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728 lines
18 KiB
Go
728 lines
18 KiB
Go
package withdraw
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import (
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"context"
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"errors"
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"fmt"
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"reflect"
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"strings"
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"sync"
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"github.com/btcsuite/btcd/btcec/v2/schnorr/musig2"
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"github.com/btcsuite/btcd/btcutil"
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"github.com/btcsuite/btcd/chaincfg"
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"github.com/btcsuite/btcd/txscript"
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"github.com/btcsuite/btcd/wire"
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"github.com/btcsuite/btclog"
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"github.com/lightninglabs/lndclient"
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"github.com/lightninglabs/loop/staticaddr"
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"github.com/lightninglabs/loop/staticaddr/deposit"
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staticaddressrpc "github.com/lightninglabs/loop/swapserverrpc"
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"github.com/lightningnetwork/lnd/input"
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"github.com/lightningnetwork/lnd/lnrpc/walletrpc"
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"github.com/lightningnetwork/lnd/lnwallet"
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"github.com/lightningnetwork/lnd/lnwallet/chainfee"
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)
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var (
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// ErrWithdrawingInactiveDeposits is returned when the user tries to
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// withdraw inactive deposits.
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ErrWithdrawingInactiveDeposits = errors.New("deposits to be " +
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"withdrawn are unknown or inactive")
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// MinConfs is the minimum number of confirmations we require for a
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// deposit to be considered withdrawn.
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MinConfs int32 = 3
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// Is the default confirmation target for the fee estimation of the
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// withdrawal transaction.
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defaultConfTarget int32 = 3
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log btclog.Logger
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)
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// ManagerConfig holds the configuration for the address manager.
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type ManagerConfig struct {
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WithdrawalServerClient staticaddressrpc.WithdrawalServerClient
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AddressManager AddressManager
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DepositManager DepositManager
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// WalletKit is the wallet client that is used to derive new keys from
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// lnd's wallet.
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WalletKit lndclient.WalletKitClient
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// ChainParams is the chain configuration(mainnet, testnet...) this
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// manager uses.
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ChainParams *chaincfg.Params
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// ChainNotifier is the chain notifier that is used to listen for new
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// blocks.
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ChainNotifier lndclient.ChainNotifierClient
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// Signer is the signer client that is used to sign transactions.
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Signer lndclient.SignerClient
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}
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// Manager manages the address state machines.
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type Manager struct {
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cfg *ManagerConfig
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runCtx context.Context
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sync.Mutex
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// initChan signals the daemon that the address manager has completed
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// its initialization.
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initChan chan struct{}
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// initiationHeight stores the currently best known block height.
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initiationHeight uint32
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// currentHeight stores the currently best known block height.
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currentHeight uint32
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activeWithdrawals map[string][]*deposit.Deposit
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}
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// NewManager creates a new deposit withdrawal manager.
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func NewManager(cfg *ManagerConfig) *Manager {
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log = staticaddr.GetLogger()
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return &Manager{
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cfg: cfg,
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initChan: make(chan struct{}),
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activeWithdrawals: make(map[string][]*deposit.Deposit),
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}
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}
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// Run runs the deposit withdrawal manager.
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func (m *Manager) Run(ctx context.Context, currentHeight uint32) error {
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m.runCtx = ctx
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m.Lock()
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m.currentHeight, m.initiationHeight = currentHeight, currentHeight
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m.Unlock()
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newBlockChan, newBlockErrChan, err := m.cfg.ChainNotifier.RegisterBlockEpochNtfn(m.runCtx) //nolint:lll
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if err != nil {
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return err
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}
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err = m.recover()
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if err != nil {
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return err
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}
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// Communicate to the caller that the address manager has completed its
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// initialization.
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close(m.initChan)
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for {
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select {
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case height := <-newBlockChan:
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m.Lock()
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m.currentHeight = uint32(height)
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m.Unlock()
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err = m.republishWithdrawals()
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if err != nil {
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log.Errorf("Error republishing withdrawals: %v",
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err)
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}
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case err = <-newBlockErrChan:
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return err
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case <-m.runCtx.Done():
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return m.runCtx.Err()
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}
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}
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}
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func (m *Manager) recover() error {
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// To recover withdrawals we skim through all active deposits and check
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// if they have a withdrawal address set. For the ones that do we
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// cluster those with equal withdrawal addresses and kick-off
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// their withdrawal. Each cluster represents a separate withdrawal
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// intend by the user.
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activeDeposits, err := m.cfg.DepositManager.GetActiveDepositsInState(
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deposit.Deposited,
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)
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if err != nil {
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return err
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}
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// Group the deposits by their withdrawal address.
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depositsByWithdrawalAddress := make(map[string][]*deposit.Deposit)
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for _, d := range activeDeposits {
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sweepAddress := d.WithdrawalSweepAddress
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if sweepAddress == "" {
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continue
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}
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depositsByWithdrawalAddress[sweepAddress] = append(
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depositsByWithdrawalAddress[sweepAddress], d,
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)
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}
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// We can now reinstate each cluster of deposits for a withdrawal.
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for address, deposits := range depositsByWithdrawalAddress {
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withdrawalAddress, err := btcutil.DecodeAddress(
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address, m.cfg.ChainParams,
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)
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if err != nil {
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return err
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}
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err = m.cfg.DepositManager.TransitionDeposits(
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deposits, deposit.OnWithdraw, deposit.Withdrawing,
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)
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if err != nil {
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return err
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}
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err = m.publishWithdrawal(m.runCtx, deposits, withdrawalAddress)
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if err != nil {
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return err
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}
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err = m.handleWithdrawal(deposits, withdrawalAddress)
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if err != nil {
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return err
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}
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m.Lock()
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m.activeWithdrawals[address] = deposits
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m.Unlock()
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}
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return nil
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}
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// WaitInitComplete waits until the address manager has completed its setup.
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func (m *Manager) WaitInitComplete() {
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defer log.Debugf("Static address withdrawal manager initiation " +
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"complete.")
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<-m.initChan
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}
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// WithdrawDeposits starts a deposits withdrawal flow.
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func (m *Manager) WithdrawDeposits(ctx context.Context,
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outpoints []wire.OutPoint) error {
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if len(outpoints) == 0 {
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return fmt.Errorf("no outpoints selected to withdraw")
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}
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// Ensure that the deposits are in a state in which they can be
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// withdrawn.
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deposits, allActive := m.cfg.DepositManager.AllOutpointsActiveDeposits(
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outpoints, deposit.Deposited)
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if !allActive {
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return ErrWithdrawingInactiveDeposits
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}
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// Generate the withdrawal address from our local lnd wallet.
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withdrawalAddress, err := m.cfg.WalletKit.NextAddr(
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ctx, lnwallet.DefaultAccountName,
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walletrpc.AddressType_TAPROOT_PUBKEY, false,
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)
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if err != nil {
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return err
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}
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// Attach the withdrawal address to the deposits. After a client restart
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// we can use this address as an indicator to continue the withdrawal.
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// If there are multiple deposits with the same withdrawal address, we
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// bundle them together in the same withdrawal transaction.
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for _, d := range deposits {
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d.Lock()
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d.WithdrawalSweepAddress = withdrawalAddress.String()
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d.Unlock()
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}
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// Transition the deposits to the withdrawing state. This updates each
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// deposits withdrawal address. If a transition fails, we'll return an
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// error and abort the withdrawal. An error in transition is likely due
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// to an error in the state machine. The already transitioned deposits
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// should be reset to the Deposit state after a restart.
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err = m.cfg.DepositManager.TransitionDeposits(
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deposits, deposit.OnWithdraw, deposit.Withdrawing,
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)
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if err != nil {
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return err
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}
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err = m.publishWithdrawal(ctx, deposits, withdrawalAddress)
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if err != nil {
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return err
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}
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err = m.handleWithdrawal(deposits, withdrawalAddress)
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if err != nil {
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return err
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}
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m.Lock()
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m.activeWithdrawals[withdrawalAddress.String()] = deposits
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m.Unlock()
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return nil
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}
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func (m *Manager) publishWithdrawal(ctx context.Context,
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deposits []*deposit.Deposit, withdrawalAddress btcutil.Address) error {
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// Create a musig2 session for each deposit.
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withdrawalSessions, clientNonces, err := m.createMusig2Sessions(
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ctx, deposits,
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)
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if err != nil {
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return err
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}
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// Get the fee rate for the withdrawal sweep.
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withdrawalSweepFeeRate, err := m.cfg.WalletKit.EstimateFeeRate(
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m.runCtx, defaultConfTarget,
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)
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if err != nil {
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return err
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}
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outpoints := toOutpoints(deposits)
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resp, err := m.cfg.WithdrawalServerClient.WithdrawDeposits(
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m.runCtx,
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&staticaddressrpc.ServerWithdrawRequest{
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Outpoints: toServerOutpoints(outpoints),
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ClientNonces: clientNonces,
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ClientSweepAddr: withdrawalAddress.String(),
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MusigTxFeeRate: uint64(withdrawalSweepFeeRate),
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},
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)
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if err != nil {
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return err
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}
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addressParams, err := m.cfg.AddressManager.GetStaticAddressParameters(
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ctx,
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)
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if err != nil {
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return fmt.Errorf("couldn't get confirmation height for "+
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"deposit, %v", err)
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}
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prevOuts := m.toPrevOuts(deposits, addressParams.PkScript)
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totalValue := withdrawalValue(prevOuts)
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withdrawalTx, err := m.createWithdrawalTx(
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outpoints, totalValue, withdrawalAddress,
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withdrawalSweepFeeRate,
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)
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if err != nil {
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return err
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}
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coopServerNonces, err := toNonces(resp.ServerNonces)
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if err != nil {
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return err
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}
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// Next we'll get our sweep tx signatures.
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prevOutFetcher := txscript.NewMultiPrevOutFetcher(prevOuts)
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_, err = m.signMusig2Tx(
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m.runCtx, prevOutFetcher, outpoints, m.cfg.Signer, withdrawalTx,
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withdrawalSessions, coopServerNonces,
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)
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if err != nil {
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return err
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}
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// Now we'll finalize the sweepless sweep transaction.
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finalizedWithdrawalTx, err := m.finalizeMusig2Transaction(
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m.runCtx, outpoints, m.cfg.Signer, withdrawalSessions,
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withdrawalTx, resp.Musig2SweepSigs,
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)
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if err != nil {
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return err
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}
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txLabel := fmt.Sprintf("deposit-withdrawal-%v",
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finalizedWithdrawalTx.TxHash())
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// Publish the withdrawal sweep transaction.
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err = m.cfg.WalletKit.PublishTransaction(
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m.runCtx, finalizedWithdrawalTx, txLabel,
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)
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if err != nil {
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if !strings.Contains(err.Error(), "output already spent") {
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log.Errorf("%v: %v", txLabel, err)
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return err
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}
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} else {
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log.Debugf("published deposit withdrawal with txid: %v",
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finalizedWithdrawalTx.TxHash())
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}
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return err
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}
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func (m *Manager) handleWithdrawal(deposits []*deposit.Deposit,
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withdrawalAddress btcutil.Address) error {
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withdrawalPkScript, err := txscript.PayToAddrScript(withdrawalAddress)
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if err != nil {
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return err
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}
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confChan, errChan, err := m.cfg.ChainNotifier.RegisterConfirmationsNtfn(
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m.runCtx, nil, withdrawalPkScript, MinConfs,
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int32(m.initiationHeight),
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)
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if err != nil {
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return err
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}
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go func() {
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select {
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case <-confChan:
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err = m.cfg.DepositManager.TransitionDeposits(
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deposits, deposit.OnWithdrawn,
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deposit.Withdrawn,
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)
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if err != nil {
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log.Errorf("Error transitioning deposits: %v",
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err)
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}
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// Remove the withdrawal from the active withdrawals.
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m.Lock()
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delete(m.activeWithdrawals, withdrawalAddress.String())
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m.Unlock()
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case err := <-errChan:
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log.Errorf("Error waiting for confirmation: %v", err)
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case <-m.runCtx.Done():
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log.Errorf("Withdrawal tx confirmation wait canceled")
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}
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}()
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return nil
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}
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func toOutpoints(deposits []*deposit.Deposit) []wire.OutPoint {
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outpoints := make([]wire.OutPoint, len(deposits))
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for i, d := range deposits {
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outpoints[i] = wire.OutPoint{
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Hash: d.Hash,
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Index: d.Index,
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}
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}
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return outpoints
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}
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// signMusig2Tx adds the server nonces to the musig2 sessions and signs the
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// transaction.
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func (m *Manager) signMusig2Tx(ctx context.Context,
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prevOutFetcher *txscript.MultiPrevOutFetcher, outpoints []wire.OutPoint,
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signer lndclient.SignerClient, tx *wire.MsgTx,
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musig2sessions []*input.MuSig2SessionInfo,
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counterPartyNonces [][musig2.PubNonceSize]byte) ([][]byte, error) {
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sigHashes := txscript.NewTxSigHashes(tx, prevOutFetcher)
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sigs := make([][]byte, len(outpoints))
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for idx, outpoint := range outpoints {
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if !reflect.DeepEqual(tx.TxIn[idx].PreviousOutPoint,
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outpoint) {
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return nil, fmt.Errorf("tx input does not match " +
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"deposits")
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}
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taprootSigHash, err := txscript.CalcTaprootSignatureHash(
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sigHashes, txscript.SigHashDefault, tx, idx,
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prevOutFetcher,
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)
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if err != nil {
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return nil, err
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}
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var digest [32]byte
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copy(digest[:], taprootSigHash)
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// Register the server's nonce before attempting to create our
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// partial signature.
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haveAllNonces, err := signer.MuSig2RegisterNonces(
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ctx, musig2sessions[idx].SessionID,
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[][musig2.PubNonceSize]byte{counterPartyNonces[idx]},
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)
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if err != nil {
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return nil, err
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}
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// Sanity check that we have all the nonces.
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if !haveAllNonces {
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return nil, fmt.Errorf("invalid MuSig2 session: " +
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"nonces missing")
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}
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// Since our MuSig2 session has all nonces, we can now create
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// the local partial signature by signing the sig hash.
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sig, err := signer.MuSig2Sign(
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ctx, musig2sessions[idx].SessionID, digest, false,
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)
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if err != nil {
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return nil, err
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}
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sigs[idx] = sig
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}
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return sigs, nil
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}
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func withdrawalValue(prevOuts map[wire.OutPoint]*wire.TxOut) btcutil.Amount {
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var totalValue btcutil.Amount
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for _, prevOut := range prevOuts {
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totalValue += btcutil.Amount(prevOut.Value)
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}
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return totalValue
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}
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// toNonces converts a byte slice to a 66 byte slice.
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func toNonces(nonces [][]byte) ([][66]byte, error) {
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res := make([][66]byte, 0, len(nonces))
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for _, n := range nonces {
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n := n
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nonce, err := byteSliceTo66ByteSlice(n)
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if err != nil {
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return nil, err
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}
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res = append(res, nonce)
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}
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return res, nil
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}
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// byteSliceTo66ByteSlice converts a byte slice to a 66 byte slice.
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func byteSliceTo66ByteSlice(b []byte) ([66]byte, error) {
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if len(b) != 66 {
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return [66]byte{}, fmt.Errorf("invalid byte slice length")
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}
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var res [66]byte
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copy(res[:], b)
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return res, nil
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}
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func (m *Manager) createWithdrawalTx(outpoints []wire.OutPoint,
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withdrawlAmount btcutil.Amount, clientSweepAddress btcutil.Address,
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feeRate chainfee.SatPerKWeight) (*wire.MsgTx,
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error) {
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// First Create the tx.
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msgTx := wire.NewMsgTx(2)
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// Add the deposit inputs to the transaction in the order the server
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// signed them.
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for _, outpoint := range outpoints {
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msgTx.AddTxIn(&wire.TxIn{
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PreviousOutPoint: outpoint,
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})
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}
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// Estimate the fee
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weight, err := withdrawalFee(len(outpoints), clientSweepAddress)
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if err != nil {
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return nil, err
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}
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pkscript, err := txscript.PayToAddrScript(clientSweepAddress)
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if err != nil {
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return nil, err
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}
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fee := feeRate.FeeForWeight(weight)
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// Create the sweep output
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sweepOutput := &wire.TxOut{
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Value: int64(withdrawlAmount) - int64(fee),
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PkScript: pkscript,
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}
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msgTx.AddTxOut(sweepOutput)
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return msgTx, nil
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}
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|
|
// withdrawalFee returns the weight for the withdrawal transaction.
|
|
func withdrawalFee(numInputs int, sweepAddress btcutil.Address) (int64,
|
|
error) {
|
|
|
|
var weightEstimator input.TxWeightEstimator
|
|
for i := 0; i < numInputs; i++ {
|
|
weightEstimator.AddTaprootKeySpendInput(
|
|
txscript.SigHashDefault,
|
|
)
|
|
}
|
|
|
|
// Get the weight of the sweep output.
|
|
switch sweepAddress.(type) {
|
|
case *btcutil.AddressWitnessPubKeyHash:
|
|
weightEstimator.AddP2WKHOutput()
|
|
|
|
case *btcutil.AddressTaproot:
|
|
weightEstimator.AddP2TROutput()
|
|
|
|
default:
|
|
return 0, fmt.Errorf("invalid sweep address type %T",
|
|
sweepAddress)
|
|
}
|
|
|
|
return int64(weightEstimator.Weight()), nil
|
|
}
|
|
|
|
// finalizeMusig2Transaction creates the finalized transactions for either
|
|
// the htlc or the cooperative close.
|
|
func (m *Manager) finalizeMusig2Transaction(ctx context.Context,
|
|
outpoints []wire.OutPoint, signer lndclient.SignerClient,
|
|
musig2Sessions []*input.MuSig2SessionInfo,
|
|
tx *wire.MsgTx, serverSigs [][]byte) (*wire.MsgTx, error) {
|
|
|
|
for idx := range outpoints {
|
|
haveAllSigs, finalSig, err := signer.MuSig2CombineSig(
|
|
ctx, musig2Sessions[idx].SessionID,
|
|
[][]byte{serverSigs[idx]},
|
|
)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if !haveAllSigs {
|
|
return nil, fmt.Errorf("missing sigs")
|
|
}
|
|
|
|
tx.TxIn[idx].Witness = wire.TxWitness{finalSig}
|
|
}
|
|
|
|
return tx, nil
|
|
}
|
|
|
|
func toServerOutpoints(outpoints []wire.OutPoint) []*staticaddressrpc.ServerOutPoint { //nolint:lll
|
|
var result []*staticaddressrpc.ServerOutPoint
|
|
for _, o := range outpoints {
|
|
outP := o
|
|
outpoint := &staticaddressrpc.ServerOutPoint{
|
|
TxidBytes: outP.Hash[:],
|
|
OutputIndex: outP.Index,
|
|
}
|
|
result = append(result, outpoint)
|
|
}
|
|
|
|
return result
|
|
}
|
|
|
|
// createMusig2Sessions creates a musig2 session for a number of deposits.
|
|
func (m *Manager) createMusig2Sessions(ctx context.Context,
|
|
deposits []*deposit.Deposit) ([]*input.MuSig2SessionInfo, [][]byte,
|
|
error) {
|
|
|
|
musig2Sessions := make([]*input.MuSig2SessionInfo, len(deposits))
|
|
clientNonces := make([][]byte, len(deposits))
|
|
|
|
// Create the sessions and nonces from the deposits.
|
|
for i := 0; i < len(deposits); i++ {
|
|
session, err := m.createMusig2Session(ctx)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
musig2Sessions[i] = session
|
|
clientNonces[i] = session.PublicNonce[:]
|
|
}
|
|
|
|
return musig2Sessions, clientNonces, nil
|
|
}
|
|
|
|
// Musig2CreateSession creates a musig2 session for the deposit.
|
|
func (m *Manager) createMusig2Session(ctx context.Context) (
|
|
*input.MuSig2SessionInfo, error) {
|
|
|
|
addressParams, err := m.cfg.AddressManager.GetStaticAddressParameters(
|
|
ctx,
|
|
)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("couldn't get confirmation height for "+
|
|
"deposit, %v", err)
|
|
}
|
|
|
|
signers := [][]byte{
|
|
addressParams.ClientPubkey.SerializeCompressed(),
|
|
addressParams.ServerPubkey.SerializeCompressed(),
|
|
}
|
|
|
|
address, err := m.cfg.AddressManager.GetStaticAddress(ctx)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("couldn't get confirmation height for "+
|
|
"deposit, %v", err)
|
|
}
|
|
|
|
expiryLeaf := address.TimeoutLeaf
|
|
|
|
rootHash := expiryLeaf.TapHash()
|
|
|
|
return m.cfg.Signer.MuSig2CreateSession(
|
|
ctx, input.MuSig2Version100RC2, &addressParams.KeyLocator,
|
|
signers, lndclient.MuSig2TaprootTweakOpt(rootHash[:], false),
|
|
)
|
|
}
|
|
|
|
func (m *Manager) toPrevOuts(deposits []*deposit.Deposit,
|
|
pkScript []byte) map[wire.OutPoint]*wire.TxOut {
|
|
|
|
prevOuts := make(map[wire.OutPoint]*wire.TxOut, len(deposits))
|
|
for _, d := range deposits {
|
|
outpoint := wire.OutPoint{
|
|
Hash: d.Hash,
|
|
Index: d.Index,
|
|
}
|
|
txOut := &wire.TxOut{
|
|
Value: int64(d.Value),
|
|
PkScript: pkScript,
|
|
}
|
|
prevOuts[outpoint] = txOut
|
|
}
|
|
|
|
return prevOuts
|
|
}
|
|
|
|
func (m *Manager) republishWithdrawals() error {
|
|
m.Lock()
|
|
defer m.Unlock()
|
|
|
|
for withdrawalAddress, deposits := range m.activeWithdrawals {
|
|
address, err := btcutil.DecodeAddress(
|
|
withdrawalAddress, m.cfg.ChainParams,
|
|
)
|
|
if err != nil {
|
|
log.Errorf("Error decoding withdrawal address: %v", err)
|
|
return err
|
|
}
|
|
|
|
err = m.publishWithdrawal(m.runCtx, deposits, address)
|
|
if err != nil {
|
|
log.Errorf("Error republishing withdrawal: %v", err)
|
|
return err
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|