[custom channels]: Fix bandwidth manager and other bugs

docs/examples/basic-price-oracle/go.mod

@@ -98,7 +98,7 @@ require (
 	github.com/lightninglabs/neutrino v0.16.1-0.20240425105051-602843d34ffd // indirect
 	github.com/lightninglabs/neutrino/cache v1.1.2 // indirect
 	github.com/lightningnetwork/lightning-onion v1.2.1-0.20240712235311-98bd56499dfb // indirect
-	github.com/lightningnetwork/lnd v0.18.4-beta.rc1 // indirect
+	github.com/lightningnetwork/lnd v0.18.4-beta.rc1.0.20241205204908-f312064bfbd5 // indirect
 	github.com/lightningnetwork/lnd/clock v1.1.1 // indirect
 	github.com/lightningnetwork/lnd/fn v1.2.3 // indirect
 	github.com/lightningnetwork/lnd/healthcheck v1.2.5 // indirect

docs/examples/basic-price-oracle/go.sum

@@ -432,8 +432,8 @@ github.com/lightninglabs/protobuf-go-hex-display v1.33.0-hex-display h1:Y2WiPkBS
 github.com/lightninglabs/protobuf-go-hex-display v1.33.0-hex-display/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
 github.com/lightningnetwork/lightning-onion v1.2.1-0.20240712235311-98bd56499dfb h1:yfM05S8DXKhuCBp5qSMZdtSwvJ+GFzl94KbXMNB1JDY=
 github.com/lightningnetwork/lightning-onion v1.2.1-0.20240712235311-98bd56499dfb/go.mod h1:c0kvRShutpj3l6B9WtTsNTBUtjSmjZXbJd9ZBRQOSKI=
-github.com/lightningnetwork/lnd v0.18.4-beta.rc1 h1:z6hFKvtbfo8udPrIb81GbSoKlUWd06d4LRxTkD19IMQ=
-github.com/lightningnetwork/lnd v0.18.4-beta.rc1/go.mod h1:nPRQzLla5uHPQFyyZn8r9Vgddkd23PBUDa9rggEPOfY=
+github.com/lightningnetwork/lnd v0.18.4-beta.rc1.0.20241205204908-f312064bfbd5 h1:YJ/DPJd3YyPWmvv5b74KdpCFi3uBMdmDei54AageGpc=
+github.com/lightningnetwork/lnd v0.18.4-beta.rc1.0.20241205204908-f312064bfbd5/go.mod h1:nPRQzLla5uHPQFyyZn8r9Vgddkd23PBUDa9rggEPOfY=
 github.com/lightningnetwork/lnd/clock v1.1.1 h1:OfR3/zcJd2RhH0RU+zX/77c0ZiOnIMsDIBjgjWdZgA0=
 github.com/lightningnetwork/lnd/clock v1.1.1/go.mod h1:mGnAhPyjYZQJmebS7aevElXKTFDuO+uNFFfMXK1W8xQ=
 github.com/lightningnetwork/lnd/fn v1.2.3 h1:Q1OrgNSgQynVheBNa16CsKVov1JI5N2AR6G07x9Mles=

go.mod

@@ -28,7 +28,7 @@ require (
 	github.com/lightninglabs/lightning-node-connect/hashmailrpc v1.0.2
 	github.com/lightninglabs/lndclient v0.18.4-7
 	github.com/lightninglabs/neutrino/cache v1.1.2
-	github.com/lightningnetwork/lnd v0.18.4-beta.rc1
+	github.com/lightningnetwork/lnd v0.18.4-beta.rc1.0.20241205204908-f312064bfbd5
 	github.com/lightningnetwork/lnd/cert v1.2.2
 	github.com/lightningnetwork/lnd/clock v1.1.1
 	github.com/lightningnetwork/lnd/fn v1.2.3

go.sum

@@ -500,8 +500,8 @@ github.com/lightninglabs/protobuf-go-hex-display v1.33.0-hex-display h1:Y2WiPkBS
 github.com/lightninglabs/protobuf-go-hex-display v1.33.0-hex-display/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
 github.com/lightningnetwork/lightning-onion v1.2.1-0.20240712235311-98bd56499dfb h1:yfM05S8DXKhuCBp5qSMZdtSwvJ+GFzl94KbXMNB1JDY=
 github.com/lightningnetwork/lightning-onion v1.2.1-0.20240712235311-98bd56499dfb/go.mod h1:c0kvRShutpj3l6B9WtTsNTBUtjSmjZXbJd9ZBRQOSKI=
-github.com/lightningnetwork/lnd v0.18.4-beta.rc1 h1:z6hFKvtbfo8udPrIb81GbSoKlUWd06d4LRxTkD19IMQ=
-github.com/lightningnetwork/lnd v0.18.4-beta.rc1/go.mod h1:nPRQzLla5uHPQFyyZn8r9Vgddkd23PBUDa9rggEPOfY=
+github.com/lightningnetwork/lnd v0.18.4-beta.rc1.0.20241205204908-f312064bfbd5 h1:YJ/DPJd3YyPWmvv5b74KdpCFi3uBMdmDei54AageGpc=
+github.com/lightningnetwork/lnd v0.18.4-beta.rc1.0.20241205204908-f312064bfbd5/go.mod h1:nPRQzLla5uHPQFyyZn8r9Vgddkd23PBUDa9rggEPOfY=
 github.com/lightningnetwork/lnd/cert v1.2.2 h1:71YK6hogeJtxSxw2teq3eGeuy4rHGKcFf0d0Uy4qBjI=
 github.com/lightningnetwork/lnd/cert v1.2.2/go.mod h1:jQmFn/Ez4zhDgq2hnYSw8r35bqGVxViXhX6Cd7HXM6U=
 github.com/lightningnetwork/lnd/clock v1.1.1 h1:OfR3/zcJd2RhH0RU+zX/77c0ZiOnIMsDIBjgjWdZgA0=

rpcserver.go

@@ -6819,13 +6819,9 @@ func marshallRfqEvent(eventInterface fn.Event) (*rfqrpc.RfqEvent, error) {
 		}, nil
 
 	case *rfq.PeerAcceptedSellQuoteEvent:
-		rpcAcceptedQuote, err := taprpc.MarshalAcceptedSellQuoteEvent(
+		rpcAcceptedQuote := taprpc.MarshalAcceptedSellQuoteEvent(
 			event,
 		)
-		if err != nil {
-			return nil, fmt.Errorf("error marshalling accepted "+
-				"sell quote event: %w", err)
-		}
 
 		eventRpc := &rfqrpc.RfqEvent_PeerAcceptedSellQuote{
 			PeerAcceptedSellQuote: &rfqrpc.PeerAcceptedSellQuoteEvent{
@@ -7036,9 +7032,9 @@ func (r *rpcServer) SendPayment(req *tchrpc.SendPaymentRequest,
 		// Continue below.
 
 	case req.RfqId != nil:
-		// Check if the provided rfq ID matches the expected length.
+		// Check if the provided RFQ ID matches the expected length.
 		if len(req.RfqId) != 32 {
-			return fmt.Errorf("rfq must be 32 bytes in length")
+			return fmt.Errorf("RFQ ID must be 32 bytes in length")
 		}
 
 		// Now let's try to perform an internal lookup to see if there's
@@ -7061,36 +7057,12 @@ func (r *rpcServer) SendPayment(req *tchrpc.SendPaymentRequest,
 				"accepted quote")
 		}
 
-		invoice, err := zpay32.Decode(
-			pReq.PaymentRequest, r.cfg.Lnd.ChainParams,
-		)
-		if err != nil {
-			return fmt.Errorf("error decoding payment request: %w",
-				err)
-		}
-
-		rate := quote.AssetRate.Rate
-
 		// Calculate the equivalent asset units for the given invoice
 		// amount based on the asset-to-BTC conversion rate.
-		numAssetUnits := rfqmath.MilliSatoshiToUnits(
-			*invoice.MilliSat, rate,
-		)
-
-		sellOrder := &rfqrpc.PeerAcceptedSellQuote{
-			Peer: quote.Peer.String(),
-			Id:   quote.ID[:],
-			Scid: uint64(quote.ID.Scid()),
-			BidAssetRate: &rfqrpc.FixedPoint{
-				Coefficient: rate.Coefficient.String(),
-				Scale:       uint32(rate.Scale),
-			},
-			AssetAmount: numAssetUnits.ToUint64(),
-			Expiry:      uint64(quote.AssetRate.Expiry.Unix()),
-		}
+		sellOrder := taprpc.MarshalAcceptedSellQuote(*quote)
 
 		// Send out the information about the quote on the stream.
-		err = stream.Send(&tchrpc.SendPaymentResponse{
+		err := stream.Send(&tchrpc.SendPaymentResponse{
 			Result: &tchrpc.SendPaymentResponse_AcceptedSellOrder{
 				AcceptedSellOrder: sellOrder,
 			},
@@ -7101,8 +7073,8 @@ func (r *rpcServer) SendPayment(req *tchrpc.SendPaymentRequest,
 		}
 
 		rpcsLog.Infof("Using quote for %v asset units at %v asset/BTC "+
-			"from peer %x with SCID %d", numAssetUnits,
-			rate.String(), quote.Peer, quote.ID.Scid())
+			"from peer %x with SCID %d", sellOrder.AssetAmount,
+			quote.AssetRate.String(), quote.Peer, quote.ID.Scid())
 
 		htlc := rfqmsg.NewHtlc(nil, fn.Some(quote.ID))
 
@@ -7243,15 +7215,9 @@ func (r *rpcServer) SendPayment(req *tchrpc.SendPaymentRequest,
 				err)
 		}
 
-		// Calculate the equivalent asset units for the given invoice
-		// amount based on the asset-to-BTC conversion rate.
-		numAssetUnits := rfqmath.MilliSatoshiToUnits(
-			*invoice.MilliSat, *assetRate,
-		)
-
 		rpcsLog.Infof("Got quote for %v asset units at %v asset/BTC "+
-			"from peer %x with SCID %d", numAssetUnits, assetRate,
-			peerPubKey, acceptedQuote.Scid)
+			"from peer %x with SCID %d", acceptedQuote.AssetAmount,
+			assetRate, peerPubKey, acceptedQuote.Scid)
 
 		var rfqID rfqmsg.ID
 		copy(rfqID[:], acceptedQuote.Id)

server.go

@@ -28,6 +28,7 @@ import (
 	"github.com/lightningnetwork/lnd/channeldb"
 	lfn "github.com/lightningnetwork/lnd/fn"
 	"github.com/lightningnetwork/lnd/funding"
+	"github.com/lightningnetwork/lnd/htlcswitch"
 	"github.com/lightningnetwork/lnd/input"
 	"github.com/lightningnetwork/lnd/lncfg"
 	"github.com/lightningnetwork/lnd/lnrpc"
@@ -37,7 +38,6 @@ import (
 	"github.com/lightningnetwork/lnd/lnwire"
 	"github.com/lightningnetwork/lnd/macaroons"
 	"github.com/lightningnetwork/lnd/msgmux"
-	"github.com/lightningnetwork/lnd/routing"
 	"github.com/lightningnetwork/lnd/sweep"
 	"github.com/lightningnetwork/lnd/tlv"
 	"google.golang.org/grpc"
@@ -696,14 +696,14 @@ func (s *Server) Stop() error {
 
 // A compile-time check to ensure that Server fully implements the
 // lnwallet.AuxLeafStore, lnd.AuxDataParser, lnwallet.AuxSigner,
-// msgmux.Endpoint, funding.AuxFundingController, routing.TlvTrafficShaper
+// msgmux.Endpoint, funding.AuxFundingController, htlcswitch.AuxTrafficShaper
 // and chancloser.AuxChanCloser interfaces.
 var _ lnwl.AuxLeafStore = (*Server)(nil)
 var _ lnd.AuxDataParser = (*Server)(nil)
 var _ lnwl.AuxSigner = (*Server)(nil)
 var _ msgmux.Endpoint = (*Server)(nil)
 var _ funding.AuxFundingController = (*Server)(nil)
-var _ routing.TlvTrafficShaper = (*Server)(nil)
+var _ htlcswitch.AuxTrafficShaper = (*Server)(nil)
 var _ chancloser.AuxChanCloser = (*Server)(nil)
 var _ lnwl.AuxContractResolver = (*Server)(nil)
 var _ sweep.AuxSweeper = (*Server)(nil)

tapchannel/aux_traffic_shaper.go

@@ -12,10 +12,10 @@ import (
 	"github.com/lightninglabs/taproot-assets/rfqmsg"
 	cmsg "github.com/lightninglabs/taproot-assets/tapchannelmsg"
 	lfn "github.com/lightningnetwork/lnd/fn"
+	"github.com/lightningnetwork/lnd/htlcswitch"
 	"github.com/lightningnetwork/lnd/input"
 	"github.com/lightningnetwork/lnd/lnwallet"
 	"github.com/lightningnetwork/lnd/lnwire"
-	"github.com/lightningnetwork/lnd/routing"
 	"github.com/lightningnetwork/lnd/tlv"
 )
 
@@ -84,8 +84,8 @@ func (s *AuxTrafficShaper) Stop() error {
 }
 
 // A compile-time check to ensure that AuxTrafficShaper fully implements the
-// routing.TlvTrafficShaper interface.
-var _ routing.TlvTrafficShaper = (*AuxTrafficShaper)(nil)
+// htlcswitch.AuxTrafficShaper interface.
+var _ htlcswitch.AuxTrafficShaper = (*AuxTrafficShaper)(nil)
 
 // ShouldHandleTraffic is called in order to check if the channel identified by
 // the provided channel ID is handled by the traffic shaper implementation. If
@@ -187,8 +187,8 @@ func (s *AuxTrafficShaper) PaymentBandwidth(htlcBlob,
 	if htlcAssetAmount != 0 && htlcAssetAmount <= localBalance {
 		// Check if the current link bandwidth can afford sending out
 		// the htlc amount without dipping into the channel reserve. If
-		// it goes below the reserve, we report zero bandwdith as we
-		// cannot push the htlc amount.
+		// it goes below the reserve, we report zero bandwidth as we
+		// cannot push the HTLC amount.
 		if linkBandwidth < htlcAmt {
 			return 0, nil
 		}
@@ -213,9 +213,21 @@ func (s *AuxTrafficShaper) PaymentBandwidth(htlcBlob,
 	// up the accepted quote and determine the outgoing bandwidth in
 	// satoshis based on the local asset balance.
 	rfqID := htlc.RfqID.ValOpt().UnsafeFromSome()
-	acceptedQuotes := s.cfg.RfqManager.PeerAcceptedSellQuotes()
-	quote, ok := acceptedQuotes[rfqID.Scid()]
-	if !ok {
+	acceptedSellQuotes := s.cfg.RfqManager.PeerAcceptedSellQuotes()
+	acceptedBuyQuotes := s.cfg.RfqManager.LocalAcceptedBuyQuotes()
+
+	sellQuote, isSellQuote := acceptedSellQuotes[rfqID.Scid()]
+	buyQuote, isBuyQuote := acceptedBuyQuotes[rfqID.Scid()]
+
+	var rate rfqmsg.AssetRate
+	switch {
+	case isSellQuote:
+		rate = sellQuote.AssetRate
+
+	case isBuyQuote:
+		rate = buyQuote.AssetRate
+
+	default:
 		return 0, fmt.Errorf("no accepted quote found for RFQ ID "+
 			"%x (SCID %d)", rfqID[:], rfqID.Scid())
 	}
@@ -224,7 +236,7 @@ func (s *AuxTrafficShaper) PaymentBandwidth(htlcBlob,
 	// expressed in milli-satoshis.
 	localBalanceFp := rfqmath.NewBigIntFixedPoint(localBalance, 0)
 	availableBalanceMsat := rfqmath.UnitsToMilliSatoshi(
-		localBalanceFp, quote.AssetRate.Rate,
+		localBalanceFp, rate.Rate,
 	)
 
 	// At this point we have acquired what we need to express the asset

tapchannel/commitment.go

@@ -363,20 +363,47 @@ func processAddEntry(htlc *DecodedDescriptor, ourBalance, theirBalance uint64,
 // non-dust satoshi balance. It also checks and returns whether we need a local
 // and/or remote anchor output.
 func SanityCheckAmounts(ourBalance, theirBalance btcutil.Amount,
-	ourAssetBalance, theirAssetBalance uint64, view *DecodedView,
-	chanType channeldb.ChannelType, whoseCommit lntypes.ChannelParty,
-	dustLimit btcutil.Amount) (bool, bool, error) {
+	ourAssetBalance, theirAssetBalance uint64, assetView,
+	nonAssetView *DecodedView, chanType channeldb.ChannelType,
+	whoseCommit lntypes.ChannelParty, dustLimit btcutil.Amount) (bool, bool,
+	error) {
 
 	log.Tracef("Sanity checking amounts, whoseCommit=%v, ourBalance=%d, "+
 		"theirBalance=%d, ourAssetBalance=%d, theirAssetBalance=%d",
 		whoseCommit, ourBalance, theirBalance, ourAssetBalance,
 		theirAssetBalance)
 
 	var (
-		numHTLCs int64
-		feePerKw = view.FeePerKw
+		numHTLCs uint64
+		feePerKw = assetView.FeePerKw
 	)
-	for _, entry := range view.OurUpdates {
+
+	// We need to count any non-dust BTC-only HTLCs too for determining
+	// whether we need a commitment anchor output. The assetView and
+	// nonAssetView are non-overlapping, so we can just sum the number of
+	// non-dust HTLCs in both.
+	for _, entry := range nonAssetView.OurUpdates {
+		if !lnwallet.HtlcIsDust(
+			chanType, false, whoseCommit, feePerKw,
+			entry.Amount.ToSatoshis(), dustLimit,
+		) {
+
+			numHTLCs++
+		}
+	}
+	for _, entry := range nonAssetView.TheirUpdates {
+		if !lnwallet.HtlcIsDust(
+			chanType, true, whoseCommit, feePerKw,
+			entry.Amount.ToSatoshis(), dustLimit,
+		) {
+
+			numHTLCs++
+		}
+	}
+
+	// And finally we check the asset HTLCs. Here we also enforce that an
+	// HTLC that's carrying an asset must be above dust.
+	for _, entry := range assetView.OurUpdates {
 		isDust := lnwallet.HtlcIsDust(
 			chanType, false, whoseCommit, feePerKw,
 			entry.Amount.ToSatoshis(), dustLimit,
@@ -391,7 +418,7 @@ func SanityCheckAmounts(ourBalance, theirBalance btcutil.Amount,
 
 		numHTLCs++
 	}
-	for _, entry := range view.TheirUpdates {
+	for _, entry := range assetView.TheirUpdates {
 		isDust := lnwallet.HtlcIsDust(
 			chanType, true, whoseCommit, feePerKw,
 			entry.Amount.ToSatoshis(), dustLimit,
@@ -488,7 +515,7 @@ func GenerateCommitmentAllocations(prevState *cmsg.Commitment,
 	// corresponding non-dust BTC output.
 	wantLocalAnchor, wantRemoteAnchor, err := SanityCheckAmounts(
 		ourBalance.ToSatoshis(), theirBalance.ToSatoshis(),
-		ourAssetBalance, theirAssetBalance, filteredView,
+		ourAssetBalance, theirAssetBalance, filteredView, nonAssetView,
 		chanState.ChanType, whoseCommit, dustLimit,
 	)
 	if err != nil {

taprpc/marshal.go

@@ -15,6 +15,8 @@ import (
 	"github.com/lightninglabs/taproot-assets/commitment"
 	"github.com/lightninglabs/taproot-assets/fn"
 	"github.com/lightninglabs/taproot-assets/rfq"
+	"github.com/lightninglabs/taproot-assets/rfqmath"
+	"github.com/lightninglabs/taproot-assets/rfqmsg"
 	"github.com/lightninglabs/taproot-assets/taprpc/rfqrpc"
 	"github.com/lightningnetwork/lnd/keychain"
 )
@@ -522,25 +524,37 @@ func MarshalAsset(ctx context.Context, a *asset.Asset,
 }
 
 // MarshalAcceptedSellQuoteEvent marshals a peer accepted sell quote event to
-// its rpc representation.
+// its RPC representation.
 func MarshalAcceptedSellQuoteEvent(
-	event *rfq.PeerAcceptedSellQuoteEvent) (*rfqrpc.PeerAcceptedSellQuote,
-	error) {
+	event *rfq.PeerAcceptedSellQuoteEvent) *rfqrpc.PeerAcceptedSellQuote {
+
+	return MarshalAcceptedSellQuote(event.SellAccept)
+}
+
+// MarshalAcceptedSellQuote marshals a peer accepted sell quote to its RPC
+// representation.
+func MarshalAcceptedSellQuote(
+	accept rfqmsg.SellAccept) *rfqrpc.PeerAcceptedSellQuote {
 
 	rpcAssetRate := &rfqrpc.FixedPoint{
-		Coefficient: event.AssetRate.Rate.Coefficient.String(),
-		Scale:       uint32(event.AssetRate.Rate.Scale),
+		Coefficient: accept.AssetRate.Rate.Coefficient.String(),
+		Scale:       uint32(accept.AssetRate.Rate.Scale),
 	}
 
-	// TODO(ffranr): Add SellRequest payment max amount to
-	//  PeerAcceptedSellQuote.
+	// Calculate the equivalent asset units for the given total BTC amount
+	// based on the asset-to-BTC conversion rate.
+	numAssetUnits := rfqmath.MilliSatoshiToUnits(
+		accept.Request.PaymentMaxAmt, accept.AssetRate.Rate,
+	)
+
 	return &rfqrpc.PeerAcceptedSellQuote{
-		Peer:         event.Peer.String(),
-		Id:           event.ID[:],
-		Scid:         uint64(event.ShortChannelId()),
+		Peer:         accept.Peer.String(),
+		Id:           accept.ID[:],
+		Scid:         uint64(accept.ShortChannelId()),
 		BidAssetRate: rpcAssetRate,
-		Expiry:       uint64(event.AssetRate.Expiry.Unix()),
-	}, nil
+		Expiry:       uint64(accept.AssetRate.Expiry.Unix()),
+		AssetAmount:  numAssetUnits.ScaleTo(0).ToUint64(),
+	}
 }
 
 // MarshalAcceptedBuyQuoteEvent marshals a peer accepted buy quote event to
@@ -636,14 +650,8 @@ func NewAddAssetSellOrderResponse(
 
 	switch e := event.(type) {
 	case *rfq.PeerAcceptedSellQuoteEvent:
-		rpcAcceptedQuote, err := MarshalAcceptedSellQuoteEvent(e)
-		if err != nil {
-			return nil, fmt.Errorf("unable to marshal accepted "+
-				"sell quote event to RPC: %w", err)
-		}
-
 		resp.Response = &rfqrpc.AddAssetSellOrderResponse_AcceptedQuote{
-			AcceptedQuote: rpcAcceptedQuote,
+			AcceptedQuote: MarshalAcceptedSellQuoteEvent(e),
 		}
 		return resp, nil