add test for handling failed RGB forward swaps

Author: Arshia-r-m

src/ldk.rs

@@ -111,6 +111,10 @@ pub(crate) const FEE_RATE: u64 = 7;
 pub(crate) const UTXO_SIZE_SAT: u32 = 32000;
 pub(crate) const MIN_CHANNEL_CONFIRMATIONS: u8 = 6;
 
+#[cfg(test)]
+pub(crate) static FORCE_NEXT_INTERCEPTED_SWAP_RGB_FORWARD_FAILURE: AtomicBool =
+    AtomicBool::new(false);
+
 pub(crate) struct LdkBackgroundServices {
     stop_processing: Arc<AtomicBool>,
     peer_manager: Arc<PeerManager>,
@@ -1276,14 +1280,26 @@ async fn handle_ldk_events(
             tracing::debug!("Swap is whitelisted, forwarding the htlc...");
             unlocked_state.update_taker_swap_status(&payment_hash, SwapStatus::Pending);
 
+            let outbound_rgb_payment = expected_outbound_rgb_payment;
+            #[cfg(test)]
+            let outbound_rgb_payment = {
+                let mut outbound_rgb_payment = outbound_rgb_payment;
+                if FORCE_NEXT_INTERCEPTED_SWAP_RGB_FORWARD_FAILURE.swap(false, Ordering::SeqCst) {
+                    if let Some((contract_id, _)) = outbound_rgb_payment {
+                        outbound_rgb_payment = Some((contract_id, u64::MAX));
+                    }
+                }
+                outbound_rgb_payment
+            };
+
             unlocked_state
                 .channel_manager
                 .forward_intercepted_htlc(
                     intercept_id,
                     channelmanager::NextHopForward::ShortChannelId(requested_next_hop_scid),
                     outbound_channel.counterparty.node_id,
                     expected_outbound_amount_msat,
-                    expected_outbound_rgb_payment,
+                    outbound_rgb_payment,
                 )
                 .expect("Forward should be valid");
         }

src/test/mod.rs

@@ -2029,6 +2029,7 @@ mod swap_roundtrip_buy_same_channel;
 mod swap_roundtrip_fail_amount_maker;
 mod swap_roundtrip_fail_amount_taker;
 mod swap_roundtrip_fail_btc2btc;
+mod swap_roundtrip_fail_forward;
 mod swap_roundtrip_fail_invalid_asset_from;
 mod swap_roundtrip_fail_invalid_asset_to;
 mod swap_roundtrip_fail_same_asset;

src/test/swap_roundtrip_fail_forward.rs

@@ -0,0 +1,99 @@
+use super::*;
+
+const TEST_DIR_BASE: &str = "tmp/swap_roundtrip_fail_forward/";
+
+#[serial_test::serial]
+#[tokio::test(flavor = "multi_thread", worker_threads = 1)]
+#[traced_test]
+async fn swap_fail_forward_marks_taker_failed() {
+    initialize();
+
+    let test_dir_node1 = format!("{TEST_DIR_BASE}node1");
+    let test_dir_node2 = format!("{TEST_DIR_BASE}node2");
+    let (node1_addr, _) = start_node(&test_dir_node1, NODE1_PEER_PORT, false).await;
+    let (node2_addr, _) = start_node(&test_dir_node2, NODE2_PEER_PORT, false).await;
+
+    fund_and_create_utxos(node1_addr, None).await;
+    fund_and_create_utxos(node2_addr, None).await;
+
+    let asset_id = issue_asset_nia(node2_addr).await.asset_id;
+
+    let node1_pubkey = node_info(node1_addr).await.pubkey;
+    let node2_pubkey = node_info(node2_addr).await.pubkey;
+
+    open_channel(
+        node1_addr,
+        &node2_pubkey,
+        Some(NODE2_PEER_PORT),
+        Some(5000000),
+        Some(546000),
+        None,
+        None,
+    )
+    .await;
+    open_channel(
+        node2_addr,
+        &node1_pubkey,
+        Some(NODE1_PEER_PORT),
+        None,
+        None,
+        Some(600),
+        Some(&asset_id),
+    )
+    .await;
+    wait_for_usable_channels(node1_addr, 2).await;
+    wait_for_usable_channels(node2_addr, 2).await;
+
+    println!("\nsetup swap");
+    let maker_addr = node1_addr;
+    let taker_addr = node2_addr;
+    let qty_from = 10;
+    let qty_to = 50000;
+    let maker_init_response =
+        maker_init(maker_addr, qty_from, Some(&asset_id), qty_to, None, 3600).await;
+    taker(taker_addr, maker_init_response.swapstring.clone()).await;
+
+    let swaps_maker = list_swaps(maker_addr).await;
+    assert!(swaps_maker.taker.is_empty());
+    assert_eq!(swaps_maker.maker.len(), 1);
+    assert_eq!(
+        swaps_maker.maker.first().unwrap().status,
+        SwapStatus::Waiting
+    );
+
+    let swaps_taker = list_swaps(taker_addr).await;
+    assert!(swaps_taker.maker.is_empty());
+    assert_eq!(swaps_taker.taker.len(), 1);
+    assert_eq!(
+        swaps_taker.taker.first().unwrap().status,
+        SwapStatus::Waiting
+    );
+
+    crate::ldk::FORCE_NEXT_INTERCEPTED_SWAP_RGB_FORWARD_FAILURE
+        .store(true, std::sync::atomic::Ordering::SeqCst);
+
+    println!("\nexecute swap");
+    maker_execute(
+        maker_addr,
+        maker_init_response.swapstring,
+        maker_init_response.payment_secret,
+        node2_pubkey,
+    )
+    .await;
+
+    wait_for_swap_status(
+        maker_addr,
+        &maker_init_response.payment_hash,
+        SwapStatus::Failed,
+    )
+    .await;
+
+    // This assertion documents the expected behavior and currently fails because the
+    // HTLCHandlingFailed event is ignored, leaving the taker swap stuck as Pending.
+    wait_for_swap_status(
+        taker_addr,
+        &maker_init_response.payment_hash,
+        SwapStatus::Failed,
+    )
+    .await;
+}