From 3e6297a664ba54164e47aa6be32b33227a912f2e Mon Sep 17 00:00:00 2001 From: Valentine Wallace Date: Tue, 28 Sep 2021 18:31:39 -0400 Subject: [PATCH] Expire outbound payments after 3 blocks if no parts are pending --- lightning/src/ln/channelmanager.rs | 14 +++++++ lightning/src/ln/functional_tests.rs | 55 ++++++++++++++++++++++++++++ 2 files changed, 69 insertions(+) diff --git a/lightning/src/ln/channelmanager.rs b/lightning/src/ln/channelmanager.rs index f8fd4d92e..e165134e8 100644 --- a/lightning/src/ln/channelmanager.rs +++ b/lightning/src/ln/channelmanager.rs @@ -413,6 +413,8 @@ enum PendingOutboundPayment { pending_amt_msat: 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, }, } @@ -1955,6 +1957,7 @@ impl ChannelMana pending_amt_msat: 0, payment_hash: *payment_hash, payment_secret: *payment_secret, + starting_block_height: self.best_block.read().unwrap().height(), total_msat: total_value, }); assert!(payment.insert(session_priv_bytes, path.last().unwrap().fee_msat)); @@ -4546,6 +4549,16 @@ where payment_secrets.retain(|_, inbound_payment| { inbound_payment.expiry_time > header.time as u64 }); + + let mut outbounds = self.pending_outbound_payments.lock().unwrap(); + outbounds.retain(|_, payment| { + const PAYMENT_EXPIRY_BLOCKS: u32 = 3; + if payment.remaining_parts() != 0 { return true } + if let PendingOutboundPayment::Retryable { starting_block_height, .. } = payment { + return *starting_block_height + PAYMENT_EXPIRY_BLOCKS > height + } + true + }); } fn get_relevant_txids(&self) -> Vec { @@ -5277,6 +5290,7 @@ impl_writeable_tlv_based_enum!(PendingOutboundPayment, (4, payment_secret, option), (6, total_msat, required), (8, pending_amt_msat, required), + (10, starting_block_height, required), }, ;); diff --git a/lightning/src/ln/functional_tests.rs b/lightning/src/ln/functional_tests.rs index a2a105758..11154405a 100644 --- a/lightning/src/ln/functional_tests.rs +++ b/lightning/src/ln/functional_tests.rs @@ -4317,6 +4317,9 @@ fn retry_single_path_payment() { // Rebalance the channel so the retry succeeds. send_payment(&nodes[2], &vec!(&nodes[1])[..], 3_000_000); + // Mine two blocks (we expire retries after 3, so this will check that we don't expire early) + connect_blocks(&nodes[0], 2); + // Retry the payment and make sure it succeeds. nodes[0].node.retry_payment(&route, payment_id).unwrap(); check_added_monitors!(nodes[0], 1); @@ -4326,6 +4329,58 @@ fn retry_single_path_payment() { claim_payment_along_route(&nodes[0], &[&[&nodes[1], &nodes[2]]], false, payment_preimage); } +#[test] +fn retry_expired_payment() { + let chanmon_cfgs = create_chanmon_cfgs(3); + let node_cfgs = create_node_cfgs(3, &chanmon_cfgs); + let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]); + let mut nodes = create_network(3, &node_cfgs, &node_chanmgrs); + + let _chan_0 = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known()); + let _chan_1 = create_announced_chan_between_nodes(&nodes, 2, 1, InitFeatures::known(), InitFeatures::known()); + // Rebalance to find a route + send_payment(&nodes[2], &vec!(&nodes[1])[..], 3_000_000); + + let logger = test_utils::TestLogger::new(); + let (_payment_preimage, payment_hash, payment_secret) = get_payment_preimage_hash!(nodes[2]); + let net_graph_msg_handler = &nodes[0].net_graph_msg_handler; + let route = get_route(&nodes[0].node.get_our_node_id(), &net_graph_msg_handler.network_graph, &nodes[2].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 100_000, TEST_FINAL_CLTV, &logger).unwrap(); + + // Rebalance so that the first hop fails. + send_payment(&nodes[1], &vec!(&nodes[2])[..], 2_000_000); + + // Make sure the payment fails on the first hop. + let payment_id = nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret)).unwrap(); + check_added_monitors!(nodes[0], 1); + let mut events = nodes[0].node.get_and_clear_pending_msg_events(); + assert_eq!(events.len(), 1); + let mut payment_event = SendEvent::from_event(events.pop().unwrap()); + nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]); + check_added_monitors!(nodes[1], 0); + commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false); + expect_pending_htlcs_forwardable!(nodes[1]); + expect_pending_htlcs_forwardable!(&nodes[1]); + let htlc_updates = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id()); + assert!(htlc_updates.update_add_htlcs.is_empty()); + assert_eq!(htlc_updates.update_fail_htlcs.len(), 1); + assert!(htlc_updates.update_fulfill_htlcs.is_empty()); + assert!(htlc_updates.update_fail_malformed_htlcs.is_empty()); + check_added_monitors!(nodes[1], 1); + nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &htlc_updates.update_fail_htlcs[0]); + commitment_signed_dance!(nodes[0], nodes[1], htlc_updates.commitment_signed, false); + expect_payment_failed!(nodes[0], payment_hash, false); + + // Mine blocks so the payment will have expired. + connect_blocks(&nodes[0], 3); + + // Retry the payment and make sure it errors as expected. + if let Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError { err })) = nodes[0].node.retry_payment(&route, payment_id) { + assert!(err.contains("not found")); + } else { + panic!("Unexpected error"); + } +} + #[test] fn test_dup_htlc_onchain_fails_on_reload() { // When a Channel is closed, any outbound HTLCs which were relayed through it are simply -- 2.39.5