15838907453

Committed 24 Jun 2025 01:26AM UTC coverage: 57.079% (-11.1%) from 68.172%

Build # 15838907453

Build Type

Pull #9982

github

Committed by

web-flow

Commit Message

Merge e42780be2 into 45c15646c

Pull Request Pull Request #9982: lnwire+lnwallet: add LocalNonces field for splice nonce coordination w/ taproot channels

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75.49

/sweep/walletsweep.go

package sweep

import (
        "errors"
        "fmt"
        "maps"
        "math"
        "slices"
        "time"

        "github.com/btcsuite/btcd/btcutil"
        "github.com/btcsuite/btcd/txscript"
        "github.com/btcsuite/btcd/wire"
        "github.com/btcsuite/btcwallet/wtxmgr"
        "github.com/lightningnetwork/lnd/fn/v2"
        "github.com/lightningnetwork/lnd/input"
        "github.com/lightningnetwork/lnd/lnwallet"
        "github.com/lightningnetwork/lnd/lnwallet/chainfee"
        "github.com/lightningnetwork/lnd/lnwallet/chanfunding"
)

var (
        // ErrNoFeePreference is returned when we attempt to satisfy a sweep
        // request from a client whom did not specify a fee preference.
        ErrNoFeePreference = errors.New("no fee preference specified")

        // ErrFeePreferenceConflict is returned when both a fee rate and a conf
        // target is set for a fee preference.
        ErrFeePreferenceConflict = errors.New("fee preference conflict")

        // ErrUnknownUTXO is returned when creating a sweeping tx using an UTXO
        // that's unknown to the wallet.
        ErrUnknownUTXO = errors.New("unknown utxo")
)

// FeePreference defines an interface that allows the caller to specify how the
// fee rate should be handled. Depending on the implementation, the fee rate
// can either be specified directly, or via a conf target which relies on the
// chain backend(`bitcoind`) to give a fee estimation, or a customized fee
// function which handles fee calculation based on the specified
// urgency(deadline).
type FeePreference interface {
        // String returns a human-readable string of the fee preference.
        String() string

        // Estimate takes a fee estimator and a max allowed fee rate and
        // returns a fee rate for the given fee preference. It ensures that the
        // fee rate respects the bounds of the relay fee and the specified max
        // fee rates.
        Estimate(chainfee.Estimator,
                chainfee.SatPerKWeight) (chainfee.SatPerKWeight, error)
}

// FeeEstimateInfo allows callers to express their time value for inclusion of
// a transaction into a block via either a confirmation target, or a fee rate.
type FeeEstimateInfo struct {
        // ConfTarget if non-zero, signals a fee preference expressed in the
        // number of desired blocks between first broadcast, and confirmation.
        ConfTarget uint32

        // FeeRate if non-zero, signals a fee pre fence expressed in the fee
        // rate expressed in sat/kw for a particular transaction.
        FeeRate chainfee.SatPerKWeight
}

// Compile-time constraint to ensure FeeEstimateInfo implements FeePreference.
var _ FeePreference = (*FeeEstimateInfo)(nil)

// String returns a human-readable string of the fee preference.
func (f FeeEstimateInfo) String() string {
        if f.ConfTarget != 0 {
                return fmt.Sprintf("%v blocks", f.ConfTarget)
        }

        return f.FeeRate.String()
}

// Estimate returns a fee rate for the given fee preference. It ensures that
// the fee rate respects the bounds of the relay fee and the max fee rates, if
// specified.
func (f FeeEstimateInfo) Estimate(estimator chainfee.Estimator,
        maxFeeRate chainfee.SatPerKWeight) (chainfee.SatPerKWeight, error) {

        var (
                feeRate chainfee.SatPerKWeight
                err     error
        )

        switch {
        // Ensure a type of fee preference is specified to prevent using a
        // default below.
        case f.FeeRate == 0 && f.ConfTarget == 0:
                return 0, ErrNoFeePreference

        // If both values are set, then we'll return an error as we require a
        // strict directive.
        case f.FeeRate != 0 && f.ConfTarget != 0:
                return 0, ErrFeePreferenceConflict

        // If the target number of confirmations is set, then we'll use that to
        // consult our fee estimator for an adequate fee.
        case f.ConfTarget != 0:
                feeRate, err = estimator.EstimateFeePerKW((f.ConfTarget))
                if err != nil {
                        return 0, fmt.Errorf("unable to query fee "+
                                "estimator: %w", err)
                }

        // If a manual sat/kw fee rate is set, then we'll use that directly.
        // We'll need to convert it to sat/kw as this is what we use
        // internally.
        case f.FeeRate != 0:
                feeRate = f.FeeRate

                // Because the user can specify 1 sat/vByte on the RPC
                // interface, which corresponds to 250 sat/kw, we need to bump
                // that to the minimum "safe" fee rate which is 253 sat/kw.
                if feeRate == chainfee.AbsoluteFeePerKwFloor {
                        log.Infof("Manual fee rate input of %d sat/kw is "+
                                "too low, using %d sat/kw instead", feeRate,
                                chainfee.FeePerKwFloor)

                        feeRate = chainfee.FeePerKwFloor
                }
        }

        // Get the relay fee as the min fee rate.
        minFeeRate := estimator.RelayFeePerKW()

        // If that bumped fee rate of at least 253 sat/kw is still lower than
        // the relay fee rate, we return an error to let the user know. Note
        // that "Relay fee rate" may mean slightly different things depending
        // on the backend. For bitcoind, it is effectively max(relay fee, min
        // mempool fee).
        if feeRate < minFeeRate {
                return 0, fmt.Errorf("%w: got %v, minimum is %v",
                        ErrFeePreferenceTooLow, feeRate, minFeeRate)
        }

        // If a maxFeeRate is specified and the estimated fee rate is above the
        // maximum allowed fee rate, default to the max fee rate.
        if maxFeeRate != 0 && feeRate > maxFeeRate {
                log.Warnf("Estimated fee rate %v exceeds max allowed fee "+
                        "rate %v, using max fee rate instead", feeRate,
                        maxFeeRate)

                return maxFeeRate, nil
        }

        return feeRate, nil
}

// UtxoSource is an interface that allows a caller to access a source of UTXOs
// to use when crafting sweep transactions.
type UtxoSource interface {
        // ListUnspentWitnessFromDefaultAccount returns all UTXOs from the
        // default wallet account that have between minConfs and maxConfs
        // number of confirmations.
        ListUnspentWitnessFromDefaultAccount(minConfs, maxConfs int32) (
                []*lnwallet.Utxo, error)
}

// CoinSelectionLocker is an interface that allows the caller to perform an
// operation, which is synchronized with all coin selection attempts. This can
// be used when an operation requires that all coin selection operations cease
// forward progress. Think of this as an exclusive lock on coin selection
// operations.
type CoinSelectionLocker interface {
        // WithCoinSelectLock will execute the passed function closure in a
        // synchronized manner preventing any coin selection operations from
        // proceeding while the closure is executing. This can be seen as the
        // ability to execute a function closure under an exclusive coin
        // selection lock.
        WithCoinSelectLock(func() error) error
}

// OutputLeaser allows a caller to lease/release an output. When leased, the
// outputs shouldn't be used for any sort of channel funding or coin selection.
// Leased outputs are expected to be persisted between restarts.
type OutputLeaser interface {
        // LeaseOutput leases a target output, rendering it unusable for coin
        // selection.
        LeaseOutput(i wtxmgr.LockID, o wire.OutPoint, d time.Duration) (
                time.Time, error)

        // ReleaseOutput releases a target output, allowing it to be used for
        // coin selection once again.
        ReleaseOutput(i wtxmgr.LockID, o wire.OutPoint) error
}

// WalletSweepPackage is a package that gives the caller the ability to sweep
// relevant funds from a wallet in a single transaction. We also package a
// function closure that allows one to abort the operation.
type WalletSweepPackage struct {
        // SweepTx is a fully signed, and valid transaction that is broadcast,
        // will sweep ALL relevant confirmed coins in the wallet with a single
        // transaction.
        SweepTx *wire.MsgTx

        // CancelSweepAttempt allows the caller to cancel the sweep attempt.
        //
        // NOTE: If the sweeping transaction isn't or cannot be broadcast, then
        // this closure MUST be called, otherwise all selected utxos will be
        // unable to be used.
        CancelSweepAttempt func()
}

// DeliveryAddr is a pair of (address, amount) used to craft a transaction
// paying to more than one specified address.
type DeliveryAddr struct {
        // Addr is the address to pay to.
        Addr btcutil.Address

        // Amt is the amount to pay to the given address.
        Amt btcutil.Amount
}

// CraftSweepAllTx attempts to craft a WalletSweepPackage which will allow the
// caller to sweep ALL funds in ALL or SELECT outputs within the wallet to a
// list of outputs. Any leftover amount after these outputs and transaction fee,
// is sent to a single output, as specified by the change address. The sweep
// transaction will be crafted with the target fee rate, and will use the
// utxoSource and outputLeaser as sources for wallet funds.
func CraftSweepAllTx(feeRate, maxFeeRate chainfee.SatPerKWeight,
        blockHeight uint32, deliveryAddrs []DeliveryAddr,
        changeAddr btcutil.Address, coinSelectLocker CoinSelectionLocker,
        utxoSource UtxoSource, outputLeaser OutputLeaser,
        signer input.Signer, minConfs int32,
        selectUtxos fn.Set[wire.OutPoint]) (*WalletSweepPackage, error) {

        // TODO(roasbeef): turn off ATPL as well when available?

        var outputsForSweep []*lnwallet.Utxo

        // We'll make a function closure up front that allows us to unlock all
        // selected outputs to ensure that they become available again in the
        // case of an error after the outputs have been locked, but before we
        // can actually craft a sweeping transaction.
        unlockOutputs := func() {
                for _, utxo := range outputsForSweep {
                        // Log the error but continue since we're already
                        // handling an error.
                        err := outputLeaser.ReleaseOutput(
                                chanfunding.LndInternalLockID, utxo.OutPoint,
                        )
                        if err != nil {
                                log.Warnf("Failed to release UTXO %s (%v))",
                                        utxo.OutPoint, err)
                        }
                }
        }

        // Next, we'll use the coinSelectLocker to ensure that no coin
        // selection takes place while we fetch and lock outputs in the
        // wallet. Otherwise, it may be possible for a new funding flow to lock
        // an output while we fetch the set of unspent witnesses.
        err := coinSelectLocker.WithCoinSelectLock(func() error {
                log.Trace("[WithCoinSelectLock] entered the lock")

                // Now that we can be sure that no other coin selection
                // operations are going on, we can grab a clean snapshot of the
                // current UTXO state of the wallet.
                utxos, err := utxoSource.ListUnspentWitnessFromDefaultAccount(
                        minConfs, math.MaxInt32,
                )
                if err != nil {
                        return err
                }

                log.Trace("[WithCoinSelectLock] finished fetching UTXOs")

                // Use select utxos, if provided.
                if len(selectUtxos) > 0 {
                        utxos, err = fetchUtxosFromOutpoints(
                                utxos, selectUtxos.ToSlice(),
                        )
                        if err != nil {
                                return err
                        }
                }

                // We'll now lock each UTXO to ensure that other callers don't
                // attempt to use these UTXOs in transactions while we're
                // crafting out sweep all transaction.
                for _, utxo := range utxos {
                        log.Tracef("[WithCoinSelectLock] leasing utxo: %v",
                                utxo.OutPoint)

                        _, err = outputLeaser.LeaseOutput(
                                chanfunding.LndInternalLockID, utxo.OutPoint,
                                chanfunding.DefaultLockDuration,
                        )
                        if err != nil {
                                return err
                        }
                }

                log.Trace("[WithCoinSelectLock] exited the lock")

                outputsForSweep = append(outputsForSweep, utxos...)

                return nil
        })
        if err != nil {
                // If we failed at all, we'll unlock any outputs selected just
                // in case we had any lingering outputs.
                unlockOutputs()

                return nil, fmt.Errorf("unable to fetch+lock wallet utxos: %w",
                        err)
        }

        // Now that we've locked all the potential outputs to sweep, we'll
        // assemble an input for each of them, so we can hand it off to the
        // sweeper to generate and sign a transaction for us.
        var inputsToSweep []input.Input
        for _, output := range outputsForSweep {
                // As we'll be signing for outputs under control of the wallet,
                // we only need to populate the output value and output script.
                // The rest of the items will be populated internally within
                // the sweeper via the witness generation function.
                signDesc := &input.SignDescriptor{
                        Output: &wire.TxOut{
                                PkScript: output.PkScript,
                                Value:    int64(output.Value),
                        },
                        HashType: txscript.SigHashAll,
                }

                pkScript := output.PkScript

                // Based on the output type, we'll map it to the proper witness
                // type so we can generate the set of input scripts needed to
                // sweep the output.
                var witnessType input.WitnessType
                switch output.AddressType {

                // If this is a p2wkh output, then we'll assume it's a witness
                // key hash witness type.
                case lnwallet.WitnessPubKey:
                        witnessType = input.WitnessKeyHash

                // If this is a p2sh output, then as since it's under control
                // of the wallet, we'll assume it's a nested p2sh output.
                case lnwallet.NestedWitnessPubKey:
                        witnessType = input.NestedWitnessKeyHash

                case lnwallet.TaprootPubkey:
                        witnessType = input.TaprootPubKeySpend
                        signDesc.HashType = txscript.SigHashDefault

                // All other output types we count as unknown and will fail to
                // sweep.
                default:
                        unlockOutputs()

                        return nil, fmt.Errorf("unable to sweep coins, "+
                                "unknown script: %x", pkScript[:])
                }

                // Now that we've constructed the items required, we'll make an
                // input which can be passed to the sweeper for ultimate
                // sweeping.
                input := input.MakeBaseInput(
                        &output.OutPoint, witnessType, signDesc, 0, nil,
                )
                inputsToSweep = append(inputsToSweep, &input)
        }

        // Create a list of TxOuts from the given delivery addresses.
        var txOuts []*wire.TxOut
        for _, d := range deliveryAddrs {
                pkScript, err := txscript.PayToAddrScript(d.Addr)
                if err != nil {
                        unlockOutputs()

                        return nil, err
                }

                txOuts = append(txOuts, &wire.TxOut{
                        PkScript: pkScript,
                        Value:    int64(d.Amt),
                })
        }

        // Next, we'll convert the change addr to a pkScript that we can use
        // to create the sweep transaction.
        changePkScript, err := txscript.PayToAddrScript(changeAddr)
        if err != nil {
                unlockOutputs()

                return nil, err
        }

        // Finally, we'll ask the sweeper to craft a sweep transaction which
        // respects our fee preference and targets all the UTXOs of the wallet.
        sweepTx, _, err := createSweepTx(
                inputsToSweep, txOuts, changePkScript, blockHeight,
                feeRate, maxFeeRate, signer,
        )
        if err != nil {
                unlockOutputs()

                return nil, err
        }

        return &WalletSweepPackage{
                SweepTx:            sweepTx,
                CancelSweepAttempt: unlockOutputs,
        }, nil
}

// fetchUtxosFromOutpoints returns UTXOs for given outpoints. Errors if any
// outpoint is not in the passed slice of utxos.
func fetchUtxosFromOutpoints(utxos []*lnwallet.Utxo,
        outpoints []wire.OutPoint) ([]*lnwallet.Utxo, error) {

        lookup := fn.SliceToMap(utxos, func(utxo *lnwallet.Utxo) wire.OutPoint {
                return utxo.OutPoint
        }, func(utxo *lnwallet.Utxo) *lnwallet.Utxo {
                return utxo
        })

        subMap, err := fn.NewSubMap(lookup, outpoints)
        if err != nil {
                return nil, fmt.Errorf("%w: %v", ErrUnknownUTXO, err.Error())
        }

        fetchedUtxos := slices.Collect(maps.Values(subMap))

        return fetchedUtxos, nil
}

1	package sweep
2
3	import (
4	"errors"
5	"fmt"
6	"maps"
7	"math"
8	"slices"
9	"time"
10
11	"github.com/btcsuite/btcd/btcutil"
12	"github.com/btcsuite/btcd/txscript"
13	"github.com/btcsuite/btcd/wire"
14	"github.com/btcsuite/btcwallet/wtxmgr"
15	"github.com/lightningnetwork/lnd/fn/v2"
16	"github.com/lightningnetwork/lnd/input"
17	"github.com/lightningnetwork/lnd/lnwallet"
18	"github.com/lightningnetwork/lnd/lnwallet/chainfee"
19	"github.com/lightningnetwork/lnd/lnwallet/chanfunding"
20	)
21
22	var (
23	// ErrNoFeePreference is returned when we attempt to satisfy a sweep
24	// request from a client whom did not specify a fee preference.
25	ErrNoFeePreference = errors.New("no fee preference specified")
26
27	// ErrFeePreferenceConflict is returned when both a fee rate and a conf
28	// target is set for a fee preference.
29	ErrFeePreferenceConflict = errors.New("fee preference conflict")
30
31	// ErrUnknownUTXO is returned when creating a sweeping tx using an UTXO
32	// that's unknown to the wallet.
33	ErrUnknownUTXO = errors.New("unknown utxo")
34	)
35
36	// FeePreference defines an interface that allows the caller to specify how the
37	// fee rate should be handled. Depending on the implementation, the fee rate
38	// can either be specified directly, or via a conf target which relies on the
39	// chain backend(`bitcoind`) to give a fee estimation, or a customized fee
40	// function which handles fee calculation based on the specified
41	// urgency(deadline).
42	type FeePreference interface {
43	// String returns a human-readable string of the fee preference.
44	String() string
45
46	// Estimate takes a fee estimator and a max allowed fee rate and
47	// returns a fee rate for the given fee preference. It ensures that the
48	// fee rate respects the bounds of the relay fee and the specified max
49	// fee rates.
50	Estimate(chainfee.Estimator,
51	chainfee.SatPerKWeight) (chainfee.SatPerKWeight, error)
52	}
53
54	// FeeEstimateInfo allows callers to express their time value for inclusion of
55	// a transaction into a block via either a confirmation target, or a fee rate.
56	type FeeEstimateInfo struct {
57	// ConfTarget if non-zero, signals a fee preference expressed in the
58	// number of desired blocks between first broadcast, and confirmation.
59	ConfTarget uint32
60
61	// FeeRate if non-zero, signals a fee pre fence expressed in the fee
62	// rate expressed in sat/kw for a particular transaction.
63	FeeRate chainfee.SatPerKWeight
64	}
65
66	// Compile-time constraint to ensure FeeEstimateInfo implements FeePreference.
67	var _ FeePreference = (*FeeEstimateInfo)(nil)
68
69	// String returns a human-readable string of the fee preference.
70	func (f FeeEstimateInfo) String() string {	×
71	if f.ConfTarget != 0 {	×
72	return fmt.Sprintf("%v blocks", f.ConfTarget)	×
73	}	×
74
75	return f.FeeRate.String()	×
76	}
77
78	// Estimate returns a fee rate for the given fee preference. It ensures that
79	// the fee rate respects the bounds of the relay fee and the max fee rates, if
80	// specified.
81	func (f FeeEstimateInfo) Estimate(estimator chainfee.Estimator,
82	maxFeeRate chainfee.SatPerKWeight) (chainfee.SatPerKWeight, error) {	1✔
83		1✔
84	var (	1✔
85	feeRate chainfee.SatPerKWeight	1✔
86	err error	1✔
87	)	1✔
88		1✔
89	switch {	1✔
90	// Ensure a type of fee preference is specified to prevent using a
91	// default below.
UNCOV 92	case f.FeeRate == 0 && f.ConfTarget == 0:	×
UNCOV 93	return 0, ErrNoFeePreference	×
94
95	// If both values are set, then we'll return an error as we require a
96	// strict directive.
UNCOV 97	case f.FeeRate != 0 && f.ConfTarget != 0:	×
UNCOV 98	return 0, ErrFeePreferenceConflict	×
99
100	// If the target number of confirmations is set, then we'll use that to
101	// consult our fee estimator for an adequate fee.
102	case f.ConfTarget != 0:	1✔
103	feeRate, err = estimator.EstimateFeePerKW((f.ConfTarget))	1✔
104	if err != nil {	1✔
UNCOV 105	return 0, fmt.Errorf("unable to query fee "+	×
UNCOV 106	"estimator: %w", err)	×
UNCOV 107	}	×
108
109	// If a manual sat/kw fee rate is set, then we'll use that directly.
110	// We'll need to convert it to sat/kw as this is what we use
111	// internally.
112	case f.FeeRate != 0:	1✔
113	feeRate = f.FeeRate	1✔
114		1✔
115	// Because the user can specify 1 sat/vByte on the RPC	1✔
116	// interface, which corresponds to 250 sat/kw, we need to bump	1✔
117	// that to the minimum "safe" fee rate which is 253 sat/kw.	1✔
118	if feeRate == chainfee.AbsoluteFeePerKwFloor {	2✔
119	log.Infof("Manual fee rate input of %d sat/kw is "+	1✔
120	"too low, using %d sat/kw instead", feeRate,	1✔
121	chainfee.FeePerKwFloor)	1✔
122		1✔
123	feeRate = chainfee.FeePerKwFloor	1✔
124	}	1✔
125	}
126
127	// Get the relay fee as the min fee rate.
128	minFeeRate := estimator.RelayFeePerKW()	1✔
129		1✔
130	// If that bumped fee rate of at least 253 sat/kw is still lower than	1✔
131	// the relay fee rate, we return an error to let the user know. Note	1✔
132	// that "Relay fee rate" may mean slightly different things depending	1✔
133	// on the backend. For bitcoind, it is effectively max(relay fee, min	1✔
134	// mempool fee).	1✔
135	if feeRate < minFeeRate {	1✔
UNCOV 136	return 0, fmt.Errorf("%w: got %v, minimum is %v",	×
UNCOV 137	ErrFeePreferenceTooLow, feeRate, minFeeRate)	×
UNCOV 138	}	×
139
140	// If a maxFeeRate is specified and the estimated fee rate is above the
141	// maximum allowed fee rate, default to the max fee rate.
142	if maxFeeRate != 0 && feeRate > maxFeeRate {	2✔
143	log.Warnf("Estimated fee rate %v exceeds max allowed fee "+	1✔
144	"rate %v, using max fee rate instead", feeRate,	1✔
145	maxFeeRate)	1✔
146		1✔
147	return maxFeeRate, nil	1✔
148	}	1✔
149
150	return feeRate, nil	1✔
151	}
152
153	// UtxoSource is an interface that allows a caller to access a source of UTXOs
154	// to use when crafting sweep transactions.
155	type UtxoSource interface {
156	// ListUnspentWitnessFromDefaultAccount returns all UTXOs from the
157	// default wallet account that have between minConfs and maxConfs
158	// number of confirmations.
159	ListUnspentWitnessFromDefaultAccount(minConfs, maxConfs int32) (
160	[]*lnwallet.Utxo, error)
161	}
162
163	// CoinSelectionLocker is an interface that allows the caller to perform an
164	// operation, which is synchronized with all coin selection attempts. This can
165	// be used when an operation requires that all coin selection operations cease
166	// forward progress. Think of this as an exclusive lock on coin selection
167	// operations.
168	type CoinSelectionLocker interface {
169	// WithCoinSelectLock will execute the passed function closure in a
170	// synchronized manner preventing any coin selection operations from
171	// proceeding while the closure is executing. This can be seen as the
172	// ability to execute a function closure under an exclusive coin
173	// selection lock.
174	WithCoinSelectLock(func() error) error
175	}
176
177	// OutputLeaser allows a caller to lease/release an output. When leased, the
178	// outputs shouldn't be used for any sort of channel funding or coin selection.
179	// Leased outputs are expected to be persisted between restarts.
180	type OutputLeaser interface {
181	// LeaseOutput leases a target output, rendering it unusable for coin
182	// selection.
183	LeaseOutput(i wtxmgr.LockID, o wire.OutPoint, d time.Duration) (
184	time.Time, error)
185
186	// ReleaseOutput releases a target output, allowing it to be used for
187	// coin selection once again.
188	ReleaseOutput(i wtxmgr.LockID, o wire.OutPoint) error
189	}
190
191	// WalletSweepPackage is a package that gives the caller the ability to sweep
192	// relevant funds from a wallet in a single transaction. We also package a
193	// function closure that allows one to abort the operation.
194	type WalletSweepPackage struct {
195	// SweepTx is a fully signed, and valid transaction that is broadcast,
196	// will sweep ALL relevant confirmed coins in the wallet with a single
197	// transaction.
198	SweepTx *wire.MsgTx
199
200	// CancelSweepAttempt allows the caller to cancel the sweep attempt.
201	//
202	// NOTE: If the sweeping transaction isn't or cannot be broadcast, then
203	// this closure MUST be called, otherwise all selected utxos will be
204	// unable to be used.
205	CancelSweepAttempt func()
206	}
207
208	// DeliveryAddr is a pair of (address, amount) used to craft a transaction
209	// paying to more than one specified address.
210	type DeliveryAddr struct {
211	// Addr is the address to pay to.
212	Addr btcutil.Address
213
214	// Amt is the amount to pay to the given address.
215	Amt btcutil.Amount
216	}
217
218	// CraftSweepAllTx attempts to craft a WalletSweepPackage which will allow the
219	// caller to sweep ALL funds in ALL or SELECT outputs within the wallet to a
220	// list of outputs. Any leftover amount after these outputs and transaction fee,
221	// is sent to a single output, as specified by the change address. The sweep
222	// transaction will be crafted with the target fee rate, and will use the
223	// utxoSource and outputLeaser as sources for wallet funds.
224	func CraftSweepAllTx(feeRate, maxFeeRate chainfee.SatPerKWeight,
225	blockHeight uint32, deliveryAddrs []DeliveryAddr,
226	changeAddr btcutil.Address, coinSelectLocker CoinSelectionLocker,
227	utxoSource UtxoSource, outputLeaser OutputLeaser,
228	signer input.Signer, minConfs int32,
229	selectUtxos fn.Set[wire.OutPoint]) (*WalletSweepPackage, error) {	1✔
230		1✔
231	// TODO(roasbeef): turn off ATPL as well when available?	1✔
232		1✔
233	var outputsForSweep []*lnwallet.Utxo	1✔
234		1✔
235	// We'll make a function closure up front that allows us to unlock all	1✔
236	// selected outputs to ensure that they become available again in the	1✔
237	// case of an error after the outputs have been locked, but before we	1✔
238	// can actually craft a sweeping transaction.	1✔
239	unlockOutputs := func() {	2✔
240	for _, utxo := range outputsForSweep {	2✔
241	// Log the error but continue since we're already	1✔
242	// handling an error.	1✔
243	err := outputLeaser.ReleaseOutput(	1✔
244	chanfunding.LndInternalLockID, utxo.OutPoint,	1✔
245	)	1✔
246	if err != nil {	1✔
247	log.Warnf("Failed to release UTXO %s (%v))",	×
248	utxo.OutPoint, err)	×
249	}	×
250	}
251	}
252
253	// Next, we'll use the coinSelectLocker to ensure that no coin
254	// selection takes place while we fetch and lock outputs in the
255	// wallet. Otherwise, it may be possible for a new funding flow to lock
256	// an output while we fetch the set of unspent witnesses.
257	err := coinSelectLocker.WithCoinSelectLock(func() error {	2✔
258	log.Trace("[WithCoinSelectLock] entered the lock")	1✔
259		1✔
260	// Now that we can be sure that no other coin selection	1✔
261	// operations are going on, we can grab a clean snapshot of the	1✔
262	// current UTXO state of the wallet.	1✔
263	utxos, err := utxoSource.ListUnspentWitnessFromDefaultAccount(	1✔
264	minConfs, math.MaxInt32,	1✔
265	)	1✔
266	if err != nil {	1✔
267	return err	×
268	}	×
269
270	log.Trace("[WithCoinSelectLock] finished fetching UTXOs")	1✔
271		1✔
272	// Use select utxos, if provided.	1✔
273	if len(selectUtxos) > 0 {	2✔
274	utxos, err = fetchUtxosFromOutpoints(	1✔
275	utxos, selectUtxos.ToSlice(),	1✔
276	)	1✔
277	if err != nil {	1✔
UNCOV 278	return err	×
UNCOV 279	}	×
280	}
281
282	// We'll now lock each UTXO to ensure that other callers don't
283	// attempt to use these UTXOs in transactions while we're
284	// crafting out sweep all transaction.
285	for _, utxo := range utxos {	2✔
286	log.Tracef("[WithCoinSelectLock] leasing utxo: %v",	1✔
287	utxo.OutPoint)	1✔
288		1✔
289	_, err = outputLeaser.LeaseOutput(	1✔
290	chanfunding.LndInternalLockID, utxo.OutPoint,	1✔
291	chanfunding.DefaultLockDuration,	1✔
292	)	1✔
293	if err != nil {	1✔
294	return err	×
295	}	×
296	}
297
298	log.Trace("[WithCoinSelectLock] exited the lock")	1✔
299		1✔
300	outputsForSweep = append(outputsForSweep, utxos...)	1✔
301		1✔
302	return nil	1✔
303	})
304	if err != nil {	1✔
UNCOV 305	// If we failed at all, we'll unlock any outputs selected just	×
UNCOV 306	// in case we had any lingering outputs.	×
UNCOV 307	unlockOutputs()	×
UNCOV 308		×
UNCOV 309	return nil, fmt.Errorf("unable to fetch+lock wallet utxos: %w",	×
UNCOV 310	err)	×
UNCOV 311	}	×
312
313	// Now that we've locked all the potential outputs to sweep, we'll
314	// assemble an input for each of them, so we can hand it off to the
315	// sweeper to generate and sign a transaction for us.
316	var inputsToSweep []input.Input	1✔
317	for _, output := range outputsForSweep {	2✔
318	// As we'll be signing for outputs under control of the wallet,	1✔
319	// we only need to populate the output value and output script.	1✔
320	// The rest of the items will be populated internally within	1✔
321	// the sweeper via the witness generation function.	1✔
322	signDesc := &input.SignDescriptor{	1✔
323	Output: &wire.TxOut{	1✔
324	PkScript: output.PkScript,	1✔
325	Value: int64(output.Value),	1✔
326	},	1✔
327	HashType: txscript.SigHashAll,	1✔
328	}	1✔
329		1✔
330	pkScript := output.PkScript	1✔
331		1✔
332	// Based on the output type, we'll map it to the proper witness	1✔
333	// type so we can generate the set of input scripts needed to	1✔
334	// sweep the output.	1✔
335	var witnessType input.WitnessType	1✔
336	switch output.AddressType {	1✔
337
338	// If this is a p2wkh output, then we'll assume it's a witness
339	// key hash witness type.
340	case lnwallet.WitnessPubKey:	1✔
341	witnessType = input.WitnessKeyHash	1✔
342
343	// If this is a p2sh output, then as since it's under control
344	// of the wallet, we'll assume it's a nested p2sh output.
345	case lnwallet.NestedWitnessPubKey:	1✔
346	witnessType = input.NestedWitnessKeyHash	1✔
347
348	case lnwallet.TaprootPubkey:	1✔
349	witnessType = input.TaprootPubKeySpend	1✔
350	signDesc.HashType = txscript.SigHashDefault	1✔
351
352	// All other output types we count as unknown and will fail to
353	// sweep.
UNCOV 354	default:	×
UNCOV 355	unlockOutputs()	×
UNCOV 356		×
UNCOV 357	return nil, fmt.Errorf("unable to sweep coins, "+	×
UNCOV 358	"unknown script: %x", pkScript[:])	×
359	}
360
361	// Now that we've constructed the items required, we'll make an
362	// input which can be passed to the sweeper for ultimate
363	// sweeping.
364	input := input.MakeBaseInput(	1✔
365	&output.OutPoint, witnessType, signDesc, 0, nil,	1✔
366	)	1✔
367	inputsToSweep = append(inputsToSweep, &input)	1✔
368	}
369
370	// Create a list of TxOuts from the given delivery addresses.
371	var txOuts []*wire.TxOut	1✔
372	for _, d := range deliveryAddrs {	2✔
373	pkScript, err := txscript.PayToAddrScript(d.Addr)	1✔
374	if err != nil {	1✔
375	unlockOutputs()	×
376		×
377	return nil, err	×
378	}	×
379
380	txOuts = append(txOuts, &wire.TxOut{	1✔
381	PkScript: pkScript,	1✔
382	Value: int64(d.Amt),	1✔
383	})	1✔
384	}
385
386	// Next, we'll convert the change addr to a pkScript that we can use
387	// to create the sweep transaction.
388	changePkScript, err := txscript.PayToAddrScript(changeAddr)	1✔
389	if err != nil {	1✔
390	unlockOutputs()	×
391		×
392	return nil, err	×
393	}	×
394
395	// Finally, we'll ask the sweeper to craft a sweep transaction which
396	// respects our fee preference and targets all the UTXOs of the wallet.
397	sweepTx, _, err := createSweepTx(	1✔
398	inputsToSweep, txOuts, changePkScript, blockHeight,	1✔
399	feeRate, maxFeeRate, signer,	1✔
400	)	1✔
401	if err != nil {	1✔
402	unlockOutputs()	×
403		×
404	return nil, err	×
405	}	×
406
407	return &WalletSweepPackage{	1✔
408	SweepTx: sweepTx,	1✔
409	CancelSweepAttempt: unlockOutputs,	1✔
410	}, nil	1✔
411	}
412
413	// fetchUtxosFromOutpoints returns UTXOs for given outpoints. Errors if any
414	// outpoint is not in the passed slice of utxos.
415	func fetchUtxosFromOutpoints(utxos []*lnwallet.Utxo,
416	outpoints []wire.OutPoint) ([]*lnwallet.Utxo, error) {	1✔
417		1✔
418	lookup := fn.SliceToMap(utxos, func(utxo *lnwallet.Utxo) wire.OutPoint {	2✔
419	return utxo.OutPoint	1✔
420	}, func(utxo lnwallet.Utxo) lnwallet.Utxo {	2✔
421	return utxo	1✔
422	})	1✔
423
424	subMap, err := fn.NewSubMap(lookup, outpoints)	1✔
425	if err != nil {	1✔
UNCOV 426	return nil, fmt.Errorf("%w: %v", ErrUnknownUTXO, err.Error())	×
UNCOV 427	}	×
428
429	fetchedUtxos := slices.Collect(maps.Values(subMap))	1✔
430		1✔
431	return fetchedUtxos, nil	1✔
432	}

lightningnetwork / lnd / 15838907453

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