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Support auto-retrying keysend payments in ChannelManager #2002

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merged 3 commits into from
Feb 3, 2023
Merged

Support auto-retrying keysend payments in ChannelManager #2002

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c863350
Store keysend preimage in outbound payments
valentinewallace Jan 24, 2023
6b49af1
Support spontaneous payment retries in ChannelManager
valentinewallace Jan 24, 2023
9f01092
Spontaneous payments: make preimage construction more concise
valentinewallace Feb 3, 2023
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17 changes: 16 additions & 1 deletion lightning/src/ln/channelmanager.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -2558,7 +2558,21 @@ where
/// [`send_payment`]: Self::send_payment
pub fn send_spontaneous_payment(&self, route: &Route, payment_preimage: Option<PaymentPreimage>, payment_id: PaymentId) -> Result<PaymentHash, PaymentSendFailure> {
let best_block_height = self.best_block.read().unwrap().height();
self.pending_outbound_payments.send_spontaneous_payment(route, payment_preimage, payment_id, &self.entropy_source, &self.node_signer, best_block_height,
self.pending_outbound_payments.send_spontaneous_payment_with_route(
route, payment_preimage, payment_id, &self.entropy_source, &self.node_signer,
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))
}

/// Similar to [`ChannelManager::send_spontaneous_payment`], but will automatically find a route
/// based on `route_params` and retry failed payment paths based on `retry_strategy`.
pub fn send_spontaneous_payment_with_retry(&self, payment_preimage: Option<PaymentPreimage>, payment_id: PaymentId, route_params: RouteParameters, retry_strategy: Retry) -> Result<PaymentHash, PaymentSendFailure> {
let best_block_height = self.best_block.read().unwrap().height();
self.pending_outbound_payments.send_spontaneous_payment(payment_preimage, payment_id,
retry_strategy, route_params, &self.router, self.list_usable_channels(),
self.compute_inflight_htlcs(), &self.entropy_source, &self.node_signer, best_block_height,
&self.logger,
|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))
}
Expand Down Expand Up @@ -7367,6 +7381,7 @@ where
session_privs: [session_priv_bytes].iter().map(|a| *a).collect(),
payment_hash: htlc.payment_hash,
payment_secret,
keysend_preimage: None, // only used for retries, and we'll never retry on startup
pending_amt_msat: path_amt,
pending_fee_msat: Some(path_fee),
total_msat: path_amt,
Expand Down
65 changes: 47 additions & 18 deletions lightning/src/ln/outbound_payment.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -48,6 +48,7 @@ pub(crate) enum PendingOutboundPayment {
session_privs: HashSet<[u8; 32]>,
payment_hash: PaymentHash,
payment_secret: Option<PaymentSecret>,
keysend_preimage: Option<PaymentPreimage>,
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>,
Expand Down Expand Up @@ -415,7 +416,7 @@ impl OutboundPayments {
F: Fn(&Vec<RouteHop>, &Option<PaymentParameters>, &PaymentHash, &Option<PaymentSecret>, u64,
u32, PaymentId, &Option<PaymentPreimage>, [u8; 32]) -> Result<(), APIError>,
{
self.pay_internal(payment_id, Some((payment_hash, payment_secret, retry_strategy)),
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 })
Expand All @@ -432,13 +433,39 @@ impl OutboundPayments {
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, None, None, entropy_source, best_block_height)?;
let onion_session_privs = self.add_new_pending_payment(payment_hash, *payment_secret, payment_id, None, route, None, None, 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)
.map_err(|e| { self.remove_outbound_if_all_failed(payment_id, &e); e })
}

pub(super) fn send_spontaneous_payment<ES: Deref, NS: Deref, F>(
pub(super) fn send_spontaneous_payment<R: Deref, ES: Deref, NS: Deref, F, L: Deref>(
&self, payment_preimage: Option<PaymentPreimage>, payment_id: PaymentId,
retry_strategy: Retry, route_params: RouteParameters, router: &R,
first_hops: Vec<ChannelDetails>, inflight_htlcs: InFlightHtlcs, entropy_source: &ES,
node_signer: &NS, best_block_height: u32, logger: &L, send_payment_along_path: F
Comment on lines +445 to +446
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Unrelated this PR, but may want to consider using the Payer abstraction here and throughout in the future to reduce the number of parameters. Could possibly simplify the tests by using a custom function for send_payment_along_path instead of needing to setup ChannelManager... or maybe not yet if retries are still triggered in ChannelManager?

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Retries upon payment failure are triggered in ChannelManager but they could always be triggered manually for unit testing. Using Payer to reduce the number of params sgtm 👍

) -> Result<PaymentHash, PaymentSendFailure>
where
R::Target: Router,
ES::Target: EntropySource,
NS::Target: NodeSigner,
L::Target: Logger,
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(entropy_source.get_secure_random_bytes()),
};
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let payment_hash = PaymentHash(Sha256::hash(&preimage.0).into_inner());
self.pay_internal(payment_id, Some((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)
.map(|()| payment_hash)
.map_err(|e| { self.remove_outbound_if_all_failed(payment_id, &e); e })
}

pub(super) fn send_spontaneous_payment_with_route<ES: Deref, NS: Deref, F>(
&self, route: &Route, payment_preimage: Option<PaymentPreimage>, payment_id: PaymentId,
entropy_source: &ES, node_signer: &NS, best_block_height: u32, send_payment_along_path: F
) -> Result<PaymentHash, PaymentSendFailure>
Expand All @@ -453,7 +480,7 @@ impl OutboundPayments {
None => PaymentPreimage(entropy_source.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, None, None, entropy_source, best_block_height)?;
let onion_session_privs = self.add_new_pending_payment(payment_hash, None, payment_id, Some(preimage), &route, None, None, entropy_source, best_block_height)?;

match self.pay_route_internal(route, payment_hash, &None, Some(preimage), payment_id, None, onion_session_privs, node_signer, best_block_height, &send_payment_along_path) {
Ok(()) => Ok(payment_hash),
Expand Down Expand Up @@ -511,7 +538,7 @@ impl OutboundPayments {

fn pay_internal<R: Deref, NS: Deref, ES: Deref, F, L: Deref>(
&self, payment_id: PaymentId,
initial_send_info: Option<(PaymentHash, &Option<PaymentSecret>, Retry)>,
initial_send_info: Option<(PaymentHash, &Option<PaymentSecret>, Option<PaymentPreimage>, Retry)>,
route_params: RouteParameters, router: &R, first_hops: Vec<ChannelDetails>,
inflight_htlcs: InFlightHtlcs, entropy_source: &ES, node_signer: &NS, best_block_height: u32,
logger: &L, send_payment_along_path: &F,
Expand Down Expand Up @@ -539,8 +566,8 @@ impl OutboundPayments {
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, retry_strategy)) = initial_send_info {
let onion_session_privs = self.add_new_pending_payment(payment_hash, *payment_secret, payment_id, &route, Some(retry_strategy), Some(route_params.payment_params.clone()), entropy_source, best_block_height)?;
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)
Expand Down Expand Up @@ -596,21 +623,21 @@ impl OutboundPayments {
onion_session_privs.push(entropy_source.get_secure_random_bytes());
}

let (total_msat, payment_hash, payment_secret) = {
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 {
PendingOutboundPayment::Retryable {
total_msat, payment_hash, payment_secret, pending_amt_msat, ..
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()
}))
}
(*total_msat, *payment_hash, *payment_secret)
(*total_msat, *payment_hash, *payment_secret, *keysend_preimage)
Comment on lines +622 to +636
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Possible follow-up opportunity to improve code cleanliness here. The first pattern is the only one that doesn't return early. So some of the indentations can be reduced by getting rid of the res local variable (and thus moving up the match) and also the outer (total_msat, payment_hash, payment_secret, keysend_preimage) variables, though you'd have to drop the lock before calling pay_route_internal.

},
PendingOutboundPayment::Legacy { .. } => {
return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
Expand Down Expand Up @@ -645,7 +672,7 @@ impl OutboundPayments {
})),
}
};
self.pay_route_internal(route, payment_hash, &payment_secret, None, payment_id, Some(total_msat), onion_session_privs, node_signer, best_block_height, &send_payment_along_path)
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)
}

pub(super) fn send_probe<ES: Deref, NS: Deref, F>(
Expand All @@ -669,7 +696,7 @@ impl OutboundPayments {
}

let route = Route { paths: vec![hops], payment_params: None };
let onion_session_privs = self.add_new_pending_payment(payment_hash, None, payment_id, &route, None, None, entropy_source, best_block_height)?;
let onion_session_privs = self.add_new_pending_payment(payment_hash, None, payment_id, None, &route, None, None, entropy_source, best_block_height)?;

match self.pay_route_internal(&route, payment_hash, &None, None, payment_id, None, onion_session_privs, node_signer, best_block_height, &send_payment_along_path) {
Ok(()) => Ok((payment_hash, payment_id)),
Expand All @@ -685,13 +712,13 @@ impl OutboundPayments {
&self, payment_hash: PaymentHash, payment_secret: Option<PaymentSecret>, payment_id: PaymentId,
route: &Route, retry_strategy: Option<Retry>, entropy_source: &ES, best_block_height: u32
) -> Result<Vec<[u8; 32]>, PaymentSendFailure> where ES::Target: EntropySource {
self.add_new_pending_payment(payment_hash, payment_secret, payment_id, route, retry_strategy, None, entropy_source, best_block_height)
self.add_new_pending_payment(payment_hash, payment_secret, payment_id, None, route, retry_strategy, None, entropy_source, best_block_height)
}

pub(super) fn add_new_pending_payment<ES: Deref>(
&self, payment_hash: PaymentHash, payment_secret: Option<PaymentSecret>, payment_id: PaymentId,
route: &Route, retry_strategy: Option<Retry>, payment_params: Option<PaymentParameters>,
entropy_source: &ES, best_block_height: u32
keysend_preimage: Option<PaymentPreimage>, route: &Route, retry_strategy: Option<Retry>,
payment_params: Option<PaymentParameters>, entropy_source: &ES, best_block_height: u32
) -> Result<Vec<[u8; 32]>, PaymentSendFailure> where ES::Target: EntropySource {
let mut onion_session_privs = Vec::with_capacity(route.paths.len());
for _ in 0..route.paths.len() {
Expand All @@ -711,6 +738,7 @@ impl OutboundPayments {
pending_fee_msat: Some(0),
payment_hash,
payment_secret,
keysend_preimage,
starting_block_height: best_block_height,
total_msat: route.get_total_amount(),
});
Expand Down Expand Up @@ -1153,6 +1181,7 @@ impl_writeable_tlv_based_enum_upgradable!(PendingOutboundPayment,
(2, payment_hash, required),
(3, payment_params, option),
(4, payment_secret, option),
(5, keysend_preimage, option),
(6, total_msat, required),
(8, pending_amt_msat, required),
(10, starting_block_height, required),
Expand Down Expand Up @@ -1247,9 +1276,9 @@ mod tests {
Err(LightningError { err: String::new(), action: ErrorAction::IgnoreError }));

let err = if on_retry {
outbound_payments.add_new_pending_payment(PaymentHash([0; 32]), None, PaymentId([0; 32]),
&Route { paths: vec![], payment_params: None }, Some(Retry::Attempts(1)), Some(route_params.payment_params.clone()),
&&keys_manager, 0).unwrap();
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()
Expand Down
17 changes: 17 additions & 0 deletions lightning/src/ln/payment_tests.rs
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Expand Up @@ -1586,6 +1586,7 @@ fn do_test_intercepted_payment(test: InterceptTest) {
#[derive(PartialEq)]
enum AutoRetry {
Success,
Spontaneous,
FailAttempts,
FailTimeout,
FailOnRestart,
Expand All @@ -1594,6 +1595,7 @@ enum AutoRetry {
#[test]
fn automatic_retries() {
do_automatic_retries(AutoRetry::Success);
do_automatic_retries(AutoRetry::Spontaneous);
do_automatic_retries(AutoRetry::FailAttempts);
do_automatic_retries(AutoRetry::FailTimeout);
do_automatic_retries(AutoRetry::FailOnRestart);
Expand Down Expand Up @@ -1692,6 +1694,21 @@ fn do_automatic_retries(test: AutoRetry) {
assert_eq!(msg_events.len(), 1);
pass_along_path(&nodes[0], &[&nodes[1], &nodes[2]], amt_msat, payment_hash, Some(payment_secret), msg_events.pop().unwrap(), true, None);
claim_payment_along_route(&nodes[0], &[&[&nodes[1], &nodes[2]]], false, payment_preimage);
} else if test == AutoRetry::Spontaneous {
nodes[0].node.send_spontaneous_payment_with_retry(Some(payment_preimage), PaymentId(payment_hash.0), route_params, Retry::Attempts(1)).unwrap();
pass_failed_attempt_with_retry_along_path!(channel_id_2, true);

// Open a new channel with liquidity on the second hop so we can find a route for the retry
// attempt, since the initial second hop channel will be excluded from pathfinding
create_announced_chan_between_nodes(&nodes, 1, 2);

// We retry payments in `process_pending_htlc_forwards`
nodes[0].node.process_pending_htlc_forwards();
check_added_monitors!(nodes[0], 1);
let mut msg_events = nodes[0].node.get_and_clear_pending_msg_events();
assert_eq!(msg_events.len(), 1);
pass_along_path(&nodes[0], &[&nodes[1], &nodes[2]], amt_msat, payment_hash, None, msg_events.pop().unwrap(), true, Some(payment_preimage));
claim_payment_along_route(&nodes[0], &[&[&nodes[1], &nodes[2]]], false, payment_preimage);
} else if test == AutoRetry::FailAttempts {
// Ensure ChannelManager will not retry a payment if it has run out of payment attempts.
nodes[0].node.send_payment_with_retry(payment_hash, &Some(payment_secret), PaymentId(payment_hash.0), route_params, Retry::Attempts(1)).unwrap();
Expand Down