lnwallet: export HtlcWeight and CommitWeight publicly

lnwallet/channel.go

@@ -1972,7 +1972,7 @@ func (lc *LightningChannel) createCommitmentTx(c *commitment,
 	// on its total weight. Once we have the total weight, we'll multiply
 	// by the current fee-per-kw, then divide by 1000 to get the proper
 	// fee.
-	totalCommitWeight := commitWeight + (htlcWeight * numHTLCs)
+	totalCommitWeight := CommitWeight + (HtlcWeight * numHTLCs)
 
 	// With the weight known, we can now calculate the commitment fee,
 	// ensuring that we account for any dust outputs trimmed above.

lnwallet/reservation.go

@@ -144,7 +144,7 @@ func NewChannelReservation(capacity, fundingAmt, feePerKw btcutil.Amount,
 		initiator    bool
 	)
 
-	commitFee := btcutil.Amount((int64(feePerKw) * commitWeight) / 1000)
+	commitFee := btcutil.Amount((int64(feePerKw) * CommitWeight) / 1000)
 
 	fundingMSat := lnwire.NewMSatFromSatoshis(fundingAmt)
 	capacityMSat := lnwire.NewMSatFromSatoshis(capacity)

lnwallet/size.go

@@ -5,6 +5,15 @@ import (
 	"github.com/roasbeef/btcd/wire"
 )
 
+const (
+	// CommitWeight is the weight of the base commitment transaction which
+	// includes: one p2wsh input, out p2wkh output, and one p2wsh output.
+	CommitWeight int64 = 724
+
+	// HtlcWeight is the weight of an HTLC output.
+	HtlcWeight int64 = 172
+)
+
 const (
 	// witnessScaleFactor determines the level of "discount" witness data
 	// receives compared to "base" data. A scale factor of 4, denotes that

lnwallet/wallet.go

@@ -39,9 +39,6 @@ const (
 	// TODO(roasbeef): should instead be child to make room for future
 	// rotations, etc.
 	identityKeyIndex = hdkeychain.HardenedKeyStart + 2
-
-	commitWeight int64 = 724
-	htlcWeight   int64 = 172
 )
 
 var (