transform a byte array to a readablestream

Question

Hi I am stuck on this issue,

I reconstructed a few protobuf object in order to seed data to my miragejs instance,

  const unknownObject = new core.UnknownObject()
  const unknownEntity = new message.UnknownObjectEntity()
  const unknownEntityRepo = new message.UnknownObjectEntityRepository()
  const unknownObjectNotification = new message.UnknownObjectNotification()

  const date = new google_protobuf_timestamp_pb.Timestamp()

  unknownObject.setImage(Base64())
  unknownObject.setTimestamp(date)
  unknownObject.setWaypoint(new core.Waypoint())

  console.log('unknownObject:', unknownObject.getTimestamp())

  unknownEntity.setId('1')
  unknownEntity.setUnknownobject(unknownObject)

  console.log('unknownEntity:', unknownEntity)

  const endBuffer = unknownEntityRepo.addEntity(unknownEntity).serializeBinary()

the end result (endBuffer) is a byte array. I want to reconstruct this byte array into a readablestream in order to seed the data. This is the final result needed.

ReadableStream {locked: false}

I can only fund resources made to be used to read the stream but never the transform a byte array into the ReadableStream.

Does anyone have experience with this. Thanks

jt. · Accepted Answer · 2022-09-14 16:17:41Z

4

You need to implement ReadableStream and add your content to the controller. Mozilla's MDN Web Docs provide some guidance in their simple random string example.

Here is a simplified example:

function buildStream(data)
{
    //depending on what data is and how it will be used, you may need to convert it
    //data = Uint8Array.from(data);
    
    return new ReadableStream({
        start(controller) {
            // Add the data to the stream
            controller.enqueue(data);
        },
        pull(controller) {
            // nothing left to pull, so close
            controller.close();
        },
        cancel() {
            //nothing to do
        }
    });
}

edited Sep 14, 2022 at 16:17

answered Oct 8, 2021 at 19:16

jt.

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