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105 lines
3.0 KiB
Go
105 lines
3.0 KiB
Go
package liquidity
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import (
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"github.com/btcsuite/btcutil"
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"github.com/lightninglabs/loop"
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"github.com/lightningnetwork/lnd/lnwallet/chainfee"
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"github.com/lightningnetwork/lnd/lnwire"
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"github.com/lightningnetwork/lnd/routing/route"
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)
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// FeeLimit is an interface implemented by different strategies for limiting
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// the fees we pay for autoloops.
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type FeeLimit interface {
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// String returns the string representation of fee limits.
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String() string
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// validate returns an error if the values provided are invalid.
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validate() error
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// mayLoopOut checks whether we may dispatch a loop out swap based on
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// the current fee conditions.
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mayLoopOut(estimate chainfee.SatPerKWeight) error
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// loopOutLimits checks whether the quote provided is within our fee
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// limits for the swap amount.
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loopOutLimits(amount btcutil.Amount, quote *loop.LoopOutQuote) error
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// loopOutFees return the maximum prepay and invoice routing fees for
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// a swap amount and quote.
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loopOutFees(amount btcutil.Amount, quote *loop.LoopOutQuote) (
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btcutil.Amount, btcutil.Amount, btcutil.Amount)
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}
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// swapSuggestion is an interface implemented by suggested swaps for our
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// different swap types. This interface is used to allow us to handle different
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// swap types with the same autoloop logic.
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type swapSuggestion interface {
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// fees returns the highest possible fee amount we could pay for a swap
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// in satoshis.
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fees() btcutil.Amount
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// amount returns the swap amount in satoshis.
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amount() btcutil.Amount
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// channels returns the set of channels involved in the swap.
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channels() []lnwire.ShortChannelID
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// peers returns the set of peers involved in the swap, taking a map
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// of known channel IDs to peers as an argument so that channel peers
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// can be looked up.
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peers(knownChans map[uint64]route.Vertex) []route.Vertex
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}
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// Compile-time assertion that loopOutSwapSuggestion satisfies the
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// swapSuggestion interface.
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var _ swapSuggestion = (*loopOutSwapSuggestion)(nil)
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type loopOutSwapSuggestion struct {
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loop.OutRequest
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}
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func (l *loopOutSwapSuggestion) amount() btcutil.Amount {
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return l.Amount
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}
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func (l *loopOutSwapSuggestion) fees() btcutil.Amount {
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return worstCaseOutFees(
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l.MaxPrepayRoutingFee, l.MaxSwapRoutingFee, l.MaxSwapFee,
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l.MaxMinerFee, l.MaxPrepayAmount,
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)
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}
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func (l *loopOutSwapSuggestion) channels() []lnwire.ShortChannelID {
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channels := make([]lnwire.ShortChannelID, len(l.OutgoingChanSet))
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for i, id := range l.OutgoingChanSet {
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channels[i] = lnwire.NewShortChanIDFromInt(id)
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}
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return channels
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}
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// peers returns the set of peers that the loop out swap is restricted to.
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func (l *loopOutSwapSuggestion) peers(
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knownChans map[uint64]route.Vertex) []route.Vertex {
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peers := make(map[route.Vertex]struct{}, len(knownChans))
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for _, channel := range l.OutgoingChanSet {
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peer, ok := knownChans[channel]
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if !ok {
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log.Warnf("peer for channel: %v unknown", channel)
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}
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peers[peer] = struct{}{}
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}
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peerList := make([]route.Vertex, 0, len(peers))
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for peer := range peers {
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peerList = append(peerList, peer)
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}
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return peerList
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}
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