How to track upload progress?

[wuyuanyi135]

Hello, I have read the documentation about how to track the progress of downloading. I want to implement a similar functionality for post uploading. However, the following code did not track the progress in realtime. Instead, it finishes much faster than the actual uploading. I suspect that the library will try to read and cache the data from the io so I could not get the real upload progress. Can you suggest a proper way to implment this functionality? Thanks!

    content = firmware.read()
    firmware_size = len(content)

    class ProgressMemoryReader(BytesIO):
        def __init__(self, data, read_callback=None):
            super().__init__(data)
            self.read_callback = read_callback
            self.length = len(data)

        def read(self, size=None):
            if self.read_callback:
                self.read_callback(self.tell(), self.length)
            return super(ProgressMemoryReader, self).read(size)

    client.post(
        "/ota",
        content=ProgressMemoryReader(content, progress_callback),
        headers={'Content-Type': 'application/octet-stream'}
    )