static Throwable tryUnwrapThrowable()

in ratis-grpc/src/main/java/org/apache/ratis/grpc/GrpcUtil.java [100:134]

32 lines of code
9 McCabe index (conditional complexity)


  static Throwable tryUnwrapThrowable(StatusRuntimeException se) {
    final Status status = se.getStatus();
    if (status != null && status.getCode() == Status.Code.DEADLINE_EXCEEDED) {
      return new TimeoutIOException(status.getDescription(), se);
    }

    final Metadata trailers = se.getTrailers();
    if (trailers == null) {
      return null;
    }

    final byte[] bytes = trailers.get(EXCEPTION_OBJECT_KEY);
    if (bytes != null) {
      try {
        return IOUtils.bytes2Object(bytes, Throwable.class);
      } catch (Exception e) {
        se.addSuppressed(e);
      }
    }

    if (status != null) {
      final String className = trailers.get(EXCEPTION_TYPE_KEY);
      if (className != null) {
        try {
          final Class<? extends Throwable> clazz = Class.forName(className).asSubclass(Throwable.class);
          final Throwable unwrapped = ReflectionUtils.instantiateException(clazz, status.getDescription());
          return unwrapped.initCause(se);
        } catch (Throwable e) {
          se.addSuppressed(e);
          return new IOException(se);
        }
      }
    }
    return null;
  }