itest: assert invoice and payment HTLCs show custom data

With this commit we sporadically assert in our itests that the outgoing
HTLCs for a payment and the incoming HTLCs of an invoice show the custom
channel data JSON with the actual asset amounts.

Author: guggero

itest/assets_test.go

@@ -33,6 +33,7 @@ import (
 	"github.com/lightninglabs/taproot-assets/tapscript"
 	"github.com/lightningnetwork/lnd/fn"
 	"github.com/lightningnetwork/lnd/lnrpc"
+	"github.com/lightningnetwork/lnd/lnrpc/invoicesrpc"
 	"github.com/lightningnetwork/lnd/lnrpc/routerrpc"
 	"github.com/lightningnetwork/lnd/lntest/rpc"
 	"github.com/lightningnetwork/lnd/lntest/wait"
@@ -924,6 +925,52 @@ func createAssetInvoice(t *testing.T, dstRfqPeer, dst *HarnessNode,
 	return resp.InvoiceResult
 }
 
+// assertInvoiceHtlcAssets makes sure the invoice with the given hash shows the
+// individual HTLCs that arrived for it and that they show the correct asset
+// amounts for the given ID when decoded.
+func assertInvoiceHtlcAssets(t *testing.T, node *HarnessNode,
+	addedInvoice *lnrpc.AddInvoiceResponse, assetID []byte,
+	assetAmount uint64) {
+
+	ctxb := context.Background()
+	ctxt, cancel := context.WithTimeout(ctxb, defaultTimeout)
+	defer cancel()
+
+	invoice, err := node.InvoicesClient.LookupInvoiceV2(
+		ctxt, &invoicesrpc.LookupInvoiceMsg{
+			InvoiceRef: &invoicesrpc.LookupInvoiceMsg_PaymentAddr{
+				PaymentAddr: addedInvoice.PaymentAddr,
+			},
+		},
+	)
+	require.NoError(t, err)
+	require.NotEmpty(t, invoice.Htlcs)
+
+	t.Logf("Asset invoice: %v", toProtoJSON(t, invoice))
+
+	targetID := hex.EncodeToString(assetID)
+
+	var totalAssetAmount uint64
+	for _, htlc := range invoice.Htlcs {
+		require.NotEmpty(t, htlc.CustomChannelData)
+
+		jsonHtlc := &rfqmsg.JsonHtlc{}
+		err := json.Unmarshal(htlc.CustomChannelData, jsonHtlc)
+		require.NoError(t, err)
+
+		for _, balance := range jsonHtlc.Balances {
+			if balance.AssetID != targetID {
+				continue
+			}
+
+			totalAssetAmount += balance.Amount
+		}
+	}
+
+	// Due to rounding we allow up to 1 unit of error.
+	require.InDelta(t, assetAmount, totalAssetAmount, 1)
+}
+
 // assertPaymentHtlcAssets makes sure the payment with the given hash shows the
 // individual HTLCs that arrived for it and that they show the correct asset
 // amounts for the given ID when decoded.

itest/litd_custom_channels_test.go

@@ -243,6 +243,16 @@ func testCustomChannelsLarge(_ context.Context, net *NetworkHarness,
 	payInvoiceWithAssets(t.t, charlie, dave, invoiceResp3, assetID, false)
 	logBalance(t.t, nodes, assetID, "after invoice 3")
 
+	// Make sure the invoice on the receiver side and the payment on the
+	// sender side show the individual HTLCs that arrived for it and that
+	// they show the correct asset amounts when decoded.
+	assertInvoiceHtlcAssets(
+		t.t, dave, invoiceResp3, assetID, largeInvoiceAmount,
+	)
+	assertPaymentHtlcAssets(
+		t.t, charlie, invoiceResp3.RHash, assetID, largeInvoiceAmount,
+	)
+
 	// We keysend the rest, so that all the balance is on Dave's side.
 	charlieRemainingBalance := charlieFundingAmount - largeInvoiceAmount -
 		fabiaInvoiceAssetAmount/2
@@ -422,6 +432,16 @@ func testCustomChannels(_ context.Context, net *NetworkHarness,
 	payInvoiceWithAssets(t.t, dave, charlie, invoiceResp, assetID, true)
 	logBalance(t.t, nodes, assetID, "after invoice back")
 
+	// Make sure the invoice on the receiver side and the payment on the
+	// sender side show the individual HTLCs that arrived for it and that
+	// they show the correct asset amounts when decoded.
+	assertInvoiceHtlcAssets(
+		t.t, charlie, invoiceResp, assetID, charlieInvoiceAmount,
+	)
+	assertPaymentHtlcAssets(
+		t.t, dave, invoiceResp.RHash, assetID, charlieInvoiceAmount,
+	)
+
 	charlieAssetBalance += charlieInvoiceAmount
 	daveAssetBalance -= charlieInvoiceAmount
 
@@ -897,6 +917,16 @@ func testCustomChannelsGroupedAsset(_ context.Context, net *NetworkHarness,
 	payInvoiceWithAssets(t.t, charlie, dave, invoiceResp, assetID, true)
 	logBalance(t.t, nodes, assetID, "after invoice")
 
+	// Make sure the invoice on the receiver side and the payment on the
+	// sender side show the individual HTLCs that arrived for it and that
+	// they show the correct asset amounts when decoded.
+	assertInvoiceHtlcAssets(
+		t.t, dave, invoiceResp, assetID, daveInvoiceAssetAmount,
+	)
+	assertPaymentHtlcAssets(
+		t.t, charlie, invoiceResp.RHash, assetID, daveInvoiceAssetAmount,
+	)
+
 	charlieAssetBalance -= daveInvoiceAssetAmount
 	daveAssetBalance += daveInvoiceAssetAmount
 
@@ -1876,27 +1906,38 @@ func testCustomChannelsLiquidityEdgeCases(_ context.Context,
 		"invoice, multi-hop)")
 
 	// Edge case: Big asset invoice paid by direct peer with assets.
+	const bigAssetAmount = 100_000
 	invoiceResp := createAssetInvoice(
-		t.t, charlie, dave, 100_000, assetID,
+		t.t, charlie, dave, bigAssetAmount, assetID,
 	)
-
 	payInvoiceWithAssets(t.t, charlie, dave, invoiceResp, assetID, false)
 
 	logBalance(t.t, nodes, assetID, "after big asset payment (asset "+
 		"invoice, direct)")
 
+	// Make sure the invoice on the receiver side and the payment on the
+	// sender side show the individual HTLCs that arrived for it and that
+	// they show the correct asset amounts when decoded.
+	assertInvoiceHtlcAssets(
+		t.t, dave, invoiceResp, assetID, bigAssetAmount,
+	)
+	assertPaymentHtlcAssets(
+		t.t, charlie, invoiceResp.RHash, assetID, bigAssetAmount,
+	)
+
 	// Edge case: Big normal invoice, paid by direct channel peer with
 	// assets.
+	const hugeAssetAmount = 1_000_000
 	_ = createAndPayNormalInvoice(
-		t.t, dave, charlie, charlie, 1_000_000, assetID, true,
+		t.t, dave, charlie, charlie, hugeAssetAmount, assetID, true,
 	)
 
 	logBalance(t.t, nodes, assetID, "after big asset payment (btc "+
 		"invoice, direct)")
 
 	// Dave sends 200k assets and 2k sats to Yara.
 	sendAssetKeySendPayment(
-		t.t, dave, yara, 200_000, assetID,
+		t.t, dave, yara, 2*bigAssetAmount, assetID,
 		fn.None[int64](), lnrpc.Payment_SUCCEEDED,
 		fn.None[lnrpc.PaymentFailureReason](),
 	)
@@ -1909,7 +1950,7 @@ func testCustomChannelsLiquidityEdgeCases(_ context.Context,
 	// channels, where the total asset value exceeds the btc capacity of the
 	// channels.
 	invoiceResp = createAssetInvoice(
-		t.t, dave, charlie, 100_000, assetID,
+		t.t, dave, charlie, bigAssetAmount, assetID,
 	)
 
 	payInvoiceWithAssets(t.t, yara, dave, invoiceResp, assetID, false)