14000719599

Committed 21 Mar 2025 08:54PM UTC coverage: 58.717% (-10.3%) from 68.989%

Build # 14000719599

Build Type

Pull #8754

github

Committed by

web-flow

Commit Message

Merge 29f363f18 into 5235f3b24

Pull Request Pull Request #8754: Add `Outbound` Remote Signer implementation

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72.98

/lnwallet/btcwallet/btcwallet.go

package btcwallet

import (
        "bytes"
        "encoding/hex"
        "errors"
        "fmt"
        "math"
        "sync"
        "time"

        "github.com/btcsuite/btcd/btcec/v2"
        "github.com/btcsuite/btcd/btcutil"
        "github.com/btcsuite/btcd/btcutil/hdkeychain"
        "github.com/btcsuite/btcd/chaincfg"
        "github.com/btcsuite/btcd/chaincfg/chainhash"
        "github.com/btcsuite/btcd/rpcclient"
        "github.com/btcsuite/btcd/txscript"
        "github.com/btcsuite/btcd/wire"
        "github.com/btcsuite/btcwallet/chain"
        "github.com/btcsuite/btcwallet/waddrmgr"
        "github.com/btcsuite/btcwallet/wallet"
        base "github.com/btcsuite/btcwallet/wallet"
        "github.com/btcsuite/btcwallet/wallet/txauthor"
        "github.com/btcsuite/btcwallet/wallet/txrules"
        "github.com/btcsuite/btcwallet/walletdb"
        "github.com/btcsuite/btcwallet/wtxmgr"
        "github.com/davecgh/go-spew/spew"
        "github.com/lightningnetwork/lnd/blockcache"
        "github.com/lightningnetwork/lnd/fn/v2"
        "github.com/lightningnetwork/lnd/input"
        "github.com/lightningnetwork/lnd/keychain"
        "github.com/lightningnetwork/lnd/kvdb"
        "github.com/lightningnetwork/lnd/lnwallet"
        "github.com/lightningnetwork/lnd/lnwallet/chainfee"
)

const (
        defaultAccount  = uint32(waddrmgr.DefaultAccountNum)
        importedAccount = uint32(waddrmgr.ImportedAddrAccount)

        // dryRunImportAccountNumAddrs represents the number of addresses we'll
        // derive for an imported account's external and internal branch when a
        // dry run is attempted.
        dryRunImportAccountNumAddrs = 5

        // UnconfirmedHeight is the special case end height that is used to
        // obtain unconfirmed transactions from ListTransactionDetails.
        UnconfirmedHeight int32 = -1

        // walletMetaBucket is used to store wallet metadata.
        walletMetaBucket = "lnwallet"

        // walletReadyKey is used to indicate that the wallet has been
        // initialized.
        walletReadyKey = "ready"
)

var (
        // lightningAddrSchema is the scope addr schema for all keys that we
        // derive. We'll treat them all as p2wkh addresses, as atm we must
        // specify a particular type.
        lightningAddrSchema = waddrmgr.ScopeAddrSchema{
                ExternalAddrType: waddrmgr.WitnessPubKey,
                InternalAddrType: waddrmgr.WitnessPubKey,
        }

        // LndDefaultKeyScopes is the list of default key scopes that lnd adds
        // to its wallet.
        LndDefaultKeyScopes = []waddrmgr.KeyScope{
                waddrmgr.KeyScopeBIP0049Plus,
                waddrmgr.KeyScopeBIP0084,
                waddrmgr.KeyScopeBIP0086,
        }

        // errNoImportedAddrGen is an error returned when a new address is
        // requested for the default imported account within the wallet.
        errNoImportedAddrGen = errors.New("addresses cannot be generated for " +
                "the default imported account")
)

// BtcWallet is an implementation of the lnwallet.WalletController interface
// backed by an active instance of btcwallet. At the time of the writing of
// this documentation, this implementation requires a full btcd node to
// operate.
type BtcWallet struct {
        // wallet is an active instance of btcwallet.
        wallet *base.Wallet

        chain chain.Interface

        db walletdb.DB

        cfg *Config

        netParams *chaincfg.Params

        chainKeyScope waddrmgr.KeyScope

        blockCache *blockcache.BlockCache

        *input.MusigSessionManager
}

// A compile time check to ensure that BtcWallet implements the
// WalletController and BlockChainIO interfaces.
var _ lnwallet.WalletController = (*BtcWallet)(nil)
var _ lnwallet.BlockChainIO = (*BtcWallet)(nil)

// New returns a new fully initialized instance of BtcWallet given a valid
// configuration struct.
func New(cfg Config, blockCache *blockcache.BlockCache) (*BtcWallet, error) {
        // Create the key scope for the coin type being managed by this wallet.
        chainKeyScope := waddrmgr.KeyScope{
                Purpose: keychain.BIP0043Purpose,
                Coin:    cfg.CoinType,
        }

        // Maybe the wallet has already been opened and unlocked by the
        // WalletUnlocker. So if we get a non-nil value from the config,
        // we assume everything is in order.
        var wallet = cfg.Wallet
        if wallet == nil {
                // No ready wallet was passed, so try to open an existing one.
                var pubPass []byte
                if cfg.PublicPass == nil {
                        pubPass = defaultPubPassphrase
                } else {
                        pubPass = cfg.PublicPass
                }

                loader, err := NewWalletLoader(
                        cfg.NetParams, cfg.RecoveryWindow, cfg.LoaderOptions...,
                )
                if err != nil {
                        return nil, err
                }
                walletExists, err := loader.WalletExists()
                if err != nil {
                        return nil, err
                }

                if !walletExists {
                        // Wallet has never been created, perform initial
                        // set up.
                        wallet, err = loader.CreateNewWallet(
                                pubPass, cfg.PrivatePass, cfg.HdSeed,
                                cfg.Birthday,
                        )
                        if err != nil {
                                return nil, err
                        }
                } else {
                        // Wallet has been created and been initialized at
                        // this point, open it along with all the required DB
                        // namespaces, and the DB itself.
                        wallet, err = loader.OpenExistingWallet(pubPass, false)
                        if err != nil {
                                return nil, err
                        }
                }
        }

        finalWallet := &BtcWallet{
                cfg:           &cfg,
                wallet:        wallet,
                db:            wallet.Database(),
                chain:         cfg.ChainSource,
                netParams:     cfg.NetParams,
                chainKeyScope: chainKeyScope,
                blockCache:    blockCache,
        }

        finalWallet.MusigSessionManager = input.NewMusigSessionManager(
                finalWallet.fetchPrivKey,
        )

        return finalWallet, nil
}

// loaderCfg holds optional wallet loader configuration.
type loaderCfg struct {
        dbDirPath      string
        noFreelistSync bool
        dbTimeout      time.Duration
        useLocalDB     bool
        externalDB     kvdb.Backend
}

// LoaderOption is a functional option to update the optional loader config.
type LoaderOption func(*loaderCfg)

// LoaderWithLocalWalletDB configures the wallet loader to use the local db.
func LoaderWithLocalWalletDB(dbDirPath string, noFreelistSync bool,
        dbTimeout time.Duration) LoaderOption {

        return func(cfg *loaderCfg) {
                cfg.dbDirPath = dbDirPath
                cfg.noFreelistSync = noFreelistSync
                cfg.dbTimeout = dbTimeout
                cfg.useLocalDB = true
        }
}

// LoaderWithExternalWalletDB configures the wallet loadr to use an external db.
func LoaderWithExternalWalletDB(db kvdb.Backend) LoaderOption {
        return func(cfg *loaderCfg) {
                cfg.externalDB = db
        }
}

// NewWalletLoader constructs a wallet loader.
func NewWalletLoader(chainParams *chaincfg.Params, recoveryWindow uint32,
        opts ...LoaderOption) (*base.Loader, error) {

        cfg := &loaderCfg{}

        // Apply all functional options.
        for _, o := range opts {
                o(cfg)
        }

        if cfg.externalDB != nil && cfg.useLocalDB {
                return nil, fmt.Errorf("wallet can either be in the local or " +
                        "an external db")
        }

        if cfg.externalDB != nil {
                loader, err := base.NewLoaderWithDB(
                        chainParams, recoveryWindow, cfg.externalDB,
                        func() (bool, error) {
                                return externalWalletExists(cfg.externalDB)
                        },
                )
                if err != nil {
                        return nil, err
                }

                // Decorate wallet db with out own key such that we
                // can always check whether the wallet exists or not.
                loader.OnWalletCreated(onWalletCreated)
                return loader, nil
        }

        return base.NewLoader(
                chainParams, cfg.dbDirPath, cfg.noFreelistSync,
                cfg.dbTimeout, recoveryWindow,
        ), nil
}

// externalWalletExists is a helper function that we use to template btcwallet's
// Loader in order to be able check if the wallet database has been initialized
// in an external DB.
func externalWalletExists(db kvdb.Backend) (bool, error) {
        exists := false
        err := kvdb.View(db, func(tx kvdb.RTx) error {
                metaBucket := tx.ReadBucket([]byte(walletMetaBucket))
                if metaBucket != nil {
                        walletReady := metaBucket.Get([]byte(walletReadyKey))
                        exists = string(walletReady) == walletReadyKey
                }

                return nil
        }, func() {})

        return exists, err
}

// onWalletCreated is executed when btcwallet creates the wallet the first time.
func onWalletCreated(tx kvdb.RwTx) error {
        metaBucket, err := tx.CreateTopLevelBucket([]byte(walletMetaBucket))
        if err != nil {
                return err
        }

        return metaBucket.Put([]byte(walletReadyKey), []byte(walletReadyKey))
}

// BackEnd returns the underlying ChainService's name as a string.
//
// This is a part of the WalletController interface.
func (b *BtcWallet) BackEnd() string {
        if b.chain != nil {
                return b.chain.BackEnd()
        }

        return ""
}

// InternalWallet returns a pointer to the internal base wallet which is the
// core of btcwallet.
func (b *BtcWallet) InternalWallet() *base.Wallet {
        return b.wallet
}

// Start initializes the underlying rpc connection, the wallet itself, and
// begins syncing to the current available blockchain state.
//
// This is a part of the WalletController interface.
func (b *BtcWallet) Start() error {
        // Is the wallet (according to its database) currently watch-only
        // already? If it is, we won't need to convert it later.
        walletIsWatchOnly := b.wallet.Manager.WatchOnly()

        // If the wallet is watch-only, but we don't expect it to be, then we
        // are in an unexpected state and cannot continue.
        if walletIsWatchOnly && !b.cfg.WatchOnly {
                return fmt.Errorf("wallet is watch-only but we expect it " +
                        "not to be; check if remote signing was disabled by " +
                        "accident")
        }

        // We'll start by unlocking the wallet and ensuring that the KeyScope:
        // (1017, 1) exists within the internal waddrmgr. We'll need this in
        // order to properly generate the keys required for signing various
        // contracts. If this is a watch-only wallet, we don't have any private
        // keys and therefore unlocking is not necessary.
        if !walletIsWatchOnly {
                if err := b.wallet.Unlock(b.cfg.PrivatePass, nil); err != nil {
                        return err
                }

                // If the wallet isn't about to be converted, we need to inform
                // the user that this wallet still contains all private key
                // material and that they need to migrate the existing wallet.
                if b.cfg.WatchOnly && !b.cfg.MigrateWatchOnly {
                        log.Warnf("Wallet is expected to be in watch-only " +
                                "mode but hasn't been migrated to watch-only " +
                                "yet, it still contains private keys; " +
                                "consider turning on the watch-only wallet " +
                                "migration in remote signing mode")
                }
        }

        // Because we might add new "default" key scopes over time, they are
        // created correctly for new wallets. Existing wallets don't
        // automatically add them, we need to do that manually now.
        for _, scope := range LndDefaultKeyScopes {
                _, err := b.wallet.Manager.FetchScopedKeyManager(scope)
                if waddrmgr.IsError(err, waddrmgr.ErrScopeNotFound) {
                        // The default scope wasn't found, that probably means
                        // it was added recently and older wallets don't know it
                        // yet. Let's add it now.
                        addrSchema := waddrmgr.ScopeAddrMap[scope]
                        _, err := b.wallet.AddScopeManager(scope, addrSchema)
                        if err != nil {
                                return err
                        }
                }
        }

        scope, err := b.wallet.Manager.FetchScopedKeyManager(b.chainKeyScope)
        if err != nil {
                // If the scope hasn't yet been created (it wouldn't been
                // loaded by default if it was), then we'll manually create the
                // scope for the first time ourselves.
                manager, err := b.wallet.AddScopeManager(
                        b.chainKeyScope, lightningAddrSchema,
                )
                if err != nil {
                        return err
                }

                scope = manager
        }

        // If the wallet is not watch-only atm, and the user wants to migrate it
        // to watch-only, we will set `convertToWatchOnly` to true so the wallet
        // accounts are created and converted.
        convertToWatchOnly := !walletIsWatchOnly && b.cfg.WatchOnly &&
                b.cfg.MigrateWatchOnly

        // Now that the wallet is unlocked, we'll go ahead and make sure we
        // create accounts for all the key families we're going to use. This
        // will make it possible to list all the account/family xpubs in the
        // wallet list RPC.
        err = b.wallet.InitAccounts(scope, convertToWatchOnly, 255)
        if err != nil {
                return err
        }

        // Establish an RPC connection in addition to starting the goroutines
        // in the underlying wallet.
        if err := b.chain.Start(); err != nil {
                return err
        }

        // Start the underlying btcwallet core.
        b.wallet.Start()

        // Pass the rpc client into the wallet so it can sync up to the
        // current main chain.
        b.wallet.SynchronizeRPC(b.chain)

        return nil
}

// Stop signals the wallet for shutdown. Shutdown may entail closing
// any active sockets, database handles, stopping goroutines, etc.
//
// This is a part of the WalletController interface.
func (b *BtcWallet) Stop() error {
        b.wallet.Stop()

        b.wallet.WaitForShutdown()

        b.chain.Stop()

        return nil
}

// ReadySignal currently signals that the wallet is ready instantly.
func (b *BtcWallet) ReadySignal() chan error {
        readyChan := make(chan error, 1)
        readyChan <- nil

        return readyChan
}

// ConfirmedBalance returns the sum of all the wallet's unspent outputs that
// have at least confs confirmations. If confs is set to zero, then all unspent
// outputs, including those currently in the mempool will be included in the
// final sum. The account parameter serves as a filter to retrieve the balance
// for a specific account. When empty, the confirmed balance of all wallet
// accounts is returned.
//
// This is a part of the WalletController interface.
func (b *BtcWallet) ConfirmedBalance(confs int32,
        accountFilter string) (btcutil.Amount, error) {

        var balance btcutil.Amount

        witnessOutputs, err := b.ListUnspentWitness(
                confs, math.MaxInt32, accountFilter,
        )
        if err != nil {
                return 0, err
        }

        for _, witnessOutput := range witnessOutputs {
                balance += witnessOutput.Value
        }

        return balance, nil
}

// keyScopeForAccountAddr determines the appropriate key scope of an account
// based on its name/address type.
func (b *BtcWallet) keyScopeForAccountAddr(accountName string,
        addrType lnwallet.AddressType) (waddrmgr.KeyScope, uint32, error) {

        // Map the requested address type to its key scope.
        var addrKeyScope waddrmgr.KeyScope
        switch addrType {
        case lnwallet.WitnessPubKey:
                addrKeyScope = waddrmgr.KeyScopeBIP0084
        case lnwallet.NestedWitnessPubKey:
                addrKeyScope = waddrmgr.KeyScopeBIP0049Plus
        case lnwallet.TaprootPubkey:
                addrKeyScope = waddrmgr.KeyScopeBIP0086
        default:
                return waddrmgr.KeyScope{}, 0,
                        fmt.Errorf("unknown address type")
        }

        // The default account spans across multiple key scopes, so the
        // requested address type should already be valid for this account.
        if accountName == lnwallet.DefaultAccountName {
                return addrKeyScope, defaultAccount, nil
        }

        // Otherwise, look up the custom account and if it supports the given
        // key scope.
        accountNumber, err := b.wallet.AccountNumber(addrKeyScope, accountName)
        if err != nil {
                return waddrmgr.KeyScope{}, 0, err
        }

        return addrKeyScope, accountNumber, nil
}

// NewAddress returns the next external or internal address for the wallet
// dictated by the value of the `change` parameter. If change is true, then an
// internal address will be returned, otherwise an external address should be
// returned. The account parameter must be non-empty as it determines which
// account the address should be generated from.
//
// This is a part of the WalletController interface.
func (b *BtcWallet) NewAddress(t lnwallet.AddressType, change bool,
        accountName string) (btcutil.Address, error) {

        // Addresses cannot be derived from the catch-all imported accounts.
        if accountName == waddrmgr.ImportedAddrAccountName {
                return nil, errNoImportedAddrGen
        }

        keyScope, account, err := b.keyScopeForAccountAddr(accountName, t)
        if err != nil {
                return nil, err
        }

        if change {
                return b.wallet.NewChangeAddress(account, keyScope)
        }
        return b.wallet.NewAddress(account, keyScope)
}

// LastUnusedAddress returns the last *unused* address known by the wallet. An
// address is unused if it hasn't received any payments. This can be useful in
// UIs in order to continually show the "freshest" address without having to
// worry about "address inflation" caused by continual refreshing. Similar to
// NewAddress it can derive a specified address type, and also optionally a
// change address. The account parameter must be non-empty as it determines
// which account the address should be generated from.
func (b *BtcWallet) LastUnusedAddress(addrType lnwallet.AddressType,
        accountName string) (btcutil.Address, error) {

        // Addresses cannot be derived from the catch-all imported accounts.
        if accountName == waddrmgr.ImportedAddrAccountName {
                return nil, errNoImportedAddrGen
        }

        keyScope, account, err := b.keyScopeForAccountAddr(accountName, addrType)
        if err != nil {
                return nil, err
        }

        return b.wallet.CurrentAddress(account, keyScope)
}

// IsOurAddress checks if the passed address belongs to this wallet
//
// This is a part of the WalletController interface.
func (b *BtcWallet) IsOurAddress(a btcutil.Address) bool {
        result, err := b.wallet.HaveAddress(a)
        return result && (err == nil)
}

// AddressInfo returns the information about an address, if it's known to this
// wallet.
//
// NOTE: This is a part of the WalletController interface.
func (b *BtcWallet) AddressInfo(a btcutil.Address) (waddrmgr.ManagedAddress,
        error) {

        return b.wallet.AddressInfo(a)
}

// ListAccounts retrieves all accounts belonging to the wallet by default. A
// name and key scope filter can be provided to filter through all of the wallet
// accounts and return only those matching.
//
// This is a part of the WalletController interface.
func (b *BtcWallet) ListAccounts(name string,
        keyScope *waddrmgr.KeyScope) ([]*waddrmgr.AccountProperties, error) {

        var res []*waddrmgr.AccountProperties
        switch {
        // If both the name and key scope filters were provided, we'll return
        // the existing account matching those.
        case name != "" && keyScope != nil:
                account, err := b.wallet.AccountPropertiesByName(*keyScope, name)
                if err != nil {
                        return nil, err
                }
                res = append(res, account)

        // Only the name filter was provided.
        case name != "" && keyScope == nil:
                // If the name corresponds to the default or imported accounts,
                // we'll return them for all our supported key scopes.
                if name == lnwallet.DefaultAccountName ||
                        name == waddrmgr.ImportedAddrAccountName {

                        for _, defaultScope := range LndDefaultKeyScopes {
                                a, err := b.wallet.AccountPropertiesByName(
                                        defaultScope, name,
                                )
                                if err != nil {
                                        return nil, err
                                }
                                res = append(res, a)
                        }

                        break
                }

                // In theory, there should be only one custom account for the
                // given name. However, due to a lack of check, users could
                // create custom accounts with various key scopes. This
                // behaviour has been fixed but, we return all potential custom
                // accounts with the given name.
                for _, scope := range waddrmgr.DefaultKeyScopes {
                        a, err := b.wallet.AccountPropertiesByName(
                                scope, name,
                        )
                        switch {
                        case waddrmgr.IsError(err, waddrmgr.ErrAccountNotFound):
                                continue

                        // In the specific case of a wallet initialized only by
                        // importing account xpubs (watch only wallets), it is
                        // possible that some keyscopes will be 'unknown' by the
                        // wallet (depending on the xpubs given to initialize
                        // it). If the keyscope is not found, just skip it.
                        case waddrmgr.IsError(err, waddrmgr.ErrScopeNotFound):
                                continue

                        case err != nil:
                                return nil, err
                        }

                        res = append(res, a)
                }
                if len(res) == 0 {
                        return nil, newAccountNotFoundError(name)
                }

        // Only the key scope filter was provided, so we'll return all accounts
        // matching it.
        case name == "" && keyScope != nil:
                accounts, err := b.wallet.Accounts(*keyScope)
                if err != nil {
                        return nil, err
                }
                for _, account := range accounts.Accounts {
                        account := account
                        res = append(res, &account.AccountProperties)
                }

        // Neither of the filters were provided, so return all accounts for our
        // supported key scopes.
        case name == "" && keyScope == nil:
                for _, defaultScope := range LndDefaultKeyScopes {
                        accounts, err := b.wallet.Accounts(defaultScope)
                        if err != nil {
                                return nil, err
                        }
                        for _, account := range accounts.Accounts {
                                account := account
                                res = append(res, &account.AccountProperties)
                        }
                }

                accounts, err := b.wallet.Accounts(waddrmgr.KeyScope{
                        Purpose: keychain.BIP0043Purpose,
                        Coin:    b.cfg.CoinType,
                })
                if err != nil {
                        return nil, err
                }
                for _, account := range accounts.Accounts {
                        account := account
                        res = append(res, &account.AccountProperties)
                }
        }

        return res, nil
}

// newAccountNotFoundError returns an error indicating that the manager didn't
// find the specific account. This error is used to be compatible with the old
// 'LookupAccount' behaviour previously used.
func newAccountNotFoundError(name string) error {
        str := fmt.Sprintf("account name '%s' not found", name)

        return waddrmgr.ManagerError{
                ErrorCode:   waddrmgr.ErrAccountNotFound,
                Description: str,
        }
}

// RequiredReserve returns the minimum amount of satoshis that should be
// kept in the wallet in order to fee bump anchor channels if necessary.
// The value scales with the number of public anchor channels but is
// capped at a maximum.
func (b *BtcWallet) RequiredReserve(
        numAnchorChans uint32) btcutil.Amount {

        anchorChanReservedValue := lnwallet.AnchorChanReservedValue
        reserved := btcutil.Amount(numAnchorChans) * anchorChanReservedValue
        if reserved > lnwallet.MaxAnchorChanReservedValue {
                reserved = lnwallet.MaxAnchorChanReservedValue
        }

        return reserved
}

// ListAddresses retrieves all the addresses along with their balance. An
// account name filter can be provided to filter through all of the
// wallet accounts and return the addresses of only those matching.
//
// This is a part of the WalletController interface.
func (b *BtcWallet) ListAddresses(name string,
        showCustomAccounts bool) (lnwallet.AccountAddressMap, error) {

        accounts, err := b.ListAccounts(name, nil)
        if err != nil {
                return nil, err
        }

        addresses := make(lnwallet.AccountAddressMap)
        addressBalance := make(map[string]btcutil.Amount)

        // Retrieve all the unspent ouputs.
        outputs, err := b.wallet.ListUnspent(0, math.MaxInt32, "")
        if err != nil {
                return nil, err
        }

        // Calculate the total balance of each address.
        for _, output := range outputs {
                amount, err := btcutil.NewAmount(output.Amount)
                if err != nil {
                        return nil, err
                }

                addressBalance[output.Address] += amount
        }

        for _, accntDetails := range accounts {
                accntScope := accntDetails.KeyScope
                managedAddrs, err := b.wallet.AccountManagedAddresses(
                        accntDetails.KeyScope, accntDetails.AccountNumber,
                )
                if err != nil {
                        return nil, err
                }

                // Only consider those accounts which have addresses.
                if len(managedAddrs) == 0 {
                        continue
                }

                // All the lnd internal/custom keys for channels and other
                // functionality are derived from the same scope. Since they
                // aren't really used as addresses and will never have an
                // on-chain balance, we'll want to show the public key instead.
                isLndCustom := accntScope.Purpose == keychain.BIP0043Purpose
                addressProperties := make(
                        []lnwallet.AddressProperty, len(managedAddrs),
                )

                for idx, managedAddr := range managedAddrs {
                        addr := managedAddr.Address()
                        addressString := addr.String()

                        // Hex-encode the compressed public key for custom lnd
                        // keys, addresses don't make a lot of sense.
                        var (
                                pubKey         *btcec.PublicKey
                                derivationPath string
                        )
                        pka, ok := managedAddr.(waddrmgr.ManagedPubKeyAddress)
                        if ok {
                                pubKey = pka.PubKey()

                                // There can be an error in two cases: Either
                                // the address isn't a managed pubkey address,
                                // which we already checked above, or the
                                // address is imported in which case we don't
                                // know the derivation path, and it will just be
                                // empty anyway.
                                _, _, derivationPath, _ =
                                        Bip32DerivationFromAddress(pka)
                        }
                        if pubKey != nil && isLndCustom {
                                addressString = hex.EncodeToString(
                                        pubKey.SerializeCompressed(),
                                )
                        }

                        addressProperties[idx] = lnwallet.AddressProperty{
                                Address:        addressString,
                                Internal:       managedAddr.Internal(),
                                Balance:        addressBalance[addressString],
                                PublicKey:      pubKey,
                                DerivationPath: derivationPath,
                        }
                }

                if accntScope.Purpose != keychain.BIP0043Purpose ||
                        showCustomAccounts {

                        addresses[accntDetails] = addressProperties
                }
        }

        return addresses, nil
}

// ImportAccount imports an account backed by an account extended public key.
// The master key fingerprint denotes the fingerprint of the root key
// corresponding to the account public key (also known as the key with
// derivation path m/). This may be required by some hardware wallets for proper
// identification and signing.
//
// The address type can usually be inferred from the key's version, but may be
// required for certain keys to map them into the proper scope.
//
// For custom accounts, we will first check if there is no account with the same
// name (even with a different key scope). No custom account should have various
// key scopes as it will result in non-deterministic behaviour.
//
// For BIP-0044 keys, an address type must be specified as we intend to not
// support importing BIP-0044 keys into the wallet using the legacy
// pay-to-pubkey-hash (P2PKH) scheme. A nested witness address type will force
// the standard BIP-0049 derivation scheme, while a witness address type will
// force the standard BIP-0084 derivation scheme.
//
// For BIP-0049 keys, an address type must also be specified to make a
// distinction between the standard BIP-0049 address schema (nested witness
// pubkeys everywhere) and our own BIP-0049Plus address schema (nested pubkeys
// externally, witness pubkeys internally).
//
// This is a part of the WalletController interface.
func (b *BtcWallet) ImportAccount(name string, accountPubKey *hdkeychain.ExtendedKey,
        masterKeyFingerprint uint32, addrType *waddrmgr.AddressType,
        dryRun bool) (*waddrmgr.AccountProperties, []btcutil.Address,
        []btcutil.Address, error) {

        // For custom accounts, we first check if there is no existing account
        // with the same name.
        if name != lnwallet.DefaultAccountName &&
                name != waddrmgr.ImportedAddrAccountName {

                _, err := b.ListAccounts(name, nil)
                if err == nil {
                        return nil, nil, nil,
                                fmt.Errorf("account '%s' already exists",
                                        name)
                }
                if !waddrmgr.IsError(err, waddrmgr.ErrAccountNotFound) {
                        return nil, nil, nil, err
                }
        }

        if !dryRun {
                accountProps, err := b.wallet.ImportAccount(
                        name, accountPubKey, masterKeyFingerprint, addrType,
                )
                if err != nil {
                        return nil, nil, nil, err
                }
                return accountProps, nil, nil, nil
        }

        // Derive addresses from both the external and internal branches of the
        // account. There's no risk of address inflation as this is only done
        // for dry runs.
        accountProps, extAddrs, intAddrs, err := b.wallet.ImportAccountDryRun(
                name, accountPubKey, masterKeyFingerprint, addrType,
                dryRunImportAccountNumAddrs,
        )
        if err != nil {
                return nil, nil, nil, err
        }

        externalAddrs := make([]btcutil.Address, len(extAddrs))
        for i := 0; i < len(extAddrs); i++ {
                externalAddrs[i] = extAddrs[i].Address()
        }

        internalAddrs := make([]btcutil.Address, len(intAddrs))
        for i := 0; i < len(intAddrs); i++ {
                internalAddrs[i] = intAddrs[i].Address()
        }

        return accountProps, externalAddrs, internalAddrs, nil
}

// ImportPublicKey imports a single derived public key into the wallet. The
// address type can usually be inferred from the key's version, but in the case
// of legacy versions (xpub, tpub), an address type must be specified as we
// intend to not support importing BIP-44 keys into the wallet using the legacy
// pay-to-pubkey-hash (P2PKH) scheme.
//
// This is a part of the WalletController interface.
func (b *BtcWallet) ImportPublicKey(pubKey *btcec.PublicKey,
        addrType waddrmgr.AddressType) error {

        return b.wallet.ImportPublicKey(pubKey, addrType)
}

// ImportTaprootScript imports a user-provided taproot script into the address
// manager. The imported script will act as a pay-to-taproot address.
func (b *BtcWallet) ImportTaprootScript(scope waddrmgr.KeyScope,
        tapscript *waddrmgr.Tapscript) (waddrmgr.ManagedAddress, error) {

        // We want to be able to import script addresses into a watch-only
        // wallet, which is only possible if we don't encrypt the script with
        // the private key encryption key. By specifying the script as being
        // "not secret", we can also decrypt the script in a watch-only wallet.
        const isSecretScript = false

        // Currently, only v1 (Taproot) scripts are supported. We don't even
        // know what a v2 witness version would look like at this point.
        const witnessVersionTaproot byte = 1

        return b.wallet.ImportTaprootScript(
                scope, tapscript, nil, witnessVersionTaproot, isSecretScript,
        )
}

// SendOutputs funds, signs, and broadcasts a Bitcoin transaction paying out to
// the specified outputs. In the case the wallet has insufficient funds, or the
// outputs are non-standard, a non-nil error will be returned.
//
// NOTE: This method requires the global coin selection lock to be held.
//
// This is a part of the WalletController interface.
func (b *BtcWallet) SendOutputs(inputs fn.Set[wire.OutPoint],
        outputs []*wire.TxOut, feeRate chainfee.SatPerKWeight,
        minConfs int32, label string,
        strategy base.CoinSelectionStrategy) (*wire.MsgTx, error) {

        // Convert our fee rate from sat/kw to sat/kb since it's required by
        // SendOutputs.
        feeSatPerKB := btcutil.Amount(feeRate.FeePerKVByte())

        // Sanity check outputs.
        if len(outputs) < 1 {
                return nil, lnwallet.ErrNoOutputs
        }

        // Sanity check minConfs.
        if minConfs < 0 {
                return nil, lnwallet.ErrInvalidMinconf
        }

        // Use selected UTXOs if specified, otherwise default selection.
        if len(inputs) != 0 {
                return b.wallet.SendOutputsWithInput(
                        outputs, nil, defaultAccount, minConfs, feeSatPerKB,
                        strategy, label, inputs.ToSlice(),
                )
        }

        return b.wallet.SendOutputs(
                outputs, nil, defaultAccount, minConfs, feeSatPerKB,
                strategy, label,
        )
}

// CreateSimpleTx creates a Bitcoin transaction paying to the specified
// outputs. The transaction is not broadcasted to the network, but a new change
// address might be created in the wallet database. In the case the wallet has
// insufficient funds, or the outputs are non-standard, an error should be
// returned. This method also takes the target fee expressed in sat/kw that
// should be used when crafting the transaction.
//
// NOTE: The dryRun argument can be set true to create a tx that doesn't alter
// the database. A tx created with this set to true SHOULD NOT be broadcasted.
//
// NOTE: This method requires the global coin selection lock to be held.
//
// This is a part of the WalletController interface.
func (b *BtcWallet) CreateSimpleTx(inputs fn.Set[wire.OutPoint],
        outputs []*wire.TxOut, feeRate chainfee.SatPerKWeight, minConfs int32,
        strategy base.CoinSelectionStrategy, dryRun bool) (
        *txauthor.AuthoredTx, error) {

        // The fee rate is passed in using units of sat/kw, so we'll convert
        // this to sat/KB as the CreateSimpleTx method requires this unit.
        feeSatPerKB := btcutil.Amount(feeRate.FeePerKVByte())

        // Sanity check outputs.
        if len(outputs) < 1 {
                return nil, lnwallet.ErrNoOutputs
        }

        // Sanity check minConfs.
        if minConfs < 0 {
                return nil, lnwallet.ErrInvalidMinconf
        }

        for _, output := range outputs {
                // When checking an output for things like dusty-ness, we'll
                // use the default mempool relay fee rather than the target
                // effective fee rate to ensure accuracy. Otherwise, we may
                // mistakenly mark small-ish, but not quite dust output as
                // dust.
                err := txrules.CheckOutput(
                        output, txrules.DefaultRelayFeePerKb,
                )
                if err != nil {
                        return nil, err
                }
        }

        // Add the optional inputs to the transaction.
        optFunc := wallet.WithCustomSelectUtxos(inputs.ToSlice())

        return b.wallet.CreateSimpleTx(
                nil, defaultAccount, outputs, minConfs, feeSatPerKB,
                strategy, dryRun, []wallet.TxCreateOption{optFunc}...,
        )
}

// LeaseOutput locks an output to the given ID, preventing it from being
// available for any future coin selection attempts. The absolute time of the
// lock's expiration is returned. The expiration of the lock can be extended by
// successive invocations of this call. Outputs can be unlocked before their
// expiration through `ReleaseOutput`.
//
// If the output is not known, wtxmgr.ErrUnknownOutput is returned. If the
// output has already been locked to a different ID, then
// wtxmgr.ErrOutputAlreadyLocked is returned.
//
// NOTE: This method requires the global coin selection lock to be held.
func (b *BtcWallet) LeaseOutput(id wtxmgr.LockID, op wire.OutPoint,
        duration time.Duration) (time.Time, error) {

        // Make sure we don't attempt to double lock an output that's been
        // locked by the in-memory implementation.
        if b.wallet.LockedOutpoint(op) {
                return time.Time{}, wtxmgr.ErrOutputAlreadyLocked
        }

        lockedUntil, err := b.wallet.LeaseOutput(id, op, duration)
        if err != nil {
                return time.Time{}, err
        }

        return lockedUntil, nil
}

// ListLeasedOutputs returns a list of all currently locked outputs.
func (b *BtcWallet) ListLeasedOutputs() ([]*base.ListLeasedOutputResult,
        error) {

        return b.wallet.ListLeasedOutputs()
}

// ReleaseOutput unlocks an output, allowing it to be available for coin
// selection if it remains unspent. The ID should match the one used to
// originally lock the output.
//
// NOTE: This method requires the global coin selection lock to be held.
func (b *BtcWallet) ReleaseOutput(id wtxmgr.LockID, op wire.OutPoint) error {
        return b.wallet.ReleaseOutput(id, op)
}

// ListUnspentWitness returns all unspent outputs which are version 0 witness
// programs. The 'minConfs' and 'maxConfs' parameters indicate the minimum
// and maximum number of confirmations an output needs in order to be returned
// by this method. Passing -1 as 'minConfs' indicates that even unconfirmed
// outputs should be returned. Using MaxInt32 as 'maxConfs' implies returning
// all outputs with at least 'minConfs'. The account parameter serves as a
// filter to retrieve the unspent outputs for a specific account.  When empty,
// the unspent outputs of all wallet accounts are returned.
//
// NOTE: This method requires the global coin selection lock to be held.
//
// This is a part of the WalletController interface.
func (b *BtcWallet) ListUnspentWitness(minConfs, maxConfs int32,
        accountFilter string) ([]*lnwallet.Utxo, error) {

        // First, grab all the unfiltered currently unspent outputs.
        unspentOutputs, err := b.wallet.ListUnspent(
                minConfs, maxConfs, accountFilter,
        )
        if err != nil {
                return nil, err
        }

        // Next, we'll run through all the regular outputs, only saving those
        // which are p2wkh outputs or a p2wsh output nested within a p2sh output.
        witnessOutputs := make([]*lnwallet.Utxo, 0, len(unspentOutputs))
        for _, output := range unspentOutputs {
                pkScript, err := hex.DecodeString(output.ScriptPubKey)
                if err != nil {
                        return nil, err
                }

                addressType := lnwallet.UnknownAddressType
                if txscript.IsPayToWitnessPubKeyHash(pkScript) {
                        addressType = lnwallet.WitnessPubKey
                } else if txscript.IsPayToScriptHash(pkScript) {
                        // TODO(roasbeef): This assumes all p2sh outputs returned by the
                        // wallet are nested p2pkh. We can't check the redeem script because
                        // the btcwallet service does not include it.
                        addressType = lnwallet.NestedWitnessPubKey
                } else if txscript.IsPayToTaproot(pkScript) {
                        addressType = lnwallet.TaprootPubkey
                }

                if addressType == lnwallet.WitnessPubKey ||
                        addressType == lnwallet.NestedWitnessPubKey ||
                        addressType == lnwallet.TaprootPubkey {

                        txid, err := chainhash.NewHashFromStr(output.TxID)
                        if err != nil {
                                return nil, err
                        }

                        // We'll ensure we properly convert the amount given in
                        // BTC to satoshis.
                        amt, err := btcutil.NewAmount(output.Amount)
                        if err != nil {
                                return nil, err
                        }

                        utxo := &lnwallet.Utxo{
                                AddressType: addressType,
                                Value:       amt,
                                PkScript:    pkScript,
                                OutPoint: wire.OutPoint{
                                        Hash:  *txid,
                                        Index: output.Vout,
                                },
                                Confirmations: output.Confirmations,
                        }
                        witnessOutputs = append(witnessOutputs, utxo)
                }

        }

        return witnessOutputs, nil
}

// mapRpcclientError maps an error from the `btcwallet/chain` package to
// defined error in this package.
//
// NOTE: we are mapping the errors returned from `sendrawtransaction` RPC or
// the reject reason from `testmempoolaccept` RPC.
func mapRpcclientError(err error) error {
        // If we failed to publish the transaction, check whether we got an
        // error of known type.
        switch {
        // If the wallet reports a double spend, convert it to our internal
        // ErrDoubleSpend and return.
        case errors.Is(err, chain.ErrMempoolConflict),
                errors.Is(err, chain.ErrMissingInputs),
                errors.Is(err, chain.ErrTxAlreadyKnown),
                errors.Is(err, chain.ErrTxAlreadyConfirmed):

                return lnwallet.ErrDoubleSpend

        // If the wallet reports that fee requirements for accepting the tx
        // into mempool are not met, convert it to our internal ErrMempoolFee
        // and return.
        case errors.Is(err, chain.ErrMempoolMinFeeNotMet):
                return fmt.Errorf("%w: %v", lnwallet.ErrMempoolFee, err.Error())
        }

        return err
}

// PublishTransaction performs cursory validation (dust checks, etc), then
// finally broadcasts the passed transaction to the Bitcoin network. If
// publishing the transaction fails, an error describing the reason is returned
// and mapped to the wallet's internal error types. If the transaction is
// already published to the network (either in the mempool or chain) no error
// will be returned.
func (b *BtcWallet) PublishTransaction(tx *wire.MsgTx, label string) error {
        // For neutrino backend there's no mempool, so we return early by
        // publishing the transaction.
        if b.chain.BackEnd() == "neutrino" {
                err := b.wallet.PublishTransaction(tx, label)

                return mapRpcclientError(err)
        }

        // For non-neutrino nodes, we will first check whether the transaction
        // can be accepted by the mempool.
        // Use a max feerate of 0 means the default value will be used when
        // testing mempool acceptance. The default max feerate is 0.10 BTC/kvb,
        // or 10,000 sat/vb.
        results, err := b.chain.TestMempoolAccept([]*wire.MsgTx{tx}, 0)
        if err != nil {
                // If the chain backend doesn't support the mempool acceptance
                // test RPC, we'll just attempt to publish the transaction.
                if errors.Is(err, rpcclient.ErrBackendVersion) {
                        log.Warnf("TestMempoolAccept not supported by "+
                                "backend, consider upgrading %s to a newer "+
                                "version", b.chain.BackEnd())

                        err := b.wallet.PublishTransaction(tx, label)

                        return mapRpcclientError(err)
                }

                return err
        }

        // Sanity check that the expected single result is returned.
        if len(results) != 1 {
                return fmt.Errorf("expected 1 result from TestMempoolAccept, "+
                        "instead got %v", len(results))
        }

        result := results[0]
        log.Debugf("TestMempoolAccept result: %s", spew.Sdump(result))

        // Once mempool check passed, we can publish the transaction.
        if result.Allowed {
                err = b.wallet.PublishTransaction(tx, label)

                return mapRpcclientError(err)
        }

        // If the check failed, there's no need to publish it. We'll handle the
        // error and return.
        log.Warnf("Transaction %v not accepted by mempool: %v",
                tx.TxHash(), result.RejectReason)

        // We need to use the string to create an error type and map it to a
        // btcwallet error.
        err = b.chain.MapRPCErr(errors.New(result.RejectReason))

        //nolint:ll
        // These two errors are ignored inside `PublishTransaction`:
        // https://github.com/btcsuite/btcwallet/blob/master/wallet/wallet.go#L3763
        // To keep our current behavior, we need to ignore the same errors
        // returned from TestMempoolAccept.
        //
        // TODO(yy): since `LightningWallet.PublishTransaction` always publish
        // the same tx twice, we'd always get ErrTxAlreadyInMempool. We should
        // instead create a new rebroadcaster that monitors the mempool, and
        // only rebroadcast when the tx is evicted. This way we don't need to
        // broadcast twice, and can instead return these errors here.
        switch {
        // NOTE: In addition to ignoring these errors, we need to call
        // `PublishTransaction` again because we need to mark the label in the
        // wallet. We can remove this exception once we have the above TODO
        // fixed.
        case errors.Is(err, chain.ErrTxAlreadyInMempool),
                errors.Is(err, chain.ErrTxAlreadyKnown),
                errors.Is(err, chain.ErrTxAlreadyConfirmed):

                err := b.wallet.PublishTransaction(tx, label)
                return mapRpcclientError(err)
        }

        return mapRpcclientError(err)
}

// LabelTransaction adds a label to a transaction. If the tx already
// has a label, this call will fail unless the overwrite parameter
// is set. Labels must not be empty, and they are limited to 500 chars.
//
// Note: it is part of the WalletController interface.
func (b *BtcWallet) LabelTransaction(hash chainhash.Hash, label string,
        overwrite bool) error {

        return b.wallet.LabelTransaction(hash, label, overwrite)
}

// extractBalanceDelta extracts the net balance delta from the PoV of the
// wallet given a TransactionSummary.
func extractBalanceDelta(
        txSummary base.TransactionSummary,
        tx *wire.MsgTx,
) (btcutil.Amount, error) {
        // For each input we debit the wallet's outflow for this transaction,
        // and for each output we credit the wallet's inflow for this
        // transaction.
        var balanceDelta btcutil.Amount
        for _, input := range txSummary.MyInputs {
                balanceDelta -= input.PreviousAmount
        }
        for _, output := range txSummary.MyOutputs {
                balanceDelta += btcutil.Amount(tx.TxOut[output.Index].Value)
        }

        return balanceDelta, nil
}

// getPreviousOutpoints is a helper function which gets the previous
// outpoints of a transaction.
func getPreviousOutpoints(wireTx *wire.MsgTx,
        myInputs []base.TransactionSummaryInput) []lnwallet.PreviousOutPoint {

        // isOurOutput is a map containing the output indices
        // controlled by the wallet.
        // Note: We make use of the information in `myInputs` provided
        // by the `wallet.TransactionSummary` structure that holds
        // information only if the input/previous_output is controlled by the wallet.
        isOurOutput := make(map[uint32]bool, len(myInputs))
        for _, myInput := range myInputs {
                isOurOutput[myInput.Index] = true
        }

        previousOutpoints := make([]lnwallet.PreviousOutPoint, len(wireTx.TxIn))
        for idx, txIn := range wireTx.TxIn {
                previousOutpoints[idx] = lnwallet.PreviousOutPoint{
                        OutPoint:    txIn.PreviousOutPoint.String(),
                        IsOurOutput: isOurOutput[uint32(idx)],
                }
        }

        return previousOutpoints
}

// GetTransactionDetails returns details of a transaction given its
// transaction hash.
func (b *BtcWallet) GetTransactionDetails(
        txHash *chainhash.Hash) (*lnwallet.TransactionDetail, error) {

        // Grab the best block the wallet knows of, we'll use this to calculate
        // # of confirmations shortly below.
        bestBlock := b.wallet.Manager.SyncedTo()
        currentHeight := bestBlock.Height
        tx, err := b.wallet.GetTransaction(*txHash)
        if err != nil {
                return nil, err
        }

        // For both confirmed and unconfirmed transactions, create a
        // TransactionDetail which re-packages the data returned by the base
        // wallet.
        if tx.Confirmations > 0 {
                txDetails, err := minedTransactionsToDetails(
                        currentHeight,
                        base.Block{
                                Transactions: []base.TransactionSummary{
                                        tx.Summary,
                                },
                                Hash:      tx.BlockHash,
                                Height:    tx.Height,
                                Timestamp: tx.Summary.Timestamp},
                        b.netParams,
                )
                if err != nil {
                        return nil, err
                }

                return txDetails[0], nil
        }

        return unminedTransactionsToDetail(tx.Summary, b.netParams)
}

// minedTransactionsToDetails is a helper function which converts a summary
// information about mined transactions to a TransactionDetail.
func minedTransactionsToDetails(
        currentHeight int32,
        block base.Block,
        chainParams *chaincfg.Params,
) ([]*lnwallet.TransactionDetail, error) {

        details := make([]*lnwallet.TransactionDetail, 0, len(block.Transactions))
        for _, tx := range block.Transactions {
                wireTx := &wire.MsgTx{}
                txReader := bytes.NewReader(tx.Transaction)

                if err := wireTx.Deserialize(txReader); err != nil {
                        return nil, err
                }

                // isOurAddress is a map containing the output indices
                // controlled by the wallet.
                // Note: We make use of the information in `MyOutputs` provided
                // by the `wallet.TransactionSummary` structure that holds
                // information only if the output is controlled by the wallet.
                isOurAddress := make(map[int]bool, len(tx.MyOutputs))
                for _, o := range tx.MyOutputs {
                        isOurAddress[int(o.Index)] = true
                }

                var outputDetails []lnwallet.OutputDetail
                for i, txOut := range wireTx.TxOut {
                        var addresses []btcutil.Address
                        sc, outAddresses, _, err := txscript.ExtractPkScriptAddrs(
                                txOut.PkScript, chainParams,
                        )
                        if err == nil {
                                // Add supported addresses.
                                addresses = outAddresses
                        }

                        outputDetails = append(outputDetails, lnwallet.OutputDetail{
                                OutputType:   sc,
                                Addresses:    addresses,
                                PkScript:     txOut.PkScript,
                                OutputIndex:  i,
                                Value:        btcutil.Amount(txOut.Value),
                                IsOurAddress: isOurAddress[i],
                        })
                }

                previousOutpoints := getPreviousOutpoints(wireTx, tx.MyInputs)

                txDetail := &lnwallet.TransactionDetail{
                        Hash:              *tx.Hash,
                        NumConfirmations:  currentHeight - block.Height + 1,
                        BlockHash:         block.Hash,
                        BlockHeight:       block.Height,
                        Timestamp:         block.Timestamp,
                        TotalFees:         int64(tx.Fee),
                        OutputDetails:     outputDetails,
                        RawTx:             tx.Transaction,
                        Label:             tx.Label,
                        PreviousOutpoints: previousOutpoints,
                }

                balanceDelta, err := extractBalanceDelta(tx, wireTx)
                if err != nil {
                        return nil, err
                }
                txDetail.Value = balanceDelta

                details = append(details, txDetail)
        }

        return details, nil
}

// unminedTransactionsToDetail is a helper function which converts a summary
// for an unconfirmed transaction to a transaction detail.
func unminedTransactionsToDetail(
        summary base.TransactionSummary,
        chainParams *chaincfg.Params,
) (*lnwallet.TransactionDetail, error) {

        wireTx := &wire.MsgTx{}
        txReader := bytes.NewReader(summary.Transaction)

        if err := wireTx.Deserialize(txReader); err != nil {
                return nil, err
        }

        // isOurAddress is a map containing the output indices controlled by
        // the wallet.
        // Note: We make use of the information in `MyOutputs` provided
        // by the `wallet.TransactionSummary` structure that holds information
        // only if the output is controlled by the wallet.
        isOurAddress := make(map[int]bool, len(summary.MyOutputs))
        for _, o := range summary.MyOutputs {
                isOurAddress[int(o.Index)] = true
        }

        var outputDetails []lnwallet.OutputDetail
        for i, txOut := range wireTx.TxOut {
                var addresses []btcutil.Address
                sc, outAddresses, _, err := txscript.ExtractPkScriptAddrs(
                        txOut.PkScript, chainParams,
                )
                if err == nil {
                        // Add supported addresses.
                        addresses = outAddresses
                }

                outputDetails = append(outputDetails, lnwallet.OutputDetail{
                        OutputType:   sc,
                        Addresses:    addresses,
                        PkScript:     txOut.PkScript,
                        OutputIndex:  i,
                        Value:        btcutil.Amount(txOut.Value),
                        IsOurAddress: isOurAddress[i],
                })
        }

        previousOutpoints := getPreviousOutpoints(wireTx, summary.MyInputs)

        txDetail := &lnwallet.TransactionDetail{
                Hash:              *summary.Hash,
                TotalFees:         int64(summary.Fee),
                Timestamp:         summary.Timestamp,
                OutputDetails:     outputDetails,
                RawTx:             summary.Transaction,
                Label:             summary.Label,
                PreviousOutpoints: previousOutpoints,
        }

        balanceDelta, err := extractBalanceDelta(summary, wireTx)
        if err != nil {
                return nil, err
        }
        txDetail.Value = balanceDelta

        return txDetail, nil
}

// ListTransactionDetails returns a list of all transactions which are relevant
// to the wallet over [startHeight;endHeight]. If start height is greater than
// end height, the transactions will be retrieved in reverse order. To include
// unconfirmed transactions, endHeight should be set to the special value -1.
// This will return transactions from the tip of the chain until the start
// height (inclusive) and unconfirmed transactions. The account parameter serves
// as a filter to retrieve the transactions relevant to a specific account. When
// empty, transactions of all wallet accounts are returned.
//
// This is a part of the WalletController interface.
func (b *BtcWallet) ListTransactionDetails(startHeight, endHeight int32,
        accountFilter string, indexOffset uint32,
        maxTransactions uint32) ([]*lnwallet.TransactionDetail, uint64, uint64,
        error) {

        // Grab the best block the wallet knows of, we'll use this to calculate
        // # of confirmations shortly below.
        bestBlock := b.wallet.Manager.SyncedTo()
        currentHeight := bestBlock.Height

        // We'll attempt to find all transactions from start to end height.
        start := base.NewBlockIdentifierFromHeight(startHeight)
        stop := base.NewBlockIdentifierFromHeight(endHeight)
        txns, err := b.wallet.GetTransactions(start, stop, accountFilter, nil)
        if err != nil {
                return nil, 0, 0, err
        }

        txDetails := make([]*lnwallet.TransactionDetail, 0,
                len(txns.MinedTransactions)+len(txns.UnminedTransactions))

        // For both confirmed and unconfirmed transactions, create a
        // TransactionDetail which re-packages the data returned by the base
        // wallet.
        for _, blockPackage := range txns.MinedTransactions {
                details, err := minedTransactionsToDetails(
                        currentHeight, blockPackage, b.netParams,
                )
                if err != nil {
                        return nil, 0, 0, err
                }

                txDetails = append(txDetails, details...)
        }
        for _, tx := range txns.UnminedTransactions {
                detail, err := unminedTransactionsToDetail(tx, b.netParams)
                if err != nil {
                        return nil, 0, 0, err
                }

                txDetails = append(txDetails, detail)
        }

        // Return empty transaction list, if offset is more than all
        // transactions.
        if int(indexOffset) >= len(txDetails) {
                txDetails = []*lnwallet.TransactionDetail{}

                return txDetails, 0, 0, nil
        }

        end := indexOffset + maxTransactions

        // If maxTransactions is set to 0, then we'll return all transactions
        // starting from the offset.
        if maxTransactions == 0 {
                end = uint32(len(txDetails))
                txDetails = txDetails[indexOffset:end]

                return txDetails, uint64(indexOffset), uint64(end - 1), nil
        }

        if end > uint32(len(txDetails)) {
                end = uint32(len(txDetails))
        }

        txDetails = txDetails[indexOffset:end]

        return txDetails, uint64(indexOffset), uint64(end - 1), nil
}

// txSubscriptionClient encapsulates the transaction notification client from
// the base wallet. Notifications received from the client will be proxied over
// two distinct channels.
type txSubscriptionClient struct {
        txClient base.TransactionNotificationsClient

        confirmed   chan *lnwallet.TransactionDetail
        unconfirmed chan *lnwallet.TransactionDetail

        w *base.Wallet

        wg   sync.WaitGroup
        quit chan struct{}
}

// ConfirmedTransactions returns a channel which will be sent on as new
// relevant transactions are confirmed.
//
// This is part of the TransactionSubscription interface.
func (t *txSubscriptionClient) ConfirmedTransactions() chan *lnwallet.TransactionDetail {
        return t.confirmed
}

// UnconfirmedTransactions returns a channel which will be sent on as
// new relevant transactions are seen within the network.
//
// This is part of the TransactionSubscription interface.
func (t *txSubscriptionClient) UnconfirmedTransactions() chan *lnwallet.TransactionDetail {
        return t.unconfirmed
}

// Cancel finalizes the subscription, cleaning up any resources allocated.
//
// This is part of the TransactionSubscription interface.
func (t *txSubscriptionClient) Cancel() {
        close(t.quit)
        t.wg.Wait()

        t.txClient.Done()
}

// notificationProxier proxies the notifications received by the underlying
// wallet's notification client to a higher-level TransactionSubscription
// client.
func (t *txSubscriptionClient) notificationProxier() {
        defer t.wg.Done()

out:
        for {
                select {
                case txNtfn := <-t.txClient.C:
                        // TODO(roasbeef): handle detached blocks
                        currentHeight := t.w.Manager.SyncedTo().Height

                        // Launch a goroutine to re-package and send
                        // notifications for any newly confirmed transactions.
                        //nolint:ll
                        go func(txNtfn *base.TransactionNotifications) {
                                for _, block := range txNtfn.AttachedBlocks {
                                        details, err := minedTransactionsToDetails(
                                                currentHeight, block,
                                                t.w.ChainParams(),
                                        )
                                        if err != nil {
                                                continue
                                        }

                                        for _, d := range details {
                                                select {
                                                case t.confirmed <- d:
                                                case <-t.quit:
                                                        return
                                                }
                                        }
                                }
                        }(txNtfn)

                        // Launch a goroutine to re-package and send
                        // notifications for any newly unconfirmed transactions.
                        go func(txNtfn *base.TransactionNotifications) {
                                for _, tx := range txNtfn.UnminedTransactions {
                                        detail, err := unminedTransactionsToDetail(
                                                tx, t.w.ChainParams(),
                                        )
                                        if err != nil {
                                                continue
                                        }

                                        select {
                                        case t.unconfirmed <- detail:
                                        case <-t.quit:
                                                return
                                        }
                                }
                        }(txNtfn)
                case <-t.quit:
                        break out
                }
        }
}

// SubscribeTransactions returns a TransactionSubscription client which
// is capable of receiving async notifications as new transactions
// related to the wallet are seen within the network, or found in
// blocks.
//
// This is a part of the WalletController interface.
func (b *BtcWallet) SubscribeTransactions() (lnwallet.TransactionSubscription, error) {
        walletClient := b.wallet.NtfnServer.TransactionNotifications()

        txClient := &txSubscriptionClient{
                txClient:    walletClient,
                confirmed:   make(chan *lnwallet.TransactionDetail),
                unconfirmed: make(chan *lnwallet.TransactionDetail),
                w:           b.wallet,
                quit:        make(chan struct{}),
        }
        txClient.wg.Add(1)
        go txClient.notificationProxier()

        return txClient, nil
}

// IsSynced returns a boolean indicating if from the PoV of the wallet, it has
// fully synced to the current best block in the main chain.
//
// This is a part of the WalletController interface.
func (b *BtcWallet) IsSynced() (bool, int64, error) {
        // Grab the best chain state the wallet is currently aware of.
        syncState := b.wallet.Manager.SyncedTo()

        // We'll also extract the current best wallet timestamp so the caller
        // can get an idea of where we are in the sync timeline.
        bestTimestamp := syncState.Timestamp.Unix()

        // Next, query the chain backend to grab the info about the tip of the
        // main chain.
        bestHash, bestHeight, err := b.cfg.ChainSource.GetBestBlock()
        if err != nil {
                return false, 0, err
        }

        // Make sure the backing chain has been considered synced first.
        if !b.wallet.ChainSynced() {
                bestHeader, err := b.cfg.ChainSource.GetBlockHeader(bestHash)
                if err != nil {
                        return false, 0, err
                }
                bestTimestamp = bestHeader.Timestamp.Unix()
                return false, bestTimestamp, nil
        }

        // If the wallet hasn't yet fully synced to the node's best chain tip,
        // then we're not yet fully synced.
        if syncState.Height < bestHeight {
                return false, bestTimestamp, nil
        }

        // If the wallet is on par with the current best chain tip, then we
        // still may not yet be synced as the chain backend may still be
        // catching up to the main chain. So we'll grab the block header in
        // order to make a guess based on the current time stamp.
        blockHeader, err := b.cfg.ChainSource.GetBlockHeader(bestHash)
        if err != nil {
                return false, 0, err
        }

        // If the timestamp on the best header is more than 2 hours in the
        // past, then we're not yet synced.
        minus24Hours := time.Now().Add(-2 * time.Hour)
        if blockHeader.Timestamp.Before(minus24Hours) {
                return false, bestTimestamp, nil
        }

        return true, bestTimestamp, nil
}

// GetRecoveryInfo returns a boolean indicating whether the wallet is started
// in recovery mode. It also returns a float64, ranging from 0 to 1,
// representing the recovery progress made so far.
//
// This is a part of the WalletController interface.
func (b *BtcWallet) GetRecoveryInfo() (bool, float64, error) {
        isRecoveryMode := true
        progress := float64(0)

        // A zero value in RecoveryWindow indicates there is no trigger of
        // recovery mode.
        if b.cfg.RecoveryWindow == 0 {
                isRecoveryMode = false
                return isRecoveryMode, progress, nil
        }

        // Query the wallet's birthday block from db.
        birthdayBlock, err := b.wallet.BirthdayBlock()
        if err != nil {
                // The wallet won't start until the backend is synced, thus the birthday
                // block won't be set and this particular error will be returned. We'll
                // catch this error and return a progress of 0 instead.
                if waddrmgr.IsError(err, waddrmgr.ErrBirthdayBlockNotSet) {
                        return isRecoveryMode, progress, nil
                }

                return isRecoveryMode, progress, err
        }

        // Grab the best chain state the wallet is currently aware of.
        syncState := b.wallet.Manager.SyncedTo()

        // Next, query the chain backend to grab the info about the tip of the
        // main chain.
        //
        // NOTE: The actual recovery process is handled by the btcsuite/btcwallet.
        // The process purposefully doesn't update the best height. It might create
        // a small difference between the height queried here and the height used
        // in the recovery process, ie, the bestHeight used here might be greater,
        // showing the recovery being unfinished while it's actually done. However,
        // during a wallet rescan after the recovery, the wallet's synced height
        // will catch up and this won't be an issue.
        _, bestHeight, err := b.cfg.ChainSource.GetBestBlock()
        if err != nil {
                return isRecoveryMode, progress, err
        }

        // The birthday block height might be greater than the current synced height
        // in a newly restored wallet, and might be greater than the chain tip if a
        // rollback happens. In that case, we will return zero progress here.
        if syncState.Height < birthdayBlock.Height ||
                bestHeight < birthdayBlock.Height {

                return isRecoveryMode, progress, nil
        }

        // progress is the ratio of the [number of blocks processed] over the [total
        // number of blocks] needed in a recovery mode, ranging from 0 to 1, in
        // which,
        // - total number of blocks is the current chain's best height minus the
        //   wallet's birthday height plus 1.
        // - number of blocks processed is the wallet's synced height minus its
        //   birthday height plus 1.
        // - If the wallet is born very recently, the bestHeight can be equal to
        //   the birthdayBlock.Height, and it will recovery instantly.
        progress = float64(syncState.Height-birthdayBlock.Height+1) /
                float64(bestHeight-birthdayBlock.Height+1)

        return isRecoveryMode, progress, nil
}

// FetchTx attempts to fetch a transaction in the wallet's database identified
// by the passed transaction hash. If the transaction can't be found, then a
// nil pointer is returned.
func (b *BtcWallet) FetchTx(txHash chainhash.Hash) (*wire.MsgTx, error) {
        tx, err := b.wallet.GetTransaction(txHash)
        if err != nil {
                return nil, err
        }

        return tx.Summary.Tx, nil
}

// RemoveDescendants attempts to remove any transaction from the wallet's tx
// store (that may be unconfirmed) that spends outputs created by the passed
// transaction. This remove propagates recursively down the chain of descendent
// transactions.
func (b *BtcWallet) RemoveDescendants(tx *wire.MsgTx) error {
        return b.wallet.RemoveDescendants(tx)
}

// CheckMempoolAcceptance is a wrapper around `TestMempoolAccept` which checks
// the mempool acceptance of a transaction.
func (b *BtcWallet) CheckMempoolAcceptance(tx *wire.MsgTx) error {
        // Use a max feerate of 0 means the default value will be used when
        // testing mempool acceptance. The default max feerate is 0.10 BTC/kvb,
        // or 10,000 sat/vb.
        results, err := b.chain.TestMempoolAccept([]*wire.MsgTx{tx}, 0)
        if err != nil {
                return err
        }

        // Sanity check that the expected single result is returned.
        if len(results) != 1 {
                return fmt.Errorf("expected 1 result from TestMempoolAccept, "+
                        "instead got %v", len(results))
        }

        result := results[0]
        log.Debugf("TestMempoolAccept result: %s", spew.Sdump(result))

        // Mempool check failed, we now map the reject reason to a proper RPC
        // error and return it.
        if !result.Allowed {
                err := b.chain.MapRPCErr(errors.New(result.RejectReason))

                return fmt.Errorf("mempool rejection: %w", err)
        }

        return nil
}

lightningnetwork / lnd / 14000719599

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