use crate::ln::features::{ChannelFeatures, ChannelTypeFeatures, InitFeatures, NodeFeatures};
#[cfg(any(feature = "_test_utils", test))]
use crate::ln::features::InvoiceFeatures;
-use crate::routing::router::{InFlightHtlcs, PaymentParameters, Route, RouteHop, RoutePath, RouteParameters};
+use crate::routing::router::{InFlightHtlcs, PaymentParameters, Route, RouteHop, RoutePath};
use crate::ln::msgs;
use crate::ln::onion_utils;
use crate::ln::onion_utils::HTLCFailReason;
use crate::ln::msgs::{ChannelMessageHandler, DecodeError, LightningError, MAX_VALUE_MSAT};
+#[cfg(test)]
+use crate::ln::outbound_payment;
+use crate::ln::outbound_payment::{OutboundPayments, PendingOutboundPayment};
use crate::ln::wire::Encode;
use crate::chain::keysinterface::{Sign, KeysInterface, KeysManager, Recipient};
use crate::util::config::{UserConfig, ChannelConfig};
use core::time::Duration;
use core::ops::Deref;
+// Re-export this for use in the public API.
+pub use crate::ln::outbound_payment::PaymentSendFailure;
+
// We hold various information about HTLC relay in the HTLC objects in Channel itself:
//
// Upon receipt of an HTLC from a peer, we'll give it a PendingHTLCStatus indicating if it should
min_value_msat: Option<u64>,
}
-/// Stores the session_priv for each part of a payment that is still pending. For versions 0.0.102
-/// and later, also stores information for retrying the payment.
-pub(crate) enum PendingOutboundPayment {
- Legacy {
- session_privs: HashSet<[u8; 32]>,
- },
- Retryable {
- session_privs: HashSet<[u8; 32]>,
- payment_hash: PaymentHash,
- payment_secret: Option<PaymentSecret>,
- pending_amt_msat: u64,
- /// Used to track the fee paid. Only present if the payment was serialized on 0.0.103+.
- pending_fee_msat: Option<u64>,
- /// The total payment amount across all paths, used to verify that a retry is not overpaying.
- total_msat: u64,
- /// Our best known block height at the time this payment was initiated.
- starting_block_height: u32,
- },
- /// When a pending payment is fulfilled, we continue tracking it until all pending HTLCs have
- /// been resolved. This ensures we don't look up pending payments in ChannelMonitors on restart
- /// and add a pending payment that was already fulfilled.
- Fulfilled {
- session_privs: HashSet<[u8; 32]>,
- payment_hash: Option<PaymentHash>,
- 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) https://github.com/lightningdevkit/rust-lightning/issues/1164
- Abandoned {
- session_privs: HashSet<[u8; 32]>,
- payment_hash: PaymentHash,
- },
-}
-
-impl PendingOutboundPayment {
- fn is_fulfilled(&self) -> bool {
- match self {
- PendingOutboundPayment::Fulfilled { .. } => true,
- _ => false,
- }
- }
- fn abandoned(&self) -> bool {
- match self {
- PendingOutboundPayment::Abandoned { .. } => true,
- _ => false,
- }
- }
- fn get_pending_fee_msat(&self) -> Option<u64> {
- match self {
- PendingOutboundPayment::Retryable { pending_fee_msat, .. } => pending_fee_msat.clone(),
- _ => None,
- }
- }
-
- fn payment_hash(&self) -> Option<PaymentHash> {
- match self {
- PendingOutboundPayment::Legacy { .. } => None,
- PendingOutboundPayment::Retryable { payment_hash, .. } => Some(*payment_hash),
- PendingOutboundPayment::Fulfilled { payment_hash, .. } => *payment_hash,
- PendingOutboundPayment::Abandoned { payment_hash, .. } => Some(*payment_hash),
- }
- }
-
- fn mark_fulfilled(&mut self) {
- let mut session_privs = HashSet::new();
- core::mem::swap(&mut session_privs, match self {
- PendingOutboundPayment::Legacy { session_privs } |
- PendingOutboundPayment::Retryable { session_privs, .. } |
- PendingOutboundPayment::Fulfilled { session_privs, .. } |
- PendingOutboundPayment::Abandoned { session_privs, .. }
- => session_privs,
- });
- let payment_hash = self.payment_hash();
- *self = PendingOutboundPayment::Fulfilled { session_privs, payment_hash, timer_ticks_without_htlcs: 0 };
- }
-
- fn mark_abandoned(&mut self) -> Result<(), ()> {
- let mut session_privs = HashSet::new();
- let our_payment_hash;
- core::mem::swap(&mut session_privs, match self {
- PendingOutboundPayment::Legacy { .. } |
- PendingOutboundPayment::Fulfilled { .. } =>
- return Err(()),
- 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(())
- }
-
- /// panics if path is None and !self.is_fulfilled
- fn remove(&mut self, session_priv: &[u8; 32], path: Option<&Vec<RouteHop>>) -> bool {
- let remove_res = match self {
- PendingOutboundPayment::Legacy { session_privs } |
- PendingOutboundPayment::Retryable { session_privs, .. } |
- PendingOutboundPayment::Fulfilled { session_privs, .. } |
- PendingOutboundPayment::Abandoned { session_privs, .. } => {
- session_privs.remove(session_priv)
- }
- };
- if remove_res {
- if let PendingOutboundPayment::Retryable { ref mut pending_amt_msat, ref mut pending_fee_msat, .. } = self {
- let path = path.expect("Fulfilling a payment should always come with a path");
- let path_last_hop = path.last().expect("Outbound payments must have had a valid path");
- *pending_amt_msat -= path_last_hop.fee_msat;
- if let Some(fee_msat) = pending_fee_msat.as_mut() {
- *fee_msat -= path.get_path_fees();
- }
- }
- }
- remove_res
- }
-
- fn insert(&mut self, session_priv: [u8; 32], path: &Vec<RouteHop>) -> bool {
- let insert_res = match self {
- PendingOutboundPayment::Legacy { session_privs } |
- PendingOutboundPayment::Retryable { session_privs, .. } => {
- session_privs.insert(session_priv)
- }
- PendingOutboundPayment::Fulfilled { .. } => false,
- PendingOutboundPayment::Abandoned { .. } => false,
- };
- if insert_res {
- if let PendingOutboundPayment::Retryable { ref mut pending_amt_msat, ref mut pending_fee_msat, .. } = self {
- let path_last_hop = path.last().expect("Outbound payments must have had a valid path");
- *pending_amt_msat += path_last_hop.fee_msat;
- if let Some(fee_msat) = pending_fee_msat.as_mut() {
- *fee_msat += path.get_path_fees();
- }
- }
- }
- insert_res
- }
-
- fn remaining_parts(&self) -> usize {
- match self {
- PendingOutboundPayment::Legacy { session_privs } |
- PendingOutboundPayment::Retryable { session_privs, .. } |
- PendingOutboundPayment::Fulfilled { session_privs, .. } |
- PendingOutboundPayment::Abandoned { session_privs, .. } => {
- session_privs.len()
- }
- }
- }
-}
-
/// SimpleArcChannelManager is useful when you need a ChannelManager with a static lifetime, e.g.
/// when you're using lightning-net-tokio (since tokio::spawn requires parameters with static
/// lifetimes). Other times you can afford a reference, which is more efficient, in which case
// | |
// | |__`claimable_payments`
// | |
-// | |__`pending_outbound_payments`
+// | |__`pending_outbound_payments` // This field's struct contains a map of pending outbounds
// | |
// | |__`channel_state`
// | |
/// See `PendingOutboundPayment` documentation for more info.
///
/// See `ChannelManager` struct-level documentation for lock order requirements.
- pending_outbound_payments: Mutex<HashMap<PaymentId, PendingOutboundPayment>>,
+ pending_outbound_payments: OutboundPayments,
/// SCID/SCID Alias -> forward infos. Key of 0 means payments received.
///
/// The number of ticks of [`ChannelManager::timer_tick_occurred`] until we time-out the
/// idempotency of payments by [`PaymentId`]. See
-/// [`ChannelManager::remove_stale_resolved_payments`].
+/// [`OutboundPayments::remove_stale_resolved_payments`].
pub(crate) const IDEMPOTENCY_TIMEOUT_TICKS: u8 = 7;
/// Information needed for constructing an invoice route hint for this channel.
}
}
-/// 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.
-#[derive(Clone, Debug)]
-pub enum PaymentSendFailure {
- /// A parameter 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, you do not need to call
- /// [`ChannelManager::abandon_payment`] and [`ChannelManager::retry_payment`] will *not* work
- /// for this payment.
- 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).
- ///
- /// 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.
- PathParameterError(Vec<Result<(), APIError>>),
- /// 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.
- AllFailedResendSafe(Vec<APIError>),
- /// 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`]).
- ///
- /// [`Event::PaymentSent`]: events::Event::PaymentSent
- 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.
- ///
- /// 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`].
- ///
- /// 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.
- PartialFailure {
- /// The errors themselves, in the same order as the route hops.
- results: Vec<Result<(), APIError>>,
- /// 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.
- failed_paths_retry: Option<RouteParameters>,
- /// The payment id for the payment, which is now at least partially pending.
- payment_id: PaymentId,
- },
-}
-
/// Route hints used in constructing invoices for [phantom node payents].
///
/// [phantom node payments]: crate::chain::keysinterface::PhantomKeysManager
}),
outbound_scid_aliases: Mutex::new(HashSet::new()),
pending_inbound_payments: Mutex::new(HashMap::new()),
- pending_outbound_payments: Mutex::new(HashMap::new()),
+ pending_outbound_payments: OutboundPayments::new(),
forward_htlcs: Mutex::new(HashMap::new()),
claimable_payments: Mutex::new(ClaimablePayments { claimable_htlcs: HashMap::new(), pending_claiming_payments: HashMap::new() }),
pending_intercepted_htlcs: Mutex::new(HashMap::new()),
/// [`Event::PaymentSent`]: events::Event::PaymentSent
/// [`PeerManager::process_events`]: crate::ln::peer_handler::PeerManager::process_events
pub fn send_payment(&self, route: &Route, payment_hash: PaymentHash, payment_secret: &Option<PaymentSecret>, payment_id: PaymentId) -> Result<(), PaymentSendFailure> {
- let onion_session_privs = self.add_new_pending_payment(payment_hash, *payment_secret, payment_id, route)?;
- self.send_payment_internal(route, payment_hash, payment_secret, None, payment_id, None, onion_session_privs)
+ let best_block_height = self.best_block.read().unwrap().height();
+ self.pending_outbound_payments
+ .send_payment_with_route(route, payment_hash, payment_secret, payment_id, &self.keys_manager, best_block_height,
+ |path, payment_params, payment_hash, payment_secret, total_value, cur_height, payment_id, keysend_preimage, session_priv|
+ self.send_payment_along_path(path, payment_params, payment_hash, payment_secret, total_value, cur_height, payment_id, keysend_preimage, session_priv))
}
#[cfg(test)]
- pub(crate) fn test_add_new_pending_payment(&self, payment_hash: PaymentHash, payment_secret: Option<PaymentSecret>, payment_id: PaymentId, route: &Route) -> Result<Vec<[u8; 32]>, PaymentSendFailure> {
- self.add_new_pending_payment(payment_hash, payment_secret, payment_id, route)
+ fn test_send_payment_internal(&self, route: &Route, payment_hash: PaymentHash, payment_secret: &Option<PaymentSecret>, keysend_preimage: Option<PaymentPreimage>, payment_id: PaymentId, recv_value_msat: Option<u64>, onion_session_privs: Vec<[u8; 32]>) -> Result<(), PaymentSendFailure> {
+ let best_block_height = self.best_block.read().unwrap().height();
+ self.pending_outbound_payments.test_send_payment_internal(route, payment_hash, payment_secret, keysend_preimage, payment_id, recv_value_msat, onion_session_privs, &self.keys_manager, best_block_height,
+ |path, payment_params, payment_hash, payment_secret, total_value, cur_height, payment_id, keysend_preimage, session_priv|
+ self.send_payment_along_path(path, payment_params, payment_hash, payment_secret, total_value, cur_height, payment_id, keysend_preimage, session_priv))
}
- fn add_new_pending_payment(&self, payment_hash: PaymentHash, payment_secret: Option<PaymentSecret>, payment_id: PaymentId, route: &Route) -> Result<Vec<[u8; 32]>, PaymentSendFailure> {
- let mut onion_session_privs = Vec::with_capacity(route.paths.len());
- for _ in 0..route.paths.len() {
- onion_session_privs.push(self.keys_manager.get_secure_random_bytes());
- }
-
- let mut pending_outbounds = self.pending_outbound_payments.lock().unwrap();
- match pending_outbounds.entry(payment_id) {
- hash_map::Entry::Occupied(_) => Err(PaymentSendFailure::DuplicatePayment),
- hash_map::Entry::Vacant(entry) => {
- let payment = entry.insert(PendingOutboundPayment::Retryable {
- session_privs: HashSet::new(),
- pending_amt_msat: 0,
- pending_fee_msat: Some(0),
- payment_hash,
- payment_secret,
- starting_block_height: self.best_block.read().unwrap().height(),
- total_msat: route.get_total_amount(),
- });
-
- for (path, session_priv_bytes) in route.paths.iter().zip(onion_session_privs.iter()) {
- assert!(payment.insert(*session_priv_bytes, path));
- }
-
- Ok(onion_session_privs)
- },
- }
+ #[cfg(test)]
+ pub(crate) fn test_add_new_pending_payment(&self, payment_hash: PaymentHash, payment_secret: Option<PaymentSecret>, payment_id: PaymentId, route: &Route) -> Result<Vec<[u8; 32]>, PaymentSendFailure> {
+ let best_block_height = self.best_block.read().unwrap().height();
+ self.pending_outbound_payments.add_new_pending_payment(payment_hash, payment_secret, payment_id, route, &self.keys_manager, best_block_height)
}
- fn send_payment_internal(&self, route: &Route, payment_hash: PaymentHash, payment_secret: &Option<PaymentSecret>, keysend_preimage: Option<PaymentPreimage>, payment_id: PaymentId, recv_value_msat: Option<u64>, onion_session_privs: Vec<[u8; 32]>) -> Result<(), PaymentSendFailure> {
- if route.paths.len() < 1 {
- return Err(PaymentSendFailure::ParameterError(APIError::InvalidRoute{err: "There must be at least one path to send over"}));
- }
- if payment_secret.is_none() && route.paths.len() > 1 {
- return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError{err: "Payment secret is required for multi-path payments".to_string()}));
- }
- let mut total_value = 0;
- let our_node_id = self.get_our_node_id();
- let mut path_errs = Vec::with_capacity(route.paths.len());
- 'path_check: for path in route.paths.iter() {
- if path.len() < 1 || path.len() > 20 {
- path_errs.push(Err(APIError::InvalidRoute{err: "Path didn't go anywhere/had bogus size"}));
- continue 'path_check;
- }
- for (idx, hop) in path.iter().enumerate() {
- if idx != path.len() - 1 && hop.pubkey == our_node_id {
- path_errs.push(Err(APIError::InvalidRoute{err: "Path went through us but wasn't a simple rebalance loop to us"}));
- continue 'path_check;
- }
- }
- total_value += path.last().unwrap().fee_msat;
- path_errs.push(Ok(()));
- }
- if path_errs.iter().any(|e| e.is_err()) {
- return Err(PaymentSendFailure::PathParameterError(path_errs));
- }
- if let Some(amt_msat) = recv_value_msat {
- debug_assert!(amt_msat >= total_value);
- total_value = amt_msat;
- }
-
- let cur_height = self.best_block.read().unwrap().height() + 1;
- let mut results = Vec::new();
- debug_assert_eq!(route.paths.len(), onion_session_privs.len());
- for (path, session_priv) in route.paths.iter().zip(onion_session_privs.into_iter()) {
- let mut path_res = self.send_payment_along_path(&path, &route.payment_params, &payment_hash, payment_secret, total_value, cur_height, payment_id, &keysend_preimage, session_priv);
- match path_res {
- Ok(_) => {},
- Err(APIError::MonitorUpdateInProgress) => {
- // While a MonitorUpdateInProgress is an Err(_), the payment is still
- // considered "in flight" and we shouldn't remove it from the
- // PendingOutboundPayment set.
- },
- Err(_) => {
- let mut pending_outbounds = self.pending_outbound_payments.lock().unwrap();
- if let Some(payment) = pending_outbounds.get_mut(&payment_id) {
- let removed = payment.remove(&session_priv, Some(path));
- debug_assert!(removed, "This can't happen as the payment has an entry for this path added by callers");
- } else {
- debug_assert!(false, "This can't happen as the payment was added by callers");
- path_res = Err(APIError::APIMisuseError { err: "Internal error: payment disappeared during processing. Please report this bug!".to_owned() });
- }
- }
- }
- results.push(path_res);
- }
- let mut has_ok = false;
- let mut has_err = false;
- let mut pending_amt_unsent = 0;
- let mut max_unsent_cltv_delta = 0;
- for (res, path) in results.iter().zip(route.paths.iter()) {
- if res.is_ok() { has_ok = true; }
- if res.is_err() { has_err = true; }
- if let &Err(APIError::MonitorUpdateInProgress) = res {
- // MonitorUpdateInProgress is inherently unsafe to retry, so we call it a
- // PartialFailure.
- has_err = true;
- has_ok = true;
- } else if res.is_err() {
- pending_amt_unsent += path.last().unwrap().fee_msat;
- max_unsent_cltv_delta = cmp::max(max_unsent_cltv_delta, path.last().unwrap().cltv_expiry_delta);
- }
- }
- if has_err && has_ok {
- Err(PaymentSendFailure::PartialFailure {
- results,
- payment_id,
- failed_paths_retry: if pending_amt_unsent != 0 {
- if let Some(payment_params) = &route.payment_params {
- Some(RouteParameters {
- payment_params: payment_params.clone(),
- final_value_msat: pending_amt_unsent,
- final_cltv_expiry_delta: max_unsent_cltv_delta,
- })
- } else { None }
- } else { None },
- })
- } else if has_err {
- // 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`.
- let removed = self.pending_outbound_payments.lock().unwrap().remove(&payment_id).is_some();
- debug_assert!(removed, "We should always have a pending payment to remove here");
- Err(PaymentSendFailure::AllFailedResendSafe(results.drain(..).map(|r| r.unwrap_err()).collect()))
- } else {
- Ok(())
- }
- }
/// Retries a payment along the given [`Route`].
///
/// [`send_payment`]: [`ChannelManager::send_payment`]
/// [`abandon_payment`]: [`ChannelManager::abandon_payment`]
pub fn retry_payment(&self, route: &Route, payment_id: PaymentId) -> Result<(), PaymentSendFailure> {
- const RETRY_OVERFLOW_PERCENTAGE: u64 = 10;
- for path in route.paths.iter() {
- if path.len() == 0 {
- return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
- err: "length-0 path in route".to_string()
- }))
- }
- }
-
- let mut onion_session_privs = Vec::with_capacity(route.paths.len());
- for _ in 0..route.paths.len() {
- onion_session_privs.push(self.keys_manager.get_secure_random_bytes());
- }
-
- let (total_msat, payment_hash, payment_secret) = {
- let mut outbounds = self.pending_outbound_payments.lock().unwrap();
- match outbounds.get_mut(&payment_id) {
- Some(payment) => {
- let res = match payment {
- PendingOutboundPayment::Retryable {
- total_msat, payment_hash, 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()
- }))
- }
- (*total_msat, *payment_hash, *payment_secret)
- },
- 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()
- }))
- },
- PendingOutboundPayment::Fulfilled { .. } => {
- return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
- err: "Payment already completed".to_owned()
- }));
- },
- PendingOutboundPayment::Abandoned { .. } => {
- return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
- err: "Payment already abandoned (with some HTLCs still pending)".to_owned()
- }));
- },
- };
- for (path, session_priv_bytes) in route.paths.iter().zip(onion_session_privs.iter()) {
- assert!(payment.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)),
- })),
- }
- };
- self.send_payment_internal(route, payment_hash, &payment_secret, None, payment_id, Some(total_msat), onion_session_privs)
+ let best_block_height = self.best_block.read().unwrap().height();
+ self.pending_outbound_payments.retry_payment_with_route(route, payment_id, &self.keys_manager, best_block_height,
+ |path, payment_params, payment_hash, payment_secret, total_value, cur_height, payment_id, keysend_preimage, session_priv|
+ self.send_payment_along_path(path, payment_params, payment_hash, payment_secret, total_value, cur_height, payment_id, keysend_preimage, session_priv))
}
/// Signals that no further retries for the given payment will occur.
/// [`Event::PaymentSent`]: events::Event::PaymentSent
pub fn abandon_payment(&self, payment_id: PaymentId) {
let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
-
- 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 {
- self.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"),
- });
- payment.remove();
- }
- }
+ if let Some(payment_failed_ev) = self.pending_outbound_payments.abandon_payment(payment_id) {
+ self.pending_events.lock().unwrap().push(payment_failed_ev);
}
}
///
/// [`send_payment`]: Self::send_payment
pub fn send_spontaneous_payment(&self, route: &Route, payment_preimage: Option<PaymentPreimage>, payment_id: PaymentId) -> Result<PaymentHash, PaymentSendFailure> {
- let preimage = match payment_preimage {
- Some(p) => p,
- None => PaymentPreimage(self.keys_manager.get_secure_random_bytes()),
- };
- let payment_hash = PaymentHash(Sha256::hash(&preimage.0).into_inner());
- let onion_session_privs = self.add_new_pending_payment(payment_hash, None, payment_id, &route)?;
-
- match self.send_payment_internal(route, payment_hash, &None, Some(preimage), payment_id, None, onion_session_privs) {
- Ok(()) => Ok(payment_hash),
- Err(e) => Err(e)
- }
+ let best_block_height = self.best_block.read().unwrap().height();
+ self.pending_outbound_payments.send_spontaneous_payment(route, payment_preimage, payment_id, &self.keys_manager, best_block_height,
+ |path, payment_params, payment_hash, payment_secret, total_value, cur_height, payment_id, keysend_preimage, session_priv|
+ self.send_payment_along_path(path, payment_params, payment_hash, payment_secret, total_value, cur_height, payment_id, keysend_preimage, session_priv))
}
/// Send a payment that is probing the given route for liquidity. We calculate the
/// [`PaymentHash`] of probes based on a static secret and a random [`PaymentId`], which allows
/// us to easily discern them from real payments.
pub fn send_probe(&self, hops: Vec<RouteHop>) -> Result<(PaymentHash, PaymentId), PaymentSendFailure> {
- let payment_id = PaymentId(self.keys_manager.get_secure_random_bytes());
-
- let payment_hash = self.probing_cookie_from_id(&payment_id);
-
- if hops.len() < 2 {
- return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
- err: "No need probing a path with less than two hops".to_string()
- }))
- }
-
- let route = Route { paths: vec![hops], payment_params: None };
- let onion_session_privs = self.add_new_pending_payment(payment_hash, None, payment_id, &route)?;
-
- match self.send_payment_internal(&route, payment_hash, &None, None, payment_id, None, onion_session_privs) {
- Ok(()) => Ok((payment_hash, payment_id)),
- Err(e) => Err(e)
- }
+ let best_block_height = self.best_block.read().unwrap().height();
+ self.pending_outbound_payments.send_probe(hops, self.probing_cookie_secret, &self.keys_manager, best_block_height,
+ |path, payment_params, payment_hash, payment_secret, total_value, cur_height, payment_id, keysend_preimage, session_priv|
+ self.send_payment_along_path(path, payment_params, payment_hash, payment_secret, total_value, cur_height, payment_id, keysend_preimage, session_priv))
}
/// Returns whether a payment with the given [`PaymentHash`] and [`PaymentId`] is, in fact, a
/// payment probe.
+ #[cfg(test)]
pub(crate) fn payment_is_probe(&self, payment_hash: &PaymentHash, payment_id: &PaymentId) -> bool {
- let target_payment_hash = self.probing_cookie_from_id(payment_id);
- target_payment_hash == *payment_hash
- }
-
- /// Returns the 'probing cookie' for the given [`PaymentId`].
- fn probing_cookie_from_id(&self, payment_id: &PaymentId) -> PaymentHash {
- let mut preimage = [0u8; 64];
- preimage[..32].copy_from_slice(&self.probing_cookie_secret);
- preimage[32..].copy_from_slice(&payment_id.0);
- PaymentHash(Sha256::hash(&preimage).into_inner())
+ outbound_payment::payment_is_probe(payment_hash, payment_id, self.probing_cookie_secret)
}
/// Handles the generation of a funding transaction, optionally (for tests) with a function
});
}
- fn remove_stale_resolved_payments(&self) {
- // If an outbound payment was completed, and no pending HTLCs remain, we should remove it
- // from the map. However, if we did that immediately when the last payment HTLC is claimed,
- // this could race the user making a duplicate send_payment call and our idempotency
- // guarantees would be violated. Instead, we wait a few timer ticks to do the actual
- // removal. This should be more than sufficient to ensure the idempotency of any
- // `send_payment` calls that were made at the same time the `PaymentSent` event was being
- // processed.
- let mut pending_outbound_payments = self.pending_outbound_payments.lock().unwrap();
- let pending_events = self.pending_events.lock().unwrap();
- pending_outbound_payments.retain(|payment_id, payment| {
- if let PendingOutboundPayment::Fulfilled { session_privs, timer_ticks_without_htlcs, .. } = payment {
- let mut no_remaining_entries = session_privs.is_empty();
- if no_remaining_entries {
- for ev in pending_events.iter() {
- match ev {
- events::Event::PaymentSent { payment_id: Some(ev_payment_id), .. } |
- events::Event::PaymentPathSuccessful { payment_id: ev_payment_id, .. } |
- events::Event::PaymentPathFailed { payment_id: Some(ev_payment_id), .. } => {
- if payment_id == ev_payment_id {
- no_remaining_entries = false;
- break;
- }
- },
- _ => {},
- }
- }
- }
- if no_remaining_entries {
- *timer_ticks_without_htlcs += 1;
- *timer_ticks_without_htlcs <= IDEMPOTENCY_TIMEOUT_TICKS
- } else {
- *timer_ticks_without_htlcs = 0;
- true
- }
- } else { true }
- });
- }
-
/// Performs actions which should happen on startup and roughly once per minute thereafter.
///
/// This currently includes:
let _ = handle_error!(self, err, counterparty_node_id);
}
- self.remove_stale_resolved_payments();
+ self.pending_outbound_payments.remove_stale_resolved_payments(&self.pending_events);
// Technically we don't need to do this here, but if we have holding cell entries in a
// channel that need freeing, it's better to do that here and block a background task
// being fully configured. See the docs for `ChannelManagerReadArgs` for more.
match source {
HTLCSource::OutboundRoute { ref path, ref session_priv, ref payment_id, ref payment_params, .. } => {
- let mut session_priv_bytes = [0; 32];
- session_priv_bytes.copy_from_slice(&session_priv[..]);
- let mut outbounds = self.pending_outbound_payments.lock().unwrap();
- let mut all_paths_failed = false;
- let mut full_failure_ev = None;
- if let hash_map::Entry::Occupied(mut payment) = outbounds.entry(*payment_id) {
- if !payment.get_mut().remove(&session_priv_bytes, Some(&path)) {
- log_trace!(self.logger, "Received duplicative fail for HTLC with payment_hash {}", log_bytes!(payment_hash.0));
- return;
- }
- if payment.get().is_fulfilled() {
- log_trace!(self.logger, "Received failure of HTLC with payment_hash {} after payment completion", log_bytes!(payment_hash.0));
- return;
- }
- 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"),
- });
- payment.remove();
- }
- }
- } else {
- log_trace!(self.logger, "Received duplicative fail for HTLC with payment_hash {}", log_bytes!(payment_hash.0));
- return;
- }
- let mut retry = if let Some(payment_params_data) = payment_params {
- let path_last_hop = path.last().expect("Outbound payments must have had a valid path");
- Some(RouteParameters {
- payment_params: payment_params_data.clone(),
- final_value_msat: path_last_hop.fee_msat,
- final_cltv_expiry_delta: path_last_hop.cltv_expiry_delta,
- })
- } else { None };
- log_trace!(self.logger, "Failing outbound payment HTLC with payment_hash {}", log_bytes!(payment_hash.0));
-
- let path_failure = {
-#[cfg(test)]
- let (network_update, short_channel_id, payment_retryable, onion_error_code, onion_error_data) = onion_error.decode_onion_failure(&self.secp_ctx, &self.logger, &source);
-#[cfg(not(test))]
- let (network_update, short_channel_id, payment_retryable, _, _) = onion_error.decode_onion_failure(&self.secp_ctx, &self.logger, &source);
-
- if self.payment_is_probe(payment_hash, &payment_id) {
- if !payment_retryable {
- events::Event::ProbeSuccessful {
- payment_id: *payment_id,
- payment_hash: payment_hash.clone(),
- path: path.clone(),
- }
- } else {
- events::Event::ProbeFailed {
- payment_id: *payment_id,
- payment_hash: payment_hash.clone(),
- path: path.clone(),
- short_channel_id,
- }
- }
- } else {
- // TODO: If we decided to blame ourselves (or one of our channels) in
- // process_onion_failure we should close that channel as it implies our
- // next-hop is needlessly blaming us!
- if let Some(scid) = short_channel_id {
- retry.as_mut().map(|r| r.payment_params.previously_failed_channels.push(scid));
- }
- events::Event::PaymentPathFailed {
- payment_id: Some(*payment_id),
- payment_hash: payment_hash.clone(),
- payment_failed_permanently: !payment_retryable,
- network_update,
- all_paths_failed,
- path: path.clone(),
- short_channel_id,
- retry,
- #[cfg(test)]
- error_code: onion_error_code,
- #[cfg(test)]
- error_data: onion_error_data
- }
- }
- };
- let mut pending_events = self.pending_events.lock().unwrap();
- pending_events.push(path_failure);
- if let Some(ev) = full_failure_ev { pending_events.push(ev); }
+ self.pending_outbound_payments.fail_htlc(source, payment_hash, onion_error, path, session_priv, payment_id, payment_params, self.probing_cookie_secret, &self.secp_ctx, &self.pending_events, &self.logger);
},
HTLCSource::PreviousHopData(HTLCPreviousHopData { ref short_channel_id, ref htlc_id, ref incoming_packet_shared_secret, ref phantom_shared_secret, ref outpoint }) => {
log_trace!(self.logger, "Failing HTLC with payment_hash {} backwards from us with {:?}", log_bytes!(payment_hash.0), onion_error);
}
}
- fn finalize_claims(&self, mut sources: Vec<HTLCSource>) {
- let mut outbounds = self.pending_outbound_payments.lock().unwrap();
- let mut pending_events = self.pending_events.lock().unwrap();
- for source in sources.drain(..) {
- if let HTLCSource::OutboundRoute { session_priv, payment_id, path, .. } = source {
- let mut session_priv_bytes = [0; 32];
- session_priv_bytes.copy_from_slice(&session_priv[..]);
- if let hash_map::Entry::Occupied(mut payment) = outbounds.entry(payment_id) {
- assert!(payment.get().is_fulfilled());
- if payment.get_mut().remove(&session_priv_bytes, None) {
- pending_events.push(
- events::Event::PaymentPathSuccessful {
- payment_id,
- payment_hash: payment.get().payment_hash(),
- path,
- }
- );
- }
- }
- }
- }
+ fn finalize_claims(&self, sources: Vec<HTLCSource>) {
+ self.pending_outbound_payments.finalize_claims(sources, &self.pending_events);
}
fn claim_funds_internal(&self, channel_state_lock: MutexGuard<ChannelHolder<<K::Target as KeysInterface>::Signer>>, source: HTLCSource, payment_preimage: PaymentPreimage, forwarded_htlc_value_msat: Option<u64>, from_onchain: bool, next_channel_id: [u8; 32]) {
match source {
HTLCSource::OutboundRoute { session_priv, payment_id, path, .. } => {
mem::drop(channel_state_lock);
- 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 let hash_map::Entry::Occupied(mut payment) = outbounds.entry(payment_id) {
- let mut pending_events = self.pending_events.lock().unwrap();
- if !payment.get().is_fulfilled() {
- let payment_hash = PaymentHash(Sha256::hash(&payment_preimage.0).into_inner());
- let fee_paid_msat = payment.get().get_pending_fee_msat();
- pending_events.push(
- events::Event::PaymentSent {
- payment_id: Some(payment_id),
- payment_preimage,
- payment_hash,
- fee_paid_msat,
- }
- );
- payment.get_mut().mark_fulfilled();
- }
-
- if from_onchain {
- // We currently immediately remove HTLCs which were fulfilled on-chain.
- // This could potentially lead to removing a pending payment too early,
- // with a reorg of one block causing us to re-add the fulfilled payment on
- // restart.
- // TODO: We should have a second monitor event that informs us of payments
- // irrevocably fulfilled.
- if payment.get_mut().remove(&session_priv_bytes, Some(&path)) {
- let payment_hash = Some(PaymentHash(Sha256::hash(&payment_preimage.0).into_inner()));
- pending_events.push(
- events::Event::PaymentPathSuccessful {
- payment_id,
- payment_hash,
- path,
- }
- );
- }
- }
- } else {
- log_trace!(self.logger, "Received duplicative fulfill for HTLC with payment_preimage {}", log_bytes!(payment_preimage.0));
- }
+ self.pending_outbound_payments.claim_htlc(payment_id, payment_preimage, session_priv, path, from_onchain, &self.pending_events, &self.logger);
},
HTLCSource::PreviousHopData(hop_data) => {
let prev_outpoint = hop_data.outpoint;
#[cfg(test)]
pub fn has_pending_payments(&self) -> bool {
- !self.pending_outbound_payments.lock().unwrap().is_empty()
+ self.pending_outbound_payments.has_pending_payments()
}
#[cfg(test)]
pub fn clear_pending_payments(&self) {
- self.pending_outbound_payments.lock().unwrap().clear()
+ self.pending_outbound_payments.clear_pending_payments()
}
/// Processes any events asynchronously in the order they were generated since the last call
(8, min_value_msat, required),
});
-impl_writeable_tlv_based_enum_upgradable!(PendingOutboundPayment,
- (0, Legacy) => {
- (0, session_privs, required),
- },
- (1, Fulfilled) => {
- (0, session_privs, required),
- (1, payment_hash, option),
- (3, timer_ticks_without_htlcs, (default_value, 0)),
- },
- (2, Retryable) => {
- (0, session_privs, required),
- (1, pending_fee_msat, option),
- (2, payment_hash, required),
- (4, payment_secret, option),
- (6, total_msat, required),
- (8, pending_amt_msat, required),
- (10, starting_block_height, required),
- },
- (3, Abandoned) => {
- (0, session_privs, required),
- (2, payment_hash, required),
- },
-);
-
impl<M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> Writeable for ChannelManager<M, T, K, F, L>
where M::Target: chain::Watch<<K::Target as KeysInterface>::Signer>,
T::Target: BroadcasterInterface,
let pending_inbound_payments = self.pending_inbound_payments.lock().unwrap();
let claimable_payments = self.claimable_payments.lock().unwrap();
- let pending_outbound_payments = self.pending_outbound_payments.lock().unwrap();
+ let pending_outbound_payments = self.pending_outbound_payments.pending_outbound_payments.lock().unwrap();
let mut htlc_purposes: Vec<&events::PaymentPurpose> = Vec::new();
(claimable_payments.claimable_htlcs.len() as u64).write(writer)?;
}),
inbound_payment_key: expanded_inbound_key,
pending_inbound_payments: Mutex::new(pending_inbound_payments),
- pending_outbound_payments: Mutex::new(pending_outbound_payments.unwrap()),
+ pending_outbound_payments: OutboundPayments { pending_outbound_payments: Mutex::new(pending_outbound_payments.unwrap()) },
pending_intercepted_htlcs: Mutex::new(pending_intercepted_htlcs.unwrap()),
forward_htlcs: Mutex::new(forward_htlcs),
// Use the utility function send_payment_along_path to send the payment with MPP data which
// indicates there are more HTLCs coming.
let cur_height = CHAN_CONFIRM_DEPTH + 1; // route_payment calls send_payment, which adds 1 to the current height. So we do the same here to match.
- let session_privs = nodes[0].node.add_new_pending_payment(our_payment_hash, Some(payment_secret), payment_id, &mpp_route).unwrap();
+ let session_privs = nodes[0].node.test_add_new_pending_payment(our_payment_hash, Some(payment_secret), payment_id, &mpp_route).unwrap();
nodes[0].node.send_payment_along_path(&mpp_route.paths[0], &route.payment_params, &our_payment_hash, &Some(payment_secret), 200_000, cur_height, payment_id, &None, session_privs[0]).unwrap();
check_added_monitors!(nodes[0], 1);
let mut events = nodes[0].node.get_and_clear_pending_msg_events();
let test_preimage = PaymentPreimage([42; 32]);
let mismatch_payment_hash = PaymentHash([43; 32]);
- let session_privs = nodes[0].node.add_new_pending_payment(mismatch_payment_hash, None, PaymentId(mismatch_payment_hash.0), &route).unwrap();
- nodes[0].node.send_payment_internal(&route, mismatch_payment_hash, &None, Some(test_preimage), PaymentId(mismatch_payment_hash.0), None, session_privs).unwrap();
+ let session_privs = nodes[0].node.test_add_new_pending_payment(mismatch_payment_hash, None, PaymentId(mismatch_payment_hash.0), &route).unwrap();
+ nodes[0].node.test_send_payment_internal(&route, mismatch_payment_hash, &None, Some(test_preimage), PaymentId(mismatch_payment_hash.0), None, session_privs).unwrap();
check_added_monitors!(nodes[0], 1);
let updates = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
let test_preimage = PaymentPreimage([42; 32]);
let test_secret = PaymentSecret([43; 32]);
let payment_hash = PaymentHash(Sha256::hash(&test_preimage.0).into_inner());
- let session_privs = nodes[0].node.add_new_pending_payment(payment_hash, Some(test_secret), PaymentId(payment_hash.0), &route).unwrap();
- nodes[0].node.send_payment_internal(&route, payment_hash, &Some(test_secret), Some(test_preimage), PaymentId(payment_hash.0), None, session_privs).unwrap();
+ let session_privs = nodes[0].node.test_add_new_pending_payment(payment_hash, Some(test_secret), PaymentId(payment_hash.0), &route).unwrap();
+ nodes[0].node.test_send_payment_internal(&route, payment_hash, &Some(test_secret), Some(test_preimage), PaymentId(payment_hash.0), None, session_privs).unwrap();
check_added_monitors!(nodes[0], 1);
let updates = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
--- /dev/null
+// This file is Copyright its original authors, visible in version control
+// history.
+//
+// This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
+// or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
+// You may not use this file except in accordance with one or both of these
+// licenses.
+
+//! Utilities to send payments and manage outbound payment information.
+
+use bitcoin::hashes::Hash;
+use bitcoin::hashes::sha256::Hash as Sha256;
+use bitcoin::secp256k1::{self, Secp256k1, SecretKey};
+
+use crate::chain::keysinterface::{KeysInterface, Recipient};
+use crate::ln::{PaymentHash, PaymentPreimage, PaymentSecret};
+use crate::ln::channelmanager::{HTLCSource, IDEMPOTENCY_TIMEOUT_TICKS, PaymentId};
+use crate::ln::msgs::DecodeError;
+use crate::ln::onion_utils::HTLCFailReason;
+use crate::routing::router::{PaymentParameters, Route, RouteHop, RouteParameters, RoutePath};
+use crate::util::errors::APIError;
+use crate::util::events;
+use crate::util::logger::Logger;
+
+use core::cmp;
+use core::ops::Deref;
+use crate::prelude::*;
+use crate::sync::Mutex;
+
+/// Stores the session_priv for each part of a payment that is still pending. For versions 0.0.102
+/// and later, also stores information for retrying the payment.
+pub(crate) enum PendingOutboundPayment {
+ Legacy {
+ session_privs: HashSet<[u8; 32]>,
+ },
+ Retryable {
+ session_privs: HashSet<[u8; 32]>,
+ payment_hash: PaymentHash,
+ payment_secret: Option<PaymentSecret>,
+ pending_amt_msat: u64,
+ /// Used to track the fee paid. Only present if the payment was serialized on 0.0.103+.
+ pending_fee_msat: Option<u64>,
+ /// The total payment amount across all paths, used to verify that a retry is not overpaying.
+ total_msat: u64,
+ /// Our best known block height at the time this payment was initiated.
+ starting_block_height: u32,
+ },
+ /// When a pending payment is fulfilled, we continue tracking it until all pending HTLCs have
+ /// been resolved. This ensures we don't look up pending payments in ChannelMonitors on restart
+ /// and add a pending payment that was already fulfilled.
+ Fulfilled {
+ session_privs: HashSet<[u8; 32]>,
+ payment_hash: Option<PaymentHash>,
+ 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) https://github.com/lightningdevkit/rust-lightning/issues/1164
+ Abandoned {
+ session_privs: HashSet<[u8; 32]>,
+ payment_hash: PaymentHash,
+ },
+}
+
+impl PendingOutboundPayment {
+ pub(super) fn is_fulfilled(&self) -> bool {
+ match self {
+ PendingOutboundPayment::Fulfilled { .. } => true,
+ _ => false,
+ }
+ }
+ pub(super) fn abandoned(&self) -> bool {
+ match self {
+ PendingOutboundPayment::Abandoned { .. } => true,
+ _ => false,
+ }
+ }
+ fn get_pending_fee_msat(&self) -> Option<u64> {
+ match self {
+ PendingOutboundPayment::Retryable { pending_fee_msat, .. } => pending_fee_msat.clone(),
+ _ => None,
+ }
+ }
+
+ fn payment_hash(&self) -> Option<PaymentHash> {
+ match self {
+ PendingOutboundPayment::Legacy { .. } => None,
+ PendingOutboundPayment::Retryable { payment_hash, .. } => Some(*payment_hash),
+ PendingOutboundPayment::Fulfilled { payment_hash, .. } => *payment_hash,
+ PendingOutboundPayment::Abandoned { payment_hash, .. } => Some(*payment_hash),
+ }
+ }
+
+ fn mark_fulfilled(&mut self) {
+ let mut session_privs = HashSet::new();
+ core::mem::swap(&mut session_privs, match self {
+ PendingOutboundPayment::Legacy { session_privs } |
+ PendingOutboundPayment::Retryable { session_privs, .. } |
+ PendingOutboundPayment::Fulfilled { session_privs, .. } |
+ PendingOutboundPayment::Abandoned { session_privs, .. }
+ => session_privs,
+ });
+ let payment_hash = self.payment_hash();
+ *self = PendingOutboundPayment::Fulfilled { session_privs, payment_hash, timer_ticks_without_htlcs: 0 };
+ }
+
+ fn mark_abandoned(&mut self) -> Result<(), ()> {
+ let mut session_privs = HashSet::new();
+ let our_payment_hash;
+ core::mem::swap(&mut session_privs, match self {
+ PendingOutboundPayment::Legacy { .. } |
+ PendingOutboundPayment::Fulfilled { .. } =>
+ return Err(()),
+ 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(())
+ }
+
+ /// panics if path is None and !self.is_fulfilled
+ fn remove(&mut self, session_priv: &[u8; 32], path: Option<&Vec<RouteHop>>) -> bool {
+ let remove_res = match self {
+ PendingOutboundPayment::Legacy { session_privs } |
+ PendingOutboundPayment::Retryable { session_privs, .. } |
+ PendingOutboundPayment::Fulfilled { session_privs, .. } |
+ PendingOutboundPayment::Abandoned { session_privs, .. } => {
+ session_privs.remove(session_priv)
+ }
+ };
+ if remove_res {
+ if let PendingOutboundPayment::Retryable { ref mut pending_amt_msat, ref mut pending_fee_msat, .. } = self {
+ let path = path.expect("Fulfilling a payment should always come with a path");
+ let path_last_hop = path.last().expect("Outbound payments must have had a valid path");
+ *pending_amt_msat -= path_last_hop.fee_msat;
+ if let Some(fee_msat) = pending_fee_msat.as_mut() {
+ *fee_msat -= path.get_path_fees();
+ }
+ }
+ }
+ remove_res
+ }
+
+ pub(super) fn insert(&mut self, session_priv: [u8; 32], path: &Vec<RouteHop>) -> bool {
+ let insert_res = match self {
+ PendingOutboundPayment::Legacy { session_privs } |
+ PendingOutboundPayment::Retryable { session_privs, .. } => {
+ session_privs.insert(session_priv)
+ }
+ PendingOutboundPayment::Fulfilled { .. } => false,
+ PendingOutboundPayment::Abandoned { .. } => false,
+ };
+ if insert_res {
+ if let PendingOutboundPayment::Retryable { ref mut pending_amt_msat, ref mut pending_fee_msat, .. } = self {
+ let path_last_hop = path.last().expect("Outbound payments must have had a valid path");
+ *pending_amt_msat += path_last_hop.fee_msat;
+ if let Some(fee_msat) = pending_fee_msat.as_mut() {
+ *fee_msat += path.get_path_fees();
+ }
+ }
+ }
+ insert_res
+ }
+
+ pub(super) fn remaining_parts(&self) -> usize {
+ match self {
+ PendingOutboundPayment::Legacy { session_privs } |
+ PendingOutboundPayment::Retryable { session_privs, .. } |
+ PendingOutboundPayment::Fulfilled { session_privs, .. } |
+ PendingOutboundPayment::Abandoned { session_privs, .. } => {
+ session_privs.len()
+ }
+ }
+ }
+}
+
+/// 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.
+#[derive(Clone, Debug)]
+pub enum PaymentSendFailure {
+ /// A parameter 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, 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
+ 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).
+ ///
+ /// 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
+ PathParameterError(Vec<Result<(), APIError>>),
+ /// 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.
+ ///
+ /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment
+ /// [`ChannelManager::retry_payment`]: crate::ln::channelmanager::ChannelManager::retry_payment
+ AllFailedResendSafe(Vec<APIError>),
+ /// 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`]).
+ ///
+ /// [`PaymentId`]: crate::ln::channelmanager::PaymentId
+ /// [`Event::PaymentSent`]: crate::util::events::Event::PaymentSent
+ /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment
+ 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.
+ ///
+ /// 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`].
+ ///
+ /// 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.
+ ///
+ /// [`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.
+ results: Vec<Result<(), APIError>>,
+ /// 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.
+ failed_paths_retry: Option<RouteParameters>,
+ /// The payment id for the payment, which is now at least partially pending.
+ payment_id: PaymentId,
+ },
+}
+
+pub(super) struct OutboundPayments {
+ pub(super) pending_outbound_payments: Mutex<HashMap<PaymentId, PendingOutboundPayment>>,
+}
+
+impl OutboundPayments {
+ pub(super) fn new() -> Self {
+ Self {
+ pending_outbound_payments: Mutex::new(HashMap::new())
+ }
+ }
+
+ pub(super) fn send_payment_with_route<K: Deref, F>(
+ &self, route: &Route, payment_hash: PaymentHash, payment_secret: &Option<PaymentSecret>,
+ payment_id: PaymentId, keys_manager: &K, best_block_height: u32, send_payment_along_path: F
+ ) -> Result<(), PaymentSendFailure>
+ where
+ K::Target: KeysInterface,
+ F: Fn(&Vec<RouteHop>, &Option<PaymentParameters>, &PaymentHash, &Option<PaymentSecret>, u64,
+ u32, PaymentId, &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
+ {
+ let onion_session_privs = self.add_new_pending_payment(payment_hash, *payment_secret, payment_id, route, keys_manager, best_block_height)?;
+ self.send_payment_internal(route, payment_hash, payment_secret, None, payment_id, None, onion_session_privs, keys_manager, best_block_height, send_payment_along_path)
+ }
+
+ pub(super) fn send_spontaneous_payment<K: Deref, F>(
+ &self, route: &Route, payment_preimage: Option<PaymentPreimage>, payment_id: PaymentId,
+ keys_manager: &K, best_block_height: u32, send_payment_along_path: F
+ ) -> Result<PaymentHash, PaymentSendFailure>
+ where
+ K::Target: KeysInterface,
+ F: Fn(&Vec<RouteHop>, &Option<PaymentParameters>, &PaymentHash, &Option<PaymentSecret>, u64,
+ u32, PaymentId, &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
+ {
+ let preimage = match payment_preimage {
+ Some(p) => p,
+ None => PaymentPreimage(keys_manager.get_secure_random_bytes()),
+ };
+ let payment_hash = PaymentHash(Sha256::hash(&preimage.0).into_inner());
+ let onion_session_privs = self.add_new_pending_payment(payment_hash, None, payment_id, &route, keys_manager, best_block_height)?;
+
+ match self.send_payment_internal(route, payment_hash, &None, Some(preimage), payment_id, None, onion_session_privs, keys_manager, best_block_height, send_payment_along_path) {
+ Ok(()) => Ok(payment_hash),
+ Err(e) => Err(e)
+ }
+ }
+
+ pub(super) fn retry_payment_with_route<K: Deref, F>(
+ &self, route: &Route, payment_id: PaymentId, keys_manager: &K, best_block_height: u32,
+ send_payment_along_path: F
+ ) -> Result<(), PaymentSendFailure>
+ where
+ K::Target: KeysInterface,
+ F: Fn(&Vec<RouteHop>, &Option<PaymentParameters>, &PaymentHash, &Option<PaymentSecret>, u64,
+ u32, PaymentId, &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
+ {
+ const RETRY_OVERFLOW_PERCENTAGE: u64 = 10;
+ for path in route.paths.iter() {
+ if path.len() == 0 {
+ return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
+ err: "length-0 path in route".to_string()
+ }))
+ }
+ }
+
+ let mut onion_session_privs = Vec::with_capacity(route.paths.len());
+ for _ in 0..route.paths.len() {
+ onion_session_privs.push(keys_manager.get_secure_random_bytes());
+ }
+
+ let (total_msat, payment_hash, payment_secret) = {
+ let mut outbounds = self.pending_outbound_payments.lock().unwrap();
+ match outbounds.get_mut(&payment_id) {
+ Some(payment) => {
+ let res = match payment {
+ PendingOutboundPayment::Retryable {
+ total_msat, payment_hash, 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()
+ }))
+ }
+ (*total_msat, *payment_hash, *payment_secret)
+ },
+ 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()
+ }))
+ },
+ PendingOutboundPayment::Fulfilled { .. } => {
+ return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
+ err: "Payment already completed".to_owned()
+ }));
+ },
+ PendingOutboundPayment::Abandoned { .. } => {
+ return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
+ err: "Payment already abandoned (with some HTLCs still pending)".to_owned()
+ }));
+ },
+ };
+ for (path, session_priv_bytes) in route.paths.iter().zip(onion_session_privs.iter()) {
+ assert!(payment.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)),
+ })),
+ }
+ };
+ self.send_payment_internal(route, payment_hash, &payment_secret, None, payment_id, Some(total_msat), onion_session_privs, keys_manager, best_block_height, send_payment_along_path)
+ }
+
+ pub(super) fn send_probe<K: Deref, F>(
+ &self, hops: Vec<RouteHop>, probing_cookie_secret: [u8; 32], keys_manager: &K,
+ best_block_height: u32, send_payment_along_path: F
+ ) -> Result<(PaymentHash, PaymentId), PaymentSendFailure>
+ where
+ K::Target: KeysInterface,
+ F: Fn(&Vec<RouteHop>, &Option<PaymentParameters>, &PaymentHash, &Option<PaymentSecret>, u64,
+ u32, PaymentId, &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
+ {
+ let payment_id = PaymentId(keys_manager.get_secure_random_bytes());
+
+ let payment_hash = probing_cookie_from_id(&payment_id, probing_cookie_secret);
+
+ if hops.len() < 2 {
+ return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
+ err: "No need probing a path with less than two hops".to_string()
+ }))
+ }
+
+ let route = Route { paths: vec![hops], payment_params: None };
+ let onion_session_privs = self.add_new_pending_payment(payment_hash, None, payment_id, &route, keys_manager, best_block_height)?;
+
+ match self.send_payment_internal(&route, payment_hash, &None, None, payment_id, None, onion_session_privs, keys_manager, best_block_height, send_payment_along_path) {
+ Ok(()) => Ok((payment_hash, payment_id)),
+ Err(e) => Err(e)
+ }
+ }
+
+ pub(super) fn add_new_pending_payment<K: Deref>(
+ &self, payment_hash: PaymentHash, payment_secret: Option<PaymentSecret>, payment_id: PaymentId,
+ route: &Route, keys_manager: &K, best_block_height: u32
+ ) -> Result<Vec<[u8; 32]>, PaymentSendFailure> where K::Target: KeysInterface {
+ let mut onion_session_privs = Vec::with_capacity(route.paths.len());
+ for _ in 0..route.paths.len() {
+ onion_session_privs.push(keys_manager.get_secure_random_bytes());
+ }
+
+ let mut pending_outbounds = self.pending_outbound_payments.lock().unwrap();
+ match pending_outbounds.entry(payment_id) {
+ hash_map::Entry::Occupied(_) => Err(PaymentSendFailure::DuplicatePayment),
+ hash_map::Entry::Vacant(entry) => {
+ let payment = entry.insert(PendingOutboundPayment::Retryable {
+ session_privs: HashSet::new(),
+ pending_amt_msat: 0,
+ pending_fee_msat: Some(0),
+ payment_hash,
+ payment_secret,
+ starting_block_height: best_block_height,
+ total_msat: route.get_total_amount(),
+ });
+
+ for (path, session_priv_bytes) in route.paths.iter().zip(onion_session_privs.iter()) {
+ assert!(payment.insert(*session_priv_bytes, path));
+ }
+
+ Ok(onion_session_privs)
+ },
+ }
+ }
+
+ fn send_payment_internal<K: Deref, F>(
+ &self, route: &Route, payment_hash: PaymentHash, payment_secret: &Option<PaymentSecret>,
+ keysend_preimage: Option<PaymentPreimage>, payment_id: PaymentId, recv_value_msat: Option<u64>,
+ onion_session_privs: Vec<[u8; 32]>, keys_manager: &K, best_block_height: u32,
+ send_payment_along_path: F) -> Result<(), PaymentSendFailure>
+ where
+ K::Target: KeysInterface,
+ F: Fn(&Vec<RouteHop>, &Option<PaymentParameters>, &PaymentHash, &Option<PaymentSecret>, u64,
+ u32, PaymentId, &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
+ {
+ if route.paths.len() < 1 {
+ return Err(PaymentSendFailure::ParameterError(APIError::InvalidRoute{err: "There must be at least one path to send over"}));
+ }
+ if payment_secret.is_none() && route.paths.len() > 1 {
+ return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError{err: "Payment secret is required for multi-path payments".to_string()}));
+ }
+ let mut total_value = 0;
+ let our_node_id = keys_manager.get_node_id(Recipient::Node).unwrap(); // TODO no unwrap
+ let mut path_errs = Vec::with_capacity(route.paths.len());
+ 'path_check: for path in route.paths.iter() {
+ if path.len() < 1 || path.len() > 20 {
+ path_errs.push(Err(APIError::InvalidRoute{err: "Path didn't go anywhere/had bogus size"}));
+ continue 'path_check;
+ }
+ for (idx, hop) in path.iter().enumerate() {
+ if idx != path.len() - 1 && hop.pubkey == our_node_id {
+ path_errs.push(Err(APIError::InvalidRoute{err: "Path went through us but wasn't a simple rebalance loop to us"}));
+ continue 'path_check;
+ }
+ }
+ total_value += path.last().unwrap().fee_msat;
+ path_errs.push(Ok(()));
+ }
+ if path_errs.iter().any(|e| e.is_err()) {
+ return Err(PaymentSendFailure::PathParameterError(path_errs));
+ }
+ if let Some(amt_msat) = recv_value_msat {
+ debug_assert!(amt_msat >= total_value);
+ total_value = amt_msat;
+ }
+
+ let cur_height = best_block_height + 1;
+ let mut results = Vec::new();
+ debug_assert_eq!(route.paths.len(), onion_session_privs.len());
+ for (path, session_priv) in route.paths.iter().zip(onion_session_privs.into_iter()) {
+ let mut path_res = send_payment_along_path(&path, &route.payment_params, &payment_hash, payment_secret, total_value, cur_height, payment_id, &keysend_preimage, session_priv);
+ match path_res {
+ Ok(_) => {},
+ Err(APIError::MonitorUpdateInProgress) => {
+ // While a MonitorUpdateInProgress is an Err(_), the payment is still
+ // considered "in flight" and we shouldn't remove it from the
+ // PendingOutboundPayment set.
+ },
+ Err(_) => {
+ let mut pending_outbounds = self.pending_outbound_payments.lock().unwrap();
+ if let Some(payment) = pending_outbounds.get_mut(&payment_id) {
+ let removed = payment.remove(&session_priv, Some(path));
+ debug_assert!(removed, "This can't happen as the payment has an entry for this path added by callers");
+ } else {
+ debug_assert!(false, "This can't happen as the payment was added by callers");
+ path_res = Err(APIError::APIMisuseError { err: "Internal error: payment disappeared during processing. Please report this bug!".to_owned() });
+ }
+ }
+ }
+ results.push(path_res);
+ }
+ let mut has_ok = false;
+ let mut has_err = false;
+ let mut pending_amt_unsent = 0;
+ let mut max_unsent_cltv_delta = 0;
+ for (res, path) in results.iter().zip(route.paths.iter()) {
+ if res.is_ok() { has_ok = true; }
+ if res.is_err() { has_err = true; }
+ if let &Err(APIError::MonitorUpdateInProgress) = res {
+ // MonitorUpdateInProgress is inherently unsafe to retry, so we call it a
+ // PartialFailure.
+ has_err = true;
+ has_ok = true;
+ } else if res.is_err() {
+ pending_amt_unsent += path.last().unwrap().fee_msat;
+ max_unsent_cltv_delta = cmp::max(max_unsent_cltv_delta, path.last().unwrap().cltv_expiry_delta);
+ }
+ }
+ if has_err && has_ok {
+ Err(PaymentSendFailure::PartialFailure {
+ results,
+ payment_id,
+ failed_paths_retry: if pending_amt_unsent != 0 {
+ if let Some(payment_params) = &route.payment_params {
+ Some(RouteParameters {
+ payment_params: payment_params.clone(),
+ final_value_msat: pending_amt_unsent,
+ final_cltv_expiry_delta: max_unsent_cltv_delta,
+ })
+ } else { None }
+ } else { None },
+ })
+ } else if has_err {
+ // 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`.
+ let removed = self.pending_outbound_payments.lock().unwrap().remove(&payment_id).is_some();
+ debug_assert!(removed, "We should always have a pending payment to remove here");
+ Err(PaymentSendFailure::AllFailedResendSafe(results.drain(..).map(|r| r.unwrap_err()).collect()))
+ } else {
+ Ok(())
+ }
+ }
+
+ #[cfg(test)]
+ pub(super) fn test_send_payment_internal<K: Deref, F>(
+ &self, route: &Route, payment_hash: PaymentHash, payment_secret: &Option<PaymentSecret>,
+ keysend_preimage: Option<PaymentPreimage>, payment_id: PaymentId, recv_value_msat: Option<u64>,
+ onion_session_privs: Vec<[u8; 32]>, keys_manager: &K, best_block_height: u32,
+ send_payment_along_path: F) -> Result<(), PaymentSendFailure>
+ where
+ K::Target: KeysInterface,
+ F: Fn(&Vec<RouteHop>, &Option<PaymentParameters>, &PaymentHash, &Option<PaymentSecret>, u64,
+ u32, PaymentId, &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>
+ {
+ self.send_payment_internal(route, payment_hash, payment_secret, keysend_preimage, payment_id,
+ recv_value_msat, onion_session_privs, keys_manager, best_block_height,
+ send_payment_along_path)
+ }
+
+ pub(super) fn claim_htlc<L: Deref>(
+ &self, payment_id: PaymentId, payment_preimage: PaymentPreimage, session_priv: SecretKey,
+ path: Vec<RouteHop>, from_onchain: bool, pending_events: &Mutex<Vec<events::Event>>, logger: &L)
+ where L::Target: Logger {
+ let mut session_priv_bytes = [0; 32];
+ session_priv_bytes.copy_from_slice(&session_priv[..]);
+ let mut outbounds = self.pending_outbound_payments.lock().unwrap();
+ let mut pending_events = pending_events.lock().unwrap();
+ if let hash_map::Entry::Occupied(mut payment) = outbounds.entry(payment_id) {
+ if !payment.get().is_fulfilled() {
+ let payment_hash = PaymentHash(Sha256::hash(&payment_preimage.0).into_inner());
+ let fee_paid_msat = payment.get().get_pending_fee_msat();
+ pending_events.push(
+ events::Event::PaymentSent {
+ payment_id: Some(payment_id),
+ payment_preimage,
+ payment_hash,
+ fee_paid_msat,
+ }
+ );
+ payment.get_mut().mark_fulfilled();
+ }
+
+ if from_onchain {
+ // We currently immediately remove HTLCs which were fulfilled on-chain.
+ // This could potentially lead to removing a pending payment too early,
+ // with a reorg of one block causing us to re-add the fulfilled payment on
+ // restart.
+ // TODO: We should have a second monitor event that informs us of payments
+ // irrevocably fulfilled.
+ if payment.get_mut().remove(&session_priv_bytes, Some(&path)) {
+ let payment_hash = Some(PaymentHash(Sha256::hash(&payment_preimage.0).into_inner()));
+ pending_events.push(
+ events::Event::PaymentPathSuccessful {
+ payment_id,
+ payment_hash,
+ path,
+ }
+ );
+ }
+ }
+ } else {
+ log_trace!(logger, "Received duplicative fulfill for HTLC with payment_preimage {}", log_bytes!(payment_preimage.0));
+ }
+ }
+
+ pub(super) fn finalize_claims(&self, sources: Vec<HTLCSource>, pending_events: &Mutex<Vec<events::Event>>) {
+ let mut outbounds = self.pending_outbound_payments.lock().unwrap();
+ let mut pending_events = pending_events.lock().unwrap();
+ for source in sources {
+ if let HTLCSource::OutboundRoute { session_priv, payment_id, path, .. } = source {
+ let mut session_priv_bytes = [0; 32];
+ session_priv_bytes.copy_from_slice(&session_priv[..]);
+ if let hash_map::Entry::Occupied(mut payment) = outbounds.entry(payment_id) {
+ assert!(payment.get().is_fulfilled());
+ if payment.get_mut().remove(&session_priv_bytes, None) {
+ pending_events.push(
+ events::Event::PaymentPathSuccessful {
+ payment_id,
+ payment_hash: payment.get().payment_hash(),
+ path,
+ }
+ );
+ }
+ }
+ }
+ }
+ }
+
+ pub(super) fn remove_stale_resolved_payments(&self, pending_events: &Mutex<Vec<events::Event>>) {
+ // If an outbound payment was completed, and no pending HTLCs remain, we should remove it
+ // from the map. However, if we did that immediately when the last payment HTLC is claimed,
+ // this could race the user making a duplicate send_payment call and our idempotency
+ // guarantees would be violated. Instead, we wait a few timer ticks to do the actual
+ // removal. This should be more than sufficient to ensure the idempotency of any
+ // `send_payment` calls that were made at the same time the `PaymentSent` event was being
+ // processed.
+ let mut pending_outbound_payments = self.pending_outbound_payments.lock().unwrap();
+ let pending_events = pending_events.lock().unwrap();
+ pending_outbound_payments.retain(|payment_id, payment| {
+ if let PendingOutboundPayment::Fulfilled { session_privs, timer_ticks_without_htlcs, .. } = payment {
+ let mut no_remaining_entries = session_privs.is_empty();
+ if no_remaining_entries {
+ for ev in pending_events.iter() {
+ match ev {
+ events::Event::PaymentSent { payment_id: Some(ev_payment_id), .. } |
+ events::Event::PaymentPathSuccessful { payment_id: ev_payment_id, .. } |
+ events::Event::PaymentPathFailed { payment_id: Some(ev_payment_id), .. } => {
+ if payment_id == ev_payment_id {
+ no_remaining_entries = false;
+ break;
+ }
+ },
+ _ => {},
+ }
+ }
+ }
+ if no_remaining_entries {
+ *timer_ticks_without_htlcs += 1;
+ *timer_ticks_without_htlcs <= IDEMPOTENCY_TIMEOUT_TICKS
+ } else {
+ *timer_ticks_without_htlcs = 0;
+ true
+ }
+ } else { true }
+ });
+ }
+
+ pub(super) fn fail_htlc<L: Deref>(
+ &self, source: &HTLCSource, payment_hash: &PaymentHash, onion_error: &HTLCFailReason,
+ path: &Vec<RouteHop>, session_priv: &SecretKey, payment_id: &PaymentId,
+ payment_params: &Option<PaymentParameters>, probing_cookie_secret: [u8; 32],
+ secp_ctx: &Secp256k1<secp256k1::All>, pending_events: &Mutex<Vec<events::Event>>, logger: &L)
+ where L::Target: Logger {
+ let mut session_priv_bytes = [0; 32];
+ session_priv_bytes.copy_from_slice(&session_priv[..]);
+ let mut outbounds = self.pending_outbound_payments.lock().unwrap();
+ let mut all_paths_failed = false;
+ let mut full_failure_ev = None;
+ 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
+ }
+ if payment.get().is_fulfilled() {
+ log_trace!(logger, "Received failure of HTLC with payment_hash {} after payment completion", log_bytes!(payment_hash.0));
+ return
+ }
+ 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"),
+ });
+ payment.remove();
+ }
+ }
+ } else {
+ log_trace!(logger, "Received duplicative fail for HTLC with payment_hash {}", log_bytes!(payment_hash.0));
+ return
+ }
+ let mut retry = if let Some(payment_params_data) = payment_params {
+ let path_last_hop = path.last().expect("Outbound payments must have had a valid path");
+ Some(RouteParameters {
+ payment_params: payment_params_data.clone(),
+ final_value_msat: path_last_hop.fee_msat,
+ final_cltv_expiry_delta: path_last_hop.cltv_expiry_delta,
+ })
+ } else { None };
+ log_trace!(logger, "Failing outbound payment HTLC with payment_hash {}", log_bytes!(payment_hash.0));
+
+ let path_failure = {
+ #[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);
+
+ if payment_is_probe(payment_hash, &payment_id, probing_cookie_secret) {
+ if !payment_retryable {
+ events::Event::ProbeSuccessful {
+ payment_id: *payment_id,
+ payment_hash: payment_hash.clone(),
+ path: path.clone(),
+ }
+ } else {
+ events::Event::ProbeFailed {
+ payment_id: *payment_id,
+ payment_hash: payment_hash.clone(),
+ path: path.clone(),
+ short_channel_id,
+ }
+ }
+ } else {
+ // TODO: If we decided to blame ourselves (or one of our channels) in
+ // process_onion_failure we should close that channel as it implies our
+ // next-hop is needlessly blaming us!
+ if let Some(scid) = short_channel_id {
+ retry.as_mut().map(|r| r.payment_params.previously_failed_channels.push(scid));
+ }
+ events::Event::PaymentPathFailed {
+ payment_id: Some(*payment_id),
+ payment_hash: payment_hash.clone(),
+ payment_failed_permanently: !payment_retryable,
+ network_update,
+ all_paths_failed,
+ path: path.clone(),
+ short_channel_id,
+ retry,
+ #[cfg(test)]
+ error_code: onion_error_code,
+ #[cfg(test)]
+ error_data: onion_error_data
+ }
+ }
+ };
+ let mut pending_events = pending_events.lock().unwrap();
+ pending_events.push(path_failure);
+ if let Some(ev) = full_failure_ev { pending_events.push(ev); }
+ }
+
+ pub(super) fn abandon_payment(&self, payment_id: PaymentId) -> Option<events::Event> {
+ let mut failed_ev = None;
+ 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 {
+ payment_id,
+ payment_hash: payment.get().payment_hash().expect("PendingOutboundPayments::RetriesExceeded always has a payment hash set"),
+ });
+ payment.remove();
+ }
+ }
+ }
+ failed_ev
+ }
+
+ #[cfg(test)]
+ pub fn has_pending_payments(&self) -> bool {
+ !self.pending_outbound_payments.lock().unwrap().is_empty()
+ }
+
+ #[cfg(test)]
+ pub fn clear_pending_payments(&self) {
+ self.pending_outbound_payments.lock().unwrap().clear()
+ }
+}
+
+/// Returns whether a payment with the given [`PaymentHash`] and [`PaymentId`] is, in fact, a
+/// payment probe.
+pub(super) fn payment_is_probe(payment_hash: &PaymentHash, payment_id: &PaymentId,
+ probing_cookie_secret: [u8; 32]) -> bool
+{
+ let target_payment_hash = probing_cookie_from_id(payment_id, probing_cookie_secret);
+ target_payment_hash == *payment_hash
+}
+
+/// Returns the 'probing cookie' for the given [`PaymentId`].
+fn probing_cookie_from_id(payment_id: &PaymentId, probing_cookie_secret: [u8; 32]) -> PaymentHash {
+ let mut preimage = [0u8; 64];
+ preimage[..32].copy_from_slice(&probing_cookie_secret);
+ preimage[32..].copy_from_slice(&payment_id.0);
+ PaymentHash(Sha256::hash(&preimage).into_inner())
+}
+
+impl_writeable_tlv_based_enum_upgradable!(PendingOutboundPayment,
+ (0, Legacy) => {
+ (0, session_privs, required),
+ },
+ (1, Fulfilled) => {
+ (0, session_privs, required),
+ (1, payment_hash, option),
+ (3, timer_ticks_without_htlcs, (default_value, 0)),
+ },
+ (2, Retryable) => {
+ (0, session_privs, required),
+ (1, pending_fee_msat, option),
+ (2, payment_hash, required),
+ (4, payment_secret, option),
+ (6, total_msat, required),
+ (8, pending_amt_msat, required),
+ (10, starting_block_height, required),
+ },
+ (3, Abandoned) => {
+ (0, session_privs, required),
+ (2, payment_hash, required),
+ },
+);
projects / rust-lightning / commitdiff