Flask-socketio: Attach data file during emiting

[Nixellion]

Hello, I wonder if it is somehow possible to emit some file\data from the JS client to the Flask-SocketIO server?

I need to send audio data recorded from the browser along with some other regular text\json data.

It is possible with socketio? How should I approach it? Or should I rely on ajax and post stuff rather?
Thanks!

[miguelgrinberg]

You can send binary data, that's supported. Even more, you can combine binary and JSON data in one message. So for example, you could send something like this:

socket.emit('recording', {'audio_data': binary_data, 'metadata': {'channels': 2, 'rate': 44100}});

For the server, I recommend you use Python 3, as that will make it easier to work with and differentiating between binary and text data.

[Nixellion]

But, just worth mentioning, it looks like there's a limit to how much data you can send with one emit, so large files should be split into multiple chunks. I'm not entirely sure about this, though