multi: add SubscribeHtlcEvents call

Author: GeorgeTsagk

chain_bridge.go

@@ -18,6 +18,7 @@ import (
 	"github.com/lightninglabs/taproot-assets/tapgarden"
 	"github.com/lightningnetwork/lnd/chainntnfs"
 	"github.com/lightningnetwork/lnd/funding"
+	"github.com/lightningnetwork/lnd/lnrpc/routerrpc"
 	"github.com/lightningnetwork/lnd/lnwallet/chainfee"
 	"github.com/lightningnetwork/lnd/lnwire"
 	"github.com/lightningnetwork/lnd/routing/route"
@@ -376,9 +377,19 @@ func (l *LndRouterClient) DeleteLocalAlias(ctx context.Context, alias,
 	return l.lnd.Router.XDeleteLocalChanAlias(ctx, alias, baseScid)
 }
 
+// SubscribeHtlcEvents subscribes to a stream of events related to
+// HTLC updates.
+func (l *LndRouterClient) SubscribeHtlcEvents(
+	ctx context.Context) (<-chan *routerrpc.HtlcEvent,
+	<-chan error, error) {
+
+	return l.lnd.Router.SubscribeHtlcEvents(ctx)
+}
+
 // Ensure LndRouterClient implements the rfq.HtlcInterceptor interface.
 var _ rfq.HtlcInterceptor = (*LndRouterClient)(nil)
 var _ rfq.ScidAliasManager = (*LndRouterClient)(nil)
+var _ rfq.HtlcSubscriber = (*LndRouterClient)(nil)
 
 // LndInvoicesClient is an LND invoices RPC client.
 type LndInvoicesClient struct {

rfq/manager.go

@@ -72,6 +72,10 @@ type ManagerCfg struct {
 	// intercept and accept/reject HTLCs.
 	HtlcInterceptor HtlcInterceptor
 
+	// HtlcSubscriber is a subscriber that is used to retrieve live HTLC
+	// event updates.
+	HtlcSubscriber HtlcSubscriber
+
 	// PriceOracle is the price oracle that the RFQ manager will use to
 	// determine whether a quote is accepted or rejected.
 	PriceOracle PriceOracle
@@ -207,6 +211,7 @@ func (m *Manager) startSubsystems(ctx context.Context) error {
 	m.orderHandler, err = NewOrderHandler(OrderHandlerCfg{
 		CleanupInterval:  CacheCleanupInterval,
 		HtlcInterceptor:  m.cfg.HtlcInterceptor,
+		HtlcSubscriber:   m.cfg.HtlcSubscriber,
 		AcceptHtlcEvents: m.acceptHtlcEvents,
 	})
 	if err != nil {

rfq/order.go

@@ -14,6 +14,7 @@ import (
 	"github.com/lightninglabs/taproot-assets/rfqmath"
 	"github.com/lightninglabs/taproot-assets/rfqmsg"
 	"github.com/lightningnetwork/lnd/input"
+	"github.com/lightningnetwork/lnd/lnrpc/routerrpc"
 	"github.com/lightningnetwork/lnd/lnutils"
 	"github.com/lightningnetwork/lnd/lnwallet"
 	"github.com/lightningnetwork/lnd/lnwire"
@@ -843,3 +844,12 @@ type HtlcInterceptor interface {
 	// to respond to HTLCs.
 	InterceptHtlcs(context.Context, lndclient.HtlcInterceptHandler) error
 }
+
+// HtlcSubscriber is an interface that contains the function necessary for
+// retrieving live HTLC event updates.
+type HtlcSubscriber interface {
+	// SubscribeHtlcEvents subscribes to a stream of events related to
+	// HTLC updates.
+	SubscribeHtlcEvents(ctx context.Context) (<-chan *routerrpc.HtlcEvent,
+		<-chan error, error)
+}

tapcfg/server.go

@@ -395,6 +395,7 @@ func genServerConfig(cfg *Config, cfgLogger btclog.Logger,
 		rfq.ManagerCfg{
 			PeerMessenger:   msgTransportClient,
 			HtlcInterceptor: lndRouterClient,
+			HtlcSubscriber:  lndRouterClient,
 			PriceOracle:     priceOracle,
 			ChannelLister:   walletAnchor,
 			AliasManager:    lndRouterClient,