liquidity: move loopout swap suggestion out of interface file

liquidity/interface.go

@@ -50,55 +50,3 @@ type swapSuggestion interface {
 	// can be looked up.
 	peers(knownChans map[uint64]route.Vertex) []route.Vertex
 }
-
-// Compile-time assertion that loopOutSwapSuggestion satisfies the
-// swapSuggestion interface.
-var _ swapSuggestion = (*loopOutSwapSuggestion)(nil)
-
-type loopOutSwapSuggestion struct {
-	loop.OutRequest
-}
-
-func (l *loopOutSwapSuggestion) amount() btcutil.Amount {
-	return l.Amount
-}
-
-func (l *loopOutSwapSuggestion) fees() btcutil.Amount {
-	return worstCaseOutFees(
-		l.MaxPrepayRoutingFee, l.MaxSwapRoutingFee, l.MaxSwapFee,
-		l.MaxMinerFee, l.MaxPrepayAmount,
-	)
-}
-
-func (l *loopOutSwapSuggestion) channels() []lnwire.ShortChannelID {
-	channels := make([]lnwire.ShortChannelID, len(l.OutgoingChanSet))
-
-	for i, id := range l.OutgoingChanSet {
-		channels[i] = lnwire.NewShortChanIDFromInt(id)
-	}
-
-	return channels
-}
-
-// peers returns the set of peers that the loop out swap is restricted to.
-func (l *loopOutSwapSuggestion) peers(
-	knownChans map[uint64]route.Vertex) []route.Vertex {
-
-	peers := make(map[route.Vertex]struct{}, len(knownChans))
-
-	for _, channel := range l.OutgoingChanSet {
-		peer, ok := knownChans[channel]
-		if !ok {
-			log.Warnf("peer for channel: %v unknown", channel)
-		}
-
-		peers[peer] = struct{}{}
-	}
-
-	peerList := make([]route.Vertex, 0, len(peers))
-	for peer := range peers {
-		peerList = append(peerList, peer)
-	}
-
-	return peerList
-}

liquidity/loopout.go

@@ -0,0 +1,66 @@
+package liquidity
+
+import (
+	"github.com/btcsuite/btcutil"
+	"github.com/lightninglabs/loop"
+	"github.com/lightningnetwork/lnd/lnwire"
+	"github.com/lightningnetwork/lnd/routing/route"
+)
+
+// Compile-time assertion that loopOutSwapSuggestion satisfies the
+// swapSuggestion interface.
+var _ swapSuggestion = (*loopOutSwapSuggestion)(nil)
+
+// loopOutSwapSuggestion is an implementation of the swapSuggestion interface
+// implemented to allow us to abstract away from the details of a specific
+// swap.
+type loopOutSwapSuggestion struct {
+	loop.OutRequest
+}
+
+// amount returns the amount being swapped.
+func (l *loopOutSwapSuggestion) amount() btcutil.Amount {
+	return l.Amount
+}
+
+// fees returns the maximum fees we could possibly pay for this swap.
+func (l *loopOutSwapSuggestion) fees() btcutil.Amount {
+	return worstCaseOutFees(
+		l.MaxPrepayRoutingFee, l.MaxSwapRoutingFee, l.MaxSwapFee,
+		l.MaxMinerFee, l.MaxPrepayAmount,
+	)
+}
+
+// channels returns the set of channels the loop out swap is restricted to.
+func (l *loopOutSwapSuggestion) channels() []lnwire.ShortChannelID {
+	channels := make([]lnwire.ShortChannelID, len(l.OutgoingChanSet))
+
+	for i, id := range l.OutgoingChanSet {
+		channels[i] = lnwire.NewShortChanIDFromInt(id)
+	}
+
+	return channels
+}
+
+// peers returns the set of peers that the loop out swap is restricted to.
+func (l *loopOutSwapSuggestion) peers(
+	knownChans map[uint64]route.Vertex) []route.Vertex {
+
+	peers := make(map[route.Vertex]struct{}, len(knownChans))
+
+	for _, channel := range l.OutgoingChanSet {
+		peer, ok := knownChans[channel]
+		if !ok {
+			log.Warnf("peer for channel: %v unknown", channel)
+		}
+
+		peers[peer] = struct{}{}
+	}
+
+	peerList := make([]route.Vertex, 0, len(peers))
+	for peer := range peers {
+		peerList = append(peerList, peer)
+	}
+
+	return peerList
+}