secret,
732 }, *keysend_preimage)
734 PendingOutboundPayment::Legacy { .. } => {
735 log_error!(logger, "Unable to retry payments that were initially sent on LDK versions prior to 0.0.102");
738 PendingOutboundPayment::Fulfilled { .. } => {
739 log_error!(logger, "Payment already completed");
742 PendingOutboundPayment::Abandoned { .. } => {
743 log_error!(logger, "Payment already abandoned (with some HTLCs still pending)");
747 if !payment.get().is_retryable_now() {
748 log_error!(logger, "Retries exhausted for payment id {}", log_bytes!(payment_id.0));
749 abandon_with_entry!(payment);
752 payment.get_mut().increment_attempts();
753 for (path, session_priv_bytes) in route.paths.iter().zip(onion_session_privs.iter()) {
754 assert!(payment.get_mut().insert(*session_priv_bytes, path));
758 hash_map::Entry::Vacant(_) => {
759 log_error!(logger, "Payment with ID {} not found", log_bytes!(payment_id.0));
764 let res = self.pay_route_internal(&route, payment_hash, recipient_onion, keysend_preimage,
765 payment_id, Some(total_msat), onion_session_privs, node_signer, best_block_height,
766 &send_payment_along_path);
767 log_info!(logger, "Result retrying payment id {}: {:?}", log_bytes!(payment_id.0), res);
768 if let Err(e) = res {
769 self.handle_pay_route_err(e, payment_id, payment_hash, route, route_params, router, first_hops, inflight_htlcs, entropy_source, node_signer, best_block_height, logger, pending_events, send_payment_along_path);
773 fn handle_pay_route_err<R: Deref, NS: Deref, ES: Deref, IH, SP, L: Deref>(
774 &self, err: PaymentSendFailure, payment_id: PaymentId, payment_hash: PaymentHash, route: Route,
775 mut route_params: RouteParameters, router: &R, first_hops: Vec<ChannelDetails>,
776 inflight_htlcs: &IH, entropy_source: &ES, node_signer: &NS, best_block_height: u32, logger: &L,
777 pending_events: &Mutex<Vec<events::Event>>, send_payment_along_path: &SP,
781 ES::Target: EntropySource,
782 NS::Target: NodeSigner,
784 IH: Fn() -> InFlightHtlcs,
785 SP: Fn(&Vec<RouteHop>, &PaymentHash, RecipientOnionFields, u64, u32, PaymentId,
786 &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
789 PaymentSendFailure::AllFailedResendSafe(errs) => {
790 Self::push_path_failed_evs_and_scids(payment_id, payment_hash, &mut route_params, route.paths, errs.into_iter().map(|e| Err(e)), pending_events);
791 self.retry_payment_internal(payment_hash, payment_id, route_params, router, first_hops, inflight_htlcs, entropy_source, node_signer, best_block_height, logger, pending_events, send_payment_along_path);
793 PaymentSendFailure::PartialFailure { failed_paths_retry: Some(mut retry), results, .. } => {
794 Self::push_path_failed_evs_and_scids(payment_id, payment_hash, &mut retry, route.paths, results.into_iter(), pending_events);
795 // Some paths were sent, even if we failed to send the full MPP value our recipient may
796 // misbehave and claim the funds, at which point we have to consider the payment sent, so
797 // return `Ok()` here, ignoring any retry errors.
798 self.retry_payment_internal(payment_hash, payment_id, retry, router, first_hops, inflight_htlcs, entropy_source, node_signer, best_block_height, logger, pending_events, send_payment_along_path);
800 PaymentSendFailure::PartialFailure { failed_paths_retry: None, .. } => {
801 // This may happen if we send a payment and some paths fail, but only due to a temporary
802 // monitor failure or the like, implying they're really in-flight, but we haven't sent the
803 // initial HTLC-Add messages yet.
805 PaymentSendFailure::PathParameterError(results) => {
806 Self::push_path_failed_evs_and_scids(payment_id, payment_hash, &mut route_params, route.paths, results.into_iter(), pending_events);
807 self.abandon_payment(payment_id, pending_events);
809 PaymentSendFailure::ParameterError(e) => {
810 log_error!(logger, "Failed to send to route due to parameter error: {:?}. Your router is buggy", e);
811 self.abandon_payment(payment_id, pending_events);
813 PaymentSendFailure::DuplicatePayment => debug_assert!(false), // unreachable
817 fn push_path_failed_evs_and_scids<I: ExactSizeIterator + Iterator<Item = Result<(), APIError>>>(
818 payment_id: PaymentId, payment_hash: PaymentHash, route_params: &mut RouteParameters,
819 paths: Vec<Vec<RouteHop>>, path_results: I, pending_events: &Mutex<Vec<events::Event>>
821 let mut events = pending_events.lock().unwrap();
822 debug_assert_eq!(paths.len(), path_results.len());
823 for (path, path_res) in paths.into_iter().zip(path_results) {
824 if let Err(e) = path_res {
825 if let APIError::MonitorUpdateInProgress = e { continue }
826 let mut failed_scid = None;
827 if let APIError::ChannelUnavailable { .. } = e {
828 let scid = path[0].short_channel_id;
829 failed_scid = Some(scid);
830 route_params.payment_params.previously_failed_channels.push(scid);
832 events.push(events::Event::PaymentPathFailed {
833 payment_id: Some(payment_id),
835 payment_failed_permanently: false,
836 failure: events::PathFailure::InitialSend { err: e },
838 short_channel_id: failed_scid,
848 pub(super) fn send_probe<ES: Deref, NS: Deref, F>(
849 &self, hops: Vec<RouteHop>, probing_cookie_secret: [u8; 32], entropy_source: &ES,
850 node_signer: &NS, best_block_height: u32, send_payment_along_path: F
851 ) -> Result<(PaymentHash, PaymentId), PaymentSendFailure>
853 ES::Target: EntropySource,
854 NS::Target: NodeSigner,
855 F: Fn(&Vec<RouteHop>, &PaymentHash, RecipientOnionFields, u64, u32, PaymentId,
856 &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
858 let payment_id = PaymentId(entropy_source.get_secure_random_bytes());
860 let payment_hash = probing_cookie_from_id(&payment_id, probing_cookie_secret);
863 return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
864 err: "No need probing a path with less than two hops".to_string()
868 let route = Route { paths: vec![hops], payment_params: None };
869 let onion_session_privs = self.add_new_pending_payment(payment_hash,
870 RecipientOnionFields::spontaneous_empty(), payment_id, None, &route, None, None,
871 entropy_source, best_block_height)?;
873 match self.pay_route_internal(&route, payment_hash, RecipientOnionFields::spontaneous_empty(),
874 None, payment_id, None, onion_session_privs, node_signer, best_block_height, &send_payment_along_path
876 Ok(()) => Ok((payment_hash, payment_id)),
878 self.remove_outbound_if_all_failed(payment_id, &e);
885 pub(super) fn test_add_new_pending_payment<ES: Deref>(
886 &self, payment_hash: PaymentHash, recipient_onion: RecipientOnionFields, payment_id: PaymentId,
887 route: &Route, retry_strategy: Option<Retry>, entropy_source: &ES, best_block_height: u32
888 ) -> Result<Vec<[u8; 32]>, PaymentSendFailure> where ES::Target: EntropySource {
889 self.add_new_pending_payment(payment_hash, recipient_onion, payment_id, None, route, retry_strategy, None, entropy_source, best_block_height)
892 pub(super) fn add_new_pending_payment<ES: Deref>(
893 &self, payment_hash: PaymentHash, recipient_onion: RecipientOnionFields, payment_id: PaymentId,
894 keysend_preimage: Option<PaymentPreimage>, route: &Route, retry_strategy: Option<Retry>,
895 payment_params: Option<PaymentParameters>, entropy_source: &ES, best_block_height: u32
896 ) -> Result<Vec<[u8; 32]>, PaymentSendFailure> where ES::Target: EntropySource {
897 let mut onion_session_privs = Vec::with_capacity(route.paths.len());
898 for _ in 0..route.paths.len() {
899 onion_session_privs.push(entropy_source.get_secure_random_bytes());
902 let mut pending_outbounds = self.pending_outbound_payments.lock().unwrap();
903 match pending_outbounds.entry(payment_id) {
904 hash_map::Entry::Occupied(_) => Err(PaymentSendFailure::DuplicatePayment),
905 hash_map::Entry::Vacant(entry) => {
906 let payment = entry.insert(PendingOutboundPayment::Retryable {
908 attempts: PaymentAttempts::new(),
910 session_privs: HashSet::new(),
912 pending_fee_msat: Some(0),
914 payment_secret: recipient_onion.payment_secret,
916 starting_block_height: best_block_height,
917 total_msat: route.get_total_amount(),
920 for (path, session_priv_bytes) in route.paths.iter().zip(onion_session_privs.iter()) {
921 assert!(payment.insert(*session_priv_bytes, path));
924 Ok(onion_session_privs)
929 fn pay_route_internal<NS: Deref, F>(
930 &self, route: &Route, payment_hash: PaymentHash, recipient_onion: RecipientOnionFields,
931 keysend_preimage: Option<PaymentPreimage>, payment_id: PaymentId, recv_value_msat: Option<u64>,
932 onion_session_privs: Vec<[u8; 32]>, node_signer: &NS, best_block_height: u32,
933 send_payment_along_path: &F
934 ) -> Result<(), PaymentSendFailure>
936 NS::Target: NodeSigner,
937 F: Fn(&Vec<RouteHop>, &PaymentHash, RecipientOnionFields, u64, u32, PaymentId,
938 &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
940 if route.paths.len() < 1 {
941 return Err(PaymentSendFailure::ParameterError(APIError::InvalidRoute{err: "There must be at least one path to send over".to_owned()}));
943 if recipient_onion.payment_secret.is_none() && route.paths.len() > 1 {
944 return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError{err: "Payment secret is required for multi-path payments".to_owned()}));
946 let mut total_value = 0;
947 let our_node_id = node_signer.get_node_id(Recipient::Node).unwrap(); // TODO no unwrap
948 let mut path_errs = Vec::with_capacity(route.paths.len());
949 'path_check: for path in route.paths.iter() {
950 if path.len() < 1 || path.len() > 20 {
951 path_errs.push(Err(APIError::InvalidRoute{err: "Path didn't go anywhere/had bogus size".to_owned()}));
952 continue 'path_check;
954 for (idx, hop) in path.iter().enumerate() {
955 if idx != path.len() - 1 && hop.pubkey == our_node_id {
956 path_errs.push(Err(APIError::InvalidRoute{err: "Path went through us but wasn't a simple rebalance loop to us".to_owned()}));
957 continue 'path_check;
960 total_value += path.last().unwrap().fee_msat;
961 path_errs.push(Ok(()));
963 if path_errs.iter().any(|e| e.is_err()) {
964 return Err(PaymentSendFailure::PathParameterError(path_errs));
966 if let Some(amt_msat) = recv_value_msat {
967 total_value = amt_msat;
970 let cur_height = best_block_height + 1;
971 let mut results = Vec::new();
972 debug_assert_eq!(route.paths.len(), onion_session_privs.len());
973 for (path, session_priv) in route.paths.iter().zip(onion_session_privs.into_iter()) {
974 let mut path_res = send_payment_along_path(&path, &payment_hash, recipient_onion.clone(),
975 total_value, cur_height, payment_id, &keysend_preimage, session_priv);
978 Err(APIError::MonitorUpdateInProgress) => {
979 // While a MonitorUpdateInProgress is an Err(_), the payment is still
980 // considered "in flight" and we shouldn't remove it from the
981 // PendingOutboundPayment set.
984 let mut pending_outbounds = self.pending_outbound_payments.lock().unwrap();
985 if let Some(payment) = pending_outbounds.get_mut(&payment_id) {
986 let removed = payment.remove(&session_priv, Some(path));
987 debug_assert!(removed, "This can't happen as the payment has an entry for this path added by callers");
989 debug_assert!(false, "This can't happen as the payment was added by callers");
990 path_res = Err(APIError::APIMisuseError { err: "Internal error: payment disappeared during processing. Please report this bug!".to_owned() });
994 results.push(path_res);
996 let mut has_ok = false;
997 let mut has_err = false;
998 let mut pending_amt_unsent = 0;
999 let mut max_unsent_cltv_delta = 0;
1000 for (res, path) in results.iter().zip(route.paths.iter()) {
1001 if res.is_ok() { has_ok = true; }
1002 if res.is_err() { has_err = true; }
1003 if let &Err(APIError::MonitorUpdateInProgress) = res {
1004 // MonitorUpdateInProgress is inherently unsafe to retry, so we call it a
1008 } else if res.is_err() {
1009 pending_amt_unsent += path.last().unwrap().fee_msat;
1010 max_unsent_cltv_delta = cmp::max(max_unsent_cltv_delta, path.last().unwrap().cltv_expiry_delta);
1013 if has_err && has_ok {
1014 Err(PaymentSendFailure::PartialFailure {
1017 failed_paths_retry: if pending_amt_unsent != 0 {
1018 if let Some(payment_params) = &route.payment_params {
1019 Some(RouteParameters {
1020 payment_params: payment_params.clone(),
1021 final_value_msat: pending_amt_unsent,
1027 Err(PaymentSendFailure::AllFailedResendSafe(results.drain(..).map(|r| r.unwrap_err()).collect()))
1034 pub(super) fn test_send_payment_internal<NS: Deref, F>(
1035 &self, route: &Route, payment_hash: PaymentHash, recipient_onion: RecipientOnionFields,
1036 keysend_preimage: Option<PaymentPreimage>, payment_id: PaymentId, recv_value_msat: Option<u64>,
1037 onion_session_privs: Vec<[u8; 32]>, node_signer: &NS, best_block_height: u32,
1038 send_payment_along_path: F
1039 ) -> Result<(), PaymentSendFailure>
1041 NS::Target: NodeSigner,
1042 F: Fn(&Vec<RouteHop>, &PaymentHash, RecipientOnionFields, u64, u32, PaymentId,
1043 &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
1045 self.pay_route_internal(route, payment_hash, recipient_onion, keysend_preimage, payment_id,
1046 recv_value_msat, onion_session_privs, node_signer, best_block_height,
1047 &send_payment_along_path)
1048 .map_err(|e| { self.remove_outbound_if_all_failed(payment_id, &e); e })
1051 // If we failed to send any paths, remove the new PaymentId from the `pending_outbound_payments`
1052 // map as the payment is free to be resent.
1053 fn remove_outbound_if_all_failed(&self, payment_id: PaymentId, err: &PaymentSendFailure) {
1054 if let &PaymentSendFailure::AllFailedResendSafe(_) = err {
1055 let removed = self.pending_outbound_payments.lock().unwrap().remove(&payment_id).is_some();
1056 debug_assert!(removed, "We should always have a pending payment to remove here");
1060 pub(super) fn claim_htlc<L: Deref>(
1061 &self, payment_id: PaymentId, payment_preimage: PaymentPreimage, session_priv: SecretKey,
1062 path: Vec<RouteHop>, from_onchain: bool, pending_events: &Mutex<Vec<events::Event>>, logger: &L
1063 ) where L::Target: Logger {
1064 let mut session_priv_bytes = [0; 32];
1065 session_priv_bytes.copy_from_slice(&session_priv[..]);
1066 let mut outbounds = self.pending_outbound_payments.lock().unwrap();
1067 let mut pending_events = pending_events.lock().unwrap();
1068 if let hash_map::Entry::Occupied(mut payment) = outbounds.entry(payment_id) {
1069 if !payment.get().is_fulfilled() {
1070 let payment_hash = PaymentHash(Sha256::hash(&payment_preimage.0).into_inner());
1071 let fee_paid_msat = payment.get().get_pending_fee_msat();
1072 pending_events.push(
1073 events::Event::PaymentSent {
1074 payment_id: Some(payment_id),
1080 payment.get_mut().mark_fulfilled();
1084 // We currently immediately remove HTLCs which were fulfilled on-chain.
1085 // This could potentially lead to removing a pending payment too early,
1086 // with a reorg of one block causing us to re-add the fulfilled payment on
1088 // TODO: We should have a second monitor event that informs us of payments
1089 // irrevocably fulfilled.
1090 if payment.get_mut().remove(&session_priv_bytes, Some(&path)) {
1091 let payment_hash = Some(PaymentHash(Sha256::hash(&payment_preimage.0).into_inner()));
1092 pending_events.push(
1093 events::Event::PaymentPathSuccessful {
1102 log_trace!(logger, "Received duplicative fulfill for HTLC with payment_preimage {}", log_bytes!(payment_preimage.0));
1106 pub(super) fn finalize_claims(&self, sources: Vec<HTLCSource>, pending_events: &Mutex<Vec<events::Event>>) {
1107 let mut outbounds = self.pending_outbound_payments.lock().unwrap();
1108 let mut pending_events = pending_events.lock().unwrap();
1109 for source in sources {
1110 if let HTLCSource::OutboundRoute { session_priv, payment_id, path, .. } = source {
1111 let mut session_priv_bytes = [0; 32];
1112 session_priv_bytes.copy_from_slice(&session_priv[..]);
1113 if let hash_map::Entry::Occupied(mut payment) = outbounds.entry(payment_id) {
1114 assert!(payment.get().is_fulfilled());
1115 if payment.get_mut().remove(&session_priv_bytes, None) {
1116 pending_events.push(
1117 events::Event::PaymentPathSuccessful {
1119 payment_hash: payment.get().payment_hash(),
1129 pub(super) fn remove_stale_resolved_payments(&self, pending_events: &Mutex<Vec<events::Event>>) {
1130 // If an outbound payment was completed, and no pending HTLCs remain, we should remove it
1131 // from the map. However, if we did that immediately when the last payment HTLC is claimed,
1132 // this could race the user making a duplicate send_payment call and our idempotency
1133 // guarantees would be violated. Instead, we wait a few timer ticks to do the actual
1134 // removal. This should be more than sufficient to ensure the idempotency of any
1135 // `send_payment` calls that were made at the same time the `PaymentSent` event was being
1137 let mut pending_outbound_payments = self.pending_outbound_payments.lock().unwrap();
1138 let pending_events = pending_events.lock().unwrap();
1139 pending_outbound_payments.retain(|payment_id, payment| {
1140 if let PendingOutboundPayment::Fulfilled { session_privs, timer_ticks_without_htlcs, .. } = payment {
1141 let mut no_remaining_entries = session_privs.is_empty();
1142 if no_remaining_entries {
1143 for ev in pending_events.iter() {
1145 events::Event::PaymentSent { payment_id: Some(ev_payment_id), .. } |
1146 events::Event::PaymentPathSuccessful { payment_id: ev_payment_id, .. } |
1147 events::Event::PaymentPathFailed { payment_id: Some(ev_payment_id), .. } => {
1148 if payment_id == ev_payment_id {
1149 no_remaining_entries = false;
1157 if no_remaining_entries {
1158 *timer_ticks_without_htlcs += 1;
1159 *timer_ticks_without_htlcs <= IDEMPOTENCY_TIMEOUT_TICKS
1161 *timer_ticks_without_htlcs = 0;
1168 // Returns a bool indicating whether a PendingHTLCsForwardable event should be generated.
1169 pub(super) fn fail_htlc<L: Deref>(
1170 &self, source: &HTLCSource, payment_hash: &PaymentHash, onion_error: &HTLCFailReason,
1171 path: &Vec<RouteHop>, session_priv: &SecretKey, payment_id: &PaymentId,
1172 probing_cookie_secret: [u8; 32], secp_ctx: &Secp256k1<secp256k1::All>,
1173 pending_events: &Mutex<Vec<events::Event>>, logger: &L
1174 ) -> bool where L::Target: Logger {
1176 let (network_update, short_channel_id, payment_retryable, onion_error_code, onion_error_data) = onion_error.decode_onion_failure(secp_ctx, logger, &source);
1178 let (network_update, short_channel_id, payment_retryable, _, _) = onion_error.decode_onion_failure(secp_ctx, logger, &source);
1180 let payment_is_probe = payment_is_probe(payment_hash, &payment_id, probing_cookie_secret);
1181 let mut session_priv_bytes = [0; 32];
1182 session_priv_bytes.copy_from_slice(&session_priv[..]);
1183 let mut outbounds = self.pending_outbound_payments.lock().unwrap();
1185 // If any payments already need retry, there's no need to generate a redundant
1186 // `PendingHTLCsForwardable`.
1187 let already_awaiting_retry = outbounds.iter().any(|(_, pmt)| {
1188 let mut awaiting_retry = false;
1189 if pmt.is_auto_retryable_now() {
1190 if let PendingOutboundPayment::Retryable { pending_amt_msat, total_msat, .. } = pmt {
1191 if pending_amt_msat < total_msat {
1192 awaiting_retry = true;
1199 let mut full_failure_ev = None;
1200 let mut pending_retry_ev = false;
1201 let attempts_remaining = if let hash_map::Entry::Occupied(mut payment) = outbounds.entry(*payment_id) {
1202 if !payment.get_mut().remove(&session_priv_bytes, Some(&path)) {
1203 log_trace!(logger, "Received duplicative fail for HTLC with payment_hash {}", log_bytes!(payment_hash.0));
1206 if payment.get().is_fulfilled() {
1207 log_trace!(logger, "Received failure of HTLC with payment_hash {} after payment completion", log_bytes!(payment_hash.0));
1210 let mut is_retryable_now = payment.get().is_auto_retryable_now();
1211 if let Some(scid) = short_channel_id {
1212 // TODO: If we decided to blame ourselves (or one of our channels) in
1213 // process_onion_failure we should close that channel as it implies our
1214 // next-hop is needlessly blaming us!
1215 payment.get_mut().insert_previously_failed_scid(scid);
1218 if payment_is_probe || !is_retryable_now || !payment_retryable {
1219 let _ = payment.get_mut().mark_abandoned(); // we'll only Err if it's a legacy payment
1220 is_retryable_now = false;
1222 if payment.get().remaining_parts() == 0 {
1223 if payment.get().abandoned() {
1224 if !payment_is_probe {
1225 full_failure_ev = Some(events::Event::PaymentFailed {
1226 payment_id: *payment_id,
1227 payment_hash: payment.get().payment_hash().expect("PendingOutboundPayments::RetriesExceeded always has a payment hash set"),
1235 log_trace!(logger, "Received duplicative fail for HTLC with payment_hash {}", log_bytes!(payment_hash.0));
1238 core::mem::drop(outbounds);
1239 log_trace!(logger, "Failing outbound payment HTLC with payment_hash {}", log_bytes!(payment_hash.0));
1241 let path_failure = {
1242 if payment_is_probe {
1243 if !payment_retryable {
1244 events::Event::ProbeSuccessful {
1245 payment_id: *payment_id,
1246 payment_hash: payment_hash.clone(),
1250 events::Event::ProbeFailed {
1251 payment_id: *payment_id,
1252 payment_hash: payment_hash.clone(),
1258 // If we miss abandoning the payment above, we *must* generate an event here or else the
1259 // payment will sit in our outbounds forever.
1260 if attempts_remaining && !already_awaiting_retry {
1261 debug_assert!(full_failure_ev.is_none());
1262 pending_retry_ev = true;
1264 events::Event::PaymentPathFailed {
1265 payment_id: Some(*payment_id),
1266 payment_hash: payment_hash.clone(),
1267 payment_failed_permanently: !payment_retryable,
1268 failure: events::PathFailure::OnPath { network_update },
1272 error_code: onion_error_code,
1274 error_data: onion_error_data
1278 let mut pending_events = pending_events.lock().unwrap();
1279 pending_events.push(path_failure);
1280 if let Some(ev) = full_failure_ev { pending_events.push(ev); }
1284 pub(super) fn abandon_payment(
1285 &self, payment_id: PaymentId, pending_events: &Mutex<Vec<events::Event>>
1287 let mut outbounds = self.pending_outbound_payments.lock().unwrap();
1288 if let hash_map::Entry::Occupied(mut payment) = outbounds.entry(payment_id) {
1289 if let Ok(()) = payment.get_mut().mark_abandoned() {
1290 if payment.get().remaining_parts() == 0 {
1291 pending_events.lock().unwrap().push(events::Event::PaymentFailed {
1293 payment_hash: payment.get().payment_hash().expect("PendingOutboundPayments::RetriesExceeded always has a payment hash set"),
1302 pub fn has_pending_payments(&self) -> bool {
1303 !self.pending_outbound_payments.lock().unwrap().is_empty()
1307 pub fn clear_pending_payments(&self) {
1308 self.pending_outbound_payments.lock().unwrap().clear()
1312 /// Returns whether a payment with the given [`PaymentHash`] and [`PaymentId`] is, in fact, a
1314 pub(super) fn payment_is_probe(payment_hash: &PaymentHash, payment_id: &PaymentId,
1315 probing_cookie_secret: [u8; 32]) -> bool
1317 let target_payment_hash = probing_cookie_from_id(payment_id, probing_cookie_secret);
1318 target_payment_hash == *payment_hash
1321 /// Returns the 'probing cookie' for the given [`PaymentId`].
1322 fn probing_cookie_from_id(payment_id: &PaymentId, probing_cookie_secret: [u8; 32]) -> PaymentHash {
1323 let mut preimage = [0u8; 64];
1324 preimage[..32].copy_from_slice(&probing_cookie_secret);
1325 preimage[32..].copy_from_slice(&payment_id.0);
1326 PaymentHash(Sha256::hash(&preimage).into_inner())
1329 impl_writeable_tlv_based_enum_upgradable!(PendingOutboundPayment,
1331 (0, session_privs, required),
1334 (0, session_privs, required),
1335 (1, payment_hash, option),
1336 (3, timer_ticks_without_htlcs, (default_value, 0)),
1339 (0, session_privs, required),
1340 (1, pending_fee_msat, option),
1341 (2, payment_hash, required),
1342 // Note that while we "default" payment_param's final CLTV expiry delta to 0 we should
1343 // never see it - `payment_params` was added here after the field was added/required.
1344 (3, payment_params, (option: ReadableArgs, 0)),
1345 (4, payment_secret, option),
1346 (5, keysend_preimage, option),
1347 (6, total_msat, required),
1348 (8, pending_amt_msat, required),
1349 (10, starting_block_height, required),
1350 (not_written, retry_strategy, (static_value, None)),
1351 (not_written, attempts, (static_value, PaymentAttempts::new())),
1354 (0, session_privs, required),
1355 (2, payment_hash, required),
1361 use bitcoin::network::constants::Network;
1362 use bitcoin::secp256k1::{PublicKey, Secp256k1, SecretKey};
1364 use crate::events::{Event, PathFailure};
1365 use crate::ln::PaymentHash;
1366 use crate::ln::channelmanager::{PaymentId, RecipientOnionFields};
1367 use crate::ln::features::{ChannelFeatures, NodeFeatures};
1368 use crate::ln::msgs::{ErrorAction, LightningError};
1369 use crate::ln::outbound_payment::{OutboundPayments, Retry, RetryableSendFailure};
1370 use crate::routing::gossip::NetworkGraph;
1371 use crate::routing::router::{InFlightHtlcs, PaymentParameters, Route, RouteHop, RouteParameters};
1372 use crate::sync::{Arc, Mutex};
1373 use crate::util::errors::APIError;
1374 use crate::util::test_utils;
1377 #[cfg(feature = "std")]
1378 fn fails_paying_after_expiration() {
1379 do_fails_paying_after_expiration(false);
1380 do_fails_paying_after_expiration(true);
1382 #[cfg(feature = "std")]
1383 fn do_fails_paying_after_expiration(on_retry: bool) {
1384 let outbound_payments = OutboundPayments::new();
1385 let logger = test_utils::TestLogger::new();
1386 let network_graph = Arc::new(NetworkGraph::new(Network::Testnet, &logger));
1387 let scorer = Mutex::new(test_utils::TestScorer::new());
1388 let router = test_utils::TestRouter::new(network_graph, &scorer);
1389 let secp_ctx = Secp256k1::new();
1390 let keys_manager = test_utils::TestKeysInterface::new(&[0; 32], Network::Testnet);
1392 let past_expiry_time = std::time::SystemTime::UNIX_EPOCH.elapsed().unwrap().as_secs() - 2;
1393 let payment_params = PaymentParameters::from_node_id(
1394 PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap()),
1396 ).with_expiry_time(past_expiry_time);
1397 let expired_route_params = RouteParameters {
1399 final_value_msat: 0,
1401 let pending_events = Mutex::new(Vec::new());
1403 outbound_payments.add_new_pending_payment(PaymentHash([0; 32]), RecipientOnionFields::spontaneous_empty(),
1404 PaymentId([0; 32]), None, &Route { paths: vec![], payment_params: None },
1405 Some(Retry::Attempts(1)), Some(expired_route_params.payment_params.clone()),
1406 &&keys_manager, 0).unwrap();
1407 outbound_payments.retry_payment_internal(
1408 PaymentHash([0; 32]), PaymentId([0; 32]), expired_route_params, &&router, vec![],
1409 &|| InFlightHtlcs::new(), &&keys_manager, &&keys_manager, 0, &&logger,
1410 &pending_events, &|_, _, _, _, _, _, _, _| Ok(()));
1411 let events = pending_events.lock().unwrap();
1412 assert_eq!(events.len(), 1);
1413 if let Event::PaymentFailed { .. } = events[0] { } else { panic!("Unexpected event"); }
1415 let err = outbound_payments.send_payment(
1416 PaymentHash([0; 32]), RecipientOnionFields::spontaneous_empty(), PaymentId([0; 32]),
1417 Retry::Attempts(0), expired_route_params, &&router, vec![], || InFlightHtlcs::new(),
1418 &&keys_manager, &&keys_manager, 0, &&logger,
1419 &pending_events, |_, _, _, _, _, _, _, _| Ok(())).unwrap_err();
1420 if let RetryableSendFailure::PaymentExpired = err { } else { panic!("Unexpected error"); }
1425 fn find_route_error() {
1426 do_find_route_error(false);
1427 do_find_route_error(true);
1429 fn do_find_route_error(on_retry: bool) {
1430 let outbound_payments = OutboundPayments::new();
1431 let logger = test_utils::TestLogger::new();
1432 let network_graph = Arc::new(NetworkGraph::new(Network::Testnet, &logger));
1433 let scorer = Mutex::new(test_utils::TestScorer::new());
1434 let router = test_utils::TestRouter::new(network_graph, &scorer);
1435 let secp_ctx = Secp256k1::new();
1436 let keys_manager = test_utils::TestKeysInterface::new(&[0; 32], Network::Testnet);
1438 let payment_params = PaymentParameters::from_node_id(
1439 PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap()), 0);
1440 let route_params = RouteParameters {
1442 final_value_msat: 0,
1444 router.expect_find_route(route_params.clone(),
1445 Err(LightningError { err: String::new(), action: ErrorAction::IgnoreError }));
1447 let pending_events = Mutex::new(Vec::new());
1449 outbound_payments.add_new_pending_payment(PaymentHash([0; 32]), RecipientOnionFields::spontaneous_empty(),
1450 PaymentId([0; 32]), None, &Route { paths: vec![], payment_params: None },
1451 Some(Retry::Attempts(1)), Some(route_params.payment_params.clone()),
1452 &&keys_manager, 0).unwrap();
1453 outbound_payments.retry_payment_internal(
1454 PaymentHash([0; 32]), PaymentId([0; 32]), route_params, &&router, vec![],
1455 &|| InFlightHtlcs::new(), &&keys_manager, &&keys_manager, 0, &&logger,
1456 &pending_events, &|_, _, _, _, _, _, _, _| Ok(()));
1457 let events = pending_events.lock().unwrap();
1458 assert_eq!(events.len(), 1);
1459 if let Event::PaymentFailed { .. } = events[0] { } else { panic!("Unexpected event"); }
1461 let err = outbound_payments.send_payment(
1462 PaymentHash([0; 32]), RecipientOnionFields::spontaneous_empty(), PaymentId([0; 32]),
1463 Retry::Attempts(0), route_params, &&router, vec![], || InFlightHtlcs::new(),
1464 &&keys_manager, &&keys_manager, 0, &&logger,
1465 &pending_events, |_, _, _, _, _, _, _, _| Ok(())).unwrap_err();
1466 if let RetryableSendFailure::RouteNotFound = err {
1467 } else { panic!("Unexpected error"); }
1472 fn initial_send_payment_path_failed_evs() {
1473 let outbound_payments = OutboundPayments::new();
1474 let logger = test_utils::TestLogger::new();
1475 let network_graph = Arc::new(NetworkGraph::new(Network::Testnet, &logger));
1476 let scorer = Mutex::new(test_utils::TestScorer::new());
1477 let router = test_utils::TestRouter::new(network_graph, &scorer);
1478 let secp_ctx = Secp256k1::new();
1479 let keys_manager = test_utils::TestKeysInterface::new(&[0; 32], Network::Testnet);
1481 let sender_pk = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap());
1482 let receiver_pk = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[43; 32]).unwrap());
1483 let payment_params = PaymentParameters::from_node_id(sender_pk, 0);
1484 let route_params = RouteParameters {
1485 payment_params: payment_params.clone(),
1486 final_value_msat: 0,
1488 let failed_scid = 42;
1490 paths: vec![vec![RouteHop {
1491 pubkey: receiver_pk,
1492 node_features: NodeFeatures::empty(),
1493 short_channel_id: failed_scid,
1494 channel_features: ChannelFeatures::empty(),
1496 cltv_expiry_delta: 0,
1498 payment_params: Some(payment_params),
1500 router.expect_find_route(route_params.clone(), Ok(route.clone()));
1501 let mut route_params_w_failed_scid = route_params.clone();
1502 route_params_w_failed_scid.payment_params.previously_failed_channels.push(failed_scid);
1503 router.expect_find_route(route_params_w_failed_scid, Ok(route.clone()));
1504 router.expect_find_route(route_params.clone(), Ok(route.clone()));
1505 router.expect_find_route(route_params.clone(), Ok(route.clone()));
1507 // Ensure that a ChannelUnavailable error will result in blaming an scid in the
1508 // PaymentPathFailed event.
1509 let pending_events = Mutex::new(Vec::new());
1510 outbound_payments.send_payment(
1511 PaymentHash([0; 32]), RecipientOnionFields::spontaneous_empty(), PaymentId([0; 32]),
1512 Retry::Attempts(0), route_params.clone(), &&router, vec![], || InFlightHtlcs::new(),
1513 &&keys_manager, &&keys_manager, 0, &&logger, &pending_events,
1514 |_, _, _, _, _, _, _, _| Err(APIError::ChannelUnavailable { err: "test".to_owned() }))
1516 let mut events = pending_events.lock().unwrap();
1517 assert_eq!(events.len(), 2);
1518 if let Event::PaymentPathFailed {
1520 failure: PathFailure::InitialSend { err: APIError::ChannelUnavailable { .. }}, .. } = events[0]
1522 assert_eq!(short_channel_id, Some(failed_scid));
1523 } else { panic!("Unexpected event"); }
1524 if let Event::PaymentFailed { .. } = events[1] { } else { panic!("Unexpected event"); }
1526 core::mem::drop(events);
1528 // Ensure that a MonitorUpdateInProgress "error" will not result in a PaymentPathFailed event.
1529 outbound_payments.send_payment(
1530 PaymentHash([0; 32]), RecipientOnionFields::spontaneous_empty(), PaymentId([0; 32]),
1531 Retry::Attempts(0), route_params.clone(), &&router, vec![], || InFlightHtlcs::new(),
1532 &&keys_manager, &&keys_manager, 0, &&logger, &pending_events,
1533 |_, _, _, _, _, _, _, _| Err(APIError::MonitorUpdateInProgress)).unwrap();
1534 assert_eq!(pending_events.lock().unwrap().len(), 0);
1536 // Ensure that any other error will result in a PaymentPathFailed event but no blamed scid.
1537 outbound_payments.send_payment(
1538 PaymentHash([0; 32]), RecipientOnionFields::spontaneous_empty(), PaymentId([1; 32]),
1539 Retry::Attempts(0), route_params.clone(), &&router, vec![], || InFlightHtlcs::new(),
1540 &&keys_manager, &&keys_manager, 0, &&logger, &pending_events,
1541 |_, _, _, _, _, _, _, _| Err(APIError::APIMisuseError { err: "test".to_owned() }))
1543 let events = pending_events.lock().unwrap();
1544 assert_eq!(events.len(), 2);
1545 if let Event::PaymentPathFailed {
1547 failure: PathFailure::InitialSend { err: APIError::APIMisuseError { .. }}, .. } = events[0]
1549 assert_eq!(short_channel_id, None);
1550 } else { panic!("Unexpected event"); }
1551 if let Event::PaymentFailed { .. } = events[1] { } else { panic!("Unexpected event"); }