import logging import os import streamlit as st from twilio.rest import Client logger = logging.getLogger(__name__) @st.cache_data def get_ice_servers(): """Use Twilio's TURN server because Streamlit Community Cloud has changed its infrastructure and WebRTC connection cannot be established without TURN server now. # noqa: E501 We considered Open Relay Project (https://www.metered.ca/tools/openrelay/) too, but it is not stable and hardly works as some people reported like https://github.com/aiortc/aiortc/issues/832#issuecomment-1482420656 # noqa: E501 See https://github.com/whitphx/streamlit-webrtc/issues/1213 """ # Ref: https://www.twilio.com/docs/stun-turn/api try: account_sid = os.environ["TWILIO_ACCOUNT_SID"] auth_token = os.environ["TWILIO_AUTH_TOKEN"] except KeyError: logger.warning( "Twilio credentials are not set. Fallback to a free STUN server from Google." # noqa: E501 ) return [{"urls": ["stun:stun.l.google.com:19302"]}] client = Client(account_sid, auth_token) token = client.tokens.create() return token.ice_servers