rpc: implement RPC htlc interceptor.

In this commit we add the ability to intercept forwarded htlc packets
straight from the RPC layer. The RPC layer handles a bidrectional stream
that comminucates to the client the intercepted packets and handles its
response by coordinating with the interceptable switch.
This commit is contained in:
Roei Erez committed 2020-06-18 15:20:07 +03:00
1 parent 0f50d8b2ed
commit 7b56268f70
11 files changed
+1224 -154

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+2
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@@ -211,6 +211,8 @@ http:
# deprecated, no REST endpoint
- selector: routerrpc.Router.TrackPayment
# deprecated, no REST endpoint
- selector: routerrpc.HtlcInterceptor
# request streaming RPC, REST not supported
# signrpc/signer.proto
- selector: signrpc.Signer.SignOutputRaw
+217
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@@ -0,0 +1,217 @@
package routerrpc
import (
"errors"
"fmt"
"sync"
"github.com/lightningnetwork/lnd/channeldb"
"github.com/lightningnetwork/lnd/htlcswitch"
"github.com/lightningnetwork/lnd/lntypes"
"github.com/lightningnetwork/lnd/lnwire"
)
var (
// ErrFwdNotExists is an error returned when the caller tries to resolve
// a forward that doesn't exist anymore.
ErrFwdNotExists = errors.New("forward does not exist")
// ErrMissingPreimage is an error returned when the caller tries to settle
// a forward and doesn't provide a preimage.
ErrMissingPreimage = errors.New("missing preimage")
)
// forwardInterceptor is a helper struct that handles the lifecycle of an rpc
// interceptor streaming session.
// It is created when the stream opens and disconnects when the stream closes.
type forwardInterceptor struct {
// server is the Server reference
server *Server
// holdForwards is a map of current hold forwards and their corresponding
// ForwardResolver.
holdForwards map[channeldb.CircuitKey]htlcswitch.InterceptedForward
// stream is the bidirectional RPC stream
stream Router_HtlcInterceptorServer
// quit is a channel that is closed when this forwardInterceptor is shutting
// down.
quit chan struct{}
// intercepted is where we stream all intercepted packets coming from
// the switch.
intercepted chan htlcswitch.InterceptedForward
wg sync.WaitGroup
}
// newForwardInterceptor creates a new forwardInterceptor.
func newForwardInterceptor(server *Server, stream Router_HtlcInterceptorServer) *forwardInterceptor {
return &forwardInterceptor{
server: server,
stream: stream,
holdForwards: make(
map[channeldb.CircuitKey]htlcswitch.InterceptedForward),
quit: make(chan struct{}),
intercepted: make(chan htlcswitch.InterceptedForward),
}
}
// run sends the intercepted packets to the client and receives the
// corersponding responses. On one hand it regsitered itself as an interceptor
// that receives the switch packets and on the other hand launches a go routine
// to read from the client stream.
// To coordinate all this and make sure it is safe for concurrent access all
// packets are sent to the main where they are handled.
func (r *forwardInterceptor) run() error {
// make sure we disconnect and resolves all remaining packets if any.
defer r.onDisconnect()
// Register our interceptor so we receive all forwarded packets.
interceptableForwarder := r.server.cfg.RouterBackend.InterceptableForwarder
interceptableForwarder.SetInterceptor(r.onIntercept)
defer interceptableForwarder.SetInterceptor(nil)
// start a go routine that reads client resolutions.
errChan := make(chan error)
resolutionRequests := make(chan *ForwardHtlcInterceptResponse)
r.wg.Add(1)
go r.readClientResponses(resolutionRequests, errChan)
// run the main loop that synchronizes both sides input into one go routine.
for {
select {
case intercepted := <-r.intercepted:
log.Tracef("sending intercepted packet to client %v", intercepted)
// in case we couldn't forward we exit the loop and drain the
// current interceptor as this indicates on a connection problem.
if err := r.holdAndForwardToClient(intercepted); err != nil {
return err
}
case resolution := <-resolutionRequests:
log.Tracef("resolving intercepted packet %v", resolution)
// in case we couldn't resolve we just add a log line since this
// does not indicate on any connection problem.
if err := r.resolveFromClient(resolution); err != nil {
log.Warnf("client resolution of intercepted "+
"packet failed %v", err)
}
case err := <-errChan:
return err
case <-r.server.quit:
return nil
}
}
}
// onIntercept is the function that is called by the switch for every forwarded
// packet. Our interceptor makes sure we hold the packet and then signal to the
// main loop to handle the packet. We only return true if we were able
// to deliver the packet to the main loop.
func (r *forwardInterceptor) onIntercept(p htlcswitch.InterceptedForward) bool {
select {
case r.intercepted <- p:
return true
case <-r.quit:
return false
case <-r.server.quit:
return false
}
}
func (r *forwardInterceptor) readClientResponses(
resolutionChan chan *ForwardHtlcInterceptResponse, errChan chan error) {
defer r.wg.Done()
for {
resp, err := r.stream.Recv()
if err != nil {
errChan <- err
return
}
// Now that we have the response from the RPC client, send it to
// the responses chan.
select {
case resolutionChan <- resp:
case <-r.quit:
return
case <-r.server.quit:
return
}
}
}
// holdAndForwardToClient forwards the intercepted htlc to the client.
func (r *forwardInterceptor) holdAndForwardToClient(
forward htlcswitch.InterceptedForward) error {
htlc := forward.Packet()
inKey := forward.CircuitKey()
// First hold the forward, then send to client.
r.holdForwards[forward.CircuitKey()] = forward
interceptionRequest := &ForwardHtlcInterceptRequest{
IncomingCircuitKey: &CircuitKey{
ChanId: inKey.ChanID.ToUint64(),
HtlcId: inKey.HtlcID,
},
HtlcPaymentHash: htlc.PaymentHash[:],
AmountMsat: uint64(htlc.Amount),
Expiry: htlc.Expiry,
}
return r.stream.Send(interceptionRequest)
}
// resolveFromClient handles a resolution arrived from the client.
func (r *forwardInterceptor) resolveFromClient(
in *ForwardHtlcInterceptResponse) error {
circuitKey := channeldb.CircuitKey{
ChanID: lnwire.NewShortChanIDFromInt(in.IncomingCircuitKey.ChanId),
HtlcID: in.IncomingCircuitKey.HtlcId,
}
var interceptedForward htlcswitch.InterceptedForward
interceptedForward, ok := r.holdForwards[circuitKey]
if !ok {
return ErrFwdNotExists
}
delete(r.holdForwards, circuitKey)
switch in.Action {
case ResolveHoldForwardAction_RESUME:
return interceptedForward.Resume()
case ResolveHoldForwardAction_FAIL:
return interceptedForward.Fail()
case ResolveHoldForwardAction_SETTLE:
if in.Preimage == nil {
return ErrMissingPreimage
}
preimage, err := lntypes.MakePreimage(in.Preimage)
if err != nil {
return err
}
return interceptedForward.Settle(preimage)
default:
return fmt.Errorf("unrecognized resolve action %v", in.Action)
}
}
// onDisconnect removes all previousely held forwards from
// the store. Before they are removed it ensure to resume as the default
// behavior.
func (r *forwardInterceptor) onDisconnect() {
// Then close the channel so all go routine will exit.
close(r.quit)
log.Infof("RPC interceptor disconnected, resolving held packets")
for key, forward := range r.holdForwards {
if err := forward.Resume(); err != nil {
log.Errorf("failed to resume hold forward %v", err)
}
delete(r.holdForwards, key)
}
r.wg.Wait()
}
+456 -144
View File
@@ -169,6 +169,34 @@ func (PaymentState) EnumDescriptor() ([]byte, []int) {
return fileDescriptor_7a0613f69d37b0a5, []int{1}
}
type ResolveHoldForwardAction int32
const (
ResolveHoldForwardAction_SETTLE ResolveHoldForwardAction = 0
ResolveHoldForwardAction_FAIL ResolveHoldForwardAction = 1
ResolveHoldForwardAction_RESUME ResolveHoldForwardAction = 2
)
var ResolveHoldForwardAction_name = map[int32]string{
0: "SETTLE",
1: "FAIL",
2: "RESUME",
}
var ResolveHoldForwardAction_value = map[string]int32{
"SETTLE": 0,
"FAIL": 1,
"RESUME": 2,
}
func (x ResolveHoldForwardAction) String() string {
return proto.EnumName(ResolveHoldForwardAction_name, int32(x))
}
func (ResolveHoldForwardAction) EnumDescriptor() ([]byte, []int) {
return fileDescriptor_7a0613f69d37b0a5, []int{2}
}
type HtlcEvent_EventType int32
const (
@@ -1727,9 +1755,196 @@ func (m *PaymentStatus) GetHtlcs() []*lnrpc.HTLCAttempt {
return nil
}
type CircuitKey struct {
/// The id of the channel that the is part of this circuit.
ChanId uint64 `protobuf:"varint,1,opt,name=chan_id,json=chanId,proto3" json:"chan_id,omitempty"`
/// The index of the incoming htlc in the incoming channel.
HtlcId uint64 `protobuf:"varint,2,opt,name=htlc_id,json=htlcId,proto3" json:"htlc_id,omitempty"`
XXX_NoUnkeyedLiteral struct{} `json:"-"`
XXX_unrecognized []byte `json:"-"`
XXX_sizecache int32 `json:"-"`
}
func (m *CircuitKey) Reset() { *m = CircuitKey{} }
func (m *CircuitKey) String() string { return proto.CompactTextString(m) }
func (*CircuitKey) ProtoMessage() {}
func (*CircuitKey) Descriptor() ([]byte, []int) {
return fileDescriptor_7a0613f69d37b0a5, []int{24}
}
func (m *CircuitKey) XXX_Unmarshal(b []byte) error {
return xxx_messageInfo_CircuitKey.Unmarshal(m, b)
}
func (m *CircuitKey) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
return xxx_messageInfo_CircuitKey.Marshal(b, m, deterministic)
}
func (m *CircuitKey) XXX_Merge(src proto.Message) {
xxx_messageInfo_CircuitKey.Merge(m, src)
}
func (m *CircuitKey) XXX_Size() int {
return xxx_messageInfo_CircuitKey.Size(m)
}
func (m *CircuitKey) XXX_DiscardUnknown() {
xxx_messageInfo_CircuitKey.DiscardUnknown(m)
}
var xxx_messageInfo_CircuitKey proto.InternalMessageInfo
func (m *CircuitKey) GetChanId() uint64 {
if m != nil {
return m.ChanId
}
return 0
}
func (m *CircuitKey) GetHtlcId() uint64 {
if m != nil {
return m.HtlcId
}
return 0
}
type ForwardHtlcInterceptRequest struct {
//
//The key of this forwarded htlc. It defines the incoming channel id and
//the index in this channel.
IncomingCircuitKey *CircuitKey `protobuf:"bytes,1,opt,name=incoming_circuit_key,json=incomingCircuitKey,proto3" json:"incoming_circuit_key,omitempty"`
//
//The htlc payment hash. This value is not guaranteed to be unique per
//request.
HtlcPaymentHash []byte `protobuf:"bytes,2,opt,name=htlc_payment_hash,json=htlcPaymentHash,proto3" json:"htlc_payment_hash,omitempty"`
/// The htlc amount.
AmountMsat uint64 `protobuf:"varint,3,opt,name=amount_msat,json=amountMsat,proto3" json:"amount_msat,omitempty"`
/// The htlc expiry.
Expiry uint32 `protobuf:"varint,4,opt,name=expiry,proto3" json:"expiry,omitempty"`
XXX_NoUnkeyedLiteral struct{} `json:"-"`
XXX_unrecognized []byte `json:"-"`
XXX_sizecache int32 `json:"-"`
}
func (m *ForwardHtlcInterceptRequest) Reset() { *m = ForwardHtlcInterceptRequest{} }
func (m *ForwardHtlcInterceptRequest) String() string { return proto.CompactTextString(m) }
func (*ForwardHtlcInterceptRequest) ProtoMessage() {}
func (*ForwardHtlcInterceptRequest) Descriptor() ([]byte, []int) {
return fileDescriptor_7a0613f69d37b0a5, []int{25}
}
func (m *ForwardHtlcInterceptRequest) XXX_Unmarshal(b []byte) error {
return xxx_messageInfo_ForwardHtlcInterceptRequest.Unmarshal(m, b)
}
func (m *ForwardHtlcInterceptRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
return xxx_messageInfo_ForwardHtlcInterceptRequest.Marshal(b, m, deterministic)
}
func (m *ForwardHtlcInterceptRequest) XXX_Merge(src proto.Message) {
xxx_messageInfo_ForwardHtlcInterceptRequest.Merge(m, src)
}
func (m *ForwardHtlcInterceptRequest) XXX_Size() int {
return xxx_messageInfo_ForwardHtlcInterceptRequest.Size(m)
}
func (m *ForwardHtlcInterceptRequest) XXX_DiscardUnknown() {
xxx_messageInfo_ForwardHtlcInterceptRequest.DiscardUnknown(m)
}
var xxx_messageInfo_ForwardHtlcInterceptRequest proto.InternalMessageInfo
func (m *ForwardHtlcInterceptRequest) GetIncomingCircuitKey() *CircuitKey {
if m != nil {
return m.IncomingCircuitKey
}
return nil
}
func (m *ForwardHtlcInterceptRequest) GetHtlcPaymentHash() []byte {
if m != nil {
return m.HtlcPaymentHash
}
return nil
}
func (m *ForwardHtlcInterceptRequest) GetAmountMsat() uint64 {
if m != nil {
return m.AmountMsat
}
return 0
}
func (m *ForwardHtlcInterceptRequest) GetExpiry() uint32 {
if m != nil {
return m.Expiry
}
return 0
}
//*
//ForwardHtlcInterceptResponse enables the caller to resolve a previously hold forward.
//The caller can choose either to:
//- `Resume`: Execute the default behavior (usually forward).
//- `Reject`: Fail the htlc backwards.
//- `Settle`: Settle this htlc with a given preimage.
type ForwardHtlcInterceptResponse struct {
//*
//The key of this forwarded htlc. It defines the incoming channel id and
//the index in this channel.
IncomingCircuitKey *CircuitKey `protobuf:"bytes,1,opt,name=incoming_circuit_key,json=incomingCircuitKey,proto3" json:"incoming_circuit_key,omitempty"`
// The resolve action for this intercepted htlc.
Action ResolveHoldForwardAction `protobuf:"varint,2,opt,name=action,proto3,enum=routerrpc.ResolveHoldForwardAction" json:"action,omitempty"`
// The preimage in case the resolve action is Settle.
Preimage []byte `protobuf:"bytes,3,opt,name=preimage,proto3" json:"preimage,omitempty"`
XXX_NoUnkeyedLiteral struct{} `json:"-"`
XXX_unrecognized []byte `json:"-"`
XXX_sizecache int32 `json:"-"`
}
func (m *ForwardHtlcInterceptResponse) Reset() { *m = ForwardHtlcInterceptResponse{} }
func (m *ForwardHtlcInterceptResponse) String() string { return proto.CompactTextString(m) }
func (*ForwardHtlcInterceptResponse) ProtoMessage() {}
func (*ForwardHtlcInterceptResponse) Descriptor() ([]byte, []int) {
return fileDescriptor_7a0613f69d37b0a5, []int{26}
}
func (m *ForwardHtlcInterceptResponse) XXX_Unmarshal(b []byte) error {
return xxx_messageInfo_ForwardHtlcInterceptResponse.Unmarshal(m, b)
}
func (m *ForwardHtlcInterceptResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
return xxx_messageInfo_ForwardHtlcInterceptResponse.Marshal(b, m, deterministic)
}
func (m *ForwardHtlcInterceptResponse) XXX_Merge(src proto.Message) {
xxx_messageInfo_ForwardHtlcInterceptResponse.Merge(m, src)
}
func (m *ForwardHtlcInterceptResponse) XXX_Size() int {
return xxx_messageInfo_ForwardHtlcInterceptResponse.Size(m)
}
func (m *ForwardHtlcInterceptResponse) XXX_DiscardUnknown() {
xxx_messageInfo_ForwardHtlcInterceptResponse.DiscardUnknown(m)
}
var xxx_messageInfo_ForwardHtlcInterceptResponse proto.InternalMessageInfo
func (m *ForwardHtlcInterceptResponse) GetIncomingCircuitKey() *CircuitKey {
if m != nil {
return m.IncomingCircuitKey
}
return nil
}
func (m *ForwardHtlcInterceptResponse) GetAction() ResolveHoldForwardAction {
if m != nil {
return m.Action
}
return ResolveHoldForwardAction_SETTLE
}
func (m *ForwardHtlcInterceptResponse) GetPreimage() []byte {
if m != nil {
return m.Preimage
}
return nil
}
func init() {
proto.RegisterEnum("routerrpc.FailureDetail", FailureDetail_name, FailureDetail_value)
proto.RegisterEnum("routerrpc.PaymentState", PaymentState_name, PaymentState_value)
proto.RegisterEnum("routerrpc.ResolveHoldForwardAction", ResolveHoldForwardAction_name, ResolveHoldForwardAction_value)
proto.RegisterEnum("routerrpc.HtlcEvent_EventType", HtlcEvent_EventType_name, HtlcEvent_EventType_value)
proto.RegisterType((*SendPaymentRequest)(nil), "routerrpc.SendPaymentRequest")
proto.RegisterMapType((map[uint64][]byte)(nil), "routerrpc.SendPaymentRequest.DestCustomRecordsEntry")
@@ -1756,155 +1971,172 @@ func init() {
proto.RegisterType((*SettleEvent)(nil), "routerrpc.SettleEvent")
proto.RegisterType((*LinkFailEvent)(nil), "routerrpc.LinkFailEvent")
proto.RegisterType((*PaymentStatus)(nil), "routerrpc.PaymentStatus")
proto.RegisterType((*CircuitKey)(nil), "routerrpc.CircuitKey")
proto.RegisterType((*ForwardHtlcInterceptRequest)(nil), "routerrpc.ForwardHtlcInterceptRequest")
proto.RegisterType((*ForwardHtlcInterceptResponse)(nil), "routerrpc.ForwardHtlcInterceptResponse")
}
func init() { proto.RegisterFile("routerrpc/router.proto", fileDescriptor_7a0613f69d37b0a5) }
var fileDescriptor_7a0613f69d37b0a5 = []byte{
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}
// Reference imports to suppress errors if they are not otherwise used.
@@ -1975,6 +2207,13 @@ type RouterClient interface {
//Deprecated, use TrackPaymentV2. TrackPayment returns an update stream for
//the payment identified by the payment hash.
TrackPayment(ctx context.Context, in *TrackPaymentRequest, opts ...grpc.CallOption) (Router_TrackPaymentClient, error)
//*
//HtlcInterceptor dispatches a bi-directional streaming RPC in which
//Forwarded HTLC requests are sent to the client and the client responds with
//a boolean that tells LND if this htlc should be intercepted.
//In case of interception, the htlc can be either settled, cancelled or
//resumed later by using the ResolveHoldForward endpoint.
HtlcInterceptor(ctx context.Context, opts ...grpc.CallOption) (Router_HtlcInterceptorClient, error)
}
type routerClient struct {
@@ -2211,6 +2450,37 @@ func (x *routerTrackPaymentClient) Recv() (*PaymentStatus, error) {
return m, nil
}
func (c *routerClient) HtlcInterceptor(ctx context.Context, opts ...grpc.CallOption) (Router_HtlcInterceptorClient, error) {
stream, err := c.cc.NewStream(ctx, &_Router_serviceDesc.Streams[5], "/routerrpc.Router/HtlcInterceptor", opts...)
if err != nil {
return nil, err
}
x := &routerHtlcInterceptorClient{stream}
return x, nil
}
type Router_HtlcInterceptorClient interface {
Send(*ForwardHtlcInterceptResponse) error
Recv() (*ForwardHtlcInterceptRequest, error)
grpc.ClientStream
}
type routerHtlcInterceptorClient struct {
grpc.ClientStream
}
func (x *routerHtlcInterceptorClient) Send(m *ForwardHtlcInterceptResponse) error {
return x.ClientStream.SendMsg(m)
}
func (x *routerHtlcInterceptorClient) Recv() (*ForwardHtlcInterceptRequest, error) {
m := new(ForwardHtlcInterceptRequest)
if err := x.ClientStream.RecvMsg(m); err != nil {
return nil, err
}
return m, nil
}
// RouterServer is the server API for Router service.
type RouterServer interface {
//
@@ -2269,6 +2539,13 @@ type RouterServer interface {
//Deprecated, use TrackPaymentV2. TrackPayment returns an update stream for
//the payment identified by the payment hash.
TrackPayment(*TrackPaymentRequest, Router_TrackPaymentServer) error
//*
//HtlcInterceptor dispatches a bi-directional streaming RPC in which
//Forwarded HTLC requests are sent to the client and the client responds with
//a boolean that tells LND if this htlc should be intercepted.
//In case of interception, the htlc can be either settled, cancelled or
//resumed later by using the ResolveHoldForward endpoint.
HtlcInterceptor(Router_HtlcInterceptorServer) error
}
// UnimplementedRouterServer can be embedded to have forward compatible implementations.
@@ -2311,6 +2588,9 @@ func (*UnimplementedRouterServer) SendPayment(req *SendPaymentRequest, srv Route
func (*UnimplementedRouterServer) TrackPayment(req *TrackPaymentRequest, srv Router_TrackPaymentServer) error {
return status.Errorf(codes.Unimplemented, "method TrackPayment not implemented")
}
func (*UnimplementedRouterServer) HtlcInterceptor(srv Router_HtlcInterceptorServer) error {
return status.Errorf(codes.Unimplemented, "method HtlcInterceptor not implemented")
}
func RegisterRouterServer(s *grpc.Server, srv RouterServer) {
s.RegisterService(&_Router_serviceDesc, srv)
@@ -2547,6 +2827,32 @@ func (x *routerTrackPaymentServer) Send(m *PaymentStatus) error {
return x.ServerStream.SendMsg(m)
}
func _Router_HtlcInterceptor_Handler(srv interface{}, stream grpc.ServerStream) error {
return srv.(RouterServer).HtlcInterceptor(&routerHtlcInterceptorServer{stream})
}
type Router_HtlcInterceptorServer interface {
Send(*ForwardHtlcInterceptRequest) error
Recv() (*ForwardHtlcInterceptResponse, error)
grpc.ServerStream
}
type routerHtlcInterceptorServer struct {
grpc.ServerStream
}
func (x *routerHtlcInterceptorServer) Send(m *ForwardHtlcInterceptRequest) error {
return x.ServerStream.SendMsg(m)
}
func (x *routerHtlcInterceptorServer) Recv() (*ForwardHtlcInterceptResponse, error) {
m := new(ForwardHtlcInterceptResponse)
if err := x.ServerStream.RecvMsg(m); err != nil {
return nil, err
}
return m, nil
}
var _Router_serviceDesc = grpc.ServiceDesc{
ServiceName: "routerrpc.Router",
HandlerType: (*RouterServer)(nil),
@@ -2606,6 +2912,12 @@ var _Router_serviceDesc = grpc.ServiceDesc{
Handler: _Router_TrackPayment_Handler,
ServerStreams: true,
},
{
StreamName: "HtlcInterceptor",
Handler: _Router_HtlcInterceptor_Handler,
ServerStreams: true,
ClientStreams: true,
},
},
Metadata: "routerrpc/router.proto",
}
+65
View File
@@ -98,6 +98,15 @@ service Router {
rpc TrackPayment (TrackPaymentRequest) returns (stream PaymentStatus) {
option deprecated = true;
}
/**
HtlcInterceptor dispatches a bi-directional streaming RPC in which
Forwarded HTLC requests are sent to the client and the client responds with
a boolean that tells LND if this htlc should be intercepted.
In case of interception, the htlc can be either settled, cancelled or
resumed later by using the ResolveHoldForward endpoint.
*/
rpc HtlcInterceptor (stream ForwardHtlcInterceptResponse) returns (stream ForwardHtlcInterceptRequest);
}
message SendPaymentRequest {
@@ -579,3 +588,59 @@ message PaymentStatus {
*/
repeated lnrpc.HTLCAttempt htlcs = 4;
}
message CircuitKey {
/// The id of the channel that the is part of this circuit.
uint64 chan_id = 1;
/// The index of the incoming htlc in the incoming channel.
uint64 htlc_id = 2;
}
message ForwardHtlcInterceptRequest {
/*
The key of this forwarded htlc. It defines the incoming channel id and
the index in this channel.
*/
CircuitKey incoming_circuit_key = 1;
/*
The htlc payment hash. This value is not guaranteed to be unique per
request.
*/
bytes htlc_payment_hash = 2;
/// The htlc amount.
uint64 amount_msat = 3;
/// The htlc expiry.
uint32 expiry = 4;
}
/**
ForwardHtlcInterceptResponse enables the caller to resolve a previously hold forward.
The caller can choose either to:
- `Resume`: Execute the default behavior (usually forward).
- `Reject`: Fail the htlc backwards.
- `Settle`: Settle this htlc with a given preimage.
*/
message ForwardHtlcInterceptResponse {
/**
The key of this forwarded htlc. It defines the incoming channel id and
the index in this channel.
*/
CircuitKey incoming_circuit_key = 1;
// The resolve action for this intercepted htlc.
ResolveHoldForwardAction action = 2;
// The preimage in case the resolve action is Settle.
bytes preimage = 3;
}
enum ResolveHoldForwardAction {
SETTLE = 0;
FAIL = 1;
RESUME = 2;
}
+48
View File
@@ -844,6 +844,21 @@
}
}
},
"routerrpcCircuitKey": {
"type": "object",
"properties": {
"chan_id": {
"type": "string",
"format": "uint64",
"description": "/ The id of the channel that the is part of this circuit."
},
"htlc_id": {
"type": "string",
"format": "uint64",
"description": "/ The index of the incoming htlc in the incoming channel."
}
}
},
"routerrpcFailureDetail": {
"type": "string",
"enum": [
@@ -885,6 +900,30 @@
"routerrpcForwardFailEvent": {
"type": "object"
},
"routerrpcForwardHtlcInterceptRequest": {
"type": "object",
"properties": {
"incoming_circuit_key": {
"$ref": "#/definitions/routerrpcCircuitKey",
"description": "The key of this forwarded htlc. It defines the incoming channel id and\nthe index in this channel."
},
"htlc_payment_hash": {
"type": "string",
"format": "byte",
"description": "The htlc payment hash. This value is not guaranteed to be unique per\nrequest."
},
"amount_msat": {
"type": "string",
"format": "uint64",
"description": "/ The htlc amount."
},
"expiry": {
"type": "integer",
"format": "int64",
"description": "/ The htlc expiry."
}
}
},
"routerrpcHtlcEvent": {
"type": "object",
"properties": {
@@ -1110,6 +1149,15 @@
"routerrpcResetMissionControlResponse": {
"type": "object"
},
"routerrpcResolveHoldForwardAction": {
"type": "string",
"enum": [
"SETTLE",
"FAIL",
"RESUME"
],
"default": "SETTLE"
},
"routerrpcRouteFeeRequest": {
"type": "object",
"properties": {
+4
View File
@@ -70,6 +70,10 @@ type RouterBackend struct {
// SubscribeHtlcEvents returns a subscription client for the node's
// htlc events.
SubscribeHtlcEvents func() (*subscribe.Client, error)
// InterceptableForwarder exposes the ability to intercept forward events
// by letting the router register a ForwardInterceptor.
InterceptableForwarder htlcswitch.InterceptableHtlcForwarder
}
// MissionControl defines the mission control dependencies of routerrpc.
+31 -2
View File
@@ -34,6 +34,11 @@ const (
var (
errServerShuttingDown = errors.New("routerrpc server shutting down")
// ErrInterceptorAlreadyExists is an error returned when the a new stream
// is opened and there is already one active interceptor.
// The user must disconnect prior to open another stream.
ErrInterceptorAlreadyExists = errors.New("interceptor already exists")
// macaroonOps are the set of capabilities that our minted macaroon (if
// it doesn't already exist) will have.
macaroonOps = []bakery.Op{
@@ -97,6 +102,10 @@ var (
Entity: "offchain",
Action: "read",
}},
"/routerrpc.Router/HtlcInterceptor": {{
Entity: "offchain",
Action: "write",
}},
}
// DefaultRouterMacFilename is the default name of the router macaroon
@@ -108,8 +117,9 @@ var (
// Server is a stand alone sub RPC server which exposes functionality that
// allows clients to route arbitrary payment through the Lightning Network.
type Server struct {
started int32 // To be used atomically.
shutdown int32 // To be used atomically.
started int32 // To be used atomically.
shutdown int32 // To be used atomically.
forwardInterceptorActive int32 // To be used atomically.
cfg *Config
@@ -609,3 +619,22 @@ func (s *Server) SubscribeHtlcEvents(req *SubscribeHtlcEventsRequest,
}
}
}
// HtlcInterceptor is a bidirectional stream for streaming interception
// requests to the caller.
// Upon connection it does the following:
// 1. Check if there is already a live stream, if yes it rejects the request.
// 2. Regsitered a ForwardInterceptor
// 3. Delivers to the caller every √√ and detect his answer.
// It uses a local implementation of holdForwardsStore to keep all the hold
// forwards and find them when manual resolution is later needed.
func (s *Server) HtlcInterceptor(stream Router_HtlcInterceptorServer) error {
// We ensure there is only one interceptor at a time.
if !atomic.CompareAndSwapInt32(&s.forwardInterceptorActive, 0, 1) {
return ErrInterceptorAlreadyExists
}
defer atomic.CompareAndSwapInt32(&s.forwardInterceptorActive, 1, 0)
// run the forward interceptor.
return newForwardInterceptor(s, stream).run()
}