How do you close a websocket connection if the API page is invalid

Question

I am working with the Binance API. I am connecting to their API and trying to assess if Binance has a list of assets on their platform or not. The list of assets is seen below:

assets = ['tribe', 'pax']

I pass this through to their API by inserting the name of the assets into the SOCKET link:

SOCKET = f"wss://stream.binance.com:9443/ws/{asset}usdt@ticker"

I know the asset does exist on their website if on_message is called, because then I have accomplished a consistent connection with their API and it will keep printing messages unless I close the connection (which I do). However, if no message is received in n time I know they do not have the asset I am looking for. In this case Binance does have tribe, but not pax. I want to close the connection if the asset is not on their website after n time, how do I do this?

import ssl
import websocket

def on_open(ws):
    print('connection: successful')


def on_close(ws, *args):
    print('connection: lost')
    print("---------------------------------------------------")
    ws.close()


def on_message(ws, message):
    print("message received")
    print()
    ws.close()


def on_error(ws, message):
    print(message)
    print()


assets = ['tribe', 'pax']
for asset in assets:
    print(asset)
    SOCKET = f"wss://stream.binance.com:9443/ws/{asset}usdt@ticker"


    ws = websocket.WebSocketApp(SOCKET, on_open=on_open, on_close=on_close, on_message=on_message,
                                on_error=on_error)

    ws.run_forever(sslopt={"cert_reqs": ssl.CERT_NONE})

I have attempted to write:

if on_message == False:
    ws.close()

however this does not work because on_message is not even being called as far as my knowledge goes.

Here is the Binance API documentation: https://github.com/binance/binance-spot-api-docs/blob/master/web-socket-streams.md#klinecandlestick-streams Here is the websocket-client documentation: https://websocket-client.readthedocs.io/en/latest/examples.html

Answer 1

This is rough, but it works

import ssl
import websocket
import requests
import json
import pprint

def on_open(ws):
    print('connection: successful')


def on_close(ws, *args):
    print('connection: lost')
    print()
    ws.close()


def on_message(ws, message):
    json_message = json.loads(message)
    pprint.pprint(json_message)
    ws.close()


def on_error(ws, message):
    print("error")
    print()


assets = ['TRIBE', 'PAX', 'OGN', 'RAI', 'QNT', 'BTC']
for asset in assets:
    url = f"https://www.binance.com/en/trade/{asset}_USDT"
    soup = requests.get(url).text

    if "https://bin.bnbstatic.com/static/images/electron/404-error.png" in soup:
        print(f"{asset} not on coinbase")


    else:
        print(asset, "on coinbase")
        SOCKET = f"wss://stream.binance.com:9443/ws/{asset.lower()}usdt@ticker"
        print(SOCKET)

        ws = websocket.WebSocketApp(SOCKET, on_open=on_open, on_close=on_close, on_message=on_message, on_error=on_error)
        ws.run_forever(sslopt={"cert_reqs": ssl.CERT_NONE})

    print("------------------------------")
    print()

Also, this does not use the method you were thinking of but it does work like you want it too (I think).