finalize method

@override ByteStream finalize()

Freezes all mutable fields and returns a single-subscription ByteStream that will emit the request body.

Implementation

@override
http.ByteStream finalize() {
  final byteStream = super.finalize();
  if (onUploadProgress == null) return byteStream;

  final total = contentLength;
  int bytes = 0;

  final t = StreamTransformer.fromHandlers(
    handleData: (List<int> data, EventSink<List<int>> sink) {
      bytes += data.length;
      onUploadProgress!(
        UploadEvent(
          total: total,
          uploaded: bytes,
          percent: ((bytes / total) * 100).round(),
        ),
      );
      if (total >= bytes) {
        sink.add(data);
      }
    },
  );

  final stream = byteStream.transform(t);
  return http.ByteStream(stream);
}