chore: return error from WriteGRPCMessage

cmd/fauxrpc/cmd_generate.go

@@ -78,7 +78,9 @@ func (c *GenerateCmd) Run(globals *Globals) error {
 		if err != nil {
 			return err
 		}
-		grpc.WriteGRPCMessage(os.Stdout, protoBytes)
+		if err := grpc.WriteGRPCMessage(os.Stdout, protoBytes); err != nil {
+			return err
+		}
 	default:
 		return fmt.Errorf("unexpected format: %s", c.Format)
 	}

private/grpc/encoding.go

@@ -6,11 +6,16 @@ import (
 	"io"
 )
 
-func WriteGRPCMessage(w io.Writer, msg []byte) {
+func WriteGRPCMessage(w io.Writer, msg []byte) error {
 	prefix := make([]byte, 5)
 	binary.BigEndian.PutUint32(prefix[1:], uint32(len(msg)))
-	_, _ = w.Write(prefix)
-	_, _ = w.Write(msg)
+	if _, err := w.Write(prefix); err != nil {
+		return err
+	}
+	if _, err := w.Write(msg); err != nil {
+		return err
+	}
+	return nil
 }
 
 func ReadGRPCMessage(body io.Reader, msg []byte) (int, error) {

private/server/handler.go

@@ -137,7 +137,7 @@ func NewHandler(service protoreflect.ServiceDescriptor, db stubs.StubDatabase, v
 				return
 			}
 		}
-		grpc.WriteGRPCMessage(w, msg)
+		_ = grpc.WriteGRPCMessage(w, msg)
 		grpcWriteStatus(w, status.New(codes.OK, ""))
 	})
 }