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Merge pull request #65 from wpaulino/sweep-conf-target

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multi: expose confirmation target for loop out HTLC sweeps
pull/68/head
Olaoluwa Osuntokun 5 years ago committed by GitHub
parent 9df227d9d0 47321ba4a4
commit e8d696e119
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
9 changed files with 229 additions and 83 deletions
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6
client.go
Unescape Escape View File

@ -42,6 +42,12 @@ var (
// is too soon for us.
ErrExpiryTooFar = errors.New("swap expiry too far")
// ErrSweepConfTargetTooFar is returned when the client proposes a
// confirmation target to sweep the on-chain HTLC of a Loop Out that is
// beyond the expiration height proposed by the server.
ErrSweepConfTargetTooFar = errors.New("sweep confirmation target is " +
"beyond swap expiration height")
serverRPCTimeout = 30 * time.Second
republishDelay = 10 * time.Second

12
cmd/loop/loopout.go
Unescape Escape View File

@ -36,6 +36,13 @@ var loopOutCommand = cli.Command{
Name: "amt",
Usage: "the amount in satoshis to loop out",
},
cli.Uint64Flag{
Name: "conf_target",
Usage: "the number of blocks from the swap " +
"initiation height that the on-chain HTLC " +
"should be swept within",
Value: uint64(loop.DefaultSweepConfTarget),
},
},
Action: loopOut,
}
@ -75,8 +82,10 @@ func loopOut(ctx *cli.Context) error {
}
defer cleanup()
sweepConfTarget := int32(ctx.Uint64("conf_target"))
quoteReq := &looprpc.QuoteRequest{
Amt: int64(amt),
Amt: int64(amt),
ConfTarget: sweepConfTarget,
}
quote, err := client.LoopOutQuote(context.Background(), quoteReq)
if err != nil {
@ -103,6 +112,7 @@ func loopOut(ctx *cli.Context) error {
MaxPrepayRoutingFee: int64(*limits.maxPrepayRoutingFee),
MaxSwapRoutingFee: int64(*limits.maxSwapRoutingFee),
LoopOutChannel: unchargeChannel,
SweepConfTarget: sweepConfTarget,
})
if err != nil {
return err

19
cmd/loop/quote.go
Unescape Escape View File

@ -12,12 +12,22 @@ var quoteCommand = cli.Command{
Usage: "get a quote for the cost of a swap",
ArgsUsage: "amt",
Description: "Allows to determine the cost of a swap up front",
Action: quote,
Flags: []cli.Flag{
cli.Uint64Flag{
Name: "conf_target",
Usage: "the number of blocks from the swap " +
"initiation height that the on-chain HTLC " +
"should be swept within in a Loop Out",
Value: 6,
},
},
Action: quote,
}
func quote(ctx *cli.Context) error {
// Show command help if no arguments and flags were provided.
if ctx.NArg() < 1 {
// Show command help if the incorrect number arguments and/or flags were
// provided.
if ctx.NArg() != 1 || ctx.NumFlags() > 1 {
cli.ShowCommandHelp(ctx, "quote")
return nil
}
@ -36,7 +46,8 @@ func quote(ctx *cli.Context) error {
ctxb := context.Background()
resp, err := client.LoopOutQuote(ctxb, &looprpc.QuoteRequest{
Amt: int64(amt),
Amt: int64(amt),
ConfTarget: int32(ctx.Uint64("conf_target")),
})
if err != nil {
return err

40
cmd/loopd/swapclient_server.go
Unescape Escape View File

@ -16,7 +16,14 @@ import (
"github.com/lightninglabs/loop/looprpc"
)
const completedSwapsCount = 5
const (
completedSwapsCount = 5
// minConfTarget is the minimum confirmation target we'll allow clients
// to specify. This is driven by the minimum confirmation target allowed
// by the backing fee estimator.
minConfTarget = 2
)
// swapClientServer implements the grpc service exposed by loopd.
type swapClientServer struct {
@ -34,6 +41,13 @@ func (s *swapClientServer) LoopOut(ctx context.Context,
logger.Infof("Loop out request received")
sweepConfTarget, err := validateConfTarget(
in.SweepConfTarget, loop.DefaultSweepConfTarget,
)
if err != nil {
return nil, err
}
var sweepAddr btcutil.Address
if in.Dest == "" {
// Generate sweep address if none specified.
@ -60,7 +74,7 @@ func (s *swapClientServer) LoopOut(ctx context.Context,
MaxPrepayRoutingFee: btcutil.Amount(in.MaxPrepayRoutingFee),
MaxSwapRoutingFee: btcutil.Amount(in.MaxSwapRoutingFee),
MaxSwapFee: btcutil.Amount(in.MaxSwapFee),
SweepConfTarget: defaultConfTarget,
SweepConfTarget: sweepConfTarget,
}
if in.LoopOutChannel != 0 {
req.LoopOutChannel = &in.LoopOutChannel
@ -242,9 +256,15 @@ func (s *swapClientServer) LoopOutTerms(ctx context.Context,
func (s *swapClientServer) LoopOutQuote(ctx context.Context,
req *looprpc.QuoteRequest) (*looprpc.QuoteResponse, error) {
confTarget, err := validateConfTarget(
req.ConfTarget, loop.DefaultSweepConfTarget,
)
if err != nil {
return nil, err
}
quote, err := s.impl.LoopOutQuote(ctx, &loop.LoopOutQuoteRequest{
Amount: btcutil.Amount(req.Amt),
SweepConfTarget: defaultConfTarget,
SweepConfTarget: confTarget,
})
if err != nil {
return nil, err
@ -323,3 +343,17 @@ func (s *swapClientServer) LoopIn(ctx context.Context,
HtlcAddress: htlc.String(),
}, nil
}
// validateConfTarget ensures the given confirmation target is valid. If one
// isn't specified (0 value), then the default target is used.
func validateConfTarget(target, defaultTarget int32) (int32, error) {
switch {
// Ensure the target respects our minimum threshold.
case target < minConfTarget:
return 0, fmt.Errorf("a confirmation target of at least %v "+
"must be provided", minConfTarget)
default:
return target, nil
}
}

43
loopout.go
Unescape Escape View File

@ -20,7 +20,18 @@ import (
var (
// MinLoopOutPreimageRevealDelta configures the minimum number of
// remaining blocks before htlc expiry required to reveal preimage.
MinLoopOutPreimageRevealDelta = int32(20)
MinLoopOutPreimageRevealDelta int32 = 20
// DefaultSweepConfTarget is the default confirmation target we'll use
// when sweeping on-chain HTLCs.
DefaultSweepConfTarget int32 = 6
// DefaultSweepConfTargetDelta is the delta of blocks from a Loop Out
// swap's expiration height at which we begin to use the default sweep
// confirmation target.
//
// TODO(wilmer): tune?
DefaultSweepConfTargetDelta int32 = DefaultSweepConfTarget * 2
)
// loopOutSwap contains all the in-memory state related to a pending loop out
@ -577,22 +588,29 @@ func (s *loopOutSwap) sweep(ctx context.Context,
htlcValue btcutil.Amount) error {
witnessFunc := func(sig []byte) (wire.TxWitness, error) {
return s.htlc.GenSuccessWitness(
sig, s.Preimage,
)
return s.htlc.GenSuccessWitness(sig, s.Preimage)
}
// Calculate sweep tx fee
// Calculate the transaction fee based on the confirmation target
// required to sweep the HTLC before the timeout. We'll use the
// confirmation target provided by the client unless we've come too
// close to the expiration height, in which case we'll use the default
// if it is better than what the client provided.
confTarget := s.SweepConfTarget
if s.CltvExpiry-s.height >= DefaultSweepConfTargetDelta &&
confTarget > DefaultSweepConfTarget {
confTarget = DefaultSweepConfTarget
}
fee, err := s.sweeper.GetSweepFee(
ctx, s.htlc.AddSuccessToEstimator,
s.SweepConfTarget,
ctx, s.htlc.AddSuccessToEstimator, confTarget,
)
if err != nil {
return err
}
// Ensure it doesn't exceed our maximum fee allowed.
if fee > s.MaxMinerFee {
s.log.Warnf("Required miner fee %v exceeds max of %v",
s.log.Warnf("Required fee %v exceeds max miner fee of %v",
fee, s.MaxMinerFee)
if s.state == loopdb.StatePreimageRevealed {
@ -608,8 +626,7 @@ func (s *loopOutSwap) sweep(ctx context.Context,
// Create sweep tx.
sweepTx, err := s.sweeper.CreateSweepTx(
ctx, s.height, s.htlc, htlcOutpoint,
s.ReceiverKey, witnessFunc,
ctx, s.height, s.htlc, htlcOutpoint, s.ReceiverKey, witnessFunc,
htlcValue, fee, s.DestAddr,
)
if err != nil {
@ -686,5 +703,11 @@ func validateLoopOutContract(lnd *lndclient.LndServices,
return ErrExpiryTooSoon
}
// Ensure the client has provided a sweep confirmation target that does
// not exceed the height at which we revert back to using the default.
if height+request.SweepConfTarget >= response.expiry-DefaultSweepConfTargetDelta {
return ErrSweepConfTargetTooFar
}
return nil
}

157
looprpc/client.pb.go
Unescape Escape View File

@ -154,7 +154,11 @@ type LoopOutRequest struct {
//*
//The channel to loop out, the channel to loop out is selected based on the
//lowest routing fee for the swap payment to the server.
LoopOutChannel uint64 `protobuf:"varint,8,opt,name=loop_out_channel,json=loopOutChannel,proto3" json:"loop_out_channel,omitempty"`
LoopOutChannel uint64 `protobuf:"varint,8,opt,name=loop_out_channel,json=loopOutChannel,proto3" json:"loop_out_channel,omitempty"`
//*
//The number of blocks from the on-chain HTLC's confirmation height that it
//should be swept within.
SweepConfTarget int32 `protobuf:"varint,9,opt,name=sweep_conf_target,json=sweepConfTarget,proto3" json:"sweep_conf_target,omitempty"`
XXX_NoUnkeyedLiteral struct{} `json:"-"`
XXX_unrecognized []byte `json:"-"`
XXX_sizecache int32 `json:"-"`
@ -241,6 +245,13 @@ func (m *LoopOutRequest) GetLoopOutChannel() uint64 {
return 0
}
func (m *LoopOutRequest) GetSweepConfTarget() int32 {
if m != nil {
return m.SweepConfTarget
}
return 0
}
type LoopInRequest struct {
//*
//Requested swap amount in sat. This does not include the swap and miner
@ -683,7 +694,13 @@ func (m *TermsResponse) GetCltvDelta() int32 {
type QuoteRequest struct {
//*
//The amount to swap in satoshis.
Amt int64 `protobuf:"varint,1,opt,name=amt,proto3" json:"amt,omitempty"`
Amt int64 `protobuf:"varint,1,opt,name=amt,proto3" json:"amt,omitempty"`
//*
//The confirmation target that should be used either for the sweep of the
//on-chain HTLC broadcast by the swap server in the case of a Loop Out, or for
//the confirmation of the on-chain HTLC broadcast by the swap client in the
//case of a Loop In.
ConfTarget int32 `protobuf:"varint,2,opt,name=conf_target,json=confTarget,proto3" json:"conf_target,omitempty"`
XXX_NoUnkeyedLiteral struct{} `json:"-"`
XXX_unrecognized []byte `json:"-"`
XXX_sizecache int32 `json:"-"`
@ -721,6 +738,13 @@ func (m *QuoteRequest) GetAmt() int64 {
return 0
}
func (m *QuoteRequest) GetConfTarget() int32 {
if m != nil {
return m.ConfTarget
}
return 0
}
type QuoteResponse struct {
//*
//The fee that the swap server is charging for the swap.
@ -799,69 +823,72 @@ func init() {
func init() { proto.RegisterFile("client.proto", fileDescriptor_014de31d7ac8c57c) }
var fileDescriptor_014de31d7ac8c57c = []byte{
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// 1028 bytes of a gzipped FileDescriptorProto
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}
// Reference imports to suppress errors if they are not otherwise used.

8
looprpc/client.pb.gw.go
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@ -50,6 +50,10 @@ func request_SwapClient_LoopOutTerms_0(ctx context.Context, marshaler runtime.Ma
}
var (
filter_SwapClient_LoopOutQuote_0 = &utilities.DoubleArray{Encoding: map[string]int{"amt": 0}, Base: []int{1, 1, 0}, Check: []int{0, 1, 2}}
)
func request_SwapClient_LoopOutQuote_0(ctx context.Context, marshaler runtime.Marshaler, client SwapClientClient, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
var protoReq QuoteRequest
var metadata runtime.ServerMetadata
@ -72,6 +76,10 @@ func request_SwapClient_LoopOutQuote_0(ctx context.Context, marshaler runtime.Ma
return nil, metadata, status.Errorf(codes.InvalidArgument, "type mismatch, parameter: %s, error: %v", "amt", err)
}
if err := runtime.PopulateQueryParameters(&protoReq, req.URL.Query(), filter_SwapClient_LoopOutQuote_0); err != nil {
return nil, metadata, status.Errorf(codes.InvalidArgument, "%v", err)
}
msg, err := client.LoopOutQuote(ctx, &protoReq, grpc.Header(&metadata.HeaderMD), grpc.Trailer(&metadata.TrailerMD))
return msg, metadata, err

14
looprpc/client.proto
Unescape Escape View File

@ -127,6 +127,12 @@ message LoopOutRequest {
lowest routing fee for the swap payment to the server.
*/
uint64 loop_out_channel = 8;
/**
The number of blocks from the on-chain HTLC's confirmation height that it
should be swept within.
*/
int32 sweep_conf_target = 9;
}
message LoopInRequest {
@ -328,6 +334,14 @@ message QuoteRequest {
The amount to swap in satoshis.
*/
int64 amt = 1;
/**
The confirmation target that should be used either for the sweep of the
on-chain HTLC broadcast by the swap server in the case of a Loop Out, or for
the confirmation of the on-chain HTLC broadcast by the swap client in the
case of a Loop In.
*/
int32 conf_target = 2;
}
message QuoteResponse {

13
looprpc/client.swagger.json
Unescape Escape View File

@ -61,6 +61,14 @@
"required": true,
"type": "string",
"format": "int64"
},
{
"name": "conf_target",
"description": "*\nThe confirmation target that should be used either for the sweep of the\non-chain HTLC broadcast by the swap server in the case of a Loop Out, or for\nthe confirmation of the on-chain HTLC broadcast by the swap client in the\ncase of a Loop In.",
"in": "query",
"required": false,
"type": "integer",
"format": "int32"
}
],
"tags": [
@ -128,6 +136,11 @@
"type": "string",
"format": "uint64",
"description": "*\nThe channel to loop out, the channel to loop out is selected based on the\nlowest routing fee for the swap payment to the server."
},
"sweep_conf_target": {
"type": "integer",
"format": "int32",
"description": "*\nThe number of blocks from the on-chain HTLC's confirmation height that it\nshould be swept within."
}
}
},

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