How to avoid executing same shell command multiple times in NodeJS? - node.js

Question

I have module which executes a shell command when user clicks submit on the UI,but the problem here is that at the time of clicking submit command:
number of times command executed= number of tabs that this UI is being opened while clicking submit button
Server side code:
const wsServer = new WebSocket.Server({
noServer: true,
});
wsServer.on("connection", function (ws) {
ws.on("message", function (msg) {
wsServer.clients.forEach(function each(client) {
if (client.readyState === WebSocket.OPEN) {
var coffeeProcess = exec(msg.toString());
coffeeProcess.stdout.on("data", function (data) {
console.log(data);
client.send(data);
});
}
});
});
});
myServer.on("upgrade", async function upgrade(request, socket, head) {
//handling upgrade(http to websocekt) event
//emit connection when request accepted
wsServer.handleUpgrade(request, socket, head, function done(ws) {
wsServer.emit("connection", ws, request);
});
});
Client side code:
//Creating DOM element to show received messages on browser page
function msgGeneration(msg, from) {
console.log("msg:" + msg + "-from:" + from);
}
//enabling send message when connection is open
mywsServer.onopen = function () {
console.log("Socket Connection Established");
};
//handling message event
mywsServer.onmessage = function (event) {
const { data } = event;
console.log("Message Event", data);
results.push(data);
result.innerText+=results.slice(-1)[0]
};
Hiding the details that has info here in the client side
I am very new to this :
I learned javascript sessions would be helpful here