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 payment_metadata: Option<Vec<u8>>,
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 we've decided to give up retrying a payment, we mark it as abandoned so we can eventually
68 /// generate a `PaymentFailed` event when all HTLCs have irrevocably failed.
70 session_privs: HashSet<[u8; 32]>,
71 payment_hash: PaymentHash,
75 impl PendingOutboundPayment {
76 fn increment_attempts(&mut self) {
77 if let PendingOutboundPayment::Retryable { attempts, .. } = self {
81 fn is_auto_retryable_now(&self) -> bool {
83 PendingOutboundPayment::Retryable {
84 retry_strategy: Some(strategy), attempts, payment_params: Some(_), ..
86 strategy.is_retryable_now(&attempts)
91 fn is_retryable_now(&self) -> bool {
93 PendingOutboundPayment::Retryable { retry_strategy: None, .. } => {
94 // We're handling retries manually, we can always retry.
97 PendingOutboundPayment::Retryable { retry_strategy: Some(strategy), attempts, .. } => {
98 strategy.is_retryable_now(&attempts)
103 pub fn insert_previously_failed_scid(&mut self, scid: u64) {
104 if let PendingOutboundPayment::Retryable { payment_params: Some(params), .. } = self {
105 params.previously_failed_channels.push(scid);
108 pub(super) fn is_fulfilled(&self) -> bool {
110 PendingOutboundPayment::Fulfilled { .. } => true,
114 pub(super) fn abandoned(&self) -> bool {
116 PendingOutboundPayment::Abandoned { .. } => true,
120 fn get_pending_fee_msat(&self) -> Option<u64> {
122 PendingOutboundPayment::Retryable { pending_fee_msat, .. } => pending_fee_msat.clone(),
127 fn payment_hash(&self) -> Option<PaymentHash> {
129 PendingOutboundPayment::Legacy { .. } => None,
130 PendingOutboundPayment::Retryable { payment_hash, .. } => Some(*payment_hash),
131 PendingOutboundPayment::Fulfilled { payment_hash, .. } => *payment_hash,
132 PendingOutboundPayment::Abandoned { payment_hash, .. } => Some(*payment_hash),
136 fn mark_fulfilled(&mut self) {
137 let mut session_privs = HashSet::new();
138 core::mem::swap(&mut session_privs, match self {
139 PendingOutboundPayment::Legacy { session_privs } |
140 PendingOutboundPayment::Retryable { session_privs, .. } |
141 PendingOutboundPayment::Fulfilled { session_privs, .. } |
142 PendingOutboundPayment::Abandoned { session_privs, .. }
145 let payment_hash = self.payment_hash();
146 *self = PendingOutboundPayment::Fulfilled { session_privs, payment_hash, timer_ticks_without_htlcs: 0 };
149 fn mark_abandoned(&mut self) -> Result<(), ()> {
150 let mut session_privs = HashSet::new();
151 let our_payment_hash;
152 core::mem::swap(&mut session_privs, match self {
153 PendingOutboundPayment::Legacy { .. } |
154 PendingOutboundPayment::Fulfilled { .. } =>
156 PendingOutboundPayment::Retryable { session_privs, payment_hash, .. } |
157 PendingOutboundPayment::Abandoned { session_privs, payment_hash, .. } => {
158 our_payment_hash = *payment_hash;
162 *self = PendingOutboundPayment::Abandoned { session_privs, payment_hash: our_payment_hash };
166 /// panics if path is None and !self.is_fulfilled
167 fn remove(&mut self, session_priv: &[u8; 32], path: Option<&Vec<RouteHop>>) -> bool {
168 let remove_res = match self {
169 PendingOutboundPayment::Legacy { session_privs } |
170 PendingOutboundPayment::Retryable { session_privs, .. } |
171 PendingOutboundPayment::Fulfilled { session_privs, .. } |
172 PendingOutboundPayment::Abandoned { session_privs, .. } => {
173 session_privs.remove(session_priv)
177 if let PendingOutboundPayment::Retryable { ref mut pending_amt_msat, ref mut pending_fee_msat, .. } = self {
178 let path = path.expect("Fulfilling a payment should always come with a path");
179 let path_last_hop = path.last().expect("Outbound payments must have had a valid path");
180 *pending_amt_msat -= path_last_hop.fee_msat;
181 if let Some(fee_msat) = pending_fee_msat.as_mut() {
182 *fee_msat -= path.get_path_fees();
189 pub(super) fn insert(&mut self, session_priv: [u8; 32], path: &Vec<RouteHop>) -> bool {
190 let insert_res = match self {
191 PendingOutboundPayment::Legacy { session_privs } |
192 PendingOutboundPayment::Retryable { session_privs, .. } => {
193 session_privs.insert(session_priv)
195 PendingOutboundPayment::Fulfilled { .. } => false,
196 PendingOutboundPayment::Abandoned { .. } => false,
199 if let PendingOutboundPayment::Retryable { ref mut pending_amt_msat, ref mut pending_fee_msat, .. } = self {
200 let path_last_hop = path.last().expect("Outbound payments must have had a valid path");
201 *pending_amt_msat += path_last_hop.fee_msat;
202 if let Some(fee_msat) = pending_fee_msat.as_mut() {
203 *fee_msat += path.get_path_fees();
210 pub(super) fn remaining_parts(&self) -> usize {
212 PendingOutboundPayment::Legacy { session_privs } |
213 PendingOutboundPayment::Retryable { session_privs, .. } |
214 PendingOutboundPayment::Fulfilled { session_privs, .. } |
215 PendingOutboundPayment::Abandoned { session_privs, .. } => {
222 /// Strategies available to retry payment path failures.
223 #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
225 /// Max number of attempts to retry payment.
227 /// Each attempt may be multiple HTLCs along multiple paths if the router decides to split up a
228 /// retry, and may retry multiple failed HTLCs at once if they failed around the same time and
229 /// were retried along a route from a single call to [`Router::find_route_with_id`].
231 #[cfg(not(feature = "no-std"))]
232 /// Time elapsed before abandoning retries for a payment. At least one attempt at payment is made;
233 /// see [`PaymentParameters::expiry_time`] to avoid any attempt at payment after a specific time.
235 /// [`PaymentParameters::expiry_time`]: crate::routing::router::PaymentParameters::expiry_time
236 Timeout(core::time::Duration),
240 pub(crate) fn is_retryable_now(&self, attempts: &PaymentAttempts) -> bool {
241 match (self, attempts) {
242 (Retry::Attempts(max_retry_count), PaymentAttempts { count, .. }) => {
243 max_retry_count > count
245 #[cfg(all(not(feature = "no-std"), not(test)))]
246 (Retry::Timeout(max_duration), PaymentAttempts { first_attempted_at, .. }) =>
247 *max_duration >= std::time::Instant::now().duration_since(*first_attempted_at),
248 #[cfg(all(not(feature = "no-std"), test))]
249 (Retry::Timeout(max_duration), PaymentAttempts { first_attempted_at, .. }) =>
250 *max_duration >= SinceEpoch::now().duration_since(*first_attempted_at),
255 #[cfg(feature = "std")]
256 pub(super) fn has_expired(route_params: &RouteParameters) -> bool {
257 if let Some(expiry_time) = route_params.payment_params.expiry_time {
258 if let Ok(elapsed) = std::time::SystemTime::UNIX_EPOCH.elapsed() {
259 return elapsed > core::time::Duration::from_secs(expiry_time)
265 pub(crate) type PaymentAttempts = PaymentAttemptsUsingTime<ConfiguredTime>;
267 /// Storing minimal payment attempts information required for determining if a outbound payment can
269 pub(crate) struct PaymentAttemptsUsingTime<T: Time> {
270 /// This count will be incremented only after the result of the attempt is known. When it's 0,
271 /// it means the result of the first attempt is not known yet.
272 pub(crate) count: usize,
273 /// This field is only used when retry is `Retry::Timeout` which is only build with feature std
274 #[cfg(not(feature = "no-std"))]
275 first_attempted_at: T,
276 #[cfg(feature = "no-std")]
277 phantom: core::marker::PhantomData<T>,
281 #[cfg(not(any(feature = "no-std", test)))]
282 type ConfiguredTime = std::time::Instant;
283 #[cfg(feature = "no-std")]
284 type ConfiguredTime = crate::util::time::Eternity;
285 #[cfg(all(not(feature = "no-std"), test))]
286 type ConfiguredTime = SinceEpoch;
288 impl<T: Time> PaymentAttemptsUsingTime<T> {
289 pub(crate) fn new() -> Self {
290 PaymentAttemptsUsingTime {
292 #[cfg(not(feature = "no-std"))]
293 first_attempted_at: T::now(),
294 #[cfg(feature = "no-std")]
295 phantom: core::marker::PhantomData,
300 impl<T: Time> Display for PaymentAttemptsUsingTime<T> {
301 fn fmt(&self, f: &mut Formatter) -> Result<(), fmt::Error> {
302 #[cfg(feature = "no-std")]
303 return write!(f, "attempts: {}", self.count);
304 #[cfg(not(feature = "no-std"))]
307 "attempts: {}, duration: {}s",
309 T::now().duration_since(self.first_attempted_at).as_secs()
314 /// Indicates an immediate error on [`ChannelManager::send_payment`]. Further errors may be
315 /// surfaced later via [`Event::PaymentPathFailed`] and [`Event::PaymentFailed`].
317 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
318 /// [`Event::PaymentPathFailed`]: crate::events::Event::PaymentPathFailed
319 /// [`Event::PaymentFailed`]: crate::events::Event::PaymentFailed
320 #[derive(Clone, Debug)]
321 pub enum RetryableSendFailure {
322 /// The provided [`PaymentParameters::expiry_time`] indicated that the payment has expired. Note
323 /// that this error is *not* caused by [`Retry::Timeout`].
325 /// [`PaymentParameters::expiry_time`]: crate::routing::router::PaymentParameters::expiry_time
327 /// We were unable to find a route to the destination.
329 /// Indicates that a payment for the provided [`PaymentId`] is already in-flight and has not
330 /// yet completed (i.e. generated an [`Event::PaymentSent`] or [`Event::PaymentFailed`]).
332 /// [`PaymentId`]: crate::ln::channelmanager::PaymentId
333 /// [`Event::PaymentSent`]: crate::events::Event::PaymentSent
334 /// [`Event::PaymentFailed`]: crate::events::Event::PaymentFailed
338 /// If a payment fails to send with [`ChannelManager::send_payment_with_route`], it can be in one
339 /// of several states. This enum is returned as the Err() type describing which state the payment
340 /// is in, see the description of individual enum states for more.
342 /// [`ChannelManager::send_payment_with_route`]: crate::ln::channelmanager::ChannelManager::send_payment_with_route
343 #[derive(Clone, Debug)]
344 pub enum PaymentSendFailure {
345 /// A parameter which was passed to send_payment was invalid, preventing us from attempting to
346 /// send the payment at all.
348 /// You can freely resend the payment in full (with the parameter error fixed).
350 /// Because the payment failed outright, no payment tracking is done and no
351 /// [`Event::PaymentPathFailed`] or [`Event::PaymentFailed`] events will be generated.
353 /// [`Event::PaymentPathFailed`]: crate::events::Event::PaymentPathFailed
354 /// [`Event::PaymentFailed`]: crate::events::Event::PaymentFailed
355 ParameterError(APIError),
356 /// A parameter in a single path which was passed to send_payment was invalid, preventing us
357 /// from attempting to send the payment at all.
359 /// You can freely resend the payment in full (with the parameter error fixed).
361 /// Because the payment failed outright, no payment tracking is done and no
362 /// [`Event::PaymentPathFailed`] or [`Event::PaymentFailed`] events will be generated.
364 /// The results here are ordered the same as the paths in the route object which was passed to
367 /// [`Event::PaymentPathFailed`]: crate::events::Event::PaymentPathFailed
368 /// [`Event::PaymentFailed`]: crate::events::Event::PaymentFailed
369 PathParameterError(Vec<Result<(), APIError>>),
370 /// All paths which were attempted failed to send, with no channel state change taking place.
371 /// You can freely resend the payment in full (though you probably want to do so over different
372 /// paths than the ones selected).
374 /// Because the payment failed outright, no payment tracking is done and no
375 /// [`Event::PaymentPathFailed`] or [`Event::PaymentFailed`] events will be generated.
377 /// [`Event::PaymentPathFailed`]: crate::events::Event::PaymentPathFailed
378 /// [`Event::PaymentFailed`]: crate::events::Event::PaymentFailed
379 AllFailedResendSafe(Vec<APIError>),
380 /// Indicates that a payment for the provided [`PaymentId`] is already in-flight and has not
381 /// yet completed (i.e. generated an [`Event::PaymentSent`] or [`Event::PaymentFailed`]).
383 /// [`PaymentId`]: crate::ln::channelmanager::PaymentId
384 /// [`Event::PaymentSent`]: crate::events::Event::PaymentSent
385 /// [`Event::PaymentFailed`]: crate::events::Event::PaymentFailed
387 /// Some paths that were attempted failed to send, though some paths may have succeeded. At least
388 /// some paths have irrevocably committed to the HTLC.
390 /// The results here are ordered the same as the paths in the route object that was passed to
393 /// Any entries that contain `Err(APIError::MonitorUpdateInprogress)` will send once a
394 /// [`MonitorEvent::Completed`] is provided for the next-hop channel with the latest update_id.
396 /// [`MonitorEvent::Completed`]: crate::chain::channelmonitor::MonitorEvent::Completed
398 /// The errors themselves, in the same order as the paths from the route.
399 results: Vec<Result<(), APIError>>,
400 /// If some paths failed without irrevocably committing to the new HTLC(s), this will
401 /// contain a [`RouteParameters`] object for the failing paths.
402 failed_paths_retry: Option<RouteParameters>,
403 /// The payment id for the payment, which is now at least partially pending.
404 payment_id: PaymentId,
408 /// Information which is provided, encrypted, to the payment recipient when sending HTLCs.
410 /// This should generally be constructed with data communicated to us from the recipient (via a
411 /// BOLT11 or BOLT12 invoice).
413 pub struct RecipientOnionFields {
414 /// The [`PaymentSecret`] is an arbitrary 32 bytes provided by the recipient for us to repeat
415 /// in the onion. It is unrelated to `payment_hash` (or [`PaymentPreimage`]) and exists to
416 /// authenticate the sender to the recipient and prevent payment-probing (deanonymization)
419 /// If you do not have one, the [`Route`] you pay over must not contain multiple paths as
420 /// multi-path payments require a recipient-provided secret.
422 /// Note that for spontaneous payments most lightning nodes do not currently support MPP
423 /// receives, thus you should generally never be providing a secret here for spontaneous
425 pub payment_secret: Option<PaymentSecret>,
426 /// The payment metadata serves a similar purpose as [`Self::payment_secret`] but is of
427 /// arbitrary length. This gives recipients substantially more flexibility to receive
430 /// In LDK, while the [`Self::payment_secret`] is fixed based on an internal authentication
431 /// scheme to authenticate received payments against expected payments and invoices, this field
432 /// is not used in LDK for received payments, and can be used to store arbitrary data in
433 /// invoices which will be received with the payment.
435 /// Note that this field was added to the lightning specification more recently than
436 /// [`Self::payment_secret`] and while nearly all lightning senders support secrets, metadata
437 /// may not be supported as universally.
438 pub payment_metadata: Option<Vec<u8>>,
441 impl_writeable_tlv_based!(RecipientOnionFields, {
442 (0, payment_secret, option),
443 (2, payment_metadata, option),
446 impl RecipientOnionFields {
447 /// Creates a [`RecipientOnionFields`] from only a [`PaymentSecret`]. This is the most common
448 /// set of onion fields for today's BOLT11 invoices - most nodes require a [`PaymentSecret`]
449 /// but do not require or provide any further data.
450 pub fn secret_only(payment_secret: PaymentSecret) -> Self {
451 Self { payment_secret: Some(payment_secret), payment_metadata: None }
454 /// Creates a new [`RecipientOnionFields`] with no fields. This generally does not create
455 /// payable HTLCs except for spontaneous payments, i.e. this should generally only be used for
456 /// calls to [`ChannelManager::send_spontaneous_payment`].
458 /// [`ChannelManager::send_spontaneous_payment`]: super::channelmanager::ChannelManager::send_spontaneous_payment
459 pub fn spontaneous_empty() -> Self {
460 Self { payment_secret: None, payment_metadata: None }
463 /// When we have received some HTLC(s) towards an MPP payment, as we receive further HTLC(s) we
464 /// have to make sure that some fields match exactly across the parts. For those that aren't
465 /// required to match, if they don't match we should remove them so as to not expose data
466 /// that's dependent on the HTLC receive order to users.
468 /// Here we implement this, first checking compatibility then mutating two objects and then
469 /// dropping any remaining non-matching fields from both.
470 pub(super) fn check_merge(&mut self, further_htlc_fields: &mut Self) -> Result<(), ()> {
471 if self.payment_secret != further_htlc_fields.payment_secret { return Err(()); }
472 if self.payment_metadata != further_htlc_fields.payment_metadata { return Err(()); }
473 // For custom TLVs we should just drop non-matching ones, but not reject the payment.
478 pub(super) struct OutboundPayments {
479 pub(super) pending_outbound_payments: Mutex<HashMap<PaymentId, PendingOutboundPayment>>,
480 pub(super) retry_lock: Mutex<()>,
483 impl OutboundPayments {
484 pub(super) fn new() -> Self {
486 pending_outbound_payments: Mutex::new(HashMap::new()),
487 retry_lock: Mutex::new(()),
491 pub(super) fn send_payment<R: Deref, ES: Deref, NS: Deref, IH, SP, L: Deref>(
492 &self, payment_hash: PaymentHash, recipient_onion: RecipientOnionFields, payment_id: PaymentId,
493 retry_strategy: Retry, route_params: RouteParameters, router: &R,
494 first_hops: Vec<ChannelDetails>, compute_inflight_htlcs: IH, entropy_source: &ES,
495 node_signer: &NS, best_block_height: u32, logger: &L,
496 pending_events: &Mutex<Vec<events::Event>>, send_payment_along_path: SP,
497 ) -> Result<(), RetryableSendFailure>
500 ES::Target: EntropySource,
501 NS::Target: NodeSigner,
503 IH: Fn() -> InFlightHtlcs,
504 SP: Fn(&Vec<RouteHop>, &PaymentHash, RecipientOnionFields, u64, u32, PaymentId,
505 &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>,
507 self.send_payment_internal(payment_id, payment_hash, recipient_onion, None, retry_strategy,
508 route_params, router, first_hops, &compute_inflight_htlcs, entropy_source, node_signer,
509 best_block_height, logger, pending_events, &send_payment_along_path)
512 pub(super) fn send_payment_with_route<ES: Deref, NS: Deref, F>(
513 &self, route: &Route, payment_hash: PaymentHash, recipient_onion: RecipientOnionFields,
514 payment_id: PaymentId, entropy_source: &ES, node_signer: &NS, best_block_height: u32,
515 send_payment_along_path: F
516 ) -> Result<(), PaymentSendFailure>
518 ES::Target: EntropySource,
519 NS::Target: NodeSigner,
520 F: Fn(&Vec<RouteHop>, &PaymentHash, RecipientOnionFields, u64, u32, PaymentId,
521 &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
523 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)?;
524 self.pay_route_internal(route, payment_hash, recipient_onion, None, payment_id, None,
525 onion_session_privs, node_signer, best_block_height, &send_payment_along_path)
526 .map_err(|e| { self.remove_outbound_if_all_failed(payment_id, &e); e })
529 pub(super) fn send_spontaneous_payment<R: Deref, ES: Deref, NS: Deref, IH, SP, L: Deref>(
530 &self, payment_preimage: Option<PaymentPreimage>, recipient_onion: RecipientOnionFields,
531 payment_id: PaymentId, retry_strategy: Retry, route_params: RouteParameters, router: &R,
532 first_hops: Vec<ChannelDetails>, inflight_htlcs: IH, entropy_source: &ES,
533 node_signer: &NS, best_block_height: u32, logger: &L,
534 pending_events: &Mutex<Vec<events::Event>>, send_payment_along_path: SP
535 ) -> Result<PaymentHash, RetryableSendFailure>
538 ES::Target: EntropySource,
539 NS::Target: NodeSigner,
541 IH: Fn() -> InFlightHtlcs,
542 SP: Fn(&Vec<RouteHop>, &PaymentHash, RecipientOnionFields, u64, u32, PaymentId,
543 &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>,
545 let preimage = payment_preimage
546 .unwrap_or_else(|| PaymentPreimage(entropy_source.get_secure_random_bytes()));
547 let payment_hash = PaymentHash(Sha256::hash(&preimage.0).into_inner());
548 self.send_payment_internal(payment_id, payment_hash, recipient_onion, Some(preimage),
549 retry_strategy, route_params, router, first_hops, inflight_htlcs, entropy_source,
550 node_signer, best_block_height, logger, pending_events, send_payment_along_path)
551 .map(|()| payment_hash)
554 pub(super) fn send_spontaneous_payment_with_route<ES: Deref, NS: Deref, F>(
555 &self, route: &Route, payment_preimage: Option<PaymentPreimage>,
556 recipient_onion: RecipientOnionFields, payment_id: PaymentId, entropy_source: &ES,
557 node_signer: &NS, best_block_height: u32, send_payment_along_path: F
558 ) -> Result<PaymentHash, PaymentSendFailure>
560 ES::Target: EntropySource,
561 NS::Target: NodeSigner,
562 F: Fn(&Vec<RouteHop>, &PaymentHash, RecipientOnionFields, u64, u32, PaymentId,
563 &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
565 let preimage = payment_preimage
566 .unwrap_or_else(|| PaymentPreimage(entropy_source.get_secure_random_bytes()));
567 let payment_hash = PaymentHash(Sha256::hash(&preimage.0).into_inner());
568 let onion_session_privs = self.add_new_pending_payment(payment_hash, recipient_onion.clone(),
569 payment_id, Some(preimage), &route, None, None, entropy_source, best_block_height)?;
571 match self.pay_route_internal(route, payment_hash, recipient_onion, Some(preimage),
572 payment_id, None, onion_session_privs, node_signer, best_block_height, &send_payment_along_path
574 Ok(()) => Ok(payment_hash),
576 self.remove_outbound_if_all_failed(payment_id, &e);
582 pub(super) fn check_retry_payments<R: Deref, ES: Deref, NS: Deref, SP, IH, FH, L: Deref>(
583 &self, router: &R, first_hops: FH, inflight_htlcs: IH, entropy_source: &ES, node_signer: &NS,
584 best_block_height: u32, pending_events: &Mutex<Vec<events::Event>>, logger: &L,
585 send_payment_along_path: SP,
589 ES::Target: EntropySource,
590 NS::Target: NodeSigner,
591 SP: Fn(&Vec<RouteHop>, &PaymentHash, RecipientOnionFields, u64, u32, PaymentId,
592 &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>,
593 IH: Fn() -> InFlightHtlcs,
594 FH: Fn() -> Vec<ChannelDetails>,
597 let _single_thread = self.retry_lock.lock().unwrap();
599 let mut outbounds = self.pending_outbound_payments.lock().unwrap();
600 let mut retry_id_route_params = None;
601 for (pmt_id, pmt) in outbounds.iter_mut() {
602 if pmt.is_auto_retryable_now() {
603 if let PendingOutboundPayment::Retryable { pending_amt_msat, total_msat, payment_params: Some(params), payment_hash, .. } = pmt {
604 if pending_amt_msat < total_msat {
605 retry_id_route_params = Some((*payment_hash, *pmt_id, RouteParameters {
606 final_value_msat: *total_msat - *pending_amt_msat,
607 payment_params: params.clone(),
611 } else { debug_assert!(false); }
614 core::mem::drop(outbounds);
615 if let Some((payment_hash, payment_id, route_params)) = retry_id_route_params {
616 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)
620 let mut outbounds = self.pending_outbound_payments.lock().unwrap();
621 outbounds.retain(|pmt_id, pmt| {
622 let mut retain = true;
623 if !pmt.is_auto_retryable_now() && pmt.remaining_parts() == 0 {
624 if pmt.mark_abandoned().is_ok() {
625 pending_events.lock().unwrap().push(events::Event::PaymentFailed {
627 payment_hash: pmt.payment_hash().expect("PendingOutboundPayments::Retryable always has a payment hash set"),
636 pub(super) fn needs_abandon(&self) -> bool {
637 let outbounds = self.pending_outbound_payments.lock().unwrap();
638 outbounds.iter().any(|(_, pmt)|
639 !pmt.is_auto_retryable_now() && pmt.remaining_parts() == 0 && !pmt.is_fulfilled())
642 /// Errors immediately on [`RetryableSendFailure`] error conditions. Otherwise, further errors may
643 /// be surfaced asynchronously via [`Event::PaymentPathFailed`] and [`Event::PaymentFailed`].
645 /// [`Event::PaymentPathFailed`]: crate::events::Event::PaymentPathFailed
646 /// [`Event::PaymentFailed`]: crate::events::Event::PaymentFailed
647 fn send_payment_internal<R: Deref, NS: Deref, ES: Deref, IH, SP, L: Deref>(
648 &self, payment_id: PaymentId, payment_hash: PaymentHash, recipient_onion: RecipientOnionFields,
649 keysend_preimage: Option<PaymentPreimage>, retry_strategy: Retry, route_params: RouteParameters,
650 router: &R, first_hops: Vec<ChannelDetails>, inflight_htlcs: IH, entropy_source: &ES,
651 node_signer: &NS, best_block_height: u32, logger: &L,
652 pending_events: &Mutex<Vec<events::Event>>, send_payment_along_path: SP,
653 ) -> Result<(), RetryableSendFailure>
656 ES::Target: EntropySource,
657 NS::Target: NodeSigner,
659 IH: Fn() -> InFlightHtlcs,
660 SP: Fn(&Vec<RouteHop>, &PaymentHash, RecipientOnionFields, u64, u32, PaymentId,
661 &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
663 #[cfg(feature = "std")] {
664 if has_expired(&route_params) {
665 return Err(RetryableSendFailure::PaymentExpired)
669 let route = router.find_route_with_id(
670 &node_signer.get_node_id(Recipient::Node).unwrap(), &route_params,
671 Some(&first_hops.iter().collect::<Vec<_>>()), &inflight_htlcs(),
672 payment_hash, payment_id,
673 ).map_err(|_| RetryableSendFailure::RouteNotFound)?;
675 let onion_session_privs = self.add_new_pending_payment(payment_hash,
676 recipient_onion.clone(), payment_id, keysend_preimage, &route, Some(retry_strategy),
677 Some(route_params.payment_params.clone()), entropy_source, best_block_height)
678 .map_err(|_| RetryableSendFailure::DuplicatePayment)?;
680 let res = self.pay_route_internal(&route, payment_hash, recipient_onion, None, payment_id, None,
681 onion_session_privs, node_signer, best_block_height, &send_payment_along_path);
682 log_info!(logger, "Result sending payment with id {}: {:?}", log_bytes!(payment_id.0), res);
683 if let Err(e) = res {
684 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);
689 fn retry_payment_internal<R: Deref, NS: Deref, ES: Deref, IH, SP, L: Deref>(
690 &self, payment_hash: PaymentHash, payment_id: PaymentId, route_params: RouteParameters,
691 router: &R, first_hops: Vec<ChannelDetails>, inflight_htlcs: &IH, entropy_source: &ES,
692 node_signer: &NS, best_block_height: u32, logger: &L,
693 pending_events: &Mutex<Vec<events::Event>>, send_payment_along_path: &SP,
697 ES::Target: EntropySource,
698 NS::Target: NodeSigner,
700 IH: Fn() -> InFlightHtlcs,
701 SP: Fn(&Vec<RouteHop>, &PaymentHash, RecipientOnionFields, u64, u32, PaymentId,
702 &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
704 #[cfg(feature = "std")] {
705 if has_expired(&route_params) {
706 log_error!(logger, "Payment params expired on retry, abandoning payment {}", log_bytes!(payment_id.0));
707 self.abandon_payment(payment_id, pending_events);
712 let route = match router.find_route_with_id(
713 &node_signer.get_node_id(Recipient::Node).unwrap(), &route_params,
714 Some(&first_hops.iter().collect::<Vec<_>>()), &inflight_htlcs(),
715 payment_hash, payment_id,
719 log_error!(logger, "Failed to find a route on retry, abandoning payment {}: {:#?}", log_bytes!(payment_id.0), e);
720 self.abandon_payment(payment_id, pending_events);
724 for path in route.paths.iter() {
726 log_error!(logger, "length-0 path in route");
727 self.abandon_payment(payment_id, pending_events);
732 const RETRY_OVERFLOW_PERCENTAGE: u64 = 10;
733 let mut onion_session_privs = Vec::with_capacity(route.paths.len());
734 for _ in 0..route.paths.len() {
735 onion_session_privs.push(entropy_source.get_secure_random_bytes());
738 macro_rules! abandon_with_entry {
739 ($payment: expr) => {
740 if $payment.get_mut().mark_abandoned().is_ok() && $payment.get().remaining_parts() == 0 {
741 pending_events.lock().unwrap().push(events::Event::PaymentFailed {
749 let (total_msat, recipient_onion, keysend_preimage) = {
750 let mut outbounds = self.pending_outbound_payments.lock().unwrap();
751 match outbounds.entry(payment_id) {
752 hash_map::Entry::Occupied(mut payment) => {
753 let res = match payment.get() {
754 PendingOutboundPayment::Retryable {
755 total_msat, keysend_preimage, payment_secret, payment_metadata, pending_amt_msat, ..
757 let retry_amt_msat: u64 = route.paths.iter().map(|path| path.last().unwrap().fee_msat).sum();
758 if retry_amt_msat + *pending_amt_msat > *total_msat * (100 + RETRY_OVERFLOW_PERCENTAGE) / 100 {
759 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);
760 abandon_with_entry!(payment);
763 (*total_msat, RecipientOnionFields {
764 payment_secret: *payment_secret,
765 payment_metadata: payment_metadata.clone(),
766 }, *keysend_preimage)
768 PendingOutboundPayment::Legacy { .. } => {
769 log_error!(logger, "Unable to retry payments that were initially sent on LDK versions prior to 0.0.102");
772 PendingOutboundPayment::Fulfilled { .. } => {
773 log_error!(logger, "Payment already completed");
776 PendingOutboundPayment::Abandoned { .. } => {
777 log_error!(logger, "Payment already abandoned (with some HTLCs still pending)");
781 if !payment.get().is_retryable_now() {
782 log_error!(logger, "Retries exhausted for payment id {}", log_bytes!(payment_id.0));
783 abandon_with_entry!(payment);
786 payment.get_mut().increment_attempts();
787 for (path, session_priv_bytes) in route.paths.iter().zip(onion_session_privs.iter()) {
788 assert!(payment.get_mut().insert(*session_priv_bytes, path));
792 hash_map::Entry::Vacant(_) => {
793 log_error!(logger, "Payment with ID {} not found", log_bytes!(payment_id.0));
798 let res = self.pay_route_internal(&route, payment_hash, recipient_onion, keysend_preimage,
799 payment_id, Some(total_msat), onion_session_privs, node_signer, best_block_height,
800 &send_payment_along_path);
801 log_info!(logger, "Result retrying payment id {}: {:?}", log_bytes!(payment_id.0), res);
802 if let Err(e) = res {
803 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);
807 fn handle_pay_route_err<R: Deref, NS: Deref, ES: Deref, IH, SP, L: Deref>(
808 &self, err: PaymentSendFailure, payment_id: PaymentId, payment_hash: PaymentHash, route: Route,
809 mut route_params: RouteParameters, router: &R, first_hops: Vec<ChannelDetails>,
810 inflight_htlcs: &IH, entropy_source: &ES, node_signer: &NS, best_block_height: u32, logger: &L,
811 pending_events: &Mutex<Vec<events::Event>>, send_payment_along_path: &SP,
815 ES::Target: EntropySource,
816 NS::Target: NodeSigner,
818 IH: Fn() -> InFlightHtlcs,
819 SP: Fn(&Vec<RouteHop>, &PaymentHash, RecipientOnionFields, u64, u32, PaymentId,
820 &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
823 PaymentSendFailure::AllFailedResendSafe(errs) => {
824 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);
825 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);
827 PaymentSendFailure::PartialFailure { failed_paths_retry: Some(mut retry), results, .. } => {
828 Self::push_path_failed_evs_and_scids(payment_id, payment_hash, &mut retry, route.paths, results.into_iter(), pending_events);
829 // Some paths were sent, even if we failed to send the full MPP value our recipient may
830 // misbehave and claim the funds, at which point we have to consider the payment sent, so
831 // return `Ok()` here, ignoring any retry errors.
832 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);
834 PaymentSendFailure::PartialFailure { failed_paths_retry: None, .. } => {
835 // This may happen if we send a payment and some paths fail, but only due to a temporary
836 // monitor failure or the like, implying they're really in-flight, but we haven't sent the
837 // initial HTLC-Add messages yet.
839 PaymentSendFailure::PathParameterError(results) => {
840 Self::push_path_failed_evs_and_scids(payment_id, payment_hash, &mut route_params, route.paths, results.into_iter(), pending_events);
841 self.abandon_payment(payment_id, pending_events);
843 PaymentSendFailure::ParameterError(e) => {
844 log_error!(logger, "Failed to send to route due to parameter error: {:?}. Your router is buggy", e);
845 self.abandon_payment(payment_id, pending_events);
847 PaymentSendFailure::DuplicatePayment => debug_assert!(false), // unreachable
851 fn push_path_failed_evs_and_scids<I: ExactSizeIterator + Iterator<Item = Result<(), APIError>>>(
852 payment_id: PaymentId, payment_hash: PaymentHash, route_params: &mut RouteParameters,
853 paths: Vec<Vec<RouteHop>>, path_results: I, pending_events: &Mutex<Vec<events::Event>>
855 let mut events = pending_events.lock().unwrap();
856 debug_assert_eq!(paths.len(), path_results.len());
857 for (path, path_res) in paths.into_iter().zip(path_results) {
858 if let Err(e) = path_res {
859 if let APIError::MonitorUpdateInProgress = e { continue }
860 let mut failed_scid = None;
861 if let APIError::ChannelUnavailable { .. } = e {
862 let scid = path[0].short_channel_id;
863 failed_scid = Some(scid);
864 route_params.payment_params.previously_failed_channels.push(scid);
866 events.push(events::Event::PaymentPathFailed {
867 payment_id: Some(payment_id),
869 payment_failed_permanently: false,
870 failure: events::PathFailure::InitialSend { err: e },
872 short_channel_id: failed_scid,
882 pub(super) fn send_probe<ES: Deref, NS: Deref, F>(
883 &self, hops: Vec<RouteHop>, probing_cookie_secret: [u8; 32], entropy_source: &ES,
884 node_signer: &NS, best_block_height: u32, send_payment_along_path: F
885 ) -> Result<(PaymentHash, PaymentId), PaymentSendFailure>
887 ES::Target: EntropySource,
888 NS::Target: NodeSigner,
889 F: Fn(&Vec<RouteHop>, &PaymentHash, RecipientOnionFields, u64, u32, PaymentId,
890 &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
892 let payment_id = PaymentId(entropy_source.get_secure_random_bytes());
894 let payment_hash = probing_cookie_from_id(&payment_id, probing_cookie_secret);
897 return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
898 err: "No need probing a path with less than two hops".to_string()
902 let route = Route { paths: vec![hops], payment_params: None };
903 let onion_session_privs = self.add_new_pending_payment(payment_hash,
904 RecipientOnionFields::spontaneous_empty(), payment_id, None, &route, None, None,
905 entropy_source, best_block_height)?;
907 match self.pay_route_internal(&route, payment_hash, RecipientOnionFields::spontaneous_empty(),
908 None, payment_id, None, onion_session_privs, node_signer, best_block_height, &send_payment_along_path
910 Ok(()) => Ok((payment_hash, payment_id)),
912 self.remove_outbound_if_all_failed(payment_id, &e);
919 pub(super) fn test_add_new_pending_payment<ES: Deref>(
920 &self, payment_hash: PaymentHash, recipient_onion: RecipientOnionFields, payment_id: PaymentId,
921 route: &Route, retry_strategy: Option<Retry>, entropy_source: &ES, best_block_height: u32
922 ) -> Result<Vec<[u8; 32]>, PaymentSendFailure> where ES::Target: EntropySource {
923 self.add_new_pending_payment(payment_hash, recipient_onion, payment_id, None, route, retry_strategy, None, entropy_source, best_block_height)
926 pub(super) fn add_new_pending_payment<ES: Deref>(
927 &self, payment_hash: PaymentHash, recipient_onion: RecipientOnionFields, payment_id: PaymentId,
928 keysend_preimage: Option<PaymentPreimage>, route: &Route, retry_strategy: Option<Retry>,
929 payment_params: Option<PaymentParameters>, entropy_source: &ES, best_block_height: u32
930 ) -> Result<Vec<[u8; 32]>, PaymentSendFailure> where ES::Target: EntropySource {
931 let mut onion_session_privs = Vec::with_capacity(route.paths.len());
932 for _ in 0..route.paths.len() {
933 onion_session_privs.push(entropy_source.get_secure_random_bytes());
936 let mut pending_outbounds = self.pending_outbound_payments.lock().unwrap();
937 match pending_outbounds.entry(payment_id) {
938 hash_map::Entry::Occupied(_) => Err(PaymentSendFailure::DuplicatePayment),
939 hash_map::Entry::Vacant(entry) => {
940 let payment = entry.insert(PendingOutboundPayment::Retryable {
942 attempts: PaymentAttempts::new(),
944 session_privs: HashSet::new(),
946 pending_fee_msat: Some(0),
948 payment_secret: recipient_onion.payment_secret,
949 payment_metadata: recipient_onion.payment_metadata,
951 starting_block_height: best_block_height,
952 total_msat: route.get_total_amount(),
955 for (path, session_priv_bytes) in route.paths.iter().zip(onion_session_privs.iter()) {
956 assert!(payment.insert(*session_priv_bytes, path));
959 Ok(onion_session_privs)
964 fn pay_route_internal<NS: Deref, F>(
965 &self, route: &Route, payment_hash: PaymentHash, recipient_onion: RecipientOnionFields,
966 keysend_preimage: Option<PaymentPreimage>, payment_id: PaymentId, recv_value_msat: Option<u64>,
967 onion_session_privs: Vec<[u8; 32]>, node_signer: &NS, best_block_height: u32,
968 send_payment_along_path: &F
969 ) -> Result<(), PaymentSendFailure>
971 NS::Target: NodeSigner,
972 F: Fn(&Vec<RouteHop>, &PaymentHash, RecipientOnionFields, u64, u32, PaymentId,
973 &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
975 if route.paths.len() < 1 {
976 return Err(PaymentSendFailure::ParameterError(APIError::InvalidRoute{err: "There must be at least one path to send over".to_owned()}));
978 if recipient_onion.payment_secret.is_none() && route.paths.len() > 1 {
979 return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError{err: "Payment secret is required for multi-path payments".to_owned()}));
981 let mut total_value = 0;
982 let our_node_id = node_signer.get_node_id(Recipient::Node).unwrap(); // TODO no unwrap
983 let mut path_errs = Vec::with_capacity(route.paths.len());
984 'path_check: for path in route.paths.iter() {
985 if path.len() < 1 || path.len() > 20 {
986 path_errs.push(Err(APIError::InvalidRoute{err: "Path didn't go anywhere/had bogus size".to_owned()}));
987 continue 'path_check;
989 for (idx, hop) in path.iter().enumerate() {
990 if idx != path.len() - 1 && hop.pubkey == our_node_id {
991 path_errs.push(Err(APIError::InvalidRoute{err: "Path went through us but wasn't a simple rebalance loop to us".to_owned()}));
992 continue 'path_check;
995 total_value += path.last().unwrap().fee_msat;
996 path_errs.push(Ok(()));
998 if path_errs.iter().any(|e| e.is_err()) {
999 return Err(PaymentSendFailure::PathParameterError(path_errs));
1001 if let Some(amt_msat) = recv_value_msat {
1002 total_value = amt_msat;
1005 let cur_height = best_block_height + 1;
1006 let mut results = Vec::new();
1007 debug_assert_eq!(route.paths.len(), onion_session_privs.len());
1008 for (path, session_priv) in route.paths.iter().zip(onion_session_privs.into_iter()) {
1009 let mut path_res = send_payment_along_path(&path, &payment_hash, recipient_onion.clone(),
1010 total_value, cur_height, payment_id, &keysend_preimage, session_priv);
1013 Err(APIError::MonitorUpdateInProgress) => {
1014 // While a MonitorUpdateInProgress is an Err(_), the payment is still
1015 // considered "in flight" and we shouldn't remove it from the
1016 // PendingOutboundPayment set.
1019 let mut pending_outbounds = self.pending_outbound_payments.lock().unwrap();
1020 if let Some(payment) = pending_outbounds.get_mut(&payment_id) {
1021 let removed = payment.remove(&session_priv, Some(path));
1022 debug_assert!(removed, "This can't happen as the payment has an entry for this path added by callers");
1024 debug_assert!(false, "This can't happen as the payment was added by callers");
1025 path_res = Err(APIError::APIMisuseError { err: "Internal error: payment disappeared during processing. Please report this bug!".to_owned() });
1029 results.push(path_res);
1031 let mut has_ok = false;
1032 let mut has_err = false;
1033 let mut pending_amt_unsent = 0;
1034 let mut max_unsent_cltv_delta = 0;
1035 for (res, path) in results.iter().zip(route.paths.iter()) {
1036 if res.is_ok() { has_ok = true; }
1037 if res.is_err() { has_err = true; }
1038 if let &Err(APIError::MonitorUpdateInProgress) = res {
1039 // MonitorUpdateInProgress is inherently unsafe to retry, so we call it a
1043 } else if res.is_err() {
1044 pending_amt_unsent += path.last().unwrap().fee_msat;
1045 max_unsent_cltv_delta = cmp::max(max_unsent_cltv_delta, path.last().unwrap().cltv_expiry_delta);
1048 if has_err && has_ok {
1049 Err(PaymentSendFailure::PartialFailure {
1052 failed_paths_retry: if pending_amt_unsent != 0 {
1053 if let Some(payment_params) = &route.payment_params {
1054 Some(RouteParameters {
1055 payment_params: payment_params.clone(),
1056 final_value_msat: pending_amt_unsent,
1062 Err(PaymentSendFailure::AllFailedResendSafe(results.drain(..).map(|r| r.unwrap_err()).collect()))
1069 pub(super) fn test_send_payment_internal<NS: Deref, F>(
1070 &self, route: &Route, payment_hash: PaymentHash, recipient_onion: RecipientOnionFields,
1071 keysend_preimage: Option<PaymentPreimage>, payment_id: PaymentId, recv_value_msat: Option<u64>,
1072 onion_session_privs: Vec<[u8; 32]>, node_signer: &NS, best_block_height: u32,
1073 send_payment_along_path: F
1074 ) -> Result<(), PaymentSendFailure>
1076 NS::Target: NodeSigner,
1077 F: Fn(&Vec<RouteHop>, &PaymentHash, RecipientOnionFields, u64, u32, PaymentId,
1078 &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
1080 self.pay_route_internal(route, payment_hash, recipient_onion, keysend_preimage, payment_id,
1081 recv_value_msat, onion_session_privs, node_signer, best_block_height,
1082 &send_payment_along_path)
1083 .map_err(|e| { self.remove_outbound_if_all_failed(payment_id, &e); e })
1086 // If we failed to send any paths, remove the new PaymentId from the `pending_outbound_payments`
1087 // map as the payment is free to be resent.
1088 fn remove_outbound_if_all_failed(&self, payment_id: PaymentId, err: &PaymentSendFailure) {
1089 if let &PaymentSendFailure::AllFailedResendSafe(_) = err {
1090 let removed = self.pending_outbound_payments.lock().unwrap().remove(&payment_id).is_some();
1091 debug_assert!(removed, "We should always have a pending payment to remove here");
1095 pub(super) fn claim_htlc<L: Deref>(
1096 &self, payment_id: PaymentId, payment_preimage: PaymentPreimage, session_priv: SecretKey,
1097 path: Vec<RouteHop>, from_onchain: bool, pending_events: &Mutex<Vec<events::Event>>, logger: &L
1098 ) where L::Target: Logger {
1099 let mut session_priv_bytes = [0; 32];
1100 session_priv_bytes.copy_from_slice(&session_priv[..]);
1101 let mut outbounds = self.pending_outbound_payments.lock().unwrap();
1102 let mut pending_events = pending_events.lock().unwrap();
1103 if let hash_map::Entry::Occupied(mut payment) = outbounds.entry(payment_id) {
1104 if !payment.get().is_fulfilled() {
1105 let payment_hash = PaymentHash(Sha256::hash(&payment_preimage.0).into_inner());
1106 let fee_paid_msat = payment.get().get_pending_fee_msat();
1107 pending_events.push(
1108 events::Event::PaymentSent {
1109 payment_id: Some(payment_id),
1115 payment.get_mut().mark_fulfilled();
1119 // We currently immediately remove HTLCs which were fulfilled on-chain.
1120 // This could potentially lead to removing a pending payment too early,
1121 // with a reorg of one block causing us to re-add the fulfilled payment on
1123 // TODO: We should have a second monitor event that informs us of payments
1124 // irrevocably fulfilled.
1125 if payment.get_mut().remove(&session_priv_bytes, Some(&path)) {
1126 let payment_hash = Some(PaymentHash(Sha256::hash(&payment_preimage.0).into_inner()));
1127 pending_events.push(
1128 events::Event::PaymentPathSuccessful {
1137 log_trace!(logger, "Received duplicative fulfill for HTLC with payment_preimage {}", log_bytes!(payment_preimage.0));
1141 pub(super) fn finalize_claims(&self, sources: Vec<HTLCSource>, pending_events: &Mutex<Vec<events::Event>>) {
1142 let mut outbounds = self.pending_outbound_payments.lock().unwrap();
1143 let mut pending_events = pending_events.lock().unwrap();
1144 for source in sources {
1145 if let HTLCSource::OutboundRoute { session_priv, payment_id, path, .. } = source {
1146 let mut session_priv_bytes = [0; 32];
1147 session_priv_bytes.copy_from_slice(&session_priv[..]);
1148 if let hash_map::Entry::Occupied(mut payment) = outbounds.entry(payment_id) {
1149 assert!(payment.get().is_fulfilled());
1150 if payment.get_mut().remove(&session_priv_bytes, None) {
1151 pending_events.push(
1152 events::Event::PaymentPathSuccessful {
1154 payment_hash: payment.get().payment_hash(),
1164 pub(super) fn remove_stale_resolved_payments(&self, pending_events: &Mutex<Vec<events::Event>>) {
1165 // If an outbound payment was completed, and no pending HTLCs remain, we should remove it
1166 // from the map. However, if we did that immediately when the last payment HTLC is claimed,
1167 // this could race the user making a duplicate send_payment call and our idempotency
1168 // guarantees would be violated. Instead, we wait a few timer ticks to do the actual
1169 // removal. This should be more than sufficient to ensure the idempotency of any
1170 // `send_payment` calls that were made at the same time the `PaymentSent` event was being
1172 let mut pending_outbound_payments = self.pending_outbound_payments.lock().unwrap();
1173 let pending_events = pending_events.lock().unwrap();
1174 pending_outbound_payments.retain(|payment_id, payment| {
1175 if let PendingOutboundPayment::Fulfilled { session_privs, timer_ticks_without_htlcs, .. } = payment {
1176 let mut no_remaining_entries = session_privs.is_empty();
1177 if no_remaining_entries {
1178 for ev in pending_events.iter() {
1180 events::Event::PaymentSent { payment_id: Some(ev_payment_id), .. } |
1181 events::Event::PaymentPathSuccessful { payment_id: ev_payment_id, .. } |
1182 events::Event::PaymentPathFailed { payment_id: Some(ev_payment_id), .. } => {
1183 if payment_id == ev_payment_id {
1184 no_remaining_entries = false;
1192 if no_remaining_entries {
1193 *timer_ticks_without_htlcs += 1;
1194 *timer_ticks_without_htlcs <= IDEMPOTENCY_TIMEOUT_TICKS
1196 *timer_ticks_without_htlcs = 0;
1203 // Returns a bool indicating whether a PendingHTLCsForwardable event should be generated.
1204 pub(super) fn fail_htlc<L: Deref>(
1205 &self, source: &HTLCSource, payment_hash: &PaymentHash, onion_error: &HTLCFailReason,
1206 path: &Vec<RouteHop>, session_priv: &SecretKey, payment_id: &PaymentId,
1207 probing_cookie_secret: [u8; 32], secp_ctx: &Secp256k1<secp256k1::All>,
1208 pending_events: &Mutex<Vec<events::Event>>, logger: &L
1209 ) -> bool where L::Target: Logger {
1211 let (network_update, short_channel_id, payment_retryable, onion_error_code, onion_error_data) = onion_error.decode_onion_failure(secp_ctx, logger, &source);
1213 let (network_update, short_channel_id, payment_retryable, _, _) = onion_error.decode_onion_failure(secp_ctx, logger, &source);
1215 let payment_is_probe = payment_is_probe(payment_hash, &payment_id, probing_cookie_secret);
1216 let mut session_priv_bytes = [0; 32];
1217 session_priv_bytes.copy_from_slice(&session_priv[..]);
1218 let mut outbounds = self.pending_outbound_payments.lock().unwrap();
1220 // If any payments already need retry, there's no need to generate a redundant
1221 // `PendingHTLCsForwardable`.
1222 let already_awaiting_retry = outbounds.iter().any(|(_, pmt)| {
1223 let mut awaiting_retry = false;
1224 if pmt.is_auto_retryable_now() {
1225 if let PendingOutboundPayment::Retryable { pending_amt_msat, total_msat, .. } = pmt {
1226 if pending_amt_msat < total_msat {
1227 awaiting_retry = true;
1234 let mut full_failure_ev = None;
1235 let mut pending_retry_ev = false;
1236 let attempts_remaining = if let hash_map::Entry::Occupied(mut payment) = outbounds.entry(*payment_id) {
1237 if !payment.get_mut().remove(&session_priv_bytes, Some(&path)) {
1238 log_trace!(logger, "Received duplicative fail for HTLC with payment_hash {}", log_bytes!(payment_hash.0));
1241 if payment.get().is_fulfilled() {
1242 log_trace!(logger, "Received failure of HTLC with payment_hash {} after payment completion", log_bytes!(payment_hash.0));
1245 let mut is_retryable_now = payment.get().is_auto_retryable_now();
1246 if let Some(scid) = short_channel_id {
1247 // TODO: If we decided to blame ourselves (or one of our channels) in
1248 // process_onion_failure we should close that channel as it implies our
1249 // next-hop is needlessly blaming us!
1250 payment.get_mut().insert_previously_failed_scid(scid);
1253 if payment_is_probe || !is_retryable_now || !payment_retryable {
1254 let _ = payment.get_mut().mark_abandoned(); // we'll only Err if it's a legacy payment
1255 is_retryable_now = false;
1257 if payment.get().remaining_parts() == 0 {
1258 if payment.get().abandoned() {
1259 if !payment_is_probe {
1260 full_failure_ev = Some(events::Event::PaymentFailed {
1261 payment_id: *payment_id,
1262 payment_hash: payment.get().payment_hash().expect("PendingOutboundPayments::RetriesExceeded always has a payment hash set"),
1270 log_trace!(logger, "Received duplicative fail for HTLC with payment_hash {}", log_bytes!(payment_hash.0));
1273 core::mem::drop(outbounds);
1274 log_trace!(logger, "Failing outbound payment HTLC with payment_hash {}", log_bytes!(payment_hash.0));
1276 let path_failure = {
1277 if payment_is_probe {
1278 if !payment_retryable {
1279 events::Event::ProbeSuccessful {
1280 payment_id: *payment_id,
1281 payment_hash: payment_hash.clone(),
1285 events::Event::ProbeFailed {
1286 payment_id: *payment_id,
1287 payment_hash: payment_hash.clone(),
1293 // If we miss abandoning the payment above, we *must* generate an event here or else the
1294 // payment will sit in our outbounds forever.
1295 if attempts_remaining && !already_awaiting_retry {
1296 debug_assert!(full_failure_ev.is_none());
1297 pending_retry_ev = true;
1299 events::Event::PaymentPathFailed {
1300 payment_id: Some(*payment_id),
1301 payment_hash: payment_hash.clone(),
1302 payment_failed_permanently: !payment_retryable,
1303 failure: events::PathFailure::OnPath { network_update },
1307 error_code: onion_error_code,
1309 error_data: onion_error_data
1313 let mut pending_events = pending_events.lock().unwrap();
1314 pending_events.push(path_failure);
1315 if let Some(ev) = full_failure_ev { pending_events.push(ev); }
1319 pub(super) fn abandon_payment(
1320 &self, payment_id: PaymentId, pending_events: &Mutex<Vec<events::Event>>
1322 let mut outbounds = self.pending_outbound_payments.lock().unwrap();
1323 if let hash_map::Entry::Occupied(mut payment) = outbounds.entry(payment_id) {
1324 if let Ok(()) = payment.get_mut().mark_abandoned() {
1325 if payment.get().remaining_parts() == 0 {
1326 pending_events.lock().unwrap().push(events::Event::PaymentFailed {
1328 payment_hash: payment.get().payment_hash().expect("PendingOutboundPayments::RetriesExceeded always has a payment hash set"),
1337 pub fn has_pending_payments(&self) -> bool {
1338 !self.pending_outbound_payments.lock().unwrap().is_empty()
1342 pub fn clear_pending_payments(&self) {
1343 self.pending_outbound_payments.lock().unwrap().clear()
1347 /// Returns whether a payment with the given [`PaymentHash`] and [`PaymentId`] is, in fact, a
1349 pub(super) fn payment_is_probe(payment_hash: &PaymentHash, payment_id: &PaymentId,
1350 probing_cookie_secret: [u8; 32]) -> bool
1352 let target_payment_hash = probing_cookie_from_id(payment_id, probing_cookie_secret);
1353 target_payment_hash == *payment_hash
1356 /// Returns the 'probing cookie' for the given [`PaymentId`].
1357 fn probing_cookie_from_id(payment_id: &PaymentId, probing_cookie_secret: [u8; 32]) -> PaymentHash {
1358 let mut preimage = [0u8; 64];
1359 preimage[..32].copy_from_slice(&probing_cookie_secret);
1360 preimage[32..].copy_from_slice(&payment_id.0);
1361 PaymentHash(Sha256::hash(&preimage).into_inner())
1364 impl_writeable_tlv_based_enum_upgradable!(PendingOutboundPayment,
1366 (0, session_privs, required),
1369 (0, session_privs, required),
1370 (1, payment_hash, option),
1371 (3, timer_ticks_without_htlcs, (default_value, 0)),
1374 (0, session_privs, required),
1375 (1, pending_fee_msat, option),
1376 (2, payment_hash, required),
1377 // Note that while we "default" payment_param's final CLTV expiry delta to 0 we should
1378 // never see it - `payment_params` was added here after the field was added/required.
1379 (3, payment_params, (option: ReadableArgs, 0)),
1380 (4, payment_secret, option),
1381 (5, keysend_preimage, option),
1382 (6, total_msat, required),
1383 (7, payment_metadata, option),
1384 (8, pending_amt_msat, required),
1385 (10, starting_block_height, required),
1386 (not_written, retry_strategy, (static_value, None)),
1387 (not_written, attempts, (static_value, PaymentAttempts::new())),
1390 (0, session_privs, required),
1391 (2, payment_hash, required),
1397 use bitcoin::network::constants::Network;
1398 use bitcoin::secp256k1::{PublicKey, Secp256k1, SecretKey};
1400 use crate::events::{Event, PathFailure};
1401 use crate::ln::PaymentHash;
1402 use crate::ln::channelmanager::{PaymentId, RecipientOnionFields};
1403 use crate::ln::features::{ChannelFeatures, NodeFeatures};
1404 use crate::ln::msgs::{ErrorAction, LightningError};
1405 use crate::ln::outbound_payment::{OutboundPayments, Retry, RetryableSendFailure};
1406 use crate::routing::gossip::NetworkGraph;
1407 use crate::routing::router::{InFlightHtlcs, PaymentParameters, Route, RouteHop, RouteParameters};
1408 use crate::sync::{Arc, Mutex};
1409 use crate::util::errors::APIError;
1410 use crate::util::test_utils;
1413 #[cfg(feature = "std")]
1414 fn fails_paying_after_expiration() {
1415 do_fails_paying_after_expiration(false);
1416 do_fails_paying_after_expiration(true);
1418 #[cfg(feature = "std")]
1419 fn do_fails_paying_after_expiration(on_retry: bool) {
1420 let outbound_payments = OutboundPayments::new();
1421 let logger = test_utils::TestLogger::new();
1422 let network_graph = Arc::new(NetworkGraph::new(Network::Testnet, &logger));
1423 let scorer = Mutex::new(test_utils::TestScorer::new());
1424 let router = test_utils::TestRouter::new(network_graph, &scorer);
1425 let secp_ctx = Secp256k1::new();
1426 let keys_manager = test_utils::TestKeysInterface::new(&[0; 32], Network::Testnet);
1428 let past_expiry_time = std::time::SystemTime::UNIX_EPOCH.elapsed().unwrap().as_secs() - 2;
1429 let payment_params = PaymentParameters::from_node_id(
1430 PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap()),
1432 ).with_expiry_time(past_expiry_time);
1433 let expired_route_params = RouteParameters {
1435 final_value_msat: 0,
1437 let pending_events = Mutex::new(Vec::new());
1439 outbound_payments.add_new_pending_payment(PaymentHash([0; 32]), RecipientOnionFields::spontaneous_empty(),
1440 PaymentId([0; 32]), None, &Route { paths: vec![], payment_params: None },
1441 Some(Retry::Attempts(1)), Some(expired_route_params.payment_params.clone()),
1442 &&keys_manager, 0).unwrap();
1443 outbound_payments.retry_payment_internal(
1444 PaymentHash([0; 32]), PaymentId([0; 32]), expired_route_params, &&router, vec![],
1445 &|| InFlightHtlcs::new(), &&keys_manager, &&keys_manager, 0, &&logger,
1446 &pending_events, &|_, _, _, _, _, _, _, _| Ok(()));
1447 let events = pending_events.lock().unwrap();
1448 assert_eq!(events.len(), 1);
1449 if let Event::PaymentFailed { .. } = events[0] { } else { panic!("Unexpected event"); }
1451 let err = outbound_payments.send_payment(
1452 PaymentHash([0; 32]), RecipientOnionFields::spontaneous_empty(), PaymentId([0; 32]),
1453 Retry::Attempts(0), expired_route_params, &&router, vec![], || InFlightHtlcs::new(),
1454 &&keys_manager, &&keys_manager, 0, &&logger,
1455 &pending_events, |_, _, _, _, _, _, _, _| Ok(())).unwrap_err();
1456 if let RetryableSendFailure::PaymentExpired = err { } else { panic!("Unexpected error"); }
1461 fn find_route_error() {
1462 do_find_route_error(false);
1463 do_find_route_error(true);
1465 fn do_find_route_error(on_retry: bool) {
1466 let outbound_payments = OutboundPayments::new();
1467 let logger = test_utils::TestLogger::new();
1468 let network_graph = Arc::new(NetworkGraph::new(Network::Testnet, &logger));
1469 let scorer = Mutex::new(test_utils::TestScorer::new());
1470 let router = test_utils::TestRouter::new(network_graph, &scorer);
1471 let secp_ctx = Secp256k1::new();
1472 let keys_manager = test_utils::TestKeysInterface::new(&[0; 32], Network::Testnet);
1474 let payment_params = PaymentParameters::from_node_id(
1475 PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap()), 0);
1476 let route_params = RouteParameters {
1478 final_value_msat: 0,
1480 router.expect_find_route(route_params.clone(),
1481 Err(LightningError { err: String::new(), action: ErrorAction::IgnoreError }));
1483 let pending_events = Mutex::new(Vec::new());
1485 outbound_payments.add_new_pending_payment(PaymentHash([0; 32]), RecipientOnionFields::spontaneous_empty(),
1486 PaymentId([0; 32]), None, &Route { paths: vec![], payment_params: None },
1487 Some(Retry::Attempts(1)), Some(route_params.payment_params.clone()),
1488 &&keys_manager, 0).unwrap();
1489 outbound_payments.retry_payment_internal(
1490 PaymentHash([0; 32]), PaymentId([0; 32]), route_params, &&router, vec![],
1491 &|| InFlightHtlcs::new(), &&keys_manager, &&keys_manager, 0, &&logger,
1492 &pending_events, &|_, _, _, _, _, _, _, _| Ok(()));
1493 let events = pending_events.lock().unwrap();
1494 assert_eq!(events.len(), 1);
1495 if let Event::PaymentFailed { .. } = events[0] { } else { panic!("Unexpected event"); }
1497 let err = outbound_payments.send_payment(
1498 PaymentHash([0; 32]), RecipientOnionFields::spontaneous_empty(), PaymentId([0; 32]),
1499 Retry::Attempts(0), route_params, &&router, vec![], || InFlightHtlcs::new(),
1500 &&keys_manager, &&keys_manager, 0, &&logger,
1501 &pending_events, |_, _, _, _, _, _, _, _| Ok(())).unwrap_err();
1502 if let RetryableSendFailure::RouteNotFound = err {
1503 } else { panic!("Unexpected error"); }
1508 fn initial_send_payment_path_failed_evs() {
1509 let outbound_payments = OutboundPayments::new();
1510 let logger = test_utils::TestLogger::new();
1511 let network_graph = Arc::new(NetworkGraph::new(Network::Testnet, &logger));
1512 let scorer = Mutex::new(test_utils::TestScorer::new());
1513 let router = test_utils::TestRouter::new(network_graph, &scorer);
1514 let secp_ctx = Secp256k1::new();
1515 let keys_manager = test_utils::TestKeysInterface::new(&[0; 32], Network::Testnet);
1517 let sender_pk = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap());
1518 let receiver_pk = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[43; 32]).unwrap());
1519 let payment_params = PaymentParameters::from_node_id(sender_pk, 0);
1520 let route_params = RouteParameters {
1521 payment_params: payment_params.clone(),
1522 final_value_msat: 0,
1524 let failed_scid = 42;
1526 paths: vec![vec![RouteHop {
1527 pubkey: receiver_pk,
1528 node_features: NodeFeatures::empty(),
1529 short_channel_id: failed_scid,
1530 channel_features: ChannelFeatures::empty(),
1532 cltv_expiry_delta: 0,
1534 payment_params: Some(payment_params),
1536 router.expect_find_route(route_params.clone(), Ok(route.clone()));
1537 let mut route_params_w_failed_scid = route_params.clone();
1538 route_params_w_failed_scid.payment_params.previously_failed_channels.push(failed_scid);
1539 router.expect_find_route(route_params_w_failed_scid, Ok(route.clone()));
1540 router.expect_find_route(route_params.clone(), Ok(route.clone()));
1541 router.expect_find_route(route_params.clone(), Ok(route.clone()));
1543 // Ensure that a ChannelUnavailable error will result in blaming an scid in the
1544 // PaymentPathFailed event.
1545 let pending_events = Mutex::new(Vec::new());
1546 outbound_payments.send_payment(
1547 PaymentHash([0; 32]), RecipientOnionFields::spontaneous_empty(), PaymentId([0; 32]),
1548 Retry::Attempts(0), route_params.clone(), &&router, vec![], || InFlightHtlcs::new(),
1549 &&keys_manager, &&keys_manager, 0, &&logger, &pending_events,
1550 |_, _, _, _, _, _, _, _| Err(APIError::ChannelUnavailable { err: "test".to_owned() }))
1552 let mut events = pending_events.lock().unwrap();
1553 assert_eq!(events.len(), 2);
1554 if let Event::PaymentPathFailed {
1556 failure: PathFailure::InitialSend { err: APIError::ChannelUnavailable { .. }}, .. } = events[0]
1558 assert_eq!(short_channel_id, Some(failed_scid));
1559 } else { panic!("Unexpected event"); }
1560 if let Event::PaymentFailed { .. } = events[1] { } else { panic!("Unexpected event"); }
1562 core::mem::drop(events);
1564 // Ensure that a MonitorUpdateInProgress "error" will not result in a PaymentPathFailed event.
1565 outbound_payments.send_payment(
1566 PaymentHash([0; 32]), RecipientOnionFields::spontaneous_empty(), PaymentId([0; 32]),
1567 Retry::Attempts(0), route_params.clone(), &&router, vec![], || InFlightHtlcs::new(),
1568 &&keys_manager, &&keys_manager, 0, &&logger, &pending_events,
1569 |_, _, _, _, _, _, _, _| Err(APIError::MonitorUpdateInProgress)).unwrap();
1570 assert_eq!(pending_events.lock().unwrap().len(), 0);
1572 // Ensure that any other error will result in a PaymentPathFailed event but no blamed scid.
1573 outbound_payments.send_payment(
1574 PaymentHash([0; 32]), RecipientOnionFields::spontaneous_empty(), PaymentId([1; 32]),
1575 Retry::Attempts(0), route_params.clone(), &&router, vec![], || InFlightHtlcs::new(),
1576 &&keys_manager, &&keys_manager, 0, &&logger, &pending_events,
1577 |_, _, _, _, _, _, _, _| Err(APIError::APIMisuseError { err: "test".to_owned() }))
1579 let events = pending_events.lock().unwrap();
1580 assert_eq!(events.len(), 2);
1581 if let Event::PaymentPathFailed {
1583 failure: PathFailure::InitialSend { err: APIError::APIMisuseError { .. }}, .. } = events[0]
1585 assert_eq!(short_channel_id, None);
1586 } else { panic!("Unexpected event"); }
1587 if let Event::PaymentFailed { .. } = events[1] { } else { panic!("Unexpected event"); }