With the following code i open a stream connection to the Binance crypto exchange:
let adress = 'wss://stream.binance.com:9443/ws/btcusdt@kline_1h';
const ws = new WebSocket(adress);
If i make this call for different crypto currencys then i have later a few streams open, i want to know how can i check the current open streams, is there something like a function or parameter where i can see for which currencys i have a open stream running?
because i also have the problem that it looks like streams are stopping sometimes and i dont have a good solution for checking which streams have stop and how to receonnect them. My idea is now to first find a way how to check which streams are running and then maybe if one streams is stop i will just send the connection request again.
In javascript there is a websocket events thing, so all you need is to
ws.onclose = function(event) {
ws = new WebSocket(adress);
//just reopen it
};
Or, for more safety, you can
ws.onclose = function(event) {
if (event.wasClean) {
ws = new WebSocket(adress);
} else {
console.log('Connection error!');
//or whatever u want
}
};
Sorry for this stupid styling, I'm newbie there
If you want to receive push messages from the server, you need to keep the ws connection open. If not, you can close the ws after a query and reopen it then for another query. You should wait for the closed state ws.readyState === 3 before reopening.
If you need to keep all ws connections open, then you need a list of ws Objects. You push new objects to the list:
let ws_list = [] // global list of ws objects
let create_connection = function(url){
try{
ws_list.push(new WebSocket(url));
} catch(err){
console.log(err, url);
}
}
let do_something = function(){
for(let ws of ws_list){
// do something with the ws object
}
}