X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=lightning%2Fsrc%2Fln%2Foutbound_payment.rs;h=e1c5fa547f8ede6903c010c7c8fe846bfa45bf08;hb=12bcc9ae43a5f00d43551e42bac96eaff5933562;hp=b1b610bf8c9703445bea47aff84c4214bcd0852f;hpb=aa4b429eb213101f64a828dc80a6438912e8664e;p=rust-lightning diff --git a/lightning/src/ln/outbound_payment.rs b/lightning/src/ln/outbound_payment.rs index b1b610bf..e1c5fa54 100644 --- a/lightning/src/ln/outbound_payment.rs +++ b/lightning/src/ln/outbound_payment.rs @@ -15,7 +15,7 @@ use bitcoin::secp256k1::{self, Secp256k1, SecretKey}; use crate::chain::keysinterface::{EntropySource, NodeSigner, Recipient}; use crate::ln::{PaymentHash, PaymentPreimage, PaymentSecret}; -use crate::ln::channelmanager::{ChannelDetails, HTLCSource, IDEMPOTENCY_TIMEOUT_TICKS, MIN_HTLC_RELAY_HOLDING_CELL_MILLIS, PaymentId}; +use crate::ln::channelmanager::{ChannelDetails, HTLCSource, IDEMPOTENCY_TIMEOUT_TICKS, PaymentId}; use crate::ln::channelmanager::MIN_FINAL_CLTV_EXPIRY_DELTA as LDK_DEFAULT_MIN_FINAL_CLTV_EXPIRY_DELTA; use crate::ln::msgs::DecodeError; use crate::ln::onion_utils::HTLCFailReason; @@ -30,7 +30,6 @@ use crate::util::time::tests::SinceEpoch; use core::cmp; use core::fmt::{self, Display, Formatter}; use core::ops::Deref; -use core::time::Duration; use crate::prelude::*; use crate::sync::Mutex; @@ -65,13 +64,8 @@ pub(crate) enum PendingOutboundPayment { payment_hash: Option, timer_ticks_without_htlcs: u8, }, - /// When a payer gives up trying to retry a payment, they inform us, letting us generate a - /// `PaymentFailed` event when all HTLCs have irrevocably failed. This avoids a number of race - /// conditions in MPP-aware payment retriers (1), where the possibility of multiple - /// `PaymentPathFailed` events with `all_paths_failed` can be pending at once, confusing a - /// downstream event handler as to when a payment has actually failed. - /// - /// (1) + /// When we've decided to give up retrying a payment, we mark it as abandoned so we can eventually + /// generate a `PaymentFailed` event when all HTLCs have irrevocably failed. Abandoned { session_privs: HashSet<[u8; 32]>, payment_hash: PaymentHash, @@ -163,13 +157,13 @@ impl PendingOutboundPayment { let our_payment_hash; core::mem::swap(&mut session_privs, match self { PendingOutboundPayment::Legacy { .. } | - PendingOutboundPayment::Fulfilled { .. } => + PendingOutboundPayment::Fulfilled { .. } => return Err(()), - PendingOutboundPayment::Retryable { session_privs, payment_hash, .. } | - PendingOutboundPayment::Abandoned { session_privs, payment_hash, .. } => { - our_payment_hash = *payment_hash; - session_privs - }, + PendingOutboundPayment::Retryable { session_privs, payment_hash, .. } | + PendingOutboundPayment::Abandoned { session_privs, payment_hash, .. } => { + our_payment_hash = *payment_hash; + session_privs + }, }); *self = PendingOutboundPayment::Abandoned { session_privs, payment_hash: our_payment_hash }; Ok(()) @@ -313,9 +307,35 @@ impl Display for PaymentAttemptsUsingTime { } } -/// If a payment fails to send, it can be in one of several states. This enum is returned as the -/// Err() type describing which state the payment is in, see the description of individual enum -/// states for more. +/// Indicates an immediate error on [`ChannelManager::send_payment_with_retry`]. Further errors +/// may be surfaced later via [`Event::PaymentPathFailed`] and [`Event::PaymentFailed`]. +/// +/// [`ChannelManager::send_payment_with_retry`]: crate::ln::channelmanager::ChannelManager::send_payment_with_retry +/// [`Event::PaymentPathFailed`]: crate::util::events::Event::PaymentPathFailed +/// [`Event::PaymentFailed`]: crate::util::events::Event::PaymentFailed +#[derive(Clone, Debug)] +pub enum RetryableSendFailure { + /// The provided [`PaymentParameters::expiry_time`] indicated that the payment has expired. Note + /// that this error is *not* caused by [`Retry::Timeout`]. + /// + /// [`PaymentParameters::expiry_time`]: crate::routing::router::PaymentParameters::expiry_time + PaymentExpired, + /// We were unable to find a route to the destination. + RouteNotFound, + /// Indicates that a payment for the provided [`PaymentId`] is already in-flight and has not + /// yet completed (i.e. generated an [`Event::PaymentSent`] or [`Event::PaymentFailed`]). + /// + /// [`PaymentId`]: crate::ln::channelmanager::PaymentId + /// [`Event::PaymentSent`]: crate::util::events::Event::PaymentSent + /// [`Event::PaymentFailed`]: crate::util::events::Event::PaymentFailed + DuplicatePayment, +} + +/// If a payment fails to send with [`ChannelManager::send_payment`], it can be in one of several +/// states. This enum is returned as the Err() type describing which state the payment is in, see +/// the description of individual enum states for more. +/// +/// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment #[derive(Clone, Debug)] pub enum PaymentSendFailure { /// A parameter which was passed to send_payment was invalid, preventing us from attempting to @@ -323,68 +343,58 @@ pub enum PaymentSendFailure { /// /// You can freely resend the payment in full (with the parameter error fixed). /// - /// Because the payment failed outright, no payment tracking is done, you do not need to call - /// [`ChannelManager::abandon_payment`] and [`ChannelManager::retry_payment`] will *not* work - /// for this payment. + /// Because the payment failed outright, no payment tracking is done and no + /// [`Event::PaymentPathFailed`] or [`Event::PaymentFailed`] events will be generated. /// - /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment - /// [`ChannelManager::retry_payment`]: crate::ln::channelmanager::ChannelManager::retry_payment + /// [`Event::PaymentPathFailed`]: crate::util::events::Event::PaymentPathFailed + /// [`Event::PaymentFailed`]: crate::util::events::Event::PaymentFailed ParameterError(APIError), /// A parameter in a single path which was passed to send_payment was invalid, preventing us /// from attempting to send the payment at all. /// /// You can freely resend the payment in full (with the parameter error fixed). /// + /// Because the payment failed outright, no payment tracking is done and no + /// [`Event::PaymentPathFailed`] or [`Event::PaymentFailed`] events will be generated. + /// /// The results here are ordered the same as the paths in the route object which was passed to /// send_payment. /// - /// Because the payment failed outright, no payment tracking is done, you do not need to call - /// [`ChannelManager::abandon_payment`] and [`ChannelManager::retry_payment`] will *not* work - /// for this payment. - /// - /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment - /// [`ChannelManager::retry_payment`]: crate::ln::channelmanager::ChannelManager::retry_payment + /// [`Event::PaymentPathFailed`]: crate::util::events::Event::PaymentPathFailed + /// [`Event::PaymentFailed`]: crate::util::events::Event::PaymentFailed PathParameterError(Vec>), /// All paths which were attempted failed to send, with no channel state change taking place. /// You can freely resend the payment in full (though you probably want to do so over different /// paths than the ones selected). /// - /// Because the payment failed outright, no payment tracking is done, you do not need to call - /// [`ChannelManager::abandon_payment`] and [`ChannelManager::retry_payment`] will *not* work - /// for this payment. + /// Because the payment failed outright, no payment tracking is done and no + /// [`Event::PaymentPathFailed`] or [`Event::PaymentFailed`] events will be generated. /// - /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment - /// [`ChannelManager::retry_payment`]: crate::ln::channelmanager::ChannelManager::retry_payment + /// [`Event::PaymentPathFailed`]: crate::util::events::Event::PaymentPathFailed + /// [`Event::PaymentFailed`]: crate::util::events::Event::PaymentFailed AllFailedResendSafe(Vec), /// Indicates that a payment for the provided [`PaymentId`] is already in-flight and has not - /// yet completed (i.e. generated an [`Event::PaymentSent`]) or been abandoned (via - /// [`ChannelManager::abandon_payment`]). + /// yet completed (i.e. generated an [`Event::PaymentSent`] or [`Event::PaymentFailed`]). /// /// [`PaymentId`]: crate::ln::channelmanager::PaymentId /// [`Event::PaymentSent`]: crate::util::events::Event::PaymentSent - /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment + /// [`Event::PaymentFailed`]: crate::util::events::Event::PaymentFailed DuplicatePayment, - /// Some paths which were attempted failed to send, though possibly not all. At least some - /// paths have irrevocably committed to the HTLC and retrying the payment in full would result - /// in over-/re-payment. + /// Some paths that were attempted failed to send, though some paths may have succeeded. At least + /// some paths have irrevocably committed to the HTLC. /// - /// The results here are ordered the same as the paths in the route object which was passed to - /// send_payment, and any `Err`s which are not [`APIError::MonitorUpdateInProgress`] can be - /// safely retried via [`ChannelManager::retry_payment`]. + /// The results here are ordered the same as the paths in the route object that was passed to + /// send_payment. /// - /// Any entries which contain `Err(APIError::MonitorUpdateInprogress)` or `Ok(())` MUST NOT be - /// retried as they will result in over-/re-payment. These HTLCs all either successfully sent - /// (in the case of `Ok(())`) or will send once a [`MonitorEvent::Completed`] is provided for - /// the next-hop channel with the latest update_id. + /// Any entries that contain `Err(APIError::MonitorUpdateInprogress)` will send once a + /// [`MonitorEvent::Completed`] is provided for the next-hop channel with the latest update_id. /// - /// [`ChannelManager::retry_payment`]: crate::ln::channelmanager::ChannelManager::retry_payment /// [`MonitorEvent::Completed`]: crate::chain::channelmonitor::MonitorEvent::Completed PartialFailure { - /// The errors themselves, in the same order as the route hops. + /// The errors themselves, in the same order as the paths from the route. results: Vec>, /// If some paths failed without irrevocably committing to the new HTLC(s), this will - /// contain a [`RouteParameters`] object which can be used to calculate a new route that - /// will pay all remaining unpaid balance. + /// contain a [`RouteParameters`] object for the failing paths. failed_paths_retry: Option, /// The payment id for the payment, which is now at least partially pending. payment_id: PaymentId, @@ -393,33 +403,36 @@ pub enum PaymentSendFailure { pub(super) struct OutboundPayments { pub(super) pending_outbound_payments: Mutex>, + pub(super) retry_lock: Mutex<()>, } impl OutboundPayments { pub(super) fn new() -> Self { Self { - pending_outbound_payments: Mutex::new(HashMap::new()) + pending_outbound_payments: Mutex::new(HashMap::new()), + retry_lock: Mutex::new(()), } } - pub(super) fn send_payment( + pub(super) fn send_payment( &self, payment_hash: PaymentHash, payment_secret: &Option, payment_id: PaymentId, retry_strategy: Retry, route_params: RouteParameters, router: &R, - first_hops: Vec, inflight_htlcs: InFlightHtlcs, entropy_source: &ES, - node_signer: &NS, best_block_height: u32, logger: &L, send_payment_along_path: F, - ) -> Result<(), PaymentSendFailure> + first_hops: Vec, compute_inflight_htlcs: IH, entropy_source: &ES, + node_signer: &NS, best_block_height: u32, logger: &L, + pending_events: &Mutex>, send_payment_along_path: SP, + ) -> Result<(), RetryableSendFailure> where R::Target: Router, ES::Target: EntropySource, NS::Target: NodeSigner, L::Target: Logger, - F: Fn(&Vec, &Option, &PaymentHash, &Option, u64, + IH: Fn() -> InFlightHtlcs, + SP: Fn(&Vec, &Option, &PaymentHash, &Option, u64, u32, PaymentId, &Option, [u8; 32]) -> Result<(), APIError>, { - self.pay_internal(payment_id, Some((payment_hash, payment_secret, None, retry_strategy)), - route_params, router, first_hops, inflight_htlcs, entropy_source, node_signer, - best_block_height, logger, &send_payment_along_path) - .map_err(|e| { self.remove_outbound_if_all_failed(payment_id, &e); e }) + self.send_payment_internal(payment_id, payment_hash, payment_secret, None, retry_strategy, + route_params, router, first_hops, &compute_inflight_htlcs, entropy_source, node_signer, + best_block_height, logger, pending_events, &send_payment_along_path) } pub(super) fn send_payment_with_route( @@ -439,28 +452,29 @@ impl OutboundPayments { .map_err(|e| { self.remove_outbound_if_all_failed(payment_id, &e); e }) } - pub(super) fn send_spontaneous_payment( + pub(super) fn send_spontaneous_payment( &self, payment_preimage: Option, payment_id: PaymentId, retry_strategy: Retry, route_params: RouteParameters, router: &R, - first_hops: Vec, inflight_htlcs: InFlightHtlcs, entropy_source: &ES, - node_signer: &NS, best_block_height: u32, logger: &L, send_payment_along_path: F - ) -> Result + first_hops: Vec, inflight_htlcs: IH, entropy_source: &ES, + node_signer: &NS, best_block_height: u32, logger: &L, + pending_events: &Mutex>, send_payment_along_path: SP + ) -> Result where R::Target: Router, ES::Target: EntropySource, NS::Target: NodeSigner, L::Target: Logger, - F: Fn(&Vec, &Option, &PaymentHash, &Option, u64, + IH: Fn() -> InFlightHtlcs, + SP: Fn(&Vec, &Option, &PaymentHash, &Option, u64, u32, PaymentId, &Option, [u8; 32]) -> Result<(), APIError>, { let preimage = payment_preimage .unwrap_or_else(|| PaymentPreimage(entropy_source.get_secure_random_bytes())); let payment_hash = PaymentHash(Sha256::hash(&preimage.0).into_inner()); - self.pay_internal(payment_id, Some((payment_hash, &None, Some(preimage), retry_strategy)), + self.send_payment_internal(payment_id, payment_hash, &None, Some(preimage), retry_strategy, route_params, router, first_hops, inflight_htlcs, entropy_source, node_signer, - best_block_height, logger, &send_payment_along_path) + best_block_height, logger, pending_events, send_payment_along_path) .map(|()| payment_hash) - .map_err(|e| { self.remove_outbound_if_all_failed(payment_id, &e); e }) } pub(super) fn send_spontaneous_payment_with_route( @@ -489,7 +503,8 @@ impl OutboundPayments { pub(super) fn check_retry_payments( &self, router: &R, first_hops: FH, inflight_htlcs: IH, entropy_source: &ES, node_signer: &NS, - best_block_height: u32, logger: &L, send_payment_along_path: SP, + best_block_height: u32, pending_events: &Mutex>, logger: &L, + send_payment_along_path: SP, ) where R::Target: Router, @@ -501,6 +516,7 @@ impl OutboundPayments { FH: Fn() -> Vec, L::Target: Logger, { + let _single_thread = self.retry_lock.lock().unwrap(); loop { let mut outbounds = self.pending_outbound_payments.lock().unwrap(); let mut retry_id_route_params = None; @@ -523,152 +539,270 @@ impl OutboundPayments { } } } + core::mem::drop(outbounds); if let Some((payment_id, route_params)) = retry_id_route_params { - core::mem::drop(outbounds); - if let Err(e) = self.pay_internal(payment_id, None, route_params, router, first_hops(), inflight_htlcs(), entropy_source, node_signer, best_block_height, logger, &send_payment_along_path) { - log_info!(logger, "Errored retrying payment: {:?}", e); - } + self.retry_payment_internal(payment_id, route_params, router, first_hops(), &inflight_htlcs, entropy_source, node_signer, best_block_height, logger, pending_events, &send_payment_along_path) } else { break } } + + let mut outbounds = self.pending_outbound_payments.lock().unwrap(); + outbounds.retain(|pmt_id, pmt| { + let mut retain = true; + if !pmt.is_auto_retryable_now() && pmt.remaining_parts() == 0 { + if pmt.mark_abandoned().is_ok() { + pending_events.lock().unwrap().push(events::Event::PaymentFailed { + payment_id: *pmt_id, + payment_hash: pmt.payment_hash().expect("PendingOutboundPayments::Retryable always has a payment hash set"), + }); + retain = false; + } + } + retain + }); } - fn pay_internal( - &self, payment_id: PaymentId, - initial_send_info: Option<(PaymentHash, &Option, Option, Retry)>, - route_params: RouteParameters, router: &R, first_hops: Vec, - inflight_htlcs: InFlightHtlcs, entropy_source: &ES, node_signer: &NS, best_block_height: u32, - logger: &L, send_payment_along_path: &F, - ) -> Result<(), PaymentSendFailure> + pub(super) fn needs_abandon(&self) -> bool { + let outbounds = self.pending_outbound_payments.lock().unwrap(); + outbounds.iter().any(|(_, pmt)| + !pmt.is_auto_retryable_now() && pmt.remaining_parts() == 0 && !pmt.is_fulfilled()) + } + + /// Errors immediately on [`RetryableSendFailure`] error conditions. Otherwise, further errors may + /// be surfaced asynchronously via [`Event::PaymentPathFailed`] and [`Event::PaymentFailed`]. + /// + /// [`Event::PaymentPathFailed`]: crate::util::events::Event::PaymentPathFailed + /// [`Event::PaymentFailed`]: crate::util::events::Event::PaymentFailed + fn send_payment_internal( + &self, payment_id: PaymentId, payment_hash: PaymentHash, payment_secret: &Option, + keysend_preimage: Option, retry_strategy: Retry, route_params: RouteParameters, + router: &R, first_hops: Vec, inflight_htlcs: IH, entropy_source: &ES, + node_signer: &NS, best_block_height: u32, logger: &L, + pending_events: &Mutex>, send_payment_along_path: SP, + ) -> Result<(), RetryableSendFailure> where R::Target: Router, ES::Target: EntropySource, NS::Target: NodeSigner, L::Target: Logger, - F: Fn(&Vec, &Option, &PaymentHash, &Option, u64, - u32, PaymentId, &Option, [u8; 32]) -> Result<(), APIError> + IH: Fn() -> InFlightHtlcs, + SP: Fn(&Vec, &Option, &PaymentHash, &Option, u64, + u32, PaymentId, &Option, [u8; 32]) -> Result<(), APIError> { #[cfg(feature = "std")] { if has_expired(&route_params) { - return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError { - err: format!("Invoice expired for payment id {}", log_bytes!(payment_id.0)), - })) + return Err(RetryableSendFailure::PaymentExpired) } } let route = router.find_route( &node_signer.get_node_id(Recipient::Node).unwrap(), &route_params, - Some(&first_hops.iter().collect::>()), &inflight_htlcs - ).map_err(|e| PaymentSendFailure::ParameterError(APIError::APIMisuseError { - err: format!("Failed to find a route for payment {}: {:?}", log_bytes!(payment_id.0), e), // TODO: add APIError::RouteNotFound - }))?; - - let res = if let Some((payment_hash, payment_secret, keysend_preimage, retry_strategy)) = initial_send_info { - let onion_session_privs = self.add_new_pending_payment(payment_hash, *payment_secret, payment_id, keysend_preimage, &route, Some(retry_strategy), Some(route_params.payment_params.clone()), entropy_source, best_block_height)?; - self.pay_route_internal(&route, payment_hash, payment_secret, None, payment_id, None, onion_session_privs, node_signer, best_block_height, send_payment_along_path) - } else { - self.retry_payment_with_route(&route, payment_id, entropy_source, node_signer, best_block_height, send_payment_along_path) - }; - match res { - Err(PaymentSendFailure::AllFailedResendSafe(_)) => { - let retry_res = self.pay_internal(payment_id, None, route_params, router, first_hops, inflight_htlcs, entropy_source, node_signer, best_block_height, logger, send_payment_along_path); - log_info!(logger, "Result retrying payment id {}: {:?}", log_bytes!(payment_id.0), retry_res); - if let Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError { err })) = &retry_res { - if err.starts_with("Retries exhausted ") { return res; } - } - retry_res - }, - Err(PaymentSendFailure::PartialFailure { failed_paths_retry: Some(retry), .. }) => { - // Some paths were sent, even if we failed to send the full MPP value our recipient may - // misbehave and claim the funds, at which point we have to consider the payment sent, so - // return `Ok()` here, ignoring any retry errors. - let retry_res = self.pay_internal(payment_id, None, retry, router, first_hops, inflight_htlcs, entropy_source, node_signer, best_block_height, logger, send_payment_along_path); - log_info!(logger, "Result retrying payment id {}: {:?}", log_bytes!(payment_id.0), retry_res); - Ok(()) - }, - Err(PaymentSendFailure::PartialFailure { failed_paths_retry: None, .. }) => { - // This may happen if we send a payment and some paths fail, but only due to a temporary - // monitor failure or the like, implying they're really in-flight, but we haven't sent the - // initial HTLC-Add messages yet. - Ok(()) - }, - res => res, + Some(&first_hops.iter().collect::>()), &inflight_htlcs() + ).map_err(|_| RetryableSendFailure::RouteNotFound)?; + + let onion_session_privs = self.add_new_pending_payment(payment_hash, *payment_secret, + payment_id, keysend_preimage, &route, Some(retry_strategy), + Some(route_params.payment_params.clone()), entropy_source, best_block_height) + .map_err(|_| RetryableSendFailure::DuplicatePayment)?; + + let res = self.pay_route_internal(&route, payment_hash, payment_secret, None, payment_id, None, + onion_session_privs, node_signer, best_block_height, &send_payment_along_path); + log_info!(logger, "Result sending payment with id {}: {:?}", log_bytes!(payment_id.0), res); + if let Err(e) = res { + 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); } + Ok(()) } - pub(super) fn retry_payment_with_route( - &self, route: &Route, payment_id: PaymentId, entropy_source: &ES, node_signer: &NS, best_block_height: u32, - send_payment_along_path: F - ) -> Result<(), PaymentSendFailure> + fn retry_payment_internal( + &self, payment_id: PaymentId, route_params: RouteParameters, router: &R, + first_hops: Vec, inflight_htlcs: &IH, entropy_source: &ES, node_signer: &NS, + best_block_height: u32, logger: &L, pending_events: &Mutex>, + send_payment_along_path: &SP, + ) where + R::Target: Router, ES::Target: EntropySource, NS::Target: NodeSigner, - F: Fn(&Vec, &Option, &PaymentHash, &Option, u64, - u32, PaymentId, &Option, [u8; 32]) -> Result<(), APIError> + L::Target: Logger, + IH: Fn() -> InFlightHtlcs, + SP: Fn(&Vec, &Option, &PaymentHash, &Option, u64, + u32, PaymentId, &Option, [u8; 32]) -> Result<(), APIError> { - const RETRY_OVERFLOW_PERCENTAGE: u64 = 10; + #[cfg(feature = "std")] { + if has_expired(&route_params) { + log_error!(logger, "Payment params expired on retry, abandoning payment {}", log_bytes!(payment_id.0)); + self.abandon_payment(payment_id, pending_events); + return + } + } + + let route = match router.find_route( + &node_signer.get_node_id(Recipient::Node).unwrap(), &route_params, + Some(&first_hops.iter().collect::>()), &inflight_htlcs() + ) { + Ok(route) => route, + Err(e) => { + log_error!(logger, "Failed to find a route on retry, abandoning payment {}: {:#?}", log_bytes!(payment_id.0), e); + self.abandon_payment(payment_id, pending_events); + return + } + }; for path in route.paths.iter() { if path.len() == 0 { - return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError { - err: "length-0 path in route".to_string() - })) + log_error!(logger, "length-0 path in route"); + self.abandon_payment(payment_id, pending_events); + return } } + const RETRY_OVERFLOW_PERCENTAGE: u64 = 10; let mut onion_session_privs = Vec::with_capacity(route.paths.len()); for _ in 0..route.paths.len() { onion_session_privs.push(entropy_source.get_secure_random_bytes()); } + macro_rules! abandon_with_entry { + ($payment_id: expr, $payment_hash: expr, $payment: expr, $pending_events: expr) => { + if $payment.get_mut().mark_abandoned().is_ok() && $payment.get().remaining_parts() == 0 { + $pending_events.lock().unwrap().push(events::Event::PaymentFailed { + payment_id: $payment_id, + payment_hash: $payment_hash, + }); + $payment.remove(); + } + } + } let (total_msat, payment_hash, payment_secret, keysend_preimage) = { let mut outbounds = self.pending_outbound_payments.lock().unwrap(); - match outbounds.get_mut(&payment_id) { - Some(payment) => { - let res = match payment { + match outbounds.entry(payment_id) { + hash_map::Entry::Occupied(mut payment) => { + let res = match payment.get() { PendingOutboundPayment::Retryable { total_msat, payment_hash, keysend_preimage, payment_secret, pending_amt_msat, .. } => { let retry_amt_msat: u64 = route.paths.iter().map(|path| path.last().unwrap().fee_msat).sum(); if retry_amt_msat + *pending_amt_msat > *total_msat * (100 + RETRY_OVERFLOW_PERCENTAGE) / 100 { - return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError { - err: format!("retry_amt_msat of {} will put pending_amt_msat (currently: {}) more than 10% over total_payment_amt_msat of {}", retry_amt_msat, pending_amt_msat, total_msat).to_string() - })) + 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); + let payment_hash = *payment_hash; + abandon_with_entry!(payment_id, payment_hash, payment, pending_events); + return } (*total_msat, *payment_hash, *payment_secret, *keysend_preimage) }, PendingOutboundPayment::Legacy { .. } => { - return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError { - err: "Unable to retry payments that were initially sent on LDK versions prior to 0.0.102".to_string() - })) + log_error!(logger, "Unable to retry payments that were initially sent on LDK versions prior to 0.0.102"); + return }, PendingOutboundPayment::Fulfilled { .. } => { - return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError { - err: "Payment already completed".to_owned() - })); + log_error!(logger, "Payment already completed"); + return }, PendingOutboundPayment::Abandoned { .. } => { - return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError { - err: "Payment already abandoned (with some HTLCs still pending)".to_owned() - })); + log_error!(logger, "Payment already abandoned (with some HTLCs still pending)"); + return }, }; - if !payment.is_retryable_now() { - return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError { - err: format!("Retries exhausted for payment id {}", log_bytes!(payment_id.0)), - })) + if !payment.get().is_retryable_now() { + log_error!(logger, "Retries exhausted for payment id {}", log_bytes!(payment_id.0)); + abandon_with_entry!(payment_id, res.1, payment, pending_events); + return } - payment.increment_attempts(); + payment.get_mut().increment_attempts(); for (path, session_priv_bytes) in route.paths.iter().zip(onion_session_privs.iter()) { - assert!(payment.insert(*session_priv_bytes, path)); + assert!(payment.get_mut().insert(*session_priv_bytes, path)); } res }, - None => - return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError { - err: format!("Payment with ID {} not found", log_bytes!(payment_id.0)), - })), + hash_map::Entry::Vacant(_) => { + log_error!(logger, "Payment with ID {} not found", log_bytes!(payment_id.0)); + return + } } }; - self.pay_route_internal(route, payment_hash, &payment_secret, keysend_preimage, payment_id, Some(total_msat), onion_session_privs, node_signer, best_block_height, &send_payment_along_path) + let res = self.pay_route_internal(&route, payment_hash, &payment_secret, keysend_preimage, + payment_id, Some(total_msat), onion_session_privs, node_signer, best_block_height, + &send_payment_along_path); + log_info!(logger, "Result retrying payment id {}: {:?}", log_bytes!(payment_id.0), res); + if let Err(e) = res { + 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); + } + } + + fn handle_pay_route_err( + &self, err: PaymentSendFailure, payment_id: PaymentId, payment_hash: PaymentHash, route: Route, + mut route_params: RouteParameters, router: &R, first_hops: Vec, + inflight_htlcs: &IH, entropy_source: &ES, node_signer: &NS, best_block_height: u32, logger: &L, + pending_events: &Mutex>, send_payment_along_path: &SP, + ) + where + R::Target: Router, + ES::Target: EntropySource, + NS::Target: NodeSigner, + L::Target: Logger, + IH: Fn() -> InFlightHtlcs, + SP: Fn(&Vec, &Option, &PaymentHash, &Option, u64, + u32, PaymentId, &Option, [u8; 32]) -> Result<(), APIError> + { + match err { + PaymentSendFailure::AllFailedResendSafe(errs) => { + 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); + self.retry_payment_internal(payment_id, route_params, router, first_hops, inflight_htlcs, entropy_source, node_signer, best_block_height, logger, pending_events, send_payment_along_path); + }, + PaymentSendFailure::PartialFailure { failed_paths_retry: Some(mut retry), results, .. } => { + Self::push_path_failed_evs_and_scids(payment_id, payment_hash, &mut retry, route.paths, results.into_iter(), pending_events); + // Some paths were sent, even if we failed to send the full MPP value our recipient may + // misbehave and claim the funds, at which point we have to consider the payment sent, so + // return `Ok()` here, ignoring any retry errors. + self.retry_payment_internal(payment_id, retry, router, first_hops, inflight_htlcs, entropy_source, node_signer, best_block_height, logger, pending_events, send_payment_along_path); + }, + PaymentSendFailure::PartialFailure { failed_paths_retry: None, .. } => { + // This may happen if we send a payment and some paths fail, but only due to a temporary + // monitor failure or the like, implying they're really in-flight, but we haven't sent the + // initial HTLC-Add messages yet. + }, + PaymentSendFailure::PathParameterError(results) => { + Self::push_path_failed_evs_and_scids(payment_id, payment_hash, &mut route_params, route.paths, results.into_iter(), pending_events); + self.abandon_payment(payment_id, pending_events); + }, + PaymentSendFailure::ParameterError(e) => { + log_error!(logger, "Failed to send to route due to parameter error: {:?}. Your router is buggy", e); + self.abandon_payment(payment_id, pending_events); + }, + PaymentSendFailure::DuplicatePayment => debug_assert!(false), // unreachable + } + } + + fn push_path_failed_evs_and_scids>>( + payment_id: PaymentId, payment_hash: PaymentHash, route_params: &mut RouteParameters, + paths: Vec>, path_results: I, pending_events: &Mutex> + ) { + let mut events = pending_events.lock().unwrap(); + debug_assert_eq!(paths.len(), path_results.len()); + for (path, path_res) in paths.into_iter().zip(path_results) { + if let Err(e) = path_res { + let failed_scid = if let APIError::InvalidRoute { .. } = e { + None + } else { + let scid = path[0].short_channel_id; + route_params.payment_params.previously_failed_channels.push(scid); + Some(scid) + }; + events.push(events::Event::PaymentPathFailed { + payment_id: Some(payment_id), + payment_hash, + payment_failed_permanently: false, + network_update: None, + all_paths_failed: false, + path, + short_channel_id: failed_scid, + retry: None, + #[cfg(test)] + error_code: None, + #[cfg(test)] + error_data: None, + }); + } + } } pub(super) fn send_probe( @@ -873,8 +1007,8 @@ impl OutboundPayments { .map_err(|e| { self.remove_outbound_if_all_failed(payment_id, &e); e }) } - // If we failed to send any paths, we should remove the new PaymentId from the - // `pending_outbound_payments` map, as the user isn't expected to `abandon_payment`. + // If we failed to send any paths, remove the new PaymentId from the `pending_outbound_payments` + // map as the payment is free to be resent. fn remove_outbound_if_all_failed(&self, payment_id: PaymentId, err: &PaymentSendFailure) { if let &PaymentSendFailure::AllFailedResendSafe(_) = err { let removed = self.pending_outbound_payments.lock().unwrap().remove(&payment_id).is_some(); @@ -990,34 +1124,51 @@ impl OutboundPayments { }); } + // Returns a bool indicating whether a PendingHTLCsForwardable event should be generated. pub(super) fn fail_htlc( &self, source: &HTLCSource, payment_hash: &PaymentHash, onion_error: &HTLCFailReason, path: &Vec, session_priv: &SecretKey, payment_id: &PaymentId, payment_params: &Option, probing_cookie_secret: [u8; 32], secp_ctx: &Secp256k1, pending_events: &Mutex>, logger: &L - ) where L::Target: Logger { + ) -> bool where L::Target: Logger { #[cfg(test)] let (network_update, short_channel_id, payment_retryable, onion_error_code, onion_error_data) = onion_error.decode_onion_failure(secp_ctx, logger, &source); #[cfg(not(test))] let (network_update, short_channel_id, payment_retryable, _, _) = onion_error.decode_onion_failure(secp_ctx, logger, &source); + let payment_is_probe = payment_is_probe(payment_hash, &payment_id, probing_cookie_secret); let mut session_priv_bytes = [0; 32]; session_priv_bytes.copy_from_slice(&session_priv[..]); let mut outbounds = self.pending_outbound_payments.lock().unwrap(); + + // If any payments already need retry, there's no need to generate a redundant + // `PendingHTLCsForwardable`. + let already_awaiting_retry = outbounds.iter().any(|(_, pmt)| { + let mut awaiting_retry = false; + if pmt.is_auto_retryable_now() { + if let PendingOutboundPayment::Retryable { pending_amt_msat, total_msat, .. } = pmt { + if pending_amt_msat < total_msat { + awaiting_retry = true; + } + } + } + awaiting_retry + }); + let mut all_paths_failed = false; let mut full_failure_ev = None; - let mut pending_retry_ev = None; + let mut pending_retry_ev = false; let mut retry = None; let attempts_remaining = if let hash_map::Entry::Occupied(mut payment) = outbounds.entry(*payment_id) { if !payment.get_mut().remove(&session_priv_bytes, Some(&path)) { log_trace!(logger, "Received duplicative fail for HTLC with payment_hash {}", log_bytes!(payment_hash.0)); - return + return false } if payment.get().is_fulfilled() { log_trace!(logger, "Received failure of HTLC with payment_hash {} after payment completion", log_bytes!(payment_hash.0)); - return + return false } - let is_retryable_now = payment.get().is_auto_retryable_now(); + let mut is_retryable_now = payment.get().is_auto_retryable_now(); if let Some(scid) = short_channel_id { payment.get_mut().insert_previously_failed_scid(scid); } @@ -1048,26 +1199,32 @@ impl OutboundPayments { }); } + if payment_is_probe || !is_retryable_now || !payment_retryable || retry.is_none() { + let _ = payment.get_mut().mark_abandoned(); // we'll only Err if it's a legacy payment + is_retryable_now = false; + } if payment.get().remaining_parts() == 0 { all_paths_failed = true; if payment.get().abandoned() { - full_failure_ev = Some(events::Event::PaymentFailed { - payment_id: *payment_id, - payment_hash: payment.get().payment_hash().expect("PendingOutboundPayments::RetriesExceeded always has a payment hash set"), - }); + if !payment_is_probe { + full_failure_ev = Some(events::Event::PaymentFailed { + payment_id: *payment_id, + payment_hash: payment.get().payment_hash().expect("PendingOutboundPayments::RetriesExceeded always has a payment hash set"), + }); + } payment.remove(); } } is_retryable_now } else { log_trace!(logger, "Received duplicative fail for HTLC with payment_hash {}", log_bytes!(payment_hash.0)); - return + return false }; core::mem::drop(outbounds); log_trace!(logger, "Failing outbound payment HTLC with payment_hash {}", log_bytes!(payment_hash.0)); let path_failure = { - if payment_is_probe(payment_hash, &payment_id, probing_cookie_secret) { + if payment_is_probe { if !payment_retryable { events::Event::ProbeSuccessful { payment_id: *payment_id, @@ -1089,11 +1246,11 @@ impl OutboundPayments { if let Some(scid) = short_channel_id { retry.as_mut().map(|r| r.payment_params.previously_failed_channels.push(scid)); } - if payment_retryable && attempts_remaining && retry.is_some() { + // If we miss abandoning the payment above, we *must* generate an event here or else the + // payment will sit in our outbounds forever. + if attempts_remaining && !already_awaiting_retry { debug_assert!(full_failure_ev.is_none()); - pending_retry_ev = Some(events::Event::PendingHTLCsForwardable { - time_forwardable: Duration::from_millis(MIN_HTLC_RELAY_HOLDING_CELL_MILLIS), - }); + pending_retry_ev = true; } events::Event::PaymentPathFailed { payment_id: Some(*payment_id), @@ -1114,16 +1271,17 @@ impl OutboundPayments { let mut pending_events = pending_events.lock().unwrap(); pending_events.push(path_failure); if let Some(ev) = full_failure_ev { pending_events.push(ev); } - if let Some(ev) = pending_retry_ev { pending_events.push(ev); } + pending_retry_ev } - pub(super) fn abandon_payment(&self, payment_id: PaymentId) -> Option { - let mut failed_ev = None; + pub(super) fn abandon_payment( + &self, payment_id: PaymentId, pending_events: &Mutex> + ) { let mut outbounds = self.pending_outbound_payments.lock().unwrap(); if let hash_map::Entry::Occupied(mut payment) = outbounds.entry(payment_id) { if let Ok(()) = payment.get_mut().mark_abandoned() { if payment.get().remaining_parts() == 0 { - failed_ev = Some(events::Event::PaymentFailed { + pending_events.lock().unwrap().push(events::Event::PaymentFailed { payment_id, payment_hash: payment.get().payment_hash().expect("PendingOutboundPayments::RetriesExceeded always has a payment hash set"), }); @@ -1131,7 +1289,6 @@ impl OutboundPayments { } } } - failed_ev } #[cfg(test)] @@ -1197,13 +1354,13 @@ mod tests { use bitcoin::secp256k1::{PublicKey, Secp256k1, SecretKey}; use crate::ln::PaymentHash; - use crate::ln::channelmanager::{PaymentId, PaymentSendFailure}; + use crate::ln::channelmanager::PaymentId; use crate::ln::msgs::{ErrorAction, LightningError}; - use crate::ln::outbound_payment::{OutboundPayments, Retry}; + use crate::ln::outbound_payment::{OutboundPayments, Retry, RetryableSendFailure}; use crate::routing::gossip::NetworkGraph; use crate::routing::router::{InFlightHtlcs, PaymentParameters, Route, RouteParameters}; use crate::sync::{Arc, Mutex}; - use crate::util::errors::APIError; + use crate::util::events::Event; use crate::util::test_utils; #[test] @@ -1233,19 +1390,25 @@ mod tests { final_value_msat: 0, final_cltv_expiry_delta: 0, }; - let err = if on_retry { - outbound_payments.pay_internal( - PaymentId([0; 32]), None, expired_route_params, &&router, vec![], InFlightHtlcs::new(), - &&keys_manager, &&keys_manager, 0, &&logger, &|_, _, _, _, _, _, _, _, _| Ok(())).unwrap_err() + let pending_events = Mutex::new(Vec::new()); + if on_retry { + outbound_payments.add_new_pending_payment(PaymentHash([0; 32]), None, PaymentId([0; 32]), None, + &Route { paths: vec![], payment_params: None }, Some(Retry::Attempts(1)), + Some(expired_route_params.payment_params.clone()), &&keys_manager, 0).unwrap(); + outbound_payments.retry_payment_internal( + PaymentId([0; 32]), expired_route_params, &&router, vec![], &|| InFlightHtlcs::new(), + &&keys_manager, &&keys_manager, 0, &&logger, &pending_events, + &|_, _, _, _, _, _, _, _, _| Ok(())); + let events = pending_events.lock().unwrap(); + assert_eq!(events.len(), 1); + if let Event::PaymentFailed { .. } = events[0] { } else { panic!("Unexpected event"); } } else { - outbound_payments.send_payment( + let err = outbound_payments.send_payment( PaymentHash([0; 32]), &None, PaymentId([0; 32]), Retry::Attempts(0), expired_route_params, - &&router, vec![], InFlightHtlcs::new(), &&keys_manager, &&keys_manager, 0, &&logger, - |_, _, _, _, _, _, _, _, _| Ok(())).unwrap_err() - }; - if let PaymentSendFailure::ParameterError(APIError::APIMisuseError { err }) = err { - assert!(err.contains("Invoice expired")); - } else { panic!("Unexpected error"); } + &&router, vec![], || InFlightHtlcs::new(), &&keys_manager, &&keys_manager, 0, &&logger, + &pending_events, |_, _, _, _, _, _, _, _, _| Ok(())).unwrap_err(); + if let RetryableSendFailure::PaymentExpired = err { } else { panic!("Unexpected error"); } + } } #[test] @@ -1273,21 +1436,25 @@ mod tests { router.expect_find_route(route_params.clone(), Err(LightningError { err: String::new(), action: ErrorAction::IgnoreError })); - let err = if on_retry { + let pending_events = Mutex::new(Vec::new()); + if on_retry { outbound_payments.add_new_pending_payment(PaymentHash([0; 32]), None, PaymentId([0; 32]), None, &Route { paths: vec![], payment_params: None }, Some(Retry::Attempts(1)), Some(route_params.payment_params.clone()), &&keys_manager, 0).unwrap(); - outbound_payments.pay_internal( - PaymentId([0; 32]), None, route_params, &&router, vec![], InFlightHtlcs::new(), - &&keys_manager, &&keys_manager, 0, &&logger, &|_, _, _, _, _, _, _, _, _| Ok(())).unwrap_err() + outbound_payments.retry_payment_internal( + PaymentId([0; 32]), route_params, &&router, vec![], &|| InFlightHtlcs::new(), + &&keys_manager, &&keys_manager, 0, &&logger, &pending_events, + &|_, _, _, _, _, _, _, _, _| Ok(())); + let events = pending_events.lock().unwrap(); + assert_eq!(events.len(), 1); + if let Event::PaymentFailed { .. } = events[0] { } else { panic!("Unexpected event"); } } else { - outbound_payments.send_payment( + let err = outbound_payments.send_payment( PaymentHash([0; 32]), &None, PaymentId([0; 32]), Retry::Attempts(0), route_params, - &&router, vec![], InFlightHtlcs::new(), &&keys_manager, &&keys_manager, 0, &&logger, - |_, _, _, _, _, _, _, _, _| Ok(())).unwrap_err() - }; - if let PaymentSendFailure::ParameterError(APIError::APIMisuseError { err }) = err { - assert!(err.contains("Failed to find a route")); - } else { panic!("Unexpected error"); } + &&router, vec![], || InFlightHtlcs::new(), &&keys_manager, &&keys_manager, 0, &&logger, + &pending_events, |_, _, _, _, _, _, _, _, _| Ok(())).unwrap_err(); + if let RetryableSendFailure::RouteNotFound = err { + } else { panic!("Unexpected error"); } + } } }