rpc: SendOutputs considers anchor reserve

lnrpc/walletrpc/errors.go

@@ -0,0 +1,17 @@
+package walletrpc
+
+import "errors"
+
+var (
+
+	// ErrZeroLabel is returned when an attempt is made to label a
+	// transaction with an empty label.
+	ErrZeroLabel = errors.New("cannot label transaction with empty " +
+		"label")
+
+	// ErrInsufficientReserve is returned when SendOutputs wouldn't leave
+	// enough funds in the wallet to cover for the anchor reserve.
+	ErrInsufficientReserve = errors.New("the outputs to be sent " +
+		"would leave insufficient reserves for anchor channels in " +
+		"the wallet")
+)