Hono•2mo ago

Websockets connected clients count

Hi, I'd like to know how to get the amount of connected clients.

import { Hono } from 'hono'
import { upgradeWebSocket } from 'hono/cloudflare-workers'
const app = new Hono()
const obj = { data: 5 };

//i'm periodically changing the data in obj
function startTimer() {
    return setInterval(() => {
        obj.data = Math.random();
    }, 1000);
}

const wsApp = app.get(
    '/ws',
    upgradeWebSocket((c) => {
        let timer: NodeJS.Timeout;
        return {
            onOpen: (event, ws) => {
                console.log('connected');
                ws.send(JSON.stringify(obj));
                timer = startTimer();
            },
            onClose: (event, ws) => {
                //if no clients are connected stop the timer
                // if ( ws.clients.size === 0) {
                //     clearInterval(timer);
                // }
            }
        }
    })
)

export type WebSocketApp = typeof wsApp;

import { Hono } from 'hono'
import { upgradeWebSocket } from 'hono/cloudflare-workers'
const app = new Hono()
const obj = { data: 5 };

//i'm periodically changing the data in obj
function startTimer() {
    return setInterval(() => {
        obj.data = Math.random();
    }, 1000);
}

const wsApp = app.get(
    '/ws',
    upgradeWebSocket((c) => {
        let timer: NodeJS.Timeout;
        return {
            onOpen: (event, ws) => {
                console.log('connected');
                ws.send(JSON.stringify(obj));
                timer = startTimer();
            },
            onClose: (event, ws) => {
                //if no clients are connected stop the timer
                // if ( ws.clients.size === 0) {
                //     clearInterval(timer);
                // }
            }
        }
    })
)

export type WebSocketApp = typeof wsApp;

6 Replies

thai•2mo ago

Thank you for anyone's help in advance.

plumbe0•2mo ago

I believe you have to track them on your app side, it's not something that the protocol does automatically for you. Maybe use something like redis if your function is executed in serverless environments?

Aditya Mathur•2mo ago

If you were on a server, you could have created a global variable which increments and decrements on onOpen and onClose but for workers you will need to store this value on an external storage solutions like KV or DurableObject

blurSkye 🇵🇸🍉•2mo ago

unfortunately you will have manually keep track of it

thai•2mo ago

Thank you everyone for your help

blurSkye 🇵🇸🍉•2mo ago

add solved tag

Gaming

Programming

Websockets connected clients count