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https://github.com/lightninglabs/loop.git
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0ee07198f6
Include https://github.com/lightninglabs/lndclient/pull/280 multi: migrate to btcd v2 modules + add WalletKit.SubmitPackage Migrate Loop imports and update Aperture and Taproot Assets to compatible revisions so this commit remains green on its own.
101 lines
3.1 KiB
Go
101 lines
3.1 KiB
Go
package loopin
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import (
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"context"
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"errors"
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"github.com/btcsuite/btcd/btcutil/v2"
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"github.com/lightninglabs/loop"
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"github.com/lightninglabs/loop/staticaddr/deposit"
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"github.com/lightningnetwork/lnd/routing/route"
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)
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var (
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// ErrNoAutoloopCandidate is returned when the static-address side
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// cannot build a full-deposit, no-change loop-in candidate that fits
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// the planner's requested amount bounds.
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ErrNoAutoloopCandidate = errors.New("no autoloop candidate")
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)
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// PrepareAutoloopLoopIn builds a static-address loop-in request for autoloop
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// without dispatching it. The returned request always uses full deposits,
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// explicit outpoints, and an explicit selected amount, so the caller can
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// account for the suggestion without depending on static-address internals.
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func (m *Manager) PrepareAutoloopLoopIn(ctx context.Context,
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lastHop route.Vertex, minAmount, maxAmount btcutil.Amount, label,
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initiator string, excludedOutpoints []string) (
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*loop.StaticAddressLoopInRequest, int, bool, error) {
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if minAmount <= 0 || maxAmount < minAmount {
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return nil, 0, false, ErrNoAutoloopCandidate
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}
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err := m.cfg.DepositManager.EnsureDepositsFresh(ctx)
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if err != nil {
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return nil, 0, false, err
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}
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allDeposits, 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 nil, 0, false, err
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}
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params, err := m.cfg.AddressManager.GetStaticAddressParameters(ctx)
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if err != nil {
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return nil, 0, false, err
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}
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excluded := make(map[string]struct{}, len(excludedOutpoints))
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for _, outpoint := range excludedOutpoints {
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excluded[outpoint] = struct{}{}
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}
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selectedDeposits, err := selectNoChangeDeposits(
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maxAmount, minAmount, allDeposits, params.Expiry,
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m.currentHeight.Load(), excluded,
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)
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if err != nil {
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return nil, 0, false, err
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}
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selectedAmount := sumOfDeposits(selectedDeposits)
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quote, err := m.cfg.QuoteGetter.GetLoopInQuote(
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ctx, selectedAmount, m.cfg.NodePubkey, &lastHop, nil,
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initiator, uint32(len(selectedDeposits)), false,
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)
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if err != nil {
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return nil, 0, false, err
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}
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outpoints := make([]string, 0, len(selectedDeposits))
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for _, selectedDeposit := range selectedDeposits {
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outpoints = append(outpoints, selectedDeposit.OutPoint.String())
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}
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request := &loop.StaticAddressLoopInRequest{
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DepositOutpoints: outpoints,
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SelectedAmount: selectedAmount,
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MaxSwapFee: quote.SwapFee,
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LastHop: &lastHop,
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Label: label,
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Initiator: initiator,
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Fast: false,
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}
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return request, len(selectedDeposits), false, nil
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}
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// selectNoChangeDeposits chooses the highest-value swappable deposit set whose
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// full value stays within the requested range. The selector never creates
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// change, so the returned set's total is the actual swap amount.
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func selectNoChangeDeposits(maxAmount, minAmount btcutil.Amount,
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unfilteredDeposits []*deposit.Deposit, csvExpiry, blockHeight uint32,
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excludedOutpoints map[string]struct{}) ([]*deposit.Deposit, error) {
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return selectNoChangeDepositsWithMemoryBudget(
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maxAmount, minAmount, unfilteredDeposits, csvExpiry,
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blockHeight, excludedOutpoints, autoloopDPMaxMemoryBytes,
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)
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}
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