loop: extend server protocol for routing plugin recommendations

This commits extends the server protocol with routing plugin
recommendations and routing result reporting.

loopdb/protocol_version.go

@@ -47,13 +47,17 @@ const (
 	// the server to perform a probe to test inbound liquidty.
 	ProtocolVersionProbe ProtocolVersion = 8
 
+	// The client may ask the server to use a custom routing helper plugin
+	// in order to enhance off-chain payments corresponding to a swap.
+	ProtocolVersionRoutingPlugin = 9
+
 	// ProtocolVersionUnrecorded is set for swaps were created before we
 	// started saving protocol version with swaps.
 	ProtocolVersionUnrecorded ProtocolVersion = math.MaxUint32
 
 	// CurrentRPCProtocolVersion defines the version of the RPC protocol
 	// that is currently supported by the loop client.
-	CurrentRPCProtocolVersion = looprpc.ProtocolVersion_PROBE
+	CurrentRPCProtocolVersion = looprpc.ProtocolVersion_ROUTING_PLUGIN
 
 	// CurrentInternalProtocolVersion defines the RPC current protocol in
 	// the internal representation.
@@ -95,6 +99,9 @@ func (p ProtocolVersion) String() string {
 	case ProtocolVersionProbe:
 		return "Probe"
 
+	case ProtocolVersionRoutingPlugin:
+		return "Routing Plugin"
+
 	default:
 		return "Unknown"
 	}

loopdb/protocol_version_test.go

@@ -23,6 +23,7 @@ func TestProtocolVersionSanity(t *testing.T) {
 		ProtocolVersionMultiLoopIn,
 		ProtocolVersionLoopOutCancel,
 		ProtocolVersionProbe,
+		ProtocolVersionRoutingPlugin,
 	}
 
 	rpcVersions := [...]looprpc.ProtocolVersion{
@@ -35,6 +36,7 @@ func TestProtocolVersionSanity(t *testing.T) {
 		looprpc.ProtocolVersion_MULTI_LOOP_IN,
 		looprpc.ProtocolVersion_LOOP_OUT_CANCEL,
 		looprpc.ProtocolVersion_PROBE,
+		looprpc.ProtocolVersion_ROUTING_PLUGIN,
 	}
 
 	require.Equal(t, len(versions), len(rpcVersions))

server_mock_test.go

@@ -242,3 +242,15 @@ func (s *serverMock) Probe(ctx context.Context, amt btcutil.Amount,
 
 	return nil
 }
+
+func (s *serverMock) RecommendRoutingPlugin(_ context.Context, _ lntypes.Hash) (
+	RoutingPluginType, error) {
+
+	return RoutingPluginNone, nil
+}
+
+func (s *serverMock) ReportRoutingResult(_ context.Context, _ lntypes.Hash,
+	_ RoutingPluginType, _ bool, _ int32, _ int64) error {
+
+	return nil
+}

swap_server_client.go

@@ -43,6 +43,30 @@ var (
 		"be provided")
 )
 
+// RoutingPluginType represents the routing plugin type directly.
+type RoutingPluginType uint8
+
+const (
+	// RoutingPluginNone is recommended when the client shouldn't use any
+	// routing plugin.
+	RoutingPluginNone RoutingPluginType = 0
+
+	// RoutingPluginLowHigh is recommended when the client should use
+	// low-high routing method.
+	RoutingPluginLowHigh RoutingPluginType = 1
+)
+
+// String pretty prints a RoutingPluginType.
+func (r RoutingPluginType) String() string {
+	switch r {
+	case RoutingPluginLowHigh:
+		return "Low/High"
+
+	default:
+		return "None"
+	}
+}
+
 type swapServerClient interface {
 	GetLoopOutTerms(ctx context.Context) (
 		*LoopOutTerms, error)
@@ -86,6 +110,17 @@ type swapServerClient interface {
 	// CancelLoopOutSwap cancels a loop out swap.
 	CancelLoopOutSwap(ctx context.Context,
 		details *outCancelDetails) error
+
+	// RecommendRoutingPlugin asks the server for routing plugin
+	// recommendation for off-chain payment(s) of a swap.
+	RecommendRoutingPlugin(ctx context.Context, swapHash lntypes.Hash,
+		paymentAddr [32]byte) (RoutingPluginType, error)
+
+	// ReportRoutingResult reports a routing result corresponding to a swap.
+	ReportRoutingResult(ctx context.Context,
+		swapHash lntypes.Hash, paymentAddr [32]byte,
+		plugin RoutingPluginType, success bool, attempts int32,
+		totalTime int64) error
 }
 
 type grpcSwapServerClient struct {
@@ -619,6 +654,72 @@ func (s *grpcSwapServerClient) CancelLoopOutSwap(ctx context.Context,
 	return err
 }
 
+// RecommendRoutingPlugin asks the server for routing plugin recommendation for
+// off-chain payment(s) of a swap.
+func (s *grpcSwapServerClient) RecommendRoutingPlugin(ctx context.Context,
+	swapHash lntypes.Hash, paymentAddr [32]byte) (RoutingPluginType, error) {
+
+	req := &looprpc.RecommendRoutingPluginReq{
+		ProtocolVersion: loopdb.CurrentRPCProtocolVersion,
+		SwapHash:        swapHash[:],
+		PaymentAddress:  paymentAddr[:],
+	}
+
+	rpcCtx, rpcCancel := context.WithTimeout(ctx, globalCallTimeout)
+	defer rpcCancel()
+
+	res, err := s.server.RecommendRoutingPlugin(rpcCtx, req)
+	if err != nil {
+		return RoutingPluginNone, err
+	}
+
+	var plugin RoutingPluginType
+	switch res.Plugin {
+	case looprpc.RoutingPlugin_NONE:
+		plugin = RoutingPluginNone
+
+	case looprpc.RoutingPlugin_LOW_HIGH:
+		plugin = RoutingPluginLowHigh
+
+	default:
+		log.Warnf("Recommended routing plugin is unknown: %v", plugin)
+		plugin = RoutingPluginNone
+	}
+
+	return plugin, nil
+}
+
+// ReportRoutingResult reports a routing result corresponding to a swap.
+func (s *grpcSwapServerClient) ReportRoutingResult(ctx context.Context,
+	swapHash lntypes.Hash, paymentAddr [32]byte, plugin RoutingPluginType,
+	success bool, attempts int32, totalTime int64) error {
+
+	var rpcRoutingPlugin looprpc.RoutingPlugin
+	switch plugin {
+	case RoutingPluginLowHigh:
+		rpcRoutingPlugin = looprpc.RoutingPlugin_LOW_HIGH
+
+	default:
+		rpcRoutingPlugin = looprpc.RoutingPlugin_NONE
+	}
+
+	req := &looprpc.ReportRoutingResultReq{
+		ProtocolVersion: loopdb.CurrentRPCProtocolVersion,
+		SwapHash:        swapHash[:],
+		PaymentAddress:  paymentAddr[:],
+		Plugin:          rpcRoutingPlugin,
+		Success:         success,
+		Attempts:        attempts,
+		TotalTime:       totalTime,
+	}
+
+	rpcCtx, rpcCancel := context.WithTimeout(ctx, globalCallTimeout)
+	defer rpcCancel()
+
+	_, err := s.server.ReportRoutingResult(rpcCtx, req)
+	return err
+}
+
 func rpcRouteCancel(details *outCancelDetails) (
 	*looprpc.CancelLoopOutSwapRequest_RouteCancel, error) {
 

swapserverrpc/server.pb.go

@@ -59,6 +59,9 @@ const (
 	// The client is able to ask the server to probe to test inbound
 	// liquidity.
 	ProtocolVersion_PROBE ProtocolVersion = 8
+	// The client may ask the server to use a custom routing helper plugin in
+	// order to enhance off-chain payments corresponding to a swap.
+	ProtocolVersion_ROUTING_PLUGIN ProtocolVersion = 9
 )
 
 // Enum value maps for ProtocolVersion.
@@ -73,6 +76,7 @@ var (
 		6: "MULTI_LOOP_IN",
 		7: "LOOP_OUT_CANCEL",
 		8: "PROBE",
+		9: "ROUTING_PLUGIN",
 	}
 	ProtocolVersion_value = map[string]int32{
 		"LEGACY":                 0,
@@ -84,6 +88,7 @@ var (
 		"MULTI_LOOP_IN":          6,
 		"LOOP_OUT_CANCEL":        7,
 		"PROBE":                  8,
+		"ROUTING_PLUGIN":         9,
 	}
 )
 
@@ -357,6 +362,54 @@ func (PaymentFailureReason) EnumDescriptor() ([]byte, []int) {
 	return file_server_proto_rawDescGZIP(), []int{3}
 }
 
+type RoutingPlugin int32
+
+const (
+	// Client won't use any plugins to help with payment routing.
+	RoutingPlugin_NONE RoutingPlugin = 0
+	// Client will try more expensive routes for off-chain payments.
+	RoutingPlugin_LOW_HIGH RoutingPlugin = 1
+)
+
+// Enum value maps for RoutingPlugin.
+var (
+	RoutingPlugin_name = map[int32]string{
+		0: "NONE",
+		1: "LOW_HIGH",
+	}
+	RoutingPlugin_value = map[string]int32{
+		"NONE":     0,
+		"LOW_HIGH": 1,
+	}
+)
+
+func (x RoutingPlugin) Enum() *RoutingPlugin {
+	p := new(RoutingPlugin)
+	*p = x
+	return p
+}
+
+func (x RoutingPlugin) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (RoutingPlugin) Descriptor() protoreflect.EnumDescriptor {
+	return file_server_proto_enumTypes[4].Descriptor()
+}
+
+func (RoutingPlugin) Type() protoreflect.EnumType {
+	return &file_server_proto_enumTypes[4]
+}
+
+func (x RoutingPlugin) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use RoutingPlugin.Descriptor instead.
+func (RoutingPlugin) EnumDescriptor() ([]byte, []int) {
+	return file_server_proto_rawDescGZIP(), []int{4}
+}
+
 type ServerLoopOutRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1947,6 +2000,260 @@ func (*ServerProbeResponse) Descriptor() ([]byte, []int) {
 	return file_server_proto_rawDescGZIP(), []int{22}
 }
 
+type RecommendRoutingPluginReq struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	ProtocolVersion ProtocolVersion `protobuf:"varint,1,opt,name=protocol_version,json=protocolVersion,proto3,enum=looprpc.ProtocolVersion" json:"protocol_version,omitempty"`
+	// The hash of the swap requesting a routing plugin.
+	SwapHash []byte `protobuf:"bytes,2,opt,name=swap_hash,json=swapHash,proto3" json:"swap_hash,omitempty"`
+	// The payment address for the swap invoice, used to ensure that only the
+	// swap owner can request routing plugin recommendation.
+	PaymentAddress []byte `protobuf:"bytes,3,opt,name=payment_address,json=paymentAddress,proto3" json:"payment_address,omitempty"`
+}
+
+func (x *RecommendRoutingPluginReq) Reset() {
+	*x = RecommendRoutingPluginReq{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_server_proto_msgTypes[23]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *RecommendRoutingPluginReq) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*RecommendRoutingPluginReq) ProtoMessage() {}
+
+func (x *RecommendRoutingPluginReq) ProtoReflect() protoreflect.Message {
+	mi := &file_server_proto_msgTypes[23]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use RecommendRoutingPluginReq.ProtoReflect.Descriptor instead.
+func (*RecommendRoutingPluginReq) Descriptor() ([]byte, []int) {
+	return file_server_proto_rawDescGZIP(), []int{23}
+}
+
+func (x *RecommendRoutingPluginReq) GetProtocolVersion() ProtocolVersion {
+	if x != nil {
+		return x.ProtocolVersion
+	}
+	return ProtocolVersion_LEGACY
+}
+
+func (x *RecommendRoutingPluginReq) GetSwapHash() []byte {
+	if x != nil {
+		return x.SwapHash
+	}
+	return nil
+}
+
+func (x *RecommendRoutingPluginReq) GetPaymentAddress() []byte {
+	if x != nil {
+		return x.PaymentAddress
+	}
+	return nil
+}
+
+type RecommendRoutingPluginRes struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The routing plugin to use for off-chain payments.
+	Plugin RoutingPlugin `protobuf:"varint,1,opt,name=plugin,proto3,enum=looprpc.RoutingPlugin" json:"plugin,omitempty"`
+}
+
+func (x *RecommendRoutingPluginRes) Reset() {
+	*x = RecommendRoutingPluginRes{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_server_proto_msgTypes[24]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *RecommendRoutingPluginRes) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*RecommendRoutingPluginRes) ProtoMessage() {}
+
+func (x *RecommendRoutingPluginRes) ProtoReflect() protoreflect.Message {
+	mi := &file_server_proto_msgTypes[24]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use RecommendRoutingPluginRes.ProtoReflect.Descriptor instead.
+func (*RecommendRoutingPluginRes) Descriptor() ([]byte, []int) {
+	return file_server_proto_rawDescGZIP(), []int{24}
+}
+
+func (x *RecommendRoutingPluginRes) GetPlugin() RoutingPlugin {
+	if x != nil {
+		return x.Plugin
+	}
+	return RoutingPlugin_NONE
+}
+
+type ReportRoutingResultReq struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	ProtocolVersion ProtocolVersion `protobuf:"varint,1,opt,name=protocol_version,json=protocolVersion,proto3,enum=looprpc.ProtocolVersion" json:"protocol_version,omitempty"`
+	// The swap hash.
+	SwapHash []byte `protobuf:"bytes,2,opt,name=swap_hash,json=swapHash,proto3" json:"swap_hash,omitempty"`
+	// The payment address for the swap invoice, used to ensure that only the
+	// swap owner can report routing result.
+	PaymentAddress []byte `protobuf:"bytes,3,opt,name=payment_address,json=paymentAddress,proto3" json:"payment_address,omitempty"`
+	// The routing plugin that was used.
+	Plugin RoutingPlugin `protobuf:"varint,4,opt,name=plugin,proto3,enum=looprpc.RoutingPlugin" json:"plugin,omitempty"`
+	// Whether this payment succeeded.
+	Success bool `protobuf:"varint,5,opt,name=success,proto3" json:"success,omitempty"`
+	// The number of payment attempts using the plugin.
+	Attempts int32 `protobuf:"varint,6,opt,name=attempts,proto3" json:"attempts,omitempty"`
+	// Total time used in milliseconds.
+	TotalTime int64 `protobuf:"varint,7,opt,name=total_time,json=totalTime,proto3" json:"total_time,omitempty"`
+}
+
+func (x *ReportRoutingResultReq) Reset() {
+	*x = ReportRoutingResultReq{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_server_proto_msgTypes[25]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ReportRoutingResultReq) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ReportRoutingResultReq) ProtoMessage() {}
+
+func (x *ReportRoutingResultReq) ProtoReflect() protoreflect.Message {
+	mi := &file_server_proto_msgTypes[25]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ReportRoutingResultReq.ProtoReflect.Descriptor instead.
+func (*ReportRoutingResultReq) Descriptor() ([]byte, []int) {
+	return file_server_proto_rawDescGZIP(), []int{25}
+}
+
+func (x *ReportRoutingResultReq) GetProtocolVersion() ProtocolVersion {
+	if x != nil {
+		return x.ProtocolVersion
+	}
+	return ProtocolVersion_LEGACY
+}
+
+func (x *ReportRoutingResultReq) GetSwapHash() []byte {
+	if x != nil {
+		return x.SwapHash
+	}
+	return nil
+}
+
+func (x *ReportRoutingResultReq) GetPaymentAddress() []byte {
+	if x != nil {
+		return x.PaymentAddress
+	}
+	return nil
+}
+
+func (x *ReportRoutingResultReq) GetPlugin() RoutingPlugin {
+	if x != nil {
+		return x.Plugin
+	}
+	return RoutingPlugin_NONE
+}
+
+func (x *ReportRoutingResultReq) GetSuccess() bool {
+	if x != nil {
+		return x.Success
+	}
+	return false
+}
+
+func (x *ReportRoutingResultReq) GetAttempts() int32 {
+	if x != nil {
+		return x.Attempts
+	}
+	return 0
+}
+
+func (x *ReportRoutingResultReq) GetTotalTime() int64 {
+	if x != nil {
+		return x.TotalTime
+	}
+	return 0
+}
+
+type ReportRoutingResultRes struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *ReportRoutingResultRes) Reset() {
+	*x = ReportRoutingResultRes{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_server_proto_msgTypes[26]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *ReportRoutingResultRes) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ReportRoutingResultRes) ProtoMessage() {}
+
+func (x *ReportRoutingResultRes) ProtoReflect() protoreflect.Message {
+	mi := &file_server_proto_msgTypes[26]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ReportRoutingResultRes.ProtoReflect.Descriptor instead.
+func (*ReportRoutingResultRes) Descriptor() ([]byte, []int) {
+	return file_server_proto_rawDescGZIP(), []int{26}
+}
+
 var File_server_proto protoreflect.FileDescriptor
 
 var file_server_proto_rawDesc = []byte{
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 }
 
 var (
@@ -2320,44 +2678,49 @@ func file_server_proto_rawDescGZIP() []byte {
 	return file_server_proto_rawDescData
 }
 
-var file_server_proto_enumTypes = make([]protoimpl.EnumInfo, 4)
-var file_server_proto_msgTypes = make([]protoimpl.MessageInfo, 23)
+var file_server_proto_enumTypes = make([]protoimpl.EnumInfo, 5)
+var file_server_proto_msgTypes = make([]protoimpl.MessageInfo, 27)
 var file_server_proto_goTypes = []interface{}{
 	(ProtocolVersion)(0),                      // 0: looprpc.ProtocolVersion
 	(ServerSwapState)(0),                      // 1: looprpc.ServerSwapState
 	(RoutePaymentType)(0),                     // 2: looprpc.RoutePaymentType
 	(PaymentFailureReason)(0),                 // 3: looprpc.PaymentFailureReason
-	(*ServerLoopOutRequest)(nil),              // 4: looprpc.ServerLoopOutRequest
-	(*ServerLoopOutResponse)(nil),             // 5: looprpc.ServerLoopOutResponse
-	(*ServerLoopOutQuoteRequest)(nil),         // 6: looprpc.ServerLoopOutQuoteRequest
-	(*ServerLoopOutQuote)(nil),                // 7: looprpc.ServerLoopOutQuote
-	(*ServerLoopOutTermsRequest)(nil),         // 8: looprpc.ServerLoopOutTermsRequest
-	(*ServerLoopOutTerms)(nil),                // 9: looprpc.ServerLoopOutTerms
-	(*ServerLoopInRequest)(nil),               // 10: looprpc.ServerLoopInRequest
-	(*ServerLoopInResponse)(nil),              // 11: looprpc.ServerLoopInResponse
-	(*ServerLoopInQuoteRequest)(nil),          // 12: looprpc.ServerLoopInQuoteRequest
-	(*ServerLoopInQuoteResponse)(nil),         // 13: looprpc.ServerLoopInQuoteResponse
-	(*ServerLoopInTermsRequest)(nil),          // 14: looprpc.ServerLoopInTermsRequest
-	(*ServerLoopInTerms)(nil),                 // 15: looprpc.ServerLoopInTerms
-	(*ServerLoopOutPushPreimageRequest)(nil),  // 16: looprpc.ServerLoopOutPushPreimageRequest
-	(*ServerLoopOutPushPreimageResponse)(nil), // 17: looprpc.ServerLoopOutPushPreimageResponse
-	(*SubscribeUpdatesRequest)(nil),           // 18: looprpc.SubscribeUpdatesRequest
-	(*SubscribeLoopOutUpdatesResponse)(nil),   // 19: looprpc.SubscribeLoopOutUpdatesResponse
-	(*SubscribeLoopInUpdatesResponse)(nil),    // 20: looprpc.SubscribeLoopInUpdatesResponse
-	(*RouteCancel)(nil),                       // 21: looprpc.RouteCancel
-	(*HtlcAttempt)(nil),                       // 22: looprpc.HtlcAttempt
-	(*CancelLoopOutSwapRequest)(nil),          // 23: looprpc.CancelLoopOutSwapRequest
-	(*CancelLoopOutSwapResponse)(nil),         // 24: looprpc.CancelLoopOutSwapResponse
-	(*ServerProbeRequest)(nil),                // 25: looprpc.ServerProbeRequest
-	(*ServerProbeResponse)(nil),               // 26: looprpc.ServerProbeResponse
-	(*RouteHint)(nil),                         // 27: looprpc.RouteHint
+	(RoutingPlugin)(0),                        // 4: looprpc.RoutingPlugin
+	(*ServerLoopOutRequest)(nil),              // 5: looprpc.ServerLoopOutRequest
+	(*ServerLoopOutResponse)(nil),             // 6: looprpc.ServerLoopOutResponse
+	(*ServerLoopOutQuoteRequest)(nil),         // 7: looprpc.ServerLoopOutQuoteRequest
+	(*ServerLoopOutQuote)(nil),                // 8: looprpc.ServerLoopOutQuote
+	(*ServerLoopOutTermsRequest)(nil),         // 9: looprpc.ServerLoopOutTermsRequest
+	(*ServerLoopOutTerms)(nil),                // 10: looprpc.ServerLoopOutTerms
+	(*ServerLoopInRequest)(nil),               // 11: looprpc.ServerLoopInRequest
+	(*ServerLoopInResponse)(nil),              // 12: looprpc.ServerLoopInResponse
+	(*ServerLoopInQuoteRequest)(nil),          // 13: looprpc.ServerLoopInQuoteRequest
+	(*ServerLoopInQuoteResponse)(nil),         // 14: looprpc.ServerLoopInQuoteResponse
+	(*ServerLoopInTermsRequest)(nil),          // 15: looprpc.ServerLoopInTermsRequest
+	(*ServerLoopInTerms)(nil),                 // 16: looprpc.ServerLoopInTerms
+	(*ServerLoopOutPushPreimageRequest)(nil),  // 17: looprpc.ServerLoopOutPushPreimageRequest
+	(*ServerLoopOutPushPreimageResponse)(nil), // 18: looprpc.ServerLoopOutPushPreimageResponse
+	(*SubscribeUpdatesRequest)(nil),           // 19: looprpc.SubscribeUpdatesRequest
+	(*SubscribeLoopOutUpdatesResponse)(nil),   // 20: looprpc.SubscribeLoopOutUpdatesResponse
+	(*SubscribeLoopInUpdatesResponse)(nil),    // 21: looprpc.SubscribeLoopInUpdatesResponse
+	(*RouteCancel)(nil),                       // 22: looprpc.RouteCancel
+	(*HtlcAttempt)(nil),                       // 23: looprpc.HtlcAttempt
+	(*CancelLoopOutSwapRequest)(nil),          // 24: looprpc.CancelLoopOutSwapRequest
+	(*CancelLoopOutSwapResponse)(nil),         // 25: looprpc.CancelLoopOutSwapResponse
+	(*ServerProbeRequest)(nil),                // 26: looprpc.ServerProbeRequest
+	(*ServerProbeResponse)(nil),               // 27: looprpc.ServerProbeResponse
+	(*RecommendRoutingPluginReq)(nil),         // 28: looprpc.RecommendRoutingPluginReq
+	(*RecommendRoutingPluginRes)(nil),         // 29: looprpc.RecommendRoutingPluginRes
+	(*ReportRoutingResultReq)(nil),            // 30: looprpc.ReportRoutingResultReq
+	(*ReportRoutingResultRes)(nil),            // 31: looprpc.ReportRoutingResultRes
+	(*RouteHint)(nil),                         // 32: looprpc.RouteHint
 }
 var file_server_proto_depIdxs = []int32{
 	0,  // 0: looprpc.ServerLoopOutRequest.protocol_version:type_name -> looprpc.ProtocolVersion
 	0,  // 1: looprpc.ServerLoopOutQuoteRequest.protocol_version:type_name -> looprpc.ProtocolVersion
 	0,  // 2: looprpc.ServerLoopOutTermsRequest.protocol_version:type_name -> looprpc.ProtocolVersion
 	0,  // 3: looprpc.ServerLoopInRequest.protocol_version:type_name -> looprpc.ProtocolVersion
-	27, // 4: looprpc.ServerLoopInQuoteRequest.route_hints:type_name -> looprpc.RouteHint
+	32, // 4: looprpc.ServerLoopInQuoteRequest.route_hints:type_name -> looprpc.RouteHint
 	0,  // 5: looprpc.ServerLoopInQuoteRequest.protocol_version:type_name -> looprpc.ProtocolVersion
 	0,  // 6: looprpc.ServerLoopInTermsRequest.protocol_version:type_name -> looprpc.ProtocolVersion
 	0,  // 7: looprpc.ServerLoopOutPushPreimageRequest.protocol_version:type_name -> looprpc.ProtocolVersion
@@ -2365,39 +2728,47 @@ var file_server_proto_depIdxs = []int32{
 	1,  // 9: looprpc.SubscribeLoopOutUpdatesResponse.state:type_name -> looprpc.ServerSwapState
 	1,  // 10: looprpc.SubscribeLoopInUpdatesResponse.state:type_name -> looprpc.ServerSwapState
 	2,  // 11: looprpc.RouteCancel.route_type:type_name -> looprpc.RoutePaymentType
-	22, // 12: looprpc.RouteCancel.attempts:type_name -> looprpc.HtlcAttempt
+	23, // 12: looprpc.RouteCancel.attempts:type_name -> looprpc.HtlcAttempt
 	3,  // 13: looprpc.RouteCancel.failure:type_name -> looprpc.PaymentFailureReason
 	0,  // 14: looprpc.CancelLoopOutSwapRequest.protocol_version:type_name -> looprpc.ProtocolVersion
-	21, // 15: looprpc.CancelLoopOutSwapRequest.route_cancel:type_name -> looprpc.RouteCancel
+	22, // 15: looprpc.CancelLoopOutSwapRequest.route_cancel:type_name -> looprpc.RouteCancel
 	0,  // 16: looprpc.ServerProbeRequest.protocol_version:type_name -> looprpc.ProtocolVersion
-	27, // 17: looprpc.ServerProbeRequest.route_hints:type_name -> looprpc.RouteHint
-	8,  // 18: looprpc.SwapServer.LoopOutTerms:input_type -> looprpc.ServerLoopOutTermsRequest
-	4,  // 19: looprpc.SwapServer.NewLoopOutSwap:input_type -> looprpc.ServerLoopOutRequest
-	16, // 20: looprpc.SwapServer.LoopOutPushPreimage:input_type -> looprpc.ServerLoopOutPushPreimageRequest
-	6,  // 21: looprpc.SwapServer.LoopOutQuote:input_type -> looprpc.ServerLoopOutQuoteRequest
-	14, // 22: looprpc.SwapServer.LoopInTerms:input_type -> looprpc.ServerLoopInTermsRequest
-	10, // 23: looprpc.SwapServer.NewLoopInSwap:input_type -> looprpc.ServerLoopInRequest
-	12, // 24: looprpc.SwapServer.LoopInQuote:input_type -> looprpc.ServerLoopInQuoteRequest
-	18, // 25: looprpc.SwapServer.SubscribeLoopOutUpdates:input_type -> looprpc.SubscribeUpdatesRequest
-	18, // 26: looprpc.SwapServer.SubscribeLoopInUpdates:input_type -> looprpc.SubscribeUpdatesRequest
-	23, // 27: looprpc.SwapServer.CancelLoopOutSwap:input_type -> looprpc.CancelLoopOutSwapRequest
-	25, // 28: looprpc.SwapServer.Probe:input_type -> looprpc.ServerProbeRequest
-	9,  // 29: looprpc.SwapServer.LoopOutTerms:output_type -> looprpc.ServerLoopOutTerms
-	5,  // 30: looprpc.SwapServer.NewLoopOutSwap:output_type -> looprpc.ServerLoopOutResponse
-	17, // 31: looprpc.SwapServer.LoopOutPushPreimage:output_type -> looprpc.ServerLoopOutPushPreimageResponse
-	7,  // 32: looprpc.SwapServer.LoopOutQuote:output_type -> looprpc.ServerLoopOutQuote
-	15, // 33: looprpc.SwapServer.LoopInTerms:output_type -> looprpc.ServerLoopInTerms
-	11, // 34: looprpc.SwapServer.NewLoopInSwap:output_type -> looprpc.ServerLoopInResponse
-	13, // 35: looprpc.SwapServer.LoopInQuote:output_type -> looprpc.ServerLoopInQuoteResponse
-	19, // 36: looprpc.SwapServer.SubscribeLoopOutUpdates:output_type -> looprpc.SubscribeLoopOutUpdatesResponse
-	20, // 37: looprpc.SwapServer.SubscribeLoopInUpdates:output_type -> looprpc.SubscribeLoopInUpdatesResponse
-	24, // 38: looprpc.SwapServer.CancelLoopOutSwap:output_type -> looprpc.CancelLoopOutSwapResponse
-	26, // 39: looprpc.SwapServer.Probe:output_type -> looprpc.ServerProbeResponse
-	29, // [29:40] is the sub-list for method output_type
-	18, // [18:29] is the sub-list for method input_type
-	18, // [18:18] is the sub-list for extension type_name
-	18, // [18:18] is the sub-list for extension extendee
-	0,  // [0:18] is the sub-list for field type_name
+	32, // 17: looprpc.ServerProbeRequest.route_hints:type_name -> looprpc.RouteHint
+	0,  // 18: looprpc.RecommendRoutingPluginReq.protocol_version:type_name -> looprpc.ProtocolVersion
+	4,  // 19: looprpc.RecommendRoutingPluginRes.plugin:type_name -> looprpc.RoutingPlugin
+	0,  // 20: looprpc.ReportRoutingResultReq.protocol_version:type_name -> looprpc.ProtocolVersion
+	4,  // 21: looprpc.ReportRoutingResultReq.plugin:type_name -> looprpc.RoutingPlugin
+	9,  // 22: looprpc.SwapServer.LoopOutTerms:input_type -> looprpc.ServerLoopOutTermsRequest
+	5,  // 23: looprpc.SwapServer.NewLoopOutSwap:input_type -> looprpc.ServerLoopOutRequest
+	17, // 24: looprpc.SwapServer.LoopOutPushPreimage:input_type -> looprpc.ServerLoopOutPushPreimageRequest
+	7,  // 25: looprpc.SwapServer.LoopOutQuote:input_type -> looprpc.ServerLoopOutQuoteRequest
+	15, // 26: looprpc.SwapServer.LoopInTerms:input_type -> looprpc.ServerLoopInTermsRequest
+	11, // 27: looprpc.SwapServer.NewLoopInSwap:input_type -> looprpc.ServerLoopInRequest
+	13, // 28: looprpc.SwapServer.LoopInQuote:input_type -> looprpc.ServerLoopInQuoteRequest
+	19, // 29: looprpc.SwapServer.SubscribeLoopOutUpdates:input_type -> looprpc.SubscribeUpdatesRequest
+	19, // 30: looprpc.SwapServer.SubscribeLoopInUpdates:input_type -> looprpc.SubscribeUpdatesRequest
+	24, // 31: looprpc.SwapServer.CancelLoopOutSwap:input_type -> looprpc.CancelLoopOutSwapRequest
+	26, // 32: looprpc.SwapServer.Probe:input_type -> looprpc.ServerProbeRequest
+	28, // 33: looprpc.SwapServer.RecommendRoutingPlugin:input_type -> looprpc.RecommendRoutingPluginReq
+	30, // 34: looprpc.SwapServer.ReportRoutingResult:input_type -> looprpc.ReportRoutingResultReq
+	10, // 35: looprpc.SwapServer.LoopOutTerms:output_type -> looprpc.ServerLoopOutTerms
+	6,  // 36: looprpc.SwapServer.NewLoopOutSwap:output_type -> looprpc.ServerLoopOutResponse
+	18, // 37: looprpc.SwapServer.LoopOutPushPreimage:output_type -> looprpc.ServerLoopOutPushPreimageResponse
+	8,  // 38: looprpc.SwapServer.LoopOutQuote:output_type -> looprpc.ServerLoopOutQuote
+	16, // 39: looprpc.SwapServer.LoopInTerms:output_type -> looprpc.ServerLoopInTerms
+	12, // 40: looprpc.SwapServer.NewLoopInSwap:output_type -> looprpc.ServerLoopInResponse
+	14, // 41: looprpc.SwapServer.LoopInQuote:output_type -> looprpc.ServerLoopInQuoteResponse
+	20, // 42: looprpc.SwapServer.SubscribeLoopOutUpdates:output_type -> looprpc.SubscribeLoopOutUpdatesResponse
+	21, // 43: looprpc.SwapServer.SubscribeLoopInUpdates:output_type -> looprpc.SubscribeLoopInUpdatesResponse
+	25, // 44: looprpc.SwapServer.CancelLoopOutSwap:output_type -> looprpc.CancelLoopOutSwapResponse
+	27, // 45: looprpc.SwapServer.Probe:output_type -> looprpc.ServerProbeResponse
+	29, // 46: looprpc.SwapServer.RecommendRoutingPlugin:output_type -> looprpc.RecommendRoutingPluginRes
+	31, // 47: looprpc.SwapServer.ReportRoutingResult:output_type -> looprpc.ReportRoutingResultRes
+	35, // [35:48] is the sub-list for method output_type
+	22, // [22:35] is the sub-list for method input_type
+	22, // [22:22] is the sub-list for extension type_name
+	22, // [22:22] is the sub-list for extension extendee
+	0,  // [0:22] is the sub-list for field type_name
 }
 
 func init() { file_server_proto_init() }
@@ -2683,6 +3054,54 @@ func file_server_proto_init() {
 				return nil
 			}
 		}
+		file_server_proto_msgTypes[23].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*RecommendRoutingPluginReq); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_server_proto_msgTypes[24].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*RecommendRoutingPluginRes); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_server_proto_msgTypes[25].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ReportRoutingResultReq); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_server_proto_msgTypes[26].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ReportRoutingResultRes); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
 	}
 	file_server_proto_msgTypes[19].OneofWrappers = []interface{}{
 		(*CancelLoopOutSwapRequest_RouteCancel)(nil),
@@ -2692,8 +3111,8 @@ func file_server_proto_init() {
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_server_proto_rawDesc,
-			NumEnums:      4,
-			NumMessages:   23,
+			NumEnums:      5,
+			NumMessages:   27,
 			NumExtensions: 0,
 			NumServices:   1,
 		},

swapserverrpc/server.proto

@@ -37,6 +37,12 @@ service SwapServer {
         returns (CancelLoopOutSwapResponse);
 
     rpc Probe (ServerProbeRequest) returns (ServerProbeResponse);
+
+    rpc RecommendRoutingPlugin (RecommendRoutingPluginReq)
+        returns (RecommendRoutingPluginRes);
+
+    rpc ReportRoutingResult (ReportRoutingResultReq)
+        returns (ReportRoutingResultRes);
 }
 
 /**
@@ -82,6 +88,10 @@ enum ProtocolVersion {
     // The client is able to ask the server to probe to test inbound
     // liquidity.
     PROBE = 8;
+
+    // The client may ask the server to use a custom routing helper plugin in
+    // order to enhance off-chain payments corresponding to a swap.
+    ROUTING_PLUGIN = 9;
 }
 
 message ServerLoopOutRequest {
@@ -458,3 +468,53 @@ message ServerProbeRequest {
 
 message ServerProbeResponse {
 }
+
+message RecommendRoutingPluginReq {
+    ProtocolVersion protocol_version = 1;
+
+    // The hash of the swap requesting a routing plugin.
+    bytes swap_hash = 2;
+
+    // The payment address for the swap invoice, used to ensure that only the
+    // swap owner can request routing plugin recommendation.
+    bytes payment_address = 3;
+}
+
+enum RoutingPlugin {
+    // Client won't use any plugins to help with payment routing.
+    NONE = 0;
+
+    // Client will try more expensive routes for off-chain payments.
+    LOW_HIGH = 1;
+}
+
+message RecommendRoutingPluginRes {
+    // The routing plugin to use for off-chain payments.
+    RoutingPlugin plugin = 1;
+}
+
+message ReportRoutingResultReq {
+    ProtocolVersion protocol_version = 1;
+
+    // The swap hash.
+    bytes swap_hash = 2;
+
+    // The payment address for the swap invoice, used to ensure that only the
+    // swap owner can report routing result.
+    bytes payment_address = 3;
+
+    // The routing plugin that was used.
+    RoutingPlugin plugin = 4;
+
+    // Whether this payment succeeded.
+    bool success = 5;
+
+    // The number of payment attempts using the plugin.
+    int32 attempts = 6;
+
+    // Total time used in milliseconds.
+    int64 total_time = 7;
+}
+
+message ReportRoutingResultRes {
+}

swapserverrpc/server_grpc.pb.go

@@ -29,6 +29,8 @@ type SwapServerClient interface {
 	SubscribeLoopInUpdates(ctx context.Context, in *SubscribeUpdatesRequest, opts ...grpc.CallOption) (SwapServer_SubscribeLoopInUpdatesClient, error)
 	CancelLoopOutSwap(ctx context.Context, in *CancelLoopOutSwapRequest, opts ...grpc.CallOption) (*CancelLoopOutSwapResponse, error)
 	Probe(ctx context.Context, in *ServerProbeRequest, opts ...grpc.CallOption) (*ServerProbeResponse, error)
+	RecommendRoutingPlugin(ctx context.Context, in *RecommendRoutingPluginReq, opts ...grpc.CallOption) (*RecommendRoutingPluginRes, error)
+	ReportRoutingResult(ctx context.Context, in *ReportRoutingResultReq, opts ...grpc.CallOption) (*ReportRoutingResultRes, error)
 }
 
 type swapServerClient struct {
@@ -184,6 +186,24 @@ func (c *swapServerClient) Probe(ctx context.Context, in *ServerProbeRequest, op
 	return out, nil
 }
 
+func (c *swapServerClient) RecommendRoutingPlugin(ctx context.Context, in *RecommendRoutingPluginReq, opts ...grpc.CallOption) (*RecommendRoutingPluginRes, error) {
+	out := new(RecommendRoutingPluginRes)
+	err := c.cc.Invoke(ctx, "/looprpc.SwapServer/RecommendRoutingPlugin", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *swapServerClient) ReportRoutingResult(ctx context.Context, in *ReportRoutingResultReq, opts ...grpc.CallOption) (*ReportRoutingResultRes, error) {
+	out := new(ReportRoutingResultRes)
+	err := c.cc.Invoke(ctx, "/looprpc.SwapServer/ReportRoutingResult", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // SwapServerServer is the server API for SwapServer service.
 // All implementations must embed UnimplementedSwapServerServer
 // for forward compatibility
@@ -199,6 +219,8 @@ type SwapServerServer interface {
 	SubscribeLoopInUpdates(*SubscribeUpdatesRequest, SwapServer_SubscribeLoopInUpdatesServer) error
 	CancelLoopOutSwap(context.Context, *CancelLoopOutSwapRequest) (*CancelLoopOutSwapResponse, error)
 	Probe(context.Context, *ServerProbeRequest) (*ServerProbeResponse, error)
+	RecommendRoutingPlugin(context.Context, *RecommendRoutingPluginReq) (*RecommendRoutingPluginRes, error)
+	ReportRoutingResult(context.Context, *ReportRoutingResultReq) (*ReportRoutingResultRes, error)
 	mustEmbedUnimplementedSwapServerServer()
 }
 
@@ -239,6 +261,12 @@ func (UnimplementedSwapServerServer) CancelLoopOutSwap(context.Context, *CancelL
 func (UnimplementedSwapServerServer) Probe(context.Context, *ServerProbeRequest) (*ServerProbeResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method Probe not implemented")
 }
+func (UnimplementedSwapServerServer) RecommendRoutingPlugin(context.Context, *RecommendRoutingPluginReq) (*RecommendRoutingPluginRes, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method RecommendRoutingPlugin not implemented")
+}
+func (UnimplementedSwapServerServer) ReportRoutingResult(context.Context, *ReportRoutingResultReq) (*ReportRoutingResultRes, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method ReportRoutingResult not implemented")
+}
 func (UnimplementedSwapServerServer) mustEmbedUnimplementedSwapServerServer() {}
 
 // UnsafeSwapServerServer may be embedded to opt out of forward compatibility for this service.
@@ -456,6 +484,42 @@ func _SwapServer_Probe_Handler(srv interface{}, ctx context.Context, dec func(in
 	return interceptor(ctx, in, info, handler)
 }
 
+func _SwapServer_RecommendRoutingPlugin_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(RecommendRoutingPluginReq)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(SwapServerServer).RecommendRoutingPlugin(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/looprpc.SwapServer/RecommendRoutingPlugin",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(SwapServerServer).RecommendRoutingPlugin(ctx, req.(*RecommendRoutingPluginReq))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _SwapServer_ReportRoutingResult_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ReportRoutingResultReq)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(SwapServerServer).ReportRoutingResult(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/looprpc.SwapServer/ReportRoutingResult",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(SwapServerServer).ReportRoutingResult(ctx, req.(*ReportRoutingResultReq))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 // SwapServer_ServiceDesc is the grpc.ServiceDesc for SwapServer service.
 // It's only intended for direct use with grpc.RegisterService,
 // and not to be introspected or modified (even as a copy)
@@ -499,6 +563,14 @@ var SwapServer_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "Probe",
 			Handler:    _SwapServer_Probe_Handler,
 		},
+		{
+			MethodName: "RecommendRoutingPlugin",
+			Handler:    _SwapServer_RecommendRoutingPlugin_Handler,
+		},
+		{
+			MethodName: "ReportRoutingResult",
+			Handler:    _SwapServer_ReportRoutingResult_Handler,
+		},
 	},
 	Streams: []grpc.StreamDesc{
 		{