multi: add random coin selection

config.go

@@ -154,6 +154,10 @@ const (
 	// channel state updates that is accumulated before signing a new
 	// commitment.
 	defaultChannelCommitBatchSize = 10
+
+	// defaultCoinSelectionStrategy is the coin selection strategy that is
+	// used by default to fund transactions.
+	defaultCoinSelectionStrategy = "largest"
 )
 
 var (
@@ -297,6 +301,8 @@ type Config struct {
 
 	ResetWalletTransactions bool `long:"reset-wallet-transactions" description:"Removes all transaction history from the on-chain wallet on startup, forcing a full chain rescan starting at the wallet's birthday. Implements the same functionality as btcwallet's dropwtxmgr command. Should be set to false after successful execution to avoid rescanning on every restart of lnd."`
 
+	CoinSelectionStrategy string `long:"coin-selection-strategy" description:"The strategy to use for selecting coins for wallet transactions." choice:"largest" choice:"random"`
+
 	PaymentsExpirationGracePeriod time.Duration `long:"payments-expiration-grace-period" description:"A period to wait before force closing channels with outgoing htlcs that have timed-out and are a result of this node initiated payments."`
 	TrickleDelay                  int           `long:"trickledelay" description:"Time in milliseconds between each release of announcements to the network"`
 	ChanEnableTimeout             time.Duration `long:"chan-enable-timeout" description:"The duration that a peer connection must be stable before attempting to send a channel update to reenable or cancel a pending disables of the peer's channels on the network."`
@@ -547,6 +553,7 @@ func DefaultConfig() Config {
 		ActiveNetParams:         chainreg.BitcoinTestNetParams,
 		ChannelCommitInterval:   defaultChannelCommitInterval,
 		ChannelCommitBatchSize:  defaultChannelCommitBatchSize,
+		CoinSelectionStrategy:   defaultCoinSelectionStrategy,
 	}
 }