Function for select node

function checkWorkingNode() {
    const NODES = [
        "wss://golos.lexa.host/ws",
        "wss://api.golos.blckchnd.com/ws"
    ];
    let node = localStorage.getItem("node") || NODES[0];
    const idx = Math.max(NODES.indexOf(node), 0);
    let checked = 0;
    const find = (idx) => {
        if (idx >= NODES.length) {
            idx = 0;
        }
        if (checked >= NODES.length) {
            alert("no working nodes found");
            return;
        }
        node = NODES[idx];
        console.log("check", idx, node);
        golos.config.set("websocket", node);
        try {
            golos.api.stop();
        } catch(e) {
        }

        let timeout = false;
        let timer = setTimeout(() => {
            console.log("timeout", NODES[idx])
            timeout = true;
            find(idx + 1);
        }, 3000);
        golos.api.getDynamicGlobalPropertiesAsync()
            .then(props => {
                if(!timeout) {
                    check = props.head_block_number;
                    console.log("found working node", node);
                    localStorage.setItem("node", node);
                    clearTimeout(timer);
                }
            })
            .catch(e => {
                console.log("connection error", node, e);
                find(idx + 1);
            });
    }
    find(idx);
}
checkWorkingNode();