A repo tryna see if you could run a streamlit app on mybinder

Inspired by this thread: https://discuss.streamlit.io/t/jupyterhub-streamlit/1238/5

It finally worked when github user op07n forked and fixed streamlit_call.py

3 files:

• requirements.txt or evironment.yml with
  • nbserverproxy
  • streamlit
  • jupyter-server-proxy
• a jupyter server extension script:
  • Here we called it streamlit_call.py and it's fairly simple

  from subprocess import Popen
  
  def load_jupyter_server_extension(nbapp):
      """serve the streamlit app"""
      Popen(["streamlit", "hello", "--browser.serverAddress=0.0.0.0", "--server.enableCORS=False"])

• postBuild which enables nbserverproxy, moves the extension script and enables it

    # enable nbserverproxy
    jupyter serverextension enable --sys-prefix nbserverproxy
    # streamlit launches at startup
    mv .binder/streamlit_call.py ${NB_PYTHON_PREFIX}/lib/python*/site-packages/
    # enable streamlit extension
    jupyter serverextension enable --sys-prefix streamlit_call

To open by default you'd add ?urlpath=proxy/8501/ to the end of your mybinder link. For example, this repo's link is https://mybinder.org/v2/gh/chekos/testing-streamlit-mybinder/master?urlpath=proxy/8501/