loopout: can set exact amount

This was proposed here: https://github.com/lightninglabs/loop/issues/234#issuecomment-644417843

client.go

@@ -458,14 +458,24 @@ func (s *Client) LoopOutQuote(ctx context.Context,
 		return nil, err
 	}
 
-	minerFee, err := s.sweeper.GetSweepFee(
+	var changeAddr btcutil.Address
+	if request.WithChange {
+		changeAddr = p2wshAddress
+	}
+
+	minerFeeOnlyDest, _, minerFeeBoth, err := s.sweeper.GetSweepFee(
 		ctx, swap.QuoteHtlc.AddSuccessToEstimator,
-		p2wshAddress, request.SweepConfTarget,
+		p2wshAddress, changeAddr, request.SweepConfTarget,
 	)
 	if err != nil {
 		return nil, err
 	}
 
+	minerFee := minerFeeOnlyDest
+	if request.WithChange {
+		minerFee = minerFeeBoth
+	}
+
 	return &LoopOutQuote{
 		SwapFee:         swapFee,
 		MinerFee:        minerFee,

cmd/loop/loopout.go

@@ -43,6 +43,18 @@ var loopOutCommand = cli.Command{
 			Name:  "amt",
 			Usage: "the amount in satoshis to loop out",
 		},
+		cli.Uint64Flag{
+			Name: "dest_amt",
+			Usage: "the optional exact amount in satoshis to send to " +
+				"'addr'; useful to pay to merchants; note that " +
+				"amt >= max_miner_fee + dest_amt",
+		},
+		cli.StringFlag{
+			Name: "change_addr",
+			Usage: "the optional address where to send change in case " +
+				"'dest_amt' is specified; if left empty and 'dest_amt' " +
+				"is provided, the funds will go to lnd's wallet",
+		},
 		cli.Uint64Flag{
 			Name: "htlc_confs",
 			Usage: "the number of of confirmations, in blocks " +
@@ -128,6 +140,19 @@ func loopOut(ctx *cli.Context) error {
 		destAddr = args.First()
 	}
 
+	var destAmount btcutil.Amount
+	if ctx.IsSet("dest_amt") {
+		destAmount, err = parseAmt(ctx.String("dest_amt"))
+		if err != nil {
+			return err
+		}
+	}
+
+	var changeAddr string
+	if ctx.IsSet("change_addr") {
+		changeAddr = ctx.String("change_addr")
+	}
+
 	client, cleanup, err := getClient(ctx)
 	if err != nil {
 		return err
@@ -152,6 +177,7 @@ func loopOut(ctx *cli.Context) error {
 		Amt:                     int64(amt),
 		ConfTarget:              sweepConfTarget,
 		SwapPublicationDeadline: uint64(swapDeadline.Unix()),
+		WithChange:              changeAddr != "",
 	}
 	quote, err := client.LoopOutQuote(context.Background(), quoteReq)
 	if err != nil {
@@ -185,6 +211,8 @@ func loopOut(ctx *cli.Context) error {
 	resp, err := client.LoopOut(context.Background(), &looprpc.LoopOutRequest{
 		Amt:                     int64(amt),
 		Dest:                    destAddr,
+		DestAmount:              int64(destAmount),
+		ChangeAddr:              changeAddr,
 		MaxMinerFee:             int64(limits.maxMinerFee),
 		MaxPrepayAmt:            int64(limits.maxPrepayAmt),
 		MaxSwapFee:              int64(limits.maxSwapFee),

cmd/loop/quote.go

@@ -76,6 +76,11 @@ var quoteOutCommand = cli.Command{
 	ArgsUsage:   "amt",
 	Description: "Allows to determine the cost of a swap up front",
 	Flags: []cli.Flag{
+		cli.BoolFlag{
+			Name: "with_change",
+			Usage: "Indicate you want to add change output; " +
+				"this is needed when making exact amount payment",
+		},
 		cli.Uint64Flag{
 			Name: "conf_target",
 			Usage: "the number of blocks from the swap " +
@@ -124,6 +129,7 @@ func quoteOut(ctx *cli.Context) error {
 	ctxb := context.Background()
 	quoteReq := &looprpc.QuoteRequest{
 		Amt:                     int64(amt),
+		WithChange:              ctx.Bool("with_change"),
 		ConfTarget:              int32(ctx.Uint64("conf_target")),
 		SwapPublicationDeadline: uint64(swapDeadline.Unix()),
 	}

interface.go

@@ -19,6 +19,17 @@ type OutRequest struct {
 	// Destination address for the swap.
 	DestAddr btcutil.Address
 
+	// DestAmount specifies the exact amount to send to DestAddr. If this
+	// field is enabled, ChangeAddr must also be specified. If it fails to
+	// send exactly DestAmount to DestAddr due to fees increase, it sends
+	// everything to ChangeAddr. Otherwise only the change goes to ChangeAddr.
+	// This is useful when a merchant asks you to pay exactly X to address.
+	DestAmount btcutil.Amount
+
+	// Where to send change in case DestAmount is specified. See description
+	// of DestAmount.
+	ChangeAddr btcutil.Address
+
 	// MaxSwapRoutingFee is the maximum off-chain fee in msat that may be
 	// paid for payment to the server. This limit is applied during path
 	// finding. Typically this value is taken from the response of the
@@ -111,6 +122,11 @@ type LoopOutQuoteRequest struct {
 	// include the swap and miner fee.
 	Amount btcutil.Amount
 
+	// WithChange specifies if change output is added to sweep tx.
+	// This is useful when a merchant asks you to pay exactly X to address.
+	// See the description of OutRequest.DestAmount.
+	WithChange bool
+
 	// SweepConfTarget specifies the targeted confirmation target for the
 	// client sweep tx.
 	SweepConfTarget int32

loopd/swapclient_server.go

@@ -81,6 +81,28 @@ func (s *swapClientServer) LoopOut(ctx context.Context,
 		}
 	}
 
+	var changeAddr btcutil.Address
+	if in.ChangeAddr != "" {
+		var err error
+		changeAddr, err = btcutil.DecodeAddress(
+			in.ChangeAddr, s.lnd.ChainParams,
+		)
+		if err != nil {
+			return nil, fmt.Errorf("decode change address: %v", err)
+		}
+	} else if in.DestAmount != 0 {
+		// Generate change address.
+		var err error
+		changeAddr, err = s.lnd.WalletKit.NextAddr(context.Background())
+		if err != nil {
+			return nil, fmt.Errorf("NextAddr error: %v", err)
+		}
+	}
+
+	if in.DestAmount != 0 && in.Amt < in.DestAmount+in.MaxMinerFee {
+		return nil, fmt.Errorf("amt is too small; the following rule is not satisfied: amt >= max_miner_fee + dest_amt; got values: amt=%d, max_miner_fee=%d, dest_amt=%d", in.Amt, in.DestAmount, in.MaxMinerFee)
+	}
+
 	// Check that the label is valid.
 	if err := labels.Validate(in.Label); err != nil {
 		return nil, err
@@ -89,6 +111,8 @@ func (s *swapClientServer) LoopOut(ctx context.Context,
 	req := &loop.OutRequest{
 		Amount:              btcutil.Amount(in.Amt),
 		DestAddr:            sweepAddr,
+		DestAmount:          btcutil.Amount(in.DestAmount),
+		ChangeAddr:          changeAddr,
 		MaxMinerFee:         btcutil.Amount(in.MaxMinerFee),
 		MaxPrepayAmount:     btcutil.Amount(in.MaxPrepayAmt),
 		MaxPrepayRoutingFee: btcutil.Amount(in.MaxPrepayRoutingFee),
@@ -410,6 +434,7 @@ func (s *swapClientServer) LoopOutQuote(ctx context.Context,
 	}
 	quote, err := s.impl.LoopOutQuote(ctx, &loop.LoopOutQuoteRequest{
 		Amount:          btcutil.Amount(req.Amt),
+		WithChange:      req.WithChange,
 		SweepConfTarget: confTarget,
 		SwapPublicationDeadline: time.Unix(
 			int64(req.SwapPublicationDeadline), 0,

loopdb/loopout.go

@@ -24,6 +24,14 @@ type LoopOutContract struct {
 	// DestAddr is the destination address of the loop out swap.
 	DestAddr btcutil.Address
 
+	// DestAmount specifies the exact amount to send to DestAddr. Optional.
+	// Used together with ChangeAddr.
+	DestAmount btcutil.Amount
+
+	// Where to send change in case DestAmount is specified. Optional.
+	// Used together with DestAmount.
+	ChangeAddr btcutil.Address
+
 	// SwapInvoice is the invoice that is to be paid by the client to
 	// initiate the loop out swap.
 	SwapInvoice string
@@ -205,6 +213,21 @@ func deserializeLoopOutContract(value []byte, chainParams *chaincfg.Params) (
 	}
 	contract.SwapPublicationDeadline = time.Unix(0, deadlineNano)
 
+	if err := binary.Read(r, byteOrder, &contract.DestAmount); err != nil {
+		return nil, err
+	}
+
+	addr, err = wire.ReadVarString(r, 0)
+	if err != nil {
+		return nil, err
+	}
+	if addr != "" {
+		contract.ChangeAddr, err = btcutil.DecodeAddress(addr, chainParams)
+		if err != nil {
+			return nil, err
+		}
+	}
+
 	return &contract, nil
 }
 
@@ -294,5 +317,16 @@ func serializeLoopOutContract(swap *LoopOutContract) (
 		return nil, err
 	}
 
+	if err := binary.Write(&b, byteOrder, swap.DestAmount); err != nil {
+		return nil, err
+	}
+	var addressStr string
+	if swap.ChangeAddr != nil {
+		addressStr = swap.ChangeAddr.String()
+	}
+	if err := wire.WriteVarString(&b, 0, addressStr); err != nil {
+		return nil, err
+	}
+
 	return b.Bytes(), nil
 }

loopdb/meta.go

@@ -37,6 +37,7 @@ var (
 		migrateSwapPublicationDeadline,
 		migrateLastHop,
 		migrateUpdates,
+		migrateExactAmount,
 	}
 
 	latestDBVersion = uint32(len(migrations))

loopdb/migration_05_exact_amount.go

@@ -0,0 +1,69 @@
+package loopdb
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"fmt"
+
+	"github.com/btcsuite/btcd/chaincfg"
+	"github.com/btcsuite/btcd/wire"
+	"github.com/btcsuite/btcutil"
+	"github.com/coreos/bbolt"
+)
+
+// migrateExactAmount migrates the loop out contracts to new format, having
+// two new fields in the end: DestAmount and ChangeAddr.
+func migrateExactAmount(tx *bbolt.Tx, chainParams *chaincfg.Params) error {
+	// Prepare suffix.
+	var b bytes.Buffer
+	var amount btcutil.Amount
+	if err := binary.Write(&b, byteOrder, amount); err != nil {
+		return err
+	}
+	if err := wire.WriteVarString(&b, 0, ""); err != nil {
+		return err
+	}
+	suffix := b.Bytes()
+
+	// Make the list of buckets.
+	rootBucket := tx.Bucket(loopOutBucketKey)
+	if rootBucket == nil {
+		return fmt.Errorf("bucket %v does not exist", loopOutBucketKey)
+	}
+
+	var swaps [][]byte
+	// Do not modify inside the for each.
+	err := rootBucket.ForEach(func(swapHash, v []byte) error {
+		// Only go into things that we know are sub-bucket keys.
+		if rootBucket.Bucket(swapHash) != nil {
+			swaps = append(swaps, swapHash)
+		}
+
+		return nil
+	})
+	if err != nil {
+		return err
+	}
+
+	// With the swaps listed, migrate them one by one.
+	for _, swapHash := range swaps {
+		swapBucket := rootBucket.Bucket(swapHash)
+		if swapBucket == nil {
+			return fmt.Errorf("swap bucket %x not found", swapHash)
+		}
+
+		contractBytes := swapBucket.Get(contractKey)
+		if contractBytes == nil {
+			return errors.New("contract not found")
+		}
+
+		contractBytes = append(contractBytes, suffix...)
+
+		if err := swapBucket.Put(contractKey, contractBytes); err != nil {
+			return fmt.Errorf("failed to save the updated contract for %x: %v", swapHash, err)
+		}
+	}
+
+	return nil
+}

loopdb/migration_05_exact_amount_test.go

@@ -0,0 +1,65 @@
+package loopdb
+
+import (
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/btcsuite/btcd/chaincfg"
+	"github.com/coreos/bbolt"
+	"github.com/stretchr/testify/require"
+)
+
+func TestMigrationExactAmount(t *testing.T) {
+	var (
+		legacyDbVersion = Hex("00000004")
+	)
+
+	legacyDb := map[string]interface{}{
+		"metadata": map[string]interface{}{
+			"dbp": legacyDbVersion,
+		},
+		"uncharge-swaps": map[string]interface{}{
+			Hex("c3b3d7a145dbd2bab5aa1f505305f31ee432fe23b0801f065fac453dd9b1f923"): map[string]interface{}{
+				"contract":          Hex("161b2526643767387ca76e58c964a8f2b6c0a13392b2dea93bde260226a263fb836954054ed1756b000000000000c350fd11016c6e6263727431333337306e3170303072343775707035366c7671663836753565766135647868686c706c78303733756a70676e3979767977376130766a37746d307678793276683576716471327770657832757270307963717a7279787139377a76757173703570373232733970686a6e6e6e706c3778716e796a78353373706863346c396735306b396e347836703761793577707539306b6673397179397173717a353766676a7a67676838343439377375716b383436787a3333336a713036736c6b38637a323872657466363672796b7876396a746e6a3072683979666a6170777065617265713071396679797a666664676d6874687973617370757565746e6b72306b32376370326173366a750269d66fd2cea620dc06f1f7de7838f0c8b145b82c7033080c398862f3421a23230382cb637badbb07f9926a06ecd88b6150513ea0060dc8d6dc1c1fb623926b0a0f000077d400000000000b458c00000000000005f10000000000000024000077a22c6263727431713271756332666777737971376463617a73666e3332636a7874667671647671366a6c70706574fd0f016c6e626372743530313834306e317030307234377570703563776561306732396d30667434646432726167397870306e726d6a72396c33726b7a717037706a6c34337a6e6d6b64336c79337364713877646d6b7a757163717a7279787139377a767571737035616478717538766168643730743776747165777578366d6d64337977636639767835736476717567753833327230676e373466733971793971737168746773636638386e377664767136716e71307a657775366d7471616e326c7a306e7534737a72376c6b36646d343673336c78726572656e333972616b7a6c777378346c613538733966773630356d6767766b766879716e743339713976737367777879367571707236713273780000000600000000000003f20000000000000000161b25262710ce00"),
+				"outgoing-chan-set": nil,
+				"updates": map[string]interface{}{
+					Hex("0000000000000001"): map[string]interface{}{
+						string([]byte{0}): Hex("161b252a770e649b01000000000000053900000000000000000000000000000001"),
+					},
+					Hex("0000000000000002"): map[string]interface{}{
+						string([]byte{0}): Hex("161b252ab671bdd90200000000000005f10000000000001a9c0000000000000003"),
+					},
+				},
+			},
+		},
+	}
+
+	// Restore a legacy database.
+	tempDirName, err := ioutil.TempDir("", "clientstore")
+	require.NoError(t, err)
+	defer os.RemoveAll(tempDirName)
+
+	tempPath := filepath.Join(tempDirName, dbFileName)
+	db, err := bbolt.Open(tempPath, 0600, nil)
+	require.NoError(t, err)
+
+	err = db.Update(func(tx *bbolt.Tx) error {
+		return RestoreDB(tx, legacyDb)
+	})
+
+	// Close database regardless of update result.
+	db.Close()
+
+	// Assert update was successful.
+	require.NoError(t, err)
+
+	// Open db and migrate to the latest version.
+	store, err := NewBoltSwapStore(tempDirName, &chaincfg.MainNetParams)
+	require.NoError(t, err)
+
+	// Fetch the legacy loop out swap.
+	_, err = store.FetchLoopOutSwaps()
+	require.NoError(t, err)
+}

loopin.go

@@ -849,8 +849,8 @@ func (s *loopInSwap) publishTimeoutTx(ctx context.Context,
 	}
 
 	// Calculate sweep tx fee
-	fee, err := s.sweeper.GetSweepFee(
-		ctx, s.htlc.AddTimeoutToEstimator, s.timeoutAddr,
+	fee, _, _, err := s.sweeper.GetSweepFee(
+		ctx, s.htlc.AddTimeoutToEstimator, s.timeoutAddr, nil,
 		TimeoutTxConfTarget,
 	)
 	if err != nil {
@@ -864,7 +864,7 @@ func (s *loopInSwap) publishTimeoutTx(ctx context.Context,
 	sequence := uint32(0)
 	timeoutTx, err := s.sweeper.CreateSweepTx(
 		ctx, s.height, sequence, s.htlc, *htlcOutpoint, s.SenderKey,
-		witnessFunc, htlcValue, fee, s.timeoutAddr,
+		witnessFunc, htlcValue, 0, fee, 0, 0, s.timeoutAddr, nil, s.log.Warnf,
 	)
 	if err != nil {
 		return err

loopout.go

@@ -149,6 +149,8 @@ func newLoopOutSwap(globalCtx context.Context, cfg *swapConfig,
 	contract := loopdb.LoopOutContract{
 		SwapInvoice:             swapResp.swapInvoice,
 		DestAddr:                request.DestAddr,
+		DestAmount:              request.DestAmount,
+		ChangeAddr:              request.ChangeAddr,
 		MaxSwapRoutingFee:       request.MaxSwapRoutingFee,
 		SweepConfTarget:         request.SweepConfTarget,
 		HtlcConfirmations:       confs,
@@ -910,23 +912,27 @@ func (s *loopOutSwap) sweep(ctx context.Context,
 		confTarget > DefaultSweepConfTarget {
 		confTarget = DefaultSweepConfTarget
 	}
-	fee, err := s.sweeper.GetSweepFee(
-		ctx, s.htlc.AddSuccessToEstimator, s.DestAddr, confTarget,
+
+	feeOnlyDest, feeOnlyChange, feeBoth, err := s.sweeper.GetSweepFee(
+		ctx, s.htlc.AddSuccessToEstimator, s.DestAddr, s.ChangeAddr, confTarget,
 	)
 	if err != nil {
 		return err
 	}
 
 	// Ensure it doesn't exceed our maximum fee allowed.
-	if fee > s.MaxMinerFee {
+	for _, fee := range []*btcutil.Amount{&feeOnlyDest, &feeOnlyChange, &feeBoth} {
+		if *fee == 0 || *fee <= s.MaxMinerFee {
+			continue
+		}
 		s.log.Warnf("Required fee %v exceeds max miner fee of %v",
-			fee, s.MaxMinerFee)
+			*fee, s.MaxMinerFee)
 
 		if s.state == loopdb.StatePreimageRevealed {
 			// The currently required fee exceeds the max, but we
 			// already revealed the preimage. The best we can do now
 			// is to republish with the max fee.
-			fee = s.MaxMinerFee
+			*fee = s.MaxMinerFee
 		} else {
 			s.log.Warnf("Not revealing preimage")
 			return nil
@@ -936,7 +942,10 @@ func (s *loopOutSwap) sweep(ctx context.Context,
 	// Create sweep tx.
 	sweepTx, err := s.sweeper.CreateSweepTx(
 		ctx, s.height, s.htlc.SuccessSequence(), s.htlc, htlcOutpoint,
-		s.ReceiverKey, witnessFunc, htlcValue, fee, s.DestAddr,
+		s.ReceiverKey, witnessFunc, htlcValue, s.DestAmount,
+		feeOnlyDest, feeOnlyChange, feeBoth,
+		s.DestAddr, s.ChangeAddr,
+		s.log.Warnf,
 	)
 	if err != nil {
 		return err
@@ -955,6 +964,11 @@ func (s *loopOutSwap) sweep(ctx context.Context,
 	}
 
 	// Publish tx.
+	var sumOutputs int64
+	for _, txout := range sweepTx.TxOut {
+		sumOutputs += txout.Value
+	}
+	fee := htlcValue - btcutil.Amount(sumOutputs)
 	s.log.Infof("Sweep on chain HTLC to address %v with fee %v (tx %v)",
 		s.DestAddr, fee, sweepTx.TxHash())
 
@@ -975,6 +989,10 @@ func validateLoopOutContract(lnd *lndclient.LndServices,
 	height int32, request *OutRequest, swapHash lntypes.Hash,
 	response *newLoopOutResponse) error {
 
+	if (request.DestAmount != 0) != (request.ChangeAddr != nil) {
+		return fmt.Errorf("provide either both DestAmount and ChangeAddr or none of them")
+	}
+
 	// Check invoice amounts.
 	chainParams := lnd.ChainParams
 

looprpc/client.pb.go

@@ -208,6 +208,12 @@ type LoopOutRequest struct {
 	//Base58 encoded destination address for the swap.
 	Dest string `protobuf:"bytes,2,opt,name=dest,proto3" json:"dest,omitempty"`
 	//
+	//Exact amount in satoshis to send to 'dest'. Optional.
+	DestAmount int64 `protobuf:"varint,15,opt,name=dest_amount,json=destAmount,proto3" json:"dest_amount,omitempty"`
+	//
+	//Base58 encoded change address for the swap.
+	ChangeAddr string `protobuf:"bytes,16,opt,name=change_addr,json=changeAddr,proto3" json:"change_addr,omitempty"`
+	//
 	//Maximum off-chain fee in sat that may be paid for swap payment to the server.
 	//This limit is applied during path finding. Typically this value is taken
 	//from the response of the GetQuote call.
@@ -323,6 +329,20 @@ func (m *LoopOutRequest) GetDest() string {
 	return ""
 }
 
+func (m *LoopOutRequest) GetDestAmount() int64 {
+	if m != nil {
+		return m.DestAmount
+	}
+	return 0
+}
+
+func (m *LoopOutRequest) GetChangeAddr() string {
+	if m != nil {
+		return m.ChangeAddr
+	}
+	return ""
+}
+
 func (m *LoopOutRequest) GetMaxSwapRoutingFee() int64 {
 	if m != nil {
 		return m.MaxSwapRoutingFee
@@ -1128,6 +1148,9 @@ type QuoteRequest struct {
 	//The amount to swap in satoshis.
 	Amt int64 `protobuf:"varint,1,opt,name=amt,proto3" json:"amt,omitempty"`
 	//
+	//If change output will be added. This is needed to send exact amount.
+	WithChange bool `protobuf:"varint,5,opt,name=with_change,json=withChange,proto3" json:"with_change,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
@@ -1181,6 +1204,13 @@ func (m *QuoteRequest) GetAmt() int64 {
 	return 0
 }
 
+func (m *QuoteRequest) GetWithChange() bool {
+	if m != nil {
+		return m.WithChange
+	}
+	return false
+}
+
 func (m *QuoteRequest) GetConfTarget() int32 {
 	if m != nil {
 		return m.ConfTarget
@@ -2005,157 +2035,159 @@ func init() {
 func init() { proto.RegisterFile("client.proto", fileDescriptor_014de31d7ac8c57c) }
 
 var fileDescriptor_014de31d7ac8c57c = []byte{
-	// 2385 bytes of a gzipped FileDescriptorProto
+	// 2431 bytes of a gzipped FileDescriptorProto
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-	0xf5, 0x5f, 0x49, 0x94, 0x25, 0x3d, 0x51, 0x12, 0x3d, 0xde, 0xb5, 0x65, 0xc5, 0x41, 0xbc, 0x4c,
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+	0x71, 0x91, 0x1e, 0x33, 0x1a, 0xcc, 0x84, 0x75, 0x54, 0xa3, 0x1c, 0xd2, 0xce, 0x69, 0x30, 0x23,
+	0x1f, 0x82, 0x16, 0x41, 0x3c, 0x9f, 0x59, 0x36, 0xb6, 0x46, 0xd9, 0xc0, 0x6b, 0x21, 0x7d, 0x10,
+	0x92, 0xb1, 0x03, 0xc8, 0x2c, 0x34, 0x3d, 0x6a, 0x4d, 0x4c, 0x1b, 0xad, 0x28, 0x07, 0xda, 0xaa,
+	0xa4, 0x0f, 0xa8, 0x35, 0xb9, 0x0c, 0x28, 0x27, 0x9f, 0xc2, 0x93, 0xc4, 0xd4, 0x9b, 0x80, 0xcb,
+	0x34, 0x27, 0x7e, 0x3c, 0xf6, 0xc6, 0x47, 0x9e, 0x81, 0x8a, 0x2d, 0xc5, 0x1c, 0xfb, 0x8c, 0x72,
+	0x36, 0x09, 0x13, 0xbd, 0x8c, 0xb4, 0xb6, 0x24, 0x91, 0x3a, 0x14, 0xd8, 0xad, 0x67, 0xf9, 0x6c,
+	0x22, 0x5a, 0x4a, 0xd1, 0x88, 0x3e, 0xf1, 0x70, 0xc0, 0x5d, 0x9f, 0x4e, 0x99, 0xe9, 0x50, 0x9b,
+	0x85, 0x33, 0x4c, 0x39, 0xa4, 0xf5, 0xa8, 0xcd, 0xf4, 0x77, 0x60, 0xff, 0x2b, 0xc6, 0x2f, 0xac,
+	0xef, 0x16, 0xd6, 0xc4, 0xe2, 0x77, 0x03, 0xea, 0xd3, 0x65, 0x99, 0xfc, 0x97, 0x02, 0x3b, 0x69,
+	0x16, 0xe3, 0xcc, 0xc7, 0x16, 0x95, 0xf7, 0x17, 0x73, 0x16, 0x79, 0x67, 0xd9, 0x52, 0x63, 0xb0,
+	0xb1, 0x98, 0x33, 0x43, 0x82, 0xc8, 0x97, 0x70, 0xb0, 0x0c, 0x31, 0x1f, 0x9b, 0x64, 0x40, 0xb9,
+	0xe9, 0x31, 0xdf, 0x7c, 0x83, 0xa3, 0x80, 0xb0, 0xbe, 0xc8, 0x4a, 0x19, 0x6d, 0x06, 0xe5, 0x18,
+	0x71, 0x03, 0xe6, 0xbf, 0x46, 0x36, 0xf9, 0x00, 0xb4, 0xe4, 0x2c, 0x69, 0x7a, 0x9e, 0x2d, 0x3c,
+	0xa1, 0xc4, 0xe5, 0x0e, 0xed, 0xe5, 0xd9, 0xe4, 0x13, 0xc0, 0x05, 0xc2, 0x4c, 0x59, 0xd8, 0xb3,
+	0xc3, 0xa4, 0x47, 0x19, 0xcb, 0xad, 0x02, 0xe1, 0x9f, 0x43, 0x63, 0xfd, 0x36, 0x22, 0x4e, 0xe5,
+	0xc5, 0xa9, 0xdd, 0x35, 0x1b, 0x09, 0x9e, 0x4d, 0xaf, 0x1c, 0xe8, 0xc1, 0x2d, 0x81, 0x5f, 0xae,
+	0x1c, 0x98, 0x33, 0x1f, 0xc2, 0x76, 0x6a, 0xc6, 0x15, 0xc0, 0x82, 0x00, 0x56, 0x13, 0x73, 0x6e,
+	0x9c, 0x5e, 0xab, 0xfb, 0x41, 0x71, 0xfd, 0x7e, 0xf0, 0x02, 0x76, 0xa2, 0xc9, 0xe6, 0x9a, 0x8e,
+	0xbf, 0x75, 0x6f, 0x6e, 0xcc, 0x80, 0x8d, 0x45, 0xd5, 0x56, 0x8c, 0xed, 0x90, 0xf5, 0x52, 0x72,
+	0x86, 0x6c, 0x8c, 0xa3, 0x36, 0x5d, 0x70, 0xd7, 0x8c, 0x56, 0x1b, 0xd1, 0xae, 0x8b, 0x46, 0x19,
+	0x89, 0xe1, 0xea, 0x88, 0xb6, 0x13, 0x18, 0xdc, 0x7c, 0xae, 0x17, 0x93, 0x29, 0x93, 0x65, 0xa3,
+	0x2c, 0x6d, 0x87, 0xac, 0xfe, 0x82, 0xbf, 0x14, 0x0c, 0x7c, 0xee, 0x0f, 0x60, 0xff, 0x1e, 0x9c,
+	0x53, 0x9f, 0x8b, 0x87, 0xa8, 0xe2, 0xd0, 0x93, 0xf4, 0x21, 0xe4, 0xe2, 0x63, 0x3e, 0x02, 0x22,
+	0x4e, 0xa2, 0x61, 0x2c, 0xc7, 0xbc, 0x99, 0x5b, 0xd3, 0x19, 0x17, 0xe3, 0x8a, 0x62, 0xd4, 0x90,
+	0x73, 0x49, 0x6f, 0xbb, 0xce, 0x99, 0x20, 0xeb, 0x7f, 0xc8, 0x40, 0x25, 0x15, 0x52, 0xa2, 0xb4,
+	0xc8, 0xf5, 0xcb, 0x0c, 0x1b, 0xbc, 0x62, 0x94, 0x42, 0x4a, 0x77, 0x42, 0x5e, 0x84, 0x53, 0x64,
+	0x56, 0x8c, 0x7a, 0x8d, 0xf5, 0x71, 0x99, 0x18, 0x27, 0x3f, 0x01, 0x62, 0x39, 0x63, 0xd7, 0x46,
+	0xcf, 0xf3, 0x99, 0xcf, 0x82, 0x99, 0x3b, 0x9f, 0x88, 0xe8, 0xaa, 0x18, 0xdb, 0x11, 0x67, 0x14,
+	0x31, 0x10, 0x1e, 0x6f, 0x7c, 0x4b, 0xb8, 0x22, 0xe1, 0x11, 0x27, 0x86, 0xeb, 0xdf, 0xc0, 0xfe,
+	0x70, 0x53, 0x6e, 0x91, 0x2f, 0x00, 0xbc, 0x38, 0xa3, 0x84, 0x26, 0xe5, 0x93, 0x83, 0xfb, 0x0f,
+	0x5e, 0x66, 0x9d, 0x91, 0xc0, 0xeb, 0x07, 0xd0, 0x58, 0x27, 0x5a, 0x96, 0x4f, 0xfd, 0x09, 0xec,
+	0x0c, 0x17, 0xd3, 0x29, 0x5b, 0x19, 0xb4, 0x5e, 0xc1, 0xe3, 0x34, 0x39, 0xac, 0xb6, 0x27, 0x50,
+	0x8c, 0x63, 0x43, 0x66, 0xf4, 0xde, 0xf2, 0x21, 0xa9, 0xdf, 0x16, 0x8c, 0x42, 0xb8, 0x03, 0x1f,
+	0x3f, 0x87, 0x62, 0x34, 0x9a, 0x13, 0x15, 0x8a, 0x17, 0xfd, 0xfe, 0xc0, 0xec, 0x5f, 0x8d, 0xb4,
+	0x47, 0xa4, 0x0c, 0x05, 0xf1, 0xd5, 0xed, 0x69, 0x99, 0xe3, 0x00, 0x4a, 0xf1, 0x64, 0x4e, 0x2a,
+	0x50, 0xea, 0xf6, 0xba, 0xa3, 0x6e, 0x6b, 0xd4, 0x39, 0xd5, 0x1e, 0x91, 0x27, 0xb0, 0x3d, 0x30,
+	0x3a, 0xdd, 0xcb, 0xd6, 0x57, 0x1d, 0xd3, 0xe8, 0xbc, 0xee, 0xb4, 0x2e, 0x3a, 0xa7, 0x5a, 0x86,
+	0x10, 0xa8, 0x9e, 0x8f, 0x2e, 0xda, 0xe6, 0xe0, 0xea, 0xe5, 0x45, 0x77, 0x78, 0xde, 0x39, 0xd5,
+	0xb2, 0x28, 0x73, 0x78, 0xd5, 0x6e, 0x77, 0x86, 0x43, 0x2d, 0x47, 0x00, 0xb6, 0xce, 0x5a, 0x5d,
+	0x04, 0x2b, 0x64, 0x07, 0x6a, 0xdd, 0xde, 0xeb, 0x7e, 0xb7, 0xdd, 0x31, 0x87, 0x9d, 0xd1, 0x08,
+	0x89, 0xf9, 0xe3, 0x7f, 0x64, 0xa0, 0x92, 0x1a, 0xee, 0xc9, 0x1e, 0xec, 0xe0, 0x91, 0x2b, 0x03,
+	0x6f, 0x6a, 0x0d, 0xfb, 0x3d, 0xb3, 0xd7, 0xef, 0x75, 0xb4, 0x47, 0xe4, 0x1d, 0xd8, 0x5b, 0x61,
+	0xf4, 0xcf, 0xce, 0xda, 0xe7, 0x2d, 0x7c, 0x3c, 0x69, 0xc0, 0xee, 0x0a, 0x73, 0xd4, 0xbd, 0xec,
+	0xa0, 0x96, 0x59, 0x72, 0x08, 0x07, 0x2b, 0xbc, 0xe1, 0xd7, 0x9d, 0xce, 0x20, 0x46, 0xe4, 0xc8,
+	0x73, 0x78, 0xb6, 0x82, 0xe8, 0xf6, 0x86, 0x57, 0x67, 0x67, 0xdd, 0x76, 0xb7, 0xd3, 0x1b, 0x99,
+	0xaf, 0x5b, 0x17, 0x57, 0x1d, 0x4d, 0x21, 0x07, 0x50, 0x5f, 0xbd, 0xa4, 0x73, 0x39, 0xe8, 0x1b,
+	0x2d, 0xe3, 0x1b, 0x2d, 0x4f, 0xde, 0x83, 0xa7, 0xf7, 0x84, 0xb4, 0xfb, 0x86, 0xd1, 0x69, 0x8f,
+	0xcc, 0xd6, 0x65, 0xff, 0xaa, 0x37, 0xd2, 0xb6, 0x8e, 0x9b, 0x38, 0x40, 0xaf, 0x04, 0x38, 0x9a,
+	0xec, 0xaa, 0xf7, 0xe3, 0x5e, 0xff, 0xeb, 0x9e, 0xf6, 0x08, 0x2d, 0x3f, 0x3a, 0x37, 0x3a, 0xc3,
+	0xf3, 0xfe, 0xc5, 0xa9, 0x96, 0x39, 0xf9, 0x6b, 0x49, 0x2e, 0x6f, 0x6d, 0xf1, 0x83, 0x13, 0x31,
+	0xa0, 0x10, 0xd5, 0x81, 0x4d, 0x8e, 0x6f, 0x3c, 0x49, 0x0d, 0xe0, 0x71, 0xa4, 0xed, 0xfd, 0xea,
+	0x2f, 0x7f, 0xfb, 0x6d, 0x76, 0x5b, 0x57, 0x9b, 0x6f, 0x3e, 0x6d, 0x22, 0xa2, 0xe9, 0x2e, 0xf8,
+	0xe7, 0x99, 0x63, 0xd2, 0x87, 0x2d, 0xf9, 0x23, 0x01, 0xd9, 0x4d, 0x89, 0x8c, 0x7f, 0x35, 0xd8,
+	0x24, 0x71, 0x57, 0x48, 0xd4, 0xf4, 0x72, 0x2c, 0xd1, 0x72, 0x50, 0xe0, 0x0f, 0xa1, 0x10, 0xae,
+	0xa0, 0x89, 0x47, 0xa6, 0x97, 0xd2, 0xc6, 0xba, 0x2d, 0xe1, 0xff, 0x33, 0xe4, 0xa7, 0x50, 0x8a,
+	0x17, 0x0c, 0xb2, 0x9f, 0xc8, 0xb1, 0x74, 0x7e, 0x34, 0x1a, 0xeb, 0x58, 0xe9, 0x67, 0x91, 0x6a,
+	0xfc, 0x2c, 0xb1, 0x7c, 0x90, 0x2b, 0x99, 0x07, 0xb8, 0x7c, 0x90, 0x7a, 0xea, 0xfa, 0xc4, 0x3e,
+	0xb2, 0xf6, 0x61, 0x7a, 0x43, 0x88, 0x7c, 0x4c, 0x48, 0x4a, 0x64, 0xf3, 0x7b, 0x6b, 0xf2, 0x73,
+	0xf2, 0x33, 0x50, 0x43, 0x07, 0x88, 0x15, 0x81, 0x2c, 0x8d, 0x95, 0xdc, 0x63, 0x1a, 0x4b, 0x65,
+	0x56, 0x97, 0x89, 0x35, 0xd2, 0xdd, 0x05, 0x6f, 0x72, 0x21, 0xed, 0x3a, 0x96, 0x2e, 0x26, 0xcb,
+	0x84, 0xf4, 0xe4, 0x10, 0x9f, 0x96, 0x9e, 0x9a, 0x41, 0xf5, 0x43, 0x21, 0xbd, 0x41, 0xea, 0x29,
+	0xe9, 0xdf, 0x21, 0xa6, 0xf9, 0x3d, 0xb5, 0x39, 0x6a, 0x50, 0xc5, 0xc1, 0x42, 0xb8, 0xfc, 0x41,
+	0x1d, 0x96, 0x56, 0x5b, 0x59, 0xc9, 0xf4, 0x7d, 0x71, 0xc9, 0x0e, 0xd9, 0x4e, 0x84, 0x42, 0xac,
+	0xc1, 0x52, 0xfa, 0x83, 0x3a, 0x24, 0xa5, 0xa7, 0x55, 0x78, 0x2a, 0xa4, 0xef, 0x93, 0xbd, 0xa4,
+	0xf4, 0xa4, 0x06, 0xdf, 0x40, 0x05, 0xef, 0x88, 0x46, 0xcb, 0x20, 0x11, 0xc9, 0xa9, 0xf9, 0xb5,
+	0xb1, 0x77, 0x8f, 0x9e, 0xce, 0x0e, 0x52, 0x13, 0x57, 0x04, 0x94, 0x37, 0xe5, 0xcc, 0x4a, 0x38,
+	0x90, 0xfb, 0x53, 0x17, 0xd1, 0x63, 0x39, 0x1b, 0x47, 0xb2, 0xc6, 0x83, 0x2d, 0x42, 0x3f, 0x10,
+	0x17, 0xee, 0x92, 0xc7, 0xe2, 0xc2, 0x08, 0xd0, 0xf4, 0xa4, 0xfc, 0x5f, 0x00, 0x19, 0x3e, 0x74,
+	0xeb, 0xc6, 0x66, 0xd5, 0x78, 0xef, 0x41, 0x4c, 0xda, 0xa0, 0xfa, 0xda, 0xcb, 0x31, 0x85, 0x19,
+	0xa8, 0xc9, 0xfe, 0x43, 0x96, 0xba, 0xac, 0xe9, 0x56, 0x8d, 0x77, 0x37, 0x70, 0xc3, 0xdb, 0xea,
+	0xe2, 0x36, 0x42, 0x34, 0xbc, 0x0d, 0x07, 0x87, 0x66, 0x20, 0x61, 0xd7, 0x5b, 0xe2, 0x97, 0xf1,
+	0xcf, 0xfe, 0x1d, 0x00, 0x00, 0xff, 0xff, 0x0f, 0x75, 0x93, 0x1d, 0x50, 0x17, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.

looprpc/client.proto

@@ -153,6 +153,16 @@ message LoopOutRequest {
     */
     string dest = 2;
 
+    /*
+    Exact amount in satoshis to send to 'dest'. Optional.
+    */
+    int64 dest_amount = 15;
+
+    /*
+    Base58 encoded change address for the swap.
+    */
+    string change_addr = 16;
+
     /*
     Maximum off-chain fee in sat that may be paid for swap payment to the server.
     This limit is applied during path finding. Typically this value is taken
@@ -589,6 +599,11 @@ message QuoteRequest {
     */
     int64 amt = 1;
 
+    /*
+    If change output will be added. This is needed to send exact amount.
+    */
+    bool with_change = 5;
+
     /*
     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

looprpc/client.swagger.json

@@ -148,6 +148,14 @@
             "type": "string",
             "format": "int64"
           },
+          {
+            "name": "with_change",
+            "description": "If change output will be added. This is needed to send exact amount.",
+            "in": "query",
+            "required": false,
+            "type": "boolean",
+            "format": "boolean"
+          },
           {
             "name": "conf_target",
             "description": "The 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.",
@@ -261,6 +269,14 @@
             "type": "string",
             "format": "int64"
           },
+          {
+            "name": "with_change",
+            "description": "If change output will be added. This is needed to send exact amount.",
+            "in": "query",
+            "required": false,
+            "type": "boolean",
+            "format": "boolean"
+          },
           {
             "name": "conf_target",
             "description": "The 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.",
@@ -615,6 +631,15 @@
           "type": "string",
           "description": "Base58 encoded destination address for the swap."
         },
+        "dest_amount": {
+          "type": "string",
+          "format": "int64",
+          "description": "Exact amount in satoshis to send to 'dest'. Optional."
+        },
+        "change_addr": {
+          "type": "string",
+          "description": "Base58 encoded change address for the swap."
+        },
         "max_swap_routing_fee": {
           "type": "string",
           "format": "int64",

release_notes.md

@@ -16,6 +16,12 @@ This file tracks release notes for the loop client.
 
 #### NewFeatures
 
+* When making `loop out`, users can request exact amount to be delivered
+  to destination address. The user provides options `--dest_amt` and `--change_addr`
+  for that. In this case exactly `--dest_amt` is delivered to `--addr` and the change
+  amount goes to `--change_addr`. The following must be true: `amt >= max_miner_fee + dest_amt`.
+  This mode of operation is useful to pay to merchants expecting an exact amount for a purchase.
+
 #### Breaking Changes
 
 #### Bug Fixes

sweep/sweeper.go

@@ -25,8 +25,9 @@ func (s *Sweeper) CreateSweepTx(
 	htlc *swap.Htlc, htlcOutpoint wire.OutPoint,
 	keyBytes [33]byte,
 	witnessFunc func(sig []byte) (wire.TxWitness, error),
-	amount, fee btcutil.Amount,
-	destAddr btcutil.Address) (*wire.MsgTx, error) {
+	amount, destAmount, feeOnlyDest, feeOnlyChange, feeBoth btcutil.Amount,
+	destAddr, changeAddr btcutil.Address,
+	warnf func(message string, args ...interface{})) (*wire.MsgTx, error) {
 
 	// Compose tx.
 	sweepTx := wire.NewMsgTx(2)
@@ -40,16 +41,28 @@ func (s *Sweeper) CreateSweepTx(
 		Sequence:         sequence,
 	})
 
-	// Add output for the destination address.
-	sweepPkScript, err := txscript.PayToAddrScript(destAddr)
+	destinations, err := deduceDestinations(amount, destAmount,
+		feeOnlyDest, feeOnlyChange, feeBoth,
+		destAddr, changeAddr)
 	if err != nil {
 		return nil, err
 	}
+	if len(destinations) == 1 && destinations[0].addr == changeAddr {
+		warnf("Not sufficient coin size to send to destAddr, so sending to changeAddr. amount=%s, destination=destAmount, fee=%s. This must be a bug.", amount, destAmount, feeOnlyDest)
+	}
 
-	sweepTx.AddTxOut(&wire.TxOut{
-		PkScript: sweepPkScript,
-		Value:    int64(amount - fee),
-	})
+	// Add outputs.
+	for _, dst := range destinations {
+		sweepPkScript, err := txscript.PayToAddrScript(dst.addr)
+		if err != nil {
+			return nil, err
+		}
+
+		sweepTx.AddTxOut(&wire.TxOut{
+			PkScript: sweepPkScript,
+			Value:    int64(dst.amount),
+		})
+	}
 
 	// Generate a signature for the swap htlc transaction.
 
@@ -92,18 +105,49 @@ func (s *Sweeper) CreateSweepTx(
 // estimator.
 func (s *Sweeper) GetSweepFee(ctx context.Context,
 	addInputEstimate func(*input.TxWeightEstimator),
-	destAddr btcutil.Address, sweepConfTarget int32) (
-	btcutil.Amount, error) {
+	destAddr, changeAddr btcutil.Address, sweepConfTarget int32) (
+	feeOnlyDest, feeOnlyChange, feeBoth btcutil.Amount, err error) {
 
 	// Get fee estimate from lnd.
 	feeRate, err := s.Lnd.WalletKit.EstimateFee(ctx, sweepConfTarget)
 	if err != nil {
-		return 0, fmt.Errorf("estimate fee: %v", err)
+		return 0, 0, 0, fmt.Errorf("estimate fee: %v", err)
 	}
 
-	// Calculate weight for this tx.
-	var weightEstimate input.TxWeightEstimator
-	switch destAddr.(type) {
+	// Calculate feeOnlyDest.
+	var estOnlyDest input.TxWeightEstimator
+	if err := addOutput(&estOnlyDest, destAddr); err != nil {
+		return 0, 0, 0, err
+	}
+	addInputEstimate(&estOnlyDest)
+	feeOnlyDest = feeRate.FeeForWeight(int64(estOnlyDest.Weight()))
+
+	if changeAddr != nil {
+		// Calculate feeOnlyChange.
+		var estOnlyChange input.TxWeightEstimator
+		if err := addOutput(&estOnlyChange, changeAddr); err != nil {
+			return 0, 0, 0, err
+		}
+		addInputEstimate(&estOnlyChange)
+		feeOnlyChange = feeRate.FeeForWeight(int64(estOnlyChange.Weight()))
+
+		// Calculate feeBoth.
+		var estBoth input.TxWeightEstimator
+		if err := addOutput(&estBoth, destAddr); err != nil {
+			return 0, 0, 0, err
+		}
+		if err := addOutput(&estBoth, changeAddr); err != nil {
+			return 0, 0, 0, err
+		}
+		addInputEstimate(&estBoth)
+		feeBoth = feeRate.FeeForWeight(int64(estBoth.Weight()))
+	}
+
+	return feeOnlyDest, feeOnlyChange, feeBoth, nil
+}
+
+func addOutput(weightEstimate *input.TxWeightEstimator, addr btcutil.Address) error {
+	switch addr.(type) {
 	case *btcutil.AddressWitnessScriptHash:
 		weightEstimate.AddP2WSHOutput()
 	case *btcutil.AddressWitnessPubKeyHash:
@@ -113,11 +157,78 @@ func (s *Sweeper) GetSweepFee(ctx context.Context,
 	case *btcutil.AddressPubKeyHash:
 		weightEstimate.AddP2PKHOutput()
 	default:
-		return 0, fmt.Errorf("unknown address type %T", destAddr)
+		return fmt.Errorf("unknown address type %T", addr)
 	}
+	return nil
+}
+
+const dustOutput = 2020 // FIXME: find the actual value.
 
-	addInputEstimate(&weightEstimate)
-	weight := weightEstimate.Weight()
+type destination struct {
+	addr   btcutil.Address
+	amount btcutil.Amount
+}
+
+func deduceDestinations(amount, destAmount, feeOnlyDest, feeOnlyChange, feeBoth btcutil.Amount,
+	destAddr, changeAddr btcutil.Address) ([]destination, error) {
 
-	return feeRate.FeeForWeight(int64(weight)), nil
+	if (destAmount != 0) != (changeAddr != nil) {
+		return nil, fmt.Errorf("provide either both destAmount and changeAddr or none of them")
+	}
+	if (feeOnlyChange != 0) != (changeAddr != nil) {
+		return nil, fmt.Errorf("provide either both feeOnlyChange and changeAddr or none of them")
+	}
+	if (feeBoth != 0) != (changeAddr != nil) {
+		return nil, fmt.Errorf("provide either both feeBoth and changeAddr or none of them")
+	}
+
+	if changeAddr == nil {
+		// No change. Just put everything on the main destination address.
+		return []destination{
+			{
+				addr:   destAddr,
+				amount: amount - feeOnlyDest,
+			},
+		}, nil
+	}
+
+	changeAmount := amount - destAmount - feeBoth
+
+	if changeAmount > dustOutput {
+		// Change is large enough. Return tx with 2 outputs.
+		return []destination{
+			{
+				addr:   destAddr,
+				amount: destAmount,
+			},
+			{
+				addr:   changeAddr,
+				amount: changeAmount,
+			},
+		}, nil
+	}
+
+	// If we are here, then changeAmount is below dustOutput so we drop the change.
+
+	if amount-destAmount >= feeOnlyDest {
+		// We still can send destAmount to destAddr.
+		return []destination{
+			{
+				addr:   destAddr,
+				amount: destAmount,
+			},
+		}, nil
+	}
+
+	// We can not send destAmount to destAddr. This must be a bug, because we
+	// checked in swapClientServer.LoopOut that amt >= max_miner_fee + dest_amt.
+	// However it is better to send everything to change address than to crash.
+	// The warning is logged by CreateSweepTx.
+
+	return []destination{
+		{
+			addr:   changeAddr,
+			amount: amount - feeOnlyChange,
+		},
+	}, nil
 }

sweep/sweeper_test.go

@@ -0,0 +1,184 @@
+package sweep
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/btcsuite/btcd/chaincfg"
+	"github.com/btcsuite/btcutil"
+)
+
+func TestDeduceDestinations(t *testing.T) {
+	wpkh := [20]byte{}
+	addr1, err := btcutil.NewAddressWitnessPubKeyHash(wpkh[:], &chaincfg.MainNetParams)
+	if err != nil {
+		t.Fatal(err)
+	}
+	wsh := [32]byte{}
+	addr2, err := btcutil.NewAddressWitnessScriptHash(wsh[:], &chaincfg.MainNetParams)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	testCases := []struct {
+		name                                                    string
+		amount, destAmount, feeOnlyDest, feeOnlyChange, feeBoth btcutil.Amount
+		destAddr, changeAddr                                    btcutil.Address
+		wantedDestinations                                      []destination
+		wantError                                               bool
+	}{
+		{
+			name:          "missing changeAddr",
+			amount:        1000000,
+			destAmount:    950000,
+			feeOnlyDest:   150,
+			feeOnlyChange: 150,
+			feeBoth:       200,
+			destAddr:      addr1,
+			changeAddr:    nil, // Error!
+			wantError:     true,
+		},
+		{
+			name:          "missing feeOnlyChange",
+			amount:        1000000,
+			destAmount:    950000,
+			feeOnlyDest:   150,
+			feeOnlyChange: 0, // Error!
+			feeBoth:       200,
+			destAddr:      addr1,
+			changeAddr:    addr2,
+			wantError:     true,
+		},
+		{
+			name:          "missing feeBoth",
+			amount:        1000000,
+			destAmount:    950000,
+			feeOnlyDest:   150,
+			feeOnlyChange: 150,
+			feeBoth:       0, // Error!
+			destAddr:      addr1,
+			changeAddr:    addr2,
+			wantError:     true,
+		},
+
+		{
+			name:        "exact amount was not requested",
+			amount:      1000000,
+			feeOnlyDest: 150,
+			destAddr:    addr1,
+			wantedDestinations: []destination{
+				{
+					addr:   addr1,
+					amount: 1000000 - 150,
+				},
+			},
+		},
+		{
+			name:          "exact amount and change",
+			amount:        1000000,
+			destAmount:    950000,
+			feeOnlyDest:   150,
+			feeOnlyChange: 160,
+			feeBoth:       200,
+			destAddr:      addr1,
+			changeAddr:    addr2,
+			wantedDestinations: []destination{
+				{
+					addr:   addr1,
+					amount: 950000,
+				},
+				{
+					addr:   addr2,
+					amount: 1000000 - 950000 - 200,
+				},
+			},
+		},
+		{
+			name:          "fee for both outputs is too large, but can send to destAddr",
+			amount:        1000000,
+			destAmount:    950000,
+			feeOnlyDest:   50000,
+			feeOnlyChange: 51000,
+			feeBoth:       70000,
+			destAddr:      addr1,
+			changeAddr:    addr2,
+			wantedDestinations: []destination{
+				{
+					addr:   addr1,
+					amount: 950000,
+				},
+			},
+		},
+		{
+			name:          "fee for both outputs does not left room for change output",
+			amount:        1000000,
+			destAmount:    950000,
+			feeOnlyDest:   45000,
+			feeOnlyChange: 46000,
+			feeBoth:       50000,
+			destAddr:      addr1,
+			changeAddr:    addr2,
+			wantedDestinations: []destination{
+				{
+					addr:   addr1,
+					amount: 950000,
+				},
+			},
+		},
+		{
+			name:          "fee for both outputs makes change output below dust",
+			amount:        1000000,
+			destAmount:    950000,
+			feeOnlyDest:   45000,
+			feeOnlyChange: 46000,
+			feeBoth:       49990,
+			destAddr:      addr1,
+			changeAddr:    addr2,
+			wantedDestinations: []destination{
+				{
+					addr:   addr1,
+					amount: 950000,
+				},
+			},
+		},
+		{
+			name:          "fee for both and for dest is too large, send everything to change address",
+			amount:        1000000,
+			destAmount:    950000,
+			feeOnlyDest:   51000,
+			feeOnlyChange: 52000,
+			feeBoth:       53000,
+			destAddr:      addr1,
+			changeAddr:    addr2,
+			wantedDestinations: []destination{
+				{
+					addr:   addr2,
+					amount: 948000,
+				},
+			},
+		},
+	}
+
+	for _, tc := range testCases {
+		gotDestinations, err := deduceDestinations(
+			tc.amount, tc.destAmount, tc.feeOnlyDest, tc.feeOnlyChange, tc.feeBoth,
+			tc.destAddr, tc.changeAddr,
+		)
+
+		if tc.wantError {
+			if err == nil {
+				t.Errorf("case %q: wanted error, but there is no error", tc.name)
+			}
+			continue
+		}
+
+		if err != nil {
+			t.Errorf("case %q: failed: %v", tc.name, err)
+			continue
+		}
+
+		if !reflect.DeepEqual(tc.wantedDestinations, gotDestinations) {
+			t.Errorf("case %q: wanted %v, got %v", tc.name, tc.wantedDestinations, gotDestinations)
+		}
+	}
+}