cmd/loop: add macaroon params to CLI

cmd/loop/main.go

@@ -66,9 +66,9 @@ var (
 		Value: loopd.DefaultTLSCertPath,
 	}
 	macaroonPathFlag = cli.StringFlag{
-		Name: "macaroonpath",
-		Usage: "path to macaroon file, only needed if loop runs " +
-			"in the same process as lnd",
+		Name:  "macaroonpath",
+		Usage: "path to macaroon file",
+		Value: loopd.DefaultMacaroonPath,
 	}
 )
 
@@ -171,25 +171,31 @@ func extractPathArgs(ctx *cli.Context) (string, string, error) {
 	}
 
 	// We'll now fetch the loopdir so we can make a decision on how to
-	// properly read the cert. This will either be the default, or will have
-	// been overwritten by the end user.
+	// properly read the macaroons and also the cert. This will either be
+	// the default, or will have been overwritten by the end user.
 	loopDir := lncfg.CleanAndExpandPath(ctx.GlobalString(loopDirFlag.Name))
 	tlsCertPath := lncfg.CleanAndExpandPath(ctx.GlobalString(
 		tlsCertFlag.Name,
 	))
+	macPath := lncfg.CleanAndExpandPath(ctx.GlobalString(
+		macaroonPathFlag.Name,
+	))
 
-	// If a custom lnd directory was set, we'll also check if custom paths
-	// for the TLS cert file were set as well. If not, we'll override their
-	// paths so they can be found within the custom loop directory set. This
-	// allows us to set a custom lnd directory, along with custom paths to
-	// the TLS cert file.
+	// If a custom loop directory was set, we'll also check if custom paths
+	// for the TLS cert and macaroon file were set as well. If not, we'll
+	// override their paths so they can be found within the custom loop
+	// directory set. This allows us to set a custom loop directory, along
+	// with custom paths to the TLS cert and macaroon file.
 	if loopDir != loopd.LoopDirBase || networkStr != loopd.DefaultNetwork {
 		tlsCertPath = filepath.Join(
 			loopDir, networkStr, loopd.DefaultTLSCertFilename,
 		)
+		macPath = filepath.Join(
+			loopDir, networkStr, loopd.DefaultMacaroonFilename,
+		)
 	}
 
-	return tlsCertPath, ctx.GlobalString(macaroonPathFlag.Name), nil
+	return tlsCertPath, macPath, nil
 }
 
 type inLimits struct {
@@ -373,8 +379,15 @@ func logSwap(swap *looprpc.SwapStatus) {
 func getClientConn(address, tlsCertPath, macaroonPath string) (*grpc.ClientConn,
 	error) {
 
+	// We always need to send a macaroon.
+	macOption, err := readMacaroon(macaroonPath)
+	if err != nil {
+		return nil, err
+	}
+
 	opts := []grpc.DialOption{
 		grpc.WithDefaultCallOptions(maxMsgRecvSize),
+		macOption,
 	}
 
 	// TLS cannot be disabled, we'll always have a cert file to read.
@@ -383,15 +396,6 @@ func getClientConn(address, tlsCertPath, macaroonPath string) (*grpc.ClientConn,
 		return nil, err
 	}
 
-	// Macaroons are not yet enabled by default.
-	if macaroonPath != "" {
-		macOption, err := readMacaroon(macaroonPath)
-		if err != nil {
-			return nil, err
-		}
-		opts = append(opts, macOption)
-	}
-
 	opts = append(opts, grpc.WithTransportCredentials(creds))
 
 	conn, err := grpc.Dial(address, opts...)