multi: replace NotifyExitHopHtlc eob param with hop.Payload

contractcourt/interfaces.go

@@ -21,7 +21,7 @@ type Registry interface {
 	NotifyExitHopHtlc(payHash lntypes.Hash, paidAmount lnwire.MilliSatoshi,
 		expiry uint32, currentHeight int32,
 		circuitKey channeldb.CircuitKey, hodlChan chan<- interface{},
-		eob []byte) (*invoices.HodlEvent, error)
+		payload invoices.Payload) (*invoices.HodlEvent, error)
 
 	// HodlUnsubscribeAll unsubscribes from all hodl events.
 	HodlUnsubscribeAll(subscriber chan<- interface{})

contractcourt/mock_registry_test.go

@@ -24,7 +24,7 @@ type mockRegistry struct {
 func (r *mockRegistry) NotifyExitHopHtlc(payHash lntypes.Hash,
 	paidAmount lnwire.MilliSatoshi, expiry uint32, currentHeight int32,
 	circuitKey channeldb.CircuitKey, hodlChan chan<- interface{},
-	eob []byte) (*invoices.HodlEvent, error) {
+	payload invoices.Payload) (*invoices.HodlEvent, error) {
 
 	r.notifyChan <- notifyExitHopData{
 		hodlChan:      hodlChan,

htlcswitch/hop/payload.go

@@ -233,3 +233,9 @@ func ValidateParsedPayloadTypes(parsedTypes tlv.TypeSet,
 
 	return nil
 }
+
+// MultiPath returns the record corresponding the option_mpp parsed from the
+// onion payload.
+func (h *Payload) MultiPath() *record.MPP {
+	return h.MPP
+}

htlcswitch/interfaces.go

@@ -27,7 +27,7 @@ type InvoiceDatabase interface {
 	NotifyExitHopHtlc(payHash lntypes.Hash, paidAmount lnwire.MilliSatoshi,
 		expiry uint32, currentHeight int32,
 		circuitKey channeldb.CircuitKey, hodlChan chan<- interface{},
-		eob []byte) (*invoices.HodlEvent, error)
+		payload invoices.Payload) (*invoices.HodlEvent, error)
 
 	// CancelInvoice attempts to cancel the invoice corresponding to the
 	// passed payment hash.

htlcswitch/link.go

@@ -2676,8 +2676,7 @@ func (l *channelLink) processRemoteAdds(fwdPkg *channeldb.FwdPkg,
 		switch fwdInfo.NextHop {
 		case hop.Exit:
 			updated, err := l.processExitHop(
-				pd, obfuscator, fwdInfo, heightNow,
-				chanIterator.ExtraOnionBlob(),
+				pd, obfuscator, fwdInfo, heightNow, pld,
 			)
 			if err != nil {
 				l.fail(LinkFailureError{code: ErrInternalError},
@@ -2846,7 +2845,7 @@ func (l *channelLink) processRemoteAdds(fwdPkg *channeldb.FwdPkg,
 // returns a boolean indicating whether the commitment tx needs an update.
 func (l *channelLink) processExitHop(pd *lnwallet.PaymentDescriptor,
 	obfuscator hop.ErrorEncrypter, fwdInfo hop.ForwardingInfo,
-	heightNow uint32, eob []byte) (bool, error) {
+	heightNow uint32, payload invoices.Payload) (bool, error) {
 
 	// If hodl.ExitSettle is requested, we will not validate the final hop's
 	// ADD, nor will we settle the corresponding invoice or respond with the
@@ -2897,7 +2896,7 @@ func (l *channelLink) processExitHop(pd *lnwallet.PaymentDescriptor,
 
 	event, err := l.cfg.Registry.NotifyExitHopHtlc(
 		invoiceHash, pd.Amount, pd.Timeout, int32(heightNow),
-		circuitKey, l.hodlQueue.ChanIn(), eob,
+		circuitKey, l.hodlQueue.ChanIn(), payload,
 	)
 
 	switch err {

htlcswitch/mock.go

@@ -814,10 +814,11 @@ func (i *mockInvoiceRegistry) SettleHodlInvoice(preimage lntypes.Preimage) error
 func (i *mockInvoiceRegistry) NotifyExitHopHtlc(rhash lntypes.Hash,
 	amt lnwire.MilliSatoshi, expiry uint32, currentHeight int32,
 	circuitKey channeldb.CircuitKey, hodlChan chan<- interface{},
-	eob []byte) (*invoices.HodlEvent, error) {
+	payload invoices.Payload) (*invoices.HodlEvent, error) {
 
 	event, err := i.registry.NotifyExitHopHtlc(
-		rhash, amt, expiry, currentHeight, circuitKey, hodlChan, eob,
+		rhash, amt, expiry, currentHeight, circuitKey, hodlChan,
+		payload,
 	)
 	if err != nil {
 		return nil, err

invoices/interface.go

@@ -0,0 +1,11 @@
+package invoices
+
+import "github.com/lightningnetwork/lnd/record"
+
+// Payload abstracts access to any additional fields provided in the final hop's
+// TLV onion payload.
+type Payload interface {
+	// MultiPath returns the record corresponding the option_mpp parsed from
+	// the onion payload.
+	MultiPath() *record.MPP
+}

invoices/invoiceregistry.go

@@ -429,7 +429,7 @@ func (i *InvoiceRegistry) LookupInvoice(rHash lntypes.Hash) (channeldb.Invoice,
 func (i *InvoiceRegistry) NotifyExitHopHtlc(rHash lntypes.Hash,
 	amtPaid lnwire.MilliSatoshi, expiry uint32, currentHeight int32,
 	circuitKey channeldb.CircuitKey, hodlChan chan<- interface{},
-	eob []byte) (*HodlEvent, error) {
+	payload Payload) (*HodlEvent, error) {
 
 	i.Lock()
 	defer i.Unlock()