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Test that we won't retry over previously failed blinded paths.
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valentinewallace committed Jan 12, 2024
1 parent f5b88c1 commit 1a7f79d
Showing 1 changed file with 106 additions and 1 deletion.
107 changes: 106 additions & 1 deletion lightning/src/ln/blinded_payment_tests.rs
Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,7 @@
use bitcoin::secp256k1::{PublicKey, Secp256k1, SecretKey};
use crate::blinded_path::BlindedPath;
use crate::blinded_path::payment::{ForwardNode, ForwardTlvs, PaymentConstraints, PaymentRelay, ReceiveTlvs};
use crate::events::{HTLCDestination, MessageSendEvent, MessageSendEventsProvider};
use crate::events::{Event, HTLCDestination, MessageSendEvent, MessageSendEventsProvider, PaymentFailureReason};
use crate::ln::PaymentSecret;
use crate::ln::channelmanager;
use crate::ln::channelmanager::{PaymentId, RecipientOnionFields};
Expand Down Expand Up @@ -708,3 +708,108 @@ fn do_multi_hop_receiver_fail(check: ReceiveCheckFail) {
expect_payment_failed_conditions(&nodes[0], payment_hash, false,
PaymentFailedConditions::new().expected_htlc_error_data(INVALID_ONION_BLINDING, &[0; 32]));
}

#[test]
fn blinded_path_retries() {
let chanmon_cfgs = create_chanmon_cfgs(4);
// Make one blinded path's fees slightly higher so they are tried in a deterministic order.
let mut higher_fee_chan_cfg = test_default_channel_config();
higher_fee_chan_cfg.channel_config.forwarding_fee_base_msat += 1;
let node_cfgs = create_node_cfgs(4, &chanmon_cfgs);
let node_chanmgrs = create_node_chanmgrs(4, &node_cfgs, &[None, None, Some(higher_fee_chan_cfg), None]);
let mut nodes = create_network(4, &node_cfgs, &node_chanmgrs);

// Create this network topology so nodes[0] has a blinded route hint to retry over.
// n1
// / \
// n0 n3
// \ /
// n2
create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 1_000_000, 0);
create_announced_chan_between_nodes_with_value(&nodes, 0, 2, 1_000_000, 0);
let chan_1_3 = create_announced_chan_between_nodes_with_value(&nodes, 1, 3, 1_000_000, 0);
let chan_2_3 = create_announced_chan_between_nodes_with_value(&nodes, 2, 3, 1_000_000, 0);

let amt_msat = 5000;
let (_, payment_hash, payment_secret) = get_payment_preimage_hash(&nodes[3], Some(amt_msat), None);
let route_params = {
let pay_params = PaymentParameters::blinded(
vec![
blinded_payment_path(payment_secret,
vec![nodes[1].node.get_our_node_id(), nodes[3].node.get_our_node_id()], &[&chan_1_3.0.contents],
&chanmon_cfgs[3].keys_manager
),
blinded_payment_path(payment_secret,
vec![nodes[2].node.get_our_node_id(), nodes[3].node.get_our_node_id()], &[&chan_2_3.0.contents],
&chanmon_cfgs[3].keys_manager
),
]
)
.with_bolt12_features(channelmanager::provided_bolt12_invoice_features(&UserConfig::default()))
.unwrap();
RouteParameters::from_payment_params_and_value(pay_params, amt_msat)
};

nodes[0].node.send_payment(payment_hash, RecipientOnionFields::spontaneous_empty(), PaymentId(payment_hash.0), route_params.clone(), Retry::Attempts(2)).unwrap();
check_added_monitors(&nodes[0], 1);
pass_along_route(&nodes[0], &[&[&nodes[1], &nodes[3]]], amt_msat, payment_hash, payment_secret);

macro_rules! fail_payment_back {
($intro_node: expr) => {
nodes[3].node.fail_htlc_backwards(&payment_hash);
expect_pending_htlcs_forwardable_conditions(
nodes[3].node.get_and_clear_pending_events(), &[HTLCDestination::FailedPayment { payment_hash }]
);
nodes[3].node.process_pending_htlc_forwards();
check_added_monitors!(nodes[3], 1);

let updates = get_htlc_update_msgs!(nodes[3], $intro_node.node.get_our_node_id());
assert_eq!(updates.update_fail_malformed_htlcs.len(), 1);
let update_malformed = &updates.update_fail_malformed_htlcs[0];
assert_eq!(update_malformed.sha256_of_onion, [0; 32]);
assert_eq!(update_malformed.failure_code, INVALID_ONION_BLINDING);
$intro_node.node.handle_update_fail_malformed_htlc(&nodes[3].node.get_our_node_id(), update_malformed);
do_commitment_signed_dance(&$intro_node, &nodes[3], &updates.commitment_signed, true, false);

let updates = get_htlc_update_msgs!($intro_node, nodes[0].node.get_our_node_id());
assert_eq!(updates.update_fail_htlcs.len(), 1);
nodes[0].node.handle_update_fail_htlc(&$intro_node.node.get_our_node_id(), &updates.update_fail_htlcs[0]);
do_commitment_signed_dance(&nodes[0], &$intro_node, &updates.commitment_signed, false, false);

let mut events = nodes[0].node.get_and_clear_pending_events();
assert_eq!(events.len(), 2);
match events[0] {
Event::PaymentPathFailed { payment_hash: ev_payment_hash, payment_failed_permanently, .. } => {
assert_eq!(payment_hash, ev_payment_hash);
assert_eq!(payment_failed_permanently, false);
},
_ => panic!("Unexpected event"),
}
match events[1] {
Event::PendingHTLCsForwardable { .. } => {},
_ => panic!("Unexpected event"),
}
nodes[0].node.process_pending_htlc_forwards();
}
}

fail_payment_back!(nodes[1]);

// Pass the retry along.
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[2], &nodes[3]], amt_msat, payment_hash, Some(payment_secret), msg_events.pop().unwrap(), true, None);

fail_payment_back!(nodes[2]);
let evs = nodes[0].node.get_and_clear_pending_events();
assert_eq!(evs.len(), 1);
match evs[0] {
Event::PaymentFailed { payment_hash: ev_payment_hash, reason, .. } => {
assert_eq!(ev_payment_hash, payment_hash);
// We have 1 retry attempt remaining, but we're out of blinded paths to try.
assert_eq!(reason, Some(PaymentFailureReason::RouteNotFound));
},
_ => panic!()
}
}

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