sockserv.py

#!/usr/bin/env python

# https://websockets.readthedocs.io/en/stable/intro.html#browser-based-example

# simple slider example with socket server

import asyncio

import json

import websockets

async def receiver(websocket, path):

    try:

        message=await websocket.recv()

        async for message in websocket:

            data = json.loads(message)

            if data["action"] == "slider1":

                print('slider received')

                print(data)

                val=data['value']

                msg2browser = json.dumps({"type": "slider1", "value": val})

                await websocket.send(msg2browser)

            else:

                logging.error("unsupported event: %s", data)

    finally:

      print("error: nothing received")

start_server = websockets.serve(receiver, "localhost", 6789)

asyncio.get_event_loop().run_until_complete(start_server)

asyncio.get_event_loop().run_forever()