mod+chanfunding: use coin selection strategy for channel funding

The wallet assembler is now aware of the node config level coin
selection strategy, so we can use it when creating new channels.

lnwallet/chanfunding/wallet_assembler.go

@@ -31,7 +31,7 @@ type FullIntent struct {
 
 	// InputCoins are the set of coins selected as inputs to this funding
 	// transaction.
-	InputCoins []Coin
+	InputCoins []wallet.Coin
 
 	// ChangeOutputs are the set of outputs that the Assembler will use as
 	// change from the main funding transaction.
@@ -268,12 +268,12 @@ func (w *WalletAssembler) ProvisionChannel(r *Request) (Intent, error) {
 		var (
 			// allCoins refers to the entirety of coins in our
 			// wallet that are available for funding a channel.
-			allCoins []Coin
+			allCoins []wallet.Coin
 
 			// manuallySelectedCoins refers to the client-side
 			// selected coins that should be considered available
 			// for funding a channel.
-			manuallySelectedCoins []Coin
+			manuallySelectedCoins []wallet.Coin
 			err                   error
 		)
 
@@ -309,8 +309,8 @@ func (w *WalletAssembler) ProvisionChannel(r *Request) (Intent, error) {
 		}
 
 		var (
-			coins                []Coin
-			selectedCoins        []Coin
+			coins                []wallet.Coin
+			selectedCoins        []wallet.Coin
 			localContributionAmt btcutil.Amount
 			changeAmt            btcutil.Amount
 		)
@@ -357,7 +357,9 @@ func (w *WalletAssembler) ProvisionChannel(r *Request) (Intent, error) {
 			// enough funds in the wallet to cover for a reserve.
 			reserve := r.WalletReserve
 			if len(manuallySelectedCoins) > 0 {
-				sumCoins := func(coins []Coin) btcutil.Amount {
+				sumCoins := func(
+					coins []wallet.Coin) btcutil.Amount {
+
 					var sum btcutil.Amount
 					for _, coin := range coins {
 						sum += btcutil.Amount(
@@ -390,6 +392,7 @@ func (w *WalletAssembler) ProvisionChannel(r *Request) (Intent, error) {
 				err = CoinSelectUpToAmount(
 				r.FeeRate, r.MinFundAmt, r.FundUpToMaxAmt,
 				reserve, w.cfg.DustLimit, coins,
+				w.cfg.CoinSelectionStrategy,
 			)
 			if err != nil {
 				return err
@@ -423,6 +426,7 @@ func (w *WalletAssembler) ProvisionChannel(r *Request) (Intent, error) {
 			selectedCoins, localContributionAmt, changeAmt,
 				err = CoinSelectSubtractFees(
 				r.FeeRate, r.LocalAmt, dustLimit, coins,
+				w.cfg.CoinSelectionStrategy,
 			)
 			if err != nil {
 				return err
@@ -435,6 +439,7 @@ func (w *WalletAssembler) ProvisionChannel(r *Request) (Intent, error) {
 			localContributionAmt = r.LocalAmt
 			selectedCoins, changeAmt, err = CoinSelect(
 				r.FeeRate, r.LocalAmt, dustLimit, coins,
+				w.cfg.CoinSelectionStrategy,
 			)
 			if err != nil {
 				return err
@@ -507,9 +512,10 @@ func (w *WalletAssembler) ProvisionChannel(r *Request) (Intent, error) {
 // outpointsToCoins maps outpoints to coins in our wallet iff these coins are
 // existent and returns an error otherwise.
 func outpointsToCoins(outpoints []wire.OutPoint,
-	coinFromOutPoint func(wire.OutPoint) (*Coin, error)) ([]Coin, error) {
+	coinFromOutPoint func(wire.OutPoint) (*wallet.Coin, error)) (
+	[]wallet.Coin, error) {
 
-	var selectedCoins []Coin
+	var selectedCoins []wallet.Coin
 	for _, outpoint := range outpoints {
 		coin, err := coinFromOutPoint(
 			outpoint,