Merge pull request #661 from hieblmi/abandon-swaps

Abandon API for pending Loop-in swaps

client.go

@@ -17,6 +17,7 @@ import (
 	"github.com/lightninglabs/loop/loopdb"
 	"github.com/lightninglabs/loop/swap"
 	"github.com/lightninglabs/loop/sweep"
+	"github.com/lightningnetwork/lnd/lntypes"
 	"github.com/lightningnetwork/lnd/routing/route"
 	"google.golang.org/grpc/status"
 )
@@ -68,6 +69,11 @@ type Client struct {
 	started uint32 // To be used atomically.
 	errChan chan error
 
+	// abandonChans allows for accessing a swap's abandon channel by
+	// providing its swap hash. This map is used to look up the abandon
+	// channel of a swap if the client requests to abandon it.
+	abandonChans map[lntypes.Hash]chan struct{}
+
 	lndServices *lndclient.LndServices
 	sweeper     *sweep.Sweeper
 	executor    *executor
@@ -179,6 +185,7 @@ func NewClient(dbDir string, loopDB loopdb.SwapStore,
 		sweeper:      sweeper,
 		executor:     executor,
 		resumeReady:  make(chan struct{}),
+		abandonChans: make(map[lntypes.Hash]chan struct{}),
 	}
 
 	cleanup := func() {
@@ -317,10 +324,10 @@ func (s *Client) Run(ctx context.Context, statusChan chan<- SwapInfo) error {
 	}()
 
 	// Main event loop.
-	err = s.executor.run(mainCtx, statusChan)
+	err = s.executor.run(mainCtx, statusChan, s.abandonChans)
 
 	// Consider canceled as happy flow.
-	if err == context.Canceled {
+	if errors.Is(err, context.Canceled) {
 		err = nil
 	}
 
@@ -374,6 +381,12 @@ func (s *Client) resumeSwaps(ctx context.Context,
 			continue
 		}
 
+		// Store the swap's abandon channel so that the client can
+		// abandon the swap by providing the swap hash.
+		s.executor.Lock()
+		s.abandonChans[swap.hash] = swap.abandonChan
+		s.executor.Unlock()
+
 		s.executor.initiateSwap(ctx, swap)
 	}
 }
@@ -578,6 +591,10 @@ func (s *Client) LoopIn(globalCtx context.Context,
 	}
 	swap := initResult.swap
 
+	s.executor.Lock()
+	s.abandonChans[swap.hash] = swap.abandonChan
+	s.executor.Unlock()
+
 	// Post swap to the main loop.
 	s.executor.initiateSwap(globalCtx, swap)
 
@@ -753,3 +770,26 @@ func (s *Client) Probe(ctx context.Context, req *ProbeRequest) error {
 		req.RouteHints,
 	)
 }
+
+// AbandonSwap sends a signal on the abandon channel of the swap identified by
+// the passed swap hash. This will cause the swap to abandon itself.
+func (s *Client) AbandonSwap(ctx context.Context,
+	req *AbandonSwapRequest) error {
+
+	if req == nil {
+		return errors.New("no request provided")
+	}
+
+	s.executor.Lock()
+	defer s.executor.Unlock()
+
+	select {
+	case s.abandonChans[req.SwapHash] <- struct{}{}:
+	case <-ctx.Done():
+		return ctx.Err()
+	default:
+		// This is to avoid writing to a full channel.
+	}
+
+	return nil
+}

cmd/loop/main.go

@@ -147,7 +147,7 @@ func main() {
 		monitorCommand, quoteCommand, listAuthCommand,
 		listSwapsCommand, swapInfoCommand, getLiquidityParamsCommand,
 		setLiquidityRuleCommand, suggestSwapCommand, setParamsCommand,
-		getInfoCommand,
+		getInfoCommand, abandonSwapCommand,
 	}
 
 	err := app.Run(os.Args)

cmd/loop/swaps.go

@@ -90,3 +90,73 @@ func swapInfo(ctx *cli.Context) error {
 	printRespJSON(resp)
 	return nil
 }
+
+var abandonSwapCommand = cli.Command{
+	Name:  "abandonswap",
+	Usage: "abandon a swap with a given swap hash",
+	Description: "This command overrides the database and abandons a " +
+		"swap with a given swap hash.\n\n" +
+		"!!! This command might potentially lead to loss of funds if " +
+		"it is applied to swaps that are still waiting for pending " +
+		"user funds. Before executing this command make sure that " +
+		"no funds are locked by the swap.",
+	ArgsUsage: "ID",
+	Flags: []cli.Flag{
+		cli.BoolFlag{
+			Name: "i_know_what_i_am_doing",
+			Usage: "Specify this flag if you made sure that you " +
+				"read and understood the following " +
+				"consequence of applying this command.",
+		},
+	},
+	Action: abandonSwap,
+}
+
+func abandonSwap(ctx *cli.Context) error {
+	args := ctx.Args()
+
+	var id string
+	switch {
+	case ctx.IsSet("id"):
+		id = ctx.String("id")
+
+	case ctx.NArg() > 0:
+		id = args[0]
+		args = args.Tail() // nolint:wastedassign
+
+	default:
+		// Show command help if no arguments and flags were provided.
+		return cli.ShowCommandHelp(ctx, "abandonswap")
+	}
+
+	if len(id) != hex.EncodedLen(lntypes.HashSize) {
+		return fmt.Errorf("invalid swap ID")
+	}
+	idBytes, err := hex.DecodeString(id)
+	if err != nil {
+		return fmt.Errorf("cannot hex decode id: %v", err)
+	}
+
+	client, cleanup, err := getClient(ctx)
+	if err != nil {
+		return err
+	}
+	defer cleanup()
+
+	if !ctx.Bool("i_know_what_i_am_doing") {
+		return cli.ShowCommandHelp(ctx, "abandonswap")
+	}
+
+	resp, err := client.AbandonSwap(
+		context.Background(), &looprpc.AbandonSwapRequest{
+			Id:                idBytes,
+			IKnowWhatIAmDoing: ctx.Bool("i_know_what_i_am_doing"),
+		},
+	)
+	if err != nil {
+		return err
+	}
+
+	printRespJSON(resp)
+	return nil
+}

executor.go

@@ -13,6 +13,7 @@ import (
 	"github.com/lightninglabs/lndclient"
 	"github.com/lightninglabs/loop/loopdb"
 	"github.com/lightninglabs/loop/sweep"
+	"github.com/lightningnetwork/lnd/lntypes"
 	"github.com/lightningnetwork/lnd/queue"
 )
 
@@ -46,6 +47,8 @@ type executor struct {
 	currentHeight uint32
 	ready         chan struct{}
 
+	sync.Mutex
+
 	executorConfig
 }
 
@@ -61,7 +64,8 @@ func newExecutor(cfg *executorConfig) *executor {
 // run starts the executor event loop. It accepts and executes new swaps,
 // providing them with required config data.
 func (s *executor) run(mainCtx context.Context,
-	statusChan chan<- SwapInfo) error {
+	statusChan chan<- SwapInfo,
+	abandonChans map[lntypes.Hash]chan struct{}) error {
 
 	var (
 		err            error
@@ -167,6 +171,15 @@ func (s *executor) run(mainCtx context.Context,
 					log.Errorf("Execute error: %v", err)
 				}
 
+				// If a loop-in ended we have to remove its
+				// abandon channel from our abandonChans map
+				// since the swap finalized.
+				if swap, ok := newSwap.(*loopInSwap); ok {
+					s.Lock()
+					delete(abandonChans, swap.hash)
+					s.Unlock()
+				}
+
 				select {
 				case swapDoneChan <- swapID:
 				case <-mainCtx.Done():

interface.go

@@ -394,3 +394,9 @@ type ProbeRequest struct {
 	// Optional hop hints.
 	RouteHints [][]zpay32.HopHint
 }
+
+// AbandonSwapRequest specifies the swap to abandon. It is identified by its
+// swap hash.
+type AbandonSwapRequest struct {
+	SwapHash lntypes.Hash
+}

loopd/perms/perms.go

@@ -31,6 +31,16 @@ var RequiredPermissions = map[string][]bakery.Op{
 		Entity: "swap",
 		Action: "read",
 	}},
+	"/looprpc.SwapClient/AbandonSwap": {{
+		Entity: "swap",
+		Action: "execute",
+	}, {
+		Entity: "loop",
+		Action: "in",
+	}, {
+		Entity: "loop",
+		Action: "out",
+	}},
 	"/looprpc.SwapClient/LoopOutTerms": {{
 		Entity: "terms",
 		Action: "read",

loopd/swapclient_server.go

@@ -288,6 +288,9 @@ func (s *swapClientServer) marshallSwap(loopSwap *loop.SwapInfo) (
 	case loopdb.StateFailIncorrectHtlcAmt:
 		failureReason = clientrpc.FailureReason_FAILURE_REASON_INCORRECT_AMOUNT
 
+	case loopdb.StateFailAbandoned:
+		failureReason = clientrpc.FailureReason_FAILURE_REASON_ABANDONED
+
 	default:
 		return nil, fmt.Errorf("unknown swap state: %v", loopSwap.State)
 	}
@@ -508,6 +511,49 @@ func (s *swapClientServer) SwapInfo(_ context.Context,
 	return s.marshallSwap(&swp)
 }
 
+// AbandonSwap requests the server to abandon a swap with the given hash.
+func (s *swapClientServer) AbandonSwap(ctx context.Context,
+	req *clientrpc.AbandonSwapRequest) (*clientrpc.AbandonSwapResponse,
+	error) {
+
+	if !req.IKnowWhatIAmDoing {
+		return nil, fmt.Errorf("please read the AbandonSwap API " +
+			"documentation")
+	}
+
+	swapHash, err := lntypes.MakeHash(req.Id)
+	if err != nil {
+		return nil, fmt.Errorf("error parsing swap hash: %v", err)
+	}
+
+	s.swapsLock.Lock()
+	swap, ok := s.swaps[swapHash]
+	s.swapsLock.Unlock()
+	if !ok {
+		return nil, fmt.Errorf("swap with hash %s not found", req.Id)
+	}
+
+	if swap.SwapType.IsOut() {
+		return nil, fmt.Errorf("abandoning loop out swaps is not " +
+			"supported yet")
+	}
+
+	// If the swap is in a final state, we cannot abandon it.
+	if swap.State.IsFinal() {
+		return nil, fmt.Errorf("cannot abandon swap in final state, "+
+			"state = %s, hash = %s", swap.State.String(), swapHash)
+	}
+
+	err = s.impl.AbandonSwap(ctx, &loop.AbandonSwapRequest{
+		SwapHash: swapHash,
+	})
+	if err != nil {
+		return nil, fmt.Errorf("error abandoning swap: %v", err)
+	}
+
+	return &clientrpc.AbandonSwapResponse{}, nil
+}
+
 // LoopOutTerms returns the terms that the server enforces for loop out swaps.
 func (s *swapClientServer) LoopOutTerms(ctx context.Context,
 	_ *clientrpc.TermsRequest) (*clientrpc.OutTermsResponse, error) {

loopdb/swapstate.go

@@ -64,6 +64,10 @@ const (
 	// StateFailIncorrectHtlcAmt indicates that the amount of an externally
 	// published loop in htlc didn't match the swap amount.
 	StateFailIncorrectHtlcAmt SwapState = 10
+
+	// StateFailAbandoned indicates that a swap has been abandoned. Its
+	// execution has been canceled. It won't further be processed.
+	StateFailAbandoned SwapState = 11
 )
 
 // SwapStateType defines the types of swap states that exist. Every swap state
@@ -98,6 +102,18 @@ func (s SwapState) Type() SwapStateType {
 	return StateTypeFail
 }
 
+// IsPending returns true if the swap is in a pending state.
+func (s SwapState) IsPending() bool {
+	return s == StateInitiated || s == StateHtlcPublished ||
+		s == StatePreimageRevealed || s == StateFailTemporary ||
+		s == StateInvoiceSettled
+}
+
+// IsFinal returns true if the swap is in a final state.
+func (s SwapState) IsFinal() bool {
+	return !s.IsPending()
+}
+
 // String returns a string representation of the swap's state.
 func (s SwapState) String() string {
 	switch s {
@@ -134,6 +150,9 @@ func (s SwapState) String() string {
 	case StateFailIncorrectHtlcAmt:
 		return "IncorrectHtlcAmt"
 
+	case StateFailAbandoned:
+		return "FailAbandoned"
+
 	default:
 		return "Unknown"
 	}

loopin.go

@@ -48,6 +48,10 @@ var (
 	// TimeoutTxConfTarget defines the confirmation target for the loop in
 	// timeout tx.
 	TimeoutTxConfTarget = int32(2)
+
+	// ErrSwapFinalized is returned when a to be executed swap is already in
+	// a final state.
+	ErrSwapFinalized = errors.New("swap is in a final state")
 )
 
 // loopInSwap contains all the in-memory state related to a pending loop in
@@ -70,6 +74,8 @@ type loopInSwap struct {
 
 	timeoutAddr btcutil.Address
 
+	abandonChan chan struct{}
+
 	wg sync.WaitGroup
 }
 
@@ -308,6 +314,8 @@ func newLoopInSwap(globalCtx context.Context, cfg *swapConfig,
 		swap.log.Infof("Server message: %v", swapResp.serverMessage)
 	}
 
+	swap.abandonChan = make(chan struct{}, 1)
+
 	return &loopInInitResult{
 		swap:          swap,
 		serverMessage: swapResp.serverMessage,
@@ -413,6 +421,10 @@ func resumeLoopInSwap(_ context.Context, cfg *swapConfig,
 		swap.cost = lastUpdate.Cost
 	}
 
+	// Upon restoring the swap we also need to assign a new abandon channel
+	// that the client can use to signal that the swap should be abandoned.
+	swap.abandonChan = make(chan struct{}, 1)
+
 	return swap, nil
 }
 
@@ -518,6 +530,11 @@ func (s *loopInSwap) execute(mainCtx context.Context,
 	// error occurs.
 	err = s.executeSwap(mainCtx)
 
+	// Stop the execution if the swap has been abandoned.
+	if err != nil && s.state == loopdb.StateFailAbandoned {
+		return err
+	}
+
 	// Sanity check. If there is no error, the swap must be in a final
 	// state.
 	if err == nil && s.state.Type() == loopdb.StateTypePending {
@@ -553,6 +570,11 @@ func (s *loopInSwap) execute(mainCtx context.Context,
 func (s *loopInSwap) executeSwap(globalCtx context.Context) error {
 	var err error
 
+	// If the swap is already in a final state, we can return immediately.
+	if s.state.IsFinal() {
+		return ErrSwapFinalized
+	}
+
 	// For loop in, the client takes the first step by publishing the
 	// on-chain htlc. Only do this if we haven't already done so in a
 	// previous run.
@@ -688,6 +710,11 @@ func (s *loopInSwap) waitForHtlcConf(globalCtx context.Context) (
 		case notification := <-s.blockEpochChan:
 			s.height = notification.(int32)
 
+		// If the client requested the swap to be abandoned, we override
+		// the status in the database.
+		case <-s.abandonChan:
+			return nil, s.setStateAbandoned(ctx)
+
 		// Cancel.
 		case <-globalCtx.Done():
 			return nil, globalCtx.Err()
@@ -840,6 +867,11 @@ func (s *loopInSwap) waitForSwapComplete(ctx context.Context,
 	htlcKeyRevealed := false
 	for !htlcSpend || !invoiceFinalized {
 		select {
+		// If the client requested the swap to be abandoned, we override
+		// the status in the database.
+		case <-s.abandonChan:
+			return s.setStateAbandoned(ctx)
+
 		// Spend notification error.
 		case err := <-spendErr:
 			return err
@@ -1062,6 +1094,31 @@ func (s *loopInSwap) publishTimeoutTx(ctx context.Context,
 	return fee, nil
 }
 
+// setStateAbandoned stores the abandoned state and announces it. It also
+// cancels the swap invoice so the server can't settle it.
+func (s *loopInSwap) setStateAbandoned(ctx context.Context) error {
+	s.log.Infof("Abandoning swap %v...", s.hash)
+
+	if !s.state.IsPending() {
+		return fmt.Errorf("cannot abandon swap in state %v", s.state)
+	}
+
+	s.setState(loopdb.StateFailAbandoned)
+
+	err := s.persistAndAnnounceState(ctx)
+	if err != nil {
+		return err
+	}
+
+	// If the invoice is already settled or canceled, this is a nop.
+	_ = s.lnd.Invoices.CancelInvoice(ctx, s.hash)
+
+	return fmt.Errorf("swap hash "+
+		"abandoned by client, "+
+		"swap ID: %v, %v",
+		s.hash, err)
+}
+
 // persistAndAnnounceState updates the swap state on disk and sends out an
 // update notification.
 func (s *loopInSwap) persistAndAnnounceState(ctx context.Context) error {

loopin_test.go

@@ -574,3 +574,205 @@ func testLoopInResume(t *testing.T, state loopdb.SwapState, expired bool,
 	cost.Server = btcutil.Amount(htlcTx.TxOut[0].Value) - amtPaid
 	require.Equal(t, cost, finalState.Cost)
 }
+
+// TestAbandonPublishedHtlcState advances a loop-in swap to StateHtlcPublished,
+// then abandons it and ensures that executing the same swap would not progress.
+func TestAbandonPublishedHtlcState(t *testing.T) {
+	defer test.Guard(t)()
+
+	ctx := newLoopInTestContext(t)
+
+	height := int32(600)
+
+	cfg, err, inSwap := startNewLoopIn(t, ctx, height)
+	require.NoError(t, err)
+
+	advanceToPublishedHtlc(t, ctx)
+
+	// The client requests to abandon the published htlc state.
+	inSwap.abandonChan <- struct{}{}
+
+	// Ensure that the swap is now in the StateFailAbandoned state.
+	ctx.assertState(loopdb.StateFailAbandoned)
+
+	// Ensure that the swap is also in the StateFailAbandoned state in the
+	// database.
+	ctx.store.assertLoopInState(loopdb.StateFailAbandoned)
+
+	// Ensure that the swap was abandoned and the execution stopped.
+	err = <-ctx.errChan
+	require.Error(t, err)
+	require.Contains(t, err.Error(), "swap hash abandoned by client")
+
+	// We re-instantiate the swap and ensure that it does not progress.
+	pendSwap := &loopdb.LoopIn{
+		Contract: &inSwap.LoopInContract,
+		Loop: loopdb.Loop{
+			Events: []*loopdb.LoopEvent{
+				{
+					SwapStateData: loopdb.SwapStateData{
+						State: inSwap.state,
+					},
+				},
+			},
+			Hash: testPreimage.Hash(),
+		},
+	}
+	resumedSwap, err := resumeLoopInSwap(
+		context.Background(), cfg, pendSwap,
+	)
+	require.NoError(t, err)
+
+	// Execute the abandoned swap.
+	go func() {
+		err := resumedSwap.execute(
+			context.Background(), ctx.cfg, height,
+		)
+		if err != nil {
+			log.Error(err)
+		}
+		ctx.errChan <- err
+	}()
+
+	// Ensure that the swap is still in the StateFailAbandoned state.
+	swapInfo := <-ctx.statusChan
+	require.Equal(t, loopdb.StateFailAbandoned, swapInfo.State)
+
+	// Ensure that the execution flagged the abandoned swap as finalized.
+	err = <-ctx.errChan
+	require.Error(t, err)
+	require.Equal(t, ErrSwapFinalized, err)
+}
+
+// TestAbandonSettledInvoiceState advances a loop-in swap to
+// StateInvoiceSettled, then abandons it and ensures that executing the same
+// swap would not progress.
+func TestAbandonSettledInvoiceState(t *testing.T) {
+	defer test.Guard(t)()
+
+	ctx := newLoopInTestContext(t)
+
+	height := int32(600)
+
+	cfg, err, inSwap := startNewLoopIn(t, ctx, height)
+	require.NoError(t, err)
+
+	advanceToPublishedHtlc(t, ctx)
+
+	// Client starts listening for swap invoice updates.
+	ctx.assertSubscribeInvoice(ctx.server.swapHash)
+
+	// Server has already paid invoice before spending the htlc. Signal
+	// settled.
+	ctx.updateInvoiceState(49000, invpkg.ContractSettled)
+
+	// Swap is expected to move to the state InvoiceSettled
+	ctx.assertState(loopdb.StateInvoiceSettled)
+	ctx.store.assertLoopInState(loopdb.StateInvoiceSettled)
+
+	// The client requests to abandon the published htlc state.
+	inSwap.abandonChan <- struct{}{}
+
+	// Ensure that the swap is now in the StateFailAbandoned state.
+	ctx.assertState(loopdb.StateFailAbandoned)
+
+	// Ensure that the swap is also in the StateFailAbandoned state in the
+	// database.
+	ctx.store.assertLoopInState(loopdb.StateFailAbandoned)
+
+	// Ensure that the swap was abandoned and the execution stopped.
+	err = <-ctx.errChan
+	require.Error(t, err)
+	require.Contains(t, err.Error(), "swap hash abandoned by client")
+
+	// We re-instantiate the swap and ensure that it does not progress.
+	pendSwap := &loopdb.LoopIn{
+		Contract: &inSwap.LoopInContract,
+		Loop: loopdb.Loop{
+			Events: []*loopdb.LoopEvent{
+				{
+					SwapStateData: loopdb.SwapStateData{
+						State: inSwap.state,
+					},
+				},
+			},
+			Hash: testPreimage.Hash(),
+		},
+	}
+	resumedSwap, err := resumeLoopInSwap(context.Background(), cfg, pendSwap)
+	require.NoError(t, err)
+
+	// Execute the abandoned swap.
+	go func() {
+		err := resumedSwap.execute(
+			context.Background(), ctx.cfg, height,
+		)
+		if err != nil {
+			log.Error(err)
+		}
+		ctx.errChan <- err
+	}()
+
+	// Ensure that the swap is still in the StateFailAbandoned state.
+	swapInfo := <-ctx.statusChan
+	require.Equal(t, loopdb.StateFailAbandoned, swapInfo.State)
+
+	// Ensure that the execution flagged the abandoned swap as finalized.
+	err = <-ctx.errChan
+	require.Error(t, err)
+	require.Equal(t, ErrSwapFinalized, err)
+}
+
+func advanceToPublishedHtlc(t *testing.T, ctx *loopInTestContext) SwapInfo {
+	swapInfo := <-ctx.statusChan
+	require.Equal(t, loopdb.StateInitiated, swapInfo.State)
+
+	ctx.assertState(loopdb.StateHtlcPublished)
+	ctx.store.assertLoopInState(loopdb.StateHtlcPublished)
+
+	// Expect htlc to be published.
+	htlcTx := <-ctx.lnd.SendOutputsChannel
+
+	// Expect the same state to be written again with the htlc tx hash
+	// and on chain fee.
+	ctx.store.assertLoopInState(loopdb.StateHtlcPublished)
+
+	// Expect register for htlc conf (only one, since the htlc is p2tr).
+	<-ctx.lnd.RegisterConfChannel
+
+	// Confirm htlc.
+	ctx.lnd.ConfChannel <- &chainntnfs.TxConfirmation{
+		Tx: &htlcTx,
+	}
+
+	// Client starts listening for spend of htlc.
+	<-ctx.lnd.RegisterSpendChannel
+	return swapInfo
+}
+
+func startNewLoopIn(t *testing.T, ctx *loopInTestContext, height int32) (
+	*swapConfig, error, *loopInSwap) {
+
+	cfg := newSwapConfig(&ctx.lnd.LndServices, ctx.store, ctx.server)
+
+	req := &testLoopInRequest
+
+	initResult, err := newLoopInSwap(
+		context.Background(), cfg,
+		height, req,
+	)
+	require.NoError(t, err)
+
+	inSwap := initResult.swap
+
+	ctx.store.assertLoopInStored()
+
+	go func() {
+		err := inSwap.execute(context.Background(), ctx.cfg, height)
+		if err != nil {
+			log.Error(err)
+		}
+		ctx.errChan <- err
+	}()
+	return cfg, err, inSwap
+}

loopin_testcontext_test.go

@@ -22,6 +22,7 @@ type loopInTestContext struct {
 	sweeper        *sweep.Sweeper
 	cfg            *executeConfig
 	statusChan     chan SwapInfo
+	errChan        chan error
 	blockEpochChan chan interface{}
 
 	swapInvoiceSubscription *test.SingleInvoiceSubscription
@@ -35,6 +36,7 @@ func newLoopInTestContext(t *testing.T) *loopInTestContext {
 
 	blockEpochChan := make(chan interface{})
 	statusChan := make(chan SwapInfo)
+	errChan := make(chan error)
 
 	expiryChan := make(chan time.Time)
 	timerFactory := func(expiry time.Duration) <-chan time.Time {
@@ -57,6 +59,7 @@ func newLoopInTestContext(t *testing.T) *loopInTestContext {
 		sweeper:        &sweeper,
 		cfg:            &cfg,
 		statusChan:     statusChan,
+		errChan:        errChan,
 		blockEpochChan: blockEpochChan,
 	}
 }

looprpc/client.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.31.0
 // 	protoc        v3.6.1
 // source: client.proto
 
@@ -234,6 +234,10 @@ const (
 	//FAILURE_REASON_INCORRECT_AMOUNT indicates that a loop in permanently failed
 	//because the amount extended by an external loop in htlc is insufficient.
 	FailureReason_FAILURE_REASON_INCORRECT_AMOUNT FailureReason = 6
+	//
+	//FAILURE_REASON_ABANDONED indicates that a swap permanently failed because
+	//the client manually abandoned the swap.
+	FailureReason_FAILURE_REASON_ABANDONED FailureReason = 7
 )
 
 // Enum value maps for FailureReason.
@@ -246,6 +250,7 @@ var (
 		4: "FAILURE_REASON_INSUFFICIENT_VALUE",
 		5: "FAILURE_REASON_TEMPORARY",
 		6: "FAILURE_REASON_INCORRECT_AMOUNT",
+		7: "FAILURE_REASON_ABANDONED",
 	}
 	FailureReason_value = map[string]int32{
 		"FAILURE_REASON_NONE":               0,
@@ -255,6 +260,7 @@ var (
 		"FAILURE_REASON_INSUFFICIENT_VALUE": 4,
 		"FAILURE_REASON_TEMPORARY":          5,
 		"FAILURE_REASON_INCORRECT_AMOUNT":   6,
+		"FAILURE_REASON_ABANDONED":          7,
 	}
 )
 
@@ -3132,6 +3138,106 @@ func (x *SuggestSwapsResponse) GetDisqualified() []*Disqualified {
 	return nil
 }
 
+type AbandonSwapRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	//
+	//The swap identifier which currently is the hash that locks the HTLCs. When
+	//using REST, this field must be encoded as URL safe base64.
+	Id []byte `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
+	//
+	//A flag that tries to ensure that the client understands that they are
+	//risking loss of funds by abandoning a swap. This could happen if an
+	//abandoned swap would wait on a timeout sweep by the client.
+	IKnowWhatIAmDoing bool `protobuf:"varint,2,opt,name=i_know_what_i_am_doing,json=iKnowWhatIAmDoing,proto3" json:"i_know_what_i_am_doing,omitempty"`
+}
+
+func (x *AbandonSwapRequest) Reset() {
+	*x = AbandonSwapRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_client_proto_msgTypes[30]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *AbandonSwapRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*AbandonSwapRequest) ProtoMessage() {}
+
+func (x *AbandonSwapRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_client_proto_msgTypes[30]
+	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 AbandonSwapRequest.ProtoReflect.Descriptor instead.
+func (*AbandonSwapRequest) Descriptor() ([]byte, []int) {
+	return file_client_proto_rawDescGZIP(), []int{30}
+}
+
+func (x *AbandonSwapRequest) GetId() []byte {
+	if x != nil {
+		return x.Id
+	}
+	return nil
+}
+
+func (x *AbandonSwapRequest) GetIKnowWhatIAmDoing() bool {
+	if x != nil {
+		return x.IKnowWhatIAmDoing
+	}
+	return false
+}
+
+type AbandonSwapResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *AbandonSwapResponse) Reset() {
+	*x = AbandonSwapResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_client_proto_msgTypes[31]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *AbandonSwapResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*AbandonSwapResponse) ProtoMessage() {}
+
+func (x *AbandonSwapResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_client_proto_msgTypes[31]
+	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 AbandonSwapResponse.ProtoReflect.Descriptor instead.
+func (*AbandonSwapResponse) Descriptor() ([]byte, []int) {
+	return file_client_proto_rawDescGZIP(), []int{31}
+}
+
 var File_client_proto protoreflect.FileDescriptor
 
 var file_client_proto_rawDesc = []byte{
@@ -3518,7 +3624,14 @@ var file_client_proto_rawDesc = []byte{
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@@ -3531,7 +3644,7 @@ var file_client_proto_rawDesc = []byte{
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@@ -3546,104 +3659,111 @@ var file_client_proto_rawDesc = []byte{
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-	0x61, 0x6d, 0x73, 0x12, 0x22, 0x2e, 0x6c, 0x6f, 0x6f, 0x70, 0x72, 0x70, 0x63, 0x2e, 0x53, 0x65,
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-	0x70, 0x72, 0x70, 0x63, 0x2e, 0x53, 0x75, 0x67, 0x67, 0x65, 0x73, 0x74, 0x53, 0x77, 0x61, 0x70,
-	0x73, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x42, 0x27, 0x5a, 0x25, 0x67, 0x69, 0x74,
-	0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x6c, 0x69, 0x67, 0x68, 0x74, 0x6e, 0x69, 0x6e,
-	0x67, 0x6c, 0x61, 0x62, 0x73, 0x2f, 0x6c, 0x6f, 0x6f, 0x70, 0x2f, 0x6c, 0x6f, 0x6f, 0x70, 0x72,
-	0x70, 0x63, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x23, 0x2e, 0x6c, 0x6f, 0x6f, 0x70, 0x72, 0x70, 0x63, 0x2e, 0x53, 0x65, 0x74, 0x4c, 0x69, 0x71,
+	0x75, 0x69, 0x64, 0x69, 0x74, 0x79, 0x50, 0x61, 0x72, 0x61, 0x6d, 0x73, 0x52, 0x65, 0x73, 0x70,
+	0x6f, 0x6e, 0x73, 0x65, 0x12, 0x4b, 0x0a, 0x0c, 0x53, 0x75, 0x67, 0x67, 0x65, 0x73, 0x74, 0x53,
+	0x77, 0x61, 0x70, 0x73, 0x12, 0x1c, 0x2e, 0x6c, 0x6f, 0x6f, 0x70, 0x72, 0x70, 0x63, 0x2e, 0x53,
+	0x75, 0x67, 0x67, 0x65, 0x73, 0x74, 0x53, 0x77, 0x61, 0x70, 0x73, 0x52, 0x65, 0x71, 0x75, 0x65,
+	0x73, 0x74, 0x1a, 0x1d, 0x2e, 0x6c, 0x6f, 0x6f, 0x70, 0x72, 0x70, 0x63, 0x2e, 0x53, 0x75, 0x67,
+	0x67, 0x65, 0x73, 0x74, 0x53, 0x77, 0x61, 0x70, 0x73, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73,
+	0x65, 0x42, 0x27, 0x5a, 0x25, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f,
+	0x6c, 0x69, 0x67, 0x68, 0x74, 0x6e, 0x69, 0x6e, 0x67, 0x6c, 0x61, 0x62, 0x73, 0x2f, 0x6c, 0x6f,
+	0x6f, 0x70, 0x2f, 0x6c, 0x6f, 0x6f, 0x70, 0x72, 0x70, 0x63, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x33,
 }
 
 var (
@@ -3659,7 +3779,7 @@ func file_client_proto_rawDescGZIP() []byte {
 }
 
 var file_client_proto_enumTypes = make([]protoimpl.EnumInfo, 6)
-var file_client_proto_msgTypes = make([]protoimpl.MessageInfo, 30)
+var file_client_proto_msgTypes = make([]protoimpl.MessageInfo, 32)
 var file_client_proto_goTypes = []interface{}{
 	(AddressType)(0),                   // 0: looprpc.AddressType
 	(SwapType)(0),                      // 1: looprpc.SwapType
@@ -3697,17 +3817,19 @@ var file_client_proto_goTypes = []interface{}{
 	(*SuggestSwapsRequest)(nil),        // 33: looprpc.SuggestSwapsRequest
 	(*Disqualified)(nil),               // 34: looprpc.Disqualified
 	(*SuggestSwapsResponse)(nil),       // 35: looprpc.SuggestSwapsResponse
-	(*swapserverrpc.RouteHint)(nil),    // 36: looprpc.RouteHint
+	(*AbandonSwapRequest)(nil),         // 36: looprpc.AbandonSwapRequest
+	(*AbandonSwapResponse)(nil),        // 37: looprpc.AbandonSwapResponse
+	(*swapserverrpc.RouteHint)(nil),    // 38: looprpc.RouteHint
 }
 var file_client_proto_depIdxs = []int32{
 	0,  // 0: looprpc.LoopOutRequest.account_addr_type:type_name -> looprpc.AddressType
-	36, // 1: looprpc.LoopInRequest.route_hints:type_name -> looprpc.RouteHint
+	38, // 1: looprpc.LoopInRequest.route_hints:type_name -> looprpc.RouteHint
 	1,  // 2: looprpc.SwapStatus.type:type_name -> looprpc.SwapType
 	2,  // 3: looprpc.SwapStatus.state:type_name -> looprpc.SwapState
 	3,  // 4: looprpc.SwapStatus.failure_reason:type_name -> looprpc.FailureReason
 	10, // 5: looprpc.ListSwapsResponse.swaps:type_name -> looprpc.SwapStatus
-	36, // 6: looprpc.QuoteRequest.loop_in_route_hints:type_name -> looprpc.RouteHint
-	36, // 7: looprpc.ProbeRequest.route_hints:type_name -> looprpc.RouteHint
+	38, // 6: looprpc.QuoteRequest.loop_in_route_hints:type_name -> looprpc.RouteHint
+	38, // 7: looprpc.ProbeRequest.route_hints:type_name -> looprpc.RouteHint
 	24, // 8: looprpc.TokensResponse.tokens:type_name -> looprpc.LsatToken
 	25, // 9: looprpc.GetInfoResponse.loop_out_stats:type_name -> looprpc.LoopStats
 	25, // 10: looprpc.GetInfoResponse.loop_in_stats:type_name -> looprpc.LoopStats
@@ -3725,33 +3847,35 @@ var file_client_proto_depIdxs = []int32{
 	9,  // 22: looprpc.SwapClient.Monitor:input_type -> looprpc.MonitorRequest
 	11, // 23: looprpc.SwapClient.ListSwaps:input_type -> looprpc.ListSwapsRequest
 	13, // 24: looprpc.SwapClient.SwapInfo:input_type -> looprpc.SwapInfoRequest
-	14, // 25: looprpc.SwapClient.LoopOutTerms:input_type -> looprpc.TermsRequest
-	17, // 26: looprpc.SwapClient.LoopOutQuote:input_type -> looprpc.QuoteRequest
-	14, // 27: looprpc.SwapClient.GetLoopInTerms:input_type -> looprpc.TermsRequest
-	17, // 28: looprpc.SwapClient.GetLoopInQuote:input_type -> looprpc.QuoteRequest
-	20, // 29: looprpc.SwapClient.Probe:input_type -> looprpc.ProbeRequest
-	22, // 30: looprpc.SwapClient.GetLsatTokens:input_type -> looprpc.TokensRequest
-	26, // 31: looprpc.SwapClient.GetInfo:input_type -> looprpc.GetInfoRequest
-	28, // 32: looprpc.SwapClient.GetLiquidityParams:input_type -> looprpc.GetLiquidityParamsRequest
-	31, // 33: looprpc.SwapClient.SetLiquidityParams:input_type -> looprpc.SetLiquidityParamsRequest
-	33, // 34: looprpc.SwapClient.SuggestSwaps:input_type -> looprpc.SuggestSwapsRequest
-	8,  // 35: looprpc.SwapClient.LoopOut:output_type -> looprpc.SwapResponse
-	8,  // 36: looprpc.SwapClient.LoopIn:output_type -> looprpc.SwapResponse
-	10, // 37: looprpc.SwapClient.Monitor:output_type -> looprpc.SwapStatus
-	12, // 38: looprpc.SwapClient.ListSwaps:output_type -> looprpc.ListSwapsResponse
-	10, // 39: looprpc.SwapClient.SwapInfo:output_type -> looprpc.SwapStatus
-	16, // 40: looprpc.SwapClient.LoopOutTerms:output_type -> looprpc.OutTermsResponse
-	19, // 41: looprpc.SwapClient.LoopOutQuote:output_type -> looprpc.OutQuoteResponse
-	15, // 42: looprpc.SwapClient.GetLoopInTerms:output_type -> looprpc.InTermsResponse
-	18, // 43: looprpc.SwapClient.GetLoopInQuote:output_type -> looprpc.InQuoteResponse
-	21, // 44: looprpc.SwapClient.Probe:output_type -> looprpc.ProbeResponse
-	23, // 45: looprpc.SwapClient.GetLsatTokens:output_type -> looprpc.TokensResponse
-	27, // 46: looprpc.SwapClient.GetInfo:output_type -> looprpc.GetInfoResponse
-	29, // 47: looprpc.SwapClient.GetLiquidityParams:output_type -> looprpc.LiquidityParameters
-	32, // 48: looprpc.SwapClient.SetLiquidityParams:output_type -> looprpc.SetLiquidityParamsResponse
-	35, // 49: looprpc.SwapClient.SuggestSwaps:output_type -> looprpc.SuggestSwapsResponse
-	35, // [35:50] is the sub-list for method output_type
-	20, // [20:35] is the sub-list for method input_type
+	36, // 25: looprpc.SwapClient.AbandonSwap:input_type -> looprpc.AbandonSwapRequest
+	14, // 26: looprpc.SwapClient.LoopOutTerms:input_type -> looprpc.TermsRequest
+	17, // 27: looprpc.SwapClient.LoopOutQuote:input_type -> looprpc.QuoteRequest
+	14, // 28: looprpc.SwapClient.GetLoopInTerms:input_type -> looprpc.TermsRequest
+	17, // 29: looprpc.SwapClient.GetLoopInQuote:input_type -> looprpc.QuoteRequest
+	20, // 30: looprpc.SwapClient.Probe:input_type -> looprpc.ProbeRequest
+	22, // 31: looprpc.SwapClient.GetLsatTokens:input_type -> looprpc.TokensRequest
+	26, // 32: looprpc.SwapClient.GetInfo:input_type -> looprpc.GetInfoRequest
+	28, // 33: looprpc.SwapClient.GetLiquidityParams:input_type -> looprpc.GetLiquidityParamsRequest
+	31, // 34: looprpc.SwapClient.SetLiquidityParams:input_type -> looprpc.SetLiquidityParamsRequest
+	33, // 35: looprpc.SwapClient.SuggestSwaps:input_type -> looprpc.SuggestSwapsRequest
+	8,  // 36: looprpc.SwapClient.LoopOut:output_type -> looprpc.SwapResponse
+	8,  // 37: looprpc.SwapClient.LoopIn:output_type -> looprpc.SwapResponse
+	10, // 38: looprpc.SwapClient.Monitor:output_type -> looprpc.SwapStatus
+	12, // 39: looprpc.SwapClient.ListSwaps:output_type -> looprpc.ListSwapsResponse
+	10, // 40: looprpc.SwapClient.SwapInfo:output_type -> looprpc.SwapStatus
+	37, // 41: looprpc.SwapClient.AbandonSwap:output_type -> looprpc.AbandonSwapResponse
+	16, // 42: looprpc.SwapClient.LoopOutTerms:output_type -> looprpc.OutTermsResponse
+	19, // 43: looprpc.SwapClient.LoopOutQuote:output_type -> looprpc.OutQuoteResponse
+	15, // 44: looprpc.SwapClient.GetLoopInTerms:output_type -> looprpc.InTermsResponse
+	18, // 45: looprpc.SwapClient.GetLoopInQuote:output_type -> looprpc.InQuoteResponse
+	21, // 46: looprpc.SwapClient.Probe:output_type -> looprpc.ProbeResponse
+	23, // 47: looprpc.SwapClient.GetLsatTokens:output_type -> looprpc.TokensResponse
+	27, // 48: looprpc.SwapClient.GetInfo:output_type -> looprpc.GetInfoResponse
+	29, // 49: looprpc.SwapClient.GetLiquidityParams:output_type -> looprpc.LiquidityParameters
+	32, // 50: looprpc.SwapClient.SetLiquidityParams:output_type -> looprpc.SetLiquidityParamsResponse
+	35, // 51: looprpc.SwapClient.SuggestSwaps:output_type -> looprpc.SuggestSwapsResponse
+	36, // [36:52] is the sub-list for method output_type
+	20, // [20:36] is the sub-list for method input_type
 	20, // [20:20] is the sub-list for extension type_name
 	20, // [20:20] is the sub-list for extension extendee
 	0,  // [0:20] is the sub-list for field type_name
@@ -4123,6 +4247,30 @@ func file_client_proto_init() {
 				return nil
 			}
 		}
+		file_client_proto_msgTypes[30].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*AbandonSwapRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_client_proto_msgTypes[31].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*AbandonSwapResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
 	}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
@@ -4130,7 +4278,7 @@ func file_client_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_client_proto_rawDesc,
 			NumEnums:      6,
-			NumMessages:   30,
+			NumMessages:   32,
 			NumExtensions: 0,
 			NumServices:   1,
 		},

looprpc/client.proto

@@ -43,6 +43,11 @@ service SwapClient {
     */
     rpc SwapInfo (SwapInfoRequest) returns (SwapStatus);
 
+    /* loop: `abandonswap`
+    AbandonSwap allows the client to abandon a swap.
+    */
+    rpc AbandonSwap (AbandonSwapRequest) returns (AbandonSwapResponse);
+
     /* loop: `terms`
     LoopOutTerms returns the terms that the server enforces for a loop out swap.
     */
@@ -524,6 +529,12 @@ enum FailureReason {
     because the amount extended by an external loop in htlc is insufficient.
     */
     FAILURE_REASON_INCORRECT_AMOUNT = 6;
+
+    /*
+    FAILURE_REASON_ABANDONED indicates that a swap permanently failed because
+    the client manually abandoned the swap.
+    */
+    FAILURE_REASON_ABANDONED = 7;
 }
 
 message ListSwapsRequest {
@@ -1180,3 +1191,21 @@ message SuggestSwapsResponse {
     */
     repeated Disqualified disqualified = 2;
 }
+
+message AbandonSwapRequest {
+    /*
+    The swap identifier which currently is the hash that locks the HTLCs. When
+    using REST, this field must be encoded as URL safe base64.
+    */
+    bytes id = 1;
+
+    /*
+    A flag that tries to ensure that the client understands that they are
+    risking loss of funds by abandoning a swap. This could happen if an
+    abandoned swap would wait on a timeout sweep by the client.
+     */
+    bool i_know_what_i_am_doing = 2;
+}
+
+message AbandonSwapResponse {
+}

looprpc/client.swagger.json

@@ -492,6 +492,9 @@
     }
   },
   "definitions": {
+    "looprpcAbandonSwapResponse": {
+      "type": "object"
+    },
     "looprpcAddressType": {
       "type": "string",
       "enum": [
@@ -551,10 +554,11 @@
         "FAILURE_REASON_SWEEP_TIMEOUT",
         "FAILURE_REASON_INSUFFICIENT_VALUE",
         "FAILURE_REASON_TEMPORARY",
-        "FAILURE_REASON_INCORRECT_AMOUNT"
+        "FAILURE_REASON_INCORRECT_AMOUNT",
+        "FAILURE_REASON_ABANDONED"
       ],
       "default": "FAILURE_REASON_NONE",
-      "description": " - FAILURE_REASON_NONE: FAILURE_REASON_NONE is set when the swap did not fail, it is either in\nprogress or succeeded.\n - FAILURE_REASON_OFFCHAIN: FAILURE_REASON_OFFCHAIN indicates that a loop out failed because it wasn't\npossible to find a route for one or both off chain payments that met the fee\nand timelock limits required.\n - FAILURE_REASON_TIMEOUT: FAILURE_REASON_TIMEOUT indicates that the swap failed because on chain htlc\ndid not confirm before its expiry, or it confirmed too late for us to reveal\nour preimage and claim.\n - FAILURE_REASON_SWEEP_TIMEOUT: FAILURE_REASON_SWEEP_TIMEOUT indicates that a loop out permanently failed\nbecause the on chain htlc wasn't swept before the server revoked the\nhtlc.\n - FAILURE_REASON_INSUFFICIENT_VALUE: FAILURE_REASON_INSUFFICIENT_VALUE indicates that a loop out has failed\nbecause the on chain htlc had a lower value than requested.\n - FAILURE_REASON_TEMPORARY: FAILURE_REASON_TEMPORARY indicates that a swap cannot continue due to an\ninternal error. Manual intervention such as a restart is required.\n - FAILURE_REASON_INCORRECT_AMOUNT: FAILURE_REASON_INCORRECT_AMOUNT indicates that a loop in permanently failed\nbecause the amount extended by an external loop in htlc is insufficient."
+      "description": " - FAILURE_REASON_NONE: FAILURE_REASON_NONE is set when the swap did not fail, it is either in\nprogress or succeeded.\n - FAILURE_REASON_OFFCHAIN: FAILURE_REASON_OFFCHAIN indicates that a loop out failed because it wasn't\npossible to find a route for one or both off chain payments that met the fee\nand timelock limits required.\n - FAILURE_REASON_TIMEOUT: FAILURE_REASON_TIMEOUT indicates that the swap failed because on chain htlc\ndid not confirm before its expiry, or it confirmed too late for us to reveal\nour preimage and claim.\n - FAILURE_REASON_SWEEP_TIMEOUT: FAILURE_REASON_SWEEP_TIMEOUT indicates that a loop out permanently failed\nbecause the on chain htlc wasn't swept before the server revoked the\nhtlc.\n - FAILURE_REASON_INSUFFICIENT_VALUE: FAILURE_REASON_INSUFFICIENT_VALUE indicates that a loop out has failed\nbecause the on chain htlc had a lower value than requested.\n - FAILURE_REASON_TEMPORARY: FAILURE_REASON_TEMPORARY indicates that a swap cannot continue due to an\ninternal error. Manual intervention such as a restart is required.\n - FAILURE_REASON_INCORRECT_AMOUNT: FAILURE_REASON_INCORRECT_AMOUNT indicates that a loop in permanently failed\nbecause the amount extended by an external loop in htlc is insufficient.\n - FAILURE_REASON_ABANDONED: FAILURE_REASON_ABANDONED indicates that a swap permanently failed because\nthe client manually abandoned the swap."
     },
     "looprpcGetInfoResponse": {
       "type": "object",

looprpc/client_grpc.pb.go

@@ -40,6 +40,9 @@ type SwapClientClient interface {
 	// loop: `swapinfo`
 	//SwapInfo returns all known details about a single swap.
 	SwapInfo(ctx context.Context, in *SwapInfoRequest, opts ...grpc.CallOption) (*SwapStatus, error)
+	// loop: `abandonswap`
+	//AbandonSwap allows the client to abandon a swap.
+	AbandonSwap(ctx context.Context, in *AbandonSwapRequest, opts ...grpc.CallOption) (*AbandonSwapResponse, error)
 	// loop: `terms`
 	//LoopOutTerms returns the terms that the server enforces for a loop out swap.
 	LoopOutTerms(ctx context.Context, in *TermsRequest, opts ...grpc.CallOption) (*OutTermsResponse, error)
@@ -158,6 +161,15 @@ func (c *swapClientClient) SwapInfo(ctx context.Context, in *SwapInfoRequest, op
 	return out, nil
 }
 
+func (c *swapClientClient) AbandonSwap(ctx context.Context, in *AbandonSwapRequest, opts ...grpc.CallOption) (*AbandonSwapResponse, error) {
+	out := new(AbandonSwapResponse)
+	err := c.cc.Invoke(ctx, "/looprpc.SwapClient/AbandonSwap", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 func (c *swapClientClient) LoopOutTerms(ctx context.Context, in *TermsRequest, opts ...grpc.CallOption) (*OutTermsResponse, error) {
 	out := new(OutTermsResponse)
 	err := c.cc.Invoke(ctx, "/looprpc.SwapClient/LoopOutTerms", in, out, opts...)
@@ -274,6 +286,9 @@ type SwapClientServer interface {
 	// loop: `swapinfo`
 	//SwapInfo returns all known details about a single swap.
 	SwapInfo(context.Context, *SwapInfoRequest) (*SwapStatus, error)
+	// loop: `abandonswap`
+	//AbandonSwap allows the client to abandon a swap.
+	AbandonSwap(context.Context, *AbandonSwapRequest) (*AbandonSwapResponse, error)
 	// loop: `terms`
 	//LoopOutTerms returns the terms that the server enforces for a loop out swap.
 	LoopOutTerms(context.Context, *TermsRequest) (*OutTermsResponse, error)
@@ -336,6 +351,9 @@ func (UnimplementedSwapClientServer) ListSwaps(context.Context, *ListSwapsReques
 func (UnimplementedSwapClientServer) SwapInfo(context.Context, *SwapInfoRequest) (*SwapStatus, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method SwapInfo not implemented")
 }
+func (UnimplementedSwapClientServer) AbandonSwap(context.Context, *AbandonSwapRequest) (*AbandonSwapResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method AbandonSwap not implemented")
+}
 func (UnimplementedSwapClientServer) LoopOutTerms(context.Context, *TermsRequest) (*OutTermsResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method LoopOutTerms not implemented")
 }
@@ -472,6 +490,24 @@ func _SwapClient_SwapInfo_Handler(srv interface{}, ctx context.Context, dec func
 	return interceptor(ctx, in, info, handler)
 }
 
+func _SwapClient_AbandonSwap_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(AbandonSwapRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(SwapClientServer).AbandonSwap(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/looprpc.SwapClient/AbandonSwap",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(SwapClientServer).AbandonSwap(ctx, req.(*AbandonSwapRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 func _SwapClient_LoopOutTerms_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(TermsRequest)
 	if err := dec(in); err != nil {
@@ -675,6 +711,10 @@ var SwapClient_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "SwapInfo",
 			Handler:    _SwapClient_SwapInfo_Handler,
 		},
+		{
+			MethodName: "AbandonSwap",
+			Handler:    _SwapClient_AbandonSwap_Handler,
+		},
 		{
 			MethodName: "LoopOutTerms",
 			Handler:    _SwapClient_LoopOutTerms_Handler,

looprpc/debug.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.31.0
 // 	protoc        v3.6.1
 // source: debug.proto
 

looprpc/swapclient.pb.json.go

@@ -163,6 +163,31 @@ func RegisterSwapClientJSONCallbacks(registry map[string]func(ctx context.Contex
 		callback(string(respBytes), nil)
 	}
 
+	registry["looprpc.SwapClient.AbandonSwap"] = func(ctx context.Context,
+		conn *grpc.ClientConn, reqJSON string, callback func(string, error)) {
+
+		req := &AbandonSwapRequest{}
+		err := marshaler.Unmarshal([]byte(reqJSON), req)
+		if err != nil {
+			callback("", err)
+			return
+		}
+
+		client := NewSwapClientClient(conn)
+		resp, err := client.AbandonSwap(ctx, req)
+		if err != nil {
+			callback("", err)
+			return
+		}
+
+		respBytes, err := marshaler.Marshal(resp)
+		if err != nil {
+			callback("", err)
+			return
+		}
+		callback(string(respBytes), nil)
+	}
+
 	registry["looprpc.SwapClient.LoopOutTerms"] = func(ctx context.Context,
 		conn *grpc.ClientConn, reqJSON string, callback func(string, error)) {
 

swap/type.go

@@ -11,6 +11,12 @@ const (
 	TypeOut
 )
 
+// IsOut returns true if the swap is a loop out swap, false if it is a loop in
+// swap.
+func (t Type) IsOut() bool {
+	return t == TypeOut
+}
+
 func (t Type) String() string {
 	switch t {
 	case TypeIn:

swapserverrpc/common.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.28.1
+// 	protoc-gen-go v1.30.0
 // 	protoc        v3.6.1
 // source: common.proto
 

swapserverrpc/server.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.28.1
+// 	protoc-gen-go v1.30.0
 // 	protoc        v3.6.1
 // source: server.proto
 
@@ -541,7 +541,7 @@ type ServerLoopOutResponse struct {
 	// The height at which the on-chain htlc will expire. Deprecated because the
 	// field is already specified in the request.
 	//
-	// Deprecated: Do not use.
+	// Deprecated: Marked as deprecated in server.proto.
 	Expiry int32 `protobuf:"varint,4,opt,name=expiry,proto3" json:"expiry,omitempty"`
 	// A human-readable message from the loop server.
 	ServerMessage string `protobuf:"bytes,5,opt,name=server_message,json=serverMessage,proto3" json:"server_message,omitempty"`
@@ -600,7 +600,7 @@ func (x *ServerLoopOutResponse) GetSenderKey() []byte {
 	return nil
 }
 
-// Deprecated: Do not use.
+// Deprecated: Marked as deprecated in server.proto.
 func (x *ServerLoopOutResponse) GetExpiry() int32 {
 	if x != nil {
 		return x.Expiry
@@ -717,17 +717,17 @@ type ServerLoopOutQuote struct {
 	SwapFee int64 `protobuf:"varint,2,opt,name=swap_fee,json=swapFee,proto3" json:"swap_fee,omitempty"`
 	/// Deprecated, total swap fee given quote amt is calculated in swap_fee.
 	//
-	// Deprecated: Do not use.
+	// Deprecated: Marked as deprecated in server.proto.
 	SwapFeeRate int64  `protobuf:"varint,3,opt,name=swap_fee_rate,json=swapFeeRate,proto3" json:"swap_fee_rate,omitempty"`
 	PrepayAmt   uint64 `protobuf:"varint,4,opt,name=prepay_amt,json=prepayAmt,proto3" json:"prepay_amt,omitempty"`
-	// Deprecated: Do not use.
+	// Deprecated: Marked as deprecated in server.proto.
 	MinSwapAmount uint64 `protobuf:"varint,5,opt,name=min_swap_amount,json=minSwapAmount,proto3" json:"min_swap_amount,omitempty"`
-	// Deprecated: Do not use.
+	// Deprecated: Marked as deprecated in server.proto.
 	MaxSwapAmount uint64 `protobuf:"varint,6,opt,name=max_swap_amount,json=maxSwapAmount,proto3" json:"max_swap_amount,omitempty"`
 	// The server-proposed cltv delta of the on-chain htlc. Deprecated because
 	// the field is already specified in the request.
 	//
-	// Deprecated: Do not use.
+	// Deprecated: Marked as deprecated in server.proto.
 	CltvDelta int32 `protobuf:"varint,7,opt,name=cltv_delta,json=cltvDelta,proto3" json:"cltv_delta,omitempty"`
 }
 
@@ -777,7 +777,7 @@ func (x *ServerLoopOutQuote) GetSwapFee() int64 {
 	return 0
 }
 
-// Deprecated: Do not use.
+// Deprecated: Marked as deprecated in server.proto.
 func (x *ServerLoopOutQuote) GetSwapFeeRate() int64 {
 	if x != nil {
 		return x.SwapFeeRate
@@ -792,7 +792,7 @@ func (x *ServerLoopOutQuote) GetPrepayAmt() uint64 {
 	return 0
 }
 
-// Deprecated: Do not use.
+// Deprecated: Marked as deprecated in server.proto.
 func (x *ServerLoopOutQuote) GetMinSwapAmount() uint64 {
 	if x != nil {
 		return x.MinSwapAmount
@@ -800,7 +800,7 @@ func (x *ServerLoopOutQuote) GetMinSwapAmount() uint64 {
 	return 0
 }
 
-// Deprecated: Do not use.
+// Deprecated: Marked as deprecated in server.proto.
 func (x *ServerLoopOutQuote) GetMaxSwapAmount() uint64 {
 	if x != nil {
 		return x.MaxSwapAmount
@@ -808,7 +808,7 @@ func (x *ServerLoopOutQuote) GetMaxSwapAmount() uint64 {
 	return 0
 }
 
-// Deprecated: Do not use.
+// Deprecated: Marked as deprecated in server.proto.
 func (x *ServerLoopOutQuote) GetCltvDelta() int32 {
 	if x != nil {
 		return x.CltvDelta
@@ -1249,11 +1249,11 @@ type ServerLoopInQuoteResponse struct {
 	unknownFields protoimpl.UnknownFields
 
 	SwapFee int64 `protobuf:"varint,1,opt,name=swap_fee,json=swapFee,proto3" json:"swap_fee,omitempty"`
-	// Deprecated: Do not use.
+	// Deprecated: Marked as deprecated in server.proto.
 	SwapFeeRate int64 `protobuf:"varint,2,opt,name=swap_fee_rate,json=swapFeeRate,proto3" json:"swap_fee_rate,omitempty"`
-	// Deprecated: Do not use.
+	// Deprecated: Marked as deprecated in server.proto.
 	MinSwapAmount uint64 `protobuf:"varint,4,opt,name=min_swap_amount,json=minSwapAmount,proto3" json:"min_swap_amount,omitempty"`
-	// Deprecated: Do not use.
+	// Deprecated: Marked as deprecated in server.proto.
 	MaxSwapAmount uint64 `protobuf:"varint,5,opt,name=max_swap_amount,json=maxSwapAmount,proto3" json:"max_swap_amount,omitempty"`
 	CltvDelta     int32  `protobuf:"varint,6,opt,name=cltv_delta,json=cltvDelta,proto3" json:"cltv_delta,omitempty"`
 }
@@ -1297,7 +1297,7 @@ func (x *ServerLoopInQuoteResponse) GetSwapFee() int64 {
 	return 0
 }
 
-// Deprecated: Do not use.
+// Deprecated: Marked as deprecated in server.proto.
 func (x *ServerLoopInQuoteResponse) GetSwapFeeRate() int64 {
 	if x != nil {
 		return x.SwapFeeRate
@@ -1305,7 +1305,7 @@ func (x *ServerLoopInQuoteResponse) GetSwapFeeRate() int64 {
 	return 0
 }
 
-// Deprecated: Do not use.
+// Deprecated: Marked as deprecated in server.proto.
 func (x *ServerLoopInQuoteResponse) GetMinSwapAmount() uint64 {
 	if x != nil {
 		return x.MinSwapAmount
@@ -1313,7 +1313,7 @@ func (x *ServerLoopInQuoteResponse) GetMinSwapAmount() uint64 {
 	return 0
 }
 
-// Deprecated: Do not use.
+// Deprecated: Marked as deprecated in server.proto.
 func (x *ServerLoopInQuoteResponse) GetMaxSwapAmount() uint64 {
 	if x != nil {
 		return x.MaxSwapAmount

testcontext_test.go

@@ -125,10 +125,7 @@ func createClientTestContext(t *testing.T,
 	ctx.stop = stop
 
 	go func() {
-		err := swapClient.Run(
-			runCtx,
-			statusChan,
-		)
+		err := swapClient.Run(runCtx, statusChan)
 		log.Errorf("client run: %v", err)
 		ctx.runErr <- err
 	}()